Cab suspension hydraulic seal detection system and method

Abstract

The present invention provides a cab suspension hydraulic seal detection system and method, which includes a hydraulic seal detection part, a pressure sensor and a PLC control part; the hydraulic seal detection part performs hydraulic seal detection on the cab suspension by measuring the change of hydraulic oil pressure; the pressure sensor is used to detect the oil pressure change inside the tested kit; the hydraulic seal detection part is directly connected to the PLC control part, and the detection process is completed through the electric control signal input by the touch screen connected to the PLC control part. This detection system is used for the hydraulic seal performance detection of the cab suspension, and has a high degree of automation, simple operation and high detection accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of automobile cab suspension sealing performance detection devices, and in particular to a cab suspension hydraulic sealing detection system and method. Background Art

[0002] The car's cab suspension system requires hydraulic components. In order to ensure the quality of the suspension, the suspension needs to be tested for hydraulic tightness before leaving the factory. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a cab suspension hydraulic seal detection system, which is used for cab suspension hydraulic seal performance detection, has a high degree of automation, is easy to operate, and has high detection accuracy.

[0004] In order to realize the above-mentioned technical features, the purpose of the present invention is realized as follows: a cab suspension hydraulic sealing detection system, which includes a hydraulic sealing detection part, a pressure sensor and a PLC control part; the hydraulic sealing detection part performs hydraulic sealing detection on the cab suspension by measuring the change of hydraulic oil pressure; the pressure sensor is used to detect the oil pressure change inside the test kit; the hydraulic sealing detection part is directly connected to the PLC control part, and completes the detection process through the electrical control signal input by the touch screen connected to the PLC control part.

[0005] The hydraulic sealing detection part includes an oil supply system for providing stable hydraulic oil, and a plurality of branch detection circuits with the same structure are connected in parallel after the oil supply system, and each of the branch detection circuits is respectively connected to a pressure sensor and a product to be detected.

[0006] The oil supply system includes an oil tank, which is connected to a high- and low-pressure dual pump through an oil filter. The high- and low-pressure dual pump is connected to an electric motor for driving the pump oil. A first overflow valve and a unloading solenoid valve assembly are connected to the oil outlet circuit of the high- and low-pressure dual pump.

[0007] The unloading solenoid valve assembly comprises a two-position two-way solenoid valve and a second relief valve, and a pressure gauge is installed between the high-low pressure dual pump and the second relief valve.

[0008] The branch detection circuit includes multiple groups of three-position four-way solenoid valves and hydraulically controlled one-way valves; the three-position four-way solenoid valves and hydraulically controlled one-way valves realize the process of oil pressure pressurization, oil pressure maintenance and oil pressure relief by controlling the flow rate and flow direction of hydraulic oil;

[0009] A pressure sensor is installed on each branch detection circuit. The pressure sensor is arranged on the pipeline between the hydraulically controlled one-way valve and the tested kit to detect the oil pressure change inside the tested kit.

[0010] The PLC control part includes a PLC controller, the output module of the PLC controller is connected to all three-position four-way solenoid valves of the hydraulic sealing detection part, and controls the on and off of the corresponding solenoid valves; the output module of the PLC controller is connected to an indicator light, and determines whether the hydraulic oil in the test kit is leaking, and issues a leakage alarm; the input module of the PLC controller is connected to all pressure sensors and switch quantities of the hydraulic sealing detection part, and is used to collect pressure signals from pressure sensors and control the on and off of various parts of the equipment; the input and output parts of the PLC controller are both connected to a touch screen and a communication module, the touch screen is used to display detection data in real time and set system parameters, and the communication module is used to collect and record product detection information; it also includes a power supply module.

[0011] The method for performing hydraulic sealing detection by the cab suspension air pressure sealing detection test system comprises the following steps:

[0012] Step 1: Preparation for power-on self-test;

[0013] Step 2: Oil pressure pressurization stage;

[0014] Step 3: Oil pressure holding stage;

[0015] Step 4: Oil pressure relief phase.

[0016] Specific operations of step 1: Before the detection task begins, the operator needs to ensure that the system is in an unloaded state and the pipelines and equipment are well connected. The operator transmits a signal to the PLC controller by pressing the start button on the control touch screen. At this time, the pressurization indicator light on the touch screen lights up, and then the oil pressure is increased, the pressure is stabilized, and the oil pressure is relieved after a delay of T1s according to the program set in the PLC controller, and then a judgment is made as to whether the test kit is qualified.

[0017] Specific operation of step 2: debug the system through the touch screen, set the corresponding parameters, and then use the motor to drive the high and low pressure dual pumps to pressurize the hydraulic oil into the test kit. At this time, the middle position function is that the valve core moves to the right after the three-position four-way solenoid valve is energized, and moves from the middle position to the right position. The oil inlet P is connected with the working oil port A, and the oil return port T is connected with the working oil port B. The hydraulic oil flows from the oil inlet P to the working oil port A, and then flows into the hydraulically controlled one-way valve. At this time, the control oil port of the hydraulically controlled one-way valve does not flow into the hydraulic oil, which is equivalent to an ordinary one-way valve. The hydraulic oil flows from the oil inlet of the hydraulically controlled one-way valve to the oil return port, and then flows into the test kit, realizing the pressurization process of the test kit. The pressurization time of this process is T2s, or the pressurization time can be set by yourself through the touch screen as required.

[0018] The specific operation of step 3 is as follows: according to the oil pressure pressurization time and pressure set by the system, the tested kit is pressurized to the set pressure and then the pressure is maintained. The tested kit enters the pressure holding process. The pressure holding time of this process is T3s. The pressure holding indicator light on the touch screen lights up, or the pressure holding time can be set according to the requirements. The pressure value detected by the pressure sensor will be displayed on the touch screen in real time. If the pressure value fluctuates within the set range, it is considered to be qualified, and then proceed to the next step. If there is a pressure leak, the system will quickly issue an alarm prompt and the system will stop testing.

[0019] Specific operation of step 4: After the tested kit completes the voltage stabilization test, the middle position function is that the valve core moves left after the three-position four-way solenoid valve is energized, and moves from the right position to the left position, the oil inlet P is connected with the working oil port B, and the oil return port T is connected with the working oil port A, and the hydraulic oil flows from the oil inlet P to the working oil port B, and then the hydraulic oil is introduced into the control oil port of the hydraulic control one-way valve, so that the oil inlet and the oil return port of the hydraulic control one-way valve are connected, and the hydraulic oil in the tested kit flows back to the oil inlet from the return oil port of the hydraulic control one-way valve. Since a small amount of gas inside the oil pipeline is compressed after being pressurized by oil pressure, when the pressure inside the tested kit is unloaded to zero, the gas rebounds to make the hydraulic oil automatically return to the oil tank, realizing the pressure relief process of the covered test piece. The pressure relief time of this process is T4s, or the pressure relief time can be set by the touch screen as required. After the pressure relief process is completed, the pressure relief indicator light on the touch screen lights up, and after the detection task is completed, the motor stops, the tested kit is disassembled, and then the sealing test of the next product is carried out.

[0020] The present invention has the following beneficial effects:

[0021] 1. The present invention tests the hydraulic tightness of the cab suspension by measuring the change of hydraulic oil pressure. It can test 6 suspension assemblies at the same time. The PLC control part controls the electromagnetic valve to complete the on-off and flow direction of the system pipeline through the electric control signal input by the touch screen. The pressure sensor collects the signal inside the test kit through the PLC control part, and then transmits the signal to the PLC control part to make a logical judgment on whether the signal is qualified. The PLC control part can automatically complete the control action and logical judgment of the system, and display the pressure inside the test kit in real time on the touch screen. The system maintenance parameter modification and alarm prompt can be realized on the touch screen. It has a reasonable structure, simple operation, and is applicable to a variety of products. It can efficiently and accurately detect the sealing performance of the product, ensure the quality of the product, reduce the labor intensity of the operator and the subjectivity of the test results, and extend the service life of the workpiece.

[0022] 2. This detection system has a reasonable structure, simple operation, and is applicable to a variety of products. It can efficiently and accurately detect the sealing performance of products, ensure product quality, reduce the labor intensity of operators and the subjectivity of detection results, and extend the service life of workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 This is a system structure diagram of the present invention.

[0025] Figure 2 This is a schematic diagram of the system of the present invention.

[0026] Figure 3 For the present invention Figure 2 Diagram of the oil supply system.

[0027] Figure 4 For the present invention Figure 2 Middle branch detection circuit system diagram.

[0028] Figure 5 This is a timing diagram of the solenoid valve operation in the system of the present invention.

[0029] Figure 6 This is a diagram showing the connection structure of the controller and the touch screen of the present invention.

[0030] Figure 7 This is a schematic diagram of the controller port wiring of the present invention.

[0031] Figure 8 This is a flow chart of the hydraulic sealing detection part of the present invention.

[0032] Fig. 9 This is the main menu screen of the touch screen of the present invention.

[0033] Fig.10 This is the pressure control screen of the touch screen of the present invention.

[0034] Fig.11 It is the system maintenance screen of the touch screen of the present invention.

[0035] In the figure: oil tank 1, oil filter 2, high and low pressure dual pump 3, first relief valve 4, pressure gauge 5, second relief valve 6, unloading solenoid valve assembly 7, two-position two-way solenoid valve 8, three-position four-way solenoid valve 9, hydraulically controlled one-way valve 10, test kit 11, pressure sensor 12, PLC controller 13, communication module 14, touch screen 15, power module 16, indicator light 17. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0037] Embodiment 1:

[0038] See also Figure 1-7, a cab suspension hydraulic seal detection system, which includes a hydraulic seal detection part, a pressure sensor and a PLC control part; the hydraulic seal detection part performs hydraulic seal detection on the cab suspension by measuring the change of hydraulic oil pressure; the pressure sensor is used to detect the oil pressure change inside the test kit; the hydraulic seal detection part is directly connected to the PLC control part, and the detection process is completed through the electric control signal input by the touch screen connected to the PLC control part. By adopting the above detection system, the test kit is the cab suspension, and the detection process is controlled by the PLC control part through the electric control signal input by the touch screen to control the reversing of the solenoid valve to control the flow and direction of the hydraulic oil in the oil circuit, thereby realizing the detection process of oil pressure pressurization, oil pressure maintenance and oil pressure relief, the pressure sensor collects the pressure signal inside the test kit through the PLC control part, and the PLC control part performs logical judgment on whether the collected pressure signal is qualified, the PLC control part can automatically complete the control action and logical judgment of the system, and display the pressure inside the test kit in real time on the touch screen, and the system maintenance parameter modification and alarm prompt can be realized on the touch screen.

[0039] Furthermore, the hydraulic sealing detection part includes an oil supply system for providing stable hydraulic oil, and a plurality of branch detection circuits with the same structure are connected in parallel after the oil supply system, and each of the branch detection circuits is respectively connected to a pressure sensor and a product to be detected.

[0040] Furthermore, the oil supply system includes an oil tank 1, which is connected to a high-low pressure dual pump 3 through an oil filter 2, and the high-low pressure dual pump 3 is connected to a motor for driving the pump oil, and the oil outlet circuit of the high-low pressure dual pump 3 is connected to a first overflow valve 4 and a load-relief solenoid valve assembly 7. The above-mentioned oil supply system constitutes a stable high-pressure hydraulic oil source to provide a high-pressure working medium for the system. To ensure normal testing, the hydraulic oil source pressure needs to reach 35MPa.

[0041] Furthermore, the unloading solenoid valve assembly 7 includes a two-position two-way solenoid valve 8 and a second relief valve 6, and a pressure gauge 5 is installed between the high-low pressure dual pump 3 and the second relief valve 6. The relief valve and unloading solenoid valve assembly 7 are used for unloading the pump to ensure that the system does not cause accidents due to excessive pressure.

[0042] Furthermore, the branch detection circuit includes multiple groups of three-position four-way solenoid valves 9 and hydraulically controlled one-way valves 10; the three-position four-way solenoid valves 9 and hydraulically controlled one-way valves 10 realize the process of oil pressure pressurization, oil pressure maintenance, and oil pressure relief by controlling the flow rate and flow direction of the hydraulic oil; a pressure sensor 12 is installed on each branch detection circuit, and the pressure sensor 12 is arranged on the pipeline between the hydraulically controlled one-way valve 10 and the test kit 11, and is used to detect the oil pressure changes inside the test kit.

[0043] Furthermore, the PLC control part includes a PLC controller 13, the output module of the PLC controller 13 is connected to all the three-position four-way solenoid valves 9 of the hydraulic sealing detection part, and controls the on and off of the corresponding solenoid valves; the output module of the PLC controller 13 is connected to an indicator light 17, and determines whether the hydraulic oil in the test kit is leaking, and issues a leakage alarm; the input module of the PLC controller 13 is connected to all the pressure sensors 12 and the switch quantity of the hydraulic sealing detection part, and is used to collect the pressure signals of the pressure sensors and control the on and off of various parts of the equipment; the input and output parts of the PLC controller 13 are connected to the touch screen 15 and the communication module 14, the touch screen 15 is used to display the detection data in real time and set the system parameters, and the communication module 14 is used to collect and record the product detection information; it also includes a power supply module 16.

[0044] Embodiment 2:

[0045] See also Figure 8 The method for performing hydraulic sealing detection by the cab suspension air pressure sealing detection test system comprises the following steps:

[0046] Step 1: Preparation for power-on self-test; before starting the test task, the operator needs to ensure that the system is in an unloaded state and the pipeline and equipment are connected in good condition. The operator transmits a signal to the PLC controller 13 by controlling the start button on the touch screen 15. At this time, the pressurization indicator light on the touch screen lights up, and then according to the program set in the PLC controller, oil pressure pressurization, voltage stabilization detection, and oil pressure relief are executed after a delay of T1s, and then a judgment is made on whether the test kit is qualified.

[0047] Step 2: Oil pressure pressurization stage; debug the system through the touch screen 15, set the corresponding parameters, and then drive the high and low pressure dual pumps 3 through the motor to pressurize the hydraulic oil into the test kit. At this time, the three-position four-way solenoid valve 9 with a Y-type mid-position function moves right after being energized, and moves from the mid-position to the right position. The oil inlet P is connected with the working oil port A, and the oil return port T is connected with the working oil port B. The hydraulic oil flows from the oil inlet P to the working oil port A, and then flows into the hydraulic control one-way valve 10. At this time, the control oil port of the hydraulic control one-way valve does not flow into the hydraulic oil, which is equivalent to an ordinary one-way valve. The hydraulic oil flows from the oil inlet of the hydraulic control one-way valve to the oil return port, and then flows into the test kit, realizing the pressurization process of the test kit. The pressurization time of this process is T2s, or the pressurization time can be set according to requirements.

[0048] Step 3: Oil pressure holding stage; according to the oil pressure pressurization time and pressure set by the system, the tested kit is pressurized to the set pressure and then the pressure is maintained. The tested kit enters the pressure holding process. The pressure holding time of this process is T3s. The pressure holding indicator light on the touch screen lights up, or the pressure holding time can be set according to the requirements. The pressure value detected by the pressure sensor 12 will be displayed on the touch screen in real time. If the pressure value fluctuates within the set range, it is considered to be qualified, and then proceed to the next step. If there is a pressure leak, the system will quickly issue an alarm prompt and the system will stop testing;

[0049] Step 4: Oil pressure relief stage; after the tested set completes the pressure stabilization test, the middle position function is that the valve core moves left after the three-position four-way solenoid valve 9 is energized, and moves from the right position to the left position, the oil inlet P is connected with the working oil port B, and the oil return port T is connected with the working oil port A, and the hydraulic oil flows from the oil inlet P to the working oil port B, and then the hydraulic oil is introduced into the control oil port of the hydraulic control check valve, so that the oil inlet and the oil return port of the hydraulic control check valve are connected, and the hydraulic oil in the tested set flows back to the oil inlet from the return oil port of the hydraulic control check valve. Since a small amount of gas inside the oil pipeline is compressed after being pressurized by oil pressure, when the pressure inside the tested set is unloaded to zero, the gas rebounds to make the hydraulic oil automatically return to the oil tank, realizing the pressure relief process of the set. The pressure relief time of this process is T4s, or the pressure relief time can be set according to requirements. After the pressure relief process is completed, the pressure relief indicator light on the touch screen lights up, and the detection task is completed, the motor stops, the tested set is disassembled, and then the sealing test of the next product is carried out.

[0050] Embodiment 3:

[0051] Test operation process

[0052] Before the test task begins, the operator needs to ensure that the system is in an unloaded state and the pipeline and equipment are connected in good condition. The operator transmits the signal to the PLC controller by pressing the start button on the touch screen. At this time, the pressurization indicator light on the touch screen lights up (green). Then, according to the program set in the PLC controller, after a delay of 3s, the oil pressure pressurization, pressure stabilization test, and oil pressure relief are executed, and then a judgment is made on whether the tested kit is qualified. The specific test steps are as follows:

[0053] 1) Oil pressure pressurization: debug the system through the touch screen, set the corresponding parameters, and then drive the hydraulic pump through the motor to pressurize the hydraulic oil into the test kit. At this time, the middle position function is that the L-type three-position four-way solenoid valve IV1~IV6 moves to the right after being energized, and moves from the middle position to the right position. The oil inlet P is connected with the working oil port A, and the oil return port T is connected with the working oil port B. The hydraulic oil flows from the oil inlet P to the working oil port A, and then flows into the hydraulic control check valve 0V8~0V12. At this time, the control oil port of the hydraulic control check valve does not flow into the hydraulic oil, which is equivalent to an ordinary check valve. The hydraulic oil flows from the oil inlet of the hydraulic control check valve to the oil return port, and then flows into the test kit to realize the pressurization process of the test kit. The pressurization time of this process is 50s, and the pressurization time can be set according to requirements.

[0054] 2) Oil pressure holding: According to the oil pressure pressurization time and pressure set by the system, the tested kit is pressurized to the set pressure and then maintains the pressure. The tested kit enters the pressure holding process. The pressure holding time of this process is 60s. The pressure holding indicator light on the touch screen lights up (yellow). The pressure holding time can be set according to the requirements. The pressure value detected by the pressure sensor 0S1~0S6 will be displayed on the touch screen in real time. If the pressure value fluctuates within the set range, it is considered to be qualified and the next step will be carried out. If there is a pressure leak, the system will quickly issue an alarm prompt and the system will stop testing.

[0055] 3) Oil pressure relief: After the tested set completes the pressure stabilization test, the middle position function is that the L-type three-position four-way solenoid valve 0Y1~0Y6 is energized, and the valve core moves to the left, from the right position to the left position, the oil inlet P is connected with the working oil port B, and the oil return port T is connected with the working oil port A, and the hydraulic oil flows from the oil inlet P to the working oil port B, and then the hydraulic oil is introduced into the control oil port of the hydraulic control check valve, so that the oil inlet and the oil return port of the hydraulic control check valve are connected, and the hydraulic oil in the tested set flows back to the oil inlet from the return oil port of the hydraulic control check valve. Since there is a small amount of gas inside the oil pipeline and is compressed after being pressurized by oil pressure, when the pressure inside the tested set is unloaded to zero, the gas rebounds to make the hydraulic oil automatically return to the oil tank, realizing the pressure relief process of the set. The pressure relief time of this process is 10s, and the pressure relief time can be set according to requirements. After the pressure relief process is completed, the pressure relief indicator light on the touch screen lights up (red). After the test task is completed, the motor stops, the test kit is disassembled, and then the sealing test of the next product is carried out.

[0056] Embodiment 4:

[0057] In this example implementation, the specific system parameters are set as follows:

[0058] The test pressure of the tested kit is 36Mpa;

[0059] The flow rate of the overall loop test machine is 1L / Min;

[0060] The rated test time for each unit is 2 minutes;

[0061] The oil pressure pressurization time is 50S;

[0062] The oil pressure holding time is 60S;

[0063] The oil pressure relief time is 10S;

[0064] Embodiment 5:

[0065] See also Figure 9-11 ,

[0066] The sealing detection system can test 6 rear suspension assemblies at the same time. The system maintenance and parameter setting of the hydraulic detection part are all carried out on the touch screen. The three functional modules displayed on the touch screen include pressure control, maintenance screen, and alarm screen. The specific introduction of the functional modules is as follows:

[0067] 1) Pressure control: This function module uses a digital display instrument to display the pressure drop before and after the pressure test. The pressure sensor on the sealing test machine displays the pressure value inside the test kit during the sealing test on the touch screen in real time through the PLC control part.

[0068] 2) Maintenance screen: This function module is a parameter setting module, which can set the oil pressure increase time, oil pressure relief time, and the number of oil circuit activations.

[0069] 3) Alarm screen: This function module is to set the pressure to zero within the set pressure resistance time. When the pressure exceeds the set value, an audible and visual alarm will be issued, and each circuit will display the pressure drop independently. The test machine has a timed power-off function: after the rated time is completed, the power will be automatically cut off and the pressure drop will be displayed. If there is obvious leakage observed by the naked eye within a unit time, an emergency stop can be performed. When a jet-like leakage occurs that may cause harm to people, the system will immediately stop providing pressure.

Claims

1. Cab suspension hydraulic seal detection system, characterized by: It includes a hydraulic sealing detection part, a pressure sensor and a PLC control part; the hydraulic sealing detection part performs hydraulic sealing detection on the cab suspension by measuring the change of hydraulic oil pressure; the pressure sensor is used to detect the oil pressure change inside the tested kit; the hydraulic sealing detection part is directly connected to the PLC control part, and completes the detection process through the electric control signal input by the touch screen connected to the PLC control part; The hydraulic sealing detection part includes an oil supply system for providing stable hydraulic oil, and a plurality of branch detection circuits of the same structure are connected in parallel after the oil supply system, and each branch detection circuit is respectively connected to a pressure sensor and a product to be detected; The oil supply system comprises an oil tank (1), the oil tank (1) is connected to a high-low pressure dual pump (3) through an oil filter (2), the high-low pressure dual pump (3) is connected to an electric motor for driving the pump oil, and the oil outlet circuit of the high-low pressure dual pump (3) is connected to a first overflow valve (4) and a load-relief solenoid valve assembly (7); The unloading solenoid valve assembly (7) comprises a two-position two-way solenoid valve (8) and a second relief valve (6), and a pressure gauge (5) is installed between the high- and low-pressure dual pump (3) and the second relief valve (6); The branch detection circuit comprises a plurality of sets of three-position four-way solenoid valves (9) and hydraulically controlled one-way valves (10); the three-position four-way solenoid valves (9) and hydraulically controlled one-way valves (10) realize the process of oil pressure pressurization, oil pressure maintenance and oil pressure relief by controlling the flow rate and flow direction of hydraulic oil; A pressure sensor (12) is installed on each branch detection circuit. The pressure sensor (12) is arranged on the pipeline between the hydraulically controlled one-way valve (10) and the test kit (11) and is used to detect changes in the oil pressure inside the test kit. The PLC control part comprises a PLC controller (13), wherein an output module of the PLC controller (13) is connected to all three-position four-way solenoid valves (9) of the hydraulic sealing detection part and controls the on and off of the corresponding solenoid valves; the output module of the PLC controller (13) is connected to an indicator light (17), and determines whether the hydraulic oil in the test kit is leaking, and issues a leakage alarm; the input module of the PLC controller (13) is connected to all pressure sensors (12) and switch quantities of the hydraulic sealing detection part, and is used to collect pressure signals of the pressure sensors and control the on and off of various parts of the equipment; the input and output parts of the PLC controller (13) are both connected to a touch screen (15) and a communication module (14), wherein the touch screen (15) is used to display detection data in real time and set system parameters, and the communication module (14) is used to collect, record and summarize product detection information; and a power supply module (16) is also included.

2. A method for testing hydraulic sealing performance using the cab suspension hydraulic sealing testing system of claim 1, characterized in that It includes the following steps: Step 1: Preparation for power-on self-test; Step 2: Oil pressure pressurization stage; Step 3: Oil pressure holding stage; Step 4: Oil pressure relief phase.

3. The detection method of the cab suspension hydraulic seal detection system according to claim 2 is characterized in that: The specific operation of step 1 is as follows: before the detection task begins, the operator needs to ensure that the system is in a unloaded state and the pipeline and equipment are connected in a good state. The operator transmits a signal to the PLC controller (13) by pressing the start button on the control touch screen (15). At this time, the pressurization indicator light on the touch screen lights up, and then according to the program set in the PLC controller, the oil pressure is pressurized, the pressure is stabilized, and the oil pressure is relieved after a delay of T1s, and then a judgment is made as to whether the tested kit is qualified.

4. The detection method of the cab suspension hydraulic seal detection system according to claim 2 is characterized in that: The specific operation of step 2 is as follows: the system is debugged through the touch screen (15), and after the corresponding parameters are set, the high and low pressure dual pumps (3) are driven by the motor to pressurize the hydraulic oil into the test kit. At this time, the middle position function is that the valve core of the three-position four-way solenoid valve (9) moves to the right after being energized, and moves from the middle position to the right position. The oil inlet P is connected with the working oil port A, and the oil return port T is connected with the working oil port B. The hydraulic oil flows from the oil inlet P to the working oil port A, and then flows into the hydraulic control check valve (10). At this time, the control oil port of the hydraulic control check valve does not flow into the hydraulic oil, which is equivalent to an ordinary check valve. The hydraulic oil flows from the oil inlet of the hydraulic control check valve to the oil return port, and then flows into the test kit, realizing the pressurization process of the test kit. The pressurization time of this process is T2s, or the pressurization time can be set by the touch screen according to requirements.

5. The detection method of the cab suspension hydraulic seal detection system according to claim 2 is characterized in that: The specific operation of step 3 is as follows: according to the oil pressure pressurization time and pressure set by the system, the tested kit is pressurized to the set pressure and then the pressure is maintained. The tested kit enters the pressure holding process. The pressure holding time of this process is T3s. The pressure holding indicator light on the touch screen lights up, or the pressure holding time can be set by the touch screen according to requirements. The pressure value detected by the pressure sensor (12) will be displayed on the touch screen in real time. If the pressure value fluctuates within the set range, it is considered that the test is qualified, and then the next step is carried out. If a pressure leak occurs, the system will quickly issue an alarm prompt and the system will stop testing at the same time. The specific operation of step 4 is as follows: after the tested set completes the pressure stabilization test, the middle position function is that the valve core of the three-position four-way solenoid valve (9) moves leftward after being energized, from the right position to the left position, the oil inlet P is connected with the working oil port B, the oil return port T is connected with the working oil port A, and the hydraulic oil flows from the oil inlet P to the working oil port B, and then the hydraulic oil flows into the control oil port of the hydraulic control check valve, so that the oil inlet and the oil return port of the hydraulic control check valve are connected, and the hydraulic oil in the tested set flows back to the oil inlet from the oil return port of the hydraulic control check valve. Since a small amount of gas in the oil pipeline is compressed after being pressurized by the oil pressure, when the pressure in the tested set is reduced to zero, the gas rebounds to make the hydraulic oil automatically return to the oil tank, and the pressure relief process of the set is realized. The pressure relief time of this process is T4s, or the pressure relief time can be set by the touch screen according to requirements. After the pressure relief process is completed, the pressure relief indicator on the touch screen lights up. After the detection task is completed, the motor stops, the tested set is disassembled, and then the sealing test of the next product is carried out.

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