Natural Gas Long-distance Pipeline Valve Detection and Diagnosis Device

Abstract

The present invention relates to the technical field of valve detection, and particularly to a detection and diagnosis device for valves in long-distance natural gas pipelines. It includes a frame body, a middle plate is slidably arranged in the horizontal direction within the frame body, both the left and right ends of the middle plate are rotatably connected to side plates, a driving device for driving the middle plate and the side plates to move in the horizontal direction is arranged on the frame body, the side plates are parallel to the middle plate, and rotary supports are arranged on the frame body below the side plates. After the valve is centered by the centering device in the present invention, the detection head can effectively seal the upper end of the valve. After the valve is centered, the detection head can directly move downward and press the upper end of the valve, simplifying the process of detecting and diagnosing the valve, improving the efficiency of valve detection and diagnosis. The present invention can detect and diagnose valves of different sizes, and has a wide range of applications.

Description

Technical Field

[0001] The present invention relates to the technical field of valve detection, and particularly to a detection and diagnosis device for valves in long-distance natural gas pipelines. Background Art

[0002] A valve is a pipeline accessory used to open and close pipelines, control the flow direction, and adjust and control parameters (temperature, pressure, and flow rate) of the transported medium. In long-distance natural gas pipelines, valves of different sizes need to be selected according to the diameter of the pipeline. To ensure that the valve can work properly after installation, it is necessary to detect and diagnose the sealing performance of the valve before installing the valve, so as to eliminate unqualified valves.

[0003] During the process of valve diagnosis and detection, one side of the valve needs to be sealed and pressurized, and the change in pressure is observed within a set time. If the pressure drops, it indicates that there is a leak at the sealing part of the valve; otherwise, the sealing performance of the valve is good. In order to adapt to the detection and diagnosis of valves of different sizes, the lower cylinder for placing the valve in some existing detection and diagnosis devices is generally set to be relatively large. When a valve with a smaller diameter is placed in the lower cylinder, the valve needs to be aligned using an alignment device to ensure that the upper cylinder can effectively seal the upper end of the valve and then apply high-pressure water for detection and diagnosis. After the valve is aligned with the upper cylinder, the upper cylinder is first tightened on the valve, then the alignment device releases the valve, and then the upper cylinder is hermetically connected to the valve for pressurized detection and diagnosis. Such a detection and diagnosis method has complex procedures. The alignment device needs to align the valve first and then release the valve, which increases the detection time of the valve and results in low detection and diagnosis efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is a detection and diagnosis device for valves in long-distance natural gas pipelines that simplifies the procedures of valve detection and diagnosis, can improve the detection efficiency of valves, is convenient for loading and unloading valves, reduces the labor intensity of workers, and can recycle the water used for detecting and diagnosing valves.

[0005] To achieve the above object, the technical solution provided by the present invention is:

[0006] The valve detection and diagnosis device for long-distance natural gas pipelines includes a frame body. It is characterized in that an intermediate plate is slidably arranged in the horizontal direction within the frame body. Both the left and right ends of the intermediate plate are rotatably connected to side plates. A driving device is arranged on the frame body for driving the intermediate plate and the side plates to move in the horizontal direction. The side plates are parallel to the intermediate plate. Rotary supports are arranged on the frame body below the side plates. The rotary supports are used to support the lower ends of the side plates on one side. Slot holes are formed on the side plates. Positioning members for supporting the valve are arranged on the side plates on both sides of the slot holes. A centering device is arranged inside the lower end of the frame body. A detection head for sealing the upper end of the valve and injecting high-pressure water into the valve is arranged within the frame body above the centering device. The centering device includes a fixed pipe. When the intermediate plate is located above the fixed pipe, the lower end surface of the intermediate plate contacts the upper end of the fixed pipe. When the side plate is located above the fixed pipe, the lower end surface of the side plate contacts the upper end of the fixed pipe. A lifting ring is slidably arranged within the fixed pipe. The lifting ring is driven by a lower telescopic cylinder within the fixed pipe. The lower end of the lower telescopic cylinder is elastically connected to the frame body. A conical surface is formed on the outer side of the upper end of the lifting ring. An upper pipe concentric with it is fixed inside the upper end of the lifting ring. A plurality of centering rods are evenly arranged in a circular pattern on the upper end circumference of the upper pipe. The centering rods are rotatably connected to the upper pipe. One end of the centering rod facing the axis of the upper pipe is connected to an upper plate fixed on the cylinder body of the lower telescopic cylinder through a pull rope. During the process of the lower telescopic cylinder driving the lifting ring to move upward, under the pulling force of the pull rope, the centering rods tend to be parallel to the horizontal plane and straighten the valve.

[0007] Specifically, the frame body includes a bottom plate and a top plate. The four corners of the bottom plate and the top plate are fixedly connected through columns. Water tanks are fixedly arranged on both the left and right sides of the bottom plate. The upper ends of the water tanks are open. A grid plate is fixed inside the upper openings of the water tanks. Guide members are arranged on the front two columns and the rear two columns. The two guide members are arranged oppositely. The guide member includes two horizontally arranged slide rails arranged up and down. The intermediate plate and the side plates are slidably arranged between the upper and lower slide rails. Limit blocks are fixedly arranged at the upper ends of the side plates. When the limit blocks contact the ends of the slide rails, the slot hole on one side of the limit block in contact with the end of the slide rail is concentric with the fixed pipe and the detection head.

[0008] Specifically, the rotary support includes a connecting rod fixed inside the frame body. An ear seat is fixed on the connecting rod. A bracket is rotatably connected inside the ear seat through a rotating rod. The bracket includes a vertical portion and a straight portion. A first universal ball is installed at the upper end of the vertical portion of the bracket. The first universal ball is in rolling contact with the lower end of the side plate on one side. The rotating rod is fixedly connected to the bracket and rotatably connected to the ear seat. A worm gear is fixed on the rotating rod. A motor is fixed on the connecting rod. A worm is fixed on the output shaft of the motor. The worm meshes with the worm gear.

[0009] Specifically, the lower end of the fixed tube is fixedly connected to the bottom plate, the upper plate is slidably arranged in the fixed tube, the lower end of the lower telescopic cylinder is fixed with a lower plate, the lower end of the lower plate is fixed with a rubber pad, the rubber pad is fixedly connected to the lower end of the frame, a vertical groove corresponding to the righting rod is opened at the upper end of the upper tube, the righting rod is rotatably arranged in the vertical groove by a pin rod, a block for blocking the righting rod is fixed in the vertical groove on the inner side of the pin rod, the righting rod includes a positioning rod, the positioning rod is rotatably arranged in the vertical groove by the pin rod, a screw rod concentric with the positioning rod is threadedly connected to the positioning rod, one end of the screw rod extends to the outside of the positioning rod, a head is fixed to one end of the screw rod outside the positioning rod, and a second universal ball is installed on the head.

[0010] Specifically, the positioning member includes a vertical branch pipe fixed on the side plate, the branch pipe is a square pipe, a lifting rod is slidably inserted in the branch pipe, the lifting rod is a square rod, and a locking handle for locking the branch rod in the branch pipe is threaded on the branch pipe, a supporting rod perpendicular to the lifting rod is fixed to the upper end of the lifting rod, and a vertical plug rod is fixed on the upper side of one end of the supporting rod away from the lifting rod, and the plug rod is used to be inserted into the hole on the upper flange at the upper end of the valve to support and stabilize the valve.

[0011] Specifically, the detection head includes an upper telescopic cylinder fixed at the upper end of the frame, a pressure cover is fixed on the telescopic rod of the upper telescopic cylinder, an inlet pipe connected to the interior of the pressure cover is fixed on the pressure cover, a pressure sensor is fixed at the upper end of the pressure cover, the sensing head of the pressure sensor is located in the inner cavity of the pressure cover, and a sealing ring is fixed at the lower end of the pressure cover.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. After the centering device is used to center the valve, the detection head can effectively seal the upper end of the valve. After the valve is centered, the detection head can be directly moved downward and squeeze the upper end of the valve, which simplifies the process of detecting and diagnosing the valve and improves the efficiency of valve detection and diagnosis.

[0014] 2. The present invention can detect and diagnose valves of different sizes and has a wide range of applications.

[0015] 3. During the detection and diagnosis of one valve, the other valve can be supported and stabilized by the positioning frame on the outside of the frame, further reducing the time required for valve detection and diagnosis.

[0016] 4. After the rotating support rotates, the side plate on one side can rotate accordingly. During the rotation of the side plate, the valve in the slot of the side plate rotates accordingly, and the water above the valve plate of the valve can be poured out. At the same time, after the side plate rotates, the valve is close to the ground, which is convenient for removing the valve from the side plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal structure of the present invention.

[0018] Figure 2 It is a cross-sectional view of the centering device.

[0019] Figure 3 It is a schematic diagram for detecting and diagnosing the valve in the slot hole of the continuous edge plate of the present invention.

[0020] Figure 4 It is a schematic diagram when the valve is disassembled.

[0021] Figure 5 It is a schematic diagram when the valve is loaded on the edge plate outside the frame body.

[0022] The names of the components in the attached drawings are:

[0023] 1 bottom plate, 2 water tank, 3 grille plate, 4 support column, 5 top plate, 6 slide rail, 7 edge plate, 8 intermediate plate

[0024] 9 limit block, 10 slot hole, 11 valve, 12 branch pipe, 13 lifting rod, 14 support rod, 15 inserting rod

[0025] 16 upper telescopic cylinder, 17 pressing cover, 18 pressure sensor, 19 inlet pipe, 20 connecting rod, 21 ear seat

[0026] 22 worm gear, 23 bracket, 24 first universal ball, 25 motor, 26 worm, 27 fixed pipe

[0027] 28 rubber pad, 29 lower plate, 30 lower telescopic cylinder, 31 upper plate, 32 lifting ring, 33 upper pipe

[0028] 34 vertical slot, 35 stop block, 36 pin rod, 37 positioning rod, 38 top head, 39 screw rod, 40 second universal ball

[0029] 41 pull rope. Specific implementation manner

[0030] As Figures 1-4 shown, the natural gas long-distance pipeline valve detection and diagnosis device includes a frame body. The frame body includes a bottom plate 1 and a top plate 5, and the four corners of the bottom plate 1 and the top plate 5 are fixedly connected through support columns 4. Water tanks 2 are fixedly arranged on both the left and right sides of the bottom plate 1. The upper ends of the water tanks 2 are open, and grille plates 3 are fixedly arranged inside the upper openings of the water tanks 2.

[0031] An intermediate plate 8 is slidably arranged in the transverse direction inside the frame body. Both the left and right ends of the intermediate plate 8 are rotatably connected with edge plates 7, and the edge plates 7 are parallel to the intermediate plate 8. Guide members are arranged on the two support columns 4 at the front side and the two support columns 4 at the rear side of the frame body, and the two guide members are arranged oppositely.

[0032] The guide member includes two horizontally arranged slide rails 6 arranged up and down, and the intermediate plate 8 and the edge plates 7 are slidably arranged between the upper and lower slide rails 6. A driving device is arranged on the frame body for driving the intermediate plate 8 and the edge plates 7 to move in the transverse direction.

[0033] Rotating support members are provided on the frame body below the side plates 7. The rotating support members are used to support the lower ends of the side plates 7 on one side thereof. The rotating support member includes a connecting rod 20 fixed inside the frame body. An ear seat 21 is fixed on the connecting rod 20. A bracket 23 is rotatably connected inside the ear seat 21 through a rotating rod. The bracket 23 includes a vertical portion and a straight portion. A first universal ball 24 is installed at the upper end of the vertical portion of the bracket 23. The first universal ball 24 is in rolling contact with the lower end of the side plate 7 on one side thereof. The rotating rod is fixedly connected to the bracket 23 and rotatably connected to the ear seat 21. A worm gear 22 is fixed on the rotating rod. A motor 25 is fixed on the connecting rod 20. A worm 26 is fixed on the output shaft of the motor 25. The worm 26 meshes with the worm gear 22.

[0034] Positioning members for supporting the valve 11 are provided on the side plates 7 on both the left and right sides of the slot hole 10. The positioning member includes a vertical branch pipe 12 fixed on the side plate 7. The branch pipe 12 is a square pipe. A lifting rod 13 is slidably inserted into the branch pipe 12. The lifting rod 13 is a square rod. A locking handle for locking the support rod in the branch pipe 12 is threadedly connected to the branch pipe 12. A support rod 14 perpendicular to it is fixed at the upper end of the lifting rod 13. A vertical insertion rod 15 is fixed on the upper side of the end of the support rod 14 away from the lifting rod 13. The insertion rod 15 is used to be inserted into the hole in the upper flange at the upper end of the valve 11 to support and stabilize the valve 11.

[0035] An alignment device is provided inside the lower end of the frame body. A detection head for sealing the upper end of the valve 11 and injecting high-pressure water into the valve 11 is provided inside the frame body above the alignment device.

[0036] The detection head includes an upper telescopic cylinder 16 fixed at the upper end of the top plate 5. A pressure cover 17 is fixed on the telescopic rod of the upper telescopic cylinder 16. An inlet pipe 19 communicating with its interior is fixed on the pressure cover 17. A pressure sensor 18 is fixed at the upper end of the pressure cover 17. The sensing head of the pressure sensor 18 is located in the inner cavity of the pressure cover 17. A sealing ring is fixed at the lower end of the pressure cover 17.

[0037] The centering device includes a fixed tube 27. When the middle plate 8 is located above the fixed tube 27, the lower end surface of the middle plate 8 contacts the upper end of the fixed tube 27. When the side plate 7 is located above the fixed tube 27, the lower end surface of the side plate 7 contacts the upper end of the fixed tube 27. During the reciprocating movement of the middle plate 8 and the side plate 7 in the transverse direction, the lower ends of the middle plate 8 and the side plate 7 alternately slide and contact with the upper end of the fixed plate. The lower end of the fixed tube 27 is fixedly connected to the bottom plate 1. A lifting ring 32 is slidably arranged in the fixed tube 27, and the lifting ring 32 is driven by the lower telescopic cylinder 30 in the fixed tube 27. The lower end of the lower telescopic cylinder 30 is fixed with a lower plate 29, and the lower end of the lower plate 29 is fixed with a rubber pad 28, and the rubber pad 28 is fixedly connected to the bottom plate 1. A conical surface is provided on the outer side of the upper end of the lifting ring 32. An upper tube 33 concentric with the lifting ring 32 is fixed on the inner side of the upper end of the lifting ring 32, and a plurality of straightening rods are evenly arranged on the circumference of the upper end of the upper tube 33. A vertical groove 34 corresponding to the righting rod is provided at the upper end of the upper tube 33, and the righting rod is rotatably arranged in the vertical groove 34 through a pin rod 36. One end of the righting rod facing the axis of the upper tube 33 is connected to the upper plate 31 fixed on the cylinder body of the lower telescopic cylinder 30 through a pull rope 41, and the upper plate 31 is slidably arranged in the fixed tube 27. In the process of the lower telescopic cylinder 30 driving the lifting ring 32 upward, under the pulling force of the pull rope 41, the righting rod tends to be parallel to the horizontal plane, and multiple righting rods rotate at the same angle and spread out in an umbrella shape, thereby righting the valve 11. A stopper 35 for blocking the righting rod is fixed in the vertical groove 34 on the inner side of the pin rod 36. Slots 10 are provided on the side plates 7, and limit blocks 9 are fixed on the upper ends of the side plates 7. When the limit blocks 9 contact the end of the slide rail 6, the slots 10 on the side of the limit blocks 9 contacting the end of the slide rail 6 are concentric with the fixed tube 27 and the detection head.

[0038] The straightening rod includes a positioning rod 37, which is rotatably set in the vertical groove 34 through a pin rod 36. A pull rope 41 is fixedly connected to one end of the positioning rod facing the axis of the upper tube 33. A screw rod 39 concentric with the positioning rod 37 is threadedly connected, and one end of the screw rod 39 extends to the outside of the positioning rod 37. A head 38 is fixed to one end of the screw rod 39 outside the positioning rod 37, and a second universal ball 40 is installed on the head 38.

[0039] When the valve 11 needs to be inspected and diagnosed, the motor 25 located below the side plate 7 outside the frame is started, and the motor 25 drives the worm wheel 22 to rotate through the worm 26. During the rotation of the worm wheel 22, the first universal ball 24 on the bracket 23 rotates downward. During the downward rotation of the first universal ball 24 on the bracket 23, the side plate 7 located outside the frame rotates downward, so that the angle between the rotated side plate 7 and the middle plate 8 is greater than 90 degrees, and then the valve 11 can be installed in the slot 10 of the rotated side plate 7. When installing the valve 11, the lower flange of the valve 11 is located in the slot 10, and then the plug rod 15 is inserted into the hole of the upper flange of the valve 11. Under the plug-in cooperation between the plug rod 15 and the hole on the upper flange of the valve 11, the valve 11 can be supported and stabilized. When loading the valve 11, since the angle between the side plate 7 and the middle plate 8 is greater than 90 degrees, the plug rod 15 is not easy to withdraw from the hole of the upper flange of the valve 11 after the valve 11 is loaded, and the stability of the valve 11 after loading is good.

[0040] After the valve 11 is loaded, the motor 25 located below the side plate 7 outside the frame is started, and the rotating side plate 7 is restored by using the bracket 23. After the side plate 7 is restored, the locking handle is loosened to adjust the height of the support rod 14 so that the lower end of the lower flange of the valve 11 is flush with the lower end of the side plate 7. When the valve 11 moves with the middle plate 8 and the side plate 7, the upper end of the fixed pipe 27 is prevented from blocking the lower end of the valve 11. At the same time, when the valve 11 is located above the fixed pipe 27 and the detection head squeezes the valve 11, the fixed pipe 27 can directly support the valve 11.

[0041] After the valve 11 is loaded into the slot 10 on the side plate 7 outside the frame, the driving device is started to move the side plate 7 outside the frame toward the inside of the frame. Figure 5 As shown, when the left side plate 7 is located outside the frame and the valve 11 has been loaded onto the left side plate 7, the driving device is started to move the side plate 7 and the middle plate 8 to the right, and when the left stopper 9 contacts the left end of the slide rail 6, the slot 10 on the left side plate 7 is concentric with the fixing pipe 27. At this time, the right side plate 7 is located on the right side of the frame.

[0042] Then, the lower telescopic cylinder 30 is started, and the telescopic rod of the lower telescopic cylinder 30 drives the lifting ring 32 and the upper tube 33 to move upward. After the lifting ring 32 contacts the inner edge of the lower end of the lower flange of the valve 11, the valve 11 is lifted up as the lifting ring 32 and the upper tube 33 move upward. During the upward movement of the lifting ring 32 and the upper tube 33, the pull rope 41 is tightened, and the straightening rod tends to be parallel to the horizontal plane. When the conical surface of the lifting ring 32 contacts the inner edge of the lower flange of the valve 11, as the valve 11 is lifted up, the valve 11 can be pre-straightened under the guidance of the conical surface.

[0043] By setting a conical surface to pre-align the valve 11 during its movement, after the lifting ring 32 jacks up the valve 11, under the guiding action of the conical surface on the lifting ring 32, the valve 11 can be roughly aligned with the fixed pipe 27 and the detection head. This can avoid the continuous resistance generated during the driving of the alignment rod that first contacts the inner wall of the part of the valve 11 below the valve plate, and prevent the pull rope 41 from experiencing tensile fatigue due to excessive force, resulting in the failure of subsequent alignment of the valve 11. After the lifting ring 32 jacks up the valve 11, the conical surface can make the valve 11 roughly aligned with the fixed pipe 27. At this time, the inner edge of the lower flange at the lower end of the valve 11 is in line contact with the conical surface. Due to the small contact area, the frictional force during the movement of the valve 11 is small. Therefore, the alignment rod can easily perform subsequent alignment operations on the valve 11. If no conical surface is set, after the lifting ring 32 jacks up the valve 11, only the alignment rod is used to align the valve 11. At this time, the lower end face of the lower flange of the valve 11 contacts the upper end face of the lifting ring 32. During the process of the alignment rod driving and aligning the valve 11, the contact area between the lower flange of the valve 11 and the lifting ring 32 is large, and the frictional force is large. When the eccentric distance between the valve 11 and the fixed pipe 27 is relatively long, when the alignment rod aligns the valve 11, the alignment rod that first contacts the inner wall of the part of the valve 11 below the valve plate needs to drive the valve 11 for a relatively long distance, and the alignment rod that first contacts the inner wall of the part of the valve 11 below the valve plate will be subject to continuous resistance.

[0044] If no conical surface is set on the lifting ring 32 and only the alignment rod is used to align the valve 11, in order to cope with the situation where the eccentric distance between the valve 11 and the fixed pipe 27 is relatively large, and at the same time ensure that the alignment rod on the upper pipe 33 can enter the valve 11 with a relatively large eccentric distance from the fixed pipe 27, the included angle between the alignment rod and the lifting ring 32 needs to be increased, that is, the inclination angle of the alignment rod is increased. Subsequently, in order to enable the alignment rod to effectively align the valve 11, the upward movement distance of the valve 11 needs to be increased. After the upward movement distance of the valve 11 is increased, the distance that the pressure cover 17 needs to squeeze the valve 11 downward is increased, which is not conducive to quickly detecting and diagnosing the valve 11. At the same time, after the downward movement distance of the valve 11 is increased, the deformation degree of the rubber pad 28 is increased, and the rubber pad 28 is easily crushed and damaged.

[0045] When the second universal ball 40 on the alignment rod contacts the inner wall of a part of the valve 11 below the valve plate, the second universal balls 40 on multiple alignment rods uniformly apply a thrust to the inner wall of a part of the valve 11 below the valve plate, and the valve 11 is completely aligned. Then, the upper telescopic cylinder 16 can be started to make the detection head apply pressure to the upper flange at the upper end of the valve 11. When the pressure cover 17 of the detection head presses the upper flange at the upper end of the valve 11, the valve 11, the lifting ring 32, the upper pipe 33, multiple alignment rods, the lower telescopic cylinder 30, and the upper plate 31 descend together and press the rubber pad 28. After the lower flange at the lower end of the valve 11 contacts the upper end of the fixed pipe 27, the pressure cover 17 can seal the upper flange at the upper end of the valve 11 through the sealing ring.

[0046] By providing the rubber pad 28, when the pressure cover 17 presses the upper flange at the upper end of the valve 11, it can ensure that the valve 11 descends and the upper end of the fixed pipe 27 supports the lower flange at the lower end of the valve 11.

[0047] When aligning the valve 11, the top head 38 and the screw 39 can be rotated to adjust the overall height of the alignment rod, and thus the alignment operation can be performed on valves 11 with different diameters.

[0048] During the process of aligning the valve 11 above the fixed pipe 27, another valve 11 can be loaded onto the side plate 7 outside the frame body, and subsequent rapid detection and diagnosis can be performed on the said another valve 11.

[0049] The pressure cover 17 makes the high-pressure pump communicate with the water tank, and the inlet pipe 19 and the high-pressure pump are connected by a high-pressure pipe. The high-pressure pump is started to inject water into the pressure cover 17 and keep a set pressure between the pressure cover 17 and the valve 11. The pressure sensor 18 monitors the pressure change between the pressure cover 17 and the valve 11 in real time. After a set time, if the pressure between the pressure cover 17 and the valve 11 does not decrease, it proves that the sealing performance of the valve 11 is good.

[0050] After the detection and diagnosis of the valve 11 are completed, the valve 11 is moved to the outside of the frame body along with the side plate 7, and then the side plate 7 is rotated. At this time, the water in the valve 11 above the valve plate can be discharged, and the included angle between the side plate 7 and the middle plate 8 is 90 degrees. At this time, the water in the valve 11 can be completely discharged, and then the valve 11 can be unloaded from the side plate 7. The water discharged from the valve 11 can fall into the water tank 2 through the grille plate 3. The water tank 2 can be connected to the water tank through a filter to recycle the water used for detecting and diagnosing the valve 11.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A detection and diagnosis device for valves in long-distance natural gas pipelines, comprising a frame body, characterized in that, A middle plate (8) is slidably arranged in the transverse direction inside the frame body. Both the left and right ends of the middle plate (8) are rotatably connected with side plates (7). A driving device for driving the middle plate (8) and the side plates (7) to move in the transverse direction is arranged on the frame body. The side plates (7) are parallel to the middle plate (8). Rotary supports are arranged on the frame body below the side plates (7), and the rotary supports are used to support the lower ends of the side plates (7) on one side thereof. Slots (10) are formed in the side plates (7). Positioning members for supporting the valve (11) are arranged on the side plates (7) on both the left and right sides of the slots (10). A centering device is arranged inside the lower end of the frame body. A detection head for sealing the upper end of the valve (11) and injecting high-pressure water into the valve (11) is arranged inside the frame body above the centering device. The centering device includes a fixed pipe (27). When the middle plate (8) is located above the fixed pipe (27), the lower end surface of the middle plate (8) contacts the upper end of the fixed pipe (27). When the side plate (7) is located above the fixed pipe (27), the lower end surface of the side plate (7) contacts the upper end of the fixed pipe (27). A lifting ring (32) is slidably arranged inside the fixed pipe (27), and the lifting ring (32) is driven by a lower telescopic cylinder (30) inside the fixed pipe (27). The lower end of the lower telescopic cylinder (30) is elastically connected with the frame body. A conical surface is formed on the outer side of the upper end of the lifting ring (32). An upper pipe (33) concentric with it is fixed inside the upper end of the lifting ring (32). A plurality of centering rods are circumferentially arranged on the upper end of the upper pipe (33). The centering rods are rotatably connected with the upper pipe (33). One end of the centering rod facing the axis of the upper pipe (33) is connected with an upper plate (31) fixed on the cylinder body of the lower telescopic cylinder (30) through a pull rope (41). During the process of the lower telescopic cylinder (30) driving the lifting ring (32) to move upward, under the pulling force of the pull rope (41), the centering rods tend to be parallel to the horizontal plane and center the valve (11). The frame body includes a bottom plate (1) and a top plate (5). The four corners of the bottom plate (1) and the top plate (5) are fixedly connected through columns (4). Water troughs (2) are fixedly arranged on both the left and right sides of the bottom plate (1). The upper ends of the water troughs (2) are open. A grid plate (3) is fixed inside the upper end openings of the water troughs (2). Guide members are arranged on the front two columns (4) and the rear two columns (4). The two guide members are arranged oppositely. The guide member includes two horizontally arranged slide rails (6) arranged up and down. The middle plate (8) and the side plates (7) are slidably arranged between the upper and lower slide rails (6). Limit blocks (9) are fixedly arranged at the upper ends of the side plates (7). When the limit blocks (9) contact the ends of the slide rails (6), the slot (10) on one side of the limit block (9) contacting the end of the slide rail (6) is concentric with the fixed pipe (27) and the detection head. The rotating support member comprises a connecting rod (20) fixed in a frame body, an ear seat (21) is fixed on the connecting rod (20), a bracket (23) is rotatably connected in the ear seat (21) via a rotating rod, the bracket (23) comprises a vertical portion and a flat portion, a first universal ball (24) is mounted on the upper end of the vertical portion of the bracket (23), the first universal ball (24) is in rolling contact with the lower end of a side plate (7) on one side thereof, the rotating rod is fixedly connected to the bracket (23), the rotating rod is rotatably connected to the ear seat (21), a worm gear (22) is fixed on the rotating rod, a motor (25) is fixed on the connecting rod (20), a worm (26) is fixed on the output shaft of the motor (25), and the worm gear (26) is meshed with the worm gear (22).

2. The natural gas long-distance pipeline valve detection and diagnosis device according to claim 1, wherein The lower end of the fixed tube (27) is fixedly connected to the bottom plate (1), the upper plate (31) is slidably arranged in the fixed tube (27), the lower end of the lower telescopic cylinder (30) is fixed with a lower plate (29), the lower end of the lower plate (29) is fixed with a rubber pad (28), the rubber pad (28) is fixedly connected to the lower end of the frame, the upper end of the upper tube (33) is provided with a vertical groove (34) corresponding to the righting rod, the righting rod is rotatably arranged in the vertical groove (34) through a pin rod (36), and the vertical groove (34) on the inner side of the pin rod (36) is provided with a vertical groove (34) corresponding to the righting rod. A stopper (35) is fixed inside the vertical groove (34) for blocking the straightening rod. The straightening rod includes a positioning rod (37). The positioning rod (37) is rotatably arranged in the vertical groove (34) through a pin rod (36). A screw rod (39) concentric with the positioning rod (37) is threadedly connected. One end of the screw rod (39) extends to the outside of the positioning rod (37). A head (38) is fixed to one end of the screw rod (39) outside the positioning rod (37). A second universal ball (40) is installed on the head (38).

3. The natural gas long-distance pipeline valve detection and diagnosis device according to claim 1, wherein The positioning member comprises a vertical branch pipe (12) fixed on the side plate (7), the branch pipe (12) being a square pipe, a lifting rod (13) being slidably inserted in the branch pipe (12), the lifting rod (13) being a square rod, a locking handle being threadedly connected on the branch pipe (12) for locking the processing branch rod in the branch pipe (12), a supporting rod (14) being fixed perpendicular to the lifting rod (13) at the upper end thereof, a vertical inserting rod (15) being fixed on the upper side of one end of the supporting rod (14) away from the lifting rod (13), the inserting rod (15) being used for inserting into a hole on an upper flange at the upper end of the valve (11) so as to support and stabilize the valve (11).

4. The natural gas long-distance pipeline valve detection and diagnosis device according to claim 1, wherein The detection head comprises an upper telescopic cylinder (16) fixed to the upper end of a frame, a pressure cover (17) is fixed on the telescopic rod of the upper telescopic cylinder (16), an inlet pipe (19) connected to the interior of the pressure cover (17) is fixed on the pressure cover (17), a pressure sensor (18) is fixed on the upper end of the pressure cover (17), a sensing head of the pressure sensor (18) is located in the inner cavity of the pressure cover (17), and a sealing ring is fixed on the lower end of the pressure cover (17).

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