Secondary cooling section roller bearing seat bolt fastening device and operation method thereof

Abstract

The invention relates to the technical field of special equipment repair, in particular to a secondary cooling section roller bearing seat bolt fastening device and an operation method thereof. The secondary cooling section roller bearing seat bolt fastening device comprises a fixed base, an adjustable torque electric wrench with a Bluetooth function and a mechanical arm assembly, the fixed base is detachably connected with the portion, close to a bolt installation position, of the side wall, and a lengthened sleeve is assembled on the adjustable torque electric wrench; the torque-adjustable electric wrench can be hinged to the head end of the mechanical arm assembly in the mode that the torque-adjustable electric wrench can move up and down in the vertical direction, the tail end of the mechanical arm assembly is fixedly connected with the fixed base, and all bolt fastening positions on a secondary cooling section roller bearing seat are located within the moving range of the mechanical arm assembly. The bolt fastening device can improve the operation quality and the operation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of special equipment repair, and in particular to a bolt fastening device for a secondary cooling section roller bearing seat, and an operating method of the device. Background Art

[0002] The secondary cooling section device on the vertical slab continuous casting machine is the core component of the steelmaking vertical slab continuous casting process. The efficiency and quality of its repair will directly affect the normal production of the vertical slab. Limited by the special process and equipment structure of the secondary cooling section device, the supporting maintenance platform is small and the maintenance space is seriously insufficient; at the same time, the bolts of the roller bearing seat on the secondary cooling section device are not only located in the narrow gap about two meters above the ground, but also located at the bottom of the secondary cooling section device relative to the ground, and the final tightening torque of the bolts is required to reach 467N·m. This makes it impossible to use conventional electric wrenches for bolt tightening operations, and it is necessary to use homemade extended sleeves to manually tighten the bolts.

[0003] However, the manual tightening of bolts can easily lead to different operators and operating environments, and it is difficult to ensure the consistency of the bolt assembly torque of the roller bearing seat on the secondary cooling section device. This sometimes causes the roller flatness on the secondary cooling section device to be different due to the inadequate tightening of the bearing seat bolts. At this time, it is necessary to re-tighten the bolts of all bearing seats, and it is often necessary to repeat the operation 5-6 times to correct the roller flatness on the secondary cooling section device, which has low work efficiency and high labor intensity. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a bolt fastening device for a secondary cooling section roller bearing seat which can improve operation quality and operation efficiency.

[0005] The present invention adopts the following technical solution:

[0006] The present invention provides a bolt tightening device for a secondary cooling section roller bearing seat, comprising a fixed base, an adjustable torque electric wrench with a Bluetooth function and a mechanical arm assembly. The fixed base is detachably connected to a side wall near a bolt installation position, the adjustable torque electric wrench is equipped with an extended sleeve, the adjustable torque electric wrench can be hinged at the head end of the mechanical arm assembly so as to be able to move vertically up and down, the tail end of the mechanical arm assembly is fixedly connected to the fixed base, and all bolt tightening positions on the secondary cooling section roller bearing seat are within the moving range of the mechanical arm assembly.

[0007] Preferably, a plurality of mounting holes are provided on the fixed base, and a plurality of threaded members are correspondingly inserted into the plurality of mounting holes and are threadedly connected with the side wall near the bolt mounting position.

[0008] Preferably, the robotic arm assembly includes a first rotating seat, a first rotating support arm, a second rotating seat and a second rotating support arm, the first rotating seat is fixed on a fixed base, one end of the first rotating support arm is axially rotatably connected to the first rotating seat, the other end of the first rotating support arm is fixed to the second rotating seat, one end of the second rotating support arm is axially rotatably hinged to the second rotating seat, the other end of the second rotating support arm is hinged to the adjustable torque electric wrench, and the second rotating support arm and the adjustable torque electric wrench can both rotate vertically up and down relative to the hinge point.

[0009] Preferably, the first rotating seat includes a first inner cylinder, a first outer cylinder and a first latch, the first inner cylinder is rotatably inserted into the first outer cylinder and fixedly connected to the fixed base, the first outer cylinder is fixedly connected to the first rotating support arm, and a first plug hole is opened on the side of the first outer cylinder, the first latch is rotated in the first plug hole and abuts against the outer wall of the first inner cylinder.

[0010] Preferably, the second rotating seat includes a second inner cylinder, a second outer cylinder and a second latch, the second inner cylinder is rotatably inserted into the second outer cylinder and is hinged to the second rotating support arm, the second outer cylinder is fixedly connected to the first rotating support arm, and a second plug hole is opened on the side of the second outer cylinder, the second latch is rotated in the second plug hole and abuts against the outer wall of the second inner cylinder.

[0011] Preferably, the second rotating support arm includes, from low to high, a lower hinged plate, a lower support arm, an upper support arm and an upper hinged plate, the lower hinged plate is fixed on the second rotating seat, the adjustable torque electric wrench is hinged on the upper hinged plate, one end of the upper support arm and one end of the lower support arm are hinged on the lower hinged plate at intervals, and the other end of the upper support arm and the other end of the lower support arm are hinged on the upper hinged plate at intervals.

[0012] Preferably, both the lower support arm and the upper support arm are provided with a receiving groove, the fixed end of the nitrogen spring is hingedly arranged in the receiving groove of the lower support arm, and the driving end of the nitrogen spring is hingedly arranged in the receiving groove of the upper support arm. When the interval between the lower support arm and the upper support arm at the position of the upper hinge plate is the smallest, the nitrogen spring is in an extreme compression state.

[0013] Preferably, the adjustable torque electric wrench is equipped with a fine-adjustment handle and a third plug-in hole, and an arc-shaped plug-in groove extending around the hinge axis of the adjustable torque electric wrench is opened on the upper hinge plate, the third pin passes through the arc-shaped plug-in groove and is rotated in the third plug-in hole, and the third pin abuts against the upper hinge plate at the position of the arc-shaped plug-in groove.

[0014] Preferably, the adjustable torque electric wrench is equipped with a reaction arm, and the start and stop buttons of the adjustable torque electric wrench are arranged on the fine-tuning handle.

[0015] The present invention also provides an operating method of the above-mentioned second cooling section roller bearing seat bolt fastening device, comprising the following steps:

[0016] S1: Manually drag the bolt fastening device of the roller bearing seat of the second cooling section to the vicinity of the bolt fastening position, and detachably connect the fixed base to the side wall near the bolt installation position;

[0017] S2: Turn on the power of the adjustable torque electric wrench, set the tightening torque, and connect the mobile phone to the adjustable torque electric wrench via Bluetooth;

[0018] S3: manually operate the mechanical arm assembly to place the adjustable torque electric wrench below the bolt tightening position, then drive the adjustable torque electric wrench to rise, and make the extended sleeve on the adjustable torque electric wrench match with the nut of the bolt;

[0019] S4: Manually operate the adjustable torque electric wrench to rotate. After the bolt is tightened to the preset value, the adjustable torque electric wrench automatically stops working and automatically sends the final tightening peak torque to the mobile phone program;

[0020] S5: Repeat steps S3-S4 until all bolts at the bolt tightening positions on the secondary cooling section roller bearing seat are tightened.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The bolt tightening device for the second cooling section roller bearing seat of the present invention can be installed on the side wall near the bolt installation position through the fixed base. The operator can manually operate the mechanical arm assembly to move, so that the extended sleeve on the adjustable torque electric wrench can cooperate with the nut of the bolt. After that, the operator can start the adjustable torque electric wrench to rotate, and there is no need to hold the wrench for manual operation. At the same time, since the mechanical arm assembly can cover all bolt tightening positions, the adjustable torque electric wrench can complete the tightening operation of all bolts without moving the fixed base again, thereby improving the working efficiency and bolt tightening quality.

[0023] In addition, the adjustable torque electric wrench has a Bluetooth function, which can transmit data to the mobile phone APP via Bluetooth to achieve real-time monitoring and recording of the final tightening torque of the bolts, prevent the difference in roller flatness on the secondary cooling section device due to the failure to tighten some bolts of the bearing seat in place, avoid rework of bolt tightening, and improve work efficiency.

[0024] The operating method of the secondary cooling section roller bearing seat bolt fastening device of the present invention can greatly improve the efficiency and quality of the repair and replacement construction of the secondary cooling section device on the vertical slab continuous casting machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the bolt fastening device for the second cooling section roller bearing seat in an embodiment of the present invention.

[0026] Figure 2 It is a schematic structural diagram of the bolt fastening device for the second cooling section roller bearing seat after removing the main body of the wrench in an embodiment of the present invention.

[0027] Figure 3 It is a schematic diagram of the structure of the first rotating seat on the bolt fastening device of the second cooling section roller bearing seat in an embodiment of the present invention.

[0028] Figure 4 It is a schematic diagram of the structure of the second rotating seat on the bolt fastening device of the second cooling section roller bearing seat in an embodiment of the present invention.

[0029] Figure 5 It is a schematic diagram of the structure of the second rotating support arm on the bolt fastening device of the second cooling section roller bearing seat in an embodiment of the present invention.

[0030] The reference numerals are described as follows:

[0031] 1. Fixed base 32, first rotating support arm

[0032] 11. Mounting hole 33, second rotating seat

[0033] 2. Adjustable torque electric wrench 331, second inner cylinder

[0034] 21. Extended sleeve 332. Second outer cylinder

[0035] 22. Fine-tuning handle 333. Second latch

[0036] 23. Third plug hole 334. Second plug hole

[0037] 24. third latch 34. second rotating support arm

[0038] 25. Reaction arm 341. Lower hinge plate

[0039] 3. Mechanical arm assembly 342, lower support arm

[0040] 31. First rotating seat 343. Upper support arm

[0041] 311, first inner cylinder 344, upper hinge plate

[0042] 312, first outer cylinder 345, arc-shaped plug-in slot

[0043] 313, first latch 4, nitrogen spring

[0044] 314. First socket DETAILED DESCRIPTION

[0045] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0049] See also Figure 1 The present embodiment provides a bolt tightening device for a second cooling section roller bearing seat, comprising a fixed base 1, an adjustable torque electric wrench 2 with a Bluetooth function, and a mechanical arm assembly 3. The fixed base 1 is detachably connected to a side wall near a bolt installation position. The adjustable torque electric wrench 2 is equipped with an extended sleeve 21. The adjustable torque electric wrench 2 is hinged to the head end of the mechanical arm assembly 3 so as to be able to move vertically up and down. The tail end of the mechanical arm assembly 3 is fixedly connected to the fixed base 1. All bolt tightening positions on the second cooling section roller bearing seat are within the moving range of the mechanical arm assembly 3.

[0050] The bolt tightening device of the second cooling section roller bearing seat of this embodiment can be installed on the side wall near the bolt installation position through the fixed base 1. The operator can manually operate the mechanical arm assembly 3 to move, so that the extended sleeve 21 on the adjustable torque electric wrench 2 can cooperate with the nut of the bolt. After that, the operator can start the adjustable torque electric wrench 2 to rotate, and there is no need to hold the wrench for manual operation; at the same time, because the mechanical arm assembly 3 can cover all bolt tightening positions, the adjustable torque electric wrench 2 can complete the tightening operation of all bolts without moving the fixed base 1 again, thereby improving the working efficiency and bolt tightening quality.

[0051] In addition, the adjustable torque electric wrench 2 has a Bluetooth function, which can transmit data to the mobile phone APP via Bluetooth to achieve real-time monitoring and recording of the final tightening torque of the bolts, prevent the difference in roller flatness on the second cooling section device due to the inadequate tightening of some bolts of the bearing seat, avoid rework of bolt tightening, and improve work efficiency.

[0052] Preferably, in this embodiment, the adjustable torque electric wrench 2 with Bluetooth function is preferably a Patel BT15 torque wrench.

[0053] Preferably, see Figure 3 A plurality of mounting holes 11 are provided on the fixed base 1, and a plurality of threaded members are correspondingly inserted into the plurality of mounting holes 11 and are threadedly connected with the side wall near the bolt installation position.

[0054] Specifically, in this embodiment, the side wall near the bolt installation position includes structures on the sides of the east and west repair and maintenance platforms. When it is necessary to temporarily fix the second cooling section roller bearing seat bolt fastening device of this embodiment at a suitable position on the work site, the fixed base 1 is fixed to the structure on the side of any one of the east and west repair and maintenance platforms through the installation hole 11.

[0055] Preferably, see Figure 1 and Figure 2 The mechanical arm assembly 3 includes a first rotating seat 31, a first rotating support arm 32, a second rotating seat 33 and a second rotating support arm 34. The first rotating seat 31 is fixed on the fixed base 1, one end of the first rotating support arm 32 is axially rotatably connected to the first rotating seat 31, the other end of the first rotating support arm 32 is fixed to the second rotating seat 33, one end of the second rotating support arm 34 is axially rotatably hinged on the second rotating seat 33, the other end of the second rotating support arm 34 is hinged to the adjustable torque electric wrench 2, and the second rotating support arm 34 and the adjustable torque electric wrench 2 can rotate vertically up and down relative to the hinge point.

[0056] The first rotating support arm 32 and the second rotating support arm 34 are used to provide support, freeing the operator's hands and no longer needing to hold the adjustable torque electric wrench 2 all the time; the setting of the first rotating seat 31 and the second rotating seat 33 enables the first rotating support arm 32 to rotate axially relative to the first rotating seat 31, and the second rotating support arm 34 to rotate axially relative to the second rotating seat 33, thereby achieving that all bolt tightening positions on the second cold section roller bearing seat are located within the moving range of the robot arm assembly 3; and the second rotating support arm 34 is hinged to the second rotating seat 33, and the adjustable torque electric wrench 2 is hinged to the second rotating support arm 34, so that the adjustable torque electric wrench 2 can move up and down in the vertical direction, and can adjust the deflection angle of the extension sleeve 21 to achieve the cooperation between the extension sleeve 21 and the bolt nut.

[0057] Preferably, see Figure 2 and Figure 3 The first rotating seat 31 includes a first inner cylinder 311, a first outer cylinder 312 and a first latch 313. The first inner cylinder 311 is rotatably inserted into the first outer cylinder 312 and is fixedly connected to the fixed base 1. The first outer cylinder 312 is fixedly connected to the first rotating support arm 32, and a first plug hole 314 is opened on the side of the first outer cylinder 312. The first latch 313 is rotated in the first plug hole 314 and abuts against the outer wall of the first inner cylinder 311.

[0058] When it is necessary to start the adjustable torque electric wrench 2 to perform bolt tightening operations, in order to ensure that the first rotating support arm 32 provides good support for the adjustable torque electric wrench 2, it is necessary to screw the first pin 313 into the first plug hole 314 and abut against the outer wall of the first inner cylinder 311, so that the first inner cylinder 311 and the first outer cylinder 312 cannot rotate relative to each other, thereby completing the rotation limit between the first rotating support arm 32 and the fixed base 1; and when it is necessary to move the adjustable torque electric wrench 2 to the next bolt tightening position for tightening operations, it is necessary to screw the first pin 313 out of the first plug hole 314 to release the rotation limit between the first rotating support arm 32 and the fixed base 1.

[0059] Preferably, see Figure 2 and Figure 4 The second rotating seat 33 includes a second inner cylinder 331, a second outer cylinder 332 and a second latch 333. The second inner cylinder 331 is rotatably inserted into the second outer cylinder 332 and is hinged to the second rotating support arm 34. The second outer cylinder 332 is fixedly connected to the first rotating support arm 32, and a second plug hole 334 is opened on the side of the second outer cylinder 332. The second latch 333 is rotated in the second plug hole 334 and abuts against the outer wall of the second inner cylinder 331.

[0060] When it is necessary to start the adjustable torque electric wrench 2 to perform bolt tightening operations, in order to ensure that the second rotating support arm 34 provides good support for the adjustable torque electric wrench 2, it is necessary to screw the second pin 333 into the second plug hole 334 and abut against the outer wall of the second inner cylinder 331, so that the second inner cylinder 331 and the second outer cylinder 332 cannot rotate relative to each other, thereby completing the rotation limit between the second rotating support arm 34 and the first rotating support arm 32; and when it is necessary to move the adjustable torque electric wrench 2 to the next bolt tightening position for tightening operations, it is necessary to screw the second pin 333 out of the second plug hole 334 to release the rotation limit between the second rotating support arm 34 and the first rotating support arm 32.

[0061] Preferably, see Figure 1 , Figure 2 and Figure 5 The second rotating support arm 34 includes, from low to high, a lower hinged plate 341, a lower support arm 342, an upper support arm 343 and an upper hinged plate 344. The lower hinged plate 341 is fixed on the second rotating seat 33, the adjustable torque electric wrench 2 is hinged on the upper hinged plate 344, one end of the upper support arm 343 and one end of the lower support arm 342 are hinged on the lower hinged plate 341 at intervals, and the other end of the upper support arm 343 and the other end of the lower support arm 342 are hinged on the upper hinged plate 344 at intervals. When the second rotating support arm 34 is controlled to be lifted, the lower support arm 342, the upper support arm 343 and the adjustable torque electric wrench 2 hinged on the upper hinged plate 344 are lifted synchronously.

[0062] Preferably, see Figure 2 and Figure 5 , both the lower support arm 342 and the upper support arm 343 are provided with a receiving groove, the fixed end of the nitrogen spring 4 is hingedly set in the receiving groove of the lower support arm 342, and the driving end of the nitrogen spring 4 is hingedly set in the receiving groove of the upper support arm 343. When the interval between the lower support arm 342 and the upper support arm 343 at the position of the upper hinge plate 344 is the smallest, the nitrogen spring 4 is in an extreme compression state.

[0063] The setting of the nitrogen spring 4 can provide auxiliary assistance for the lifting of the adjustable torque electric wrench 2. It is only necessary to manually press the gap between the lower support arm 342 and the upper support arm 343 at the position of the upper hinge plate 344 to the minimum. Then, when adjusting the adjustable torque electric wrench 2 to move vertically up and down to cooperate with the nut of the bolt, the nitrogen spring 4 releases the compression force to produce a fine-tuning effect, so that the adjustable torque electric wrench 2 can be lifted stably and slowly, which is conducive to ensuring the accurate cooperation between the extended sleeve 21 on the adjustable torque electric wrench 2 and the bolt nut.

[0064] Preferably, see Figure 1 , Figure 2 and Figure 5The adjustable torque electric wrench 2 is equipped with a fine-adjustment handle 22 and a third plug-in hole 23. An arc-shaped plug-in groove 345 extending around the hinge axis of the adjustable torque electric wrench 2 is opened on the upper hinge plate 344. The third latch 24 passes through the arc-shaped plug-in groove 345 and is screwed into the third plug-in hole 23, and the third latch 24 abuts against the upper hinge plate 344 at the position of the arc-shaped plug-in groove 345.

[0065] The fine-tuning handle 22 is provided so that the operator can hold it manually, and by applying force to the fine-tuning handle 22, the deflection angle of the adjustable torque electric wrench 2 can be fine-tuned to complete the centering of the extended sleeve 21 and the bolt nut; and the third pin 24 can limit the deflection of the adjustable torque electric wrench 2 after the fine-tuning handle 22 completes the centering and deflection adjustment, to ensure the coordinated installation of the extended sleeve 21 and the bolt nut.

[0066] Preferably, see Figure 1 The adjustable torque electric wrench 2 is equipped with a reaction arm 25, and the start / stop button of the adjustable torque electric wrench 2 is arranged on the fine-tuning handle 22. The reaction arm 25 can bear the torque reverse force of the adjustable torque electric wrench 2 when the operator operates the adjustable torque electric wrench 2 for tightening operations, reduce the load of the mechanical arm assembly 3, and extend the service life of the mechanical arm assembly 3; and the start / stop button of the adjustable torque electric wrench 2 is arranged on the fine-tuning handle 22, so that the adjustable torque electric wrench 2 can be conveniently operated by one person.

[0067] This embodiment also provides an operation method of the above-mentioned second cooling section roller bearing seat bolt fastening device, comprising the following steps:

[0068] S1: Manually drag the bolt fastening device of the roller bearing seat of the second cooling section to the vicinity of the bolt fastening position, and detachably connect the fixed base 1 to the side wall near the bolt installation position;

[0069] S2: Turn on the power of the adjustable torque electric wrench 2, set the tightening torque, and connect the mobile phone to the adjustable torque electric wrench 2 via Bluetooth;

[0070] S3: manually operate the mechanical arm assembly 3 to place the adjustable torque electric wrench 2 below the bolt tightening position, then drive the adjustable torque electric wrench 2 to rise, and make the extended sleeve 21 on the adjustable torque electric wrench 2 fit with the nut of the bolt;

[0071] S4: manually operate the adjustable torque electric wrench 2 to rotate, and after the bolt is tightened to the preset value, the adjustable torque electric wrench 2 automatically stops working, and the final tightening peak torque is automatically sent to the mobile phone program;

[0072] S5: Repeat steps S3-S4 until all bolts at the bolt tightening positions on the secondary cooling section roller bearing seat are tightened.

[0073] The operating method of the bolt fastening device for the secondary cooling section roller bearing seat of this embodiment can greatly improve the efficiency and quality of the repair and replacement construction of the secondary cooling section device on the vertical slab continuous casting machine.

[0074] The secondary cooling section roller bearing seat bolt tightening device and its operation method of this embodiment can ensure the accuracy of the roller flatness on the on-site secondary cooling section device, guarantee the maintenance quality, solve the problems of poor tightening quality of the roller bearing seat bolts of the secondary cooling section device on the vertical slab continuous casting machine and low operating efficiency, and improve the quality standardization of the operation process.

[0075] Specifically, the second cooling section roller bearing seat bolt tightening device and its operating method of this embodiment can complete the equipment maintenance tasks of our company in the stainless line continuous casting area of ​​TISCO Steelmaking Plant No. 1 with higher quality and higher efficiency, and is suitable for more similar maintenance projects and is worthy of promotion.

[0076] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A bolt fastening device for the roller bearing seat of the second cooling section, characterized in that: The invention comprises a fixed base (1), an adjustable torque electric wrench (2) with a Bluetooth function, and a mechanical arm assembly (3); the fixed base (1) is detachably connected to a side wall near a bolt installation position; the adjustable torque electric wrench (2) is equipped with an extended sleeve (21); the adjustable torque electric wrench (2) is hinged to the head end of the mechanical arm assembly (3) so as to be movable vertically up and down; the tail end of the mechanical arm assembly (3) is fixedly connected to the fixed base (1); and all bolt fastening positions on a bearing seat of a second cooling section roller are within the moving range of the mechanical arm assembly (3).

2. The bolt fastening device for the roller bearing seat of the second cooling section according to claim 1 is characterized in that: The fixed base (1) is provided with a plurality of mounting holes (11), and a plurality of threaded members are correspondingly inserted into the plurality of mounting holes (11) and are threadedly connected to the side wall near the bolt mounting position.

3. The bolt fastening device for the second cooling section roller bearing seat according to claim 1 is characterized in that: The mechanical arm assembly (3) comprises a first rotating seat (31), a first rotating support arm (32), a second rotating seat (33) and a second rotating support arm (34); the first rotating seat (31) is fixed on the fixed base (1); one end of the first rotating support arm (32) is axially rotatably connected to the first rotating seat (31); the other end of the first rotating support arm (32) is fixed on the second rotating seat (33); one end of the second rotating support arm (34) is axially rotatably hinged on the second rotating seat (33); the other end of the second rotating support arm (34) is hinged to the adjustable torque electric wrench (2); and the second rotating support arm (34) and the adjustable torque electric wrench (2) can both rotate vertically up and down relative to the hinge point.

4. The bolt fastening device for the second cooling section roller bearing seat according to claim 3 is characterized in that: The first rotating seat (31) comprises a first inner cylinder (311), a first outer cylinder (312) and a first latch (313); the first inner cylinder (311) is rotatably inserted into the first outer cylinder (312) and is fixedly connected to the fixed base (1); the first outer cylinder (312) is fixedly connected to the first rotating support arm (32); a first plug hole (314) is provided on the side of the first outer cylinder (312); the first latch (313) is rotatably installed in the first plug hole (314) and abuts against the outer wall of the first inner cylinder (311).

5. The bolt fastening device for the second cooling section roller bearing seat according to claim 4 is characterized in that: The second rotating seat (33) includes a second inner cylinder (331), a second outer cylinder (332) and a second latch (333); the second inner cylinder (331) is rotatably inserted into the second outer cylinder (332) and is hinged to the second rotating support arm (34); the second outer cylinder (332) is fixedly connected to the first rotating support arm (32); a second plug hole (334) is provided on the side of the second outer cylinder (332); the second latch (333) is rotatably installed in the second plug hole (334) and abuts against the outer wall of the second inner cylinder (331).

6. The bolt fastening device for the second cooling section roller bearing seat according to claim 3 is characterized in that: The second rotating support arm (34) comprises, from bottom to top, a lower hinged plate (341), a lower support arm (342), an upper support arm (343) and an upper hinged plate (344); the lower hinged plate (341) is fixed on the second rotating seat (33); the adjustable torque electric wrench (2) is hinged on the upper hinged plate (344); one end of the upper support arm (343) and one end of the lower support arm (342) are hinged on the lower hinged plate (341) at intervals; the other end of the upper support arm (343) and the other end of the lower support arm (342) are hinged on the upper hinged plate (344) at intervals.

7. The bolt fastening device for the second cooling section roller bearing seat according to claim 6 is characterized in that: The lower support arm (342) and the upper support arm (343) are both provided with a receiving groove, the fixed end of the nitrogen spring (4) is hingedly arranged in the receiving groove of the lower support arm (342), and the driving end of the nitrogen spring (4) is hingedly arranged in the receiving groove of the upper support arm (343), and when the interval between the lower support arm (342) and the upper support arm (343) at the position of the upper hinge plate (344) is the smallest, the nitrogen spring (4) is in an extreme compression state.

8. The bolt fastening device for the second cooling section roller bearing seat according to claim 6 is characterized in that: The adjustable torque electric wrench (2) is provided with a fine-adjustment handle (22) and a third plug hole (23); the upper hinge plate (344) is provided with an arc-shaped plug groove (345) extending around the hinge axis of the adjustable torque electric wrench (2); the third latch pin (24) passes through the arc-shaped plug groove (345) and is screwed into the third plug hole (23); and the third latch pin (24) abuts against the upper hinge plate (344) at the position of the arc-shaped plug groove (345).

9. The bolt fastening device for the second cooling section roller bearing seat according to claim 8, characterized in that: The adjustable torque electric wrench (2) is equipped with a reaction arm (25), and the start / stop button of the adjustable torque electric wrench (2) is arranged on the fine-tuning handle (22).

10. The operating method of the bolt fastening device for the roller bearing seat of the second cooling section according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: manually dragging the bolt fastening device of the roller bearing seat of the second cooling section to the vicinity of the bolt fastening position, and detachably connecting the fixed base (1) to the side wall near the bolt installation position; S2: Turning on the power of the adjustable torque electric wrench (2), setting the tightening torque, and connecting the adjustable torque electric wrench (2) via Bluetooth via a mobile phone; S3: manually operating the mechanical arm assembly (3) so that the adjustable torque electric wrench (2) is located below the bolt tightening position, and then driving the adjustable torque electric wrench (2) to rise, and making the extended sleeve (21) on the adjustable torque electric wrench (2) cooperate with the nut of the bolt; S4: manually operating the adjustable torque electric wrench (2) to rotate, and after the bolt is tightened to a preset value, the adjustable torque electric wrench (2) automatically stops working, and the final tightening peak torque is automatically sent to the mobile phone program; S5: Repeat steps S3-S4 until all bolts at the bolt tightening positions on the secondary cooling section roller bearing seat are tightened.

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