A gas meter leak detection device

Abstract

The application discloses a gas meter leak detection device, which comprises a detection frame, a water cylinder assembly installed on the detection frame through a first lifting mechanism, a gas meter leak detection station distributed above the water cylinder assembly, and a leak detection tool assembly installed on the leak detection station; a clamping mechanism and a pressure charging and plugging mechanism are arranged on the leak detection tool assembly, the pressure charging and plugging mechanism comprises a pressure charging pipeline and a pressure charging and plugging pressure rod connected to the pressure charging pipeline, and the pressure charging and plugging pressure rod is assembled on the leak detection tool assembly through a second lifting mechanism; after the gas meter is fixed and clamped on the clamping mechanism, the plugging and inflating pressure rod can be downwardly inserted on a joint of the gas meter under the driving control of the second lifting mechanism, and the pressure charging pipeline is kept in communication with the joint; after the pressure charging and plugging pressure rod is inserted on the joint of the gas meter, the water cylinder assembly can be moved upwardly under the driving control of the first lifting mechanism, and the gas meter is immersed in the water cylinder assembly. The whole device is reliable in operation, convenient to operate, high in detection precision and strong in practicality.

Description

Technical Field

[0001] This invention relates to the field of leak detection device technology, and specifically to a gas meter leak detection device. Background Technology

[0002] As a core metering instrument in urban gas supply systems, diaphragm gas meters directly impact the accuracy of residential energy supply and the precision of business transactions. The inner casing of the gas meter, as its core sealed cavity, directly determines the metering accuracy and explosion-proof safety performance. Defects in the sealing of the inner casing can lead to anything from inaccurate metering and gas leaks to serious explosions, causing significant property damage and personal injury. Therefore, airtightness testing of the inner casing of diaphragm gas meters is a crucial quality control point that cannot be overlooked in the production process.

[0003] Currently, leak detection devices for gas meter inner boxes mostly rely on manual static testing or use relatively simple single-station testing equipment, which suffers from drawbacks such as low testing efficiency, high labor intensity, and reliance on manual experience for accuracy. A Chinese patent with patent number CN112834126B describes a fully automatic leak detection device for diaphragm-type gas meter inner boxes. This solution places the gas meter inner box on a fixed support plate, simultaneously clamps it with a bidirectional screw, seals it with a movable cover plate, and directly pressurizes the sealed cavity with air by a booster pump. Then, a hydraulic rod lifts a water tank, immersing the workpiece in water to complete the airtightness test. After testing, the process is completed by hot air drying. While this solution achieves multi-station simultaneous testing and improves testing efficiency to some extent, it still has some insurmountable technical shortcomings:

[0004] First, the existing gas meter leak detection device uses a cover-type planar sealing structure, where the sealing reliability depends on the performance of the sealing components. Long-term use can lead to aging and wear, and the separation of the inflation channel from the sealing structure results in low integration and increases the risk of gas leakage. Second, it relies solely on a booster pump for direct gas supply, lacking segmented gas path control and pressure-holding structures. Pressure fluctuations during inflation can affect detection accuracy, and precise control of the inflation-pressure-holding-exhaust sequence is impossible, leading to risks of missed or false detections. Third, the workpiece is fixed to the support plate throughout the process, making it difficult to observe leaks at the bottom of the gas meter. Fourth, the fixed workpiece cannot rotate, requiring observation at multiple different points. Therefore, an improved gas meter leak detection device is proposed. Summary of the Invention

[0005] To address the above technical problems, this invention provides a gas meter leak detection device that can significantly improve detection efficiency, sealing reliability, and automation level.

[0006] The technical solution is as follows:

[0007] A gas meter leak detection device includes a detection frame, the key feature of which is that a water cylinder assembly is installed on the detection frame by a first lifting mechanism, and gas meter leak detection stations are distributed above the water cylinder assembly, with a leak detection fixture assembly installed at each leak detection station.

[0008] The leak detection fixture assembly is equipped with a clamping mechanism and a pressurizing and sealing mechanism. The clamping mechanism is used to fix and hold the gas meter to be tested. The pressurizing and sealing mechanism includes a pressurizing pipe and a pressurizing and sealing rod connected to the pressurizing pipe. The pressurizing and sealing rod is mounted on the upper part of the leak detection fixture assembly and can be moved up and down through a second lifting mechanism. When the gas meter to be tested is fixedly clamped on the clamping mechanism, under the drive control of the second lifting mechanism, the sealing and pressing rod can be inserted downward into the connector of the gas meter and keep the pressurizing pipe connected to the connector.

[0009] After the pressurizing and sealing rod is inserted into the gas meter's connector, the water cylinder assembly moves upward under the drive and control of the first lifting mechanism, immersing the gas meter in the water cylinder assembly. With this structure, the multiple functions distributed on the testing frame can achieve batch synchronous testing, resulting in higher testing efficiency. Its leak detection fixture assembly clamps and fixes the gas meter through a clamping mechanism, and then uses the pressurizing and sealing mechanism to achieve pressurization and sealing functions. Combined with the liftable water cylinder assembly, it completes immersion leak detection, forming a continuous testing process of clamping-sealing-pressurizing-pressure holding-testing, effectively improving the accuracy and practicality of gas meter sealing testing.

[0010] Preferably, the leak detection fixture assembly further includes a base frame, which includes a mounting cross plate and mounting side plates. A support is provided at the lower part of the two opposite mounting side plates, and the clamping mechanism is disposed in the support.

[0011] The inner sidewalls of the two opposing supports are provided with sliding grooves. The clamping mechanism includes a first positioning plate and a second positioning plate, both of which are slidably installed in the sliding grooves, and a clamping cylinder for driving the first positioning plate and the second positioning plate to move closer or further apart from each other.

[0012] Each of the first and second positioning plates is equipped with a clamping component positioned directly opposite each other. The inner side of each clamping component has a semi-circular groove. Driven by the clamping cylinder, the semi-circular grooves of the two clamping components can close and fix the gas meter connector. With this structure, the clamping mechanism is mounted on the base frame, and the clamping cylinder and sliding groove allow the two positioning plates to move closer or further apart, thereby clamping and fixing the gas meter connector. When both plates are pushed to their furthest points, the gas meter connector is ensured to enter the clamping space, improving installation reliability and stability.

[0013] Preferably, the lower inner wall of the semi-circular groove is provided with an internal thread structure. With this structure, the internal thread structure is compatible with the external thread structure of the connector, providing sufficient longitudinal support and ensuring a tight connection.

[0014] Preferably, the second lifting mechanism includes a sealing block that can be slidably mounted between two mounting side plates, and a second lifting cylinder that drives the sealing block to move up and down. The pressurizing sealing rod is fixedly mounted on the sealing block. With this structure, the second lifting mechanism drives the sealing block to move up and down, which in turn drives the pressurizing sealing rod to move up and down, thereby achieving accurate and reliable connection between the pressurizing sealing rod and the gas meter interface, ensuring sealing effect and detection stability.

[0015] Preferably, the pressurized sealing rod includes a vertical rod and a sealing rubber fixedly installed at the lower end of the vertical rod. The vertical rod has a first through hole that extends axially, and the sealing rubber has a second through hole that extends along its height direction. The first through hole and the second through hole are connected, and the pressurized pipe is connected to the upper end of the first through hole.

[0016] After the gas meter connector is fixedly clamped between the internal threaded structures of the two clamping components, the sealing rubber can extend downward into the space enclosed by the two clamping components under the driving action of the second lifting mechanism, and abut against the upper end of the connector. With this structure, after the pressurized sealing rod extends into the clamping mechanism, it seals the connector, ensuring a sealing effect. After sealing, pressure is injected into the gas meter through the through hole, forming a stable, closed pressure-bearing cavity inside the gas meter, which then cooperates with the water tank assembly for sealing testing.

[0017] Preferably, a gas storage tank assembly is also installed inside the testing frame. A first solenoid valve is installed on this assembly, and a second solenoid valve is correspondingly installed at the top of the testing frame near the crossbeam. A first pipe connects the outlet of the first solenoid valve to the inlet of the second solenoid valve. The outlet of the second solenoid valve connects to a pressurization pipe, which is connected to the gas meter via a gas passage on the pressurization sealing rod. With this structure, a segmented gas path is formed by the gas storage tank assembly, the first solenoid valve, the first pipe, the second solenoid valve, and the pressurization pipe, allowing for stable gas filling into the gas meter. After filling, the simultaneous closing of the two solenoid valves ensures reliable pressure maintenance, creating a closed pressure-bearing chamber inside the gas meter. This prevents missed or false detections caused by pressure fluctuations or continuous gas replenishment, significantly improving the accuracy and reliability of the sealing test.

[0018] Preferably, the leak detection fixture assembly further includes a support assembly, the third lifting mechanism of which is mounted on the support, and a support plate is provided below the third lifting mechanism. The support plate and the third lifting mechanism are connected by a workpiece lifting rod. With this structure, the workpiece lifting rod is driven up and down by the third lifting mechanism, which in turn moves the support plate, thus achieving lifting control of the gas meter.

[0019] Preferably, at least four "L"-shaped workpiece positioning blocks are also arranged on the base plate, with the workpiece positioning blocks located on the left, right, and rear sides of the gas meter, respectively. With this structure, the gas meter can be quickly placed in the corresponding position using the workpiece positioning blocks, and then aligned and clamped with the clamping mechanism in subsequent steps.

[0020] Preferably, a cylinder rotation shaft is provided at the end of the second lifting mechanism away from the sealing block, and the cylinder rotation shaft is connected to the crossbeam of the testing frame through a rotating bearing. With the above structure, the rotation of the testing fixture assembly can be achieved through the cylinder rotation shaft and the rotating bearing, thereby allowing observation of leakage in different parts.

[0021] Preferably, the water tank assembly includes two water tanks arranged side by side, with a first lifting mechanism located below each tank. The first lifting mechanism is fixed to a support beam in the middle of the testing frame, and linear guide shafts are provided on both sides of the first lifting mechanism. The water tanks move up and down under the drive of the first lifting mechanism. This structure, with the two water tanks arranged side by side, enables simultaneous immersion testing at multiple stations, resulting in higher testing efficiency. The first lifting mechanism drives the water tanks to rise and fall, and, in conjunction with the linear guide shafts on both sides, guides the water tanks, ensuring smooth and stable movement without deviation, and uniform immersion depth. This guarantees that the gas meter is completely immersed in water during testing and smoothly returns to its original position after testing, ensuring stable and reliable overall operation and effectively improving testing consistency and equipment lifespan.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: The overall structure of this solution is reasonable, and multiple gas meters can be detected simultaneously through multi-station settings, which greatly improves the detection efficiency; the leak detection fixture assembly uses a lifting mechanism to drive the workpiece to lift, and works with a clamping mechanism to clamp and fix the gas meter; the pressurization and sealing mechanism integrates pressurization and sealing functions, and works with dual solenoid valves for segmented gas path control to achieve stable gas filling and reliable pressure maintenance, reduce pressure fluctuation interference, and improve detection accuracy;

[0023] The leak detection fixture assembly works in conjunction with the lifting water cylinder assembly to stably complete the immersion leak detection action, effectively ensuring the metering accuracy and reliability of the gas meter; the overall operation is reliable and convenient, and it has the characteristics of high detection accuracy, good stability and high degree of automation, making it highly practical. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure for removing partial obstruction according to the present invention;

[0026] Figure 3 A schematic diagram of the structure of the inspection tooling assembly 3;

[0027] Figure 4 A schematic diagram for testing tooling assembly 3 and gas meter 4;

[0028] Figure 5 for Figure 4 Internal structure diagram;

[0029] Figure 6 for Figure 5 Enlarged diagram of A in the middle;

[0030] Figure 7 Schematic diagram of the tooling assembly 3 and pressurization pipeline 7 for testing;

[0031] Figure 8 This is a schematic diagram of the structure of water tank assembly 2. Detailed Implementation

[0032] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0033] like Figures 1 to 3 As shown, a gas meter leak detection device includes a detection frame 1. A water cylinder assembly 2 is mounted on the detection frame 1 by a first lifting mechanism 202. Gas meter leak detection stations are distributed above the water cylinder assembly 2, and a leak detection fixture assembly 3 is installed at each leak detection station.

[0034] The leak detection fixture assembly 3 is equipped with a clamping mechanism 302 and a pressurizing and sealing mechanism 301. The clamping mechanism 302 is used to fix and clamp the gas meter 4 to be tested. The pressurizing and sealing mechanism 301 includes a pressurizing pipe 7 and a pressurizing and sealing rod 301a connected to the pressurizing pipe 7. The pressurizing and sealing rod 301a is mounted on the upper part of the leak detection fixture assembly 3 via a second lifting mechanism 301b. When the gas meter 4 to be tested is fixedly clamped on the clamping mechanism 302, under the drive control of the second lifting mechanism 302b, the sealing and pressing rod 301a can be inserted downward into the connector 401 of the gas meter 4, and the pressurizing pipe 7 and the connector 401 are kept in communication.

[0035] When the pressurizing and sealing rod 301a is inserted into the connector of the gas meter 4, the water cylinder assembly 2 can move upward under the drive control of the first lifting mechanism 202, and the gas meter 4 is submerged in the water cylinder assembly 2.

[0036] The leak detection device comprises six leak detection tooling assemblies 3 arranged in parallel to achieve batch synchronous detection and higher detection efficiency. The clamping mechanism 302 can clamp and fix the gas meter 4, while the pressurizing and sealing mechanism 301 is connected to the pressurizing pipeline 7, integrating sealing and pressurizing functions. It has a compact structure and fewer gas leakage points. Together with the lifting water cylinder assembly 2, it completes immersion leak detection, effectively improving the accuracy and practicality of the gas meter 4's sealing detection.

[0037] like Figures 3 to 7 As shown, the leak detection tooling assembly 3 also includes a base frame 304, which includes a mounting horizontal plate 304a and mounting side plates 304b. A support 304c is provided at the lower part of the two opposite mounting side plates 304b, and the clamping mechanism 302 is disposed in the support 304c.

[0038] The inner sidewalls of the two opposing supports 304c are provided with sliding grooves. The clamping mechanism 302 includes a first positioning plate 302b and a second positioning plate 302c, both of which are slidably installed in the sliding grooves, and a clamping cylinder 302a for driving the first positioning plate 302b and the second positioning plate 302c to move closer or further away from each other. The sliding grooves can effectively limit the position of the positioning plates and prevent deviation during movement.

[0039] Each of the first positioning plate 302b and the second positioning plate 302c is equipped with a clamping component 302d at a position directly opposite each other. The inner side of each clamping component 302d has a semi-circular groove 302d1. Driven by the clamping cylinder 302a, the semi-circular grooves 302d1 of the two clamping components 302d can close and clamp the connector 401 of the gas meter 4. When the cylinder rod of the clamping cylinder 302a extends outward, pushing the two positioning plates to their farthest opposite ends of the sliding groove, the connector 401 of the gas meter 4 then enters the clamping space formed by the two semi-circular grooves 302d1. The cylinder rod of the clamping cylinder 302a then retracts inward, clamping and fixing the connector 401 onto the two clamping components 302d. When both plates are pushed to their farthest ends, it ensures that the connector 401 of the gas meter 4 enters the clamping space, improving installation reliability and stability.

[0040] The first positioning plate 302b and the second positioning plate 302c are provided with semi-circular notches at the positions corresponding to the clamping component 302d. A protruding connecting platform is provided in the middle of the outer wall of the clamping component 302d. The first positioning plate 302b and the second positioning plate 302c are connected to the clamping component 302d through the connecting platform. The upper part of the connecting platform is designed to fit inside the semi-circular notch on the positioning plate, and its lower part is constricted. An internal thread structure is provided on the lower inner wall of the semi-circular groove 302d1 of the clamping component 302d.

[0041] The clamping component 302d is fundamentally connected and supported by the central connecting platform and the positioning plate. Simultaneously, it works in conjunction with the upper fitting design and the lower contraction design. The upper fitting design forms a top limit, creating a rigid constraint of "double support" with the central connecting platform. This completely solves the problems of cantilever sway and stress concentration caused by a single central connection, effectively limiting the radial movement and circumferential warping of the clamping component 302d. This ensures that the clamping component 302d and the connector 401 of the gas meter 4 always maintain high coaxiality, avoiding thread misalignment and sealing failure caused by eccentricity. The lower contraction design precisely adapts to the shape of the gas meter connector, and together with the internal thread structure of the semi-circular groove 302d1, it achieves thread engagement and locking with the connector 401, forming a uniform radial clamping force. It also plays an automatic centering guiding role, improving clamping efficiency and locking stability. The three components work together to significantly improve the overall rigidity and long-term reliability of the clamping mechanism 302, while ensuring that the gas meter 4 is firmly clamped. This provides a stable and reliable foundation for subsequent gas filling and pressure holding, rotation and water immersion leak detection, effectively avoiding problems such as workpiece loosening during the testing process, and significantly improving the accuracy of the gas meter 4 sealing test and the stability of equipment operation.

[0042] The second lifting mechanism 301b includes a sealing block 301c that can be slidably mounted between two mounting side plates 304b, and a second lifting cylinder that drives the sealing block 301c to move up and down. The pressurizing sealing rod 301a is fixedly mounted on the sealing block 301c. A straight guide groove 304b1 is provided on the mounting side plate 304b. The two ends of the sealing block 301c extend into the straight guide groove 304b1 of the mounting side plate 304b respectively. The second lifting cylinder drives the sealing block 301c to move up and down along the straight guide groove 304b1, which restricts the movement path of the sealing block 301c and avoids deviation.

[0043] The pressurizing and sealing rod 301a includes a vertical rod 301a1 and a sealing rubber 301a2 fixedly installed at the lower end of the vertical rod 301a1. The vertical rod 301a1 has a first through hole that extends axially, and the sealing rubber 301a2 has a second through hole that extends along its height direction. The first through hole and the second through hole are connected. The sealing rubber 301a2 is fixedly assembled to the lower end of the vertical rod 301a1 by a sealant screw 301a3. The sealant screw 301a3 passes upward through the sealing rubber 301a2 from the lower end of the second through hole and is threaded into the first through hole. The sealant screw 301a3 has a third through hole that extends axially. The pressurizing pipe 7 is connected to the upper end of the first through hole.

[0044] After the gas meter 4's connector 401 is fixedly clamped between the internal thread structures of the two clamping components 302d, under the driving action of the second lifting mechanism 301b, the sealing rubber 301a2 can extend downward into the space enclosed by the two clamping components 302d and abut against the upper end of the connector 401. The internal thread structure clamping it onto the threaded connector of the gas meter 4 provides sufficient longitudinal support, ensuring that the connector 401 will not come off downward when subjected to a large downward pressure from the pressurized sealing rod 301a, thus guaranteeing the seal at this location.

[0045] The pressurizing and sealing rod 301a has a first through hole, a second through hole and a third through hole that are interconnected to form a gas passage. The gas passage is integrated with the sealing mechanism to shorten the gas charging path. One end of the gas passage is connected to the pressurizing pipe 7, and the other end is connected to the gas meter 4 through the connector 401.

[0046] like Figure 1 and Figures 3 to 7 As shown, a gas storage tank assembly 8 is also provided inside the testing frame 1. A first solenoid valve 801 is provided on the gas storage tank assembly 8. A second solenoid valve 101 is correspondingly provided at the top of the testing frame 1 near the crossbeam. A first pipe 9 is connected between the gas outlet end of the first solenoid valve 801 and the gas inlet end of the second solenoid valve 101. A pressurization pipe 7 is connected to the gas outlet end of the second solenoid valve 101. The pressurization pipe 7 is connected to the gas meter 4 through the gas passage on the pressurization sealing rod 301a. The gas in the gas storage tank assembly 8 passes sequentially through the first solenoid valve 801, the first pipe 9, the second solenoid valve 101, and the pressurization pipe 7, entering the gas passage of the pressurization sealing rod 301a, and finally being sent into the gas meter 4. After filling, the dual solenoid valves are closed synchronously to achieve reliable pressure maintenance, forming a closed pressure-bearing chamber inside the gas meter 4. The gas pressure inside the gas meter 4 is higher than that outside. If there is a leakage defect in the gas meter 4 casing or joints, the pressurized gas inside will overflow from the defect and form bubbles in the water. This allows for a direct judgment of whether there is a sealing problem in the gas meter, significantly improving the accuracy and reliability of sealing detection.

[0047] The leak detection fixture assembly 3 also includes a support component 303. A third lifting mechanism 303a of the support component 303 is mounted on the support 304a. A support plate 303c is located below the third lifting mechanism 303a. The support plate 303c is connected to the third lifting mechanism 303a via a workpiece lifting rod 303b. The third lifting mechanism 303a can be a cylinder structure, achieving the lifting function through a cylinder.

[0048] At least four L-shaped workpiece positioning blocks 303c1 are also arranged on the support plate 303c. The workpiece positioning blocks 303c1 are located on the left, right, and rear sides of the gas meter 4, respectively. The gas meter 4 is quickly positioned by the workpiece positioning blocks 303c1, and then, under the drive control of the third lifting mechanism 303a, the workpiece lifting rod 303b and the support plate 303c move towards or away from the clamping mechanism 302.

[0049] A cylinder rotation shaft 5 is provided at one end of the second lifting mechanism 301b away from the sealing block 301c. The cylinder rotation shaft 5 is connected to the crossbeam of the detection frame 1 through a rotating bearing 6. The cylinder rotation shaft 5 and the rotating bearing 6 enable the rotation of the leak detection fixture assembly 3, allowing for leak detection observation using multiple methods.

[0050] like Figure 2 and Figure 8 As shown, the water tank assembly 2 includes two water tanks 201 arranged side by side. A first lifting assembly 202 is provided below each water tank 201. The first lifting mechanism 202 is fixed on the support beam 102 in the middle of the testing frame 1, and linear guide shafts 203 are provided on both sides of the first lifting mechanism 202. The linear guide shaft 203 includes a guide shaft and a bearing seat. The bearing seat is installed on the support beam 102. The water tank 201 moves up and down under the drive of the first lifting mechanism 202, and the linear guide shaft 203 ensures that the water tank 201 does not deviate when moving up and down. The two water tanks 201 are arranged side by side and can be raised and lowered according to the leak detection fixture assembly 3 corresponding to their water tanks 201. This avoids the shaking and jamming caused by synchronization error and uneven load when the integral water tank is raised and lowered, so that the immersion testing of each station does not interfere with each other, the operation is more stable, and it is also convenient for individual debugging and maintenance, further improving the testing flexibility and equipment reliability.

[0051] The gas meter leak detection device of this application operates in a coherent and orderly manner, combining multi-station synchronous detection, precise positioning and sealing, reliable pressure maintenance, and independent immersion detection. The specific steps are as follows:

[0052] Material loading preparation: Place the gas meter 4 to be tested on the support plate 303c of each leak detection station assembly 3 through the workpiece positioning block 303c1, and ensure that the connector 401 of the gas meter 4 is aligned with the clamping mechanism 302 on the upper part of the leak detection fixture assembly 3 to complete the material loading operation and prepare for subsequent testing.

[0053] Lifting, positioning, and clamping: Activate the third lifting mechanism 303a at both ends of the support assembly 303 to drive the support plate 303c to smoothly lift the gas meter 4 to the loading position, namely the clamping component 302d between the first positioning plate 302b and the second positioning plate 302c of the clamping mechanism 302, achieving precise positioning; subsequently, the clamping cylinder 302a of the clamping mechanism 302 begins to operate, pushing the second positioning plate 302c closer to the first positioning plate 302b, so that the clamping component 302d closes to form a clamping device. By using the internal thread inside the clamping component 302d to engage with the external thread on the connector 401, the gas meter 4 is firmly locked, and a preliminary seal is formed by the thread engagement.

[0054] Support reset and sealing docking: Activate the third lifting mechanism 303a to drive the support plate 303c to move away from the clamping mechanism 302, so that it does not come into contact with the bottom of the gas meter 4. At the same time, the second lifting mechanism 301b of the pressurizing and sealing mechanism 301 is activated. The second lifting mechanism 301b drives the sealing block 301c and the pressurizing and sealing rod 301a to move downward. The protruding blocks at both ends of the sealing block 301c slide smoothly along the straight guide groove 304b1 of the mounting side plate 304b to ensure the coaxiality of the lifting and lowering of the sealing rod 301c, so as to align it with the connector 401 of the gas meter 4. It continues to descend, driving the pressurizing and sealing rod 301a to extend into the clamping device formed by the clamping component 302d. The sealing rubber 301a2 is pressed against the outside of the connector 401, and the sealing screw 301d extends into the inside of the connector 401 to complete the internal and external sealing action of the connector 401. At this time, the gas passage of the pressurizing and sealing mechanism 301 is connected to the inside of the gas meter 4.

[0055] Gas filling and pressure holding: When the gas supply system is started, the gas in the gas storage tank assembly 8 passes through the first solenoid valve 801, the first pipeline 9, the second solenoid valve 101 and the pressure filling pipeline 7 in sequence, and is sent into the gas passage of the pressure sealing mechanism 301, and then injected into the gas meter 4 to fill the gas meter 4; when the gas meter 4 is filled to the preset detection pressure, the first solenoid valve 801 and the second solenoid valve 101 are closed. The synchronous closing of the two solenoid valves realizes the reliable pressure holding of the gas in the gas meter, so that a closed pressure-bearing cavity is formed inside the gas meter 4, which is ready for leak detection.

[0056] Immersion test: Activate the first lifting mechanism 202 of the water tank assembly 2. The first lifting mechanism 202 drives the two parallel water tanks 201 to rise synchronously or independently. The linear guide shafts 203 on both sides provide stable guidance for the water tank lifting and lowering, preventing the water tank from tilting. Until the water tank rises to the preset height, the gas meter 4 to be tested is completely immersed in the water. The operator can rotate the gas meter through the cylinder rotating shaft 5 to observe from all directions whether there are bubbles generated on the front, back, left and right sides of the gas meter, and determine whether there is a leak in the inner box of the gas meter. At the same time, the water tanks at each station are lifted and lowered independently without interfering with each other, ensuring the accuracy of the test.

[0057] Exhaust and Reset: After the test is completed, the water tank 201 is lowered to its original position by the first lifting mechanism 202, and the second solenoid valve 101 is opened to quickly discharge the high-pressure gas in the gas meter 4, thus completing the depressurization. At the same time, the third lifting mechanism 303a of the support assembly 303 drives the support plate 303c to the loading position. Subsequently, the second lifting mechanism 301b of the pressurizing and sealing mechanism 301 drives the sealing rod 301c to reset upward, releasing the seal. The clamping cylinder 302a of the clamping mechanism 302 drives the second positioning plate 302c and the clamping component 301d to move in the opposite direction, releasing the lock on the gas meter 4, so that the gas meter 4 falls back onto the support plate 303c, completing the entire test cycle.

[0058] Material feeding and circulation: Remove the qualified and unqualified gas meters 4 respectively to complete the material feeding. Then repeat the above material feeding and unloading steps to enter the next round of batch testing, so as to realize automated continuous testing operation.

[0059] During leak detection, the gas meter 4 of this application is clamped onto the clamping mechanism 302, with a certain distance maintained between its bottom and the support component 303. On the one hand, this avoids interference caused by contact between the support base 303 and the bottom of the gas meter 4, preventing the bottom of the gas meter 4 from being deformed or scratched by pressure, thus protecting the gas meter 4 under test from damage. On the other hand, this gap allows for gas flow space, preventing the support base 303 from blocking the bottom interface or leak point of the gas meter 4, ensuring that the gas can evenly fill the inner cavity of the gas meter during inflation. At the same time, during water immersion testing, the water can fully contact the bottom of the gas meter 4, facilitating comprehensive observation of the leakage situation on all sides of the gas meter 4, avoiding missed detections, and further improving the comprehensiveness and accuracy of the detection.

[0060] The pressurized sealing mechanism 301 uses a coaxial plug-in sealing rod 301a and connector 401, which provides precise guidance and rapid alignment, preventing sealing failure due to interface eccentricity or tilt. Combined with the sealing rubber 301a2 and sealing screw 301a3, it achieves double compression sealing, resulting in higher pressure resistance and less leakage during pressure holding. It is more durable and provides more reliable sealing, making it particularly suitable for high-precision gas tightness testing of gas meter interfaces.

[0061] Integrating the pressurization sealing mechanism 301 and the pressurization pipeline 7 together simplifies the structure, reduces leakage points, and improves stability. It eliminates the need for additional connecting pipelines, avoiding leakage risks at pipeline joints. At the same time, it allows pressurized gas to be injected directly into the gas meter through the sealing mechanism 301, resulting in a shorter path and more stable pressure. Combined with clamping positioning and flexible observation design, it further ensures the accuracy and efficiency of detection. Compared with the traditional separate structure, it is more suitable for the needs of automated batch testing.

[0062] During testing, the leak detection fixture assembly 3 can be rotated, which can drive the gas meter 4 to rotate synchronously. This allows operators to observe the surface of the gas meter 3 from all directions, front, back, left, and right, to see if bubbles are generated. This enables leak detection without blind spots, facilitates quick location of leaks, effectively avoids missed detections due to limited observation angles, and improves the comprehensiveness and accuracy of the detection.

[0063] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. Those skilled in the art, under the guidance of the present invention, can make various similar representations without departing from the spirit and claims of the present invention, and such modifications all fall within the protection scope of the present invention.

Claims

1. A gas meter leak detection device, comprising a detection frame (1), characterized in that: The testing frame (1) is equipped with a water cylinder assembly (2) which is lifted and installed by the first lifting mechanism (202). Gas meter leak detection stations are distributed above the water cylinder assembly (2), and a leak detection fixture assembly (3) is installed at each leak detection station. The leak detection fixture assembly (3) is provided with a clamping mechanism (302) and a pressurizing and sealing mechanism (301). The clamping mechanism (302) is used to fix and clamp the gas meter (4) to be tested. The pressurizing and sealing mechanism (301) includes a pressurizing pipe (7) and a pressurizing and sealing rod (301a) connected to the pressurizing pipe (7). The pressurizing and sealing rod (301a) is mounted on the upper part of the leak detection fixture assembly (3) through a second lifting mechanism (301b). When the gas meter (4) to be tested is fixedly clamped on the clamping mechanism (302), under the drive control of the second lifting mechanism (302b), the sealing and pressing rod (301a) can be inserted downward into the connector (401) of the gas meter (4) and keep the pressurizing pipe (7) connected to the connector (401). When the pressurizing and sealing rod (301a) is inserted into the connector of the gas meter (4), the water cylinder assembly (2) can move upward under the drive control of the first lifting mechanism (202) and immerse the gas meter (4) in the water cylinder assembly (2).

2. The gas meter leak detection device according to claim 1, characterized in that: The leak detection tooling assembly (3) also includes a base frame (304), which includes a mounting horizontal plate (304a) and mounting side plates (304b). A support (304c) is provided at the lower part of the two opposite mounting side plates (304b), and the clamping mechanism (302) is disposed in the support (304c). The inner sidewalls of the two opposing supports (304c) are provided with sliding grooves. The clamping mechanism (302) includes a first positioning plate (302b) and a second positioning plate (302c) that are slidably installed in the sliding grooves at both ends, and a clamping cylinder (302a) for driving the first positioning plate (302b) and the second positioning plate (302c) to move closer or further away from each other. Each of the first positioning plate (302b) and the second positioning plate (302c) is equipped with a clamping component (302d) at a position directly opposite to each other. The inner side of the clamping component (302d) is provided with a semi-circular groove (302d1). Under the drive of the clamping cylinder (302a), the semi-circular grooves (302d1) of the two clamping components (302d) can be closed and fixed on the connector (401) of the gas meter (4).

3. A gas meter leak detection device according to claim 2, characterized in that: The lower inner wall of the semi-circular groove (302d1) is provided with an internal thread structure.

4. A gas meter leak detection device according to claim 2, characterized in that: The second lifting mechanism (301b) includes a sealing block (301c) that can be slidably mounted between two mounting side plates (304b), and a second lifting cylinder that drives the sealing block (301c) to move up and down. The pressurizing sealing rod (301a) is fixedly mounted on the sealing block (301c).

5. A gas meter leak detection device according to claim 4, characterized in that: The pressurized sealing rod (301a) includes a vertical rod (301a1) and a sealing rubber (301a2) fixedly installed at the lower end of the vertical rod (301a1). The vertical rod (301a1) has a first through hole that extends axially, and the sealing rubber (301a2) has a second through hole that extends along its height direction. The first through hole and the second through hole are connected, and the pressurized pipe (7) is connected to the upper end of the first through hole. After the gas meter (4) connector (401) is fixedly clamped between the internal thread structure of the two clamping components (302d), under the driving action of the second lifting mechanism (301b), the sealing rubber (301a2) can extend downward into the space enclosed by the two clamping components (302d) and abut against the upper end of the connector (401).

6. A gas meter leak detection device according to claim 5, characterized in that: Inside the testing frame (1), there is also a gas storage tank assembly (8), on which a first solenoid valve (801) is installed. A second solenoid valve (101) is correspondingly installed at the top of the testing frame (1) near the crossbeam. A first pipe (9) is connected between the outlet end of the first solenoid valve (801) and the inlet end of the second solenoid valve (101). The outlet end of the second solenoid valve (101) is connected to a pressurization pipe (7). The pressurization pipe (7) is connected to the gas meter (4) through the gas passage on the pressurization sealing rod (301a).

7. A gas meter leak detection device according to claim 2, characterized in that: The leak detection tooling assembly (3) also includes a support component (303). The third lifting mechanism (303a) of the support component (303) is installed on the support (304a). A support plate (303c) is provided below the third lifting mechanism (303a). The support plate (303c) and the third lifting mechanism (303a) are connected by a workpiece lifting rod (303b).

8. A gas meter leak detection device according to claim 7, characterized in that: At least four "L"-shaped workpiece positioning blocks (303c1) are also arranged on the support plate (303c), and the workpiece positioning blocks (303c1) are located on the left and right sides and the rear side of the gas meter (4).

9. A gas meter leak detection device according to claim 4, characterized in that: The second lifting mechanism (301b) is provided with a cylinder rotating shaft (5) at one end away from the sealing block (301c). The cylinder rotating shaft (5) is connected to the crossbeam of the detection frame (1) through a rotating bearing (6).

10. A gas meter leak detection device according to claim 1, characterized in that: The water tank assembly (2) includes two water tanks (201) arranged side by side. A first lifting assembly (202) is provided below each water tank (201). The first lifting mechanism (202) is fixed on the support beam (102) in the middle of the detection frame (1). Linear guide shafts (203) are provided on both sides of the first lifting mechanism (202). The water tank (201) moves up and down under the drive of the first lifting mechanism (202).

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