KR200280604Y1 - Valve system for injection molding - Google Patents

Abstract

The present invention discloses a valve system for an injection molding machine that can control the linear reciprocating operation of the valve pin for opening and closing the valve gate with an electronic actuator, thereby minimizing the device while ensuring the reliability of the operation.

The valve system for the injection molding machine is provided on one side of the manifold and is provided with a resin flow passage through which the resin is passed through the manifold, and a valve body having a gate connected to the resin flow passage at the front end thereof and contacting the cavity of the mold; In the valve system for injection molding machine provided in the center of this valve body and provided with the valve pin which opens and closes a gate by a raise / lower operation,

It is provided on one side of the valve body and the upper and lower coils wound in a cylindrical shape that is selectively energized by control of an externally provided controller, and the magnetic flux of the coils excited and provided in the center of these upper and lower coils It is composed of an actuator consisting of a connecting body which is connected to the valve pin and one end is connected to the valve pin to transmit the upward and downward force by the vertical movement, and the cooling means provided in the actuator to perform heat dissipation by convection and water cooling. .

Description

Valve system for injection molding

The present invention relates to a valve system for an injection molding machine for supplying a resin material for molding an injection molded article. More specifically, the injection molding can be miniaturized while ensuring the reliability of operation by opening and closing the valve gate by an actuator. Relates to a valve system.

In general, a valve system for an injection molding machine is a device which is connected to a cavity to receive resin and injects the resin into the mold, and controls the supply of the resin injected into the mold by intermittently controlling the gate formed at the tip end. The valve system for an injection molding machine is classified into a method of opening and closing a gate by a temperature difference and a method of opening and closing a gate by a valve pin lifting and lowering operation. In recent years, a valve pin opening and closing method is guaranteed. This is being preferred.

1 is a view showing a valve system for a conventional injection molding machine employing the valve pin opening and closing method described above.

As shown therein, the valve system for the injection molding machine is largely composed of a driving unit 100 and a valve body 200. At this time, the driving unit 100 has a plurality of nipples 110 protruding to receive compressed air from the outside. It is a configuration that is formed, the inside is made of an airtight structure for preventing the leakage of compressed air.

The driving unit 100 is provided with a valve pin 120 that is raised and lowered by the compressed air supplied from the outside, the valve pin 120 is extended to the lower side in the resin flow path formed in the valve body 200 And positioned on 210.

On the other hand, the valve body 200 is provided in the form of a common cylinder, the upper end is a configuration that is coupled to maintain the airtight to the drive unit (100). The valve body 200 has a resin flow path 210 for receiving a resin from a cavity (not shown) to guide the mold to the inside of the valve body 200, and the valve pin 120 is connected to the resin flow path 210 at a distal end thereof. A gate 220 is formed at the lower end of the gate 220.

The valve system for a conventional injection molding machine configured as described above opens and closes the gate 220 formed at the end of the valve body 200 while the valve pin 120 is moved up and down by compressed air, and the gate 220 at this time. The resin flowing along the resin flow path 210 by opening and closing is injected into the mold (not shown) or blocked.

However, the valve system for the injection molding machine configured and operated as described above has a problem in that the reliability of the operation is lowered since the valve pin 120 is controlled to move up and down by using pneumatic or hydraulic pressure. That is, since pneumatic or hydraulic pressure is not responsive due to its responsiveness, precise control is impossible, so that opening and closing of the gate 220 of the valve body 200 cannot be controlled quickly and accurately, resulting in a problem that the quality of the injection molded product is not uniform. Cause.

In addition, the valve system for the injection molding machine uses the pneumatic and hydraulic pressure as the operating source of the valve pin 120, there is a disadvantage in that the control of the valve pin 120 is impossible when the operating pressure leaks, preventing the leakage of the operating pressure The airtight structure adopted to increase the overall volume of the valve system for the injection molding machine is not only limited by the installation space but also difficult to replace parts.

The present invention has been made to solve the above problems, the object of the present invention is to control the linear reciprocating operation of the valve pin for opening and closing the valve gate with the actuator to ensure the reliability of the operation while ensuring the miniaturization of the device A valve system for an injection molding machine is provided.

1 is a cross-sectional view showing a valve system for an injection molding machine according to the prior art,

2 and 3 is a cross-sectional view showing a valve system for an injection molding machine according to the present invention,

4 and 5 conceptually showing the operating state of the valve system for injection molding machine according to the present invention,

6 is an exploded perspective view showing main parts of a valve system for an injection molding machine according to the present invention;

7 and 8 are cross-sectional views showing another embodiment of the actuator in the valve system for injection molding machine according to the present invention.

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

10: valve body 11: valve gate

15,25 Resin Euro 20 Manifold

30: actuator 31: upper cover

32: lower cover 33: housing

c1, c2: upper and lower coil 41: operating rod

42: heat transfer blocking shaft 43: valve pin

Valve system for injection molding machine according to the present invention for realizing the above object is provided on one side of the manifold is provided with a resin flow path receiving the resin passed through the manifold, the front end is connected to the resin flow path of the mold In the valve system for an injection molding machine having a valve body having a gate in contact with the cavity and a valve pin provided at the center of the valve body to open and close the gate by a lifting and lowering operation,

It is provided on one side of the valve body and the upper and lower coils wound in a cylindrical shape that is selectively energized by control of an externally provided controller, and the magnetic flux of the coils excited and provided in the center of these upper and lower coils An actuator comprising up and down vertical movements and one end connected to the valve pins to transfer upward and downward forces, and cooling means provided in the actuator to perform heat dissipation by convection and water cooling. It is characterized by being configured.

In the actuator of the present invention, the actuator is a cylindrical housing in which upper and lower coils are wound on an inner circumferential surface, and an upper cover and a lower cover coupled to a lower portion of the housing and having a through hole formed in the center thereof, It is located at the center of the upper and lower coils and forms the polarity by the selective excitation of the upper and lower coils to move vertically in the upper and lower directions by interaction with the upper and lower cores, and one end of the operating rod The other end is connected to the lower end is characterized by consisting of a connecting body consisting of a heat transfer blocking shaft coupled to the upper end of the valve pin through the through hole of the lower cover.

The cooling means of the present invention is formed at intervals on the outer surface of the actuator and the cooling fins for dissipating heat to the atmosphere by convection action, and the cooling water passage provided on the outer body of the actuator and formed so that the cooling water can be circulated It is characterized by

The actuator of the present invention has a cylindrical housing in which a coil is selectively applied from the outside while being wound in an annular shape on an inner circumferential surface thereof, and an operation of vertically moving to one side by being excited at the center of the coil The rod and one end is connected to the lower end of the working rod and the other end is composed of a heat transfer blocking shaft coupled to the upper end of the valve pin, and is provided on one side of the working rod to act as an elastic support force to achieve the position return of the working rod It features a return spring.

Hereinafter, with reference to the accompanying drawings illustrating a preferred embodiment of the valve system for injection molding machine according to the present invention.

2 and 3 are cross-sectional views showing a valve system for an injection molding machine according to the present invention, Figures 4 and 5 is a schematic view showing the operating state of the valve system for an injection molding machine according to the present invention.

And Figure 6 is an exploded perspective view of the main portion showing a valve system for an injection molding machine according to the present invention.

As shown therein, the valve system for the injection molding machine is largely composed of a valve body 10, a manifold 20, and an actuator 30.

Like the valve body 10 for an injection molding machine, the valve body 10 is provided in the form of a cylinder through which a center is penetrated, and a gate 11 for injecting resin into a mold is formed at the front end thereof.

Looking at the configuration of the valve body 10 in more detail, the vertical through-hole 12 which is integrally connected to the gate 11 formed at the front end is formed in the vertical direction at the center thereof, the through-hole 12 at this time ) Is provided with a valve pin 43 in the form of a piston for opening and closing the gate 11 to be movable up and down. In addition, a resin channel 15 connected to the resin channel 25 and the gate 11 of the manifold 20 is formed in the valve body 10.

The valve body 10 configured as described above selectively injects resin moved along the resin flow path into the mold through the gate 11.

The manifold 20 is provided to facilitate the injection of the molten synthetic resin, to form a resin flow passage 25 in a predetermined pattern therein to allow the resin to move, and to the circumference of the resin flow passage 25 Although not shown is a structure in which the heater wire is embedded.

The actuator 30 has a characteristic element of the present invention, the upper and lower covers 31 and 32 and the housing 33 forming an outer body, and the upper and lower coils provided in the housing 33 ( c1), (c2) and connecting body and cooling means.

Here, the housing 33 is a member having a substantially hollow cylindrical shape, coils wound in a ring shape up and down on the inner circumferential surface are disposed up and down, and connected to the center of these coils c1 and c2. It is the structure that a sieve is composed of. The upper and lower surfaces of the housing 33 are shielded by the combination of the upper and lower covers 31 and 32, and the lower cover 32 is disposed at the center so that one end of the connecting body can be exposed to the outside. The through hole is formed.

On the other hand, as shown in Fig. 4 and 5, the upper and lower cores (m1), (upper and lower cores), which are stimulated by excitation of the upper and lower coils c1 and (c2), as shown in Figs. m2) is provided.

The housing 33 and the upper and lower covers 31 and 32 configured as described above are preferably formed of a non-investable material, and the housing 33 and the upper and lower covers 31 and 32 are thus formed. Molding of the non-investment material is to protect the magnetic field of the upper and lower coils (c1, c2) from leaking to the outside to protect other devices installed in close proximity to the actuator 30 from magnetic forces.

Meanwhile, the upper and lower coils c1 and c2 are wound on an outer circumferential surface of a bobbin (not shown) that is provided in a substantially cylindrical shape from the outside, and the wires may be selectively applied by the control of an externally provided controller. do. That is, the upper and lower coils c1 and c2 are configured to selectively apply power only to the upper coil c1 or to restrict the power to only the lower coil c2. The upper and lower cores (m1), (m1) and the connection to form a magnetic pole.

As described above, the upper and lower coils c1 and c2 are selectively excited to move up and down by a predetermined stroke when the connecting body is viewed in the drawing.

The connecting body is composed of a working rod 41 and a connecting body, wherein the working rod 41 is a kind of iron core, and the upper and lower coils c1 and c2 are selectively excited by interaction. It moves up and down.

And the heat transfer blocking shaft 42 is that the heat generated from the valve body 10 and the valve pin 43 in a relatively high temperature state is transferred to the operating rod 41 and the upper and lower coils (c1), (c2). For the purpose of blocking, it is molded of a material having excellent heat transfer blocking. The heat transfer blocking shaft 42 is connected to the upper end of the operating rod 41 by screwing the lower end is exposed to the outside through the through hole of the lower cover is connected to the upper end of the valve pin 43 by screwing to be.

The cooling means is to improve the heat dissipation characteristics of the actuator 30 to prevent deterioration due to heat generation and heat transmitted from the valve body 10, in the present invention, and cooling fins 33b for dissipating heat by convection. And cooling water paths 31a, 32a, 33a for cooling by water cooling.

In more detail, the cooling fins 33b are provided in plural on the outer surface of the actuator 30, that is, on the outer surface of the housing 33, and each cooling fin 33b is convection by such a structure. The action is to quickly release heat into the atmosphere. The cooling fin 33b may be integrally formed with the housing 33 by extrusion.

On the other hand, the cooling water passages (31a), (32a), (33a) is provided in the form of a pipe interconnection between the upper, lower covers (31), (32) and the housing 33, the cooling water is circulated inside The flow causes cooling of the actuator 30. That is, the upper cover 31 has a configuration in which a nipple 31b for supplying and discharging cooling water is formed at one side of the outer circumferential surface, and these nipples 31b have a cooling water passage 31a and a housing 33 of the upper cover 31. The cooling water passage 33a and the cooling water passage 32a of the lower cover 32 are connected to each other.

Reference numeral 40 is a heat insulating material for suppressing the transfer of heat of the valve body 10 to the actuator 30, the reference numeral (l) is a power line applied to the upper and lower coils (c1), (c2) It is shown.

7 and 8 are cross-sectional views showing another embodiment of the actuator in the valve system for injection molding machine of the present invention, as shown in the actuator has a conventional solenoid valve form.

That is, the actuator has a housing 33 which is largely external, and has a coil c wound around the inner circumferential surface of the housing 33 in a ring shape. While having a length, one end thereof is connected to the upper end of the valve pin 43 is provided with a configuration.

At this time, the connecting body is composed of a large operating rod 41 and the heat transfer blocking shaft 42, the heat transfer blocking shaft 42 is the heat transmitted from the valve body and the valve pin 43 in a relatively high temperature state is operated It is to block the transfer to the rod 41 and the coil (c), it is molded of a material that is substantially excellent in heat transfer blocking. The heat transfer blocking shaft 42 is connected to the upper end of the operating rod 41 by screwing and the lower end is exposed to the outside of the housing 33 of the lower cover, and is connected to the upper end of the valve pin 43 by screwing. Configuration.

On the other hand, the actuating rod 41 is configured to receive an elastic support force of the return spring (s) on one side, the return spring (s) at this time to the elastic support force in the upward direction when looking at the actuating rod 41 in the drawing Works.

Although not shown in the figure, the elastic support force of the return spring s moves the valve pin 43 upward, resulting in a state in which the valve gate is opened. That is, a state as shown in FIG. 7 is achieved.

As shown in FIG. 8, the actuator configured as described above has a lower end portion of the actuating rod 41 and a lower end portion of the actuating rod 41 when the power is supplied to the coil c by the excitation force of the coil c. N and S poles are formed in the core m provided on the inner bottom side of the housing 33 opposite to each other. As a result, the operating rod 41 overcomes the elastic support force of the return spring s and moves vertically downward. In this state, the valve pin 41 is interlocked to shield the gate.

Reference numeral 40 is a heat insulating material for suppressing the heat of the valve body 10 is transmitted to the actuator 30.

The operation of the injection molding machine valve system according to the present invention as described above will be described with reference to FIGS. 4 and 5.

First, FIG. 4 illustrates a case where a current is applied to the lower coil c2 of the actuator 30 as shown in the drawing, and the valve pin 43 at this time blocks the gate 11 of the valve body 10. A state is achieved.

That is, when the power is applied to the lower coil c2 under the control of the controller provided outside the actuator 30, and the power is short-circuited to the upper coil c1, the operating rod of the connecting body by the excitation force of the coil ( The lower end of the lower portion 41 and the lower core m2 have N and S polarities to each other, and as a result, the operating rod 41 is moved downward. At this time, since the operating rod 41 is connected to the valve pin 43 through the heat transfer blocking shaft 42 at the lower end thereof, the valve pin 43 also moves downward in association with the operating rod 41 in the drawing. As shown, the gate 11 of the valve body 10 is shielded.

Therefore, the resin moved along the resin flow path 15 formed in the valve body 10 is blocked from being injected outside, that is, into the mold.

On the other hand, Figure 5 shows a case where the current is applied to the upper coil (c1) of the actuator 30, the valve pin 43 at this time is to form a state in which the gate 11 of the valve body 10 is opened. .

That is, the actuator 30 is applied to the upper coil (c1) by the control of the controller provided in the outside, on the contrary, when the power is not applied to the lower coil (c2), the magnetic flux of the upper coil (c1) As a result, the upper end of the operating rod 41 and the upper core m1 have mutually N and S polarities, and as a result, the operating rod 41 moves upward. As a result, the heat transfer blocking shaft 42 and the valve pin ( 43) As it is moved upward, the gate 11 of the valve body 10 is opened as shown in the drawing.

Therefore, the resin moved along the resin flow path 15 formed in the valve body 10 can be injected into the mold through the gate 11.

As described above, the present invention raises and lowers the valve pin 43 by selectively applying power to the upper coil c1 or the lower coil c2 according to the control signal of the controller, so that the gate of the valve body 10 ( 11) Since the opening and closing is interrupted, not only the reliability of the operation is guaranteed but also the valve opening and closing amount can be controlled by adjusting the amount of power applied to each coil.

On the other hand, the actuator 30 is a self-heating by the power is applied to the upper and lower coils (c1), (c2) and the heat transferred from the valve body 10 to the convection action and cooling water of the cooling fin (33b) Since heat is radiated through the cooling water circulating 31a, 32a, and 33a, the performance deterioration of the actuator 30 due to heat can be prevented.

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 system configured and operated as described above controls the up and down movement of the valve pin connected to the connecting body by generating an electromagnetic force, thereby enabling quick and accurate control as compared to the conventional method, thereby improving the quality of the injection molding product. It is effective in reducing defects while making it uniform.

In particular, as compared to the case of using the conventional pneumatic and hydraulic pressure as the driving source, it is possible to greatly reduce the volume of the product while maintaining excellent maintenance, which greatly increases the degree of freedom in the installation and design of the product, as well as ease of maintenance. And the price competitiveness of the product.

Claims (4)

A resin flow passage provided at one side of the manifold and receiving resin passing through the manifold is provided, and a valve body having a gate connected to the resin flow passage at the front end thereof and contacting the cavity of the mold is provided at the center of the valve body. In the valve system for injection molding machine having a valve pin for opening and closing the gate by the lifting and lowering operation, It is provided on one side of the valve body and vertically up and down by the magnetic flux of the coil wound in a cylindrical shape that is selectively energized by the control of the controller provided outside and the coil provided and excited in the center of the coil An actuator configured to be connected to one end connected to the valve pin to transfer the lifting force; Cooling means provided in the actuator to perform a heat radiation action by convection and water cooling; Valve system for injection molding machine, characterized in that comprises a. According to claim 1, The actuator comprises a cylindrical housing in which the coil is wound up and down on the inner peripheral surface; An upper cover coupled to an upper portion of the housing and a lower cover coupled to a lower portion of the housing and having a through hole formed at a center thereof; Upper and lower cores provided on one side of the upper and lower covers to form magnetic poles by selective excitation of upper and lower coils; It is located in the center of the upper and lower coils to form a polarity by the selective excitation of the upper and lower coils to move vertically in the vertical direction in the vertical direction by interaction with the upper and lower cores and one end of the operating rod It is connected to the bottom of the other end is connected to the heat transfer blocking shaft is coupled to the top of the valve pin through the through hole of the lower cover; Valve system for injection molding machine, characterized in that consisting of. The method of claim 1, wherein the cooling means, Cooling fins formed at intervals on an outer surface of the actuator and dissipating heat into the atmosphere by convection; A cooling water passage provided in an outer body of the actuator and configured to circulate the cooling water; Valve system for injection molding machine, characterized in that. According to claim 1, The actuator is wound around the inner circumferential surface and the cylindrical housing is provided with a coil selectively applied to the power from the outside; A connection body comprising a heat transfer blocking shaft positioned at the center of the coil and having an operating rod vertically moved to one side by excitation of the coil and one end connected to the lower end of the operating rod and the other end coupled to the upper end of the valve pin; A return spring provided on one side of the actuating rod and acting an elastic support force to achieve a return of the actuating rod; Valve system for injection molding machine, characterized in that consisting of.