KR920004589Y1 - Bicylindes actuator for a plastics injection molding machine - Google Patents

Abstract

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Description

Hydraulic Actuator of Plastic Injection Molding Machine

1 is a plan view including a partial cross-section of a conventional hydraulic actuator mounted on a screw conveyor of a plastic injection machine.

2 is a front view of the plastic injection machine equipped with the hydraulic actuation port of the present invention.

3 is a plan view including a partial cross section of the hydraulic actuator of the present invention mounted to a conventional screw conveyor.

Figure 4 is a cross-sectional view showing the operating state when the hydraulic operation tool of the present invention when the injection operation at a very high pressure.

Figure 5 is a cross-sectional view showing the operating state when the hydraulic operation tool of the present invention when the injection operation at high speed.

Figure 6 is a cross-sectional view showing the operating state when the hydraulic operation tool of the present invention when the injection operation at a very low speed.

* Explanation of symbols for main parts of the drawings

1: Main operation port 2: Auxiliary operation port

7: Strow conveyor 10: Main cylinder

11: piston rod 12: piston

14: stopper 15: stopper

16: connecting rod 20: auxiliary cylinder

22: piston 25: cap

101, 102: chamber 121 of main cylinder: packing of piston 12

141: small holes 151, 152: small holes

201: chamber 221 of auxiliary cylinder: packing of piston 22

250: through hole 251: nut

The present invention relates to an injection operation port of a plastic injection molding machine, and more particularly, to a hydraulic operation unit having an auxiliary operation opening to be used according to the injection operation.

As shown in FIG. 1, the hydraulic actuator used in the conventional plastic injection molding machine was configured by installing a pair of parallel hydraulic cylinders (1) in one cylinder, and the pair of hydraulic actuators 1 Mounted symmetrically on both sides of the screw conveyor (7), the screw conveyor (7) is a device known in the art of plastic injection, the screw conveyor (7) is provided with a frame (71) On the rear side of the frame 71, the rotating shaft 72 is extended, and on the front side, the tube frame 73 is extended and provided.

Each of the hydraulic actuating openings 1 includes a cylinder 10 whose both ends are closed as stoppers 14 and 15, and a piston 12 reciprocating in the cylinder 10 is inserted therein. The piston rod 11 is connected, one end of which is extended outward through the stopper 14, and the sealing state is prevented so that fluid does not leak between the rod 1 and the stopper 14. It is configured to maintain.

In addition, in order to maintain a fluid sealing state between the piston 12 to which the rod 11 is connected and the inner wall of the cylinder 10, a predetermined piston packing 121 is formed at the outer diameter of the piston 12. Is inserted.

The piston rod 11 penetrates the stopper 14 on one side of the cylinder 10 as described above, and extends in parallel with the rotation shaft 72 of the screw conveyor 7. As shown in (11), the end of the rotating shaft 72 is inserted into the bearing 4 as shown in FIG.

As shown in FIG. 2, the pair of hydraulic actuating mechanisms 1 mounted on the screw conveyor 7, the bearing part 4, and the electro-automatic hydraulic motor 3 are installed on the base 51 perturbed from side to side. It is.

In operation, the hydraulic motor 3 is turned "on" to rotate the rotating shaft 72 of the screw conveyor 7 so that the screw (not shown) coupled thereto is rotated to move the material, and another hydraulic Since the base 51 is moved to the preset position by perturbing the front by the operation port 5, the hydraulic operation port 1, the screw conveyor 7, the bearing part 4, and the hydraulic motor 3 are thus moved. The back is also moved to the injection position.

Next, when the fluid or oil is supplied to the pair of cylinders 10, the piston 12 is moved under pressure so that the piston rods 11 of the pair of hydraulic actuating holes 1 protrude outwards.

The screw conveyor 7 performs the injection operation through the bearing part 4 by the movement to the front side at the same time as the above-mentioned hydraulic actuating tool 1, so that the injection operation of the plastic injection machine is performed.

Next, when the above injection operation is completed, the base 51 is returned to its original position to prepare for the next injection operation.

However, in practice, since there are a variety of products manufactured through plastic injection openings, there is a need for different injection pressures in this injection process.

However, the conventional hydraulic operating port of the plastic injection machine is that the size is determined so that when the injection pressure is different it is to be adjusted only by the output of the hydraulic pump.

This is because the hydraulic pump has to widen the range of output, there is a problem that the manufacturing cost is high.

Therefore, the present inventors have attempted to improve the hydraulic operation tool used in the plastic injection molding machine to solve the above problems.

It is an object of the present invention to provide a pair of hydraulic actuators that can eliminate the drawbacks of hydraulic actuators used in plastic injection molding machines.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3, the hydraulic actuating openings for the plastic injection machine are mounted in a pair in parallel to each other on both sides of the frame 71 of the conveyor 7, which is the same as the conventional throw conveyor shown in FIG. Each of these hydraulic actuating tools is composed of a main actuating tool 1 and an auxiliary actuating tool 2, and the auxiliary actuating tool 2 is attached to the main actuating tool 1 in the same shaft.

The main operation opening 1 is a main cylinder 10 which is sealed in a fluid sealing manner by plugs 14 and 15 having holes at both end portions thereof, and a piston packing on an outer circumferential surface of the cylinder 10. A piston 12 into which the 121 is inserted is inserted into the perturbation material, and is composed of a piston rod 11 coupled to the piston 12, and the piston rod 11 is the plug 14 on the one side described above. It extends to the outside through the hole of, and is installed in parallel with the pair of piston rod 11 and the rotary shaft 72 of the screw conveyor 7 described above, the pair of piston rod 11 and the rotary shaft 72 is inserted into the bearing part 4 shown in FIG.

Further, the small holes 14 and 152 are laid in the plugs 14 and 15 on both sides, respectively, so that each of the small holes 141 and 152 has a piston (not shown) inside the main cylinder 10. It communicates with each of the inner chambers 101 and 102 separated by 12).

On the other hand, the auxiliary operation tool (2) also has an auxiliary cylinder (20), the auxiliary cylinder 20 is installed on the plug (15) of the one side in the same axis on the main cylinder (10).

It is preferable that the size of the auxiliary cylinder 20 be configured to be slightly smaller than the main cylinder 10 described above, but the length of the auxiliary cylinder 2 is equal to or slightly the length of the main cylinder 10 described above. It is preferable to comprise long.

In addition, the auxiliary cylinder 20 is a piston 22 is inserted, the piston packing 221 is mounted on the outer peripheral surface of the piston 22, the piston 22 and the main cylinder 10 described above. The piston 12 is connected to the same axis as the connecting rod 16, the stopper 15 of the one side is to prevent the leakage of fluid due to the reciprocating movement of the connecting rod 16, The end of the connecting rod 16 penetrates the piston 22 and is screwed with a nut 251 to fix the piston 22.

In addition, the stopper 15 of the one side is laid another small hole 151 is in communication with the internal chamber 201 of the auxiliary cylinder 20, the end of the auxiliary cylinder 20, the connection rod ( The cam 25 having the through hole 250 is coaxially attached to 16 and the nut 251 is configured to freely enter and exit the through hole 250.

Next, the operation of the embodiment will be described.

The hydraulic actuator of the present invention is equipped with a secondary hydraulic actuator is capable of performing the injection operation suitable for both sides of the injection pressure and the injection speed of the plastic injection machine.

As shown in FIG. 4, when the injection operation is performed at a very high pressure, the internal chamber 101 of the main cylinder 10 and the auxiliary cylinder 20 passes the fluid or oil through the small holes 141 and 151 by a hydraulic pump. When supplied to each of the 201, the fluid or oil in the inner chamber 102 of one side of the main cylinder 10 is discharged through the small hole 152 to be refluxed.

Due to the pressure of the fluid or oil in the chambers 101 and 201, the two pistons 12 and 22 are simultaneously moved forward to inject the molten plastic material into the mold.

On the contrary, when the fluid or oil is supplied to the inner chamber 102 on one side of the main cylinder 10 through the small holes 152, the two pistons 12 and 22 are returned to their original positions by the pressure. Fluid or oil entering and exiting the chambers 101 and 201 is discharged and refluxed through the small holes 141 and 151.

Therefore, by the simultaneous movement of the piston 12 of the main operating tool (1) and the piston 22 of the auxiliary operating tool (2) is a high-pressure injection operation is performed.

Next, in the ultra-high speed injection operation, as shown in FIG. 5, the main operating tool 1 operates only the auxiliary operating tool 2 without operating.

That is, the fluid or oil is supplied to the chamber 201 of the auxiliary cylinder 20 only through the small holes 151.

Since the diameter of the auxiliary cylinder 20 is small, the piston 22 inserted therein is quickly operated.

When it is returned to the original position, the piston 12, 22 is returned to the original position by supplying fluid or oil through the small holes 152 only to the chamber 102 on one side of the main cylinder 10.

In the same manner as described above, when the injection operation is performed at a low speed, the fluid or oil is supplied through the small holes 141 only to the chamber 101 on one side of the main cylinder 10.

Next, when the injection operation is performed at a very low speed, fluid or oil is simultaneously supplied only to the chamber 101 of the main cylinder 10 and the chamber 201 of the auxiliary cylinder 20, as shown in FIG.

That is, since the fluid or oil is simultaneously supplied to the chambers 101 and 201 on both sides, the capacity thereof is increased, thereby performing an ultra low speed injection operation.

The above-described embodiments are described for the most practical and optimal embodiments of the present invention, and the present invention is not limited to the above-described embodiments, and may be configured with embodiments having various types and commonalities. Of course, it belongs to the technical spirit of the present invention and the following claims.

Claims (2)

Both chambers are connected to the inside of the main cylinder 10 by a first piston 12 inserted into the inside of the main cylinder 10 whose both ends are sealed as a pair of stoppers 14 and 15. 101 and 102, and two pores 141 and 152 for inlet and discharge of fluid are laid in the plugs 14 and 15 on both sides, respectively, and the two chambers 101 and 102 are installed. And a piston rod 11 is coupled to the first piston 12, the other end of the piston rod penetrates the plug 14 on one side to extend to the outside, and the end portion thereof is normally connected. A main operation tool 1 inserted into the bearing part of the plastic injection machine; And perturbation material is inserted into the interior of the auxiliary cylinder 20 attached to the main operation opening 1 coaxially with the stopper 15 of the one side and the outer peripheral surface is airtight with the inner peripheral surface of the auxiliary cylinder 20 A connecting rod penetrating the uniaxial stopper 15 through the second piston 22 forming the variable chamber 201 in the auxiliary cylinder and the first piston 12 in the main cylinder 10 by being abutted. A plastic injection composed of an auxiliary operation tool 2 connected to the stopper 15 and having a stopper 151 for drawing or discharging fluid into the stopper 15 and communicating with the variable chamber 201. Double cylinder actuator for molding machines. The hydraulic actuator of claim 1, wherein the auxiliary cylinder (20) is attached to the main cylinder (10) by attaching a can (25) having a through hole (250) coaxially opposite the end portion.