Screw thread rotary demoulding mechanism

Abstract

The utility model discloses a screw thread rotary demoulding mechanism, comprising: a slider, a screw thread mandrel, a first driving device and a second driving device, wherein the slider can be driven by an inclined guide column to slide along a direction perpendicular to the direction of mold opening and closing when the mold is opened and closed; the screw thread mandrel slides and inserts into the slider along the sliding direction of the slider, and a spring is installed between the slider and the screw thread mandrel, one end of the screw thread mandrel protrudes out of the slider and is provided with screw threads of a thread structure of a molded product; the first driving device is transmission-connected to the screw thread mandrel, and is used to drive the screw thread mandrel to rotate, and under the elastic force of the spring, the screw thread mandrel rotates and moves in a direction opposite to the product, so that the screw thread is disengaged from the thread structure of the product; the second driving device is arranged opposite to the other end of the screw thread mandrel, and is used to drive the screw thread mandrel to reset. The utility model can shorten the manufacturing cycle of the product and improve the production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a screw thread rotary demoulding mechanism. Background Art

[0002] An injection mold is a mold used to produce plastic products. It usually consists of two parts, a front mold and a back mold. A cavity is formed between the front mold and the back mold. The molten plastic is injected into the cavity through an injection molding machine. After cooling and solidification, the desired plastic product is formed.

[0003] When there is a threaded structure on a plastic product, a mandrel with threaded teeth is usually used to form the threaded structure. Before the product is ejected, the mandrel is driven to rotate to achieve disengagement from the threaded structure of the plastic product. At present, the existing practice generally uses an oil cylinder to drive the mandrel to rotate through a rack and a gear, or uses a motor to drive the mandrel to rotate through a gear set. When the mandrel is pulled out or reset, the driving device needs to drive the mandrel to rotate and move axially at the same time, resulting in a long product manufacturing cycle and unreliable operation. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the invention

[0004] The problem to be solved by the utility model is to provide a screw thread rotary demoulding mechanism to overcome the defects of the existing screw thread mandrel demoulding structure that the product manufacturing cycle is prolonged and the operation is unreliable.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a screw thread rotary demoulding mechanism, comprising:

[0006] A slider, which can be driven by an inclined guide column to slide in a direction perpendicular to the mold opening and closing direction when the mold is opened and closed;

[0007] A screw thread mandrel, which slides and penetrates into the slider along the sliding direction of the slider, and a spring is installed between the slider and the screw thread mandrel, and the spring always applies an elastic force to the screw thread mandrel in the direction opposite to the product, and one end of the screw thread mandrel protrudes out of the slider and is provided with a screw thread of a thread structure for forming a product;

[0008] A first driving device, which is transmission-connected to the screw thread mandrel and is used to drive the screw thread mandrel to rotate, and under the elastic force of the spring, the screw thread mandrel moves in a direction away from the product while rotating, so that the screw thread is disengaged from the thread structure of the product;

[0009] A second driving device is arranged opposite to the other end of the screw thread core shaft and is used for driving the screw thread core shaft to reset.

[0010] As a further improvement of the present utility model, the first driving device includes a first mounting block, a first gear assembly, a second gear assembly and a motor. The motor is fixed on the first mounting block. The first gear assembly is mounted on the output shaft of the motor. The second gear assembly is mounted on the threaded core shaft and connected to the first gear assembly. The motor drives the threaded core shaft to rotate through the first gear assembly and the second gear assembly.

[0011] As a further improvement of the present utility model, the first gear assembly includes a first bevel gear. The second gear assembly includes a second bevel gear and a second sleeve. The second sleeve is sleeved on the threaded core shaft. The second bevel gear is fixed on the second sleeve and meshes with the first bevel gear.

[0012] As a further improvement of the present utility model, a circumferential limiting structure is provided between the second sleeve and the threaded core shaft. The circumferential limiting structure includes a convex block provided on the threaded core shaft and a limiting groove provided on the inner wall of the second sleeve along the axial direction. The convex block is located in the limiting groove, so that the threaded core shaft can rotate synchronously with the second sleeve, and the threaded core shaft can also move axially relative to the second sleeve.

[0013] As a further improvement of the present utility model, a second mounting block is fixed on one side of the first mounting block. The other end of the threaded core shaft passes through the first mounting block and extends towards the inside of the second mounting block. The second sleeve is arranged between the first mounting block and the second mounting block, and the axial movement of the second sleeve is restricted by the cooperation of the first mounting block and the second mounting block.

[0014] As a further improvement of the present utility model, the second driving device includes a push block and a power device. The push block is arranged opposite to the other end of the threaded core shaft and is fixedly connected to the power device. The power device is used to drive the push block to push the threaded core shaft to move axially.

[0015] As a further improvement of the present utility model, the push block is in a "C" shape. A chute is provided at the top of the second mounting block. The push block is slidably placed in the chute, and in the mold closing state, the other end of the threaded core shaft abuts against the inside of the push block.

[0016] As a further improvement of the present utility model, the power device is an oil cylinder or an electric cylinder.

[0017] As a further improvement of the present utility model, two photoelectric switches are arranged side by side along the axial direction of the threaded core shaft on the second mounting block. A detection block for cooperating with the two photoelectric switches is arranged on the threaded core shaft.

[0018] As a further improvement of the utility model, a first sleeve is fixed in the slider, the first sleeve and the spring are both mounted on the screw core shaft, an annular boss is provided in the middle of the screw core shaft, and the two ends of the spring are elastically abutted against the first sleeve and the annular boss respectively.

[0019] The beneficial effects of the utility model are as follows: the utility model provides a screw thread rotary demolding mechanism, which drives the screw thread core shaft to rotate and retreat while being driven by a first driving device in cooperation with a spring, and when the mold is opened, the inclined guide column drives the sliding block to drive the screw thread core shaft to completely disengage from the product, and when the mold is closed, there is no need for the first driving device to drive the screw thread core shaft to rotate forward, but the second driving device directly pushes the screw thread core shaft forward to reset, and the next cycle of product production can be carried out, which can greatly shorten the product manufacturing cycle, improve production efficiency, and greatly improve the stability and reliability of the mechanism operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the screw thread rotary demoulding mechanism of the utility model;

[0021] Figure 2 A three-dimensional diagram of the screw thread rotary demoulding mechanism of the utility model from another perspective;

[0022] Figure 3 It is a three-dimensional diagram of the connection between the screw thread core shaft and the first driving device of the screw thread rotary demoulding mechanism of the utility model;

[0023] Figure 4 It is an exploded view of the screw thread spindle and the second gear assembly of the screw thread rotary demoulding mechanism of the utility model;

[0024] Figure 5 It is a three-dimensional diagram of the second driving device of the screw thread rotary demoulding mechanism of the utility model.

[0025] Combined with the accompanying drawings, the following description is given:

[0026] 1. Slider; 2. Inclined guide column; 3. Screw core shaft; 301. Screw thread; 302. Bump; 303. Annular boss; 4. Spring; 5. First mounting block; 6. Motor; 7. First bevel gear; 8. Second bevel gear; 9. Second bushing; 901. Limiting groove; 10. Second mounting block; 1001. Slide groove; 11. Push block; 12. Power device; 13. Photoelectric switch; 14. Detection block; 15. First bushing. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] See also Figures 1 to 5The utility model provides a screw thread rotary demoulding mechanism, which is applied to an injection mold, and comprises: a slider 1, a screw thread core shaft 3, a first driving device and a second driving device.

[0029] Among them, the slider 1 is slidably installed on the back mold of the injection mold, and an inclined guide column 2 is fixed on the front mold of the injection mold. When the front mold and the back mold of the injection mold open and close, the slider 1 can be driven by the inclined guide column 2 to slide in a direction perpendicular to the opening and closing of the mold.

[0030] Furthermore, a through hole is provided in the middle of the slider 1 along its sliding direction, and the screw thread mandrel 3 is inserted into the through hole of the slider 1 by sliding along the sliding direction of the slider 1, and both ends of the screw thread mandrel 3 extend out of the slider 1. One end of the screw thread mandrel 3 extends into the cavity of the injection mold and is provided with a screw thread 301 for forming the thread structure of the product; the other end of the screw thread mandrel 3 extends in the direction opposite to the product.

[0031] In addition, a spring 4 is installed between the slider 1 and the screw thread core shaft 3, and the spring 4 always applies an elastic force to the screw thread core shaft 3 in the direction opposite to the product.

[0032] Furthermore, the first driving device is connected to the screw thread mandrel 3 in a transmission manner, and is used to drive the screw thread mandrel 3 to rotate, and under the elastic force of the spring 4, the screw thread mandrel 3 rotates and moves in the direction opposite to the product, that is, the core pulling direction, so that the screw thread 301 is disengaged from the thread structure of the product. The second driving device is arranged opposite to the other end of the screw thread mandrel 3, and is used to drive the screw thread mandrel 3 to reset.

[0033] In the mold closing injection state, the screw core shaft 3 is pressed by the second driving device to prevent the screw core shaft 3 from retreating during the injection process. After the product is injection molded and cooled, the second driving device retreats in the core pulling direction, leaves the screw core shaft 3, and gives the screw core shaft 3 movement space; then the first driving device drives the screw core shaft 3 to rotate, and the screw core shaft 3 moves in the core pulling direction under the elastic force of the spring 4, so that the screw 301 is disengaged from the thread structure of the product (the end of the screw core shaft 3 is not completely pulled out of the product at this time); finally, the front mold and the rear mold are relatively opened, and the inclined guide column 2 drives the slider 1 to drive the screw core shaft 3 to continue to move in the core pulling direction until the screw core shaft 3 is completely disengaged from the product. When the mold is closed, the second driving device directly pushes the screw core shaft 3 forward to reset, and the next cycle of product production can be carried out, without the need for the first driving device to drive the screw core shaft 3 to rotate forward, thereby shortening the product manufacturing cycle, improving production efficiency, and greatly improving the stability and reliability of the mechanism operation.

[0034] See also Figure 2 and Figure 3A first sleeve 15 is fixed in the through hole of the slider 1. The first sleeve 15 and the spring 4 are both mounted on the screw core shaft 3. An annular boss 303 is provided in the middle of the screw core shaft 3. Both ends of the spring 4 elastically abut against the first sleeve 15 and the annular boss 303 respectively. Therefore, the spring 4 can always apply an elastic force in the core pulling direction to the screw core shaft 3, so that the screw core shaft 3 can rotate while retreating under the action of the spring 4.

[0035] See also Figure 1 and Figure 2 The first driving device includes a first mounting block 5, a first gear assembly, a second gear assembly and a motor 6. The first mounting block 5 is fixed to one side of the back mold of the injection mold. The motor 6 is fixed to the first mounting block 5 in the vertical direction. The first gear assembly is installed on the output shaft of the motor 6. The second gear assembly is installed on the screw core shaft 3 and is connected to the first gear assembly. The motor 6 drives the screw core shaft 3 to rotate through the first gear assembly and the second gear assembly.

[0036] like Figure 3 As shown, the first gear assembly includes a first bevel gear 7, which is fixed on the output shaft of the motor 6. The second gear assembly includes a second bevel gear 8 and a second sleeve 9, which is sleeved on the screw core shaft 3, and the second bevel gear 8 is fixedly sleeved on the second sleeve 9 and meshes with the first bevel gear 7. The axis of the first bevel gear 7 is perpendicular to the axis of the second bevel gear 8.

[0037] In addition, a circumferential limiting structure is provided between the second sleeve 9 and the screw thread core shaft 3. Figure 4 As shown, the circumferential limiting structure includes a protrusion 302 provided on the screw thread core shaft 3 and a limiting groove 901 provided on the inner wall of the second sleeve 9 along the axial direction, and the protrusion 302 is located in the limiting groove 901. Under the cooperation of the protrusion 302 and the limiting groove 901, when the motor 6 drives the first bevel gear 7 to drive the second bevel gear 8 to rotate, the second bevel gear 8 drives the screw thread core shaft 3 to rotate synchronously through the second sleeve 9, and the screw thread core shaft 3 can also make axial movement relative to the second sleeve 9, so that the screw thread core shaft 3 can rotate while retreating under the action of the spring 4.

[0038] See again Figure 1 and Figure 2 A second mounting block 10 is fixed to one side of the first mounting block 5, the other end of the screw thread mandrel 3 passes through the first mounting block 5 and extends toward the second mounting block 10, and linear bearings are installed between the screw thread mandrel 3 and the first mounting block 5 and the second mounting block 10. The second sleeve 9 is arranged between the first mounting block 5 and the second mounting block 10, and the second sleeve 9 is cooperated by the first mounting block 5 and the second mounting block 10 to limit its axial movement.

[0039] See also Figure 1 and Figure 5, the second driving device includes a pushing block 11 and a power device 12. The pushing block 11 is disposed opposite to the other end of the screw core shaft 3 and fixedly connected to the power device 12. The power device 12 is used to drive the pushing block 11 to push the screw core shaft 3 to move axially. It should be noted that there is no rigid connection between the pushing block 11 and the screw core shaft 3. When core pulling is required, the power device 12 drives the pushing block 11 to retreat, creating a core pulling space for the screw core shaft 3; when resetting is required, the power device 12 drives the pushing block 11 to push the screw core shaft 3 for resetting.

[0040] In the present utility model, the pushing block 11 is in a "C" shape. A sliding groove 1001 is provided at the top of the second mounting block 10. The pushing block 11 is slidably placed in the sliding groove 1001. In the mold closing state, the other end of the screw core shaft 3 abuts against the inside of the pushing block 11.

[0041] Optionally, the power device 12 is an oil cylinder or an electric cylinder. In this embodiment, an oil cylinder is preferably used.

[0042] Refer to Figure 2 and Figure 3 , two photoelectric switches 13 are arranged side by side along the axial direction of the screw core shaft 3 on the second mounting block 10. A detection block 14 for cooperating with the two photoelectric switches 13 is provided on the screw core shaft 3. When the mold is closed, the detection block 14 is opposite to one of the photoelectric switches 13; during the core pulling process, when the motor 6 drives the screw core shaft 3 to move in the core pulling direction until the detection block 14 moves to be opposite to the other photoelectric switch 13, after the other photoelectric switch 13 senses the detection block 14, the control system controls the motor 6 to stop, and then the front mold and the rear mold of the injection mold are opened relative to each other.

[0043] It can be seen that the present utility model provides a screw thread rotating demolding mechanism. By the cooperation of the first driving device and the spring 4, the screw core shaft 3 is driven to rotate and retreat simultaneously, and when the mold is opened, the inclined guide post 2 drives the slider 1 to drive the screw core shaft 3 to completely disengage from the product. Moreover, when the mold is closed, it is not necessary for the first driving device to drive the screw core shaft 3 to rotate forward anymore. Instead, the second driving device directly pushes the screw core shaft 3 forward for resetting, and then the production of the next cycle of products can be carried out. This can greatly shorten the manufacturing cycle of the products, improve production efficiency, and significantly enhance the stability and reliability of the mechanism operation.

[0044] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A screw thread rotary demoulding mechanism, characterized in that: include: A slider (1), wherein the slider (1) can be driven by an inclined guide column (2) to slide in a direction perpendicular to the mold opening and closing direction when the mold is opened and closed; A screw thread core shaft (3) is slidably inserted into the slider (1) along the sliding direction of the slider (1), and a spring (4) is installed between the slider (1) and the screw thread core shaft (3), and the spring (4) always applies an elastic force to the screw thread core shaft (3) in the direction opposite to the product, and one end of the screw thread core shaft (3) protrudes out of the slider (1) and is provided with a screw thread (301) of a thread structure for forming a product; A first driving device, the first driving device is drivingly connected to the screw thread core shaft (3), and is used to drive the screw thread core shaft (3) to rotate, and under the elastic force of the spring (4), the screw thread core shaft (3) moves in a direction away from the product while rotating, so that the screw thread (301) is disengaged from the thread structure of the product; A second driving device, the second driving device is arranged opposite to the other end of the screw thread core shaft (3) and is used for driving the screw thread core shaft (3) to reset.

2. The screw thread rotary demoulding mechanism according to claim 1, characterized in that: The first driving device comprises a first mounting block (5), a first gear assembly, a second gear assembly and a motor (6); the motor (6) is fixed on the first mounting block (5); the first gear assembly is mounted on an output shaft of the motor (6); the second gear assembly is mounted on the screw thread spindle (3) and is connected to the first gear assembly; the motor (6) drives the screw thread spindle (3) to rotate via the first gear assembly and the second gear assembly.

3. The screw thread rotary demoulding mechanism according to claim 2, characterized in that: The first gear assembly comprises a first bevel tooth (7), and the second gear assembly comprises a second bevel tooth (8) and a second sleeve (9), wherein the second sleeve (9) is sleeved on the screw thread core shaft (3), and the second bevel tooth (8) is fixed on the second sleeve (9) and meshes with the first bevel tooth (7).

4. The screw thread rotary demoulding mechanism according to claim 3, characterized in that: A circumferential limiting structure is provided between the second sleeve (9) and the screw core shaft (3), the circumferential limiting structure comprising a protrusion (302) provided on the screw core shaft (3) and a limiting groove (901) provided on the inner wall of the second sleeve (9) along the axial direction, the protrusion (302) being located in the limiting groove (901), so that the screw core shaft (3) can rotate synchronously with the second sleeve (9), and the screw core shaft (3) can also make axial movement relative to the second sleeve (9).

5. The screw thread rotary demoulding mechanism according to claim 3, characterized in that: A second mounting block (10) is fixed to one side of the first mounting block (5); the other end of the threaded core shaft (3) passes through the first mounting block (5) and extends toward the second mounting block (10); the second shaft sleeve (9) is arranged between the first mounting block (5) and the second mounting block (10); and the second shaft sleeve (9) is restricted in axial movement by the cooperation of the first mounting block (5) and the second mounting block (10).

6. The screw thread rotary demoulding mechanism according to claim 5, characterized in that: The second driving device includes a pushing block (11) and a power device (12). The pushing block (11) is disposed opposite to the other end of the threaded core shaft (3) and fixedly connected to the power device (12). The power device (12) is used to drive the pushing block (11) to push the threaded core shaft (3) to move axially.

7. The screw thread rotary demoulding mechanism according to claim 6, characterized in that: The pushing block (11) is in a "C" shape. A chute (1001) is provided at the top of the second mounting block (10). The pushing block (11) is slidably disposed in the chute (1001). And in the mold closing state, the other end of the threaded core shaft (3) abuts against the inside of the pushing block (11).

8. The screw thread rotary demoulding mechanism according to claim 6, characterized in that: The power device (12) is an oil cylinder or an electric cylinder.

9. The screw thread rotary demoulding mechanism according to claim 5, characterized in that: Two photoelectric switches (13) are arranged side by side along the axial direction of the threaded core shaft (3) on the second mounting block (10). A detection block (14) for cooperating with the two photoelectric switches (13) is provided on the threaded core shaft (3).

10. The screw thread rotary demoulding mechanism according to claim 1, characterized in that: A first bushing (15) is fixed inside the slider (1). Both the first bushing (15) and the spring (4) are sleeved on the threaded core shaft (3). An annular boss (303) is provided in the middle of the threaded core shaft (3). The two ends of the spring (4) are elastically abutted against the first bushing (15) and the annular boss (303) respectively.

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