An adaptive centering device for a reactor bolt stretcher stretching unit

Abstract

The application discloses a self-adaptive centering device for a stretching unit of a reactor bolt stretcher, relates to the technical field of bolt stretchers, and discloses a self-adaptive centering device for a stretching unit of a reactor bolt stretcher, which comprises a stretching device, unfolding devices, a nut mounting device and a bolt mounting device. The stretching device is connected with the unfolding devices, and the stretching device and the nut mounting device are slidably connected. The stretching device and the bolt mounting device abut against each other. The three unfolding devices are uniformly distributed on the stretching device. The nut mounting device is used for fixing the nuts. The bolt is connected with the bolt mounting device to be fixed, and then the bolt mounting device is lifted by applying pressure to the stretching device, so that the bolt mounting device drives the bolt to stretch. The unfolding devices increase the force receiving area of the stretching device near the surface of the bolt.

Description

Technical Field

[0001] This invention relates to the field of bolt tensioning machine technology, specifically an adaptive centering device for the tensioning unit of a reactor bolt tensioning machine. Background Technology

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

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

[0004] The purpose of this invention is to provide an adaptive alignment device for the tensioning unit of a reactor bolt tensioning machine, so as to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A technical solution for an adaptive centering device for a reactor bolt tensioning machine tensioning unit. The adaptive centering device includes a tensioning device, a unfolding device, a nut mounting device, and a bolt mounting device. The tensioning device and the unfolding device are connected, the tensioning device and the nut mounting device are slidably connected, and the tensioning device and the bolt mounting device abut against each other. There are three unfolding devices, which are evenly distributed on the tensioning device.

[0007] The nut mounting device is used to fix the nut. By fitting the nut mounting device onto the nut, the nut is secured. By connecting the bolt and the bolt mounting device, the bolt is fixed. Then, by applying pressure to the tensioning device, the bolt mounting device is lifted, causing the bolt mounting device to stretch the bolt. The unfolding device increases the force-bearing area near the bolt surface of the tensioning device. At the same time, the unfolding device allows the tensioning device to reach different pressure levels near the bolt, preventing overload on the contact surface near the bolt, which could cause deformation and affect 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 slidably connected. The movable plate and the return spring are fastened together. The movable plate and the connecting block are fastened together. The connecting block is provided with a fixed block. The fixed block and the connecting block are fastened together. The fixed block and the connecting plate are rotatably connected. The connecting plate and the unfolding plate are rotatably connected.

[0009] When pressure is applied to the tensioning device, the moving plate moves, which in turn compresses the return spring. This compression increases the spring's elastic potential energy. When the tensioning device is no longer pressurized, the spring's elastic potential energy resets other components. The moving plate moves the connecting block, which in turn moves the fixing block, which in turn moves the connecting plate, which in turn moves the unfolding plate. As the tensioning device continues to apply pressure, the unfolding plate eventually moves to the contact surface. When the unfolding plate reaches the contact surface between the bolt and the pressure vessel, the connecting plate applies force to it, increasing the pressure area of ​​the tensioning device on the pressure vessel and thus improving its stability during the tensioning process. As the pressure increases, the unfolding plate expands, further increasing its bearing area and ensuring the stability of the tensioning device under high pressure.

[0010] Furthermore, the unfolding plate includes an unfolding main plate, unfolding support plates, elastic ropes, connecting support plates, support plate pulleys, and sliding blocks. The sliding blocks and connecting plates are rotatably connected, the sliding blocks and unfolding main plates are slidably connected, the unfolding main plate and elastic ropes are fastened together, the elastic ropes are placed inside the unfolding support plates, the connecting support plates and unfolding support plates are fastened together, the connecting support plates and unfolding main plates are slidably connected, the unfolding main plate is equipped with pulleys, the unfolding support plates are equipped with two support plate pulleys, the fixed pulley inside the unfolding main plate is fastened together, and the support plate pulleys inside the two unfolding support plates are fastened together.

[0011] The main board serves as the primary mounting base for positioning other components. When the main board contacts the pressure vessel, the tensioning device continues to apply pressure, causing the moving plate to move. This movement drives the connecting block, which in turn moves the fixed block, which in turn moves the connecting plate. The sliding block then moves the elastic rope, which in turn causes the unfolding support plate to unfold. The connection between the support plate and the main board ensures that the support plate can only unfold towards the pressure vessel's contact surface. Simultaneously, the fixed pulley and support plate pulley alter the direction of force on the elastic rope, allowing it to unfold the support plate.

[0012] Furthermore, the main board is provided with a first mounting hole, a second mounting hole, a first mounting groove, and a slider mounting groove. One end of the elastic rope is fastened to the first mounting hole. The fixed pulley is placed in the second mounting hole, and the fixed pulley and the elastic rope abut against each other in the second mounting hole. The second mounting hole and the slider mounting groove are connected. The end of the elastic rope away from the first mounting hole is fastened to the sliding block. The sliding block is placed in the slider mounting groove, and the sliding block and the slider mounting groove are slidably connected. The connecting support plate is slidably connected to the first mounting groove. The first mounting groove is provided with rounded corners.

[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 stretching of the elastic rope drives the connecting support plate to move in the first mounting groove. The rounded corners allow the connecting support plate to rotate. The simultaneous rotation and movement of the connecting support plate in the first mounting groove drives 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, allowing the fixed pulley to change the direction of force on the elastic rope within the second mounting hole.

[0014] Furthermore, the unfolding support plate is provided with a second mounting groove, and two support plate pulleys connected to the unfolding support plate are placed in the second mounting groove. The elastic rope passes through the first mounting hole, the second mounting groove and the second mounting hole in sequence and is fastened to the sliding block. The support plate pulleys and the elastic rope in the two second mounting grooves abut against each other.

[0015] The second mounting slot provides an installation position for the support plate pulley, while the first mounting hole, the second mounting slot, and the second mounting hole provide an installation position for the elastic rope. The movement of the sliding block drives the movement of the elastic rope, and the support plate pulley changes the direction of the elastic rope, allowing the elastic rope to unfold the support plate.

[0016] Furthermore, the tensioning 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 moving plate is placed in the third mounting groove and is slidably connected to the third mounting groove. The return spring is placed in the third mounting groove. The end of the return spring away from the moving plate is fastened to the third mounting groove. The connecting block is placed in the third mounting groove and is slidably connected to the third mounting groove.

[0017] When the bolt needs to be stretched, the corresponding pressurizing device is connected through the pressurizing hole, which increases the pressure in the pressurizing groove and connecting groove connected to the pressurizing hole. The increased pressure in the pressurizing groove exerts a force on the bolt mounting device, causing the bolt mounting device to lift. The lifting of the bolt mounting device causes the bolt mounting device to pull the bolt. At the same time, the increased pressure in the connecting groove drives the increased pressure in the third mounting groove. The increased pressure in the third mounting groove exerts a force on the connecting block, causing the connecting block to move downward along the third mounting groove.

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

[0019] By placing the tensioning device, nut installation device, and bolt installation device coaxially, it is ensured that the bolt will not tilt during installation, reducing the possibility that uneven force on the bolt during tensioning could cause it to tilt and compress the pressure vessel, leading to deformation.

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

[0021] The threads on the bolt mounting device allow the bolt to connect with the threads, thus providing the bolt with the installation position and conditions.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. Through the linkage design of the moving plate, the unfolding main plate and the unfolding support plate, when the tensile pressure increases, the elastic rope, the support plate pulley and the fixed pulley drive the unfolding support plate to gradually expand. The contact area dynamically increases with the increase of pressure, avoiding local overload. The three sets of evenly distributed unfolding devices work synchronously to ensure that the pressure vessel is subjected to uniform force in the circumference and improve tensile stability.

[0024] 2. The tensioning device, nut and bolt mounting components are designed to be coaxial, eliminating the risk of installation misalignment; the linkage mechanism between the connecting groove and the pressure groove matches the expansion range of the unfolding device with the tensioning pressure, and combined with the automatic return function of the return spring, it can quickly reset after pressure is unloaded, enhancing the efficiency of equipment recycling.

[0025] 3. The threaded engagement bolt installation, rounded corner anti-jamming guide groove, and redundant elastic rope control structure ensure that there is no slippage or jamming during the stretching process; the stretching, centering, and reset functions are integrated into one, simplifying the operation process and significantly improving safety and work efficiency. Attached Figure Description

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

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

[0028] Figure 3 for Figure 2 A magnified view of part A;

[0029] Figure 4 This is a schematic diagram of the pressure hole structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the pressure groove structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the unfolding device of the present invention;

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

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

[0034] In the diagram: 1. Tensioning device; 11. Pressure hole; 12. Pressure groove; 13. Connecting groove; 14. Third mounting groove; 2. Unfolding device; 21. Moving plate; 22. Return spring; 23. Connecting block; 24. Fixing block; 25. Connecting plate; 26. Unfolding plate; 261. Unfolding main plate; 2611. First mounting hole; 2612. Second mounting hole; 2613. First mounting groove; 26131. ​​Rounded corner; 2614. Slider mounting groove; 262. Unfolding 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 Implementation

[0035] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0036] Example: Figures 1-8 As shown, the present invention provides an adaptive centering device for a reactor bolt tensioning machine tensioning unit. The adaptive centering device includes a tensioning device 1, an unfolding device 2, a nut mounting device 3, and a bolt mounting device 4. The tensioning device 1 and the unfolding device 2 are connected, the tensioning device 1 and the nut mounting device 3 are slidably connected, and the tensioning device 1 and the bolt mounting device 4 abut against each other. There are three unfolding devices 2, which are evenly distributed on the tensioning device 1.

[0037] The nut mounting device 3 is used to fix the nut. By fitting the nut mounting device 3 onto the nut, the nut is fixed. By connecting the bolt and the bolt mounting device 4, the bolt is fixed. Then, by applying pressure to the tensioning device 1, the bolt mounting device 4 is lifted, causing the bolt mounting device 4 to pull the bolt to stretch. The unfolding device 2 increases the force-bearing area of ​​the tensioning device 1 near the bolt surface. At the same time, the unfolding device 2 allows the tensioning device 1 to reach different pressure levels near the bolt, preventing overload on the contact surface near the bolt, which would cause deformation and affect 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 fixing 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 fastened to the return spring 22, the movable plate 21 is fastened to the connecting block 23, the connecting block 23 is provided with a fixing block 24, the fixing block 24 is fastened to the connecting block 23, the fixing 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 tensioning device 1 is pressurized, the tensioning device 1 drives the moving plate 21 to move, which in turn compresses the return spring 22. The compression of the return spring 22 increases its elastic potential energy. When the tensioning device 1 stops pressurizing, the elastic potential energy of the return spring 22 resets the other components. The movement of the moving plate 21 drives the connecting block 23 to move, which in turn drives the fixing block 24 to move, which in turn drives the connecting plate 25 to move, which in turn drives the unfolding plate 26 to move. As the tensioning device 1 continues to pressurize, the unfolding plate 26 eventually moves to the contact surface. When the unfolding plate 26 moves to the contact surface between the bolt and the pressure vessel, the connecting plate 25 applies a force to the unfolding plate 26, increasing the pressure area of ​​the tensioning device 1 on the pressure vessel, thereby improving the stability of the tensioning device 1 during the tensioning process. When the pressure increases, the unfolding plate 26 unfolds, further increasing its bearing area and ensuring the stability of the tensioning 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, support plate pulleys 265, and a sliding block 266. The sliding block 266 is rotatably connected to the connecting plate 25, and the sliding block 266 is slidably connected to the unfolding main plate 261. The unfolding main plate 261 is fastened to the elastic rope 263, which is placed inside the unfolding support plate 262. The connecting support plate 264 is fastened to the unfolding support plate 262, and the connecting support plate 264 is slidably connected to the unfolding main plate 261. The unfolding main plate 261 is provided with a pulley, and the unfolding support plate 262 is provided with two support plate pulleys 265. The fixed pulley inside the unfolding main plate 261 is fastened to the unfolding main plate 261, and the support plate pulleys 265 inside the two unfolding support plates 262 are fastened to the unfolding support plates 262.

[0041] The main board 261 serves as the primary mounting base for positioning other components. When the main board 261 contacts the pressure vessel, and the tensioning device 1 continues to apply pressure, the moving plate 21 continues to move. This movement of the moving plate 21 moves the connecting block 23, which in turn moves the fixing block 24, which in turn moves the connecting plate 25. The moving plate 25 then moves the sliding block 266, which in turn moves the elastic rope 263. This movement of the elastic rope 263 then unfolds the unfolding support plate 262. The connecting support plate 264 connects to the main board 261, ensuring that the unfolding support plate 262 can only unfold towards the pressure vessel's contact surface. Simultaneously, the fixed pulley and support plate pulley 265 alter the direction of force on the elastic rope 263, allowing the elastic rope 263 to facilitate the unfolding of the support plate 262.

[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, and the fixed pulley and the elastic rope 263 abut against each other in the second mounting hole 2612. The second mounting hole 2612 and the slider mounting groove 2614 are connected. 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, and the sliding block 266 and the slider mounting groove 2614 are slidably connected. The connecting support plate 264 is slidably connected to the first mounting groove 2613. The first mounting groove 2613 is provided with a rounded 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 within the first mounting groove 2613. The rounded corner 26131 allows the connecting support plate 264 to rotate. The simultaneous rotation and movement of the connecting support plate 264 within the first mounting groove 2613 drives the unfolding support plate 262 to unfold. The slider mounting groove 2614 provides a mounting position for the sliding block 266, and the second mounting hole 2612 provides a mounting position for the fixed pulley, allowing the fixed pulley to change the direction of force on the elastic rope 263 within the second mounting hole 2612.

[0044] like Figure 7 and Figure 8 As shown, the unfolding support plate 262 is provided with a second mounting groove 2621. Two support plate pulleys 265 connected to the unfolding support plate 262 are placed in the second mounting groove 2621. The elastic rope 263 passes through the first mounting hole 2611, the second mounting groove 2621 and the second mounting hole 2612 in sequence and is fastened to the sliding block 266. The support plate pulleys 265 and the elastic rope 263 abut 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 movement of the sliding block 266 drives the elastic rope 263 to move. The support plate pulley 265 changes the direction of the elastic rope 263, so that the elastic rope 263 can unfold the support plate 262.

[0046] like Figure 1 , Figure 2 and Figure 4 As shown, the tensioning 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 moving plate 21 is placed in the third mounting groove 14 and is slidably connected to the moving plate 21. The return spring 22 is placed in the third mounting groove 14 and the end of the return spring 22 away from the moving plate 21 is fastened to the third mounting groove 14. The connecting block 23 is placed in the third mounting groove 14 and is slidably connected to the third mounting groove 14.

[0047] When the bolt needs to be stretched, the corresponding pressurizing device is connected through the pressurizing hole 11, which increases the pressure in the pressurizing groove 12 and the connecting groove 13 connected to the pressurizing hole 11. The increased pressure in the pressurizing groove 12 exerts a force on the bolt mounting device 4, causing the bolt mounting device 4 to lift. The lifting of the bolt mounting device 4 causes the bolt mounting device 4 to pull the bolt. At the same time, the increased pressure in the connecting groove 13 drives the increased pressure in the third mounting groove 14. The increased pressure in the third mounting groove 14 exerts a force on the connecting block 23, 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 placed coaxially.

[0049] By placing the tensioning device 1, the nut mounting device 3, and the bolt mounting device 4 coaxially, it is ensured that the bolt will not tilt during installation, reducing the possibility that uneven force on the bolt during tensioning could cause it to tilt and thus compress the pressure vessel, leading to deformation.

[0050] like Figure 1 , Figure 2 and Figure 4 As shown, the bolt mounting device 4 is provided with threads, which are used to connect with bolts.

[0051] The threads on the bolt mounting device 4 allow the bolt to be connected to the threads, thus providing the bolt with an installation position and installation conditions.

[0052] The working principle of this invention is as follows: When the tensioning device 1 is pressurized, the tensioning device 1 drives the moving plate 21 to move, which in turn compresses the return spring 22. This compression increases the elastic potential energy of the return spring 22. When the tensioning device 1 stops pressurizing, the elastic potential energy of the return spring 22 resets other components. The movement of the moving plate 21 causes the connecting block 23 to move, which in turn causes the fixing block 24 to move, which in turn causes the connecting plate 25 to move, which in turn causes the unfolding plate 26 to move. As the tensioning device 1 continuously pressurizes, the unfolding plate 26 eventually moves to the contact surface. When the unfolding plate 26 reaches the contact surface between the bolt and the pressure vessel, the connecting plate 25 applies a force to the unfolding plate 26, increasing the pressure exerted by the tensioning device 1 on the pressure vessel. The pressure area of ​​the device is increased, thereby improving the stability of the tensioning device 1 during the tensioning process. When the tensioning pressure continues to increase, the movement of the sliding block 266 drives the movement of the elastic rope 263. The tension of the elastic rope 263 drives the connecting support plate 264 to move within the first mounting groove 2613. The rounded corner 26131 allows the connecting support plate 264 to rotate. The simultaneous rotation and movement of the connecting support plate 264 on the first mounting groove 2613 drives the unfolding support plate 262 to unfold. It can only unfold towards 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 unfolding support plate 262 to unfold. The unfolding support plate 262 further increases its force-bearing area, ensuring the stability of the tensioning 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An adaptive centering device for a reactor bolt stretcher stretching unit, characterized by: The self-adapting 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 slidingly connected, the stretching device (1) and the bolt mounting device (4) are abutted, the unfolding device (2) is three, and the three unfolding devices (2) are uniformly distributed on the stretching device (1); The unfolding device (2) comprises a moving plate (21), a reset spring (22), a connecting block (23), a fixed block (24), a connecting plate (25) and an unfolding plate (26), the moving plate (21) and the stretching device (1) are slidingly connected, the moving plate (21) and the reset spring (22) are fixedly connected, the moving plate (21) and the connecting block (23) are fixedly connected, the connecting block (23) is provided with the fixed block (24), the fixed block (24) and the connecting block (23) are fixedly connected, the fixed block (24) and the connecting plate (25) are rotatably connected, and the connecting plate (25) and the unfolding plate (26) are rotatably connected; The unfolding plate (26) comprises an unfolding main plate (261), an unfolding branch plate (262), an elastic rope (263), a connecting branch plate (264), a branch 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 slidingly connected, the unfolding main plate (261) and the elastic rope (263) are fixedly connected, the elastic rope (263) is arranged in the unfolding branch plate (262), the connecting branch plate (264) and the unfolding branch plate (262) are fixedly connected, the connecting branch plate (264) and the unfolding main plate (261) are slidingly connected, the unfolding main plate (261) is provided with a fixed pulley, the unfolding branch plate (262) is provided with two branch plate pulleys (265), the fixed pulley in the unfolding main plate (261) and the unfolding main plate (261) are fixedly connected, and the two branch plate pulleys (265) in the unfolding branch plate (262) and the unfolding branch plate (262) are fixedly connected; The first mounting hole (2611), the second mounting hole (2612), the first mounting slot (2613), and the sliding block mounting slot (2614) are arranged on the unfolding main plate (261), one end of the elastic rope (263) is fixedly connected with the first mounting hole (2611), the fixed pulley is arranged in the second mounting hole (2612), the fixed pulley in the second mounting hole (2612) abuts against the elastic rope (263), the second mounting hole (2612) is communicated with the sliding block mounting slot (2614), one end of the elastic rope (263) away from the first mounting hole (2611) is fixedly connected with the sliding block (266), the sliding block (266) is arranged in the sliding block mounting slot (2614), the sliding block (266) is slidably connected with the sliding block mounting slot (2614), the connecting branch plate (264) is slidably connected with the first mounting slot (2613), and the first mounting slot (2613) is provided with a rounded corner (26131). The stretching device (1), the nut mounting device (3) and the bolt mounting device (4) are coaxially arranged. The bolt mounting device (4) is provided with a thread, and the thread is used for connecting with a bolt.

2. The self-aligning centering device for a reactor bolt stretcher stretching unit according to claim 1, characterized in that: The second mounting slot (2621) is arranged on the unfolding branch plate (262), the two branch plate pulleys (265) connected with the unfolding branch plate (262) are arranged in the second mounting slot (2621), the elastic rope (263) is fixedly connected with the sliding block (266) in sequence through the first mounting hole (2611), the second mounting slot (2621) and the second mounting hole (2612), and the two branch plate pulleys (265) in the second mounting slot (2621) abut against the elastic rope (263).

3. The self-aligning centering device for a reactor bolt stretcher stretching unit of claim 1, characterized in that: The stretching device (1) is provided with a pressurizing hole (11), a pressurizing slot (12), a connecting slot (13) and a third mounting slot (14), the bolt mounting device (4) is arranged in the pressurizing slot (12), the pressurizing hole (11) is communicated with the pressurizing slot (12), the pressurizing hole (11) is communicated with the connecting slot (13), the connecting slot (13) is communicated with the third mounting slot (14), the moving plate (21) is arranged in the third mounting slot (14), the moving plate (21) is slidably connected with the third mounting slot (14), the reset spring (22) is arranged in the third mounting slot (14), one end of the reset spring (22) away from the moving plate (21) is fixedly connected with the third mounting slot (14), and the connecting block (23) is arranged in the third mounting slot (14).

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