An electrically powered rivet gun

Abstract

The application provides an electric pull-rivet gun, which comprises a shell, a lifting motor mounted on the shell, a lifting motor output shaft coaxially connected with a lead screw, the lead screw in threaded engagement with a screw sleeve, the screw sleeve fixed on a pull block, the pull block having a pull rod rotatably connected at the bottom end, the pull rod in transmission connection with a pull-rivet motor, the pull-rivet motor fixed on the pull block and arranged outside the shell, a barrel shell connected at the bottom end of the shell, a pull-rivet rod arranged inside the barrel shell and extending downward out of the barrel shell, a central shaft connected at the top end of the pull-rivet rod, the central shaft sleeved at the bottom end of the pull rod, and a spring arranged between the bottom end of the pull rod and the central shaft. In the application, a buffer structure is arranged between the pull anchor rod and the pull rod, and the force is absorbed by the spring in the buffer structure after the pull anchor rod contacts with the pull-rivet nut, so that the rigid contact between the pull anchor rod and the pull rod is converted into flexible contact, the problem of damage caused by rigid contact is avoided, and the service life of the pull-rivet gun is increased.

Description

Technical Field

[0001] This invention belongs to the field of rivet gun technology, and specifically relates to an electric rivet gun. Background Technology

[0002] If a product's nut needs to be installed on the outside, but the internal space is too small for the press head of the riveting machine to enter for riveting, and methods such as pressing and pulling cannot achieve the required strength, then press riveting and expansion riveting are not feasible, and pull riveting must be used. Pull riveting is suitable for fastening plates and pipes of various thicknesses. Using a pneumatic or manual pull riveting gun, it can rivet in one go, which is convenient and secure. It replaces traditional welded nuts and makes up for the shortcomings of easy melting when welding thin metal plates and thin pipes and the irregularity of welded nuts.

[0003] The existing riveting gun works by rotating the threaded rod and pressing the rivet nut with the gun head, thus riveting the rivet nut onto the sheet metal or pipe. Although it can complete the riveting operation, the rivet nut needs to be inserted into the hole first, which reduces the efficiency of the entire riveting process. Furthermore, the force used to pull the rivet nut is directly transmitted to the internal structure of the riveting gun through the threaded rod, which can easily damage the rivet gun.

[0004] How to design an electric rivet gun and how to increase its service life are urgent problems to be solved. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide an electric rivet gun to solve the problem of easy damage of rivet guns in the prior art.

[0006] To achieve the above objectives, the present invention provides an electric rivet gun, comprising a housing, a lifting motor mounted on the housing, an output shaft of the lifting motor coaxially connected to a lead screw disposed inside the housing, the lead screw being threadedly engaged with a threaded sleeve, the threaded sleeve being fixed on a pull block, a pull rod being rotatably connected to the bottom end of the pull block, the pull rod being drively connected to a rivet motor, and the rivet motor being fixed to the pull block and disposed outside the housing;

[0007] The bottom end of the housing is connected to a cylindrical shell, and a rivet rod is provided inside the cylindrical shell, extending downward through the cylindrical shell. The top end of the rivet rod is connected to a central shaft, and the top end of the central shaft is sleeved on the bottom end of the rivet rod. A spring is pressed between the bottom end of the rivet rod and the central shaft.

[0008] A hexagonal rod is fixed inside the central shaft. The top of the hexagonal rod passes through a spring and is sleeved on the bottom of the pull rod. A limit rod is provided inside the bottom of the pull rod. The limit rod is matched with a strip-shaped limit hole opened at the top of the hexagonal rod.

[0009] This technical solution involves adding a lifting motor to the existing rivet gun to enable the retractable anchor rod, accommodating rivets of different lengths. The tightening rivet is changed to a direct-up rivet, separating the rivet of the anchor nut and the assembly / disassembly of the anchor rod into two independent operations. These operations work together to complete the rivet process while reducing the rotation frequency of the anchor rod during a single rivet operation, thus reducing the anchor rod's wear rate and increasing its service life. A central shaft, hexagonal rod, spring, limit rod, and strip-shaped limit hole are installed between the tie rod and the anchor rod, directly connected by the rivet motor. These structures form a buffer mechanism that ensures normal transmission between the tie rod and the anchor rod while converting the rigid contact between them into a flexible contact through the spring. This prevents the collision force between the anchor rod and the rivet nut from being directly transmitted to the tie rod, thus avoiding damage. This increases the safety and service life of the rivet gun and allows for stable operation during automated rivet processes.

[0010] In one embodiment of the present invention, the output shaft of the lifting motor is coaxially fixed to the top end of the lead screw via a coupling. The lead screw is rotatably mounted on a horizontal plate fixed inside the housing. A limit post is connected to the bottom end of the horizontal plate, and the limit post is located above the pull block.

[0011] By adopting this technical solution, the position of the lead screw is fixed by installing a horizontal plate inside the housing, thereby increasing the stability of the lead screw during rotation. At the same time, a limiting post is connected to limit the rise of the pull block, preventing the pull block from rising beyond the control range of the rivet gun itself, thus ensuring the reliability of the rivet gun's operation.

[0012] In one embodiment of the present invention, a limit sensor corresponding to the position of the bottom end of the limit post is installed on the housing.

[0013] By adopting this technical solution, the bottom of the limit post is monitored by a limit sensor. When the pull block moves upward to the bottom of the limit post, the limit sensor can send a signal to stop the pull block from rising further, thus ensuring the reliability and automation of the operation.

[0014] In one embodiment of the present invention, a detection plate protruding from the interior of the housing is installed on the pull block. The detection plate cooperates with a displacement sensor installed on the housing, and the displacement sensor is electrically connected to a displacement controller installed on the housing.

[0015] By adopting this technical solution, which involves adding displacement sensors to monitor the movement distance of the pull block, automated and precise displacement control can be achieved.

[0016] In one embodiment of the present invention, guide sleeves are provided on both sides of the pull block, the guide sleeves are slidably disposed on the guide post, and the guide post is fixed on the inner bottom wall of the housing.

[0017] By adopting this technical solution, the guide sleeve and guide post are used to guide the pull block, ensuring that the pull block will not rotate with the rotation of the lead screw.

[0018] In one embodiment of the present invention, a bearing mounting seat is installed on the inner bottom wall of the pull block, and a first bearing is fixed inside the bearing mounting seat and the pull rod is rotatably connected to the bottom end of the pull block through the first bearing.

[0019] By adopting this technical solution: the first bearing is a rotating connecting part, and the rotational connection between the pull rod and the pull block is realized through the first bearing.

[0020] In one embodiment of the present invention, the pull rod is connected to the output shaft of the riveting motor via a transmission belt, the riveting motor is fixed on the mounting base, and the mounting base extends into the interior of the housing and is fixed to the pull block.

[0021] By adopting this technical solution, the output shaft of the rivet motor is connected to the pull rod drive, while the rivet motor is placed outside the housing, maximizing the utilization of the internal space of the housing, making the structure compact, and reducing the maintenance difficulty of the rivet motor.

[0022] In one embodiment of the present invention, the cylindrical shell includes an outer sleeve shaft, an outer nut, and a front head connected sequentially from top to bottom, wherein the outer sleeve shaft is connected to the bottom end of the shell by a pressure cap, the outer nut is sleeved on the bottom end of the outer sleeve shaft, and the front head is connected to the bottom end of the outer nut.

[0023] By adopting this technical solution, the shell is divided into three sections, which facilitates the disassembly and assembly of the shell itself, thereby making it easier to maintain the internal structure of the shell in the later stages.

[0024] In one embodiment of the present invention, the central shaft is rotatably connected to the inside of the outer shaft via a second bearing. A fixing block is fixed on the central shaft, extending through the inside of the outer shaft. A rod is fixed on the fixing block. The rod cooperates with a positioning sensor. The positioning sensor is fixed on a blocking block, and the blocking block is fixed on the outer shaft.

[0025] By adopting this technical solution: the central shaft is fixed to the anchor rod. When the anchor rod contacts the rivet nut, it will push the central shaft to move upward. The rod connected to the fixed block on the central shaft will move towards the positioning sensor installed on the block on the outer shaft until the rod contacts the positioning sensor. Then the positioning sensor will send a signal to the controller, which will control the rivet motor to start, thereby driving the anchor rod to rotate through the transmission action. This avoids direct rigid contact between the anchor rod and the tie rod, completely avoiding the problem of collision damage and increasing the service life of the rivet gun.

[0026] In one embodiment of the present invention, a pressure sensor is provided between the top end of the central shaft and the bottom end of the housing, and the outer shaft is electrically connected to a pressure amplifier mounted on the housing.

[0027] By adopting this technical solution, as the central shaft moves upward under the action of the anchor rod, it will squeeze the pressure sensor, thereby detecting the pressure level and avoiding the problem of excessive pressure leading to structural damage.

[0028] As described above, the electric rivet gun of the present invention has the following beneficial effects: a buffer structure is provided between the anchor rod and the pull rod that drives the anchor rod to rotate. After the anchor rod contacts the rivet nut, the force is absorbed by the spring in the buffer structure, thereby converting the rigid contact between the anchor rod and the pull rod into a flexible contact, avoiding the problem of rigid contact damage, and thus increasing the service life of the rivet gun; a lifting motor is provided to control the extension and retraction of the anchor rod to provide rivet force, and to increase the adaptability of the anchor rod to different rivet nuts, reduce the rotation frequency of the anchor rod, thereby reducing the rotational wear of the anchor rod and increasing its service life; the whole is electric and has a compact structure, which can be used in automated riveting production lines and has good application prospects; its widespread application has good economic and social benefits. Attached Figure Description

[0029] Figure 1 This is a perspective view of the present invention.

[0030] Figure 2 This is a top view of the present invention.

[0031] Figure 3 yes Figure 2 Sectional view along line AA.

[0032] Figure 4 yes Figure 3 Enlarged view of a portion of the image.

[0033] Figure 5 This is a rear view of the present invention.

[0034] Figure 6 yes Figure 5 Sectional view along the BB direction.

[0035] Figure 7 yes Figure 6 Enlarged view of a portion of the image.

[0036] In the diagram: 1. Housing; 2. Lifting motor; 3. Coupling; 4. Lead screw; 5. Screw sleeve; 6. Pull block; 7. Guide post; 71. Outer shaft; 8. Pull rod; 81. First bearing; 82. Bearing mounting seat; 9. Pressure sensor; 10. Riveting motor; 11. Transmission belt; 12. Central shaft; 13. Hexagonal rod; 14. Strip-shaped limiting hole; 15. Limiting rod; 16. Spring; 17. Riveting rod; 18. Outer shaft; 19. Outer nut; 20. Pressure cap; 21. Fixing block; 22. Rod body; 23. Position sensor; 24. Block; 25. Front head; 26. Horizontal plate; 27. Limiting post; 28. Displacement sensor; 29. ​​Pressure amplifier; 30. Limiting sensor; 31. Displacement controller; 32. Second bearing. Detailed Implementation

[0037] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0038] Please see Figure 1-7 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0039] Please see Figure 1-7An electric rivet gun includes a housing 1, on which a lifting motor 2 is mounted. The output shaft of the lifting motor 2 is coaxially connected to a lead screw 4 disposed inside the housing 1. The lead screw 4 is threadedly engaged with a threaded sleeve 5, which is fixed to a pull block 6. A pull rod 8 is rotatably connected to the bottom end of the pull block 6. The pull rod 8 is drivenly connected to a rivet motor 10, which is fixed to the pull block 6 and disposed outside the housing 1. A cylindrical shell is connected to the bottom end of the housing 1. A rivet rod 17 is disposed inside the cylindrical shell and extends downward through the interior of the cylindrical shell. A central shaft 12 is connected to the top end, and the top end of the central shaft 12 is sleeved on the bottom end of the pull rod 8. A spring 16 is pressed between the bottom end of the pull rod 8 and the central shaft 12. A hexagonal rod 13 is fixed inside the central shaft 12. The top end of the hexagonal rod 13 passes through the spring 16 and is sleeved on the bottom end of the pull rod 8. A limit rod 15 is provided inside the bottom end of the pull rod 8. The limit rod 15 is matched with the strip-shaped limit hole 14 opened at the top end of the hexagonal rod 13. By adopting this technical solution, an anchor rod can be pulled by adding a lifting motor 2 on the basis of the existing rivet gun. The telescopic design of the anchor rod 17 allows it to accommodate rivet nuts of different lengths. It also transforms the tightening rivet process into a straight-up rivet, separating the rivet assembly and disassembly of the anchor rod 17 into two independent operations. These operations work together to complete the rivet process while reducing the rotation frequency of the anchor rod 17 during a single rivet operation, thus reducing the wear rate and increasing its service life. A central shaft 12, hexagonal rod 13, spring 16, limit rod 15, and strip-shaped limit hole 14 are installed between the pull rod 8 (directly connected to the rivet motor 10) and the anchor rod 17. These structures work together to form a buffer mechanism. While ensuring normal transmission between the pull rod 18 and the anchor rod 17, the spring 16 converts the rigid contact between the anchor rod 17 and the pull rod 8 into a flexible contact. This prevents the collision force between the anchor rod 17 and the rivet nut from being directly transmitted to the pull rod 8, thus avoiding damage. This increases the safety and service life of the rivet gun and allows it to maintain stable operation during automated rivet processes.

[0040] Furthermore, the output shaft of the lifting motor 2 is coaxially fixed to the top of the lead screw 4 via a coupling 3. The lead screw 4 is rotatably mounted on a horizontal plate 26 fixed inside the housing 1. The bottom end of the horizontal plate 26 is connected to a limit post 27, which is located above the pull block 6. By adopting this technical solution, the position of the lead screw 4 is fixed by installing the horizontal plate 26 inside the housing 1, thereby increasing the stability of the lead screw 4 during rotation. At the same time, the limit post 27 is connected to limit the rise of the pull block 6, preventing the rise of the pull block 6 from exceeding the control range of the rivet gun itself, and ensuring the operational reliability of the rivet gun.

[0041] Furthermore, a limit sensor 30 corresponding to the bottom position of the limit post 27 is installed on the housing 1. By adopting this technical solution, the bottom of the limit post 27 is monitored by the limit sensor 30. When the pull block 6 moves upward to the bottom of the limit post 27, a signal can be sent through the limit sensor 30 to stop the pull block 6 from continuing to rise, thus ensuring the reliability and automation of the operation.

[0042] Furthermore, a detection plate protruding from the interior of the housing 1 is installed on the pull block 6. The detection plate cooperates with the displacement sensor 28 installed on the housing 1. The displacement sensor 28 is electrically connected to the displacement controller 31 installed on the housing 1. By adopting this technical solution, the movement distance of the pull block 6 is monitored by adding the displacement sensor 28, thereby realizing automated and precise displacement control.

[0043] Furthermore, guide sleeves 71 are provided on both sides of the pull block 6. The guide sleeves 71 are slidably mounted on the guide post 7, and the guide post 7 is fixed on the inner bottom wall of the housing 1. By adopting this technical solution, the pull block 6 is guided by the cooperation between the guide sleeves 71 and the guide post 7, ensuring that the pull block 6 will not rotate with the rotation of the lead screw 4.

[0044] Furthermore, a bearing mounting seat 82 is installed on the inner bottom wall of the pull block 6. A first bearing 81 is fixed inside the bearing mounting seat 82, and the pull rod 8 is rotatably connected to the bottom end of the pull block 6 through the first bearing 81. By adopting this technical solution, the first bearing 81 is a rotatable connecting part, and the rotatable connection between the pull rod 8 and the pull block 6 is realized through the first bearing 81.

[0045] Furthermore, the pull rod 8 is connected to the output shaft of the rivet motor 10 via the transmission belt 11. The rivet motor 10 is fixed on the mounting base, which extends into the interior of the housing 1 and is fixed to the pull block 6. By adopting this technical solution, the output shaft of the rivet motor 10 is connected to the pull rod 8, while the rivet motor 10 is placed outside the housing 1, maximizing the utilization of the internal space of the housing 1. This results in a compact structure and reduces the maintenance difficulty of the rivet motor 10.

[0046] Furthermore, the cylindrical shell includes an outer sleeve shaft 18, an outer nut 19, and a front head 25 connected sequentially from top to bottom. The outer sleeve shaft 18 is connected to the bottom end of the housing 1 via a pressure cap 20, the outer nut 19 is fitted onto the bottom end of the outer sleeve shaft 18, and the front head 25 is connected to the bottom end of the outer nut 19. By adopting this technical solution, the cylindrical shell is divided into three sections, which facilitates the disassembly and assembly of the cylindrical shell itself, thereby facilitating the maintenance of the internal structure of the cylindrical shell in the later stages.

[0047] Furthermore, the central shaft 12 is rotatably connected to the inside of the outer shaft 18 via the second bearing 32. A fixing block 21 extending through the inside of the outer shaft 18 is fixed on the central shaft 12. A rod 22 is fixed on the fixing block 21. The rod 22 cooperates with the positioning sensor 23. The positioning sensor 23 is fixed on the blocking block 24, which is fixed on the outer shaft 18. By adopting this technical solution, the central shaft 12 is fixed to the anchor rod 17. When the anchor rod 17 contacts the rivet nut, it will push the central shaft 12 to move upward. The rod 22 connected to the fixing block 21 on the central shaft 12 will move towards the positioning sensor 23 installed on the blocking block 24 on the outer shaft 18 until the rod 22 contacts the positioning sensor 23. Then, the positioning sensor 23 will send a signal to the controller, which will control the rivet motor 10 to start, thereby driving the anchor rod 17 to rotate through the transmission action. This avoids direct rigid contact between the anchor rod 17 and the tie rod 18, completely avoiding the problem of collision damage and increasing the service life of the rivet gun.

[0048] Furthermore, a pressure sensor 9 is installed between the top end of the central shaft 12 and the bottom end of the housing 1, and the outer shaft 18 is electrically connected to a pressure amplifier 29 mounted on the housing 1. By adopting this technical solution, as the central shaft 12 moves upward under the action of the anchor rod 17, it will squeeze the pressure sensor 9, thereby detecting the pressure level and avoiding the problem of excessive pressure leading to structural damage.

[0049] In practice, before the riveting operation, the rivet gun is connected to the robotic arm. The robotic arm controls the rivet gun to move to the position of the rivet nut. Then, the lifting motor 2 is started, which drives the lead screw 4 to rotate inside the screw sleeve 5. Through the cooperation between the screw sleeve 5 and the lead screw 4, the rotational force is converted into a downward force, thereby driving the pull block 6 connected to the screw sleeve 5 to move downward, which in turn pushes the internal pull rod 8 to move downward. This allows the bottom center shaft 12 and the anchor rod 17 connected to the lower end of the center shaft 12 to move downward and contact the rivet nut. Then, the rivet motor 10 is started. The rivet motor 10 drives the pull rod 8, the center shaft 12, and the anchor rod 17 connected to the lower end of the center shaft 12 to rotate and screw into the inside of the rivet nut, so that the top of the rivet nut abuts against the bottom of the rivet gun, completing the preparation work.

[0050] During the riveting operation, the robotic arm carries the rivet gun and the rivet nut connected to the rivet gun to the riveting position and inserts the rivet nut into the rivet hole. Then, the lifting motor 2 is started, and the anchor rod 17 is pulled up according to the above principle, thereby driving the threaded part of the rivet nut to move up and squeeze the part between the rivet nut and the bottom end of the rivet gun, thus completing the riveting. After the riveting is completed, the riveting motor 10 is started, and the riveting motor 10 drives the pull rod 8, the central shaft 12 and the anchor rod 17 connected to the lower end of the central shaft 12 to rotate, so that the anchor rod 17 is unscrewed from the inside of the rivet nut, realizing the separation between the rivet gun and the rivet nut, and completing the riveting process of one rivet nut.

[0051] In summary, the electric rivet gun of the present invention has the following beneficial effects: A buffer structure is provided between the anchor rod 17 and the pull rod 8 that drives the anchor rod 17 to rotate. After the anchor rod 17 contacts the rivet nut, the force is absorbed by the spring 16 in the buffer structure, thereby converting the rigid contact between the anchor rod 17 and the pull rod 8 into a flexible contact, avoiding damage to the rigid contact and increasing the service life of the rivet gun; a lifting motor 2 is provided to control the extension and retraction of the anchor rod 17 to provide rivet force, increasing the adaptability of the anchor rod 17 to different rivet nuts, reducing the rotation frequency of the anchor rod 17, thereby reducing the rotational wear of the anchor rod 17 and increasing its service life; its widespread application has good economic and social benefits. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial utilization value.

[0052] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An electrically powered rivet gun comprising a housing (1), characterised in that: The shell (1) is provided with a lifting motor (2), the output shaft of the lifting motor (2) is coaxially connected with a lead screw (4) arranged inside the shell (1), the lead screw (4) is threadedly connected with a screw sleeve (5), the screw sleeve (5) is fixed on a pulling block (6), the pulling block (6) is rotatably connected with a pulling rod (8) at the bottom end, the pulling rod (8) is drivingly connected with a pull rivet motor (10), the pull rivet motor (10) is fixed on the pulling block (6) and arranged outside the shell (1); The bottom end of the shell (1) is connected with a barrel shell, the barrel shell is provided with a pull rivet rod (17) penetrating into the barrel shell, the top end of the pull rivet rod (17) is connected with a central shaft (12), the bottom end of the pull rivet rod (8) is sleeved on the central shaft (12), and the spring (16) is arranged between the bottom end of the pull rivet rod (8) and the central shaft (12). The central shaft (12) is fixedly provided with a hexagonal rod (13), the top end of the hexagonal rod (13) penetrates through the spring (16) and is sleeved on the bottom end of the pull rivet rod (8), the bottom end of the pull rivet rod (8) is provided with a limiting rod (15), and the limiting rod (15) is limitedly connected with a strip-shaped limiting hole (14) arranged at the top end of the hexagonal rod (13). The output shaft of the lifting motor (2) is coaxially fixed with the top end of the lead screw (4) through a shaft coupling (3), the lead screw (4) is rotatably arranged on a horizontal plate (26) fixed inside the shell (1), the bottom end of the horizontal plate (26) is connected with a limiting column (27), and the limiting column (27) is located above the pulling block (6). The shell (1) is provided with a limiting sensor (30) corresponding to the bottom end position of the limiting column (27). The pulling block (6) is provided with a detection plate penetrating into the shell (1), the detection plate is matched with a displacement sensor (28) arranged on the shell (1), and the displacement sensor (28) is electrically connected with a displacement controller (31) arranged on the shell (1).

2. The electric powered pull rivet gun of claim 1, wherein: The pulling block (6) is provided with a guide sleeve (71) on both sides, the guide sleeve (71) is slidingly arranged on a guide column (7), and the guide column (7) is fixed on the inner bottom wall of the shell (1).

3. The electrically powered pull rivet gun of claim 1, wherein: A bearing mounting seat (82) is arranged on the inner bottom wall of the pulling block (6), a first bearing (81) is fixed in the bearing mounting seat (82), and the pulling rod (8) is rotatably connected to the bottom end of the pulling block (6) through the first bearing (81).

4. The electric powered pull riv gun of claim 1, wherein: The pulling rod (8) is drivingly connected with the output shaft of the pull rivet motor (10) through a transmission belt (11), the pull rivet motor (10) is fixed on a mounting seat, the mounting seat penetrates into the shell (1) and is fixed with the pulling block (6).

5. The electric powered pull riv gun of claim 1, wherein: The barrel shell comprises an outer sleeve shaft (18), an outer screw cap (19) and a front head (25) connected in sequence from top to bottom, wherein the outer sleeve shaft (18) is connected to the bottom end of the shell (1) through a gland (20), the outer screw cap (19) is sleeved on the bottom end of the outer sleeve shaft (18), and the front head (25) is connected to the bottom end of the outer screw cap (19).

6. An electrically powered pull rivet gun according to claim 5 wherein: The center shaft (12) is rotatably connected inside the outer sleeve shaft (18) through a second bearing (32), a fixed block (21) penetrating the inside of the outer sleeve shaft (18) is fixed on the center shaft (12), a rod body (22) is fixed on the fixed block (21), the rod body (22) cooperates with a position sensor (23), the position sensor (23) is fixed on a plug block (24), and the plug block (24) is fixed on the outer sleeve shaft (18).

7. An electrically powered pull rivet gun according to claim 6 wherein: A pressure sensor (9) is arranged between the top end of the center shaft (12) and the bottom end of the shell (1), and the outer sleeve shaft (18) is electrically connected with a pressure amplifier (29) mounted on the shell (1).

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