Automatic demolding structure for injection molding machine

Abstract

The utility model discloses an automatic demolding structure for an injection molding machine, which comprises a fixed mold seat and a mounting seat mounted at the other end, a fixed mold block is fixedly mounted on the fixed mold seat, a positioning seat is fixedly mounted on one side of the mounting seat, and four groups of oil cylinders are fixedly mounted on the mounting seat and penetrate through the positioning seat. A pushing rod is arranged at the end of the oil cylinder, a pushing frame is fixedly installed at the end of the pushing rod, a movable mold frame is installed between the pushing frame and the fixed mold block, and a material piece is arranged between the movable mold frame and the fixed mold block in an injection molding mode. According to the utility model, the times and steps of demoulding are reduced, internal demoulding and external demoulding are carried out simultaneously, part of coincidence time is increased, the demoulding time is accelerated, and the demoulding efficiency is improved while the demoulding effect is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding machine technology, specifically relating to an automatic demolding structure for injection molding machines. Background Technology

[0002] Injection molding machines, also known as injection molding machines or injection molding machines, are the main molding equipment used to produce various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. They are classified as vertical, horizontal, and all-electric. Injection molding machines heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity.

[0003] A domestic utility model patent application with application number 202323276842.3 discloses a demolding mechanism for internal threads of injection molded parts, including a slider core-pulling assembly and a thread core-pulling assembly. The slider core-pulling assembly consists of a slider core-pulling insert, a slider group, a push plate, a hydraulic cylinder, and a sliding groove module. The slider core-pulling insert consists of a molding end and a transmission rod. The slider group has an installation groove and slide rails on both sides. Two hydraulic cylinders are symmetrically arranged on the templates on both sides of the slider group. The thread core-pulling assembly consists of a thread core-pulling insert, a transmission component, a bushing, a driven gear, a drive gear, and a motor. The thread core-pulling insert is fitted around the outer periphery of the molding end. The transmission component has a through hole, and the driven gear has a mounting seat. The end of the transmission component is slidably connected to the bushing. By using a motor for thread core pulling followed by symmetrically arranged dual cylinders to push the slider core-pulling assembly for core pulling, the problem of easily damaging the threads during thread core pulling is solved, and jamming during the core pulling process is prevented. The above-mentioned utility model is used for demolding of injection molded parts with internal threads. During the demolding process, the threaded structure can only be demolded by rotating along the thread direction. However, for internal threaded structures, the external structure needs to be demolded first, and then the thread needs to be demolded. The demolding steps are multiple and cannot be completed in the same time period, which prolongs the demolding time and reduces the demolding efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an automatic demolding structure for injection molding machines, including a fixed mold base and a mounting base installed at the other end. A fixed module is fixedly installed on the fixed mold base, and a positioning seat is fixedly installed on one side of the mounting base. Four sets of hydraulic cylinders are fixedly installed through the positioning seat on the mounting base, and a push rod is provided at the end of each hydraulic cylinder. A push frame is fixedly installed at the end of each push rod. A moving mold frame is installed between the push frame and the fixed module. A material part is injected between the moving mold frame and the fixed module.

[0005] As a further preferred technical solution of this utility model, the fixed mold base is provided with a main channel that connects with the injection nozzle, the fixed module is provided with a corresponding injection channel at the same position as the main channel, and the fixed module is provided with an injection cavity.

[0006] The injection material is pushed from the nozzle into the main channel and then filled into the injection cavity by the injection channel.

[0007] As a further preferred technical solution of this utility model, a threaded auxiliary guide rod is fixedly installed on the side of the positioning seat near the push frame.

[0008] The demolding frame is pushed by a threaded guide rod.

[0009] As a further preferred technical solution of this utility model, a rotating block is installed at the center of the push frame, and the outer ring of the rotating block is rotatably installed with the push frame through a hollow bearing seat. A threaded moving module is fixedly installed at one end of the rotating block.

[0010] When injection molding a workpiece with internal threads, a threaded moving module and a fixed module of a specified size are required to cooperate in the injection molding process.

[0011] As a further preferred technical solution of this utility model, the rotating block is threaded through the threaded auxiliary guide rod and an auxiliary cavity is provided inside the threaded moving module.

[0012] When the pusher frame is pulled by the pusher rod to demold, the rotating block rotates outside the threaded auxiliary guide rod, and the rotating block is assisted by the hollow bearing seat to rotate, so that the rotating block drives the threaded moving module to rotate, so as to achieve the demolding effect of the threaded structure.

[0013] As a further preferred technical solution of this utility model, four sets of positioning rods are fixedly installed between the positioning seat and the fixed mold seat, four sets of sliding blocks are provided around the outside of the moving mold frame, and the sliding blocks are slidably installed on the positioning rods, and limit blocks are fixedly installed on the positioning rods.

[0014] After injection molding, the moving mold base slides in the opposite direction to the fixed mold base under force to facilitate demolding of the material part, and the sliding distance of the moving mold base is limited by the limit block.

[0015] As a further preferred technical solution of this utility model, a groove is provided on one side of the threaded moving module on the moving mold frame, and a threaded mating hole is provided on the moving mold frame to cooperate with the threaded moving module.

[0016] During the demolding process, the pusher is pulled by the pusher rod. Based on the adhesion force between the threaded moving module and the material part when the injection molding is completed, the moving mold frame moves according to the movement of the pusher.

[0017] Beneficial effects

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. When the push frame is pulled by the push rod to demold, the rotating block rotates outside the threaded auxiliary guide rod, and the rotating block is assisted by the hollow bearing seat to rotate, so that the rotating block drives the threaded moving module to rotate, so as to achieve the demolding effect of the threaded structure and avoid damage to the already injected threaded structure.

[0020] 2. During the demolding process, the pusher is pulled by the pusher rod. Based on the adhesion force between the threaded moving module and the material part when the injection molding is completed, the moving mold frame moves according to the movement of the pusher. During the movement, the rotating block rotates outside the threaded auxiliary guide rod, so that the threaded moving module demolds at the same time, reducing the number of demolding steps. The internal and external demolding are carried out simultaneously, increasing the overlap time and accelerating the demolding time. This improves the demolding efficiency while ensuring the demolding effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a cross-sectional structural diagram of the injection molding process of this utility model;

[0023] Figure 3 This is a cross-sectional structural diagram of the demolding process of this utility model;

[0024] Figure 4 for Figure 3 A magnified structural diagram of point A in the middle.

[0025] In the diagram: 1. Fixed mold base; 11. Main runner; 2. Mounting base; 21. Hydraulic cylinder; 22. Push rod; 23. Positioning rod; 24. Limiting block; 3. Fixed module; 31. Injection channel; 32. Injection cavity; 4. Positioning seat; 41. Threaded auxiliary guide rod; 5. Moving mold frame; 51. Sliding block; 52. Groove; 53. Threaded mating hole; 6. Push frame; 61. Rotating block; 62. Hollow bearing seat; 63. Threaded moving module; 64. Auxiliary cavity; 7. Material part. Detailed Implementation

[0026] This specific embodiment is an automatic demolding structure for injection molding machines.

[0027] The above-mentioned utility model is used for demolding of injection molded parts with internal threads. During the demolding process, the threaded structure can only be demolded by rotating along the thread direction. However, for internal threaded structures, the external structure needs to be demolded first, and then the thread needs to be demolded. The demolding steps are multiple and cannot be completed in the same time period, which prolongs the demolding time and reduces the demolding efficiency.

[0028] Its structural diagram is as follows Figures 1-4As shown. An automatic demolding structure for an injection molding machine includes a fixed mold base 1 and a mounting base 2 installed at the other end. A fixed module 3 is fixedly installed on the fixed mold base 1. The fixed mold base 1 has a main runner 11 that connects with the injection nozzle. The fixed module 3 has a corresponding injection channel 31 at the same position as the main runner 11. The fixed module 3 has an injection cavity 32 inside. The injection material is pushed into the main runner 11 by the nozzle and filled into the injection cavity 32 by the injection channel 31. A positioning seat 4 is fixedly installed on one side of the mounting base 2. Four sets of hydraulic cylinders 21 are fixedly installed through the positioning seat 4 on the mounting base 2. The end of the hydraulic cylinder 21 is provided with a push rod 22, and the end of the push rod 22 is fixedly installed with a push frame 6. A threaded auxiliary guide rod 41 is fixedly installed on the side of the positioning seat 4 near the push frame 6. The threaded auxiliary guide rod 41 assists the push frame 6 in demolding. A rotating block 61 is installed at the center of the push frame 6. The outer ring of the rotating block 61 is rotatably mounted to the push frame 6 via a hollow bearing seat 62. A threaded moving module 63 is fixedly installed at one end of the rotating block 61. When injection molding a workpiece with internal threads, the threaded moving module 63 of a specified size needs to cooperate with the fixed module 3 for injection molding.

[0029] The rotating block 61 is threaded through the threaded auxiliary guide rod 41 and installed therein. An auxiliary cavity 64 is provided inside the threaded moving module 63. When the push frame 6 is pulled by the push rod 22 for demolding, the rotating block 61 rotates outside the threaded auxiliary guide rod 41, and the rotation is assisted by the hollow bearing seat 62, causing the rotating block 61 to drive the threaded moving module 63 to rotate, thus achieving the demolding effect on the threaded structure and avoiding damage to the already injection-molded threaded structure. A moving mold frame 5 is installed between the push frame 6 and the fixed module 3, and a material part 7 is injection-molded between the moving mold frame 5 and the fixed module 3. The material part 7 is injection-molded in the injection cavity 32.

[0030] Four sets of positioning rods 23 are fixedly installed between the positioning base 4 and the fixed mold base 1. Four sets of sliding blocks 51 are provided around the outside of the moving mold frame 5, and the sliding blocks 51 are slidably installed on the positioning rods 23. Limiting blocks 24 are fixedly installed on the positioning rods 23. After injection molding, the moving mold frame 5 slides in the opposite direction to the fixed mold module 3 to facilitate the demolding of the material part 7, and the sliding distance of the moving mold frame 5 is limited by the limiting blocks 24. A groove 52 is provided on the moving mold frame 5 on one side of the threaded moving module 63, and a threaded mating hole 53 is provided on the moving mold frame 5 to cooperate with the threaded moving module 63. During the demolding process, the pusher 6 is pulled by the pusher rod 22. Based on the adhesion force between the threaded moving module 63 and the material part 7 when the injection molding is completed, the moving mold frame 5 moves according to the movement of the pusher 6. During the movement, the rotating block 61 rotates outside the threaded auxiliary guide rod 41, so that the threaded moving module 63 demolds simultaneously, reducing the number of demolding steps and demolding. The internal and external demolding are carried out simultaneously, increasing the overlap time. Simultaneous demolding also accelerates the demolding time, improving demolding efficiency while ensuring the demolding effect.

[0031] Example: The push rod 22 pushes the push frame 6, thereby moving the moving mold frame 5 so that the moving mold frame 5 fits with the fixed module 3. The injection material is pushed from the nozzle into the main runner 11 and filled into the injection cavity 32 by the injection channel 31. After injection, the push rod 22 pulls the push frame 6. When the push frame 6 is pulled by the push rod 22 for demolding, the rotating block 61 rotates outside the threaded auxiliary guide rod 41 and is assisted by the hollow bearing seat 62 to rotate the rotating block 61, so that the rotating block 61 drives the threaded moving module 63 to rotate, so as to achieve the demolding effect of the threaded structure. The internal and external demolding are carried out simultaneously.

[0032] All technical features in this embodiment can be freely combined according to actual needs.

[0033] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. An automatic demolding structure for an injection molding machine, characterized in that, It includes a fixed mold base (1) and a mounting base (2) installed at the other end. A fixed module (3) is fixedly installed on the fixed mold base (1). A positioning seat (4) is fixedly installed on one side of the mounting base (2). Four sets of hydraulic cylinders (21) are fixedly installed through the positioning seat (4) on the mounting base (2). A push rod (22) is provided at the end of the hydraulic cylinder (21). A push frame (6) is fixedly installed at the end of the push rod (22). A moving mold frame (5) is installed between the push frame (6) and the fixed module (3). A material part (7) is injected between the moving mold frame (5) and the fixed module (3).

2. The automatic demolding structure for an injection molding machine according to claim 1, characterized in that: The fixed mold base (1) has a main channel (11) that connects with the injection nozzle, and the fixed module (3) has a corresponding injection channel (31) at the same position as the main channel (11), and the fixed module (3) has an injection cavity (32) inside.

3. The automatic demolding structure for an injection molding machine according to claim 1, characterized in that: A threaded auxiliary guide rod (41) is fixedly installed on the side of the positioning seat (4) near the push frame (6).

4. The automatic demolding structure for an injection molding machine according to claim 3, characterized in that: A rotating block (61) is installed at the center of the push frame (6). The outer ring of the rotating block (61) is rotatably installed with the push frame (6) through a hollow bearing seat (62). A threaded moving module (63) is fixedly installed at one end of the rotating block (61).

5. The automatic demolding structure for an injection molding machine according to claim 4, characterized in that: The rotating block (61) is threaded through the threaded auxiliary guide rod (41) and an auxiliary cavity (64) is provided inside the threaded moving module (63).

6. The automatic demolding structure for an injection molding machine according to claim 1, characterized in that: Four sets of positioning rods (23) are fixedly installed between the positioning seat (4) and the fixed mold seat (1). Four sets of sliding blocks (51) are provided around the outside of the moving mold frame (5), and the sliding blocks (51) are slidably installed on the positioning rods (23). Limiting blocks (24) are fixedly installed on the positioning rods (23).

7. The automatic demolding structure for an injection molding machine according to claim 4, characterized in that: The moving mold frame (5) has a groove (52) on one side of the threaded moving module (63), and the moving mold frame (5) has a threaded mating hole (53) to cooperate with the threaded moving module (63).

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