Gas meter base meter detection system and detection method
By designing an automated gas meter base detection system that combines differential pressure detection and helium mass spectrometry, the problems of high false alarm rate and high cost in gas meter base detection have been solved, achieving an efficient and low-cost detection process.
Patent Information
- Application Number
- CN202511371163.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-24
- Publication Date
- 2025-11-28
AI Technical Summary
The existing gas meter base meter testing has a high false alarm rate for differential pressure detection, resulting in low production efficiency. Relying solely on helium detection would increase costs.
Design a gas meter base meter testing system that combines a differential pressure detection component, a buffer component, a delivery component, and a helium detection component. Through the cooperation of multiple reversing grippers and line-changing grippers, it achieves automated detection and product classification, and performs re-inspection by helium mass spectrometry when differential pressure detection is misjudged.
It has improved testing efficiency and reduced costs. Through automated testing and re-inspection, it has increased production efficiency by more than 10% and reduced the waste of materials and energy caused by misjudgments.
Smart Images
Figure CN121017110A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of helium detection technology, and in particular to a gas meter base meter detection system and detection method. Background Technology
[0002] As a key metering device in urban gas supply systems, the accuracy, sealing reliability, and long-term operational stability of gas meters directly affect the fairness of trade settlements and the safety of gas usage for users. The gas meter base, as the core component of the gas meter, has its airtightness as one of the core indicators for measuring product quality. Even minor leaks can lead to inaccurate metering and economic losses, and may also accumulate safety hazards over long-term use, causing safety accidents. Currently, the industry generally uses differential pressure testing to test the sealing of gas meter bases. To further improve testing accuracy and reliability, helium mass spectrometry leak detection technology has been introduced into high-standard sealing testing.
[0003] Differential pressure testing can be problematic. During the testing process, an increase in ambient temperature can cause a rise in pressure, while a decrease in temperature can cause a drop in pressure. These pressure changes caused by temperature fluctuations can be mixed with the pressure drops caused by leaks, which can easily lead to misjudgments in differential pressure testing. A differential pressure gauge that is mistakenly judged as "unqualified" due to temperature fluctuations is actually a good product. If it is scrapped or reworked directly, it will result in a huge waste of materials, time, and energy.
[0004] Secondly, helium detection equipment usually exists as a standalone detection device because helium is relatively expensive, and using helium detection alone would lead to excessive costs and waste of initial investment in differential pressure detection equipment. Summary of the Invention
[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.
[0006] In view of the problems existing in the above and / or existing gas meter base meter testing systems and methods, the present invention is proposed.
[0007] Therefore, the problems that this invention aims to solve are the high false alarm rate of differential pressure detection, which leads to low production efficiency, and the increased cost of using helium detection alone.
[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a gas meter base meter testing system, comprising: a differential pressure detection component including a main flow line, a branch flow line fixed on the surface of the main flow line, a differential pressure testing platform fixed on the surface of the branch flow line, a second reversing gripper fixed at the outlet of the branch flow line; a buffer component including a non-conforming line disposed on one side of the second reversing gripper, a conforming line disposed on one side of the non-conforming line, a third line-changing gripper fixed between the non-conforming line and the conforming line; a conveying component including a first line-changing gripper fixed on one side of the conforming line, a re-inspection conforming line fixed on one side of the first line-changing gripper, a re-inspection non-conforming line disposed on one side of the re-inspection conforming line; and a helium detection component including a helium detection robot disposed on one side of the buffer component, a helium detection box disposed on one side of the helium detection robot.
[0009] As a preferred embodiment of the gas meter base detection system of the present invention, wherein: a movable guide is fixed on the surface of the main water line, one end of the movable guide is located at the gripping position of the first reversing gripper, a gripper is fixed at the outlet of the defective line, a first buffer line is fixed on one side of the gripper, a second line-changing gripper is fixed at one end of the first buffer line, and a second buffer line is fixed on one side of the second line-changing gripper.
[0010] As a preferred embodiment of the gas meter base meter testing system of the present invention, wherein: a defective finished meter line is provided on one side of the re-inspection failure line, a qualified finished meter line is provided on one side of the defective finished meter line, a finished meter line to be inspected is provided on one side of the qualified finished meter line, an upper and lower lifting machine is provided at one end of the finished meter line to be inspected, and a qualified finished meter branch line and a defective finished meter branch line are respectively fixed at the output end of the upper and lower lifting machine.
[0011] As a preferred embodiment of the gas meter base meter testing system of the present invention, the surface of the helium detection box is fixed with a matching pipeline, one end of the matching pipeline is fixed with a pump set, and one side of the pump set is fixed with an electrical cabinet.
[0012] As a preferred embodiment of the gas meter base meter testing system of the present invention, the helium detection chamber has an absolute pressure of 20-80 kPa, which is adjustable within this range. The net internal dimensions of the helium detection chamber are 670 (width) × 450 (height) × 170 (depth) mm, and the volume is 51 L. There are four helium detection chambers, and each helium detection chamber tests two workpieces. The helium detection chamber is opened and closed by a vertical lifting door.
[0013] As a preferred embodiment of the gas meter base meter testing system described in this invention, the helium detector has a testing accuracy of 1×10⁻⁶. -6Pa.m3 / s, the opening pressure (inside the vacuum chamber) of the helium detection box is ≤30pa, and the evacuation pressure of the gas meter base is ≤2000pa (pressure adjustable upwards).
[0014] As a preferred embodiment of the detection method of the gas meter base meter detection system of the present invention, the method further includes the following steps: S1, passing the gas meter base meter sequentially through the main flow line and then guided to the branch flow line by a movable guide; S2, passing the gas meter base meter sequentially through the differential pressure test bench, which performs fixing, injection pressure, and pressure holding tests on the gas meter base meter, injecting 75 kPa high pressure and 15 kPa low pressure respectively, and performing differential pressure tests; S3, after the test is completed, the gas meter is moved to the branch flow line by the second reversing gripper and the third reversing gripper. S4. The base meter is placed on the non-conforming line and the conforming line; S5. The non-conforming product is transferred to the first buffer line by the gripper, and then to the second buffer line by the second line-changing gripper; S6. The helium inspection robot grabs the gas meter base meter on the second buffer line and sends it to the helium inspection box for helium inspection; S7. After the helium re-inspection is qualified, the gas meter base meter is grabbed by the helium inspection robot and transferred to the re-inspection qualified line, and then transferred to the qualified line by the first line-changing gripper, flowing into the next process; S8. After the helium re-inspection is unqualified, the gas meter base meter is grabbed by the helium inspection robot and transferred to the re-inspection unqualified line.
[0015] As a preferred embodiment of the detection method of the gas meter base meter detection system of the present invention, in step S1, the gas meter base meter discharged by the active guide is picked up by the first reversing gripper and sent to the branch production line. In step S2, the detection method is: if the pressure before and after is ≤10pa, the sealing performance is considered qualified; otherwise, it is unqualified.
[0016] As a preferred embodiment of the detection method of the gas meter base meter detection system of the present invention, the purpose of setting two buffer lines, a first buffer line and a second buffer line, in step S4 is to enable the second buffer line to better set the interval between the two meters, so as to facilitate the helium detection robot arm to grasp them.
[0017] As a preferred embodiment of the detection method of the gas meter base detection system of the present invention, wherein: the differential pressure detection requirement in S5 is: the pressure inside the gas meter base is higher than that in the helium detection box, and the differential pressure is guaranteed to be less than 75 kPa for the steel shell.
[0018] The beneficial effects of this invention are as follows: By setting up a differential pressure detection component, a buffer component, a conveying component, and a helium detection component, the sealing performance of the gas meter base can be detected. During the detection process, multiple reversing grippers and line-changing grippers work together to automatically switch the workpiece between different detection positions and automatically classify qualified and unqualified products without manual operation. Unqualified products generated by differential pressure detection are re-inspected using helium mass spectrometry technology, which can further quickly screen out qualified products. Since helium detection is only used to identify gas meters that are falsely detected due to temperature fluctuations during differential pressure detection and to identify meters with large fluctuations in readings during the initial and re-calibration of finished meters, the two lines are carried out simultaneously, and qualified products are all integrated into the main line. This saves costs and increases production efficiency by more than 10%. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a structural diagram of a gas meter base meter detection system.
[0021] Figure 2 This is a structural diagram of the differential pressure detection component of a gas meter base meter detection system.
[0022] Figure 3 This is a structural diagram of the cache component of the gas meter base meter detection system.
[0023] Figure 4 This is a structural diagram of the conveying component of a gas meter base meter detection system.
[0024] Figure 5 This is a structural diagram of the helium detection component of a gas meter base meter detection system.
[0025] Figure 6 This is a flowchart of the gas meter base meter testing method.
[0026] Figure 7 This is a flowchart of the helium detection box process for a gas meter base meter testing system.
[0027] Figure 8 This is a schematic diagram of the recovery system principle of the gas meter base meter detection system.
[0028] Figure 9 This is a flowchart illustrating the leak detection and helium recovery process of a gas meter base meter testing system.
[0029] In the diagram: 1. Differential pressure detection component; 11. Main flow line; 12. Branch flow line; 13. Differential pressure detection platform; 14. Second reversing gripper; 15. Activity guide; 16. First reversing gripper; 2. Buffer component; 21. Non-conforming line; 22. Conforming line; 23. Third reversing gripper; 24. Gripper; 25. First buffer line; 26. Second buffer line; 27. Second reversing gripper; 3. Conveying component; 31. First reversing gripper; 32. Re-inspection qualified line; 33. Re-inspection non-conforming line; 34. Non-conforming finished product line; 35. Conforming finished product line; 36. Finished product line to be inspected. 37. Upper and lower hoists; 38. Qualified finished product meter branch line; 39. Unqualified finished product meter branch line; 4. Helium detection assembly; 41. Helium detection robot; 42. Helium detection box; 43. Supporting pipelines; 44. Pump set; 45. Electrical cabinet; 5. Recovery system; 51. High-pressure tank; 52. Compressor; 53. Low-pressure tank; 54. High-purity helium source; 55. Recovery pump; 56. Vacuum pump; 57. Mass spectrometer leak detector; 58. V1 valve; 59. V2 valve; 510. V3 valve; 511. V4 valve; 512. V5 valve; 513. V6 valve; 514. V7 valve. Detailed Implementation
[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.
[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.
[0033] Example 1, referring to Figures 1-5 This is the first embodiment of the present invention, which provides a gas meter base testing system. The gas meter base testing system includes a differential pressure detection component 1, a buffer component 2, a conveying component 3, and a helium detection component 4. By setting up the differential pressure detection component 1, buffer component 2, conveying component 3, and helium detection component 4, the differential pressure detection and helium detection processes are combined. By using multiple reversing grippers and line-changing grippers in cooperation, the workpiece can be automatically switched at different detection positions, and the qualified and unqualified products can be automatically classified without manual operation, which greatly improves the detection efficiency.
[0034] Specifically, the differential pressure detection component 1 includes a main flow line 11, a branch flow line 12 fixed on the surface of the main flow line 11, a differential pressure detection platform 13 fixed on the surface of the branch flow line 12, and a second reversing gripper 14 fixed at the outlet of the branch flow line 12.
[0035] Specifically, the cache component 2 includes a defect line 21 set on one side of the second reversing gripper 14, a qualified line 22 set on one side of the defect line 21, and a third reversing gripper 23 fixed between the defect line 21 and the qualified line 22.
[0036] Specifically, the conveying component 3 includes a first line-changing gripper 31 fixed to one side of the qualified line 22, a re-inspection qualified line 32 fixed to one side of the first line-changing gripper 31, and a re-inspection unqualified line 33 set to one side of the re-inspection qualified line 32.
[0037] Specifically, the helium detection component 4 includes a helium detection robot 41 located on one side of the second buffer line 26, and a helium detection box 42 located on one side of the helium detection robot 41.
[0038] Example 2, refer to Figures 2-7 This is the second embodiment of the present invention, which is based on the previous embodiment.
[0039] Specifically, it also includes a movable guide 15 fixed on the surface of the main flow line 11, one end of the movable guide 15 being located at the gripping position of the first reversing gripper 16, the first reversing gripper 16 being fixed between the main flow line 11 and the branch flow line 12, a gripper 24 being fixed at the outlet of the defective line 21, a first buffer line 25 being fixed on one side of the gripper 24, a second line-changing gripper 27 being fixed at one end of the first buffer line 25, and a second buffer line 26 being fixed on one side of the second line-changing gripper 27.
[0040] Specifically, a non-conforming product line 34 is provided on one side of the non-conforming product line 33, a conforming product line 35 is provided on one side of the non-conforming product line 34, a product line 36 to be inspected is provided on one side of the conforming product line 35, and an upper and lower lifting machine 37 is provided at one end of the product line 36 to be inspected. A conforming product line branch 38 and a non-conforming product line branch 39 are fixed at the output end of the upper and lower lifting machine 37, respectively.
[0041] Specifically, a matching pipeline 43 is fixed to the surface of the helium detection box 42, a pump set 44 is fixed to one end of the matching pipeline 43, and an electrical cabinet 45 is fixed to one side of the pump set 44.
[0042] Pump set 44 includes recovery system pump set, and various vacuum pump, pressurization pump, and nitrogen filling pump set.
[0043] Specifically, the absolute pressure of helium gas in the helium inspection chamber 42 is 20-80 kPa, and the pressure is adjustable within this range. The net internal dimensions of the helium inspection chamber 42 are 670 mm wide × 450 mm high × 170 mm deep, with a volume of 51 L. There are four helium inspection chambers 42, and each helium inspection chamber 42 can inspect two workpieces. The helium inspection chamber 42 has a vertical lifting door for opening and closing.
[0044] Specifically, the helium detector 42 has a detection accuracy of 1×10⁻⁶. -6 Pa.m3 / s, the pressure inside the vacuum chamber of the helium detection box 42 is ≤30pa, and the evacuation pressure of the gas meter base is ≤2000pa, which is adjustable upwards.
[0045] A testing method for a gas meter base meter testing system further includes the following steps: S1, the gas meter base meter is sequentially passed through the main flow line 1, and then transferred to the branch flow line 12 via the movable guide 15; S2, the gas meter base meter is sequentially passed through the differential pressure testing platform 13, which performs fixing, injection pressure, and pressure holding tests on the gas meter base meter, injecting 75 kPa high pressure and 15 kPa low pressure respectively, and performing differential pressure tests; S3, after testing, the gas meter base meter is placed on the non-conforming line 21 and the conforming line 22 via the second reversing gripper 14 and the third line-changing gripper 23; S4, the non-conforming product is transferred to the branch flow line 22 via the gripper 24. On buffer line 25, the gas meter passes through the second line-changing gripper 27 to the second buffer line 26; S5, after passing the helium re-inspection, the gas meter base is picked up by the helium inspection robot 41 and placed on the re-inspection pass line 32, then passes through the first line-changing gripper 31 and merges into the pass line 22, flowing into the next process; S6, the helium inspection robot 41 picks up the gas meter base on the second buffer line 26 and sends it to the helium inspection box 42 for helium inspection; S7, after the operation is completed, the gas meter base that passes the helium re-inspection is picked up by the helium inspection robot 41 and placed on the re-inspection pass line 32, and the gas meter base that fails the helium re-inspection is picked up by the helium inspection robot 41 and placed on the re-inspection failure line 33.
[0046] In a preferred embodiment of the detection method of the gas meter base meter detection system of the present invention, in S1, the gas meter base meter discharged by the active guide 15 is picked up by the first reversing gripper 16 and sent to the branch flow line 12. In S2, the detection method is: if the pressure before and after is ≤10pa, the sealing performance is considered qualified; otherwise, it is unqualified.
[0047] As a preferred embodiment of the detection method of the gas meter base meter detection system of the present invention, in step S4, two buffer lines, a first buffer line 25 and a second buffer line 26, are set to better set the interval between the two meters by the second buffer line 26, so as to facilitate the helium detection robot 41 to grasp them.
[0048] As a preferred embodiment of the detection method of the gas meter base meter detection system of the present invention, wherein: the differential pressure detection requirement in S2 is: the pressure inside the gas meter base meter is higher than that in the helium detection box 42, and the differential pressure is guaranteed to be less than 75 kPa for the steel shell.
[0049] Example 3, referring to Figures 7-9 This is the third embodiment of the present invention, which is based on the first two embodiments.
[0050] The workpiece is charged and discharged at a rate of ≤35Kpa / s, with simultaneous intake or exhaust at the inlet and outlet. The workpiece recovery pressure is ≤2000pa (adjustable). The helium recovery rate is ≥80% (for a 1.2L steel-shell workpiece, one 40L bottle of helium at a pressure of 13.5MPa can test 15,000 fully qualified workpieces, excluding helium waste caused by helium replenishment).
[0051] Cycle time per machine (calculated based on qualified workpieces, excluding robot loading and unloading time): 88 seconds per box for a single helium inspection box at 42 cycles; 22 seconds per box for four helium inspection boxes at 42 cycles (each box inspects 2 workpieces, i.e., 11 seconds per piece) (two machines meet the capacity requirement of 5.5 seconds per piece).
[0052] The helium detection box 42 can operate in four alternating modes, or a single box can operate independently.
[0053] The recovery system mainly includes a high-pressure tank 51, a compressor 52, a low-pressure tank 53, a high-purity helium source 54, a recovery pump 55, a vacuum pump 56, a mass spectrometer leak detector 57, and valves V1, V2, V3, V4, V11, V5, V12, V6, V7, and V8 515. The mass spectrometer leak detector 57 is fixed to the surface of the pump unit 44. The high-pressure tank 51 is connected to the compressor 52 via valve V5 512, and the compressor 52 is connected to the low-pressure tank 53 via valve V4 511. The low-pressure tank 53 is connected to the compressor 52 via valve V1 512. Valve 513 connects to the high-purity helium source 54. Low-pressure tank 53 is connected to recovery pump 55 via pipeline. High-pressure tank 51 is connected to mass spectrometer leak detector 57 via pipeline. Helium detection box 42 and the workpiece being tested are both connected to vacuum pump 56 via valve V7 514. Helium detection box 42 and the workpiece being tested are both connected to low-pressure tank 53 via valve V2 59. Helium detection box 42 and the workpiece being tested are both connected to mass spectrometer leak detector 57 and high-pressure tank 51 via valve V1 58. Valve V8 515 is connected to helium detection box 42. This system can perform large leak detection, helium filling, and helium recovery on the workpiece within a set time.
[0054] Large Leak Detection by Vacuuming and Pressure Holding: During leak detection, first place the workpiece in the helium test chamber 42. After connection, press the start button, and the door of the helium test chamber 42 will automatically close. Open valve V3 510 and close other valves to pre-evacuate the helium test chamber 42. After evacuating the helium test chamber 42 to a certain value, hold the pressure on the workpiece for several seconds. If there is no large leak in the workpiece, the pressure can be maintained. Then continue to evacuate the helium test chamber 42 and the workpiece to the set value. If the pressure cannot be maintained within the set time, it indicates that there is a large leak in the workpiece, and the system will automatically give an audible and visual alarm. At this time, the system needs to be stopped, the reset button should be pressed, the chamber door should be opened, and the workpiece should be removed.
[0055] Micro-leak detection: If there is no major leak in the workpiece, the system automatically opens valve V4 511 to evacuate the workpiece. At this time, the helium detection chamber 42 and the workpiece are evacuated simultaneously. When the pressure in the helium detection chamber 42 reaches 30 Pa and the pressure in the workpiece reaches 2000 Pa, the mass spectrometer leak detector 57 will automatically start, measure the helium background in the current helium detection chamber 42, and record this value. (During leak detection, the system will subtract this background value from the measured leak rate value to ensure that the displayed value is the actual leak rate of the workpiece.) Then, valve V4 511 is closed, valve V5 512 is opened to fill the workpiece with helium, and micro-leak detection is performed on the workpiece. The system automatically judges whether the workpiece is qualified and gives a prompt or audible and visual alarm.
[0056] The system has helium pressure and concentration monitoring and automatic helium replenishment functions. When the system detects that the helium concentration or pressure is lower than the set value, it will automatically open the valve to replenish high-purity helium.
[0057] After evacuating the workpiece by opening valve V7 514, close valve V7 514 and open valve V1 58 to fill the workpiece with helium. Once the specified pressure is reached, close valve V1 58. After leak detection, open valve V2 59, and the high-pressure helium in the workpiece will automatically flow into the low-pressure tank 53. Then close valve V2 59 and open valve V3 510. Use recovery pump 55 to extract the remaining helium in the workpiece and send it into the low-pressure tank 53. When the pressure in the low-pressure tank 53 rises to the preset value, open valves V4 511 and V5 512. Compressor 52 will compress the helium in the low-pressure tank 53 to the high-pressure tank 51. Since 100% recovery is impossible, when the pressure or concentration in the high-pressure tank 51 is lower than the specified value, valve V6 513 needs to be opened to replenish pure helium to maintain sufficient pressure and concentration of helium in the high-pressure tank 51.
[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A gas meter base detection system, characterized in that: include, The differential pressure detection assembly (1) includes a main flow line (11), a branch flow line (12) fixed to the surface of the main flow line (11), a differential pressure detection platform (13) fixed to the surface of the branch flow line (12), a second reversing gripper (14) fixed to the outlet of the branch flow line (12), and, The buffer component (2) includes a defect line (21) disposed on one side of the second reversing gripper (14), a qualified line (22) disposed on one side of the defect line (21), and a third line-changing gripper (23) fixed between the defect line (21) and the qualified line (22). The conveying assembly (3) includes a first line-changing gripper (31) fixed to one side of the qualified line (22), a re-inspection qualified line (32) fixed to one side of the first line-changing gripper (31), and a re-inspection unqualified line (33) provided on one side of the re-inspection qualified line (32). The helium detection component (4) includes a helium detection robot (41) disposed on one side of the buffer component (2), and a helium detection box (42) is disposed on one side of the helium detection robot (41).
2. The gas meter base detection system as described in claim 1, characterized in that: The surface of the main flow line (11) is fixed with a movable guide (15), one end of which is located at the gripping position of the first reversing gripper (16). The first reversing gripper (16) is fixed between the main flow line (11) and the branch flow line (12). The outlet of the defective line (21) is fixed with a gripper (24). A first buffer line (25) is fixed on one side of the gripper (24). A second line-changing gripper (27) is fixed on one end of the first buffer line (25). A second buffer line (26) is fixed on one side of the second line-changing gripper (27).
3. The gas meter base detection system as described in claim 2, characterized in that: A non-conforming product line (34) is provided on one side of the non-conforming product line (34), a qualified product line (35) is provided on one side of the non-conforming product line (34), a product line to be inspected (36) is provided on one side of the qualified product line (35), and an upper and lower lifting machine (37) is provided at one end of the product line to be inspected (36) and the qualified product line (35). A qualified product line branch (38) and a non-conforming product line branch (39) are respectively fixed at the output end of the upper and lower lifting machine (37).
4. The gas meter base detection system as described in claim 3, characterized in that: The surface of the helium detector (42) is fixed with a matching pipeline (43), one end of the matching pipeline (43) is fixed with a pump set (44), and one side of the pump set (44) is fixed with an electrical cabinet (45).
5. The gas meter base detection system as described in claim 4, characterized in that: The helium pressure (absolute pressure) of the helium inspection box (42) is 20-80 kPa (the pressure is adjustable within this range). The net internal dimensions of the helium inspection box (42) are 670 (width) × 450 (height) × 170 (depth) mm, and the volume is 51 L. There are four helium inspection boxes (42), and each helium inspection box (42) can inspect two workpieces. The opening and closing method of the helium inspection box (42) is a vertical lifting door.
6. The gas meter base detection system as described in claim 5, characterized in that: The helium detector (42) has a detection accuracy of 1×10⁻⁶. -6 Pa.m3 / s, the opening pressure (inside the vacuum chamber) of the helium detection box (42) is ≤30pa, and the evacuation pressure of the gas meter base is ≤2000pa (pressure adjustable upwards).
7. A testing method for a gas meter base meter testing system, characterized in that: The gas meter base detection system as described in any one of claims 1-6 further includes the following steps: S1. Pass the gas meter base meter through the main water line (1) in sequence, and then transfer it to the branch water line (12) through the active guide (15). S2. The gas meter base meter passes through the differential pressure test bench (13) in sequence. The differential pressure test bench (13) will fix the gas meter base meter, inject pressure and perform pressure holding test. It injects 75 kPa high pressure and 15 kPa low pressure respectively, and performs differential pressure test. S3. After the test is completed, the gas meter base is placed on the unqualified line (21) and the qualified line (22) by using the second reversing gripper (14) and the third line reversing gripper (23); S4. Non-conforming products are transferred to the first buffer line (25) via the gripper (24), and then to the second buffer line (26) via the second line-changing gripper (27). S5. The helium detection robot (41) grabs the gas meter base on the second buffer line (26) and sends it to the helium detection box (42) for helium detection operation; S6. After passing the helium re-inspection, the gas meter base is picked up by the helium inspection robot (41) and placed on the re-inspection pass line (32). Through the first line changing gripper (31), it is integrated into the pass line (22) and flows into the next process. S7. After the helium re-inspection fails, the gas meter base is picked up by the helium inspection robot (41) and placed on the re-inspection failure line (33).
8. The detection method of the gas meter base meter detection system as described in claim 7, characterized in that: In S1, the gas meter base discharged by the active guide (15) is picked up by the first reversing gripper (16) and sent to the branch flow line (12). In S2, the detection method is: if the pressure before and after is ≤10pa, the sealing is considered qualified; otherwise, it is unqualified.
9. The detection method of a gas meter base meter detection system as described in claim 8, characterized in that: The purpose of setting two cache lines in S4, namely the first cache line (25) and the second cache line (26), is to enable the second cache line (26) to better set the interval between the two tables, so as to facilitate the helium inspection robot (41) to grasp them.
10. The detection method of a gas meter base meter detection system as described in claim 9, characterized in that: The differential pressure detection requirements in S5 are as follows: the pressure inside the gas meter base is higher than that in the helium test chamber (42), and the differential pressure is guaranteed to be less than 75 kPa for the steel shell.