Bolt screwing tool

Abstract

The invention discloses a bolt screwing tool. The bolt screwing tool comprises a rack. The supporting column is vertically fixed on the rack; the mounting seat is arranged at the bottom of the rack and is provided with a positioning groove for mounting the steering gear; the lifting mechanism comprises a first piston driving piece and a connecting rope, the first piston driving piece is installed on the top of the rack, and one end of the connecting rope is connected with the first piston driving piece; the rotating mechanism comprises a rotating motor, a screwing rod, a connecting assembly and a transmission assembly; the output end of the rotating motor is coaxially connected with a screwing rod, and the screwing rod is provided with a locking hole used for being matched with a bolt. Through linkage control of the lifting mechanism and the rotating mechanism, automatic alignment and clamping of the bolt and the steering gear output shaft and precise locking with controllable torque are achieved, traditional manual tightening operation is replaced, and the problems that alignment is difficult, torque is uneven, and efficiency is low in the assembling process are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of steering gear assembly equipment, and particularly relates to a bolt tightening tooling. Background Art

[0002] As a core component of an automotive steering system, the performance and reliability of a recirculating ball power steering gear are directly related to the vehicle's handling safety and service life. This steering gear mainly consists of three major assemblies: a housing assembly, a bolt and valve assembly, and an arm shaft side cover assembly. The assembly accuracy and adjustment process between the three major assemblies have a decisive impact on the overall performance of the steering gear, especially the control of the pre-tightening force of the connecting bolts between the housing and the valve body, and between the housing and the side cover. During the assembly process, the bolts need to be tightened by screwing to ensure that all components are closely fitted and load is transmitted. However, in the actual production process, due to problems such as insufficient bolt tightening torque, positioning deviation of the assembly tooling, or cumulative dimensional errors of the components, the bolts often fail to fully compress the components, resulting in contact surface gaps, uneven stress distribution, and even local loosening. Such assembly defects not only cause faults such as steering noise and vibration, but may also lead to fatigue fracture of the bolts due to long-term uneven stress, seriously threatening driving safety. Summary of the Invention

[0003] In view of the above technical problems, the present invention proposes a bolt tightening tooling, which realizes the automatic alignment, clamping, and precisely controlled torque locking of the bolt and the steering gear output shaft through the linkage control of a lifting mechanism and a rotating mechanism, replaces the traditional manual tightening operation, and solves the problems of difficult alignment, uneven torque, and low efficiency during the assembly process.

[0004] The technical solution adopted by the present invention is as follows: A bolt tightening tooling, comprising: a frame; a pillar vertically fixed on the frame; a mounting seat provided at the bottom of the frame and having a positioning groove for mounting the steering gear; a lifting mechanism including a first piston driving member and a connecting rope, the first piston driving member being installed at the top of the frame, and one end of the connecting rope being connected to the first piston driving member; the rotating mechanism includes a rotating motor, a screwing rod, a connecting component, and a transmission component; the output end of the rotating motor is coaxially connected to the screwing rod, and the screwing rod is provided with a locking hole for mating with the bolt; one end of the connecting component is connected to the screwing rod, and the other end of the connecting component is connected to the transmission component; the transmission component is rotatably sleeved on the outer peripheral wall of the pillar, and the transmission component moves axially along the pillar, and the other end of the connecting rope is connected to the transmission component, so that the first piston driving member drives the transmission component to move axially along the pillar through the connecting rope, driving the screwing rod to lift.

[0005] Optionally, the transmission assembly includes a first connecting member, a second connecting member, a third connecting member, a bearing, and a rotating cylinder. The first connecting member, the second connecting member, and the third connecting member are fixedly connected in sequence from top to bottom. The inner ring of the bearing is tightly sleeved on the outer peripheral wall of the third connecting member, and the rotating cylinder is tightly sleeved on the outer ring of the bearing. The rotating cylinder is fixedly connected to the connecting assembly. The first connecting member is provided with a rope hook for connecting with a connecting rope. The support column is provided with a chute along the axial direction, and the inner peripheral wall of the second connecting member is provided with a slider that matches the chute.

[0006] Optionally, the first connecting member includes a first connecting ring and a connecting plate extending radially from the first connecting ring. The connecting plate is provided with the rope hook. The second connecting member includes a second connecting ring and a convex block arranged circumferentially along the second connecting ring. The third connecting member includes a third connecting ring and a bushing coaxially arranged with the third connecting ring. The diameter of the third connecting ring is larger than that of the bushing. The first connecting ring and the second connecting ring are connected by screws, and the convex block and the third connecting ring are connected by screws. The bearing is sleeved on the outer peripheral wall of the bushing.

[0007] Optionally, the rotating cylinder includes a first rotating part and a second rotating part coaxially connected to the first rotating part. The outer ring of the bearing abuts against the inner peripheral wall of the second rotating part. The first rotating part is sleeved on the outer peripheral wall of the second connecting ring. The diameter of the first rotating part is larger than that of the second connecting ring, and the convex block protrudes from the outer diameter wall of the first rotating part.

[0008] Optionally, the first rotating part is provided with a convex ring along the circumferential direction. The number of the convex blocks is multiple, and the multiple convex blocks are evenly spaced along the circumferential direction of the second connecting ring. The edge of the convex ring protrudes from the convex block, and the edge of the convex ring and the second rotating part are connected by screws.

[0009] Optionally, the connecting assembly includes a first connecting plate and a second connecting plate. The first connecting plate is fixedly connected to one side of the outer wall of the rotating cylinder. One end of the second connecting plate is fixedly connected to the first connecting plate. The end of the second connecting plate far from the first connecting plate is provided with a first support plate and a second support plate. The first support plate and the second support plate are arranged at an angle. The first support plate is provided with a first handle, and the second support plate is provided with a second handle.

[0010] Optionally, the first handle is provided with a first touch key, and the second handle is provided with a second touch key. The tightening rod is provided with a torque sensor for real-time detecting the torque value when the bolt is tightened. The frame is installed with a controller. The first touch key, the second touch key, the torque sensor, the rotating motor, and the first piston driving member are respectively electrically connected to the controller.

[0011] Optionally, anti-slip grooves are provided on the inner wall of the locking hole of the screw rod. The anti-slip grooves match the outer contour of the bolt. The positioning groove of the mounting seat corresponds coaxially to the locking hole of the screw rod, and the axis of the screw rod coincides with the axis of the output shaft of the steering gear.

[0012] Optionally, it further includes a pressing component. The pressing component includes a second piston driver, a bracket, and a pressing plate. The output end of the second piston driver is connected to one end of the pressing plate, and the other end of the pressing plate extends above the mounting seat. One end of the bracket is mounted on the frame, and the other end of the bracket is rotatably connected between both ends of the pressing plate.

[0013] Optionally, the pressing plate is provided with a first card slot and a second card slot. The second piston driver is rotationally matched with the first card slot through a first rotating shaft. A clamping protrusion is provided at one end of the bracket away from the frame, and the clamping protrusion is rotationally matched with the second card slot through a second rotating shaft.

[0014] The beneficial effects of the present invention are as follows: (1) During use, first install the input shaft of the steering gear into the positioning groove of the mounting seat, install the bolt into the assembly hole of the output shaft of the steering gear, rotate the transmission component to make the screw rod correspond to the bolt, the first piston driver drives the connecting rope to descend, and the connecting rope drives the screw rod to descend through the transmission component and the connecting component until the locking hole on the screw rod clamps the bolt. The rotating motor drives the screw rod to rotate, screws the bolt onto the output shaft. After that, the first piston driver drives the connecting rope to drive the rotating column to move upward, and the screw rod is separated from the bolt. The operator removes the steering gear for the next operation. The bolt tightening tooling in this embodiment realizes the automatic alignment, clamping, and precisely controlled torque locking of the bolt and the output shaft of the steering gear through the linkage control of the lifting mechanism and the rotating mechanism; the flexible cooperation between the connecting rope and the transmission component enables the screw rod to have a high adaptability, can be compatible with the assembly requirements of steering gears of different sizes, significantly improves the efficiency and consistency of batch production, replaces the traditional manual tightening operation, and solves problems such as difficult alignment, uneven torque, and low efficiency during the assembly process;

[0015] (2) The first rotating part is fixedly connected to the second rotating part through a convex ring. The edge of the convex ring covers the convex block and is fixed by screws, forming a closed protection for the bearing to prevent foreign objects from invading; the split connection between the first rotating part and the second rotating part facilitates the maintenance of the bearing. The first connecting piece and the second connecting piece clamp the first rotating part in the middle, and through the clamping design, it is ensured that the rotating cylinder and the connecting piece move synchronously when the transmission component moves up and down, eliminating the transmission delay. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the bolt tightening tooling proposed in the embodiment of the present invention;

[0017] Figure 2Schematic diagram of the lifting mechanism and the rotating mechanism of the bolt tightening tooling proposed in the embodiment of the present invention;

[0018] Figure 3 Exploded view of the transmission assembly of the bolt tightening tooling proposed in the embodiment of the present invention;

[0019] Figure 4 Schematic diagram of the first rotating part of the bolt tightening tooling proposed in the embodiment of the present invention being arranged between the first connecting piece and the second connecting piece;

[0020] Figure 5 Schematic diagram of the pressing assembly of the bolt tightening tooling proposed in the embodiment of the present invention.

[0021] The reference signs in each drawing are: 1, frame; 2, support pillar; 3, mounting seat; 4, positioning groove; 5, first piston driving member; 6, connecting rope; 7, rotating motor; 8, screwing rod; 9, first connecting piece; 10, second connecting piece; 11, third connecting piece; 12, bearing; 13, rotating cylinder; 14, sliding groove; 15, sliding block; 16, first connecting ring; 17, connecting plate; 18, rope hook; 19, second connecting ring; 20, convex block; 21, third connecting ring; 22, bushing; 23, first rotating part; 24, second rotating part; 25, convex ring; 26, first connecting plate; 27, second connecting plate; 28, first support plate; 29, second support plate; 30, first handle; 31, second handle; 32, torque sensor; 33, controller; 34, second piston driving member; 35, bracket; 36, pressing plate; 37, first clamping groove; 38, second clamping groove; 39, first rotating shaft; 40, second rotating shaft; 41, clamping projection. Detailed implementation manners

[0022] The following further elaborates on the present application in conjunction with the drawings and embodiments.

[0023] As Figures 1 to 5As shown in the figure, this embodiment discloses a bolt tightening tooling, which includes: a frame 1; a support column 2 vertically fixed on the frame 1; a mounting seat 3 provided at the bottom of the frame 1 and provided with a positioning groove 4 for mounting a steering gear; a lifting mechanism, including a first piston driving member 5 and a connecting rope 6, the first piston driving member 5 is installed on the top of the frame 1, and one end of the connecting rope 6 is connected to the first piston driving member 5; the rotating mechanism includes a rotating motor 7, a screwing rod 8, a connecting component and a transmission component; the output end of the rotating motor 7 is coaxially connected to the screwing rod 8, and the screwing rod 8 is provided with a locking hole for cooperating with the bolt; one end of the connecting component is connected to the screwing rod 8, and the other end of the connecting component is connected to the transmission component; the transmission component is rotatably sleeved on the outer peripheral wall of the support column 2, and the transmission component moves axially along the support column 2, and the other end of the connecting rope 6 is connected to the transmission component, so that the first piston driving member 5 drives the transmission component to move axially along the support column 2 through the connecting rope 6, driving the screwing rod 8 to lift. When in use, first install the input shaft of the steering gear in the positioning groove 4 of the mounting seat 3, install the bolt in the assembly hole of the output shaft of the steering gear, rotate the transmission component to make the screwing rod 8 correspond to the bolt, the first piston driving member 5 drives the connecting rope 6 to descend, and the connecting rope 6 drives the screwing rod 8 to descend through the transmission component and the connecting component until the locking hole on the screwing rod 8 clamps the bolt, the rotating motor 7 drives the screwing rod 8 to rotate, and screws the bolt onto the output shaft. After that, the first piston driving member 5 drives the connecting rope 6 to drive the rotating column to move up, the screwing rod 8 is separated from the bolt, and the operator removes the steering gear for the next operation. The bolt tightening tooling in this embodiment realizes the automatic alignment, clamping and precisely controlled torque locking of the bolt and the output shaft of the steering gear through the linkage control of the lifting mechanism and the rotating mechanism; the flexible cooperation between the connecting rope 6 and the transmission component enables the screwing rod 8 to have a high adaptability, can be compatible with the assembly requirements of steering gears of different sizes, significantly improves the efficiency and consistency of batch production, replaces the traditional manual tightening operation, and solves the problems of difficult alignment, uneven torque and low efficiency in the assembly process.

[0024] In this embodiment, as Figure 3As shown, the transmission assembly includes a first connecting member 9, a second connecting member 10, a third connecting member 11, a bearing 12, and a rotating cylinder 13. The first connecting member 9, the second connecting member 10, and the third connecting member 11 are fixedly connected in sequence from top to bottom. The inner ring of the bearing 12 is tightly sleeved on the outer peripheral wall of the third connecting member 11. The rotating cylinder 13 is tightly sleeved on the outer ring of the bearing 12. The rotating cylinder 13 is fixedly connected to the connecting assembly. The first connecting member 9 is provided with a rope hook 18 for connecting with the connecting rope 6. The support column 2 is provided with a chute 14 in the axial direction. The inner peripheral wall of the second connecting member 10 is provided with a slider 15 that cooperates with the chute 14. The modular connection of the first connecting member 9, the second connecting member 10, and the third connecting member 11 facilitates the rotational installation of the rotating cylinder 13. The slider 15 moves along the chute 14 to limit the second connecting member 10 and prevent the first connecting member 9, the second connecting member 10, and the third connecting member 11 from rotating circumferentially relative to the support column 2. The nested structure of the bearing 12 and the rotating cylinder 13 enables the smooth rotation of the transmission assembly, avoids the interference between the lifting and rotating actions, and improves the operating stability of the system.

[0025] As Figure 3 shown, the first connecting member 9 includes a first connecting ring 16 and a connecting plate 17 extending radially from the first connecting ring 16. The connecting plate 17 is provided with the rope hook 18. The second connecting member 10 includes a second connecting ring 19 and a convex block 20 arranged circumferentially along the second connecting ring 19. The third connecting member 11 includes a third connecting ring 21 and a bushing 22 coaxially arranged with the third connecting ring 21. The diameter of the third connecting ring 21 is larger than the diameter of the bushing 22. The first connecting ring 16 and the second connecting ring 19 are connected by screws. The convex block 20 and the third connecting ring 21 are connected by screws. The bearing 12 is sleeved on the outer peripheral wall of the bushing 22. The first connecting member 9, the second connecting member 10, and the third connecting member 11 can be integrally formed respectively.

[0026] As Figure 3 and 4As shown in the figure, the rotating cylinder 13 includes a first rotating part 23 and a second rotating part 24 coaxially connected to the first rotating part 23. The outer ring of the bearing 12 abuts against the inner peripheral wall of the second rotating part 24. The first rotating part 23 is sleeved on the outer peripheral wall of the second connecting ring 19. The diameter of the first rotating part 23 is larger than that of the second connecting ring 19, and the convex block 20 protrudes from the outer diameter wall of the first rotating part 23. The diameter of the first rotating part 23 being larger than that of the second connecting ring 19 enables the first rotating part 23 to be rotatably arranged on the outer peripheral wall of the second connecting ring 19. The first rotating part 23 is provided with a convex ring 25 along the circumferential direction. The number of the convex blocks 20 is multiple, and the multiple convex blocks 20 are evenly spaced along the circumferential direction of the second connecting ring 19. The edge of the convex ring 25 protrudes from the convex blocks 20, and the edge of the convex ring 25 is connected to the second rotating part 24 by screws. The first rotating part 23 is fixedly connected to the second rotating part 24 through the convex ring 25. The edge of the convex ring 25 covers the convex blocks 20 and is fixed by screws, forming a closed protection for the bearing 12 to prevent foreign objects from invading. The split connection between the first rotating part 23 and the second rotating part 24 facilitates the maintenance of the bearing 12. The first connecting member 9 and the second connecting member 10 clamp the first rotating part 23 in the middle. Through the clamping design, it is ensured that the rotating cylinder 13 moves synchronously with the connecting member when the transmission assembly moves up and down, eliminating the transmission delay.

[0027] As Figure 2 shown in the figure, the connection assembly includes a first connecting plate 2617 and a second connecting plate 2717. The first connecting plate 2617 is fixedly connected to one side of the outer wall of the rotating cylinder 13. One end of the second connecting plate 2717 is fixedly connected to the first connecting plate 2617. The end of the second connecting plate 2717 away from the first connecting plate 2617 is provided with a first support plate 28 and a second support plate 29. The first support plate 28 and the second support plate 29 are arranged at an angle. The first support plate 28 is provided with a first handle 30, and the second support plate 29 is provided with a second handle 31. The angle range between the first handle 30 and the second handle 31 is 100° - 150°, which is convenient for the user to grasp the first handle 30 and the second handle 31 with both hands respectively to rotate the rotating cylinder 13, so that the screwing rod 8 rotates the steering device. The double - handle design conforms to ergonomics, allowing the operator to apply force synergistically with both hands and reducing the rotation resistance.

[0028] In this embodiment, the first handle 30 is provided with a first touch key, the second handle 31 is provided with a second touch key, the tightening rod 8 is provided with a torque sensor 32 for real-time detection of the torque value when the bolt is tightened, the frame 1 is installed with a controller 33, and the first touch key, the second touch key, the torque sensor 32, the rotating motor 7, and the first piston driving member 5 are electrically connected to the controller 33 respectively. The operator holds the first handle 30 and the second handle 31, aligns the tightening rod 8 with the steering gear, presses the first touch key, and the controller controls the first piston driving member 5 to drive the connecting rope 6 to descend to a suitable position, so that the locking hole of the tightening rod 8 locks the bolt. Press the first touch key again, and the first piston driving member 5 stops working. Then press the second touch key, and the controller controls the rotating motor 7 to drive the tightening rod 8 to start rotating, so that the tightening rod 8 locks the bolt on the output shaft of the steering gear. The torque sensor 32 transmits the detected torque information to the controller 33. When the controller calculates that the torque of the bolt reaches the threshold, it controls the rotating motor 7 to stop rotating. Then the operator presses the first touch key, and the controller controls the first piston driving member 5 to drive the connecting rope 6 to rise, so that the tightening rod 8 is separated from the bolt. The first touch key and the second touch key are respectively trigger buttons, and the trigger signals include short press and long press modes. The controller performs segmented control operations according to the trigger modes.

[0029] In this embodiment, the inner wall of the locking hole of the tightening rod 8 is provided with anti-slip lines, which match the outer contour of the bolt. The positioning groove 4 of the mounting seat 3 and the locking hole of the tightening rod 8 are coaxially corresponding, and the axis of the tightening rod 8 coincides with the axis of the output shaft of the steering gear. Make the axis of the locking hole coincide with the axis of the output shaft of the steering gear.

[0030] As Figure 5 shown, it further includes a pressing component, which includes a second piston driving member 34, a bracket 35 and a pressing plate 36. The output end of the second piston driving member 34 is connected to one end of the pressing plate 36, and the other end of the pressing plate 36 extends above the mounting seat 3. One end of the bracket 35 is installed on the frame 1, and the other end of the bracket 35 is rotatably connected between both ends of the pressing plate 36. The first piston driving member 5 and the second piston driving member 34 can be cylinders or hydraulic cylinders. When the steering gear is installed on the mounting seat 3, the output end of the second piston driving member 34 extends out, and the bracket 35 plays a lever role, and the other end of the pressing plate 36 moves downward to press the steering gear, avoiding the steering gear from shaking when the tightening rod 8 tightens the bolt. After the bolt is tightened, the output end of the second piston driving member 34 retracts with one end of the pressing plate 36, and the other end of the pressing plate 36 tilts up, facilitating the operator to remove the steering gear.

[0031] As Figure 5As shown, the pressing plate 36 is provided with a first card slot 37 and a second card slot 38. The second piston driving member 34 is rotationally engaged with the first card slot 37 through a first rotating shaft 39. One end of the bracket 35 away from the frame 1 is provided with a clamping projection 41, and the clamping projection 41 is rotationally engaged with the second card slot 38 through a second rotating shaft 40. The length of the first card slot 37 is greater than the diameter of the output end of the second piston driving member 34, and the length of the second card slot 38 is greater than the length of the clamping projection 41, reserving a moving space for the rotation of the second piston driving member 34 in the first card slot 37 and the rotation of the clamping projection 41 in the second card slot 38.

[0032] It can be understood that the specific embodiments described above are only used to explain the relevant invention, rather than limiting the invention. In addition, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions without contradiction or conflict. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention, directly or indirectly applied in other related technical fields, is equally included in the protection scope of the present invention.

Claims

1. A bolt tightening tool, characterized in that: include: frame; A support column, vertically fixed on the frame; A mounting seat is arranged at the bottom of the frame and is provided with a positioning groove for mounting the steering gear; The lifting mechanism comprises a first piston driving member and a connecting rope, wherein the first piston driving member is installed on the top of the frame, and one end of the connecting rope is connected to the first piston driving member; A rotating mechanism, comprising a rotating motor, a screw-tightening rod, a connecting assembly and a transmission assembly; The output end of the rotating motor is coaxially connected to the screw rod, and the screw rod is provided with a locking hole for bolt matching; One end of the connecting assembly is connected to the screw rod, and the other end of the connecting assembly is connected to the transmission assembly; The transmission assembly is rotatably sleeved on the outer peripheral wall of the pillar, and the transmission assembly moves axially along the pillar. The other end of the connecting rope is connected to the transmission assembly, so that the first piston driving member drives the transmission assembly to move axially along the pillar through the connecting rope, driving the tightening rod to rise and fall.

2. The bolt tightening tool according to claim 1, characterized in that: The transmission assembly includes a first connecting member, a second connecting member, a third connecting member, a bearing and a rotating drum. The first connecting member, the second connecting member and the third connecting member are fixedly connected in sequence from top to bottom. The inner ring of the bearing is fastened on the outer circumferential wall of the third connecting member. The rotating drum is fastened on the outer ring of the bearing. The rotating drum is fixedly connected to the connecting assembly. The first connecting member is provided with a rope hook connected to a connecting rope. The support is provided with a sliding groove along the axial direction. The inner circumferential wall of the second connecting member is provided with a sliding block matched with the sliding groove.

3. The bolt tightening tool according to claim 2, characterized in that: The first connecting member includes a first connecting ring and a connecting plate extending radially along the first connecting ring, the connecting plate is provided with the rope hook, the second connecting member includes a second connecting ring and a protrusion arranged circumferentially along the second connecting ring, the third connecting member includes a third connecting ring and a bushing coaxially arranged with the third connecting ring, the diameter of the third connecting ring is larger than the diameter of the bushing, the first connecting ring is connected to the second connecting ring by screws, the protrusion is connected to the third connecting ring by screws, and the bearing sleeve is arranged on the outer peripheral wall of the bushing.

4. The bolt tightening tool according to claim 3, characterized in that: The rotating drum includes a first rotating part and a second rotating part coaxially connected to the first rotating part, the outer ring of the bearing abuts against the inner circumferential wall of the second rotating part, the first rotating part is sleeved on the outer circumferential wall of the second connecting ring, the diameter of the first rotating part is larger than the diameter of the second connecting ring, and the protrusion protrudes from the outer diameter wall of the first rotating part.

5. The bolt tightening tool according to claim 4, characterized in that: The first rotating part is provided with a convex ring along the circumference, and the number of the convex blocks is multiple, and the multiple convex blocks are evenly spaced along the circumference of the second connecting ring. The edge of the convex ring protrudes from the convex blocks, and the edge of the convex ring is connected to the second rotating part by screws.

6. The bolt tightening tool according to claim 1, characterized in that: The connecting assembly includes a first connecting plate and a second connecting plate, the first connecting plate is fixedly connected to one side of the outer wall of the rotating drum, one end of the second connecting plate is fixedly connected to the first connecting plate, the end of the second connecting plate away from the first connecting plate is provided with a first support plate and a second support plate, the first support plate and the second support plate are arranged at an angle, the first support plate is provided with a first handle, and the second support plate is provided with a second handle.

7. The bolt tightening tool according to claim 6, characterized in that: The first handle is provided with a first touch key, the second handle is provided with a second touch key, the tightening rod is provided with a torque sensor for real-time detection of the torque value when the bolt is tightened, the frame is installed with a controller, and the first touch key, the second touch key, the torque sensor, the rotating motor, and the first piston drive are electrically connected to the controller respectively.

8. The bolt tightening tool according to claim 1, characterized in that: The inner wall of the locking hole of the screw rod is provided with anti-skid patterns, and the anti-skid patterns match the outer contour of the bolt. The positioning groove of the mounting seat is coaxially arranged with the locking hole of the screw rod, and the axis of the screw rod coincides with the axis of the steering gear output shaft.

9. The bolt tightening tool according to claim 1, characterized in that: It also includes a clamping assembly, which includes a second piston driving member, a bracket and a pressure plate, wherein the output end of the second piston driving member is connected to one end of the pressure plate, and the other end of the pressure plate extends above the mounting seat, one end of the bracket is installed on the frame, and the other end of the bracket is rotatably connected to both ends of the pressure plate.

10. The bolt tightening tool according to claim 9, characterized in that: The pressure plate is provided with a first clamping groove and a second clamping groove, the second piston driving member is rotatably matched with the first clamping groove via a first rotating shaft, and the bracket is provided with a clamping protrusion at one end away from the frame, and the clamping protrusion is rotatably matched with the second clamping groove via a second rotating shaft.

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