A four-station assembly line for ball head pre-riveting

Abstract

The application relates to a four-station assembling flow line for ball head pre-riveting, which comprises a base, a ball head positioning transmission mechanism horizontally arranged on the base, a ball pin conveying assembly with a conveying mechanical hand, a sealing cover conveying assembly with a sealing cover suction disc and a riveting assembly with a riveting disc fixedly connected around the center point of the ball seat positioning transmission mechanism on the base; the ball head positioning mechanism comprises a rotating disc, four positioning guide rails, four positioning support seats and four ball seat positioning seats; the positioning guide rails are detachably fixedly connected to the top surfaces of the rotating disc located between two adjacent ball seat positioning seats; the positioning support seats are slidably connected to the positioning guide rails and can be locked with the positioning guide rails at one end, can be used for installing the ball seat assembly, can be suitable for installing the same ball seat in batch production, can reduce the situation that a large number of ball head assembly defective products are produced due to inaccurate positions, can accurately control the installation positions of various components of the ball head assembly during installation, and thus the installation quality of the ball head assembly is improved.

Description

Technical Field

[0001] This invention relates to the technical field of ball joint assembly line, and in particular to a four-station assembly line for ball joint pre-assembly and riveting. Background Technology

[0002] The ball joint assembly, also known as a ball joint thrust rod, is widely used in rear axle suspensions and air suspensions. Its main function is to maintain the relative position between the axle and the vehicle frame, and to transmit longitudinal and lateral forces, as well as torque. Connecting one end of the thrust rod to the axle and the other end to the frame reduces vibration and impact caused by uneven road surfaces, greatly ensuring passenger comfort and the integrity of transported goods. The ball joint thrust rod is primarily assembled using riveting technology. This riveting method utilizes a ball pin conveyor, a sealing cap placement device, and a riveting device. The ball pin conveyor transports the ball pin to the ball seat, the sealing cap placement device places the sealing cap on the ball seat, sealing the ball head in place, and then the riveting device rivets the ball seat, thus assembling the ball joint assembly. However, during the riveting process, riveting fixtures are required to fix the ball seat in the ball joint. Existing riveting fixtures are as follows: For example, patent application CN201510743366.2 discloses a type I automotive thrust rod integral riveting fixture and its riveting method. The fixture includes an upper mounting plate, a lower mounting plate, a floating plate, and upper and lower riveting dies respectively disposed on the upper and lower mounting plates. Two upper and two lower riveting dies are provided. The fixture also includes two ball-head slides slidably connected to the floating plate and two equal-height blocks disposed on the floating plate. Two slide power cylinders are also fixedly connected to the floating plate. Driven by the two slide power cylinders, the two ball-head slides can move relatively closer or relatively farther away along the floating plate. Two ball-head slides can drive two ball heads to be respectively fitted onto the two ends of the tube body; a vertical power cylinder is also provided on the floating plate. The lower riveting die passes through the floating plate. Under the action of the vertical power cylinder, the floating plate can move back and forth vertically. Both the slide power cylinder and the vertical power cylinder are hydraulic cylinders or pneumatic cylinders. This invention ensures the quality of the thrust rod body and can complete the overall riveting in one go. However, the structure is relatively complex and requires a high investment. Four power cylinders are needed to drive it for positioning, and the maintenance cost is high. The power cylinders need to be maintained regularly, especially the power cylinder for ball head positioning.

[0003] For example, patent publication number CN204247845U discloses a thrust rod riveting fixture, including a lower connecting plate, a rear positioning plate and a front positioning plate disposed on the lower connecting plate, a connecting pipe support, a lower left support seat, a lower right support seat and a pressure plate on the lower connecting plate, and an upper connecting plate. Two riveting upper dies are symmetrically disposed at the bottom of the upper connecting plate, and the two riveting upper dies are symmetrically disposed between the left and right lower support seats. A left riveting die and a right riveting die are disposed between the two riveting upper dies, and the left riveting die and the right riveting die are symmetrical. The components are arranged on both sides of the line connecting the left and right lower support seats. The left riveting die is connected to the middle of the left lower support seat through the left tie rod, and the right riveting die is connected to the middle of the right lower support seat through the right tie rod. The structure of this invention is simple and easy to operate. It can effectively improve the riveting accuracy and stability of the thrust rod, effectively improve the riveting efficiency of the thrust rod, and save manpower to a certain extent. It has good applicability and strong practicality. However, the rising structure has poor adaptability to the size of the thrust rod and cannot clamp and position thrust rods of different lengths. For example, patent publication number CN209021086U discloses a thrust rod hot riveting device, including a heating device and a pressurizing device. The heating device includes a conveyor frame, a conveyor platform, a conveyor bar, a limiting baffle, and a conveying component. The conveying component includes a bracket assembly locked on the limiting baffle and a conveying plate set on the bracket assembly. The conveying plate is located above the conveyor bar. The pressurizing device includes a pressurizing frame, a hydraulic press, a pressurizing platform, and a riveting assembly. The riveting assembly includes a pressurizing seat set on the pressurizing frame via a column, an upper template set on the pressurizing seat, an upper riveting seat set on the upper template, a lower template set on the pressurizing platform, and a lower riveting seat set on the lower template. The hydraulic press is set above the pressurizing frame via a column, and the output piston rod of the hydraulic press is connected to the pressurizing seat. The column passes through the pressurizing seat, and the pressurizing seat can move up and down along the column. This invention can save the space occupied by the plane and improve the pressurizing riveting effect. However, the riveting of the thrust rod is carried out from the heating and positioning process, and the equipment process is more complicated. It has a large difference from this invention in terms of structure and process. In summary, this invention proposes a four-station assembly line for pre-riveting ball heads. This ensures that the holes inside the ball head are precisely aligned with the ball pin conveying device, sealing cap placement device, and riveting device, guaranteeing that the center hole of each ball seat is always in the same position. This ensures that the ball head conveying device, sealing cap placement device, and riveting device are always installed in the same position as the ball seat. This method is suitable for mass production of the same type of ball seat, reducing the number of defective ball head assemblies caused by inaccurate positioning. It precisely controls the installation position of each component during ball head assembly installation, thereby indirectly improving the installation quality of the ball head assembly and reducing inconsistencies in quality accuracy caused by the relative positions of different components. Furthermore, it is applicable to the positioning of connecting rods on ball seats of different lengths. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art and to propose a four-station assembly line for pre-riveting ball heads, which can install ball seat assemblies.

[0005] To achieve the above objectives, this invention proposes a four-station assembly line for pre-riveting ball heads, including a base. A ball head positioning and transmission mechanism is horizontally arranged on the base. A ball pin conveying assembly with a conveying robot arm, a sealing cover conveying assembly with a sealing cover suction cup, and a riveting assembly with a riveting disc are fixedly connected to the base around the ball head positioning and transmission mechanism. The ball head positioning and transmission mechanism includes a turntable, four positioning guide rails, four positioning support seats, and four ball seat positioning seats; The turntable is driven to rotate and is connected to the base; The four ball seat positioning seats are all detachably and fixedly connected to the turntable. The four ball seat positioning seats can be rotated to be arranged opposite to the conveying robot, the sealing cover suction cup and the riveting plate, respectively. The positioning guide rails are all detachably and fixedly connected to the top surface of the turntable located at the top surface of the two adjacent ball seat positioning seats; The positioning support is slidably connected to the positioning guide rail, and one end can be locked with the positioning guide rail; The ball pin conveying assembly includes a connecting frame 1, a cylinder 1, a cylinder 2, a lifting plate 1, and a ball pin clamping component, all fixedly connected to the base. The connecting frame 1 is fixedly connected to the base, the cylinder 1 is fixedly connected to the connecting frame 1, the cylinder 2 is slidably connected to the connecting frame 1, and the output shaft of the cylinder 1 is fixedly connected to the cylinder 2. The lifting plate 1 is vertically connected to the connecting frame 1, and the output shaft of the cylinder 2 is fixedly connected to the lifting plate 1. The conveying robot is fixedly connected to the bottom surface of the lifting plate 1. A ball pin positioning seat is fixedly connected to the base, and the ball pin positioning seat can be arranged opposite to the conveying robot. The ball pin clamping component includes a clamping column, a support plate, a third cylinder, and a second connecting frame. The support plate is detachably and fixedly connected to the second connecting frame, and a positioning hole is provided on the support plate. The positioning hole is positioned opposite to the center of the ball seat positioning seat. The clamping column is vertically connected to the second connecting frame, and the third cylinder is fixedly connected to the second connecting frame. The output shaft of the third cylinder is fixedly connected to the clamping column. The diameter of the clamping column is smaller than the diameter of the positioning hole.

[0006] Furthermore, a sealing cover positioning seat corresponding to the ball seat positioning seat is fixedly connected to the turntable. The sealing cover conveying assembly includes a connecting frame three, a cylinder four, and a cylinder five. The connecting frame three is fixedly connected to the base, the cylinder four is fixedly connected to the connecting frame three, the cylinder five is slidably connected to the connecting frame three, the output shaft of the cylinder four is fixedly connected to the cylinder five, the sealing cover suction cup is lifted and lowered connected to the connecting frame three, and the output shaft of the cylinder five is fixedly connected to the sealing cover suction cup.

[0007] Furthermore, the riveting assembly includes a connecting frame four, a lifting seat, and a rotating column. The connecting frame four is fixedly connected to the base. The lifting seat is driven to move up and down and is connected to the connecting frame four. The rotating column is driven to rotate and is connected to the bottom surface of the lifting seat. The rotating column can be arranged opposite to the ball seat. The riveting disc is fixedly connected to the end of the rotating column near the ball seat.

[0008] Furthermore, a limiting baffle is fixedly connected to the connecting frame three, and a storage box with a top slot is fixedly connected to the limiting baffle.

[0009] Furthermore, a limiting post is fixedly connected to the top of the support plate, and a limiting plate is fixedly connected to the pressing post. One end of the limiting plate is slidably connected to the limiting post, and a limiting bolt is threadedly connected to the limiting post.

[0010] Furthermore, the sealing cover positioning seat includes a disassembly seat and a positioning block. The disassembly seat is detachably connected to the base, and the positioning seat is threadedly connected to the disassembly seat. The top of the positioning block has a slot for the sealing cover to enter.

[0011] Furthermore, the ball seat positioning seat has a first connecting hole on its top surface, a second connecting hole on the first connecting hole, and a pull rod groove communicating with the first connecting hole on the ball seat positioning seat.

[0012] The beneficial effects of the present invention: Compared with the prior art, the present invention has the following effects, The ball joint is positioned by four ball joint positioning seats, ensuring that it remains at a single, immovable point. The rotation of the turntable then allows the ball joint to be transferred to the conveying robot, sealing cap suction cup, and riveting plate for installation. By maintaining the ball joint's fixed position, it is ensured that the ball joint remains centered throughout the installation process. This also ensures that the conveying robot, sealing cap suction cup, and riveting plate are all installed in the same position. This method is suitable for mass production of the same type of ball joint, reducing the number of defective ball joint assemblies caused by inaccurate positioning. It allows for precise control of the installation position of each component during the ball joint assembly installation, thereby improving the overall installation quality. This invention supports ball seats of different lengths by using a positioning support seat, which can increase the support effect of the connecting rod. It is also applicable to the production of ball seats of different lengths. The detachable ball seat positioning seat can be easily replaced by personnel to make it suitable for the size of the ball seat support, thereby increasing the positioning effect of the ball seat.

[0013] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram showing the positions of pulley one and pulley two of the present invention; Figure 3 This is a schematic diagram showing the position of the limiting bolt of the present invention; Figure 4 This is a schematic diagram showing the position of the ball pin positioning seat of the present invention; Figure 5 This is a schematic diagram showing the position of the disassembly base of the present invention.

[0015] In the diagram: 1. Base; 2. Ball head positioning and transmission mechanism; 3. Conveying robot; 4. Ball pin conveying assembly; 5. Sealing cover suction cup; 6. Sealing cover conveying assembly; 7. Riveting disc; 8. Riveting assembly; 9. Turntable; 11. Positioning guide rail; 12. Positioning support seat; 13. Ball seat positioning seat; 14. Connecting frame one; 15. Cylinder one; 16. Cylinder two; 17. Lifting plate one; 18. Ball pin clamping component; 19. Clamping column; 20. Support plate; 21. Cylinder three; 22. Connecting frame two; 23. Positioning hole; 24. Sealing cover positioning seat; 25. Connecting frame three; 26. Cylinder four; 27. Cylinder five; 28. Connecting frame four; 29. ​​Lifting seat; 30. Rotating column; 31. Limiting baffle; 32. Storage box; 33. Limiting column; 34. Limiting plate; 35. Limiting bolt; 36. Disassembly seat; 37. Positioning block; 38. Slot; 39. Connecting hole one; 40. Connecting hole two; 41. Tie rod slot; 42. Ball pin positioning seat; 43. Motor one; 44. Bolt one; 45. Bolt two; 46. Cylinder six; 47. Motor two; 48. Belt pulley one; 49. Belt pulley two. Detailed Implementation

[0016] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0017] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0018] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "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 application 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 application.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] Please see Figures 1 to 5 A four-station assembly line for pre-riveting ball heads includes a base 1. The ball head positioning and transmission mechanism 2 is driven to rotate and is mounted on the ball head positioning and transmission mechanism 2; The ball pin conveying assembly 4 with a conveying robot arm 3, the sealing cap conveying assembly 6 with a sealing cap suction cup 5, and the riveting assembly 8 with a riveting disc 7 are all fixedly connected to the base 1 around the ball head positioning and transmission mechanism 2. The ball head positioning and transmission mechanism 2 can drive the ball seat to move to a position opposite to the conveying robot arm 3, the sealing cap suction cup 5, and the riveting disc 7. The conveying robot arm 3 is existing technology, and its model is L000082, a cylinder-operated gripper. The sealing cap suction cup 5 is also existing technology, and its model is QLF-VTM350, a suction cup robot arm. The ball-head positioning and transmission mechanism 2 of this invention includes a turntable 9, four positioning guide rails 11, four positioning support seats 12, and four ball seat positioning seats 13. The turntable 9 is driven by a motor 43 to rotate horizontally and is connected to a base 1. The motor 43 is fixedly connected inside the base 1, and its output shaft is fixedly connected to the turntable 9, thus enabling the turntable 9 to rotate. During operation, the ball seat is simply placed on the ball seat positioning seat 13, which is slidably connected to the turntable 9. The ball seat positioning seat 13 supports the ball seat, and the operator slides the other end of the ball seat onto the positioning support seat 12 on the positioning guide rail, using the positioning support seat 12 to position the ball seat. The positioning support 12 can slide on the positioning guide rail 11, which is detachably and fixedly connected to the base 1. It is mainly used to support ball seat rods of different lengths. When the positioning guide rail and the positioning support 12 are actually locked, they are locked by bolt 44. Bolt 44 is threadedly connected to the positioning support 12 and is turned into contact with the positioning guide rail 11 to lock the positioning support 12. The positioning guide rail 11 is detachably connected to the base 1 by bolt 45. Bolt 45 is rotatably connected to the positioning guide rail 11 and one end is threadedly connected to the base 1 to disassemble the positioning guide rail 11.

[0021] The ball pin conveying assembly 4 includes a connecting frame 14, a cylinder 15, a cylinder 2 16, a lifting plate 17, and a ball pin clamping component 18, all fixedly connected to the base 1. The connecting frame 14 is fixedly connected to the base 1 by welding, providing a high level of stability. The cylinder 15 is fixedly connected to the connecting frame 14. The cylinder 15 is detachable and fixed by bolts to the connecting frame. The cylinder 2 16 is slidably connected to the connecting frame 14, and the output shaft of the cylinder 15 is connected to the air... Cylinder 2 16 is fixedly connected. Cylinder 1 15 can drive cylinder 2 16 to move, so that cylinder 2 16 moves to the required position. Lifting plate 1 17 is lifted and connected to connecting frame 1 14, and the output shaft of cylinder 2 16 is fixedly connected to lifting plate 1 17. Conveying robot 3 is fixedly connected to the bottom surface of lifting plate 1 17. Ball pin positioning seat 42 is fixedly connected to base 1. Ball pin positioning seat 42 can be arranged opposite to conveying robot 3. Cylinder 2 16 can drive lifting plate 17 to lift and lower, so that the movement of conveying robot 3 can be realized. The ball pin clamping component 18 includes a clamping column 19, a support plate 20, a cylinder 21, and a connecting frame 22. The support plate 20 is detachably and fixedly connected to the connecting frame 22, and the support plate 20 has a positioning hole 23, which is opposite to the center position of the ball seat positioning seat 13. The clamping column 19 is flexibly connected to the connecting frame 22, and the cylinder 21 is fixedly connected to the connecting frame 22. The output shaft of the cylinder 21 is fixedly connected to the clamping column 19. The diameter of the clamping column 19 is smaller than the diameter of the positioning hole 23. The principle of this structure is as follows: After the ball pin is clamped by the conveying robot 3, the lifting plate 17 is reset. The cylinder 15 is used to move the conveying cylinder 2 16, so that the cylinder 2 16 drives the lifting plate to move to the required position. The lifting plate 17 is used to move the conveying robot 3 to move the ball pin above the positioning hole 23. Then, the cylinder 3 21 drives the clamping column 19 to move, so that the clamping column 19 enters the ball pin through the positioning hole 23 and onto the ball seat, thereby realizing the installation of the ball pin.

[0022] In this invention, a sealing cap positioning seat 24 is fixedly connected to the turntable 9 to seal the cap. The sealing cap conveying assembly 6 includes a connecting frame 3 25, a cylinder 4 26, and a cylinder 5 27. The connecting frame 3 25 is fixedly connected to the base 1, the cylinder 4 26 is fixedly connected to the connecting frame 3 25, the cylinder 5 27 is slidably connected to the connecting frame 3 25, the output shaft of the cylinder 4 26 is fixedly connected to the cylinder 5 27, the sealing cap suction cup 5 is lifted and lowered connected to the connecting frame 3 25, and the output shaft of the cylinder 5 27 is fixedly connected to the sealing cap suction cup 5. The principle of this structure is as follows: the personnel place the sealing cover on the sealing cover positioning seat 24 in advance, use the sealing cover suction cup 5 to pick up the sealing cover, and drive the cylinder 4 26 and cylinder 5 27 to move the sealing cover to the ball seat, so that the sealing cover can be installed.

[0023] The riveting assembly 8 of this invention includes a connecting frame 28, a lifting seat 29, and a rotating column 30. The connecting frame 28 is fixedly connected to the base 1. The lifting seat 29 is driven to rise and fall and is connected to the connecting frame 28. The rotating column 30 is driven to rotate and is connected to the bottom surface of the lifting seat 29. The rotating column 30 can be arranged opposite to the ball seat. The riveting disc 7 is fixedly connected to the end of the rotating column 30 near the ball seat. The lifting seat 29 is driven by a cylinder 46, which is fixedly connected to the connecting frame 28 and its output shaft is fixedly connected to the lifting seat 29, thus realizing the raising and lowering of the lifting seat 29. The rotating column 30 is driven by a motor 47. The output shaft of the motor 47 is fixedly connected to a pulley 48, and the pulley 49 is fixedly connected to the rotating column 30. The rotation of the riveting disc 7 can be realized by connecting the pulley 48 and the pulley 49 with a belt. The motor 47 is fixedly connected to the lifting seat 29. The structural principle is as follows: the lifting seat 29 can drive the rotating column 30 to move the riveting disc 7 closer to the ball seat. By using the rotation of the rotating column 30, the riveting disc 7 can be riveted to the ball seat, thereby realizing the assembly of the ball seat.

[0024] The present invention has a limiting baffle 31 fixedly connected to the connecting frame. The limiting baffle 31 can limit the movement of cylinder 27. Furthermore, a storage box 32 with a top slot 38 is fixedly connected to the limiting baffle 31 to facilitate the placement of parts by personnel.

[0025] The present invention fixes a limiting post 33 to the support plate 20 and a limiting plate 34 to the pressing post 19. The limiting plate 34 and the limiting post 33 are slidably connected, and the limiting bolt 35 threaded on the limiting post 33 can be used to limit the lifting and lowering of the pressing post 19.

[0026] In this invention, the sealing cap positioning seat 24 includes a disassembly seat 36 and a positioning block 37. The disassembly seat 36 is detachably connected to the base 1, and the positioning seat is threadedly connected to the disassembly seat 36. The top of the positioning block 37 has a slot 38 for the sealing cap to enter. The disassembly seat 36 is detached from the base 1 by bolts, which facilitates personnel to replace the disassembly seat 36. The positioning block 37 is threadedly connected to the disassembly seat 36, which facilitates personnel to replace the positioning block 37.

[0027] The ball seat positioning base 13 of the present invention has a connecting hole 39 on its top surface and a connecting hole 40 on the connecting hole 39. The ball seat positioning base 13 has a pull rod groove 41 that communicates with the connecting hole 39. The ball seat can be positioned through the connecting hole 39 and the connecting hole 40, while the pull rod groove 41 facilitates the placement of the ball seat rod.

[0028] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A four-station assembly line for pre-riveting ball heads, comprising a base (1), characterized in that, A ball head positioning and transmission mechanism (2) is horizontally arranged on the base (1). A ball pin conveying assembly (4) with a conveying robot (3), a sealing cover conveying assembly (6) with a sealing cover suction cup (5), and a riveting assembly (8) with a riveting disc (7) are fixedly connected around the center point of the ball head positioning and transmission mechanism (2) on the base (1). The ball head positioning and transmission mechanism (2) includes a turntable (9), four positioning guide rails (11), four positioning support seats (12), and four ball seat positioning seats (13); The turntable (9) is driven to rotate and is connected to the base (1); The four ball seat positioning seats (13) are all disassembled and fixedly connected to the turntable (9). The four ball seat positioning seats (13) can be rotated to be arranged opposite to the conveying robot (3), the sealing cover suction cup (5) and the riveting plate (7); The positioning guide rails (11) are all detached and fixedly connected to the top surface of the turntable (9) located on the two adjacent ball seat positioning seats (13); The positioning support (12) is slidably connected to the positioning guide rail (11), and one end can be locked with the positioning guide rail (11); The ball pin conveying assembly (4) includes a connecting frame (14), a cylinder (15), a cylinder (16), a lifting plate (17), and a ball pin clamping component (18) fixedly connected to the base (1). The connecting frame (14) is fixedly connected to the base (1), the cylinder (15) is fixedly connected to the connecting frame (14), the cylinder (16) is slidably connected to the connecting frame (14), and the output shaft of the cylinder (15) is fixedly connected to the cylinder (16). The lifting plate (17) is lifted and connected to the connecting frame (14), and the output shaft of the cylinder (16) is fixedly connected to the lifting plate (17). The conveying robot (3) is fixedly connected to the bottom surface of the lifting plate (17). A ball pin positioning seat (42) is fixedly connected to the base (1), and the ball pin positioning seat (42) can be arranged opposite to the conveying robot (3). The ball pin clamping component (18) includes a clamping column (19), a support plate (20), a cylinder three (21), and a connecting frame two (22). The support plate (20) is detachably and fixedly connected to the connecting frame two (22), and a positioning hole (23) is provided on the support plate (20). The positioning hole (23) is positioned opposite to the center of the ball seat positioning seat (13). The clamping column (19) is lifted and connected to the connecting frame two (22). The cylinder three (21) is fixedly connected to the connecting frame two (22), and the output shaft of the cylinder three (21) is fixedly connected to the clamping column (19). The diameter of the clamping column (19) is smaller than the diameter of the positioning hole (23).

2. The four-station assembly line for pre-riveting ball heads according to claim 1, characterized in that: The turntable (9) is fixedly connected to a sealing cover positioning seat (24) corresponding to the ball seat positioning seat (13). The sealing cover conveying assembly (6) includes a connecting frame three (25), a cylinder four (26) and a cylinder five (27). The connecting frame three (25) is fixedly connected to the base (1). The cylinder four (26) is fixedly connected to the connecting frame three (25). The cylinder five (27) is slidably connected to the connecting frame three (25). The output shaft of the cylinder four (26) is fixedly connected to the cylinder five (27). The sealing cover suction cup (5) is lifted and lowered on the connecting frame three (25), and the output shaft of the cylinder five (27) is fixedly connected to the sealing cover suction cup (5).

3. A four-station assembly line for pre-riveting ball heads according to claim 1, characterized in that: The riveting assembly (8) includes a connecting frame four (28), a lifting seat (29), and a rotating column (30). The connecting frame four (28) is fixedly connected to the base (1). The lifting seat (29) is driven to lift and is connected to the connecting frame four (28). The rotating column (30) is driven to rotate and is connected to the bottom surface of the lifting seat (29). The rotating column (30) can be arranged opposite to the ball seat. The riveting disc (7) is fixedly connected to the end of the rotating column (30) near the ball seat.

4. A four-station assembly line for pre-riveting ball heads according to claim 2, characterized in that: A limiting baffle (31) is fixedly connected to the connecting frame three (25), and a storage box (32) with a top slot (38) is fixedly connected to the limiting baffle (31).

5. A four-station assembly line for pre-riveting ball heads according to claim 1, characterized in that: The top of the support plate (20) is fixedly connected to a limiting post (33), and a limiting plate (34) is fixedly connected to the clamping post (19). One end of the limiting plate (34) is slidably connected to the limiting post (33), and a limiting bolt (35) is threadedly connected to the limiting post (33).

6. A four-station assembly line for pre-riveting ball heads according to claim 2, characterized in that: The sealing cover positioning seat (24) includes a disassembly seat (36) and a positioning block (37). The disassembly seat (36) is detachably connected to the base (1), and the positioning seat is threadedly connected to the disassembly seat (36). The top of the positioning block (37) has a slot (38) for the sealing cover to enter.

7. A four-station assembly line for pre-riveting ball heads according to claim 1, characterized in that: The ball seat positioning base (13) has a connecting hole 1 (39) on its top surface, a connecting hole 2 (40) on the connecting hole 1 (39), and a pull rod groove (41) communicating with the connecting hole 1 (39) on the ball seat positioning base (13).

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