Low pressure regulating valve automatic positioning overhauling device

Abstract

This invention relates to the technical field of maintenance devices, and particularly to an automatic positioning maintenance device for low-pressure regulating valves. It features remote operation, can be applied to various hazardous and harsh maintenance environments, and boasts high reliability and practicality. The device includes a pole and a mobile chassis, with the mobile chassis mounted at the lower end of the pole. It also includes a lifter, a clamp, a rotating shaft, a drive rod, an operating rod, a transmission assembly, and a maintenance mechanism. The lifter has two drive wheels, one above the other, with drive belts fitted onto them. The clamp is mounted on the drive belt on one side of the pole and is used to load the maintenance mechanism, which is used for maintaining the low-pressure regulating valve. A transmission assembly is installed between one end of the drive rod and the rotating shaft below, driving the drive wheels. Multiple drive rods are sequentially extended end-to-end, and the operating rod is connected to the other end of the last drive rod via a transmission connection. The operating rod is equipped with a handwheel.

Description

Technical Field

[0001] This invention relates to the technical field of maintenance devices, and in particular to an automatic positioning maintenance device for low-pressure regulating valves. Background Technology

[0002] Low-pressure regulating valves are control devices used to regulate flow and pressure, and are widely used in pipelines transporting various media, especially in power systems for transporting media such as gas, steam, and cooling water. These low-pressure regulating valves require regular maintenance and emergency repairs in case of malfunction. Regular maintenance includes checking for leaks and verifying the reliability of the positioner. Emergency repairs vary, with common procedures including urgently supplying compressed air or connecting an external power source to the valve.

[0003] However, the installation environments of many low-pressure regulating valves in power systems vary widely. Some environments are dangerous, some are narrow and inconvenient for personnel to enter, some are installed at high positions and are inconvenient for maintenance, and some environments are radioactive, such as nuclear power plants, where radioactivity can damage electronic equipment. To maintain low-pressure regulating valves in these working environments, maintenance devices with automatic positioning functions are required, and remote operation by personnel is necessary, while minimizing the use of electronic equipment is also required. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides an automatic positioning and maintenance device for low-pressure regulating valves with remote operation function, which can be applied to a variety of dangerous and harsh maintenance environments, has high reliability and good practicality.

[0005] The present invention relates to an automatic positioning and maintenance device for a low-pressure regulating valve, comprising a vertical pole and a movable chassis, the movable chassis being mounted at the lower end of the vertical pole; it also includes a lifter, a clamp, a rotating shaft, a drive rod, an operating rod, a transmission assembly, and a maintenance mechanism. The lifter is provided with two drive wheels, one above the other, which are rotatably mounted on the lower and upper ends of the vertical pole respectively via the rotating shaft. A drive belt is fitted onto the two drive wheels. The clamp is mounted on the drive belt on one side of the vertical pole and is used to load the maintenance mechanism, which is used to maintain the low-pressure regulating valve. A transmission assembly is provided between one end of the drive rod and the rotating shaft located below, the rotating assembly driving the drive wheels to rotate. Multiple drive rods are sequentially inserted and extended end to end, and the operating rod is inserted and connected to the other end of the last drive rod. A handwheel is provided on the operating rod. The device is configured to adjust the low-pressure valve. The safe maintenance distance for the valve is achieved by sequentially extending multiple drive rods end-to-end. A suitable maintenance mechanism is mounted on the clamp, allowing the upright to be pushed from a safe distance via multiple drive rods and operating rods. Driven by the moving chassis, the upright approaches and positions itself near the pipeline where the low-pressure regulating valve is installed. Rotating the handwheel of the operating rod causes the operating rod and multiple drive rods to rotate. The drive rods, through a transmission assembly, drive a rotating shaft, which in turn drives the drive wheel of the lifting device. The drive wheel drives a drive belt, which in turn raises or lowers the clamp, bringing the maintenance mechanism into contact with the low-pressure regulating valve for automatic maintenance. This system features remote operation, a purely mechanical structure without electronic equipment, a compact size, and can be applied to various hazardous and harsh maintenance environments. It boasts high reliability and practicality.

[0006] Preferably, the transmission assembly includes a worm gear, a worm, and a bearing. The worm gear is concentrically mounted on a lower rotating shaft, and the worm is concentrically mounted on one end of the drive rod. The worm and worm gear mesh for transmission. The inner ring of the bearing is fitted onto the rotating shaft, and the outer ring of the bearing is provided with a bearing bracket. One end of the drive rod is rotatably connected to the bearing bracket via the bearing. The rotatable connection of the drive rod, worm, and bearing allows the operating rod and worm to rotate around the rotating shaft, thereby changing the pitch angle of the drive rod. This facilitates the movement of the upright and the chassis via the drive rod and operating rod, and ensures that the worm and worm gear remain meshed. Rotating the handwheel of the operating rod drives the drive rod and worm to rotate, which in turn drives the worm gear to rotate. The worm gear, through the rotating shaft, drives the drive wheel of the lower lifting device to rotate, thereby driving the drive belt to rotate. The structure is simple and practical.

[0007] Preferably, it also includes a counterweight, which is installed on the drive belt of the lifting device on one side of the pole. The counterweight and the clamp are located on both sides of the pole, respectively. The weight of the counterweight counterbalances the clamp and the maintenance mechanism, making it easier to operate by rotating the operating lever and multiple drive levers.

[0008] Preferably, the mobile chassis includes two fixed wheels, a wheel frame, and swivel wheels. The two fixed wheels are rotatably mounted on the left and right sides of the lower end of the upright via axles, and the swivel wheels are mounted on the rear side of the lower end of the upright via wheel frames. The two fixed wheels and the swivel wheels support the upright, and the swivel wheels are used for steering. The structure is simple and convenient for operation and movement.

[0009] Preferably, the clamp includes a U-shaped block, a screw rod, and a grating ruler. The U-shaped block is installed on one side of the drive belt of the lifter. A clamping slot is provided in the middle of the U-shaped block. The middle part of the screw rod is rotatably screwed to the upper plate of the clamping slot of the U-shaped block. The lower end of the screw rod is rotatably connected to the clamping plate. The clamping plate is located in the clamping slot of the U-shaped block. The clamping plate presses the connecting frame of the maintenance mechanism into the clamping slot of the U-shaped block. The U-shaped block moves up and down with the drive belt of the lifter. Rotating the screw rod causes the screw rod to press the clamping plate into the clamping slot of the U-shaped block under the action of the thread. The structure is simple and the clamping is stable.

[0010] Preferably, the inspection mechanism includes a support plate, two screws, a pressure plate, a nut, a slide rod, a sliding sleeve, a slider, a grating ruler, and a contact frame. The two screws are vertically mounted at both ends of the support plate. One end of the support plate is loaded onto a clamp. One end of the pressure plate is rotatably connected to one of the screws via a bearing. The nut is rotatably screwed onto the screw and concentrically mounted on the inner ring of the bearing. The other end of the pressure plate is slotted to the other screw. The nut is rotatably screwed onto the screw and presses against the pressure plate. The slide rod is vertically mounted on the pressure plate. The sliding sleeve is slidably fitted onto the slide rod. A positioning bolt is provided between the sliding sleeve and the slide rod. A vertical testing platform is provided on one side of the sliding sleeve. The slider is vertically slidably mounted on the testing platform. A grating ruler's testing head is mounted on the slider. The grating ruler is mounted on the testing platform. A display electrically connected to the grating ruler is mounted on the pressure plate. One end of the contact frame is mounted on the slider. The contact frame is horizontally positioned. The other end of the contact frame is connected to a low-voltage... The positioning block of the pressure regulating valve positioner is movably connected. When testing the positioning accuracy of the low-pressure regulating valve positioner in a safe environment, push the upright rod and moving base to the side of the low-pressure regulating valve's pipeline. Turn the handwheel of the operating lever to raise the clamping device and raise the support plate, which rests against the pipeline of the low-pressure regulating valve. Two screws are located on opposite sides of the pipeline. Rotate the pressure plate so that its slot engages with the screw. Rotate the nut and nut to press the pressure plate and support plate firmly against the pipeline. Adjust and lock the height of the grating ruler along the slide rod. Move the slider so that one end of the contact frame engages with the positioning block of the low-pressure regulating valve positioner. Operate the low-pressure regulating valve positioner to drive the positioning block and positioning screw to move. The positioning block drives the contact frame and slider to move. The slider's detection head, in conjunction with the grating ruler, detects the slider's displacement. The display shows the displacement value, thus verifying the displacement accuracy of the positioner's positioning block and also testing the positioning stability of the positioner's positioning block.

[0011] Preferably, it also includes a level, which is mounted on the sliding sleeve and set horizontally. The level is used to adjust the verticality of the sliding rod. The level facilitates the adjustment of the verticality of the sliding rod and the detection platform on the sliding sleeve, thereby improving the detection accuracy of the displacement of the positioning block.

[0012] Preferably, the maintenance mechanism includes an accumulator, a telescopic rod, multiple levers, and an unlocking lever. A connecting plate for clamping is provided on the outer wall of the accumulator. A worm spring is provided inside the accumulator; one end of the worm spring is connected to the output shaft of the accumulator, and the other end is connected to the inner wall of the accumulator. The output shaft of the accumulator is movably fitted with the telescopic rod. Multiple levers are provided at the lower end of the telescopic rod for actuating a valve wheel. A circular plate is provided on the telescopic rod. A locking assembly for the output shaft is provided on the end face of the accumulator. The locking assembly includes a ratchet, a limiting tooth, and an unlocking lever. The ratchet is concentrically mounted on the 25° output shaft and engages with the limiting tooth. The limiting tooth is installed on the upper end of the unlocking lever, and the lower end of the unlocking lever contacts the circular plate. The circular plate pushes the unlocking lever to unlock the output shaft of the accumulator. When needed... When an emergency shutdown of a low-pressure regulating valve in a hazardous environment is required, the accumulator is mounted on a clamp via a connecting plate. Rotating multiple levers tightens the worm spring, storing energy. From a safe distance, personnel remotely operate the upright and mobile chassis via an operating lever and multiple drive levers to move them to the pipeline next to the low-pressure regulating valve. Rotating the operating lever raises and lowers the accumulator, causing multiple levers to insert into the valve wheel of the low-pressure regulating valve. The accumulator continues to descend, causing the telescopic rod to retract into the accumulator's output shaft. A circular plate pushes the unlocking lever to unlock the locking assembly, releasing the stored energy from the worm spring and driving the accumulator's output shaft to rotate. The accumulator's output shaft, through the telescopic rod, drives multiple levers to actuate the valve wheel, thus shutting off the low-pressure regulating valve in an emergency. This method involves no electronic equipment, allows entry into radioactive environments, and offers high reliability.

[0013] Preferably, the maintenance mechanism includes a second clamp and a quick connector. The second clamp is mounted on a clamping device, and the quick connector is mounted on the second clamp. The input end of the quick connector is connected to a compressed air pipe. When the compressed air system of the low-pressure regulating valve in a hazardous environment fails, and emergency air supply to the low-pressure regulating valve is required, the compressed air pipe on the quick connector is connected to an emergency air supply device. The second clamp is then mounted on the clamping device. At a safe distance, the upright and the movable chassis are moved by the operating rod and multiple drive rods, allowing the quick connector to be quickly inserted into the emergency interface of the low-pressure regulating valve, thereby restoring the regulating function of the low-pressure regulating valve.

[0014] Compared with the prior art, the beneficial effects of this invention are as follows: Based on the safe maintenance distance of the low-pressure regulating valve, multiple drive rods are sequentially extended end to end, and a suitable maintenance mechanism is loaded onto the clamp. Thus, outside the safe distance, the upright is pushed by multiple drive rods and operating rods. Driven by the moving chassis, the upright approaches and positions itself near the pipeline where the low-pressure regulating valve is installed. Rotating the handwheel of the operating rod causes the operating rod and multiple drive rods to rotate. The drive rods drive the rotating shaft to rotate through the transmission assembly. The rotating shaft drives the drive wheel of the lifting device to rotate. The drive wheel drives the drive belt to rotate. The drive belt raises or lowers the clamp, thereby bringing the maintenance mechanism into contact with the low-pressure regulating valve and performing automatic maintenance on the low-pressure regulating valve. It has remote operation function, a purely mechanical structure, no electronic equipment, a small size, can be applied to a variety of dangerous and harsh maintenance environments, has high reliability, and good practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the working state of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the maintenance mechanism in Example 1; Figure 4 This is a schematic diagram of the working state of Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the maintenance mechanism in Example 2; Figure 6 This is a schematic diagram of the working state of Embodiment 3 of the present invention; The following components are labeled in the attached diagram: 1. Upright pole; 2. Movable chassis; 3. Lifter; 4. Clamp; 5. Rotating shaft; 6. Drive rod; 7. Operating rod; 8. Worm gear; 9. Worm; 10. Bearing 1; 11. Counterweight; 12. Fixed wheel; 13. Wheel frame; 14. Universal wheel; 15. Support plate; 16. Screw 1; 17. Pressure plate; 18. Nut 1; 19. Slide rod; 20. Sliding sleeve; 21. Slider; 22. Grating ruler; 23. Contact frame; 24. Level; 25. Accumulator; 26. Telescopic rod; 27. Toggle lever; 28. Unlocking lever; 29. ​​Clamping plate 2; 30. Quick connector; 31. U-block; 32. Screw 3; 33. Clamping plate. Detailed Implementation

[0016] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0017] Example 1

[0018] like Figure 1 As shown, the low-pressure regulating valve automatic positioning and maintenance device includes a vertical pole 1 and a movable chassis 2, with the movable chassis 2 installed at the lower end of the vertical pole 1. It also includes a lifting device 3, a clamp 4, a rotating shaft 5, a drive rod 6, an operating rod 7, a transmission assembly, and a maintenance mechanism. The lifting device 3 has two drive wheels, one above the other, which are rotatably mounted on the lower and upper ends of the vertical pole 1 via the rotating shaft 5. Drive belts are fitted onto the two drive wheels. The clamp 4 is installed on the drive belt on one side of the vertical pole 1 and is used for loading and maintenance. The maintenance mechanism is used to maintain the low-pressure regulating valve. A transmission assembly is installed between one end of the drive rod 6 and the lower rotating shaft 5. The rotating assembly drives the drive wheel to rotate. Multiple drive rods 6 are sequentially extended end-to-end. An operating rod 7 is inserted and connected to the other end of the last drive rod 6. A handwheel is provided on the operating rod 7. The transmission assembly includes a worm gear 8, a worm 9, and a bearing 10. The worm gear 8 is concentrically mounted on the lower rotating shaft 5, and the worm 9 is concentrically mounted on one end of the drive rod 6. The worm 9 meshes with the worm gear 8 for transmission. The inner ring of bearing 10 is fitted onto the rotating shaft 5, and the outer ring of bearing 10 is provided with a bearing bracket. One end of the drive rod 6 is rotatably connected to the bearing bracket via a bearing. It also includes a counterweight 11, which is mounted on the drive belt of the lifting device 3 on one side of the upright 1. The counterweight 11 and the clamp 4 are located on opposite sides of the upright 1. The movable chassis 2 includes two fixed wheels 12, a wheel frame 13, and a caster wheel 14. The two fixed wheels 12 are rotatably mounted on the left and right sides of the lower end of the upright 1 via axles. The caster wheel 14... The wheel frame 13 is installed on the lower rear side of the upright 1; the clamp 4 includes a U-shaped block 31, a screw 32 and a grating ruler 22. The U-shaped block 31 is installed on one side of the drive belt of the lifting device 3. A clamping slot is provided in the middle of the U-shaped block 31. The middle part of the screw 32 is rotatably screwed to the upper plate of the clamping slot of the U-shaped block 31. The lower end of the screw 32 is rotatably connected to the clamping plate 33. The clamping plate 33 is located in the clamping slot of the U-shaped block 31. The clamping plate 33 presses the connecting frame of the maintenance mechanism into the clamping slot of the U-shaped block 31.

[0019] Based on the safe maintenance distance of the low-pressure regulating valve, multiple drive rods 6 are sequentially extended end-to-end. The appropriate maintenance mechanism is then loaded into the clamping slot of the U-shaped block 31. Rotating the screw 32 causes the screw 32, under the action of its threads, to press the clamping plate 33 against the maintenance mechanism. Thus, outside the safe distance, the multiple drive rods 6 and operating rod 7 push the upright 1. Driven by the moving chassis 2, the upright 1 approaches and positions itself near the pipeline where the low-pressure regulating valve is installed. Rotating the handwheel of the operating rod 7 causes the operating rod 7, multiple drive rods 6, and worm gear 9 to rotate. The worm gear 9 meshes with and drives the worm wheel 8 to rotate. The worm wheel 8, through the rotating shaft 5, drives the drive wheel of the lower lifting device 3 to rotate, thereby driving the drive belt to rotate. The drive belt causes the clamping device 4 to rise or fall, thus bringing the maintenance mechanism into contact with the low-pressure regulating valve. This device enables automatic maintenance of low-pressure regulating valves, features remote operation, a purely mechanical structure without electronic equipment, and a compact size. It can be applied to various hazardous and harsh maintenance environments, offering high reliability and practicality. The rotating connection of the drive rod 6, worm gear 9, and bearing 10 allows the operating rod 7 and worm gear 9 to rotate around the shaft 5, thereby changing the pitch angle of the drive rod 6. This facilitates the movement of the upright 1 and the chassis 2 via the drive rod 6 and operating rod 7, while ensuring that the worm gear 9 and worm wheel 8 remain in mesh. The structure is simple and practical. The weight of the counterweight 11 provides counterweight to the clamp 4 and maintenance mechanism, making operation via the rotating operating rod 7 and multiple drive rods 6 more effortless. Two fixed wheels 12 and a universal wheel 14 support the upright 1, with the universal wheel 14 used for steering. The structure is simple and easy to operate.

[0020] Example 2

[0021] like Figure 2 and Figure 3As shown, the low-pressure regulating valve automatic positioning and maintenance device includes a vertical pole 1 and a movable chassis 2, with the movable chassis 2 installed at the lower end of the vertical pole 1. It also includes a lifting device 3, a clamp 4, a rotating shaft 5, a drive rod 6, an operating lever 7, a transmission assembly, and a maintenance mechanism. The lifting device 3 has two drive wheels, one above the other, which are rotatably mounted on the lower and upper ends of the vertical pole 1 via the rotating shaft 5. Drive belts are fitted onto the two drive wheels. The clamp 4 is installed on the drive belt on one side of the vertical pole 1 and is used to load the maintenance mechanism, which is used for maintenance. The low-pressure regulating valve has a transmission assembly between one end of the drive rod 6 and the rotating shaft 5 located below. The rotating assembly drives the drive wheel to rotate. Multiple drive rods 6 are sequentially extended end to end. The operating rod 7 is connected to the other end of the last drive rod 6 via a transmission connection. The operating rod 7 is equipped with a handwheel. The maintenance mechanism includes a support plate 15, two screws 16, a pressure plate 17, a nut 18, a slide rod 19, a sliding sleeve 20, a slider 21, a grating ruler 22, and a contact frame 23. The two screws 16 are vertically installed at both ends of the support plate 15. One end of the support plate 15 is loaded with... On the clamp 4, one end of the pressure plate 17 is rotatably connected to a screw 16 via a bearing. A nut 18 is rotatably screwed onto the screw 16 and is concentrically mounted on the inner ring of the bearing. The other end of the pressure plate 17 is snapped into another screw 16 via a slot. A nut is rotatably screwed onto the screw 16 and presses the pressure plate 17. A slide rod 19 is vertically mounted on the pressure plate 17, and a sliding sleeve 20 is slidably fitted onto the slide rod 19. A positioning bolt is provided between the sliding sleeve 20 and the slide rod 19. A vertical inspection bolt is provided on one side of the sliding sleeve 20. The measuring platform includes a slider 21 vertically slidably mounted on the aforementioned measuring platform. A measuring head of a grating ruler 22 is mounted on the slider 21, and the grating ruler 22 is mounted on the measuring platform. A display electrically connected to the grating ruler 22 is mounted on the pressure plate 17. One end of a contact frame 23 is mounted on the slider 21, and the contact frame 23 is horizontally positioned. The other end of the contact frame 23 is movably connected to the positioning block of the positioner of the low-pressure regulating valve. The platform also includes a level 24, which is mounted on a sliding sleeve 20 and is horizontally positioned. The level 24 is used to adjust the verticality of the sliding rod 19.

[0022] When testing the positioning accuracy of the positioner for a low-pressure regulating valve in a safe environment, push the upright rod 1 and the movable base 2 to move them next to the pipeline of the low-pressure regulating valve. Turn the handwheel of the operating lever 7 to raise the clamp 4 and lift the support plate 15. The support plate 15 rests against the pipeline of the low-pressure regulating valve. The two screws 16 are located on both sides of the pipeline. Turn the pressure plate 17 so that the slot of the pressure plate 17 is engaged with the screw 16. Turn the nut 18 and the nut to press the pressure plate 17 and the support plate 15 tightly against the pipeline. Adjust and lock the height of the grating ruler 22 along the slide rod 19. Move the slider 2. 1. One end of the contact frame 23 is engaged with the positioning block of the positioner of the low-pressure regulating valve. The positioner of the low-pressure regulating valve is operated to drive the positioning block and the positioning screw to move. The positioning block drives the contact frame 23 and the slider 21 to move. The detection head of the slider 21 cooperates with the grating ruler 22 to detect the displacement of the slider 21. The display shows the displacement value, thereby verifying the displacement accuracy of the positioning block of the positioner and also detecting the positioning stability of the positioning block of the positioner. The verticality of the detection platform on the slide rod 19 and the slide sleeve 20 can be easily adjusted by the level 24, thereby improving the detection accuracy of the displacement of the positioning block.

[0023] Example 3

[0024] like Figure 4 and Figure 5 As shown, the automatic positioning and maintenance device for a low-pressure regulating valve includes a vertical pole 1 and a movable chassis 2, with the movable chassis 2 installed at the lower end of the vertical pole 1. It also includes a lifting device 3, a clamp 4, a rotating shaft 5, a drive rod 6, an operating lever 7, a transmission assembly, and a maintenance mechanism. The lifting device 3 has two drive wheels, one above the other, which are rotatably mounted on the lower and upper ends of the vertical pole 1 via the rotating shaft 5. Drive belts are fitted onto the two drive wheels. The clamp 4 is mounted on the drive belt on one side of the vertical pole 1 and is used to mount the maintenance mechanism, which is used to maintain the low-pressure regulating valve. A transmission assembly is installed between one end of the drive rod 6 and the rotating shaft 5 located below. The rotating assembly drives the drive wheels to rotate. Multiple drive rods 6 are sequentially extended end-to-end. The operating lever 7 is connected to the other end of the last drive rod 6. The transmission is connected by a cartridge, and a handwheel is provided on the operating lever 7. The maintenance mechanism includes an accumulator 25, a telescopic rod 26, multiple levers 27, and an unlocking lever 28. A connecting plate for clamping is provided on the outer wall of the accumulator 25. A worm spring is provided inside the accumulator 25. One end of the worm spring is connected to the output shaft of the accumulator 25, and the other end of the worm spring is connected to the inner wall of the accumulator 25. The output shaft of the accumulator 25 is movably fitted with the telescopic rod 26. Multiple levers 27 are provided at the lower end of the telescopic rod 26. The multiple levers 27 are used to actuate the valve wheel. A circular plate is provided on the telescopic rod 26. A locking assembly for the output shaft is provided on the end face of the accumulator 25. The locking assembly is provided with an unlocking lever 28. The lower end of the unlocking lever 28 contacts the circular plate. The circular plate pushes the unlocking lever 28 to unlock the output shaft of the accumulator 25.

[0025] When an emergency shutdown of a low-pressure regulating valve in a hazardous environment is required, the accumulator 25 is mounted on the clamp 4 via a connecting plate. Rotating multiple levers 27 tightens the worm spring, storing energy. From a safe distance, personnel remotely operate the upright 1 and mobile chassis 2 via the operating lever 7 and multiple drive levers 6 to move them to the pipeline next to the low-pressure regulating valve. Rotating the operating lever 7 raises and lowers the accumulator 25, causing the multiple levers 27 to insert into the valve wheel of the low-pressure regulating valve. The accumulator 25 continues to descend, causing the telescopic rod 26 to retract into the output shaft of the accumulator 25. The circular plate pushes the unlocking lever 28 to unlock the locking assembly, releasing the stored energy from the worm spring and driving the output shaft of the accumulator 25 to rotate. The output shaft of the accumulator 25, through the telescopic rod 26, drives the multiple levers 27 to actuate the valve wheel, thus shutting off the low-pressure regulating valve in an emergency. This method involves no electronic equipment, allows entry into radioactive environments, and offers high reliability.

[0026] Example 4

[0027] like Figure 6 As shown, the low-pressure regulating valve automatic positioning and maintenance device includes a vertical pole 1 and a movable chassis 2, with the movable chassis 2 installed at the lower end of the vertical pole 1. It also includes a lifting device 3, a clamp 4, a rotating shaft 5, a drive rod 6, an operating lever 7, a transmission assembly, and a maintenance mechanism. The lifting device 3 has two drive wheels, one above the other, which are rotatably mounted on the lower and upper ends of the vertical pole 1 via the rotating shaft 5. Drive belts are fitted onto the two drive wheels. The clamp 4 is installed on the drive belt on one side of the vertical pole 1 and is used to load the maintenance machine. The maintenance mechanism is used to maintain the low-pressure regulating valve. A transmission assembly is set between one end of the drive rod 6 and the rotating shaft 5 located below. The rotating assembly drives the drive wheel to rotate. Multiple drive rods 6 are inserted and extended one after the other in sequence. The operating rod 7 is inserted and connected to the other end of the last drive rod 6. A handwheel is set on the operating rod 7. The maintenance mechanism includes a clamping plate 29 and a quick connector 30. The clamping plate 29 is clamped onto the clamp 4. The quick connector 30 is installed on the clamping plate 29. The input end of the quick connector 30 is connected to a compressed air pipe.

[0028] When the compressed air system of the low-pressure regulating valve in a hazardous environment fails, and an emergency air supply is required to the low-pressure regulating valve, the compressed air pipe on the quick connector 30 is connected to the emergency air supply equipment. The clamp plate 29 is clamped onto the clamp 4. At a safe distance, the upright 1 and the movable chassis 2 are moved by the operating rod 7 and multiple drive rods 6, so that the quick connector 30 can be quickly inserted into the emergency interface of the low-pressure regulating valve, thereby realizing the emergency air supply to the low-pressure regulating valve and restoring the regulating function of the low-pressure regulating valve.

[0029] like Figures 1 to 6As shown, the automatic positioning and maintenance device for low-pressure regulating valves of the present invention, during operation, firstly, according to the safe maintenance distance of the low-pressure regulating valve, extends multiple drive rods 6 one after the other, and loads the appropriate maintenance mechanism into the clamping slot of the U-shaped block 31. Rotating the screw 32 causes the clamping plate 33 to lock the clamping mechanism. Then, outside the safe distance, the multiple drive rods 6 and the operating rod 7 push the upright 1. Supported by the rolling of the fixed wheel 12 and the universal wheel 14, the upright 1 approaches and positions itself near the pipeline where the low-pressure regulating valve is installed. Then, the operating rod 7 is rotated... The handwheel of lever 7 causes lever 7 and multiple drive levers 6 to rotate. Drive lever 6 drives shaft 5 to rotate through the meshing of worm gear 9 and worm wheel 8. Shaft 5 drives drive wheel of lift 3 to rotate. Drive wheel drives drive belt to rotate. Drive belt drives clamp 4 to rise or fall, thereby driving maintenance mechanism to contact low-pressure regulating valve. Finally, it automatically checks the displacement accuracy of positioning block of positioner, detects positioning stability of positioning block of positioner, and restores the regulating function of low-pressure regulating valve by emergency closing of low-pressure regulating valve or emergency air supply to low-pressure regulating valve.

[0030] The main functions achieved by this invention are: It has remote operation capabilities, can be applied to a variety of dangerous and harsh maintenance environments, and is highly reliable and practical. It has multiple maintenance mechanisms, suitable for different maintenance tasks; It can be used to repair low-pressure regulating valves at different heights, and has good versatility.

[0031] The automatic positioning and maintenance device for low-pressure regulating valves of the present invention can be installed, connected, or set in a common mechanical manner, and any method that can achieve its beneficial effects can be implemented. The mobile chassis 2, lifting device 3, worm gear 8, worm 9, bearing 10, fixed wheel 12, caster wheel 14, screw 16, nut 18, grating ruler 22, display, worm spring, quick connector 30, and screw 32 of the automatic positioning and maintenance device for low-pressure regulating valves of the present invention are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0032] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automatic positioning and maintenance device for a low-pressure regulating valve, comprising a vertical pole (1) and a movable chassis (2), wherein the movable chassis (2) is installed at the lower end of the vertical pole (1); characterized in that, It also includes a lifter (3), a clamp (4), a rotating shaft (5), a drive rod (6), an operating rod (7), a transmission assembly, and a maintenance mechanism. The lifter (3) is equipped with two drive wheels, one above the other. The two drive wheels of the lifter (3) are rotatably mounted on the lower and upper parts of the pole (1) respectively via the rotating shaft (5). A drive belt is fitted on the two drive wheels. The clamp (4) is mounted on the drive belt on one side of the pole (1). The clamp (4) is used to load the maintenance mechanism. The maintenance mechanism is used to maintain the low-pressure regulating valve. A transmission assembly is set between one end of the drive rod (6) and the rotating shaft (5) located below. The rotating assembly drives the drive wheel to rotate. Multiple drive rods (6) are inserted and extended one end to the other in sequence. The operating rod (7) is inserted and connected to the other end of the last drive rod (6). A handwheel is set on the operating rod (7).

2. The automatic positioning and maintenance device for low-pressure regulating valves as described in claim 1, characterized in that, The transmission assembly includes a worm gear (8), a worm (9), and a bearing (10). The worm gear (8) is concentrically mounted on the rotating shaft (5) located below. The worm (9) is concentrically mounted on one end of the drive rod (6). The worm (9) meshes with the worm gear (8) for transmission. The inner ring of the bearing (10) is fitted on the rotating shaft (5). The outer ring of the bearing (10) is provided with a bearing bracket. One end of the drive rod (6) is rotatably connected to the bearing bracket through the bearing.

3. The automatic positioning and maintenance device for low-pressure regulating valves as described in claim 1, characterized in that, It also includes a counterweight (11), which is installed on the drive belt of the lifter (3) on one side of the pole (1). The counterweight (11) and the clamp (4) are located on both sides of the pole (1).

4. The automatic positioning and maintenance device for low-pressure regulating valves as described in claim 1, characterized in that, The mobile chassis (2) includes two fixed wheels (12), a wheel frame (13) and a swivel wheel (14). The two fixed wheels (12) are rotatably mounted on the left and right sides of the lower end of the upright (1) via axles, and the swivel wheel (14) is mounted on the rear side of the lower end of the upright (1) via the wheel frame (13).

5. The automatic positioning and maintenance device for low-pressure regulating valves as described in claim 1, characterized in that, The clamp (4) includes a U-shaped block (31), a screw (32) and a grating ruler (22). The U-shaped block (31) is installed on one side of the drive belt of the lifting device (3). A clamping slot is provided in the middle of the U-shaped block (31). The middle part of the screw (32) is rotatably screwed to the upper plate of the clamping slot of the U-shaped block (31). The lower end of the screw (32) is rotatably connected to the clamping plate (33). The clamping plate (33) is located in the clamping slot of the U-shaped block (31). The clamping plate (33) presses the connecting frame of the maintenance mechanism into the clamping slot of the U-shaped block (31).

6. The automatic positioning and maintenance device for low-pressure regulating valves as described in claim 1, characterized in that, The maintenance mechanism includes a support plate (15), two screws (16), a pressure plate (17), a nut (18), a slide rod (19), a sliding sleeve (20), a slider (21), a grating ruler (22), and a contact frame (23). The two screws (16) are vertically installed at both ends of the support plate (15). One end of the support plate (15) is loaded onto the clamp (4). One end of the pressure plate (17) is rotatably connected to one of the screws (16) through a bearing. The nut (18) is rotatably screwed onto the screw (16). The nut (18) is concentrically installed on the inner ring of the bearing. The other end of the pressure plate (17) is clamped to the other screw (16) through a slot. The nut is rotatably screwed onto the screw (16). The pressure plate (17) is pressed down on the pressure plate (17), the slide rod (19) is vertically installed on the pressure plate (17), the slide sleeve (20) is slidably fitted on the slide rod (19), a positioning bolt is provided between the slide sleeve (20) and the slide rod (19), a vertical detection platform is provided on one side of the slide sleeve (20), the slider (21) is vertically slidably installed on the above detection platform, the detection head of the grating ruler (22) is installed on the slider (21), the grating ruler (22) is installed on the detection platform, the display that is electrically connected to the grating ruler (22) is installed on the pressure plate (17), one end of the contact frame (23) is installed on the slider (21), the contact frame (23) is horizontally set, and the other end of the contact frame (23) is movably connected to the positioning block of the positioner of the low pressure regulating valve.

7. The automatic positioning and maintenance device for low-pressure regulating valves as described in claim 6, characterized in that, It also includes a level (24), which is mounted on the sliding sleeve (20). The level (24) is set horizontally and is used to adjust the verticality of the sliding rod (19).

8. The automatic positioning and maintenance device for low-pressure regulating valves as described in claim 1, characterized in that, The maintenance mechanism includes an accumulator (25), a telescopic rod (26), multiple levers (27), and an unlocking lever (28). The outer wall of the accumulator (25) is provided with a connecting plate for clamping. The accumulator (25) is provided with a worm spring inside. One end of the worm spring is connected to the output shaft of the accumulator (25), and the other end of the worm spring is connected to the inner wall of the accumulator (25). The output shaft of the accumulator (25) is movably fitted with the telescopic rod (26). Multiple levers (27) are provided at the lower end of the telescopic rod (26). The multiple levers (27) are used to move the valve wheel. A circular plate is provided on the telescopic rod (26). A locking assembly for the output shaft is provided on the end face of the accumulator (25). The locking assembly is provided with an unlocking lever (28). The lower end of the unlocking lever (28) contacts the circular plate. The circular plate pushes the unlocking lever (28) to unlock the output shaft of the accumulator (25).

9. The automatic positioning and maintenance device for low-pressure regulating valves as described in claim 1, characterized in that, The maintenance mechanism includes a clamping plate (29) and a quick connector (30). The clamping plate (29) is clamped onto the clamp (4), and the quick connector (30) is mounted on the clamping plate (29). The input end of the quick connector (30) is connected to a compressed air pipe.

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