An ultrasonic-based overhaul device for a gate oil cylinder of a hydropower station

Abstract

The application belongs to the field of hydraulic engineering, and particularly relates to a gate oil cylinder overhaul device for a hydropower station based on ultrasonic waves, which comprises an overhaul ring, wherein the overhaul ring is arranged in the form of a notched ring, the overhaul ring is composed of a center lining plate, a side lining plate one and a side lining plate two, the output end of a speed reducer is fixedly connected with a transmission arm, two transmission arms are respectively fixedly connected with the end portions of the side lining plate one and the side lining plate two, the middle portion of the side lining plate one is provided with an ultrasonic wave leakage detector, and the outer side of the side lining plate two is provided with a thermal imager. Through the arrangement, the oil cylinder can be comprehensively detected for flaws and leakage, the detection process can be completed without disassembling the oil cylinder, the equipment can automatically crawl on the surface of the oil cylinder, the detection information can be transmitted to a terminal in a wireless transmission mode in real time, the manual operation difficulty and operation risk are greatly reduced, and the oil cylinder which is large in size and is located in a relatively tricky position can also be comprehensively detected.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering, specifically an ultrasonic-based maintenance device for hydraulic cylinders of hydropower station gates. Background Technology

[0002] A hydropower station is a comprehensive water conservancy project that converts the potential and kinetic energy of water into electrical energy. Its core principle is to use the water level difference created by the dam to guide the water flow through the pressure pipeline to impact the turbine, which drives the coaxial generator to rotate and generate electricity. The gate is a crucial control and safety facility in a hydropower station. It is installed in key locations such as the reservoir, water diversion canal, and turbine inlet. Its main functions are to regulate the flow, cut off the water flow, and discharge floodwater and sediment.

[0003] Gate cylinders (usually large hydraulic cylinders) are the core actuators of the gate opening and closing system of hydropower stations. They are responsible for providing huge linear thrust or tension to precisely control the lifting and opening of the massive gates. Regular maintenance of the cylinders is the key to ensuring the reliability of the hydraulic system and the safety of the equipment. It can proactively detect and eliminate hidden dangers such as seal aging, inner wall wear, and cavitation, prevent sudden leaks or jamming failures, and avoid unplanned downtime and secondary damage.

[0004] Traditional hydraulic cylinder inspection devices often rely on operators carrying the equipment and using handheld devices to conduct comprehensive inspections of the hydraulic cylinders. However, hydraulic cylinders for hydropower station gates are often large in size and their installation locations are inconvenient for manual access, making it difficult to ensure that the testing end of the equipment fits snugly against various parts of the hydraulic cylinder during the inspection process, which greatly affects the inspection results.

[0005] Therefore, the present invention provides an ultrasonic-based maintenance device for hydraulic cylinders of hydropower station gates. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides an ultrasonic-based maintenance device for the hydraulic cylinder of a hydropower station gate, comprising a maintenance ring, wherein the maintenance ring is arranged in a notched ring shape, the maintenance ring is composed of a central liner plate, a first side liner plate, and a second side liner plate, both ends of the central liner plate are fixedly connected to a reduction motor, the output end of the reduction motor is fixedly connected to a transmission arm, the two transmission arms are respectively fixedly connected to the ends of the first side liner plate and the second side liner plate, an ultrasonic leakage detector is installed in the middle of the first side liner plate, a thermal imager is arranged on the outer side of the second side liner plate, and multiple electric casters are arranged on the inner ring of the maintenance ring; With this setup, the hydraulic cylinder can be thoroughly inspected for flaws and leaks without disassembling it. The equipment can crawl on the surface of the hydraulic cylinder and transmit the inspection information to the terminal in real time via wireless transmission, which greatly reduces the difficulty and danger of manual operation. It can also perform a comprehensive inspection of hydraulic cylinders that are large or located in tricky places. Preferably, the central liner is equipped with a detachable and detachable fixed suction cup. The fixed suction cup has a built-in negative pressure module and also includes an auxiliary telescopic rod to assist in the movement of the fixed suction cup. Many hydropower station cylinders are installed far from the ground, making it difficult for operators to attach the equipment to the cylinder. With the detachable fixed suction cup, the operator can use the auxiliary telescopic rod, the end of which is fixed to the fixed suction cup. Using the longer auxiliary telescopic rod, the detached fixed suction cup is negatively pressure-adhesively attached to the cylinder surface. Then, the fixed suction cup is pulled back to pull the entire central liner back, bringing the central liner and the entire equipment into contact with the cylinder. During equipment movement, the auxiliary telescopic rod can assist in lifting the equipment and assisting in the pull-back process. This design allows for regular maintenance of cylinders in hard-to-reach installation locations, ensuring the safe operation of the cylinders.

[0008] Preferably, a winding device is fixedly connected to the outer side of the center liner plate. The winding device has a rotating electric roller inside, and a steel cable is wound around the outer side of the electric roller. The steel cable is fixed to the bottom of the fixed suction cup. After the fixed suction cup is fixed, the electric roller in the winding device slowly winds the steel cable, and as the steel cable is wound, the center liner plate is continuously pulled to the surface of the hydraulic cylinder. After the center liner plate has moved, the state of the center liner plate is gradually adjusted by the electric caster to ensure the clamping stability of the side liner plate one and side liner plate two during the closing process.

[0009] Preferably, the inner ring of the central liner has a recessed adapter groove, the bottom surface of the fixed suction cup is fixed with a magnetic block, and multiple connecting valves are installed in the adapter groove. After the inspection ring is fixed, the fixed suction cup is released, and the steel cable continues to roll back to fix the fixed suction cup into the adapter groove, allowing the inspection ring to move normally. The connecting valves and the magnetic block are magnetically paired to ensure the stability of the connection.

[0010] Preferably, the bottom of the auxiliary telescopic rod is fixedly connected to a handle, and the end of the auxiliary telescopic rod is equipped with a universal joint. Two elastic connecting arms are fixedly connected to the outer side of the universal joint, and the ends of the connecting arms are fixedly connected to suction blocks. When the connecting arms connect to the fixed suction cup, they are fixed by the suction blocks and magnetic blocks. At the same time, the two elastic connecting arms open to clamp the bottom of the fixed suction cup, and magnetic attraction is performed at the same time to ensure a firm clamping effect on the fixed suction cup. Meanwhile, the universal joint can rotate at multiple angles, allowing the end of the fixed suction cup to be perpendicular to the hydraulic cylinder, ensuring a firm suction fixation process. The auxiliary telescopic rod can be electrically or pneumatically operated to complete the automatic control of telescopic extension.

[0011] Preferably, an expansion ring is fixedly connected to the outer side of the winding device, an electromagnet module is built into the adsorption block, a round rod is fixedly connected between the fixed suction cup and the steel cable, and an ejection structure is installed in the adapter slot. The electromagnet module can control the magnetic force of the adsorption block by energizing it, facilitating the adsorption and release process of the fixed suction cup. When the maintenance ring needs to be removed, the ejection structure in the adapter slot can be used to push the fixed suction cup outward, while releasing the steel cable to let the fixed suction cup fall outward. At this time, the auxiliary telescopic rod can be used to fix the fixed suction cup. First, pull the fixed suction cup back and fix it randomly on the nearby ground, and then guide the maintenance ring back into place. Similarly, the auxiliary telescopic rod can also be used for support, and can directly grasp the expansion ring or other parts. The expansion ring can be made of a high magnetic attraction material to improve the adsorption force.

[0012] Preferably, an electrically operated telescopic sleeve facing the inner ring is fixedly connected to the middle of the first side liner. The moving end of the electrically operated telescopic sleeve is connected to the ultrasonic leak detector. Both the upper and lower ends of the second side liner are fixedly connected to electrically operated slide rails, which are inclined. The moving end of the electrically operated slide rails is fixedly connected to the thermal imager. The translation of the ultrasonic leak detector can be controlled by the electrically operated telescopic sleeve to ensure that the probe of the instrument can be in contact with the surface of the cylinder, thereby adapting to different clamping states and ensuring smooth operation of the instrument probe. In order to improve the shooting effect of the thermal imager, the distance between the thermal imager and the cylinder can be adjusted by the electrically operated slide rail, thereby controlling the image captured during shooting; further ensuring the comprehensive detection effect of the cylinder.

[0013] Preferably, the center liner, side liner one, and side liner two are each provided with multiple movable slots in their middle portions. An electric telescopic rod is installed in each movable slot. The end of the electric telescopic rod is fixedly connected to an electric universal wheel. A spring is fixedly connected to the outer side of the electric telescopic rod and the wall of the movable slot. In order to accommodate cylinders of different diameters, after the inspection ring is fixed, the electric universal wheel can be pushed outward by controlling the electric telescopic rod. At the same time, under the reaction force of the spring, a strong transmission connection between the electric universal wheel and the cylinder is ensured.

[0014] Preferably, the fixed suction cup is divided into an absorption end and a connecting end. The connecting end is made of a solid material and connected to a steel cable, while the absorption end is made of an elastic material. The outer surface of the absorption end is covered with suction holes. Since the outer side of the oil cylinder is basically an outwardly convex arc, in order to ensure the adsorption effect of the fixed suction cup, the end of the fixed suction cup is made of an elastic material. After contacting the outer side of the oil cylinder, it can deform into the same arc shape as the oil cylinder. Since the ends are all made of elastic material, they will deform under negative pressure adsorption, increasing the negative pressure adsorption effect. At the same time, the connecting end is equipped with a pressure relief valve for releasing pressure when the adsorption is released.

[0015] Preferably, the fixed suction cup has a negative pressure hole in the center of its top surface, and the outer side of the fixed suction cup is covered with a covering layer. The outer surface of the covering layer has multiple suction holes. By concentrating the negative pressure holes in the center and using the covering layer to diffuse the suction, the fixed suction cup can still be attached to the outside of the oil cylinder as a whole. This can improve the central suction and prevent the loss of negative pressure due to the surrounding lifting.

[0016] The beneficial effects of this invention are as follows: 1. The ultrasonic-based hydraulic cylinder inspection device for hydropower station gates described in this invention, through the arrangement of a central liner, a first side liner, and a second side liner, can comprehensively inspect and detect flaws and leaks in the hydraulic cylinder without disassembling it. The device can also crawl autonomously across the cylinder surface and transmit the inspection information wirelessly to a terminal in real time, greatly reducing the difficulty and danger of manual operation. It can also perform comprehensive inspections on large and difficult-to-access hydraulic cylinders.

[0017] 2. The ultrasonic-based maintenance device for hydroelectric gate cylinders of a hydroelectric power station, as described in this invention, utilizes a detachable fixed suction cup. An auxiliary telescopic rod, with its end fixed to the fixed suction cup, is used by the operator to apply negative pressure to fix the detached fixed suction cup to the cylinder surface. The fixed suction cup then pulls back the entire central liner, bringing the central liner and the entire device into contact with the cylinder. During device movement, the auxiliary telescopic rod assists in lifting the device and aiding in the pull-back process. This design allows for regular maintenance of cylinders in hard-to-reach locations, ensuring the cylinder's operational safety. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the inspection ring of the present invention; Figure 3 This is a perspective view of the central liner of the present invention; Figure 4 This is a perspective view of the central liner and the fixed suction cup of the present invention; Figure 5 This is a perspective view of the first side liner and the second side liner of the present invention; Figure 6 This is a perspective view of the suction cup fixing device of the present invention; Figure 7 This is a perspective view of the auxiliary telescopic rod of the present invention; In the diagram: 1. Inspection ring; 2. Auxiliary telescopic rod; 3. Central liner; 4. Side liner one; 5. Side liner two; 6. Fixed suction cup; 7. Electric universal wheel; 8. Electric telescopic rod; 9. Winder; 10. Drive arm; 11. Magnetic block; 12. Expansion ring; 13. Adaptor groove; 14. Connecting valve; 15. Electric telescopic sleeve; 16. Ultrasonic leak detector; 17. Thermal imager; 18. Electric slide rail; 19. Negative pressure hole; 20. Covering layer; 21. Steel cable; 22. Handle; 23. Universal shaft; 24. Adsorption block; 25. Connecting arm; 26. Gear motor. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] like Figures 1 to 7 As shown in the embodiment of the present invention, a hydroelectric power station gate cylinder maintenance device based on ultrasound includes a maintenance ring 1. The maintenance ring 1 is arranged in a notched ring shape. The maintenance ring 1 is composed of a central liner 3, a first side liner 4, and a second side liner 5. A reduction motor 26 is fixedly connected to both ends of the central liner 3. A transmission arm 10 is fixedly connected to the output end of the reduction motor 26. The two transmission arms 10 are respectively fixedly connected to the ends of the first side liner 4 and the second side liner 5. An ultrasonic leakage detector 16 is installed in the middle of the first side liner 4. A thermal imager 17 is arranged on the outer side of the second side liner 5. A plurality of electric universal wheels 7 are arranged on the inner ring of the maintenance ring 1. The middle of the side liner 4 is fixedly connected to an electric telescopic sleeve 15 facing the inner ring direction. The moving end of the electric telescopic sleeve 15 is connected to the ultrasonic leak detector 16. Both the upper and lower ends of the side liner 5 are fixedly connected to electric slide rails 18. The electric slide rails 18 are inclined. The moving end of the electric slide rails 18 is fixedly connected to the thermal imager 17. The inspection ring 1 has a built-in wireless communication module and a rechargeable power supply, both of which are electrically connected to the ultrasonic leak detector 16 and the thermal imager 17. During operation, the equipment is carried to the cylinder to be inspected. Side liner 1 (4) and side liner 2 (5) are rotated outwards to open, and the inspection ring 1 is placed on the outside of the cylinder. Simultaneously, the reduction motor 26 is started to control the two transmission arms 10, rotating and retracting side liner 1 (4) and side liner 2 (5), thus fixing itself to the outside of the cylinder. The largest diameter cylinder that the inspection ring 1 can fix is ​​the cylinder with the same curvature as the central liner 3. The inspection ring 1 is a three-quarter ring, which can securely fasten to the outside of the cylinder. When the cylinder diameter is small, as the side liner 1 (4) and side liner 2 (5) continue to retract inwards, a smaller clamping area can be formed between the three liner plates, thus accommodating cylinders of various diameters. Simultaneously, the multiple electric casters 7 allow for remote control of the electric casters 7 to turn or rotate after the inspection ring 1 is in contact with the outside of the cylinder, thereby driving the entire inspection ring 1 to crawl along the outside of the cylinder. After moving to the predetermined position, it is then detected by an ultrasonic leak detector. The probe 16 is attached to the surface of the oil cylinder and can capture high-frequency ultrasonic waves that are imperceptible to the human ear, converting them into audible or visual signals. When there is damage to the surface of the oil cylinder and gas or liquid leaks, turbulence or pressure difference will generate high-frequency ultrasonic signals at the leak point. The detector receives these signals through a highly sensitive piezoelectric or capacitive ultrasonic sensor. Through multi-point detection, the closer to the leak point, the stronger the signal strength. During the movement of the equipment, the thermal imager 17 works simultaneously. The thermal imager 17 converts the invisible infrared radiation emitted by the object into a visible thermal image, performing non-contact and rapid screening and positioning based on temperature differences. For example, when hot oil leaks in the oil cylinder, there will be a clear difference in the thermal image. Through the cooperation of the two instruments, the equipment moves back and forth on the outer surface of the oil cylinder. During the movement, the angle of the equipment is adjusted by the electric universal wheels 7, thereby recording thermal images of both sides of the entire oil cylinder. Furthermore, the translation of the ultrasonic leak detector 16 can be controlled by the electric telescopic sleeve 15, ensuring that the probe of the instrument can fit against the surface of the oil cylinder, thereby adapting to different clamping states; in order to improve the shooting effect of the thermal imager 17, the distance between the thermal imager 17 and the oil cylinder can be adjusted by the electric slide rail 18, thereby controlling the image captured during shooting; further ensuring the comprehensive detection effect of the oil cylinder. With this setup, the hydraulic cylinder can be thoroughly inspected for flaws and leaks without disassembling it. The equipment can crawl on the surface of the hydraulic cylinder and transmit the inspection information to the terminal in real time via wireless transmission, which greatly reduces the difficulty and danger of manual operation. It can also perform a comprehensive inspection of hydraulic cylinders that are large or located in tricky places. The inspection ring 1 has a built-in wireless communication module that is electrically connected to the ultrasonic leak detector 16 and the thermal imager 17, enabling real-time wireless communication with the external control system and transmitting detection data to the external system in real time. At the same time, the inspection ring 1 has a built-in rechargeable power supply to provide power to the two devices, ensuring energy supply during equipment operation.

[0022] The center liner 3 is equipped with a fixed suction cup 6 that can be merged and split. The fixed suction cup 6 has a built-in negative pressure module and also includes an auxiliary telescopic rod 2 for assisting the fixed suction cup 6 in moving. During operation, many hydropower station hydraulic cylinders are installed far from the ground, making it difficult for operators to attach the equipment to the cylinder. In this case, a detachable suction cup 6 allows the operator to use an auxiliary telescopic rod 2. The end of the auxiliary telescopic rod 2 is fixed to the suction cup 6. Using the longer auxiliary telescopic rod 2, the detached suction cup 6 is attached to the cylinder surface using negative pressure suction. Then, the suction cup 6 pulls back the entire central liner 3, bringing the central liner 3 and the entire equipment into contact with the cylinder. During equipment movement, the auxiliary telescopic rod 2 can assist in lifting the equipment and aiding in the pull-back process. This design allows for regular maintenance of cylinders in hard-to-reach locations, ensuring the cylinder's operational safety.

[0023] A winding device 9 is fixedly connected to the outer side of the center liner 3. The winding device 9 has an electric roller that can rotate inside. A steel cable 21 is wound around the outer side of the electric roller. The steel cable 21 is fixedly connected to the bottom of the fixed suction cup 6. During operation, after the fixed suction cup 6 is fixed, the electric roller in the winding device 9 slowly winds the cable 21, continuously pulling the center liner 3 to the surface of the cylinder. After the center liner 3 has moved, the state of the center liner 3 is gradually adjusted by the electric caster 7 to ensure the clamping stability of the side liner 1 4 and side liner 2 5 during the closing process.

[0024] The inner ring of the central liner 3 has a recessed adapter groove 13, the bottom surface of the fixed suction cup 6 is fixed with a magnetic suction block 11, and multiple connecting valves 14 are installed in the adapter groove 13. During operation, once the inspection ring 1 is fixed, the fixing suction cup 6 is released, and at the same time, the steel cable 21 continues to rewind, fixing the fixing suction cup 6 into the adapter groove 13, allowing the inspection ring 1 to move normally; the connecting valve 14 and the magnetic block 11 are magnetically paired to ensure the stability of the connection.

[0025] The bottom of the auxiliary telescopic rod 2 is fixedly connected to a handle 22, and the end of the auxiliary telescopic rod 2 is equipped with a universal shaft 23. Two elastic connecting arms 25 are fixedly connected to the outside of the universal shaft 23, and an adsorption block 24 is fixedly connected to the end of the connecting arm 25. During operation, when the connecting arm 25 connects to the fixed suction cup 6, it is fixed by the adsorption block 24 and the magnetic block 11. At the same time, the two elastic connecting arms 25 open to clamp the bottom of the fixed suction cup 6 and magnetically fix it at the same time to ensure a firm gripping effect on the fixed suction cup 6. Meanwhile, the universal shaft 23 can rotate at multiple angles to allow the end of the fixed suction cup 6 to be perpendicular to the hydraulic cylinder, ensuring a firm adsorption and fixation process. The auxiliary telescopic rod 2 can be electric or pneumatic to complete the automatic control telescopic function.

[0026] An expansion ring 12 is fixedly connected to the outside of the winding device 9, an electromagnet module is built into the adsorption block 24, a round rod is fixedly connected between the fixed suction cup 6 and the steel cable 21, and an ejection structure is installed in the adapter groove 13. During operation, the electromagnet module can control the magnetic force of the adsorption block 24 by energizing it, facilitating the adsorption and release process of the fixed suction cup 6. When the inspection ring 1 needs to be removed, the ejection structure in the adapter slot 13 can be used to push the fixed suction cup 6 outward, while releasing the steel cable 21 to let the fixed suction cup 6 fall outward. At this time, the auxiliary telescopic rod 2 can be used to fix the fixed suction cup 6. First, pull the fixed suction cup 6 back and fix it randomly on the nearby ground, and then guide the inspection ring 1 to return to its original position. Similarly, the auxiliary telescopic rod 2 can also be used for support, and can directly grasp the part of the expansion ring 12 or other parts. The expansion ring 12 can be made of a high magnetic attraction material to improve the adsorption force.

[0027] The center liner 3, side liner 1 4 and side liner 2 5 are each provided with multiple moving slots in the middle. An electric telescopic rod 8 is provided in the moving slot. The end of the electric telescopic rod 8 is fixedly connected to the electric universal wheel 7. The electric telescopic rod 8 is slidably engaged with the moving slot. A spring is fixedly connected to the outer side of the electric telescopic rod 8 and the wall of the moving slot. During operation, in order to accommodate hydraulic cylinders of different diameters, after the inspection ring 1 is fixed, the electric universal wheel 7 can be pushed outward by the electric telescopic rod 8. At the same time, under the reaction force of the spring, the electric universal wheel 7 is guaranteed to have a strong transmission connection with the hydraulic cylinder.

[0028] The fixed suction cup 6 is divided into an absorption end and a connecting end. The connecting end is made of solid material and is connected to the steel cable 21. The absorption end is made of elastic material and the outer surface of the absorption end is covered with suction holes. During operation, since the outer side of the oil cylinder is basically an outwardly convex arc, in order to ensure the adsorption effect of the fixed suction cup 6, the end of the fixed suction cup 6 is made of elastic material. After contacting the outer side of the oil cylinder, it can be deformed into the same arc shape as the oil cylinder. Since the end is made of elastic material, it will deform itself under negative pressure adsorption, increasing the negative pressure adsorption effect. At the same time, the connection end is equipped with a pressure relief valve to release pressure when the adsorption is released.

[0029] The fixed suction cup 6 has a negative pressure hole 19 in the middle of its top surface, and the fixed suction cup 6 is wrapped with a covering layer 20. The outer surface of the covering layer 20 has multiple suction holes. During operation, by concentrating the negative pressure hole 19 in the center and using the covering layer 20 to diffuse the suction, the fixed suction cup 6 can still be attached to the outside of the oil cylinder as a whole. This can improve the central suction and prevent the loss of negative pressure due to the surrounding lifting.

[0030] During operation, the equipment is carried to the cylinder to be inspected. Side liner 1 (4) and side liner 2 (5) are rotated outwards to open, and the inspection ring 1 is placed on the outside of the cylinder. Simultaneously, the reduction motor 26 is started to control the two transmission arms 10, causing side liner 1 (4) and side liner 2 (5) to rotate and retract, thus fixing themselves to the outside of the cylinder. The largest diameter cylinder that the inspection ring 1 can fix is ​​the cylinder with the same arc as the central liner 3. The inspection ring 1 is a three-quarter ring, which can securely fasten to the outside of the cylinder. When the cylinder diameter is smaller, as the side liner 1 (4) and side liner 2 (5) continue to retract inwards, the inspection ring can... This design creates a smaller clamping area between the three liners, accommodating cylinders of various diameters. Simultaneously, the multiple electric casters 7 allow for remote steering or rotation of the casters after the inspection ring 1 is in contact with the outside of the cylinder. This causes the inspection ring 1 to crawl along the outside of the cylinder. Once at a predetermined position, the probe of the ultrasonic leak detector 16, which is in contact with the cylinder surface, captures high-frequency ultrasonic waves imperceptible to the human ear and converts them into audible or visual signals. If there is damage to the cylinder surface, indicating a gas or liquid leak, the detector will detect the leak. When turbulence or pressure difference occurs, high-frequency ultrasonic signals are generated at the leak point. The detector receives these signals using highly sensitive piezoelectric or capacitive ultrasonic sensors. Through multi-point detection, the signal strength increases closer to the leak point. Simultaneously, the thermal imager 17 operates during equipment movement. The thermal imager 17 converts the invisible infrared radiation emitted by an object into a visible thermal image, enabling non-contact, rapid screening and location based on temperature differences. For example, a leak of hot oil in an oil cylinder will show a clear difference in the thermal image. Through the cooperation of these two instruments… Simultaneously, the equipment moves back and forth on the outer surface of the cylinder. During the movement, the angle of the equipment is adjusted by the electric universal wheels 7, thereby recording thermal images of both sides of the entire cylinder. With this setup, the cylinder can be comprehensively inspected for flaws and leaks without disassembling it. The equipment can also crawl on the surface of the cylinder and transmit the inspection information to the terminal wirelessly in real time, greatly reducing the difficulty and danger of manual operation. It can also perform a comprehensive inspection of cylinders that are large or located in difficult positions. Many hydroelectric power station cylinders are installed far from the ground, making it difficult for operators to attach the equipment to the cylinder. In this case, a detachable suction cup 6 allows the operator to use an auxiliary telescopic rod 2. The end of the auxiliary telescopic rod 2 is fixed to the suction cup 6. Using the longer auxiliary telescopic rod 2, the detached suction cup 6 is attached to the cylinder surface using negative pressure. Then, the suction cup 6 pulls back the entire central liner 3, bringing the central liner 3 and the entire equipment into contact with the cylinder. During equipment movement, the auxiliary telescopic rod 2 can assist in lifting the equipment and aiding in the pull-back process. This design allows for regular maintenance of cylinders in hard-to-reach locations, ensuring the cylinder's operational safety.

[0031] After the fixed suction cup 6 is fixed, the electric roller in the winding device 9 slowly winds the cable 21, continuously pulling the center liner 3 to the surface of the cylinder. After the center liner 3 has moved, the state of the center liner 3 is gradually adjusted by the electric caster 7 to ensure the clamping stability of the side liner 1 4 and side liner 2 5 during the closing process.

[0032] Once the inspection ring 1 is fixed, the fixing suction cup 6 is released, and at the same time, the steel cable 21 continues to roll back, fixing the fixing suction cup 6 into the adapter groove 13, allowing the inspection ring 1 to move normally; the connecting valve 14 and the magnetic block 11 are magnetically paired to ensure the stability of the connection.

[0033] When connecting the fixed suction cup 6, the connecting arm 25 is fixed by the adsorption block 24 and the magnetic block 11. At the same time, the two elastic connecting arms 25 open to clamp the bottom of the fixed suction cup 6 and magnetically fix it at the same time to ensure a firm clamping effect on the fixed suction cup 6. Meanwhile, the universal shaft 23 can rotate at multiple angles so that the end of the fixed suction cup 6 can be perpendicular to the oil cylinder to ensure a firm adsorption and fixation process. The auxiliary telescopic rod 2 can be electric or pneumatic to complete the function of automatic control of telescopic extension.

[0034] The electromagnet module can control the magnetic force of the adsorption block 24 by energizing it, facilitating the adsorption and release process of the fixed suction cup 6. When the inspection ring 1 needs to be removed, the ejection structure in the adapter slot 13 can be used to push the fixed suction cup 6 outward, while releasing the steel cable 21 to let the fixed suction cup 6 fall outward. At this time, the auxiliary telescopic rod 2 can be used to fix the fixed suction cup 6. First, pull the fixed suction cup 6 back and fix it randomly on the nearby ground, and then guide the inspection ring 1 to return to its position. Similarly, the auxiliary telescopic rod 2 can also be used for support, and can directly grasp the part of the expansion ring 12 or other parts. The expansion ring 12 can be made of a high magnetic attraction material to improve the adsorption force.

[0035] The translation of the ultrasonic leak detector 16 can be controlled by the electric telescopic sleeve 15, ensuring that the probe of the instrument can fit against the surface of the oil cylinder, thereby adapting to different clamping states and ensuring smooth operation of the instrument probe. In order to improve the shooting effect of the thermal imager 17, the distance between the thermal imager 17 and the oil cylinder can be adjusted by the electric slide rail 18, thereby controlling the image captured during shooting; further ensuring the comprehensive detection effect of the oil cylinder.

[0036] To accommodate cylinders of different diameters, after the inspection ring 1 is fixed, the electric universal wheel 7 can be pushed outward by the electric telescopic rod 8. At the same time, under the reaction force of the spring, the electric universal wheel 7 is guaranteed to have a strong transmission connection with the cylinder.

[0037] Since the outer side of the oil cylinder is basically an outward convex arc, in order to ensure the adsorption effect of the fixed suction cup 6, the end of the fixed suction cup 6 is made of elastic material. After contacting the outer side of the oil cylinder, it can be deformed into the same arc shape as the oil cylinder. Since the end is made of elastic material, it will deform itself under negative pressure adsorption, increasing the negative pressure adsorption effect. At the same time, the connection end is equipped with a pressure relief valve to release pressure when the adsorption is released.

[0038] By concentrating the negative pressure hole 19 in the center and using the covering layer 20 to diffuse the suction, the fixed suction cup 6 can still be attached to the outside of the oil cylinder as a whole. This can improve the central suction and prevent the loss of negative pressure due to the surrounding lifting.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for overhauling hydraulic cylinders of hydroelectric power station gates based on ultrasound, characterized in that: The device includes a maintenance ring, which is arranged in a notched ring shape. The maintenance ring consists of a central liner, a first side liner, and a second side liner. Both ends of the central liner are fixedly connected to a reduction motor, and the output end of the reduction motor is fixedly connected to a transmission arm. The two transmission arms are respectively fixedly connected to the ends of the first and second side liners. An ultrasonic leak detector is installed in the middle of the first side liner, and a thermal imager is installed on the outer side of the second side liner. The inner ring of the maintenance ring is equipped with multiple electric casters. The middle of the first side liner is fixed with an electric telescopic sleeve facing the inner ring. The moving end of the electric telescopic sleeve is connected to an ultrasonic leak detector. Both the upper and lower ends of the second side liner are fixed with electric slide rails. The electric slide rails are inclined and the moving end of the electric slide rails is fixed to a thermal imager. The inspection ring has a built-in wireless communication module and a rechargeable power supply, both of which are electrically connected to the ultrasonic leak detector and the thermal imager. The center liner, side liner one, and side liner two are each provided with multiple moving slots in their middle parts. An electric telescopic rod is installed in each moving slot, and the end of the electric telescopic rod is fixedly connected to an electric omnidirectional wheel. The electric telescopic rod is slidably engaged with the moving groove, and a spring is fixedly connected to the outer side of the electric telescopic rod and the wall of the moving groove. The inspection ring is arranged in a three-quarters circular shape to secure the outer side of the hydraulic cylinder. When the cylinder diameter is small, as the first and second side liner plates continue to retract inward, a smaller clamping area is formed between the three liner plates, thus accommodating hydraulic cylinders of various diameters. The electric omnidirectional wheel can be remotely controlled to turn or rotate after the inspection ring is in contact with the outer side of the hydraulic cylinder, thereby driving the entire inspection ring to crawl along the outer side of the hydraulic cylinder. The ultrasonic leak detector captures high-frequency ultrasonic waves by having its probe in contact with the surface of the hydraulic cylinder and converts them into audible or visual signals. It locates leaks by using multi-point detection, based on the principle that the signal strength is stronger closer to the leak point. The thermal imager works simultaneously, converting the invisible infrared radiation emitted by the hydraulic cylinder into visible thermal images, and screening and locating leaks based on temperature differences. The electric telescopic sleeve is used to control the translation of the ultrasonic leak detector to ensure that its probe is in contact with the surface of the hydraulic cylinder and to adapt to different clamping states. The electric slide rail is used to adjust the distance between the thermal imager and the hydraulic cylinder to control the image captured during shooting.

2. The ultrasonic-based gate cylinder maintenance device for hydropower stations according to claim 1, characterized in that: The central liner is equipped with a fixed suction cup that can be merged and split. The fixed suction cup has a built-in negative pressure module and also includes an auxiliary telescopic rod to assist the fixed suction cup in moving.

3. The ultrasonic-based gate cylinder maintenance device for hydropower stations according to claim 2, characterized in that: A winding device is fixedly connected to the outer side of the center liner plate. The winding device has an electric roller that can rotate inside. A steel cable is wound around the outer side of the electric roller. The steel cable is fixedly connected to the bottom of the fixed suction cup.

4. The ultrasonic-based gate cylinder maintenance device for hydropower stations according to claim 3, characterized in that: The inner ring of the central liner has a recessed adapter groove, the bottom surface of the fixed suction cup is fixed with a magnetic block, and multiple connecting valves are installed in the adapter groove.

5. The ultrasonic-based gate cylinder maintenance device for hydropower stations according to claim 4, characterized in that: The bottom of the auxiliary telescopic rod is fixedly connected to a handle, and the end of the auxiliary telescopic rod is equipped with a universal shaft. Two elastic connecting arms are fixedly connected to the outside of the universal shaft, and an adsorption block is fixedly connected to the end of the connecting arms.

6. The ultrasonic-based gate cylinder maintenance device for hydropower stations according to claim 5, characterized in that: An expansion ring is fixed to the outside of the winding device, an electromagnet module is built into the adsorption block, a round rod is fixed between the fixed suction cup and the steel cable, and an ejection structure is installed in the adapter groove.

7. The ultrasonic-based gate cylinder maintenance device for hydropower stations according to claim 2, characterized in that: The fixed suction cup is divided into an absorption end and a connecting end. The connecting end is made of solid material and is connected to a steel cable. The absorption end is made of elastic material, and the outer surface of the absorption end is covered with suction holes.

8. The ultrasonic-based gate cylinder maintenance device for hydropower stations according to claim 7, characterized in that: The fixed suction cup has a negative pressure hole in the center of its top surface, and the outer side of the fixed suction cup is covered with a covering layer, the outer surface of which has multiple suction holes.

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