Fault diagnosis equipment for braking system of wheeled vehicle

Abstract

The utility model discloses wheeled vehicle braking system fault diagnosis equipment which comprises a shell, and a first air chamber is arranged in the shell. The first air chamber communicates with a second air chamber, and a first spring valve is arranged at the communicating position of the first air chamber and the second air chamber. The second air chamber is communicated with a third air chamber, and a second spring valve is arranged at the communication position of the second air chamber and the third air chamber. The first spring valve is movably connected with a threaded ejector rod; the first spring valve comprises a first spring, and the first spring is connected with a first valve body; the second spring valve comprises a second spring; the second spring is connected with a second valve body; the elasticity modulus of the first spring is greater than that of the second spring; the first air chamber is connected with a barometer; the first air chamber is communicated with a normally open air inlet valve; and the third air chamber is communicated with a normally open exhaust valve. According to the description of the scheme, the device has the advantages of being simple in structure, reasonable in design, small and portable, low in cost, capable of being operated by a single person, reliable in work and capable of being suitable for diagnosis of interface devices of different models.

Description

Technical Field

[0001] The utility model relates to the field of vehicle brake system maintenance, in particular to a wheeled vehicle brake system fault diagnosis device. Background Art

[0002] In the wheeled vehicle braking system, if the air pressure from any of the air compressor, dryer and four-line protection valve does not reach the standard value, it will cause the parking brake to fail to release, the driving brake to fail, the speed control device to fail to change speed, and the high and low gear conversion to be difficult, which will pose a great safety hazard to safe driving. Which of the air compressor, dryer and four-line protection valve is at fault? The current diagnostic method is elimination, which can only be eliminated by maintenance personnel using their accumulated experience or point by point. This diagnostic method is time-consuming and requires a lot of manpower, and is difficult in actual maintenance tasks. Utility Model Content

[0003] The utility model aims at the deficiencies in the prior art and provides a wheeled vehicle brake system fault diagnosis device which has a simple structure, reasonable design, is compact and portable, low cost, requires only one person to operate, works reliably, and can adapt to the diagnosis of different types of interface devices.

[0004] In order to achieve the above-mentioned object, the utility model provides a wheeled vehicle brake system fault diagnosis device, comprising a housing, wherein a first air chamber is arranged inside the housing;

[0005] The first air chamber is connected with the second air chamber, and a first spring valve is provided at the connection between the first air chamber and the second air chamber;

[0006] The second air chamber is connected to the third air chamber, and a second spring valve is provided at the connection between the second air chamber and the third air chamber;

[0007] The first spring valve is movably connected with a threaded ejector rod;

[0008] The first spring valve comprises a first spring, and the first spring is connected to a first valve body;

[0009] The second spring valve comprises a second spring, and the second spring is connected to a second valve body;

[0010] The elastic modulus of the first spring is greater than that of the second spring;

[0011] The first air chamber is connected to a pressure gauge;

[0012] The first air chamber is connected to a normally open air inlet valve;

[0013] The third air chamber is connected to a normally open exhaust valve.

[0014] Furthermore, the third air chamber is connected to an air passage, and the air passage is connected to a flow meter.

[0015] Furthermore, the housing is connected to a diaphragm, one side of the diaphragm is the first air chamber, the other side of the diaphragm is connected to the first spring, and one end of the first spring away from the first air chamber is movably connected to the threaded ejector rod;

[0016] The threaded push rod is threadably connected to the housing, and a knob is disposed at the outer end of the threaded push rod.

[0017] Furthermore, the first spring is connected to a first valve core, the first valve core is connected to a first valve body, and the first valve body moves in the first air chamber when it is separated from the communication port between the first air chamber and the second air chamber.

[0018] Furthermore, the first valve body is connected to a pull core, and the pull core is connected to a third valve body;

[0019] The second air chamber is provided with an air release port, the pull core passes through the second air chamber and the air release port, and the third valve body is located outside the air release port.

[0020] Furthermore, the second spring is located in the third air chamber, and the second valve body moves in the third air chamber when it is separated from the communication port between the second air chamber and the third air chamber.

[0021] Furthermore, the intake valve is matched with a first transition joint, a second transition joint and a third transition joint;

[0022] The other end of the first transition joint is matched with an air compressor;

[0023] The other end of the second transition joint matches the dryer;

[0024] The other end of the third transition joint is matched with a four-line protection valve.

[0025] Furthermore, one end of the first spring connected to the threaded push rod is fixedly connected to a push rod force bearing member, and a groove is provided on a side of the push rod force bearing member facing the threaded push rod, and the bottom of the groove is set to be conical.

[0026] After adopting this scheme, when working, diagnose the air compressor first.

[0027] First, connect the first transition joint to the air inlet valve and the air compressor respectively, and turn the knob to reduce the pressure of the first spring on the first valve body to a suitable value.

[0028] Start the air compressor, and the compressed air first enters the first air chamber, compresses the diaphragm and the first spring, and the first spring brings the first valve body away from the air inlet of the second air chamber. At the same time, the first valve body is brought by the pull core to the third valve body to close the air leakage port.

[0029] Since the elastic modulus of the first spring is greater than that of the second spring, the compressed air will inevitably push open the second valve body supported by the second spring and be discharged into the atmosphere through the airway to the exhaust valve.

[0030] The first spring valve is initially in a relaxed state, and the second spring valve tries its best to prevent the outflow of air, thereby establishing a state in which the first air chamber reaches the maximum air pressure more quickly.

[0031] Turn the knob to gradually increase the pressure of the first spring until the pressure gauge reading reaches 0.9Mpa. During this process, observe the flow meter reading. If the pressure gauge can reach 0.9Mpa and the flow display is normal, then the air compressor is fine; if it cannot reach 0.9Mpa, then there is a problem with the pressure relief valve of the air compressor; if it reaches 0.9Mpa but the flow is too small, then there is a problem with the air delivery pipeline of the air compressor.

[0032] Then, the steps for diagnosing the dryer and the four-line protection valve are the same, except that when diagnosing the dryer, replace the second transition joint; when diagnosing the four-line protection valve, replace the third transition joint.

[0033] The beneficial effects of this scheme can be known from the description of the above scheme. It has a simple structure and reasonable design and has the following advantages:

[0034] 1. The appearance of this equipment is a whole, with a reliable impact-resistant hard metal shell, which can ensure the reliability of the equipment during transportation and use, especially to meet the needs of use under various harsh conditions;

[0035] 2. Only one person is needed to operate it, no manpower is needed to drive it, which reduces the burden on maintenance personnel;

[0036] 3. The pressure gauge installed on the valve body can directly detect the pressure, which is intuitive and convenient;

[0037] 4. The pressure difference of gas output is controlled by the knob control spring. The operator can adjust the maintenance equipment according to the different pressures required by different models, which is convenient and practical;

[0038] 5. In order to cope with the maintenance of various types of interface equipment, replaceable transition joints of multiple specifications are adopted;

[0039] 6. The equipment is small in size, light in weight, easy to carry, low in production cost, strong in applicability and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the structure of the utility model;

[0041] Figure 2 It is a top view of the utility model;

[0042] Figure 3 for Figure 1 A-A sectional view;

[0043] Figure 4 This is a schematic diagram of the utility model connected to an air compressor structure;

[0044] Figure 5 This is a schematic diagram of the structure of the connection dryer of the utility model;

[0045] Figure 6 This is a schematic diagram of the structure of the utility model connecting four pipeline protection valves;

[0046] In the figure, 1, shell; 2, first air chamber; 3, second air chamber; 4, third air chamber; 5, threaded push rod; 6, first spring; 7, first valve body; 8, second spring; 9, second valve body; 10, pressure gauge; 11, intake valve; 12, exhaust valve; 13, airway; 14, flow meter; 15, diaphragm; 16, knob; 17, first valve core; 18, pull core; 19, third valve body; 20, first transition joint; 21, second transition joint; 22, third transition joint; 23, air compressor; 24 dryer; 25, four-line protection valve; 26, push rod force member. DETAILED DESCRIPTION

[0047] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0048] like Figure 1-4 As shown, this embodiment is a wheeled vehicle brake system fault diagnosis device, comprising a housing 1, wherein a first air chamber 2 is provided inside the housing 1;

[0049] The first air chamber 2 is connected to the second air chamber 3, and a first spring valve is provided at the connection between the first air chamber 2 and the second air chamber 3;

[0050] The second air chamber 3 is connected to the third air chamber 4, and a second spring valve is provided at the connection between the second air chamber 3 and the third air chamber 4;

[0051] The first spring valve is movably connected with a threaded push rod 5;

[0052] The first spring valve comprises a first spring 6, and the first spring 6 is connected to a first valve body 7;

[0053] The second spring valve comprises a second spring 8, and the second spring 8 is connected to a second valve body 9;

[0054] The elastic modulus of the first spring 6 is greater than that of the second spring 8;

[0055] The first air chamber 2 is connected to a barometer 10;

[0056] The first air chamber 2 is connected to a normally open air inlet valve 11;

[0057] The third air chamber 4 is connected to a normally open exhaust valve 12 .

[0058] Furthermore, the third air chamber 4 is connected to an air passage 13 , and the air passage 13 is connected to a flow meter 14 .

[0059] Furthermore, the housing 1 is connected with a diaphragm 15, one side of the diaphragm 15 is the first air chamber 2, the other side of the diaphragm 15 is connected with a first spring 6, and one end of the first spring 6 away from the first air chamber 2 is movably connected with a threaded push rod 5;

[0060] The threaded push rod 5 is threadably connected to the housing 1 , and a knob 16 is disposed at the outer end of the threaded push rod 5 .

[0061] Furthermore, the first spring 6 is connected to the first valve core 17 , and the first valve core 17 is connected to the first valve body 7 . When the first valve body 7 is separated from the communication port between the first air chamber 2 and the second air chamber 3 , it moves in the first air chamber 2 .

[0062] Furthermore, the first valve body 7 is connected to a pull core 18, and the pull core 18 is connected to a third valve body 19;

[0063] The second air chamber 3 is provided with an air release port, the pull core 18 passes through the second air chamber 3 and the air release port, and the third valve body 19 is located outside the air release port.

[0064] Furthermore, the second spring 8 is located in the third air chamber 4 , and the second valve body 9 moves in the third air chamber 4 when it is separated from the communication port between the second air chamber 3 and the third air chamber 4 .

[0065] Furthermore, the intake valve 11 is matched with a first transition joint 20, a second transition joint 21 and a third transition joint 22;

[0066] The other end of the first transition joint 20 is matched with an air compressor 23;

[0067] The other end of the second transition joint 21 matches the dryer 24;

[0068] The other end of the third transition joint 22 is matched with a four-line protection valve 25 .

[0069] Furthermore, one end of the first spring 6 connected to the threaded push rod 5 is fixedly connected to a push rod force bearing member 26 , and a groove is provided on a side of the push rod force bearing member 26 facing the threaded push rod 5 , and the bottom of the groove is set to be conical.

[0070] The air circuit of the wheeled vehicle starts with the air compressor 23 working after the engine is running. The working pressure standard of the air compressor 23 is 1Mpa, and the output pressure cannot be less than 0.85Mpa at least, otherwise it cannot provide enough air source for the whole vehicle. At present, there is no special tool to diagnose whether the air compressor 23 is faulty, and it can only be diagnosed by elimination method and experience method, which is not only time-consuming but also inaccurate fault judgment.

[0071] After the air compressor 23 is normal, if the dryer 24 fails and cannot output an air pressure greater than 0.8-0.82Mpa, the whole vehicle cannot provide sufficient air supply. Currently, there is no special tool to diagnose whether the dryer 24 is faulty. It can only be diagnosed by elimination and experience, which is not only time-consuming but also inaccurate.

[0072] After the air compressor 23 and the dryer 24 are normal, if the four-line protection valve 25 fails and cannot output an air pressure greater than 0.67-0.7Mpa, the entire vehicle cannot provide sufficient air supply. Currently, there is no special tool to diagnose whether the dryer 24 is faulty. It can only be diagnosed through elimination and experience, which is not only time-consuming but also inaccurate.

[0073] After adopting this scheme, when working, the air compressor 23 is diagnosed first.

[0074] First, the first transition joint 20 is respectively connected to the intake valve 11 and the air compressor 23. The knob 16 is rotated to reduce the pressure of the first spring 6 on the first valve body 7 to a suitable value.

[0075] Start the air compressor 23, and the compressed air first enters the first air chamber 2, and the compressed air squeezes the diaphragm 15 and the first spring 6. The first spring 6 brings the first valve body 7 away from the air inlet of the second air chamber 3. At the same time, the first valve body 7 is closed by the pull core 18 and the third valve body 19.

[0076] Since the elastic modulus of the first spring 6 is greater than that of the second spring 8 , the compressed air will inevitably push open the second valve body 9 supported by the second spring 8 and be discharged into the atmosphere through the air passage 13 to the exhaust valve 12 .

[0077] The first spring valve is initially in a relaxed state, and the second spring valve tries its best to prevent the outflow of air, thereby establishing a state in which the first air chamber 2 reaches the maximum air pressure more quickly.

[0078] Turn the knob 16 to gradually increase the pressure of the first spring 6 until the reading of the pressure gauge 10 reaches 0.9Mpa. During this process, observe the reading of the flow meter 14. If the pressure gauge 10 can reach 0.9Mpa and the flow display is normal, then the air compressor 23 is fine; if it cannot reach 0.9Mpa, then there is a problem with the pressure relief valve of the air compressor 23; if it reaches 0.9Mpa but the flow is too small, then there is a problem with the air delivery pipeline of the air compressor 23.

[0079] Then, the dryer 24 and the four-line protection valve 25 are diagnosed in the same steps except that the maximum air pressure is different.

[0080] like Figure 5 As shown, when diagnosing the dryer 24, the second transition joint 21 is connected to the dryer 24 and the air inlet valve 11 respectively, and the maximum air pressure during operation reaches 0.8-0.82Mpa.

[0081] like Figure 6 As shown, when diagnosing the four-line protection valve 25, the third transition joint 22 is connected to the four-line protection valve 25 and the intake valve 11 respectively, and the maximum air pressure during operation reaches 0.67-0.7Mpa.

[0082] The technical features not described in the present invention can be realized through or by adopting the existing technology, which will not be described here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A wheeled vehicle brake system fault diagnosis device, characterized in that: It comprises a shell, wherein a first air chamber is arranged inside the shell; The first air chamber is connected with the second air chamber, and a first spring valve is provided at the connection between the first air chamber and the second air chamber; The second air chamber is connected to the third air chamber, and a second spring valve is provided at the connection between the second air chamber and the third air chamber; The first spring valve is movably connected with a threaded ejector rod; The first spring valve comprises a first spring, and the first spring is connected to a first valve body; The second spring valve comprises a second spring, and the second spring is connected to a second valve body; The elastic modulus of the first spring is greater than that of the second spring; The first air chamber is connected to a pressure gauge; The first air chamber is connected to a normally open air inlet valve; The third air chamber is connected to a normally open exhaust valve.

2. A wheeled vehicle brake system fault diagnosis device according to claim 1, characterized in that: The third air chamber is connected to an air passage, and the air passage is connected to a flow meter.

3. A wheeled vehicle brake system fault diagnosis device according to claim 1, characterized in that: The housing is connected with a diaphragm, one side of the diaphragm is the first air chamber, the other side of the diaphragm is connected to the first spring, and one end of the first spring away from the first air chamber is movably connected to the threaded ejector rod; The threaded push rod is threadably connected to the housing, and a knob is disposed at the outer end of the threaded push rod.

4. A wheeled vehicle brake system fault diagnosis device according to claim 3, characterized in that: The first spring is connected to a first valve core, the first valve core is connected to a first valve body, and the first valve body moves in the first air chamber when it is separated from the communication port between the first air chamber and the second air chamber.

5. A wheeled vehicle brake system fault diagnosis device according to claim 4, characterized in that: The first valve body is connected to a pull core, and the pull core is connected to a third valve body; The second air chamber is provided with an air release port, the pull core passes through the second air chamber and the air release port, and the third valve body is located outside the air release port.

6. A wheeled vehicle brake system fault diagnosis device according to claim 1, characterized in that: The second spring is located in the third air chamber, and the second valve body moves in the third air chamber when the second valve body is separated from the communication port between the second air chamber and the third air chamber.

7. A wheeled vehicle brake system fault diagnosis device according to claim 1, characterized in that: The intake valve is matched with a first transition joint, a second transition joint and a third transition joint; The other end of the first transition joint is matched with an air compressor; The other end of the second transition joint matches the dryer; The other end of the third transition joint is matched with a four-line protection valve.

8. A wheeled vehicle brake system fault diagnosis device according to claim 1, characterized in that: One end of the first spring connected to the threaded push rod is fixedly connected to a push rod force bearing piece, and a groove is provided on a side of the push rod force bearing piece facing the threaded push rod, and the bottom of the groove is set to be conical.

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