Helium mass spectrum leak detection tool for pneumatic sealing connector

Abstract

The invention relates to the technical field of leak detection tools, in particular to a helium mass spectrometer leak detection tool for a pneumatic sealing connector, which comprises a base, a gas extraction channel, a pressure sensor, a pressure sensor and a pressure sensor, the base is provided with an accommodating groove, and one end of the gas extraction channel is communicated with the bottom wall of the accommodating groove; the supporting plate is connected with the base, and a pressing air cylinder is installed on the supporting plate; the sealing block is connected with a piston rod of the pressing air cylinder, an air supply channel is formed in the sealing block, one end of the air supply channel is connected with a helium input unit, and after the sealing block abuts against the base, an inner cavity of the containing groove communicates with the air supply channel; the gas extraction detection unit is connected with the base and is used for extracting gas in the gas extraction channel and detecting helium flowing into the gas extraction channel; according to the invention, the effect of reducing the detection error on the premise of improving the leakage detection efficiency of the connector is achieved.

Description

Technical Field

[0001] This application relates to the field of leak detection tooling technology, and in particular to a helium mass spectrometry leak detection tooling for a pneumatic sealing connector. Background Technology

[0002] For structures composed of multiple layers, such as metal-glass insulators, the sealing performance between adjacent layers needs to be verified. However, the application scenarios require extremely high airtightness. Therefore, it is necessary to design a leak detection tool to perform airtightness testing on each metal-glass insulator.

[0003] To accurately and quickly test the airtightness of metallic glass insulators, helium mass spectrometry is generally used. The existing "test after installation" mode has significant efficiency bottlenecks. The core problems are reflected in three dimensions: long serial operation process, many manual intervention steps, and inability to process in parallel. Specifically, in batch testing scenarios, the existing technology requires a complete serial process of "independent clamping-calibration-testing-unclamping" for each connector to be tested: First, the connector needs to be manually aligned with the tooling positioning reference (such as positioning pins, sealing grooves), and then fixed by manually tightening multiple clamping bolts or fastening mechanical buckles; after clamping, the sealing surface fit needs to be manually calibrated (such as by checking the gap with a feeler gauge) and the initial position of the helium spray gun needs to be adjusted, further increasing the operation time; after the test is completed, the tooling is disassembled and the connector is taken out, completing the test loop for a single workpiece.

[0004] More importantly, manual installation is unstable and the difference in operator skill can lead to clamping and positioning errors. If the sealing surface is not fully fitted, it needs to be disassembled and re-clamped, forming a vicious cycle of "low efficiency - more rework - even lower efficiency". This is completely incompatible with the core requirements of modern production lines: "high cycle time, low labor intensity, and flexibility". Summary of the Invention

[0005] In order to reduce detection errors while improving connector leak detection efficiency, this application provides a helium mass spectrometry leak detection tooling for pneumatic sealed connectors.

[0006] The helium mass spectrometry leak detection fixture for a pneumatic sealing connector provided in this application adopts the following technical solution: A helium mass spectrometry leak detection fixture for a pneumatic sealing connector includes: A base having a receiving groove and an air extraction channel, one end of which is connected to the bottom wall of the receiving groove. A support plate is connected to the base, and a clamping cylinder is installed on the support plate; A sealing block is connected to the piston rod of the pressing cylinder, and an air supply channel is provided on the sealing block. One end of the air supply channel is connected to a helium input unit, and the sealing block abuts against the base to make the inner cavity of the receiving groove communicate with the air supply channel. A gas extraction detection unit is connected to the base and is used to extract gas from the gas extraction channel and detect helium flowing into the gas extraction channel.

[0007] By adopting the above technical solution, the connector is first placed in the receiving groove, with the lower end face of the connector's glass area abutting against the bottom wall of the receiving groove. Then, the gas in the suction channel is extracted by the suction detection unit, making the suction channel close to a vacuum state. At this time, atmospheric pressure presses the connector and the bottom wall of the receiving groove tightly together. Then, the sealing block is driven by the clamping cylinder to move towards the base until the sealing block and the base abut together, sealing the upper end of the receiving groove. Then, helium is introduced into the gas supply channel by the helium input unit. The helium enters the receiving groove. Since the suction channel is in a vacuum state, the helium in the receiving groove may seep into the suction channel along the interlayer gaps on the connector. At this time, the suction detection unit detects the helium content in the suction channel, thus measuring the connector's leakage rate. After the measurement is completed, the gas pressure in the suction channel returns to normal, and the sealing block is retracted by the clamping cylinder. Then, the connector can be removed from the receiving groove. The designed pneumatic sealing connector helium mass spectrometry leak detection fixture can form a receiving groove and an air extraction channel through the base. The receiving groove can serve as the receiving area for the connector. The air extraction channel and the air extraction detection unit can make the connector and the bottom wall of the receiving groove tightly sealed. The support plate can serve as the mounting base for the clamping cylinder. The sealing block can form an air supply channel and cooperate with the helium input unit to input helium into the receiving groove. The air extraction detection unit can extract the gas in the air extraction channel and detect the helium leaking through the gap between the upper layers of the connector, thereby obtaining the leakage rate of the connector. In the process of connector leakage rate detection, the operator only needs to put the connector into or take it out of the receiving groove. The number of manual steps is reduced, thereby improving the connector leak detection efficiency and reducing detection errors.

[0008] In one specific implementation, the base includes: A base plate, wherein a placement cavity is provided on the base plate; The lower pipe is hollow and forms an air extraction channel, which is connected to the placement cavity, and the lower pipe is connected to the base plate. A contouring replacement head, wherein the contouring replacement head is capable of abutting against the bottom wall of the placement cavity, and the receiving groove is formed on the contouring replacement head.

[0009] By adopting the above technical solution, the designed base can form a placement cavity through the base plate. Through the contouring replacement head, it can form receiving slots of different sizes to adapt to connectors of different specifications. Moreover, it only requires simple replacement of the contouring replacement head. Through the lower pipe, it can be connected to the air extraction detection unit to realize the extraction of gas in the air extraction channel.

[0010] In one specific implementation, a sealing ring is embedded in the sealing block, and the sealing ring is capable of abutting against the base.

[0011] By adopting the above technical solution, the designed sealing ring can improve the sealing performance of the receiving groove on the upper side of the connector after the sealing block and the base come into contact, and reduce the possibility of helium leakage.

[0012] In one specific implementation, the air extraction detection unit includes: A vacuum pump, wherein the vacuum pump is connected to the suction channel via a suction pipe; A helium mass spectrometer, wherein the detection end of the helium mass spectrometer extends into the gas extraction channel, and the base and vacuum pump are both connected to the helium mass spectrometer.

[0013] By adopting the above technical solution, the designed gas extraction detection unit can extract gas from the gas extraction channel using a vacuum pump, and detect the helium content leaking through the interlayer structure of the connector using a helium mass spectrometer after the gas extraction channel is in a vacuum environment, thereby measuring the leakage rate of the connector.

[0014] In one specific implementation scheme, the automatic feeding unit includes: Rotate the lifting plate; Multiple hanging rods are evenly distributed around the circumference of the rotating lifting plate, and the hanging rods are connected to the rotating lifting plate. The end of the hanging rod away from the rotating lifting plate is provided with a clamping hole and multiple air holes. After the rotating lifting plate rotates, the clamping hole can be coaxially arranged with the receiving groove, and a sink groove adapted to the thickness of the hanging rod is formed on the base. A rotating lifting drive mechanism is connected to the rotating lifting plate, which is used to make the rotating lifting plate rotate around its own vertical axis and move up and down in the vertical direction.

[0015] By adopting the above technical solution, the designed automatic feeding unit can use the rotating lifting plate as the mounting base for multiple hanging rods. The clamping holes on the hanging rods can clamp the connectors, and the air vents allow helium gas in the air supply channel to enter the receiving tank. The rotating lifting drive mechanism can realize the insertion and removal of the connectors in the receiving tank. Furthermore, while testing is being performed, manual operation can be carried out on the connectors in other feeding areas, further improving the leak detection efficiency of the connectors.

[0016] In one specific implementation, the diameter of the vent hole gradually decreases from top to bottom, and the minimum diameter of the vent hole is smaller than the outer diameter of the connector center rod.

[0017] By adopting the above technical solution, the design of the gas passage with a gradually decreasing aperture from top to bottom can prevent workers from accidentally inserting the connector into the gas passage while allowing helium to pass through.

[0018] In one specific implementation, the clamping hole is a blind hole with its opening facing downwards, and an air vent is formed on the hole wall of the clamping hole. The clamping hole is stepped, wider at the bottom and narrower at the top. When the top wall of the connector center rod abuts against the stepped surface, a gap is left between the hanging rod and the glass area of ​​the connector.

[0019] By adopting the above technical solution, the clamping hole designed as a blind hole can leave a gap between the connector glass area and the hanging rod through a stepped design, thereby limiting the extreme position of the connector in the vertical direction while preventing the connector from blocking the air passage.

[0020] In one specific implementation scheme, a pneumatic controller is connected to the rotating lifting plate, and a discharge air passage is formed on the hanging rod. The working end of the pneumatic controller is connected to the discharge air passage, and the discharge air passage is connected to the top wall of the clamping hole.

[0021] By adopting the above technical solution, the designed air pressure controller can control the air pressure in the unloading air path, thereby realizing the adsorption and fixation of the connector or the automatic detachment of the connector after detection.

[0022] In one specific implementation scheme, the rotational lifting drive mechanism includes: A lifting cylinder, wherein the piston rod of the lifting cylinder is vertically axially arranged; Mounting plate, the mounting plate is connected to the piston rod of the lifting cylinder, and a fixing rod is connected to the mounting plate. One end of the fixing rod extends into the inner cavity of the rotating lifting plate and is connected to the air pressure controller. A rotating sleeve is rotatably connected to the mounting plate, and the rotation axis of the rotating sleeve coincides with the central axis of the fixed rod. The rotating sleeve is also connected to the rotating lifting plate.

[0023] By adopting the above technical solution, the designed rotary lifting drive mechanism can drive the mounting plate to rise and fall vertically through the lifting cylinder. The mounting plate can serve as the mounting base for the fixed rod and the rotating sleeve. The fixed rod can fix the air pressure controller, and the rotating sleeve can drive the rotary lifting plate to rotate.

[0024] In one specific implementation, the pneumatic controller has an air outlet and multiple air extraction ports, and both the air outlet and the air extraction ports of the pneumatic controller can be connected to the unloading air path.

[0025] By adopting the above technical solution, the connector can be automatically disconnected after the test is completed.

[0026] In one specific implementation, sealing strips are embedded in the grooves of both the sealing block and the base, and the sealing strips are able to abut against the hanging rod.

[0027] By adopting the above technical solution, the designed sealing strip can improve the airtightness between the sealing block, the base, and the hanging rod while the sealing block and the base are in contact, thus reducing the possibility of helium leakage.

[0028] In summary, this application includes at least one of the following beneficial technical effects: 1. The designed pneumatic sealing connector helium mass spectrometry leak detection fixture features a base that forms a receiving groove and an extraction channel. The receiving groove serves as the connector's receiving area. The extraction channel, in conjunction with the extraction detection unit, ensures a tight seal between the connector and the bottom wall of the receiving groove. A support plate serves as the mounting base for a clamping cylinder. A sealing block forms an air supply channel that, in conjunction with a helium input unit, supplies helium into the receiving groove. The extraction detection unit extracts gas from the extraction channel and detects helium leaking through gaps between the upper layers of the connector, thus obtaining the connector's leakage rate. Furthermore, during the connector leakage rate detection process, manual intervention is minimal; simply placing or removing the connector from the receiving groove reduces manual involvement, thereby improving connector leak detection efficiency while minimizing detection errors.

[0029] 2. The designed pneumatic sealing connector helium mass spectrometry leak detection fixture can form a placement cavity through the base plate. Through the contour replacement head, it can form receiving grooves of different sizes to adapt to connectors of different specifications. Moreover, only the contour replacement head needs to be replaced. Through the lower pipe, it can be connected to the gas extraction detection unit to realize the extraction of gas in the gas extraction channel.

[0030] 3. The designed pneumatic sealing connector helium mass spectrometry leak detection fixture can serve as the mounting base for multiple hanging rods by rotating the lifting plate. The connectors can be clamped through the clamping holes on the hanging rods, and the helium gas in the gas supply channel can be easily introduced into the receiving tank through the gas passage hole. The insertion and removal of the connectors in the receiving tank can be realized by rotating the lifting drive mechanism. In addition, the connectors can be manually loaded in other loading areas while the test is being performed, further improving the leak detection efficiency of the connectors. Attached Figure Description

[0031] Figure 1This is a schematic diagram of the structure of the pneumatic sealing connector in the embodiments of this application.

[0032] Figure 2 This is a schematic diagram of the structure of the helium mass spectrometry leak detection tooling for the pneumatic sealing connector in an embodiment of this application.

[0033] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure.

[0034] Figure 4 Is Figure 2 A schematic diagram of the structure after adding an air extraction detection unit to the basic structure.

[0035] Figure 5 Is Figure 4 A schematic diagram of the structure after adding an automatic feeding unit to the basic structure.

[0036] Figure 6 yes Figure 5 A schematic diagram of the automatic feeding unit and the contouring replacement head.

[0037] Figure 7 yes Figure 6 The sectional view in the image.

[0038] Figure 8 yes Figure 7 A partial structural diagram.

[0039] Explanation of reference numerals in the attached drawings: 01, Connector center rod; 02, Connector glass area; 03, Connector metal area; 1, Base; 11, Base plate; 12, Lower connecting pipe; 121, Air extraction channel; 13, Contouring replacement head; 131, Receiving groove; 2, Support plate; 3, Clamping cylinder; 4, Sealing block; 41, Air supply channel; 42, Sealing ring; 5, Air extraction detection unit; 51, Vacuum pump; 52, Helium mass spectrometer; 6, Automatic feeding unit; 61, Rotating lifting plate; 62, Hanging rod; 621, Clamping hole; 622, Air passage hole; 63, Rotating lifting drive mechanism; 631, Lifting cylinder; 632, Mounting plate; 633, Fixing rod; 634, Rotating sleeve; 7, Air pressure controller; 8, Unloading air path. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0041] This application discloses a helium mass spectrometry leak detection tooling for a pneumatic sealing connector.

[0042] Reference Figure 1The pneumatic sealing connector includes a connector center rod 01, a connector glass area 02, and a connector metal area 03. The connector center rod 01, connector glass area 02, and connector metal area 03 are coaxially arranged and arranged sequentially from the inside to the outside.

[0043] Reference Figures 2 to 3 A pneumatic sealing connector helium mass spectrometry leak detection fixture includes a base 1, a support plate 2, and a clamping cylinder 3. The base 1 has a receiving groove 131 with an opening in the top wall. The base 1 also has an air extraction channel 121, one end of which is connected to the bottom wall of the receiving groove 131. The inner diameter of the air extraction channel 121 is smaller than the inner diameter of the receiving groove 131, thus forming a placement step surface. The bottom wall of the connector glass area 02 can abut against the placement step surface. The support plate 2 is fixedly connected to the base 1 and is vertically arranged. The clamping cylinder 3 is bolted to the support plate 2, and the piston rod of the clamping cylinder 3 is axially parallel to the central axis of the receiving groove 131.

[0044] Reference Figure 3 Specifically, the base 1 includes a base plate 11, a lower connecting pipe 12, and a contoured replacement head 13. The base plate 11 has a placement cavity. The lower connecting pipe 12 is bolted to the base plate 11, and the lower connecting pipe 12 is hollow and forms an air extraction channel 121. The air extraction channel 121 communicates with the placement cavity. The contoured replacement head 13 is placed in the placement cavity and can abut against the bottom wall of the placement cavity. A receiving groove 131 is formed on the contoured replacement head 13. The base plate 11 can form a placement cavity, and the contoured replacement head 13 can form receiving grooves 131 of different sizes to adapt to connectors of different specifications. Only the contoured replacement head 13 needs to be replaced.

[0045] Reference Figure 3 and Figure 4 Furthermore, it also includes a sealing block 4, a helium input unit, and a gas extraction detection unit 5. The sealing block 4 is bolted to the piston rod of the clamping cylinder 3, and a gas delivery channel 41 is provided on the sealing block 4. One end of the gas delivery channel 41 is connected to the gas delivery end flange of the helium input unit. After the sealing block 4 abuts against the base 1, it can connect the inner cavity of the receiving groove 131 and the gas delivery channel 41 to form a sealed environment. In order to improve the sealing performance, a sealing ring 42 is embedded on the sealing block 4, and the sealing ring 42 can abut against the base 1. In this application, in order to reduce the waste of helium, the helium input unit also has a helium extraction function, that is, after the detection is completed, the helium in the receiving groove 131 and the gas delivery channel 41 can be extracted. The gas extraction detection unit 5 is connected to the base 1, and the odor detection unit is used to extract the gas in the gas extraction channel 121 and detect the helium that seeps into the gas extraction channel 121 through the gap of the connector layer structure.

[0046] Reference Figure 3 and Figure 4 Furthermore, the gas extraction detection unit 5 includes a vacuum pump 51 and a helium mass spectrometer 52. The vacuum pump 51 is connected to the lower pipe 12 via a gas extraction pipe and is also connected to the gas extraction channel 121. It is used to extract the gas in the gas extraction channel 121 to bring it close to a vacuum environment. The detection end of the helium mass spectrometer 52 extends into the gas extraction channel 121, and both the lower pipe 12 and the vacuum pump 51 are bolted to the helium mass spectrometer 52. The vacuum pump 51 can extract the gas in the gas extraction channel 121, and the helium mass spectrometer 52 can detect the helium content leaking through the interlayer structure of the connector after the gas extraction channel 121 is in a vacuum environment, thereby measuring the leakage rate of the connector.

[0047] Reference Figure 5 and Figure 6 Based on the aforementioned solution, to further improve the leak detection efficiency and accuracy of the connector, an automatic feeding unit 6 is also included. The automatic feeding unit 6 includes a rotating lifting plate 61, hanging rods 62, and a rotating lifting drive mechanism 63. Multiple hanging rods 62 are evenly distributed around the circumference of the rotating lifting plate 61, and are welded and fixed to the rotating lifting plate 61. The end of the hanging rod 62 furthest from the rotating lifting plate 61 has a clamping hole 621 and multiple air vents 622. The clamping hole 621 is used to supply material to the connector center rod 01. The material is inserted and clamped, and the rotating lifting plate 61 can make the clamping hole 621 and the receiving groove 131 coaxially set after rotation. The contour replacement head 13 has a sink groove that matches the thickness of the hanging rod 62. That is, when the bottom wall of the hanging rod 62 overlaps with the bottom wall of the sink groove, the connector glass area 02 abuts against the bottom wall of the receiving groove 131. The gas in the suction channel 121 can be extracted by the vacuum pump 51. The helium mass spectrometer 52 can detect the helium content that leaks through the interlayer structure of the connector after the suction channel 121 is in a vacuum environment, thereby measuring the leakage rate of the connector.

[0048] Reference Figure 6 and Figure 7The space of the vent 622 gradually decreases from top to bottom, and the minimum diameter of the vent 622 is smaller than the outer diameter of the connector center rod 01. The vent 622, with its gradually decreasing diameter from top to bottom, allows helium gas to pass through while preventing workers from accidentally inserting the connector into the vent 622. The clamping hole 621 is a blind hole with its opening facing downwards, and an exhaust recess is formed on the hole wall of the clamping hole 621 to allow the connector center rod 01 to be smoothly inserted into the clamping hole 621. The clamping hole 621 is stepped, wider at the bottom and narrower at the top. When the top wall of the connector center rod 01 abuts against the stepped surface, there is still a gap between the hanging rod 62 and the connector glass area 02. By designing the clamping hole 621 as a blind hole, the stepped design allows a gap to be left between the connector glass area 02 and the hanging rod 62, thereby limiting the extreme position of the connector in the vertical direction while preventing the connector from blocking the vent 622.

[0049] Reference Figure 6 and Figure 7 Furthermore, a pneumatic controller 7 is connected to the rotating lifting plate 61, and a discharge air passage 8 is formed on the hanging rod 62. The working end of the pneumatic controller 7 is connected to the discharge air passage 8, and the discharge air passage 8 is connected to the top wall of the inner cavity of the clamping hole 621. After the connector center rod 01 is inserted into the inner cavity of the clamping hole 621, the air pressure in the clamping hole 621 is reduced by the pneumatic control component, which can reduce the possibility of the connector detaching from the clamping hole 621.

[0050] Reference Figure 6 and Figure 7 Furthermore, the rotary lifting drive mechanism 63 is connected to the rotary lifting plate 61 and also to the body of the helium mass spectrometer 52. It is used to cause the rotary lifting plate 61 to rotate around its vertical axis and move vertically. Specifically, the rotary lifting drive mechanism 63 includes a lifting cylinder 631, a mounting plate 632, a fixing rod 633, and a rotating sleeve 634. The lifting cylinder 631 is connected to the body of the helium mass spectrometer 52, and the piston rod of the lifting cylinder 631 is axially vertically positioned. The mounting plate 632 is bolted to the piston rod of the lifting cylinder 631, and the fixing rod 633 is bolted to the mounting plate 632. Plate 632 is vertically connected, and the fixing rod 633 and the piston rod of the lifting cylinder 631 are coaxially arranged. One end of the fixing rod 633 extends into the inner cavity of the rotating lifting plate 61 and is connected to the air pressure controller 7, that is, the air pressure controller 7 and the rotating lifting plate 61 can achieve relative rotation. The rotating sleeve 634 is rotatably connected to the mounting plate 632, and the rotating sleeve 634 and the fixing rod 633 are coaxially arranged. The rotating sleeve 634 is welded and fixed to the rotating lifting plate 61. In this application, the rotation of the rotating sleeve 634 can be achieved by a motor, gears and gear rings, or by other structures that can precisely control the rotation angle.

[0051] Reference Figure 7 and Figure 8 The air pressure controller 7 has an air outlet and multiple air extraction ports. Both the air outlet and the air extraction ports of the air pressure controller 7 can be connected to the unloading air passage 8. After the connector center rod 01 is inserted into the clamping hole 621 and rotates with the rotating lifting plate 61, the unloading air passage 8 will connect with the air extraction ports during the rotation. In other words, when the hanging rod 62 is in the loading position, the unloading air passage 8 will connect with the air extraction ports. At this time, the gas in the clamping hole 621 is extracted. Since the gap between the air extraction port of the air pressure controller 7 and the unloading air passage 8 on the rotating lifting plate 61 is small, the air pressure in the unloading air passage 8 will remain below atmospheric pressure for a certain period of time, thereby reducing the possibility of the connector falling off. When the hanging rod 62 is in the unloading position, the unloading air passage 8 will connect with the air outlet, thereby blowing the connector center rod 01 out of the clamping hole 621.

[0052] The implementation principle of the helium mass spectrometry leak detection tool for a pneumatic sealing connector according to an embodiment of this application is as follows: First, the connector is placed in the receiving groove 131, and the lower end face of the glass area 02 of the connector abuts against the bottom wall of the receiving groove 131. Then, the gas in the suction channel 121 is extracted by the suction detection unit 5, making the suction channel 121 close to a vacuum state. At this time, the atmospheric pressure presses the connector and the bottom wall of the receiving groove 131 tightly. Then, the sealing block 4 is driven by the clamping cylinder 3 to move towards the base 1 until the sealing block 4 and the base 1 abut against each other and the upper end of the receiving groove 131 is sealed. Then, helium is input into the gas supply channel 41 by the helium input unit. The helium enters the receiving groove 131. Since the suction channel 121 is in a vacuum state, the helium in the receiving groove 131 may seep into the suction channel 121 along the interlayer gaps on the connector. At this time, the suction detection unit 5 detects the helium content in the suction channel 121, and the leakage rate of the connector can be measured. After the measurement is completed, the suction channel 121 is closed. Once the internal air pressure returns to normal, the sealing block 4 is retracted by the clamping cylinder 3, and then the connector can be removed from the receiving groove 131. The base 1 forms the receiving groove 131 and the air extraction channel 121. The receiving groove 131 serves as the receiving area for the connector. The air extraction channel 121, in conjunction with the air extraction detection unit 5, ensures a tight seal between the connector and the bottom wall of the receiving groove 131. The support plate 2 serves as the mounting base for the clamping cylinder 3. The sealing block 4 forms the air supply channel 41, which, in conjunction with the helium input unit, supplies helium into the receiving groove 131. The air extraction detection unit 5 extracts the gas from the air extraction channel 121 and detects the helium leaking through the gaps between the upper layers of the connector, thereby obtaining the connector's leakage rate. Furthermore, during the connector leakage rate detection process, the operator only needs to place or remove the connector from the receiving groove 131, minimizing manual intervention and thus reducing detection errors while improving connector leak detection efficiency.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A helium mass spectrometry leak detection fixture for a pneumatic sealing connector, characterized in that: include: A base (1) is provided with a receiving groove (131) and an air extraction channel (121) is provided on the base (1), one end of which is connected to the bottom wall of the receiving groove (131). Support plate (2), the support plate (2) is connected to the base (1), and a clamping cylinder (3) is installed on the support plate (2); A sealing block (4) is connected to the piston rod of the pressing cylinder (3), and an air supply channel (41) is provided on the sealing block (4). One end of the air supply channel (41) is connected to a helium input unit, and the sealing block (4) abuts against the base (1) so that the inner cavity of the receiving groove (131) is connected to the air supply channel (41). The gas extraction detection unit (5) is connected to the base (1) and is used to extract the gas in the gas extraction channel (121) and detect the helium flowing into the gas extraction channel (121).

2. The helium mass spectrometry leak detection fixture for pneumatic sealing connectors according to claim 1, characterized in that: The base (1) includes: A base plate (11) is provided with a placement cavity; The lower pipe (12) is hollow and forms an air extraction channel (121). The air extraction channel (121) is connected to the placement cavity, and the lower pipe (12) is connected to the base plate (11). The contouring replacement head (13) is capable of abutting against the bottom wall of the placement cavity, and the receiving groove (131) is formed on the contouring replacement head (13).

3. The helium mass spectrometry leak detection fixture for pneumatic sealing connectors according to claim 1, characterized in that: A sealing ring (42) is embedded on the sealing block (4), and the sealing ring (42) can abut against the base (1).

4. The helium mass spectrometry leak detection fixture for pneumatic sealing connectors according to claim 1, characterized in that: The air extraction detection unit (5) includes: A vacuum pump (51) is connected to the suction channel (121) via a suction pipe; A helium mass spectrometer (52) is provided, with its detection end extending into the gas extraction channel (121), and both the base (1) and the vacuum pump (51) are connected to the helium mass spectrometer (52).

5. The helium mass spectrometry leak detection fixture for pneumatic sealing connectors according to any one of claims 1-4, characterized in that: It also includes an automatic feeding unit (6), which includes: Rotate the lifting plate (61); Multiple hanging rods (62) are evenly distributed around the circumference of the rotating lifting plate (61), and the hanging rods (62) are connected to the rotating lifting plate (61). The end of the hanging rod (62) away from the rotating lifting plate (61) is provided with a clamping hole (621) and multiple air holes (622). After the rotating lifting plate (61) rotates, the clamping hole (621) can be coaxially arranged with the receiving groove (131), and a sink groove adapted to the thickness of the hanging rod (62) is formed on the base (1). A rotating lifting drive mechanism (63) is connected to the rotating lifting plate (61) and is used to make the rotating lifting plate (61) rotate around its own vertical axis and move up and down in the vertical direction.

6. The helium mass spectrometry leak detection fixture for pneumatic sealing connectors according to claim 5, characterized in that: The diameter of the vent (622) gradually decreases from top to bottom, and the minimum diameter of the vent (622) is smaller than the outer diameter of the connector center rod (01).

7. The helium mass spectrometry leak detection fixture for pneumatic sealing connectors according to claim 5, characterized in that: The clamping hole (621) is a blind hole with the opening facing downwards. A venting recess is formed on the hole wall of the clamping hole (621). The clamping hole (621) is stepped with a wider bottom and a narrower top. When the top wall of the connector center rod (01) abuts against the stepped surface, there is a gap between the hanging rod (62) and the connector glass area (02).

8. The helium mass spectrometry leak detection fixture for pneumatic sealing connectors according to claim 7, characterized in that: A pneumatic controller (7) is connected to the rotating lifting plate (61), and a discharge air passage (8) is formed on the hanging rod (62). The working end of the pneumatic controller (7) is connected to the discharge air passage (8), and the discharge air passage (8) is connected to the top wall of the clamping hole (621).

9. The helium mass spectrometry leak detection fixture for pneumatic sealing connectors according to claim 8, characterized in that: The rotation lifting drive mechanism (63) includes: A lifting cylinder (631) has its piston rod axially vertically arranged. Mounting plate (632), the mounting plate (632) is connected to the piston rod of the lifting cylinder (631), and a fixing rod (633) is connected on the mounting plate (632). One end of the fixing rod (633) extends into the inner cavity of the rotating lifting plate (61) and is connected to the air pressure controller (7). Rotary sleeve (634) is rotatably connected to the mounting plate (632), and the rotation axis of the rotating sleeve (634) coincides with the central axis of the fixed rod (633). The rotating sleeve (634) is connected to the rotating lifting plate (61).

10. The helium mass spectrometry leak detection fixture for a pneumatic sealing connector according to claim 9, characterized in that: The air pressure controller (7) has an air outlet and multiple air extraction ports, and both the air outlet and the air extraction ports of the air pressure controller (7) can be connected to the unloading air path (8).

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