CN115366352B - Automatic demoulding mould for internal and external threads - Google Patents

Abstract

The invention discloses an automatic demolding die for internal and external threads, which comprises a fixed die part and a movable die part which can be mutually matched, and a cutting rotation stopping mechanism and a tooth twisting mechanism for demolding products; the die assembly of the fixed die part and the movable die part is firstly carried out so that two half sliders are combined to form a die cavity, then injection molding is carried out, a product is molded, then the die is opened again, demoulding of an external thread part of the product is completed after preliminary die opening, the product is cut and stopped by the external cutting rotation stopping mechanisms on two sides, and then the external tooth twisting mechanisms are driven so that the tooth twisting mechanisms drive the movable die core to rotate, so that tooth twisting withdrawing is realized, demoulding of an internal thread part of the product is realized, full-automatic operation of the whole process is carried out, the production efficiency can be effectively improved, and the reject ratio of the product is reduced.

Description

Automatic demoulding mould for internal and external threads

Technical Field

The invention relates to an injection mold, in particular to an automatic demolding mold for internal and external threads.

Background

At present, an injection mold is a tool matched with a plastic molding machine in the plastic processing industry to endow a plastic product with complete configuration and accurate size. At present, the injection mold for screw parts in China adopts threaded mold cores to cast and mold, when demolding, products are cut off by an external cutter, and the products are subjected to rotation-stopping rotary mold core release, but the mold is usually only in a semi-automatic production mode, and the rotation stopping position of the products is insufficient easily, so that the mold can not realize the inner cutting of the mold when the mold is in a mold release mode, the mold release efficiency of the mold can not be effectively improved, the production progress is influenced, and the semi-automatic mode easily causes the mold release effect of the products to be poor and the reject ratio to be higher.

Disclosure of Invention

The invention provides an automatic demolding die for internal and external threads, which is externally arranged for rotation stopping and positioning and compatible with a die inscription structure under the condition of insufficient rotation stopping of products, realizes full-automatic production of the products, can effectively improve the production efficiency, reduces the reject ratio of the products, and has important guiding significance for realizing die inscription of twisted tooth products and dies.

The technical scheme of the invention is as follows:

an automatic demolding die for internal and external threads comprises a fixed die part and a movable die part which can be mutually matched, and a cutting rotation stopping mechanism and a tooth twisting mechanism for demolding products;

the fixed die part comprises a fixed die panel and a fixed die plate fixed at the bottom of the fixed die panel, the fixed die plate is provided with a mounting groove, two half sliding blocks which are symmetrically arranged are arranged in the mounting groove, two half sliding blocks are respectively provided with a half die cavity and a half die runner which is communicated with the half die cavities, internal threads are arranged on the inner side walls of the half die cavities, the half die cavities and the half die runners of the two half sliding blocks are oppositely arranged, the two half sliding blocks slide along a sliding block guide bar at one side of the mounting groove so that the two half die cavities which are oppositely arranged are matched or opened, and at the moment, the two half die runners which are oppositely arranged are also combined to form a main runner for injection molding or separation and stripping; the top of the fixed die panel is provided with a sprue communicated with the main runner, the bottom of the fixed die panel is fixedly provided with a fixed die core, the fixed die core is arranged between two half die cavities which are oppositely arranged by the half sliders, the bottom of the fixed die panel is provided with a holding needle, the holding needle penetrates out of an inclined guide hole of the half sliders, and a fixed die spring is arranged in the inclined guide hole and sleeved on the holding needle;

The movable mould part comprises a push plate, a movable mould plate, vertical plates and a base, wherein the vertical plates are respectively fixed on two sides of the base, a hollow installation space is formed between the two vertical plates, the tops of the two vertical plates are respectively and fixedly connected with two sides of the bottom of the movable mould plate, the movable mould plate is provided with a floating structure, and the push plate is installed on the top of the movable mould plate through the floating structure; the movable mold plate is provided with a movable mold core, an external thread is arranged at the outer side of an inserting end of the movable mold core, the movable mold core penetrates out of the movable mold plate through bearing installation, the inserting end penetrates out of a mold core sleeve fixed on the push plate and is provided with an inserting port for matching and inserting with the fixed mold core, so that two half mold cavities form a mold cavity when mold closing is realized, and the other end penetrates out of the bottom of the movable mold plate, is arranged in the installation space and is sleeved with a first transmission gear; the pushing plate is provided with a needle holding groove, and when the die is closed, the tail end of the needle holding groove is inserted into the needle holding groove so that the fixed die spring is compressed;

the cutting rotation stopping mechanism comprises a cutting assembly and rotation stopping assemblies symmetrically arranged on two sides of the push plate, the rotation stopping assemblies comprise a mounting plate, a hydraulic cylinder, guide rails and push blocks, the mounting plate is fixed on one side of the push plate, the hydraulic cylinder is arranged on the mounting plate and used for driving the push blocks to slide along the guide rails, the guide rails are arranged on the push plate, the fixed die plate is provided with notches for accommodating the guide rails, the tail ends of the push blocks are provided with rotation stopping positioning openings, the cutting assembly is arranged at the tail ends of one of the push blocks of the rotation stopping assemblies, and the cutting assembly comprises a cutter seat fixed at the tail ends of the push blocks and blades arranged on two sides of the cutter seat; after the die is opened, the rotation stopping positioning ports of the two rotation stopping assemblies are used for stopping rotation and propping up the product from two sides respectively, and meanwhile, the blade cuts off the connection between the product and the pouring gate;

The tooth twisting mechanism comprises a main transmission shaft and a hydraulic motor, the main transmission shaft is rotatably installed in the installation space, a second transmission gear is sleeved at the top of the main transmission shaft and meshed with the first transmission gear, a third transmission gear is sleeved at the bottom of the main transmission shaft and is in transmission with an output gear of the hydraulic motor, and the hydraulic motor is installed on one side of the base.

The application process of the invention is as follows:

when the mold is closed, the injection molding machine drives the fixed mold plate to be close to the push plate downwards, at the moment, the tail ends of the holding pins of the two half slide blocks start to be inserted into the holding pin grooves of the push plate, in the downward process of the fixed mold plate, due to the action of the inclined holding pins, the two half slide blocks gradually approach to the inner side of the mounting groove along the slide block guide bar, at the moment, the fixed mold spring is gradually compressed, meanwhile, the floating structure at the bottom of the push plate is compressed, when the fixed mold plate is completely attached to the push plate, the two half slide blocks are combined together, corresponding half mold cavities and half mold flow channels in the two half slide blocks are combined to form a mold cavity and a main flow channel, at the moment, the fixed mold cores are synchronously inserted into the insertion ports of the movable mold cores, and are placed in the mold cavity to complete the mold closing, and then the injection molding machine performs injection molding on the main flow channels through the sprue to enable the sol to flow into the mold cavity to be injection molded; the inner side wall of the half-mold cavity is provided with an inner thread, and the outer side of the plug-in end of the movable mold core is provided with an outer thread, so that after the mold is closed, the inner and outer walls formed in the cavity are provided with the inner and outer threads, so that a product is injection molded into a threaded piece with the inner and outer threads;

After the die assembly is completed, the die opening is needed, during the die opening, the injection molding machine drives the fixed die plate to be separated upwards, at the moment, the tail ends of the holding pins of the two half sliders start to be separated from the holding pin grooves of the push plate, in the upward process of the fixed die plate, due to the reset action of the fixed die springs, the two half sliders are pushed to be separated from each other gradually towards the outer side of the mounting groove along the slider guide bar, at the moment, the floating structure at the bottom of the push plate is not compressed any more, the push plate is pushed to slowly push out the product upwards, when the half sliders slide outwards to a limiting position, at the moment, the holding pins are completely separated from the holding pin grooves, and meanwhile, the fixed die core is synchronously separated from the inserting port of the movable die core, so that the die opening is completed, and the demoulding of the external thread forming part of the product is realized; then the injection molding machine continues to drive the fixed template to reset the fixed mold part;

after the die opening is completed, cutting, rotation stopping and die stripping are required, during die stripping, the hydraulic cylinders on two sides are driven, so that the two hydraulic cylinders respectively drive the two pushing blocks to approach the product along the guide rail until rotation stopping positioning ports at the tail ends of the two pushing blocks clamp rotation stopping ribs on two sides of the product, the driving of the hydraulic cylinders is stopped, meanwhile, the connection between the product and the pouring gate is cut off by blades at the tail ends of the pushing blocks, and the product is stopped and tightly pressed when the product is cut off; then controlling a hydraulic motor through an injection molding machine, enabling the hydraulic motor to drive through an output gear and a third drive gear, further enabling a main transmission shaft to drive a first drive gear to rotate through a second drive gear, enabling a movable mold core to synchronously rotate, enabling the movable mold core to rotate relative to a product, enabling a pushing plate to float towards the axis direction of the movable mold core under the action force of a floating structure while enabling the teeth to be twisted, further continuously pushing the bottom of the product, enabling the movable mold core to continuously rotate until the product is separated from the movable mold core, enabling an internal thread forming part of the product to achieve demolding, and enabling the tooth-twisting demolding action to be completed, so that the product can be taken out;

After demoulding is completed, the hydraulic cylinder is driven to reset the pushing block, and meanwhile, the hydraulic motor is also reversed to reset the movable mould core.

Further, the mold is also provided with an ejection mechanism, wherein the ejection mechanism comprises a thimble, a thimble panel, a thimble bottom plate, a thimble column, a needle return spring and a needle return guide column;

the thimble panel is fixedly laminated on the thimble bottom plate, and the thimble bottom plate is arranged at the bottom of the installation space; the bottom end of the return pin guide post is fixed on the thimble panel, and the top end of the return pin guide post sequentially and movably passes through the movable template and the push plate upwards through the through hole and is leveled with the surface of the push plate; the return needle spring is arranged in the installation space and sleeved on the return needle guide post, one end of the return needle spring is connected with the thimble panel, and the other end of the return needle spring is connected with the bottom of the movable mould plate; the bottom of the thimble is fixed on the thimble panel, and when the mold is closed, the top of the thimble sequentially and upwards penetrates through the movable template and the push plate to extend into the fixed template to correspond to a cold material well of the main runner; the ejector pin is fixed at the bottom of the ejector pin bottom plate and is movably arranged in the through hole of the base.

After the product breaks away from the movable mould core, the cold material in the main runner needs to be ejected, at the moment, the ejector pin is ejected by the ejector roller of the injection molding machine, the ejector pin is ejected upwards in the through hole of the base, and then the ejector pin bottom plate at the top is driven to eject upwards, so that the ejector pin on the ejector pin panel ejects the cold material well of the main runner upwards, at the moment, the ejector pin spring is pushed upwards by the ejector pin panel to compress, and after ejection, the ejector pin panel resets downwards under the action of the ejector pin spring, and then the ejector pin is reset. Because the spring has long service life, the elasticity of the spring can be changed, and a gap of a few millimeters can exist between the thimble bottom plate and the base during resetting, the top of the needle return guide post can be forced by a human hand at the moment, so that the needle return guide post can be ensured to push the thimble bottom plate to return to the position.

Further, an ejection limit column is fixed on the thimble panel. When the ejector pin is ejected upwards, the ejection limiting column is used for limiting the upward ejection height of the ejector pin so as not to excessively compress the return pin spring, and meanwhile, the distance between the ejection limiting column and the bottom of the movable mould plate is ensured to be larger than the distance for ejecting the cold material of the main runner by upward movement of the ejector pin so as to ensure that the ejector pin can eject the cold material smoothly.

Further, the mold is also provided with an air cooling mechanism, wherein the air cooling mechanism comprises an air pipe, a high-speed rotary air tap, a unidirectional mechanical air valve and an air valve contact block;

one end of the air pipe is communicated with an air source through the one-way mechanical air valve, the other end of the air pipe is connected with the high-speed rotary air tap, the high-speed rotary air tap is arranged in the installation space and is arranged at the bottom of the movable mould core, an air passage is formed in the movable mould core and is communicated with the high-speed rotary air tap, the top of the air passage is communicated with the inserting port, when the mould is closed, the fixed mould core is inserted into the inserting port and forms a first flow gap with the inserting port, air outlet holes communicated with the first flow gap are formed in two sides of the movable mould core, a second flow gap is formed between the movable mould core and the core sleeve, the air outlet holes are communicated with the second flow gap, a third flow gap communicated with the outside is formed between the top of the movable mould core and the bottom of the push plate, and the second flow gap is communicated with the third flow gap, so that the air flow is discharged to the outside through the third flow gap;

the one-way mechanical air valve is fixed on one side of the movable template, and the air valve contact block is fixed on one side of the fixed template and used for controlling the one-way mechanical air valve to be opened and closed in a contact mode.

When the product is subjected to die assembly and injection molding, the mold core needs to be cooled, and as the top end of the movable mold core and the tail end of the fixed mold core adopt a deepened and enlarged positioning inserting mode, the cooling of the fixed mold core is fully utilized to take away the heat of the movable mold core in the injection molding process, and meanwhile, the movable mold core can be rapidly cooled through cooling gas, so that the cooling effect is improved, and the product molding is accelerated.

The specific cooling process is as follows:

when the mold is closed, the fixed mold core is inserted into the insertion port of the movable mold core, cooling water is continuously introduced into the fixed mold core through a pipeline to cool the fixed mold core, at the moment, the cooling of the fixed mold core is fully utilized to take away heat of the movable mold core in the injection molding process, meanwhile, the air valve contact block is contacted with the unidirectional mechanical air valve during the mold closing, the air valve is opened, the air pipe sprays cooling gas into the air passage of the movable mold core through the high-speed rotary air tap to rapidly take away heat of the movable mold core, the cooling gas continuously flows into the insertion port along the air passage, flows to the air outlet through the first flow gap, further, the fixed mold core and the insertion part of the movable mold core are cooled, then the gas flows to the second flow gap through the air outlet, flows to the third flow gap through the second flow gap, and finally is discharged to the outside through the third flow gap.

When the product is opened, the air valve contact block is separated from contact with the unidirectional mechanical air valve, and at the moment, the air valve is closed, and air is not introduced for cooling. The invention realizes the functions of mold closing and ventilation and mold opening and closing and effectively improves the cooling efficiency of the movable mold core during mold closing.

The fixed mold core, the half slide block, the push plate and the movable mold plate are provided with the circulating cooling pipelines communicated with the outside, which is a water cooling means commonly used by a person skilled in the art and belongs to the known technology and is not described herein. The gas cooling is carried out, meanwhile, all the parts are always cooled through a circulating cooling pipeline, and the gas mechanism is additionally arranged to accelerate the cooling process and improve the cooling efficiency of the movable mold core.

Further, the top of movable mould board is formed with amortization air tank, amortization air tank is rectangular pulse form, and during the compound die, floating structure is compressed, so that the push pedal is closely in the top of movable mould board, at this moment amortization air tank be in the push pedal with the movable mould board between form the third flow clearance.

The cooling air inlet of the movable mould core is arranged at the tail part of the mould core and is connected by the high-speed rotary air tap, but the outlet of the third flowing clearance cannot be connected by the air tap, so the invention can effectively buffer high-speed air flow and noise when compressed air is discharged and reduce noise pollution of workshops by milling the silencing air groove on the movable mould plate and processing the silencing air groove into a rectangular pulse-shaped groove capable of slowing down air flow.

Further, the floating structure comprises a limiting equal-height screw and a floating spring, a spring groove and a limiting groove are arranged in the movable mould plate, a through hole is formed between the spring groove and the limiting groove, the limiting end of the limiting equal-height screw is arranged in the limiting groove, the other end of the limiting equal-height screw penetrates out of the limiting groove through the through hole and is arranged in the spring groove, the top of the limiting groove is fixedly connected with the bottom of the push plate, the floating spring is arranged in the spring groove and is sleeved on the limiting equal-height screw, one end of the floating spring is connected with the bottom of the push plate, and the other end of the floating spring is connected with the bottom of the spring groove.

When the die is closed, the fixed die plate presses the push plate downwards so as to enable the push plate to be tightly attached to the movable die plate, and at the moment, the floating spring is compressed in the spring groove; when the die is opened, the fixed die plate does not compress the push plate, the push plate floats towards the axis direction of the movable die core under the action of the floating spring due to the reset action of the floating spring, and after the push plate floats for a certain distance, the push plate does not float upwards due to the limiting action of the limiting groove on the limiting equal-height screws. Because the core sleeve is fixed on the push plate, the core sleeve is ejected upwards relative to the movable mould core when the push plate floats, and further ejection force exists at the bottom of the product so as to match the movable mould core to rotate and remove teeth, and the demoulding action of the product is achieved faster.

Further, two the bottom of half slider all is equipped with the drag hook, the hook face of going up the drag hook is the inclined plane, two the hook portion orientation of going up the drag hook of half slider sets up relatively, the top of movable mould board be fixed with go up the drag hook that the drag hook corresponds down, the hook face of drag hook is the inclined plane down, the drag hook groove has been seted up to the push pedal, the drag hook is arranged in down the drag hook inslot, during the compound die, go up the drag hook and arrange in the drag hook inslot with draw hook looks joint each other down.

When the fixed die part and the movable die part are clamped, the two half sliders are close to each other under the action of the supporting needle and the slider guide bar to realize the clamping, and at the moment, the fixed die spring in the half sliders is in a compressed state; when the die is opened, in order to prevent the fixed die spring from being blocked and the two half sliders cannot be ejected and separated, the bottom of the half sliders is provided with the upper draw hook for inclined hook connection with the lower draw hook of the movable die plate, when the fixed die plate is opened upwards, a synchronous upward force is applied to the half sliders, at the moment, due to the limit effect of the lower draw hook on the upper draw hook, the two half sliders slowly lift upwards and simultaneously start to slide and separate along the slider guide strips to the outer sides of the mounting grooves under the action force of the lower draw hook, and after the half sliders slide to the limit position of the slider guide strips, the upper draw hook and the lower draw hook are unhooked, the die opening is completed, and the demoulding of the external thread forming part of the product is realized.

Further, be equipped with three gear groove in the base, three output gear, fourth drive gear, third drive gear are installed through the bearing respectively in the gear groove, hydraulic motor's output shaft with output gear connects, output gear with fourth drive gear meshing, fourth drive gear with third drive gear meshing, the top of main drive shaft is installed through the bearing the bottom of movable mould board, the bottom of main drive shaft passes through the through-hole plug-in connection in the gear groove with third drive gear connects.

When the die is required to be removed, the hydraulic motor is started, the hydraulic motor drives the fourth transmission gear to rotate through the output gear, and then the fourth transmission gear drives the third transmission gear to rotate so that the main transmission shaft synchronously rotates, and then the first transmission gear is driven to rotate through the second transmission gear, so that the first transmission gear drives the movable die core to rotate, and the external thread at the top of the movable die core is screwed downwards relative to the product, so that the die is removed. Because the two sides of the product are propped against rotation through the rotation stopping positioning ports of the two rotation stopping assemblies before the die is removed, the product is kept in a fixed state, so that the hydraulic motor can stably drive the movable die core to rapidly rotate the die to remove the die, and the die removing efficiency can be effectively improved.

Further, the four corners of the movable mould plate are fixedly provided with movable mould guide posts, the movable mould guide posts penetrate out of the push plate through heavy-load linear bearings, and the fixed mould plate is provided with fixed mould guide sleeves matched with the movable mould guide posts.

The movable die guide post plays a role in guiding and positioning, and when the die assembly is carried out, the fixed die guide sleeve and the movable die guide post are aligned and inserted, so that the fixed die part and the movable die part can be accurately clamped. The invention changes the common guide sleeve of the push plate into a heavy-load linear bearing, so that the push plate can float towards the axis direction of the movable mould core with extremely small friction force when floating upwards under the acting force of the floating spring.

Further, a travel switch is fixed on one side of the mounting plate, and a travel contact block matched with the travel switch is arranged on one side of the push block, which is close to the hydraulic oil cylinder.

After demoulding is finished, the hydraulic oil cylinder drives the push block to slide and return along the guide rail, and when the stroke contact block is contacted with the stroke switch, the hydraulic oil cylinder stops driving the push block to slide, so that the push block can be accurately reset, and the push block can be started again when the cutting is stopped next time.

Compared with the prior art, the invention has the following beneficial effects:

According to the invention, the two half sliders are combined to form the cavity through the die assembly of the fixed die plate and the movable die plate, injection molding is carried out to form a product, then the die is opened, demoulding of an external thread part of the product is completed after preliminary die opening, the product is cut and stopped by the external cutting rotation stopping mechanisms at two sides, and then the external tooth twisting mechanisms are driven to drive the movable die core to rotate, so that tooth twisting withdrawing is realized, demoulding of an internal thread part of the product is realized, full-automatic operation is carried out in the whole process, the production efficiency can be effectively improved, and the reject ratio of the product is reduced.

The internal thread length and the rotation stopping length of the general product are not matched, and the internal thread forming die usually requires the thread length to be 1-2mm longer than the rotation stopping length, so that the die disclosed by the invention adopts an external rotation stopping and internal die cutting integrated design, and can realize internal die cutting and rotation stopping and simultaneously realize resource saving.

Drawings

FIG. 1 is a schematic view of the structure of an automatic demolding mold for internal and external threads according to the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a B-B cross-sectional view of FIG. 2;

FIG. 5 is an enlarged schematic view of portion C of FIG. 3;

FIG. 6 is an enlarged schematic view of portion D of FIG. 5;

FIG. 7 is a schematic structural view of the stationary mold part;

FIG. 8 is a schematic view of the structure of the stationary mold part with one of the half slides removed;

FIG. 9 is a schematic view of the structure of the movable mold part;

FIG. 10 is a schematic view of the movable mold part with the push plate removed and the cutting rotation stopping mechanism;

FIG. 11 is a schematic view of the bottom structure of the movable platen;

fig. 12 is a schematic view of the movable mold part with the upper part of the movable mold plate removed.

In the figure: the mold comprises a fixed mold panel 1, a fixed mold plate 2, a half slide block 3, a mold half cavity 301, a mold half runner 302, a slide block guide bar 4, a main runner 5, a sprue 6, a fixed mold core 7, a holding pin 8, a fixed mold spring 9, a push plate 10, a movable mold plate 11, a vertical plate 12, a base 13, a movable mold core 14, a core sleeve 15, a first transmission gear 16, a holding pin groove 17, a mounting plate 18, a hydraulic cylinder 19, a guide rail 20, a push block 21, a rotation stopping positioning port 22, a tool apron 23, a blade 24, a product 25, a main transmission shaft 26, a hydraulic motor 27, a second transmission gear 28, a third transmission gear 29, an output gear 30, a thimble 31, a thimble panel 32, a thimble bottom plate 33, a thimble 34, a thimble spring 35, a thimble guide post 36, an ejection limit post 37, a limit equal height screw 38, a floating spring 39, a fourth transmission gear 40, a movable mold guide post 41, a fixed mold guide sleeve 42, a travel switch 43, a travel contact block 44, an air pipe 45, a high-speed rotating air cock 46, a one-way mechanical air valve 47, an air valve block 48, an air outlet port 49, an air outlet port 50, a second flow gap 52, a third flow gap 52, a drag hook 54, a drag groove 53, and a drag groove 53, a drag groove 54.

Arrows in fig. 5 and 6 indicate the gas flow direction.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.

Example 1:

as shown in fig. 1 to 12, the automatic demolding die for internal and external threads of the embodiment comprises a fixed die part and a movable die part which can be mutually matched, and a cutting rotation stopping mechanism and a tooth twisting mechanism for demolding products;

the fixed mold part comprises a fixed mold panel 1 and a fixed mold plate 2 fixed at the bottom of the fixed mold panel 1, wherein the fixed mold plate 2 is provided with a mounting groove, two half slide blocks 3 which are symmetrically arranged are arranged in the mounting groove, the two half slide blocks 3 are respectively provided with a half mold cavity 301 and a half mold runner 302 which is communicated with the half mold cavity 301, the inner side wall of the half mold cavity 301 is provided with internal threads, the half mold cavities 301 of the two half slide blocks 3 and the half mold runner 302 are oppositely arranged, the two half slide blocks 3 slide along a slide block guide bar 4 at one side of the mounting groove so that the two oppositely arranged half mold cavities 301 are matched or opened, and the two oppositely arranged half mold runners 302 are combined to form a main runner 5 for injection molding or separation and stripping; the top of the fixed mold panel 1 is provided with a sprue 6 which is communicated with the main runner 5, the bottom of the fixed mold panel is fixedly provided with a fixed mold core 7, the fixed mold core 7 is arranged between two half mold cavities 301 which are oppositely arranged on two half sliders 3, the bottom of the fixed mold panel 1 is provided with a holding needle 8, the holding needle 8 penetrates out of an inclined guide hole of the half sliders 3, and a fixed mold spring 9 which is sleeved on the holding needle 8 is arranged in the inclined guide hole;

The movable mould part comprises a push plate 10, a movable mould plate 11, vertical plates 12 and a base 13, wherein the vertical plates 12 are respectively fixed on two sides of the base 13, a hollow installation space is formed between the two vertical plates 12, the tops of the two vertical plates 12 are respectively fixedly connected with two sides of the bottom of the movable mould plate 11, the movable mould plate 11 is provided with a floating structure, and the push plate 10 is installed on the top of the movable mould plate 11 through the floating structure; the movable mold plate 11 is provided with a movable mold core 14, the outer side of the inserting end of the movable mold core 14 is provided with external threads, the movable mold core 14 penetrates out of the movable mold plate 11 through a bearing, the inserting end penetrates out of a core sleeve 15 fixed on the push plate 10 and is provided with an inserting port to be matched and inserted with the fixed mold core 7, so that two half mold cavities 301 form a mold cavity when mold closing is realized, and the other end penetrates out of the bottom of the movable mold plate 11, is arranged in an installation space and is sleeved with a first transmission gear 16; the pushing plate 10 is provided with a needle holding groove 17, and when the die is closed, the tail end of the needle holding 8 is inserted into the needle holding groove 17 so as to compress the fixed die spring 9;

the cutting rotation stopping mechanism comprises a cutting assembly and rotation stopping assemblies symmetrically arranged on two sides of a push plate 10, the rotation stopping assemblies comprise a mounting plate 18, a hydraulic cylinder 19, a guide rail 20 and push blocks 21, the mounting plate 18 is fixed on one side of the push plate 10, the hydraulic cylinder 19 is arranged on the mounting plate 18 and used for driving the push blocks 21 to slide along the guide rail 20, the guide rail 20 is arranged on the push plate 10, a gap for accommodating the guide rail 20 is formed in a fixed template 2, rotation stopping positioning ports 22 are formed in the tail ends of the push blocks 21 of one rotation stopping assembly, and the cutting assembly comprises a cutter seat 23 fixed at the tail ends of the push blocks 21 and blades 24 arranged on two sides of the cutter seat 23; after the die is opened, the rotation stopping positioning ports 22 of the two rotation stopping assemblies respectively stop and jack the product 25 from two sides, and simultaneously the blade 24 cuts off the connection between the product 25 and the gate;

The winch mechanism comprises a main transmission shaft 26 and a hydraulic motor 27, the main transmission shaft 26 is rotatably arranged in the installation space, a second transmission gear 28 is sleeved at the top of the main transmission shaft 26 and meshed with the first transmission gear 16, a third transmission gear 29 is sleeved at the bottom of the main transmission shaft and driven by an output gear 30 of the hydraulic motor 27, and the hydraulic motor 27 is arranged on one side of the base 13.

The use process of the mold of this embodiment is as follows:

when the mold is closed, the injection molding machine drives the fixed template 2 to be close to the push plate 10 downwards, the tail ends of the holding pins 8 of the two half sliders 3 are placed in the holding pin grooves 17 of the push plate 10 at the moment, in the downward process of the fixed template 2, due to the action of the inclined holding pins 8, the two half sliders 3 gradually approach each other towards the inner sides of the mounting grooves along the slider guide strips 4, at the moment, the fixed mold springs 9 are gradually compressed, the floating structure at the bottom of the push plate 10 is compressed, when the fixed template 2 is completely attached to the push plate 10, the two half sliders 3 are combined together, corresponding half mold cavities 301 and half mold runners 302 in the two half sliders 3 are combined to form a mold cavity and a main runner 5, at the moment, the fixed mold core 7 is synchronously inserted into an inserting port of the movable mold core 14, and the two half mold cores are placed in the mold cavity, and the mold cavity is closed, then the injection molding machine performs injection molding on the main runner 5 through the sprue 6, so that sol flows into the mold cavity through the main runner 5, and products 25 are subjected to injection molding; wherein, since the inner side wall of the half mold cavity 301 is provided with the internal thread, and the outer side of the plug end of the movable mold core 14 is provided with the external thread, after the mold is closed, the internal and external threads are formed on the inner and outer walls formed in the cavity, so that the product 25 is injection molded into a screw member with the internal and external threads;

After the die assembly is completed, the die opening is required, when the die opening is carried out, the injection molding machine drives the fixed die plate 2 to be separated upwards, at the moment, the tail ends of the holding pins 8 arranged on the two half slide blocks 3 start to be separated from the holding pin grooves 17 of the push plate 10, in the upward process of the fixed die plate 2, due to the reset action of the fixed die springs 9, the two half slide blocks 3 are pushed to gradually separate from each other along the slide block guide strips 4 towards the outer sides of the mounting grooves, at the moment, the floating structure at the bottom of the push plate 10 is not compressed, the push plate 10 is pushed to slowly upwards eject a product 25, when the half slide blocks 3 slide outwards to a limiting position, at the moment, the holding pins 8 are completely separated from the holding pin grooves 17, and at the same time, the fixed die core 7 is synchronously separated from the inserting ports of the movable die core 14, so that the die opening is completed, and the demoulding of an external thread forming part of the product 25 is realized; then the injection molding machine continues to drive the fixed template 2 to reset the fixed mold part;

after the die opening is completed, cutting, rotation stopping and die stripping are required, during die stripping, the hydraulic cylinders 19 on two sides are driven, so that the two hydraulic cylinders 19 respectively drive the two push blocks 21 to approach the product 25 along the guide rail 20 until the rotation stopping positioning ports 22 at the tail ends of the two push blocks 21 clamp rotation stopping ribs on two sides of the product 25, the hydraulic cylinders 19 are stopped to be driven, and meanwhile, the blades 24 at the tail ends of the push blocks 21 also cut off the connection between the product 25 and a pouring gate, and the product 25 is stopped and tightly pressed while the product 25 is cut off; then the hydraulic motor 27 is controlled by the injection molding machine, the hydraulic motor 27 is driven by the output gear 30 and the third transmission gear 29, the main transmission shaft 26 is driven by the first transmission gear 16 to rotate by the second transmission gear 28, the movable mold core 14 rotates synchronously, the movable mold core 14 rotates relative to the product 25, the movable mold core 14 floats towards the axis direction of the movable mold core 14 under the action force of the floating structure during the tooth twisting, the bottom of the product 25 is further continuously propped up, the movable mold core 14 continues to rotate until the product 25 is separated from the movable mold core 14, the demoulding is realized on the internal thread forming part of the product 25, and the tooth twisting demoulding action is completed, so that the product 25 can be taken out;

After the completion of the demolding, the hydraulic cylinder 19 is driven to reset the push block 21, and the hydraulic motor 27 is also reversed to reset the movable mold core 14.

In this embodiment, each half slider 3 is provided with two half mold cavities 301, two fixed mold cores 7 and two movable mold cores 14 are correspondingly provided in the mold, after the mold is closed, two mold cavities are formed in the mold, and two products 25 can be injection molded in the two mold cavities, so that the mold can realize one-out-two. Meanwhile, in order to make the two half sliders 3 more stable when the two half sliders 3 are used for closing or opening the mold, the two sides of the half sliders 3 slide through the slider guide strips 4, and the two sides are distributed with the holding pins 8, so that the half sliders are more stable when being inserted for closing the mold.

In this embodiment, in order to tightly fit the guide rails 20 of the rotation stopping assemblies at both sides during mold clamping, notches are formed at corresponding positions of the fixed mold plate 2 to accommodate the guide rails 20, so as to avoid uneven mold clamping. Similarly, it is common for those skilled in the art to provide a plurality of notches on the corresponding plates according to the mold clamping requirements for the placement positions of certain components without affecting the execution process of the present mold, which will not be described herein.

Referring to fig. 3 and 12, in this embodiment, the mold is further provided with an ejection mechanism, which includes an ejector pin 31, an ejector pin panel 32, an ejector pin bottom plate 33, an ejector pin 34, a return pin spring 35, and a return pin guide pin 36;

the thimble panel 32 is fixedly laminated on the thimble bottom plate 33, the thimble bottom plate 33 is arranged at the bottom of the installation space, and the thimble bottom plate 33 and the thimble panel 32 have the same size and can move in the installation space without obstruction; the bottom end of the needle guide post 36 is fixed on the needle panel 32, and the top end sequentially and movably passes through the movable template 11 and the push plate 10 upwards through the through hole and is leveled with the surface of the push plate 10; the return needle spring 35 is arranged in the installation space and sleeved on the return needle guide post 36, one end of the return needle spring 35 is connected with the thimble panel 32, and the other end is connected with the bottom of the movable template 11; the bottom of the thimble 31 is fixed on the thimble panel 32, when the mold is closed, the top of the thimble 31 sequentially and upwards penetrates through the movable mold plate 11, the push plate 10 stretches into the fixed mold plate 2 to correspond to a cold material well of the main runner 5; the ejector post 34 is fixed at the bottom of the ejector bottom plate 33 and is movably arranged in the through hole of the base 13.

After the product 25 is separated from the movable mold core 14, cold materials in the main runner 5 are required to be ejected, at the moment, the ejector pins 34 are ejected upwards through the ejector rollers of the injection molding machine, the ejector pins 34 are ejected upwards in the through holes of the base 13, the ejector pin bottom plate 33 at the top is driven to eject upwards, so that the ejector pins 31 on the ejector pin panel 32 eject upwards to realize the ejection of cold material wells of the main runner 5, at the moment, the ejector pin springs 34 are pushed upwards by the ejector pin panel 32 to compress, and after ejection is finished, the ejector pin panel 32 resets downwards under the action of the ejector pin springs 34, and then the ejector pins 31 are reset. Because the spring has a long service life, its elasticity will change, possibly when the spring is reset, so that a gap of several millimeters exists between the ejector pin bottom plate 33 and the base 13, and at this time, the top of the needle return guide post 36 can be forced by a human hand, so as to ensure that the needle return guide post 36 pushes the ejector pin bottom plate 33 to return to the position.

Wherein, ejector limit posts 37 are fixed on the ejector plate 32. When the ejector pin 31 is ejected upwards, the ejection limiting column 37 is used for limiting the upward ejection height of the ejector pin 31 so as not to excessively compress the return pin spring 34, and meanwhile, the distance between the ejection limiting column 37 and the bottom of the movable mould plate 11 is ensured to be larger than the distance for ejecting the cold material in the main runner 5 by upward movement of the ejector pin 31 so as to ensure that the ejector pin 31 can eject the cold material smoothly.

Referring to fig. 3, in this embodiment, the floating structure includes a spacing equal-height screw 38 and a floating spring 39, a spring groove and a spacing groove are provided in the movable mold plate 11, a through hole is provided between the spring groove and the spacing groove, the spacing end of the spacing equal-height screw 38 is disposed in the spacing groove, the other end passes through the through hole to go out of the spacing groove and is disposed in the spring groove, the top is fixedly connected with the bottom of the push plate 10, the floating spring 39 is disposed in the spring groove and is sleeved on the spacing equal-height screw 38, one end of the floating spring 39 is connected with the bottom of the push plate 10, and the other end is connected with the bottom of the spring groove.

When the die is closed, the fixed die plate 2 presses the push plate 10 downwards so that the push plate 10 is tightly attached to the movable die plate 11, and at the moment, the floating springs 39 are compressed in the spring grooves; when the die is opened, the fixed die plate 2 does not compress the push plate 10 any more, the push plate 10 floats towards the axis direction of the movable die core 14 under the action of the floating spring 39 due to the reset action of the floating spring 39, and after the push plate 10 floats for a certain distance, the push plate 10 does not float upwards due to the limiting action of the limiting groove on the limiting equal-height screws 38. Because the core sleeve 15 is fixed on the push plate 10, the core sleeve 15 is ejected upwards relative to the movable mold core 14 while the push plate 10 floats, so that an ejection force exists on the bottom of the product 25 to match the movable mold core 14 to rotate and strip teeth, and the product 25 can be quickly stripped.

Referring to fig. 4, in this embodiment, three gear grooves are provided in the base 13, an output gear 30, a fourth transmission gear 40 and a third transmission gear 29 are respectively mounted in the three gear grooves through bearings, an output shaft of the hydraulic motor 27 is connected with the output gear 30, the output gear 30 is meshed with the fourth transmission gear 40, the fourth transmission gear 40 is meshed with the third transmission gear 29, the top of the main transmission shaft 26 is mounted at the bottom of the movable mold plate 11 through bearings, and the bottom of the main transmission shaft 26 is inserted into the gear grooves through a through hole and connected with the third transmission gear 29.

When the die-cutting die is required to be removed, the hydraulic motor 27 is started, the hydraulic motor 27 drives the fourth transmission gear 40 to rotate through the output gear 30, and then the fourth transmission gear 40 drives the third transmission gear 29 to rotate so as to synchronously rotate the main transmission shaft 26, and then the first transmission gear 16 is driven to rotate through the second transmission gear 28, so that the first transmission gear 16 drives the movable die core 14 to rotate, and the external thread at the top of the movable die core 14 is rotated downwards relative to the product 25, so that the die-cutting die is realized. Because the two sides of the product 25 are propped against rotation through the rotation stopping positioning ports 22 of the two rotation stopping assemblies before the tooth is demolded, so that the product 25 is kept in a fixed state, the movable mold core 14 can be stably driven by the hydraulic motor 27 to rapidly rotate the tooth for demolding, and the demolding efficiency can be effectively improved.

Referring to fig. 3, 7 and 9, in the present embodiment, the movable mold guide posts 41 are fixed at four corners of the movable mold plate 11, the movable mold guide posts 41 penetrate out of the push plate 10 through heavy-load linear bearings, and the fixed mold plate 2 is provided with a fixed mold guide sleeve 42 adapted to the movable mold guide posts 41.

The movable mold guide post 41 plays a role in guiding and positioning, and is aligned and inserted with the movable mold guide post 41 through the fixed mold guide sleeve 42 when the mold is closed, so that the fixed mold part can be accurately closed with the movable mold part. The invention changes the common guide sleeve of the push plate 10 into a heavy-load linear bearing, so that the push plate 10 can float towards the axis direction of the movable mould core 14 with extremely small friction force when floating upwards under the acting force of the floating spring 39.

Referring to fig. 1, in the present embodiment, a travel switch 43 is fixed to one side of the mounting plate 18, and a travel contact block 44 that cooperates with the travel switch 43 is provided to one side of the push block 21 near the hydraulic cylinder 19. After demoulding is finished, the hydraulic cylinder 19 drives the push block 21 to slide and return along the guide rail 20, and when the travel contact block 44 is contacted with the travel switch 43, the hydraulic cylinder 19 stops driving the push block 21 to slide, so that the push block 21 can be accurately reset, and the push block can be started again when the cutting is stopped next time.

According to the invention, the fixed die plate 2 and the movable die plate 11 are combined to form the cavity, injection molding is carried out to form the product 25, then the die is opened, the demolding of the external thread part of the product 25 is finished after preliminary die opening, the product 25 is cut and stopped by the external cutting rotation stopping mechanisms on two sides, and then the external tooth twisting mechanism is driven to drive the movable die core 14 to rotate, so that tooth twisting is withdrawn, demolding of the internal thread part of the product 25 is realized, the whole process is fully-automatic, the production efficiency can be effectively improved, and the reject ratio of the product is reduced.

The internal thread length of the product 25 is not matched with the rotation stopping length, and the internal thread forming die is required to be 1-2mm longer than the rotation stopping length, so that the die disclosed by the invention adopts an external rotation stopping and internal die cutting integrated design, and can realize internal die cutting and rotation stopping and simultaneously realize resource saving.

Example 2:

referring to fig. 1, 3, 5 and 6, the present embodiment is similar to embodiment 1 except that in this embodiment, the mold is further provided with an air cooling mechanism, and the air cooling mechanism includes an air pipe 45, a high-speed rotary air tap 46, a unidirectional mechanical air valve 47, and an air valve contact block 48;

One end of the air pipe 45 is communicated with an air source through a one-way mechanical air valve 47, the other end of the air pipe 45 is connected with a high-speed rotary air tap 46, the high-speed rotary air tap 46 is arranged in an installation space and is installed at the bottom of the movable mold core 14, an air passage 49 is formed in the movable mold core 14 and is communicated with the high-speed rotary air tap 46, the top of the air passage 49 is directly communicated into an inserting port, when the mold is closed, the fixed mold core 7 is inserted into the inserting port and forms a first flow gap 50 with the inserting port, two sides of the movable mold core 14 are provided with air outlet holes 51 communicated with the first flow gap 50, a second flow gap 52 is formed between the movable mold core 14 and the core sleeve 15, the air outlet holes 51 are communicated with the second flow gap 52, a third flow gap 53 communicated with the outside is formed between the top of the movable mold plate 11 and the bottom of the push plate 10, and the second flow gap 52 is communicated with the third flow gap 53, so that air flow is discharged to the outside through the third flow gap 53;

the unidirectional mechanical air valve 47 is fixed on one side of the movable mould plate 11, and the air valve contact block 48 is fixed on one side of the fixed mould plate 2 for contacting and controlling the opening and closing of the unidirectional mechanical air valve 47.

When the product 25 is subjected to die assembly and injection molding, the mold core needs to be cooled, and as the top end of the movable mold core 14 and the tail end of the fixed mold core 7 adopt a deepened and enlarged positioning inserting mode, firstly, the cooling of the fixed mold core 7 is fully utilized to take away the heat of the movable mold core 14 in the injection molding process, and meanwhile, the movable mold core 14 can be rapidly cooled through cooling gas, so that the cooling effect is improved, and the product molding is accelerated.

The specific cooling process is as follows:

during mold closing, the fixed mold core 7 is inserted into an insertion port of the movable mold core 14, cooling water is continuously introduced into the fixed mold core 7 through a pipeline to cool, at this time, the heat of the movable mold core 14 in the injection molding process is taken away by fully utilizing the cooling of the fixed mold core 7, meanwhile, the air valve contact block 48 is in contact with the unidirectional mechanical air valve 47 during mold closing, the air valve is opened, the air pipe 45 sprays cooling gas into the air passage 49 of the movable mold core 14 through the high-speed rotary air nozzle 46 to rapidly take away the heat of the movable mold core 14, the cooling gas continuously flows upwards into the insertion port along the air passage 49 to flow to the air outlet 51 through the first flow gap 50, the inserted part of the fixed mold core 7 and the movable mold core 14 is further cooled, then the gas flows to the second flow gap 52 through the air outlet 51, flows to the third flow gap 53 through the second flow gap 52, and finally is discharged to the outside through the third flow gap 53.

When the product 25 is opened, the valve contact block 48 is separated from contact with the unidirectional mechanical valve 47, and at this time, the valve is closed, and no gas is introduced for cooling. The invention realizes the functions of mold closing and ventilation and mold opening and closing, and effectively improves the cooling efficiency of the movable mold core 14 during mold closing.

It should be noted that, the fixed mold core 7, the half slide 3, the push plate 10 and the movable mold plate 11 of the present invention are all provided with a circulation cooling pipe (not shown in the figure) which is communicated with the outside, and the circulation cooling pipe is a water cooling means commonly used by those skilled in the art, and is not described herein. The above-mentioned components of the present invention are all cooled by the circulating cooling duct at the same time as the above-mentioned gas cooling, and the present invention adds the above-mentioned gas mechanism in order to accelerate the cooling process and to improve the cooling efficiency of the movable mold core 14.

Referring to fig. 3, 6 and 10, in the present embodiment, the top of the movable platen 11 is formed with the silencing air groove 54, the silencing air groove 54 is rectangular pulse-shaped, and when the mold is closed, the floating structure is compressed to make the push plate 10 abut against the top of the movable platen 11, and at this time, the silencing air groove 54 forms the third flow-through gap 53 between the push plate 10 and the movable platen 11.

The cooling inlet of the moving mold core 14 is arranged at the tail part of the core and is connected by the high-speed rotary air tap 46, but the discharge part of the third flowing clearance 53 cannot be connected by the air tap, so the invention can effectively buffer high-speed air flow and noise when compressed air is discharged and reduce noise pollution of workshops by milling the silencing air groove 54 on the moving mold plate and processing the silencing air groove into a rectangular pulse-shaped groove capable of slowing down air flow.

Example 3:

referring to fig. 4, 7 and 10, the present embodiment is similar to embodiment 1, except that in this embodiment, the bottoms of the two half sliders 3 are both provided with an upper hook 55, the hook surfaces of the upper hooks 55 are inclined planes, the hook portions of the upper hooks 55 of the two half sliders 3 are oppositely arranged, the top of the movable mold plate 11 is fixed with a lower hook 56 corresponding to the upper hook 55, the hook surfaces of the lower hook 56 are inclined planes, the push plate 10 is provided with a hook groove 57, the lower hook 56 is disposed in the hook groove 57, and the upper hook 55 is disposed in the hook groove 57 to be hooked with the lower hook 56 when the mold is closed.

When the fixed die part and the movable die part are clamped, the two half sliders 3 are close to each other under the action of the supporting needle 8 and the slider guide bar 4 to realize the clamping, and at the moment, the fixed die spring 9 in the half sliders 3 is in a compressed state; when the die is opened, in order to prevent the fixed die spring 9 from being blocked and being incapable of ejecting and separating the two half sliders 3, the bottom of the half sliders 3 is provided with the upper draw hook 55 to be hooked with the lower draw hook 56 of the movable die plate 11 in an inclined plane, when the fixed die plate 2 is opened upwards, a synchronous upward force is applied to the half sliders 3, at the moment, due to the limiting effect of the lower draw hook 56 on the upper draw hook 55, the two half sliders 3 are slowly lifted upwards, simultaneously, the two half sliders 3 start to slide and separate along the slider guide strips 4 to the outer sides of the mounting grooves under the acting force of the lower draw hook 56, after the two half sliders slide to the limiting position of the slider guide strips 4, the upper draw hook 55 and the lower draw hook 56 are unhooked, the die opening is completed, and the demoulding of the external thread forming part of the product 25 is realized.

It is to be understood that the above examples of the present invention are provided by way of illustration only and are not intended to limit the scope of the invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. The automatic demolding die for the internal and external threads is characterized by comprising a fixed die part and a movable die part which can be mutually matched, and a cutting rotation stopping mechanism and a tooth twisting mechanism for demolding products;

the fixed mold part comprises a fixed mold panel (1) and a fixed mold plate (2) fixed at the bottom of the fixed mold panel (1), wherein the fixed mold plate (2) is provided with a mounting groove, two half sliding blocks (3) which are symmetrically arranged are arranged in the mounting groove, each half sliding block (3) is provided with a half mold cavity (301) and a half mold runner (302) which is communicated with the half mold cavity (301), the inner side wall of each half mold cavity (301) is provided with an internal thread, the half mold cavities (301) of the two half sliding blocks (3) and the half mold runners (302) are oppositely arranged, the two half sliding blocks (3) slide along a sliding block guide strip (4) at one side of the mounting groove so that the two half mold cavities (301) which are oppositely arranged are matched or opened, and the two half mold runners (302) which are oppositely arranged are also combined to form a main runner (5) or separated and stripped; the top of the fixed die panel (1) is provided with a sprue (6) which is communicated with the main runner (5), the bottom of the fixed die panel is fixedly provided with a fixed die core (7), the fixed die core (7) is arranged between two half die cavities (301) which are oppositely arranged on the half sliders (3), the bottom of the fixed die panel (1) is provided with a supporting needle (8), the supporting needle (8) penetrates out of an inclined guide hole of the half sliders (3), and a fixed die spring (9) is arranged in the inclined guide hole and sleeved on the supporting needle (8);

The movable die component comprises a push plate (10), a movable die plate (11), vertical plates (12) and a base (13), wherein the vertical plates (12) are respectively fixed on two sides of the base (13), a hollow installation space is formed between the two vertical plates (12), the tops of the two vertical plates (12) are respectively fixedly connected with two sides of the bottom of the movable die plate (11), the movable die plate (11) is provided with a floating structure, and the push plate (10) is installed on the top of the movable die plate (11) through the floating structure; the movable mould core (14) is arranged on the movable mould (11), external threads are arranged on the outer side of the plug-in end of the movable mould core (14), the movable mould core (14) penetrates out of the movable mould (11) through bearing installation, the plug-in end penetrates out of a core sleeve (15) fixed on the push plate (10) and is provided with a plug-in port to be matched and plugged with the fixed mould core (7), so that two half mould cavities (301) form a cavity when the mould is closed, and the other end penetrates out of the bottom of the movable mould core (11) to be placed in the installation space and is sleeved with a first transmission gear (16); the pushing plate (10) is provided with a needle holding groove (17), and when the die is closed, the tail end of the needle holding (8) is inserted into the needle holding groove (17) so as to compress the fixed die spring (9);

the cutting rotation stopping mechanism comprises a cutting assembly and rotation stopping assemblies symmetrically arranged on two sides of the push plate (10); the anti-rotation assembly comprises a mounting plate (18), a hydraulic oil cylinder (19), a guide rail (20) and a push block (21), wherein the mounting plate (18) is fixed on one side of the push plate (10), the hydraulic oil cylinder (19) is mounted on the mounting plate (18) and used for driving the push block (21) to slide along the guide rail (20), the guide rail (20) is arranged on the push plate (10), a notch for accommodating the guide rail (20) is formed in the fixed die plate (2), and an anti-rotation positioning opening (22) is formed in the tail end of the push block (21); the cutting assembly is arranged at the tail end of a pushing block (21) of one rotation stopping assembly and comprises a cutter seat (23) fixed at the tail end of the pushing block (21) and blades (24) arranged at two sides of the cutter seat (23); after the die is opened, the rotation stopping positioning ports (22) of the two rotation stopping assemblies respectively stop and jack the product (25) from two sides, and simultaneously the blade (24) cuts off the connection between the product (25) and the pouring gate;

The tooth twisting mechanism comprises a main transmission shaft (26) and a hydraulic motor (27), the main transmission shaft (26) is rotatably installed in the installation space, a second transmission gear (28) is sleeved at the top of the main transmission shaft (26) and meshed with the first transmission gear (16), a third transmission gear (29) is sleeved at the bottom of the main transmission shaft and is in transmission with an output gear (30) of the hydraulic motor (27), and the hydraulic motor (27) is installed on one side of the base (13).

2. The automatic demolding mold for internal and external threads according to claim 1, characterized in that it is further provided with an ejection mechanism comprising a thimble (31), a thimble panel (32), a thimble bottom plate (33), a thimble column (34), a thimble spring (35) and a thimble guide column (36);

the thimble panel (32) is fixedly laminated on the thimble bottom plate (33), and the thimble bottom plate (33) is arranged at the bottom of the installation space; the bottom end of the needle return guide post (36) is fixed on the thimble panel (32), and the top end sequentially and upwards passes through the movable template (11) and the push plate (10) in a movable way through the through hole and is leveled with the surface of the push plate (10); the needle return spring (35) is arranged in the installation space and sleeved on the needle return guide post (36), one end of the needle return spring (35) is connected with the thimble panel (32), and the other end of the needle return spring is connected with the bottom of the movable template (11); the bottom of the thimble (31) is fixed on the thimble panel (32), and when the mold is closed, the top of the thimble (31) sequentially and upwards moves out of the movable mold plate (11) and the push plate (10) extend into the fixed mold plate (2) to correspond to a cold material well of the main runner (5); the ejector column (34) is fixed at the bottom of the ejector pin bottom plate (33) and is movably arranged in the through hole of the base (13).

3. An automatic demolding mold for internal and external threads according to claim 2, characterized in that said ejector plate (32) is fixed with ejector limit posts (37).

4. The automatic demolding mold for internal and external threads according to claim 1, characterized in that the mold is further provided with an air cooling mechanism, wherein the air cooling mechanism comprises an air pipe (45), a high-speed rotary air tap (46), a unidirectional mechanical air valve (47) and an air valve contact block (48);

one end of the air pipe (45) is communicated with an air source through the unidirectional mechanical air valve (47), the other end of the air pipe is connected with the high-speed rotary air tap (46), the high-speed rotary air tap (46) is arranged in the installation space and is arranged at the bottom of the moving die core (14), an air channel (49) is formed in the moving die core (14) and is communicated with the high-speed rotary air tap (46), the top of the air channel (49) is communicated into the plug-in port, when the die is closed, the fixed die core (7) is plugged into the plug-in port and forms a first communication gap (50) with the plug-in port, air outlet holes (51) communicated with the first communication gap (50) are formed in two sides of the moving die core (14), a second communication gap (52) is formed between the moving die core (14) and the core sleeve (15), the air outlet holes (51) are communicated with the second communication gap (52), a third communication gap (53) is formed between the top of the moving die plate (11) and the bottom of the push plate (10), and the third communication gap (53) is communicated with the outside through the third communication gap (53);

The one-way mechanical air valve (47) is fixed on one side of the movable template (11), and the air valve contact block (48) is fixed on one side of the fixed template (2) and used for controlling the one-way mechanical air valve (47) to be opened and closed in a contact mode.

5. The automatic demolding mold for internal and external threads according to claim 4, wherein a silencing air groove (54) is formed at the top of the movable mold plate (11), the silencing air groove (54) is rectangular pulse-shaped, and the floating structure is compressed when the mold is closed, so that the pushing plate (10) is tightly attached to the top of the movable mold plate (11), and the silencing air groove (54) forms the third flow gap (53) between the pushing plate (10) and the movable mold plate (11).

6. An automatic demolding mold for internal and external threads according to claim 1, characterized in that the floating structure comprises a limiting equal-height screw (38) and a floating spring (39), a spring groove and a limiting groove are arranged in the movable mold plate (11), a through hole is formed between the spring groove and the limiting groove, the limiting end of the limiting equal-height screw (38) is arranged in the limiting groove, the other end of the limiting equal-height screw penetrates out of the limiting groove through the through hole and is arranged in the spring groove, the top of the limiting screw is fixedly connected with the bottom of the pushing plate (10), the floating spring (39) is arranged in the spring groove and is sleeved on the limiting equal-height screw (38), one end of the floating spring (39) is connected with the bottom of the pushing plate (10), and the other end of the floating spring is connected with the bottom of the spring groove.

7. The automatic demolding mold for internal and external threads according to claim 1, wherein the bottoms of the two half sliders (3) are respectively provided with an upper draw hook (55), the hook surfaces of the upper draw hooks (55) are inclined planes, the hook portions of the upper draw hooks (55) of the two half sliders (3) are oppositely arranged, the top of the movable mold plate (11) is fixedly provided with a lower draw hook (56) corresponding to the upper draw hook (55), the hook surfaces of the lower draw hook (56) are inclined planes, the push plate (10) is provided with a draw hook groove (57), the lower draw hook (56) is arranged in the draw hook groove (57), and the upper draw hook (55) is arranged in the draw hook groove (57) to be mutually hooked during mold closing.

8. An automatic demolding mold for internal and external threads according to claim 1, characterized in that three gear grooves are formed in the base (13), an output gear (30), a fourth transmission gear (40) and a third transmission gear (29) are respectively arranged in the three gear grooves through bearings, an output shaft of the hydraulic motor (27) is connected with the output gear (30), the output gear (30) is meshed with the fourth transmission gear (40), the fourth transmission gear (40) is meshed with the third transmission gear (29), the top of the main transmission shaft (26) is arranged at the bottom of the movable mold plate (11) through bearings, and the bottom of the main transmission shaft (26) is inserted into the gear grooves through holes to be connected with the third transmission gear (29).

9. The automatic demolding mold for internal and external threads according to claim 1, wherein the movable mold guide posts (41) are fixed at four corners of the movable mold plate (11), the movable mold guide posts (41) penetrate out of the pushing plate (10) through heavy-load linear bearings, and the fixed mold plate (2) is provided with fixed mold guide sleeves (42) matched with the movable mold guide posts (41).

10. An automatic demolding mold for internal and external threads according to claim 1, characterized in that a travel switch (43) is fixed on one side of the mounting plate (18), and a travel contact block (44) matched with the travel switch (43) is arranged on one side of the push block (21) close to the hydraulic cylinder (19).

Images