Brake test bench with high-low pressure conversion

Abstract

The utility model discloses a brake testboard with high and low pressure conversion, which comprises a testboard main body, a cavity is arranged in the testboard main body, a hydraulic pump and a brake test module are arranged in the testboard main body, and the hydraulic pump is connected with the brake test module through a hydraulic pipeline. An operation panel is arranged on the front face of the test board body, and a high-low pressure control valve, a high-pressure stop valve, a low-pressure stop valve, a high-pressure pressure gauge, a low-pressure pressure gauge and a pressure switching protection device are installed on the hydraulic pipeline. The pressure switching protection device can cut off a hydraulic pipeline leading to the low-pressure pressure gauge and prevent the pressure gauge from being damaged due to overpressure.

Description

Technical Field

[0001] The utility model relates to the field of aviation ground service brake test bench test equipment, in particular to a brake test bench with high and low pressure conversion. Background Art

[0002] During the brake test, when the hydraulic pump pressure switches from low pressure to high pressure, first confirm whether the low-pressure shut-off valve is in the closed state. If the low-pressure shut-off valve is not completely closed or due to improper human operation, the pressure gauge may be damaged due to overpressure, which seriously affects the safety and progress of the operation. Utility Model Content

[0003] 1. Technical problems solved

[0004] In view of the shortcomings of the prior art, the utility model provides a brake test bench with high-low pressure conversion, wherein a hydraulic pump and a brake test module are arranged in the test bench body, and the hydraulic pump and the brake test module are connected by a hydraulic pipeline, and a low-pressure pressure gauge and a pressure switching protection device are installed on the hydraulic pipeline. When the hydraulic pump pressure switches from low pressure to high pressure, the pressure switching protection device can cut off the hydraulic pipeline leading to the low-pressure pressure gauge to prevent the pressure gauge from being damaged by overpressure, thereby solving the problems raised by the background technology.

[0005] 2. Technical solution

[0006] A brake test bench with high-low pressure conversion includes a test bench main body, a cavity is opened in the test bench main body, a hydraulic pump and a brake test module are arranged in the test bench main body, the hydraulic pump and the brake test module are connected by a hydraulic pipeline, an operation panel is arranged on the front of the test bench main body, and high-low pressure control valves, a high-pressure shut-off valve, a low-pressure shut-off valve, a high-pressure pressure gauge, a low-pressure pressure gauge and a pressure switching protection device are installed on the hydraulic pipeline.

[0007] Preferably, the hydraulic pipeline includes a main pipeline, a connecting branch one and a connecting branch two, and a high and low pressure control valve is installed on the main pipeline. One end of the main pipeline is connected to the hydraulic pump, and the other end of the main pipeline is connected to the brake test module. The main pipeline is respectively connected to the connecting branch one and the connecting branch two. A high-pressure shut-off valve is installed on the connecting branch one, and a low-pressure shut-off valve and a pressure switching protection device are installed on the connecting branch two. The pressure switching protection device is arranged between the low-pressure shut-off valve and the low-pressure pressure gauge.

[0008] Preferably, the pressure switching protection device includes a first shell and a second shell, the first shell and the second shell are of integral design, and two ends of the second shell are respectively provided with an oil inlet end and an oil outlet end, and the oil outlet end is connected to a pressure gauge, and is characterized in that: an oil channel is opened through the second shell, a slide groove is opened at one end of the first shell, a pilot oil channel is opened in the first shell, the pilot oil channel, the oil channel and the slide groove are connected to each other, a blocking member is slidably provided in the slide groove for closing the oil channel, one end of the blocking member is connected to an elastic member, and one end of the elastic member is connected to an adjusting member for adjusting the position of the blocking member.

[0009] Preferably, the adjusting member is an adjusting bolt which is threadedly connected in the slide groove, and one end of the adjusting bolt is in contact with one end of the elastic member.

[0010] Preferably, the blocking member comprises two pistons and a connecting rod, both ends of the connecting rod are fixedly connected to the pistons, and one of the pistons is fixedly connected to the elastic member.

[0011] Preferably, the elastic member is a spring.

[0012] Preferably, the width of the piston is greater than the width of the oil channel.

[0013] Preferably, the cross-sectional size of the connecting rod is smaller than the cross-sectional size of the oil channel.

[0014] Preferably, an assembly hole is provided at the other end of the first shell for assembling the blocking member, and a closing bolt is detachably provided in the assembly hole for closing the assembly hole.

[0015] Preferably, the high-pressure gauge and the low-pressure gauge are integrated on the operation panel, and the control buttons of the high-pressure and low-pressure control valves, the high-pressure shut-off valve and the low-pressure shut-off valve are also integrated on the operation panel.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. A hydraulic pump and a brake test module are arranged in the main body of the test bench. The hydraulic pump and the brake test module are connected by a hydraulic pipeline. A low-pressure pressure gauge and a pressure switching protection device are installed on the hydraulic pipeline. When the pressure of the hydraulic pump switches from low pressure to high pressure, the pressure switching protection device can cut off the hydraulic pipeline leading to the low-pressure pressure gauge to prevent the pressure gauge from being damaged by overpressure;

[0019] 2. The pressure switching protection device adjusts the pressure value by adjusting the bolt. When the oil enters the oil channel through the oil inlet end, it is partially diverted into the pilot oil channel through the oil channel. When the pressure of the passing oil reaches the pressure value set by the adjusting bolt, the oil will push the piston to move, and the piston will squeeze the spring until one piston closes the oil channel and cuts off the oil circuit, thereby playing a cut-off protection role. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0021] Figure 2 This is a partial hydraulic piping diagram of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the pressure switching protection device of the utility model;

[0023] Figure 4 This is a structural sectional view of the pressure switching protection device of the utility model.

[0024] In the figure: 1. first housing; 2. second housing; 3. oil channel; 4. oil inlet end; 5. oil outlet end; 6. slide groove; 7. pilot oil channel; 8. adjusting bolt; 9. piston; 10. connecting rod; 11. spring; 12. assembly hole; 20. hydraulic pump; 21. main pipeline; 22. connecting branch one; 23. connecting branch two; 24. high-pressure pressure gauge; 25. low-pressure pressure gauge; 26. brake test module; 2101. high and low pressure control valves; 2201. high-pressure stop valve; 2301. low-pressure stop valve; 100. test bench body; 200. pressure switching protection device; 300. operation panel. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example

[0027] Reference Figure 1-4 As shown,

[0028] A brake test bench with high-low pressure conversion includes a test bench body 100, wherein a cavity is opened in the test bench body 100, a hydraulic pump 20 and a brake test module 26 are arranged in the test bench body 100, the hydraulic pump 20 and the brake test module 26 are connected by a hydraulic pipeline, an operation panel 300 is arranged on the front of the test bench body 100, high-low pressure control valves 2101, high-pressure stop valves 2201, low-pressure stop valves 2301, high-pressure pressure gauges 24, low-pressure pressure gauges 25 and pressure switching protection devices 200 are installed on the hydraulic pipelines, the hydraulic pipelines include a main pipeline 21, a connecting branch 1 22 and a connecting branch 23, the main pipeline 21 is installed with high-low pressure control valves 2101, One end of the main pipeline 21 is connected to the hydraulic pump 20, and the other end of the main pipeline 21 is connected to the brake test module 26. The main pipeline 21 is connected to the connecting branch 1 22 and the connecting branch 2 23 respectively. The connecting branch 1 22 is equipped with a high-pressure shut-off valve 2201, and the connecting branch 2 23 is equipped with a low-pressure shut-off valve 2301 and a pressure switching protection device 200. The pressure switching protection device 200 is arranged between the low-pressure shut-off valve 2301 and the low-pressure pressure gauge 25. The high-pressure pressure gauge 24 and the low-pressure pressure gauge 25 are integrated on the operation panel 300. The control buttons of the high-pressure and low-pressure control valves 2101, the high-pressure shut-off valve 2201 and the low-pressure shut-off valve 2301 are also integrated on the operation panel 300.

[0029] A high and low pressure control valve 2101 is installed on the main pipeline 21, and the main pipeline 21 is connected to the connecting branch 1 22 and the connecting branch 2 23 respectively. The high and low pressure control valve 2101 is arranged between the hydraulic pump 20 and the connecting node between the main pipeline 21 and the connecting branch 1 22. The high and low pressure control valve 2101 is arranged between the hydraulic pump 20 and the connecting node between the main pipeline 21 and the connecting branch 2 23. A low pressure stop valve 2301 and a pressure switching protection device 200 are installed on the connecting branch 2 23. The pressure switching protection device 200 is arranged between the low pressure stop valve 2301 and the low pressure pressure gauge 25. The pressure switching protection device 200 can cut off the hydraulic pipeline leading to the low pressure pressure gauge 25 to prevent the pressure gauge from being damaged by overpressure.

[0030] The pressure switching protection device 200 comprises a first shell 1 and a second shell 2, wherein the first shell 1 and the second shell 2 are designed as an integral body, and the two ends of the second shell 2 are respectively provided with an oil inlet end 4 and an oil outlet end 5, and the oil outlet end 5 is connected to a pressure gauge, and is characterized in that: an oil passage 3 is provided through the second shell 2, a slide groove 6 is provided at one end of the first shell 1, a pilot oil passage 7 is provided in the first shell 1, and the pilot oil passage 7, the oil passage 3 and the slide groove 6 are connected in pairs, and a blocking member is slidably provided in the slide groove 6 for closing the oil passage 3, one end of the blocking member is connected to an elastic member, and one end of the elastic member is connected to an adjusting member for adjusting The blocking member is located at a position where the adjusting member is an adjusting bolt 8, which is threadedly connected to the slide groove 6. One end of the adjusting bolt 8 contacts one end of the elastic member. The blocking member includes two pistons 9 and a connecting rod 10. Both ends of the connecting rod 10 are fixedly connected to the pistons 9. One of the pistons 9 is fixedly connected to the elastic member. The elastic member is a spring 11. The width of the piston 9 is greater than the width of the oil channel 3. The cross-sectional size of the connecting rod 10 is smaller than the cross-sectional size of the oil channel 3. An assembly hole 12 is provided at the other end of the first housing 1 for assembling the blocking member. A closing bolt is detachably provided in the assembly hole 12 for closing the assembly hole 12.

[0031] The working principle of the pressure switching protection device is as follows: when in use, the pressure value is adjusted by adjusting the adjusting bolt 8. When the oil enters the oil channel 3 through the oil inlet end 4, it is partially diverted through the oil channel 3 and enters the pilot oil channel 7. When the pressure of the passing oil reaches the pressure value set by the adjusting bolt 8, the oil will push the piston 9 to move, and the piston 9 will squeeze the spring 11 until one piston 9 closes the oil channel 3 and cuts off the oil circuit, thereby playing a cut-off protection role. The device prevents the system pressure from exceeding the limited pressure through the self-closing function. Even if the stop valve is not closed or operated improperly, there will be no explosion phenomenon, which completely eliminates the adverse effects caused by the explosion and ensures normal operation safety and progress.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A brake test bench with high and low pressure conversion, comprising a test bench body (100), wherein a cavity is provided in the test bench body (100), characterized in that: A hydraulic pump (20) and a brake test module (26) are arranged in the test bench body (100); the hydraulic pump (20) and the brake test module (26) are connected via a hydraulic pipeline; an operation panel (300) is arranged on the front of the test bench body (100); and high- and low-pressure control valves (2101), a high-pressure stop valve (2201), a low-pressure stop valve (2301), a high-pressure pressure gauge (24), a low-pressure pressure gauge (25) and a pressure switching protection device (200) are installed on the hydraulic pipeline.

2. A brake test bench with high and low voltage conversion according to claim 1, characterized in that: The hydraulic pipeline comprises a main pipeline (21), a connecting branch line 1 (22) and a connecting branch line 2 (23); a high-low pressure control valve (2101) is installed on the main pipeline (21); one end of the main pipeline (21) is connected to a hydraulic pump (20); the other end of the main pipeline (21) is connected to a brake test module (26); the main pipeline (21) is communicated with the connecting branch line 1 (22) and the connecting branch line 2 (23) respectively; a high-pressure stop valve (2201) is installed on the connecting branch line 1 (22); a low-pressure stop valve (2301) and a pressure switching protection device (200) are installed on the connecting branch line 2 (23); the pressure switching protection device (200) is arranged between the low-pressure stop valve (2301) and the low-pressure pressure gauge (25).

3. A brake test bench with high and low voltage conversion according to claim 1, characterized in that: The pressure switching protection device (200) comprises a first shell (1) and a second shell (2), wherein the first shell (1) and the second shell (2) are of an integral design, and the second shell (2) is provided with an oil inlet end (4) and an oil outlet end (5) at both ends, respectively, and the oil outlet end (5) is connected to a pressure gauge, and is characterized in that: an oil passage (3) is provided through the second shell (2), a slide groove (6) is provided at one end of the first shell (1), a pilot oil passage (7) is provided in the first shell (1), the pilot oil passage (7), the oil passage (3) and the slide groove (6) are connected in pairs, a blocking member is slidably provided in the slide groove (6) for closing the oil passage (3), one end of the blocking member is connected to an elastic member, and one end of the elastic member is connected to an adjusting member for adjusting the position of the blocking member.

4. A brake test bench with high and low voltage conversion according to claim 3, characterized in that: The adjusting member is an adjusting bolt (8) which is threadedly connected in the slide groove (6); one end of the adjusting bolt (8) is in contact with one end of the elastic member.

5. A brake test bench with high and low voltage conversion according to claim 3, characterized in that: The blocking member comprises two pistons (9) and a connecting rod (10), both ends of the connecting rod (10) are fixedly connected to the pistons (9), and one of the pistons (9) is fixedly connected to the elastic member.

6. A brake test bench with high and low voltage conversion according to claim 3, characterized in that: The elastic member is a spring (11).

7. A brake test bench with high and low voltage conversion according to claim 5, characterized in that: The width of the piston (9) is greater than the width of the oil channel (3).

8. The brake test bench with high and low voltage conversion according to claim 5, characterized in that: The cross-sectional size of the connecting rod (10) is smaller than the cross-sectional size of the oil channel (3).

9. The brake test bench with high and low voltage conversion according to claim 3, characterized in that: The other end of the first shell (1) is provided with an assembly hole (12) for assembling a blocking member, and a detachable closing bolt is provided in the assembly hole (12) for closing the assembly hole (12).

10. The brake test bench with high and low voltage conversion according to claim 1, characterized in that: The high-pressure gauge (24) and the low-pressure gauge (25) are integrated on the operation panel (300), and the control buttons of the high-pressure and low-pressure control valves (2101), the high-pressure shut-off valve (2201) and the low-pressure shut-off valve (2301) are also integrated on the operation panel (300).

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