CN113085105A

CN113085105A - Traceless demolding shear-free nozzle mold and using method thereof

Info

Publication number: CN113085105A
Application number: CN202110470146.2A
Authority: CN
Inventors: 曾杰强
Original assignee: Maoming Liansu Building Materials Co ltd
Current assignee: Maoming Liansu Building Materials Co ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-07-09

Abstract

The invention relates to the field of PVC pipeline molds, in particular to a traceless demolding shear-free nozzle mold and a using method thereof. The invention comprises a fixed die, a movable die matched with the fixed die for use, and a core arranged in a cavity between the fixed die and the movable die, wherein the movable die is provided with an auxiliary top floating assembly for traceless demoulding and depoling operation of a plastic part, the core is connected with the auxiliary top floating assembly, and the auxiliary top floating assembly is provided with a water gap cutter for simultaneously shearing a water gap during depoling operation. The invention overcomes the defects that the structure of a traditional pneumatic mechanism for cutting off a sprue is complex and easy to damage products after a thimble is used for ejecting a pipe body, and the structure is difficult to maintain, changes the traditional demoulding sequence, realizes a traceless demoulding technology of firstly demoulding a cavity and then demoulding a core according to a mode of firstly ejecting and then loosing the core, can save the introduced complex parts required by the traditional mould, and simultaneously realizes traceless ejection, integrates a demoulding and shearing process, and ensures that the products have more market competitive advantages.

Description

Traceless demolding shear-free nozzle mold and using method thereof

Technical Field

The invention relates to the field of PVC pipeline molds, in particular to a traceless demolding shear-free nozzle mold and a using method thereof.

Background

Aiming at the mould of the PVC drainage pipe fitting, the glue inlet needs to be cut off after the product is injected, but the existing method for removing the water gap has the problems of poor water gap cut, difficult adjustment of flow lines, poor product performance and the like, and aiming at the defects, a water gap cutting device with low cost, high efficiency, high quality and long service life needs to be developed.

The invention discloses a mold for automatically cutting off a water gap, which is characterized in that after a fixed mold and a movable mold are opened, a runner thimble is propped against a runner, a product thimble is propped against a product, a cylinder and a cylinder are respectively fixed on a baffle, the cylinder is hung and buckled with a cutter bar, the cylinder is hung and buckled with a cylinder hanging plate, the cylinder hanging plate is fixed behind a slider seat through screws, the cutter bar penetrates through a hole of the slider seat to slide, so that a cutter fixed on the slider seat is driven to move, when a thimble plate is jacked by an external injection molding machine, a press block is lifted, a sprue of the runner is jacked, at the moment, the cylinder drives the cutter bar to move to drive the sprue of the cutter runner, so that the ejector plate is jacked and reset to drive the press block to be jacked and cut off, and a valve is controlled to control the advance and retreat of the cylinder, and.

However, the above solution still has some problems: on one hand, in the aspect of product appearance, the existing scheme adopts a needle plate ejection mechanism, a series of elements such as a cylinder, a cutter bar, a guide rail, pneumatic control and the like are required to be introduced, the manufacturing cost is high, and in addition, for the problem that when some products cut off a water gap, the products are loosened and easily touch the sharp corner of a mould to cause collision damage, an ejector pin mark is generally left on a PVC drainage pipe fitting to seriously influence the product appearance; on the other hand, the ejector pin and the die are abraded to a certain extent in the production process, so that the problems of flash, unsmooth ejection, burning of the ejector pin and the like easily occur in the position of the ejector pin after a long time, and the ejector pin is high in replacement cost and difficult to maintain in the past for a long time.

Disclosure of Invention

The invention aims to overcome the defects that a pneumatic mechanism is complex in structure and easy to damage a product after a sprue is cut off by a pneumatic mechanism after a thimble is used for ejecting a pipe body in the sprue shearing scheme, and the structure is not easy to maintain, and provides a traceless demolding sprue shearing-free mold and a using method thereof. The invention saves the introduced complex parts required by the traditional die and realizes the traceless ejection and integrated demoulding and shearing processes, so that the product has more market competitive advantages.

In order to solve the technical problems, the invention adopts the technical scheme that:

the utility model provides a no trace drawing of patterns is exempted from to cut mouth of a river mould, includes the cover half, the movable mould that cooperatees and is used with the cover half to and locate the core in the die cavity between cover half and the movable mould, be equipped with the vice top of being used for the no trace drawing of patterns of plastic part and depoling operation on the movable mould and float the subassembly, the core floats the subassembly with vice top and is connected, is equipped with the mouth of a river cutter that is used for cutting the mouth of a river operation simultaneously when depoling operation on the vice top.

It should be noted that, generally, the fixed mold inserts and the movable mold inserts of different specifications can be installed on the fixed mold and the movable mold according to the injection molding requirements of different plastic parts, the fixed mold inserts and the movable mold inserts can be detachably connected to form the mold cavities for injection molding of the plastic parts, and the fixed mold inserts and the movable mold inserts of different specifications or the integrally formed movable mold and fixed mold are adopted to form the mold cavities, which do not affect the achievement of the purpose of the invention.

In the process of depoling, a sprue is cut by a nozzle cutter to replace the existing pneumatic water gap cutting mechanism, a series of elements such as an air cylinder, a cutter bar, a guide rail, pneumatic control and the like are not required to be introduced, the design structure is further simplified, and the manufacturing difficulty and the cost of the mold are reduced.

Furthermore, the auxiliary top floating assembly comprises an auxiliary ejector rod demoulding mechanism used for separating the plastic part from the movable mould in the parting direction, a core removing mechanism connected with the auxiliary ejector rod demoulding mechanism and used for separating the plastic part from the core in the core pulling direction, and a water gap cutter is arranged on the core removing mechanism. Therefore, the auxiliary ejector rod demoulding mechanism capable of realizing ejection in the parting direction and the core-pulling mechanism capable of realizing core-pulling in the core-pulling direction of the plastic part are designed correspondingly, and the movement mode of ejection before core pulling is realized.

Furthermore, the auxiliary ejector rod demoulding mechanism comprises an auxiliary ejector connecting rod movably arranged on the movable die in a penetrating mode, a pushing block is fixed at one end, close to the core, of the auxiliary ejector connecting rod, a guide assembly fixed on the movable die and used for limiting the pushing block to move in the parting direction, and an ejection system connected to the other end of the auxiliary ejector connecting rod and used for driving the auxiliary ejector connecting rod to reciprocate, wherein the core is fixed on the pushing block.

Furthermore, the auxiliary ejection connecting rod is connected with the ejection system through an auxiliary ejection rod.

It should be noted that, the movable mold is generally provided with a clearance hole for designing the auxiliary top connecting rod, so that the pushing block can be ejected and pulled back in the parting direction through an ejection system of the injection molding machine. Like this, drive the vice top rod earlier through ejecting system, vice top rod drives the motion of vice top connecting rod, utilize vice top connecting rod lug connection to promote the piece, vice top connecting rod drives the motion that promotes the piece and carry out the parting direction in step, the guide assembly restricts the motion route of promoting the piece in the parting direction, at this moment, whole vice ejector pin demoulding mechanism is ejecting one section distance S toward the die joint direction together, the mould piece of parcel on the core breaks away from the cavity of movable mould mold insert along with vice ejector pin demoulding mechanism together, realize the drawing of patterns on the die joint.

Furthermore, the core removing mechanism comprises a connecting rod which is arranged on the pushing block in a penetrating mode, the connecting rod is parallel to the core, one end of the connecting rod is connected with a push plate which is sleeved on the core, the other end of the connecting rod is connected with a driving device which is used for providing reciprocating power, and a limiting device which is used for limiting the movement distance of the push plate and the pushing block is arranged on the push plate. Therefore, after the plastic part is separated from the cavity of the movable mold along with the auxiliary ejector rod demolding mechanism, the plastic part is pushed out from the core-pulling direction through the push plate arranged between the push block and the plastic part, so that the plastic part is separated from the mold independently, and the plastic part is completely separated from the core and falls out of the mold.

Further, the mouth of a river cutter is located the push pedal and is kept away from one side that promotes the piece. Like this, the mouth of a river cutter is fixed in the push pedal, and it is corresponding with the plastic part on the core and advance the jiao kou position, then the connecting rod of driving cylinder promotes the push pedal and moves towards the direction of the plastic part loose core, makes the mouth of a river cutter of fixing in the push pedal at first arrive and mould the part and correspond and advance jiao kou position at first like this, still wraps up on the core because of moulding this moment to can let the mouth of a river cutter cut off and advance jiao kou position, cut off the back runner and fall naturally, realize cutting the mouth of a river operation.

Furthermore, the guide assembly comprises a guide rail fixed on the movable die, and the guide rail is connected with the pushing block in a sliding mode.

Furthermore, the guide assembly comprises a guide post which is fixed on the movable die and penetrates through the pushing block, and the guide post is connected with the pushing block in a sliding mode.

Furthermore, the guide assembly comprises a guide rail fixed on the movable die and a guide post fixed on the movable die and penetrating through the pushing block, and the guide rail and the guide post are respectively connected with the pushing block in a sliding manner.

It should be noted that the guide assembly is mainly used for limiting the stability of the movement direction of the pushing block on the parting surface, the guide rail or the guide column can be independently adopted for limiting the movement direction, the guide rail and the guide column can be simultaneously adopted for limiting the movement direction, the movement stability of the pushing block is further strengthened, and the realization of the purpose of the invention is not affected by adopting any guide assembly.

Further, stop device includes that one end fixed connection runs through the spacing guide post that promotes the piece simultaneously in the push pedal, the other end fixedly connected with stopper of spacing guide post. Like this, stop device mainly used guarantees the stability of push pedal at the ascending direction of motion of the part of loosing core side of moulding to and the motion position, inject the push pedal through the guide post for promoting the perpendicular reciprocal between the piece, the stopper is injectd the push pedal and is fixed for the reciprocating distance who promotes the piece, guarantees that the push pedal can be complete will mould the part and push away from the core, restriction reciprocating distance's reasonable.

Furthermore, the fixed die and the movable die are provided with locking blocks which are used for preventing the pushing block from loosening during die assembly and injection molding at the positions contacted with the pushing block. Therefore, after the fixed die and the movable die of the die are closed, the pushing block is locked by the locking block fixed on the fixed die and the locking block fixed on the movable die respectively, and looseness is prevented when the pushing block is subjected to injection molding pressure.

The use method of the traceless demoulding shear-free nozzle mould comprises the following steps:

s1 mold separation: after the injection molding of the injection molding machine is finished, the locking block is loosened, the injection molding machine drives the movable mold to separate from the fixed mold, and the movable mold drives the mold core and the plastic part to synchronously separate from the fixed mold and reach a specified position;

s2 demoulding of the plastic part: an ejection system of the auxiliary ejector rod demoulding mechanism drives an auxiliary ejector connecting rod to push a pushing block out of the movable mould for a certain distance in the parting direction, a core connected to the pushing block and the whole core demoulding mechanism are synchronously separated from the movable mould, and a plastic part is separated from a cavity of the movable mould along with the core to finish parting and demoulding of the plastic part;

s3 plastic part core-pulling shearing opening: after the plastic part is subjected to parting and demolding, a driving device of the core-pulling mechanism drives a connecting rod to move a certain distance in the core-pulling direction of the plastic part, a push plate and a water gap cutter which are connected to the connecting rod move a certain distance in the core-pulling direction of the plastic part relative to a core, the water gap cutter firstly reaches the corresponding glue injection position of the plastic part in the moving process of the push plate, the water gap cutter cuts off a sprue, the push plate reaches the port of the plastic part along with the further pushing of the push plate, and then the push plate completely pushes the plastic part away from the core, so that the core pulling and synchronous mouth shearing of the plastic;

and S4, mold closing: after the primary demoulding, core pulling and mouth shearing operations are completed, the movable die is reset according to the steps opposite to the steps S3 and S2, the movable die is pushed to be closed with the fixed die by the injection molding machine, the locking block is locked, and injection molding operation in the next period is prepared.

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

(1) the invention realizes the traceless demoulding and depoling of the plastic part by additionally arranging the auxiliary jacking floating component, utilizes the auxiliary ejector rod to be directly connected to the pushing block to replace the traditional needle plate ejection mechanism, can realize the demoulding without an ejector pin, has no defect of the ejector pin print on the product appearance, and has no service life problem of the original ejector pin.

(2) According to the invention, the water gap cutter is directly arranged on the auxiliary top floating assembly, and the water gap cutter is used for cutting off the pouring gate in the depoling process, so that the existing pneumatic water gap cutting mechanism is replaced, no complex in-mold cutting part is required to be added, the manufacturing cost is much lower than that of the original mold, and the condition that the product is collided on the mold when the water gap cutter cuts off the water gap, so that the plastic part is collided to cause high defective rate is avoided.

(3) The auxiliary jacking component is additionally arranged on the movable mold, the fixed mold does not need to vacate the jacking space of the jacking needle plate, and the whole fixed mold is directly stuck and fixed with the panel of the injection molding machine, so that the condition that the parting surface of the template is warped is avoided, the problem of stress deformation of the template is solved, the appearance of flash is reduced, and the service life of the mold is prolonged.

Drawings

Fig. 1 is a front view of a moving mold cavity of example 1.

Fig. 2 is a schematic structural view of the movable mold according to embodiment 1.

Fig. 3 is a schematic cross-sectional view taken along line a-a in fig. 2.

FIG. 4 is a schematic structural view of a stationary mold according to embodiment 1.

Fig. 5 is a schematic view of the connection structure of the sub-roof link of embodiment 1.

Fig. 6 is a schematic view of a connection structure of the limit guide post according to embodiment 1.

The graphic symbols are illustrated as follows:

1-movable die, 2-auxiliary top connecting rod, 3-lower locking block, 4-pushing block, 5-upper locking block, 5, 6-fixed die, 7-fixed die insert, 8-movable die insert, 9-, 10-core, 11-push plate, 12-driving oil cylinder, 13-auxiliary top rod, 14-limiting guide column, 15-guide column, 16-limiting block, 17-guide rail and 18-nozzle cutter.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in fig. 1 to 6, a traceless demolding non-shearing nozzle mold comprises a fixed mold 6, a fixed mold insert 7 fixed on the fixed mold 6, a movable mold 1 matched with the fixed mold 6 for use, a movable mold insert 8 fixed on the movable mold 1, the fixed mold insert 7 and the movable mold insert 8 are detachably connected to form a mold cavity for plastic part injection molding, and a mold core 10 arranged in the mold cavity between the fixed mold insert 7 and the movable mold insert 8, wherein a secondary top floating assembly for traceless demolding and depoling operation of the plastic part is arranged on the movable mold 1, the mold core 10 is connected with the secondary top floating assembly, and a nozzle cutter 18 for simultaneously performing nozzle shearing operation during depoling operation is arranged on the secondary top floating assembly.

In this way, the non-mark demoulding and depoling of the plastic part are realized by adding the auxiliary jacking floating assembly, the traditional needle plate ejection mechanism is replaced, namely, a series of traditional mould parts such as square iron, an ejector needle plate, a surface needle plate, a support column, a panel, a bottom plate, an ejector pin and the like are not required to be manufactured, the traditional demoulding sequence is changed, the non-mark demoulding technology of firstly demoulding a cavity and then demoulding a core is realized in a mode of firstly ejecting and then loosing core, meanwhile, the water gap cutter 18 is directly arranged on the auxiliary jacking floating assembly, and in the depoling process, a pouring gate is cut off by using a water gap cutter, the existing pneumatic water gap cutting mechanism is replaced, a series of elements such as an air cylinder, a cutter bar, a guide rail, pneumatic control and the like are not required to be introduced, the.

As shown in fig. 1 to 3, the secondary ejection floating assembly includes a secondary ejector demoulding mechanism for separating the plastic part from the movable mould in the parting direction, a core-pulling mechanism connected to the secondary ejector demoulding mechanism and used for separating the plastic part from the core in the core-pulling direction, and a water gap cutter 18 disposed on the core-pulling mechanism. Therefore, the auxiliary ejector rod demoulding mechanism capable of realizing ejection in the parting direction and the push plate core demoulding mechanism capable of realizing core demoulding in the plastic part core-pulling direction are designed correspondingly, and the movement mode of ejection before core pulling is realized.

As shown in fig. 5, the auxiliary ejector rod demoulding mechanism comprises an auxiliary ejector connecting rod 2 movably arranged on the movable mould in a penetrating manner, a pushing block 4 is fixed at one end, close to the mould core, of the auxiliary ejector connecting rod 2, a guide assembly which is fixed on the movable mould and used for limiting the movement of the pushing block 4 in the parting direction is connected to the other end of the auxiliary ejector connecting rod 2 and used for driving the auxiliary ejector connecting rod 2 to reciprocate, the mould core 10 is fixed on the pushing block 4, the auxiliary ejector connecting rod 2 is in transmission connection with the ejection system through an auxiliary ejector rod 13, a clearance hole of the auxiliary ejector connecting rod 2 is formed in the movable mould 1, and therefore the pushing block 4 can be ejected and pulled back in the parting direction through the ejection system of the injection molding.

Like this, through the vice ejector rod 2 of ejecting system drive, utilize vice ejector rod 2 lug connection to promote on piece 4, vice ejector rod 2 drives the motion that promotes piece 4 and carry out the parting direction in step, and guide assembly restricts the motion route of promoting piece 4 in the parting direction, and at this moment, whole vice ejector rod demoulding mechanism is ejecting a distance S towards the die joint direction together, and the plastic part of parcel on core 10 breaks away from the cavity of movable mould mold insert 8 along with vice ejector rod demoulding mechanism together, realizes the drawing of patterns on the die joint.

As shown in fig. 2, the guide assembly comprises a guide rail 17 fixed on the movable mold and a guide post 15 fixed on the movable mold and penetrating through the pushing block 4, wherein the guide rail 17 and the guide post 15 are respectively connected with the pushing block 4 in a sliding manner. In this way, the guide assembly is mainly used for limiting the stability of the movement direction of the pushing block 4 on the parting surface, and meanwhile, the guide rail 17 and the guide column 15 are used for limiting the movement direction, so that the movement stability of the pushing block 4 is further enhanced.

As shown in fig. 2 and 6, the core-releasing mechanism includes a connecting rod penetrating through the pushing block 4, the connecting rod is parallel to the core, one end of the connecting rod is connected with a pushing plate 11 sleeved on the core, the other end of the connecting rod is connected with a driving device 12 for providing reciprocating power, and the pushing plate 11 is provided with a limiting device for limiting the movement distance between the pushing plate 11 and the pushing block 4. Therefore, after the plastic part is separated from the cavity of the movable mold insert 8 along with the secondary ejector rod demoulding mechanism, the plastic part is pushed out from the core-pulling direction through the push plate 11 arranged between the push block 4 and the plastic part, so that the plastic part is separated from the mold independently, and the plastic part is completely separated from the core and falls out of the mold.

As shown in fig. 6, the limiting device includes a limiting guide post 14 having one end fixedly connected to the pushing plate 11 and penetrating through the pushing block 4, and a limiting block 16 fixedly connected to the other end of the limiting guide post 14. Like this, stop device mainly used guarantees the stability of push pedal 11 at the ascending direction of motion of the part of loosing core of moulding, restricts the push pedal 11 through guide post 14 and for promoting the perpendicular reciprocal between the piece 4, and stopper 16 restricts the reciprocating distance of push pedal 11 for promoting piece 4, guarantees that push pedal 11 can be complete will mould the part and push away from the core, guarantees that reciprocating distance is reasonable.

As shown in fig. 3, the nozzle cutter 18 is provided on the push plate 11 on the side away from the push block 4. Therefore, the nozzle cutter 18 is fixed on the push plate 11 and corresponds to the position of the plastic inlet on the mold core 10, then the connecting rod of the driving oil cylinder 12 pushes the push plate 11 to move towards the direction of the plastic part core-pulling 9, so that the nozzle cutter 18 fixed on the push plate 11 firstly reaches the position of the plastic part 9 corresponding to the plastic inlet, and the plastic part 9 is still wrapped on the mold core 10 at the moment, so that the nozzle cutter 18 can cut off the position of the plastic inlet, a flow channel naturally falls after the plastic part is cut off, and the nozzle cutting operation in the mold is realized.

As shown in fig. 3 and 4, an upper locking block 5 for preventing the pushing block 4 from loosening during injection molding is further arranged at the position, in contact with the pushing block 4, of the fixed die 6, and a lower locking block 3 for preventing the pushing block 4 from loosening during injection molding is further arranged at the position, in contact with the pushing block 4, of the movable die 1. Thus, after the fixed die plate 6 and the movable die plate 1 of the die are closed, the pushing block 4 is locked by the upper locking block 5 and the lower locking block 3 which are fixed on the fixed die 6 and the movable die 1 respectively, and the loosening of the pushing block under the injection pressure is prevented.

The working process of the embodiment is as follows:

after the injection molding of the mold is completed, the movable mold plate 1 is separated from the fixed mold plate 6, the fixed mold insert 7 is separated from the plastic part 9, other conventional core-pulling parts are simultaneously pulled away from the plastic part 9, then the auxiliary ejection rod 13 of the injection molding machine ejects the auxiliary ejection connecting rod 2, the ejection pushing block 4 is simultaneously ejected, the mold core 10 connected to the mold core and the whole auxiliary ejection floating assembly eject a distance S to the parting surface direction together, at the moment, the plastic part 9 is separated from the cavity of the movable mold insert 8 and wraps the mold core 10. Then the driving connecting rod of the driving oil cylinder 12 pushes the push plate 11 to move in the core pulling direction of the plastic part 9, so that the water gap cutter 18 fixed on the push plate 11 firstly reaches the position of a corresponding glue inlet of the plastic part 9, the plastic part 9 is still wrapped on the core 10 at the moment, the water gap cutter 18 cuts off a pouring gate, a flow channel naturally falls after being cut off, the plastic part 9 is separated from the core 10 under the action of the pushing force of the push plate 11 along with the further pushing of the push plate 11 until the plastic part reaches the port of the plastic part 9, the limiting block 16 slides to the back of the pushing block 4 after the pushing stroke L, the push plate 11 stops pushing, the plastic part 9 is completely separated from the core 10 at the moment, and the plastic part falls.

After ejection is completed, the oil cylinder 12 is driven to pull the push plate 11 to reset in the die assembly process, the whole auxiliary ejection floating assembly and the core 10 connected with the auxiliary ejection rod 13 of the injection molding machine reset together, and finally the movable die and the fixed die are closed to perform injection molding for a next period.

Example 2

This embodiment is similar to embodiment 1 except that in this embodiment, the guide assembly includes a guide rail 17 fixed to the movable mold, and the guide rail 17 is slidably connected to the pusher block 4. The structure and operation principle of the other parts of this embodiment are the same as those of embodiment 1.

Example 3

This embodiment is similar to embodiment 1, except that in this embodiment, the guide assembly includes a guide post 15 fixed on the movable mold and penetrating the pusher block 4, and the guide post 15 is slidably connected with the pusher block 4. The structure and operation principle of the other parts of this embodiment are the same as those of embodiment 1.

Example 4

s1 mold separation: after the injection molding of the injection molding machine is finished, an upper locking block 5 on the fixed mold 6 and a lower locking block 3 on the movable mold 1 are loosened, the injection molding machine drives the movable mold 1 to be separated from the fixed mold 6, and the movable mold 1 drives the mold core 10 and the plastic part 9 to be separated from the fixed mold 6 synchronously and reach a designated position;

s2 demoulding of the plastic part: an ejection system of the auxiliary ejector rod demoulding mechanism drives an auxiliary ejector connecting rod 2 to push a pushing block 4 out of the movable die 1 for a certain distance in the parting direction, a core 10 connected to the pushing block 4 and the whole core demoulding mechanism are synchronously separated from the movable die 1, and a plastic part 9 is separated from a cavity of the movable die 1 along with the core 10 to finish parting and demoulding of the plastic part 9;

s3 plastic part core-pulling shearing opening: after the plastic part 9 is subjected to parting and demolding, a driving device of the core-pulling mechanism drives a connecting rod to move a certain distance in the core-pulling direction of the plastic part 9, a push plate 11 and a water gap cutter 18 which are connected to the connecting rod move a certain distance in the core-pulling direction of the plastic part relative to a core 10, the water gap cutter 18 firstly reaches a corresponding glue injection position of the plastic part 9 in the moving process of the push plate 11, the water gap cutter 18 cuts off a pouring gate, the push plate 11 reaches a port of the plastic part along with the further pushing of the push plate 11, and then the push plate 11 completely pushes the plastic part 9 away from the core 10, so that the core pulling and synchronous mouth shearing of the plastic part;

and S4, mold closing: after the primary demoulding, core pulling and mouth shearing operations are completed, the movable die 1 is positioned according to the steps of S3 and S2, the movable die 1 is pushed by the injection molding machine to be closed with the fixed die 6, the upper locking block 5 on the fixed die 6 is locked with the lower locking block 3 on the movable die 1, and the injection molding operation of the next period is prepared.

The same or similar reference numerals correspond to the same or similar components.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a no trace drawing of patterns is exempted from to cut mouth of a river mould, includes cover half (6), with movable mould (1) that cover half (6) cooperateed and is used, and locate core (10) in the die cavity between cover half (6) and movable mould (1), its characterized in that, be equipped with on movable mould (1) and be used for the no trace drawing of patterns of plastic part and take off core operation vice top floating assembly, core (10) with vice top floating assembly connects, be equipped with mouth of a river cutter (18) that are used for cutting the mouth of a river operation simultaneously when taking off core operation on the vice top floating assembly.

2. The traceless demoulding shear-free nozzle mould according to claim 1, wherein the secondary top floating assembly comprises a secondary ejector rod demoulding mechanism for separating the plastic part from the movable mould in the parting direction, a core-pulling mechanism connected with the secondary ejector rod demoulding mechanism and used for separating the plastic part from a core in the core-pulling direction, and the nozzle cutter (18) is arranged on the core-pulling mechanism.

3. The traceless demoulding shear-free nozzle mould according to claim 2, wherein the secondary ejector pin demoulding mechanism comprises a secondary ejector connecting rod (2) movably arranged on the movable mould (1), a pushing block (4) is fixedly connected to one end, close to a mould core, of the secondary ejector connecting rod (2), a guide assembly which is fixed on the movable mould (1) and used for limiting the pushing block (4) to move in a parting direction, and an ejection system which is connected to the other end of the secondary ejector connecting rod (2) and used for driving the secondary ejector connecting rod (2) to reciprocate, and the mould core (10) is fixed on the pushing block (4);

the core-pulling mechanism comprises a connecting rod arranged on the pushing block (4) in a penetrating mode, the connecting rod is parallel to the core, one end of the connecting rod is connected with a push plate (11) sleeved on the core, the other end of the connecting rod is connected with a driving device (12) used for providing reciprocating power, a limiting device used for limiting the movement distance of the push plate (11) and the pushing block (4) is arranged on the push plate (11), and a water gap cutter (18) is arranged on the push plate (11) and is far away from one side of the pushing block (4).

4. The traceless demolding shear-free nozzle mold according to claim 3, wherein the secondary ejector connecting rod (2) is connected with the ejection system through a secondary ejector rod (13).

5. The traceless demolding shear-free nozzle mold according to claim 3, wherein the guide assembly comprises a guide rail (17) fixed on the movable mold (1), and the guide rail (17) is in sliding connection with the pushing block (4).

6. The traceless demolding shear-free nozzle mold according to claim 3, wherein the guide assembly comprises a guide column (15) fixed on the movable mold (1) and penetrating through the pushing block (4), and the guide column (15) is in sliding connection with the pushing block (4).

7. The traceless demolding shear-free nozzle mold according to claim 3, wherein the guide assembly comprises a guide rail (17) fixed on the movable mold (1) and a guide column (15) fixed on the movable mold (1) and penetrating through the pushing block (4), and the guide rail (17) and the guide column (15) are respectively connected with the pushing block (4) in a sliding manner.

8. The traceless demolding shear-free nozzle mold according to claim 3, wherein the limiting device comprises a limiting guide column (14) which is fixedly connected to the push plate (11) at one end and penetrates through the pushing block (4), and a limiting block (16) is fixedly connected to the other end of the limiting guide column (14).

9. The traceless demoulding shear-free nozzle mould according to claim 3, wherein a locking block for preventing the pushing block (4) from loosening during mould closing and injection is further arranged at the position, in contact with the pushing block (4), of the fixed mould (6) and the movable mould (1).

10. The use method of the traceless demoulding shear-free nozzle mould is characterized by comprising the following steps:

s1 mold separation: after the injection molding of the injection molding machine is finished, the locking block (16) is loosened, the injection molding machine drives the movable mold (1) to separate from the fixed mold (6), and the movable mold (1) drives the mold core (10) and the plastic part to synchronously separate from the fixed mold (6) and reach a specified position;

s2 demoulding of the plastic part: an ejection system of the auxiliary ejector rod demoulding mechanism drives an auxiliary ejector connecting rod (2) to push a pushing block (4) out of a movable mould (1) for a certain distance in a parting direction, a core (10) connected to the pushing block (4) and the whole demoulding mechanism are synchronously separated from the movable mould (1), and a plastic part is separated from a cavity of the movable mould (1) along with the core (10) to finish parting and demoulding of the plastic part;

s3 plastic part core-pulling shearing opening: after the plastic part is subjected to parting and demolding, a driving device of a core-pulling mechanism drives a connecting rod to move a certain distance in the core-pulling direction of the plastic part, a push plate (11) and a water gap cutter (18) which are connected to the connecting rod move a certain distance in the core-pulling direction of the plastic part relative to a core (10), the water gap cutter (18) firstly reaches the corresponding glue injection position of the plastic part in the moving process of the push plate (11), the water gap cutter (18) cuts off a pouring gate, the push plate (11) reaches the port of the plastic part along with the further pushing of the push plate (11), and then the push plate (11) completely pushes the plastic part away from the core (10) to finish the core-pulling and synchronous mouth-shearing of the plastic part;

and S4, mold closing: after the once demoulding, core pulling and mouth shearing operations are completed, the movable die is reset according to the steps of S3 and S2, the movable die (1) is pushed by the injection molding machine to be closed with the fixed die (6), the locking block (16) is locked, and injection molding operation in a next period is prepared.