A clamping tool for spot welding of a steel lining of a nuclear power plant

Abstract

The present application relates to the field of welding tooling, and discloses a clamping tool for spot welding of a steel lining of a nuclear power plant, which comprises a base, a mounting bottom plate is detachably mounted at the middle of the top end of the base, a central support seat is arranged at the middle of the top end of the mounting bottom plate, arc-shaped grooves are formed at the two sides of the surface of the mounting bottom plate, an extension seat is welded to the side wall of the base, a drive motor is fixed to one side of the top end of the extension seat, a first screw rod is connected to the output end of the drive motor, and a threaded sleeve is arranged on the outer side of the first screw rod. Through the first screw rod, the threaded sleeve, the pull rod, the sliding block, the guide rod and other structures, the adjustment of the welding point of the steel lining can be realized according to the actual welding requirement when the steel lining is welded, the whole moving seat can move in an arc shape under the action of the pull rod, the position of the welding head can be kept constant during welding, the accuracy of welding is improved, and the whole is more practical.

Description

Technical Field

[0001] This invention relates to the field of welding fixture technology, specifically a clamping fixture for spot welding of steel linings in nuclear power plants. Background Technology

[0002] The steel liner of the containment vessel of a nuclear power plant is the core safety barrier of the nuclear island and belongs to the first-level critical structure of nuclear safety. It is mainly composed of large-size thin-walled carbon steel plates assembled in sections. It has the core functions of bearing pressure, preventing seepage, and blocking nuclear radiation. Its assembly and welding quality directly determines the overall operational safety and service life of the nuclear power plant. The construction of the steel liner is divided into two major stages: factory prefabrication and on-site overall assembly. Spot welding is a key preliminary process for the assembly of steel liner sections and the assembly of circumferential and vertical seams. It is necessary to ensure that the gaps between the plates are uniform, the verticality of the plate surface meets the standards, and the overall curvature is accurate. At the same time, the assembly stress and welding deformation must be strictly controlled. The positioning accuracy, clamping stability, adaptability and anti-deformation ability of the tooling have extremely high industry standard requirements.

[0003] In the current construction of spot welding assembly of steel linings for nuclear power plants, the clamping tools used are mostly traditional simple fixed clamps and manual clamping buckle structures. During construction, tower crane hoisting and positioning and manual temporary support are used to complete the plate assembly and spot welding operations.

[0004] The inventors of this application discovered in their research that the core defect of the aforementioned prior art lies in the following: In the prefabrication process of steel lining in nuclear power plants, it is necessary to first reliably clamp and position the assembled steel lining plates using clamping fixtures before spot welding is carried out to pre-fix the plates. Since the end of the steel lining is a continuous arc-shaped curved surface structure, and the clamping fixtures currently used are mostly fixed structures, the fixtures themselves and the clamping points cannot be flexibly adjusted according to the curved surface shape. Due to this limitation, when operators perform spot welding in the curved area, they must repeatedly move and deflect the welding head, constantly correcting the position of the welding gun and the welding angle, in order to complete the welding of the entire weld along the arc-shaped plate surface. This method of repeatedly adjusting the welding gun not only significantly increases the workload of on-site operations, causing a waste of manpower and time, but also easily leads to operational deviations due to frequent manual movement, resulting in welding trajectory deviations and irregular weld formation, directly reducing the accuracy of spot welding and splicing quality. Summary of the Invention

[0005] This invention provides a clamping fixture for spot welding of steel linings in nuclear power plants, which solves the problem that existing clamping fixtures cannot adjust the angle of the steel lining according to actual welding requirements. It enables flexible adjustment of the position of the steel lining during welding, thereby improving the welding accuracy and stability of the curved surface of the steel lining.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a clamping fixture for spot welding of steel linings in nuclear power plants, comprising a base, a mounting plate detachably mounted at the top center of the base, a central support seat at the top center of the mounting plate, arc-shaped grooves on both sides of the surface of the mounting plate, an extension seat welded to the side wall of the base, a drive motor fixedly mounted on one side of the top of the extension seat, a first screw connected to the output end of the drive motor, a threaded sleeve fitted on the outer side of the first screw, a pull seat fixedly mounted at the top of the threaded sleeve, a pull rod rotatably connected to one end of the pull seat, a movable seat rotatably connected to the other end of the pull rod, an arc-shaped boss at the top of the movable seat, a steel lining body fitting against the upper arc surface of the arc-shaped boss, a connector fixedly mounted on one side of the bottom of the movable seat, a slider rotatably connected to the inner bottom of the connector, a first guide rod slidably connected to the inner bottom of the slider, and a second guide rod rotatably connected to one end of the first guide rod.

[0007] By adopting the above technical solution, it is convenient to adjust the welding point of the steel lining according to the actual welding requirements during subsequent welding. Furthermore, the entire moving seat can make arc-shaped movements under the action of the pull rod, thereby keeping the position of the welding head constant during welding, improving welding accuracy, and making the overall practicality higher.

[0008] Preferably, a guide block is fixedly provided on the surface of the first guide rod away from the second guide rod, a bidirectional motor is fixedly provided in the inner cavity of one end of the first guide rod, the output end of the bidirectional motor is connected to a second screw, an adjusting seat is sleeved on the outer ring surface of the second screw, a pressure rod is fixedly provided on the side wall of the adjusting seat, a locking rod is fixedly provided on one end surface of the pressure rod, and a locking hole is provided on one side of the arc groove at the front end of the mounting base plate.

[0009] Preferably, an adjustment frame is rotatably connected to the inner side of one end of the movable seat, and a cylinder is fixedly mounted on one side of the top end of the adjustment frame, with a lifting plate connected to the output end of the cylinder.

[0010] Preferably, a guide frame is fixedly provided at the top of the lifting plate, a buffer spring is sleeved on the outer side of one end of the guide frame, a movable arm is fixedly connected to one end of the buffer spring, and a pressure roller is rotatably connected to one side of the bottom of the movable arm.

[0011] Preferably, a positioning rod extends through one side of the bottom of the adjustment frame, an auxiliary sliding plate is fitted onto one end of the positioning rod, a return spring is fixedly connected to one end of the auxiliary sliding plate, and a positioning hole is provided on the inner wall of the front end of the movable seat.

[0012] Preferably, the inner side of the threaded sleeve has a threaded hole with a diameter that matches the outer diameter of the first screw, and the threaded sleeve is threadedly connected to the first screw through the threaded hole.

[0013] Preferably, the two ends of the pull rod are rotatably connected to the movable seat and the pull seat respectively through bearing seats, and the pull rod is symmetrically distributed along the vertical center line of the movable seat.

[0014] Preferably, the two ends of the slider are rotatably connected to the connecting parts via shafts, and the bottom inner side of the slider has a groove with a diameter that matches the outer diameter of the first guide rod and the second guide rod.

[0015] Preferably, one end surface of the guide block is provided with a groove for the sliding of the pressure rod, and the outer diameter of the guide block is adapted to the inner diameter of the arc groove.

[0016] Preferably, the movable arm has a through hole on the inner side of its top end with a diameter that matches the outer diameter of the guide frame, and the movable arm is slidably connected to the guide frame through the through hole; The two ends of the return spring are fixedly connected to the bottom of one end of the movable arm and the surface of one end of the lifting plate, respectively.

[0017] This invention provides a clamping fixture for spot welding of steel linings in nuclear power plants. It has the following advantages: 1. The present invention, through the structure of the first screw, threaded sleeve, pull rod, slider and guide rod, can facilitate the adjustment of the welding point of the steel lining according to the actual welding requirements during subsequent welding. Furthermore, the entire moving seat can make arc-shaped movements under the action of the pull rod, thereby keeping the position of the welding head constant during welding, improving the welding accuracy and making the overall practicality higher.

[0018] 2. The present invention utilizes the arc-shaped groove, locking rod, and locking hole to facilitate the adjustment of the angle between the two guide rods during subsequent use. This allows for adjustment based on the curvature of different steel liners, enabling the moving seat to adjust the curvature of its movement when making arc-shaped motions. This adapts to steel liners of different sizes and curvatures, resulting in greater flexibility and a wider range of applications.

[0019] 3. The present invention employs a structure including a cylinder, pressure roller, movable arm, and buffer spring, which can press down and limit the edge of the steel lining before welding. Since the movable arm and pressure roller are movable, the edge of the steel lining at different bending positions can be pressed down during the pressing and limiting process, thus achieving simultaneous pressing at multiple points and ensuring the stability of the steel lining during subsequent welding. At the same time, the buffer spring can also provide a simple buffering effect. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a bottom view schematic diagram of the movable seat of the present invention; Figure 3 This is a side view of the movable seat of the present invention; Figure 4 This is a side view of the extension seat of the present invention; Figure 5 This is a side view of the mounting base plate of the present invention; Figure 6 This is a schematic cross-sectional view of the first guide rod portion of the present invention; Figure 7 This is a side view of the lifting plate of the present invention; Figure 8 This is a side view of the adjustment frame of the present invention; Figure 9 For the present invention Figure 8 Enlarged diagram of point A in the middle.

[0021] The components are as follows: 1. Base; 2. Mounting base plate; 3. Central support seat; 4. Arc-shaped groove; 5. Extension seat; 6. Drive motor; 7. First screw; 8. Threaded sleeve; 9. Pull seat; 10. Pull rod; 11. Moving seat; 12. Arc-shaped boss; 13. Steel lining body; 14. Connector; 15. Slider; 16. First guide rod; 17. Second guide rod; 18. Guide block; 19. Bidirectional motor; 20. Second screw; 21. Adjusting seat; 22. Pressure rod; 23. Locking rod; 24. Locking hole; 25. Adjusting frame; 26. Cylinder; 27. Lifting plate; 28. Guide frame; 29. ​​Buffer spring; 30. Movable arm; 31. Pressure roller; 32. Positioning rod; 33. Auxiliary sliding plate; 34. Return spring; 35. Positioning hole. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see the appendix Figure 1 -Appendix Figure 9This invention provides a clamping fixture for spot welding of steel linings in nuclear power plants, including a base 1. A mounting base plate 2 is detachably mounted on the top center of the base 1. A central support seat 3 is provided at the top center of the mounting base plate 2. Arc-shaped grooves 4 are formed on both sides of the surface of the mounting base plate 2. An extension seat 5 is welded to the side wall of the base 1. A drive motor 6 is fixedly mounted on one side of the top of the extension seat 5. A first screw 7 is connected to the output end of the drive motor 6. A threaded sleeve 8 is fitted on the outer side of the first screw 7. The top of the threaded sleeve 8... A pull seat 9 is fixedly provided at one end. A pull rod 10 is rotatably connected to one end surface of the pull seat 9. A movable seat 11 is rotatably connected to the other end of the pull rod 10. An arc-shaped boss 12 is provided at the top of the movable seat 11. A steel lining body 13 is attached to the upper arc surface of the arc-shaped boss 12. A connector 14 is fixedly provided on one side of the bottom of the movable seat 11. A slider 15 is rotatably connected to the bottom inner side of the connector 14. A first guide rod 16 is slidably connected to the bottom inner side of the slider 15. A second guide rod 17 is rotatably connected to one end of the first guide rod 16. Specifically, in use, the steel lining body 13 to be welded is first attached to the surface of the arc-shaped boss 12 and positioned accordingly. Then, when welding is required on the steel lining body 13, the drive motor 6 on one side of the top of the extension seat 5 operates, causing the first screw 7 connected to its output end to rotate. Since the first screw 7 and the threaded sleeve 8 are connected by a threaded hole, the rotation of the first screw 7 causes the threaded sleeve 8 to move axially along it. Under the action of the movement of the threaded sleeve 8, the pull seat 9 moves synchronously. The movement of the pull seat 9 can pull the pull rod 10, which in turn pulls the other end of the pull rod 10 to rotate. The movable seat 11 is connected to the pull rod 10. At this time, the movable seat 11 will drive the slider 15 to slide along the surface of the first guide rod 16 and the second guide rod 17 under the pulling force of the pull rod 10. Since the first guide rod 16 and the second guide rod 17 are tapered, the movable seat 11 will make an arc motion when it drives the slider 15 to slide along the two guide rods. This will cause the steel lining body 13 to also make an arc motion, so as to better weld the outer arc surface of the steel lining body 13. In addition, it is not necessary to frequently adjust the position of the welding head during the welding process, thus effectively ensuring the welding accuracy and improving the overall practicality. It is worth noting that since the slider 15 and the connector 14 are connected by a shaft, when the slider 15 slides along the first guide rod 16 and the second guide rod 17, the slider 15 will rotate along the bottom inner side of the connector 14. This allows for real-time adjustment of the slider 15's own posture and prevents the position of the slider 15 from being locked, which would affect the subsequent arc movement of the entire moving seat 11.

[0024] Please see the appendix Figure 5 and attached Figure 6A guide block 18 is fixedly provided on the surface of the first guide rod 16 away from the second guide rod 17. A bidirectional motor 19 is fixedly provided in the inner cavity of one end of the first guide rod 16. The output end of the bidirectional motor 19 is connected to the second screw 20. An adjusting seat 21 is sleeved on the outer ring surface of the second screw 20. A pressure rod 22 is fixedly provided on the side wall of the adjusting seat 21. A locking rod 23 is fixedly provided on one end surface of the pressure rod 22. A locking hole 24 is provided on one side of the arc groove 4 at the front end of the mounting base plate 2. Specifically, when the curvature of the arc-shaped movement of the moving seat 11 needs to be adjusted according to welding requirements, the bidirectional motor 19 operates, causing the second screw 20 connected to its output end to rotate. At this time, the rotation of the second screw 20 drives the adjusting seat 21 to move axially along the second screw 20. At this time, the adjusting seat 21 drives the locking rod 23 to disengage from the inside of the locking hole 24 through the pressure rod 22. Subsequently, the first guide rod 16 and the second guide rod 17 on both sides are moved, causing the first guide rod 16 and the second guide rod 17 to drive the guide block 18 to slide along the arc-shaped groove 4. After the position adjustment of the guide rods on both sides is completed, the bidirectional motor 19 rotates in the opposite direction, causing the second screw 20 to reverse. At this time, the rotation of the second screw 20 will cause the adjusting seat 21 to drive the pressure rod 22 to reset, thereby using the pressure rod 22 to drive the locking rod 23 to reset, and re-inserting one end of the locking rod 23 into the other locking hole 24, thereby realizing the re-limiting treatment of the first guide rod 16 and the second guide rod 17 on both sides. Multiple sets of lock holes 24 are provided, and the lock holes 24 are arranged in a circular array along the rotation center point of the first guide rod 16 and the second guide rod 17. At the same time, the first guide rod 16 and the second guide rod 17 are each equipped with an independent bidirectional motor 19. The bidirectional motor 19 is a motor with a forward and reverse rotation structure. The multiple bidirectional motors 19 symmetrically arranged on both sides are controlled by a controller and can work simultaneously or independently.

[0025] Please see the appendix Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 7 and attached Figure 8 An adjusting frame 25 is rotatably connected to the inner side of one end of the movable seat 11. A cylinder 26 is fixedly installed on one side of the top of the adjusting frame 25. A lifting plate 27 is connected to the output end of the cylinder 26. A guide frame 28 is fixedly installed on the top of the lifting plate 27. A buffer spring 29 is sleeved on the outer side of one end of the guide frame 28. A movable arm 30 is fixedly connected to one end of the buffer spring 29. A pressure roller 31 is rotatably connected to one side of the bottom of the movable arm 30. Specifically, when the steel lining body 13 is attached to the surface of the arc-shaped boss 12, the symmetrically arranged adjustment frames 25 on both sides are reset to be vertically distributed between them and the moving seat 11. Then, the cylinders 26 fixed on both sides of the top of the adjustment frame 25 work to push the lifting plate 27 connected to its output end. As the lifting plate 27 moves, it can drive the pressure roller 31 at its bottom to contact the edge of the steel lining body 13, thereby achieving the downward pressure limit treatment of the steel lining body 13. During the downward pressing of the pressure roller 31, as the pressure roller 31 comes into contact with the steel lining body 13, it will push the pressure roller 31 in the opposite direction under the action of force. At this time, the longitudinal movement of the pressure roller 31 pushes the movable arm 30, causing the movable arm 30 to slide along the guide frame 28. During the movement of the movable arm 30, the buffer spring 29 will deform and generate a reverse force. Combined with this reverse force, a simple buffer protection effect can be achieved to prevent the pressure of the pressure roller 31 from being too large and causing the surface of the steel lining body 13 to dent or other problems.

[0026] Please see the appendix Figure 3 and attached Figure 9 A positioning rod 32 runs through one side of the bottom of the adjusting frame 25. An auxiliary sliding plate 33 is fitted on one end of the positioning rod 32. A return spring 34 is fixedly connected to one end of the auxiliary sliding plate 33. A positioning hole 35 is opened on the inner wall of the front end of the moving seat 11. Specifically, when the steel lining body 13 is placed on the arc-shaped boss 12, the adjusting frame 25 is pre-moved to make the adjusting frame 25 and the moving seat 11 parallel to each other, so as to prevent the setting of the adjusting frames 25 on both sides from affecting the normal positioning of the steel lining body 13. After the steel lining body 13 is placed, the adjusting frame 25 is moved back to be perpendicular to the moving seat 11. At this time, the positioning rod 32 moves to one side of the positioning hole 35, and the center lines of the two are on the same center line. Then, the reverse force generated by the deformation of the return spring 34 can push the auxiliary slide plate 33. Then, the movement of the auxiliary slide plate 33 drives the positioning rod 32 to be horizontally reset, thereby pushing one end of the positioning rod 32 back into the positioning hole 35, realizing the limiting treatment of the adjusting frame 25 and ensuring the stability of the adjusting frames 25 on both sides. The positioning holes 35 are distributed at a 90-degree right angle along the inner wall of the movable seat 11. Multiple positioning holes 35 are symmetrically arranged on the inner walls at both ends of the movable seat 11, and the inner diameter of the positioning holes 35 is adapted to the outer diameter of the positioning rod 32.

[0027] Please see the appendix Figure 2 Appendix Figure 3 and attached Figure 4 The inner side of the threaded sleeve 8 is provided with a threaded hole whose diameter is adapted to the outer diameter of the first screw 7. The threaded sleeve 8 is connected to the first screw 7 through the threaded hole. Specifically, the threaded connection between the threaded sleeve 8 and the first screw 7 allows the threaded sleeve 8 to move axially as the first screw 7 rotates, facilitating subsequent adjustment of the position of the pull seat 9.

[0028] Please see the appendix Figure 2 and attached Figure 3 The two ends of the pull rod 10 are rotatably connected to the movable seat 11 and the pull seat 9 respectively through bearing seats, and the pull rod 10 is symmetrically distributed along the vertical center line of the movable seat 11; Specifically, as the pull seat 9 moves axially along the first screw 7, the pull seat 9 will pull the pull rod 10. At this time, the pull rod 10 will pull the movable seat 11, which is rotatably connected to its other end, so as to facilitate the subsequent position adjustment of the movable seat 11.

[0029] Please see the appendix Figure 2 Appendix Figure 3 Appendix Figure 4 and attached Figure 5 The two ends of the slider 15 are rotatably connected to the connector 14 through the shaft. The bottom inner side of the slider 15 is provided with a slot whose diameter is adapted to the outer diameter of the first guide rod 16 and the second guide rod 17. Specifically, since the slider 15 and the connector 14 are rotatably connected, when the slider 15 slides along the surface of the first guide rod 16 and the second guide rod 17, the angle can be finely adjusted along the connector 14 to prevent the slider 15 from getting stuck during the subsequent adjustment process.

[0030] Please see the appendix Figure 5 and attached Figure 6 The guide block 18 has a slot on one end surface for the pressure rod 22 to slide, and the outer diameter of the guide block 18 is matched with the inner diameter of the arc groove 4. Specifically, the slot on one end of the guide block 18 can improve the stability of the pressure rod 22 during its movement, providing guidance and limiting for the movement of the pressure rod 22. When the guide block 18 moves under the action of the guide rod, it will slide along the arc groove 4. The angle between the two guide rods can be adjusted by adjusting the position of the guide block 18 inside the arc groove 4.

[0031] Please see the appendix Figure 7 and attached Figure 8 The top inner side of the movable arm 30 is provided with a through hole whose diameter is adapted to the outer diameter of the guide frame 28. The movable arm 30 is slidably connected to the guide frame 28 through the through hole. The two ends of the return spring 34 are fixedly connected to the bottom of one end of the movable arm 30 and the surface of one end of the lifting plate 27, respectively. Specifically, during use, the movable arm 30 slides along the guide frame 28 when it moves longitudinally, which can improve the stability of the movable arm 30 during movement. As the movable arm 30 moves longitudinally, it will compress the return spring 34 fixedly connected to one end, causing it to deform and generate a reverse force, which can provide a simple buffering effect.

[0032] Work process: First, adjust the adjusting frame 25 so that it is parallel to the moving seat 11. Then, place the steel lining body 13 to be welded on the surface of the arc-shaped boss 12. Then, adjust the adjusting frame 25 to reset it so that it is perpendicular to the moving seat 11. At this time, the positioning rod 32 moves to one side of the positioning hole 35 and the center lines of the two are on the same center line. Then, the reverse force generated by the deformation of the return spring 34 can push the auxiliary slide plate 33. Then, the movement of the auxiliary slide plate 33 drives the positioning rod 32 to perform lateral reset, thereby pushing one end of the positioning rod 32 back into the positioning hole 35, realizing the limiting treatment of the adjusting frame 25 and ensuring the stability of the adjusting frames 25 on both sides. When the steel lining body 13 is attached to the surface of the arc-shaped boss 12, the symmetrically arranged adjustment frames 25 on both sides are reset to be vertically distributed with the moving seat 11. Then, the cylinders 26 fixed on both sides of the top of the adjustment frame 25 work to push the lifting plate 27 connected to its output end. As the lifting plate 27 moves, the pressure roller 31 at its bottom can be driven to contact the edge of the steel lining body 13, thereby achieving the downward pressure limit treatment of the steel lining body 13. During the welding of the steel lining body 13, the drive motor 6 on one side of the top of the extension seat 5 operates, causing the first screw 7 connected to its output end to rotate. Since the first screw 7 and the threaded sleeve 8 are connected by a threaded hole, the rotation of the first screw 7 causes the threaded sleeve 8 to move axially along it. Under the action of the movement of the threaded sleeve 8, the pull seat 9 moves synchronously. The movement of the pull seat 9 can pull the pull rod 10. At this time, the pull rod 10 pulls the movable seat 11 rotatably connected to its other end. The movable seat 11 is pulled by the pulling force of the pull rod 10. The action will cause the slider 15 to slide along the surface of the first guide rod 16 and the second guide rod 17. At this time, since the first guide rod 16 and the second guide rod 17 are tapered, the moving seat 11 will make an arc-shaped movement when it drives the slider 15 to slide along the two guide rods. This will cause the steel lining body 13 to also make an arc-shaped movement, so as to better weld the outer arc surface of the steel lining body 13. In addition, it is not necessary to frequently adjust the position of the welding head during the welding process, which can effectively ensure the welding accuracy and improve the overall practicality. When the curvature of the moving seat 11 needs to be adjusted according to welding requirements, the bidirectional motor 19 operates, causing the second screw 20 connected to its output end to rotate. At this time, the rotation of the second screw 20 drives the adjusting seat 21 to move axially along the second screw 20. Simultaneously, the adjusting seat 21, through the pressure rod 22, causes the locking rod 23 to disengage from the inside of the locking hole 24. Subsequently, the first guide rod 16 and the second guide rod 17 on both sides are moved, causing the first guide rod 16 and the second guide rod 17 to drive the guide block 18 to slide along the arc-shaped groove 4. After the positions of the guide rods on both sides are adjusted, the bidirectional motor 19 rotates in the opposite direction, driving the second screw 20 to reverse. At this time, the rotation of the second screw 20 will cause the adjusting seat 21 to drive the pressure rod 22 to reset, thereby using the pressure rod 22 to drive the locking rod 23 to reset. One end of the locking rod 23 is then reinserted into the other locking hole 24, realizing the repositioning of the first guide rod 16 and the second guide rod 17 on both sides. At this time, the angle adjustment between the first guide rod 16 and the second guide rod 17 is completed, which can realize the adjustment of the subsequent movement arc of the moving seat 11.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A clamping fixture for spot welding of steel linings in nuclear power plants, comprising a base (1), characterized in that, A mounting base plate (2) is detachably installed at the top center of the base (1). A central support seat (3) is provided at the top center of the mounting base plate (2). Arc grooves (4) are provided on both sides of the surface of the mounting base plate (2). An extension seat (5) is welded to the side wall of the base (1). A drive motor (6) is fixedly installed on one side of the top of the extension seat (5). A first screw (7) is connected to the output end of the drive motor (6). A threaded sleeve (8) is sleeved on the outside of the first screw (7). A pull seat (9) is fixedly installed at the top of the threaded sleeve (8). A pull rod (10) is rotatably connected to one end of the surface of the pull rod (10), and a movable seat (11) is rotatably connected to the other end of the pull rod (10). An arc-shaped boss (12) is provided at the top of the movable seat (11), and a steel lining body (13) is attached to the upper arc surface of the arc-shaped boss (12). A connector (14) is fixedly provided on one side of the bottom of the movable seat (11), and a slider (15) is rotatably connected to the inner bottom of the connector (14). A first guide rod (16) is slidably connected to the inner bottom of the slider (15), and a second guide rod (17) is rotatably connected to one end of the first guide rod (16).

2. The clamping fixture for spot welding of steel lining in nuclear power plants according to claim 1, characterized in that, A guide block (18) is fixedly provided on the surface of the first guide rod (16) away from the second guide rod (17). A bidirectional motor (19) is fixedly provided in the inner cavity of one end of the first guide rod (16). The output end of the bidirectional motor (19) is connected to a second screw (20). An adjusting seat (21) is sleeved on the outer ring surface of the second screw (20). A pressure rod (22) is fixedly provided on the side wall of the adjusting seat (21). A locking rod (23) is fixedly provided on one end surface of the pressure rod (22). A locking hole (24) is provided on one side of the arc groove (4) at the front end of the mounting base plate (2).

3. The clamping fixture for spot welding of steel linings in nuclear power plants according to claim 1, characterized in that, An adjustment frame (25) is rotatably connected to the inner side of one end of the movable seat (11). A cylinder (26) is fixed on one side of the top of the adjustment frame (25). A lifting plate (27) is connected to the output end of the cylinder (26).

4. The clamping fixture for spot welding of steel lining in nuclear power plants according to claim 3, characterized in that, The top of the lifting plate (27) is fixedly provided with a guide frame (28), and a buffer spring (29) is sleeved on the outer side of one end of the guide frame (28). One end of the buffer spring (29) is fixedly connected to a movable arm (30), and a pressure roller (31) is rotatably connected to one side of the bottom of the movable arm (30).

5. The clamping fixture for spot welding of steel lining in nuclear power plants according to claim 4, characterized in that, A positioning rod (32) runs through one side of the bottom of the adjustment frame (25). An auxiliary sliding plate (33) is fitted on one end of the positioning rod (32). A return spring (34) is fixedly connected to one end of the auxiliary sliding plate (33). A positioning hole (35) is opened on the inner wall of the front end of the moving seat (11).

6. The clamping fixture for spot welding of steel lining in nuclear power plants according to claim 1, characterized in that, The inner side of the threaded sleeve (8) is provided with a threaded hole whose diameter is adapted to the outer diameter of the first screw (7), and the threaded sleeve (8) and the first screw (7) are connected by a thread through the threaded hole.

7. The clamping fixture for spot welding of steel lining in nuclear power plants according to claim 1, characterized in that, The two ends of the pull rod (10) are rotatably connected to the movable seat (11) and the pull seat (9) respectively through bearing seats. The pull rod (10) is symmetrically distributed along the vertical center line of the movable seat (11).

8. The clamping fixture for spot welding of steel lining in nuclear power plants according to claim 1, characterized in that, The two ends of the slider (15) are connected to the connector (14) by a shaft. The bottom inner side of the slider (15) is provided with a slot whose diameter is adapted to the outer diameter of the first guide rod (16) and the second guide rod (17).

9. A clamping fixture for spot welding of steel lining in a nuclear power plant according to claim 2, characterized in that, The guide block (18) has a slot on one end surface for sliding of the pressure rod (22), and the outer diameter of the guide block (18) is adapted to the inner diameter of the arc groove (4).

10. A clamping fixture for spot welding of steel lining in a nuclear power plant according to claim 5, characterized in that, The top inner side of the movable arm (30) is provided with a through hole whose diameter is adapted to the outer diameter of the guide frame (28), and the movable arm (30) and the guide frame (28) are slidably connected through the through hole; The two ends of the reset spring (34) are fixedly connected to the bottom of one end of the movable arm (30) and the surface of one end of the lifting plate (27), respectively.

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