Automatic detection method for abrasion limit of grinding element of bogie tread cleaning device

Abstract

The invention discloses an automatic detection method for the abrasion limit of a grinding element of a bogie tread cleaning device, and belongs to the technical field of rail vehicle bogie tread cleaning, and the method is based on a hardware platform of a vehicle and comprises a tread cleaning device, a CCU, an electromagnetic valve, an air pressure sensor, wheels, an HMI screen and an air source. The method comprises the steps that firstly, a CCU is used for controlling an electromagnetic valve in an air supply air path of the tread cleaning device to be opened or closed according to preset logic, secondly, the CCU is used for detecting the pressure value PSC of an air pressure sensor in an air pipeline of the tread cleaning device in real time, and recording and calculus calculation are conducted on the pressure value PSC detected by the air pressure sensor in real time and the change of time t; the CCU compares the tSC obtained through real-time calculation with the tM so as to judge whether the grinding piece is abraded to the limit or not, according to the automatic detection method, on the premise that new hardware is not added, the abrasion limit of the grinding piece is automatically detected in real time, and manpower, time and maintenance cost are effectively saved.

Description

Technical Field

[0001] The present invention relates to the technical field of tread cleaning of bogies for rail vehicles, and particularly relates to an automatic detection method for the wear limit of the grinding element of a bogie tread cleaning device. Background Art

[0002] The tread cleaning device is installed on the bogie frame. Its principle is a pneumatic control device with a cylinder and a piston inside, and a grinding element is installed at the front end of the piston. The movement of the grinding element is realized by the vehicle CCU according to a preset logic. By controlling the solenoid valve to open, compressed air is filled into the cylinder of the tread cleaning device to push the piston to move. Generally, a pressure sensor is also provided to monitor whether there is gas leakage in the system. Specifically, when the CCU controls the solenoid valve to open, the vehicle air source will fill compressed air into the cylinder to push the piston to move. The piston further drives the grinding element installed at the front end to approach the wheel tread until the grinding element contacts the wheel tread. After the grinding element contacts the wheel tread, it wears the wheel tread, improving the surface state of the wheel, increasing adhesion, and shaping the wheel, and also has the function of alleviating the development of wheel polygons. After the grinding element contacts and wears the wheel for a certain period, the grinding element will wear to the limit and cannot be used continuously, and needs to be replaced.

[0003] The traditional method for judging whether the grinding element needs to be replaced, that is, whether it has worn to the limit, is only visual inspection. Generally, the service life of the grinding element is initially evaluated based on operation experience. Then, during the service life of the grinding element, visual inspection is carried out at regular intervals. However, the above method for visually inspecting the wear limit of the grinding element has the following deficiencies:

[0004] First of all, visual inspection will consume a large amount of human and time costs. To ensure the reliability of the inspection results, generally 2 people are arranged to jointly confirm the inspection results. Taking an 8-car formation vehicle as an example, there are as many as 64 grinding elements configured, and the single maintenance time is at least 2 hours. Generally, the grinding elements need to be inspected 4 - 7 times during their entire life cycle. Secondly, there is a risk of missed inspection when visually inspecting at regular intervals, that is, the grinding element may wear to the limit during the inspection interval, causing the tread cleaning device to lose its existing function, and the metal back plate of the worn-to-limit grinding element will have hard contact with the wheel, scratching the wheel tread and bringing operation risks. Finally, reducing resistance is the development direction of future vehicles, and widely covering the bogie area is one of the effective measures for reducing resistance. Therefore, after the bogie is covered, additional disassembly of the bogie covering skirt is required to check the wear limit of the grinding element, which will inevitably further increase the maintenance workload and maintenance time of the maintenance personnel.

[0005] Therefore, based on the existing hardware of the tread cleaning device and control system, how to provide an automatic and accurate detection method for the wear of the grinding block of the bogie tread cleaning device to the limit without additional hardware or changing the tread cleaning device is a problem that those skilled in the art need to solve. Summary of the Invention

[0006] The object of the present invention is to overcome the defects of the existing technology and provide an automatic detection method for the wear limit of the grinding block of the bogie tread cleaning device, which can reduce the occupation of human and time costs by visual inspection, accurately identify the wear state of the grinding block, and avoid the problem of scratching of the wheel by the steel back of the grinding block after missed detection by visual inspection.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The automatic detection method for the wear limit of the grinding block of the bogie tread cleaning device disclosed in the present invention, based on the hardware platform of the vehicle, includes: tread cleaning device, CCU, solenoid valve, air pressure sensor, wheel, HMI screen, air source;

[0009] The automatic detection method includes:

[0010] S1: Use the CCU to control the opening or closing of the solenoid valve in the air supply circuit of the tread cleaning device according to the preset logic, and record the moment when the CCU issues the solenoid valve opening signal as t = t 0 ;

[0011] S2: At the moment of t 0 , after the CCU issues the solenoid valve opening signal, the CCU real-time detects the pressure value P of the air pressure sensor in the air pipeline of the tread cleaning device SC , and records the change relationship between the pressure value P SC detected by the air pressure sensor in real time and time t as P SC = f(t);

[0012] S3: At the moment of t 0 , after the CCU issues the solenoid valve opening signal, the CCU performs real-time differential operation on the detected P SC , and the result can be obtained

[0013] S4: At the moment of t 1 , when the CCU determines that f'(t 1 ) = 0 and f(t 1 ) = P M , it can be known that at this time the grinding block has been closely attached to the wheel. The CCU calculates and stores the time t SC used from the start of air charging of the tread cleaning device to the process of the grinding block being closely attached to the wheel. t SC = t1 -t 0 .

[0014] Further, S5: In the above step, the CCU calibrates and calculates the t of the grinding wheel that has been worn to the limit. SC , and assume that t SC =t M , the calibrated t M Pre-stored in CCU for comparison.

[0015] Further, S6: the CCU calculates the t SC With t M For comparison:

[0016] ①t SC <t M When the grinding wheel of the tread cleaning device is worn to the limit, it can be judged that the grinding wheel of the tread cleaning device has not been worn to the limit;

[0017] ②t SC ≥t M When the grinding wheel of the tread cleaning device is worn to the limit, it can be judged that the grinding wheel of the tread cleaning device has been worn to the limit and needs to be replaced immediately.

[0018] Furthermore, in S6, it is determined that the grinding disc has been worn to the limit and needs to be replaced immediately. The CCU reports the information that the grinding disc has been worn to the limit and displays it on the HMI screen, and automatically shields the solenoid valve corresponding to the tread cleaning device where the grinding disc has been worn to the limit, so that its state always remains in the closed state.

[0019] Further, S7: After the operation and maintenance personnel replace the new grinding wheel, they can perform a confirmation operation on the HMI screen after the grinding wheel replacement is completed. After the CCU receives the confirmation information from the HMI screen that the grinding wheel replacement is completed, the CCU releases the shielding state of the solenoid valve and removes the prompt information on the HMI screen that the grinding wheel needs to be replaced, so that the tread cleaning device can work normally.

[0020] Further, S2:P SC The maximum value that can be achieved depends on the system wind source pressure P M .

[0021] In the above technical solution, the automatic detection method of the wear limit of the grinding wheel of the bogie tread cleaning device provided by the present invention has the following beneficial effects:

[0022] The automatic detection method designed by the present invention realizes the automatic real-time detection of the wear limit of the grinding wheel without adding new hardware, which effectively saves manpower, time and maintenance costs.

[0023] Compared with the prior art, this method:

[0024] 1) It can automatically detect the wear limit of the grinding disc in real time and remind the operation and maintenance personnel to replace the grinding disc in time after the grinding disc is worn to the limit, saving the manpower and time cost caused by visual inspection of the wear limit of the grinding disc;

[0025] 2) It can automatically detect the wear limit of the grinding wheel in real time, completely eliminating the risk of missed inspections in the existing technical solution of visual inspections at regular intervals, avoiding the failure of the tread cleaning device due to the failure to replace the grinding wheel in time after the grinding wheel is worn to the limit, and the risk of scratches on the wheel tread caused by the metal back plate of the grinding wheel;

[0026] 3) The detection result of the grinding disc wear limit is more accurate. The CCU will make judgments based on preset logic instead of subjective judgments based on the operation and maintenance personnel's own experience, which completely avoids the misdetection of the grinding disc wear limit due to differences in the ability levels or experience of different operation and maintenance personnel.

[0027] 4) After replacing the electric tread cleaning device or adding a displacement sensor, the purpose of detecting the wear limit of the grinding disc can also be achieved by referring to the present invention. However, it will lead to the scrapping of the pneumatic tread cleaning device widely used in the prior art solution and the need to re-lay the sensor and control cables, which will increase the implementation cost of the solution. The present method can realize the real-time and accurate detection function of the wear limit of the grinding disc based on the existing vehicle hardware settings without adding new hardware, and has better economy and feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic diagram of hardware principle in the prior art;

[0030] Figure 2 It is a logic schematic diagram of an automatic detection method of the wear limit of the grinding wheel of a bogie tread cleaning device disclosed in the present invention;

[0031] Figure 3 The invention discloses a schematic diagram of a method for automatically detecting the wear limit of a grinding wheel of a bogie tread cleaning device.

[0032] Description of reference numerals:

[0033] 1. Tread cleaning device; 1-1. Cylinder; 1-2. Piston; 1-3. Grinding wheel; 2. CCU; 3. Solenoid valve; 4. Air pressure sensor; 5. Wheel; 6. HMI screen; 7. Air source; 8. Air pipeline; 9. Cable. Detailed implementation mode

[0034] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] See Figure 1 as shown

[0036] In the prior art, the existing hardware platform of a vehicle includes: a tread cleaning device 1, a CCU (Central Control Unit) 2, a solenoid valve 3, a pressure sensor 4, a wheel 5, an HMI screen 6, and an air source 7;

[0037] Among them, the tread cleaning device 1 has a cylinder 1-1, a piston 1-2, and a grinding element 1-3;

[0038] This hardware platform further includes an air pipeline 8 connecting the cylinder 1-1, the solenoid valve 3, the pressure sensor 4, and the air source 7, and a cable 9 electrically connecting the CCU 2, the solenoid valve 3, the pressure sensor 4, and the HMI screen 6 and transmitting electrical signals.

[0039] Based on the above existing hardware platform of the vehicle, an automatic detection method for the wear limit of the grinding element of the bogie tread cleaning device of the present invention includes the following steps:

[0040] S1: The CCU 2 controls the opening or closing of the solenoid valve 3 in the air supply pipeline of the tread cleaning device 1 according to a preset logic, and records the moment when the CCU 2 issues a solenoid valve 3 opening signal as t = t 0 ;

[0041] S2: At the moment of t 0 , after the CCU 2 issues a solenoid valve 3 opening signal, the CCU 2 continuously detects the pressure value P of the pressure sensor 4 in the air pipeline of the tread cleaning device 1 SC , and records the change relationship between the pressure value P SC continuously detected by the pressure sensor 4 and time t as P SC = f(t), and the maximum value that P SC can reach depends on the system air source wind pressure P M ;

[0042] S3: At the moment of t 0 , after the CCU 2 issues a solenoid valve 3 opening signal, the CCU 2 performs a real-time differential operation on the detected P SC , and the result can be obtained

[0043] S4: At the moment of t 1 (t 1 > t 0 ), when the CCU 2 determines that f'(t 1 ) = 0, and f(t1 ) = P M When it is known that the lapping members 1-3 are in close contact with the wheel 5 at this time. The CCU2 calculates and stores the time t used from the start of air charging of the tread cleaning device 1 to the process when the lapping members 1-3 are in close contact with the wheel 5 SC , obviously t SC = t 1 - t 0 .

[0044] S5: According to the above steps, the CCU2 calibrates and calculates the t of the lapping members 1-3 that have worn to the limit SC , and set the t at this time SC = t M , and pre-store the calibrated t M in the CCU2 for comparison

[0045] S6: The CCU2 compares the real-time calculated t SC with t M : ① When t SC < t M , it can be judged that the lapping members 1-3 have not worn to the limit; ② When t SC ≥ t M , it can be judged that the lapping members 1-3 have worn to the limit and need to be replaced immediately. At this time, the CCU2 reports the information that the lapping members 1-3 have worn to the limit and displays it on the HMI screen 6, reminding the operation and maintenance personnel to replace it in time, and automatically shields the solenoid valve 3 corresponding to the tread cleaning device 1 where the lapping members 1-3 have worn to the limit, so that its state always remains in the closed state to avoid the steel back of the lapping members 1-3 from scratching the tread of the wheel

[0046] S7: After the operation and maintenance personnel replace the new lapping members 1-3, they can perform the confirmation operation after the replacement of the lapping members 1-3 on the HMI screen 6. After the CCU2 receives the confirmation information that the lapping members have been replaced sent by the HMI screen 6, the CCU2 releases the shielding state of the solenoid valve 3 and at the same time releases the prompt information on the HMI screen 6 that the lapping members 1-3 need to be replaced, so that the tread cleaning device 1 can work normally

[0047] Refer to Figures 1 - 3 , in a specific embodiment

[0048] S1: At the moment of t = t 0 , the CCU2 sends out a signal to open the solenoid valve 3. After the solenoid valve 3 is opened, the compressed air in the air source 7 will enter the cylinder 1-1 of the tread cleaning device 1 through the air pipeline, and push the piston 1-2 to drive the lapping members 1-3 to extend until the lapping members 1-3 are in contact with the wheel 5, and the CCU2 records the moment of t 0 ;

[0049] S2: Since t = t 0Starting from the moment, the pressure sensor 4 will send the air pressure value P detected in real time SC to the CCU2. According to Figure 1 and Figure 3 , it can be known that at this time, P SC will continuously increase with the increase of time t until it reaches the maximum air pressure P M that the air source 7 can provide. Let the relationship between the pressure value P SC and time t be P SC = f(t), and P SC = f(t) is recorded by the CCU2;

[0050] S3: Starting from the moment t = t 0 , the CCU2 will perform a real-time differential operation on P SC from the pressure sensor 4, that is recorded by the CCU2;

[0051] S4: At the moment t = t 1 (t 1 > t 0 ), according to Figure 3 , the criterion for the lapping heads 1-3 to be in close contact with the wheel 5 can be obtained as "f'(t 1 ) = 0 and f(t 1 ) = P M ". When the criterion is met, the CCU2 records the moment t 1 ;

[0052] S5: The CCU2 calculates the time t SC used from the start of air charging of the tread cleaning device 1 to the moment when the lapping heads 1-3 are in close contact with the wheel 5. Obviously, t SC = t 1 - t 0 ;

[0053] S6: The CCU2 is calibrated with the lapping heads 1-3 worn to the limit. According to the algorithms in steps 1-5 above, the CCU2 calculates the t SC of the lapping heads 1-3 worn to the limit, and sets the t SC of the lapping heads 1-3 worn to the limit to be t M . The calibrated t M is pre-stored in the CCU2.

[0054] S7: Replace the lapping heads 1-3 in the normal state. The CCU2 compares the real-time calculated t SC with t M :

[0055] ① When t SC < t M , it can be judged that the lapping heads are not worn to the limit;

[0056] ②t SC ≥t M When it is ≥t, it can be judged that the lapping tool has worn to the limit and needs to be replaced immediately. At this time, the CCU2 reports the information that "the lapping tool has worn to the limit" and displays it on the HMI screen 6, prompting the operation and maintenance personnel to replace the new lapping tool 1-3 in time. At this time, the CCU2 will automatically shield the solenoid valve 3 corresponding to the tread cleaning device where the lapping tool 1-3 has worn to the limit, so that its state always remains in the non-openable state, avoiding scratching the wheel tread by the steel back of the lapping tool 1-3;

[0057] S8: After the operation and maintenance personnel replace the new lapping tool 1-3, they can perform the operation of "confirming that the lapping tool replacement is completed" on the HMI screen 6, so that the CCU2 simultaneously releases the shielding of the solenoid valve 3 and the status prompt of "the lapping tool has worn to the limit" on the HMI screen 6, enabling the tread cleaning device 1 to work normally.

[0058] It should be clear that the above specific implementation manners are only for the detection description of the wear limit of the lapping tool of a set of tread cleaning devices. Those skilled in the art can, based on the method of the present invention, expand the above method to all tread cleaning devices on the whole train, or integrate the method of the present invention through other logic controllers instead of the CCU2, or nest the method of the present invention into the control logic of the existing tread cleaning device to form a new control method. The above changes or combinations based on the method of the present invention can also achieve the purpose of automatically detecting the wear limit of the lapping tool;

[0059] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. Automatic detection method of wear limit of grinding wheel of bogie tread cleaning device, based on vehicle hardware platform including: The tread cleaning device (1), CCU (2), solenoid valve (3), air pressure sensor (4), wheel (5), HMI screen (6), wind source (7), characterized in that; The automatic detection method includes: S1: Using the CCU (2) to control the electromagnetic valve (3) in the air supply path of the tread cleaning device (1) to open or close according to a preset logic, and the time when the CCU (2) sends the electromagnetic valve (3) opening signal is recorded as t=t0; S2: At time t0, after the CCU (2) sends a signal to open the electromagnetic valve (3), the CCU (2) detects the pressure value P of the air pressure sensor (4) in the air pipeline of the tread cleaning device (1) in real time. SC The pressure value P detected by the air pressure sensor (4) in real time SC The relationship between the change of t and time is recorded as P SC =f(t); S3: At time t0, after CCU (2) sends a signal to open the solenoid valve (3), CCU (2) detects the P SC Perform real-time differential calculations to obtain S4: At time t1, when CCU (2) determines f't1 = 0 and ft1 = P M When the grinding wheel (1-3) is in close contact with the wheel (5), the CCU (2) calculates and stores the time t from the start of air filling of the tread cleaning device (1) to the close contact of the grinding wheel (1-3) with the wheel (5). SC , t SC =t1-t0.

2. The automatic detection method of the wear limit of the grinding wheel of the bogie tread cleaning device according to claim 1 is characterized in that ； S5: According to the above steps, the CCU (2) calibrates and calculates the t of the grinding wheel (1-3) that has been worn to the limit. SC , and assume that t SC =t M , the calibrated t M Pre-stored in CCU (2) for comparison.

3. The automatic detection method of the wear limit of the grinding wheel of the bogie tread cleaning device according to claim 2 is characterized in that ； S6: CCU (2) calculates t in real time SC With t M For comparison: ①t SC <t M When the grinding element (1-3) of the tread cleaning device (1) is worn to the limit, it can be judged that the grinding element (1-3) of the tread cleaning device (1) has not been worn to the limit; ②t SC ≥t M When the grinding wheel (1-3) of the tread cleaning device (1) is worn to the limit, it can be judged that the grinding wheel (1-3) of the tread cleaning device (1) has been worn to the limit and needs to be replaced immediately.

4. The automatic detection method of the wear limit of the grinding wheel of the bogie tread cleaning device according to claim 3 is characterized in that ； In the above S6, it is determined that the grinding disc (1-3) has been worn to the limit and needs to be replaced immediately. The CCU (2) reports the information that the grinding disc (1-3) has been worn to the limit and displays it on the HMI screen (6), and automatically shields the solenoid valve (3) corresponding to the tread cleaning device (1) where the grinding disc (1-3) has been worn to the limit, so that its state is always kept in the closed state.

5. The automatic detection method of the wear limit of the grinding wheel of the bogie tread cleaning device according to claim 4 is characterized in that ； S7: After the operation and maintenance personnel replace the grinding disc (1-3) with a new one, they can confirm the replacement of the grinding disc (1-3) on the HMI screen (6). After the CCU (2) receives the confirmation information sent by the HMI screen (6) that the grinding disc has been replaced, the CCU (2) releases the shielding state of the solenoid valve (3) and removes the prompt information on the HMI screen (6) that the grinding disc (1-3) needs to be replaced, so that the tread cleaning device (1) can work normally.

6. The automatic detection method of the wear limit of the grinding wheel of the bogie tread cleaning device according to claim 1 is characterized in that ； S2:P SC The maximum value that can be achieved depends on the system wind source pressure P M .

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