Wheel hub bolt multi-station automatic cold header

Abstract

This invention relates to the field of cold heading machine technology, specifically to a multi-station automatic cold heading machine for wheel hub bolts, comprising a frame, a moving mold, a fixed mold, a base plate, a flipping assembly, an ejection assembly, a sliding support assembly, and a reset and avoidance unit. By driving a rack and pinion in conjunction with the moving mold, the base plate and fixed mold are flipped for material discharge. The ejection assembly ejects the workpiece, whose end is precisely positioned by a head locking seat on the sliding support assembly. Simultaneously, a clamping unit automatically clamps the workpiece body. Subsequently, driven by a synchronous linkage mechanism, the positioning plate drives the clamping unit to move the workpiece to the next station. This invention completes the entire process from material discharge to transfer with a single power source, achieving automatic locking and holding of the workpiece axis, fundamentally avoiding swaying and mold wear during the transfer process. It also boasts advantages such as compact structure, low cost, high reliability, and adaptability to multi-specification production.

Description

Technical Field

[0001] This invention relates to the field of cold heading machine technology, and in particular to a multi-station automatic cold heading machine for wheel hub bolts. Background Technology

[0002] Wheel hub bolts are critical safety components for automobiles, and their forming quality requirements are extremely high. They are typically produced in large quantities using a multi-station cold forging process for high efficiency and precision. In this process, the bolt blanks, after initial forging, are sequentially transferred and shaped between multiple station dies.

[0003] However, existing multi-station cold heading machines still have the following problems in production: 1. When the cold-headed bolts are ejected from a fixed mold and moved to the next station, the diameter of the bolt shank at each station has changed during processing, and its central axis is prone to uncontrollable displacement during the transfer process. If it is directly pushed into the fixed mold of the next station, the outer wall of the workpiece will scrape and collide with the mold entrance. 2. To achieve automated transfer, some high-end equipment uses independent, multi-degree-of-freedom servo-driven dedicated robotic arms for gripping and placing, which is costly. 3. Many transfer mechanisms require independent drive sources (such as cylinders and hydraulic cylinders) to complete a series of actions such as clamping, translation, loosening, and resetting. There are sequential waiting times between each action, which increases the cycle time and limits the further improvement of the overall production cycle. Therefore, a multi-station automatic cold heading machine for wheel hub bolts is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the background art by proposing a multi-station automatic cold heading machine for wheel hub bolts.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-station automatic cold heading machine for wheel hub bolts includes a frame, a moving die, and a fixed die. The moving die is fixedly connected to the frame. The machine also includes:

[0007] The bottom mounting base is fixedly connected to the frame;

[0008] The flipping assembly includes a rotating shaft, a base plate, and a drive module. The base plate is rotatably connected to the frame via the rotating shaft. Multiple fixed molds are spaced apart on the base plate along its axial direction. The drive module is linked with the moving mold to drive the base plate to rotate the fixed molds around the rotating shaft, so that the processed parts in the fixed molds can be discharged and the workstation can be switched.

[0009] An ejector assembly, mounted on a substrate, is used to eject the finished bolt workpiece from the corresponding fixed mold.

[0010] A sliding support assembly is slidably connected to the substrate. The sliding support assembly includes:

[0011] At least one slide block is slidably connected to the base plate;

[0012] The positioning plate is rotatably connected to the slide bar frame via the second rotating shaft. The positioning plate is provided with a head locking seat for abutting the end of the workpiece ejected from the fixed mold.

[0013] The clamping unit is movably connected to the substrate and includes a diagonal clamping plate that is slidably disposed perpendicular to the substrate. It is used to clamp the workpiece body when the ejection assembly ejects the workpiece and to automatically release it when the workpiece is reset.

[0014] The reset and avoidance unit is mounted on the second rotating shaft and is used to drive the positioning plate to rotate from the vertical state to the avoidance state when the base plate rotates to the horizontal state.

[0015] And a synchronous linkage mechanism, installed between the positioning plate and the clamping unit, so that the translational movement of the positioning plate along the substrate can synchronously drive the translational movement of the clamping unit.

[0016] Preferably, the drive module includes a gear fixedly connected to the rotating shaft and a drive rack meshing with the gear, and one end of the drive rack is fixedly connected to the moving mold through a connecting tool.

[0017] Preferably, the ejection assembly includes a limiting slide rail fixed to the substrate, a slide rod slidably connected to the limiting slide rail, a mounting rod fixed to the slide rod, and a fixed ejector rod provided for each fixed mold, one end of the fixed ejector rod being slidably extended into the fixed mold and the other end being fixed to the mounting rod.

[0018] Preferably, the clamping unit includes:

[0019] Two lateral slide rods, two connecting rods, and two multi-section connecting rods. The two ends of the two connecting rods are respectively fixed to the two slide rod frames, and the two ends of the two multi-section connecting rods are respectively fixed to the corresponding connecting rods and lateral slide rods.

[0020] Two clamping slides are slidably connected at their left and right ends to the upper and lower ends of two lateral slide bars, respectively.

[0021] Several diagonal clamping plates are slidably connected to the clamping slide plate;

[0022] And a clamping spring, installed between the diagonal clamping plates and the corresponding clamping slide.

[0023] Preferably, it also includes a guide assembly, which includes a clamping and limiting plate fixed to the substrate. The clamping and limiting plate has a guide groove. The end of the clamping slide plate slides in cooperation with the guide groove through multiple slide rods, so that the movement trajectory of the clamping slide plate and the diagonal clamping plate is constrained by the guide groove, so as to realize automatic clamping and releasing.

[0024] Preferably, the synchronous linkage mechanism includes a shift plate slidably connected to the positioning plate, a replacement plate detachably mounted on the shift plate, a linear driver for driving the shift plate, and a linkage assembly mounted between the shift plate and the clamping unit.

[0025] Preferably, the linear actuator is an electric telescopic rod, whose cylinder is fixedly connected to the positioning plate, whose telescopic end is fixedly connected to the shifting plate, and whose head locking seat is installed on the replacement plate, and whose number is one more than the number of fixed molds.

[0026] Preferably, the reset and avoidance unit includes:

[0027] A torsion spring, with its two ends acting on a positioning plate and a slide bar respectively, provides a torque toward the positioning plate to turn it into a vertical position;

[0028] The support block fixed to the slide bar frame and the pressure block fixed to the second rotating shaft restrict the positioning plate to a vertical state when the pressure block abuts against the support block under the action of the torsion spring.

[0029] A flipping block fixedly connected to the second rotating shaft;

[0030] The trigger rod, which is slidably connected to the slide bar frame, is pressed by the limit rod fixedly installed inside the frame when the base plate rotates to a horizontal position. The trigger rod is then driven by the flip block to rotate the second rotating shaft and the positioning plate to overcome the torque of the torsion spring and rotate to the tilting avoidance state.

[0031] Preferably, it also includes a sliding bracket reset component, including a slide rod, a spring sleeved on the slide rod, and a fixed baffle. One end of the slide rod is fixedly connected to the slide rod frame, the fixed baffle is connected to the base plate, and the two ends of the spring abut against the slide rod frame and the fixed baffle, respectively.

[0032] Preferably, the linkage assembly includes four short links and a rotating shaft three. Two short links form a group, and the middle of the two short links in each group crosses and is rotatably connected to the rotating shaft three. The upper ends of the two short links in each group are rotatably connected to the lateral slide rods, and the lower ends are rotatably connected to the shift plate. The rotating shaft three is also provided with a spring two, and the two ends of the spring two are fixedly connected to the rotating shaft three and the lateral slide rods, respectively.

[0033] Compared with existing technologies, the advantages of this invention are as follows:

[0034] This invention utilizes a head locking seat to lock the center of the workpiece end at the moment of ejection and maintains this axis throughout the translation process, enabling the workpiece to enter the next mold accurately without scratching. This solves the problems of eccentricity and mold wear caused by diameter changes, and significantly improves mold life and product quality.

[0035] By abandoning expensive independent robotic arms and electronic control systems, the reciprocating motion of the moving mold itself is cleverly used as the sole power source. Through mechanical structures such as gears, racks, and linkages, all subsequent actions such as flipping, ejecting, clamping, translation, and avoidance are triggered in a coordinated manner. This achieves a complex, fully automated process with extremely low hardware costs and extremely high reliability.

[0036] With a quick-change replacement plate and an adaptive, flexible clamping design, it can quickly adapt to the production of bolts of different specifications, shorten waiting time, and increase production cycle time. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of the mold in this invention;

[0039] Figure 3 This is a side view of the bottom fixing base structure of the present invention;

[0040] Figure 4 This is the present invention. Figure 3 Schematic diagram of the structure at point A in the middle;

[0041] Figure 5 This is a schematic diagram of the clamping spring structure of the present invention;

[0042] Figure 6 This is a schematic diagram of the structure of the positioning plate of the present invention;

[0043] Figure 7 This is a schematic diagram of the structure at the replacement plate location of the present invention;

[0044] Figure 8 This is the present invention. Figure 7 Schematic diagram of the structure at point B;

[0045] Figure 9 This is the present invention. Figure 7 Schematic diagram of the structure at point C.

[0046] In the diagram: 1. Frame; 2. Fixed ejector rod; 3. Mounting rod; 4. Limiting slide rail; 5. Slide rod one; 6. Spring one; 7. Fixed mold; 8. Drive rack; 9. Gear; 10. Clamping limiting plate; 11. Head locking seat; 12. Moving mold; 13. Connecting rod one; 14. Positioning plate; 15. Replacement plate; 16. Shifting plate; 17. Clamping slide plate; 18. Diagonal clamping plate; 19. Multi-section connecting rod; 20. Multi-section slide rail 21. Lateral slide bar; 22. Base plate; 23. Slide bar bracket; 24. Bottom fixing seat; 25. Fixing baffle; 26. Slide bar two; 27. Rotation shaft one; 28. Pressure block; 29. ​​Second rotation shaft; 30. Support block; 31. Flipping block; 32. Trigger rod; 33. Limiting rod; 34. Clamping spring; 35. Torsion spring; 36. Linear actuator; 37. Rotation shaft three; 38. Short connecting rod; 39. Spring two. Detailed Implementation

[0047] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0048] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] Reference Figures 1-9 A multi-station automatic cold heading machine for wheel hub bolts includes a frame 1, a moving die 12, and a fixed die 7. The moving die 12 is fixedly connected to the frame 1. The machine also includes:

[0050] The bottom mounting base 24 is fixedly connected to the frame 1;

[0051] The flipping assembly includes a rotating shaft 27, a base plate 22, and a drive module. The base plate 22 is rotatably connected to the frame 1 via the rotating shaft 27. Multiple fixed molds 7 are spaced apart on the base plate 22 along its axial direction. The drive module is linked with the moving mold 12 to drive the base plate 22 to rotate the fixed molds 7 around the rotating shaft 27, so that the processed parts in the fixed molds 7 can be unloaded and the workstation can be switched.

[0052] The drive module includes a gear 9 fixedly connected to the rotating shaft 27 and a drive rack 8 meshing with the gear 9. One end of the drive rack 8 is fixedly connected to the moving mold 12 via a connecting tool.

[0053] In this embodiment, one end of the drive rack 8 is connected to the moving mold 12 via a connecting tool, and the replacement plate 15 on the shift plate 16 can be replaced according to the size and shape of the bolt processing.

[0054] When the moving mold 12 finishes cold forging the bolt inside the fixed mold 7 and moves away from the fixed mold 7, a moving ejector rod is provided inside the moving mold 12 to prevent the bolt processing part from getting stuck. When the moving mold 12 is a certain distance from the fixed mold 7 (greater than the radius required for the subsequent bolt to extend out of the entire base plate 22 and rotate along the rotating axis 27), the drive rack 8 connected to the moving mold 12 will mesh with the gear 9.

[0055] The rotating shaft 27 and the base plate 22 are driven to rotate, and all the components on the base plate 22 will rotate together. The drive rack 8 drives the gear 9, the rotating shaft 27 and the base plate 22 to rotate together.

[0056] The sliding support assembly is slidably connected to the base plate 22, and the sliding support assembly includes:

[0057] At least one slide rod 23 is slidably connected to the base plate 22;

[0058] The positioning plate 14 is rotatably connected to the slide bar frame 23 via the second rotating shaft 29. The positioning plate 14 is provided with a head locking seat 11 for abutting the end of the workpiece ejected from the fixed mold 7.

[0059] The reset and avoidance unit is mounted on the second rotating shaft 29 and is used to drive the positioning plate 14 from the vertical state to the avoidance state when the base plate 22 rotates to the horizontal state.

[0060] The reset avoidance unit includes:

[0061] The torsion spring 35 has two ends acting on the positioning plate 14 and the slide bar 23 respectively, providing torque toward the positioning plate 14 to make it turn into a vertical state;

[0062] The support block 30, which is fixed to the slide bar frame 23, and the pressure block 28, which is fixed to the second rotating shaft 29, restrict the positioning plate 14 to be in a vertical state when the pressure block 28 abuts against the support block 30 under the action of the torsion spring 35.

[0063] The flipping block 31 is fixedly connected to the second rotating shaft 29;

[0064] The trigger rod 32, which is slidably connected to the slide rod frame 23, is pressed by the limiting rod 33 fixedly installed inside the frame 1 when the base plate 22 rotates to a horizontal position. The trigger rod 32 is then driven by the flip block 31 to drive the second rotating shaft 29 and the positioning plate 14 to overcome the torque of the torsion spring 35 and rotate to the tilting avoidance state.

[0065] In this embodiment, the flipping block 31 on the substrate 22 springs up the trigger rod 32 under the action of the torsion spring 35, thereby driving the second rotating shaft 29 to rotate the positioning plate 14 until the pressure block 28 is in close contact with the support block 30. At this time, the replacement plate 15 and the head locking seat 11 on the positioning plate 14 turn into a vertical state.

[0066] The ejection assembly, disposed on the base plate 22, is used to eject the processed bolt workpiece from the corresponding fixed mold 7.

[0067] The clamping unit is movably connected to the substrate 22 and includes a diagonal clamping plate 18 that is slidably disposed perpendicular to the substrate 22. It is used to clamp the workpiece body when the ejection assembly ejects the workpiece and automatically release it when the workpiece is reset.

[0068] The ejection assembly includes a limiting slide rail 4 fixedly connected to the substrate 22, a slide rod 26 slidably connected to the limiting slide rail 4, a mounting rod 3 fixedly connected to the slide rod 26, and a fixed ejector rod 2 provided for each fixed mold 7. One end of the fixed ejector rod 2 can slide into the fixed mold 7 and the other end is fixedly connected to the mounting rod 3.

[0069] The clamping unit includes:

[0070] Two lateral slide rods 21, two connecting rods 13 and two multi-section connecting rods 19, the two ends of the two connecting rods 13 are respectively fixed to the two slide rod frames 23, and the two ends of the two multi-section connecting rods 19 are respectively fixed to the corresponding connecting rods 13 and lateral slide rods 21.

[0071] Two clamping slides 17 are slidably connected at their left and right ends to the upper and lower ends of two lateral slide rods 21, respectively.

[0072] Several diagonal clamping plates 18 are slidably connected to the clamping slide plate 17;

[0073] And a clamping spring 34, which is installed between the diagonal clamping plate 18 and the corresponding clamping slide plate 17.

[0074] It also includes a guide assembly, which includes a clamping and limiting plate 10 fixedly connected to the base plate 22. The clamping and limiting plate 10 has a guide groove. The end of the clamping slide plate 17 slides in cooperation with the guide groove through multiple slide rods 20, so that the movement trajectory of the clamping slide plate 17 and the diagonal clamping plate 18 is constrained by the guide groove, so as to realize automatic clamping and releasing.

[0075] In this embodiment, the slide bar 26 then moves along the groove in the limiting slide rail 4, pushes the fixed ejector rod 2 through the mounting rod 3, and ejects the cold-forged part in the fixed mold 7. The end of the workpiece is tightly attached to the head locking seat 11 to keep the center of the workpiece locked. The workpiece and the fixed ejector rod 2 push the head locking seat 11 and the positioning plate 14 to move. Then, through the second rotating shaft 29, the slide bar frame 23, the connecting rod 13, and the lateral slide bar 21, the clamping slide plate 17 and its diagonal clamping plate 18 move synchronously. The multi-section slide bar 20 moves in the groove of the clamping limiting plate 10, so that the diagonal clamping plate 18 can clamp the workpiece as it moves away from the fixed mold 7. The designed clamping spring 34 and the displacement of the diagonal clamping plate 18 in the clamping slide plate 17 are to adapt to the change in diameter of the bolt workpiece at different work positions.

[0076] Among them, the linear actuator 36 is an electric telescopic rod, whose cylinder body is fixedly connected to the positioning plate 14, its telescopic end is fixedly connected to the shift plate 16, and the head locking seat 11 is installed on the replacement plate 15, and its number is one more than the number of fixed molds 7.

[0077] And a synchronous linkage mechanism is installed between the positioning plate 14 and the clamping unit, so that the translational movement of the positioning plate 14 along the base plate 22 can synchronously drive the clamping unit to translate.

[0078] The synchronous linkage mechanism includes a shift plate 16 slidably connected to the positioning plate 14, a replacement plate 15 detachably mounted on the shift plate 16, a linear driver 36 for driving the shift plate 16, and a linkage assembly mounted between the shift plate 16 and the clamping unit.

[0079] The linkage assembly includes four short links 38 and a rotating shaft 37. Two short links 38 form a group. In each group, the two short links 38 cross each other in the middle and are rotatably connected to the rotating shaft 37. The upper ends of the two short links 38 in each group are rotatably connected to the lateral slide rod 21, and the lower ends are rotatably connected to the shift plate 16. The rotating shaft 37 is also provided with a second spring 39. The two ends of the second spring 39 are fixedly connected to the rotating shaft 37 and the lateral slide rod 21, respectively.

[0080] In this embodiment, after the workpiece is completely removed from the fixed mold 7, the bottom of the base plate 22 is in close contact with the inclined surface of the bottom fixing seat 24. At this time, the sensor provided at the inclined surface of the fixing seat 24 senses the contact of the base plate 22 and sends a signal to control the linear driver 36 to extend, pushing the shift plate 16 and the head locking seat 11 to move horizontally to the next station. The head locking seat 11 drives the lateral slide bar 21 and its diagonal clamping plate 18 to move synchronously through the short connecting rod 38 and the rotating shaft 37, realizing the overall station transfer of the workpiece.

[0081] It also includes a sliding bracket reset component, which includes a slide rod 5, a spring 6 sleeved on the slide rod 5, and a fixed baffle 25. One end of the slide rod 5 is fixedly connected to the slide rod frame 23, the fixed baffle 25 is connected to the base plate 22, and the two ends of the spring 6 abut against the slide rod frame 23 and the fixed baffle 25 respectively.

[0082] In this embodiment, the moving mold 12 approaches the fixed mold 7 again, and the driving rack 8 causes the base plate 22 to reverse and reset via the gear 9, restoring the fixed mold 7 to a horizontal position. The fixed ejector rod 2 retracts along the limiting slide rail 4 via the second slide rod 26, and the slide rod frame 23 moves towards the fixed mold 7 under the spring force of the first slide rod 5. The trigger rod 32 is again pressed against the limiting rod 33, causing the second rotating shaft 29 to drive the positioning plate 14 to rotate to avoid the moving mold 12. At this time, the diagonal clamping plate 18 still holds the workpiece. When the moving mold 12 brings the workpiece closer to the fixed mold 7, the head of the workpiece first enters the entrance of the fixed mold 7. At this time, the diagonal clamping plate 18 remains clamped under the action of the clamping spring 34 to prevent initial eccentricity. As the moving mold 12 continues to move forward, the rod part of the workpiece gradually penetrates into the inner cavity of the fixed mold 7. Meanwhile, because the multi-section sliding rods 20 on the clamping slide plate 17 are constrained by the guide grooves of a specific shape on the clamping limiting plate 10, the diagonal clamping plates 18 begin to open. At this time, the workpiece has already entered a considerable length inside the fixed mold 7, and its radial position has been reliably constrained by the inner wall of the fixed mold 7. The two sets of diagonal clamping plates 18 will open relative to each other along the sliding grooves of the clamping limiting plate 10, releasing the workpiece. At this time, the sensor controls the linear actuator 36 to retract and return to its original position.

[0083] Working principle: One end of the drive rack 8 is connected to the moving mold 12 through a connecting tool. The replacement plate 15 on the shift plate 16 can be replaced according to the size and shape of the bolt.

[0084] When the moving mold 12 finishes cold forging the bolt inside the fixed mold 7 and moves away from the fixed mold 7, a moving ejector rod is provided inside the moving mold 12 to prevent the bolt processing part from getting stuck. When the moving mold 12 is a certain distance from the fixed mold 7 (greater than the radius required for the subsequent bolt to extend out of the entire base plate 22 and rotate along the rotating axis 27), the drive rack 8 connected to the moving mold 12 will mesh with the gear 9.

[0085] The rotating shaft 27 and the base plate 22 are driven to rotate, and all the components on the base plate 22 will rotate together. The drive rack 8 drives the gear 9, the rotating shaft 27 and the base plate 22 to rotate together. The flipping block 31 on the base plate 22 bounces up the trigger rod 32 under the action of the torsion spring 35, which in turn drives the second rotating shaft 29 to drive the positioning plate 14 to rotate until the pressure block 28 is in close contact with the support block 30. At this time, the replacement plate 15 and the head locking seat 11 on the positioning plate 14 turn to the vertical state.

[0086] Subsequently, slide bar 26 moves along the groove in the limiting slide rail 4, pushes the fixed ejector rod 2 through the mounting rod 3, and ejects the cold-forged part in the fixed mold 7. The end of the workpiece is tightly attached to the head locking seat 11 to keep the center of the workpiece locked. The workpiece and the fixed ejector rod 2 push the head locking seat 11 and the positioning plate 14 to move. Then, through the second rotating shaft 29, slide bar frame 23, connecting rod 13, and lateral slide bar 21, the clamping slide plate 17 and its diagonal clamping plate 18 move synchronously. The multi-section slide bar 20 moves in the groove of the clamping limiting plate 10, so that the diagonal clamping plate 18 can clamp the workpiece as it moves away from the fixed mold 7. The designed clamping spring 34 and the displacement of the diagonal clamping plate 18 in the clamping slide plate 17 are to adapt to the change in diameter of the bolt workpiece at different work positions.

[0087] After the workpiece is completely removed from the fixed mold 7, the bottom of the base plate 22 is pressed against the inclined surface of the bottom fixed seat 24. At this time, the sensor provided on the inclined surface of the fixed seat 24 senses the tightness of the base plate 22 and sends a signal to control the linear driver 36 to extend, pushing the shift plate 16 and the head locking seat 11 to move horizontally to the next station. The head locking seat 11 drives the lateral slide bar 21 and its diagonal clamping plate 18 to move synchronously through the short connecting rod 38 and the rotating shaft 37, realizing the overall station transfer of the workpiece.

[0088] The moving mold 12 approaches the fixed mold 7 again, and the driving rack 8, through the gear 9, causes the base plate 22 to reverse and reset, restoring the fixed mold 7 to a horizontal position. The fixed ejector rod 2 retracts along the limiting slide rail 4 via the second slide rod 26, and the slide rod bracket 23 moves towards the fixed mold 7 under the spring force of the first slide rod 5. The trigger rod 32 is once again pressed against the limiting rod 33, causing the second rotating shaft 29 to drive the positioning plate 14 to rotate to avoid the moving mold 12. At this time, the diagonal clamping plate 18 still holds the workpiece. When the moving mold 12 brings the workpiece closer to the fixed mold 7, the head of the workpiece first enters the entrance of the fixed mold 7. At this time, the diagonal clamping plate 18 remains clamped under the action of the clamping spring 34 to prevent initial eccentricity. As the moving mold 12 continues to move forward, the rod part of the workpiece gradually penetrates into the inner cavity of the fixed mold 7. Meanwhile, because the multi-section sliding rods 20 on the clamping slide plate 17 are constrained by the guide grooves of a specific shape on the clamping limiting plate 10, the diagonal clamping plates 18 begin to open. At this time, the workpiece has already entered a considerable length inside the fixed mold 7, and its radial position has been reliably constrained by the inner wall of the fixed mold 7. The two sets of diagonal clamping plates 18 will open relative to each other along the sliding grooves of the clamping limiting plate 10, releasing the workpiece. At this time, the sensor controls the linear actuator 36 to retract and return to its original position.

[0089] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0090] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-station automatic cold heading machine for wheel hub bolts, comprising a frame (1), a moving mold (12), and a fixed mold (7), wherein the moving mold (12) is fixedly connected to the frame (1), characterized in that, Also includes: The bottom mounting base (24) is fixedly connected to the frame (1); The flipping assembly includes a rotating shaft (27), a base plate (22), and a drive module. The base plate (22) is rotatably connected to the frame (1) via the rotating shaft (27). Multiple fixed molds (7) are installed on the base plate (22) at intervals along the axial direction of the base plate (22). The drive module is linked with the moving mold (12) to drive the base plate (22) to drive the fixed molds (7) to rotate around the rotating shaft (27), so that the processed parts in the fixed molds (7) can be discharged and the workstation can be switched. An ejector assembly is disposed on a substrate (22) for ejecting the processed bolt workpiece from the corresponding fixed mold (7); A sliding support assembly is slidably connected to the base plate (22). The sliding support assembly includes: At least one slide bar (23) is slidably connected to the base plate (22); The positioning plate (14) is rotatably connected to the slide frame (23) via the second rotating shaft (29). The positioning plate (14) is provided with a head locking seat (11) for abutting the end of the workpiece ejected from the fixed mold (7). The clamping unit is movably connected to the substrate (22) and includes a diagonal clamp (18) that is slidably disposed in the direction perpendicular to the substrate (22) for clamping the workpiece body when the ejection assembly ejects the workpiece and automatically releasing it when the workpiece is reset. The reset and avoidance unit is installed on the second rotating shaft (29) and is used to drive the positioning plate (14) to rotate from the vertical state to the avoidance state when the base plate (22) rotates to the horizontal state; And a synchronous linkage mechanism is installed between the positioning plate (14) and the clamping unit, so that the translational movement of the positioning plate (14) along the base plate (22) can synchronously drive the clamping unit to translate.

2. The multi-station automatic cold heading machine for wheel hub bolts according to claim 1, characterized in that: The drive module includes a gear (9) fixedly connected to the rotating shaft (27) and a drive rack (8) meshing with the gear (9). One end of the drive rack (8) is fixedly connected to the moving mold (12) through a connecting tool.

3. The multi-station automatic cold heading machine for wheel hub bolts according to claim 1, characterized in that: The ejection assembly includes a limiting slide rail (4) fixed to the substrate (22), a slide rod (26) slidably connected to the limiting slide rail (4), an mounting rod (3) fixed to the slide rod (26), and a fixed ejector rod (2) provided for each fixed mold (7). One end of the fixed ejector rod (2) can slide into the fixed mold (7) and the other end is fixed to the mounting rod (3).

4. The multi-station automatic cold heading machine for wheel hub bolts according to claim 1, characterized in that: The clamping unit includes: Two lateral slide rods (21), two connecting rods (13) and two multi-section connecting rods (19), the two ends of the two connecting rods (13) are respectively fixed to the two slide rod frames (23), and the two ends of the two multi-section connecting rods (19) are respectively fixed to the corresponding connecting rods (13) and lateral slide rods (21); Two clamping slides (17) are slidably connected at their left and right ends to the upper and lower ends of two lateral slide bars (21); Several diagonal clamps (18) are slidably connected to the clamping slide plate (17); And a clamping spring (34) is installed between the diagonal clamping plate (18) and the corresponding clamping slide plate (17).

5. The multi-station automatic cold heading machine for wheel hub bolts according to claim 4, characterized in that: It also includes a guide assembly, which includes a clamping limiting plate (10) fixed to the substrate (22). The clamping limiting plate (10) has a guide groove. The end of the clamping slide plate (17) slides with the guide groove through a multi-section slide rod (20), so that the movement trajectory of the clamping slide plate (17) and the diagonal clamping plate (18) is constrained by the guide groove, so as to realize automatic clamping and loosening.

6. The multi-station automatic cold heading machine for wheel hub bolts according to claim 1, characterized in that: The synchronous linkage mechanism includes a shift plate (16) slidably connected to the positioning plate (14), a replacement plate (15) detachably mounted on the shift plate (16), a linear driver (36) for driving the shift plate (16), and a linkage assembly mounted between the shift plate (16) and the clamping unit.

7. The multi-station automatic cold heading machine for wheel hub bolts according to claim 6, characterized in that: The linear actuator (36) is an electric telescopic rod, whose cylinder is fixedly connected to the positioning plate (14), whose telescopic end is fixedly connected to the shift plate (16), and whose head locking seat (11) is installed on the replacement plate (15), and whose number is one more than the number of fixed molds (7).

8. The multi-station automatic cold heading machine for wheel hub bolts according to claim 1, characterized in that: The reset avoidance unit includes: A torsion spring (35) with its two ends acting on the positioning plate (14) and the slide bar (23) respectively, provides torque toward the positioning plate (14) to turn it into a vertical position; The support block (30) fixed to the slide frame (23) and the pressure block (28) fixed to the second rotating shaft (29) restrict the positioning plate (14) to be in a vertical state when the pressure block (28) abuts against the support block (30) under the action of the torsion spring (35); A flipping block (31) is fixedly connected to the second rotating shaft (29); The trigger rod (32) which is slidably connected to the slide rod frame (23) is pressed by the limiting rod (33) fixedly installed inside the frame (1) when the base plate (22) is rotated to the horizontal. The second rotating shaft (29) and the positioning plate (14) are driven by the flip block (31) to overcome the torque of the torsion spring (35) and rotate to the tilting avoidance state.

9. The multi-station automatic cold heading machine for wheel hub bolts according to claim 1, characterized in that: It also includes a sliding bracket reset component, including a slide rod (5), a spring (6) sleeved on the slide rod (5) and a fixed baffle (25). One end of the slide rod (5) is fixedly connected to the slide rod frame (23), the fixed baffle (25) is connected to the base plate (22), and the two ends of the spring (6) abut against the slide rod frame (23) and the fixed baffle (25) respectively.

10. A multi-station automatic cold heading machine for wheel hub bolts according to claim 6, characterized in that: The linkage assembly includes four short links (38) and a rotating shaft three (37). Two short links (38) form a group. The middle parts of the two short links (38) in each group cross and are rotatably connected to the rotating shaft three (37). The upper ends of the two short links (38) in each group are rotatably connected to the lateral slide rod (21) and the lower ends are rotatably connected to the shift plate (16). The rotating shaft three (37) is also provided with a spring two (39). The two ends of the spring two (39) are fixedly connected to the rotating shaft three (37) and the lateral slide rod (21) respectively.

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