A system and method for testing the air tightness of a hydraulic clutch

Abstract

This application discloses a system and method for testing the airtightness of a hydraulic clutch. The system includes a controller, an impact pipeline connected to each working chamber of the hydraulic clutch, and a testing pipeline. The other end of the impact pipeline is connected to an air source, and the impact pipeline is equipped with a one-way valve and a pneumatic impact valve. The testing pipeline includes a main testing pipe shared by the two working chambers and a testing branch pipe located between the main testing pipe and the corresponding working chamber. The other end of the main testing pipe is connected to an air source, and the main testing pipe is equipped with an airflow regulating and testing device, a first pressure gauge, and a first pressure transmitter. A solenoid valve is installed on the testing branch pipe. The controller is signal-connected to the first pressure transmitter, the pneumatic impact valve, the actuator of the airflow regulating and testing device, and the two-way solenoid valve. This application uses compressed air instead of oil for the factory testing of the hydraulic clutch, reducing testing costs, pollution and consumption, and simplifying maintenance.

Description

Technical Field

[0001] This application relates to the field of engineering machinery, and more specifically, to a system and method for testing the air tightness of a hydraulic clutch. Background Technology

[0002] As a key component of the forklift's hydraulic transmission, the hydraulic clutch directly affects the performance of the entire vehicle's transmission system and is a crucial part for ensuring the reliable operation of the vehicle.

[0003] Currently, the factory testing of forklift hydraulic clutches is carried out using a hydraulic pump station. Under static conditions, pressurized oil of a constant pressure and flow rate is introduced into the working chamber of the hydraulic clutch, and the pressure that can be built up in the forward and reverse gears under a constant flow rate and pressure is tested to determine whether the clutch's sealing performance meets the requirements.

[0004] The hydraulic pump testing method has the following problems:

[0005] 1) High testing costs: Hydraulic oil is contaminated, and the test oil needs to be replaced, replenished and purified regularly, which increases the cost of oil procurement and oil purifier consumables, and wastes energy.

[0006] 2) It can easily cause contamination: Because the residual oil inside the clutch after the test cannot be completely drained, it can easily lead to oil contamination in the gearbox assembly line.

[0007] 3) The hydraulic test bench occupies a large area, which affects the overall process layout of the workshop and is difficult to maintain. Summary of the Invention

[0008] This application provides a system and method for testing the air tightness of a hydraulic clutch. Compressed air is used instead of oil for factory testing of the hydraulic clutch, which reduces testing costs, pollution and consumption, and makes maintenance easier.

[0009] This application provides an airtightness testing system for a hydraulic clutch, including a controller, an impact line communicating with each working chamber of the hydraulic clutch, and a testing line;

[0010] The other end of the impact pipeline is connected to the air source, and the impact pipeline is equipped with a check valve and a pneumatic impact valve.

[0011] The detection pipeline includes a main detection pipe shared by two working chambers and a detection branch pipe set between the main detection pipe and the corresponding working chamber; the other end of the main detection pipe is connected to the air source, and the main detection pipe is equipped with an airflow regulating and detection device, a first pressure gauge and a first pressure transmitter, and the detection branch pipe is equipped with a solenoid valve;

[0012] The controller is connected to the actuators and solenoid valves of the first pressure transmitter, pneumatic impact valve, airflow regulation and detection device.

[0013] Preferably, the airtightness testing system further includes a sliding frame mounted above the clutch production line, a first connecting seat suspended below the sliding frame, and a testing box separately from the first connecting seat;

[0014] The first connecting seat is provided with a slot for connecting to the end of the hydraulic clutch. The slot has a first air inlet for the first working chamber and a second air inlet for the second working chamber on its two opposite side walls. The first air inlet and the second air inlet are respectively connected to the first oil inlet on the hydraulic clutch that communicates with the first working chamber and the second oil inlet that communicates with the second working chamber, as well as the impact pipe and detection pipe of the corresponding working chamber outside the sealed container.

[0015] Preferably, the airtightness testing system further includes a sealed container, a second connecting seat on the sealed container, a first connecting head for the first working chamber and a second connecting head for the second working chamber on the second connecting seat, the first connecting head and the second connecting head being respectively connected to the impact pipeline and the testing pipeline of the corresponding working chamber;

[0016] In operation, the hydraulic clutch under test is enclosed in a sealed container. The first connector is connected to the first working chamber of the hydraulic clutch under test, and the second connector is connected to the second working chamber of the hydraulic clutch under test.

[0017] Preferably, the sealed container is equipped with a second pressure gauge and a second pressure transmitter, and the second pressure transmitter is connected to the controller signal.

[0018] Preferably, a weighing sensor is provided at the bottom of the sealed container, and the weighing sensor is connected to the controller signal.

[0019] Preferably, the airflow regulation and detection device includes one or more of a filter, a throttle, a pressure regulating valve, an air source triplet, and a flow meter.

[0020] Preferably, the controller is a PLC controller.

[0021] This application also provides a method for testing the airtightness of a hydraulic clutch, including:

[0022] One of the pneumatic impact valves is energized at high frequency, the impact pipeline is opened, and compressed air enters the corresponding working chamber of the hydraulic clutch being tested through the pneumatic impact valve and the check valve.

[0023] The pneumatic impact valve is de-energized and energized according to a preset time interval and a preset number of vibrations. After the preset number of vibrations is reached, the pneumatic impact valve is de-energized.

[0024] When the solenoid valve corresponding to the control working chamber is energized, the detection pipeline is opened, allowing compressed air to enter the corresponding working chamber of the hydraulic clutch being tested through the airflow regulating and detection device and the solenoid valve.

[0025] Once the pressure inside the working chamber reaches the preset value, the solenoid valve is de-energized, and the working chamber enters the pressure-holding state.

[0026] After setting the pressure holding time, calculate the leakage of the working chamber and obtain the airtightness test result of the working chamber based on the leakage.

[0027] Preferably, calculating the leakage amount includes:

[0028] The leakage amount is calculated based on the change in the first pressure gauge value at the end of the pressure holding period.

[0029] Preferably, calculating the leakage amount includes:

[0030] The leakage amount is calculated based on the change in the second pressure gauge at the end of the pressure holding period.

[0031] Preferably, after one working chamber completes the airtightness test, the airtightness test of the other working chamber is automatically controlled.

[0032] Preferably, calculating the leakage amount includes:

[0033] The leakage is calculated based on the change in the weighing sensor value at the end of the pressure holding period.

[0034] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0036] Figure 1 A schematic diagram of the air tightness testing system for the hydraulic clutch provided in this application;

[0037] Figure 2 A schematic diagram of the airtightness testing system used in the production site provided in this application;

[0038] Figure 3 for Figure 2 Structural diagram of the first connecting seat;

[0039] Figure 4 A schematic diagram of the structural principle of an embodiment of the airtightness testing system for laboratory use provided in this application;

[0040] Figure 5A schematic diagram of the structural principle of one embodiment of the airtightness testing system for laboratory use provided in this application. Detailed Implementation

[0041] Various exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application.

[0042] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0043] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0044] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0045] This application provides a system and method for testing the air tightness of a hydraulic clutch. Compressed air is used instead of oil for factory testing of the hydraulic clutch, which reduces testing costs, pollution and consumption, and makes maintenance easier.

[0046] like Figure 1 As shown, the hydraulic clutch 50 under test has a first working chamber 501 corresponding to the forward gear piston of the forklift and a second working chamber 502 corresponding to the reverse gear piston of the forklift. The ends of the forward gear piston and the reverse gear piston are both equipped with sealing rings, which play a key role in the sealing of the working chambers.

[0047] like Figure 1 As shown, the air tightness testing system for the hydraulic clutch provided in this application includes a controller (not shown in the figure) and a testing pipeline connected to each working chamber of the hydraulic clutch 50.

[0048] The detection pipeline includes a main detection pipe shared by the two working chambers and detection branch pipes located between the main detection pipe and the corresponding working chamber. The other end of the main detection pipe is connected to an air source, and the main detection pipe is equipped with an airflow regulating and detection device, a first pressure gauge, and a first pressure transmitter. A solenoid valve is installed on the detection branch pipe.

[0049] The controller is connected to the actuators and sensors on the detection pipeline. In other words, the controller is connected to the actuators and solenoid valves in the first pressure transmitter, the airflow regulating and detection device. The first pressure transmitter is used to convert the gas pressure in the detection pipeline into a pneumatic or electric signal and transmit it to the controller. The controller controls the actuators and solenoid valves in the airflow regulating and detection device to perform actions based on the pressure signal.

[0050] The airflow regulation and detection device includes one or more of the following: filter, throttle, pressure regulating valve, air source triplet, and flow meter. Figure 1 In the embodiment shown, the airflow regulation and detection device on the detection manifold includes a filter 15, a precision pressure regulating valve 16, and a flow meter 18. A first pressure gauge 17 is disposed between the precision pressure regulating valve 16 and the flow meter 18, and a first pressure transmitter 19 is disposed downstream of the flow meter 18.

[0051] exist Figure 1 In the embodiment shown, a first two-way solenoid valve 14 is provided on the detection branch corresponding to the first working chamber 501, and a second two-way solenoid valve 13 is provided on the detection branch corresponding to the second working chamber 502.

[0052] Preferably, the airtightness testing system further includes an impact pipeline, the other end of which is connected to the air source 60. The actuator on the impact pipeline is signal-connected to the controller. As one embodiment, the impact pipeline is equipped with a one-way valve and a pneumatic impact valve. The controller is signal-connected to the pneumatic impact valve, and the controller controls the pneumatic impact valve to operate based on the pressure signal in the impact pipeline.

[0053] Figure 1 In the illustrated embodiment, for the first working chamber 501, the corresponding impact pipeline includes a first pneumatic impact valve 12 and a check valve between the air source 60 and the air inlet of the first working chamber 501. For the second working chamber 502, the corresponding impact pipeline includes a second pneumatic impact valve 11 and a check valve between the air source 60 and the air inlet of the second working chamber 502.

[0054] Based on the above preferred embodiments, the airtightness detection method of the hydraulic clutch executed by the controller includes:

[0055] P1: Control one of the pneumatic impact valves (e.g., 12) to be energized at high frequency, and the impact pipeline is opened, so that compressed air enters the corresponding working chamber (e.g., the first working chamber 501) of the hydraulic clutch being tested through the pneumatic impact valve and the check valve, thereby pushing the piston (e.g., the forward gear piston) to move to another working chamber.

[0056] P2: Control the pneumatic impact valve to de-energize and energize according to the preset time interval and preset number of vibrations, and de-energize the pneumatic impact valve after the preset number of vibrations is reached.

[0057] Specifically, after the pneumatic impact valve is energized for a first preset time (e.g., 100-1000ms) and then de-energized for a second preset time, the gas pressure in the working chamber decreases due to leakage. The piston returns to its original position under the action of the return spring, thus completing one reciprocating motion. By cyclically energizing and de-energizing the pneumatic impact valve at a high frequency through the controller, the piston vibrates by moving left and right at high frequency. This causes the sealing ring on the piston to fit more tightly against the piston rod, improving sealing and reducing leakage.

[0058] P3: After the high-frequency vibration is completed, the solenoid valve (e.g., the first two-way solenoid valve 14) corresponding to the control working chamber (e.g., the first working chamber) is energized, the detection pipeline is opened, so that compressed air flows into the throttle, and after the throttling effect of the throttle, it enters the corresponding working chamber of the hydraulic clutch being tested through the solenoid valve, so that the pressure in the working chamber increases.

[0059] P4: Once the pressure inside the working chamber reaches the preset value, the solenoid valve is de-energized, and the working chamber enters a pressure-holding state. During the pressure-holding process, the pressure inside the working chamber decreases slightly due to leakage.

[0060] P5: After setting the pressure holding time, calculate the leakage of the working chamber and obtain the airtightness test result of the working chamber based on the leakage, thus completing the airtightness test of one of the working chambers. If the leakage is less than the threshold, the sealing performance is qualified; otherwise, the sealing performance is unqualified.

[0061] Preferably, the controller is a PLC controller. After the PLC controller completes the airtightness test in one of the working chambers, it automatically controls the airtightness test system to perform airtightness test in the other working chamber according to the above steps, thereby realizing fully automatic airtightness test.

[0062] As an example, the aforementioned airtightness testing system is installed at the production site, and its structure is as follows: Figure 2 As shown, based on the above, the airtightness testing system also includes a sliding frame 21 mounted above the clutch production line, a first connecting seat 23 suspended below the sliding frame 21, and a testing chamber (not shown in the figure) separately from the first connecting seat 23. A balancer 22 is installed on the rope between the sliding frame 21 and the first connecting seat 23. The sliding frame 21 includes a transverse slide rail and a longitudinal slide rail. The first connecting seat 23 can slide in both the longitudinal and transverse directions to move it directly above the hydraulic clutch output from the production line for convenient testing. The testing chamber contains a pipe connected to the air source 60, a portion of the testing pipeline, and a portion of the impact pipeline. A one-way valve, airflow regulating and testing device, and a solenoid valve are also located within the testing chamber.

[0063] The first connecting seat is provided with a first air inlet for the first working chamber and a second air inlet for the second working chamber. The first air inlet and the second air inlet are respectively connected to the impact pipeline and the detection pipeline of the corresponding working chamber.

[0064] As an example, such as Figure 3 As shown, the lower part of the first connecting seat 23 is provided with a slot 239 for connecting to the end of the hydraulic clutch, and the two opposite side walls of the slot are respectively provided with a first air inlet 233 and a second air inlet 234.

[0065] The first connecting seat 23 and the detection chamber are respectively provided with a portion of the detection pipeline for the first working chamber and the second working chamber. The detection pipelines on the first connecting seat 23 for the first working chamber and the second working chamber are respectively connected to the first air inlet and the second air inlet. Specifically, a horizontal first pipe 236 is provided between the first air inlet 233 and the left side wall of the first connecting seat 23, and a first connection port 237 is formed at the end of the first pipe 236. The first connection port 237 is connected to the corresponding first two-way solenoid valve 14 in the detection chamber through a connector and a gas pipe to form a detection pipeline for the first working chamber.

[0066] The first connecting seat 23 and the detection chamber are respectively provided with a portion of the impact pipeline for the first working chamber and the second working chamber. The impact pipeline inside the detection chamber is connected to a compressed air source outside the detection chamber. Specifically, a vertical second pipe 235 is provided at the left end of the upper side wall of the first connecting seat 23. The middle part of the second pipe 235 is connected to the middle part of the first pipe 236. The upper end of the second pipe 235 is provided with a second connection port 231, which is connected to the first pneumatic impact valve 12, so that the second pipe 235 and the first pipe 236 constitute a portion of the impact pipeline for the first working chamber. The first pneumatic impact valve 12 is connected to the air source 60 in sequence through the pipeline outside the detection chamber and the impact pipeline inside the detection chamber.

[0067] The right end of the upper side wall of the first connecting seat 23 is symmetrically provided with impact pipes and detection pipes that are connected to the second working chamber.

[0068] In the working state, the end of the hydraulic clutch under test that has an oil inlet (including a first oil inlet communicating with the first working chamber and a second oil inlet communicating with the second working chamber; in this application, the oil inlet is used for air intake) is inserted into the slot of the first connecting seat, so that the first air inlet is aligned with the first oil inlet of the hydraulic clutch, and the second air inlet is aligned with the second oil inlet of the hydraulic clutch, so that the first air inlet is connected to the first working chamber of the hydraulic clutch under test, and the second air inlet is connected to the second working chamber of the hydraulic clutch under test, thereby connecting the impact pipe and the detection pipe of the first working chamber to the first working chamber of the hydraulic clutch under test, and connecting the impact pipe and the detection pipe of the second working chamber to the second working chamber of the hydraulic clutch under test.

[0069] In this embodiment, the leakage amount is calculated based on the change in pressure gauge 17 at the end of the pressure holding period. As an example, the ratio of the pressure change to the pressure at the start of the pressure holding period is used as the leakage amount.

[0070] As another embodiment, the airtightness testing system for the aforementioned hydraulic clutch is installed in a laboratory. The airtightness testing system further includes a sealed container of a fixed capacity. The sealed container is provided with a second connecting seat, which has a first connecting head for a first working chamber and a second connecting head for a second working chamber. The first and second connecting heads are respectively connected to a first oil inlet on the hydraulic clutch that communicates with the first working chamber and a second oil inlet that communicates with the second working chamber, as well as a testing pipeline outside the sealed container corresponding to the working chamber.

[0071] As an example, based on the above, Figure 4 An example within a laboratory setting is shown. Figure 4 As shown, the sealed container 31 is equipped with a second pressure gauge 33 and a second pressure transmitter 32, with the second pressure transmitter 32 connected to the controller signal. The airflow regulation and detection device on the detection main pipe includes an air source triplet 34, a precision pressure regulating valve 35, and a fixed throttle 38. A third pressure gauge 36 and a third pressure transmitter 37 are positioned between the precision pressure regulating valve 35 and the fixed throttle 38.

[0072] In this embodiment, the solenoid valve is a three-position five-way directional valve. Specifically, a three-position five-way directional valve is provided at the end of the main detection pipe, with its first and second positions connected to the ends of two detection branch pipes, respectively. The other ends of the two detection branch pipes are connected to a first connector and a second connector, respectively. When the three-position five-way directional valve is in the third position, neither of the two detection branch pipes is conductive. In this embodiment, when using the detection pipeline for detection, the controller controls the three-position five-way directional valve to open the detection pipeline of the target working chamber, injecting compressed air into the target working chamber (see above regarding...). Figure 1(As explained), after the gas pressure in the working chamber reaches the preset value, the pressure holding test begins. Due to clutch leakage, during the pressure holding process, gas leaks from the hydraulic clutch into the sealed container, causing the pressure value in the sealed container to gradually increase, and the value of the second pressure gauge 33 to change. When calculating the leakage amount, the leakage amount is calculated based on the change value of the second pressure gauge 33 at the end of the pressure holding process.

[0073] Preferably, in Figure 4 Based on the illustrated embodiment, an impact pipeline for the first working chamber and an impact pipeline for the second working chamber are respectively provided between the first connector and the air source 60 and between the second connector and the air source 60. These impact pipelines are equipped with a one-way valve and a pneumatic impact valve. The impact vibration principle is explained in the above description. Figure 1 Explanation.

[0074] As another example, an airtightness testing system in the laboratory, such as Figure 5 As shown, a second pressure gauge 42 and a second pressure transmitter 43 are provided on the sealed container 41, and the second pressure transmitter 43 is connected to the controller signal. The airflow regulation and detection device on the detection main pipe includes an air source triplet 45, a precision pressure regulating valve 46, and a fixed throttle 49. A fourth pressure gauge 47 and a fourth pressure transmitter 48 are positioned between the precision pressure regulating valve 46 and the fixed throttle 49. A three-position five-way directional valve is provided at the end of the detection main pipe. Its first and second positions are respectively connected to the ends of two detection branch pipes, and the other ends of the two detection branch pipes are respectively connected to a first connector and a second connector. When the three-position five-way directional valve is in the third position, neither detection branch pipe is conductive. Furthermore, a weighing sensor 44 is provided below the sealed container 41, and the weighing sensor 44 is connected to the controller signal. In this embodiment, when using the detection pipeline for detection, the controller controls the three-position five-way directional valve to open the detection pipeline of the target working chamber, injecting compressed air into the target working chamber (see above regarding...). Figure 1 (As explained), after the gas pressure in the working chamber reaches the preset value, pressure holding detection begins. Due to clutch leakage, during the pressure holding process, gas leaks from the hydraulic clutch into the sealed container, causing the pressure value in the sealed container to gradually increase, the total mass of air in the sealed container to gradually increase, and the mass value detected by the weighing sensor 44 to gradually increase. When calculating the leakage amount, the leakage amount is calculated based on the change value of the weighing sensor 44 at the end of the pressure holding process.

[0075] Preferably, in Figure 5 Based on the illustrated embodiment, an impact pipeline for the first working chamber and an impact pipeline for the second working chamber are respectively provided between the first connector and the air source 60 and between the second connector and the air source 60. These impact pipelines are equipped with a one-way valve and a pneumatic impact valve. The impact vibration principle is explained in the above description. Figure 1 Explanation.

[0076] The beneficial effects of this application are as follows:

[0077] 1. The instrument consumes less than 100 watts, with no electrical energy consumption; compressed air consumption is approximately 100L per unit, which is negligible. There is no oil consumption during the test, eliminating the need for regular oil replacement, replenishment, and purification. This reduces the cost of test oil and oil purification consumables, enabling clean production for hydraulic clutch factory testing. Furthermore, it eliminates the oil draining process required for oil testing, avoiding site and production line contamination caused by oil testing, and also reduces the workload of instrument maintenance.

[0078] 2. Good appearance: The airtightness testing system is set up at the edge of the production line. The testing box is small in size, occupying an area of ​​about 0.5㎡. The connecting seat adopts a hanging installation, which does not occupy any space and improves the appearance of the workshop production line.

[0079] 3. Low labor intensity: In the production site embodiment, when the completed clutch flows to the testing station, the operator pulls down the test fixture, puts it into the clutch under test, and presses the test button to complete the test. There is no need to carry the clutch to the testing site outside the production line, which greatly reduces labor intensity.

[0080] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A system for detecting the airtightness of a hydraulic clutch, characterized in that, Includes a controller, impact lines and detection lines communicating with each working chamber of the hydraulic clutch; The other end of the impact pipeline is connected to a gas source, and the impact pipeline is equipped with a one-way valve and a pneumatic impact valve; The detection pipeline includes a main detection pipe shared by two working chambers and a detection branch pipe disposed between the main detection pipe and the corresponding working chamber; the other end of the main detection pipe is connected to the air source, and the main detection pipe is equipped with an airflow regulating and detection device, a first pressure gauge and a first pressure transmitter, and the detection branch pipe is equipped with a solenoid valve; The controller is signal-connected to the first pressure transmitter, the pneumatic impact valve, the actuator of the airflow regulating and detection device, and the solenoid valve. The airtightness testing system also includes a sliding frame mounted above the clutch production line, a first connecting seat suspended below the sliding frame, and a testing box separately from the first connecting seat; The first connecting seat is provided with a slot for connecting to the end of the hydraulic clutch. The two opposite side walls of the slot are respectively provided with a first air inlet for the first working chamber and a second air inlet for the second working chamber. The first air inlet and the second air inlet are respectively connected to the impact pipe and the detection pipe of the corresponding working chamber. In operation, the first air inlet is connected to the first working chamber of the hydraulic clutch being tested, and the second air inlet is connected to the second working chamber of the hydraulic clutch being tested.

2. The airtightness testing system for a hydraulic clutch according to claim 1, characterized in that, The airtightness testing system also includes a sealed container, on which a second connecting seat is provided. The second connecting seat is provided with a first connecting head for the first working chamber and a second connecting head for the second working chamber. The first connecting head and the second connecting head are respectively connected to a first oil inlet on the hydraulic clutch that communicates with the first working chamber and a second oil inlet that communicates with the second working chamber, as well as to the impact pipeline and detection pipeline of the corresponding working chamber outside the sealed container.

3. The airtightness testing system for a hydraulic clutch according to claim 2, characterized in that, The sealed container is equipped with a second pressure gauge and a second pressure transmitter, and the second pressure transmitter is signal-connected to the controller.

4. The airtightness testing system for a hydraulic clutch according to claim 1, characterized in that, The airflow regulation and detection device includes one or more of the following: filter, throttle, pressure regulating valve, air source triplet, and flow meter.

5. The airtightness testing system for a hydraulic clutch according to claim 1, characterized in that, The controller is a PLC controller.

6. A method for testing the air tightness of a hydraulic clutch using a system for testing the air tightness of a hydraulic clutch according to any one of claims 1-5, characterized in that, include: One of the pneumatic impact valves is energized at high frequency, the impact pipeline is opened, and compressed air enters the corresponding working chamber of the hydraulic clutch being tested through the pneumatic impact valve and the check valve. The pneumatic impact valve is de-energized and energized according to a preset time interval and a preset number of vibrations, and the pneumatic impact valve is de-energized after the preset number of vibrations is reached. The solenoid valve corresponding to the working chamber is energized, the detection pipeline is opened, and compressed air enters the corresponding working chamber of the hydraulic clutch being detected through the airflow regulation and detection device and the solenoid valve. Once the pressure inside the working chamber reaches a preset value, the solenoid valve is de-energized, and the working chamber enters a pressure-holding state. After setting the pressure holding time, the leakage of the working chamber is calculated, and the airtightness test result of the working chamber is obtained based on the leakage.

7. The method for testing the airtightness of a hydraulic clutch according to claim 6, characterized in that, Calculate the leakage amount, including: The leakage amount is calculated based on the change in the first pressure gauge value at the end of the pressure holding period.

8. The method for testing the airtightness of a hydraulic clutch according to claim 6, characterized in that, Calculate the leakage amount, including: The leakage amount is calculated based on the change in the second pressure gauge at the end of the pressure holding period.

9. The method for testing the airtightness of a hydraulic clutch according to claim 6, characterized in that, After one working chamber completes the airtightness test, the airtightness test of the other working chamber is automatically controlled.

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