A comprehensive test bench for hydraulic accessories

Abstract

The invention discloses a hydraulic accessory comprehensive test bench, comprising a test bench main body, on which a pressure source system, a static pressure test system, an electromagnetic valve actuator test system, a load relief valve test system, a front wheel turning control valve test system, a brake pressure reducing valve test system, a flow-resistance test system and a flap hydraulic motor test system are arranged; the pressure source system supplies pressure for the static pressure test system, the electromagnetic valve actuator test system, the load relief valve test system, the front wheel turning control valve test system, the brake pressure reducing valve test system, the flow-resistance test system and the flap hydraulic motor test system; the invention concentrates a plurality of test systems on a comprehensive test bench to meet the test requirements of various hydraulic systems of an aircraft, and can perform automatic testing, with the characteristics of high precision and strong versatility.

Description

Technical Field

[0001] The invention relates to the technical field of basket-related fields, in particular to a comprehensive test bench for hydraulic accessories. Background Art

[0002] An airplane (foreign name: aeroplane, airplane) is a heavier-than-air aircraft that flies in the atmosphere with a power unit that has one or more engines to generate forward thrust or pull, and fixed wings on the fuselage to generate lift.

[0003] The airplane is one of the most important inventions in the early 20th century, and it is generally recognized that it was invented by the American Wright brothers. According to its use, it can be divided into two categories: military aircraft and civilian aircraft. The invention of the airplane has profoundly changed and influenced people's lives, and has increasingly become an indispensable means of transportation in modern civilization. The airplane has a main pressure supply system, an emergency pressure supply system, a landing gear retraction system, a flap retraction system, a front wheel turning system, a landing gear wheel brake system, a windshield wiper system, an engine emergency stop and an air propeller emergency feathering system; in the process of daily use, China needs to check each system, and the existing detection of each system is mostly carried out by different equipment, and the reliability of the data obtained is not high, and it is also impossible to achieve high versatility. Summary of the invention

[0004] In order to solve the defects in the prior art that each system is mostly tested by different equipment, the obtained data is not reliable and cannot achieve high versatility, the present invention provides a hydraulic accessory comprehensive test bench.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The invention discloses a comprehensive test bench for hydraulic accessories, comprising a test bench main body, on which a pressure source system, a static pressure test system, a solenoid valve actuator test system, a unloading valve test system, a front wheel turning control valve test system, a brake pressure reducing valve test system, a flow-flow resistance test system and a flap hydraulic motor test system are arranged; the pressure source system supplies pressure for the static pressure test system, the solenoid valve actuator test system, the unloading valve test system, the front wheel turning control valve test system, the brake pressure reducing valve test system, the flow-flow resistance test system and the flap hydraulic motor test system.

[0007] As a preferred technical solution of the present invention, the pressure source system includes an oil tank and an oil supply pipeline connected to the oil tank, the oil supply pipeline is provided with an oil tank oil outlet ball valve, a motor constant pressure variable pump assembly, a hydraulic check valve, a first-level hydraulic oil filter, a first accumulator and a fourth pressure gauge in the order of the hydraulic oil passing through, and the oil supply pipeline is provided with a first pressure transmitter; a return oil pipe is provided between the oil supply pipeline and the oil tank, and the return oil pipe is provided with an electro-hydraulic proportional control valve and a first pressure gauge.

[0008] As a preferred technical solution of the present invention, the static pressure test system includes a test oil pipe connected to the oil return pipe, and the test oil pipe is provided with an oil drain ball valve, a hand pump, a hydraulic oil filter and an oil outlet joint in the order in which the hydraulic oil passes through. The ends of the test oil pipe are connected to a second pressure gauge and a third pressure gauge, and a first switch valve is provided between the second pressure gauge and the test oil pipe.

[0009] As a preferred technical solution of the present invention, the solenoid valve actuator testing system includes an oil delivery pipe connected to the oil supply pipeline, and also includes a first oil pipe and a second oil pipe, one end of the first oil pipe is connected to the oil delivery pipe, and one end of the second oil pipe is connected to the oil return pipe; an actuator is installed between the other end of the first oil pipe and the other end of the second oil pipe; the other end of the first oil pipe is connected to a fifth pressure gauge; the other end of the second oil pipe is also provided with a sixth pressure gauge, and a first three-position four-way solenoid valve is provided between the first oil pipe and the second oil pipe.

[0010] As a preferred technical solution of the present invention, the unloading valve test system includes a first valve test oil pipe connected to the return oil pipe and a second valve test oil pipe connected to the oil supply pipe, and the second valve test oil pipe is provided with a second switch valve; the end of the second valve test oil pipe is provided with a second accumulator, a seventh pressure gauge and a second pressure transmitter; and a connecting pipeline group is connected between the first valve test oil pipe and the second valve test oil pipe.

[0011] As a preferred technical solution of the present invention, the front wheel turning control valve test system includes a first front wheel turning oil pipe and a second front wheel turning oil pipe, and one end of the first front wheel turning oil pipe is connected to the oil supply pipe; one end of the second front wheel turning oil pipe is connected to the oil return pipe; the other end of the first front wheel turning oil pipe and the other end of the second front wheel turning oil pipe are both connected to the front wheel turning control valve; the front wheel turning control valve is connected to the front wheel turning actuator; the first front wheel turning oil pipe is provided with a third switch valve and a first two-position three-way hydraulic solenoid valve; the second front wheel turning oil pipe is provided with a first valve, a first two-position three-way electric ball valve and a first flow transmitter.

[0012] As a preferred technical solution of the present invention, the flap hydraulic motor test system includes connecting the first hydraulic oil pipe and the second hydraulic oil pipe, and the flap hydraulic motor is connected to the oil supply pipe and the oil return pipe through the first hydraulic oil pipe, the second hydraulic oil pipe; a second three-position four-way solenoid valve is installed between the first hydraulic oil pipe and the second hydraulic oil pipe; and a second two-position three-way hydraulic solenoid valve is also installed on the second hydraulic oil pipe.

[0013] As a preferred technical solution of the present invention, the brake pressure reducing valve testing system includes a normal pressure regulator, and the normal pressure regulator is connected to the oil supply pipe and the oil return pipe via a first pressure regulating pipeline and a second pressure regulating pipeline, and the first pressure regulating pipeline and the second pressure regulating pipeline are respectively provided with a seventh switch valve and a fourth switch valve; and the second pressure regulating pipeline is also provided with an eighth pressure gauge and a third pressure transmitter; the normal pressure regulator is connected to a ninth pressure gauge and a pressure accumulator bottle, and a fifth switch valve is provided between the pressure accumulator bottle and the normal pressure regulator.

[0014] As a preferred technical solution of the present invention, the flow-flow resistance testing system includes a flow-flow resistance accessory, the liquid inlet end of the flow-flow resistance accessory is connected to the oil delivery pipe via a test oil inlet pipe, and the oil outlet end of the flow-flow resistance accessory is connected to one end of a first two-position three-way hydraulic solenoid valve, the oil outlet end of the flow-flow resistance accessory is also connected to the return oil pipe via a test oil outlet pipe, and the test oil outlet pipe is provided with a tenth pressure gauge, a second valve, a first two-position three-way electric conversion ball valve, and a second flow transmitter.

[0015] As a preferred technical solution of the present invention, the flow-flow resistance test system also includes a hydraulic oil tank and an oil leakage test measuring cylinder, and the hydraulic oil tank is connected to one end of the oil leakage test measuring cylinder via a flow test oil inlet pipe, and a return oil filter and a second two-position three-way hydraulic solenoid valve are sequentially provided on the flow test oil inlet pipe; the hydraulic oil tank is connected to one end of the oil leakage test measuring cylinder via a flow test oil outlet pipe; the flow test oil inlet pipe and the flow test oil outlet pipe are connected via a connecting pipe, and a sixth switch valve is provided on the connecting pipe.

[0016] The beneficial effects of the present invention are:

[0017] This type of hydraulic accessory comprehensive test bench integrates the pressure source system, static pressure test system, solenoid valve actuator test system, unloading valve test system, nose wheel turning control valve test system, brake pressure reducing valve test system, flow-flow resistance test system and flap hydraulic motor test system on one comprehensive test bench to meet the testing needs of various hydraulic systems of the aircraft. It can also perform automatic testing and has the characteristics of high precision and strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of a pressure source system of a hydraulic accessory comprehensive test bench of the present invention;

[0020] Figure 2 It is a structural schematic diagram of a front wheel turning control valve test system of a hydraulic accessory comprehensive test bench of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a test bench main body of a hydraulic accessory comprehensive test bench of the present invention;

[0022] Figure 4 The present invention discloses a structure layout diagram of an operating panel of a test bench main body of a hydraulic accessory comprehensive test bench.

[0023] In the figure: 1. Test bench body;

[0024] 2. Pressure source system; 201. Oil tank; 202. Oil supply pipeline; 203. Oil tank outlet ball valve; 204. Motor constant pressure variable pump assembly; 205. Hydraulic check valve; 206. Primary hydraulic oil filter; 207. First accumulator; 208. Fourth pressure gauge; 209. First pressure transmitter; 210. Oil return pipe; 211. Electro-hydraulic proportional control valve; 212. First pressure gauge

[0025] Static pressure test system; 301, test oil pipe; 302, drain ball valve; 303, hand pump; 304, hydraulic oil filter; 305, oil outlet connector; 307, second pressure gauge; 308, third pressure gauge; 309, first switch valve;

[0026] 4. Solenoid valve actuator test system; 401. Oil delivery pipe; 402. First oil pipe; 403. Second oil pipe; 404. Actuator; 405. Fifth pressure gauge; 406. Sixth pressure gauge; 407. First three-position four-way solenoid valve;

[0027] 5. Unloading valve test system; 501. First valve test oil pipe; 502. Second valve test oil pipe; 503. Second switch valve; 504. Second accumulator; 505. Seventh pressure gauge; 506. Second pressure transmitter;

[0028] 6. Front wheel turning control valve test system; 601. First front wheel turning oil pipe; 602. Second front wheel turning oil pipe; 603. Front wheel turning control valve; 604. Front wheel turning actuator; 605. Third switch valve; 606. First two-position three-way hydraulic solenoid valve; 607. First valve; 608. First two-position three-way electric ball valve; 609. First flow transmitter;

[0029] 7. Brake pressure reducing valve test system; 701. First pressure regulating pipeline; 702. Second pressure regulating pipeline; 703. Seventh switch valve; 704. Fourth switch valve; 705. Eighth pressure gauge; 706. Third pressure transmitter; 707. Ninth pressure gauge; 708. Pressure accumulator bottle; 709. Fifth switch valve;

[0030] 8. Flow-resistance test system; 801. Flow-resistance accessories; 802. Test oil inlet pipe; 803. Test oil outlet pipe; 804. Tenth pressure gauge; 805. Second valve; 806. First two-position three-way electric conversion ball valve; 807. Second flow transmitter; 808. Hydraulic oil tank; 809. Oil leakage test cylinder; 810. Test oil inlet pipe; 811. Return oil filter; 812. Second two-position three-way hydraulic solenoid valve; 813. Flow test oil outlet pipe; 814. Connecting pipe; 815. Sixth switch valve;

[0031] 9. Flap hydraulic motor test system; 901. First hydraulic oil pipe; 902. Second hydraulic oil pipe; 903. Flap hydraulic motor; 904. Second three-position four-way solenoid valve; 905. Second two-position three-way hydraulic solenoid valve. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0033] Example: Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a comprehensive test bench for hydraulic accessories of the present invention comprises a test bench body 1, on which a pressure source system 2, a static pressure test system 3, a solenoid valve actuator test system 4, a unloading valve test system 5, a front wheel turning control valve test system 6, a brake pressure reducing valve test system 7, a flow-flow resistance test system 8 and a flap hydraulic motor test system 9 are arranged; the pressure source system 2 supplies pressure to the static pressure test system 3, the solenoid valve actuator test system 4, the unloading valve test system 5, the front wheel turning control valve test system 6, the brake pressure reducing valve test system 7, the flow-flow resistance test system 8 and the flap hydraulic motor test system 9. The present invention integrates the pressure source system 2, the static pressure test system 3, the solenoid valve actuator test system 4, the unloading valve test system 5, the front wheel turning control valve test system 6, the brake pressure reducing valve test system 7, the flow-flow resistance test system 8 and the flap hydraulic motor test system 9 on a comprehensive test bench to meet the test requirements of various hydraulic systems of an aircraft, and can perform automatic testing, with the characteristics of high precision and strong versatility.

[0034] The pressure source system 2 includes an oil tank 201 and an oil supply pipeline 202 connected to the oil tank 201. The oil supply pipeline 202 is provided with an oil tank outlet ball valve 203, a motor constant pressure variable pump assembly 204, a hydraulic one-way valve 205, a first hydraulic oil filter 206, a first accumulator 207 and a fourth pressure gauge 208 in the order of the hydraulic oil passing through. The oil supply pipeline 202 is provided with a first pressure transmitter 209; a return oil pipe 210 is provided between the oil supply pipeline 202 and the oil tank 201, and an electro-hydraulic proportional regulating valve 211 and a first pressure gauge 212 are provided on the return oil pipe 210. The pressure source system is used to supply liquid to each test system module, thereby effectively reducing the volume of the equipment.

[0035] The static pressure test system 3 includes a test oil pipe 301 connected to the oil return pipe 210, and the test oil pipe 301 is provided with an oil drain ball valve 302, a hand pump 303, a hydraulic oil filter 304 and an oil outlet joint 305 in the order of the hydraulic oil passing through, and the ends of the test oil pipe 301 are connected with a second pressure gauge 307 and a third pressure gauge 308, and a first switch valve 309 is provided between the second pressure gauge 307 and the test oil pipe 301. To meet the requirements of the static pressure test work, and it is independently set with other systems, and the work between them complements each other.

[0036] Among them, the solenoid valve actuator test system 4 includes an oil delivery pipe 401 connected to the oil supply pipeline 202, and also includes a first oil pipe 402 and a second oil pipe 403. One end of the first oil pipe 402 is connected to the oil delivery pipe 401, and one end of the second oil pipe 403 is connected to the return oil pipe 210; an actuator 404 is installed between the other end of the first oil pipe 402 and the other end of the second oil pipe 403; the other end of the first oil pipe 402 is connected to a fifth pressure gauge 405; the other end of the second oil pipe 403 is also provided with a sixth pressure gauge 406, and a first three-position four-way solenoid valve 407 is provided between the first oil pipe 402 and the second oil pipe 403; to meet the working requirements of the solenoid valve actuator, and it is independently set with other systems, and the working effects between each other are complementary.

[0037] Among them, the unloading valve test system 5 includes a first valve test oil pipe 501 connected to the return oil pipe 210 and a second valve test oil pipe 502 connected to the oil supply pipe 401, and the second valve test oil pipe 502 is provided with a second switch valve 503; the end of the second valve test oil pipe 502 is provided with a second accumulator 504, a seventh pressure gauge 505 and a second pressure transmitter 506; and a connecting pipeline group is connected between the first valve test oil pipe 501 and the second valve test oil pipe 502; to meet the testing work requirements of the unloading valve, and is independently set between other systems, and the work between them complements each other.

[0038] Among them, the front wheel turning control valve test system 6 includes a first front wheel turning oil pipe 601 and a second front wheel turning oil pipe 602, and one end of the first front wheel turning oil pipe 601 is connected to the oil supply pipe 401; one end of the second front wheel turning oil pipe 602 is connected to the return oil pipe 210; the other end of the first front wheel turning oil pipe 601 and the other end of the second front wheel turning oil pipe 602 are both connected to the front wheel turning control valve 603; the front wheel turning control valve 603 is connected to the front wheel turning actuator 604; the first front wheel turning oil pipe 601 is provided with a third switch valve 605 and a first two-position three-way hydraulic solenoid valve 606; the second front wheel turning oil pipe 602 is provided with a first valve 607, a first two-position three-way electric ball valve 608 and a first flow transmitter 609; to meet the testing work requirements of the front wheel turning control valve, and is independently set between other systems, and the work between them complements each other.

[0039] Among them, the flap hydraulic motor test system 9 includes a first hydraulic oil pipe 901 and a second hydraulic oil pipe 902 connected, and the flap hydraulic motor 903 is connected to the oil supply pipe 401 and the oil return pipe 210 through the first hydraulic oil pipe 901, the second hydraulic oil pipe 902; a second three-position four-way solenoid valve 904 is installed between the first hydraulic oil pipe 901 and the second hydraulic oil pipe 902; a second two-position three-way hydraulic solenoid valve 905 is also installed on the second hydraulic oil pipe 902.

[0040] The brake pressure reducing valve test system 7 includes a normal pressure regulator 710, and the normal pressure regulator 710 is connected to the oil supply pipe 401 and the oil return pipe 210 via the first pressure regulating pipeline 701 and the second pressure regulating pipeline 702, and the first pressure regulating pipeline 701 and the second pressure regulating pipeline 702 are respectively provided with a seventh switch valve 703 and a fourth switch valve 704; and the second pressure regulating pipeline 702 is also provided with an eighth pressure gauge 705 and a third pressure transmitter 706; the normal pressure regulator 710 is connected with a ninth pressure gauge 707 and a pressure storage bottle 708, and a fifth switch valve 709 is provided between the pressure storage bottle 708 and the normal pressure regulator 710; to meet the testing work requirements of the brake pressure reducing valve, and is independently set with other systems, and the work between them complements each other.

[0041] The flow-resistance test system 8 includes a flow-resistance accessory 801, the liquid inlet end of the flow-resistance accessory 801 is connected to the oil delivery pipe 401 via a test oil inlet pipe 802, and the oil outlet end of the flow-resistance accessory 801 is connected to one end of a first two-position three-way hydraulic solenoid valve 806, the oil outlet end of the flow-resistance accessory 801 is also connected to the return oil pipe 210 via a test oil outlet pipe 803, and the test oil outlet pipe 803 is provided with a tenth pressure gauge 804, a second valve 805, a first two-position three-way electric conversion ball valve 806, and a second flow transmitter 807; the flow -The flow resistance test system 8 also includes a hydraulic oil tank 808 and an oil leakage test measuring cylinder 809, and the hydraulic oil tank 808 is connected to one end of the oil leakage test measuring cylinder 809 via a flow test oil inlet pipe 810, and the flow test oil inlet pipe 810 is provided with a return oil filter 811 and a second two-position three-way hydraulic solenoid valve 812 in sequence; the hydraulic oil tank 808 is connected to one end of the oil leakage test measuring cylinder 809 via a flow test oil outlet pipe 813; the flow test oil inlet pipe 810 and the flow test oil outlet pipe 813 are connected via a connecting pipe 814, and a sixth switch valve 815 is provided on the connecting pipe 814.

[0042] The test bench can undertake the task of testing all performance indicators of hydraulic accessories of the Y-7 aircraft hydraulic system; the integrated hydraulic system has distributed regulation of pressure and flow, and its pressure regulation range should be able to meet the specific requirements of regular inspections of military aircraft, new product installation verification and fault detection; the automatic test system has reliable intelligent testing, a good operating interface and human-computer dialogue functions, and can be switched according to work requirements.

[0043] The main operating console consists of a box, a main operating panel, a test oil tank, an electrical control box and various interfaces.

[0044] (1) The front part of the main control panel consists of a large control panel, a special cover, a test oil pool and a front door from top to bottom. In the middle of the main control panel is a stainless steel cover, which can be used as a working platform at ordinary times. When the hydraulic accessories need to be tested for function, the cover can be removed and the connection and static pressure performance tests of each hydraulic accessory can be carried out in the test oil pool.

[0045] (2) Open the front door of the main console to see the accessories of the seven functional test circuits of the built-in integrated hydraulic system. In order to reduce the number of conduit connections, these accessories are directly installed on the valve block.

[0046] (3) A hand-cranked pump is fixed on the right side of the main console as the pump source for the static pressure test. There are two large open rear doors at the rear of the main console, which are convenient for disassembling and installing the ducts, accessories and checking the sealing of the system. In order to facilitate the movement of the test bench, four steerable wheels are installed at the bottom of the test bench. In addition, after the main console is placed in the working position, the support screws at the four corners of the bottom can be used to achieve a stable positioning of the test bench.

[0047] After reaching the working position, the support screws at the four corners of the bottom can be used to achieve stable positioning of the test bench.

[0048] (4) Pipeline: The pipes connected to the pressure gauge are all high-quality aviation copper pipes or stainless steel pipes.

[0049] The pipeline conduits of the fluid static pressure test system are divided into high and low pressure. The conduits with a pressure exceeding 4.9MPa (50kg / cm²) are high-pressure conduits, all of which are made of high-quality aviation stainless steel conduits. The conduits with a pressure below 4.9MPa (50kg / cm²) are low-pressure conduits, all of which are made of high-quality copper conduits. The pressure on the pipeline is 5MPa.

[0050] In addition, the conduits of the fluid dynamic test part are all stainless steel pipes, and their pressure resistance can withstand a pressure of 25MPa.

[0051] The main operating table oil pool is the oil return part. The main function and usage of the oil return pipeline part is to collect the oil leaked during the disassembly and assembly of accessories. The method is to open the oil drain ball valve of the oil collection pool, and the lubricating oil in the oil collection pool can flow into the oil collection tank.

[0052] Control Panel

[0053] The control panel of the main console is the control center of the test bench. Its layout is shown in Figure 3 , mainly divided into 4 independent parts: mechanical instrument indication part, electronic control system operation indication and information center touch screen, switch and voltage regulating handle part and connector part.

[0054] Mechanical Instruments

[0055] A total of 16 pressure gauges and 1 measuring cylinder flow meter are installed on the mechanical instrument indicator part on the upper part of the control panel.

[0056] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A comprehensive test bench for hydraulic accessories, characterized in that: The test bench comprises a test bench body (1), wherein the test bench body (1) is provided with a pressure source system (2), a static pressure test system (3), a solenoid valve actuator test system (4), a load relief valve test system (5), a front wheel turning control valve test system (6), a brake pressure reducing valve test system (7), a flow-flow resistance test system (8) and a flap hydraulic motor test system (9); the pressure source system (2) supplies pressure to the static pressure test system (3), the solenoid valve actuator test system (4), the load relief valve test system (5), the front wheel turning control valve test system (6), the brake pressure reducing valve test system (7), the flow-flow resistance test system (8) and the flap hydraulic motor test system (9); The pressure source system (2) comprises an oil tank (201) and an oil supply pipeline (202) connected to the oil tank (201); the oil supply pipeline (202) is provided with an oil tank oil outlet ball valve (203), a motor constant pressure variable pump assembly (204), a hydraulic check valve (205), a first hydraulic oil filter (206), a first accumulator (207) and a fourth pressure gauge (208) in the order in which the hydraulic oil passes through; the oil supply pipeline (202) is provided with a first pressure transmitter (209); an oil return pipe (210) is provided between the oil supply pipe (202) and the oil tank (201); the oil return pipe (210) is provided with an electro-hydraulic proportional control valve (211) and a first pressure gauge (212); The static pressure test system (3) comprises a test oil pipe (301) connected to the oil return pipe (210), and the test oil pipe (301) is provided with an oil drain ball valve (302), a hand pump (303), a hydraulic oil filter (304) and an oil outlet joint (305) in the order in which the hydraulic oil passes through, and the ends of the test oil pipe (301) are connected to a second pressure gauge (307) and a third pressure gauge (308), and a first switch valve (309) is provided between the second pressure gauge (307) and the test oil pipe (301); The solenoid valve actuator test system (4) comprises an oil delivery pipe (401) connected to the oil supply pipeline (202), and also comprises a first oil pipe (402) and a second oil pipe (403), one end of the first oil pipe (402) is connected to the oil delivery pipe (401), and one end of the second oil pipe (403) is connected to the oil return pipe (210); an actuator (404) is installed between the other end of the first oil pipe (402) and the other end of the second oil pipe (403); the other end of the first oil pipe (402) is connected to a fifth pressure gauge (405); the other end of the second oil pipe (403) is also provided with a sixth pressure gauge (406); a first three-position four-way solenoid valve (407) is provided between the first oil pipe (402) and the second oil pipe (403); The unloading valve test system (5) comprises a first valve test oil pipe (501) connected to the oil return pipe (210) and a second valve test oil pipe (502) connected to the oil supply pipe (401), wherein the second valve test oil pipe (502) is provided with a second switch valve (503); a second accumulator (504), a seventh pressure gauge (505) and a second pressure transmitter (506) are provided at the end of the second valve test oil pipe (502); and a connecting pipeline group is connected between the first valve test oil pipe (501) and the second valve test oil pipe (502).

2. A hydraulic accessory comprehensive test bench according to claim 1, characterized in that: The front wheel turning control valve test system (6) comprises a first front wheel turning oil pipe (601) and a second front wheel turning oil pipe (602), wherein one end of the first front wheel turning oil pipe (601) is connected to an oil supply pipe (401); one end of the second front wheel turning oil pipe (602) is connected to an oil return pipe (210); the other end of the first front wheel turning oil pipe (601) and the other end of the second front wheel turning oil pipe (602) are both connected to a front wheel turning control valve (603); the front wheel turning control valve (603) is connected to a front wheel turning actuator (604); the first front wheel turning oil pipe (601) is provided with a third switch valve (605) and a first two-position three-way hydraulic solenoid valve (606); the second front wheel turning oil pipe (602) is provided with a first valve (607), a first two-position three-way electric ball valve (608) and a first flow transmitter (609).

3. A hydraulic accessory comprehensive test bench according to claim 1, characterized in that: The flap hydraulic motor test system (9) comprises a first hydraulic oil pipe (901) and a second hydraulic oil pipe (902) connected, and the flap hydraulic motor (903) is connected to an oil supply pipe (401) and an oil return pipe (210) via the first hydraulic oil pipe (901), the second hydraulic oil pipe (902); a second three-position four-way solenoid valve (904) is installed between the first hydraulic oil pipe (901) and the second hydraulic oil pipe (902); and a second two-position three-way hydraulic solenoid valve (905) is also installed on the second hydraulic oil pipe (902).

4. A hydraulic accessory comprehensive test bench according to claim 1, characterized in that: The brake pressure reducing valve test system (7) comprises a normal pressure regulator (710), and the normal pressure regulator (710) is connected to the oil supply pipe (401) and the oil return pipe (210) via a first pressure regulating pipeline (701) and a second pressure regulating pipeline (702), and a seventh switch valve (703) and a fourth switch valve (704) are respectively provided on the first pressure regulating pipeline (701) and the second pressure regulating pipeline (702); and an eighth pressure gauge (705) and a third pressure transmitter (706) are also provided on the second pressure regulating pipeline (702); a ninth pressure gauge (707) and a pressure storage bottle (708) are connected to the normal pressure regulator (710), and a fifth switch valve (709) is provided between the pressure storage bottle (708) and the normal pressure regulator (710).

5. The hydraulic accessory comprehensive test bench according to claim 1, characterized in that: The flow-resistance test system (8) comprises a flow-resistance accessory (801), wherein the liquid inlet end of the flow-resistance accessory (801) is connected to the oil delivery pipe (401) via a test oil inlet pipe (802), and the oil outlet end of the flow-resistance accessory (801) is connected to one end of a first two-position three-way hydraulic solenoid valve (806), and the oil outlet end of the flow-resistance accessory (801) is also connected to the oil return pipe (210) via a test oil outlet pipe (803), and the test oil outlet pipe (803) is provided with a tenth pressure gauge (804), a second valve (805), a first two-position three-way electric conversion ball valve (806), and a second flow transmitter (807).

6. A hydraulic accessory comprehensive test bench according to claim 5, characterized in that: The flow-resistance test system (8) further comprises a hydraulic oil tank (808) and an oil leakage test measuring cylinder (809), wherein the hydraulic oil tank (808) is connected to one end of the oil leakage test measuring cylinder (809) via a flow test oil inlet pipe (810), and a return oil filter (811) and a second two-position three-way hydraulic solenoid valve (812) are sequentially provided on the flow test oil inlet pipe (810); the hydraulic oil tank (808) is connected to one end of the oil leakage test measuring cylinder (809) via a flow test oil outlet pipe (813); the flow test oil inlet pipe (810) and the flow test oil outlet pipe (813) are connected via a connecting pipe (814), and a sixth switch valve (815) is provided on the connecting pipe (814).

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