KR200280605Y1 - Valve system for injection molding - Google Patents

Abstract

The present invention discloses a valve device for an injection molding machine.

The valve device for the injection molding machine is provided with a cylindrical coil which is excited by selectively receiving power from the outside on the inner circumferential surface of the cylindrical casing, and an operating rod for vertically moving up and down by magnetic flux of the coil is provided at the center of the coil. An actuator; Cooling means for dissipating heat generated by the actuator to the outside; The space is provided inside the space is provided with the actuator is formed on one side of the space is formed in the resin flow path and the resin wire flows embedded around the resin flow path and the front end and the resin flow path is formed at the one end A valve body comprising a gate connected thereto; One end is connected to the actuating rod of the actuator and the other end is located on the gate through a through hole connecting the gate and the space portion in which the actuator is installed, and is connected to the resin flow path and the gate in conjunction with the vertical movement of the actuating rod. Means.

Description

Valve system for injection molding {Valve system for injection molding}

The present invention relates to a valve device for an injection molding machine, and more particularly, to a valve device for an injection molding machine to electronically control the operation of the valve pin to ensure the reliability of the gate opening and closing, and at the same time it can be miniaturized.

In general, a valve device for an injection molding machine is a device for receiving resin from a mold cylinder in which resin is melted and injecting the resin into a cavity of a mold. The valve device for an injection molding machine is configured to open and close a gate by lifting and lowering a valve pin. Depending on the number of molded articles, a plurality of molds can be roughly classified into a manifold type in which resin is supplied through a manifold, and a cylinder type in which resin is supplied from a cylinder when a single product is produced.

1 is a cross-sectional view showing a valve device of a type in which resin is supplied from a cylinder in an injection molding machine according to the prior art.

As shown therein, the valve apparatus for an injection molding machine according to the prior art is largely composed of a driving unit 100 and a valve body 200. At this time, the driving unit 100 includes a plurality of nipples to receive compressed air from the outside. 110 is formed to protrude, the inside is made of an airtight structure for preventing the leakage of compressed air.

The drive 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 cylinder (not shown) to guide the mold to the inside of the valve body 200, and a valve pin 120 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 device 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, since the valve device for the conventional injection molding machine configured as described above controls the raising and lowering operation of the valve pin 120 by using pneumatic or hydraulic pressure, the responsiveness of the valve pin 120 is relatively slow and There is a problem of low reliability.

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 device for the injection molding machine has a disadvantage in that it is impossible to control the valve pin 120 when the operating pressure leaks because it uses pneumatic and hydraulic pressure as the operating source of the valve pin 120, preventing the leakage of the operating pressure The airtight structure adopted to increase the overall volume of the valve device for the injection molding machine is very complicated and there is a problem that not only the installation space is limited but also the replacement of parts is not easy.

The present invention was devised to solve the above problems, and an object of the present invention is to promptly control the linear reciprocating operation of the valve pin in a valve device that receives resin from a cylinder, and to quickly and easily respond to gate opening and closing. The present invention provides a valve device for an injection molding machine which can accurately and compactly size the device.

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

2 and 3 are a perspective view and a cross-sectional view showing a first embodiment of the valve device for injection molding machine according to the present invention;

4 and 5 are a perspective view and a cross-sectional view showing a second embodiment of the valve device for injection molding machine according to the present invention;

6 and 7 are a perspective view and a cross-sectional view showing a third embodiment of the valve device for injection molding machine according to the present invention.

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

10 valve body 11: resin flow path

12: gate 13: installation hole

20: actuator 21: casing

21a: cooling fin 22: coil

23: coolant 30: working rod

31: connecting rod 32: valve pin

h: heater wire

In the valve device for injection molding machine according to the present invention for realizing the above object, the cylindrical casing inner circumferential surface is provided with a cylindrical coil that is selectively energized from the outside, the center of the coil by the magnetic flux of the coil An actuator provided with an operating rod for vertically moving up and down; Cooling means for dissipating heat generated by the actuator to the outside; The space is provided inside the space is provided with the actuator is formed on one side of the space is formed in the resin flow path and the resin wire flows embedded around the resin flow path and the front end and the resin flow path is formed at the one end A valve body comprising a gate connected thereto; One end is connected to the actuating rod of the actuator and the other end is located on the gate through a through hole connecting the gate and the space portion in which the actuator is installed, and is connected to the resin flow path and the gate in conjunction with the vertical movement of the actuating rod. Characterized in that constituted by means.

The actuator of the present invention is characterized in that it is a solenoid.

The cooling means of the present invention is provided with a plurality of protrusions formed at intervals on the outer surface of the cylindrical casing and cooling fins for releasing heat into the atmosphere by convection, and the casing is provided in the form of a pipe and the cooling water is circulated therein. It is characterized by consisting of a cooling water to perform heat radiation.

The connecting means of the present invention is connected to one end is connected to the operating rod and the connecting rod made of insulation, the other end is connected to the other end of the connecting rod, the other end is located on the gate through the through-hole interlocked with the operating rod It is characterized by consisting of a valve pin to selectively open and close the gate.

The connecting means of the present invention is connected to the one end is connected to the operating rod and the connecting rod made of a heat insulating material, one end is located on the gate and the other end and the valve pin is located on the space portion the actuator is installed through the through hole and Both ends of the slits are hingedly coupled to the other end of the connecting rod and the other end of the valve pin, respectively, and are characterized by consisting of a link provided to be rotated about its center in a bent shape several times.

The connecting means of the present invention, one end is connected to the working rod is connected to the connecting rod made of a heat insulating material, one end is connected to the other end of the connecting rod and a rack gear rod formed on one side of the other end, A pinion gear rotatably installed at one side of the rack gear rod and having an outer circumference interposed with the rack gear, one end of which is positioned on the gate, and the other end of which extends to a position facing the rack gear rod through a through hole; Its end is characterized by consisting of a valve pin with a rack gear engaged with the pinion gear.

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

2 and 3 are cross-sectional views showing a first embodiment of the valve device for injection molding machine according to the present invention.

As shown in the figure, the valve device for injection molding machine is largely composed of an actuator 20, a cooling means, a valve body 10, and a connecting means.

The actuator 20 is provided with a cylindrical casing 21, the inner surface of the casing 21 is provided with a pair of coils 22 up and down as shown in the drawing, the center of these coils 22 The operating rod 30 is provided to be movable up and down. At this time, the working rod 30 is configured such that the lower end thereof is exposed to the outside of the casing 21.

That is, the upper and lower coils 22 are wound in a substantially annular shape and are disposed up and down around the operating rod 30, and the center of the upper and lower coils 22 generates magnetic flux by selectively applying power from the outside. The operating rod 30 provided in the to move in the upward or downward direction.

The actuator 20 is similar to the configuration of a conventional solenoid, and the casing 21 is formed of a non-investable material to block the magnetic field of the coil 22 from leaking to the outside, which is installed close to the actuator 20. It is desirable to be made to protect other devices from magnetic forces.

On the other hand, the actuator 20 has a cooling means for cooling the heat generated from the self-heating and the valve body 10 by the convection action and water cooling.

The cooling means is to prevent the performance deterioration due to deterioration by improving the heat dissipation characteristics of the actuator 20, in the present invention, the cooling fin 21a for performing heat dissipation by convection action, and the circulation flow of the cooling water. It is provided to the cooling water passage 23 for the cooling action by.

In more detail, the cooling fin 21a is a configuration in which a plurality of cooling fins 21a are provided in the form of a wide plate on a surface such that a smooth convection is performed at a predetermined interval on the outer surface of the casing 21 of the actuator 20. The structure allows each cooling fin 21a to perform a cooling action to quickly release heat transferred to the casing 21 into the atmosphere. These cooling fins 21a can be molded by extrusion integrally with the casing 21.

On the other hand, the cooling water passage 23 is a kind of pipe that is formed to circulate the casing 21, and the cooling water is circulated in the inside to perform a cooling action on the actuator 20. The cooling water circulating through the cooling water passage 23 is supplied and drained through a tube protruding from the upper end of the casing 21.

As described above, the actuator 20 including the cooling means is installed in the space provided in the valve body 10 in a predetermined size.

The valve body 10 forms a space portion having a predetermined size so that the above-described actuator 20 can be installed, and the resin flow passage 11 is formed in a direction perpendicular to one side of the space portion. Although not shown in the drawing, the resin flow path 11 is configured to receive molten resin from a cylinder, and has a structure in which a heater wire h, which is a heating element that generates heat at a predetermined temperature by power supply, is embedded around the resin flow passage 11. Such a resin flow passage 11 is connected with a gentle inclination angle from the lower end side of the valve body 10 to the gate 12 side.

On the other hand, the valve body 10 is provided with a through hole 13 for connecting the space portion in which the gate 12 and the actuator 20 is installed, the through hole 13 is a valve pin of the connecting means to be described later 32 is positioned to interrupt the opening and closing of the gate 12.

The connecting means is a member that intermittently opens and closes the opening and closing of the gate 12 in association with the operation rod 30, and is composed of a connecting rod 31 and a valve pin 32, wherein the connecting rod 31 is As the upper end is screwed to the lower end of the operation rod 30 to be interlocked, it is suppressed that the heat of the valve body 10 is transmitted to the actuator 20 by being formed of a heat insulating material having excellent heat insulating performance. The upper end of the valve pin 32 is screwed to the lower end of the connecting rod 31 is interlocked integrally, the lower end is made of a structure extending through the through hole 13 to the gate 12 side.

The connection means made in this way is that when the actuating rod 30 of the actuator 20 is moved up and down by the magnetic flux of the coil 22, as a result of the up and down movement in the same direction in conjunction with this, the valve pin ( 32 performs an operation of opening and closing the gate 12.

4 and 5 are a perspective view and a cross-sectional view showing another embodiment of the connecting means in the valve device for injection molding machine according to the present invention.

As shown in the drawing, the connecting means includes a connecting rod 31 formed of a material having excellent heat insulating performance, and a valve pin 32 connected to the connecting rod 31 and the link 33.

That is, the connecting rod 31 is the upper end is coupled to the lower end of the operating rod 30 by screwing, the lower end is a configuration that is hinged to one end of the link (33). In addition, the valve pin 32 is the lower end is located on the gate 12 and the upper end is located in the space in which the actuator 20 is installed through the through hole 13 is hinged to the other end of the link 33 to be. At this time, the link 33 is a member that is bent several times, and is configured to be hinged so as to be rotated about its center, and one end of the connecting rod 31 and the valve pin 32 are formed at both ends of the slit 33a. It is a hinged configuration.

The connection means made in this way is connected to the connection rod 31 when the operation rod 30, ascending and descending to achieve a vertical movement. At this time, the valve blood connected to the connecting rod 31 and the link 33 is interlocked in a direction opposite to the moving direction of the operating rod 30 to perform the opening and closing operation of the gate 12.

8 and 7 are a perspective view and a cross-sectional view showing another embodiment of the connecting means in the valve device for injection molding machine according to the present invention.

As shown therein, the connecting means comprises a connecting rod 31, a rack gear rod 34, a pinion gear 35 and a valve pin 32 made of a heat insulating material.

That is, the connecting rod 31 is formed of a heat insulating material excellent in heat insulating performance, the upper end is coupled to the lower end of the operating rod 30 of the actuator 20 by screwing, the lower end of the rack gear rod 34 The top is screwed together. At this time, the rack gear rod 34 is a rack gear is formed on one side, the rack gear is configured to engage with the pinion gear 35 is installed so as to rotate freely. Meanwhile, the upper end of the valve pin 32 is positioned at the position facing the rack gear rod 34 with the pinion gear therebetween, and the upper end of the valve pin 32 is engaged with the pinion gear 35 at this time. The rack gear is formed, the lower end of the configuration is positioned on the gate 12 through the through hole (13).

Connection means made in this way is the connection rod 31 and the rack gear rod 34 when the operation rod 30 is moved up and down to achieve a vertical movement in conjunction with this. At this time, since the rack gear rod 34 is engaged with the pinion gear 35, the pinion gear 35 is rotated in the forward and reverse directions, and the valve pin 32 engaged with the pinion gear 35 is operated. The gate 30 is moved in a direction opposite to the moving direction of the rod 30 to perform the opening and closing of the gate 12.

As described above, the valve device for injection molding machine according to the present invention can control the opening and closing of the gate 12 of the valve body 10 by raising and lowering the operation rod 30 of the actuator 20 by selective power supply. Since it is possible to ensure the reliability of the operation, it is possible to precisely control the valve opening and closing amount by adjusting the amount of power applied to the coil 22.

On the other hand, the actuator 20 can ensure a stable heat dissipation performance by the cooling fin 21a and the cooling water passage 23 provided in the casing 21, as a result can prevent the damage of the device due to overheating in advance. Will be.

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.

In the valve device for injection molding machine configured and operated as described above, an actuator supplied with power from the outside selectively moves the operation rod vertically within a predetermined section, and the valve pin is interlocked by the operation of the operation rod to open and close the gate. Since it is intermittent, the response speed of a valve pin can be improved compared with the past, and the quality of an injection molded product can be improved.

In particular, compared to the case of using the pneumatic and hydraulic pressure as the driving source, the structure can be simplified while greatly reducing the volume of the product, thereby significantly reducing the production cost and greatly increasing the degree of freedom in the installation and design of the product. It can provide a very useful effect in the industry.

Claims (6)

An actuator provided with a cylindrical coil, which is selectively applied with power from the outside, on an inner circumferential surface of the cylindrical casing, and an actuating rod provided at the center of the coil to vertically move up and down by magnetic flux of the coil; Cooling means for dissipating heat generated by the actuator to the outside; The space is provided inside the space is provided with the actuator is formed on one side of the space is formed in the resin flow path and the resin wire flows embedded around the resin flow path and the front end and the resin flow path is formed at the one end A valve body comprising a gate connected thereto; One end is connected to the actuating rod of the actuator and the other end is located on the gate through a through hole connecting the gate and the space portion in which the actuator is installed, and is connected to the resin flow path and the gate in conjunction with the vertical movement of the actuating rod. Way; Valve device for injection molding machine, characterized in that consisting of. The valve apparatus according to claim 1, wherein the actuator is a solenoid. The cooling apparatus of claim 1, wherein the cooling means comprises: cooling fins protruding from the outer surface of the cylindrical casing and releasing heat into the atmosphere by convection; A cooling water passage provided in the form of a pipe in the casing and dissipating heat by circulating cooling water therein; Valve device for injection molding machine, characterized in that consisting of. The method of claim 1, wherein the connecting means, A connecting rod having one end connected to the working rod and interlocked with the insulating rod; A valve pin having one end connected to the other end of the connecting rod, the other end of which is positioned on the gate through a through hole to selectively open and close the gate in association with the operation rod; Valve device for injection molding machine, characterized in that consisting of. The method of claim 1, wherein the connecting means, A connecting rod having one end connected to the working rod and interlocked with the insulating rod; A valve pin having one end positioned on the gate and the other end positioned on a space portion in which an actuator is installed through a through hole; A link provided at both ends of the slit, the other end of the connecting rod and the other end of the valve pin are hinged and rotated about its center in a bent shape several times; Valve device for injection molding machine, characterized in that consisting of. The method of claim 1, wherein the connecting means, A connecting rod having one end connected to the working rod and interlocked with the insulating rod; A rack gear rod having one end connected to the other end of the connecting rod and having a rack gear formed at one side of the other end thereof; A pinion gear rotatably installed at one side of the rack gear rod and having an outer circumference engaged with the rack gear; A valve pin having one end positioned on the gate and the other end extending through the through hole to face the rack gear rod, the extended end having a rack gear engaged with the pinion gear; Valve device for injection molding machine, characterized in that consisting of.