Nuclear power station reactor equipment gate sealing and locking device

Abstract

The invention belongs to the technical field of equipment gate sealing and locking devices, and particularly relates to a nuclear power station reactor equipment gate sealing and locking device. The electric torque wrench is assembled and fixed on the bracket and the bracket; the electric torque wrench is screwed into the sealing locking nut during working; the cover plate is fixedly connected with the equipment gate body, the cover plate tightly presses the position adjusting assembly, and the cover plate supports the sealing locking nut; the mounting cylinder is provided with a position adjusting assembly; the sleeve sleeves the sealing locking nut, one end of the sleeve is connected with the electric torque wrench, and the sealing locking nut is driven to rotate through the sleeve; two grooves are formed in the outer wall of the sleeve in the circumferential direction, and the position adjusting assemblies rotate in the grooves; the position adjusting assemblies are uniformly distributed along the circumference of the mounting cylinder, and the supporting sleeve and the adjusting sleeve radially displace; the bracket is fixed on the cover plate; the support is installed on the linear guide rail. The device thoroughly solves the problem of thread seizure of the sealing and locking mechanism; the gate opening and closing time is shortened, and the equipment gate opening and closing efficiency and the transportation efficiency are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of equipment gate sealing and locking devices, and particularly relates to a sealing and locking device for a reactor equipment gate in a nuclear power plant. Background Art

[0002] During the sealing and unsealing operations of the equipment gates of Units 3 and 4 of a certain nuclear power plant, due to the asynchronous operation of 6 sealing electric heads and 3 push-pull electric heads, the door panel often tilts during operation, resulting in thread jamming failures of the nuts and screws of the equipment gate sealing mechanism, and the equipment gate loses its transportation function.

[0003] The designed functions of the equipment gate are as follows: ensuring that radioactive products are controlled within the accident confinement range, preventing the spread of ionizing radiation outside the accident confinement; ensuring that the outside of the containment is protected from external objects, systems, and accidents that may cause radiation leakage; ensuring that the steam generator can be transported after removing the ends of the gate housing; ensuring the tightness of the containment in case of fire, small leak, large leak, and beyond-design failure; ensuring that the following equipment can be transported into the containment: new fuel basket (with new fuel), spent fuel basket (with spent fuel), radioactive waste basket (with radioactive fuel), process transportation equipment, tools for technical maintenance, spare parts, and consumables.

[0004] In order to ensure the normal opening and closing of the reactor equipment gate, its good function, meeting the use requirements, reducing the failure rate, improving the reliability of the equipment gate, shortening the opening and closing time, and improving the work efficiency, etc., considering the actual situation on site, a sealing and locking device for a reactor equipment gate in a nuclear power plant is invented for the first time. Summary of the Invention

[0005] The purpose of the present invention is to provide a sealing and locking device for a reactor equipment gate in a nuclear power plant, ensuring that the reactor equipment gate has good functions during normal opening and closing, the gate screw can move in and out without jamming, improving the sealing reliability of the equipment gate, reducing operation failures, shortening the opening and closing time, and improving the work efficiency. Especially during major repairs, it provides strong guarantee for equipment transportation.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A gate sealing and locking device for a nuclear power plant reactor equipment. The electric torque wrench is assembled and fixed on the bracket and the bracket. During operation, the electric torque wrench is screwed into the sealing and locking nut; the cover plate is connected and fixed to the equipment gate body, the cover plate presses the position adjusting component, and the cover plate supports the sealing and locking nut; the installation cylinder installs the position adjusting component; the sleeve is sleeved on the sealing and locking nut, one end is connected to the electric torque wrench, and the sealing and locking nut is driven to rotate through the sleeve; two grooves are arranged along the circumferential direction on the outer wall of the sleeve, and the position adjusting component rotates in the grooves; the position adjusting components are evenly distributed along the circumference of the installation cylinder to support the radial displacement of the sleeve and the adjusting sleeve; the bracket is fixed on the cover plate; the bracket is installed on the linear guide rail; the sealing and locking nut is assembled in the sleeve and connected to the sliding component, and the screw rod passes through the gate body and is connected to the sealing and locking nut through the sleeve under the action of the electric torque wrench to play the role of tightening and loosening.

[0008] The electric torque wrench can output 1000 - 3000 N·m, and the torque can be adjusted. The adjustment gear is 100 N·m, and the error does not exceed 5%; the electric torque wrench is provided with overload protection to ensure that it stops working when the set torque is exceeded.

[0009] The electric torque wrench is assembled and fixed on the bracket and the bracket through M8*15 screws.

[0010] The cover plate is made of Q235B, with a thickness of 20 mm. There are 8 Φ22 bolt holes on the cover plate, and it is connected and fixed to the equipment gate body through 8 M20*65 bolts.

[0011] The installation cylinder is welded by a flange with an outer diameter of Φ560 mm and a thickness of 8 mm and a cylinder section with an inner diameter of Φ388 mm and a wall thickness of 6 mm.

[0012] The sleeve is made of 45 steel and is surface oxidized; the outer diameter of the sleeve is Φ168 mm, the inner part of the sleeve is processed into an internal hexagonal hole with a hole length of 227 mm, the end of the sleeve is processed into an internal square hole and is connected to the electric torque wrench; two grooves are arranged along the circumferential direction on the outer wall of the sleeve, with a groove depth of 3 mm and a width of 14 mm.

[0013] The position adjusting component consists of a roller, a bracket and a spring, and the maximum compression amount of the spring is limited to 5 mm by the column.

[0014] The bracket is made of Q235B, used to install the guide rail and support the electric torque wrench. The bracket consists of a bottom plate, a rib plate and a connecting plate; there are 4 - Φ11 through holes on the connecting plate of the bracket, and the bracket is fixed on the cover plate through 4 M10*30 bolts.

[0015] The support floor is provided with 6-M8 threads, and the linear guide rail is fixed on the floor through bolts; the main material of the support is Q235B, and a fixing sleeve is provided on the support for fixing the electric torque wrench, and the radial position of the electric torque wrench is adjusted by the adjusting screw on the sleeve.

[0016] The material of the sealing lock nut is SA-540, and the sealing lock nut is connected to the sliding component through a pin of M6*20.

[0017] The beneficial effects achieved by the present invention are as follows:

[0018] The use of this device independently executes the pushing / pulling and locking processes during the gate operation, completely solving the problem of thread jamming in the sealing and locking mechanism; the use of this device shortens the opening and closing time of the gate, improving the opening and closing efficiency of the equipment gate and the transportation efficiency; this device has an adjustment function and can realize the radial displacement adjustment during the tightening and loosening processes of the nut; the use of this device improves the reliability of the equipment gate seal; this device is simple to operate, easy to learn and use, reducing the operation difficulty; the design and manufacture of this device adopt modularization, and the components are convenient for replacement and maintenance. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the composition of a sealing and locking device for a nuclear power plant reactor equipment gate;

[0020] Figure 2 It is a front view of a sealing and locking device for a nuclear power plant reactor equipment gate;

[0021] Figure 3 It is a top view of a sealing and locking device for a nuclear power plant reactor equipment gate;

[0022] In the figure: 1 - electric torque wrench; 2 - cover plate; 3 - mounting cylinder; 4 - sleeve; 5 - position adjustment component; 6 - screw rod; 7 - sealing lock nut; 8 - sliding component; 9 - support; 10 - bracket. Detailed Embodiments

[0023] The present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0024] The sealing of the equipment gate is divided into two operation processes: pushing / pulling and locking. In the original mechanical structure of the equipment gate, 6 sealing electric heads and 3 pushing / pulling electric heads need to cooperate to complete the sealing operation. However, at present, the synchronization effect of the 9 electric heads is poor, and the door panel is prone to deflection, resulting in jamming of the nut and the screw rod, affecting the normal use of the equipment gate and the item transportation work, and further affecting the integrity of the containment barrier. Therefore, a sealing and locking device for a nuclear power plant reactor equipment gate is invented to improve the gate operation efficiency and sealing reliability. The main technical points of the sealing and locking device for the nuclear power plant equipment gate are as follows:

[0025] Optimize the sizes of the nut and sleeve of the sealing and locking device, so that after the door panel is pushed and pulled in place, the nut and the screw have not yet engaged, realizing a complete separation between the pushing / pulling and loosening / tightening processes; the sealing nut is installed inside the sleeve, and the electric torque wrench drives the sleeve, thereby driving the nut to tighten and loosen; the sleeve is supported and its radial displacement is adjusted by a position adjustment component with rollers at both ends, and the position adjustment component is welded to the inner wall of the installation sleeve; the installation sleeve is directly installed inside the original equipment gate sealing and locking sleeve and fixed by 8 M20 bolts at the flange end of the sleeve; modify the power supply wiring of the original electric head to the power supply of the electric torque wrench.

[0026] A reactor equipment gate sealing and locking device consists of an electric torque wrench 1, a cover plate 2, an installation cylinder 3, a sleeve 4, a position adjustment component 5, a screw 6, a sealing and locking nut 7, a sliding component 8, a bracket 9, and a bracket 10.

[0027] The electric torque wrench 1 is a power device that can output 1000 - 3000 N·m, and the torque can be adjusted, with an adjustment range of 100 N·m and an error not exceeding 5%. The electric torque wrench 1 is provided with overload protection to ensure that it stops working when the set torque is exceeded. The electric torque wrench 1 is assembled and fixed to the bracket 9 and the bracket 10 by M8*15 screws, and when working, the electric torque wrench 1 screws into the sealing and locking nut 7.

[0028] The material of the cover plate 2 is Q235B, with a thickness of 20 mm. The cover plate 2 is provided with 8 Φ22 bolt holes and is connected and fixed to the equipment gate body by 8 M20*65 bolts. The cover plate 2 is used to press the position adjustment component 5 to slide back and forth and support the sealing and locking nut 7.

[0029] The installation cylinder 3 is welded by a flange with an outer diameter of Φ560 mm and a thickness of 8 mm and a cylinder section with an inner diameter of Φ388 mm and a wall thickness of 6 mm. The installation cylinder 3 is used to install the position adjustment component 5.

[0030] The sleeve 4 is sleeved on the sealing and locking nut 7, and one end is connected to the electric torque wrench 1, driving the sealing and locking nut 7 to rotate through the sleeve. The material of the sleeve 4 is 45 steel, with a surface oxidation treatment. The outer diameter of the sleeve 4 is Φ168 mm, the inside of the sleeve is machined into an internal hexagonal hole with a hole length of 227 mm, and the end of the sleeve is machined into an internal square hole for connection with the electric torque wrench 1. Two grooves are provided along the circumferential direction on the outer wall of the sleeve, with a groove depth of 3 mm and a width of 14 mm, ensuring that the rollers of the position adjustment component 5 rotate in the grooves.

[0031] The position adjustment components 5 are evenly distributed along the circumference of the installation cylinder 3 and are used to support the sleeve 4 and adjust the radial displacement of the sleeve. The position adjustment component 5 mainly consists of rollers, brackets, and springs, and the maximum compression amount of the spring is limited to 5 mm by a column.

[0032] The main material of the bracket 10 is Q235B, which is used to install the guide rail and support the torque wrench 1. The bracket 10 is composed of a bottom plate, a rib plate and a connecting plate. There are 6-M8 threads on the floor of the bracket 9, and the linear guide rail is fixed on the floor by bolts. There are 4-Φ11 through holes on the connecting plate of the bracket 10, and the bracket 10 is fixed on the cover plate 2 by 4 M10*30 bolts.

[0033] The main material of the bracket 9 is Q235B, which is installed on the linear guide rail and can slide along the guide rail. There is a fixed sleeve on the bracket 9 for fixing the electric torque wrench 1, and the radial position of the torque wrench can be adjusted by the adjusting screw on the fixed sleeve 4.

[0034] The material of the seal locking nut 7 is SA-540, which is assembled in the sleeve 4 and connected to the sliding component 8 by an M6*20 pin. The screw rod 6 (original of the equipment body) passes through the gate body and is connected to the seal locking nut 7 under the action of the electric torque wrench 1 through the sleeve 4, playing the role of tightening and loosening.

[0035] The usage method of a seal locking device for a nuclear power plant reactor equipment gate is as follows:

[0036] Tightening operation: After the seal door of the equipment gate is moved from the moving frame to the position in contact with the door frame, the steps to tighten the seal locking nut 7 using this equipment are as follows: Push the electric torque wrench 1 forward, push the seal locking nut 7 forward through the sliding component 8, so that the seal locking nut 7 contacts the screw rod 6. After starting the electric torque wrench 1, the seal locking nut 7 and the screw rod 6 achieve initial meshing. After the seal locking nut 7 and the screw rod 6 complete the initial meshing, start using the electric torque wrench 1 to tighten the seal locking nut 7. The pre-tightening requirement of the seal locking nut: The reference tightening torque is: 2000 N·m. After the seal locking nut 7 is sealed in place, the gate body and the containment shell are completely sealed.

[0037] Loosening operation: Power on the electric torque wrench 1, adjust the torque of the electric torque wrench 1 to 2000 N·m, check that the direction of the electric torque wrench 1 is forward rotation, push the electric torque wrench 1 to tighten against the seal locking nut 7, and the operator starts the electric torque wrench until the torque reaches 2000 N·m, and the electric torque wrench stops operating. During the process of the seal locking nut 7 moving backward from the screw rod 6, the sliding component 8 moves accordingly. At this time, the electric torque wrench 1 drives and moves backward on the linear guide rail through the sliding component 8. After the proximity switch senses that the seal locking nut 7 is completely disengaged from the bolt, the electric torque wrench 1 stops working. After the seal locking nut 7 is loosened in place, the electric operation push-pull electric head opens the equipment gate.

[0038] The gate sealing and locking device of the reactor equipment effectively reduces the failure rate of the equipment gate during the opening and closing process, simplifies the operation process of opening and closing the equipment gate, shortens the opening and closing time of the equipment gate, improves the working efficiency of opening and closing the equipment gate, and provides a strong guarantee for the multiple opening and closing of the equipment gate during the overhaul period. The present invention can be directly promoted and used in the same type of units. The present invention can be extended to similar equipment and work in other units of the power station; the present invention also has good reference significance for other similar equipment and work in the same industry.

Claims

1. A gate sealing and locking device for a nuclear power plant reactor equipment, characterized in that: The electric torque wrench is assembled and fixed on the bracket and the bracket. During operation, the electric torque wrench is screwed into the sealing lock nut. The cover plate is connected and fixed to the equipment gate body. The cover plate presses the position adjustment component, and the cover plate supports the sealing lock nut. The installation cylinder installs the position adjustment component. The sleeve is sleeved on the sealing lock nut, and one end is connected to the electric torque wrench. The sealing lock nut is driven to rotate through the sleeve. Two grooves are provided along the circumferential direction of the outer wall of the sleeve, and the position adjustment component rotates in the grooves. The position adjustment components are evenly distributed along the circumference of the installation cylinder to support the sleeve and adjust the radial displacement of the sleeve. The bracket is fixed on the cover plate; the bracket is installed on the linear guide rail. The sealing lock nut is assembled in the sleeve and connected to the sliding component. The screw rod passes through the gate body and is connected to the sealing lock nut through the sleeve under the action of the electric torque wrench, playing the role of tightening and loosening.

2. The gate seal locking device for a nuclear power plant reactor equipment according to claim 1, characterized in that: The electric torque wrench can output 1000 - 3000 N·m, and the torque can be adjusted. The adjustment gear is 100 N·m, and the error does not exceed 5%. The electric torque wrench is provided with overload protection to ensure that it stops working when the set torque is exceeded.

3. The gate seal locking device for a nuclear power plant reactor equipment according to claim 1, characterized in that: The electric torque wrench is assembled and fixed on the bracket and the bracket through M8*15 screws.

4. The gate seal locking device for a nuclear power plant reactor equipment according to claim 1, characterized in that: The material of the cover plate is Q235B, with a thickness of 20 mm. There are 8 Φ22 bolt holes on the cover plate, and it is connected and fixed to the equipment gate body through 8 M20*65 bolts.

5. The gate sealing and locking device for a nuclear power plant reactor equipment according to claim 1, characterized in that: The installation cylinder is welded by a flange with an outer diameter of Φ560 mm and a thickness of 8 mm and a cylinder section with an inner diameter of Φ388 mm and a wall thickness of 6 mm.

6. The gate seal locking device for a nuclear power plant reactor equipment according to claim 1, wherein: The material of the sleeve is 45 steel, with surface oxidation treatment. The outer diameter of the sleeve is Φ168 mm. The inner part of the sleeve is processed into an internal hexagonal hole with a hole length of 227 mm. The end of the sleeve is processed into an internal square hole and is connected to the electric torque wrench. Two grooves are provided along the circumferential direction of the outer wall of the sleeve, with a groove depth of 3 mm and a width of 14 mm.

7. The gate seal locking device for a nuclear power plant reactor equipment according to claim 1, characterized in that: The position adjustment component consists of a roller, a bracket, and a spring. The maximum compression amount of the spring is limited to 5 mm through a column.

8. The gate seal locking device for a nuclear power plant reactor equipment according to claim 1, characterized in that: The material of the bracket is Q235B, which is used to install the guide rail and support the electric torque wrench. The bracket consists of a bottom plate, rib plates, and connecting plates. There are 4 - Φ11 through holes on the connecting plate of the bracket, and the bracket is fixed on the cover plate through 4 M10*30 bolts.

9. The gate sealing and locking device for a nuclear power plant reactor equipment according to claim 1, characterized in that: There are 6 - M8 threads on the bracket floor, and the linear guide rail is fixed on the floor through bolts. The main material of the bracket is Q235B. There is a fixed sleeve on the bracket for fixing the electric torque wrench, and the radial position of the electric torque wrench is adjusted through the adjustment screw on the sleeve.

10. The gate seal locking device for the nuclear power plant reactor equipment according to claim 1, characterized in that: The material of the sealing lock nut is SA - 540, and the sealing lock nut is connected to the sliding component through an M6*20 pin.

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