Pool steel covering surface leakage checking and positioning device based on multi-channel suction gun

Abstract

The invention discloses a pool steel covering surface leakage checking and positioning tool based on a multi-channel suction gun, relates to the technical field of leakage checking and positioning, and is used for solving the problems that an existing nuclear power unit pool steel covering surface leakage positioning and checking technology is large in operation difficulty and low in checking efficiency. The device comprises a device body of a simple trolley structure, an operation long rod is fixedly connected to a suction gun fixing block on the upper portion of the simple trolley, a helium suction gun is installed on one side of the suction gun fixing block, an air cylinder is further arranged on the simple trolley, and the air cylinder drives a suction cup on a negative pressure component on the lower portion of the simple trolley to suck the simple trolley to the steel covering face. The simple trolley is further provided with a wireless communication and control device used for receiving and transmitting control signals.

Description

Technical Field

[0001] This invention belongs to the field of leakage detection and location technology, specifically relating to a leakage detection and location device for steel-clad water tanks based on a multi-channel suction gun. Background Technology

[0002] As key facilities for safe fuel storage, the refueling pool and spent fuel pool in the nuclear island building of a nuclear power plant have the core functions of maintaining sufficient water layer thickness to achieve biological shielding against radioactive radiation, continuous cooling of residual heat from spent fuel decay, and circulation, purification, and decontamination of pool water under normal operation and accident conditions. From a structural design perspective, both pools adopt a pool-like structure, with their reinforced concrete inner walls and bottom plates protected by austenitic stainless steel cladding. The cladding panels are formed as a whole by butt welding, and the side walls are connected to the bottom plate cladding by fillet welding. The structure is fixed by welding to the pre-embedded concrete supports.

[0003] As nuclear power units age, the risk of leaks in the steel cladding of the water tank increases significantly due to material aging and corrosion. Several water tank leaks have already occurred both domestically and internationally. When the steel cladding is damaged, pool water seeps into the reinforced concrete structure, causing steel corrosion, which weakens the concrete's load-bearing capacity and threatens the overall structural safety. Currently, locating leaks in the steel cladding relies on helium detection technology. This involves continuously injecting helium gas into the leak area on the outside of the steel cladding using specialized equipment, while technicians enter the bottom of the pool on the steel cladding side to locate the leak using helium-sensitive equipment. This leak detection method has the following drawbacks:

[0004] 1) The component pool and spent fuel pool have high radiation doses. Workers must wear radiation protection equipment to enter the pool and be exposed to high levels of radioactivity.

[0005] 2) After wearing anti-radiation equipment, workers move slowly and the internal temperature is high, which places high demands on the physical fitness of the workers.

[0006] 3) Inspecting the steel cladding at higher points in the pool requires the erection of scaffolding, which increases the difficulty of the work;

[0007] 4) Existing inspection techniques are cumbersome and inefficient. Summary of the Invention

[0008] The purpose of this invention is to provide a water pool steel cladding leakage inspection and location device based on a multi-channel suction gun, which solves the problems of high operational difficulty and low inspection efficiency of existing nuclear power unit water pool steel cladding leakage location and inspection technology.

[0009] The technical solution adopted by the present invention to solve its technical problem is: a water tank steel cladding leakage inspection and positioning device based on a multi-channel suction gun, characterized in that the device includes: a device body with a simple trolley structure, an operating rod fixedly connected to a suction gun fixing block on the upper part of the simple trolley, a helium suction gun installed on one side of the suction gun fixing block, a cylinder also provided on the simple trolley, the suction cup on the negative pressure component at the lower part of the simple trolley is driven by the cylinder to adsorb the simple trolley onto the steel cladding, and a wireless communication and controller is also installed on the simple trolley for receiving and transmitting control signals.

[0010] The above-mentioned water tank steel cladding leakage inspection and positioning device based on a multi-channel suction gun is characterized in that the bottom of the suction gun fixing block is fixed on a simple trolley, and the operating rod is connected to the upper end of the suction gun fixing block through a single-section coupling, which allows the operating rod to rotate in the vertical direction of the tool.

[0011] The above-mentioned water tank steel cladding leakage inspection and positioning device based on a multi-channel suction gun is characterized in that the side of the suction gun fixing block is provided with several threaded holes, the helium suction gun is installed after the suction gun fixing block, and then the helium suction gun is fixed by bolts through the threaded holes.

[0012] The above-mentioned water tank steel cladding leakage inspection and positioning device based on a multi-channel suction gun is characterized in that the air inlet end of the helium suction gun is equipped with a multi-channel air inlet pipe, the air outlet end of the helium suction gun is provided with a guide pipe, and the guide pipe is connected to a helium detector on the shore.

[0013] The above-mentioned water tank steel cladding leakage inspection and positioning device based on a multi-channel suction gun is characterized in that the moving mechanism of the simple trolley is the universal casters at the four corners of its bottom, and the universal casters are in direct contact with the steel cladding of the water tank.

[0014] The above-mentioned water tank steel cladding leakage inspection and positioning device based on a multi-channel suction gun is characterized in that a laser rangefinder is provided at the front of the simple trolley to measure the distance between the tool and the water tank wall in real time; a connection hole is also provided on the same side of the laser rangefinder to secure the tool with a long rope to prevent it from falling accidentally.

[0015] The above-mentioned water tank steel cladding leakage inspection and positioning device based on a multi-channel suction gun is characterized in that the negative pressure component is fixed to the bottom of a simple trolley by a fixing block, and the air guide device on the negative pressure component is provided with an air inlet. The air inlet is connected to an air pump device on the shore, and air is injected into the bottom of the suction cup through the air inlet to remove and resolve the negative pressure inside the suction cup.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The water tank steel cladding leakage inspection and location device based on a multi-channel suction gun provided by the present invention, on the one hand, replaces manual inspection with inspection device, reducing the difficulty of leakage inspection and location and reducing the collective dose to operators; on the other hand, through the cooperation of multiple components in the device, the detection efficiency and detection accuracy of leakage inspection and location work can be improved. Attached Figure Description

[0017] Figure 1 The image shown is a side view of a water tank steel cladding leakage detection and positioning device based on a multi-channel suction gun, as described in this invention.

[0018] Figure 2 The diagram shown is a structural schematic of a water tank steel cladding leakage detection and positioning device based on a multi-channel suction gun according to the present invention.

[0019] Figure 3 The diagram shown is a schematic diagram of the negative pressure component of a water tank steel cladding leakage detection and positioning device based on a multi-channel suction gun, as described in this invention.

[0020] Explanation of reference numerals: 1. Operating lever; 2. Cylinder; 3. Single-section coupling; 4. Suction gun fixing block; 5. Multi-channel air inlet pipe; 6. Laser rangefinder; 7. Universal caster; 8. Steel cladding; 9. Suction cup; 10. Helium suction gun; 11. Air guide pipe; 12. Threaded hole; 13. Wireless communication and controller; 14. Fixing block; 15. Connecting hole; 16. Air guiding device; 17. Air inlet; 18. Negative pressure component. Detailed Implementation

[0021] To address the challenges of high operational difficulty and low efficiency in existing nuclear power plant water tank steel cladding leak location and inspection technologies, this invention provides a water tank steel cladding leak inspection and location device based on a multi-channel suction gun, specifically designed for the inspection and precise location of leaks in the steel cladding of nuclear power plant component pools and spent fuel pools. Figures 1-3 As shown, the tool includes: a main body with a simple trolley structure, which serves as the carrier for the various components in the leak detection and positioning device; and an operating rod 1 connected to the upper end of the suction gun fixing block 4 via a single-section coupling 3, which allows the operating rod 1 to rotate a certain angle in the vertical direction of the tool. The operator can use the operating rod 1 to move the leak detection and positioning device.

[0022] The helium suction gun 10 is mounted on one side of the suction gun fixing block 4 via several threaded holes 12. After the helium suction gun 10 is installed on the suction gun fixing block 4, it is then secured with bolts through the threaded holes 12. A multi-channel inlet pipe 5 is installed at the inlet end of the helium suction gun 10. The inlet pipes on the multi-channel inlet pipe 5 are arranged side-by-side to increase the area of ​​steel-coated surfaces that can be inspected at one time, thus improving the efficiency of leak location detection. A gas guide pipe 11 is provided at the outlet end of the helium suction gun 10, and the gas guide pipe 11 is connected to a helium detector on the shore.

[0023] A laser rangefinder 6 is installed at the front of the simple trolley. The laser rangefinder 6 can measure the distance between the leak detection device and the bottom of the water tank, as well as its distance from one end of the water tank, in real time, avoiding the drawbacks of missed or repeated inspections in certain areas during operation. The trolley's movement mechanism consists of four swivel casters 7 at its bottom corners. These casters 7 support the entire leak detection and positioning device and directly contact the steel cladding surface 8 of the water tank. The casters 7 are easy to maneuver, facilitating adjustments to the leak detection and positioning device's position on the steel cladding surface of the water tank and improving the equipment's flexibility.

[0024] The simple cart is also equipped with a cylinder 2. When the tool reaches the designated position, the cylinder 2 is activated, extending to drive the suction cup 9 on the negative pressure component 18 at the bottom of the cart, adhering the cart to the steel surface 8. During contact, the air inside the suction cup 9 is expelled, creating negative pressure, thus fixing the device to the steel surface 8. The negative pressure component 18 is fixed to the bottom of the simple cart by a fixing block 14. The air guiding device 16 on the negative pressure component 18 is equipped with an air inlet 17, which is connected to an air pump device on the shore. Air is injected into the bottom of the suction cup 9 through the air inlet 17 to remove the negative pressure inside the suction cup 9. After the leak detection and positioning device has completed leak detection in the current area, the air pump operates, injecting air into the suction cup 9 through the air inlet pipe 17 to resolve the negative pressure problem inside the suction cup 9. At the same time, the cylinder 2 is activated, retracting to lift the suction cup 9 away from the steel surface 8. After the leak detection and positioning device is adjusted to the new position, cylinder 2, negative pressure component 18 and air pump repeat the above movements.

[0025] The simple trolley is also equipped with a wireless communication controller 13 for sending and receiving control signals, reducing the use of communication cables. Only one power cord is needed to complete the communication between the wireless communication controller 13 and the onshore control box, thereby reducing the weight and operational difficulty of the leak detection and location device. To prevent the leak detection and location device from accidentally falling, a connection hole 15 is also provided on the same side as the laser rangefinder 6. The connection hole 15 is secured with a long rope, improving the safety of the leak detection and location device.

[0026] After the leak detection and locating device is fully assembled, first ensure that all components are connected and installed correctly, confirming that each interface is properly connected without any misalignment or looseness. Once confirmed, test the tool by turning on the power switch and checking its operational status, including the working status of cylinder 2 and the negative pressure component 18. After everything is ready, the search for the leak location on the steel cladding 8 of the water tank can begin.

[0027] It should be noted that the combination of the technical features in the embodiments of the present invention is not limited to the combination methods described in the embodiments of the present invention or the combination methods described in the specific embodiments. All technical features described in the present invention can be freely combined or combined in any way, unless there is a contradiction between them.

[0028] 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, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A leak detection and positioning device for steel-clad surfaces of water tanks based on a multi-channel suction gun, characterized in that, The device includes: a main body with a simple trolley structure, an operating rod (1) fixedly connected to the suction gun fixing block (4) on the upper part of the simple trolley, a helium suction gun (10) installed on one side of the suction gun fixing block (4), a cylinder (2) is also provided on the simple trolley, and the suction cup (9) on the negative pressure component (18) at the lower part of the simple trolley is driven by the cylinder (2) to adsorb the simple trolley onto the steel cover (8), and a wireless communication and controller (13) is also installed on the simple trolley to receive and send control signals.

2. The water tank steel cladding leakage detection and positioning device based on a multi-channel suction gun according to claim 1, characterized in that, The bottom of the suction gun fixing block (4) is fixed on the simple trolley. The operating rod (1) is connected to the upper end of the suction gun fixing block (4) through a single-section coupling (3). The operating rod (1) can be rotated in the vertical direction of the tool through the single-section coupling (3).

3. The water tank steel cladding leakage detection and positioning device based on a multi-channel suction gun according to claim 1, characterized in that, The suction gun fixing block (4) has several threaded holes (12) on its side. After the helium suction gun (10) is installed on the suction gun fixing block (4), the helium suction gun (10) is fixed by bolts through the threaded holes (12).

4. The water tank steel cladding leakage detection and positioning device based on a multi-channel suction gun according to claim 1, characterized in that, The helium suction gun (10) has a multi-channel air inlet pipe (5) installed at the air inlet end, and a gas guide pipe (11) is provided at the air outlet end of the helium suction gun (10). The gas guide pipe (11) is connected to the helium detector on the shore.

5. A water tank steel cladding leakage detection and positioning device based on a multi-channel suction gun according to claim 1, characterized in that, The movement mechanism of the simple trolley is the swivel casters (7) at the four corners of its bottom, and the swivel casters (7) are in direct contact with the steel cladding (8) of the pool.

6. The water tank steel cladding leakage detection and positioning device based on a multi-channel suction gun according to claim 1, characterized in that, The front of the simple cart is equipped with a laser rangefinder (6) to measure the distance between the tool and the pool wall in real time; a connection hole (15) is also provided on the same side of the laser rangefinder (6) so that a long rope can be used to tie it tightly to prevent the tool from falling accidentally.

7. A water tank steel cladding leakage detection and positioning device based on a multi-channel suction gun according to claim 1, characterized in that, The negative pressure component (18) is fixed to the bottom of the simple cart by a fixing block (14). The air guide device (16) on the negative pressure component (18) is provided with an air inlet (17). The air inlet (17) is connected to the air pump device on the shore. Air is pumped into the bottom of the suction cup (9) through the air inlet (17) to remove and resolve the negative pressure inside the suction cup (9).

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