Rotary side core pulling mechanism

Abstract

The present application relates to a kind of rotating lateral core-pulling mechanism, including first power source, second power source, slider on movable mould and several rotating shafts, the end of rotating shaft is provided in slider, one end of rotating shaft is equipped with the thread forming portion that makes product internal thread forming, the other end of rotating shaft is equipped with thread cooperation portion, the pitch of thread cooperation portion is equal with the pitch of thread forming portion, rotating shaft nut is installed on thread cooperation portion, rotating shaft nut is connected and fixed with movable mould, the side of slider is equipped with slider forming portion, which makes product reverse buckle forming, first power source drives rotating shaft to rotate, rotating shaft is removed simultaneously relative to rotating shaft nut, slider, movable mould, so that thread forming portion is separated from product;Second power source drives slider to remove core-pulling, so that slider forming portion is separated from product.In the present application, thread core-pulling and lateral reverse buckle core-pulling process are stable and reliable, prevent product from being damaged when core-pulling, greatly reduce the scrap rate, and the structure is simple.

Description

Technical Field

[0001] This invention relates to a rotating lateral core-pulling mechanism, belonging to the field of injection mold technology. Background Technology

[0002] After injection molding, the holes, bosses, and threads on the product, which are undercut, need to be removed before demolding because they are not in the same direction as the mold opening or cannot be directly demolded. Existing technologies typically use slides, angled ejectors, and ejector pins to help demold holes and bosses, but these structures are not suitable for threaded parts. Forcibly removing the core from threaded parts can easily damage the product, resulting in a high scrap rate. When the product has both threads and lateral undercuts, core removal becomes even more difficult, and current technologies struggle to achieve this. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a stable and reliable rotary lateral core-pulling mechanism for threaded core-pulling and lateral reverse-clamping core-pulling processes.

[0004] To achieve the objective, the technical solution adopted by this invention is: A rotary lateral core-pulling mechanism includes a first power source, a second power source, a slider located on a moving mold, and several rotating shafts. The ends of the rotating shafts pass through the slider. One end of each rotating shaft has a thread-forming portion for forming internal threads on the product, and the other end has a threaded mating portion. The pitch of the threaded mating portion is equal to the pitch of the thread-forming portion. A rotating shaft nut is fitted onto the threaded mating portion and is fixedly connected to the moving mold. The side of the slider has a slider forming portion for forming an undercut on the product. The first power source drives the rotating shafts to rotate. Simultaneously, the rotating shafts move backward relative to the rotating shaft nut, the slider, and the moving mold, causing the thread-forming portion to detach from the product. The second power source drives the slider to move backward to pull the core, causing the slider forming portion to detach from the product.

[0005] As a further optimization of the above technical solution: the first power source is located outside the moving mold. The first power source includes a hydraulic cylinder, a rack, and a gear transmission assembly. The hydraulic cylinder is fixed to the side of the moving mold. The gear transmission assembly includes a first gear meshing with the rack, a second gear coaxially fixed with the first gear, and a third gear sleeved on the rotating shaft. The third gear meshes with the second gear. The diameter of the second gear is larger than the diameter of the first gear. The hydraulic cylinder is connected to the rack and drives the rack to move laterally. The lateral movement of the rack drives the first gear to rotate, and the second gear rotates synchronously. The third gear is driven to rotate and causes the rotating shaft to start rotating to pull the core.

[0006] As a further optimization of the above technical solution: a guide rail fixing seat is fixed on the side of the moving mold, a movable groove is formed on the guide rail fixing seat, and protruding pressure plates are provided on both sides of the movable groove. The pressure plates make the movable groove form an I-shaped sliding groove. A guide slider is fixed at the end of the rack, and the piston rod of the oil cylinder is fixed to the guide slider. The oil cylinder drives the rack to move laterally through the guide slider, and the guide slider is slidably disposed in the I-shaped sliding groove.

[0007] As a further optimization of the above technical solution: both ends of the I-shaped slide are provided with limit blocks. When the guide block contacts the limit block, the guide block and the rack stop moving. At the same time, two limit switches are provided on the side of the guide rail fixing seat, and a moving limit strip is provided on the guide block. When the moving limit strip moves to contact the limit switch, the guide block and the rack stop moving.

[0008] As a further optimization of the above technical solution: an adjusting block is also sleeved at the end of the rotating shaft, a fixing block is provided on the side of the moving mold, the adjusting block is located between the fixing block and the rotating shaft nut, the adjusting block is fixed to the side of the fixing block, the rotating shaft nut is fixed to the adjusting block by two pressure blocks, the fixing block has several fixing grooves, each fixing groove is provided with a soft pad, both ends of the adjusting block are provided with fixing protrusions, the fixing protrusions are located in the fixing grooves, a spacer screw passes through the fixing protrusion, the end of the spacer screw passes through the soft pad and abuts against the bottom of the fixing groove, so that the two sides of the soft pad are respectively in close contact with the bottom of the fixing groove and the end face of the fixing protrusion, the pitch of the spacer screw is less than the pitch of the threaded mating part, rotating the spacer screw causes the adjusting block to move relative to the spacer screw, and drives the pressure block, the rotating shaft nut and the rotating shaft to move.

[0009] As a further optimization of the above technical solution: the pitch of the fixed-distance screw is 1mm, and the soft pad is made of polyurethane.

[0010] As a further optimization of the above technical solution: the rotating shaft adopts a segmented structure, and a connecting nut is sleeved on the rotating shaft. The rotating shaft includes a slider segment and a gear segment. One end of the slider segment is the threaded part, and the other end of the slider segment extends out of the slider and is provided with a first connecting thread segment. The end of the gear segment is provided with a second connecting thread segment. The connecting nut is threadedly fixed to both the first connecting thread segment and the second connecting thread segment.

[0011] As a further optimization of the above technical solution: a strip-shaped connecting groove is formed on the first connecting thread section, and a strip-shaped connecting protrusion is provided on the second connecting thread section, the connecting protrusion being located within the connecting groove.

[0012] As a further optimization of the above technical solution: the second power source includes an inclined guide post, which is obliquely inserted into the slider, and the top of the inclined guide post is connected and fixed to the fixed mold.

[0013] Compared with existing technologies, this invention uses a hydraulic cylinder to drive a rack and pinion to complete the threaded core pulling of the rotating shaft under the action of a gear transmission group before mold opening. Then, the mold is opened, and the slider moves backward under the guidance of the inclined guide post to complete the lateral undercut core pulling. The threaded core pulling and lateral undercut core pulling processes are stable and reliable, preventing product damage during core pulling and greatly reducing the scrap rate. The structure is simple. Since the front end of the rotating shaft needs to be sealed with the product surface, the threaded core pulling is completed before mold opening to prevent flash. A small-diameter first gear drives a large-diameter second gear to reduce the rotation speed and increase the torque. The clearance is adjusted by polyurethane soft pads and a spacer screw. Rotating the spacer screw allows for fine adjustment of the rotating shaft position to eliminate the front and rear clearance of the rotating shaft. The rotating shaft adopts a segmented structure and is assembled by connecting nuts. After loosening the connecting nuts, the gear segment and the slider segment are separated. At this time, the first power source can be removed from the moving mold as a whole, and the first power source is modularized for easy disassembly and assembly, and convenient for maintenance. The snap-fit ​​of the strip-shaped connecting protrusion and the connecting groove plays a role in preventing rotation between the slider segment and the gear segment. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 yes Figure 1 A magnified structural diagram of point A in the middle.

[0016] Figure 3 This is a schematic cross-sectional view of the moving mold side in this invention.

[0017] Figure 4 yes Figure 3 A magnified structural diagram at point B in the middle.

[0018] Figure 5 This is a three-dimensional structural diagram of the first power source, the second power source, the slider, and the rotating shaft in this invention.

[0019] Figure 6 This is an exploded structural diagram of the rotating shaft in this invention.

[0020] In the diagram, 1. Moving mold; 11. Protective cover; 12. Fixing block; 121. Fixing groove; 13. First positioning guide sleeve; 14. Second positioning guide sleeve; 15. Soft pad; 16. Spacing screw; 2. Slider; 21. Slider forming part; 3. Rotating shaft; 31. Thread forming part; 32. Thread mating part; 33. Adjusting block; 331. Fixing protrusion; 34. Rotating shaft nut; 35. Pressure block; 36. Slider section; 361. First connecting thread 362. Connecting groove; 37. Gear segment; 371. Second connecting thread segment; 372. Connecting protrusion; 38. Connecting nut; 4. Hydraulic cylinder; 5. Rack; 51. Guide block; 52. Moving limit bar; 6. Gear transmission group; 61. First gear; 62. Second gear; 63. Third gear; 7. Guide rail fixing seat; 71. Pressure plate; 72. I-beam slide; 73. Limit block; 74. Limit switch; 8. Inclined guide post. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. For example... Figure 1-6 As shown, a rotary lateral core-pulling mechanism includes a first power source, a second power source, a slider 2 located on a moving mold 1, and several rotating shafts 3. The ends of the rotating shafts 3 pass through the slider 2. One end of the rotating shaft 3 has a thread-forming part 31 for forming the internal thread of the product, and the other end of the rotating shaft 3 has a threaded mating part 32. The pitch of the threaded mating part 32 is equal to the pitch of the thread-forming part 31. A rotating shaft nut 34 is fitted onto the threaded mating part 32 and is fixedly connected to the moving mold 1. The side of the slider 2 has a slider-forming part 21 for forming the product undercut. The first power source drives the rotating shafts 3 to rotate. Simultaneously, the rotating shafts 3 move backward relative to the rotating shaft nut 34, the slider 2, and the moving mold 1, causing the thread-forming part 31 to detach from the product. The second power source drives the slider 2 to move backward to pull the core, causing the slider-forming part 21 to detach from the product. The number of rotating shafts 3 is the same as the number of internal threads on the product; in this application, there are two rotating shafts 3.

[0022] In the above technical solution: the first power source is located on the outside of the moving mold 1, and the first power source includes a hydraulic cylinder 4, a rack 5, and a gear transmission assembly 6. The hydraulic cylinder 4 is fixed to the side of the moving mold 1. Figure 5As shown, the gear transmission assembly 6 includes a first gear 61 meshing with a rack 5, a second gear 62 coaxially fixed with the first gear 61, and a third gear 63 sleeved on a rotating shaft 3. The third gear 63 meshes with the second gear 62, and the diameter of the second gear 62 is larger than the diameter of the first gear 61. The hydraulic cylinder 4 is connected to the rack 5 and drives the rack 5 to move laterally. The lateral movement of the rack 5 drives the first gear 61 to rotate, and simultaneously the second gear 62 rotates synchronously. The third gear 63 is driven to rotate, causing the rotating shaft 3 to begin rotating and pulling the core. Each rotating shaft 3 is sleeved with a third gear 63, and both third gears 63 mesh with the second gear 62. The two third gears 63 are spaced apart to avoid interference. The smaller diameter first gear 61 drives the larger diameter second gear 62, reducing the rotational speed and increasing the torque.

[0023] In the above technical solution: a guide rail fixing seat 7 is fixed to the side of the moving mold 1. A movable groove is formed on the guide rail fixing seat 7. Both sides of the movable groove are provided with protruding pressure plates 71, which make the movable groove form an I-shaped slide groove 72. A guide slider 51 is fixed to the end of the rack 5. The piston rod of the hydraulic cylinder 4 is fixed to the guide slider 51. The hydraulic cylinder 4 drives the rack 5 to move laterally through the guide slider 51. The guide slider 51 is slidably disposed in the I-shaped slide groove 72, which guides the lateral movement of the rack 5. Limit blocks 73 are provided at both ends of the I-shaped slide groove 72. When the guide slider 51 contacts the limit block 73, the guide slider 51 and the rack 5 stop moving. At the same time, two limit switches 74 are provided on the side of the guide rail fixing seat 7. A movable limit strip 52 is provided on the guide slider 51. When the movable limit strip 52 moves to contact the limit switch 74, the guide slider 51 and the rack 5 stop moving, which plays a double limiting role.

[0024] In the above technical solutions: such as Figure 2 , 4As shown, an adjusting block 33 is also fitted onto the end of the rotating shaft 3. A fixing block 12 is provided on the side of the moving mold 1. The adjusting block 33 is located between the fixing block 12 and the rotating shaft nut 34. The adjusting block 33 is fixed to the side of the fixing block 12. The rotating shaft nut 34 is fixed to the adjusting block 33 by two pressure blocks 35. Several fixing grooves 121 are formed on the fixing block 12. A soft pad 15 is provided in each fixing groove 121. Fixing protrusions 331 are provided at both ends of the adjusting block 33. The fixing protrusions 331 are located in the fixing grooves 121. A spacer screw 16 passes through the fixing protrusion 331. The end of the spacer screw 16 passes through the soft pad 15 and abuts against the bottom of the fixing groove 121, so that the two sides of the soft pad 15 are in close contact with the bottom of the fixing groove 121 and the end face of the fixing protrusion 331, respectively. The pitch of the spacer screw 16 is smaller than the pitch of the threaded mating part 32. The spacer screw 16 has fine threads, specifically 1mm, for easy high-precision adjustment. The soft pad 15 is made of polyurethane. Due to the assembly gap between the rack 5 and the gear transmission group 6, axial displacement of the rotating shaft 3 is easily caused, resulting in misalignment of the product's contact point and the formation of burrs. Therefore, the polyurethane soft pad 15 and the spacer screw 16 are used to adjust the gap. Rotating the spacer screw 16 causes the adjusting block 33 to move relative to the spacer screw 16, which in turn moves the pressure block 35, the rotating shaft nut 34, and the rotating shaft 3. Because the pitch of the spacer screw 16 is small, the movement distance is minimal, allowing for fine adjustment of the position of the rotating shaft 3 to eliminate the front and rear clearance of the rotating shaft 3.

[0025] In the above technical solution: the rotating shaft 3 adopts a segmented structure, and a connecting nut 38 is sleeved on the rotating shaft 3. The rotating shaft 3 includes a slider segment 36 and a gear segment 37, such as... Figure 6 As shown, one end of the slider segment 36 is a threaded part 31, and the other end of the slider segment 36 extends out of the slider 2 and is provided with a first connecting threaded section 361. The first connecting threaded section 361 has a strip-shaped connecting groove 362. The third gear 63 is sleeved on the gear segment 37, and the end of the gear segment 37 is provided with a second connecting threaded section 371. The second connecting threaded section 371 has a strip-shaped connecting protrusion 372. The slider segment 36 and the gear segment 37 are connected, the connecting protrusion 372 is located in the connecting groove 362, and the connecting nut 38 is threadedly fixed to both the first connecting threaded section 361 and the second connecting threaded section 371. The first power source is responsible for the rotation and core pulling of the rotating shaft 3. It has many parts and a complex structure, making subsequent maintenance and disassembly difficult, time-consuming, and labor-intensive. Therefore, the rotating shaft 3 in this application adopts a segmented structure, assembled by connecting nuts 38. Loosening the connecting nuts 38 separates the gear segment 37 from the slider segment 36, allowing the first power source to be completely removed from the moving mold 1. This modularization of the first power source facilitates overall disassembly and assembly, and improves maintenance. The snap-fit ​​between the strip-shaped connecting protrusion 372 and the connecting groove 362 prevents rotation between the slider segment 36 and the gear segment 37.

[0026] In the above technical solution: a protective cover 11 is fixed to the side of the moving mold 1, the gear transmission group 6 is located inside the protective cover 11, a first positioning guide sleeve 13 is provided on the protective cover 11, a fixing block 12 is fixed to the side of the protective cover 11, and a second positioning guide sleeve 14 is provided on the fixing block 12. The tail of the rotating shaft 3 passes through the first positioning guide sleeve 13, the third gear 63, and the second positioning guide sleeve 14 in sequence and cooperates with the adjusting block 33 and the rotating shaft nut 34.

[0027] In the above technical solution: the second power source includes an inclined guide post 8, which is inclinedly inserted into the slider 2, and the top of the inclined guide post 8 is connected and fixed to the fixed mold.

[0028] The working process of this invention is as follows: Before mold opening, the hydraulic cylinder 4 drives the rack 5 to move laterally. The lateral movement of the rack 5 drives the first gear 61 to rotate, while the second gear 62 rotates synchronously. The third gear 63 is driven to rotate, causing the rotating shaft 3 to start rotating. As the rotating shaft 3 rotates, it moves backward relative to the rotating shaft nut 34, the slider 2, and the moving mold 1, causing the thread forming part 31 to detach from the product, completing the thread core pulling. Then, the mold opens, the moving mold 1 separates from the fixed mold, and the slider 2 moves backward under the guidance of the inclined guide post 8 to pull the core, causing the slider forming part 21 to detach from the product, completing the lateral undercut core pulling. Since the front end of the rotating shaft 3 needs to be sealed with glue to the product surface to prevent flash, the thread core pulling is completed before mold opening. The core pulling process of this invention is stable and reliable, prevents damage to the product during core pulling, greatly reduces the scrap rate, and has a simple structure.

[0029] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should fall within the protection scope of the present invention.

Claims

1. A rotating lateral core-pulling mechanism, characterized in that... The device includes a first power source, a second power source, a slider located on a moving mold, and several rotating shafts. The ends of the rotating shafts pass through the sliders. One end of each rotating shaft has a thread-forming part for forming internal threads on the product, and the other end has a threaded mating part. The pitch of the threaded mating part is equal to the pitch of the thread-forming part. A rotating shaft nut is fitted onto the threaded mating part and is fixedly connected to the moving mold. The side of the slider has a slider forming part for forming an undercut on the product. The first power source drives the rotating shafts to rotate. Simultaneously, the rotating shafts move backward relative to the rotating shaft nut, the slider, and the moving mold, causing the thread-forming part to detach from the product. The second power source drives the slider to move backward to pull out a core, causing the slider forming part to detach from the product. The first power source is located outside the moving mold. The first power source includes a hydraulic cylinder, a rack, and a gear transmission assembly. The hydraulic cylinder is fixed to the side of the moving mold. The gear transmission assembly includes a first gear meshing with the rack, a second gear coaxially fixed with the first gear, and a third gear sleeved on the rotating shaft. The third gear meshes with the second gear. The diameter of the second gear is larger than the diameter of the first gear. The hydraulic cylinder is connected to the rack and drives the rack to move laterally. The lateral movement of the rack drives the first gear to rotate, and the second gear rotates synchronously. The third gear is driven to rotate and causes the rotating shaft to start rotating to pull the core. An adjusting block is fitted at the end of the rotating shaft, and a fixing block is provided on the side of the moving mold. The adjusting block is located between the fixing block and the rotating shaft nut and is fixed to the side of the fixing block. The rotating shaft nut is fixed to the adjusting block by two pressure blocks. The fixing block has several fixing grooves, and each fixing groove has a soft pad. Both ends of the adjusting block have fixing protrusions, which are located in the fixing grooves. A spacer screw passes through the fixing protrusion, and the end of the spacer screw passes through the soft pad and abuts against the bottom of the fixing groove, so that the two sides of the soft pad are in close contact with the bottom of the fixing groove and the end face of the fixing protrusion, respectively. The pitch of the spacer screw is smaller than the pitch of the threaded mating part. When the spacer screw is rotated, the adjusting block is displaced relative to the spacer screw, which in turn moves the pressure block, the rotating shaft nut, and the rotating shaft. The rotating shaft adopts a segmented structure, and a connecting nut is fitted on the rotating shaft. The rotating shaft includes a slider segment and a gear segment. One end of the slider segment is the threaded part, and the other end of the slider segment extends out of the slider and is provided with a first connecting thread segment. The end of the gear segment is provided with a second connecting thread segment. The connecting nut is threadedly fixed to both the first connecting thread segment and the second connecting thread segment.

2. The rotary lateral core-pulling mechanism according to claim 1, characterized in that... The moving mold is fixed with a guide rail fixing seat on its side. The guide rail fixing seat has a movable groove. Both sides of the movable groove are provided with protruding pressure plates. The pressure plates make the movable groove form an I-shaped slide groove. The end of the rack is fixed with a guide slider. The piston rod of the oil cylinder is fixed to the guide slider. The oil cylinder drives the rack to move laterally through the guide slider. The guide slider is slidably disposed in the I-shaped slide groove.

3. A rotating lateral core-pulling mechanism according to claim 2, characterized in that... Both ends of the I-shaped slide are provided with limit blocks. When the guide block contacts the limit block, the guide block and the rack stop moving. At the same time, two limit switches are provided on the side of the guide rail fixing seat. The guide block is provided with a moving limit strip. When the moving limit strip moves to contact the limit switch, the guide block and the rack stop moving.

4. A rotating lateral core-pulling mechanism according to claim 1, characterized in that... The pitch of the fixed-distance screw is 1mm, and the soft pad is made of polyurethane.

5. A rotating lateral core-pulling mechanism according to claim 1, characterized in that... The first connecting thread section has a strip-shaped connecting groove, and the second connecting thread section has a strip-shaped connecting protrusion, the connecting protrusion being located within the connecting groove.

6. A rotating lateral core-pulling mechanism according to claim 1, characterized in that... The second power source includes an inclined guide post, which is obliquely inserted into the slider, and the top of the inclined guide post is connected and fixed to the fixed mold.

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