Middle shaft spin riveting process and spin riveting device

Abstract

The invention discloses a center shaft spin riveting process and a spin riveting device, the center shaft spin riveting device comprises a workbench, a plurality of working positions are formed on the workbench, and a clamping tool is mounted at each working position; the automatic riveting machine further comprises a telescopic pressing rod and a spin riveting device, the telescopic pressing rod is located on the upper side of the workbench, and the spin riveting device is located on the lower side of the workbench. The telescopic pressing rod is provided with a downward and telescopic abutting end, the spin riveting device comprises a spin riveting frame, a spin riveting motor and a spin riveting head set, the spin riveting motor is fixedly supported through the spin riveting frame and provided with an upward rotating shaft, the rotating shaft and the abutting end are coaxially arranged, the spin riveting head set is installed on the rotating shaft, and the spin riveting head set is connected with the spin riveting frame. And the lower end of the middle shaft of the workpiece is pressed and spin-riveted. The rotary riveting device can stably and effectively realize the rotary riveting action.

Description

Technical Field

[0001] This invention relates to riveting equipment, and more specifically, to a central shaft riveting device and a central shaft riveting process. Background Technology

[0002] During the riveting process, the riveting head presses against the workpiece to be riveted, and through compression and rotation, the workpiece is riveted, forming a riveting connection point at the riveting location. The riveting process requires two types of action: axial rotation and axial movement. Therefore, the riveting head of the riveting equipment is usually driven by a motor. The riveting head is mounted on the motor shaft, which drives its rotation. However, during riveting, the riveting head will be subjected to a significant axial load. If this load is directly applied to the motor shaft, it will be detrimental to the stable operation of the motor and may even affect its service life.

[0003] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a central shaft riveting process and riveting device.

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

[0006] A central shaft riveting device includes a worktable with several working positions, each with a clamping fixture installed. It also includes a telescopic pressure rod and a riveting device. The telescopic pressure rod is located on the upper side of the worktable, and the riveting device is located on the lower side of the worktable. The telescopic pressure rod has a downward-facing and retractable pressing end. The riveting device includes a riveting frame, a riveting motor, and a riveting head assembly. The riveting motor is fixedly supported by the riveting frame and has an upward-facing rotating shaft coaxial with the pressing end. The riveting head assembly is mounted on the rotating shaft and is used for pressing and riveting the lower end of the central shaft of the workpiece.

[0007] The present invention is further configured such that the riveting head assembly includes a first connecting sleeve, a second connecting sleeve, and a riveting head. The first connecting sleeve is disposed on the upper end of the rotating shaft and can rotate synchronously with the rotating shaft axially and slide relative to the rotating shaft axially. The riveting head is installed on the upper end of the first connecting sleeve. The second connecting sleeve is located at the lower end of the first connecting sleeve and is fitted onto the outer circumference of the rotating shaft, and can rotate relative to the rotating shaft axially.

[0008] The present invention is further configured such that a second inclined surface is formed on the lower side of the second connecting sleeve; a wedge block is laterally slidably connected on the riveting frame, and the wedge block is pushed and slid by a cylinder; a first inclined surface adapted to the second inclined surface is formed on the upper side of the wedge block, and the wedge block can move to the lower side of the second connecting sleeve and press and push the second connecting sleeve upward.

[0009] The present invention is further configured such that a guide groove is provided on the outer periphery of the upper half of the rotating shaft, the guide groove is oriented vertically, and a plurality of guide blocks are fixedly connected to the inner periphery of the connecting sleeve, the guide blocks being slidably connected in the guide groove.

[0010] The present invention is further configured such that an annular groove is formed on the inner circumference of the first connecting sleeve, and a bearing is installed in the annular groove. The bearing includes an upper support ring and a lower support ring. An extension cylinder is integrally connected to the lower side of the lower support ring, and the extension cylinder is coaxially and fixedly connected to the second connecting sleeve.

[0011] The present invention is further configured such that the bearing is a thrust bearing, the upper support ring and the lower support ring are supported by a plurality of rollers, and each roller is supported by a roller cage; the upper support ring abuts against the upper inner side of the annular groove, the lower end of the annular groove is blocked by an annular stop, and the lower support ring is limited by the stop.

[0012] The present invention is further configured such that the upper end of the connecting sleeve is provided with a receiving hole, the riveting head extends into the receiving hole, the riveting head is rotatably connected to the connecting sleeve through a transverse linkage shaft, and the inner diameter of the receiving hole is larger than that of the riveting head, and the riveting head can form a swing amplitude of 3-10° in the receiving hole.

[0013] The present invention is further configured such that the center of gravity of the riveting head is located below the linkage shaft, the lower end of the riveting head is provided with a linkage hole, and the lower end of the linkage hole is formed with a flared portion; the upper end of the rotating shaft is fixedly connected with a linkage block, the linkage block and the linkage hole are adapted to each other and can be embedded in the linkage hole to limit the sway of the riveting head.

[0014] The present invention is further configured such that the riveting head can rise along with the connecting sleeve, and the linkage block is embedded in the linkage hole in the first part of the stroke to keep the riveting head axis vertical; in the second part of the stroke, the linkage block disengages from the linkage hole, and the riveting head can deflect around the linkage shaft.

[0015] The present invention is further configured such that the worktable is rotatably mounted on the frame and driven to rotate by a servo rotary driver, and four clamping fixtures are evenly mounted on the upper side of the worktable.

[0016] This invention also provides a spin-riveting process for a central shaft, using the spin-riveting device described above to rivet the central shaft of a workpiece. During the riveting process, the workpiece is first installed in a clamping fixture, which stably clamps the workpiece. Then, the workpiece's accessories and the central shaft are installed within the workpiece. A telescopic pressure rod and the riveting device work together to rivet the lower end of the central shaft.

[0017] In summary, the present invention has the following beneficial effects:

[0018] In this solution, the vertical riveting pressure load needs to be transmitted between connecting sleeve one and connecting sleeve two. Through connecting sleeve two and the wedge block, the axial load of riveting can be transmitted to the riveting frame and the machine frame, avoiding the motor shaft from being directly subjected to axial pressure and avoiding the motor shaft from being subjected to excessive axial load, which would affect the normal operation of the motor. In this solution, the shaft only bears the axial torque load, which can reduce the axial pressure load. Attached Figure Description

[0019] Figure 1 This is a perspective view of a central shaft riveting device according to Embodiment 1;

[0020] Figure 2 This is a schematic diagram of the telescopic pressure bar, riveting device, and clamping fixture in Example 1;

[0021] Figure 3 This is a schematic diagram of the riveting device and clamping fixture in Example 1;

[0022] Figure 4 This is a schematic diagram of the riveting device structure in Example 1;

[0023] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0024] Figure 6 This is a schematic diagram of the riveting device structure in Example 2;

[0025] Figure 7 This is a schematic diagram of the first state of the riveting head in Embodiment 2;

[0026] Figure 8 This is a schematic diagram of the second state of the riveting head in Embodiment 2;

[0027] Reference numerals: 1. Frame; 2. Upper support platform; 3. Worktable; 4. Servo rotary driver; 5. Clamping fixture; 6. Workpiece; 61. Central shaft; 7. Telescopic pressure rod; 71. Pressing end; 8. Riveting device; 80. Riveting frame; 81. Riveting motor; 811. Rotating shaft; 812. Guide groove; 82. Cylinder; 83. Wedge block; 831. Inclined surface one; 9. Riveting head assembly; 91. Connecting sleeve one; 911. Guide slider; 912. Annular groove; 913. Annular stop block; 914. Upper support ring; 915. Lower support ring; 916. Roller; 917. Extension cylinder; 92. Connecting sleeve two; 921. Inclined surface two; 93. Riveting head; 931. Riveting pressing surface; 932. Linkage shaft; 933. Accommodation hole; 934. Linkage hole; 935. Flared part; 936. Linkage block; 937. Screw. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] This embodiment discloses a central shaft riveting device, referring to... Figures 1-5 As shown, the entire device is supported by a frame 1, on which a workbench 3 is installed. Several working positions are formed on the workbench 3, and a clamping fixture 5 is installed at each working position.

[0031] The workpiece 6 to be riveted can be riveted using the clamping fixture 5. The specific shape and structure of the fixture and the clamping distance can be set according to the shape of the workpiece. A central shaft 61 is installed in the middle of the workpiece 6. In this embodiment, the lower end of the central shaft 61 is riveted using this device.

[0032] The worktable 3 is roughly horizontal and is rotatably mounted on the frame 1, driven by a servo rotary driver 4. The servo rotary driver 4 drives the worktable 3 to rotate, and the rotation angle of the worktable 3 can be specifically set according to the working position on the worktable 3. For example, four working positions are formed on the worktable 3 and distributed in a circular array, with a clamping fixture 5 installed at each working position; correspondingly, the worktable 3 rotates 90° each time, allowing the worktable 3 to drive the workpiece 6 to circulate among the positions, forming four processing steps for the workpiece 1.

[0033] Reference Figure 1 , Figure 2 As shown, the central shaft riveting device also includes a telescopic pressure rod 7 and a riveting device 8. The telescopic pressure rod 7 is supported and installed on the upper side of the worktable 3 by the upper support platform 2, and the riveting device 8 is located on the lower side of the worktable 3. The telescopic pressure rod 7 and the riveting device 8 are arranged in a vertically opposite position and can be opposite to one of the assembly clamping fixtures 5 on the worktable 3. Through the cooperation of the telescopic pressure rod 7 and the riveting device 8, the central shaft 61 of the workpiece 1 can be riveted.

[0034] The telescopic pressure rod 7 can be a cylinder. The telescopic pressure rod 7 has a downward-facing and telescopic pressing end 71. The pressing end 71 is coaxially arranged with the central shaft 61 of the workpiece 6 at the corresponding working position. By pressing down the pressing end 71, a blocking limit can be formed at the upper end of the central shaft 61.

[0035] Reference Figures 3-5As shown, the riveting device 8 includes a riveting frame 80, a riveting motor 81, and a riveting head assembly 9. The riveting motor 81 is fixedly supported by the riveting frame 80 and has an upward-facing rotating shaft 811. The rotating shaft 811 is coaxial with the pressing end 71 and also coaxial with the central shaft 61 of the workpiece 1 at that position. The riveting head assembly 9 is mounted on the rotating shaft 811 and is used to press and rivet the lower end of the central shaft 61 of the workpiece 6.

[0036] Reference Figure 4 As shown, the riveting head assembly 9 includes a first connecting sleeve 91, a second connecting sleeve 92, and a riveting head 93. The first connecting sleeve 91 and the second connecting sleeve 92 are sequentially fitted onto the outer periphery of the rotating shaft 811 from top to bottom. The first connecting sleeve 91 is fitted onto the upper end of the rotating shaft 811, and there is mutual linkage between the first connecting sleeve 91 and the rotating shaft 811. The first connecting sleeve 91 can rotate synchronously with the rotating shaft 811 axially and can slide relative to the rotating shaft 811 axially. Specifically, a guide groove 812 is formed on the outer periphery of the upper half of the rotating shaft 811, and the guide groove 812 runs vertically. Several guide grooves 812 are formed along the outer periphery of the rotating shaft 811, forming a spline-like structure. Several guide sliders 911 are fixedly connected to the inner periphery of the first connecting sleeve 91. The shape of the guide sliders 911 is adapted to the guide groove 812, and the guide sliders 911 are slidably connected within the guide groove 812. By sliding and adapting the guide slider 911 and the guide groove 812 to each other, axial sliding adjustment can be achieved, and the torque of the axis rotation can be transmitted, thereby enabling the linkage between the rotating shaft 811 and the connecting sleeve 91.

[0037] The riveting head 93 is installed on the upper end of the connecting sleeve 91. During the riveting process of the lower end of the central shaft 61, the riveting pressure surface 931 at the upper end of the riveting head 93 applies pressure to the lower end of the central shaft 61.

[0038] Reference Figure 4 As shown, the second connecting sleeve 92 is located at the lower end of the first connecting sleeve 91 and is fitted onto the outer circumference of the rotating shaft 811. The second connecting sleeve 92 can rotate axially relative to the rotating shaft 811, and transmission is achieved between the rotating shaft 811 and the second connecting sleeve 92 through the first connecting sleeve 91.

[0039] Reference Figure 4 As shown, a bevel 921 is formed on the lower side of the connecting sleeve 92. Additionally, a wedge block 83 is laterally slidably connected to the riveting bracket 80. The wedge block 83 is pushed and slid by the cylinder 82. (Refer to...) Figure 4 As shown, the wedge block 83 can slide laterally left and right. An inclined surface 831 is formed on the upper side of the wedge block 83, which is adapted to fit the inclined surface 921. Part of the wedge block 83 is always located below the connecting sleeve 92. The mutual contact between the inclined surface 831 and the inclined surface 921 supports the connecting sleeve 92 and prevents excessive deflection of the connecting sleeve 92.

[0040] Furthermore, due to the presence of the rotating shaft 811, a clearance slot can be opened in the middle of the wedge block 83, allowing the wedge block 83 to smoothly move into the lower side of the connecting sleeve 2 92. Driven by the cylinder 82, the wedge block 83 can move to the lower side of the connecting sleeve 2 92 and push the connecting sleeve 2 92 upward. When the cylinder 82 pushes the wedge block 83 to the left, the thickness of the part of the wedge block 83 embedded in the connecting sleeve 2 92 will gradually change. Through the pressing action of the inclined surface 1 831 and the inclined surface 2 921, the connecting sleeve 2 92, the connecting sleeve 1 91, and the riveting head 93 at the upper end can be moved upward, pressing against the lower end of the central shaft 61 of the workpiece 6. Then, the rotating shaft 811 of the riveting motor 81 drives the connecting sleeve 1 91 and the riveting head 93 to rotate, realizing the riveting process.

[0041] The riveting pressure load in the vertical direction needs to be transmitted between connecting sleeve 1 91 and connecting sleeve 2 92. The axial load of the riveting is supported by connecting sleeve 2 92 and wedge block 83, preventing the motor shaft 811 from being subjected to excessive axial load and affecting the normal service life of the motor. In this embodiment, the shaft 811 only bears the axial torque load, reducing the axial pressure load.

[0042] Reference Figure 4 , Figure 5 As shown, an annular groove 912 is formed on the inner circumference of the connecting sleeve 91, located in the lower half of the connecting sleeve 91. A bearing is installed within the annular groove 912, comprising an upper support ring 914 and a lower support ring 915. The upper and lower support rings 914 and 915 are arranged in a stacked annular structure and are both fitted around the outer circumference of the rotating shaft 811. The outer circumference of the upper support ring 914 is slightly larger to match the inner circumference of the annular groove 912, allowing it to fit stably within the groove and be supported by the upper side of the groove 912. The inner circumferences of both the upper and lower support rings 914 and 915 are slightly larger than the rotating shaft 811 to prevent contact wear between them and the outer circumference of the rotating shaft 811.

[0043] The outer circumference of the lower support ring 915 is smaller than the inner circumference of the annular groove 912. An extension cylinder 917 is integrally connected to the lower side of the lower support ring 915, extending downwards and coaxially fixedly connected to the connecting sleeve 92. The connecting sleeve 92 can rotate synchronously with the lower support ring 915 of the bearing for adjustment.

[0044] In addition, an annular stop 913 is fixedly connected to the lower end of the annular groove 912, which can form a block at the lower end of the annular groove 912. The lower support ring 915 can be blocked and limited by the annular stop 913, preventing the lower support ring 915 of the bearing from falling off from the lower end of the connecting sleeve 91.

[0045] In this embodiment, the bearing is a thrust bearing. The upper support ring 914 and the lower support ring 915 are supported by several rollers 916, and each roller 916 is supported by a roller cage. The upper support ring 914, the rollers 916 and the lower support ring 915 can transmit the axial load of riveting and can stably support the load, avoiding the adverse effect of riveting pressure on the motor shaft.

[0046] This embodiment also discloses a spin-riveting process for a central shaft, using the spin-riveting device described above to rivet the central shaft 61 of workpiece 1. During the riveting process, workpiece 6 is first installed at the clamping fixture 5, which stably clamps workpiece 6. Then, the accessories of workpiece 6 and the central shaft 61 are installed into workpiece 1. The lower end of the central shaft 61 is riveted using a telescopic pressure rod 7 and the riveting device 8 working together.

[0047] Example 2

[0048] This embodiment discloses a central shaft riveting device, which is based on Embodiment 1 and further refers to... Figures 6-8 A detailed description is provided. In Embodiment 1, the riveting head 93 is fixedly installed at the upper end of the connecting sleeve 91, and a riveting pressing surface 931 is formed at the upper end of the riveting head 93. In this embodiment, the connection structure between the riveting head 93 and the connecting sleeve 91 is further designed.

[0049] Reference Figures 6-8 As shown, in this embodiment, the upper end of the connecting sleeve 91 is provided with a receiving hole 933, and the riveting head 93 extends into the receiving hole 933. The riveting head 93 is rotatably connected to the connecting sleeve 91 via a transverse linkage shaft 932. The inner diameter of the receiving hole 933 is larger than that of the riveting head 93. Within the range of the receiving hole 933, the riveting head 93 can achieve a small deflection movement around the linkage shaft 932.

[0050] In this embodiment, the riveting head 93 can form a swing amplitude of 3-10° in the receiving hole 933. The state of the riveting head 93 after deflection is shown in the figure. Figure 8 As shown.

[0051] A linkage block 936 is fixedly connected to the upper end of the rotating shaft 811. The linkage block 936 is roughly cylindrical in shape and is compatible with the linkage hole 934, allowing it to be inserted into the linkage hole 934. When the linkage block 936 is inserted into the linkage hole 934, its deflection can be limited, restricting the wobble of the riveting head 93 and keeping the riveting head 93 in a stable state.

[0052] A connecting stroke is formed between the linkage block 936 and the linkage hole 934, which is less than the lifting stroke of the riveting head assembly 9. During the lifting and lowering process of the riveting head assembly 9, the connecting sleeve 1 91, the connecting sleeve 2 92, and the riveting head 93 will move upward, while the rotating shaft 811 will remain at a constant height. The linkage block 936 at the upper end of the rotating shaft 811 will also remain at a constant height, thereby allowing the linkage block 936 and the linkage hole 934 at the lower end of the riveting head 93 to move up and down.

[0053] Specifically, the riveting head 93 rises with the connecting sleeve 91. At the beginning of its stroke, the linkage block 936 engages with the linkage hole 934. The linkage block 936 and the linkage hole 934 provide a limiting mechanism, maintaining the riveting head 93 in a roughly vertical position. At the end of its stroke, the linkage block 936 disengages from the linkage hole 934, freeing the riveting head 93 from its constraint. The riveting head 93 can then deflect around the linkage shaft 932, producing a small deflection. After the riveting head 93 deflects, its upper riveting abutment surface 931 also deflects, aligning with the riveting state of the lower end of the central shaft 61. During the riveting process, the inclined riveting abutment surface 931 slightly compresses the metal material at the riveting position towards the center, forming a conical riveting structure.

[0054] Furthermore, the linkage shaft 932 is eccentrically positioned, and after the linkage block 936 disengages from the linkage hole 934, the riveting head 93 will automatically produce a slight deflection. During the riveting process, the riveting head 93 is in a state where it can swing, and during rotation, it will produce a slight fluctuation. The riveting head 93 can adapt to the riveting position and achieve adaptive adjustment.

[0055] Furthermore, the center of gravity of the riveting head 93 is located below the linkage shaft 932. A linkage hole 934 is provided at the lower end of the riveting head 93, and a flared portion 935 is formed at the lower end of the linkage hole 934. The flared portion 935 gradually widens in the end direction, and can play a guiding role in the process of the linkage block 936 being inserted into the linkage hole 934, ensuring that the linkage block 936 can be smoothly inserted during the descent of the linkage hole 934.

[0056] Furthermore, referring to Figure 7 , 8 As shown, a transverse threaded hole is formed on the side wall of the connecting sleeve 91, and the position of the threaded hole is connected to the receiving hole 933. A screw 937 is threaded into the threaded hole, and the end of the screw 937 extends into the receiving hole 933 through the threaded hole. The maximum deflection amplitude of the riveting head 93 can be limited and adjusted by the screw 937.

[0057] During the adjustment process, if it is necessary to adjust the forming state of the riveting position, the screw 937 can be adjusted to a certain extent, thereby adjusting the maximum range of deflection of the riveting head 93. This allows for easy adjustment of the riveting state and facilitates adjustment of the shape parameters of the riveted joint.

[0058] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A central shaft riveting device, characterized in that, The device includes a workbench (3) having several working positions, each of which is equipped with a clamping fixture (5); it also includes a telescopic pressure rod (7) and a riveting device (8), the telescopic pressure rod (7) being located on the upper side of the workbench (3) and the riveting device (8) being located on the lower side of the workbench (3); the telescopic pressure rod (7) having a downward-facing and telescopic pressing end (71), the riveting device (8) including a riveting frame (80), a riveting motor (81) and a riveting head assembly (9), the riveting motor (81) being fixedly supported by the riveting frame (80), the riveting motor (81) having an upward-facing rotating shaft (811), the rotating shaft (811) being coaxially arranged with the pressing end (71), and the riveting head assembly (9) being installed on the rotating shaft (811) for pressing and riveting the lower end of the central shaft (61) of the workpiece (6).

2. The central shaft riveting device according to claim 1, characterized in that, The riveting head assembly (9) includes a first connecting sleeve (91), a second connecting sleeve (92), and a riveting head (93). The first connecting sleeve (91) is sleeved on the upper end of the rotating shaft (811) and can rotate synchronously with the rotating shaft (811) and slide relative to the rotating shaft (811) axially. The riveting head (93) is installed on the upper end of the first connecting sleeve (91). The second connecting sleeve (92) is located at the lower end of the first connecting sleeve (91) and is sleeved on the outer periphery of the rotating shaft (811) and can rotate relative to the rotating shaft (811) axially.

3. The central shaft riveting device according to claim 2, characterized in that, The lower side of the connecting sleeve 2 (92) forms a second inclined surface (921); the riveting frame (80) is laterally connected to a wedge block (83), which is pushed and slid by a cylinder (82); the upper side of the wedge block (83) forms a first inclined surface (831) that matches the second inclined surface (921), and the wedge block (83) can move to the lower side of the connecting sleeve 2 (92) and press and push the connecting sleeve 2 (92) upward.

4. A central shaft riveting device according to claim 2, characterized in that, The upper half of the rotating shaft (811) has a guide groove (812) on its outer periphery. The guide groove (812) runs vertically. The inner periphery of the connecting sleeve (91) is fixedly connected with a number of guide blocks (911), which are slidably connected in the guide groove (812).

5. A central shaft riveting device according to claim 2, characterized in that, The inner circumference of the first connecting sleeve (91) is provided with an annular groove (912), and a bearing is installed in the annular groove (912). The bearing includes an upper support ring (914) and a lower support ring (915). An extension cylinder (917) is integrally connected to the lower side of the lower support ring (915). The extension cylinder (917) is coaxially and fixedly connected to the second connecting sleeve (92).

6. A central shaft riveting device according to claim 5, characterized in that, The bearing is a thrust bearing. The upper support ring (914) and the lower support ring (915) are supported by a number of rollers (916), and each roller (916) is supported by a roller cage. The upper support ring (914) abuts against the upper inner side of the annular groove (912). The lower end of the annular groove (912) is blocked by an annular stop (913), and the lower support ring (915) is limited by the stop.

7. A central shaft riveting device according to claim 4, characterized in that, The upper end of the connecting sleeve (91) is provided with a receiving hole (933). The riveting head (93) extends into the receiving hole (933). The riveting head (93) is rotatably connected to the connecting sleeve (91) through a transverse linkage shaft (932). The inner diameter of the receiving hole (933) is larger than that of the riveting head (93). The riveting head (93) can form a swing amplitude of 3-10° in the receiving hole (933).

8. A central shaft riveting device according to claim 7, characterized in that, The center of gravity of the riveting head (93) is located below the linkage shaft (932). The lower end of the riveting head (93) is provided with a linkage hole (934), and the lower end of the linkage hole (934) is formed with a flared part (935). The upper end of the rotating shaft (811) is fixedly connected with a linkage block (936). The linkage block (936) is adapted to the linkage hole (934) and can be embedded in the linkage hole (934) to limit the swing of the riveting head (93). The riveting head (93) can rise with the connecting sleeve (91). In the first part of the stroke, the linkage block (936) is embedded in the linkage hole (934), which can keep the axis of the riveting head (93) vertical. In the second part of the stroke, the linkage block (936) disengages from the linkage hole (934), and the riveting head (93) can deflect around the linkage shaft (932).

9. A central shaft riveting device according to any one of claims 1-8, characterized in that, The worktable (3) is rotatably mounted on the frame (1) and driven to rotate by a servo rotary driver (4). Four clamping fixtures (5) are evenly mounted on the upper side of the worktable (3).

10. A central shaft riveting process, characterized in that, The central shaft (61) of the workpiece (1) is riveted using the central shaft riveting device as described in claim (9).

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