Airtightness detection device for combined assembly of hard metal tube and rubber hose and use method of airtightness detection device

Abstract

The invention belongs to the technical field of automobile manufacturing air tightness detection, and particularly relates to an air tightness detection device for a metal hard pipe and rubber hose combined assembly and a use method thereof.The device comprises a main body, a working table is arranged in the middle of the main body, a controller is installed at the upper end of the main body, and the working table supports an inclined detection table through a lifting frame; and each group comprises a horizontal first cylinder and a vertical second cylinder which are respectively connected with the positioning jig and the sealing jig. According to the air path system, through an independent digital display precise pressure regulating valve and a pressure sensor, precise control over the rigid pressure of 0.5 MPa-0. 6 MPa and the flexible pressure of 0.1 MPa-0. 3 MPa is achieved through a controller. When the device is used, through clamping positioning, two-way pressure setting, pressure maintaining detection and result judgment, loading hoop locking force simulation, detection fitting degree improvement and multi-station parallel detection supporting, the controller records pressure data in real time, the result is fed back through the prompt lamp, and the detection efficiency and accuracy are remarkably improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automotive manufacturing air tightness detection, and particularly relates to a metal hard pipe and rubber hose combined assembly air tightness detection device and a use method thereof. BACKGROUND

[0002] In the automotive engine pipeline system and battery pack cooling system, the combined assembly formed by connecting the metal hard pipe and the rubber hose through different specifications of the clamp is widely used, and the air tightness performance of the combined assembly directly affects the reliability and safety of the system. In the existing detection process, the hose end is usually sealed by using a pneumatic cylinder to press, and the detection pressure needs to reach 0.5 MPa-0.6 MPa to simulate the actual working condition. However, for the air tightness detection of the metal hard pipe and rubber hose connection assembly, the traditional detection device usually uses a single cylinder to uniformly apply pressure, and the mechanical differences between the two types of pipes and the stress characteristics under the actual loading scene are not fully considered. The pressure of the pneumatic cylinder borne by the rubber hose end is consistent with that borne by the metal hard pipe end. Under this pressure, the rubber hose is severely deformed, and the potential defects such as cracks and depressions in the inner wall of the rubber hose are covered due to extrusion, and cannot be effectively identified by the air tightness detection.

[0003] Because the detection device does not differentially control the pressure of the hose end, the detection conditions are inconsistent with the actual working conditions, the defect omission rate is high, and then safety hazards such as cooling liquid leakage and gas leakage may be caused, which affects the performance of the whole vehicle. Therefore, it is urgent to provide an air tightness detection device and method which can accurately simulate the stress state of the hose end under the loading condition, meet the assembly detection pressure requirement, avoid the interference of the excessive deformation of the hose on the defect identification, and improve the detection accuracy and reliability. SUMMARY

[0004] In view of the above problems in the prior art, the application provides a metal hard pipe and rubber hose combined assembly air tightness detection device and a use method thereof, to solve the problems in the background art.

[0005] In order to solve the above technical problems, the application adopts the following technical solutions: A metal hard pipe and rubber hose combined assembly air tightness detection device, comprising a main body, a workbench is arranged in the middle of the main body, and a controller is arranged at the upper end of the main body; the workbench is fixedly connected with a detection table through a lifting frame; and the detection table is used for placing a pipe body to be detected; The pipe body comprises a rubber hose end and a metal hard pipe end. The detection platform is provided with a detection part through a mounting hole, the detection part comprises a horizontally placed first cylinder, the output end of the first cylinder is connected with a positioning jig for positioning and sealing the metal hard pipe end, a first adjusting valve and a first pressure sensor are sequentially arranged in the gas circuit of the first cylinder, the detection platform further comprises a vertically placed second cylinder, the output end of the second cylinder is connected with a sealing jig for sealing the rubber hose end, a second adjusting valve and a second pressure sensor are sequentially arranged in the gas circuit of the second cylinder, and the first cylinder and the second cylinder are connected with a gas source through independent gas circuits.

[0006] Further, the controller is provided with an operation part and a display module, the main body is further provided with a prompt lamp connected with the controller, and the prompt lamp can display different color light signals to feedback detection states.

[0007] Preferably, the first adjusting valve and the second adjusting valve are two digital precise pressure regulating valves.

[0008] Further, a plurality of detection parts are sequentially arranged on the detection platform, and the detection parts are electrically connected with the controller.

[0009] Further, the positioning jig comprises a positioning groove matched with the outer shape of the metal hard pipe end and a sealing head, the sealing head is internally provided with a gas passage communicated with the gas source, so that the positioning and sealing effect on the metal hard pipe end is ensured, the sealing jig comprises a driving end connected with the output end of the second cylinder, a sealing cavity matched with the outer shape of the rubber hose end and a fixed end for providing mounting support for the sealing jig, and a communication pipe is arranged in the sealing cavity.

[0010] Preferably, the surface of the sealing cavity is provided with a rubber pad.

[0011] Further, the main body is further provided with a storage cabinet located below the workbench, universal wheels at the bottom of the main body and an auxiliary support part.

[0012] The use method of the metal hard pipe and rubber hose combined assembly air tightness detection device comprises the following steps: S1, clamping and positioning: placing a pipe body to be detected on the detection platform, aligning the metal hard pipe end with the positioning jig and the rubber hose end with the sealing jig, controlling the first cylinder through the controller to drive the positioning jig to position and seal the metal hard pipe end, and simultaneously starting the second cylinder to drive the sealing jig to move downward to pre-seal the rubber hose end; S2, pressure setting: inputting detection parameters through the operation part of the controller, controlling the first adjusting valve to adjust the output pressure of the first cylinder to 0.5-0.6 MPa, and independently controlling the second adjusting valve to adjust the output pressure of the second cylinder to 0.2 MPa, so that the flexible sealing cavity of the sealing jig is in contact with the rubber hose end to form a contact pressure, and the actual locking force of the clamp during loading is simulated; S3, air tightness detection: the controller controls the air source to pass through the air hole of the positioning jig to pass into the compressed air in the pipe body until the pressure in the pipe body reaches the set detection pressure; the first pressure sensor and the second pressure sensor monitor the air pressure in real time and transmit the data to the controller, which is dynamically displayed by the display module; keep the pressure stable and keep the pressure for a preset time of 30s-60s; S4, result judgment: after the pressure holding is finished, the controller calculates the pressure decay or leakage rate in the pipe body; if the pressure decay is less than or equal to the preset threshold, it is determined that the air tightness is qualified, and the controller drives the prompt light to display green light; if the pressure decay is greater than the preset threshold, it is determined that there is a sealing defect, the prompt light displays red light, and the pressure abnormal data is recorded through the display module.

[0013] Further, in S2, the output pressure of the second cylinder can be adaptively adjusted within 0.1MPa-0.3MPa by the controller operating the second adjusting valve according to the material hardness and pipe diameter specification of the rubber hose, to ensure adaptation to the actual working condition.

[0014] Compared with the prior art, the present application has the following beneficial effects: 1. The first cylinder horizontally arranged and the second cylinder vertically arranged realize double-path independent pressure regulation, the first cylinder adopts 0.5MPa-0.6MPa rigid sealing for the metal hard pipe end, and the second cylinder adopts 0.1MPa-0.3MPa flexible sealing for the rubber hose end, which respectively matches the characteristics of the two materials, avoids detection errors caused by hard pipe sealing not tight or hose excessive deformation, and effectively improves the accuracy of air tightness detection.

[0015] 2. The detection table is fixed with the detection part through a plurality of mounting holes, and can adapt to different pipe diameters, wall thicknesses, metal hard pipes and rubber hose combination assemblies by replacing the positioning groove of the positioning jig and the sealing cavity of the sealing jig; the detection table is inclined and matched with a clear pressure display module, so that the operator can observe the clamping state and pressure data, and reduce the operation difficulty.

[0016] 3. The pressure regulation range of the second cylinder is 0.1MPa-0.3MPa, which accurately simulates the actual locking force and material characteristics of the clamp during loading, and the sealing cavity adopts the cooperation of the aging-resistant rubber pad and the communication pipe, which not only ensures the sealing reliability, but also restores the stress state of the hose in actual use, so that the detection result is more close to the real working condition requirement.

[0017] 4. The detection table can be arranged with multiple detection parts, and the controller supports parallel detection control, which significantly improves the batch detection efficiency; at the same time, the controller records the pressure curve in real time through the pressure sensor, combines the color feedback of the prompt light and the data storage function of the display module, and can quickly trace the detection process of qualified / unqualified parts, which is convenient for quality control.

[0018] 5. The casters and auxiliary support at the bottom of the main body enable the device to move flexibly and be placed stably. The storage cabinet under the workbench facilitates the storage of wiring and spare parts. The overall structural design takes into account both testing performance and practicality in production scenarios. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of an airtightness testing device for a combination of a metal rigid tube and a rubber flexible tube according to the present invention. Figure 2 This is a schematic diagram of the cylinder connection structure of an airtightness testing device for a combination of a metal rigid tube and a rubber flexible tube according to the present invention. Figure 3 This is a three-dimensional structural diagram of the workbench of the airtightness testing device for a combination of a metal rigid tube and a rubber flexible tube according to the present invention. Figure 4 This is a schematic diagram of the connection structure of the lifting frame of the airtightness testing device for a combination of a metal rigid tube and a rubber flexible tube according to the present invention. Figure 5 This is a three-dimensional structural diagram of the detection section of the airtightness testing device for a combination of a metal rigid tube and a rubber flexible tube according to the present invention. Figure 6 This is a three-dimensional structural diagram of the rubber hose end of the airtightness testing device for a metal rigid tube and rubber hose assembly according to the present invention. Figure 7 for Figure 1 A magnified view of a section at point A in the middle; Figure 8 This is a step diagram illustrating the method of using the airtightness testing device for a combination of a metal rigid tube and a rubber flexible tube according to the present invention; The reference numerals in the accompanying drawings include: 1. Main body; 11. Workbench; 111. Lifting frame; 12. Testing table; 121. Mounting hole; 13. Casters; 14. Auxiliary support; 15. Storage cabinet; 2. Controller; 21. Operating unit; 3. Indicator light; 4. Pipe body; 41. Rubber hose end; 42. Metal rigid pipe end; 5. Testing unit; 51. First cylinder; 511. Positioning fixture; 512. First regulating valve; 513. First pressure sensor; 514. Positioning groove; 515. Sealing head; 516. Vent hole; 52. Second cylinder; 521. Sealing fixture; 522. Fixed end; 523. Second regulating valve; 524. Second pressure sensor; 525. Drive end; 526. Sealing chamber; 527. Connecting pipe; 53. Air source. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Example 1: like Figures 1-8 As shown, this invention provides an airtightness testing device for a combination of a metal rigid pipe and a rubber flexible hose, comprising a main body 1, a horizontally arranged worktable 11 in the middle of the main body 1, and a controller 2 fixedly mounted on the upper end. Figure 1 , Figures 3-4 As shown, the workbench 11 supports the testing table 12 upwards via an L-shaped lifting frame 111, causing the testing table 12 to tilt onto the surface of the workbench 11, facilitating observation and clamping of the tube 4 by the operator. The testing table 12 is a rectangular flat plate with multiple sets of mounting holes 121 on its upper surface, which are used to fix the testing part 5 and to store the wiring.

[0025] The pipe body 4 is an assembly of a rigid metal pipe and a flexible rubber hose connected by clamps, including a flexible rubber hose end 41 and a rigid metal pipe end 42. Multiple detection units 5 are arranged equidistantly along the length of the detection table 12, allowing for simultaneous multi-unit testing to improve efficiency. Each detection unit 5 includes a horizontally placed first cylinder 51 and a vertically placed second cylinder 52. The first cylinder 51 is horizontally fixed to the detection table 12, with its output end connected to a positioning fixture 511; the second cylinder 52 is vertically fixed above the detection table 12, with its output end facing downwards and connected to a sealing fixture 521.

[0026] Secondly, the positioning fixture 511 includes a positioning groove 514 and a sealing head 515 that are adapted to the shape of the metal rigid tube end 42, and the two are integrally formed. The inner wall of the positioning groove 514 is smooth and fits tightly against the outer wall of the metal rigid tube end 42 to achieve mechanical positioning; the end face of the sealing head 515 has a vent hole 516 and an internal sealing ring (not shown in the figure). When the first cylinder 51 pushes the positioning fixture 511 to move, the sealing head 515 is pressed against the end face of the metal rigid tube end 42, and the detection gas is introduced into the tube body 4 through the vent hole 516.

[0027] Meanwhile, the sealing fixture 521 includes a drive end 525, a sealing cavity 526, and a fixed end 522. The drive end 525 is rigidly connected to the output shaft of the second cylinder 52 and moves up and down with the cylinder. The sealing cavity 526 is a hollow cylinder, composed of annular grooves on the facing surfaces of the drive end 525 and the fixed end 522. The surface of the sealing cavity 526 is covered with an aging-resistant rubber pad to ensure a flexible seal while avoiding excessive compression of the hose. Furthermore, a connecting pipe 527 is connected inside the sealing cavity 526. The cross-section of the connecting pipe 527 matches the inner diameter of the rubber hose end 41, which is used to seal and allow air to pass through the rubber hose end 41. The fixed end 522 is fixed to the upper surface of the testing table 12 by bolts, providing stable support for the sealing fixture 521.

[0028] In this embodiment, as Figure 2 As shown, the air path of the first cylinder 51 is sequentially connected to the first regulating valve 512 and the first pressure sensor 513, and the air path of the second cylinder 52 is sequentially connected to the second regulating valve 523 and the second pressure sensor 524. The two air paths are independently connected in parallel to the air source 53. The controller 2 has a built-in PLC control module and is equipped with an operation unit 21 and a display module. The controller 2 is electrically connected to the first regulating valve 512, the second regulating valve 523, the first pressure sensor 513, and the second pressure sensor 524. It receives the detection parameters input by the user through the operation unit 21 and displays the pressure and detection results in real time on the display module.

[0029] Furthermore, four casters 13 and two sets of auxiliary support parts 14 are installed at the bottom of the main body 1, and a drawer-type storage cabinet 15 is set under the workbench 11 for storing cables and other items.

[0030] Meanwhile, the main body 1 is also equipped with an indicator light 3, which is electrically connected to the controller 2 and is used to visually display the test results. The test results are indicated by different colored lights of the indicator light 3.

[0031] The method of using this device includes the following steps: First, clamping and positioning are performed. The operator places the tube body 4 to be tested on the inclined testing table 12, aligning the metal rigid tube end 42 with the positioning groove 514 of the positioning fixture 511, and the rubber hose end 41 with the sealing cavity 526 of the sealing fixture 521. A command is issued through the operating unit 21 of the controller 2 to start the first cylinder 51. The cylinder output shaft pushes the positioning fixture 511 to move horizontally, and the positioning groove 514 fits tightly against the outer wall of the metal rigid tube end 42, achieving mechanical positioning. Simultaneously, the end face of the sealing head 515 is pressed against the end face of the metal rigid tube end 42 under the thrust of the cylinder, forming a preliminary seal through the built-in sealing ring. The second cylinder 52 is then started simultaneously, and its output shaft drives the drive end 525 to move vertically downward, closing the upper and lower annular grooves of the sealing cavity 526. The rubber pad makes tight contact with the outer wall of the rubber hose end 41, and the connecting pipe 527 is inserted into the interior of the rubber hose end 41, completing the pre-sealing.

[0032] Next, pressure parameters are set. The detection parameters are input through the operation unit 21 of controller 2, controlling the first regulating valve 512 to adjust the output pressure of the first cylinder 51 to 0.5MPa-0.6MPa, ensuring a reliable seal between the sealing head 515 and the end face of the metal rigid pipe 42. Based on the material hardness and pipe diameter of the rubber hose, the output pressure of the second cylinder 52 is adjusted to 0.2MPa through the second regulating valve 523. This can be adaptively adjusted within the range of 0.1MPa-0.3MPa, allowing the rubber gasket of the sealing cavity 526 to wrap around the rubber hose end 41 with a fitting pressure, simulating the actual locking force of the clamp during vehicle installation. At this time, the first pressure sensor 513 and the second pressure sensor 524 monitor the pressure values ​​of the two air paths in real time and transmit the data to controller 2, dynamically displaying it on the display module to ensure that the pressure parameters meet the set requirements.

[0033] The airtightness test then begins. Controller 2 activates air source 53, and compressed air is injected into the tube 4 through the vent 516 of positioning fixture 511. Simultaneously, airflow circulates through the connecting pipe 527 of sealing fixture 521 until the pressure inside the tube 4 reaches the set test pressure (consistent with the output pressure of the first cylinder 51). The pressure is then stabilized, and a pressure holding phase begins, with a holding time set to 30-60 seconds. During this period, controller 2 continuously collects monitoring data from the first pressure sensor 513 and the second pressure sensor 524, assessing pressure fluctuations in real time. If an abnormal pressure occurs, a notification is displayed on the screen.

[0034] Finally, the results are judged and processed. After the pressure holding period, controller 2 automatically calculates the pressure drop or leakage rate inside pipe body 4. If the pressure drop is ≤ a preset threshold (e.g., 0.01 MPa), it is judged to be airtight, controller 2 drives indicator light 3 to display a green light, and the display module records the qualified data; if the pressure drop is > a preset threshold, it is judged to have a sealing defect, indicator light 3 displays a red light, and the display module marks the time point and value of the pressure abnormality, which is convenient for operators to trace the problem. After the test is completed, controller 2 controls the first cylinder 51 and the second cylinder 52 to release pressure and reset in sequence. The operator takes out pipe body 4. Qualified parts flow into the next process, and unqualified parts are marked and further analyzed.

[0035] By utilizing the above-described method, the ease of operation of the tilting test stand, the precise control of the independent pressure adjustment of the dual cylinders, and the combination of flexible and rigid seals, the airtightness test of the metal rigid pipe and rubber hose assembly can be completed efficiently and accurately, meeting actual production needs.

[0036] The above are merely embodiments of the present invention. The circuits, electronic components, and modules involved are all prior art, fully achievable by those skilled in the art, and require no further explanation. The scope of protection in this application does not involve improvements to the software and methods. Commonly known structures and characteristics in the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all prior art in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A device for testing the airtightness of a combination assembly of a metal rigid pipe and a rubber flexible hose, characterized in that: Includes a main body (1), a workbench (11) is provided in the middle of the main body (1), and a controller (2) is installed at the upper end; the workbench (11) is fixedly connected to a testing table (12) through a lifting frame (111); the testing table (12) is used to place the tube (4) to be tested. The tube body (4) includes a rubber hose end (41) and a metal rigid tube end (42). The testing station (12) is equipped with a testing unit (5) through a mounting hole (121). The testing unit (5) includes: a first cylinder (51) placed horizontally, whose output end is connected to a positioning fixture (511) for positioning and sealing the end of the metal hard tube (42). The air path of the first cylinder (51) is provided with a first regulating valve (512) and a first pressure sensor (513) in sequence. It also includes a second cylinder (52) placed vertically, whose output end is connected to a sealing fixture (521) for sealing the end of the rubber hose (41). The air path of the second cylinder (52) is provided with a second regulating valve (523) and a second pressure sensor (524) in sequence. The first cylinder (51) and the second cylinder (52) are connected to an air source (53) through independent air paths.

2. The airtightness testing device for the metal rigid pipe and rubber flexible hose assembly as described in claim 1, characterized in that: The controller (2) is provided with an operation unit (21) and a display module; the main body (1) is also provided with an indicator light (3) connected to the controller (2); the indicator light (3) can display different colored light signals to feedback the detection status.

3. The airtightness testing device for the metal rigid pipe and rubber flexible hose assembly as described in claim 1, characterized in that: The first regulating valve (512) and the second regulating valve (523) are two digital display precision pressure regulating valves.

4. The airtightness testing device for the metal rigid tube and rubber flexible tube assembly as described in claim 1, characterized in that: Multiple detection units (5) are sequentially arranged on the detection station (12), and each detection unit (5) is electrically connected to the controller (2).

5. The airtightness testing device for the metal rigid tube and rubber flexible tube assembly as described in claim 1, characterized in that: The positioning fixture (511) includes a positioning groove (514) adapted to the shape of the metal hard tube end (42) and a sealing head (515). The sealing head is provided with a vent hole (516) connected to the air source to ensure the positioning and sealing effect of the metal hard tube end (42). The sealing fixture (521) includes a drive end (525) connected to the output end of the second cylinder (52), a sealing cavity (526) adapted to the shape of the rubber hose end (41), and a fixing end (522) that provides installation support for the sealing fixture. A connecting pipe (527) is installed in the sealing cavity (526).

6. The airtightness testing device for the metal rigid tube and rubber flexible tube assembly as described in claim 5, characterized in that: A rubber pad is provided on the surface of the sealing cavity (526).

7. The airtightness testing device for the metal rigid tube and rubber flexible tube assembly as described in claims 1-6, characterized in that: The main body (1) is also provided with a storage cabinet (15) located below the workbench (11), as well as casters (13) and auxiliary support parts (14) at the bottom of the main body (1).

8. A method of using a metal rigid pipe and rubber flexible hose assembly airtightness testing device, applied to the device described in any one of claims 1-7, characterized in that, Includes the following steps: S1, clamping and positioning: Place the tube body (4) to be tested on the testing table (12), align the metal hard tube end (42) with the positioning fixture (511), and align the rubber hose end (41) with the sealing fixture (521); control the first cylinder (51) through the controller (2) to drive the positioning fixture (511) to position and seal the metal hard tube end (42); simultaneously start the second cylinder (52) to drive the sealing fixture (521) to move down to pre-seal the rubber hose end (41); S2, Pressure setting: Input the detection parameters through the operation section (21) of the controller (2), control the first regulating valve (512) to adjust the output pressure of the first cylinder (51) to 0.5MPa-0.6MPa; control the second regulating valve (523) to independently adjust the output pressure of the second cylinder (52) to 0.2MPa, so that the flexible sealing cavity of the sealing fixture (521) and the end of the rubber hose (41) form a fitting pressure, simulating the actual locking force of the clamp during vehicle loading; S3, air tightness test: The controller (2) controls the air source (53) to introduce compressed air into the pipe body (4) through the air vent (516) of the positioning fixture (511) until the pressure in the pipe body (4) reaches the set detection pressure; the air pressure is monitored in real time by the first pressure sensor (513) and the second pressure sensor (524), and the data is transmitted to the controller (2) and dynamically displayed by the display module; the pressure is kept stable and the pressure is held for a preset time of 30s-60s; S4, Result judgment: After the pressure holding is completed, the controller (2) calculates the pressure decay or leakage rate in the pipe body (4); if the pressure decay is less than or equal to the preset threshold, it is judged to be airtight and the controller (2) drives the indicator light (3) to display a green light; if the pressure decay is greater than the preset threshold, it is judged to be a sealing defect and the indicator light (3) displays a red light, and the abnormal pressure data is recorded through the display module.

9. The method of using the airtightness testing device for the metal rigid pipe and rubber flexible hose assembly as described in claim 8, characterized in that: In S2, the output pressure of the second cylinder (52) can be adaptively adjusted within 0.1MPa-0.3MPa by the controller (2) through the operation of the second regulating valve (523) according to the material hardness and pipe diameter of the rubber hose, so as to ensure that it is compatible with the actual working conditions.

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