Hydraulic test system and test method based on delay brake control valve

Abstract

The invention discloses a hydraulic test system and method based on a delay brake control valve. The hydraulic test system comprises a power source assembly, a pressure adjusting assembly, a first test oil way, a second test oil way, the delay brake control valve, a brake assembly, a pressure collecting assembly and a pressure display part. The power source assembly comprises a motor, a plunger pump and an oil tank; wherein the motor is electrically connected with the plunger pump, the plunger pump is connected to the oil tank through a pipeline, and the output end of the plunger pump is connected to the first test oil way and the second test oil way respectively; the pressure adjusting assembly mainly comprises a main overflow valve used for adjusting the pressure of the test hydraulic system; an oil inlet of the main overflow valve is connected to an oil outlet path of the plunger pump, and an oil outlet of the main overflow valve is connected with the oil tank; acquisition and testing are carried out by simulating the delayed braking time of the delayed braking control valve of the hydraulic rotary motor under the actual working condition of the hydraulic rotary motor of the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and specifically to a hydraulic test system and a test method based on a delay braking control valve. Background Art

[0002] A hydraulic rotary motor converts hydraulic energy into mechanical energy and can achieve continuous rotary motion. To avoid abnormal operation of vehicles (such as excavators, loaders, rock drilling jumbo, etc.) caused by unreasonable delay time of the delay braking control valve used in the hydraulic rotary motor, it is necessary to conduct test measurements on the delay time of the delay braking control valve on the hydraulic rotary motor to determine that the delay braking time of the used hydraulic rotary motor meets the performance and working requirements of the vehicle;

[0003] The delay braking control valve plays a role in braking release and delay braking in the hydraulic rotary motor. When the hydraulic rotary motor stops rotating, the delay braking control valve can apply the braking action slowly. A suitable delay braking time can ensure that when the hydraulic rotary motor stops the rotary operation, the hydraulic rotary motor has enough time to brake smoothly, preventing hydraulic shock and mechanical vibration caused by too fast braking, and at the same time avoiding free rotation of the hydraulic rotary motor when rotation is not required due to too long delay time;

[0004] Existing measurement methods have problems such as complex structure and low accuracy, and it is not convenient to simulate the test acquisition of the delay braking time of the hydraulic rotary motor of the vehicle under actual working conditions.

[0005] The existing technology can no longer meet the needs of people at the present stage. Based on the current situation, it is urgent to improve the existing technology. Summary of the Invention

[0006] The purpose of the present invention is to provide a hydraulic test system based on a delay braking control valve to solve the problems raised in the above background art.

[0007] On the one hand, the present invention provides the following technical solution: A hydraulic test system based on a delay braking control valve is used to simulate the test acquisition of the delay braking time of the delay braking control valve of the hydraulic rotary motor of the vehicle under actual working conditions;

[0008] It includes: a power source assembly, a pressure regulating assembly, a first test oil circuit, a second test oil circuit, a delay braking control valve, a braking assembly, a pressure acquisition assembly, and a pressure display unit;

[0009] The power source assembly includes: a motor, a piston pump, and a fuel tank; wherein, the motor is electrically connected to the piston pump, and the piston pump is connected to the fuel tank through a pipeline, and the output end of the piston pump is respectively connected to the first test oil circuit and the second test oil circuit;

[0010] The pressure regulating assembly mainly includes a main relief valve for regulating the pressure of the test hydraulic system. The inlet of the main relief valve is connected to the outlet oil path of the plunger pump, and the outlet of the main relief valve is connected to the fuel tank.

[0011] The first test oil path includes: a first pressure reducing valve, a first two-position four-way electromagnetic directional control valve, and a first one-way throttle valve. Among them, the first pressure reducing valve is connected to the first two-position four-way electromagnetic directional control valve and the first one-way throttle valve in sequence through a pipeline.

[0012] The second test oil path includes: a second pressure reducing valve, a second two-position four-way electromagnetic directional control valve, and a second one-way throttle valve. Among them, the second pressure reducing valve is connected to the second two-position four-way electromagnetic directional control valve and the second one-way throttle valve in sequence through a pipeline.

[0013] The delay braking control valve includes: a two-position three-way valve and a pressure limiting cut-off valve. Among them, the output end of the pressure limiting cut-off valve is connected to the hydraulic rotary motor, the output end of the two-position three-way valve is connected to the braking control chamber, and a spring brake is also externally provided on the braking control chamber. The hydraulic rotary motor, the braking control chamber, and the spring brake together form a braking assembly.

[0014] The inlet of the delay braking control valve is also connected to a second pressure sensor through a three-way pressure measuring pipe joint. A pressure measuring port communicating with the braking control chamber is also provided on the hydraulic rotary motor, and a first pressure sensor is installed on the pressure measuring port. Both the first pressure sensor and the second pressure sensor are externally connected to a pressure data acquisition instrument.

[0015] The pressure display part includes: a first pressure gauge, a second pressure gauge, and a third pressure gauge. Among them, the first pressure gauge is arranged at the output end of the plunger pump for measuring the main system pressure; the second pressure gauge is arranged in the first test oil path for measuring the pressure of the first test oil path; the third pressure gauge is arranged in the second test oil path for measuring the pressure of the second test oil path.

[0016] On the other hand, the present invention also provides the following technical solution: a hydraulic test method based on a delay braking control valve, and the specific steps include:

[0017] Step S100, set the temperature of the hydraulic oil in the fuel tank of the test hydraulic system to be consistent with the temperature of the hydraulic oil in the vehicle fuel tank when the vehicle is working normally.

[0018] Step S200: The motor drives the plunger pump to suck oil from the fuel tank, so that the hydraulic oil passes through the first pressure reducing valve on the first test oil circuit, the P port and the B port of the first two-position four-way electromagnetic directional valve, and the first one-way throttle valve to reach the SH and PG ports of the delay brake control valve; another path of the hydraulic oil passes through the second pressure reducing valve on the second test oil circuit, the P port and the B port of the second two-position four-way electromagnetic directional valve, and the second one-way throttle valve to reach the SH and PG ports of the delay brake control valve.

[0019] Step S300: When the pressure at the SH port of the delay brake control valve ≥ 0.5 MPa, the two-way three-way valve in the delay brake control valve switches positions, so that the hydraulic oil enters the brake control chamber of the hydraulic swing motor through the oil outlet of the second test oil circuit and the delay brake control valve.

[0020] Step S301: When the pressure in the brake control chamber ≥ 1 Mpa, the mechanical brake of the swing motor spring brake starts to be released.

[0021] Step S302: When the pressure in the brake control chamber ≥ 1.5 MPa, the mechanical brake of the swing motor spring brake is completely released.

[0022] Step S400: Set the pressures of the first pressure reducing valve and the second pressure reducing valve in the first test oil circuit and the second test oil circuit to 3.5 MPa respectively. The motor drives the plunger pump to suck oil from the fuel tank. The hydraulic oil passes through the first test oil circuit and the second test oil circuit respectively and finally enters the brake control chamber of the hydraulic swing motor through the delay brake control valve to release the mechanical brake of the swing motor spring brake.

[0023] Step S500: By cutting off the power supply of the first two-position four-way electromagnetic directional valve on the first test oil circuit, the A port of the first two-position four-way electromagnetic directional valve on the first test oil circuit is connected to the fuel tank, and the P port is disconnected from the B port.

[0024] Step S600: When the pressure at the SH port of the delay brake control valve ≤ 0.5 MPa, the two-way three-way valve in the delay brake control valve switches positions to cut off the hydraulic oil entering the brake control chamber of the swing motor from the second test oil circuit; the hydraulic oil in the brake control chamber slowly returns to the inner cavity of the hydraulic swing motor through the two-way three-way valve and the pressure limiting cut-off valve of the delay brake control valve under the action of the spring brake, realizing the delay braking.

[0025] Step S700: Use a pressure data acquisition instrument to collect the pressures of the first pressure sensor and the second pressure sensor respectively, analyze the pressure changes in the braking control chamber of the hydraulic rotary motor and at the SH port, and test the data pressure curves during the time period when the pressure at the SH port ≤ 0.5 MPa and when the pressure in the braking chamber decreases from 3.5 MPa to ≤ 1 MPa. This is the delay braking time of the delay braking control valve. The time can be directly obtained from the test data pressure curve collected by the data acquisition instrument.

[0026] The present invention has the following beneficial effects:

[0027] The present invention simulates the delay braking time acquisition test of the delay braking control valve of the hydraulic rotary motor of a vehicle under actual working conditions through a power source component, a pressure regulating component, a first test oil circuit, a second test oil circuit, a delay braking control valve, and a braking component;

[0028] The present invention uses a pressure data acquisition instrument to collect the pressure changes in the braking chamber and the pressures in the braking control chamber and at the SH port of the hydraulic rotary motor, and judges the delay braking time by timing according to the pressure changes in the digital display pressure gauge. Finally, the delay braking time of the delay braking control valve can be directly deduced from the test data pressure curve. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the hydraulic test system of the present invention. Detailed Embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art in the technical field of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Reference Figure 1 On the one hand, the present invention provides the following technical solution: A hydraulic test system based on a delay braking control valve is used to simulate the delay braking time acquisition test of the delay braking control valve of a hydraulic rotary motor of a vehicle under actual working conditions, including: a power source component, a pressure regulating component, a first test oil circuit, a second test oil circuit, a delay braking control valve, a braking component, a pressure acquisition component, and a pressure display part;

[0032] The power source component includes: a resistance heater 11, a motor 12, a piston pump 13, an oil tank 14, and an air-cooled radiator 15; the motor 12 is electrically connected to the piston pump 13, and the piston pump 13 is connected to the oil tank 14 through a pipeline. The output end of the piston pump 13 is respectively connected to the first test oil circuit and the second test oil circuit;

[0033] The pressure regulating assembly mainly includes a main relief valve 20. The oil inlet of the main relief valve 20 is connected to the oil outlet pipeline of the plunger pump 13, and the oil outlet of the main relief valve 20 is connected to the oil tank 14, which is used to regulate the pressure of the entire test hydraulic system.

[0034] In this embodiment, since the hydraulic test system is a dynamic process, a hydraulic rotary motor is used to simulate the internal braking structure of the actual hydraulic rotary motor of the vehicle. During the entire test process, hydraulic oil will be continuously consumed. Then, the motor 12 drives the plunger pump 13 to extract hydraulic oil from the oil tank 14 to solve the power source problem of the test hydraulic system, ensuring that there is enough hydraulic oil for testing during the mechanical braking release process of the spring brake 63 of the rotary motor.

[0035] The first test oil circuit and the second test oil circuit are symmetric structures. The first test oil circuit includes: a first pressure reducing valve 31, a first two-position four-way electromagnetic directional control valve 32, and a first one-way throttle valve 33. Among them, the first pressure reducing valve 31 is connected to the first two-position four-way electromagnetic directional control valve 32 and the first one-way throttle valve 33 in sequence through pipelines. The second test oil circuit includes: a second pressure reducing valve 41, a second two-position four-way electromagnetic directional control valve 42, and a second one-way throttle valve 43. Among them, the second pressure reducing valve 41 is connected to the second two-position four-way electromagnetic directional control valve 42 and the second one-way throttle valve 43 in sequence through pipelines.

[0036] In this embodiment, the oil inlet of the first test oil circuit is connected to the oil outlet pipeline of the plunger pump 13, and the oil outlet of the first test oil circuit is connected to the oil inlet pipeline of the delay braking control valve. In this embodiment, the rated pressure of the system is adjusted to 20 MPa. During the actual operation of the vehicle hydraulic rotary motor, the pressures at the SH port (signal oil port) and the PG port (constant oil supply port) of the delay braking control valve are usually 3.5 MPa. Therefore, it is necessary to adjust the oil outlet pressure of the first test oil circuit to 3.5 MPa through the first pressure reducing valve 31 to meet the pressure in actual operation. The on-off of the hydraulic oil between the first test oil circuit and the SH port of the delay braking control valve is controlled by the two-position four-way electromagnetic directional control valve 32. When the first two-position four-way electromagnetic directional control valve 32 is energized, the P port (oil inlet) of the first two-position four-way electromagnetic directional control valve 32 is communicated with the B port (second oil outlet), so the oil outlet of the first test oil circuit is communicated with the hydraulic oil at the SH port of the delay braking control valve. When the first two-position four-way electromagnetic directional control valve 32 is de-energized, the A (first oil outlet) / B port of the first two-position four-way electromagnetic directional control valve 32 is communicated with the oil tank 14, so the hydraulic oil at the oil outlet of the first test oil circuit is disconnected from the SH port of the delay braking control valve. The first test oil circuit adjusts the hydraulic oil flow rate through the first one-way throttle valve 33.

[0037] In this embodiment, the oil inlet of the second test oil circuit is connected to the oil outlet circuit of the plunger pump 13, and the oil outlet of the second test oil circuit is connected to the PG port of the oil inlet circuit of the delay brake control valve. Since the rated pressure of the system is adjusted to 20 MPa, the pressures at the SH and PG ports of the delay brake control valve during the actual operation of the vehicle hydraulic swing motor are usually 3.5 MPa. Therefore, it is necessary to adjust the pressure at the oil outlet of the second test oil circuit to 3.5 MPa through the second pressure reducing valve 41 to meet the pressure requirements during actual operation. The connection and disconnection of the hydraulic oil between the second test oil circuit and the PG port of the delay brake control valve are controlled by the second two-position four-way electromagnetic reversing valve 42. When the second two-position four-way electromagnetic reversing valve 42 is energized, the P port and the B port of the second two-position four-way electromagnetic reversing valve 42 are connected, so that the hydraulic oil at the oil outlet of the first test oil circuit is connected to the PG port of the delay brake control valve. When the second two-position four-way electromagnetic reversing valve 42 is de-energized, the A / B port of the second two-position four-way electromagnetic reversing valve 42 is connected to the fuel tank 14, so that the hydraulic oil at the oil outlet of the first test oil circuit is disconnected from the PG port of the delay brake control valve. The hydraulic oil flow rate of the second test oil circuit is adjusted by the second one-way throttle valve 43.

[0038] The delay brake control valve includes: a two-way three-way valve 51 and a pressure limiting cut-off valve 52. Among them, the output end of the pressure limiting cut-off valve 52 is connected to the hydraulic swing motor 61, the output end of the two-way three-way valve 51 is connected to the brake control chamber 62, and a spring brake 63 is also provided outside the brake control chamber 62. The hydraulic swing motor 61, the brake control chamber 62, and the spring brake 63 together form a brake assembly.

[0039] The oil return port in the inner cavity of the hydraulic swing motor 61 is connected to the fuel tank 14 through a pipeline, so that the hydraulic oil during the test can be effectively recovered and continuously circulated throughout the test process, reducing the waste of hydraulic oil.

[0040] The oil inlet of the delay brake control valve is respectively connected to the oil outlet circuits of the first test oil circuit and the second test oil circuit, and the oil outlet of the delay brake control valve is connected to the brake control chamber of the hydraulic swing motor 61 for releasing the brake. The oil return port of the delay brake control valve is connected to the inner cavity of the hydraulic swing motor 61 for motor braking.

[0041] The oil inlet of the delay brake control valve is connected to the second pressure sensor 72 through a three-way pressure measuring pipe joint. A pressure measuring port connected to the brake control chamber 62 is also provided on the hydraulic swing motor, and a first pressure sensor 71 is installed on the pressure measuring port. Both the first pressure sensor 71 and the second pressure sensor 72 are externally connected to a pressure data acquisition instrument.

[0042] In this embodiment, the pressure data acquisition instrument can collect the pressure entering the SH port of the delay brake control valve and the pressure at the oil outlet of the first test oil circuit.

[0043] In this embodiment, the pressure data collector collects the pressure change in the brake cavity through the first pressure sensor 71, and the time of the delay brake control valve for delay braking can be directly deduced through the test data pressure curve; the delay brake control valve and the hydraulic rotary motor are connected by an internal hexagon screw, which is convenient for installation and disassembly, simple and convenient, and the delay braking time of the same type of delay brake control valve can be repeatedly tested.

[0044] In this embodiment, the pressure data collector collects and displays the pressures of the brake control cavity and the SH port of the hydraulic rotary motor; in other embodiments, the pressure data collector and the pressure sensor can also be changed to a digital display pressure gauge and a stopwatch, and the delay braking time can be judged by timing according to the pressure change in the digital display pressure gauge.

[0045] The oil return port in the inner cavity of the hydraulic rotary motor 61 is connected to the fuel tank 14 through a pipeline, and an electrically connected resistance heater 11 and an air-cooled radiator 15 are arranged in the fuel tank;

[0046] In this embodiment, when the vehicle is working normally, the temperature of the hydraulic oil in the vehicle fuel tank is generally about 60°C. In order to conveniently simulate the temperature of the hydraulic oil in the actual normal operation of the vehicle hydraulic rotary motor, the resistance heater 11 and the air-cooled radiator 15 arranged in the fuel tank 14 can avoid testing under low temperature or high temperature conditions.

[0047] A first pressure gauge 81, a second pressure gauge 82, and a third pressure gauge 83 are arranged in the pressure display part. Among them, the first pressure gauge 81 is arranged at the output end of the plunger pump 13 for measuring the main system pressure; the second pressure gauge is arranged in the first test oil circuit for measuring the pressure of the first test oil circuit; the third pressure gauge 83 is arranged in the second test oil circuit for measuring the pressure of the second test oil circuit.

[0048] On the other hand, the present invention also provides another technical solution, a hydraulic test method based on a delay brake control valve, and the specific steps include:

[0049] Step S100, setting the temperature of the hydraulic oil in the test hydraulic system fuel tank to be in line with the temperature of the hydraulic oil in the vehicle fuel tank when the vehicle is working normally;

[0050] Step S200, the motor drives the plunger pump to suck oil from the fuel tank, so that the hydraulic oil passes through the first pressure reducing valve on the first test oil circuit, the P port and the B port of the first two-position four-way electromagnetic reversing valve, and the first one-way throttle valve to reach the SH and PG ports of the delay brake control valve; the other way of the hydraulic oil passes through the second pressure reducing valve on the second test oil circuit, the P port and the B port of the second two-position four-way electromagnetic reversing valve, and the second one-way throttle valve to reach the SH and PG ports of the delay brake control valve;

[0051] Step S300, when the pressure at the SH port of the delay braking control valve ≥ 0.5 MPa, the two-way three-way valve in the delay braking control valve switches positions, enabling the hydraulic oil to enter the braking control chamber of the hydraulic swing motor through the oil outlet of the second test oil circuit via the delay braking control valve;

[0052] Step S301, when the pressure in the braking control chamber ≥ 1 Mpa, start to release the mechanical brake of the swing motor spring brake;

[0053] Step S302, when the pressure in the braking control chamber ≥ 1.5 MPa, completely release the mechanical brake of the swing motor spring brake;

[0054] Step S400, set the pressures of the first pressure reducing valve and the second pressure reducing valve in the first test oil circuit and the second test oil circuit to 3.5 MPa respectively. The motor drives the piston pump to suck oil from the fuel tank. The hydraulic oil enters the braking control chamber of the hydraulic swing motor through the first test oil circuit and the second test oil circuit and finally via the delay braking control valve, releasing the mechanical brake of the swing motor spring brake;

[0055] Step S500, by cutting off the power supply of the first two-way four-way electromagnetic directional control valve on the first test oil circuit, make the A port of the first two-way four-way electromagnetic directional control valve on the first test oil circuit communicate with the fuel tank, and the P port is disconnected from the B port;

[0056] Step S600, when the pressure at the SH port of the delay braking control valve ≤ 0.5 MPa, the two-way three-way valve in the delay braking control valve switches positions, cutting off the hydraulic oil entering the braking control chamber of the swing motor from the second test oil circuit; the hydraulic oil in the braking control chamber slowly returns to the inner cavity of the hydraulic swing motor through the two-way three-way valve and the pressure limiting cut-off valve of the delay braking control valve under the action of the spring brake, achieving delayed braking;

[0057] Step S700, collect the pressures of the first pressure sensor and the second pressure sensor respectively through the pressure data acquisition instrument, analyze the pressure changes in the braking control chamber of the hydraulic swing motor and at the SH port, and test the data pressure curve during the period when the pressure at the SH port ≤ 0.5 MPa and when the pressure in the braking chamber drops from 3.5 MPa to ≤ 1 MPa. This is the delay braking time of the delay braking control valve. Among them, the time can be directly obtained according to the test data pressure curve collected by the data acquisition instrument.

[0058] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydraulic test system based on a delay braking control valve, characterized in that, For collecting and testing the delay braking time of a delay braking control valve for a hydraulic swing motor of a vehicle to simulate the actual working conditions of the hydraulic swing motor; It includes: a power source assembly, a pressure regulating assembly, a first test oil circuit, a second test oil circuit, a delay braking control valve, a braking assembly, a pressure acquisition assembly, and a pressure display unit; The power source assembly includes: a motor (12), a piston pump (13), and a fuel tank (14); wherein, the motor (12) is electrically connected to the piston pump (13), and the piston pump (13) is connected to the fuel tank (14) through a pipeline, and the output end of the piston pump (13) is respectively connected to the first test oil circuit and the second test oil circuit; The pressure regulating assembly mainly includes a main relief valve (20) for regulating the pressure of the test hydraulic system; the inlet of the main relief valve (20) is connected to the outlet oil path of the piston pump (13), and the outlet of the main relief valve (20) is connected to the fuel tank (14); The first test oil circuit includes: a first pressure reducing valve (31), a first two-position four-way electromagnetic reversing valve (32), and a first one-way throttle valve (33); wherein, the first pressure reducing valve (31) is sequentially connected to the first two-position four-way electromagnetic reversing valve (32) and the first one-way throttle valve (33) through a pipeline; The second test oil circuit includes: a second pressure reducing valve (41), a second two-position four-way electromagnetic reversing valve (42), and a second one-way throttle valve (43), wherein the second pressure reducing valve (41) is sequentially connected to the second two-position four-way electromagnetic reversing valve (42) and the second one-way throttle valve (43) through a pipeline; The delay braking control valve includes: a two-position three-way valve (51) and a pressure limiting cut-off valve (52), wherein the output end of the pressure limiting cut-off valve (52) is connected to the hydraulic swing motor (61), the output end of the two-position three-way valve (51) is connected to the braking control chamber (62), and a spring brake (63) is further provided outside the braking control chamber (62), and the hydraulic swing motor (61), the braking control chamber (62), and the spring brake (63) together form a braking assembly; The inlet of the delay braking control valve is also connected to a second pressure sensor (72) through a three-way pressure measuring pipe joint, a pressure measuring port communicating with the braking control chamber (62) is further provided on the hydraulic swing motor, and a first pressure sensor (71) is installed on the pressure measuring port, and both the first pressure sensor (71) and the second pressure sensor (72) are externally connected to a pressure data acquisition instrument; The pressure display unit includes: a first pressure gauge (81), a second pressure gauge (82), and a third pressure gauge (83), wherein the first pressure gauge (81) is arranged at the output end of the piston pump (13) for measuring the main system pressure; the second pressure gauge is arranged in the first test oil circuit for measuring the pressure of the first test oil circuit; the third pressure gauge (83) is arranged in the second test oil circuit for measuring the pressure of the second test oil circuit.

2. The hydraulic test system based on a delay braking control valve according to claim 1, wherein: The power source assembly further includes: a resistance heater (11) and an air-cooled radiator (15); wherein, the resistance heater (11) and the air-cooled radiator (15) are arranged in the fuel tank (14) to simulate the temperature of the hydraulic oil when the vehicle hydraulic swing motor is working normally.

3. A hydraulic test system based on a delay braking control valve according to claim 1, wherein: The oil return port in the inner cavity of the hydraulic swing motor (61) is connected to the fuel tank (14) through a pipeline to recover the hydraulic oil during the test.

4. A hydraulic test system based on a delay braking control valve according to claim 1, characterized in that: The oil inlet of the time-delay braking control valve is respectively connected to the oil outlet of the first test oil circuit and the oil outlet of the second test oil circuit, and the oil outlet of the time-delay braking control valve is connected to the braking control cavity of the hydraulic swing motor (61) to release the brake; The oil return port of the time-delay braking control valve is connected to the inner cavity of the hydraulic swing motor (61) for braking the hydraulic swing motor (61).

5. A hydraulic test system based on a delay braking control valve according to claim 1, wherein: The first pressure reducing valve (31) adjusts the outlet pressure of the first test oil circuit to 3.5 MPa, and the second pressure reducing valve (41) adjusts the outlet pressure of the second test oil circuit to 3.5 MPa to meet the pressure of the time-delay braking control valve when the vehicle hydraulic swing motor is actually working.

6. The hydraulic test system based on a delay braking control valve according to claim 1, characterized in that: The first two-position four-way electromagnetic reversing valve (32) controls the connection and disconnection between the first test oil circuit and the time-delay braking control valve; wherein, When the first two-position four-way electromagnetic reversing valve (32) is energized, the oil inlet of the first two-position four-way electromagnetic reversing valve (32) is communicated with the second oil outlet, and the oil outlet of the first test oil circuit is connected to the time-delay braking control valve; When the first two-position four-way electromagnetic reversing valve (32) is de-energized, the first oil outlet or the second oil outlet of the first two-position four-way electromagnetic reversing valve (32) is communicated with the fuel tank (14), and the oil outlet of the first test oil circuit is disconnected from the time-delay braking control valve.

7. A hydraulic test system based on a delay braking control valve according to claim 1, characterized in that: The first test oil circuit adjusts the hydraulic oil flow rate of the first test oil circuit through a first one-way throttle valve (33).

8. A hydraulic test system based on a delay braking control valve according to claim 1, characterized in that: The pressure data acquisition instrument collects the pressure change in the braking cavity through the first pressure sensor (71), and infers the time of the time-delay braking of the time-delay braking control valve through the test data pressure curve.

9. A hydraulic testing method based on a delay braking control valve for the hydraulic testing system according to any one of claims 1-8, characterized in that, The specific steps include: Step S100, setting the temperature of the hydraulic oil in the test hydraulic system fuel tank to be consistent with the temperature of the hydraulic oil in the vehicle fuel tank when the vehicle is working normally; Step S200, the motor drives the piston pump to suck oil from the fuel tank, so that the hydraulic oil passes through the first pressure reducing valve, the first two-position four-way electromagnetic reversing valve, and the first one-way throttle valve on the first test oil circuit to reach the time-delay braking control valve; the other part of the hydraulic oil passes through the second pressure reducing valve, the second two-position four-way electromagnetic reversing valve, and the second one-way throttle valve on the second test oil circuit to reach the time-delay braking control valve; Step S300, when the pressure of the signal oil port of the time-delay braking control valve ≥ 0.5 MPa, the two-way three-way valve in the time-delay braking control valve switches positions, so that the hydraulic oil passes through the oil outlet of the second test oil circuit and enters the braking control cavity of the hydraulic swing motor through the time-delay braking control valve; Step S400: Set the pressures of the first pressure reducing valve and the second pressure reducing valve in the first test oil circuit and the second test oil circuit to 3.5 MPa respectively. The motor drives the piston pump to suck oil from the fuel tank. The hydraulic oil passes through the first test oil circuit and the second test oil circuit respectively and finally enters the brake control chamber of the hydraulic rotary motor through the delay brake control valve to release the mechanical brake of the rotary motor spring brake. Step S500: Cut off the power supply of the first two-position four-way electromagnetic directional valve on the first test oil circuit, so that the first oil outlet of the first two-position four-way electromagnetic directional valve on the first test oil circuit is connected to the fuel tank, and the oil inlet of the first two-position four-way electromagnetic directional valve is disconnected from the second oil outlet. Step S600: When the pressure at the signal oil port of the delay brake control valve ≤ 0.5 MPa, the two-way three-way valve in the delay brake control valve switches positions to cut off the hydraulic oil entering the brake control chamber of the rotary motor from the second test oil circuit; the hydraulic oil in the brake control chamber slowly returns to the inner cavity of the hydraulic rotary motor through the two-way three-way valve and the pressure limiting cut-off valve of the delay brake control valve under the action of the spring brake to achieve delayed braking. Step S700: Collect the pressures of the first pressure sensor and the second pressure sensor respectively through the pressure data acquisition instrument, analyze the pressure changes in the brake control chamber of the hydraulic rotary motor and at the signal oil port, test the data pressure curves during the period when the pressure at the signal oil port ≤ 0.5 MPa and when the pressure in the brake chamber drops from 3.5 MPa to ≤ 1 MPa, and infer the delay braking time of the delay brake control valve.

10. The hydraulic test method based on a delay braking control valve according to claim 9, wherein: Step S300 includes: Step S301: When the pressure in the brake control chamber ≥ 1 Mpa, start to release the mechanical brake of the rotary motor spring brake. Step S302: When the pressure in the brake control chamber ≥ 1.5 MPa, completely release the mechanical brake of the rotary motor spring brake.

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