Detection system for detecting air tightness

Abstract

The utility model discloses a detection system for detecting air tightness. The detection system comprises a crimping device, a crimping device carrier, an air tightness detection device and a working condition rack, the crimping device comprises a mounting plate, a first crimping part and a second crimping part, and the crimping device carrier can drive the crimping device to do lifting motion; the air tightness detection device is installed on the working condition rack and comprises a pressure gauge, a first control switch and a second control switch, the second control switch is a pneumatic control switch, and the first control switch is connected in an air path among the first crimping part, the control end of the second control switch and the positive pressure source; the second control switch is connected in an air path between the second crimping part and the negative pressure source, and the pressure gauge is located in the air path where the second crimping part is located. Based on the detection system, the device to be detected can be rapidly and accurately detected.

Description

TECHNICAL FIELD

[0001] The utility model relates to airtightness detection technical field especially relates to a detection system for detecting airtightness. BACKGROUND

[0002] In some manufacturing processes of industrial devices, the airtightness check is crucial, and the airtightness is directly related to the final manufacturing quality and long-term safety of the device. Good airtightness can ensure the stability and consistency of the quality of the device during the manufacturing process, reduce production interruptions and material waste, and reduce additional costs caused by maintenance. If the airtightness of the device is poor, it will not only affect the performance of the device, but also may cause safety hazards.

[0003] For example, in the battery capacity forming process, a negative pressure module is needed to perform negative pressure extraction on the battery to detect the airtightness of the battery. Since the battery usually contains electrolyte inside, if the airtightness is poor, it may cause electrolyte leakage, which not only affects the performance of the battery, but also may cause safety hazards. Nowadays, the work flow of the battery from production to production is usually completed on a logistics line, and the battery to be detected is placed in a closed restraint tray, the restraint tray is tightly pressed with the negative pressure module, and the negative pressure source performs negative pressure extraction on the battery to be detected through the negative pressure module to realize airtightness detection.

[0004] Since the negative pressure module, the restraint tray and the battery to be detected are conveyed through the logistics line, the airtightness detection must be rapid and accurate, rapid specifically means that the airtightness detection can be quickly completed, and accurate specifically means that the detection equipment must be closely attached to the negative pressure module to ensure the accuracy of the airtightness detection result. In actual production, the speed of the logistics line movement will be changed many times according to actual needs, and the test based on pure electric control has slow response speed and is not convenient for synchronization with the movement of the logistics line, so it is difficult to ensure the detection speed; at the same time, facing different specifications of the battery to be detected, the corresponding negative pressure module and restraint tray of different specifications are also different, which requires the airtightness detection system to adapt to different specifications of the detection device to realize accurate detection of the battery to be detected. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a detection system for detecting airtightness which can rapidly and accurately detect the airtightness of the device to be detected on the logistics line.

[0006] In order to realize the above-mentioned purpose, the utility model discloses a detection system for detecting airtightness, which comprises a pressure contactor, a pressure contactor carrier, an airtightness detection device and a working condition rack.

[0007] The crimping device comprises a mounting plate, a first crimping piece and a second crimping piece, the first crimping piece and the second crimping piece are respectively used for crimping to a positive pressure interface and a negative pressure interface of a negative pressure module connected with a device to be detected, the first crimping piece and the second crimping piece are arranged on the mounting plate, the mounting plate is mounted on a crimping device carrier, the crimping device carrier is mounted on the working condition rack, and the crimping device carrier can drive the crimping device to move up and down.

[0008] The air tightness detection device is mounted on the working condition rack, and comprises a pressure gauge, a first control switch and a second control switch, the second control switch is an air control switch, the first control switch is connected in a gas path between the first crimping piece, a control end of the second control switch and a positive pressure source, the second control switch is connected in a gas path between the second crimping piece and a negative pressure source, and the pressure gauge is located in the gas path where the second crimping piece is located.

[0009] The first crimping piece is used for applying positive pressure provided by the positive pressure source to the positive pressure interface, so as to open an air flow channel between the negative pressure module and the device to be detected.

[0010] The second crimping piece is used for drawing negative pressure on the negative pressure interface, and the pressure gauge is used for detecting a negative pressure value in the gas path where the second crimping piece is located.

[0011] Optionally, the crimping device carrier comprises a rack fixing plate, a sub-carrier, an extension structure, an extension connecting rod and a guide structure, the rack fixing plate is mounted on the working condition rack, the mounting plate is mounted on the sub-carrier, a fixed end of the guide structure is mounted on the rack fixing plate, a telescopic end of the guide structure is fixedly connected with the sub-carrier through the rack fixing plate, the extension connecting rod is fixed to the sub-carrier, a fixed end of the extension structure is mounted on the rack fixing plate, and a telescopic end of the extension structure is connected with the extension connecting rod through the rack fixing plate, and the extension structure can drive the sub-carrier to move up and down through the extension connecting rod.

[0012] Optionally, a first adjusting valve for adjusting positive pressure is further arranged in a gas path between the positive pressure source and the first control switch, and a second adjusting valve for adjusting negative pressure is further arranged in a gas path between the negative pressure source and the second control switch.

[0013] Optionally, the air tightness detection device further comprises a third control switch and a first filter, the second crimping piece is further connected through the pressure gauge and the third control switch, and the third control switch is connected with the first filter.

[0014] Optionally, a second filter for gas-liquid separation is arranged in the gas path between the pressure gauge and the second pressure contact.

[0015] Optionally, the detection system further comprises a clamping member for clamping the negative pressure module, and the clamping member is mounted on the sub-carriage or the mounting plate.

[0016] Optionally, the detection system further comprises a photoelectric sensing frame and a photoelectric sensor for detecting the lifting position of the sub-carriage, wherein the photoelectric sensing frame is mounted on the rack fixing plate, and the photoelectric sensor is mounted on the sub-carriage.

[0017] Optionally, a positioning pin is arranged on the sub-carriage.

[0018] Optionally, the detection system further comprises an upper cover plate fixedly mounted on the working condition rack, and an electric cabinet and a wire slot are arranged on the upper cover plate.

[0019] Further, the detection system further comprises a drag chain fixing seat and a drag chain slidingly connected to the drag chain fixing seat, one end of the drag chain fixing seat is mounted on the sub-carriage, the other end of the drag chain fixing seat is mounted on the upper cover plate, and the drag chain passes through the upper cover plate along with the drag chain fixing seat.

[0020] Compared with the prior art, the detection system for detecting air tightness comprises a pressure contactor, a pressure contactor carriage, an air tightness detection device and a working condition rack, wherein the pressure contactor carries a first pressure contactor and a second pressure contactor through a mounting plate, and is driven to move up and down by the pressure contactor carriage, so as to accurately press the negative pressure module and the device to be detected of different sizes and shapes, has good adaptability, and provides guarantee for accurate air tightness detection. The air tightness detection device integrates a pressure gauge, a first control switch and a second control switch, and through the gas control of the positive pressure source, the air flow channel between the negative pressure module and the device to be detected is opened, and the device to be detected is tested under negative pressure. The detection is synchronized with the movement of the logistics line, so as to improve the detection speed and ensure the accuracy and efficiency of the test results. The detection system can automatically complete the whole detection process when the device to be detected on the logistics line arrives, reduces the manual operation link, improves the detection efficiency, and reduces the detection cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure front view of the detection system for detecting air tightness.

[0022] Figure 2 It is a structure back view of the detection system for detecting air tightness.

[0023] Figure 3The utility model discloses a structure schematic drawing of the crimping device of the detection system for detecting air tightness for the embodiment of the utility model.

[0024] Figure 4 The utility model discloses a structure enlarged view of the crimping device of the detection system for detecting air tightness for the embodiment of the utility model.

[0025] Figure 5 The utility model discloses a structure enlarged view of the crimping device of the detection system for detecting air tightness for the embodiment of the utility model.

[0026] Figure 6 The utility model discloses a structure enlarged view of the crimping device of the detection system for detecting air tightness for the embodiment of the utility model.

[0027] Figure 7 The utility model discloses a structure enlarged view of the crimping device of the detection system for detecting air tightness for the embodiment of the utility model.

[0028] Figure 8 The utility model discloses a structure enlarged view of the crimping device of the detection system for detecting air tightness for the embodiment of the utility model. Specific implementation

[0029] For the technical content, construction features, realized purpose and effect of the utility model, the following will be explained in detail in combination with the embodiment and the drawing.

[0030] The utility model discloses a kind of detection system for detecting air tightness, to realize the air tightness detection of rapid and accurate to device on logistics line for detection. Figures 1 to 3 , the detection system for detecting air tightness includes crimping device 1, crimping device carrier 2, air tightness detection device 3 and working condition rack 4.

[0031] Among them, crimping device 1 includes mounting plate 11, first crimping piece 12 and second crimping piece 13, first crimping piece 12 and second crimping piece 13 are respectively used to crimp to the positive pressure interface and negative pressure interface of negative pressure module, negative pressure module and device for detection are connected, first crimping piece 12 and second crimping piece 13 are arranged on mounting plate 11, mounting plate 11 is installed on crimping device carrier 2, crimping device carrier 2 is installed on working condition rack 4, crimping device carrier 2 can drive crimping device 1 lifting movement.

[0032] Air tightness detection device 3 is installed on working condition rack 4, air tightness detection device 3 includes pressure gauge 31, first control switch 32 and second control switch 33, second control switch 33 is pneumatic control switch, first control switch 32 is connected in the gas path between the control end of first crimping piece 12, second control switch 33 and positive pressure source, second control switch 33 is connected in the gas path between second crimping piece 13 and negative pressure source, and pressure gauge 31 is located in the gas path of second crimping piece 13.

[0033] The first pressure contact 12 is used to apply positive pressure provided by a positive pressure source to the positive pressure interface, so as to open the air flow channel between the negative pressure module and the device to be detected;

[0034] The second pressure contact 13 is used to draw negative pressure on the negative pressure interface, and the pressure gauge 31 is used to detect the negative pressure value in the air path where the second pressure contact 13 is located.

[0035] In the embodiment, the device to be detected is a battery connected with the negative pressure module, the battery is installed in the restraint tray, and the detection system is docked with the negative pressure interface and the positive pressure interface of the negative pressure module. During the detection process, the positive pressure gas of the positive pressure source is connected to the negative pressure module through the positive pressure interface, so as to open the air flow channel between the negative pressure module and the battery, so that the negative pressure source can draw negative pressure on the battery through the negative pressure interface, the negative pressure module and the opened air flow channel, so as to realize the detection of the air tightness of the battery. Optionally, the first control switch 32 can be an electromagnetic valve, and the pressure gauge 31 can be arranged on a manifold block.

[0036] Compared with the prior art, the detection system for detecting air tightness provided by the utility model mainly comprises a pressure contact 1, a pressure contact carrier 2, a highly integrated air tightness detection device 3 and a working condition rack 4. The pressure contact 1 is driven by the pressure contact carrier 2, so as to realize accurate control of the lifting movement, and the pressure contact 1 can be adjusted according to the specifications of the battery, the negative pressure module and the restraint tray, so as to ensure that stable and accurate pressure contact operation can be realized regardless of the specifications of the battery, the negative pressure module and the restraint tray, and the accuracy of the air tightness detection is ensured.

[0037] The air tightness detection device 3 integrates the pressure gauge 31, the first control switch 32 and the second control switch 33 and other key elements in the detection process. Through the control of the first control switch 32 and the second control switch 33 by the positive pressure source, the air flow channel between the negative pressure module and the battery is opened in real time to realize negative pressure test, so as to synchronize the detection with the movement of the logistics line, thereby improving the detection efficiency. The detection system can automatically complete the whole air tightness detection process when the battery reaches the detection system, thereby reducing the manual operation link, improving the detection efficiency and reducing the detection cost.

[0038] In summary, the detection system of the embodiment can rapidly and accurately detect the air tightness of the battery, improve the detection efficiency and reduce the detection cost.

[0039] Reference Figures 1 to 4As shown in the figure (wherein the telescopic end of the telescopic structure 23 is not extended and connected with the telescopic connecting rod 24), the crimping device carrier 2 comprises a rack fixing plate 21, a sub-carrier 22, a telescopic structure 23, a telescopic connecting rod 24 and a guide structure 25, the rack fixing plate 21 is installed on the working rack 4, the installation plate 11 is installed on the sub-carrier 22, the fixed end of the guide structure 25 is installed on the rack fixing plate 21, the telescopic end of the guide structure 25 is fixedly connected with the sub-carrier 22 through the rack fixing plate 21, the telescopic connecting rod 24 is fixed on the sub-carrier 22, the fixed end of the telescopic structure 23 is installed on the rack fixing plate 21, the telescopic end of the telescopic structure 23 is connected with the telescopic connecting rod 24 through the rack fixing plate 21, and the telescopic structure 23 can drive the sub-carrier 22 to move up and down through the telescopic connecting rod 24. In this embodiment, the telescopic structure 23 is configured to: when it is needed to control the sub-carrier 22 to move downward, the telescopic end of the telescopic structure 23 is extended downward and connected with the telescopic connecting rod 24, the telescopic rod is pushed downward to drive the sub-carrier 22 to descend to a suitable height, when it is needed to control the sub-carrier 22 to move upward, the telescopic end of the telescopic structure 23 is retracted upward, the telescopic connecting rod 24 is pulled upward to drive the sub-carrier 22 to move upward, until the telescopic end of the telescopic structure 23 is disconnected with the telescopic connecting rod 24, the sub-carrier 22 no longer rises, and the telescopic end of the telescopic structure 23 is retracted into the fixed end.

[0040] Further, the telescopic structure 23 is a gas cylinder, compared with the single telescopic structure 23, the design of this embodiment reduces the telescopic length of the gas cylinder, even if the telescopic end of the gas cylinder is short, the sub-carrier 22 can also be driven to move up and down, thereby reducing the cost of the telescopic structure 23, on the other hand, in the case of damage to the telescopic structure 23, only the telescopic structure 23 needs to be replaced, without the need to replace the telescopic connecting rod 24, thereby reducing the maintenance cost. Figure 3 As shown in the embodiment, the telescopic end of the telescopic structure 23 is completely retracted into the fixed end, and there is a gap between the telescopic connecting rod 24 and the completely retracted telescopic structure 23, compared with the telescopic structure 23 and the telescopic connecting rod 24 integrated design, since the telescopic connecting rod 24 is fixedly connected with the sub-carrier 22, this design can only replace the gas cylinder when the gas cylinder is damaged, without the need to replace the telescopic connecting rod, thereby reducing the maintenance cost.

[0041] Optionally, in this embodiment, one rack fixing plate 21, two guide structures 25, one telescopic structure 23 and one telescopic connecting rod 24 are arranged on both sides of the sub-carrier 22, and the guide structures 25 are connected through a connecting groove 29.

[0042] As shown in the figures Figure 1 , Figure 5 and Figure 6 , a first adjusting valve 34 for adjusting the positive pressure is arranged between the positive pressure source and the first control switch 32, and a second adjusting valve 35 for adjusting the negative pressure is arranged between the negative pressure source and the second control switch 33.

[0043] Optionally, the air tightness detection device 3 further comprises a third control switch 36 and a first filter 37, the second pressure connector 13 is connected with the pressure gauge 31 and the third control switch 36, and the third control switch 36 is connected with the first filter 37. In this embodiment, the third control switch 36 is an electromagnetic valve, and the third control switch 36 and the first filter 37 cooperate to break the negative pressure state in the air flow channel after the negative pressure test is completed, so as to avoid damage to the negative pressure module.

[0044] Optionally, a second filter 38 for gas-liquid separation is further arranged between the pressure gauge 31 and the second pressure connector 13. In this embodiment, the second filter 38 can prevent water from entering the air flow channel and thus causing damage, and the arrangement of the second filter 38 ensures the safety of the detection.

[0045] Optionally, the pressure gauge 31, the first control switch 32, the second control switch 33, the first regulating valve 34, the second regulating valve 35, the third control switch 36, the first filter 37, and the second filter 38 are arranged in the air control box 39.

[0046] Optionally, the air tightness detection device 3 is provided with a positive pressure source interface 310 and a negative pressure source interface 311 for connecting the positive pressure source and the negative pressure source.

[0047] Referring to Figures 1 to 3 Optionally, the detection system further comprises a clamping member 26 for clamping the negative pressure module, and the clamping member 26 can be installed on the sub-carriage 22 or the mounting plate 11. The clamping member 26 helps to fix the negative pressure module during the process of pressing the sub-carriage 22 to promote the crimping of the crimping device 1, ensures the tightness of the crimping between the first pressure connector 12 and the positive pressure connector and the second pressure connector 13 and the negative pressure connector, and ensures the stability and accuracy of the detection process.

[0048] Optionally, the detection system further comprises a photoelectric sensing frame 27a and a photoelectric sensor 27b for detecting the position of the sub-carriage 22, the photoelectric sensing frame 27a is installed on the rack fixing plate 21, and the photoelectric sensor 27b is installed on the sub-carriage 22. The photoelectric sensing frame 27a and the photoelectric sensor 27b can detect the degree of descent and ascent of the sub-carriage 22 to detect whether the sub-carriage 22 falls to an appropriate height, so that the negative pressure module clamped by the detection system is tightly pressed onto the battery on the restraint tray.

[0049] Optionally, the sub-carriage 22 is further provided with a positioning pin 28. The positioning pin 28 is composed of a positioning member and a retractable spring, and is used for positioning and buffering when the sub-carriage 22 is pressed towards the negative pressure module.

[0050] Next, with a specific embodiment, the detection system of the embodiment is described how to complete the air tightness detection. In the specific embodiment, the device to be detected is a battery connected with a negative pressure module, the battery is stored in a restraint tray, the negative pressure module has a positive pressure interface, a negative pressure interface and a gas control switch for controlling the opening and closing of the air flow channel between the negative pressure module and the battery, and the gas control switch is connected with the positive pressure interface and the negative pressure interface. The logistics line passes through the middle of the working condition rack 4 from the left end to the right end, and the logistics line is opposite to the pressure connector 1 and the pressure connector carrier 2. The negative pressure module, the restraint tray and the battery in the restraint tray enter the detection system from the left side, and are sent out to the right side along the logistics line after detection, so as to circulate until all the batteries are tested.

[0051] Please refer to Figure 8 In the specific embodiment, the negative pressure module A, the restraint tray B and the battery in the restraint tray B flow to the pressure connector 1 and the pressure connector carrier 2 below, the pressure connector carrier 2 controls the downward movement of the pressure connector 1, so that the first pressure connector 12 and the second pressure connector 13 on the pressure connector 1 are tightly connected to the positive pressure interface A1 and the negative pressure interface A2 of the negative pressure module A respectively. At this time, the first adjusting valve 34 is connected with the positive pressure source, the second adjusting valve 35 is connected with the negative pressure source, the positive pressure source gas is adjusted in pressure through the first adjusting valve 34, then connected with the first control switch 32, and then connected with the control end of the second control switch 33 and the first pressure connector 12 through the first control switch 32, so as to control the opening and closing of the second control switch 33 and the air control switch in the negative pressure module A. The negative pressure source can be adjusted in pressure through the second adjusting valve 35, and then connected with the second control switch 33 through the second adjusting valve 35. The second control switch 33 is connected with the second pressure connector 13 through the pressure gauge 31 and the second filter 38. When the second control switch 33 and the air control switch in the negative pressure module A are controlled to be opened, the air flow channel between the negative pressure module A and the battery in the restraint tray B is opened, and the negative pressure source draws negative pressure on the negative pressure interface A2 through the second pressure connector 13 to test the battery under negative pressure.

[0052] In the negative pressure test process, the negative pressure source draws the pressure in the air flow channel to a set value, the negative pressure source is closed, and then the pressure gauge 31 connected with the second pressure connector 13 is used to detect whether the air tightness of the battery is good. Specifically, the judgment method of the air tightness is: observing the pressure value of the pressure gauge 31, if the negative pressure quickly changes from the set value to zero value, the air tightness is not good, and the manual processing is turned to, if it is qualified, the third control switch 36 is opened, so that the negative pressure interface A2 of the negative pressure module A is connected with the first filter 37, the positive pressure is introduced into the air flow channel, so as to break the negative pressure state in the air flow channel, so as to prevent the second pressure connector 13 from being forced to separate under the negative pressure state and damaging the negative pressure module A.

[0053] It should be noted that the embodiment is only used to illustrate the working principle of the test system, and is not used as a specific limitation of the device to be detected.

[0054] Referring to Figure 1 , Figure 2 and Figure 6 , the detection system further comprises an upper cover plate 41 fixedly installed on the working condition rack 4, and the upper cover plate 41 is provided with an electric cabinet 42 and a wire slot 43. The electric cabinet 42 is used for controlling the first control switch 32, the first regulating valve 34, the second regulating valve 35, the third control switch 36 and supplying power for the pressure gauge 31, and the wire slot 43 is used for accommodating the cable.

[0055] Referring to Figures 1 to 3 and Figure 6 , the detection system further comprises a drag chain fixing seat 44 and a drag chain 45 slidably connected to the drag chain fixing seat 44. One end of the drag chain fixing seat 44 is installed on the sub-carriage 22, and the other end of the drag chain fixing seat 44 is installed on the upper cover plate 41. The drag chain 45 passes through the upper cover plate 41 along with the drag chain fixing seat 44. In this embodiment, the function of the drag chain 45 is to provide an auxiliary pulling function for the sub-carriage 22.

[0056] Referring to Figure 1 , Figure 2 and Figure 6 , the side surface of the working condition rack 4 is further provided with a plurality of wire slots 43, the top of the working condition rack 4 is further provided with a plurality of lifting rings 46 for moving the working condition rack 4, the bottom of the working condition rack 4 is provided with a fixed support 47 and a foot cup 48 for stability, and the bottom of the working condition rack 4 is further provided with a forklift fork frame 49 for forklift fork picking.

[0057] Optionally, a plurality of junction boxes 410 are further provided on the upper cover plate 41 and the working condition rack 4.

[0058] Optionally, the working condition rack 4 can further be provided with a scanning assembly 411 for scanning the identification code on the restraint tray. The scanning assembly 411 is used to identify the battery in the restraint tray, which is beneficial for classification and management.

[0059] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims to which they relate.

[0060] Meanwhile, the above disclosed is only preferred embodiment of the utility model, of course cannot with this to limit the utility model right scope, therefore the equivalent change of the utility model application patent scope still belongs to the range that the utility model covers.

Claims

1. A detection system for detecting air tightness, characterized in that, The application relates to a crimping device, a crimping device carrier, an air tightness detection device and a working condition rack. The crimping device comprises a mounting plate, a first crimping piece and a second crimping piece, the first crimping piece and the second crimping piece are respectively used for being crimped to a positive pressure interface and a negative pressure interface of a negative pressure module, the negative pressure module is connected with a to-be-detected device, the first crimping piece and the second crimping piece are arranged on the mounting plate, the mounting plate is mounted on the crimping device carrier, the crimping device carrier is mounted on the working condition rack, and the crimping device carrier can drive the crimping device to move up and down. The air tightness detection device is mounted on the working condition rack, and the air tightness detection device comprises a pressure gauge, a first control switch and a second control switch, the second control switch is an air control switch, the first control switch is connected in a gas path between the first crimping piece, a control end of the second control switch and a positive pressure source, the second control switch is connected in a gas path between the second crimping piece and a negative pressure source, and the pressure gauge is located in the gas path where the second crimping piece is located. The first crimping piece is used for applying positive pressure provided by the positive pressure source to the positive pressure interface, so as to open an air flow channel between the negative pressure module and the to-be-detected device. The second crimping piece is used for extracting negative pressure from the negative pressure interface, and the pressure gauge is used for detecting the negative pressure value in the gas path where the second crimping piece is located.

2. The detection system for detecting air tightness according to claim 1, characterized in that, The crimping device carrier comprises a rack fixing plate, a sub-carrier, an extension structure, an extension connecting rod and a guide structure, the rack fixing plate is mounted on the working condition rack, the mounting plate is mounted on the sub-carrier, a fixed end of the guide structure is mounted on the rack fixing plate, a telescopic end of the guide structure is fixedly connected with the sub-carrier through the rack fixing plate, the extension connecting rod is fixed on the sub-carrier, a fixed end of the extension structure is mounted on the rack fixing plate, and a telescopic end of the extension structure is connected with the extension connecting rod through the rack fixing plate, and the extension structure can drive the sub-carrier to move up and down through the extension connecting rod.

3. The detection system for detecting air tightness according to claim 1, characterized in that, A first adjusting valve for adjusting positive pressure is arranged in the gas path between the positive pressure source and the first control switch, and a second adjusting valve for adjusting negative pressure is arranged in the gas path between the negative pressure source and the second control switch.

4. The detection system for detecting air tightness according to claim 1, characterized in that, The air tightness detection device further comprises a third control switch and a first filter, the second crimping piece is further connected through the pressure gauge and the third control switch, and the third control switch is connected with the first filter.

5. The detection system for detecting air tightness according to claim 1, characterized in that, A second filter for gas-liquid separation is further arranged in the gas path between the pressure gauge and the second crimping piece.

6. The detection system for detecting air tightness according to claim 2, characterized in that, A clamping piece for clamping the negative pressure module is further arranged, and the clamping piece can be mounted on the sub-carrier or the mounting plate.

7. The detection system for detecting air tightness according to claim 2, characterized in that, A photoelectric sensing frame and a photoelectric sensor for detecting the lifting position of the sub-carrier are further arranged, the photoelectric sensing frame is mounted on the rack fixing plate, and the photoelectric sensor is mounted on the sub-carrier.

8. The detection system for detecting air tightness according to claim 2, characterized in that, A positioning pin is further arranged on the sub-carrier.

9. The detection system for detecting air tightness according to claim 2, characterized in that, An upper cover plate fixedly mounted on the working condition rack is further arranged, and an electric cabinet and a wire slot are arranged on the upper cover plate.

10. The detection system for detecting air tightness according to claim 9, characterized in that, The device further comprises a tow chain fixing seat and a tow chain slidingly connected to the tow chain fixing seat, one end of the tow chain fixing seat is installed on the sub-carrier, the other end of the tow chain fixing seat is installed on the upper cover plate, and the tow chain passes through the upper cover plate along with the tow chain fixing seat.

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