Leakage detection equipment for natural gas storage tank

Abstract

The invention relates to the technical field of leakage detection, and discloses a leakage detection device for a natural gas storage tank, the leakage detection device for the natural gas storage tank comprises a bottom plate, and the top end of the bottom plate is provided with a storage tank body. According to the leakage detection equipment for the natural gas storage tank, in order to better perform leakage detection, the detection assembly is arranged, a detection assembly body is better moved in cooperation with a support and self-locking universal wheels, and a transverse plate, a vertical rod and an annular plate can move up and down in cooperation with a vertical hydraulic cylinder; the device can better perform concentric centering adjustment with storage tank bodies of more sizes, cooperates with a servo slide rail and an asynchronous motor to enable a rotating shaft to drive a driving gear to rotate, cooperates with a driven gear to enable a connecting rod and a U-shaped frame to rotate, starts a central hydraulic cylinder, cooperates with an arc-shaped pressing plate and an elastic sheet to enable a flexible sensing substance to wrap and cling to a to-be-detected area, and is convenient to operate. And whether the data processing unit receives the digital signal value of the flexible sensing substance or not is judged, and natural gas leakage is indicated if the threshold value is exceeded.

Description

Technical Field

[0001] The invention relates to the technical field of leakage detection, in particular to leakage detection equipment for a natural gas storage tank. Background Art

[0002] As the global demand for clean energy continues to grow, natural gas, as a relatively clean and efficient energy source, continues to increase its share in the energy structure. Natural gas storage tanks are key facilities in the storage and transportation of natural gas. Leak detection is the core link to ensure the safe operation of natural gas storage tanks. At present, horizontal storage tanks often use gas sensors to sense trace natural gas leaks. However, some existing leak detection equipment has a single detection method, resulting in inaccurate detection results. It is difficult to conveniently and flexibly implement leak detection for horizontal storage tanks through multiple methods. Some detection equipment may only cover partial areas of the tank.

[0003] For example, transverse welds can be easily inspected, but it is impossible to conduct comprehensive inspections on the surface of the tank, such as annular welds and annular flange connections. This may lead to the omission of some leakage points, increasing safety hazards, and lack of stability, and its practicality needs to be improved. In view of this, we propose a leak detection device for natural gas storage tanks. Summary of the invention

[0004] The object 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 technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A leakage detection device for a natural gas storage tank comprises a bottom plate, a storage tank body is arranged on the top of the bottom plate, a detection component is arranged outside the storage tank body, and the detection component comprises: The bracket is provided at the top of the bottom plate, and the bottom of the bracket is provided with a self-locking universal wheel. The top of the bracket is fixedly connected to the fixed end of the bottom end of the vertical hydraulic cylinder, and the piston end of the top end of the vertical hydraulic cylinder is fixedly installed with a horizontal plate, and the bottom of the horizontal plate is fixedly installed with a vertical rod, and the bottom end of the vertical rod is fixedly installed with a circular plate, and the arc-shaped outer wall of the circular plate is rotatably installed with a driven gear; A servo slide rail, wherein the side wall of the bracket is fixedly mounted with the servo slide rail, the outer wall of the movable block inside the servo slide rail is fixedly mounted with the bottom of the asynchronous motor, the output end of the asynchronous motor is fixedly mounted with a rotating shaft, the outer wall of the rotating shaft is fixedly mounted with a driving gear, the driving gear meshes with a driven gear, one end of a connecting rod is fixedly mounted on the inner wall of the driven gear, and the other end of the connecting rod is fixedly connected to the center of the side wall of the U-shaped frame; A first asynchronous motor, the first asynchronous motor is fixedly installed on the outer wall of one end of the U-shaped frame, a bidirectional screw is fixedly installed on the output end of the first asynchronous motor, the bidirectional screw is rotatably installed on the U-shaped frame, the center of the inner wall of the U-shaped frame is fixedly connected to the fixed end of the central hydraulic cylinder, the bidirectional screw penetrates 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, and a spring is fixedly installed on the side wall of the arc-shaped pressing plate, and the spring is provided in two groups, and a flexible sensing material is fixedly installed between the two groups of springs and the arc-shaped pressing plate, and the flexible sensing material is made of semiconductor metal oxide, the surface of the semiconductor metal oxide will absorb oxygen molecules to form oxygen negative ions, when the combustible gas methane in the natural gas contacts its surface, it will undergo an oxidation-reduction reaction with the oxygen negative ions, resulting in a change in the electron concentration on the surface of the semiconductor, thereby changing the electrical resistance properties of the material and generating an electrical signal; A side hydraulic cylinder, a fixed end of the side hydraulic cylinder is threadedly installed on the bidirectional screw rod, an arc-shaped side plate is fixedly installed on the piston end of the side hydraulic cylinder, a data processing unit is fixedly installed on the outer wall of the U-shaped frame, and the flexible sensing material is connected to the data processing unit through a microcircuit.

[0006] Preferably, the bracket, self-locking universal wheel, vertical hydraulic cylinder and vertical rod are arranged in two groups, and the two groups of the bracket, self-locking universal wheel, vertical hydraulic cylinder and vertical rod are mirrored at both ends of the horizontal plate with the vertical center line of the horizontal plate as the mirror axis, so that the circular ring plate can move up and down more stably.

[0007] Preferably, two groups of side hydraulic cylinders and arc-shaped side plates are provided, and the two groups of side hydraulic cylinders and arc-shaped side plates use the vertical center line of the bidirectional screw as the mirror axis, and the mirror images are arranged at both ends of the bidirectional screw to further clamp the flexible sensing material, so that the sealing of the area to be detected is better.

[0008] 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.

[0009] Preferably, an auxiliary component is arranged outside the circular ring plate, and the auxiliary component includes a wheel frame, and the wheel frame is fixedly installed at one end of the U-shaped frame away from the first asynchronous motor, and a roller is rotatably installed inside the wheel frame, and the roller rolls and fits the arc-shaped outer wall of the circular ring plate.

[0010] Preferably, a gas sensor is fixedly mounted on the piston end of the side hydraulic cylinder, and two groups of the gas sensors are provided to further determine whether there is leakage in the area to be detected, increase the detection method, and make the result more accurate.

[0011] Preferably, one end of a sliding sleeve is fixedly mounted on the arc-shaped outer wall of the circular ring plate, and the other end of the sliding sleeve is slidably fitted on the arc-shaped outer wall of the bracket. Two groups of sliding sleeves are provided, so that the circular ring plate can move up and down more stably.

[0012] Preferably, a centering component is provided on the outside of the transverse plate, and the centering component includes a transverse hydraulic cylinder, a transverse hydraulic cylinder fixed end is fixedly installed on the central outer wall of the transverse plate, a fixing frame is fixedly installed on the piston end of the transverse hydraulic cylinder, a second asynchronous motor is fixedly installed on the outer wall of the fixing frame, an output shaft of the second asynchronous motor is fixedly connected to one end of the L-shaped plate on the outside, a circular frame is fixedly installed on 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 on the output end of the third asynchronous motor, a threaded block is threaded on the threaded rod, one end of a first hinged rod is hingedly installed on the threaded block, the other end of the first hinged rod is hingedly installed on the second hinged rod, one end of the second hinged rod is hingedly installed on the circular frame, a clamping plate is hingedly installed on the other end of the second hinged rod, an auxiliary rod is hingedly installed between the clamping plate and the circular frame, and a first pressure sensor is fixedly installed inside the end of the clamping plate away from the circular frame.

[0013] Preferably, the first hinged rod, the second hinged rod, the auxiliary rod, the splint and the first pressure sensor are provided in multiple groups, and the multiple groups of the first hinged rod, the second hinged rod, the auxiliary rod, the splint and the first pressure sensor are all arranged in a circular array with equal spacing 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, and after initially forming a clamping and fixing effect, they can also assist in the coaxial centering adjustment of the circular ring plate in the detection assembly and the storage tank body.

[0014] Preferably, a fixing component is provided on the fixing frame, and the fixing component includes a moving rod, a top end of the moving rod is fixedly mounted on the outer wall of the fixing frame, an auxiliary ring is fixedly mounted on 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 interior of the arc-shaped side wall of the auxiliary ring is fixedly connected to the fixed end of the oblique hydraulic cylinder, a second pressure sensor is fixedly mounted inside the piston end of the oblique hydraulic cylinder, the oblique hydraulic cylinder and the second pressure sensor are provided in multiple groups, which together form a clamping and fixing effect, and can also assist the circular ring plate in the detection assembly to perform coaxial centering adjustment with the storage tank body.

[0015] Compared with the prior art, the present invention provides a leakage detection device for a natural gas storage tank, which has the following beneficial effects: 1. The leakage detection equipment for natural gas storage tanks, in order to better detect the leakage of the storage tank body, is provided with a detection component, and cooperates with a bracket and a self-locking universal wheel to better move the detection component body, and cooperates with a vertical hydraulic cylinder so that the horizontal plate, the vertical rod and the circular ring plate can move up and down, so that it can better perform coaxial centering adjustment with storage tank bodies of more sizes, cooperates with a servo slide rail and an asynchronous motor so that the rotating shaft drives the driving gear to rotate, and cooperates with the driven gear to rotate the connecting rod and the U-shaped frame, starts the central hydraulic cylinder, cooperates with the arc pressure plate and the spring sheet to make the flexible sensing material wrap and stick to the area to be detected, cooperates with the data processing unit to receive the digital signal value of the flexible sensing material, and if it exceeds the threshold, it indicates that there is a natural gas leak, starts the first asynchronous motor, cooperates with the bidirectional screw rod to make the two sets of side hydraulic cylinders drive the arc side plates to move toward each other, further clamps the flexible sensing material, makes the area to be detected more sealed, and then can better detect the leakage of the storage tank body.

[0016] 2. In order to make the detection process of the detection component more stable, the leakage detection equipment for natural gas storage tanks is provided with an auxiliary component. When the U-shaped frame rotates, it will drive the wheel frame to rotate synchronously, so that the roller can rotate synchronously on the arc-shaped outer wall of the circular ring plate while revolving synchronously, so that the U-shaped frame can rotate more stably. At the same time, with the monitoring of the gas sensor outside the area to be detected, it can further determine whether the area is leaking, increase the detection method, and make the result more accurate. When the circular ring plate moves up and down, it drives the sliding sleeve to slide on the bracket synchronously, thereby making the detection process of the detection component more stable.

[0017] 3. In order to make the detection component better for detection, the leakage detection equipment for natural gas storage tanks is provided with a centering component. When the detection component moves to the target detection area, that is, the arc-shaped pressure plate and the annular weld or flange connection to be detected are in the same vertical plane, the transverse hydraulic cylinder is started to enable the fixing frame to move laterally. When the second asynchronous motor is started, the L-shaped plate can swing vertically. Therefore, when the top of the L-shaped plate is kept in a horizontal state, the centers of the circular cross-sections of the circular frame and the annular plate in the detection component are coaxial. Therefore, the third asynchronous motor is started to rotate the threaded rod, so that the threaded block can move axially along the threaded rod. In cooperation with the first hinged rod, the second hinged rod and the auxiliary rod, multiple groups of clamps can move together to fit tightly against the arc-shaped outer wall of the storage tank body. After the initial clamping and fixing effect is formed, by observing whether multiple groups of first pressure sensors have contact feedback values ​​at the same time, the annular plate in the detection component can also be assisted in the coaxial centering adjustment of the storage tank body.

[0018] 4. In order to make the detection process of the detection component more stable, the leakage detection equipment for natural gas storage tanks is provided with a fixed component. When the detection component moves to the target detection area, that is, the arc-shaped pressure plate and the annular weld or flange connection to be detected are in the same vertical plane, the transverse hydraulic cylinder in the centering component is cooperated to enable the moving rod to move laterally, driving the auxiliary ring to move synchronously. When multiple groups of oblique hydraulic cylinders are started at the same time, the front ends of the piston rods of the multiple groups of oblique hydraulic cylinders simultaneously contact 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 the multiple groups of second pressure sensors have contact feedback values ​​at the same time, the circular ring plate in the detection component and the storage tank body can also be assisted in the coaxial centering adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front plan view of the overall structure of the present invention; Figure 2 It is a schematic top view of the overall structure of the present invention from another viewing angle; Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure of the middle A area; Figure 4 It is a schematic diagram of a top view of the back of the overall structure of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure of the middle B area; Figure 6 For the present invention Figure 4 Schematic diagram of the enlarged structure of the middle C area; Figure 7 It is a schematic cross-sectional view of the storage tank body of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of the middle D area; Fig. 9 For the present invention Figure 7 Schematic diagram of the enlarged structure of the middle E area; Fig.10 It is an exploded view of part of the structure of the present invention; Fig.11 It is a schematic cross-sectional view of the driven gear of the present invention.

[0020] 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, horizontal plate; 35, vertical rod; 36, circular plate; 37, driven gear; 38, servo slide; 39, asynchronous motor; 310, rotating shaft; 311, driving gear; 312, connecting rod; 313, U-shaped frame; 314, first asynchronous motor; 315, two-way screw rod; 316, central hydraulic cylinder; 317, arc pressure plate; 318, spring; 319, flexible sensing material; 320, side hydraulic cylinder; 321, arc side plate; 32 2. Data processing unit; 4. Auxiliary components; 41. Wheel frame; 42. Roller; 43. Gas sensor; 44. Sleeve; 5. Centering component; 51. Transverse hydraulic cylinder; 52. Fixed frame; 53. Second asynchronous motor; 54. L-shaped plate; 55. Round frame; 56. Third asynchronous motor; 57. Threaded rod; 58. Threaded block; 59. First articulated rod; 510. Second articulated rod; 511. Auxiliary rod; 512. Clamp; 513. First pressure sensor; 6. Fixed component; 61. Moving rod; 62. Auxiliary ring; 63. Oblique hydraulic cylinder; 64. Second pressure sensor. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the present application, the orientation or positional relationship indicated by the term "on" is based on the orientation or positional relationship shown in the accompanying drawings. It is mainly for the purpose of better describing the present application and its embodiments, and is not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, the term "on" may also be used to indicate a certain dependency 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 the specific circumstances.

[0023] See also Figure 1 - Fig.11 , the present invention provides a technical solution: A leakage detection device for a natural gas storage tank comprises a bottom plate 1, and a storage tank body 2 is arranged on the top of the bottom plate 1.

[0024] In one embodiment of the present invention, a detection assembly 3 is provided on the outside of the storage tank body 2, and the detection assembly 3 includes a bracket 31, a bracket 31 is provided on the top of the bottom plate 1, a self-locking universal wheel 32 is provided at the bottom of the bracket 31, the top of the bracket 31 is fixedly connected to the fixed end of the bottom end of the vertical hydraulic cylinder 33, a horizontal plate 34 is fixedly installed on the top piston end of the vertical hydraulic cylinder 33, a vertical rod 35 is fixedly installed at the bottom of the horizontal plate 34, and a circular plate 36 is fixedly installed at the bottom of the vertical rod 35. In addition, the bracket 31, the self-locking universal wheel 32, the vertical hydraulic cylinder 33 and the vertical rod 35 are provided in two groups, and the two groups of brackets 31, self-locking universal wheels 32, vertical hydraulic cylinders 33 and vertical rods 35 are all mirrored with the vertical center line of the horizontal plate 34 as the mirror axis, and the mirror images are set at both ends of the horizontal plate 34, so that The circular plate 36 moves up and down more stably, the arc-shaped outer wall of the circular plate 36 is rotatably installed with a driven gear 37, the side wall of the bracket 31 is fixedly installed with a servo slide 38, the outer wall of the inner movable block of the servo slide 38 is fixedly installed with the bottom of the 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, and the inner wall of the driven gear 37 is fixedly installed with one end of a connecting rod 312, and the other end of the connecting rod 312 is fixedly connected to the center of the side wall of a U-shaped frame 313, and the outer wall of one end of the U-shaped frame 313 is fixedly installed with a first asynchronous motor 314, and the output end of the first asynchronous motor 314 is fixedly installed with a bidirectional screw rod 315, and the bidirectional screw rod 315 is rotatably installed on the U-shaped frame The U-shaped frame 313 is on the frame, the center of the inner wall of the U-shaped frame 313 is fixedly connected to the fixed end of the central hydraulic cylinder 316, the bidirectional screw rod 315 passes through the fixed end of the central hydraulic cylinder 316, the piston end of the central hydraulic cylinder 316 is fixedly connected to the center of the outer wall of one end of the arc pressure plate 317, and the side wall of the arc pressure plate 317 is fixedly installed with a spring 318, and the spring 318 is provided with two groups. A flexible sensing material 319 is fixedly installed between the two groups of springs 318 and the arc pressure plate 317. The flexible sensing material 319 is made of semiconductor metal oxide, and the semiconductor metal oxide is zinc oxide or tin dioxide. The surface of the semiconductor metal oxide can absorb oxygen molecules to form oxygen negative ions. When the combustible gas methane in the natural gas contacts its surface, it will undergo an oxidation-reduction reaction with the oxygen negative ions, leading to The electron concentration on the surface of the semiconductor changes, thereby changing the electrical resistance properties of the material and generating an electrical signal. The fixed end of the side hydraulic cylinder 320 is threadedly installed on the bidirectional screw rod 315, and the piston end of the side hydraulic cylinder 320 is fixedly installed with an arc-shaped side plate 321. The outer wall of the U-shaped frame 313 is fixedly installed with a data processing unit 322. The flexible sensing material 319 is connected to the data processing unit 322 through a microcircuit. In addition, two groups of side hydraulic cylinders 320 and arc-shaped side plates 321 are provided, and the two groups of side hydraulic cylinders 320 and arc-shaped side plates 321 are mirrored with the vertical center line of the bidirectional screw rod 315. The mirror images are set at both ends of the bidirectional screw rod 315, and the flexible sensing material 319 is further clamped, so that the sealing of the area to be detected is better. In addition,The flexible sensing material 319 and the area to be detected of the storage tank body 2 are in the same vertical plane, and the flexible sensing material 319 is close to the outside of the area to be detected.

[0025] When the present embodiment is used, the staff 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, and then starts the vertical hydraulic cylinder 33. The piston end of the vertical hydraulic cylinder 33 drives the horizontal plate 34 fixedly connected thereto to move up and down. The movement of the horizontal plate 34 causes the vertical rod 35 and the circular ring plate 36 to move up and down synchronously, thereby adapting to storage tank bodies 2 with more outer diameter sizes and more different heights above the ground, and preparing for subsequent detection work. If the driven gear 37 moves up and down with 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 interfering with the up and down movement of the circular ring plate 36, it is necessary to adjust the servo slide rail 38 so that the driving gear 311 is first disengaged from the meshing with the driven gear 37; When the servo slide 38 is started, the asynchronous motor 39 will move laterally synchronously with the movable block inside the servo slide 38, and then the asynchronous motor 39 is started, the shaft 310 starts to rotate, driving the driving gear 311 to rotate. When the driving gear 311 is meshed 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 pressure plate 317 to approach the to-be-detected area of ​​the storage tank body 2. Since the side wall of the arc pressure plate 317 is fixedly installed with springs 318, the two groups of springs 318 are elastic. The movement of the arc pressure plate 317 will drive the springs 318 and the flexible sensing material 319 to approach the to-be-detected area together, and finally make the flexible sensing material 319 tightly wrap and cling to the to-be-detected area. The flexible sensing material 319 is made of semiconductor metal oxide, such as zinc oxide or tin dioxide. This semiconductor metal The oxide surface will absorb oxygen molecules to form oxygen anions. When the combustible gas methane in the natural gas contacts its surface, it will undergo an oxidation-reduction reaction with the oxygen anions, causing the electron concentration on the semiconductor surface to change, thereby changing the electrical resistance of the material, and then generating an electrical signal. The generated electrical signal is transmitted to the data processing unit 322 through the microcircuit. After receiving the digital signal, the data processing unit 322 will compare it with a preset threshold value. This threshold value is determined based on the electrical signal generated by the chemical sensing material under the normal environment of natural gas and possible interference signals. If the received digital signal value exceeds the threshold value, it indicates that there is a natural gas leak. When the flexible sensing material 319 starts to detect, the first asynchronous motor 314 is started. The output end of the first asynchronous motor 314 drives the bidirectional screw 315 to rotate. When the bidirectional screw 315 rotates, the two sets of side hydraulic cylinders 320 will drive the arc side plates 321 to move closer to each other, further clamping the flexible sensing material 319, so that the sealing of the area to be detected is better, which helps to improve the accuracy of the detection.

[0026] In one embodiment of the present invention, an auxiliary component 4 is provided on the outside of the circular ring plate 36, and the auxiliary component 4 includes a wheel frame 41. The wheel frame 41 is fixedly installed at one end of the U-shaped frame 313 away from the first asynchronous motor 314, and a roller 42 is rotatably installed inside the wheel frame 41, and the roller 42 rolls and fits against 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, and two groups of gas sensors 43 are provided to further determine whether there is a leak in the area to be detected, increase the detection method, and make the result 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 against the arc-shaped outer wall of the bracket 31. Two groups of sliding sleeves 44 are provided, so that the circular ring plate 36 moves up and down more stably.

[0027] When the present embodiment is used, when the U-shaped frame 313 rotates, the wheel frame 41 will be driven 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 combination of revolution and rotation can effectively balance the centrifugal force and torque generated when the U-shaped frame 313 rotates, thereby making the U-shaped frame 313 rotate more stably, thereby ensuring 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 bracket 31, and the sliding of the sliding sleeve 44 can be used for the up and down movement of the circular ring plate 36. The movement provides a stable guiding effect to prevent the annular plate 36 from shifting or shaking during the up and down movement, so that the position of the detection component 3 during the detection process is more stable, which helps to improve the accuracy of the detection results. 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 a leak in the 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 increasing the detection methods, the detection results are more accurate and reliable. It is worth noting that the gas sensor 43 is an existing device of the prior art, and its working principle will not be repeated here.

[0028] In one embodiment of the present invention, a centering assembly 5 is provided on the outside of the transverse plate 34, and the centering assembly 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 transverse plate 34, and a fixing frame 52 is fixedly installed on the piston end of the transverse hydraulic cylinder 51. A second asynchronous motor 53 is fixedly installed on the outer wall of the fixing frame 52. The output shaft of the second asynchronous motor 53 is fixedly connected to one end of the L-shaped plate 54 on the outside, and a circular frame 55 is fixedly installed on the other end of the L-shaped plate 54. A third asynchronous motor 56 is fixedly installed inside the circular frame 55, and a threaded rod 57 is fixedly installed on the output end of the third asynchronous motor 56. A threaded block 58 is threadedly installed on the threaded rod 57, and one end of a first hinged rod 59 is hingedly installed on the threaded block 58. The other end of the first hinged rod 59 is hingedly installed on the second hinged rod 510, and one end of the second hinged rod 510 is hingedly installed on the circular frame 55. A splint 512 is hingedly installed at the other end of the rod 510, and an auxiliary rod 511 is hingedly installed between the splint 512 and the circular frame 55. A first pressure sensor 513 is fixedly installed inside the end of the splint 512 away from the circular frame 55. In addition, four groups of the first hinged rod 59, the second hinged rod 510, the auxiliary rod 511, the splint 512 and the first pressure sensor 513 are arranged, and the four groups of the first hinged rod 59, the second hinged rod 510, the auxiliary rod 511, the splint 512 and the first pressure sensor 513 are all arranged in a circular array with equal spacing around the center of the circular cross section of the circular frame 55 as the center of the array. 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 the initial clamping and fixing effect is formed, the annular plate 36 in the auxiliary detection component 3 can also be coaxially adjusted with the storage tank body 2.

[0029] When this embodiment is used, when the detection component 3 moves to the target detection area, that is, the arc-shaped pressure 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, and 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, and 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 maintain a horizontal state, the centers of the circular cross-sections of the circular frame 55 and the annular plate 36 are coaxial. Then, the third asynchronous motor 56 is started, and 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 hinged rod 59 hingedly installed therewith to move synchronously. The movement of the first hinged rod 59 will prompt the second hinged rod 510 to rotate around the hinge point between it and the circular frame 55. At the same time, the auxiliary rod 511 plays a supporting and guiding role, so that the multiple groups of splints 512 are close to and tightly attached to the curved outer wall of the storage tank body 2 to form a preliminary fixing effect. In this process, it is necessary to cooperate with the controller to continuously observe the value changes of the multiple groups of first pressure sensors 513. The staff continuously fine-tunes the position of the annular plate 36 by moving the bracket 31 and adjusting the height of the horizontal plate 34 from the ground again, until the multiple groups of first pressure sensors 513 have contact feedback values ​​at the same time, which indicates that the center of the circular cross section between the annular plate 36 and the storage tank body 2 has been made coaxial.

[0030] In one embodiment of the present invention, a fixing assembly 6 is provided on the fixing frame 52, and the fixing assembly 6 includes a moving rod 61. The top of the moving rod 61 is fixedly installed on the outer wall of the fixing frame 52, and 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 annular plate 36 are coaxial. The interior of the arc-shaped side wall of the auxiliary ring 62 is fixedly connected to the fixed end of the oblique hydraulic cylinder 63, and the interior of the piston end of the oblique hydraulic cylinder 63 is fixedly installed with a second pressure sensor 64. The oblique hydraulic cylinder 63 and the second pressure sensor 64 are provided with three groups, and the three groups of oblique hydraulic cylinders 63 and the second pressure sensors 64 are all arranged in a circular array with equal spacing with the center of the circular cross-section of the auxiliary ring 62 as the array center, so as to form a clamping and fixing effect together, and can also assist in the coaxial centering adjustment of the annular plate 36 in the detection assembly 3 and the storage tank body 2.

[0031] When the present embodiment is used, after the detection component 3 reaches the target detection area, with the help of the movement of the horizontal hydraulic cylinder 51 in the centering component 5, the moving rod 61 connected thereto will move synchronously with the fixing frame 52, and the auxiliary ring 62 will also move synchronously. At this time, the multiple groups of oblique hydraulic cylinders 63 are started, and the front ends of the piston ends of the oblique hydraulic cylinders 63 can simultaneously resist the arc-shaped outer wall of the storage tank body 2, thereby jointly forming a clamping and fixing effect. In this process, the staff observes the values ​​of the multiple groups of second pressure sensors 64, adjusts the position of the annular plate 36 by moving the bracket 31 and adjusting the height of the horizontal plate 34 from the ground again, and when the multiple groups of second pressure sensors 6 When there is a contact feedback value, it means that the center of the circular cross section between the annular plate 36 and the storage tank body 2 has been coaxially centered. If there are other protruding pipes and other equipment blocking one end of the storage tank body 2, the circular frame 55 in the centering component 5 may come into contact with 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 opposite direction, and then drives the circular frame 55 to swing upward to avoid the obstruction. In this case, only the fixing component 6 is relied on for centering adjustment. Repeat the above-mentioned operation steps of the fixing component 6 until the coaxial centering of the annular plate 36 and the storage tank body 2 is achieved.

[0032] Among them, the electrical components appearing in this application document are all electrically connected to the controller with its own display screen and 220V AC power or its own power supply, and the controller is a conventional known device that can control the vertical hydraulic cylinder 33, servo slide 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, transverse hydraulic cylinder 51, second asynchronous motor 53, third asynchronous motor 56, first pressure sensor 513, oblique hydraulic cylinder 63 and second pressure sensor 64. The standard parts used in this application document can all be purchased from the market, and the specific connection methods of each part are connected by conventional means such as mature rivets and welding in the prior art, and the machinery, parts and equipment are all conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0033] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A leakage detection device for a natural gas storage tank, comprising a base plate (1), a storage tank body (2) being arranged on the top of the base plate (1), characterized in that: A detection component (3) is arranged outside the storage tank body (2), and the detection component (3) comprises: A bracket (31), the top of the bottom plate (1) is provided with a bracket (31), the bottom of the bracket (31) is provided with a self-locking universal wheel (32), the top of the bracket (31) is fixedly connected to the bottom fixed end of a vertical hydraulic cylinder (33), the top piston end of the vertical hydraulic cylinder (33) is fixedly mounted with a horizontal plate (34), the bottom of the horizontal plate (34) is fixedly mounted with a vertical rod (35), the bottom of the vertical rod (35) is fixedly mounted with a circular plate (36), and the arc-shaped outer wall of the circular plate (36) is rotatably mounted with a driven gear (37); A servo slide rail (38), the side wall of the bracket (31) is fixedly mounted with the servo slide rail (38), the outer wall of the internal movable block of the servo slide rail (38) is fixedly mounted with the bottom of an asynchronous motor (39), a rotating shaft (310) is fixedly mounted on the output end of the asynchronous motor (39), a driving gear (311) is fixedly mounted on the outer wall of the rotating shaft (310), the driving gear (311) meshes with a driven gear (37), one end of a connecting rod (312) is fixedly mounted on the inner wall of the driven gear (37), and the other end of the connecting rod (312) is fixedly connected to the center of the side wall of the U-shaped frame (313); A first asynchronous motor (314) is fixedly mounted on the outer wall of one end of the U-shaped frame (313); a bidirectional screw rod (315) is fixedly mounted on the output end of the first asynchronous motor (314); the bidirectional screw rod (315) is rotatably mounted on the U-shaped frame (313); the center of the inner wall of the U-shaped frame (313) is fixedly connected to the fixed end of the central hydraulic cylinder (316); the bidirectional screw rod (315) passes through the fixed end of the central hydraulic cylinder (316); the piston end of the central hydraulic cylinder (316) is fixedly connected to the center of the outer wall of one end of the arc-shaped pressure plate (317); the arc-shaped pressure plate (317) is fixedly mounted on the output end of the U-shaped frame (314); the bidirectional screw rod (315) is fixedly connected to the fixed end of the central hydraulic cylinder (316); the piston end of the central hydraulic cylinder (316) is fixedly connected to the center of the outer wall of one end of the arc-shaped pressure plate (317); the arc-shaped pressure plate (317) is fixedly connected to ... inner wall of the U-shaped frame (313); the bidirectional screw rod (315) is fixedly connected to the inner wall of the U-shaped frame (313); the bidirectional screw rod (315) is fixedly connected to the inner wall of the U-shaped frame (313); the bidirectional screw rod (315) is fixedly connected to the inner wall of the U-shaped frame (313); the bidirectional screw rod (315) A spring sheet (318) is fixedly mounted on the side wall of the pressing plate (317), wherein two groups of the spring sheets (318) are provided, and a flexible sensing material (319) is fixedly mounted between the two groups of spring sheets (318) and the arc-shaped pressing plate (317), wherein the flexible sensing material (319) is made of a semiconductor metal oxide, and the surface of the semiconductor metal oxide can adsorb oxygen molecules to form oxygen negative ions. When the combustible gas methane in the natural gas contacts the surface, it will undergo an oxidation-reduction reaction with the oxygen negative ions, causing the electron concentration on the semiconductor surface to change, thereby changing the electrical resistance properties of the material and generating an electrical signal; A side hydraulic cylinder (320), a fixed end of the side hydraulic cylinder (320) being threadedly mounted on the bidirectional screw rod (315), an arc-shaped side plate (321) being fixedly mounted on the piston end of the side hydraulic cylinder (320), a data processing unit (322) being fixedly mounted on the outer wall of the U-shaped frame (313), and the flexible sensing material (319) being connected to the data processing unit (322) via a microcircuit.

2. A leak detection device for a natural gas storage tank according to claim 1, characterized in that: The bracket (31), the self-locking universal wheel (32), the vertical hydraulic cylinder (33) and the vertical rod (35) are provided in two groups, and the two groups of the bracket (31), the self-locking universal wheel (32), the vertical hydraulic cylinder (33) and the vertical rod (35) are both mirrored at both ends of the horizontal plate (34) with the vertical center line of the horizontal plate (34) as the mirror axis.

3. A leak detection device for a natural gas storage tank according to claim 1, characterized in that: Two groups of the side hydraulic cylinders (320) and the arc-shaped side plates (321) are provided, and the two groups of the side hydraulic cylinders (320) and the arc-shaped side plates (321) are mirrored at both ends of the bidirectional screw rod (315) with the vertical center line of the bidirectional screw rod (315) as the mirror axis.

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

5. The leakage detection device for a natural gas storage tank according to claim 1, characterized in that: An auxiliary component (4) is arranged outside the circular ring plate (36), and the auxiliary component (4) comprises a wheel frame (41). The wheel frame (41) is fixedly mounted on one end of the U-shaped frame (313) away from the first asynchronous motor (314), and a roller (42) is rotatably mounted inside the wheel frame (41), and the roller (42) rolls and fits against the arc-shaped outer wall of the circular ring plate (36).

6. A leak detection device for a natural gas storage tank according to claim 5, characterized in that: A gas sensor (43) is fixedly mounted on the piston end of the side hydraulic cylinder (320), and two groups of the gas sensors (43) are provided.

7. A leak detection device for a natural gas storage tank according to claim 5, characterized in that: One end of a sliding sleeve (44) is fixedly mounted on the arc-shaped outer wall of the annular plate (36), and the other end of the sliding sleeve (44) is slidably fitted on the arc-shaped outer wall of the bracket (31). Two groups of the sliding sleeves (44) are provided.

8. The natural gas storage tank leakage detection device according to claim 1, characterized in that: A centering assembly (5) is arranged outside the transverse plate (34), and the centering assembly (5) comprises a transverse hydraulic cylinder (51). A fixed end of the transverse hydraulic cylinder (51) is fixedly mounted on the central outer wall of the transverse plate (34), a fixed frame (52) is fixedly mounted on the piston end of the transverse hydraulic cylinder (51), a second asynchronous motor (53) is fixedly mounted on the outer wall of the fixed frame (52), an output shaft of the second asynchronous motor (53) is externally fixedly connected to one end of the L-shaped plate (54), a circular frame (55) is fixedly mounted on the other end of the L-shaped plate (54), a third asynchronous motor (56) is fixedly mounted inside the circular frame (55), and an output shaft of the third asynchronous motor (56) is fixedly mounted on the output shaft of the third asynchronous motor (56). A threaded rod (57) is fixedly mounted on one end of the circular frame (55), a threaded block (58) is threadedly mounted on the threaded rod (57), one end of a first hinged rod (59) is hingedly mounted on the threaded block (58), the other end of the first hinged rod (59) is hingedly mounted on a second hinged rod (510), one end of the second hinged rod (510) is hingedly mounted on a circular frame (55), a clamping plate (512) is hingedly mounted on the other end of the second hinged rod (510), an auxiliary rod (511) is hingedly mounted between the clamping plate (512) and the circular frame (55), and a first pressure sensor (513) is fixedly mounted inside one end of the clamping plate (512) away from the circular frame (55).

9. A leak detection device for a natural gas storage tank according to claim 8, characterized in that: The first hinged rod (59), the second hinged rod (510), the auxiliary rod (511), the clamping plate (512) and the first pressure sensor (513) are provided in a plurality of groups, and the plurality of groups of the first hinged rod (59), the second hinged rod (510), the auxiliary rod (511), the clamping plate (512) and the first pressure sensor (513) are arranged in a circular array with equal spacing around the center of the circular cross section of the circular frame (55) as the center of the array, 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.

10. A leak detection device for a natural gas storage tank according to claim 9, characterized in that: A fixing assembly (6) is arranged on the fixing frame (52), and the fixing assembly (6) comprises a moving rod (61). The top end of the moving rod (61) is fixedly mounted on the outer wall of the fixing frame (52), and the bottom end of the moving rod (61) is fixedly mounted 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 interior of the arc-shaped side wall of the auxiliary ring (62) is fixedly connected to the fixed end of the oblique hydraulic cylinder (63). The interior of the piston end of the oblique hydraulic cylinder (63) is fixedly mounted with a second pressure sensor (64). The oblique hydraulic cylinder (63) and the second pressure sensor (64) are provided in multiple groups.

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