KR200407008Y1 - 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 of the present invention has a manifold formed with a branched resin channel for injecting a water support material into the multi-cavity mold, and a resin channel which is placed on the lower surface of the manifold to receive resin as a gate of the tip end. An injection molding machine valve apparatus for a multi-cavity mold having a plurality of nozzles connected to the inner center and having a valve pin of a length member for opening and closing a gate by a lifting operation, wherein the injection molding machine valve apparatus is spaced apart from an upper side of the manifold and provided to be elevated. The elevating plate connected to the valve pin top of each nozzle and interlocked integrally, and the base plate fixedly installed at intervals above the elevating plate, and the base plate is fixedly installed to generate the lifting force by receiving the working pressure. A pneumatic cylinder having one end of a rod selectively mounted on a lifting plate, and the base plate and a manifold It comprises a drive means consisting of a vertical guide pin is fixed to the fold upper and lower ends and one end passes through the slide hole formed in the elevating plate.

Hot Runner, Manifold, Nozzle, Valve Pin, Motor

Description

Elastic valve system for injection molding

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

2 is a cross-sectional view for explaining the configuration of an injection molding machine for a multi-cavity mold according to the present invention;

3 is a cross-sectional view for explaining the open state of the nozzle in the valve device of FIG.

Figure 4 is a cross-sectional view for explaining the adjustment state using the resin pressure adjusting means in the present invention,

5 and 6 are cross-sectional views for explaining the operating state of the buffer means when the valve pin is raised and lowered in a state where the resin in the nozzle is solidified in 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,

8 is an exploded perspective view showing the main configuration of the shock absorbing means applied to the present invention;

Figure 9 is a block diagram for explaining the resin pressure adjusting means applied to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: manifold 20: nozzle 25: valve pin

30: drive means 31: elevating plate 32: base plate

33: hydraulic pneumatic cylinder 34: vertical guide pin 40: resin pressure adjusting means

41: pressure control pin 42: support 43: control post

50: cushioning means 51: adjustment bushing 52, 53: upper and lower flanges

54, 55: upper and lower elastic body 60: pin retraction amount adjusting means 61: casing

62: elevating stopper 63: rotator 64: adjustment knob

The present invention relates to an injection molding machine valve device for a multi-cavity mold, and more specifically, to control the injection amount of each nozzle individually while intermittently controlling the opening and closing of a plurality of nozzles mounted on the multi-cavity mold using a minimum driving source. The present invention relates to an injection molding machine valve device for a multi-cavity mold, which is suitable for mass production of high-quality mass molded products.

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 which receives resin through a manifold is used and produces a single part. In case of a single type, a single type is used.

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 high pressure air or fluid flowing therein. 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, the valve device according to the related art, which is configured as described above, is configured to have a drive unit, which is a cylinder operated by hydraulic or pneumatic pressure for opening and closing of each nozzle, when applied to a multi-cavity mold, so that the structure is very complicated, and thus a lot of space is provided in the installation space. Not only were they restricted, but they were also extremely poor in terms of maintainability and manageability.

In addition, there is a difficulty in maintaining the air pressure supplied to each drive unit uniformly. As a result, the dimensional distribution of the manifold or the nozzle that provides the flow path through which the resin is moved causes variation in the injection amount of each nozzle, resulting in uniform quality. There was a problem that the mass production of the molded article having a difficult.

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

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. In other words, by controlling the operation time of the valve pin by varying the voltage of each drive source, and as a result, the opening and closing time of the various nozzles can be adjusted to match, but it is not only expensive to use a microcomputer, but also takes a lot of time for initial setting There was this.

The present invention is devised to solve the above problems, the object of the present invention is to operate by matching the opening and closing time by simultaneously controlling the opening and closing of several nozzles applied to the multi-cavity mold using a single or a single hydraulic or pneumatic cylinder The present invention provides an injection molding machine valve device for a multi-cavity mold to improve the reliability of the mold.

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. In a multi-cavity injection molding machine valve device having a plurality of nozzles having a supply valve connected to the gate of the front end of the front end and the valve pin of the length to open and close the gate by the lifting operation in the inner center, the upper side of the manifold A base plate which is spaced apart from each other and is provided to be elevated and connected to the valve pins of the nozzles and is integrally interlocked with each other and the base plate fixedly spaced at an upper side of the lifting plate; A hydraulic pneumatic cylinder which is installed on the base plate and is connected to the elevating plate with one end of the rod selectively mounted to receive the operating pressure to generate the elevating force; It characterized in that it comprises a drive means consisting of a vertical guide pin which is fixed to the base plate and the manifold upper and lower ends and one end passes through the slide hole formed in the elevating plate.

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 and 3 are cross-sectional views for explaining the opening and closing state of the nozzle according to the present invention, Figure 4 is a cross-sectional view for explaining the adjustment state using the resin pressure adjusting means in the present invention, Figures 5 and 6 Is a cross-sectional view for explaining the operating state of the buffer means when the valve pin is raised and lowered while the resin in the nozzle is solidified.

As shown in the figure, the multi-cavity injection molding machine valve device of the present invention, the driving means 30 for raising and lowering the manifold 10, the nozzle 20 and the valve pin 25 and the number of the resin pressure can be adjusted Pin retraction amount adjusting means for varying the gate opening amount by determining the retraction amount of the buffer means 50 and the valve pin 25 to absorb and absorb the external force applied to the acupressure control means 40 and the valve pin 25 ( 60).

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 a molten state is moved, and along the resin channel 10a on the upper and lower surfaces thereof. It is a structure provided with the heater wire (unsigned) which is a heat generating body so that the resin which moves may be solidified. The manifold 10 configured as described above is provided with a driving means 30 for elevating the valve pin 25 upwards, and a plurality of nozzles 20 for lowering the resin and injecting the resin into the mold. Structure.

The nozzle 20 has a cylindrical shape and a member of a length member having a heater wire (unsigned) wound on 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 resin channel 20a is connected to a resin outlet, that is, a gate (unsigned), which forms the tip of the nozzle 20. In this case, the gate is connected to one end of a mold (not shown) for molding an injection molded product and is tapered in a form in which the diameter thereof is reduced. The nozzle 20 has a structure in which a heater wire (unsigned) in the form of a wire 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 configured as described above includes 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. To make it possible. In this case, the valve pin 25 opens and closes the gate by a lifting operation. The upper end of the valve pin 25 is connected to the lifting plate 31 of the driving means 30 by passing through the manifold 10.

The drive means 30 includes an elevating plate 31 for elevating a plurality of valve pins 25 integrally, a base plate 32 fixedly installed at regular intervals above the elevating plate 31, and the base. It is composed of a hydraulic pneumatic cylinder 33 fixedly installed on the plate 32 to create a lifting force and a vertical guide pin 34 to enable a stable lifting of the lifting plate 31.

That is, the pneumatic pneumatic cylinder 33 is a structure that is fixed to the base plate 32 is located at a predetermined distance on the upper side of the manifold 10, such a pneumatic pneumatic cylinder 33 increases the operating pressure of the hydraulic or pneumatic And receiving a pair of air channels (unsigned) for descending to selectively mount the rod 33a. In this case, the rod 33a is vertically disposed, and the lower end thereof is connected to and fixed to one side of the elevating plate 31 to transfer the elevating force to the elevating plate 31.

Here, the rod 33a and the elevating plate 31 may be integrally provided by various coupling structures. For example, the rod 33a and the elevating plate 31 may be integrally provided by welding or the like, or as shown in the drawings, the rod 33a and the lifting plate 31 may be elevated. One side of the steel sheet 31 may be integrally provided through a screw member or an O-ring while being coupled to each other by the fitting structure.

The vertical guide pin 34 is to maintain a stable balance in raising and lowering the elevating plate 31 using a single hydraulic cylinder 33, the upper and lower ends of the base plate 32, respectively It is a structure that is fixedly coupled to the upper surface of the manifold (10), one end of the structure passes through the slide hole (31a) formed in the elevating plate (31). The vertical guide pins 34 are provided at various positions at equal intervals in order to maintain stable lifting of the lifting plate 31. On the other hand, the elevating plate 31 is preferably provided with an oilless bearing (unsigned) on the inner circumferential surface of the slide hole (31a) in order to reduce the frictional resistance with the vertical guide pin 34 during the elevating.

The hydraulic pneumatic cylinder 33 configured as described above is configured to perform the appearance of lifting or lowering the rod 33a by receiving the working pressure as shown in the drawing. Description is omitted.

As shown in FIGS. 2 and 9, the resin pressure regulating means 40 is for adjusting the amount of resin passing through the nozzle 20. The resin pressure adjusting means 40 is provided with one end in the resin channel 10a in a large manner. A pressure regulating pin 41 for adjusting the inner diameter variably to adjust the resin pressure passing through the resin channel, a support 42 for selectively lifting and lowering the other end of the pressure regulating pin 41, and the pressure It is composed of a control post 43 for transmitting the operating force of the operator to the control pin (41).

The pressure control pin 41 is a hollow member having a tubular shape so that the valve pin 25 can pass through the inner center, and the upper end protrudes upward of the manifold 10 and the lower end resin channel 10a. Is located on the diameter reducing portion 10b.

That is, the upper end of the pressure control pin 41 is screwed to the support 42 while being machined to the outer periphery is provided to be elevated by the screw adjustment method, the lower end is tapered to become a small diameter while the outer diameter proceeds downward The diameter reducing portion 10b is located on the diameter reducing portion 10b, where the diameter reducing portion 10b is narrowed in diameter as it is shown in the figure so that the diameter may be reduced when the pressure adjusting pin 41 moves downward. It is tapered into paper, and the minimum diameter of the diameter reducing portion 10b is processed to the same size as the diameter of the resin channel 20a of the nozzle 20.

The support 42 is installed on the manifold 10 to prevent flow through welding or fitting structure, and the like to pass through the upper outer periphery of the pressure adjusting pin 41 through the inner center of the threaded thread. This is processed.

The control post 43 is formed to correspond to the upper outer peripheral edge of the pressure control pin 41 and the worm gear method is formed, the one side so that the operator can rotate using a tool such as a driver Cruciform grooves are formed. The control post 43 is preferably supported by one or more bearings 43b and brackets 43c as shown in FIG. 9 to prevent flow in the up, down, left and right directions.

On the other hand, the pressure control pin 41 is preferably provided with an upper portion of the upper portion that is engaged with the control post 43 and the worm gear in the form of an expanded diameter compared to the lower portion to enable fine adjustment during lifting.

Resin pressure adjusting means 40 is configured as described above when the control post 43 rotates in one direction or in reverse direction, the pressure adjusting pin 41 is moved up and down in the vertical direction. For example, when the adjustment post 43 is rotated in one direction in the state as shown in FIG. 2, the pressure adjusting pin 41 is lowered in association with this to reduce the diameter of the diameter reduction part 10b as shown in FIG. 4. The amount of resin passing through 20 is reduced.

As shown in FIGS. 2 and 8, the shock absorbing means 50 includes an upper pin 25a and a lower pin 25b and an upper pin 25a formed by dividing the adjusting bushing 51 and the valve pin 25 into two. The upper and lower elastic bodies 54 and 55 supporting the lower pins 25b to be in close contact with each other are configured.

The adjusting bushing 51 is a hollow member having a substantially tubular shape, the screw line is processed on the outer circumferential surface to be screwed into the screw hole (unsigned) formed in the elevating plate 31. The adjusting bushing 51 is provided in such a way that the upper end is extended to the upper side of the elevating plate 31 is expanded and the protruding outer peripheral surface is processed into a polygon to be rotated using a tool such as a wrench or wrench. .

The adjusting bushing 51 is configured to move upward or downward along a screw thread when rotated in one direction or reverse direction, and expands an internal space in a vertical direction when moved upward, and moves in a vertical direction when moved downward. Allow the interior space to shrink.

The valve pin 25 has a structure in which an upper end portion fitted into the adjusting bushing 51 of the elevating plate 31 is divided into upper and lower portions to form an upper pin 25a and a lower pin 25b. Here, the upper pin 25a and the lower pin 25b are integrally provided with upper and lower flanges 52 and 53 of which a diameter is expanded based on the divided surface, and the upper and lower flanges 52 and 53 at this time. It is preferable that the diameter of the outer diameter is formed smaller than the diameter of the inner diameter of the adjusting bushing (51). 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 31 as shown in the drawing, on the bottom surface of the elevating stopper 62 of the pin retraction amount adjusting means 60 to be described later It is the structure which contacts and restricts the upward movement.

The upper and lower elastic bodies 54 and 55 are provided in the above-described adjustment bushing 51 to elastically support the upper pin 25a and the lower pin 25b, and a spring in the form of a conventional coil may be used, and the nozzle 20 It causes elastic deformation to an external force that is less than the resin pressure acting on the inside. Among the upper and lower elastic bodies 54 and 55, the upper elastic body 54 is configured to be interposed on the upper side of the upper flange 52 in the adjusting bushing 51, and the lower elastic body 55 is illustrated in the drawing. Looking at it is the structure interposed in the lower side of the lower flange 53 in the adjustment bushing 51. As shown in FIG. Through this configuration, the upper and lower elastic bodies 54 and 55 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 50 configured as described above has an elastic displacement of the upper and lower elastic bodies 54 and 55 selectively when the lifting and lowering operation is forcibly performed while the resin in the nozzle 20 is solidified. 25) is prevented from being broken in the fixed position by the resin solidification.

As shown in FIG. 2 and FIG. 7, the pin retraction amount adjusting means 60 is for controlling the amount of resin passing through the gate by limiting the upward movement amount of the valve pin 25, that is, the retraction amount. It may be used in parallel with the resin pressure adjusting means 40 or may be optionally used. The pin retraction amount adjusting means 60 is composed of a lifting stopper 62, a casing 61, a rotator 53 and an adjusting knob 54. That is, the pin retracting amount adjusting means 60 is installed in a casing 61 is fitted into the installation hole (unsigned) formed in the base plate 32, the casing 61 is perpendicular to the center direction Through holes (not shown) are formed, and in order to prevent the rotation of the lifting stopper 62 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 61 is a configuration in which the rotator 63 is rotatably installed while preventing the flow in the up and down directions. At this time, the rotator 63 is the outer circumferential surface is processed in the form of a worm wheel, the central portion is a screw hole (unsigned) is formed through the structure is a screw fastening stop 62 to be described later. The rotator 63 is in one direction or reverse rotation in conjunction with the control knob 64 receives the operator's operating force.

The adjusting knob 64 is a member of a length member having a predetermined length, one end of which is formed to correspond to the circumferential surface of the rotator 63 in a worm gear manner, the other end of which extends to the outside to the operator Notches are formed on the outer circumferential surface so as to be rotated, or cross grooves are formed to be rotated using a tool such as a driver. Although not shown in order to prevent the adjustment knob 64 from flowing in the up, down, left, and right directions, the control knob 64 is supported through a support such as a bearing and a bracket or the like for supporting the adjustment post in the above-described resin pressure adjusting means 40. It is desirable to be.

The elevating stopper 62 is a member of a length member which is screwed to the screw hole of the rotator 63 described above, in conjunction with the rotation of the rotator 63 can be moved in the up and down direction while being prevented from rotating. do. That is, the elevating stopper 62 is threaded so that the upper outer periphery is screwed to the rotator 63, the lower outer periphery is fitted into the through hole of the casing 61 by the rectangular structure to rotate This is the structure to be prevented. The lifting stopper 62 limits the amount of upward movement of the valve pin 25 by the lower surface of the elevating stopper 62 being in contact with the upper surface of the upper pin 25a of the valve pin 25.

When the pin retracting amount adjusting means 60 configured as described above rotates the adjusting knob 64 in one direction or the reverse direction, the rotator 63 rotates in conjunction with this, and as a result, the lifting stopper 62 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 opening and closing operation of the nozzle, when the valve pin 25 is lowered as shown in Figure 2 when the rising operating pressure is supplied to the hydraulic cylinder 33 in a state in which the gate of the nozzle 20 is closed, the hydraulic cylinder 33 The rod 33a of) increases and moves the lifting plate 31 upward. Therefore, as the lifting plate 31 is moved upward, the various valve pins 25 connected to the lifting plate 31 are moved upward to achieve an open state as shown in FIG. 3. At this time, when the elevating plate 31 is moved upward to a certain height, the upper surface of the valve pin 25 is in contact with the elevating stopper 62 of the pin retraction amount adjusting means 60 is restricted movement.

In addition, when the lowering operating pressure is supplied to the pneumatic pneumatic cylinder 33 while the gate is open as described above, the lifting plate 31 is lowered in association with the valve pin 25 to block the gate as shown in FIG. 2. Is achieved.

Second, in the case of controlling the amount of resin passing through the nozzle 20 by changing the diameter of the resin channel, that is, the injection amount, the adjustment post 43 of the resin pressure adjusting means 40 is rotated in one direction as shown in FIG. 3. In this case, the control post 43 and the pressure control pin 41 interlocked in the worm gear system interlock with each other to move downward in one direction.

Therefore, as the pressure regulating pin 41 descends, the interval between the diameter reduction parts 10b is narrowed as shown in FIG. 4, so that the resin passage amount can be reduced. On the contrary, when the adjusting post 43 is rotated in the reverse direction, the pressure adjusting pin 41 moves upward, thereby expanding the diameter of the diameter reducing part 10b, and consequently, the resin passing amount is increased.

The resin pressure adjusting means 40 acting as described above can be independently mounted to each nozzle 20 to precisely adjust the resin amount of the nozzle 20. As a result, the injection amount of the plurality of nozzles 20 can be easily adjusted under the same conditions. Can be set.

Third, the operation of the buffer means 50 when the valve pin 25 is elevated in the state where the resin remaining on the resin channel 20a of the nozzle 20 is solidified will be described below.

As shown in FIG. 5, 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 upward by the solidified resin. Done.

When the elevating plate 31 is raised in such a state, the adjusting bushing 51 screwed to the elevating plate 31 moves upwardly integrally, and the upper pin 25a provided therein is the upper elastic body 54. It keeps 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 in which the upward movement is impossible, the lower elastic body 55 is compensated by being compressed by the upward movement distance of the elevating plate 31, and the upper elastic body 54 is extended in the opposite direction.

On the contrary, as shown in FIG. 6, 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 solidified resin. The descent becomes impossible.

When the elevating plate 31 is lowered in such a state, the adjusting bushing 51 screwed to the elevating plate 31 descends integrally with the elevating plate 31, and the upper pin 25a provided therein. Is maintained in intimate contact with the lower pin 25b, and as a result, the upper elastic body 54 is compensated by being compressed by the lowering moving distance of the elevating plate 31, and the lower elastic body 55 is extended in the opposite direction.

Therefore, 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 54 and 55 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.

Fourth, in order to control the injection amount of the nozzle 20 by changing the retraction amount of the valve pin 25, first, the adjustment knob 64 of the pin retraction amount adjusting means 60 is rotated in one direction or in the reverse direction. Then, the adjusting knob 64 and the rotator 63 interlocked in the worm gear system are interlocked with each other, and as a result, the lifting stopper 62 moves downward or upward. Therefore, the lifting stopper 62 is lowered so that the maximum raising position of the upper pin 25a constituting the upper end of the valve pin 25 in contact with the lower surface of the lifting stopper 62 can be variably adjusted. That is, by allowing the variable up position of the valve pin 25 to be variably adjusted, the lower end portion of the valve pin 25 affects the amount of opening of the gate of the tapered nozzle 20 so that the amount of resin can be adjusted. Will be done.

The pin retracting amount adjusting means 60 acting as described above may be independently mounted to each nozzle 20 to precisely adjust the amount of resin of the corresponding nozzle 20, and as a result, the injection amount of the plurality of nozzles 20 is the same condition. 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 has a structure for lifting and lowering a lifting plate connected to valve pins provided at a plurality of nozzles by using a pneumatic cylinder widely used in a conventional valve device as a single driving source. Therefore, it is possible to simplify the structure to minimize the installation constraints, there is an advantage that can solve the problem of molding defects due to the non-uniformity of the nozzle opening and closing time.

In addition, the resin injection amount of each nozzle can be precisely adjusted by precisely adjusting the resin injection amount of each nozzle through the resin pressure adjusting means and the pin retracting amount adjusting means, resulting in high quality and mass production of molded products. In addition, the buffer means prevents damage to the valve pin due to the lifting force applied in the solidified state, thereby providing an industrially useful effect that can greatly increase the reliability of the device.

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. In the injection molding machine valve device for a multi-cavity mold having a plurality of nozzles 20 having a valve pin 25 of the length member connected to the inner and the center by the lifting operation to open and close the gate, Spaced on the upper side of the manifold (10) is provided with a lifting plate and connected to the upper end of the valve pin (25) of each nozzle 20 and integrally interlocked with the interval of the lifting plate 31 A base plate 32 which is fixed and installed; A hydraulic pneumatic cylinder (33) having one end of the rod (33a) which is selectively installed in the base plate (32) by being supplied with an operating pressure to generate a lifting force and which is selectively mounted on the base plate (32); Driving means 30 composed of vertical guide pins 34 having upper and lower ends fixed to the base plate 32 and the manifold 10 and having one end passing through a slide hole 31a formed in the elevating plate 31. Injection molding machine valve device for a multi-cavity mold comprising a. According to claim 1, wherein the valve pin 25 passes through the inner center to adjust the amount of resin passing through the nozzle 20, the upper end of which is provided by the adjustment of the screw while the lower diameter of the resin channel The support 42 and the support are provided on the pressure control pin 41 and the upper surface of the manifold 10 is located on the reduced diameter reduction portion (10b) to be reduced and passed through a screwed portion of the upper end of the pressure control pin (41) A resin pressure adjusting means (40) having an adjusting post (43) interlocked with the worm gear system on the outer circumference of the upper end of the pressure adjusting pin (41) protruding upwardly to receive the operating force; The upper and lower ends of the tubular control bushing 51 and the valve pin 25 provided in the control bushing 51 are screwed to the lifting plate 31 and have a selective displacement in the vertical direction. The upper and lower flanges (25a) and the lower pins (25b) and the upper and lower flanges (25a) and the upper and lower flanges (52, 53) formed on the divided surface to extend to the inner circumferential surface of the control bushing 51, the upper flange ( 52 and cushioning means (50) made of upper and lower elastic bodies (54, 55) elastically supporting the lower flange (53) in close contact with each other; By variablely adjusting the amount of movement of the valve pin 25, the tubular casing 61 fixed to the base plate 32 and the casing 61 are rotatably provided in a forward and reverse direction and have an inner center thereof. Rotator 63 is screwed to the vertical movement of the elevating stopper 62 selectively contacting the upper surface of the valve pin 25 and one end is engaged with the worm gear on the outer peripheral surface of the rotator 63 and the other end is projected outward A pin retraction amount adjusting means (60) consisting of a control knob (64) for receiving rotational manipulation force; Injection molding machine valve device for a multi-cavity mold, characterized in that further comprises.

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