Mechanical synchronous drive thread core-pulling mechanism

Abstract

The utility model belongs to the technical field of injection molds, and particularly discloses a mechanical synchronous drive thread core-pulling mechanism which comprises an upper mold fixedly mounted at the injection molding end of an injection molding machine and a lower mold mounted at the moving end of the injection molding machine, the bottom of the upper die is provided with a pair of cavities used for forming products and provided with rotation stopping grooves, the top of the lower die is provided with a pair of threaded blocks used for forming threads on the formed products and inserted into the cavities, fixing cylinders are rotationally connected to the positions, corresponding to the threaded blocks, in the driving cavity, and the top ends of the fixing cylinders penetrate through the lower die and are fixedly connected with rectangular cylinders. According to the utility model, the screwing-out direction of the core-pulling mechanism can be flexibly adjusted according to the requirements of produced products, so that the core-pulling mechanism can be suitable for different complex injection molding parts, the universality of the device is improved, the thread mold can be quickly replaced, the production efficiency is improved, and the production cost is reduced. The production efficiency of the device is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and in particular relates to a mechanical synchronously driven screw thread core pulling mechanism. Background Art

[0002] In the process of injection mold production, in order to quickly remove the product with thread from the mold, a core pulling mechanism is set to unscrew the finished threaded product from the mold, which can effectively improve production efficiency and save labor costs.

[0003] The prior art discloses a mechanical synchronously driven screw core pulling mechanism with publication number CN211518310U. The screw core pulling mechanism utilizes the mold opening force of the front mold plate when the mold is opened to drive it to complete the core pulling action, thereby ensuring sufficient output power when the core is pulled. The screw core pulling mechanism does not require the use of an oil cylinder or a motor, thereby reducing the overall size of the mold and the manufacturing cost of the mold. The screw core pulling mechanism synchronously completes the core pulling action during the mold opening process, thereby solving the problem that the product will rotate with the screw. The screw core pulling mechanism is simple to process, easy to install and has high operating stability.

[0004] Although the core pulling action can be performed on the threaded product while the mold is opened, there are still some defects in actual use. Since the template moves downward and the gear rotates through the rack to drive the product to be screwed out, the screwing direction of the product is fixed. This method has certain limitations. It can only screw out the threaded products with positive threads, and cannot be flexibly adjusted according to production needs to screw out the threaded products with negative threads, and cannot meet the production needs of complex injection molded parts. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a mechanical synchronously driven screw thread core pulling mechanism.

[0006] In order to achieve the above purpose, the utility model provides a mechanical synchronously driven screw thread core pulling mechanism, an upper mold fixedly installed at the injection end of an injection molding machine, and a lower mold installed at the moving end of the injection molding machine, a driving cavity is opened inside the lower mold, a pair of cavities for molding products and anti-rotation grooves are provided at the bottom of the upper mold, a pair of thread blocks for forming screw threads on the molded products are provided at the top of the lower mold and inserted into the cavities, a fixed cylinder is rotatably connected in the driving cavity and at positions corresponding to the thread blocks, a rectangular cylinder is fixedly connected to the top of the fixed cylinder through the lower mold, a rectangular groove adapted to the rectangular cylinder is opened at the bottom of the thread block, and a disassembly mechanism for replacing the thread block is provided in the fixed cylinder;

[0007] The bottom end of the outer wall of the fixed cylinder is fixedly connected with a driven gear, the bottom of the driving cavity and located between the driven gears is rotatably connected with a driving gear meshing with it, an adjusting rod is penetrated at the top of the driving gear, a screw is threadedly connected at the bottom of the lower mold, and the top of the screw is rotatably connected to the bottom of the adjusting rod, an F-shaped frame is fixedly connected to the top of the driving cavity, and a rotating cylinder is rotatably connected on the extended end of the F-shaped frame, the top of the adjusting rod penetrates the rotating cylinder, the outer wall of the rotating cylinder is fixedly connected with an adjusting bevel gear, a driving bevel gear is arranged between the adjusting bevel gears and meshes with them, and a driving mechanism for synchronously driving the driving bevel gear to rotate is provided on the lower mold;

[0008] A pair of limit holes are provided on the side away from the rotating cylinder, and the upper and lower ends of the outer wall of the adjusting rod are fixedly connected to the limit plates. The side of the limit plates close to each other is fixedly connected with limit pins that are compatible with the limit holes, and one pair of the limit pins is inserted in the limit holes. Pins are fixedly connected on both sides of the outer wall of the adjusting rod at positions corresponding to the driving gear, and a socket is provided on the top of the driving gear at a position corresponding to the pin.

[0009] Preferably, the driving mechanism includes a moving gear, a pair of racks are fixedly connected to the side wall of the upper mold, a pair of fixed seats are fixedly connected to the side wall of the lower mold, a transmission rod is rotatably connected to the fixed seat, the moving gear is fixedly connected to both sides of the transmission rod and meshes with the racks, the side wall of the lower mold is rotatably connected to a transmission bevel gear, the outer wall of the transmission rod is fixedly connected to an external bevel gear meshing with the transmission bevel gear, the transmission bevel gear and the driving bevel gear are fixedly connected with a connecting rod and are arranged through the driving cavity.

[0010] Preferably, a support seat is fixedly connected to the top of the driving cavity, and the connecting rod passes through and is rotatably connected to the inner wall of the support seat.

[0011] Preferably, the disassembly and assembly mechanism includes a positioning pin and a pulling pin, the pulling pin is slidably connected to the bottom of the fixed cylinder, the top of the pulling pin is fixedly connected with an extrusion block located in the rectangular cylinder, the positioning pin passes through and is slidably connected on both sides of the rectangular cylinder, a positioning groove is provided on the inner side of the rectangular groove at a position corresponding to the positioning pin, and a spring is fixedly connected between the bottom end of the fixed cylinder and the outer wall of the pulling pin. When squeezed and fixed, the spring force pushes the pulling pin and the extrusion block to slide upward, squeezing the positioning pin into the positioning groove to fix the two.

[0012] Preferably, both ends of the positioning pin and the top of the extrusion block are configured as smooth arc surfaces.

[0013] Preferably, a through hole is provided at the bottom of the lower mold at a position corresponding to the pulling pin, and the bottom of the pulling pin passes through the through hole and is arranged at the bottom of the lower mold.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The screwing direction of the core pulling mechanism can be flexibly adjusted according to the needs of the production products, so that it can be applied to different complex injection molded parts, improve the universal performance of the device, and also can quickly replace the screw thread mold to improve the production efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall appearance structure of the injection mold of the utility model;

[0017] Figure 2 This is a schematic diagram of the overall appearance of the core-pulling mechanism of the utility model;

[0018] Figure 3 This is a schematic diagram of the front full-section three-dimensional structure of the injection mold of the utility model;

[0019] Figure 4 For this utility model Figure 3 A local enlarged structural schematic diagram;

[0020] Figure 5 This is a schematic diagram of the three-dimensional structure of the front side of the fixed cylinder of the utility model;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the injection mold of the utility model in full section from the side.

[0022] In the figure: 1. upper mold; 2. lower mold; 3. driving cavity; 4. cavity; 5. threaded block; 6. fixed cylinder; 7. rectangular cylinder; 8. rectangular groove; 9. driven gear; 10. driving gear; 11. adjusting rod; 12. screw; 13. F-type frame; 14. rotating cylinder; 15. adjusting bevel gear; 16. driving bevel gear; 17. limiting hole; 18. limiting plate; 19. limiting pin; 20. latch; 21. socket; 22. rack; 23. moving gear; 24. fixed seat; 25. transmission rod; 26. transmission bevel gear; 27. external bevel gear; 28. connecting rod; 29. ​​supporting seat; 30. positioning pin; 31. pulling pin; 32. extrusion block; 33. positioning groove; 34. spring; 35. through hole. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] like Figure 1-Figure 6A mechanical synchronously driven screw thread core pulling mechanism shown in the figure comprises an upper mold 1 fixedly installed at the injection end of an injection molding machine, and a lower mold 2 installed at the moving end of the injection molding machine, a driving cavity 3 is provided inside the lower mold 2, a pair of cavities 4 for molding products and with anti-rotation grooves are provided at the bottom of the upper mold 1, a pair of thread blocks 5 for forming the upper threads of the molded products are provided at the top of the lower mold 2 and are inserted into the cavities 4, a fixed cylinder 6 is rotatably connected in the driving cavity 3 and at positions corresponding to the thread blocks 5, a rectangular cylinder 7 is fixedly connected to the top of the fixed cylinder 6 through the lower mold 2, a rectangular groove 8 adapted to the rectangular cylinder 7 is provided at the bottom of the thread block 5, and a disassembly mechanism for replacing the thread block 5 is provided in the fixed cylinder 6;

[0025] The bottom end of the outer wall of the fixed cylinder 6 is fixedly connected with a driven gear 9, and a driving gear 10 meshing with the driven gear 9 is rotatably connected at the bottom of the driving cavity 3 and located between the driven gears 9. An adjusting rod 11 is penetrated on the top of the driving gear 10, and an F-shaped frame 13 is fixedly connected to the top of the driving cavity 3. A rotating cylinder 14 is rotatably connected on the extended end of the F-shaped frame 13. The top of the adjusting rod 11 penetrates the rotating cylinder 14, and the outer wall of the rotating cylinder 14 is fixedly connected with an adjusting bevel gear 15. A driving bevel gear 16 is provided between the adjusting bevel gears 15 and meshed with them. A driving mechanism for synchronously driving the driving bevel gear 16 to rotate is provided on the lower mold 2;

[0026] The driving mechanism includes a moving gear 23, a pair of racks 22 are fixedly connected to the side wall of the upper mold 1, a pair of fixed seats 24 are fixedly connected to the side wall of the lower mold 2, a transmission rod 25 is rotatably connected to the fixed seat 24, the moving gear 23 is fixedly connected to both sides of the transmission rod 25 and meshes with the rack 22, a transmission bevel gear 26 is rotatably connected to the side wall of the lower mold 2, an external bevel gear 27 meshing with the transmission bevel gear 26 is fixedly connected to the outer wall of the transmission rod 25, the transmission bevel gear 26 and the driving bevel gear 16 are fixedly connected with a connecting rod 28 and are arranged through the driving cavity 3, a support seat 29 is fixedly connected to the top of the driving cavity 3, and the connecting rod 28 is rotatably connected to the inner wall of the support seat 29. The arrangement of the support seat 29 can improve the stability of the connecting rod 28 when rotating;

[0027] When the injection molding of the product is completed and the mold is opened and demolded, the product gradually moves away from the lower mold 2 along with the upper mold 1, and then the meshing moving gear 23 is driven to rotate through the rack 22, thereby driving the transmission rod 25 and the external bevel gear 27 to rotate synchronously, thereby driving the meshing transmission bevel gear 26 to rotate, and at the same time driving the driving bevel gear 16 to rotate through the connecting rod 28, thereby driving the two meshing adjusting bevel gears 15 to rotate in opposite directions. At this time, since one of the pairs of limit pins 19 is inserted in one of the pairs of limit holes 17, the adjusting rod 11 and the driving gear 10 are driven to rotate through the limit plate 18, thereby driving the meshing driven gear 9 to rotate, and at the same time driving the thread block 5 to rotate, and then the lower mold 2 moves out of the product, realizing the synchronous completion of mold opening and screw thread core pulling.

[0028] A pair of limiting holes 17 are provided on the side away from the rotating cylinder 14, and the upper and lower ends of the outer wall of the adjusting rod 11 are fixedly connected to the limiting plates 18, and the side close to the limiting plates 18 is fixedly connected to the limiting pins 19 adapted to the limiting holes 17, and one pair of limiting pins 19 is inserted into the limiting holes 17, and the two sides of the outer wall of the adjusting rod 11 are fixedly connected to the positions corresponding to the driving gear 10 with the latch pins 20, and the top of the driving gear 10 is provided with a plug hole 21 at the position corresponding to the latch pin 20, and the bottom of the lower mold 2 is threadedly connected to the screw 12, and the top of the screw 12 is rotatably connected to the bottom of the adjusting rod 11;

[0029] When it is necessary to produce reverse-threaded products according to production needs, first rotate the screw 12 to move it spirally downward, thereby driving the adjusting rod 11 and the limit plate 18 to move downward, so that the limit pin 19 at the bottom slides out of the limit hole 17, and at the same time drives the limit pin 19 at the top to be inserted into the corresponding limit hole 17, so that the adjusting rod 11 can rotate with the adjusting bevel gear 15 at the top. Since the upper and lower adjusting bevel gears 15 rotate in opposite directions under the drive of the driving bevel gear 16, the direction of screwing out of the thread block 5 is changed, which can be suitable for the production of different complex injection molded parts. When adjusting, just rotate the screw 12 in the opposite direction.

[0030] like Figure 5 , Figure 6As shown, in order to facilitate the rapid replacement of the threaded block 5, the disassembly and assembly mechanism includes a positioning pin 30 and a pulling pin 31, the pulling pin 31 is slidably connected to the bottom of the fixed cylinder 6, and an extrusion block 32 is fixedly connected to the top of the pulling pin 31 and located in the rectangular cylinder 7, the positioning pin 30 passes through and is slidably connected to both sides of the rectangular cylinder 7, a positioning slot 33 is provided on the inner side of the rectangular slot 8 and at a position corresponding to the positioning pin 30, a spring 34 is fixedly connected between the bottom end of the fixed cylinder 6 and the outer wall of the pulling pin 31, when extruded and fixed, the elastic force of the spring 34 pushes the pulling pin 31 and the extrusion block 32 to slide upward, and the extrusion positioning pin 30 is inserted into the positioning slot 33 to fix the two, both ends of the positioning pin 30 and the top of the extrusion block 32 are set as smooth arc surfaces, a through hole 35 is provided at the bottom of the lower mold 2 and at a position corresponding to the pulling pin 31, and the setting of the through hole 35 avoids hindering the rotation of the pulling pin 31 driven by the fixed cylinder, and the bottom of the pulling pin 31 passes through the through hole 35 and is set at the bottom of the lower mold 2;

[0031] When the corresponding thread block 5 needs to be replaced according to production needs to produce reverse-thread screw products, first pull the pull pin 31 downward to drive the extrusion block 32 to slide downward, and at the same time squeeze the spring 34 to release the squeezing of the positioning pin 30, and then pull the thread block 5 upward to squeeze the smooth surface of the positioning pin 30 to slide in the rectangular tube 7, and then take out the thread block 5 for replacement, and then insert the replaced thread block 5 into the outer wall of the rectangular tube 7, and finally release the pull pin 31, and then the elastic force of the spring 34 pushes the pull pin 31 and the extrusion block 32 to slide upward, so that the positioning pin 30 is squeezed to both sides through the smooth surface of the top of the extrusion block 32 and inserted into the positioning groove 33, so that the position of the thread block 5 is fixed, thereby realizing the rapid replacement of the thread block 5.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A mechanical synchronously driven screw thread core pulling mechanism, characterized in that: An upper mold (1) fixedly installed at the injection end of an injection molding machine, and a lower mold (2) installed at the moving end of the injection molding machine, wherein a driving cavity (3) is provided inside the lower mold (2), a pair of cavities (4) for molding products and having a rotation-stopping groove are provided at the bottom of the upper mold (1), a pair of thread blocks (5) for forming thread teeth on the molded products are provided at the top of the lower mold (2) and are inserted into the cavities (4), a fixed cylinder (6) is rotatably connected in the driving cavity (3) and at positions corresponding to the thread blocks (5), the top end of the fixed cylinder (6) passes through the lower mold (2) and is fixedly connected to a rectangular cylinder (7), a rectangular groove (8) adapted to the rectangular cylinder (7) is provided at the bottom of the thread block (5), and a disassembly and assembly mechanism for replacing the thread block (5) is provided in the fixed cylinder (6); The bottom end of the outer wall of the fixed cylinder (6) is fixedly connected with a driven gear (9); the bottom of the driving chamber (3) is rotatably connected with a driving gear (10) located between the driven gears (9); the top of the driving gear (10) is penetrated by an adjusting rod (11); the bottom of the lower mold (2) is threadedly connected with a screw rod (12); the top of the screw rod (12) is rotatably connected to the bottom of the adjusting rod (11); the top of the driving chamber (3) is fixedly connected with an F-shaped frame (13); the protruding end of the F-shaped frame (13) is rotatably connected with a rotating cylinder (14); the top of the adjusting rod (11) passes through the rotating cylinder (14); the outer wall of the rotating cylinder (14) is fixedly connected with an adjusting bevel gear (15); a driving bevel gear (16) is provided between the adjusting bevel gears (15) and is meshed with the driving bevel gear (16); the lower mold (2) is provided with a driving mechanism for synchronously driving the driving bevel gear (16) to rotate; A pair of limiting holes (17) are provided on the side away from the rotating cylinder (14); the upper and lower ends of the outer wall of the adjusting rod (11) are fixedly connected to limiting plates (18); the side close to the limiting plate (18) is fixedly connected to limiting pins (19) matched with the limiting holes (17), and one pair of the limiting pins (19) is inserted into the limiting holes (17); plug pins (20) are fixedly connected on both sides of the outer wall of the adjusting rod (11) at positions corresponding to the driving gear (10); and a plug hole (21) is provided on the top of the driving gear (10) at a position corresponding to the plug pin (20).

2. A mechanical synchronously driven screw thread core pulling mechanism according to claim 1, characterized in that: The driving mechanism comprises a moving gear (23), a pair of racks (22) are fixedly connected to the side wall of the upper mold (1), a pair of fixed seats (24) are fixedly connected to the side wall of the lower mold (2), a transmission rod (25) is rotatably connected to the fixed seat (24), the moving gear (23) is fixedly connected to both sides of the transmission rod (25) and meshes with the racks (22), the side wall of the lower mold (2) is rotatably connected to a transmission bevel gear (26), an outer wall of the transmission rod (25) is fixedly connected to an external bevel gear (27) meshing with the transmission bevel gear (26), and the transmission bevel gear (26) and the driving bevel gear (16) are fixedly connected to a connecting rod (28) and are arranged through the driving cavity (3).

3. A mechanical synchronously driven screw thread core pulling mechanism according to claim 2, characterized in that: The top of the driving chamber (3) is fixedly connected to a support seat (29), and the connecting rod (28) penetrates and is rotatably connected to the inner wall of the support seat (29).

4. The mechanical synchronously driven screw thread core pulling mechanism according to claim 1, characterized in that: The disassembly and assembly mechanism comprises a positioning pin (30) and a pulling pin (31); the pulling pin (31) is slidably connected to the bottom of the fixed cylinder (6); a squeezing block (32) is fixedly connected to the top of the pulling pin (31) and located in the rectangular cylinder (7); the positioning pin (30) penetrates and is slidably connected to both sides of the rectangular cylinder (7); a positioning groove (33) is provided on the inner side of the rectangular groove (8) and at a position corresponding to the positioning pin (30); a spring (34) is fixedly connected between the inner bottom end of the fixed cylinder (6) and the outer wall of the pulling pin (31); when squeezed and fixed, the elastic force of the spring (34) pushes the pulling pin (31) and the squeezing block (32) to slide upwards, squeezing the positioning pin (30) to be inserted into the positioning groove (33) to fix the two.

5. A mechanical synchronously driven screw thread core pulling mechanism according to claim 4, characterized in that: Both ends of the positioning pin (30) and the top of the extrusion block (32) are configured as smooth arc surfaces.

6. A mechanical synchronously driven screw thread core pulling mechanism according to claim 4, characterized in that: A through hole (35) is provided at the bottom of the lower mold (2) and at a position corresponding to the pulling pin (31), and the bottom of the pulling pin (31) passes through the through hole (35) and is arranged at the bottom of the lower mold (2).

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