KR200290456Y1 - 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 formed with a resin flow path through which the resin supplied from the outside is moved around the space portion formed at the inner center, and a nozzle having a gate connected to the space portion and the resin flow passage to discharge the resin is provided. A valve body, a motor installed in the space of the valve body, and receiving power from the outside to selectively generate rotational force in the forward and reverse directions, and connected to an output terminal of the motor to reduce the torque while receiving the rotational force and decelerating. And a planetary gear body for rotating the rotating shaft screwed on the outer circumference, and a portion of the upper end is screwed to the rotating shaft, and the lower end is extended on the gate, and the upper end moves linearly in the axial direction during forward and reverse rotation of the rotating shaft. It consists of a valve pin for opening and closing the gate.

Description

Valve system for injection molding

The present invention relates to a valve device for an injection molding machine, and more particularly, for an injection molding machine to increase the torque of the motor providing the raising and lowering power of the valve pin, thereby enabling miniaturization and improving response and reliability. It relates to a valve device.

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 conventional injection molding machine using hydraulic pressure.

As shown therein, the valve apparatus for the injection molding machine according to the prior art is largely composed of a driving unit 100 and a valve body 150. 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 150 160 is located on.

On the other hand, the valve body 150 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 150 has a resin flow path 160 for receiving resin from a cylinder (not shown) to guide the mold to the inside of the valve body 150, and a valve pin 120 connected to the resin flow path 160 at a distal end thereof. A gate 170 at which the lower end of the gate is located is formed.

The valve device for a conventional injection molding machine configured as described above opens and closes the gate 170 formed at the end of the valve body 150 while the valve pin 120 moves up and down by compressed air, and the gate 170 at this time. The resin flowing along the resin flow path 160 by opening and closing is injected into the mold (not shown) or blocked. Reference numeral (h) is a heater that is a heating element for preventing the solidification of the resin passing through the resin channel 160, (c) shows a cover.

However, since the valve device configured as described above controls the raising and lowering operation of the valve pin 120 using hydraulic pressure or pneumatic pressure, not only the response is slow but also the reliability of the operation is low. Due to the disadvantage that the bulky by adopting the airtight structure to be had a problem that the installation space is restricted a lot.

In order to solve this problem, the present applicant has proposed a valve device for controlling the valve pin through a drive motor using a power source through the utility model registration application 1502-9885.

This valve device is largely composed of a valve body and a drive means as shown in FIG.

The valve body 200 has a structure in which a resin flow path 210 is formed to receive resin therein and to be injected into a mold through the gate 221 of the nozzle 220 provided at the tip portion, and the resin flow path 210 is formed. The heater h which is a heating element is provided in the circumference | surroundings. In addition, the gate 221 and the resin flow path 210 is configured to communicate with each other, the gate 221 at this time vertically upwards when viewed from the drawings so that the valve pin 230 can achieve the lifting, lowering operation. It is connected to the extended long hole.

The driving means is composed of the forward and reverse motor 240, the lead screw 250 and the valve pin 230, the forward and reverse motor 240 is the resin flow path 210 of the valve body 200 It is a configuration installed in one side space portion formed. The forward / reverse motor 240 rotates the output shaft in the forward / reverse direction by receiving power, and at this time, the lead shaft 250 having a screw formed on the outer circumference is connected to the shaft, or the screw is attached to the rotating shaft itself. It is formed, the outer periphery of the output shaft formed with this screw is a structure that is connected to the upper end of the valve pin 230 of approximately "??" shape is linearly moved.

On the other hand, the lower end of the valve pin 230 is extended to the gate 221 side to perform the operation of selectively blocking and opening the gate 221 by being moved up and down when the lead screw 250 rotates. .

Reference numeral 300 denotes a casing surrounding the forward and reverse motors 240, and reference numeral 310 is a cooling water passage formed in the casing 300 to provide a passage through which the cooling water is circulated.

However, as described above, the applicant of the present invention, the valve device is simply because the rotational force of the forward and reverse motor 240 is directly transmitted to the valve pin 230 by the pressure of the resin acting on the valve pin 230 An overload occurs in the reverse motor 240, and the life of the motor 240 is shortened due to such overload.

That is, the size of the forward / reverse motor 240 driving the valve pin 230 is a key for miniaturization of the valve device, and the forward / reverse motor 240 at this time is proportional in size and torque. When the small motor 240 is adopted, there is a problem in that the raising and lowering operation of the valve pin 230 which receives high pressure from the resin becomes difficult. On the contrary, when the large torque 240 is adopted, the overall volume of the valve device is reduced. Causes a problem that becomes large.

The present invention is devised to solve the above problems, an object of the present invention is to increase the torque while reducing the rotational force of the motor to enable the adoption of a small motor and to improve the reliability and response of the operation To provide a valve device for an injection molding machine.

1 and 2 is a cross-sectional view showing a valve device for an injection molding machine according to the prior art,

3 and 4 is a cross-sectional view showing an embodiment of a valve device for injection molding machine according to the present invention,

5 is an exploded perspective view showing a valve device for an injection molding machine according to the present invention;

6 is a plan view showing a planetary gear body viewed from "A-A" of FIG.

7 and 8 are cross-sectional view showing another embodiment of the valve device for injection molding machine according to the present invention,

9 is an exploded perspective view showing the valve device for injection molding machine of FIG.

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

10: valve body 11: resin flow path

12: space portion 13: anti-rotation jaw

20: nozzle 21: gate

30: driving means 31: case

31a: cooling water 32: motor

32a: Motor output stage 40: Planetary gear

41: sun gear 42: pinion gear

43: ring gear 45: rotation axis

46: second gear 47: driven gear

50: valve pin 51: multi-sided

h: heater

In the valve device for injection molding machine according to the present invention for realizing the above object, a resin flow path is formed to move the resin supplied from the outside around the space portion formed in the inner center, the front end portion is connected to the space portion and the resin flow path A valve body provided with a nozzle having a gate for discharging resin, a motor installed in a space portion of the valve body, and receiving power from the outside to selectively generate rotational force in the forward and reverse directions, and at an output end of the motor. A planetary gear body connected to and connected with the rotary shaft to reduce the torque while decelerating the torque, and to rotate the rotary shaft screwed on the outer circumference; It consists of a valve pin that opens and closes the gate by linearly moving the upper end in rotation. And in that the characteristic.

As a preferable feature of the present invention, the planetary gear body is a sun gear which is axially coupled to the output end of the motor and integrally rotated, a plurality of pinion gears engaged with and rotated around the outer circumferential surface of the sun gear, and the pinion The gear is engaged with the inner circumferential surface and forms a rotation gear that rotates in the same direction as the sun gear and has one end of a rotating shaft connected to the valve pin at a central portion thereof.

As another preferable feature of the present invention, the planetary gear body is provided with a sun gear that is axially connected to the output end of the motor to rotate integrally, the fish portion interlocked with the outer circumferential surface of the sun gear, and the lower portion of the planetary gear in a stacked form. A plurality of two-stage gear consisting of a fisherman and the gears are provided to be interlocked between the lower gears of the two-stage gear and the driven gear is connected to one end of the rotary shaft connected to the valve pin to the lower side.

As a preferable feature of the present invention, the valve pin is formed of a plurality of outer peripheral surface of the polygonal surface, at least two of the polygonal surface is in contact with the rotation prevention jaw integrally formed in the valve body to prevent the rotation while vertical movement is possible It is provided, and the flange is formed on the outer periphery of the lower end so as to block the flow of resin into the space portion of the valve body when opening the gate.

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

3 and 4 are cross-sectional views showing an embodiment of a valve device for an injection molding machine according to the present invention, Figure 5 is an exploded perspective view showing a valve device for an injection molding machine according to the present invention, Figure 6 is a "AA of FIG. Is a plan view of the planetary gear body as seen in "

As shown therein, the valve device for injection molding machine according to the present invention is provided with a valve body 10 having a gate 21 as a discharge port for receiving resin and injecting the mold into the inside of the valve body 10. It is provided with a drive means 30 is installed to generate a driving force and to perform the opening and closing operation of the gate 21 by using the driving force.

As shown in the figure, the valve body 10 has an overall diameter of a cylindrical body having an enlarged diameter, and a lower portion of the valve body 10 having a reduced diameter compared to the upper portion. The valve body 10 is formed with a space portion 12 in which the drive means 30 can be installed in the inner center.

On the other hand, around the space portion 12 of the valve body 10 is formed a resin flow passage 11 for guiding the resin supplied from the outside to the mold, the circumference of the resin flow path 11 at this time, that is, the valve The outer diameter surface of the body 10 is a structure provided with the heater h which prevents solidification of resin which passes through the said resin flow path 11 by heat-generating to predetermined temperature by electric resistance.

Here, the nozzle 20 for injecting the resin passing through the resin flow path 11 into the mold is formed at the front end of the valve body 10, the gate 21 having a predetermined diameter in the center of the nozzle 20 ) Is formed vertically, wherein the gate 21 is a structure formed in communication with the space 12 and the resin flow passage 11 of the valve body 10 described above.

The driving means 30 is a motor 32 that generates rotational force in the forward and reverse directions, and a planetary gear body connected to the output end 32a of the motor 32 to receive the rotational force to perform a deceleration and increase torque at the same time. 40 and the valve pin 50 connected to the planetary gear 40 to switch the rotational force in a linear movement to open and close the gate 21.

The motor 32 is provided on the upper side in the space portion 12 of the valve body 10, and generates a rotational force in the forward and reverse directions selectively by receiving power and control signals from the outside. The motor 32 is a conventional brushless type of motor is used, but in some cases, an air and hydraulic motor using a pneumatic or hydraulic pressure as the operating source may be used.

The planetary gear body 40 is composed of a plurality of gear combinations, the role of which is to increase the torque while reducing the rotation ratio of the motor 32 to a certain ratio.

That is, the planetary gear 40 has a sun gear 41 which is shaft-connected to the output end 32a of the motor 32, and a pair of pinion gears 42 engage around the sun gear 41 to rotate. You will play with the ball. In addition, the pinion gear 42 is engaged with a ring gear 43 in which gears are formed on an inner circumferential surface, and the ring gear 43 at this time has a structure in which a screw shaft is connected to the outer circumferential surface.

Here, the rotating shaft 45 is provided on the gate 21 is connected to the upper end of the valve pin 50 and the screw fastening to perform the opening and closing operation.

On the other hand, the valve pin 50 is disposed in the extension line of the rotary shaft 45 and the upper end outer surface is a structure that forms a screw groove vertically so that a portion of the rotary shaft 45 can be inserted, the lower end portion It is located on the gate 21. Here, the depth of the screw groove is formed in consideration of the vertical movement distance of the valve pin 50, that is, the operating section for opening and closing the gate 21.

In addition, the valve pin 50 is a portion of the outer peripheral surface is formed as a polygonal surface (51a) so that the vertical movement is possible while preventing the rotation during the rotation of the rotary shaft (45). At this time, the rotation prevention jaw 13 formed integrally with the valve body 10 is in contact with at least two surfaces. That is, as shown in the drawing, the valve pin 50 has a top outer surface formed in a square shape, and the rectangular outer surface at this time is fitted to the anti-rotation jaw 13 provided in a shape corresponding to the valve body 10 to rotate. This will be prevented.

Such a valve pin 50 is a configuration in which the flange 52 is formed on the outer peripheral surface of the lower end, the flange 52 at this time is in close contact with the inner circumferential surface of the passage forming the valve pin 50 rises and falls It is a structure provided to slide down.

On the other hand, the drive means 30 and the motor 32 and the reduction gear body 40 is a configuration that is covered by the case 31, the case 31 is a structure in which the cooling water passage 31a of the pipeline form is provided As the cooling water passage 31a at this time, the cooling water is circulated to cool the case 31, and as a result, overheating of the motor 32 is prevented.

Reference numerals s1 and s2 denote sensing means for detecting the rotation speed of the motor 32 and the rising and falling of the valve pin 50. The sensing means may be a general photo sensor or a limit. Switches etc. are used.

7 to 9 are cross-sectional views showing another embodiment of the valve device for injection molding machine according to the present invention, showing another embodiment of the planetary gear body.

As shown, the planetary gear body 40 is composed of a sun gear 41, a second gear 46 and a driven gear 47.

The sun gear 41 is configured to be integrally rotated by being axially coupled to the output end 32a of the motor 32, and has a structure in which gear teeth are formed on the outer circumference thereof. Around the sun gear 41, a planetary gear, that is, a plurality of two-stage gears 46 are configured to engage.

The second gear 46 has a structure in which spur gears are stacked up and down, and the upper gear 46a is configured to interlock with the sun gear 41, and the lower gear 46b is driven with the driven gear 47. Occlusion configuration.

The driven gear 47 is provided between the lower gears of the two-stage gear 46 provided in plural, and is configured to receive rotational force, and has a structure in which the rotation shaft 47a extends from the lower center portion. At this time, the rotary shaft 47a is screwed with an outer circumferential surface, and the screwed portion is connected to the upper end of the valve pin 50 by screwing.

The planetary gear body 40 configured as described above increases torque while decelerating the rotation ratio of the motor 32 by a proper ratio by properly combining the gear teeth of the sun gear 41, the second gear 46 and the driven gear 47. Let's go.

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, the forward and reverse motors, which are supplied with power from the outside, selectively move the valve pin vertically by a predetermined stroke up and down, and the valve pin is moved by the operation of the valve pin. Since the interlocking of the gate is interlocked to interlock, the response speed can be increased as compared to the past, and the quality of the 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 (4)

A valve body having a resin flow path through which resin supplied from the outside moves around the space portion formed at the inner center thereof, and a nozzle body having a nozzle formed at a distal end thereof connected to the space portion and the resin flow passage to discharge the resin; A motor installed in the space portion of the valve body and selectively generating power in a forward and reverse direction by receiving power from the outside; A planetary gear body connected to an output end of the motor and receiving a rotational force to increase torque while rotating the rotating shaft screwed on an outer circumference thereof; A valve pin for fastening a portion of the upper end to the rotating shaft and being positioned on the gate with the lower end extending, and opening and closing the gate by linearly moving the upper end in the axial direction during forward and reverse rotation of the rotating shaft; Valve device for injection molding machine, characterized in that consisting of. The method of claim 1, wherein the planetary gear body, A sun gear rotated integrally by being shaft-connected to the output end of the motor, A plurality of pinion gears engaged with the outer circumferential surface of the sun gear and revolving and rotating around the sun gear; A ring gear that is engaged with the pinion gear on an inner circumferential surface thereof and rotates in the same direction as the sun gear and has one end of a rotating shaft connected to a valve pin at a central portion thereof; Valve device for injection molding machine, characterized in that consisting of. The method of claim 1, wherein the planetary gear body, A sun gear coupled to the output end of the motor to rotate integrally; A plurality of two-stage gears comprising the fish portion that is interlocked with the outer circumferential surface of the sun gear and a lower portion provided in a stacked form below the fish portion; A driven gear which is provided to be interlocked between the lower gears of the second gear and is connected to one end of a rotating shaft connected to the valve pin at a lower side thereof; Valve device for injection molding machine, characterized in that consisting of. The valve pin of claim 1, wherein a part of the outer circumferential surface of the valve pin is formed into a polygonal surface, and at least two of the polygonal surfaces are in contact with a rotation prevention jaw integrally formed in the valve body, thereby preventing rotation and providing vertical movement. The valve device for injection molding machine, characterized in that the flange is formed on the outer periphery of the lower end to block the flow of resin into the space of the valve body when the gate is opened.