A leakage detection device for a natural gas storage tank

Abstract

The present invention relates to the technical field of leak detection, and discloses a leak detection device for a natural gas storage tank. The leak detection device for the natural gas storage tank includes a bottom plate, and a storage tank body is arranged at the top of the bottom plate. In order to better perform leak detection, the leak detection device for the natural gas storage tank is provided with a detection component, which cooperates with a bracket and self-locking universal wheels to better move the detection component body. The vertical hydraulic cylinder is used to make the cross plate, vertical rod and circular ring plate move up and down, so as to better perform coaxial centering adjustment with storage tank bodies of more sizes. The servo slide rail and asynchronous motor are used to make the rotating shaft drive the driving gear to rotate, and the driven gear is used to make the connecting rod and U-shaped frame rotate. The central hydraulic cylinder is started, and the flexible induction material is wrapped and pressed tightly against the area to be detected by the arc-shaped pressing plate and elastic sheet. Whether the data processing unit receives the digital signal value of the flexible induction material is judged. If it exceeds the threshold value, it indicates that there is natural gas leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of leakage detection, and particularly to a leakage detection device for a natural gas storage tank. Background Technique

[0002] With the continuous growth of the global demand for clean energy, natural gas, as a relatively clean and efficient energy source, is increasing its proportion in the energy structure. As a key facility in the storage and transportation of natural gas, leakage detection is the core link to ensure the safe operation of natural gas storage tanks.

[0003] At present, horizontal storage tanks often use gas sensors to detect trace natural gas leakage. However, some existing leakage detection devices have a single detection method, resulting in inaccurate detection results. It is difficult to conveniently and flexibly detect the leakage of horizontal storage tanks through multiple methods. Some detection devices may only cover some areas of the tank body.

[0004] For example, transverse welds can be conveniently detected, but it is impossible to comprehensively detect the annular welds and annular flange joints on the tank body surface. This may lead to the omission of some leakage points, increasing potential safety hazards, and lacking stability. The practicality also needs to be improved. In view of this, we have proposed a leakage detection device for a natural gas storage tank. Summary of the Invention

[0005] The purpose of the present invention is to provide a leakage detection device for a natural gas storage tank to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A leakage detection device for a natural gas storage tank, including a bottom plate. A storage tank body is provided at the top of the bottom plate. A detection component is provided outside the storage tank body. The detection component includes:

[0008] A bracket. A bracket is provided at the top of the bottom plate. A self-locking universal wheel is provided at the bottom of the bracket. The bottom fixed end of a vertical hydraulic cylinder is fixedly connected to the top of the bracket. The piston end of the top of the vertical hydraulic cylinder is fixedly installed with a cross plate. A vertical rod is fixedly installed at the bottom of the cross plate. A circular ring plate is fixedly installed at the bottom of the vertical rod. A driven gear is rotatably installed on the arc-shaped outer wall of the circular ring plate.

[0009] A servo slide rail. A servo slide rail is fixedly installed on the side wall of the bracket. The bottom of an asynchronous motor is fixedly installed on the outer wall of the moving block inside the servo slide rail. A rotating shaft is fixedly installed at the output end of the asynchronous motor. A driving gear is fixedly installed on the outer wall of the rotating shaft. The driving gear meshes with the driven gear. One end of a connecting rod is fixedly installed on the inner wall of the driven gear. The other end of the connecting rod is fixedly connected to the center of the side wall of a U-shaped frame.

[0010] A first asynchronous motor is fixedly installed on the outer wall of one end of the U-shaped frame. The output end of the first asynchronous motor is fixedly installed with a bidirectional lead screw. The bidirectional lead screw is rotatably installed on the U-shaped frame. The fixed end of the central hydraulic cylinder is fixedly connected to the center of the inner wall of the U-shaped frame. The bidirectional lead screw penetrates through the fixed end of the central hydraulic cylinder. The piston end of the central hydraulic cylinder is fixedly connected to the center of the outer wall of one end of the arc-shaped pressing plate. Elastic sheets are fixedly installed on the side wall of the arc-shaped pressing plate. There are two groups of elastic sheets. A flexible sensing material is fixedly installed between the two groups of elastic sheets and the arc-shaped pressing plate. The flexible sensing material is made of semiconductor metal oxide. Oxygen molecules will be adsorbed on the surface of the semiconductor metal oxide to form oxygen anions. When the combustible gas methane in natural gas contacts its surface, an oxidation-reduction reaction will occur with the oxygen anions, resulting in a change in the electron concentration on the surface of the semiconductor metal oxide, thereby changing the electrical resistance performance of the material and generating an electrical signal;

[0011] Side hydraulic cylinders. The fixed end of the side hydraulic cylinder is threadedly installed on the bidirectional lead screw. The piston end of the side hydraulic cylinder is fixedly installed with an arc-shaped side plate. A data processing unit is fixedly installed on the outer wall of the U-shaped frame. The flexible sensing material is connected to the data processing unit through a microcircuit.

[0012] Preferably, there are two groups of the brackets, self-locking universal wheels, vertical hydraulic cylinders and vertical rods. And the two groups of the brackets, self-locking universal wheels, vertical hydraulic cylinders and vertical rods are mirror-symmetrically arranged at both ends of the cross plate with the vertical center line of the cross plate as the mirror axis, so that the up and down movement of the ring plate is more stable.

[0013] Preferably, there are two groups of the side hydraulic cylinders and the arc-shaped side plates. And the two groups of the side hydraulic cylinders and the arc-shaped side plates are mirror-symmetrically arranged at both ends of the bidirectional lead screw with the vertical center line of the bidirectional lead screw as the mirror axis, further clamping the flexible sensing material, so that the sealing performance of the area to be detected is better.

[0014] Preferably, the flexible sensing material and the area to be detected of the storage tank body are in the same vertical plane, and the flexible sensing material is closely attached to the outside of the area to be detected.

[0015] Preferably, an auxiliary component is arranged outside the ring plate. The auxiliary component includes a wheel frame. The wheel frame is fixedly installed at the end of the U-shaped frame away from the first asynchronous motor. A roller is rotatably installed inside the wheel frame. The roller rolls and fits on the arc-shaped outer wall of the ring plate.

[0016] Preferably, gas sensors are fixedly installed on the piston ends of the side hydraulic cylinders. There are two groups of gas sensors, further determining whether there is leakage in the area to be detected, increasing the detection method, and making the result more accurate.

[0017] Preferably, one end of a sliding sleeve is fixedly installed on the arc-shaped outer wall of the circular ring plate, and the other end of the sliding sleeve is slidably attached to the arc-shaped outer wall of the bracket. Two sets of sliding sleeves are provided to make the up-and-down movement of the circular ring plate more stable.

[0018] Preferably, a centering assembly is arranged outside the horizontal plate. The centering assembly includes a horizontal hydraulic cylinder. The fixed end of the horizontal hydraulic cylinder is fixedly installed on the central outer wall of the horizontal plate. The piston end of the horizontal hydraulic cylinder is fixedly installed with a fixed frame. A second asynchronous motor is fixedly installed on the outer wall of the fixed frame. One end of an L-shaped plate is fixedly connected to the outside of the output shaft of the second asynchronous motor. A circular frame is fixedly installed at the other end of the L-shaped plate. A third asynchronous motor is fixedly installed inside the circular frame. A threaded rod is fixedly installed at the output end of the third asynchronous motor. A threaded block is threadedly installed on the threaded rod. One end of a first hinge rod is hingedly installed on the threaded block. The other end of the first hinge rod is hingedly installed on a second hinge rod. One end of the second hinge rod is hingedly installed on the circular frame. A clamping plate is hingedly installed at the other end of the second hinge rod. An auxiliary rod is hingedly installed between the clamping plate and the circular frame. A first pressure sensor is fixedly installed inside the end of the clamping plate away from the circular frame.

[0019] Preferably, there are multiple sets of the first hinge rod, the second hinge rod, the auxiliary rod, the clamping plate and the first pressure sensor. And the multiple sets of the first hinge rod, the second hinge rod, the auxiliary rod, the clamping plate and the first pressure sensor are equally spaced in a circumferential array with the center of the circular cross-section of the circular frame as the array center. And when the top end of the L-shaped plate is kept horizontal, the centers of the circular cross-sections of the circular frame and the circular ring plate are coaxial. After initially forming the clamping and fixing effect, it can also assist in the coaxial centering adjustment of the circular ring plate in the detection assembly and the storage tank body.

[0020] Preferably, a fixing assembly is arranged on the fixed frame. The fixing assembly includes a moving rod. The top end of the moving rod is fixedly installed on the outer wall of the fixed frame. An auxiliary ring is fixedly installed at the bottom end of the moving rod. The centers of the circular cross-sections of the auxiliary ring and the circular ring plate are coaxial. The fixed end of an inclined hydraulic cylinder is fixedly connected inside the arc-shaped side wall of the auxiliary ring. A second pressure sensor is fixedly installed inside the piston end of the inclined hydraulic cylinder. There are multiple sets of the inclined hydraulic cylinder and the second pressure sensor, which jointly form the clamping and fixing effect and can also assist in the coaxial centering adjustment of the circular ring plate in the detection assembly and the storage tank body.

[0021] Compared with the prior art, the present invention provides a leakage detection device for a natural gas storage tank, having the following beneficial effects:

[0022] 1. The leakage detection device for the natural gas storage tank, in order to better detect the leakage of the storage tank body, by setting up a detection component, cooperating with a bracket and a self-locking universal wheel, can better move the detection component body. Cooperating with a vertical hydraulic cylinder, the cross plate, vertical rod and circular ring plate can move up and down, so as to better perform coaxial centering adjustment with storage tank bodies of more sizes. Cooperating with a servo slide rail and an asynchronous motor, the rotating shaft drives the driving gear to rotate, and cooperating with a driven gear, the connecting rod and U-shaped frame rotate. Start the central hydraulic cylinder, and cooperate with the arc-shaped pressing plate and elastic sheet to make the flexible sensing material wrap and tightly adhere to the area to be detected. By whether the data processing unit receives the digital signal value of the flexible sensing material, if it exceeds the threshold value, it indicates that there is natural gas leakage. Start the first asynchronous motor, and cooperate with a bidirectional lead screw to make two side hydraulic cylinders drive the arc-shaped side plates to move towards each other, further clamping the flexible sensing material, making the airtightness of the area to be detected better, and then can better detect the leakage of the storage tank body.

[0023] 2. The leakage detection device for the natural gas storage tank, in order to make the detection process of the detection component more stable, is provided with an auxiliary component. When the U-shaped frame rotates, it will drive the wheel frame to rotate synchronously, so that while the rollers revolve synchronously, they can also roll and rotate on the arc-shaped outer wall of the circular ring plate, making the rotation of the U-shaped frame more stable. At the same time, cooperating with the monitoring of the gas sensor outside the area to be detected, it can further determine whether there is leakage in this area, increasing the detection method and making the result more accurate. When the circular ring plate moves up and down, it drives the sliding sleeve to slide synchronously on the bracket, and then makes the detection process of the detection component more stable.

[0024] 3. The leakage detection device for the natural gas storage tank, in order to make the detection component better detect, is provided with a centering component. When the detection component moves to the target detection area, that is, when the arc-shaped pressing plate and the annular weld or flange connection to be detected are in the same vertical plane, start the horizontal hydraulic cylinder, so that the fixed frame can move horizontally. When starting the second asynchronous motor, the L-shaped plate can swing vertically. Thus, when the top of the L-shaped plate remains horizontal, the centers of the circular cross-sections of the circular frame and the circular ring plate in the detection component are coaxial. Then start the third asynchronous motor, make the threaded rod rotate, and make the threaded block move along the axial direction of the threaded rod. Cooperating with the first hinge rod, second hinge rod and auxiliary rod, multiple groups of clamping plates can move together to tightly adhere to the arc-shaped outer wall of the storage tank body. After initially forming the effect of clamping and fixing, by observing whether multiple groups of first pressure sensors simultaneously have contact feedback values, it can also assist the circular ring plate in the detection component to perform coaxial centering adjustment with the storage tank body.

[0025] 4. For the leakage detection device of this natural gas storage tank, in order to make the detection process of the detection component more stable, a fixing component is provided. When the detection component moves to the target detection area, that is, after the arc-shaped pressing plate and the annular weld or flange connection to be detected are in the same vertical plane, in cooperation with the horizontal hydraulic cylinder in the centering component, the moving rod can move horizontally, driving the auxiliary ring to move synchronously. When multiple groups of inclined hydraulic cylinders are started simultaneously, the front ends of the piston rods of multiple groups of inclined hydraulic cylinders simultaneously abut against the arc-shaped outer wall of the storage tank body, jointly forming a clamping and fixing effect, making the detection process more stable. At the same time, by observing whether there are contact feedback values from multiple groups of second pressure sensors, it is also possible to assist in the centering adjustment of the circular ring plate in the detection component and the storage tank body to be coaxial. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front top view schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a top view schematic diagram of the overall structure of the present invention from another perspective;

[0028] Figure 3 For the present invention Figure 2 It is an enlarged schematic diagram of the structure in area A of the present invention;

[0029] Figure 4 It is a back top view schematic diagram of the overall structure of the present invention;

[0030] Figure 5 For the present invention Figure 4 It is an enlarged schematic diagram of the structure in area B of the present invention;

[0031] Figure 6 For the present invention Figure 4 It is an enlarged schematic diagram of the structure in area C of the present invention;

[0032] Figure 7 It is a sectional view schematic diagram of the storage tank body of the present invention;

[0033] Figure 8 For the present invention Figure 7 It is an enlarged schematic diagram of the structure in area D of the present invention;

[0034] Figure 9 For the present invention Figure 7 It is an enlarged schematic diagram of the structure in area E of the present invention;

[0035] Figure 10 It is an exploded view of a part of the structure of the present invention;

[0036] Figure 11 It is a sectional view schematic diagram of the driven gear of the present invention.

[0037] In the figure: 1, bottom plate; 2, storage tank body; 3, detection component; 31, bracket; 32, self-locking universal wheel; 33, vertical hydraulic cylinder; 34, cross plate; 35, vertical rod; 36, circular ring plate; 37, driven gear; 38, servo slide rail; 39, asynchronous motor; 310, rotating shaft; 311, driving gear; 312, connecting rod; 313, U-shaped frame; 314, first asynchronous motor; 315, bidirectional lead screw; 316, central hydraulic cylinder; 317, arc-shaped pressing plate; 318, elastic sheet; 319, flexible sensing material; 320, side hydraulic cylinder; 321, arc-shaped side plate; 322, data processing unit; 4, auxiliary component; 41, wheel frame; 42, roller; 43, gas sensor; 44, sliding sleeve; 5, centering component; 51, horizontal hydraulic cylinder; 52, fixing frame; 53, second asynchronous motor; 54, L-shaped plate; 55, circular frame; 56, third asynchronous motor; 57, threaded rod; 58, threaded block; 59, first hinge rod; 510, second hinge rod; 511, auxiliary rod; 512, clamping plate; 513, first pressure sensor; 6, fixing component; 61, moving rod; 62, auxiliary ring; 63, inclined hydraulic cylinder; 64, second pressure sensor. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] In the present application, the orientation or positional relationship indicated by the term "upper" is based on the orientation or positional relationship shown in the accompanying drawings. It is mainly for better describing the present application and its embodiments, and is not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation. And, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific situations.

[0040] Please refer to Figure 1 - Figure 11 , the present invention provides a technical solution:

[0041] A leakage detection device for a natural gas storage tank, including a bottom plate 1, and a storage tank body 2 is arranged at the top end of the bottom plate 1.

[0042] In an embodiment of the present invention, a detection component 3 is arranged outside the storage tank body 2. The detection component 3 includes a bracket 31. The bracket 31 is arranged at the top end of the bottom plate 1. The bottom end of the bracket 31 is provided with a self-locking universal wheel 32. The fixed end of the bottom end of the vertical hydraulic cylinder 33 is fixedly connected to the top of the bracket 31. The piston end of the top end of the vertical hydraulic cylinder 33 is fixedly installed with a cross plate 34. The bottom of the cross plate 34 is fixedly installed with a vertical rod 35. The bottom end of the vertical rod 35 is fixedly installed with an annular plate 36. In addition, there are two sets of the bracket 31, the self-locking universal wheel 32, the vertical hydraulic cylinder 33 and the vertical rod 35. And the two sets of the bracket 31, the self-locking universal wheel 32, the vertical hydraulic cylinder 33 and the vertical rod 35 are mirror-symmetrically arranged at both ends of the cross plate 34 with the vertical center line of the cross plate 34 as the mirror axis, so that the annular plate 36 moves up and down more stably. The arc-shaped outer wall of the annular plate 36 is rotatably installed with a driven gear 37. The side wall of the bracket 31 is fixedly installed with a servo slide rail 38. The outer wall of the movable block inside the servo slide rail 38 is fixedly installed with the bottom of an asynchronous motor 39. The output end of the asynchronous motor 39 is fixedly installed with a rotating shaft 310. The outer wall of the rotating shaft 310 is fixedly installed with a driving gear 311. The driving gear 311 meshes with the driven gear 37. One end of a connecting rod 312 is fixedly installed on the inner wall of the driven gear 37. The other end of the connecting rod 312 is fixedly connected to the center of the side wall of a U-shaped frame 313. One end of the outer wall of the U-shaped frame 313 is fixedly installed with a first asynchronous motor 314. The output end of the first asynchronous motor 314 is fixedly installed with a bidirectional lead screw 315. The bidirectional lead screw 315 is rotatably installed on the U-shaped frame 313. The fixed end of the center hydraulic cylinder 316 is fixedly connected to the center of the inner wall of the U-shaped frame 313. The bidirectional lead screw 315 passes through the fixed end of the center hydraulic cylinder 316. The piston end of the center hydraulic cylinder 316 is fixedly connected to the center of one end of the outer wall of an arc-shaped pressing plate 317. The side wall of the arc-shaped pressing plate 317 is fixedly installed with elastic pieces 318. There are two sets of the elastic pieces 318. A flexible sensing substance 319 is fixedly installed between the two sets of elastic pieces 318 and the arc-shaped pressing plate 317. The flexible sensing substance 319 is made of semiconductor metal oxide. The semiconductor metal oxide is zinc oxide or tin dioxide. Oxygen molecules will be adsorbed on the surface of the semiconductor metal oxide to form oxygen anions. When the combustible gas methane in natural gas contacts its surface, an oxidation-reduction reaction will occur with the oxygen anions, resulting in a change in the electron concentration on the surface of the semiconductor metal oxide, thereby changing the electrical resistance performance of the material and generating an electrical signal. The fixed end of a side hydraulic cylinder 320 is threadedly installed on the bidirectional lead screw 315. The piston end of the side hydraulic cylinder 320 is fixedly installed with an arc-shaped side plate 321. A data processing unit 322 is fixedly installed on the outer wall of the U-shaped frame 313. The flexible sensing substance 319 is connected to the data processing unit 322 through a microcircuit. In addition, there are two sets of the side hydraulic cylinder 320 and the arc-shaped side plate 321. And the two sets of the side hydraulic cylinder 320 and the arc-shaped side plate 321 are mirror-symmetrically arranged at both ends of the bidirectional lead screw 315 with the vertical center line of the bidirectional lead screw 315 as the mirror axis to further clamp the flexible sensing substance 319, making the seal of the area to be detected better. In addition,The flexible induction material 319 is in the same vertical plane as the area to be detected of the storage tank body 2, and the flexible induction material 319 is closely attached to the outside of the area to be detected.

[0043] When this embodiment is in use, the staff member moves the self-locking universal wheel 32, so that the bracket 31 drives the entire detection assembly 3 to move smoothly to a suitable position near the storage tank body 2. Then, the vertical hydraulic cylinder 33 is started, and the piston end of the vertical hydraulic cylinder 33 drives the cross plate 34 fixedly connected thereto to move up and down. The movement of the cross plate 34 will cause the vertical rod 35 and the circular ring plate 36 to move up and down synchronously, so as to adapt to storage tank bodies 2 with more outer diameter sizes and more different ground clearances, and prepare for the subsequent detection work. If the driven gear 37 moves up and down following the circular ring plate 36 at this time, in order to avoid the meshing transmission between the driving gear 311 and the driven gear 37 from interfering with the up and down movement of the circular ring plate 36, it is necessary to adjust the servo slide rail 38 to make the driving gear 311 disengage from the meshing with the driven gear 37 first;

[0044] When the servo slide rail 38 is started, the asynchronous motor 39 will move horizontally synchronously with the moving block inside the servo slide rail 38. Then, the asynchronous motor 39 is started, and the rotating shaft 310 begins to rotate, driving the driving gear 311 to rotate. When the driving gear 311 meshes with the driven gear 37, the driven gear 37 will rotate with the rotation of the driving gear 311, thereby driving the connecting rod 312 to rotate. The rotation of the connecting rod 312 will cause the U-shaped frame 313 to rotate synchronously. When the central hydraulic cylinder 316 and the area to be detected of the storage tank body 2 are in the same vertical plane, the central hydraulic cylinder 316 is started. The piston end of the central hydraulic cylinder 316 pushes the arc-shaped pressing plate 317 towards the area to be detected of the storage tank body 2. Since elastic pieces 318 are fixedly installed on the side wall of the arc-shaped pressing plate 317 and the two elastic pieces 318 have elasticity, the movement of the arc-shaped pressing plate 317 will drive the elastic pieces 318 and the flexible sensing substance 319 to approach the area to be detected together, and finally the flexible sensing substance 319 tightly wraps and adheres to the area to be detected. The flexible sensing substance 319 is made of semiconductor metal oxides, such as zinc oxide or tin dioxide. Oxygen molecules will be adsorbed on the surface of this semiconductor metal oxide to form oxygen anions. When the combustible gas methane in natural gas contacts its surface, an oxidation-reduction reaction will occur with the oxygen anions, resulting in a change in the electron concentration on the surface of the semiconductor metal oxide, thereby changing the electrical resistance performance of the material and generating an electrical signal. The generated electrical signal is transmitted to the data processing unit 322 through a microcircuit. After receiving the digital signal, the data processing unit 322 will compare it with a preset threshold value. This threshold value is comprehensively determined based on factors such as the electrical signals generated by the chemical sensing substance in the normal environment of natural gas and possible interference signals. If the value of the received digital signal exceeds the threshold value, it indicates that there is a natural gas leak. While the flexible sensing substance 319 starts to detect, the first asynchronous motor 314 is started. The output end of the first asynchronous motor 314 drives the bidirectional lead screw 315 to rotate. When the bidirectional lead screw 315 rotates, the two side hydraulic cylinders 320 will drive the arc-shaped side plates 321 to move closer to each other, further clamping the flexible sensing substance 319, making the seal of the area to be detected better and helping to improve the accuracy of detection.

[0045] In an embodiment of the present invention, an auxiliary component 4 is provided outside the circular ring plate 36. The auxiliary component 4 includes a wheel frame 41. One end of the U-shaped frame 313 away from the first asynchronous motor 314 is fixedly installed with the wheel frame 41. A roller 42 is rotatably installed inside the wheel frame 41. The roller 42 rolls and fits on the arc-shaped outer wall of the circular ring plate 36. In addition, a gas sensor 43 is fixedly installed on the piston end of the side hydraulic cylinder 320. There are two groups of gas sensors 43 to further determine whether there is leakage in the area to be detected, add detection methods, and make the results more accurate. In addition, one end of a sliding sleeve 44 is fixedly installed on the arc-shaped outer wall of the circular ring plate 36, and the other end of the sliding sleeve 44 slides and fits on the arc-shaped outer wall of the support 31. There are two groups of sliding sleeves 44, making the up and down movement of the circular ring plate 36 more stable.

[0046] When in use in this embodiment, when the U-shaped frame 313 rotates, it will drive the wheel frame 41 to rotate synchronously. During the rotation of the wheel frame 41, the roller 42 will not only revolve with the wheel frame 41, but also rotate on the arc-shaped outer wall of the circular ring plate 36. This combined movement of revolution and rotation can effectively balance the centrifugal force and torque generated when the U-shaped frame 313 rotates, so that the U-shaped frame 313 rotates more stably, and thus ensure the stability of the entire detection process; during the up and down movement of the circular ring plate 36, the sliding sleeve 44 will slide synchronously on the arc-shaped outer wall of the support 31. The sliding of the sliding sleeve 44 can provide a stable guiding effect for the up and down movement of the circular ring plate 36, preventing the circular ring plate 36 from shifting or shaking during the up and down movement, making the position of the detection component 3 more stable during the detection process, helping to improve the accuracy of the detection result. At the same time, the gas sensor 43 moves synchronously to the outside of the area to be detected for monitoring. The gas sensor 43 further determines whether there is leakage in this area by detecting parameters such as the natural gas concentration in the surrounding environment of the area to be detected. By combining multiple detection methods and adding detection methods, the detection result is made more accurate and reliable. It should be noted that the gas sensor 43 is an existing device of the prior art, and its working principle will not be elaborated here.

[0047] In an embodiment of the present invention, a centering component 5 is provided outside the transverse plate 34. The centering component 5 includes a transverse hydraulic cylinder 51. The fixed end of the transverse hydraulic cylinder 51 is fixedly installed on the outer wall of the center of the transverse plate 34. The piston end of the transverse hydraulic cylinder 51 is fixedly installed with a fixed frame 52. The outer wall of the fixed frame 52 is fixedly installed with a second asynchronous motor 53. One end of an L-shaped plate 54 is fixedly connected to the outside of the output shaft of the second asynchronous motor 53. The other end of the L-shaped plate 54 is fixedly installed with a circular frame 55. A third asynchronous motor 56 is fixedly installed inside the circular frame 55. The output end of the third asynchronous motor 56 is fixedly installed with a threaded rod 57. A threaded block 58 is threadedly installed on the threaded rod 57. One end of a first hinge rod 59 is hingedly installed on the threaded block 58. The other end of the first hinge rod 59 is hingedly installed on a second hinge rod 510. One end of the second hinge rod 510 is hingedly installed on the circular frame 55. The other end of the second hinge rod 510 is hingedly installed with a clamping plate 512. An auxiliary rod 511 is hingedly installed between the clamping plate 512 and the circular frame 55. A first pressure sensor 513 is fixedly installed inside the end of the clamping plate 512 away from the circular frame 55. In addition, there are four groups of the first hinge rod 59, the second hinge rod 510, the auxiliary rod 511, the clamping plate 512 and the first pressure sensor 513. The four groups of the first hinge rod 59, the second hinge rod 510, the auxiliary rod 511, the clamping plate 512 and the first pressure sensor 513 are equally spaced in a circumferential array with the center of the circular cross-section of the circular frame 55 as the array center. And when the top end of the L-shaped plate 54 is kept horizontal, the centers of the circular cross-sections of the circular frame 55 and the annular plate 36 are coaxial. After initially forming the effect of clamping and fixing, it can also assist the centering adjustment of the annular plate 36 in the detection component 3 and the storage tank body 2 to be coaxial.

[0048] When this embodiment is in use, when the detection component 3 moves to the target detection area, that is, when the arc-shaped pressing plate 317 and the annular weld or flange connection to be detected are in the same vertical plane, the transverse hydraulic cylinder 51 is started. The piston end of the transverse hydraulic cylinder 51 pushes the fixed frame 52 to move horizontally. Subsequently, the second asynchronous motor 53 is started. The output shaft of the second asynchronous motor 53 drives the L-shaped plate 54 to swing vertically. When the top of the L-shaped plate 54 swings to a horizontal state, at this time, the centers of the circular cross-sections of the circular frame 55 and the circular ring plate 36 are coaxial. Immediately afterwards, the third asynchronous motor 56 is started. The output end of the third asynchronous motor 56 drives the threaded rod 57 to start rotating. Since the threaded block 58 is threadedly connected to the threaded rod 57, during the rotation of the threaded rod 57, the threaded block 58 will move along the axial direction of the threaded rod 57. The movement of the threaded block 58 will drive the first hinge rod 59 hingedly installed therewith to move synchronously. The movement of the first hinge rod 59 will cause the second hinge rod 510 to rotate around its hinge point with the circular frame 55. At the same time, the auxiliary rod 511 plays a role in supporting and guiding, so that multiple groups of clamping plates 512 jointly approach and closely adhere to the arc-shaped outer wall of the storage tank body 2, forming a preliminary fixing effect. During this process, it is necessary to continuously observe the numerical changes of multiple groups of first pressure sensors 513 in cooperation with the controller. The staff fine-tune the position of the circular ring plate 36 by moving the support 31 and adjusting the ground clearance of the cross plate 34 again until multiple groups of first pressure sensors 513 simultaneously have contact feedback values. At this time, it indicates that the centers of the circular cross-sections between the circular ring plate 36 and the storage tank body 2 have been made coaxial.

[0049] In an embodiment of the present invention, a fixing component 6 is provided on the fixed frame 52. The fixing component 6 includes a moving rod 61. The top of the moving rod 61 is fixedly installed on the outer wall of the fixed frame 52. The bottom of the moving rod 61 is fixedly installed with an auxiliary ring 62. The centers of the circular cross-sections of the auxiliary ring 62 and the circular ring plate 36 are coaxial. The fixed end of the inclined hydraulic cylinder 63 is fixedly connected to the inner part of the arc-shaped side wall of the auxiliary ring 62. The piston end of the inclined hydraulic cylinder 63 is fixedly installed with a second pressure sensor 64. There are three groups of the inclined hydraulic cylinder 63 and the second pressure sensor 64, and the three groups of the inclined hydraulic cylinder 63 and the second pressure sensor 64 are circumferentially arranged at equal intervals with the center of the circular cross-section of the auxiliary ring 62 as the array center, jointly forming a clamping and fixing effect, and can also assist in the centering adjustment of the circular ring plate 36 in the detection component 3 and the storage tank body 2 to be coaxial.

[0050] When this embodiment is in use, after the detection component 3 reaches the target detection area, with the movement of the horizontal hydraulic cylinder 51 in the centering component 5, the moving rod 61 connected thereto will move horizontally synchronously with the fixed frame 52, and the auxiliary ring 62 will also move synchronously. At this time, start multiple diagonal hydraulic cylinders 63. The front ends of the piston ends of the diagonal hydraulic cylinders 63 can simultaneously abut against the arc-shaped outer wall of the storage tank body 2, thereby jointly forming a clamping and fixing effect. During this process, the staff observes the values of multiple second pressure sensors 64, adjusts the position of the circular ring plate 36 by moving the support 31 and readjusting the ground clearance of the cross plate 34. When multiple second pressure sensors 64 simultaneously have contact feedback values, it indicates that the coaxial centering of the center of the circular cross-section between the circular ring plate 36 and the storage tank body 2 has been achieved. If there are other protruding pipelines or other equipment blocking at one end of the storage tank body 2, resulting in possible contact interference between the circular frame 55 in the centering component 5 and it, at this time, it is necessary to start the second asynchronous motor 53. The output shaft of the second asynchronous motor 53 rotates to drive the L-shaped plate 54 to rotate in the reverse direction, and then drives the circular frame 55 to swing upward to avoid the blocking object. In this case, only rely on the fixing component 6 to perform centering adjustment, and repeat the operation steps of the fixing component 6 until the coaxial centering of the circular ring plate 36 and the storage tank body 2 is achieved.

[0051] Among them, the electrical components appearing in this application document are all electrically connected to the controller with a built-in display screen and 220V mains power or the power supply equipped by itself, and the controller is a conventional known device that can control the vertical hydraulic cylinder 33, servo slide rail 38, asynchronous motor 39, first asynchronous motor 314, central hydraulic cylinder 316, flexible sensing material 319, side hydraulic cylinder 320, data processing unit 322, gas sensor 43, horizontal hydraulic cylinder 51, second asynchronous motor 53, third asynchronous motor 56, first pressure sensor 513, diagonal hydraulic cylinder 63, and second pressure sensor 64. The standard parts used in this application document can all be purchased from the market. The specific connection methods of each part are all connected by conventional means such as riveting and welding in the prior art, and the machines, parts, and equipment all adopt conventional models in the prior art. Coupled with the circuit connection adopting the conventional connection method in the prior art, no specific description will be made here.

[0052] The present invention has been generally described in detail above, but based on the present invention, some modifications or improvements can be made, which are obvious to those of ordinary skill in the art. Therefore, the modifications or improvements made without departing from the spirit of the present invention are all within the protection scope of the present invention.

Claims

1. A leakage detection device for a natural gas storage tank, comprising a bottom plate (1), and a storage tank body (2) is arranged at the top end of the bottom plate (1), characterized in that Further included are: A detection component (3). The detection component (3) is arranged outside the storage tank body (2). The detection component (3) includes a bracket (31). The bracket (31) is arranged at the top end of the bottom plate (1). A self-locking universal wheel (32) is arranged at the bottom end of the bracket (31). The fixed end of the bottom end of a vertical hydraulic cylinder (33) is fixedly connected to the top of the bracket (31). The piston end of the top end of the vertical hydraulic cylinder (33) is fixedly installed with a cross plate (34). A vertical rod (35) is fixedly installed at the bottom of the cross plate (34). A circular ring plate (36) is fixedly installed at the bottom end of the vertical rod (35). A driven gear (37) is rotatably installed on the arc-shaped outer wall of the circular ring plate (36). A servo slide rail (38) is fixedly installed on the side wall of the bracket (31). The bottom of an asynchronous motor (39) is fixedly installed on the outer wall of the movable block inside the servo slide rail (38). A rotating shaft (310) is fixedly installed at the output end of the asynchronous motor (39). A driving gear (311) is fixedly installed on the outer wall of the rotating shaft (310). The driving gear (311) meshes with the driven gear (37). One end of a connecting rod (312) is fixedly installed on the inner wall of the driven gear (37). The other end of the connecting rod (312) is fixedly connected to the center of the side wall of a U-shaped frame (313). A first asynchronous motor (314) is fixedly installed on the outer wall of one end of the U-shaped frame (313). A bidirectional lead screw (315) is fixedly installed at the output end of the first asynchronous motor (314). The bidirectional lead screw (315) is rotatably installed on the U-shaped frame (313). The fixed end of a center hydraulic cylinder (316) is fixedly connected to the center of the inner wall of the U-shaped frame (313). The bidirectional lead screw (315) penetrates through the fixed end of the center hydraulic cylinder (316). The piston end of the center hydraulic cylinder (316) is fixedly connected to the center of the outer wall of one end of an arc-shaped pressing plate (317). A spring piece (318) is fixedly installed on the side wall of the arc-shaped pressing plate (317). There are two groups of spring pieces (318). A flexible sensing substance (319) is fixedly installed between the two groups of spring pieces (318) and the arc-shaped pressing plate (317). The flexible sensing substance (319) is made of a semiconductor metal oxide. Oxygen molecules will be adsorbed on the surface of this semiconductor metal oxide to form oxygen anions. When the combustible gas methane in natural gas contacts its surface, an oxidation-reduction reaction will occur with the oxygen anions, resulting in a change in the electron concentration on the surface of the semiconductor metal oxide, thereby changing the electrical resistance performance of the material and generating an electrical signal. The fixed end of a side hydraulic cylinder (320) is threadedly installed on the bidirectional lead screw (315). The piston end of the side hydraulic cylinder (320) is fixedly installed with an arc-shaped side plate (321). A data processing unit (322) is fixedly installed on the outer wall of the U-shaped frame (313). The flexible sensing substance (319) is connected to the data processing unit (322) through a microcircuit; Auxiliary component (4), an auxiliary component (4) is arranged outside the circular ring plate (36). The auxiliary component (4) includes a wheel frame (41). One end of the U-shaped frame (313) far from the first asynchronous motor (314) is fixedly installed with a wheel frame (41). A roller (42) is rotatably installed inside the wheel frame (41). The roller (42) rolls and fits against the arc-shaped outer wall of the circular ring plate (36). A gas sensor (43) is fixedly installed on the piston end of the side hydraulic cylinder (320). There are two groups of gas sensors (43). One end of a sliding sleeve (44) is fixedly installed on the arc-shaped outer wall of the circular ring plate (36). The other end of the sliding sleeve (44) slides and fits against the arc-shaped outer wall of the bracket (31). There are two groups of sliding sleeves (44); Centering component (5), a centering component (5) is arranged outside the cross plate (34). The centering component (5) includes a transverse hydraulic cylinder (51). The fixed end of the transverse hydraulic cylinder (51) is fixedly installed on the central outer wall of the cross plate (34). The piston end of the transverse hydraulic cylinder (51) is fixedly installed with a fixed frame (52). A second asynchronous motor (53) is fixedly installed on the outer wall of the fixed frame (52). One end of an L-shaped plate (54) is fixedly connected to the outside of the output shaft of the second asynchronous motor (53). A circular frame (55) is fixedly installed at the other end of the L-shaped plate (54). A third asynchronous motor (56) is fixedly installed inside the circular frame (55). A threaded rod (57) is fixedly installed at the output end of the third asynchronous motor (56). A threaded block (58) is threadedly installed on the threaded rod (57). One end of a first hinge rod (59) is hingedly installed on the threaded block (58). The other end of the first hinge rod (59) is hingedly installed on a second hinge rod (510). One end of the second hinge rod (510) is hingedly installed on the circular frame (55). A clamping plate (512) is hingedly installed at the other end of the second hinge rod (510). An auxiliary rod (511) is hingedly installed between the clamping plate (512) and the circular frame (55). A first pressure sensor (513) is fixedly installed inside the end of the clamping plate (512) far from the circular frame (55).

2. The leakage detection device for a natural gas storage tank according to claim 1, wherein: There are two groups of the brackets (31), self-locking universal wheels (32), vertical hydraulic cylinders (33) and vertical rods (35). And the two groups of brackets (31), self-locking universal wheels (32), vertical hydraulic cylinders (33) and vertical rods (35) are mirror-symmetrically arranged at both ends of the cross plate (34) with the vertical center line of the cross plate (34) as the mirror axis.

3. The leakage detection device for a natural gas storage tank according to claim 1, characterized in that: There are two groups of the side hydraulic cylinders (320) and arc-shaped side plates (321). And the two groups of side hydraulic cylinders (320) and arc-shaped side plates (321) are mirror-symmetrically arranged at both ends of the bidirectional lead screw (315) with the vertical center line of the bidirectional lead screw (315) as the mirror axis.

4. A leakage detection device for a natural gas storage tank according to claim 1, characterized in that: The flexible sensing material (319) is in the same vertical plane as the area to be detected of the storage tank body (2), and the flexible sensing material (319) is closely attached to the outside of the area to be detected.

5. The leak detection device for a natural gas storage tank according to claim 1, characterized in that: The first hinge rod (59), the second hinge rod (510), the auxiliary rod (511), the clamping plate (512), and the first pressure sensor (513) are provided in multiple groups, and the multiple groups of the first hinge rod (59), the second hinge rod (510), the auxiliary rod (511), the clamping plate (512), and the first pressure sensor (513) are all circumferentially arrayed at equal intervals with the center of the circular cross-section of the circular frame (55) as the array center. When the top end of the L-shaped plate (54) is kept horizontal, the centers of the circular cross-sections of the circular frame (55) and the circular ring plate (36) are coaxial.

6. The leak detection device for a natural gas storage tank according to claim 5, wherein: A fixing component (6) is provided on the fixing frame (52). The fixing component (6) includes a moving rod (61). The top end of the moving rod (61) is fixedly installed on the outer wall of the fixing frame (52). The bottom end of the moving rod (61) is fixedly installed with an auxiliary ring (62). The centers of the circular cross-sections of the auxiliary ring (62) and the circular ring plate (36) are coaxial. The fixed end of an inclined hydraulic cylinder (63) is fixedly connected to the inside of the arc-shaped side wall of the auxiliary ring (62). The second pressure sensor (64) is fixedly installed inside the piston end of the inclined hydraulic cylinder (63). The inclined hydraulic cylinder (63) and the second pressure sensor (64) are provided in multiple groups.

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