Self-adaptive centering device for stretching unit of reactor bolt stretcher

Abstract

The invention discloses a self-adaptive centering device for a stretching unit of a reactor bolt stretching machine, relates to the technical field of bolt stretching machines, and provides a technical scheme of the self-adaptive centering device for the stretching unit of the reactor bolt stretching machine, the self-adaptive centering device comprises a stretching device, an unfolding device, a nut mounting device and a bolt mounting device, the stretching device is connected with the unfolding devices, the stretching device is connected with the nut mounting device in a sliding mode, the stretching device abuts against the bolt mounting device, the number of the unfolding devices is three, the three unfolding devices are evenly distributed on the stretching device, the nut mounting device is used for fixing nuts, and the bolts are fixed by connecting the bolts with the bolt mounting device. And then the bolt mounting device is lifted by pressurizing the stretching device, so that the bolt mounting device drives the bolt to stretch, and the stress area of the stretching device near the surface of the bolt is increased through the unfolding device.

Description

Technical Field

[0001] The invention relates to the technical field of bolt tensioners, in particular to an adaptive centering device for a tensioning unit of a reactor bolt tensioner. Background Art

[0002] As the living standards of Chinese people continue to improve, people's demand for energy is also increasing. The country's utilization of nuclear energy is also increasing. Among them, the types and models of nuclear reactor pressure vessels are also gradually increasing. The importance of tools used to pre-tighten and stretch the main bolts on reactor pressure vessels is becoming increasingly prominent.

[0003] Traditional tensile equipment relies on a rigid structure to apply unidirectional tension to bolts, which has the following significant defects: due to the small force-bearing area of the contact surface between the bolt and the pressure vessel, the sealing surface is easily deformed or even cracked due to stress concentration, resulting in local stress overload; the fixed structure cannot dynamically adjust the support area according to the tensile pressure and is prone to instability under high pressure; in addition, traditional equipment lacks self-resetting and expansion capabilities, making it difficult to meet the reliability and reuse requirements of high-safety scenarios such as nuclear reactors. Summary of the Invention

[0004] The object of the present invention is to provide an adaptive centering device for a tensioning unit of a reactor bolt tensioner, so as to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A technical solution for an adaptive centering device for a tensioning unit of a reactor bolt tensioner. The adaptive centering device includes a tensioning device, an expansion device, a nut mounting device, and a bolt mounting device. The tensioning device and the expansion device are connected, the tensioning device and the nut mounting device are slidingly connected, the tensioning device and the bolt mounting device abut, and there are three expansion devices, which are evenly distributed on the tensioning device.

[0007] The nut mounting device is used to fix the nut. The nut is fixed by putting the nut mounting device on the nut. The bolt is fixed by connecting the bolt and the bolt mounting device. Then, the bolt mounting device is lifted by pressurizing the stretching device, so that the bolt mounting device drives the bolt to stretch. The force area of the stretching device near the bolt surface is increased by the expansion device. At the same time, the force area of the stretching device near the bolt is adjusted by the expansion device when reaching different pressure levels, so as to prevent the contact surface near the bolt from being overloaded and deformed, thereby affecting the stability of the device during the stretching process.

[0008] Furthermore, the unfolding device includes a movable plate, a return spring, a connecting block, a fixed block, a connecting plate and an unfolding plate, the movable plate and the stretching device are slidingly connected, the movable plate and the return spring are fastened together, the movable plate and the connecting block are fastened together, a fixed block is provided on the connecting block, the fixed block and the connecting block are fastened together, the fixed block and the connecting plate are rotatably connected, and the connecting plate and the unfolding plate are rotatably connected.

[0009] When the stretching device is pressurized, the moving plate is driven to move by the stretching device, and the return spring is compressed by the moving plate. The elastic potential energy of the return spring is increased by the compression of the return spring. When the stretching device is no longer pressurized, the elastic potential energy of the return spring is reset by the elastic potential energy of the return spring. The connecting block is driven to move by the movement of the moving plate, the fixed block is driven to move by the movement of the connecting block, the connecting plate is driven to move by the movement of the fixed block, and the expansion plate is driven to move by the movement of the connecting plate. As the stretching device continuously applies pressure, the expansion plate eventually moves to the contact surface. When the expansion plate moves to the contact surface between the bolt and the pressure vessel, a force is applied to the expansion plate through the connecting plate, thereby increasing the pressure area of the stretching device on the pressure vessel, thereby improving the stability of the stretching device during the stretching process. When the pressure increases, the expansion plate is expanded to continue to increase its force area, thereby ensuring the stability of the stretching device under high pressure.

[0010] Furthermore, the expansion plate includes an expansion main plate, an expansion support plate, an elastic rope, a connecting support plate, a support plate pulley and a sliding block. The sliding block is rotatably connected to the connecting plate, the sliding block is slidably connected to the expansion main plate, the expansion main plate is tightly connected to the elastic rope, the elastic rope is placed in the expansion support plate, the connecting support plate and the expansion support plate are tightly connected, the connecting support plate and the expansion main plate are slidably connected, a pulley is provided in the expansion main plate, two support plate pulleys are provided in the expansion support plate, the fixed pulley in the expansion main plate is tightly connected to the expansion main plate, and the support plate pulleys in the two expansion support plates are tightly connected to the expansion support plate.

[0011] The unfolding main board serves as the main installation basis and is used for the installation and positioning of other components. When the unfolding main board contacts the pressure vessel and the stretching device continues to apply pressure, the stretching device continues to apply pressure to make the movable plate continue to move. The movable plate continues to move, driving the connecting block to move, and the connecting block moves, driving the fixed block to move, and the fixed block moves, driving the connecting plate to move, and the connecting plate moves, and the sliding block moves, and the elastic rope moves, and the unfolding support plate is unfolded by the elastic rope. The connecting support plate and the unfolding main board are connected so that the unfolding support plate can only be unfolded toward the contact surface of the pressure vessel when unfolding. At the same time, the fixed pulley and the support plate pulley change the force direction of the elastic rope, so that the elastic rope can allow the unfolding support plate to unfold.

[0012] Furthermore, a first mounting hole, a second mounting hole, a first mounting groove, and a slider mounting groove are provided on the unfolded main board. One end of the elastic rope is fastened to the first mounting hole, the fixed pulley is placed in the second mounting hole, the fixed pulley and the elastic rope are abutted in the second mounting hole, the second mounting hole and the slider mounting groove are connected, the elastic rope away from one end of the first mounting hole is fastened to the sliding block, the sliding block is placed in the slider mounting groove, the sliding block and the slider mounting groove are slidably connected, the connecting support plate and the first mounting groove are slidably connected, and the first mounting groove is provided with a chamfered corner.

[0013] The first mounting hole provides a connection position for the elastic rope on the unfolding main board. When the elastic rope is stretched, the elastic rope stretches and drives the connecting support plate to move in the first mounting groove. The rounded corners enable the connecting support plate to rotate. The connecting support plate simultaneously rotates and moves on the first mounting groove, driving the unfolding support plate to unfold. The slider mounting groove provides a mounting position for the sliding block, and the second mounting hole provides a mounting position for the fixed pulley, so that the fixed pulley can change the force direction of the elastic rope in the second mounting hole.

[0014] Furthermore, a second mounting groove is provided on the unfolded support plate, and two support plate pulleys connected to the unfolded support plate are placed in the second mounting groove. The elastic rope is fastened to the sliding block through the first mounting hole, the second mounting groove and the second mounting hole in sequence, and the support plate pulleys and the elastic rope are abutted in the two second mounting grooves.

[0015] The second mounting groove provides an installation position for the support plate pulley, and the first mounting hole, the second mounting groove and the second mounting hole provide an installation position for the elastic rope. The elastic rope is driven to move by the movement of the sliding block, and the direction of the elastic rope is changed by the support plate pulley, so that the elastic rope can be unfolded with the support plate.

[0016] Furthermore, the stretching device is provided with a pressure hole, a pressure groove, a connecting groove and a third mounting groove, the bolt mounting device is placed in the pressure groove, the pressure hole and the pressure groove are connected, the pressure hole and the connecting groove are connected, the connecting groove and the third mounting groove are connected, the movable plate is placed in the third mounting groove, the movable plate and the third mounting groove are slidingly connected, the return spring is placed in the third mounting groove, the return spring is fastened to the third mounting groove away from one end of the movable plate, the connecting block is placed in the third mounting groove, and the connecting block and the third mounting groove are slidingly connected.

[0017] When the bolt needs to be stretched, the corresponding pressurizing equipment is connected through the pressurizing hole, and then the pressure in the pressurizing groove and the connecting groove connected to the pressurizing hole is increased. The pressure increase in the pressurizing groove causes the pressurizing groove to exert a force on the bolt mounting device, causing the bolt mounting device to lift. The bolt mounting device is lifted, and the bolt mounting device pulls the bolt. At the same time, the pressure increase in the connecting groove drives the pressure increase in the third mounting groove. The pressure increase in the third mounting groove causes the third mounting groove to exert a force on the connecting block, causing the connecting block to move downward along the third mounting groove.

[0018] Furthermore, the stretching device, the nut mounting device and the bolt mounting device are coaxially placed.

[0019] By coaxially placing the stretching device, the nut mounting device and the bolt mounting device, it is ensured that the bolt will not tilt during installation, and the possibility of the bolt tilting during stretching due to uneven force during stretching, thereby squeezing the pressure vessel and causing deformation of the pressure vessel, is reduced.

[0020] Furthermore, the bolt mounting device is provided with threads, and the threads are used for connection with the bolts.

[0021] The bolt can be connected to the thread through the thread on the bolt installation device, thereby providing an installation position and installation conditions for the bolt.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Through the linkage design of the movable plate, the main plate and the support plate, when the tensile pressure increases, the elastic rope, the support plate pulley and the fixed pulley drive the support plate to gradually expand. The contact area is dynamically enlarged as the pressure increases to avoid local overload. The three sets of uniformly distributed expansion devices act synchronously to ensure uniform circumferential force on the pressure vessel and improve tensile stability.

[0024] 2. The coaxial design of the stretching device, nut and bolt mounting components eliminates the risk of installation deviation; the linkage mechanism between the connecting groove and the pressurizing groove matches the expansion range of the deployment device with the stretching pressure. Combined with the automatic return function of the reset spring, it can achieve rapid reset after pressure unloading, thereby enhancing the recycling efficiency of the equipment.

[0025] 3. Threaded interlocking bolt installation, chamfered anti-stuck guide grooves, and redundant elastic rope control structure ensure that there is no slippage or jamming during the stretching process; the integrated stretching, centering, and reset functions simplify the operating process and significantly improve safety and work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2This is a structural schematic diagram of a nut mounting device according to the present invention;

[0028] Figure 3 for Figure 2 A magnified view of the local area A;

[0029] Figure 4 Schematic diagram of the pressure hole structure of the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the pressurized tank of the present invention;

[0031] Figure 6 It is a schematic structural diagram of the deployment device of the present invention;

[0032] Figure 7 for Figure 6 A magnified view of a part B;

[0033] Figure 8 It is a schematic diagram of the unfolded mainboard structure of the present invention.

[0034] In the figure: 1. Stretching device; 11. Pressurizing hole; 12. Pressurizing groove; 13. Connecting groove; 14. Third mounting groove; 2. Expanding device; 21. Moving plate; 22. Reset spring; 23. Connecting block; 24. Fixed block; 25. Connecting plate; 26. Expanding plate; 261. Expanding main board; 2611. First mounting hole; 2612. Second mounting hole; 2613. First mounting groove; 26131. Chamfered corner; 2614. Slider mounting groove; 262. Expanding support plate; 2621. Second mounting groove; 263. Elastic rope; 264. Connecting support plate; 265. Support plate pulley; 266. Sliding block; 3. Nut mounting device; 4. Bolt mounting device. DETAILED DESCRIPTION

[0035] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0036] Example: Figures 1-8 As shown, the present invention provides a technical solution for an adaptive centering device for a tensioning unit of a reactor bolt tensioner. The adaptive centering device includes a tensioning device 1, an expansion device 2, a nut mounting device 3 and a bolt mounting device 4. The tensioning device 1 is connected to the expansion device 2, the tensioning device 1 and the nut mounting device 3 are slidingly connected, the tensioning device 1 and the bolt mounting device 4 are abutted, there are three expansion devices 2, and the three expansion devices 2 are evenly distributed on the tensioning device 1.

[0037] The nut mounting device 3 is used to fix the nut. The nut is fixed by putting the nut mounting device 3 on the nut. The bolt is fixed by connecting the bolt and the bolt mounting device 4. Then, the bolt mounting device 4 is lifted by pressurizing the stretching device 1, so that the bolt mounting device 4 drives the bolt to stretch. The force area of the stretching device 1 near the bolt surface is increased by the unfolding device 2. At the same time, the force area of the stretching device 1 near the bolt is adjusted to different pressure levels through the unfolding device 2 to prevent the contact surface near the bolt from being overloaded and deformed, thereby affecting the stability of the device during the stretching process.

[0038] like Figure 1 、 Figure 2 、 Figure 3 and Figure 6 As shown, the unfolding device 2 includes a movable plate 21, a return spring 22, a connecting block 23, a fixed block 24, a connecting plate 25 and an unfolding plate 26. The movable plate 21 is slidingly connected to the stretching device 1, the movable plate 21 is fastened to the return spring 22, the movable plate 21 is fastened to the connecting block 23, a fixed block 24 is provided on the connecting block 23, the fixed block 24 is fastened to the connecting block 23, the fixed block 24 is rotatably connected to the connecting plate 25, and the connecting plate 25 is rotatably connected to the unfolding plate 26.

[0039] When the stretching device 1 is pressurized, the movable plate 21 is moved by the stretching device 1, and the return spring 22 is compressed by the movable plate 21. The elastic potential energy of the return spring 22 is increased by the compression of the return spring 22. When the stretching device 1 is no longer pressurized, the elastic potential energy of the return spring 22 is reset by the elastic potential energy of the return spring 22. The connecting block 23 is moved by the movement of the connecting block 23, and the fixed block 24 is moved by the movement of the connecting plate 25. The expansion plate 26 is moved by the movement of the connecting plate 25. As the stretching device 1 continuously pressurizes the expansion plate 26, it eventually moves to the contact surface. When the expansion plate 26 moves to the contact surface between the bolt and the pressure vessel, a force is applied to the expansion plate 26 through the connecting plate 25, thereby increasing the pressure area of the stretching device 1 on the pressure vessel, thereby improving the stability of the stretching device 1 during the stretching process. When the pressure increases, the expansion plate 26 is expanded to continue to increase its force area, thereby ensuring the stability of the stretching device 1 under high pressure.

[0040] like Figure 6 and Figure 7As shown, the unfolding plate 26 includes an unfolding main plate 261, an unfolding support plate 262, an elastic rope 263, a connecting support plate 264, a support plate pulley 265 and a sliding block 266. The sliding block 266 is rotatably connected to the connecting plate 25, the sliding block 266 is slidingly connected to the unfolding main plate 261, the unfolding main plate 261 and the elastic rope 263 are fastened together, the elastic rope 263 is placed in the unfolding support plate 262, the connecting support plate 264 and the unfolding support plate 262 are fastened together, the connecting support plate 264 and the unfolding main plate 261 are slidingly connected, a pulley is provided in the unfolding main plate 261, two support plate pulleys 265 are provided in the unfolding support plate 262, the fixed pulley in the unfolding main plate 261 is fastened together with the unfolding main plate 261, and the support plate pulleys 265 in the two unfolding support plates 262 are fastened together with the unfolding support plate 262.

[0041] The unfolding main board 261 serves as the main installation base and is used for the installation and positioning of other components. When the unfolding main board 261 contacts the pressure vessel and the stretching device 1 continues to apply pressure, the stretching device 1 continues to apply pressure to make the movable plate 21 continue to move, and the movable plate 21 continues to move, driving the connecting block 23 to move, and the connecting block 23 moves, driving the fixed block 24 to move, and the fixed block 24 moves, driving the connecting plate 25 to move, and the connecting plate 25 moves, and the sliding block 266 moves, and the elastic rope 263 moves, and the unfolding support plate 262 is unfolded by the elastic rope 263. The connecting support plate 264 is connected to the unfolding main board 261, so that the unfolding support plate 262 can only be unfolded toward the contact surface of the pressure vessel when unfolding. At the same time, the fixed pulley and the support plate pulley 265 change the force direction of the elastic rope 263, so that the elastic rope 263 can allow the unfolding support plate 262 to unfold.

[0042] like Figure 7 and Figure 8 As shown, the unfolded main board 261 is provided with a first mounting hole 2611, a second mounting hole 2612, a first mounting groove 2613, and a slider mounting groove 2614. One end of the elastic rope 263 is fastened to the first mounting hole 2611, the fixed pulley is placed in the second mounting hole 2612, the fixed pulley and the elastic rope 263 are abutted in the second mounting hole 2612, the second mounting hole 2612 and the slider mounting groove 2614 are communicated, the end of the elastic rope 263 away from the first mounting hole 2611 is fastened to the sliding block 266, the sliding block 266 is placed in the slider mounting groove 2614, the sliding block 266 and the slider mounting groove 2614 are slidably connected, the connecting support plate 264 and the first mounting groove 2613 are slidably connected, and the first mounting groove 2613 is provided with a chamfered corner 26131.

[0043] The first mounting hole 2611 provides a connection position for the elastic rope 263 on the unfolding main board 261. When the elastic rope 263 is stretched, the stretching of the elastic rope 263 drives the connecting support plate 264 to move in the first mounting groove 2613. The rounded corners 26131 allow the connecting support plate 264 to rotate. The connecting support plate 264 simultaneously rotates and moves on the first mounting groove 2613, driving the unfolding support plate 262 to unfold. The slider mounting groove 2614 provides a mounting position for the sliding block 266. At the same time, the second mounting hole 2612 provides a mounting position for the fixed pulley, so that the fixed pulley can change the force direction of the elastic rope 263 in the second mounting hole 2612.

[0044] like Figure 7 and Figure 8 As shown, a second mounting groove 2621 is provided on the unfolded support plate 262, and two support plate pulleys 265 connected to the unfolded support plate 262 are placed in the second mounting groove 2621. The elastic rope 263 is fastened to the sliding block 266 through the first mounting hole 2611, the second mounting groove 2621 and the second mounting hole 2612 in sequence, and the support plate pulleys 265 and the elastic rope 263 are abutted in the two second mounting grooves 2621.

[0045] The second mounting groove 2621 provides an installation position for the support plate pulley 265. At the same time, the first mounting hole 2611, the second mounting groove 2621 and the second mounting hole 2612 provide an installation position for the elastic rope 263. The elastic rope 263 is driven to move by the sliding block 266, and the direction of the elastic rope 263 is changed by the support plate pulley 265, so that the elastic rope 263 can be unfolded with the support plate 262.

[0046] like Figure 1 、 Figure 2 and Figure 4 As shown, the stretching device 1 is provided with a pressure hole 11, a pressure groove 12, a connecting groove 13 and a third mounting groove 14, the bolt mounting device 4 is placed in the pressure groove 12, the pressure hole 11 and the pressure groove 12 are connected, the pressure hole 11 and the connecting groove 13 are connected, the connecting groove 13 and the third mounting groove 14 are connected, the movable plate 21 is placed in the third mounting groove 14, the movable plate 21 and the third mounting groove 14 are slidingly connected, the return spring 22 is placed in the third mounting groove 14, the return spring 22 is away from the end of the movable plate 21 and is fastened to the third mounting groove 14, the connecting block 23 is placed in the third mounting groove 14, and the connecting block 23 and the third mounting groove 14 are slidingly connected.

[0047] When the bolt needs to be stretched, the corresponding pressurizing equipment is connected through the pressurizing hole 11, and then the pressure in the pressurizing groove 12 and the connecting groove 13 connected to the pressurizing hole 11 is increased. The pressure increase in the pressurizing groove 12 causes the pressurizing groove 12 to exert a force on the bolt mounting device 4, causing the bolt mounting device 4 to lift. The bolt mounting device 4 is lifted, and the bolt mounting device 4 pulls the bolt. At the same time, the pressure increase in the connecting groove 13 drives the pressure increase in the third mounting groove 14. The pressure increase in the third mounting groove 14 causes the third mounting groove 14 to exert a force on the connecting block 23, thereby causing the connecting block 23 to move downward along the third mounting groove 14.

[0048] like Figure 1 、 Figure 2 and Figure 4 As shown, the tensioning device 1, the nut mounting device 3 and the bolt mounting device 4 are coaxially placed.

[0049] By coaxially placing the stretching device 1, the nut mounting device 3 and the bolt mounting device 4, it is ensured that the bolt will not tilt during installation, and the possibility of the bolt tilting during stretching due to uneven force during stretching, thereby squeezing the pressure vessel and causing deformation of the pressure vessel, is reduced.

[0050] like Figure 1 、 Figure 2 and Figure 4 As shown, the bolt mounting device 4 is provided with threads for connection with the bolts.

[0051] The bolts can be connected to the threads through the threads on the bolt installation device 4, thereby providing installation positions and installation conditions for the bolts.

[0052] The working principle of the present invention is as follows: when the stretching device 1 is pressurized, the moving plate 21 is driven to move by the stretching device 1, and the return spring 22 is compressed by the moving plate 21. The elastic potential energy of the return spring 22 is increased by the compression of the return spring 22. When the stretching device 1 is no longer pressurized, the elastic potential energy of the return spring 22 is reset by the elastic potential energy of the return spring 22. The connecting block 23 is driven to move by the movement of the moving plate 21, and the fixed block 24 is driven to move by the movement of the connecting block 23. The connecting plate 25 is driven to move by the movement of the fixed block 24, and the expansion plate 26 is driven to move by the movement of the connecting plate 25. As the stretching device 1 continuously applies pressure, the expansion plate 26 eventually moves to the contact surface. When the expansion plate 26 moves to the contact surface between the bolt and the pressure vessel, a force is applied to the expansion plate 26 through the connecting plate 25, thereby increasing the pressure of the stretching device 1 on the pressure vessel. The pressure area of the device is increased, thereby improving the stability of the stretching device 1 during the stretching process. When the stretching pressure continues to increase, the elastic rope 263 is moved by the movement of the sliding block 266, and the connecting support plate 264 is driven to move in the first mounting groove 2613 through the stretching of the elastic rope 263. The connecting support plate 264 can be rotated by the chamfered corner 26131. The connecting support plate 264 is simultaneously rotated and moved on the first mounting groove 2613, driving the expansion support plate 262 to expand, and can only expand toward the contact surface of the pressure vessel. At the same time, the force direction of the elastic rope 263 is changed by the support plate pulley 265 and the fixed pulley, so that the elastic rope 263 can allow the expansion support plate 262 to expand. By expanding the expansion support plate 262, its force area is further increased, thereby ensuring the stability of the stretching device 1 under high pressure.

[0053] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An adaptive centering device for a tensioning unit of a reactor bolt tensioner, characterized by: The adaptive centering device comprises a stretching device (1), an unfolding device (2), a nut mounting device (3) and a bolt mounting device (4); the stretching device (1) and the unfolding device (2) are connected; the stretching device (1) and the nut mounting device (3) are slidably connected; the stretching device (1) and the bolt mounting device (4) are in abutment; there are three unfolding devices (2), and the three unfolding devices (2) are evenly distributed on the stretching device (1).

2. The adaptive centering device for a tensioning unit of a reactor bolt tensioner according to claim 1, characterized in that: The unfolding device (2) comprises a movable plate (21), a return spring (22), a connecting block (23), a fixed block (24), a connecting plate (25) and an unfolding plate (26); the movable plate (21) is slidably connected to the stretching device (1); the movable plate (21) is fixedly connected to the return spring (22); the movable plate (21) is fixedly connected to the connecting block (23); a fixed block (24) is provided on the connecting block (23); the fixed block (24) is fixedly connected to the connecting block (23); the fixed block (24) is rotatably connected to the connecting plate (25); and the connecting plate (25) is rotatably connected to the unfolding plate (26).

3. The adaptive centering device for a tensioning unit of a reactor bolt tensioner according to claim 2, characterized in that: The unfolding plate (26) comprises an unfolding main plate (261), an unfolding support plate (262), an elastic rope (263), a connecting support plate (264), a support plate pulley (265) and a sliding block (266); the sliding block (266) and the connecting plate (25) are rotatably connected; the sliding block (266) and the unfolding main plate (261) are slidably connected; the unfolding main plate (261) and the elastic rope (263) are tightly connected; the elastic rope (263) is placed inside the unfolding support plate (262). The connecting support plate (264) and the unfolding support plate (262) are tightly connected, the connecting support plate (264) and the unfolding main plate (261) are slidingly connected, a fixed pulley is provided in the unfolding main plate (261), two support plate pulleys (265) are provided in the unfolding support plate (262), the fixed pulley in the unfolding main plate (261) and the unfolding main plate (261) are tightly connected, and the support plate pulleys (265) in the two unfolding support plates (262) and the unfolding support plate (262) are tightly connected.

4. The adaptive centering device for a tensioning unit of a reactor bolt tensioner according to claim 3, characterized in that: The unfolding main board (261) is provided with a first mounting hole (2611), a second mounting hole (2612), a first mounting slot (2613), and a slider mounting slot (2614); one end of the elastic rope (263) is fastened to the first mounting hole (2611); the fixed pulley is placed in the second mounting hole (2612); the fixed pulley and the elastic rope (263) are in contact in the second mounting hole (2612); the second mounting hole (2612) and the slider are in contact. The mounting groove (2614) is connected, and one end of the elastic rope (263) away from the first mounting hole (2611) is fastened to the sliding block (266). The sliding block (266) is placed in the slider mounting groove (2614). The sliding block (266) and the slider mounting groove (2614) are slidably connected. The connecting support plate (264) and the first mounting groove (2613) are slidably connected. The first mounting groove (2613) is provided with a chamfered corner (26131).

5. The adaptive centering device for a tensioning unit of a reactor bolt tensioner according to claim 4, characterized in that: The unfolded support plate (262) is provided with a second mounting groove (2621), and the two support plate pulleys (265) connected to the unfolded support plate (262) are placed in the second mounting groove (2621). The elastic rope (263) is fastened to the sliding block (266) through the first mounting hole (2611), the second mounting groove (2621) and the second mounting hole (2612) in sequence, and the support plate pulleys (265) and the elastic rope (263) are in contact with each other in the two second mounting grooves (2621).

6. The adaptive centering device for a tensioning unit of a reactor bolt tensioner according to claim 2, characterized in that: The stretching device (1) is provided with a pressure hole (11), a pressure groove (12), a connecting groove (13) and a third mounting groove (14); the bolt mounting device (4) is placed in the pressure groove (12); the pressure hole (11) and the pressure groove (12) are communicated; the pressure hole (11) and the connecting groove (13) are communicated; the connecting groove (13) and the third mounting groove (14) are communicated; the movable plate (21) is placed in the third mounting groove (14); the movable plate (21) and the third mounting groove (14) are slidably connected; the return spring (22) is placed in the third mounting groove (14); the return spring (22) is fastened to the third mounting groove (14) at one end away from the movable plate (21); the connecting block (23) is placed in the third mounting groove (14); the connecting block (23) and the third mounting groove (14) are slidably connected.

7. The adaptive centering device for a tensioning unit of a reactor bolt tensioner according to claim 1, characterized in that: The stretching device (1), the nut mounting device (3) and the bolt mounting device (4) are coaxially arranged.

8. The adaptive centering device for a tensioning unit of a reactor bolt tensioner according to claim 1, characterized in that: The bolt mounting device (4) is provided with a thread, and the thread is used for connection with the bolt.

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