Gas meter movement group leakage detection device and method

Abstract

The invention relates to the technical field of gas meter production equipment, in particular to a leakage detection device and method for a gas meter movement set. The device comprises at least one leakage detection station, and the leakage detection station comprises a placement mechanism, a butt joint mechanism and a test gas circuit mechanism. According to the device, the leakage detection operation of the movement group is automatically completed through the leakage detection station, and high automation is realized, so that the manual operation time is greatly reduced, the leakage detection efficiency of the gas meter movement group is improved, and the beat requirement of large-scale production can be met; the test gas circuit mechanism firstly quickly generates a test negative pressure greater than a target pressure range, and then adjusts the test negative pressure to be within the target pressure range, so that the internal pressure of the movement group can be quickly adjusted to be within the target pressure range through the operation, and meanwhile, the negative pressure can be prevented from exceeding the bearing range of the movement group; therefore, the efficiency of single-time leakage detection is improved, and quick leakage detection is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas meter production equipment, and particularly relates to a gas meter movement leak detection device and method. BACKGROUND

[0002] The movement of a gas meter is a core component of the gas meter, and the air tightness of the movement directly relates to the metering accuracy and use safety of the gas meter. Therefore, after the movement is assembled, air tightness detection is an indispensable key link in the production process of the gas meter. Leak detection needs to be performed after the movement is assembled. Various methods are used in the prior art to test, such as traditional water detection or manual operation. However, the operation is generally cumbersome, and drying treatment is required after detection, which is time-consuming and may affect the accuracy. Even if the existing part of the automatic leak detection equipment, the internal chamber switching condition of the movement cannot be simulated for full range testing, and the negative pressure control efficiency and accuracy are insufficient, which cannot meet the efficiency requirements of large-scale production.

[0003] Therefore, the applicant considers designing a gas meter movement leak detection device and method capable of improving efficiency. SUMMARY

[0004] In view of the above problems of the prior art, the present application aims to provide a gas meter movement leak detection device and method capable of improving efficiency.

[0005] In order to solve the above technical problems, the present application adopts the following technical solutions: A gas meter movement leak detection device comprises at least one leak detection station, and the leak detection station comprises a placing mechanism, a docking mechanism and a test gas path mechanism. The placing mechanism is used to receive a movement to be detected. The docking mechanism is used to form a sealed connection with an air outlet pipe of the movement. The test gas path mechanism is in communication with the docking mechanism, and is used to apply a test negative pressure to the inside of the movement, adjust the test negative pressure, maintain the pressure inside the movement and detect the pressure change inside the movement. The working principle and advantages of the present application are as follows: The device receives the movement group to be tested for leakage through the placing mechanism, and then the sealing connection of the docking mechanism and the air outlet pipe of the movement group is realized, so that the docking mechanism and the cavity inside the movement group are communicated; because the docking mechanism test gas path mechanism is communicated, when the docking mechanism and the inside of the movement group are communicated, the test gas path mechanism and the inside of the movement group are communicated, and then the test gas path mechanism starts the leakage test operation; when the test gas path mechanism performs the leakage test operation, first, the test negative pressure higher than the target pressure range is applied to the inside of the movement group, and then the test negative pressure is adjusted to the target pressure range; once the negative pressure inside the movement group reaches the target pressure range, the pressure is maintained, and the pressure change of the movement group is monitored to determine whether the movement group is qualified; the device automatically completes the leakage test operation of the movement group through the leakage test station, realizes high automation, greatly reduces the manual operation time, improves the leakage test efficiency of the gas meter movement group, and can meet the rhythm requirements of large-scale production; the test gas path mechanism first quickly generates a test negative pressure greater than the target pressure range, and then adjusts the test negative pressure to the target pressure range; through this operation, the pressure inside the movement group can be quickly adjusted to the target pressure range, and at the same time, the negative pressure can be avoided to exceed the bearing range of the movement group, so as to avoid damage to the internal components of the movement group and improve the efficiency of single leakage test, and realize rapid leakage test.

[0006] Further, the placing mechanism is placed directly below the docking mechanism, and the placing mechanism comprises a first lifting piece and a placing disc, and the placing disc is provided with a limiting piece for positioning the movement group.

[0007] Further, the docking mechanism comprises a second lifting piece, a docking pipe for docking with the air outlet pipe of the movement group, and a sealing member sleeved on the docking pipe; the second lifting piece is fixedly connected with a sleeve pipe sleeved on the docking pipe at the lifting end, and the second lifting piece drives the sleeve pipe to approach or move away from the sealing member when lifting.

[0008] Further, the test gas path mechanism comprises a test pipe in communication with the docking mechanism, and the test pipe is sequentially provided with a pressure sensor, a pressure maintaining valve, a pressure relief valve and a negative pressure source in the direction of air flow.

[0009] Further, the negative pressure source is configured to generate a test negative pressure greater than the target pressure range, the pressure relief valve is configured to adjust the test negative pressure to the target pressure range, the pressure maintaining valve is configured to be closed to maintain pressure when the negative pressure reaches the target pressure range, and the pressure sensor is used to monitor the pressure change.

[0010] Further, the leakage test station further comprises a dialing mechanism, the dialing mechanism comprises a dialing piece and a rotating assembly for driving the dialing piece to rotate, and the dialing piece is used to contact and drive the pointer disc of the movement group to rotate.

[0011] Further, the rotating assembly comprises a rotating piece, a shaft coupling, a first synchronous pulley, a synchronous track and a second synchronous pulley, the rotating piece drives the first synchronous pulley through the shaft coupling, the synchronous track connects the first synchronous pulley and the second synchronous pulley, and the poking piece is connected to the second synchronous pulley.

[0012] Further, the rotating assembly further comprises a micro switch, and the shaft coupling is provided with a cam for opening or closing the micro switch.

[0013] Further, a rack is further provided, and the rack is provided with a plurality of the leak detection stations.

[0014] A leak detection method for a gas meter movement set, which adopts the leak detection device for the gas meter movement set. The method comprises the following steps: S1 placing the movement set to be detected on a placing mechanism; S2 sealingly connecting the gas outlet pipe of the movement set to a docking mechanism; S3 applying a test negative pressure greater than a target pressure range to the inside of the movement set through a test gas path mechanism; S4 adjusting the test negative pressure to the target pressure range; S5 when the negative pressure in the inside of the movement set is in the target pressure range, maintaining the negative pressure in the inside of the movement set and maintaining the pressure maintaining state in the inside of the movement set for a period of time; S6 detecting the pressure change in the inside of the movement set in the pressure maintaining state and judging whether the movement set is qualified according to the pressure change. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Fig. 1 is a perspective view of a leak detection device for a gas meter movement set according to an embodiment of the present application; Figure 2 Fig. 2 is a front view of the leak detection device for the gas meter movement set according to the embodiment of the present application; Figure 1 Fig. 3 is an enlarged view of A in Fig. 2; Figure 3 Fig. 4 is a sectional view of the leak detection device for the gas meter movement set according to the embodiment of the present application; Figure 4 Fig. 5 is a sectional view of the leak detection device for the gas meter movement set according to the embodiment of the present application; Figure 5 Fig. 6 is a perspective view of a leak detection station according to an embodiment of the present application; Figure 6 Fig. 7 is a front view of the leak detection station according to the embodiment of the present application; Figure 7 Fig. 8 is a perspective view of a placing mechanism according to an embodiment of the present application; Figure 8 Fig. 9 is a sectional view of a docking mechanism according to an embodiment of the present application; Figure 9 A sectional structure schematic diagram of a test gas path mechanism and a docking mechanism for an embodiment of the present application is shown in FIG. 1; Figure 10 A three-dimensional structure schematic diagram of a dialing mechanism for an embodiment of the present application is shown in FIG. 2; Figure 11 A top view structure schematic diagram of a movement group for an embodiment of the present application is shown in FIG. 3; In the above-mentioned drawings: 11, repair bench; 12, grabbing robot; 20, movement group; 21, gas outlet pipe; 22, pointer disc protrusion; 210, rack; 220, leak detection station; 300, placing mechanism; 310, first lifting piece; 320, placing disc; 321, limiting convex strip; 322, limiting vertical plate; 323, limiting rod; 400, docking mechanism; 410, docking pipe; 411, sealing ring; 412, sleeve; 420, second lifting piece; 500, test gas path mechanism; 510, test pipe; 511, negative pressure generator; 512, pressure relief valve; 513, pressure maintaining valve; 514, pressure sensor mounting hole; 600, dialing mechanism; 610, rotating piece; 620, coupling; 621, cam; 630, first synchronous pulley; 640, synchronous track; 650, second synchronous pulley; 660, dialing rod; 670, micro switch; 710, in-place sensor. DETAILED DESCRIPTION

[0016] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0017] Referring to Figures 1 to 11 , the present embodiment provides a leak detection device for a gas meter movement group 20, which comprises at least one leak detection station 220, and the leak detection station 220 comprises a placing mechanism 300, a docking mechanism 400 and a test gas path mechanism 500; The placing mechanism 300 is used to receive the movement group 20 to be detected for leakage; The docking mechanism 400 is used to form a sealed connection with the gas outlet pipe 21 of the movement group 20; The test gas path mechanism 500 is in communication with the docking mechanism 400, and is used to apply a test negative pressure to the inside of the movement set 20, adjust the test negative pressure, maintain the pressure inside the movement set 20, and detect the pressure change inside the movement set 20. In this embodiment, the movement set 20 to be tested for leakage is received by the placing mechanism 300, and then the docking mechanism 400 is sealingly connected to the gas outlet pipe 21 of the movement set 20, so that the docking mechanism 400 is in communication with the chamber inside the movement set 20. Since the test gas path mechanism 500 is in communication with the docking mechanism 400, when the docking mechanism 400 is in communication with the inside of the movement set 20, the test gas path mechanism 500 is in communication with the inside of the movement set 20, and the test for leakage is started through the test gas path mechanism 500. When the test gas path mechanism 500 performs the test for leakage, a test negative pressure higher than the target pressure range is first applied to the inside of the movement set 20, and then the test negative pressure is adjusted to the target pressure range. Once the negative pressure inside the movement set 20 reaches the target pressure range, the pressure is maintained, and the pressure change inside the movement set 20 is monitored to determine whether the movement set 20 is qualified. The device automatically completes the test for leakage of the movement set 20 through the test for leakage station 220, and realizes high automation, which greatly reduces the manual operation time, improves the test for leakage efficiency of the gas meter movement set 20, and can meet the rhythm requirements of large-scale production. The test gas path mechanism 500 first quickly generates a test negative pressure greater than the target pressure range, and then adjusts the test negative pressure to the target pressure range. Through this operation, the pressure inside the movement set 20 can be quickly adjusted to the target pressure range, and at the same time, it can also avoid the negative pressure exceeding the bearing range of the movement set 20, causing damage to the internal components of the movement set 20, improving the efficiency of single test for leakage, and realizing rapid test for leakage.

[0018] Preferably, as Figures 1 to 7As shown, the placing mechanism 300 is placed directly below the docking mechanism 400, and the placing mechanism 300 includes a first lifting piece 310 and a placing disc 320, and the placing disc 320 is provided with a limiting piece for positioning the movement set 20; the placing disc 320 is used for bearing the movement set 20, and the limiting piece on the placing disc 320 cooperates with the shape of the movement set 20 to accurately fix the movement set 20 at a preset position, so as to ensure that the air outlet pipe 21 of the movement set 20 is aligned with the center line of the docking mechanism 400; the placing mechanism 300 is arranged directly below the docking mechanism 400, and when the movement set 20 is accurately positioned, the first lifting piece 310 drives the placing disc 320 with the movement set 20 to move vertically upward until the air outlet pipe 21 of the movement set 20 is accurately docked with the docking mechanism 400 above; the automatic docking is realized, and air leakage or damage caused by misalignment is avoided, and the leakage checking efficiency is further improved; specifically, the limiting piece includes a limiting convex strip 321, a limiting vertical plate 322 and a limiting rod 323 which are fixedly connected to the limiting disc, the limiting convex strip 321 limits the bottom of the movement set 20, the limiting vertical plate 322 limits the left and right sides of the movement set 20, and the limiting rod 323 can limit the movement of the movement set 20; the above-mentioned limiting piece can limit the movement set 20 in multiple directions when the movement set 20 is placed on the placing mechanism 300, so as to ensure the smooth progress of subsequent leakage checking; more specifically, the placing mechanism 300 further includes a fixedly arranged in-place sensor 710, the in-place sensor 710 can detect whether the movement set 20 is in place, and when it is detected that the movement set 20 is in place (when the movement set 20 is in contact with the limiting rod 323), the first lifting piece 310 is started to rise and docking is performed; the in-place sensor 710 can adopt a distance sensor in the prior art.

[0019] Preferably, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 8As shown, the docking mechanism 400 comprises a second lifting piece 420, a docking pipe 410 for docking with the air outlet pipe 21 of the movement set 20, a sealing member sleeved on the docking pipe 410; the lifting end of the second lifting piece 420 is fixedly connected with a sleeve pipe 412 sleeved on the docking pipe 410, and the second lifting piece 420 drives the sleeve pipe 412 to approach or move away from the sealing member when lifting; after the placing mechanism 300 lifts the movement set 20 into position, the docking pipe 410 extends into the air outlet pipe 21 of the movement set 20, and the sealing member (for example, an O-shaped sealing ring 411) sleeved on the docking pipe 410 enters the air outlet pipe 21; then the sleeve pipe 412 fixed on the lifting end of the second lifting piece 420 is driven by the second lifting piece 420 to move downward, and the sealing member is pressed to tightly adhere to the inner side wall of the air outlet pipe 21 of the movement set 20, thereby forming a reliable sealing connection; after the leakage test is completed, the sleeve pipe 412 is driven by the second lifting piece 420 to move away from the sealing member, the sealing member rebounds, and then the first lifting piece 310 lowers with the movement set 20, thereby completing the quick disengagement.

[0020] Preferably, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 9As shown, the test gas path mechanism 500 includes a test pipe 510 in communication with the docking mechanism 400, and the test pipe 510 is sequentially provided with a pressure sensor, a pressure maintaining valve 513, a pressure relief valve 512 and a negative pressure source in the direction of air flow; the negative pressure source is configured to generate a test negative pressure greater than the target pressure range, the pressure relief valve 512 is configured to adjust the test negative pressure to the target pressure range, the pressure maintaining valve 513 is configured to be closed for pressure maintaining when the negative pressure reaches the target pressure range, and the pressure sensor is used for monitoring the pressure change; at the beginning of the leak detection, the negative pressure source applies a test negative pressure higher than the target pressure range to the inside of the movement set 20 through the test pipe 510 in communication with the docking mechanism 400, specifically, the test pipe 510 is in communication with the docking pipe 410; the pressure relief valve 512 can release the excess part of the test negative pressure in the test pipe 510, so that the inside of the movement set 20 can quickly reach the negative pressure of the target pressure range, and damage to the inside of the movement set 20 caused by the excessively high negative pressure is avoided; the pressure sensor can monitor the pressure inside the movement set 20 in real time, and when the negative pressure value enters the target pressure range, the pressure maintaining valve 513 is controlled to be closed, and a stable pressure maintaining test is entered; during the pressure maintaining stage, the pressure sensor continuously monitors the change amount of the pressure within a predetermined time to determine whether the movement set 20 is qualified; the scheme can effectively avoid damage to the movement set 20 caused by overpressure, quickly make the pressure inside the movement set 20 reach the target pressure range, improve the efficiency of single leak detection, and realize rapid leak detection; the components of the test gas path mechanism 500 are sequentially connected in the direction of air flow, the structure layout is clear, and the integration, installation and maintenance are facilitated; specifically, the negative pressure source can adopt the negative pressure generator 511 in the prior art, the pressure maintaining valve 513 can adopt the angle seat valve in the prior art, the pressure sensor (not shown in the figure) is installed in the pressure sensor mounting hole 514, the pressure sensor can adopt the differential pressure transmitter in the prior art, and of course, the above-mentioned negative pressure source, pressure relief valve 512, pressure maintaining valve 513 and pressure sensor can be selected according to the actual scene; more specifically, a vacuum filter can be further arranged between the pressure relief valve 512 and the pressure maintaining valve 513 to intercept sundries.

[0021] Preferably, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 10 and Figure 11As shown, the leak detection station 220 further comprises a dialing mechanism 600, which comprises a dialing member and a rotating assembly for driving the dialing member to rotate, the dialing member being configured to contact and drive the pointer plate of the movement set 20 to rotate; after the dialing member of the dialing mechanism 600 is sealingly connected to the gas outlet pipe 21 of the movement set 20 on the abutting mechanism 400 and the placing mechanism 300, the dialing member contacts the pointer plate on the top side of the movement set 20 on the placing mechanism 300 (specifically, the pointer plate protrusion 22 on the pointer plate); the rotating action of the dialing member drives the pointer plate of the movement set 20 to rotate synchronously, so as to open different chambers in the movement set 20, and the specific working principle of the gas meter movement set 20 is not described herein; the movement set 20 in different working states can be leak-detected more comprehensively; for example, when the movement set 20 with four chambers is tested, the dialing mechanism 600 is used to adjust the movement set 20 to the first group of chambers opened and the second group of chambers closed, and then the test gas path mechanism 500 is used to test the first group of chambers opened; after the test is completed, the dialing mechanism 600 is used to adjust the movement set 20 to the first group of chambers closed and the second group of chambers opened, and then the test gas path mechanism 500 is used to test the second group of chambers opened, so as to realize comprehensive leak detection of the movement set 20; the internal state switching of the movement set 20 does not need manual intervention in the leak detection process, and the leak detection efficiency is further improved.

[0022] Preferably, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 10 , and Figure 11 , the rotating assembly comprises a rotating member 610, a coupling 620, a first synchronous pulley 630, a synchronous track 640, and a second synchronous pulley 650, the rotating member 610 drives the first synchronous pulley 630 through the coupling 620, the synchronous track 640 connects the first synchronous pulley 630 and the second synchronous pulley 650, and the dialing member is connected to the second synchronous pulley 650; the output shaft of the rotating member 610 is connected to the first synchronous pulley 630 through the coupling 620, and then drives the second synchronous pulley 650 through the synchronous track 640, so that the second synchronous pulley 650 drives the dialing member to rotate; the coupling 620 connects the rotating member 610 and the first synchronous pulley 630, and can play the roles of connection, buffering, and compensation of axis deviation; the synchronous track 640 surrounds the first synchronous pulley 630 and the second synchronous pulley 650, ensures the synchronous movement between the first synchronous pulley 630 and the second synchronous pulley 650, and realizes accurate switching of the chambers in the movement set 20.

[0023] Preferably, as shown in Figure 1 , Figure 2 , Figure 3 ,Figure 4 、 Figure 5 、 Figure 6 、 Figure 10 and Figure 11 As shown in the figure, the rotating assembly further comprises microswitches 670, and the coupling 620 is provided with cams 621 for opening or closing the microswitches 670; the cams 621 are arranged on the coupling 620, and when the rotating member 610 drives the coupling 620 to rotate, the cams 621 also rotate; through the specific shape of the cams 621, when the actuating member of the actuating mechanism 600 reaches a certain preset key position (for example, the exact end point of the chamber switching), the protruding part of the cam 621 can accurately trigger the microswitch 670; after the microswitch 670 is triggered, the rotation of the rotating member 610 is immediately stopped, ensuring the accuracy of the chamber switching of the actuating member to the movement assembly 20, avoiding the over-rotation of the rotating member 610, and improving the leak detection effect; specifically, the above-mentioned microswitches 670 comprise at least two; specifically, the actuating member is an actuating rod 660.

[0024] Preferably, as shown in Figures 1 to 4 The gas meter movement assembly 20 leak detection device further comprises a rack 210, and the rack 210 is provided with a plurality of leak detection stations 220; each leak detection station 220 can independently receive, dock, test, and the like to the movement assembly 20, and a plurality of movement assemblies 20 can be subjected to leak detection operation at the same time; all stations share one rack 210 as a structural basis, facilitating unified gas circuit and circuit wiring, and management of the central control system, realizing efficient beat production; specifically, the above-mentioned placing mechanism 300, the docking mechanism 400, the test gas circuit mechanism 500, the actuating mechanism 600, and the in-place sensor 710 are installed on the rack 210.

[0025] More specifically, the above-mentioned rotating member 610 can directly adopt a stepper motor in the prior art, and the above-mentioned first lifting member 310 and the second lifting member 420 can directly adopt a telescopic air cylinder in the prior art.

[0026] A gas meter movement assembly 20 leak detection method adopts the above-mentioned gas meter movement assembly 20 leak detection device; The method comprises the following steps: S1 placing the movement assembly 20 to be subjected to leak detection on the placing mechanism 300; S2 sealingly connecting the gas outlet pipe 21 of the movement assembly 20 to the docking mechanism 400; S3 applying a test negative pressure greater than the target pressure range to the inside of the movement assembly 20 through the test gas circuit mechanism 500; S4 adjusting the test negative pressure to the target pressure range; When the negative pressure inside the movement set 20 is within the target pressure range, the negative pressure inside the movement set 20 is maintained, and the pressure maintaining state of the movement set 20 is maintained for a period of time; S6 detects the pressure change inside the movement set 20 in the pressure maintaining state, and determines whether the movement set 20 is qualified according to the pressure change.

[0027] The method of the present scheme can quickly reach the target pressure range of the negative pressure inside the movement set 20, shorten the entire pressure stabilizing time, improve the leak detection rhythm of a single movement set 20, meet the efficiency requirements of large-scale automated production, effectively avoid damage to the internal components of the movement set 20 caused by excessive negative pressure, and ensure the quality of the measured products.

[0028] Specifically, the target pressure range is 360Pa to 480Pa, which can meet the leak detection requirements of most gas meter movement sets 20; the time for maintaining the negative pressure is 1000ms, and the movement set 20 is qualified when the pressure leakage inside the movement set 20 is ≤120P within the pressure maintaining time, otherwise it is not qualified.

[0029] Specifically, as shown in Figure 1 and Figure 3 The gas meter movement set 20 leak detection device further includes a grabbing robot 12 and a repair table 11. The grabbing robot 12 can grab the movement set 20 to be leak detected from the production line or the stacking rack and accurately place it on the placement mechanism 300 of the leak detection station 220, and the grabbing robot 12 can also take away the qualified or unqualified movement set 20 from the station after leak detection is completed. The repair table 11 is arranged near the leak detection station 220, and the grabbing robot 12 can place the unqualified movement set 20 on the repair table 11 for repair processing. The repaired movement set 20 can be placed on the top side of the repair table 11, so that the grabbing robot can grab the repaired product to the leak detection station 220 for re-leak detection.

[0030] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A gas meter movement leak testing apparatus, characterized in that, The leak detection station comprises a placing mechanism, a docking mechanism and a test gas path mechanism. The placing mechanism is used for receiving a movement group to be detected for leakage. The docking mechanism is used for forming a sealed connection with an air outlet pipe of the movement group. The test gas path mechanism is in communication with the docking mechanism and is used for applying a test negative pressure to the inside of the movement group, adjusting the test negative pressure, maintaining the pressure inside the movement group and detecting the pressure change inside the movement group.

2. A gas meter movement set leak testing device as claimed in claim 1, characterised in that, The placing mechanism is arranged directly below the docking mechanism and comprises a first lifting member and a placing disc provided with a limiting member for positioning the movement group.

3. A gas meter movement set leak testing device as claimed in claim 1, wherein, The docking mechanism comprises a second lifting member, a docking pipe for docking with the air outlet pipe of the movement group and a sealing member sleeved on the docking pipe.

4. A gas meter movement set leak testing device as claimed in claim 1, wherein, The test gas path mechanism comprises a test pipe in communication with the docking mechanism, and the test pipe is sequentially provided with a pressure sensor, a pressure maintaining valve, a pressure relief valve and a negative pressure source in the direction of air flow.

5. A gas meter movement set leak testing device as claimed in claim 4, wherein, The negative pressure source is configured to generate a test negative pressure greater than a target pressure range, the pressure relief valve is configured to adjust the test negative pressure to the target pressure range, the pressure maintaining valve is configured to be closed to maintain pressure when the negative pressure reaches the target pressure range, and the pressure sensor is used for monitoring the pressure change.

6. A gas meter movement set leak testing device as claimed in claim 1, wherein, The leak detection station further comprises a dialing mechanism, and the dialing mechanism comprises a dialing member and a rotating assembly for driving the dialing member to rotate.

7. A gas meter movement set leak testing device as claimed in claim 6, characterised in that, The rotating assembly comprises a rotating member, a coupling, a first synchronous pulley, a synchronous track and a second synchronous pulley.

8. A gas meter movement set leak testing apparatus as claimed in claim 7, wherein, The rotating assembly further comprises a micro switch, and the coupling is provided with a cam for opening or closing the micro switch.

9. A gas meter movement set leak testing apparatus as claimed in claim 8, wherein, The machine frame is provided with a plurality of leak detection stations.

10. A method of leak hunting a gas meter movement, characterized by, The method comprises the following steps: S1 placing the movement group to be detected for leakage on the placing mechanism; S2 forming a sealed connection between the air outlet pipe of the movement group and the docking mechanism; S3 applying a test negative pressure greater than a target pressure range to the inside of the movement group through the test gas path mechanism; S4 adjusting the test negative pressure to the target pressure range; S5 maintaining the negative pressure inside the movement group when the negative pressure inside the movement group is within the target pressure range, and maintaining the pressure maintaining state inside the movement group for a period of time; S6 detecting the pressure change inside the movement group in the pressure maintaining state, and determining whether the movement group is qualified according to the pressure change. ​

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