A carrier device for main pump bolt detection

Abstract

This invention relates to a transport device for detecting main pump bolts, belonging to the field of main pump bolt detection technology. The device includes: a transport vehicle body, a fixed positioning seat, a movable positioning seat, main pump bolts, and a main pump upper arm. A detection device for detecting the main pump bolts is installed on the lower side of the transport vehicle body. This transport device can withstand a significantly increased axial force, making the movement of the locking vehicle's moving slider more stable and accurate, and is easy to install and disassemble. It can be used in some special confined areas and has high practical value.

Description

Technical Field

[0001] This invention belongs to the field of main pump bolt detection technology, and particularly relates to a transport device for main pump bolt detection. Background Technology

[0002] The reactor coolant main pump is one of the key pieces of equipment in the nuclear power plant loop. The main pump casing flange bolts, serving as the connection between the pump casing, pump cover, and sealing shell, operate under harsh conditions for extended periods, including high temperature, high pressure, high radioactivity, and variable loads, making them prone to fatigue damage.

[0003] ASME Code Volume XI explicitly requires volumetric inspection of bolts larger than 2 inches in diameter in Class I nuclear power pumps. However, manual inspection is often hampered by complex on-site conditions, limited operating space, prolonged exposure to radiation, and the risk of missed inspections, low efficiency, and inability to store and analyze data. Therefore, designing and developing an in-service inspection device for the main pump casing flange connection bolts is crucial. This article focuses on the transport device used for main pump bolt inspection. Summary of the Invention

[0004] The purpose of this invention is to provide a transport device for detecting main pump bolts, thereby solving the aforementioned problems.

[0005] This invention is implemented as follows: A structural diagram of a transport device for detecting main pump bolts includes: a transport vehicle body, a fixed positioning seat, a movable positioning seat, main pump bolts, and a main pump upper arm; a detection device for detecting the main pump bolts is installed on the lower side of the transport vehicle body, and the transport vehicle body is designed with an arc-shaped structure to facilitate stable fixation on the circularly distributed main pump bolts. A fixed positioning seat is fixedly installed on one side of the bottom of the transport vehicle body, and an arc-shaped sliding channel is opened inside the transport vehicle body corresponding to one end of the fixed positioning seat. A movable positioning seat is movably arranged inside the sliding channel. The fixed positioning seat and the movable positioning seat have the same internal structure, both including a positioning component. The positioning component is in pressure contact with the main pump bolt to realize the function of positioning and detecting the main pump bolt. A moving mechanism is provided on the transport vehicle body corresponding to the top of the fixed positioning seat and the movable positioning seat. The moving mechanism is used to drive the movable positioning seat to move inside the sliding channel, thereby adjusting the distance between the movable positioning seat and the fixed positioning seat, and driving the entire transport vehicle body to move along the main pump bolt to detect the main pump bolt at different positions.

[0006] The present invention provides a carrier device for detecting main pump bolts. 1. The method of fixing the carrier mechanism and the main pump body in the present invention adopts three-point support. The elastic material on the U-shaped block is pressed and fixed to the bolts on the main pump body by the cylinder. Compared with the traditional vacuum adsorption tube wall method, the axial force that the carrier device can withstand is greatly increased.

[0007] 2. The method used in this invention to drive the moving slider of the locking car is motor drive. The motor controls the displacement of the moving slider of the locking car through the transmission of gears, worm gears and racks. Compared with the traditional cylinder control method, this method can make the movement of the moving slider of the locking car more stable and precise.

[0008] 3. The method of the present invention for the circumferential motion of the transport system is as follows: the transport device has two wedges, one of which is fixed on the transport vehicle body and the other can slide along the arc of the transport vehicle body. By changing the position of the two wedges of the transport device, the transport vehicle body moves between four adjacent screws. Compared with the traditional method of adding circular guide rails to large shaft-shaped objects, this method greatly reduces the difficulty of installing and disassembling the mechanism and requires less space.

[0009] 4. Each movement in this invention employs a separate drive and transmission component, resulting in a simple transmission system that is easy to transport, install, and debug, facilitates fault detection, and is convenient to maintain. Furthermore, the device has a compact and small structure, making it suitable for various environments. Attached Figure Description

[0010] Figure 1 This is a first-view structural schematic diagram of a transport device used for main pump bolt inspection.

[0011] Figure 2 This is a second-view structural schematic diagram of a transport device used for main pump bolt inspection.

[0012] Figure 3 This is a third-view structural schematic diagram of a transport device used for main pump bolt inspection.

[0013] Figure 4 This is a front view schematic diagram of a transport device used for main pump bolt inspection.

[0014] Figure 5 for Figure 4 A magnified structural diagram of A1.

[0015] Figure 6 This is a top view schematic diagram of the connection between the positioning component and the vehicle body in a transport device used for main pump bolt inspection.

[0016] Figure 7 This is a schematic diagram of the distribution structure of a transport device for detecting main pump bolts and the main pump bolts.

[0017] In the attached diagram: 1. Pulley; 2. Pulley bracket; 3. Carrier body; 4. Fixed pressure bar; 5. Moving pressure bar; 6. Locking car moving slider; 7. Polyurethane pressure block; 8. Arc track; 9. U-shaped block; 10. Fixed positioning seat; 11. R-axis motor; 13. Rack; 14. Sliding channel; 15. Moving positioning seat; 20. Worm gear; 21. Motor bracket; 22. Gear 1; 23. Gear 2; 24. Connecting frame; 25. Spring; 27. Cylinder 1; 28. Cylinder 2; 29. ​​Main pump bolt; 30. Main pump upper arm. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 The diagram shows a structural representation of a transport device for detecting main pump bolts according to an embodiment of the present invention. The device includes: a transport vehicle body 3, a fixed positioning seat 10, a movable positioning seat 15, main pump bolts 29, and a main pump upper arm 30. A detection device for detecting the main pump bolts 29 is installed on the lower side of the transport vehicle body 3. The transport vehicle body 3 is designed with an arc-shaped structure to facilitate stable fixation on the circularly distributed main pump bolts 29. A fixed positioning seat 10 is fixedly installed on one side of the bottom of the transport vehicle body 3. An arc-shaped sliding channel 14 is formed inside the transport vehicle body 3 corresponding to one end of the fixed positioning seat 10. The sliding channel 14 contains... The movable positioning seat 15 is provided. The fixed positioning seat 10 and the movable positioning seat 15 have the same internal structure and both include positioning components. The positioning components are in contact with the main pump bolt 29 to realize the function of positioning and detecting the main pump bolt. The fixed positioning seat 10 and the top of the movable positioning seat 15 are provided with a moving mechanism on the vehicle body 3. The moving mechanism is used to drive the movable positioning seat 15 to move inside the sliding channel 14, thereby adjusting the distance between the movable positioning seat 15 and the fixed positioning seat 10, and driving the vehicle body 3 as a whole to move along the main pump bolt 29 to detect the main pump bolt 29 at different positions.

[0021] In this embodiment of the invention, the moving mechanism includes an arc-shaped track 8 disposed on the upper part of the protruding side of the vehicle body 3. A locking vehicle moving slider 6 is slidably connected inside the arc-shaped track 8. Dynamic pressure strips 5 are installed on the upper and lower walls of the locking vehicle moving slider 6 facing the inner side of the arc-shaped track 8. The dynamic pressure strips 5 are used to keep the locking vehicle moving slider 6 moving stably inside the arc-shaped track 8 from the inside and move synchronously with the locking vehicle moving slider 6. Fixed pressure strips 4 are symmetrically installed on the upper and lower walls of the vehicle body 3 corresponding to the outer side of the locking vehicle moving slider 6. The fixed pressure strips are used to restrict the locking vehicle moving slider 6 within the arc-shaped track 8 from the outside. A driving component is connected to one end of the dynamic pressure strip 5 facing the middle of the vehicle body 3. The driving component is used to drive the dynamic pressure strip 5 together with the locking vehicle moving slider 6 along the vehicle body. 3. The protruding side moves, and one end of the drive component is connected downward to the movable positioning seat 15. That is, the drive component runs and drives the movable positioning seat 15 to move inside the sliding channel 14. Then, the distance between the movable positioning seat 15 and the fixed positioning seat 10 is adjusted. Then, the movement of the fixed positioning seat 10 is controlled by whether the positioning component inside the movable positioning seat 15 and the main pump bolt 29 are positioned. That is, after the movable positioning seat 15 is moved to the appropriate position, the positioning component inside the movable positioning seat 15 is activated to press and fix it with the main pump bolt 29 on its outside. Then, the drive component is controlled to run in the opposite direction. At this time, the movable positioning seat 15 is in a fixed state. Therefore, the entire vehicle body 3 and the fixed positioning seat 10 can be driven to adjust their positions along the main pump bolt 29.

[0022] See Figure 5 In a preferred embodiment of the present invention, the drive assembly includes a motor bracket 21 installed inside one side of the vehicle body 3. A U-shaped connecting frame 24 is installed on the protruding side of the motor bracket 21 facing the vehicle body 3. A gear 22 is rotatably arranged inside the lower side of the connecting frame 24. One end of the gear 22 passes through the connecting frame 24 and connects to the R-axis motor 11. A gear 23 meshes with the top side of the gear 22. One end of the gear 23 is connected to a worm gear 20. A rack 13 meshes with the top of the worm gear 20. One end of the rack 13 is fixedly connected to the dynamic pressure strip 5 inside the locking vehicle moving slider 6. The rack 13 is slidably connected to the vehicle body 3, i.e., the R-axis motor 11... When rotating forward, the drive gear 22 rotates, and then through the meshing of gear 22 and gear 23, the worm gear 20 and rack 13 are driven to rotate synchronously. At this time, the positioning component inside the fixed positioning seat 10 is pressed and fixed with the main pump bolt, keeping the carrier body 3 fixed. Then the connecting frame 24 is in a stationary state. At this time, the rotation of the worm gear 20 can drive the rack 13 to move in the direction of the carrier body 3 toward the fixed positioning seat 10. At this time, since the locking car moving slider 6, the dynamic pressure strip 5 and the moving positioning seat 15 are fixedly connected, the moving positioning seat 15 can be driven synchronously to move in the direction of the fixed positioning seat 10 inside the sliding channel 14.

[0023] In a preferred embodiment of the present invention, after the movable positioning seat 15 is moved to a suitable position, its internal positioning component is activated to press and fix it against the external main pump bolt 29. Then, the positioning component on the fixed positioning seat 10 is separated from the external main pump bolt 29. Then, the R-axis motor 11 is driven to rotate in the opposite direction. Utilizing the fixing and limiting effect between the movable positioning seat 15 and the main pump bolt 29, when the R-axis motor 11 rotates in the opposite direction to drive the worm gear 20 and rack 13 to move, the rack 13 is in a fixed state, thereby driving the worm gear 20 to move along the rack 13 in the opposite direction. Simultaneously, under the fixed connection of the connecting frame 24, the movable motor bracket 21 and the transport vehicle body 3, the transport vehicle body 3 is driven synchronously, and the fixed positioning seat 10 moves as a whole. Then, it is moved to the next set of main pump bolts 29 for pressing and positioning. That is, by utilizing the forward and reverse rotation of the R-axis motor 11, and the pressing and fixing or separation between the movable positioning seat 15 and the internal positioning component of the fixed positioning seat 10 and the external main pump bolt 29, the overall automatic adjustment and positioning detection of the main pump bolts 29 at different positions is realized.

[0024] As a preferred embodiment of the present invention, taking the positioning component inside the fixed positioning seat 10 as an example, the positioning component includes a U-shaped block 9 that is radially telescopically arranged inside the fixed positioning seat 10 along the vehicle body 3. Polyurethane pressure blocks 7 are installed on both sides of the outer end of the U-shaped block 9. At the same time, a set of cylinders 27 with their ends fixed to the middle of the fixed positioning seat 10 are connected to the inner side of the U-shaped block 9. Springs 25 arranged inside the fixed positioning seat 10 are elastically connected to the two ends of the U-shaped block 9 facing the inner side of the fixed positioning seat 10. That is, when the cylinders 27 are activated, the U-shaped block moves radially along the vehicle body 3. At the same time, the rebound effect of the springs 25 can automatically keep the U-shaped block 9 able to move back to the initial fixed positioning seat 10, realizing the automated operation of driven extension and rebound force contraction.

[0025] In a preferred embodiment of the present invention, the positioning component inside the movable positioning base 15 has the same structure, size and operating principle as the positioning component inside the fixed positioning base 10.

[0026] As a preferred embodiment of the present invention, the polyurethane block 7 is mainly a thermoplastic linear structure with better stability, chemical resistance, resilience and mechanical properties, and smaller compression deformation. When it is pressed into contact with the main pump bolt 29, it can reduce wear between them and has good installation stability.

[0027] In a preferred embodiment of the present invention, two sets of pulleys 1 are installed on both sides of the top of the transport vehicle body 3 via pulley brackets 2. The top sidewall of the pulley 1 contacts the upper arm 30 of the main pump and is mainly used for axial positioning.

[0028] The above embodiments of the present invention provide a transport device for detecting main pump bolts. In use, the entire transport device is first placed inside the ring of bolts on the main pump. Simultaneously, the pulleys 1 on both sides of the top of the transport vehicle body 3 are brought into contact with the upper wall 30 of the main pump to maintain axial stability. Then, the cylinders 27 inside the two sets of positioning components are activated, pushing the U-shaped blocks 9 at their ends. This causes the polyurethane pressure blocks 7 on the U-shaped blocks 9 to contact the corresponding main pump bolts 29, generating pressure and firmly fixing the transport vehicle body 3 onto the main pump. After the transport vehicle body 3 is installed, operation begins. The cylinders 27 in the moving positioning seat 15 stop moving, and the U-shaped blocks 9 move backward under the action of the spring 25, separating the polyurethane pressure blocks 7 on the U-shaped blocks 9 from the main pump bolts 29. After the polyurethane pressure blocks 7 separate from the main pump bolts 29, the R-axis motor 11 starts rotating forward, driving the gears. 22 starts to rotate, and gear 22 meshes with the gear part on 23, so 23 also rotates. The worm gear 20 on 23 meshes with the rack 13, synchronously driving the worm gear 20 and the rack 13 to rotate. At this time, the U-shaped block 9 inside the fixed positioning seat 10 is pressed and fixed with the main pump bolt 29, keeping the carrier body 3 fixed. Then the connecting frame 24 is in a stationary state. At this time, the rotation of the worm gear 20 can drive the rack 13 to move in the direction of the carrier body 3 toward the fixed positioning seat 10. At this time, since the locking car moving slider 6, the moving pressure strip 5 and the moving positioning seat 15 are fixedly connected, the moving positioning seat 15 can be synchronously driven to move in the direction of the fixed positioning seat 10 inside the sliding channel 14. After the moving positioning seat 15 moves to the designated position, the R-axis motor 11 is turned off, the cylinder 27 is started, and the polyurethane pressure block 7 on the U-shaped block 9 contacts and presses the bolt 29 on the main pump.

[0029] After the polyurethane pressure block 7 inside the movable positioning seat 15 is fully tightened with the bolt 29 on the main pump, the cylinder 27 inside the fixed positioning seat 10 is closed. The U-shaped block 9 at its end moves backward under the tension of the spring 25, causing the polyurethane pressure block 7 on the U-shaped block 9 to separate from the bolt 29 on the main pump. After complete separation, the R-axis motor 11 is started in reverse. Utilizing the fixing and limiting effect between the movable positioning seat 15 and the main pump bolt 29, when the R-axis motor 11 rotates in the reverse direction to drive the worm gear 20 and rack 13 to move, the rack 13 is in a fixed state, thus driving the worm gear 20 to move along the rack 13 in the reverse direction. With the connecting frame 24, the moving motor bracket 21 and the carrier body 3 fixed together, the carrier body 3 is driven synchronously, the fixed positioning seat 10 moves as a whole, and then moves to the next set of main pump bolts 29 for compression positioning. When the above series of structures move to the appropriate position, the R-axis motor 11 stops rotating, the cylinder 27 starts, and the polyurethane pressure block 7 on the U-shaped block 9 in the fixed positioning seat 10 contacts and presses against the bolts 29 on the main pump. When the polyurethane pressure blocks 7 on the two U-shaped blocks 9 contact the bolts 29 on the main pump at the same time, a series of subsequent testing operations can be performed, and one motion cycle is completed.

[0030] The invention relates to a fully automatic transport device for detecting main pump bolts. This device can also be applied to the transport and testing of a series of objects on various cylindrical and ring-shaped objects of large volume in daily life.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A transport device for detecting bolts in a main pump, characterized in that, The transport device for detecting main pump bolts includes: a transport vehicle body, a fixed positioning seat, a movable positioning seat, main pump bolts, and a main pump upper arm; a detection device for detecting main pump bolts is installed on the lower side of the transport vehicle body, and the transport vehicle body is configured with an arc-shaped structure. A fixed positioning seat is fixedly installed on one side of the bottom of the vehicle body. An arc-shaped sliding channel is opened inside the vehicle body corresponding to one end of the fixed positioning seat. A movable positioning seat is movably installed inside the sliding channel. The fixed positioning seat and the movable positioning seat have the same internal structure, both including a positioning component. The positioning component is in contact with the main pump bolt to realize the function of positioning detection of the main pump bolt. The fixed positioning seat and the mobile positioning seat are respectively equipped with a moving mechanism on the vehicle body. The moving mechanism is used to drive the mobile positioning seat to move inside the sliding channel, thereby adjusting the distance between the mobile positioning seat and the fixed positioning seat, and driving the entire vehicle body to move along the main pump bolt to detect the main pump bolt at different positions.

2. The transport device for detecting main pump bolts according to claim 1, characterized in that, The moving mechanism includes an arc-shaped track located on the upper part of the protruding side of the vehicle body. A locking car moving slider is slidably connected inside the arc-shaped track. Dynamic pressure strips are installed on the upper and lower walls of the locking car moving slider facing the inner side of the arc-shaped track. A drive component is connected to one end of the dynamic pressure strip facing the middle of the vehicle body to drive the dynamic pressure strip and the locking car moving slider to move along the protruding side of the vehicle body. One end of the drive component is connected downward to a moving positioning seat.

3. The transport device for detecting main pump bolts according to claim 2, characterized in that, A pressure-regulating strip is symmetrically installed on the transport vehicle body corresponding to the upper and lower outer walls of the locking car's moving slider. The pressure-regulating strip is used to restrict the locking car's moving slider within the arc-shaped slide rail from the outside.

4. The transport device for detecting main pump bolts according to claim 3, characterized in that, The drive assembly includes a motor bracket installed inside one side of the vehicle body. A U-shaped connecting frame is installed on the protruding side of the motor bracket facing the vehicle body. A gear 1 is rotatably installed inside the lower side of the connecting frame. One end of the gear 1 passes through the connecting frame and connects to the R-axis motor. A gear 2 meshes with the top side of the gear 1. One end of the gear 2 is connected to a worm gear. A rack meshes with the top of the worm gear. One end of the rack is fixedly connected to the dynamic pressure strip inside the moving slider of the locking vehicle. The rack is slidably connected to the vehicle body.

5. A transport device for detecting main pump bolts according to claim 4, characterized in that, The positioning component includes a U-shaped block that is radially telescopically disposed inside the fixed positioning seat. Polyurethane pressure blocks are installed on both sides of the outer end of the U-shaped block. A set of cylinders with their ends fixed in the middle of the fixed positioning seat are connected to the inner side of the U-shaped block, and springs disposed inside the fixed positioning seat are elastically connected to both ends of the U-shaped block facing the inner side of the fixed positioning seat.

6. A transport device for detecting main pump bolts according to claim 5, characterized in that, Two sets of pulleys are installed on both sides of the top of the transport vehicle via pulley brackets, and the top sidewalls of the pulleys are in contact with the upper arm of the main pump.

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