Electric hydraulic riveting tool

Abstract

The utility model discloses an electric hydraulic riveting tool which comprises a riveting working head and a pump body. The riveting working head comprises a cylinder body, a hollow piston shaft and a rear end cover; a hydraulic cavity is formed by the cylinder body and the rear end cover, a first oil way and a second oil way are arranged in the cylinder body, a third oil way and a fourth oil way are arranged on the pump body, the riveting work head is communicated with a broken nail guide pipe, the rear end of the broken nail guide pipe is communicated with a nail collecting box, the outer wall of the broken nail guide pipe is sleeved with an adaptive plate, and an oil passing way is arranged in the adaptive plate. The oil passing ways comprise the first oil passing way and the second oil passing way, a containing groove is formed in the adaptation plate, a damping connector is arranged in the containing groove, an axial oil way and a radial oil way are arranged in the damping connector, the axial oil way is communicated with the radial oil way, and the axial oil way is communicated with the first oil way or the second oil way. The electric hydraulic riveting tool can effectively reduce vibration transmitted by the riveting working head to other structures such as a pump body, and the service life of the whole riveting device is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of riveting device design technology, specifically to an electro-hydraulic riveting tool. Background Technology

[0002] Electro-hydraulic riveting devices typically consist of a motor, a hydraulic cylinder, a main body, and a riveting head. During operation, the reciprocating motion of the riveting head in existing electro-hydraulic riveting devices generates significant vibrations. These vibrations are transmitted to the pump body, hydraulic cylinder, and motor, which can easily affect the stability of the connections between them, leading to loose bolts, breakage, structural damage, and ultimately impacting the overall service life of the riveting device. Summary of the Invention

[0003] The purpose of this utility model is to provide an electro-hydraulic riveting tool. This electro-hydraulic riveting tool can effectively reduce the vibration transmitted from the riveting head to the pump body and other structures, and extend the overall service life of the riveting device.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] An electro-hydraulic riveting tool includes a riveting head and a pump body; the riveting head includes a cylinder, a hollow piston shaft, and a rear end cover, the cylinder and the rear end cover forming a hydraulic chamber for the hollow piston shaft to move, the cylinder having a first oil passage connected to the front end of the hydraulic chamber and a second oil passage connected to the rear end of the hydraulic chamber; the pump body having a third oil passage connected to the first oil passage and a fourth oil passage connected to the second oil passage;

[0006] The riveting head of this utility model is connected to a broken nail guide tube, and a nail receiving box is connected to the rear end of the broken nail guide tube. An adapter plate is sleeved on the outer wall of the broken nail guide tube. An oil passage is provided in the adapter plate. The oil passage includes a first oil passage for connecting the first oil passage and the third oil passage and a second oil passage for connecting the second oil passage and the fourth oil passage. A receiving groove is provided in the adapter plate, which is connected to the oil passage and parallel to the reciprocating motion direction of the riveting head. A shock-absorbing joint is provided in the receiving groove. The shock-absorbing joint has an axial oil passage extending along the axial direction of the shock-absorbing joint and a radial oil passage extending along the radial direction of the shock-absorbing joint. The axial oil passage and the radial oil passage are connected. The axial oil passage is connected to the first oil passage or the second oil passage. When the riveting head is in the working state, the length of the shock-absorbing joint in the receiving groove is always less than the length of the receiving groove and the radial oil passage is always connected to the oil passage. Its function is as follows: through the setting of the adapter plate, receiving groove and shock-absorbing joint, when the riveting working head generates axial reciprocating vibration, the vibration is transmitted to the shock-absorbing joint. The shock-absorbing joint performs axial reciprocating motion in the receiving groove, avoiding the vibration of the shock-absorbing joint from being transmitted to the adapter plate, thereby preventing the adapter plate from being vibrated and transmitted to other components such as the pump body and motor. This plays a role in extending the stability of the connection of various components in the riveting device and extending the service life of the entire riveting device. Through the setting of the broken nail guide tube, broken nails can be discharged and collected during the operation of the riveting working head. At the same time, the broken nail guide tube can position the adapter plate and the adapter plate can guide the broken nail guide tube.

[0007] Furthermore, the first oil passage includes a third oil port for connecting to the third oil passage, and the second oil passage includes a fourth oil port for connecting to the fourth oil passage. The axial oil passage is located at the front end of the adapter plate, and the third and fourth oil ports are located at the rear end of the adapter plate. The distances between the third and fourth oil ports and the plane containing the axes of the two axial oil passages are both greater than zero. This design, through the spatial relationship between the third and fourth oil ports and the axial oil passages, facilitates the misalignment of the riveting head and the pump body, preventing the vibration of the riveting head from being directly transmitted to the pump body.

[0008] Furthermore, the cylinder block is sealed with an oil distribution plate, and the end face of the damping joint facing the cylinder block is provided with a limiting outer edge. The opening of the axial oil passage is located on the end face of the limiting outer edge, and the side of the oil distribution plate facing away from the adapter plate is provided with a limiting groove for placing the limiting outer edge. Its function is to fix the damping joint between the oil distribution plate and the cylinder block by setting the limiting outer edge and the limiting groove.

[0009] Furthermore, the shock-absorbing joint has a sealing end at one end facing away from the limiting edge. The sealing end is interference-fitted with the receiving groove, and a radial oil passage is provided between the sealing end and the limiting edge. Its function is to prevent liquid from overflowing from the receiving groove through the setting of the sealing end and the design of the dimensional relationship between the sealing end and the receiving groove.

[0010] Furthermore, the radial oil passage has an annular sealing groove on each of its front and rear sides along the axial direction of the shock-absorbing joint at the opening on the side wall of the shock-absorbing joint. Sealing grooves for placing sealing rings are also provided between the radial oil passage and the sealing end, and between the radial oil passage and the outer edge of the limiting device. The sealing ring is a common existing technology and will not be described in detail. Its function is to allow a sealing ring that is interference-fitted with the receiving groove to be placed within the sealing groove, thereby increasing the sealing effect on both sides of the axial oil passage. This ensures that the radial oil passage is always connected to the oil passage during the riveting process, and that the oil passage is always located between the two sealing rings within the receiving groove.

[0011] Furthermore, the broken nail guide tube is coaxially arranged with the hollow piston shaft. A sealing plate is provided on the outer wall of the broken nail guide tube to seal the rear end of the rear end cover. A buffer section for mounting a buffer structure is provided near the sealing plate on the broken nail guide tube. An annular groove for embedding a ring retainer is provided at the end of the buffer section away from the sealing plate. With the adapter plate installed on the broken nail guide tube, the adapter plate is located in the middle of the buffer section. Buffer structures are provided between the adapter plate and the sealing plate, and between the adapter plate and the annular groove. The function of these buffer structures is to buffer the movement between the riveting head and the adapter plate. When the riveting head vibrates back and forth, the broken nail guide tube is driven to vibrate in the back and forth direction. The back and forth vibrations of the broken nail guide tube are buffered and dissipated by the buffer structures between the adapter plate and the sealing plate, and between the annular retainer and the adapter plate, respectively.

[0012] Furthermore, the buffer structure includes spaced-apart elastic pads and elastic rings. The elastic pads have a rectangular cross-section, and the elastic rings have a circular cross-section. Its function is that, by using buffer structures of different shapes spaced apart, the elastic rings can deform outwards when subjected to compression, changing the vibration direction from axial to radial. The elastic pads provide some support for the elastic rings. Through the intermittent arrangement of multiple elastic rings and elastic pads, a better shock absorption effect can be achieved while avoiding the need for large-diameter elastic rings that would occupy too much space.

[0013] Furthermore, a support frame for supporting the broken nail guide rod is provided on the side of the pump body near the nail collection box.

[0014] Furthermore, the adapter plate is provided with a front guide ring for the broken nail guide tube to pass through, the inner diameter of the front guide ring being equal to the outer diameter of the buffer section. The support frame is provided with a rear guide ring for the broken nail guide tube to pass through, the inner diameter of the rear guide ring being equal to the outer diameter of the broken nail guide tube, and the outer diameter of the buffer section being larger than the outer diameter of the broken nail guide tube. The function of these front and rear guide rings is to fix the outer wall of the broken nail guide tube.

[0015] Furthermore, a protective sleeve is provided on the end face of the broken nail guide tube facing the nail collection box. Its function is to protect the end face of the broken nail guide tube inside the nail collection box.

[0016] The beneficial effects of this utility model are:

[0017] This utility model of an electric hydraulic riveting tool is equipped with an adapter plate, a receiving groove, and a shock-absorbing joint. When the riveting working head generates axial reciprocating vibration, the vibration is first transmitted to the shock-absorbing joint. The shock-absorbing joint performs axial reciprocating motion in the receiving groove, preventing the vibration of the shock-absorbing joint from being transmitted to the adapter plate. This prevents the adapter plate from being vibrated and transmitted to other components such as the pump body and motor, thereby extending the stability of the connection between the components in the riveting device and extending the overall service life of the riveting device.

[0018] By setting up the broken nail guide tube, broken nails can be discharged and collected during the riveting process. At the same time, the broken nail guide tube can position the adapter plate and the adapter plate can guide the broken nail guide tube.

[0019] The spatial relationship between the third and fourth oil ports and the axial oil passage facilitates the misalignment of the riveting head and the pump body, preventing the vibration of the riveting head from being directly transmitted to the pump body.

[0020] By setting the sealing groove, a sealing ring that is interference-fitted with the receiving groove can be placed in the sealing groove, thereby increasing the sealing effect on the front and rear sides of the axial oil passage. This ensures that the radial oil passage is always connected to the oil passage during the riveting process, and that the oil passage is always located between the two sealing rings in the receiving groove.

[0021] By using a design with buffer structures of different shapes spaced apart, the elastic ring can deform outward when subjected to compression, changing the vibration direction from axial to radial. The elastic pads provide some support for the elastic ring. By intermittently setting multiple elastic rings and elastic pads, a better shock absorption effect can be achieved while avoiding the need for large-diameter elastic rings that would occupy too much space. Attached Figure Description

[0022] Figure 1 A three-dimensional exploded view of an embodiment of the riveting tool;

[0023] Figure 2 This is a cross-sectional view of the riveting tool embodiment along the axis of the riveting head.

[0024] Figure 3 for Figure 2 A schematic cross-sectional view of point A in the middle;

[0025] Figure 4for Figure 3 A schematic cross-sectional view of the structure at point B in the middle;

[0026] Figure 5 for Figure 3 A schematic cross-sectional view of the structure at point C.

[0027] Figure 6 for Figure 2 Enlarged structural diagram at point D;

[0028] Figure 7 A three-dimensional structural diagram of the adapter plate for the riveting tool embodiment;

[0029] Figure 8 A cross-sectional view of the riveting tool adapter plate on the third oil passage axis, as shown in the embodiment of the riveting tool.

[0030] Figure 9 A three-dimensional structural diagram of the oil distribution plate in an embodiment of a riveting tool;

[0031] Figure 10 This is a three-dimensional structural diagram of the shock-absorbing joint in an embodiment of a riveting tool.

[0032] Reference numerals: 1. Riveting head; 2. Cylinder body; 3. Hollow piston shaft; 4. Rear end cover; 5. Hydraulic chamber; 6. First oil passage; 7. Second oil passage; 8. Third oil passage; 10. Broken nail guide tube; 11. Nail collection box; 12. Adapter plate; 13. First oil passage; 14. Second oil passage; 15. Receiving groove; 16. Vibration damping joint; 17. Axial oil passage; 18. Radial oil passage; 19. Third oil port; 20. Fourth oil port; 21. Oil distribution plate; 22. Limiting outer edge; 23. Limiting groove; 24. Sealing end; 25. Sealing groove; 26. Sealing plate; 27. Buffer section; 28. Annular groove; 29. ​​Elastic gasket; 30. Elastic ring; 31. Support frame; 32. Front guide ring; 33. Rear guide ring; 34. End face protective sleeve; 35. Pump body. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments. These specific embodiments are further explanations of the principle of the present invention and are not intended to limit the present invention in any way. Any technology that is the same as or similar to the present invention does not exceed the protection scope of the present invention.

[0034] Example

[0035] like Figure 1 As shown in the figure, this embodiment of an electro-hydraulic riveting tool includes a riveting head 1 and a pump body 35.

[0036] like Figure 2As shown, the riveting head 1 includes a cylinder body 2, a hollow piston shaft 3, and a rear end cover 4. The cylinder body 2 and the rear end cover 4 constitute a hydraulic chamber 5 for the movement of the hollow piston shaft 3, as shown. Figure 3 As shown, the cylinder body 2 is provided with a first oil passage 6 connected to the front end of the hydraulic chamber 5 and a second oil passage 7 connected to the rear end of the hydraulic chamber 5, as follows: Figure 4 , Figure 5 As shown, the pump body 35 is provided with a third oil passage 8 for connecting to the first oil passage 6 and a fourth oil passage 9 for connecting to the second oil passage 7. A broken nail guide tube 10 is connected to the riveting head 1. A nail collection box 11 is connected to the rear end of the broken nail guide tube 10. An adapter plate 12 is fitted onto the outer wall of the broken nail guide tube 10. An oil passage is provided within the adapter plate 12. The oil passage includes a first oil passage 13 for connecting the first oil passage 6 and the third oil passage 8, and a second oil passage 14 for connecting the second oil passage 7 and the fourth oil passage 9. The adapter plate 12 is provided with a connection to the oil passage. A receiving groove 15 is connected and parallel to the reciprocating motion direction of the riveting head 1. A shock-absorbing joint 16 is provided within the receiving groove 15. The shock-absorbing joint 16 has an axial oil passage 17 extending along the axial direction of the shock-absorbing joint 16 and a radial oil passage 18 extending radially along the axial direction of the shock-absorbing joint 16. The axial oil passage 17 and the radial oil passage 18 are connected. The axial oil passage 17 is connected to either the first oil passage 6 or the second oil passage 7. When the riveting head 1 is in the working state, the length of the shock-absorbing joint 16 within the receiving groove 15 is always less than the length of the receiving groove 15, and the radial oil passage 18 is always connected to the oil passage. The pump body 35, the oil cylinder, and the motor adopt common existing technologies and will not be described in detail. Its function is as follows: through the setting of the adapter plate 12, the receiving groove 15 and the shock-absorbing joint 16, when the riveting working head 1 generates axial reciprocating vibration, the vibration is transmitted to the shock-absorbing joint 16. The shock-absorbing joint 16 performs axial reciprocating motion in the receiving groove 15, avoiding the vibration of the shock-absorbing joint 16 from being transmitted to the adapter plate 12, thereby preventing the adapter plate 12 from being vibrated and transmitted to other components such as the pump body 35 and the motor, thus extending the stability of the connection of various components in the riveting device and extending the service life of the riveting device as a whole; through the setting of the broken nail guide tube 10, broken nails can be discharged and collected during the operation of the riveting working head 1, and at the same time, the broken nail guide tube 10 can position the adapter plate 12 and the adapter plate 12 can guide the broken nail guide tube 10.

[0037] like Figure 7 As shown, the first oil passage 13 includes a third oil port 19 for connecting to the third oil passage 8, the second oil passage 14 includes a fourth oil port 20 for connecting to the fourth oil passage 9, the axial oil passage 17 is located at the front end of the adapter plate 12, and the third oil port 19 and the fourth oil port 20 are located at the rear end of the adapter plate 12. Figure 8As shown, the distances between the third oil passage 19 and the fourth oil passage 20 and the plane containing the axes of the two axial oil passages 17 are both greater than zero. Their function is that, through the spatial relationship between the third oil passage 19 and the fourth oil passage 20 and the axial oil passages 17, it is convenient to misalign the riveting head 1 with the pump body 35, thus preventing the vibration of the riveting head 1 from being directly transmitted to the pump body 35.

[0038] like Figure 2 , Figure 9 As shown, the cylinder body 2 is sealed with an oil distribution plate 21. A limiting outer edge 22 is provided on the end face of the damping joint 16 facing the cylinder body 2. The opening of the axial oil passage 17 is located on the end face of the limiting outer edge 22. A limiting groove 23 for placing the limiting outer edge 22 is provided on the side of the oil distribution plate 21 facing away from the adapter plate 12. Its function is to fix the damping joint 16 between the oil distribution plate 21 and the cylinder body 2 through the setting of the limiting outer edge 22 and the limiting groove 23.

[0039] like Figure 10 As shown, the shock-absorbing joint 16 has a sealing end 24 at one end facing away from the limiting outer edge 22. The sealing end 24 is interference-fitted with the receiving groove 15, and a radial oil passage 18 is provided between the sealing end 24 and the limiting outer edge 22. Its function is to prevent liquid from overflowing from the receiving groove 15 by setting the sealing end 24 and designing the dimensional relationship between the sealing end 24 and the receiving groove 15.

[0040] like Figure 10 As shown, the radial oil passage 18 has an annular sealing groove 25 for placing a sealing ring on each of its front and rear sides along the axial direction of the shock-absorbing joint 16 at the opening on the side wall of the shock-absorbing joint 16. Sealing grooves 25 for placing sealing rings are provided between the radial oil passage 18 and the sealing end 24, and between the radial oil passage 18 and the limiting outer edge 22. The sealing ring is a common existing technology and will not be described in detail. Its function is that, through the setting of the sealing groove 25, a sealing ring that is interference-fitted with the receiving groove 15 can be placed in the sealing groove 25, thereby increasing the sealing effect on the front and rear sides of the axial oil passage 17. This ensures that during the operation of the riveting head 1, the radial oil passage 18 is always connected to the oil passage, and that the oil passage is always located between the two sealing rings in the receiving groove 15.

[0041] like Figure 2As shown, the broken nail guide tube 10 is coaxially arranged with the hollow piston shaft 3. The outer wall of the broken nail guide tube 10 is provided with a sealing plate 26 for sealing the rear end of the rear end cover 4. The broken nail guide tube 10 is provided with a buffer section 27 for fitting a buffer structure near the sealing plate 26. The end of the buffer section 27 away from the sealing plate 26 is provided with an annular groove 28 for embedding an annular retaining ring. When the adapter plate 12 is installed on the broken nail guide tube 10, the adapter plate 12 is located in the middle of the buffer section 27. Buffer structures are provided between the adapter plate 12 and the sealing plate 26 and between the adapter plate 12 and the annular groove 28. Its function is to buffer the riveting head 1 and the adapter plate 12 through the setting of the buffer structure. When the riveting head 1 vibrates back and forth, the broken nail guide tube 10 is driven to vibrate in the front and back direction. The front and back vibration of the broken nail guide tube 10 is buffered and eliminated by the buffer structure between the adapter plate 12 and the sealing plate 26 and the buffer structure between the annular retaining ring and the adapter plate 12, respectively.

[0042] like Figure 6 As shown, the buffer structure includes spaced elastic pads 29 and elastic rings 30. The elastic pads 29 have a rectangular cross-section, and the elastic rings 30 have a circular cross-section. Their function is that, by using buffer structures of different shapes spaced apart, the elastic rings 30 can deform outwards when subjected to compression, changing the vibration direction from axial to radial. The elastic pads 29 provide some support for the elastic rings 30. The intermittent arrangement of multiple elastic rings 30 and elastic pads 29 avoids the space-consuming effect of using large-diameter elastic rings 30 while achieving a better shock absorption effect.

[0043] like Figure 2 As shown, a support frame 31 for supporting the broken nail guide rod is provided on the side of the pump body 35 near the nail collection box 11.

[0044] like Figure 2 As shown, the adapter plate 12 is provided with a front guide ring 32 for the broken nail guide tube 10 to pass through. The inner diameter of the front guide ring 32 is equal to the outer diameter of the buffer section 27. The support frame 31 is provided with a rear guide ring 33 for the broken nail guide tube 10 to pass through. The inner diameter of the rear guide ring 33 is equal to the outer diameter of the broken nail guide tube 10, and the outer diameter of the buffer section 27 is larger than the outer diameter of the broken nail guide tube 10. Their function is to fix the outer wall of the broken nail guide tube 10 by setting the front guide ring 32 and the rear guide ring 33.

[0045] like Figure 2As shown, the broken nail guide tube 10 has an end face protection sleeve 34 on its end face facing the nail receiving box 11. The end face protection sleeve 34 is threaded to the end of the broken nail guide tube 10 and seals the end face of the broken nail guide tube 10. It is a hollow rotating body with an L-shaped cross-section. Its function is to protect the end face of the broken nail guide tube 10 inside the nail receiving box 11 through the provision of the end face protection sleeve 34.

[0046] The working principle of this embodiment is explained as follows: This embodiment is mainly powered by a battery, and the motor completes the conversion of electrical energy into mechanical energy. The motor drives the pump body to deliver pressurized oil to the working head. An oil tank is installed on the pump body to isolate the external environment from the hydraulic oil and to supply the required oil to the pump body. A pressure sensor and a reversing valve are installed on the main oil circuit of the pump body. The main controller controls the motor and the reversing valve according to the oil pressure feedback from the pressure sensor, pushing the piston of the working head to perform controlled reciprocating motion according to the riveting process requirements, thereby completing the riveting work. In order to improve the reliability and operating efficiency of the tool, the hydraulic system also includes a low-pressure bypass valve, a high-pressure safety valve, an oil tank pressure safety valve, and other structures. The tool has a display screen to display working parameters, and the parameters can be set through parameter setting buttons.

[0047] During the operation of the riveting head 1, the riveting head 1 generates axial vibration. Part of the vibration generated by the riveting head 1 is transmitted to the broken nail guide tube 10, and then from the broken nail guide tube 10 to the buffer structures at both ends of the adapter plate 12 for relief. The other part of the vibration generated by the riveting head 1 is transmitted to the vibration damping joint 16, causing the vibration damping joint 16 to vibrate back and forth with the riveting head 1. The vibration on the vibration damping joint 16 is not transmitted to the adapter plate 12, resulting in good vibration damping effect.

[0048] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present utility model and within the spirit and principles of the present utility model shall still fall within the protection scope of the present utility model.

[0049] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model 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 utility model.

[0050] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. An electro-hydraulic riveting tool, comprising a riveting head (1) and a pump body (35); the riveting head (1) comprises a cylinder (2), a hollow piston shaft (3), and a rear end cover (4), the cylinder (2) and the rear end cover (4) forming a hydraulic chamber (5) for the hollow piston shaft (3) to move, the cylinder (2) having a first oil passage (6) communicating with the front end of the hydraulic chamber (5) and a second oil passage (7) communicating with the rear end of the hydraulic chamber (5); the pump body (35) having a third oil passage (8) communicating with the first oil passage (6) and a fourth oil passage communicating with the second oil passage (7); characterized in that: The riveting head (1) is connected to a broken nail guide tube (10), and the rear end of the broken nail guide tube (10) is connected to a nail receiving box (11). An adapter plate (12) is fitted on the outer wall of the broken nail guide tube (10). An oil passage is provided in the adapter plate (12). The oil passage includes a first oil passage (13) for connecting the first oil passage (6) and the third oil passage (8) and a second oil passage (14) for connecting the second oil passage (7) and the fourth oil passage. A receiving groove (15) is provided in the adapter plate (12) that is connected to the oil passage and parallel to the reciprocating motion direction of the riveting head (1). The receiving groove (15) is provided with a shock-absorbing joint (16). The shock-absorbing joint (16) is provided with an axial oil passage (17) extending along the axial direction of the shock-absorbing joint (16) and a radial oil passage (18) extending along the radial direction of the shock-absorbing joint (16). The axial oil passage (17) and the radial oil passage (18) are connected. The axial oil passage (17) is connected to the first oil passage (6) or the second oil passage (7). When the riveting head (1) is in the working state, the length of the shock-absorbing joint (16) in the receiving groove (15) is always less than the length of the receiving groove (15) and the radial oil passage (18) is always connected to the oil passage.

2. The electro-hydraulic riveting tool according to claim 1, characterized in that: The first oil passage (13) includes a third oil port (19) for connecting with the third oil passage (8), the second oil passage (14) includes a fourth oil port (20) for connecting with the fourth oil passage, the axial oil passage (17) is located at the front end of the adapter plate (12), the third oil port (19) and the fourth oil port (20) are located at the rear end of the adapter plate (12), and the distance between the third oil port (19) and the fourth oil port (20) and the plane containing the axes of the two axial oil passages (17) is greater than zero.

3. The electro-hydraulic riveting tool according to claim 1, characterized in that: The cylinder body (2) is sealed with an oil distribution plate (21). The end face of the shock-absorbing joint (16) facing the cylinder body (2) is provided with a limiting outer edge (22). The opening of the axial oil passage (17) is located on the end face of the limiting outer edge (22). The oil distribution plate (21) is provided with a limiting groove (23) for placing the limiting outer edge (22) on the side facing away from the adapter plate (12).

4. The electro-hydraulic riveting tool according to claim 3, characterized in that: The shock-absorbing joint (16) has a sealing end (24) at one end facing away from the limiting outer edge (22). The sealing end (24) is interference-fitted with the receiving groove (15), and the radial oil passage (18) is located between the sealing end (24) and the limiting outer edge (22).

5. The electro-hydraulic riveting tool according to claim 1, characterized in that: The radial oil passage (18) has an annular sealing groove (25) on each of the front and rear sides along the axial direction of the shock absorber joint (16) at the opening on the side wall of the shock absorber joint (16).

6. The electro-hydraulic riveting tool according to claim 1, characterized in that: The broken nail guide tube (10) is coaxially arranged with the hollow piston shaft (3). The outer wall of the broken nail guide tube (10) is provided with a sealing plate (26) for sealing the rear end of the rear end cover (4). The broken nail guide tube (10) is provided with a buffer section (27) for fitting a buffer structure near the sealing plate (26). The end of the buffer section (27) away from the sealing plate (26) is provided with an annular groove (28) for embedding an annular retaining ring. When the adapter plate (12) is installed on the broken nail guide tube (10), the adapter plate (12) is located in the middle of the buffer section (27). Buffer structures are provided between the adapter plate (12) and the sealing plate (26) and between the adapter plate (12) and the annular groove (28).

7. The electro-hydraulic riveting tool according to claim 6, characterized in that: The buffer structure includes spaced elastic pads (29) and elastic rings (30), the elastic pads (29) have a rectangular cross-section, and the elastic rings (30) have a circular cross-section.

8. The electro-hydraulic riveting tool according to claim 6, characterized in that: The pump body (35) is provided with a support frame (31) on the side near the nail collection box (11) for supporting the broken nail guide rod.

9. The electro-hydraulic riveting tool according to claim 8, characterized in that: The adapter plate (12) is provided with a front guide ring (32) for the broken nail guide tube (10) to pass through. The inner diameter of the front guide ring (32) is equal to the outer diameter of the buffer section (27). The support frame (31) is provided with a rear guide ring (33) for the broken nail guide tube (10) to pass through. The inner diameter of the rear guide ring (33) is equal to the outer diameter of the broken nail guide tube (10). The outer diameter of the buffer section (27) is greater than the outer diameter of the broken nail guide tube (10).

10. The electro-hydraulic riveting tool according to claim 1, characterized in that: The broken nail guide tube (10) is provided with an end face protective sleeve (34) on the end face facing the nail receiving box (11).

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