KR200404212Y1 - elastic valve system for injection molding - Google Patents

Abstract

The present invention discloses an injection molding machine valve device for a multi-cavity mold.

The injection molding machine valve device for a multi-cavity mold according to the present invention is divided into a tubular bushing which is screwed to a lifting plate and has a selective displacement in the vertical direction, and an upper end of a valve pin provided in the bushing is divided into upper and lower parts. Upper and lower fins each having a flange formed on a surface thereof, and a cushioning means made of upper and lower elastic bodies elastically supporting the upper flange and the lower flange in close contact with each other, and vertically perpendicular to one side of the base plate. It further comprises a pin retracting amount adjusting means having a lifting stopper that is screwed to have a displacement and the lower end thereof is selectively in contact with the upper surface of the upper pin to variably adjust the amount of movement of the valve pin.

The injection molding machine valve device for a multi-cavity mold configured as described above can stably compensate for the deformation force in the vertical direction applied to the valve pin through a buffer means that divides one end of the valve pin and binds it to an elastic body. It provides a useful effect to solve the problems such as increase of maintenance cost due to breakage and deformation of valve pin and decrease of productivity due to equipment downtime.

Description

Elastic valve system for injection molding

The present invention relates to an injection molding machine valve device that integrally controls a plurality of nozzles mounted on a multi-cavity mold with a single driving source, and more particularly, to prevent damage caused by forced lift of a valve pin during solidification of resin in a nozzle. The present invention relates to an injection molding machine valve device for a multi-cavity mold, which can prolong the service life and improve the productivity decrease due to repair.

In general, an injection molding machine for molding a plastic product injects a water support material into a manifold from a mold cylinder in which resin is melted, and the injected resin is distributed evenly along a resin channel branched in the manifold to be coupled to the bottom of the manifold. It is a device that is supplied to each of the at least one nozzle and injected into the cavity of the mold, which is a product forming mold.

The injection molding machine is configured to open and close the gate by the lifting and lowering operation of the valve pin, and in the case of molding several pieces at a time according to the quantity of molded products, a manifold type that receives resin through a manifold is used, and a single product is produced. Single type is used when

1 is a cross-sectional view showing a multi-cavity injection molding machine valve device for elevating the valve pin by using a high-pressure air as the operating pressure according to the prior art.

As shown in the related art, the conventional multi-cavity injection molding machine valve device is composed of a driving unit 100 and the valve device 200 and uses high pressure air as a driving source for the lifting operation of the valve pin 210.

That is, the driving unit 100 is formed with a plurality of air channels (110, 120) which is a pipe for supplying and discharging air of high pressure from the outside, and selectively through the plurality of air channels (110, 120) The piston 140 in the cylinder 130 moves up and down by the high pressure air flowing in. At this time, the lower end of the piston 130 has a structure in which the valve pin 210 is connected and interlocked.

In addition, the valve pin 210 is configured to selectively block or open a gate that forms the front end of the nozzle 220 by being elevated in conjunction with the piston 130.

On the other hand, the valve device 200 includes a nozzle 220 to which the heater is wound to prevent the solidification of the resin by forming an outer body, the valve pin 210 in the nozzle 220 in the vertical direction It is a structure that is installed to achieve lifting. Here, the nozzle 220 is a resin channel 230 is formed with a predetermined gap around the valve pin 210, both ends of the resin channel 230, the gate of the nozzle and the resin channel of the manifold 300 Each structure is connected to the 310.

In the injection molding machine valve device for the multi-cavity mold configured as described above, when a high-pressure operating pressure is selectively supplied through the air channels 110 and 120, the piston 140 moves up or down, and at the same time, the valve pin 210 is interlocked. Lifting operation is performed integrally. Therefore, as the piston 140 is elevated, the gate of the nozzle is opened or shut off, and as a result, the resin supplied through the manifold 300 is supplied into the mold or blocked through the gate.

In summary, the valve gate device for the injection molding machine to operate the air pressure according to the prior art to raise the piston 140 by selectively supplying the high pressure air into the cylinder 130 through the corresponding air channels (110, 120), At this time, in conjunction with the piston 140, the valve pin 210 opens and closes the gate of the nozzle.

However, since the valve device according to the related art configured as described above uses high pressure air as an operation source for elevating the valve pin, it is necessary to adopt an airtight structure to prevent air leakage and a large pneumatic device for supplying the working pressure. As it requires a compressor, the structure is complicated by its volume, which is not only limited to the installation space but also has a disadvantage of extremely poor maintenance and management.

In addition, when applied to a multi-cavity mold having a plurality of nozzles, due to the dimensional dispersion of each nozzle, a deviation occurs in the injection amount of each nozzle, there was a problem that it is difficult to mass-produce a molded article having a uniform quality.

In order to solve such a problem, the applicant has applied for utility model registration No. 2002-09883 (Registration No. 0280604, registration decision), Utility Model Registration Application No. 2002-09884 (Registration No. 0280605, Registration Maintenance Decision), utility Application for registration of utility model No. 2002-09885 (registration No. 0280606, registration maintenance decision), application for utility model registration No. 2002-19175 (registration No. 0290456, registration maintenance decision), application for utility model registration No. 2003-0034932 (registration) No. 0341515 registration maintenance decision, Utility Model Registration Application No. 2003-0038360 (Registration No. 0344137 registration maintenance decision) has proposed a valve device for operating the valve pin in the vertical direction by the power source.

Looking at the configuration of these valve device roughly, the valve body and the drive means is largely composed, the valve body is a resin flow path for injecting the resin into the mold through the gate provided at the tip is formed in general Take the valve structure. As the driving means, a forward / reverse motor or an actuator for raising and lowering the valve pin by power supply is used.

In this way, the applicant's prior application of the valve device is possible to reduce the overall size of the valve device by the structure of employing a forward / reverse motor or an actuator driven by a power supply as a drive source, thereby increasing the degree of freedom in mold design. In addition, the movement amount of the valve pin can be controlled quickly and precisely.

However, the conventional valve device, which the applicant has previously filed, is configured to independently configure the motor or the actuator for each nozzle to control the lifting and lowering of the valve pin for opening and closing the nozzle. When applied to the mold to replace and repair the drive source is not easy to cause workability and productivity degradation, in particular, because the expensive drive source must be employed independently for each nozzle, there was a problem that the manufacturing production price goes up.

In addition, since a plurality of drive sources have operating characteristics, there is a disadvantage that it is difficult to equalize the opening and closing times of each nozzle. To this end, by controlling the operating time of the valve pin by varying the voltage of each drive source, etc. As a result, the opening and closing time of the various nozzles can be adjusted to match, but the work time takes a lot, there is a problem causing a decrease in productivity.

In order to solve this problem, the present applicant has proposed an improved injection molding machine valve device for a multi-cavity mold through Utility Model Registration Application No. 2005-2547 (Registration No. 382589, registration maintenance decision).

Looking at the configuration of the valve device at this time, a plurality of nozzles are formed on the lower surface of the manifold formed a branched resin channel, the upper side of the manifold by the motor having a displacement in the vertical direction, the valve of the nozzle It has a lifting plate to which the upper end of the pin is connected, and consists of a resin pressure adjusting means for adjusting the amount of resin passing through the nozzle.

As described above, the applicant's prior application of the valve device is provided in a plurality of nozzles and the valve pins for opening and closing the gate are connected to the lifting plate to have integral displacement in the vertical direction. Independent adjustments were made to enable mass production of high quality molded parts.

However, the conventional valve device, which is filed by the present applicant, performs an operation of forcibly elevating the valve pin by using a lifting plate. In this case, if the valve pin is forcibly lifted in a state where the resin in the nozzle is solidified, There was a problem that one end of the valve pin is bent or broken.

Therefore, there is a problem such as the increase in maintenance costs due to frequent replacement of the valve pin and a decrease in productivity due to the shutdown of the device.

In addition, the resin pressure adjusting means for adjusting the amount of resin passing through the nozzle has a disadvantage that a high watertightness is required due to its one end is located in the nozzle, and for this purpose, a complex watertight structure must be adopted to reduce maintenance and design. Not only the degree of freedom is limited, but also the packing material for watertightness caused a problem such as reduced productivity due to the hassle that needs to be replaced periodically.

The present invention is devised to solve the above problems, an object of the present invention is to prevent the damage and deformation of the valve pin to compensate for the deformation force generated when the valve pin is raised and lowered in the solidified resin in the nozzle Therefore, to provide an injection molding machine valve device for a multi-cavity mold that can extend the life and reliability of the device.

An injection molding machine valve device for a multi-cavity mold according to the present invention for realizing the above object comprises a manifold having a branched resin channel for injecting a water support material into a multi-cavity mold, and a resin disposed on a lower surface of the manifold. The resin channel supplied is connected to the gate of the front end, and a plurality of nozzles having valve pins of length member for opening and closing the gate by lifting and lowering operation are installed at the inner center, and fixedly installed on the base plate located above the manifold. A forward and reverse motor for rotating the screw shaft protruding toward and a drive means made of a lifting plate coupled to the screw shaft to have a position displacement in the vertical direction in conjunction with the rotation of the screw shaft and the top of the plurality of valve pins connected to one side thereof. In the multi-cavity injection molding machine valve device,

A tubular bushing which is screwed to the lifting plate and has a selective displacement in the vertical direction, and upper ends of the valve pins provided in the bushing are divided into upper and lower parts. And a cushioning means made of upper and lower elastic bodies provided in the bushing to elastically support the upper flange and the lower flange to be in close contact with each other; The pin retracting amount adjusting means further comprising a lifting stopper which is screwed to have a vertical displacement in the up and down direction on one side of the base plate, and the lower end thereof selectively contacts the upper surface of the upper pin to variably adjust the upward movement amount of the valve pin. It is characterized by including the configuration.

As a preferable feature of the present invention, the pin retraction amount adjusting means, the tubular casing is fixed to the base plate; A rotator provided in the casing so as to be rotatable in a forward and reverse direction, and a lifting stopper screwed to a vertical movement in a center thereof; One end of the worm gear is engaged with the outer circumferential surface of the rotator, and the other end is configured to include a control knob which is protruded to the outside to receive a rotation operation force.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are consistent with the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to best explain his or her design. It must be interpreted as meaning and concept.

Hereinafter, a preferred embodiment of a multi-cavity injection molding machine valve device according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing a state in which the gate of the nozzle is blocked in the injection molding machine valve device for a multi-cavity mold according to the present invention, Figure 3 is a cross-sectional view showing a state in which the gate of the nozzle is open.

And, Figure 4 is a cross-sectional view for explaining the action of the buffer means when lifting the valve pin in the state in which the resin in the nozzle is solidified in the multi-cavity injection molding machine valve device according to the present invention, Figure 5 is a resin in the nozzle It is sectional drawing for demonstrating the effect | action of the buffer means when the valve pin is lowered in the solidified state. Finally, Figure 6 is a perspective view of the main part for explaining the shock absorbing means 40 according to the present invention, Figure 7 is a perspective view showing the main configuration of the pin retracting amount adjusting means.

As shown therein, the injection molding machine valve device for a multi-cavity mold of the present invention has a driving means 30 and a valve pin 25 for elevating the manifold 10, the nozzle 20, and the valve pin 25. The buffer means 40 for buffering and absorbing an external force of a predetermined pressure or more is applied, and the pin retraction amount adjusting means 50 for controlling the opening amount of the gate by determining the retraction amount of the valve pin 25.

The manifold 10 has a substantially metal plate shape and is formed in a branched shape of the resin channel 10a through which the water support material in the molten state is moved, and moves along the resin channel 10a on the upper and lower surfaces thereof. In order to prevent the resin from solidifying, a wire-type heater (unsigned), which is a heating element, is embedded.

The manifold 10 has a driving means 30 for elevating the valve pin 25 upwards and a plurality of nozzles 20 for lowering the resin pins and injecting them into the mold.

The nozzle 20 has a cylindrical shape and a member of a length member whose heater wire is wound around its outer circumferential surface, and a resin channel 20a connected to the resin channel 10a of the manifold 10 is formed at the inner center thereof. The channel 20a is connected to a resin outlet, that is, a gate (unsigned), which forms the leading end of the nozzle 20. Although not shown in the drawing, the gate is connected to one end of a mold for molding an injection molded product and is tapered in a form in which the diameter thereof is reduced while being downward.

The nozzle 20 has a configuration in which a heater wire in a wire form is wound in order to prevent the resin passing through the resin channel 20a from solidifying to the outer circumferential surface thereof.

The nozzle 20 is provided with a valve pin 25 of a length member having a smaller diameter than the inner diameter of the resin channel 20a formed at the center thereof, so that resin can flow around the valve pin 25. have. In this case, the valve pin 25 opens and closes the gate by a lifting operation. The upper end of the valve pin 25 passes through the manifold 10 and is connected to the lifting plate 35 of the driving means 30.

The drive means 30 is installed on the base plate 31 spaced apart at regular intervals on the upper side of the manifold 10, the forward and reverse motor 32 for generating a rotational driving force in one direction or the reverse direction, and the forward and reverse motor It is provided with a lifting plate 35 which is connected to the 32 and the screw shaft 33 to form a lift.

That is, the stationary motor 32 is a structure that is fixed to the base plate 31 positioned at a certain distance on the upper side of the manifold (10). The forward and reverse motor 32 is provided with a conventional rotation axis (unsigned) to rotate in the forward and reverse directions selectively by receiving power from the outside, the rotation axis is disposed toward the manifold 10 while the screw shaft 33 is a configuration to be connected.

On the other hand, the screw shaft 33 is configured so that the upper end is connected to the stationary motor 32 receives the driving force, the lower end is rotatably provided on the upper surface of the manifold 10, the screw line is processed to the outer peripheral surface once Structure. The screw shaft 33 is provided in the form of being screwed to the screw hole (unsigned) formed on one side of the elevating plate 35 to elevate the elevating plate 35 by the rotational force of the stationary motor (32). do.

In addition, the elevating plate 35 is a plate-like member is a structure that is connected to the upper end of the plurality of valve pins 25, the screw hole (unsigned) through which the screw shaft 33 is passed in at least one place is formed. It is a structure.

The driving means 30 configured as described above may limit the moving distance of the elevating plate based on the number of revolutions of the motor, or limit the moving distance by sensing by providing various sensing sensors on the upper and lower sides of the elevating plate. There will be. How to limit the moving distance of the lifting plate may be carried out through a variety of known techniques.

Multi-cavity injection molding machine valve device is configured as described above is similar to the conventional structure. However, the injection molding machine valve device for the multi-cavity mold according to the present invention allows the external force in the vertical direction applied to the valve pin 25 to be absorbed and reduced through the buffer means 40, through the pin retraction amount adjusting means 50. It is characterized in that the retraction amount of the valve pin 25 can be adjusted so that the opening and closing amount of the gate can be adjusted.

The shock absorbing means 40 is an upper pin 25a and a lower pin 25b formed by dividing the bushing 41 and the valve pin 25 into two, and the upper pin 25a and the lower pin 25b support each other in close contact with each other. The lower elastic bodies 44 and 45 are comprised.

The bushing 41 is a hollow member having a substantially tubular shape, in which a screw line is processed on an outer circumferential surface thereof so as to be screwed into a screw hole (unsigned) formed in the elevating plate 35. The bushing 41 is provided in such a way that the upper end of the lifting plate 35 is extended to protrude and the outer peripheral surface protruding and expanded is processed into a polygon to be rotated using a tool such as a wrench or wrench. desirable.

When the bushing 41 rotates in one direction or the reverse direction, the bushing 41 moves upwardly or downwardly along the screw line. The bushing 41 expands the internal space in the vertical direction when the upward movement is performed, and reduces the internal space in the vertical direction when the downward movement is performed. do.

The bushing 41 configured as described above has a displacement in the vertical direction by being rotated in one direction or the reverse direction on the elevating plate 35, and one end of the valve pin 25 and upper and lower elastic bodies 44 and 45 are provided therein. do.

The valve pin 25 has a structure in which an upper end portion fitted into the bushing 41 of the elevating plate 35 is divided up and down to form an upper pin 25a and a lower pin 25b.

Here, the upper pins 25a and the lower pins 25b are integrally provided with upper and lower flanges 42 and 43 having an expanded diameter with respect to the divided surface, and the upper and lower flanges 42 and 43 at this time. It is preferable that the diameter of the outer diameter is smaller than the diameter of the inner diameter of the bushing 41.

On the other hand, the upper pin (25a) is a configuration in which the upper end portion is extended to the upper side of the elevating plate 35 as shown in the drawing, the lower end of the elevating stopper 51 of the pin retraction amount adjusting means 50 to be described later It is the structure which contacts and restricts the upward movement.

The upper and lower elastic bodies 44 and 45 are provided in the bushing 41 as described above to elastically support the upper pins 25a and the lower pins 25b. A spring having a coil shape may be used and the nozzle 20 may be used. It causes elastic deformation to a smaller external force than the resin pressure acting on the inside. Among the upper and lower elastic bodies 44 and 45, the upper elastic body 44 is configured to be interposed on the upper side of the upper flange 42 in the bushing 41 as shown in the drawing, and the lower elastic body 45 is shown in the drawing. It is a structure interposed in the bushing 41 below the lower flange 43. Through this configuration, the upper and lower elastic bodies 44 and 45 are elastically supported so that the upper pin 25a and the lower pin 25b, which are movable bodies, may be in close contact with each other.

The shock absorbing means 40 configured as described above has an elastic displacement of the upper and lower elastic members 44 and 45 selectively when the lifting and lowering operation is forcibly performed while the resin in the nozzle 20 is solidified. 25) to compensate for the external force applied.

The pin retraction amount adjusting means 50 is for controlling the amount of resin passing through the gate by limiting the retraction amount of the valve pin 25. The pin retraction amount adjusting means 50 is largely adjusted with the elevating stopper 51, the casing 52, and the rotator 53. It consists of a knob 54.

That is, the pin retracting amount adjusting means 50 is fixed to the installation hole (unsigned) formed in the base plate 31 in a fitting structure, the casing 52 is perpendicular to the center direction Through holes (not shown) are formed, and in order to prevent the rotation of the lifting stopper 51 to be described later, a part of the through holes has a rectangular structure such as a square.

In addition, the inside of the casing 52 is a configuration in which the rotator 53 is rotatably installed while preventing the flow in the up and down directions. At this time, the rotator 53 is the outer circumferential surface is processed in the form of a worm wheel and the center portion is a structure through which a screw hole is formed through the lifting stopper 51 to be described later.

The rotator 53 is in one direction or reverse rotation in conjunction with the control knob 54 receives the operator's operating force.

The adjusting knob 54 is a member of a length member having a predetermined length, one end of which is formed to correspond to the circumference of the rotator 53 in a worm gear manner, and the other end thereof extends to the outside so that the operator can manually Notches are formed on the outer circumferential surface to rotate, or cross grooves are formed to rotate using a tool such as a driver. Although not shown in order to prevent the adjustment knob 54 from flowing in the up, down, left and right directions, it is preferable that the control knob 54 is supported through a bearing support which is a general shaft support.

The elevating stopper 51 is a member of a length member which is screwed to the screw hole of the rotator 53 described above. The elevating stopper 51 is provided to prevent the rotation while being able to move in the up and down direction in conjunction with the rotation of the rotator 53. .

That is, the elevating stopper 51 is a thread line is processed so that the upper outer periphery is screwed to the rotator 53, the lower outer periphery is fitted into the through hole of the casing 52 by the rectangular structure to rotate This is the structure to be prevented.

The lifting stopper 51 of the elevating stopper 51 limits the amount of upward movement of the valve pin 25 by being in contact with the upper surface of the upper pin 25a of the valve pin 25.

When the pin retracting amount adjusting means 50 configured as described above rotates the adjusting knob 54 in one direction or the reverse direction, the rotator 53 rotates in conjunction with this, and as a result, the elevating stopper 51 raises or lowers the valve pin. It is possible to limit the maximum rising position of (25).

Referring to the operation of the multi-cavity injection molding machine valve device of the present invention is configured as described above are as follows.

First, the general opening and closing operation of the nozzle 20 will be described.

As shown in FIG. 2, when power is supplied to the stationary motor 32 in a state in which the nozzle 20 is closed, the lifting plate screwed with the screw shaft 33 connected to the stationary motor 32 rotates in one direction ( 35) up.

Therefore, as the lifting plate 35 is moved upward, the valve pin 25 connected to the lifting plate 35 is also moved upward integrally so that the valve pin 25 opens the gate as shown in FIG. 3. Will be achieved.

In addition, when the forward and reverse motor 32 generates the reverse rotation force in the state where the gate is opened as described above, the screw shaft 33 rotates in the reverse direction in conjunction with this, and as a result, the lifting plate 35 descends and the gate as shown in FIG. 2. Will be blocked.

Second, the operation of the buffer means 40 when the valve pin 25 is raised and lowered while the resin remaining on the resin channel 20a of the nozzle 20 is solidified will be described below.

As shown in FIG. 4, when the resin remaining on the resin channel 20a is solidified while the gate of the nozzle 20 is blocked, the lower pin 25b of the valve pin 25 cannot be moved up by the solidified resin. Done.

When the elevating plate 35 rises in such a state, the bushing 41 screwed to the elevating plate 35 moves upwardly integrally, and the upper pin 25a provided therein is the upper elastic body 44. The state in close contact with the lower pin 25b by the elastic pressing force of the.

Therefore, since the lower pin 25b is in a state where the upward movement is impossible, the lower elastic body 45 is compensated by being compressed by the upward movement distance of the elevating plate 35, and the upper elastic body 44 is reversely extended.

Meanwhile, as shown in FIG. 5, when the resin remaining on the resin channel 20a is solidified while the gate of the nozzle 20 is open, the lower pin 25b of the valve pin 25 is formed on the solidified resin. The descent becomes impossible by this.

When the elevating plate 35 is lowered in such a state, the bushing 41 screwed to the elevating plate 35 descends integrally with the elevating plate 35, and the upper pin 25a provided therein is Since the state of being in close contact with the lower pin 25b is maintained, the upper elastic body 44 is compressed by the lowering moving distance of the elevating plate 35 as a result, and the lower elastic body 25 is expanded in the opposite direction.

Accordingly, in the state where the resin remaining in the resin channel 20a of the nozzle 20 is solidified and the lifting operation of the lower pin 25b is impossible, the upper and lower elastic bodies 44 and 45 are selectively elastically deformed, that is, Compression and extension make it possible to compensate for the external force in the vertical direction applied to the lower pin 25b. In this state, the operator may stop the operation of the device, remove the solidified resin in the nozzle 20, and then restart the device. Therefore, it is possible to prevent the damage and deformation of the valve pin 25 due to the resin.

Third, in the case of controlling the injection amount of the nozzle 20 by changing the retraction amount of the valve pin 25, as shown in FIG. 7, the adjustment knob 54 of the pin retraction amount adjusting means 50 is rotated in one direction. Then, the adjusting knob 54 and the rotator 53 engaged in the worm gear system interlock with each other to achieve one-way rotation, and as a result, the lifting stopper 51 is lowered.

Therefore, as the lifting stopper 51 descends, the maximum raising position of the upper pin 25a in contact with the lower surface of the lifting stopper 51 is lowered with reference to FIG. 2. That is, since the maximum raising position of the valve pin 25 is lowered, the lower end of the lower pin 25b does not completely open the tapered gate, thereby reducing the amount of resin passing through.

The pin retracting amount adjusting means 50 acting as described above may be independently mounted to each nozzle 20 to precisely adjust the amount of resin of the nozzle 20. As a result, the injection amount of the plurality of nozzles 20 is the same. Can be set easily.

On the other hand, the present invention is not limited to the embodiments described, it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the utility model registration claims of the present invention.

The injection molding machine valve device for a multi-cavity mold constructed and operated as described above can stably compensate for the deformation force in the vertical direction applied to the valve pin through a buffer means that divides one end of the valve pin and binds it to an elastic body. Therefore, there is a useful effect that can solve the problems such as the increase in maintenance costs due to breakage and deformation of the valve pin and the decrease in productivity due to the downtime of the device.

In addition, the opening amount of the gate can be controlled by controlling the amount of retraction of the valve pin exposed to the outside, so the structure is simple and does not require a complicated watertight structure, thereby providing an advantage of improving maintenance and reliability of the device.

1 is a cross-sectional view showing an injection molding machine valve device for a multi-cavity mold according to the prior art;

Figure 2 is a cross-sectional view showing an embodiment of a multi-cavity mold injection molding machine valve device according to the present invention,

3 is a cross-sectional view showing an open state of a nozzle in the multi-cavity injection molding machine valve device of FIG.

4 and 5 are cross-sectional views for explaining a state when the valve pin is raised and lowered in a state where the resin in the nozzle is solidified in the injection molding machine valve device according to the present invention,

Figure 6 is an exploded perspective view showing the main configuration of the buffer means applied to the present invention

Figure 7 is a perspective view showing the main configuration of the pin retracting amount adjusting means applied to the present invention.

<Explanation of symbols for main parts of the drawings>

10: manifold 20: nozzle

25: valve pin 25a, 25b: upper and lower pin

30: drive means 31: base plate

32: forward and reverse motor 33: screw shaft

35: lifting plate 40: buffer means

41: bushing 42,43: upper and lower flange

44,45: upper and lower elastic body 50: pin retraction amount adjusting means

51: lift stopper 52: casing

53: Rotator 54: Adjustment Knob

Claims (2)

A manifold 10 having a branched resin channel 10a for injecting a water support material into a multi-cavity mold and a resin channel 20a positioned at a lower surface of the manifold 10 to receive resin are gated at the tip end. Fixed to a plurality of nozzles 20 having a valve pin 25 of a length member for opening and closing a gate by an elevating operation and a base plate 31 positioned above the manifold 10 at an inner center thereof. It is installed and coupled to the screw shaft to have a position displacement in the vertical direction in conjunction with the rotation of the stationary motor 32 and the screw shaft 33 for rotating the screw shaft 33 protruding toward the manifold and a plurality of one side In the multi-cavity mold injection molding machine valve device comprising a drive means 30 of the elevating plate 35 is connected to the upper end of the valve pin, The upper end of the tubular bushing 41 and the valve pin 25 provided in the bushing 41 are screwed to the elevating plate 35 and have a selective displacement in the vertical direction. It is provided in the upper pin 25a, the lower pin 25b and the bushing 41 in which the flanges 42 and 43 are formed on the divided surface to elastically support the upper flange 42 and the lower flange 43 in close contact with each other. Shock absorbing means of the upper and lower elastic bodies (44, 45); Lifting stopper which is screwed to have a vertical displacement in the up and down direction on one side of the base plate 31, the lower end thereof is selectively in contact with the upper surface of the upper pin (25a) to variably adjust the lifting movement amount of the valve pin (25) A pin retraction amount adjusting means having 51); Injection molding machine valve device for a multi-cavity mold, characterized in that further comprises. According to claim 1, The pin retracting amount adjusting means, A tubular casing 52 fixed to the base plate 31; A rotator (53) rotatably provided in the casing (52) in a forward and reverse direction, and the lifting stopper (51) being screwed to enable vertical movement in the center of the casing (52); A control knob 54 having one end engaged with a worm gear on the outer circumferential surface of the rotator 53 and the other end projecting outward to receive a rotation manipulation force; Injection molding machine valve device for multi-cavity mold, characterized in that comprising a.