Screw head structure for injection molding machine

Abstract

The utility model relates to the technical field of injection molding processing, and discloses a screw head structure for an injection molding machine, which comprises an injection molding cylinder, an injection molding head fixedly connected at a discharge port of the injection molding cylinder, a control box fixedly connected in the injection molding head, a connecting insertion cylinder fixedly connected on the control box, and a connecting insertion cylinder slidably connected with an injection molding port of an injection molding grinding tool. The injection molding device comprises a control box, a connecting insertion barrel is arranged between the connecting insertion barrel and the injection molding head, the connecting insertion barrel is communicated with the injection molding head, a sliding groove is formed in the control box, two sets of sealing insertion plates which are symmetrically arranged in a circumferential mode are connected in the sliding groove in a sliding mode, and extrusion openings are symmetrically formed in one sides of the two sets of sealing insertion plates. Only when the connecting insertion barrel is inserted into a mold and the pressure intensity of molten raw materials in the injection molding head is high enough, the two sets of sealing insertion plates can be controlled to be opened, and when the pressure intensity of the molten raw materials in the injection molding head is reduced, the two sets of sealing insertion plates can be automatically closed, so that the raw materials are prevented from flowing back, and the practicability of equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a screw head structure for an injection molding machine. Background Art

[0002] Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment that uses plastic molding molds to make plastic products of various shapes of thermoplastics or thermosetting plastics. It is divided into vertical, horizontal and all-electric types. The injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it ejected and fill the mold cavity.

[0003] The existing screw head for injection molding machine is not provided with a structure to prevent the backflow of raw materials, which easily leads to defective products. Therefore, we propose a screw head structure for injection molding machine. Summary of the Invention

[0004] The purpose of the utility model is to provide a screw head structure for an injection molding machine to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A screw head structure for an injection molding machine includes an injection cylinder, an injection head is fixedly connected to the discharge port of the injection cylinder, a control box is fixedly connected to the injection head, a connecting plug is fixedly connected to the control box, the connecting plug and the injection port of the injection molding die are slidably connected to each other, the connecting plug and the injection head are communicated with each other, a sliding groove is provided in the control box, two groups of sealing plugs symmetrically arranged in a circumferential direction are slidably connected in the sliding groove, the two groups of sealing plugs are symmetrically provided with extrusion ports on one side, one end of a connecting plate is fixedly connected to the other side of the two groups of sealing plugs, the other end of the connecting plate passes through the control box and is fixedly connected to a fixed cylinder, and piston cylinders are fixedly connected on both sides of the injection head A guide port is provided between the piston cylinder and the injection head, and a sealing plug is slidably connected to the piston cylinder, and the sealing plug and the guide port are slidably connected to each other, and one end of the connecting rod is fixedly connected to the sealing plug, and the other end of the connecting rod passes through the piston cylinder and is fixedly connected to the driving cylinder. A first spring is provided in the piston cylinder and is sleeved on the connecting rod, and an insertion rod is slidably connected in the fixed cylinder, and a top block is fixedly connected on one end of the insertion rod close to the connecting insertion cylinder, and a second spring sleeved on the insertion rod is provided between the top block and the fixed cylinder, and the other end of the insertion rod is slidably connected in the driving cylinder, and a notch is provided on one side of the driving cylinder close to the piston cylinder, and the notch is slidably connected to the insertion rod.

[0007] As a further solution of the present invention: multiple groups of hot runners are connected to the outer wall of the injection cylinder.

[0008] As a further solution of the present invention: an extrusion screw is rotatably installed in the injection molding cylinder.

[0009] Compared with the prior art, the beneficial effect of the present invention is as follows: the present invention controls the sealing of the injection head by arranging a sealing plug plate between the connecting plug cylinder and the injection head. Only when the connecting plug cylinder is inserted into the mold and the pressure of the molten raw material in the injection head is high enough can the two sets of sealing plug plates be controlled to open. When the pressure of the molten raw material in the injection head decreases, the two sets of sealing plug plates will automatically close, thereby preventing the raw material from flowing back, thereby improving the practicality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is a structural schematic diagram of a screw head structure for an injection molding machine.

[0011] Figure 2 The utility model is a structural schematic diagram of a sealing insert plate in a screw head structure for an injection molding machine.

[0012] Figure 3 This is a cross-sectional view of a screw head structure for an injection molding machine in the utility model.

[0013] Figure 4 This is a cross-sectional view of a screw head structure for an injection molding machine in the utility model.

[0014] In the figure: 1-injection cylinder, 2-hot runner, 3-extrusion screw, 4-injection head, 5-control box, 6-connecting plug cylinder, 7-sliding groove, 8-sealing plug plate, 9-extrusion port, 10-connecting plate, 11-fixed cylinder, 12-piston cylinder, 13-guide port, 14-sealing plug, 15-connecting rod, 16-first spring, 17-driving cylinder, 18-notch, 19-plug, 20-top block, 21-second spring. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] See Figures 1 to 4In the embodiment of the present utility model, a screw head structure for an injection molding machine includes an injection cylinder 1, an injection head 4 is fixedly connected to the discharge port of the injection cylinder 1, a control box 5 is fixedly connected to the injection head 4, a connecting plug 6 is fixedly connected to the control box 5, the connecting plug 6 and the injection port of the injection molding die are slidably connected to each other, and the connecting plug 6 and the injection head 4 are communicated with each other, a sliding groove 7 is provided in the control box 5, and two groups of sealing plugs 8 symmetrically arranged in a circumferential direction are slidably connected in the sliding groove 7, and the two groups of sealing plugs 8 are symmetrically provided with extrusion ports 9 on one side, and the other side of the two groups of sealing plugs 8 is fixedly connected to one end of a connecting plate 10, and the other end of the connecting plate 10 passes through the control box 5 and is fixedly connected to a fixed cylinder 11, and piston cylinders 12 are fixedly connected to the injection head 4 on both sides. A guide port 13 is provided between the piston cylinder 12, a sealing plug 14 is slidably connected in the piston cylinder 12, the sealing plug 14 and the guide port 13 are slidably connected to each other, one end of a connecting rod 15 is fixedly connected to the sealing plug 14, and the other end of the connecting rod 15 is fixedly connected to a driving cylinder 17 through the piston cylinder 12, a first spring 16 sleeved on the connecting rod 15 is provided in the piston cylinder 12, a plug rod 19 is slidably connected in the fixed cylinder 11, a top block 20 is fixedly connected to the end of the plug rod 19 close to the connecting plug cylinder 6, a second spring 21 sleeved on the plug rod 19 is provided between the top block 20 and the fixed cylinder 11, the other end of the plug rod 19 is slidably connected in the driving cylinder 17, and a notch 18 is provided on the side of the driving cylinder 17 close to the piston cylinder 12, and the notch 18 is slidably connected to the plug rod 19;

[0017] The utility model first continuously extrude the molten raw material into the injection head 4, and at the same time insert the connecting insert 6 into the injection mold. As the connecting insert 6 is inserted into the injection mold, the mold pushes the top block 20 toward the side close to the injection cylinder 1, and the top block 20 compresses the second spring 21, and at the same time drives the insertion rod 19 to be inserted into the driving cylinder 17. At this time, the insertion rod 19 passes through the notch 18 and is inserted into the bottom of the driving cylinder 17. At this time, as the molten raw material is continuously injected into the injection head 4, the hydraulic pressure of the molten raw material in the injection head 4 gradually increases. As the pressure increases, the pressure of the molten raw material on the sealing plug 14 increases synchronously. When the molten raw material is continuously injected into the injection head 4, the hydraulic pressure of the molten raw material in the injection head 4 gradually increases. As the pressure increases, the pressure of the molten raw material on the sealing plug 14 increases synchronously. When the thrust generated by the material is greater than the elastic force of the first spring 16, the first spring 16 is compressed, and then the sealing plug 14 is pushed to slide into the piston cylinder 12, and the sealing plug 14 drives the connecting rod 15 to extend from the piston cylinder 12, and the connecting rod 15 drives the driving cylinder 17 to move to the side away from the injection head 4, and the driving cylinder 17 drives the plug rod 19 to move, and the plug rod 19 drives the fixed cylinder 11 to move, and the fixed cylinder 11 drives the sealing plug plate 8 to move in the sliding groove 7 through the connecting plate 10. At this time, the two groups of sealing plug plates 8 move toward each other, thereby aligning the two groups of extrusion ports 9 with each other, so that the connecting plug cylinder 6 and the injection molding machine are connected. The heads 4 are connected to each other. At this time, the high-pressure molten raw material is quickly injected into the injection mold along the injection head 4 and the connecting insert 6. When the injection is completed, the injection cylinder 1 no longer extrudes the raw material into the injection head 4. The pressure of the raw material in the injection head 4 decreases rapidly. At this time, the thrust exerted on the first spring 16 is synchronously reduced, and the first spring 16 releases its elastic potential energy, thereby pushing the sealing plug 14 to be inserted into the guide port 13 again. At this time, the sealing plug 14 drives the driving cylinder 17 to reset synchronously through the connecting rod 15. The driving cylinder 17 drives the fixed cylinder 11 to reset through the insert rod 19. The fixed cylinder 11 drives the two sets of sealing insert plates 8 through the connecting plate 10. The connecting cylinder 6 and the injection head 4 are synchronously contracted to seal and isolate each other. After the connecting cylinder 6 is pulled out from the injection mold, the top block 20 loses the push of the injection mold, and the second spring 21 releases the elastic potential energy to push the top block 20 to move to the side away from the fixed cylinder 11. The top block 20 drives the insertion rod 19 to be pulled out from the driving cylinder 17. At this time, the tail end of the insertion rod 19 moves to the groove 18. At this time, even if the injection cylinder 1 extrude the molten raw material into the injection head 4, the driving cylinder 17 cannot drive the driving insertion rod 19 to move, that is, the two sets of sealing inserts 8 cannot be opened, thereby preventing the outflow of raw materials.

[0018] In one embodiment of the present invention, see Figures 1 to 4 The outer wall of the injection molding cylinder 1 is connected to multiple groups of hot runners 2, and an extrusion screw 3 is rotatably installed in the injection molding cylinder 1. The utility model heats and melts the raw materials in the injection molding cylinder 1 through the setting of the hot runner 2, and spirally extrude the molten raw materials through the extrusion screw 3.

[0019] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A screw head structure for an injection molding machine, comprising an injection molding barrel, characterized in that: The discharge port of the injection molding cylinder is fixedly connected to an injection head, a control box is fixedly connected to the injection head, a connecting plug is fixedly connected to the control box, the connecting plug and the injection port of the injection molding die are slidably connected to each other, and the connecting plug and the injection head are communicated with each other, a sliding groove is provided in the control box, and two groups of sealing plugs symmetrically arranged in a circular manner are slidably connected in the sliding groove, and the extrusion ports are symmetrically provided on one side of the two groups of sealing plugs, and one end of the connecting plate is fixedly connected to the other side of the two groups of sealing plugs, and the other end of the connecting plate is fixedly connected to the fixed cylinder through the control box, and piston cylinders are fixedly connected to the injection molding head on both sides. A guide port is provided in the middle, a sealing plug is slidably connected in the piston cylinder, the sealing plug and the guide port are slidably connected to each other, one end of the connecting rod is fixedly connected to the sealing plug, and the other end of the connecting rod passes through the piston cylinder and is fixedly connected to the driving cylinder, a first spring sleeved on the connecting rod is provided in the piston cylinder, an insertion rod is slidably connected in the fixed cylinder, a top block is fixedly connected on one end of the insertion rod close to the connecting insertion cylinder, a second spring sleeved on the insertion rod is provided between the top block and the fixed cylinder, the other end of the insertion rod is slidably connected in the driving cylinder, and a notch is provided on the side of the driving cylinder close to the piston cylinder, and the notch is slidably connected to the insertion rod.

2. The screw head structure for an injection molding machine according to claim 1, characterized in that: The outer wall of the injection cylinder is connected with multiple groups of hot runners.

3. The screw head structure for an injection molding machine according to claim 1, characterized in that: An extrusion screw is rotatably installed in the injection molding cylinder.

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