A large-diameter threaded hole cleaning device for nuclear power plants

Abstract

The utility model discloses a kind of nuclear power plant large-diameter threaded hole cleaning devices, belong to threaded hole cleaning technical field, including first platform, guide rod, lifting platform, top plate, air pipe, first motor, control panel, control button, support column, fixed block, second motor, first rotating roller, rotating belt, support table, second rotating roller, brush head, second platform, lifting rod, reciprocating screw, limit ring, limit groove, brush.The utility model its structure design can be fixed by fixed block cleaning device, so that staff can appropriately away from cleaning site, reduce the risk of radiation exceeding standard, by the cooperation of first motor and second motor and lifting rod, can make that brush head cleaning is more thorough.

Description

Technical Field

[0001] This utility model relates to the field of thread hole cleaning technology, and in particular to a cleaning device for large-diameter thread holes in nuclear power plants. Background Technology

[0002] During the overhaul of a nuclear power plant reactor, the 54 M170*6 main bolt holes on the reactor pressure vessel require thread cleaning. A search of Chinese patent application CN202320598511.2 reveals a threaded hole cleaning tool. This tool removes impurities from threaded holes. A suction rod extends into the threaded hole and has a suction chamber inside. An inlet communicating with the suction chamber is located on the outer wall of the suction rod, allowing impurities to pass through. A fan is connected to the suction rod, with its air inlet connected to the suction chamber. The fan creates negative pressure in the suction chamber, drawing impurities through the inlet. Furthermore, the tool includes a cleaning brush at the end of the suction rod that extends into the threaded hole. The brush cleans impurities adhering to the hole wall, causing them to fall off. Impurities detached from the hole wall are more easily drawn into the inlet, eliminating the need for a powerful fan and achieving good cleaning results.

[0003] The above-mentioned technical solution requires workers to shake the cleaning tool up and down to allow the cleaning brush to remove the attached impurities. However, when cleaning the threads of the 54 M170*6 main bolt holes of the reactor pressure vessel, the cleaning of the main bolt holes takes a long time in the critical path of the overhaul. The manual cleaning of the 54 bolt holes takes about 13.5 hours. Moreover, the workers cleaning the bolt holes have to work with their hands for a long time, resulting in low cleaning efficiency and an increased risk of personnel exceeding the radiation limit. Utility Model Content

[0004] The purpose of this invention is to solve the problems mentioned in the background art by designing a cleaning device for large-diameter threaded holes in nuclear power plants.

[0005] The technical solution of this utility model to achieve the above objectives is as follows: a cleaning device for large-diameter threaded holes in nuclear power plants, comprising a first platform and a second platform connected by a support column. A control panel is fixedly installed on the first platform, and a top plate is fixedly installed on the top of the control panel. A support platform is fixedly installed at the center of the top surface of the second platform. A second rotating roller is rotatably installed on the support platform. A second motor is fixedly installed on one side of the second rotating roller. A lifting rod is slidably installed at the center of the second rotating roller. The lifting rod is a hollow tube, and a brush head is fixedly installed at the bottom end of the lifting rod. The lifting rod passes upward through the first platform and is then sleeved with a vent pipe. The vent pipe is fixedly installed at the center of the top plate. A reciprocating screw and a guide rod are symmetrically installed between the top plate and the first platform. A first motor is fixedly installed on the top plate, and the output end of the first motor is connected to the reciprocating screw. A lifting platform is installed on the reciprocating screw and the guide rod. The lifting platform is threaded to the reciprocating screw and slidably installed on the guide rod. The lifting platform is rotatably connected to the lower part of the lifting rod. Preferably, the rotating mechanism includes a second motor, which is fixedly mounted on one side of the second rotating roller. The output end of the second motor is rotatably mounted on a first rotating roller, and the first rotating roller and the second rotating roller are connected by a rotating belt.

[0006] Preferably, the rotating mechanism includes a second motor, which is fixedly mounted on one side of the second rotating roller. A first rotating roller is rotatably mounted on the output end of the second motor, and the first rotating roller and the second rotating roller are connected by a rotating belt.

[0007] Preferably, the control panel is provided with several control buttons, which are used to control the operation of each motor.

[0008] Preferably, the center of the brush head is connected to the lifting rod, and the bottom surface of the brush head has a circumferential array of several bristles.

[0009] Preferably, the connection between the lifting platform and the lifting rod is provided with a ring of protrusions, and the lifting rod is provided with a groove to cooperate and fix the protrusions. The lifting platform and the lifting rod are rotatably connected through the protrusions and the grooves.

[0010] Preferably, the bottom end of the vent pipe is provided with a limiting ring, and the top end of the lifting rod is provided with a corresponding limiting groove. The diameter of the hollow portion below the limiting groove is smaller than the diameter of the limiting groove, which facilitates increasing the airflow velocity.

[0011] Preferably, a fixing block is fixedly installed symmetrically about the center on the bottom surface of the second platform, and the fixing block is made of rubber.

[0012] Preferably, the second rotating roller has several vertical protrusions inside, and the lower half of the lifting rod has a corresponding vertical groove. The length of the vertical groove is greater than that of the vertical protrusion, and the excess length of the vertical groove is greater than the lifting stroke of the lifting rod. The lifting rod and the second rotating roller are slidably connected through the vertical groove and the vertical protrusion.

[0013] Beneficial effects: This invention provides a cleaning device for large-diameter threaded holes in nuclear power plants, which has the following advantages: Through its structural design, the device utilizes the cooperation of a first and second motor to enable the lifting rod to perform lifting and rotation movements, allowing the brush head to clean impurities adhering to the threaded hole wall without manual intervention. These impurities are then removed by airflow through the vent pipe. The device can be fixed above the threaded hole to be cleaned via a fixing block on the second platform, allowing workers to move away from the cleaning location and reduce the risk of radiation exceeding limits. Furthermore, the device only requires the worker to install it on the threaded hole and press a control button to begin cleaning, reducing workload and improving work efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a large-diameter threaded hole cleaning device for nuclear power plants according to the present invention; Figure 2 This is a front view of the structural schematic diagram of the large-diameter threaded hole cleaning device for nuclear power plants described in this utility model; Figure 3 This is a top view schematic diagram of the structure of the present invention; Figure 4 This is a structural schematic diagram of the AA cross-section described in this utility model.

[0015] In the diagram, 1. First platform; 2. Guide rod; 3. Lifting platform; 4. Top plate; 5. Ventilation pipe; 6. First motor; 7. Control panel; 8. Control button; 9. Support column; 10. Fixing block; 11. Second motor; 12. First rotating roller; 13. Rotating belt; 14. Support platform; 15. Second rotating roller; 16. Brush head; 17. Second platform; 18. Lifting rod; 19. Reciprocating screw; 20. Limit ring; 21. Limit groove; 22. Brush. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-4 This utility model provides a technical solution: a cleaning device for large-diameter threaded holes in nuclear power plants, comprising a first platform 1 connected to a second platform 17 via a support column 9. A control panel 7 is fixedly installed on the first platform 1, and a top plate 4 is fixedly installed on the top of the control panel 7. A support platform 14 is fixedly installed at the center of the top surface of the second platform 17, and a second rotating roller 15 is rotatably installed on the support platform 14. A rotating mechanism is fixedly installed on one side of the second rotating roller 15, and a lifting rod 18 is slidably installed at the center of the second rotating roller 15. The lifting rod 18 is a hollow tube, and a brush head 16 is fixedly installed at the bottom end of the lifting rod 18. The lifting rod 18 passes upward through the first platform 17. Platform 1 is then fitted with a vent pipe 5, which is connected to an air pump. The vent pipe 5 is fixedly installed at the center of the top plate 4. A reciprocating screw 19 and a guide rod 2 are symmetrically installed between the top plate 4 and the first platform 1. A first motor 6 is fixedly installed on the top plate 4. The output end of the first motor 6 is connected to the reciprocating screw 19. The other end of the reciprocating screw 19 is rotatably installed on the first platform 1. The guide rod 2 is fixedly installed between the first platform 1 and the top plate 4. A lifting platform 3 is installed on the reciprocating screw 19 and the guide rod 2. The lifting platform 3 is threadedly connected to the reciprocating screw 19 and slidably installed on the guide rod 2. The lifting platform 3 is rotatably connected to the lower part of the lifting rod 18.

[0018] The rotating mechanism includes a second motor 11, which is fixedly mounted on one side of the second rotating roller 15. A first rotating roller 12 is rotatably mounted on the output end of the second motor 11. The first rotating roller 12 and the second rotating roller 15 are connected by a rotating belt 13, which transmits the power of the second motor 11 to the second rotating roller 15, causing the lifting rod 18 to rotate, which in turn drives the brush head 16 to rotate. The control panel 7 has several control buttons 8 for controlling the operation of each motor, facilitating operation by the staff. The center of the brush head 16 is connected to the hollow part of the lifting rod 18, allowing impurities to be sucked out through the internal space of the lifting rod 18. Several bristles 22 are arranged in a circular array on the bottom surface of the brush head 16. The connection between the lifting platform 3 and the lifting rod 18 is provided with a ring of protrusions, and the lifting rod 18 is provided with grooves that cooperate to fix the protrusions. The lifting platform 3 and the lifting rod 18 are rotatably connected through the protrusions and grooves, so that the lifting rod 18 can rotate within the lifting platform 3, thereby ensuring that the lifting platform 3 does not affect the rotation of the lifting rod 18 when it drives the lifting rod 18 to rise and fall.

[0019] A limiting ring 20 is provided at the bottom of the vent pipe 5, and a corresponding limiting groove 21 is provided inside the top of the lifting rod 18. The diameter of the hollow part below the limiting groove 21 is smaller than the diameter of the limiting groove 21, which facilitates the increase of airflow velocity and makes it easier to remove impurities. A fixing block 10 is fixedly installed symmetrically about the center on the bottom surface of the second platform 17. The fixing block 10 is made of rubber and can be installed in the adjacent threaded holes that need to be cleaned, so that the cleaning device can be fixed. The rubber material can increase the friction of the fixing block 10 and make the fixation more stable. The second rotating roller 15 has several vertical protrusions inside, and the lower half of the lifting rod 18 has a corresponding vertical groove. The length of the vertical groove is greater than the vertical protrusion, so that the lifting rod 18 can slide up and down in the second rotating roller 15. The excess length of the vertical groove is greater than the lifting stroke of the lifting rod 18. The lifting rod 18 and the second rotating roller 15 are slidably connected through the vertical groove and the vertical protrusion.

[0020] Those skilled in the art should connect all electrical components and their compatible power supplies in this case via wires, and should select appropriate controllers according to actual conditions to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical connections between the various electrical components are completed in sequence. The detailed connection methods are well-known technologies in the field. The following mainly introduces the working principle and process, and will not describe the electrical control further.

[0021] In this implementation plan: During operation, first connect the suction pump to the ventilation pipe 5, then install the fixing block 10 into the adjacent threaded hole that needs to be cleaned, so that the cleaning device can be fixed. Then, the operator can press the control button 8 on the control panel 7 to move away from the cleaning device appropriately to reduce the risk of radiation exceeding the standard. After pressing the control button 8, the first motor 6 and the second motor 11 can be controlled respectively. The first motor 6 controls the reciprocating screw 19 to rotate, so that the lifting platform 3 performs reciprocating lifting and lowering movements on the reciprocating screw 19 and the guide rod 2, thereby driving the brush head 16 at the bottom of the lifting rod 18 to move up and down, so that the brush can clean the impurities attached to the wall of the threaded hole. The second motor 11 controls the first rotating roller 12 to rotate, which in turn drives the second rotating roller 15 to rotate through the rotating belt 13, thereby causing the brush head 16 at the bottom of the lifting rod 18 to rotate, so that the brush 22 can rotate to clean the impurities attached to the wall of the threaded hole, making the cleaning more thorough. The cleaned impurities can be sucked away through the hollow part of the lifting rod 18. Repeat the above process several times to complete the cleaning of the threaded hole.

Claims

1. A cleaning device for large-diameter threaded holes in nuclear power plants, characterized in that, The system includes a first platform (1) connected to a second platform (17) via a support column (9). A control panel (7) is fixedly installed on the first platform (1), and a top plate (4) is fixedly installed on the top of the control panel (7). A support platform (14) is fixedly installed at the center of the top surface of the second platform (17). A second rotating roller (15) is rotatably installed on the support platform (14). A rotating mechanism is fixedly installed on one side of the second rotating roller (15). A lifting rod (18) is slidably installed at the center of the second rotating roller (15). The lifting rod (18) is a hollow tube. A brush head (16) is fixedly installed at the bottom of the lifting rod (18). (18) Passes upward through the first platform (1) and is then fitted with a vent pipe (5). The vent pipe (5) is fixedly installed at the center of the top plate (4). A reciprocating screw (19) and a guide rod (2) are symmetrically installed between the top plate (4) and the first platform (1). A first motor (6) is fixedly installed on the top plate (4). The output end of the first motor (6) is connected to the reciprocating screw (19). A lifting platform (3) is installed on the reciprocating screw (19) and the guide rod (2). The lifting platform (3) is threaded to the reciprocating screw (19) and slidably installed on the guide rod (2). The lifting platform (3) is rotatably connected to the lower part of the lifting rod (18).

2. The cleaning device for large-diameter threaded holes in nuclear power plants according to claim 1, characterized in that, The rotating mechanism includes a second motor (11), which is fixedly installed on one side of the second rotating roller (15). The output end of the second motor (11) is rotatably mounted with a first rotating roller (12). The first rotating roller (12) and the second rotating roller (15) are connected by a rotating belt (13).

3. The cleaning device for large-diameter threaded holes in nuclear power plants according to claim 1, characterized in that, The control panel (7) is equipped with several control buttons (8), which are used to control the operation of each motor.

4. The cleaning device for large-diameter threaded holes in nuclear power plants according to claim 1, characterized in that, The center of the brush head (16) is connected to the lifting rod (18), and the bottom surface of the brush head (16) has several brushes (22) arranged in a circular array.

5. The cleaning device for large-diameter threaded holes in nuclear power plants according to claim 1, characterized in that, The lifting platform (3) and the lifting rod (18) are connected by a ring of protrusions. The lifting rod (18) is provided with a groove to fit and fix the protrusions. The lifting platform (3) and the lifting rod (18) are rotatably connected by the protrusions and the grooves.

6. The cleaning device for large-diameter threaded holes in nuclear power plants according to claim 1, characterized in that, The bottom end of the ventilation pipe (5) is provided with a limiting ring (20), and the top end of the lifting rod (18) is provided with a corresponding limiting groove (21). The diameter of the hollow part below the limiting groove (21) is smaller than the diameter of the limiting groove (21), which facilitates increasing the air flow rate.

7. A cleaning device for large-diameter threaded holes in nuclear power plants according to claim 1, characterized in that, The bottom surface of the second platform (17) is symmetrically fixed with a fixing block (10) about the center, and the fixing block (10) is made of rubber.

8. A cleaning device for large-diameter threaded holes in nuclear power plants according to claim 1, characterized in that, The second rotating roller (15) has several vertical protrusions inside, and the lower half of the lifting rod (18) has a corresponding vertical groove. The length of the vertical groove is greater than that of the vertical protrusion, and the excess length of the vertical groove is greater than the lifting stroke of the lifting rod (18). The lifting rod (18) and the second rotating roller (15) are slidably connected through the vertical groove and the vertical protrusion.

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