Air leakage detection equipment for brake valve of commercial vehicle

Abstract

The utility model provides air leakage detection equipment for a brake valve of a commercial vehicle. The air leakage detection equipment comprises a rack, a jacking mechanism, two air inlet pipes and two air outlet pipes, wherein the rack is horizontally provided with a workbench, the workbench is provided with a profiling clamp, and the profiling clamp is used for clamping and fixing a brake valve to be tested; the jacking mechanism is arranged on the workbench and is aligned with a brake top of the brake valve to be tested, and the jacking mechanism is used for jacking and pushing the brake top to enable the brake valve to be tested to be in a brake state; the two air inlet pipes are respectively connected with a front axle air inlet and a rear axle air inlet of the brake valve to be tested, are respectively used for being connected with an air source, and are respectively provided with a first air pressure sensor; the two air outlet pipes are respectively connected with a front axle air outlet and a rear axle air outlet of the brake valve to be tested, and the two air outlet pipes are jointly connected with a differential pressure gauge. The air leakage detection equipment for the brake valve of the commercial vehicle provided by the utility model can accurately detect the air leakage position and the air leakage amount of the brake valve.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicles, and in particular relates to a brake valve leakage detection device for commercial vehicles. Background Art

[0002] In recent years, as the functions of commercial vehicles have gradually diversified, the brake valve, as the core of the brake control system module, has become more complex in structure. Detecting whether the brake system, especially the brake valve, is leaking is very important for the safe driving of the vehicle.

[0003] At present, the method for detecting brake valve leakage is overall detection. Although it can determine whether the brake valve is leaking, the brake valve structure currently used in commercial vehicles is very complex and there are many reasons for leakage. Therefore, this method cannot accurately determine whether the leakage is caused by the air holes in the valve body or the piston or seal in the valve. Not only is the location unclear, but the amount of leakage is also uncertain. Therefore, the current method for detecting brake valve leakage is not detailed enough. For brake valves with leakage faults after overall detection, they are often replaced without repair, which results in high maintenance costs for the brake system of commercial vehicles. Utility Model Content

[0004] The embodiment of the utility model provides a commercial vehicle brake valve leakage detection device, which aims to achieve accurate detection of the leakage position and leakage amount of the brake valve, thereby reducing the maintenance cost of the commercial vehicle brake system.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a commercial vehicle brake valve leakage detection device, including a frame, a pressing mechanism, two air inlet pipes, and two air outlet pipes; wherein, a workbench is horizontally arranged on the frame, and a profiling fixture is provided on the workbench, and the profiling fixture is used to clamp and fix the brake valve to be tested; the pressing mechanism is arranged on the workbench and aligned with the brake head of the brake valve to be tested, and the pressing mechanism is used to push the brake head to make the brake valve to be tested form a braking state; the two air inlet pipes are respectively connected to the front axle air inlet and the rear axle air inlet of the brake valve to be tested, and are respectively used to connect to the air source, and the two air inlet pipes are both provided with a first air pressure sensor; the two air outlet pipes are respectively connected to the front axle air outlet and the rear axle air outlet of the brake valve to be tested, and the two air outlet pipes are commonly connected to a differential pressure gauge.

[0006] In one possible implementation, the profiling fixture includes a support, a bracket, a pressure plate, and a first driving member; wherein the support is arranged on the workbench, the support is provided with a through hole, the through hole is suitable for the output end of the pressing mechanism to pass through, the support is used to support the brake valve to be tested and align the brake head with the through hole; the bracket is arranged on the workbench and straddles above the support; the pressure plate is connected to the bracket for sliding up and down, and the lower plate surface of the pressure plate is provided with a profiling pressure head; the first driving member is arranged on the bracket, the output end is connected to the pressure plate, and is used to drive the pressure plate to move downward so that the profiling pressure head presses the brake valve to be tested.

[0007] In some embodiments, the contoured fixture further includes a first pushing member and a second pushing member; wherein the first pushing member is horizontally arranged on the workbench and is located on one side of the support; the second pushing member is horizontally arranged on the workbench and is located on the other side of the support, and the output end of the second pushing member cooperates with the output end of the second pushing member to clamp the brake valve to be tested.

[0008] Exemplarily, an air circuit valve block is provided at the output end of the first push member, and the air circuit valve block has two air inlet connectors and two air outlet connectors; wherein the two air inlet connectors are respectively connected to the two air inlet pipes, and the two air inlet connectors are respectively sealed and abutted against the front axle air inlet and the rear axle air inlet; the two air outlet connectors are respectively connected to the two air outlet pipes, and the two air outlet connectors are respectively sealed and abutted against the front axle air outlet and the rear axle air outlet.

[0009] For example, a limit clamping seat is provided at the output end of the second push member, and the limit clamping seat is clamped with the peripheral wall of the brake valve to be tested.

[0010] In a possible implementation, two slide rails are spaced apart on the workbench, at least one slider is slidably connected to each of the two slide rails, and a support is connected to each slider; a second driving member is also provided on the workbench, and an output end of the second driving member is connected to the support for driving the support to move along the slide rails.

[0011] In some embodiments, a laser sensor and a proximity switch are provided on the workbench; wherein the sensing end of the laser sensor faces the position between the support and the contouring pressure head, and the proximity switch is aligned with the side wall of the support facing one end of the slide rail.

[0012] Exemplarily, the first driving member includes two guide rods and a telescopic driving member; wherein the two guide rods are distributed in parallel and spaced apart and are respectively slid through the bracket in the vertical direction, and the lower ends of the two guide rods are respectively connected to the two ends of the pressure plate; the telescopic driving member is vertically arranged on the bracket and is located between the two guide rods, and the output end of the telescopic driving member is downward and connected to the pressure plate.

[0013] For example, the pressing mechanism includes a fixed seat, a sliding seat, a screw, and a rotating drive member; the fixed seat is fixedly connected to the bottom surface of the workbench; the sliding seat is slidably connected to the fixed seat along the vertical direction, and the sliding seat is provided with a push rod matching the brake head, and the push rod is aligned with the through hole up and down; the screw is vertically penetrated on the sliding seat and is spirally matched with the sliding seat; the rotating drive member is arranged on the fixed seat, and the output end is connected to the bottom end of the screw.

[0014] In some embodiments, both air inlet pipes are provided with a normally open solenoid valve, which is located between the first air pressure sensor and the air source; and both air outlet pipes are provided with a second air pressure sensor.

[0015] The beneficial effect of the commercial vehicle brake valve leakage detection device provided by the utility model is that compared with the prior art, the commercial vehicle brake valve leakage detection device provided by the utility model, the brake valve to be tested is placed on a workbench and clamped and fixed by a contoured clamp, and then two intake pipes are respectively connected to the front axle air inlet and the rear axle air inlet of the brake valve to be tested, and two outlet pipes are respectively connected to the front axle air outlet and the rear axle air outlet of the brake valve to be tested, and after the connection is completed, leakage detection can be carried out.

[0016] During the detection, the air source inflates the two intake pipes and maintains the pressure, and then the first air pressure sensor is used to detect whether there is a pressure drop in the two intake pipes during the pressure maintenance period. If a pressure drop occurs, it is determined that there is a leakage fault in the front axle air intake and / or the rear axle air intake. If both of the two first air pressure sensors detect no pressure drop, the top pressure mechanism is turned on to output a top pressure to the brake top head of the brake valve to be tested so that the brake valve to be tested forms a braking state. At this time, the gas in the two intake pipes passes through the brake valve to be tested and enters the two outlet pipes respectively. After maintaining the pressure for a period of time, it is determined by a differential pressure gauge whether there is a pressure difference between the two outlet pipes. If there is no pressure difference, it indicates that there is no leakage in the brake valve to be tested. If a pressure difference occurs, it is determined that there is a leakage fault in the front axle outlet or the rear axle outlet connected to the low-pressure side of the differential pressure gauge through the outlet pipe.

[0017] The leakage detection process described above can clearly determine the leakage position of the brake valve to be tested, and the leakage amount can be accurately determined by the pressure drop of the first air pressure sensor and the pressure difference of the differential pressure gauge, thereby facilitating precise repair of the fault position of the brake valve to be tested, which is beneficial to reducing the maintenance cost of the commercial vehicle brake system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the main structure of a commercial vehicle brake valve leakage detection device provided by an embodiment of the utility model;

[0019] Figure 2 A gas circuit block diagram of a commercial vehicle brake valve leakage detection device provided by an embodiment of the utility model;

[0020] Figure 3A schematic diagram of the three-dimensional structure of a commercial vehicle brake valve leakage detection device (excluding the frame) provided in an embodiment of the utility model Figure 1 ;

[0021] Figure 4 A schematic diagram of the three-dimensional structure of a commercial vehicle brake valve leakage detection device (excluding the frame) provided in an embodiment of the utility model Figure 2 ;

[0022] Figure 5 A schematic diagram of the three-dimensional structure of the gas circuit valve block used in the embodiment of the utility model;

[0023] Figure 6 A schematic diagram of the three-dimensional structure of a brake valve to be tested applicable to the commercial vehicle brake valve leakage detection device provided by the embodiment of the utility model;

[0024] Figure 7 A control block diagram of a commercial vehicle brake valve leakage detection device provided in an embodiment of the utility model.

[0025] In the figure: 10, frame; 100, workbench; 101, slide rail; 102, slider; 103, laser sensor; 104, proximity switch; 20, profiling fixture; 21, support; 22, bracket; 23, pressing plate; 231, profiling pressure head; 24, first driving member; 241, guide rod; 242, telescopic driving member; 25, first push member; 251, gas circuit valve block; 2511, air inlet connector; 2512, Air outlet connector; 26, second push member; 261, limit clamp; 30, brake valve to be tested; 300, brake push head; 301, front axle air inlet; 302, rear axle air inlet; 303, front axle air outlet; 304, rear axle air outlet; 40, push mechanism; 41, fixed seat; 42, sliding seat; 421, push rod; 43, lead screw; 44, rotary drive member; 50, air inlet pipe; 60, air outlet pipe; 70, control box. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on another element or indirectly on another element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0028] Please also read Figures 1 to 7 Now, the commercial vehicle brake valve leakage detection equipment provided by the utility model is described. The commercial vehicle brake valve leakage detection equipment comprises a frame 10, a pressing mechanism 40, two air inlet pipes 50, and two air outlet pipes 60; wherein a workbench 100 is horizontally arranged on the frame 10, and a profiling fixture 20 is arranged on the workbench 100, and the profiling fixture 20 is used to clamp and fix the brake valve 30 to be tested; the pressing mechanism 40 is arranged on the workbench 100 and is aligned with the brake head 300 of the brake valve 30 to be tested, and the pressing mechanism 40 is used to push the brake head 300 to make the brake valve 30 to be tested form a braking state; the two air inlet pipes 50 are respectively connected to the front axle air inlet 301 and the rear axle air inlet 302 of the brake valve 30 to be tested, and are respectively used to connect to the air source, and the two air inlet pipes 50 are both provided with a first air pressure sensor; the two air outlet pipes 60 are respectively connected to the front axle air outlet 303 and the rear axle air outlet 304 of the brake valve 30 to be tested, and the two air outlet pipes 60 are commonly connected to a differential pressure gauge.

[0029] It should be noted that the braking method of a commercial vehicle includes front axle braking and rear axle braking, so its brake valve includes two air circuits, one of which is connected to the front axle air inlet 301 by an air source through an air intake pipe 50, and is connected to the front axle braking mechanism through an air outlet pipe 60 connected to the front axle air outlet 303, and the other is connected to the rear axle braking mechanism by an air source through an air intake pipe 50 and a rear axle air inlet 302, and is connected to the rear axle braking mechanism through an air outlet pipe 60 connected to the rear axle air outlet 304.

[0030] It should be explained that the actions of the pressing mechanism 40 and the contoured fixture 20 in the commercial vehicle brake valve leakage detection device provided in this embodiment can be realized automatically based on the controller and the corresponding electric control components, or can be completed by manual operation. Figure 7In the automatic control method shown, a control box 70 is set on the frame 10, a controller is set in the control box 70, and control buttons and a display screen are set on the side walls of the control box 70. The control buttons are used to control the actions of the profiling fixture 20 and the top pressing mechanism 40, and the display screen is used to display the detection values ​​of the first air pressure sensor and the differential pressure gauge.

[0031] Compared with the prior art, the commercial vehicle brake valve leakage detection equipment provided in this embodiment is that the brake valve 30 to be tested is placed on a workbench 100 and clamped and fixed by a contoured fixture 20, and then the two air inlet pipes 50 are respectively connected to the front axle air inlet 301 and the rear axle air inlet 302 of the brake valve 30 to be tested, and the two air outlet pipes 60 are respectively connected to the front axle air outlet 303 and the rear axle air outlet 304 of the brake valve 30 to be tested. After the connection is completed, the leakage detection can be carried out.

[0032] During the detection, the air source inflates the two air inlet pipes 50 and maintains the pressure. Then, the first air pressure sensor is used to detect whether there is a pressure drop in the two air inlet pipes 50 during the pressure maintenance period. If a pressure drop occurs, it is determined that there is a leakage fault in the front axle air inlet 301 and / or the rear axle air inlet 302. If both of the two first air pressure sensors detect no pressure drop, the top pressure mechanism 40 is opened to output a top pressure to the brake head 300 of the brake valve 30 to be tested so that the brake valve 30 to be tested forms a braking state. At this time, the gas in the two air inlet pipes 50 passes through the brake valve 30 to be tested and enters the two air outlet pipes 60 respectively. Then, after maintaining the pressure for a period of time, it is determined by a differential pressure gauge whether there is a pressure difference between the two air outlet pipes 60. If there is no pressure difference, it means that there is no leakage in the brake valve 30 to be tested. If a pressure difference occurs, it is determined that there is a leakage fault in the front axle air outlet 303 or the rear axle air outlet 304 connected to the low-pressure side of the differential pressure gauge through the air outlet pipe 60.

[0033] The leakage detection process described above can clearly determine the leakage position of the brake valve 30 to be tested, and the leakage amount can be accurately determined by the pressure drop of the first air pressure sensor and the pressure difference of the differential pressure gauge, thereby facilitating precise repair of the fault position of the brake valve 30 to be tested, which is beneficial to reducing the maintenance cost of the commercial vehicle brake system.

[0034] In some embodiments, see Figures 1 to 4The profiling fixture 20 includes a support 21, a bracket 22, a pressure plate 23, and a first driving member 24; wherein the support 21 is arranged on the workbench 100, and a through hole is provided on the support 21, and the through hole is suitable for the output end of the pressing mechanism 40 to pass through, and the support 21 is used to support the brake valve 30 to be tested and align the brake head 300 with the through hole; the bracket 22 is arranged on the workbench 100 and straddles above the support 21; the pressure plate 23 is connected to the bracket 22 in an up-and-down sliding manner, and a profiling pressure head 231 is provided on the lower plate surface of the pressure plate 23; the first driving member 24 is arranged on the bracket 22, and the output end is connected to the pressure plate 23, and is used to drive the pressure plate 23 to move downward so that the profiling pressure head 231 presses the brake valve 30 to be tested.

[0035] The support 21 supports the brake valve 30 to be tested and uses the through hole to keep the brake head 300 out of the air, and then the first driving member 24 is used to drive the pressure plate 23 to be pressed down, so that the contoured pressure head 231 presses the brake valve 30 to be tested downward, thereby ensuring the stability of the brake valve 30 to be tested when the output end of the pressing mechanism 40 applies a pressing pressure to the brake head 300 through the through hole.

[0036] As a modified embodiment of the above-mentioned profiling fixture 20, please refer to Figure 1 The profiling fixture 20 further includes a first push piece 25 and a second push piece 26; wherein the first push piece 25 is horizontally arranged on the workbench 100 and located on one side of the support 21; the second push piece 26 is horizontally arranged on the workbench 100 and located on the other side of the support 21, and the output end of the second push piece 26 cooperates with the output end of the second push piece 26 to clamp the brake valve 30 to be tested. Here, both the first push piece 25 and the second push piece 26 can be cylinders or electric push rods. On the basis of the pressure plate 23 and the support 21 cooperating to clamp the brake valve 30 to be tested up and down, the first push piece 25 and the second push piece 26 are arranged to cooperate to clamp the brake valve 30 to be tested horizontally, thereby further improving the fixing stability of the brake valve 30 to be tested on the workbench 100.

[0037] For some possible implementations, see Figures 3 to 5 The output end of the first push member 25 is provided with an air circuit valve block 251, and the air circuit valve block 251 has two air inlet connectors 2511 and two air outlet connectors 2512; wherein, the two air inlet connectors 2511 are respectively connected to the two air inlet pipes 50, and the two air inlet connectors 2511 are respectively sealed and abutted with the front axle air inlet 301 and the rear axle air inlet 302; the two air outlet connectors 2512 are respectively connected to the two air outlet pipes 60, and the two air outlet connectors 2512 are respectively sealed and abutted with the front axle air outlet 303 and the rear axle air outlet 304.

[0038] Here, the air circuit valve block 251 is used to achieve docking with each air port on the brake valve 30 to be tested. Specifically, the output end of the first push member 25 is used to drive the air circuit valve block 251 to move toward the brake valve 30 to be tested, so that the two air inlet joints 2511 are respectively sealed against the front axle air inlet 301 and the rear axle air inlet 302 on the side wall of the brake valve 30 to be tested, and the two air outlet joints 2512 are respectively sealed against the front axle air outlet 303 and the rear axle air outlet 304, and at the same time, the second push member 26 cooperates with the abutment effect on the brake valve 30 to be tested, which can ensure that the abutment pressure between the air circuit valve block 251 and the brake valve 30 to be tested is sufficient, thereby ensuring the connection tightness between the air inlet joint 2511 and the air outlet joint 2512 and each valve port of the brake valve 30 to be tested. By arranging the air circuit valve block 251 at the output end of the first push member 25, it is convenient for the brake valve 30 to be tested to quickly connect the air inlet pipe 50 and the air outlet pipe 60, thereby improving the test efficiency.

[0039] It should be noted that if Figure 3 As shown, a limit clamping seat 261 is provided at the output end of the second push member 26, and the limit clamping seat 261 is clamped with the peripheral wall of the brake valve 30 to be tested. The limit clamping seat 261 can specifically be a structure with a V-shaped clamping groove, and the brake valve 30 to be tested is clamped by the limit clamping seat 261 and the clamping force formed between the first push member 25 and the second push member 26 to reliably fix the brake valve 30 to be tested, thereby ensuring the air circuit connection sealing between the air circuit valve block 251 and the brake valve 30 to be tested, and avoiding leakage at the connection position due to the movement of the brake valve 30 to be tested, which affects the detection accuracy.

[0040] In some embodiments, such as Figure 3 As shown, two slide rails 101 are arranged at intervals on the workbench 100, and at least one slider 102 is slidably connected to each of the two slide rails 101, and the support 21 is connected together with each slider 102; a second driving member (not shown in the figure) is also provided on the workbench 100, and the output end of the second driving member is connected to the support 21, and is used to drive the support 21 to move along the slide rail 101. The second driving member can be a telescopic cylinder or an electric push rod. When installing the brake valve 30 to be tested, the second driving member first drives the support 21 to move along the slide rail 101 to the side and lower side of the pressure plate 23, so that sufficient space is obtained above the support 21 to facilitate the placement operation of the brake valve 30 to be tested. After the brake valve 30 to be tested is placed in place on the support 21, the second driving member drives the support 21 to move in the opposite direction to the right below the pressure plate 23, and then the first driving member 24 drives the pressure plate 23 to move downward to press the brake valve 30 to be tested. The action logic is clear and automatic control is easy to achieve.

[0041] On the basis of the above, see Figure 3, a laser sensor 103 and a proximity switch 104 are provided on the workbench 100; wherein, the sensing end of the laser sensor 103 faces the position between the support 21 and the contoured pressure head 231, and the proximity switch 104 is aligned with the side wall of the support 21 facing the end of the slide rail 101. It should be understood that the laser sensor 103 and the proximity switch 104 are electrically connected to the controller respectively, and the laser sensor 103 can sense whether the brake valve 30 to be tested is placed on the support 21. Specifically, when the brake valve 30 to be tested is placed on the support 21, it blocks the laser emitted by the laser sensor 103, thereby enabling the laser sensor 103 to obtain a sensing signal and feed it back to the controller. After obtaining the sensing signal, the controller controls the second driving member to drive the support 21 to move. When the support 21 moves to abut against the proximity switch 104, the second driving member drives the support 21 to move. When connected, the profiling pressure head 231 is aligned with the brake valve to be tested 30 in the vertical direction. At this time, the controller controls the first driving member 24 to drive the pressure plate 23 to move downward, so that the profiling pressure head 231 presses the brake valve to be tested 30, and then the controller controls the first pushing member 25 and the second pushing member 26 to move synchronously to horizontally clamp the brake valve to be tested 30. At the same time, each air port of the air circuit valve block 251 forms a sealing connection with each valve port position of the brake valve to be tested 30, thereby automating the clamping process and the air circuit connection process of the brake valve to be tested 30.

[0042] Specifically, Figure 3 As shown, in this embodiment, the first driving member 24 includes two guide rods 241 and a telescopic driving member 242; wherein, the two guide rods 241 are distributed in parallel and spaced apart and are respectively slidably arranged in the vertical direction through the bracket 22, and the lower ends of the two guide rods 241 are respectively connected to the two ends of the pressure plate 23; the telescopic driving member 242 is vertically arranged on the bracket 22 and is located between the two guide rods 241, and the output end of the telescopic driving member 242 is downward and connected to the pressure plate 23.

[0043] The first driving member 24 can specifically be a telescopic cylinder or an electric push rod. The connection with the pressure plate 23 using two guide rods 241 can ensure that the pressure plate 23 moves linearly in the vertical direction under the drive of the first driving member 24, thereby improving the movement accuracy of the contoured pressure head 231 set on the pressure plate 23, thereby improving the fixed position accuracy and stability of the brake valve 30 to be tested.

[0044] Optionally, the structure of the pressing mechanism 40 in this embodiment is as follows: Figure 3As shown, the pressing mechanism 40 includes a fixed seat 41, a slide seat 42, a lead screw 43, and a rotary drive member 44; the fixed seat 41 is fixedly connected to the bottom surface of the workbench 100; the slide seat 42 is slidably connected to the fixed seat 41 along the vertical direction, and the slide seat 42 is provided with a push rod 421 matching the brake head 300, and the push rod 421 is aligned with the through hole up and down; the lead screw 43 is vertically penetrated on the slide seat 42 and spirally matched with the slide seat 42, the lead screw 43 is aligned with the brake head 300 up and down, and the top of the lead screw 43 is provided with a push rod 421 matching the brake head 300; the rotary drive member 44 is arranged on the fixed seat 41, and the output end is connected to the bottom end of the lead screw 43.

[0045] The rotating drive member 44 can be a motor. In order to ensure that the up and down movement distance of the push rod 421 is controllable, a position sensor can be set on the fixed seat 41. The rotating drive member 44 can also directly adopt a servo motor or a stepper motor. The controller controls its output speed to control the distance of the linear movement of the slide 42 driven by the screw 43. It can not only drive the slide 42 up and down to simulate the braking action through the screw 43, but also make the braking stroke of the push rod 421 on the brake head 300 controllable, thereby improving the test accuracy.

[0046] In some possible implementations, see Figure 2 and Figure 7 , both air inlet pipes 50 are provided with normally open solenoid valves, which are located between the first air pressure sensor and the air source; both air outlet pipes 60 are provided with second air pressure sensors. The normally open solenoid valves are electrically connected to the controller. When the gas introduced into the two air inlet pipes 50 by the air source reaches the target value, the controller controls the normally open solenoid valves to close. At this time, the air source can be closed and a pressure holding test can be performed on the front axle air inlet 301 and the rear axle air inlet 302, thereby avoiding the output pressure fluctuation of the air source from affecting the test result and improving the test accuracy; when the pressing mechanism 40 pushes the brake head 300 to form a braking state for the brake valve 30 to be tested, the two second air pressure sensors can respectively detect the pressure values ​​of the front axle air outlet 303 and the rear axle air outlet 304, thereby judging whether there is a leakage problem at the front axle air outlet 303 and the rear axle air outlet 304 of the brake valve 30 to be tested, thereby realizing accurate positioning of the leakage position of the brake valve 30 to be tested, which is conducive to repairing the brake valve 30 to be tested.

[0047] like Figure 2As shown, in some embodiments, one end of the two air inlet pipes 50 away from the brake valve 30 to be tested is commonly connected to a pressure reducing valve, and a pneumatic triplet (air filter, pressure reducing valve and oil mist collector) is connected between the pressure reducing valve and the air source. A first quick exhaust valve (specifically, a two-position three-way solenoid valve, which is used for quick exhaust after the test is completed, is connected in series to the air inlet pipe 50 and is connected to a muffler) is connected between the first air pressure sensor and the brake valve 30 to be tested on the two air inlet pipes 50; a second quick exhaust valve (a two-position three-way solenoid valve can also be used) is connected between the second air pressure sensor and the differential pressure gauge on the two air outlet pipes 60, and the air inlet end of the second quick exhaust valve is connected to the air outlet pipe 60, one of the air outlet ends is connected to an air storage tank (specifically, the capacity can be 0.5L, and after the test is completed, the gas in the air outlet pipe 60 is collected and stored for the next test, thereby reducing the amount of gas used in the next test and reducing the energy consumption of the test), and the other air outlet end is connected to a muffler (used for silencing when the air storage tank capacity is insufficient and the gas needs to be emptied).

[0048] On the basis of the above, combined with Figure 2 and Figure 7 It is understood that the test process of the commercial vehicle brake valve leakage detection device provided in this embodiment is:

[0049] The pressurized gas discharged from the air source is filtered by the pneumatic triplet and then passes through the pressure reducing valve to obtain a stable target pressure, and then is divided into two paths and enters the two intake pipes 50 respectively. One path passes through the normally open solenoid valve, the first air pressure sensor, and the quick exhaust valve in sequence and enters the front axle air inlet 301; the other path passes through the normally open solenoid valve, the first air pressure sensor, and the quick exhaust valve in sequence and enters the rear axle air inlet 302. Since the brake valve 30 to be tested is in a non-braking state at this time, the front axle air inlet 301 and the front axle air outlet 303 are not connected, and the rear axle air inlet 302 and the rear axle air outlet are not connected. 304 is not connected, so after reading the pressure values ​​of the two first air pressure sensors, the two normally open solenoid valves are closed to form a pressure-holding state. The pressure and duration of the pressure-holding state are implemented according to the automotive industry testing standards. After the pressure-holding is completed, the pressure values ​​of the two first air pressure sensors are read here and compared with the previous values ​​to determine whether they have dropped. If the pressure values ​​are inconvenient, it means that there is no leakage at the front axle air intake 301 and the rear axle air intake 302. If the value of the first air pressure sensor changes after the pressure-holding is completed, it can be determined that the corresponding front axle air intake 301 or the rear axle air intake 302 has a leakage fault.

[0050] After the front axle air inlet 301 and the rear axle air inlet 302 are tested and confirmed to be leak-free, the normally open solenoid valve is opened to continue inputting air pressure, and at the same time, the pressing mechanism 40 pushes the brake valve 30 to be tested to form a braking state. At this time, the front axle air inlet 301 is connected to the front axle air outlet 303, and the rear axle air inlet 302 is connected to the rear axle air outlet 304. The air pressure values ​​of the two air outlet pipes 60 are respectively detected by two second air pressure sensors, and when the air pressure value reaches the target value, the normally open solenoid valve is closed to maintain the pressure. After the pressure maintenance is completed according to industry standards, the reading Take the value of the pressure differential gauge. If the reading of the pressure differential gauge is zero, it means that the brake valve 30 to be tested has no leakage fault as a whole. If the pressure differential gauge shows a reading, the pressure value in the outlet pipe 60 connected to its low-pressure side decreases, thereby determining that the front axle outlet 303 or the rear axle outlet 304 connected to the outlet pipe 60 has an air leakage fault, or the air path seal or piston between the front axle outlet 303 and the front axle inlet 301, or between the rear axle outlet 304 and the rear axle inlet 302 inside the brake valve 30 to be tested has an air leakage fault.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Commercial vehicle brake valve leakage detection equipment, characterized in that: include: The frame is provided with a workbench horizontally, and the workbench is provided with a profiling fixture, and the profiling fixture is used to clamp and fix the brake valve to be tested; A pressing mechanism is arranged on the workbench and aligned with the brake head of the brake valve to be tested, and the pressing mechanism is used to push the brake head to make the brake valve to be tested form a braking state; Two air intake pipes, respectively connected to the front axle air intake port and the rear axle air intake port of the brake valve to be tested, and respectively used to connect to an air source, and both of the two air intake pipes are provided with a first air pressure sensor; Two air outlet pipes are respectively connected to the front axle air outlet and the rear axle air outlet of the brake valve to be tested, and the two air outlet pipes are commonly connected to a differential pressure gauge.

2. The commercial vehicle brake valve leakage detection device according to claim 1, characterized in that: The profiling fixture comprises: A support, arranged on the workbench, provided with a through hole on the support, the through hole being suitable for the output end of the pressing mechanism to pass through, the support being used to support the brake valve to be tested and align the brake head with the through hole; A bracket, arranged on the workbench and straddling above the support; A pressing plate is slidably connected to the bracket up and down, and a contour pressing head is provided on the lower plate surface of the pressing plate; The first driving member is arranged on the bracket, and the output end of the first driving member is connected to the pressing plate, and is used for driving the pressing plate to move downward so that the contoured pressing head presses the brake valve to be tested.

3. The commercial vehicle brake valve leakage detection device according to claim 2, characterized in that: The profiling fixture also includes: A first pushing member, horizontally arranged on the workbench and located on one side of the support; The second pushing member is horizontally arranged on the workbench and located at the other side of the support, and the output end of the second pushing member cooperates with the output end of the second pushing member to clamp the brake valve to be tested.

4. The commercial vehicle brake valve leakage detection device according to claim 3, characterized in that: An air circuit valve block is provided at the output end of the first pushing member, and the air circuit valve block has two air inlet connectors and two air outlet connectors; wherein the two air inlet connectors are respectively connected to the two air inlet pipes, and the two air inlet connectors are respectively sealed and abutted against the front axle air inlet and the rear axle air inlet; the two air outlet connectors are respectively connected to the two air outlet pipes, and the two air outlet connectors are respectively sealed and abutted against the front axle air outlet and the rear axle air outlet.

5. The commercial vehicle brake valve leakage detection device according to claim 3, characterized in that: A limit clamping seat is provided at the output end of the second pushing member, and the limit clamping seat is clamped with the peripheral wall of the brake valve to be tested.

6. The commercial vehicle brake valve leakage detection device according to claim 2, characterized in that: Two slide rails are spaced apart on the workbench, and at least one slider is slidably connected to each of the two slide rails, and the support is connected to each of the sliders; a second driving member is also provided on the workbench, and an output end of the second driving member is connected to the support for driving the support to move along the slide rails.

7. The commercial vehicle brake valve leakage detection device according to claim 6, characterized in that: The workbench is provided with a laser sensor and a proximity switch, wherein the sensing end of the laser sensor faces the position between the support and the contouring pressure head, and the proximity switch is aligned with the side wall of the support facing one end of the slide rail.

8. The commercial vehicle brake valve leakage detection device according to claim 2, characterized in that: The first driving member comprises: Two guide rods are arranged in parallel and at intervals and are respectively slidably arranged in the bracket in the vertical direction, and the lower ends of the two guide rods are respectively connected to the two ends of the pressing plate; The telescopic driving member is vertically arranged on the bracket and located between the two guide rods. The output end of the telescopic driving member is downward and connected to the pressing plate.

9. The commercial vehicle brake valve leakage detection device according to claim 2, characterized in that: The pressing mechanism comprises: A fixed seat, fixedly connected to the bottom surface of the workbench; A slide seat is slidably connected to the fixed seat in a vertical direction, and a push rod matching the brake head is provided on the slide seat, and the push rod is aligned with the through hole in the upper and lower directions; A lead screw is vertically arranged on the slide seat and is spirally matched with the slide seat; The rotary driving member is arranged on the fixing seat, and the output end is connected with the bottom end of the lead screw.

10. The commercial vehicle brake valve leakage detection device according to any one of claims 1 to 9, characterized in that: The two air inlet pipes are each provided with a normally open solenoid valve, and the normally open solenoid valve is located between the first air pressure sensor and the air source; the two air outlet pipes are each provided with a second air pressure sensor.

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