Pneumatic control switching valve motion state detection device and method

Abstract

The invention provides a device and method for detecting the motion state of a pneumatic control switching valve. The device comprises an electromagnetic valve, the pneumatic control switching valve, a first pressure sensor, a second pressure sensor and signal collecting and processing equipment. One end of the first pressure sensor is connected between the electromagnetic valve and the pneumatic control switching valve, and the first pressure sensor is used for collecting the pilot pressure of the pneumatic control switching valve and converting the pilot pressure into a pilot pressure signal; the second pressure sensor is connected with the pneumatic control switching valve and is used for collecting the output pressure of the pneumatic control switching valve and converting the output pressure into an output pressure signal; and the signal collecting and processing equipment is used for collecting a control signal, a pilot pressure signal and an output pressure signal of the electromagnetic valve and detecting the motion state of the pneumatic control switching valve according to the collected signals. Detection, judgment and optimization of the switching action state and the controlled pressure response state of the pneumatic control switching valve are achieved, the overhaul and maintenance cost is reduced, the safety and reliability of a railway vehicle braking system are improved, and high efficiency and economical efficiency of train operation are guaranteed.

Description

Technical Field

[0001] The present application relates to the field of rail transit braking technology, and in particular to a device and method for detecting the motion state of an air-controlled switching valve. Background Art

[0002] The pneumatic switching valve commonly used in rail transit train braking systems is a pilot-operated two-position three-way pneumatic valve, whose pilot pressure is controlled by the solenoid valve. When the solenoid valve is in the cut-off position, the pilot pressure is zero, the piston of the pneumatic switching valve is at the proximal end, the input port and the output port are connected, the upstream pressure flows to the output port through the input port, and flows to the downstream, at this time the pneumatic switching valve is in the conducting state; when the solenoid valve is in the connected position, the piston moves to the other side under the action of the pilot pressure, the input port and the output port are isolated, the output port and the exhaust port are connected, the downstream pressure is discharged to the atmosphere through the exhaust port, at this time the pneumatic switching valve is in the exhaust state, thereby realizing the switching control of the downstream pressure.

[0003] The control of the conduction and cutoff of the air circuit by the air-controlled switching valve is achieved through the three dynamic seals on the piston. When the two air circuit holes are located between two adjacent dynamic seals, the two are conducted; when the two air circuit holes are arranged on both sides of a dynamic seal, the two are cut off. This conduction and switching state is controlled by the movement of the piston. In the rail vehicle braking system, compressed air is the main carrier for braking signal transmission and power application, so the switching control of the air circuit is very important. The action sensitivity of the air-controlled switching valve in the key module of the system directly determines the braking efficiency, which directly affects the driving safety. Therefore, it is very important to detect and adjust the movement state of the piston of the air-controlled switching valve. The switching speed of the air-controlled switching valve is determined by the movement response speed of the piston under the action of the pilot pressure or the return spring force. Therefore, the running resistance of the piston seal is an important factor affecting its switching sensitivity. When the switching sensitivity decreases, it indicates that the running resistance of the piston seal is too large, and it is necessary to adjust and improve its lubrication state in time.

[0004] In order to achieve the sensitivity of switching action, the existing pneumatic switching valves are greased on the inner surface of the piston cylinder and the seal during assembly, and low-friction coefficient matching materials or surface treatment are used. However, it is impossible to detect and judge the switching state, nor is it possible to quantitatively judge the current operating state of the pneumatic switching valve and identify risks. When a braking function failure occurs due to untimely switching, the fault can only be handled passively by replacing the pneumatic switching valve or disassembling and repairing it, which seriously affects the functionality of the braking system and the safety of train operation. Summary of the invention

[0005] In response to the problems in the prior art, the embodiments of the present application provide a device and method for detecting the motion state of an air-controlled switching valve, which can at least partially solve the problems in the prior art.

[0006] In a first aspect, the present application provides a device for detecting the motion state of a gas-controlled switching valve, comprising: a solenoid valve, a gas-controlled switching valve, a first pressure sensor, a second pressure sensor, and a signal acquisition and processing device;

[0007] One end of the first pressure sensor is connected between the solenoid valve and the air-controlled switching valve, and is used to collect the pilot pressure output by the solenoid valve to the air-controlled switching valve under the control pressure and convert it into a pilot pressure signal;

[0008] One end of the second pressure sensor is connected to the gas-controlled switching valve, and is used to collect the output pressure of the gas-controlled switching valve and convert it into an output pressure signal;

[0009] The signal acquisition and processing device is connected to the solenoid valve, the other end of the first pressure sensor and the other end of the second pressure sensor, and is used to collect the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor, and detect the movement state of the air-controlled switching valve according to the control signal, the pilot pressure signal and the output pressure signal.

[0010] Further, the air-controlled switching valve comprises: a grease injection port;

[0011] When the motion state of the air-controlled switching valve detected by the signal acquisition and processing device is abnormal, the injection device injects grease through the grease injection port to optimize the motion state of the air-controlled switching valve.

[0012] Furthermore, the air-controlled switching valve further comprises: a piston, a piston sleeve, a sealing ring and a lubrication point;

[0013] The piston sleeve wraps the piston, the lubrication point is arranged on the inner wall of the piston sleeve, and the sealing ring is arranged on the piston;

[0014] The lubrication point is connected to the grease injection port through a channel, and the grease injected from the grease injection port flows to the lubrication point through the channel to lubricate the sealing ring.

[0015] Furthermore, the grease injection port is provided with a non-return one-way valve for preventing the grease and the gas in the valve from flowing out of the air-controlled switching valve.

[0016] Further, it also includes: an output device;

[0017] The output device is connected to the signal acquisition and processing device, and is used to output a warning signal when the motion state of the air-controlled switching valve detected by the signal acquisition and processing device is abnormal.

[0018] Furthermore, the signal acquisition and processing device comprises:

[0019] A signal acquisition board, used for acquiring the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor;

[0020] A signal processing board is used to determine the exhaust response time, exhaust time, charging response time and charging time according to the control signal, the pilot pressure signal and the output pressure signal; and to determine the movement state of the air-controlled switching valve according to the exhaust response time, the exhaust time, the charging response time and the charging time.

[0021] In a second aspect, the present application provides a method for detecting the motion state of an air-controlled switching valve, which is applied to the device for detecting the motion state of an air-controlled switching valve described in any of the above embodiments, comprising:

[0022] The first pressure sensor collects the pilot pressure output by the solenoid valve to the air-controlled switching valve under the control pressure and converts it into a pilot pressure signal;

[0023] The second pressure sensor collects the output pressure of the air-controlled switching valve and converts it into an output pressure signal;

[0024] The signal acquisition and processing device acquires the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor, and detects the movement state of the air-controlled switching valve according to the control signal, the pilot pressure signal and the output pressure signal.

[0025] Furthermore, the signal acquisition and processing device includes a signal acquisition board and a signal processing board; the signal acquisition and processing device acquires the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor, and the output pressure signal of the second pressure sensor, and detects the motion state of the air-controlled switching valve according to the control signal, the pilot pressure signal, and the output pressure signal, including:

[0026] The signal acquisition board collects the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor;

[0027] The signal processing board determines the exhaust response time, exhaust time, charging response time and charging time according to the control signal, the pilot pressure signal and the output pressure signal;

[0028] The signal processing board determines the motion state of the air-controlled switching valve according to the exhaust response time, the exhaust time, the charging response time and the charging time.

[0029] Furthermore, it also includes:

[0030] When the movement state of the gas-controlled switching valve detected by the signal acquisition and processing device is abnormal, an output device connected to the signal acquisition and processing device outputs a warning signal.

[0031] Furthermore, it also includes:

[0032] When the motion state of the air-controlled switching valve detected by the signal acquisition and processing device is abnormal, the injection device injects grease through the grease injection port of the air-controlled switching valve to optimize the motion state of the air-controlled switching valve.

[0033] The present application provides a device and method for detecting the motion state of an air-controlled switching valve, which comprises an electromagnetic valve, an air-controlled switching valve, a first pressure sensor, a second pressure sensor and a signal acquisition and processing device; one end of the first pressure sensor is connected between the electromagnetic valve and the air-controlled switching valve, and is used to collect the pilot pressure output by the electromagnetic valve to the air-controlled switching valve under the action of the control pressure and convert it into a pilot pressure signal; one end of the second pressure sensor is connected to the air-controlled switching valve, and is used to collect the output pressure of the air-controlled switching valve and convert it into an output pressure signal; the signal acquisition and processing device is connected to the electromagnetic valve, the other end of the first pressure sensor and the other end of the second pressure sensor, and is used to collect the control signal of the electromagnetic valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor, and detects the motion state of the air-controlled switching valve according to the control signal, the pilot pressure signal and the output pressure signal, thereby realizing the detection, judgment and optimization of the switching action state of the air-controlled switching valve and the controlled pressure response state, greatly reducing the inspection and maintenance costs, improving the safety and reliability of the rail vehicle braking system, and ensuring the efficiency and economy of train operation.

[0034] Among them, the signal acquisition and processing equipment is used to collect the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor, and the output pressure signal of the second pressure sensor, so that the current operating status can be actively grasped in real time, without having to wait for the air-controlled switching valve to be repaired or even when a functional failure occurs during operation, and then passively know its operating status through disassembly inspection and other methods. In addition, through the grease injection port of the air-controlled switching valve, when the abnormal movement state of the air-controlled switching valve is detected and an early warning signal is received, the operator can improve the lubrication state of the air-controlled switching valve without disassembling it, and restore its low response time and high sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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 or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of a gas-controlled switching valve motion state detection device provided in one embodiment of the present application;

[0037] Figure 2 It is a structural schematic diagram of a signal acquisition and processing device provided in one embodiment of the present application;

[0038] Figure 3 It is a structural schematic diagram of a gas-controlled switching valve provided in one embodiment of the present application;

[0039] Figure 4 It is a structural schematic diagram of a gas-controlled switching valve provided in one embodiment of the present application;

[0040] Figure 5 It is a structural schematic diagram of a piston sleeve and lubrication points provided in one embodiment of the present application;

[0041] Figure 6 It is a structural schematic diagram of a non-return one-way valve at a grease injection port provided in one embodiment of the present application;

[0042] Figure 7 It is a schematic diagram of the relationship between signals and pressure in a motion state detection process provided by an embodiment of the present application;

[0043] Figure 8 It is a flow chart of a method for detecting the motion state of an air-controlled switching valve provided in one embodiment of the present application;

[0044] Fig. 9 It is a flow chart of a method for detecting the motion state of an air-controlled switching valve provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0046] Figure 1 is a schematic diagram of the structure of a device for detecting the motion state of a gas-controlled switching valve provided in an embodiment of the present application. Figure 1As shown, the air-controlled switching valve motion state detection device provided in the present application includes: a solenoid valve 101, an air-controlled switching valve 102, a first pressure sensor 103, a second pressure sensor 104 and a signal acquisition and processing device 105;

[0047] Specifically, the pilot pressure T is controlled by controlling the on and off of the solenoid valve 101 through an electrical signal, so that the two-position three-way air-controlled switching valve 102 can realize the switching action. When the solenoid valve 101 loses power, the control pressure R is cut off, the pilot pressure T is 0, and the air-controlled switching valve 102 is in the on state, and the input pressure C outputs the pressure C1 to the downstream; when the solenoid valve 101 is energized, the control pressure R is turned on, and the pilot pressure T is equal to R. At this time, the air-controlled switching valve 102 switches to the exhaust state, cuts off the input pressure C, and exhausts the downstream pressure C1 to the atmosphere.

[0048] One end of the first pressure sensor 103 is connected between the solenoid valve 101 and the air-controlled switching valve 102, and is used to collect the pilot pressure output from the solenoid valve 101 to the air-controlled switching valve 102 and convert it into a pilot pressure signal;

[0049] One end of the second pressure sensor 104 is connected to the gas-controlled switching valve 102, and is used to collect the output pressure of the gas-controlled switching valve 102 and convert it into an output pressure signal;

[0050] Specifically, the first pressure sensor 103 collects the pilot pressure T outputted from the solenoid valve 101 to the air-controlled switching valve 102 and converts it into a pilot pressure signal, and the second pressure sensor 104 collects the output pressure C1 of the air-controlled switching valve 102 and converts it into an output pressure signal.

[0051] In one embodiment, the control pressure R and the input pressure C are maintained at predetermined pressure values.

[0052] The signal acquisition and processing device 105 is connected to the solenoid valve 101, the other end of the first pressure sensor 103 and the other end of the second pressure sensor 104, and is used to collect the control signal of the solenoid valve 101, the pilot pressure signal of the first pressure sensor 103 and the output pressure signal of the second pressure sensor 104, and detect the movement state of the air-controlled switching valve 102 according to the control signal, the pilot pressure signal and the output pressure signal.

[0053] Specifically, the signal acquisition device collects the control signal of the solenoid valve 101, the pilot pressure signal of the first pressure sensor 103 and the output pressure signal of the second pressure sensor 104, and processes the collected control signal, pilot pressure signal and output pressure signal to determine the movement state of the air-controlled switching valve 102.

[0054] Figure 2 is a schematic diagram of the structure of a signal acquisition and processing device 105 provided in an embodiment of the present application. Figure 2 As shown, the signal acquisition and processing device 105 includes:

[0055] A signal acquisition board 201 is used to acquire the control signal of the solenoid valve 101 , the pilot pressure signal of the first pressure sensor 103 , and the output pressure signal of the second pressure sensor 104 ;

[0056] The signal processing board 202 is used to determine the exhaust response time, exhaust time, charging response time and charging time according to the control signal, the pilot pressure signal and the output pressure signal; and determine the movement state of the air-controlled switching valve 102 according to the exhaust response time, the exhaust time, the charging response time and the charging time.

[0057] Specifically, the signal acquisition board 201 acquires the control signal, the pilot pressure signal and the output pressure signal, and the signal processing board 202 obtains the corresponding relationship of the control signal, the pilot pressure T and the output pressure C1 of the solenoid valve 101 in time sequence from the signal acquired by the signal acquisition board 201. The corresponding relationship is as follows: Figure 7 The signal processing board 202 analyzes the motion state of the air-controlled switching valve 102 according to the corresponding relationship among the control signal of the solenoid valve 101 , the pilot pressure T and the output pressure C1 in the time sequence.

[0058] When the control signal of the solenoid valve 101 is de-energized, the solenoid valve 101 is in the cut-off position, the pilot pressure T is 0, the air-controlled switching valve 102 is in the on position, and the output pressure C1 is equal to the input pressure C; when the control signal of the solenoid valve 101 is switched from de-energized to energized, the solenoid valve 101 is switched from the cut-off position to the on position, at which time the pilot pressure T begins to rise, and the air-controlled switching valve 102 is switched from the on position to the exhaust position under the action of the pilot pressure T, and the output pressure C1 is gradually discharged to 0. The signal processing board 202 calculates the exhaust response time t1 of the air-controlled switching valve 102 according to the signal collected by the signal acquisition board 201, that is, the time interval from when the control signal of the solenoid valve 101 switches from power-off to power-on to when the output pressure C1 of the air-controlled switching valve 102 starts to drop; the exhaust time t2 of the air-controlled switching valve 102 is calculated according to the signal collected by the signal acquisition board 201, that is, the time interval from when the control signal of the solenoid valve 101 switches from power-off to power-on to when the output pressure C1 of the air-controlled switching valve 102 drops to a preset pressure (e.g., 10% of the starting pressure, C 10％ ) time interval.

[0059] When the control signal of the solenoid valve 101 switches from energized to de-energized, the solenoid valve 101 switches from the on position to the off position, at which time the pilot pressure T gradually decreases to 0, the air-controlled switching valve 102 switches from the exhaust position to the on position, and the output pressure C1 gradually increases from 0 to equal the input pressure C. The signal processing board 202 calculates the air-charging response time t3 of the air-controlled switching valve 102 based on the signal collected by the signal acquisition board 201, that is, the time interval from the switching of the control signal of the solenoid valve 101 from energized to de-energized to the start of the increase of the output pressure C1 of the air-controlled switching valve 102; the air-charging time t4 of the air-controlled switching valve 102 is calculated based on the signal collected by the signal acquisition board 201, that is, the time interval from the switching of the control signal of the solenoid valve 101 from energized to de-energized to the rise of the output pressure C1 of the air-controlled switching valve 102 to the preset pressure (such as 90% of the starting pressure, C1). 90％ ) time interval.

[0060] After calculating the exhaust response time t1, exhaust time t2, charging response time t3 and charging time t4, the signal processing board 202 compares the exhaust response time t1, exhaust time t2, charging response time t3 and charging time t4 with their corresponding standard ranges to determine the current movement state of the air-controlled switching valve 102. When the exhaust response time t1, exhaust time t2, charging response time t3 and charging time t4 deviate from the standard range, it is determined that the movement state of the air-controlled switching valve 102 is abnormal.

[0061] Figure 3 is a schematic diagram of the structure of the gas-controlled switching valve 102 provided in one embodiment of the present application. Figure 3 As shown, the air-controlled switching valve 102 includes: a grease injection port 14;

[0062] When the motion state of the air-controlled switching valve 102 detected by the signal acquisition and processing device 105 is abnormal, the injection device injects grease through the grease injection port 14 to optimize the motion state of the air-controlled switching valve 102 .

[0063] Specifically, a grease injection port 14 is provided on the air-controlled switching valve 102 , and grease can be injected through the grease injection port 14 to adjust the operating state of the piston in the air-controlled switching valve 102 , thereby optimizing the switching of the state of the air-controlled switching valve 102 .

[0064] In one embodiment, if Figure 3 As shown, the grease injection port 14 is provided with a non-return one-way valve 13 for preventing the grease and the gas in the valve from flowing out of the air-controlled switching valve 102 .

[0065] Specifically, Figure 6The figure shows the structure of the non-return one-way valve 13 arranged at the grease injection port 14. The non-return one-way valve 13 includes a valve body 601, a rubber valve head 603 and a return spring 602. When the operator injects grease, the rubber valve head 603 opens the injection port under the squeezing of the injection head or other injection equipment, and the grease can flow from the grease injection port 14 through the channel to the lubrication point; when the grease is injected, the rubber valve head 603 blocks the injection port under the elastic force of the return spring 602 to prevent the grease and the gas in the valve from flowing out of the valve body.

[0066] In one embodiment, if Figure 3 As shown, the air-controlled switching valve 102 further includes: a piston 4, a piston sleeve 2, sealing rings 10-12 and lubrication points;

[0067] The piston sleeve 2 wraps the piston 4, the lubrication point is arranged on the inner wall of the piston sleeve 2, and the sealing rings 10-12 are arranged on the piston 4;

[0068] The lubrication point is connected to the grease injection port 14 via a channel, and the grease injected from the grease injection port 14 flows to the lubrication point through the channel to lubricate the sealing ring.

[0069] Specifically, the pneumatic switching valve 102 includes a main valve body 1, a return spring 3, a piston 4, a piston sleeve 2, sealing rings 10-12 and lubrication points. The sealing rings 10-12 are arranged on the piston 4, including O-rings 10-11 and a Y-ring 12. Figure 3 The air-controlled switching valve 102 shown is in a conducting state, at which time the pilot pressure T is equal to 0, and the piston 4 is located at the lower end under the action of the return spring 3. At this time, the air path holes C and C1 on the main valve body 1 and the piston sleeve 2 are located between the O-ring 10 and the O-ring 11, and the two are conducted, and the output pressure C1 is equal to the input pressure C.

[0070] In one embodiment, if Figure 3 As shown, the air-controlled switching valve 102 further includes O-rings 5 ​​to 9 arranged on the piston sleeve 2 , which can reduce wear and tear and extend the service life of the air-controlled switching valve 102 .

[0071] like Figure 4 The air-controlled switching valve 102 shown is in the exhaust state. At this time, the pilot pressure T is equal to the control pressure R. The pilot pressure T acts on the lower end of the piston 4, overcomes the elastic force of the return spring 3, and pushes the piston 4 to the upper end. At this time, the air path holes C and C1 on the main valve body 1 and the piston sleeve 2 are located on both sides of the O-ring 10, and the two are cut off. The output pressure C1 is exhausted to the atmosphere through the exhaust hole on the piston 4 and the exhaust hole O on the main valve body 1.

[0072] When the piston 4 moves under the action of the pilot pressure T or the return spring 3, the O-rings 10-11 move accordingly and generate friction resistance with the inner wall of the piston sleeve 2, thereby delaying the switching action. Although the Y-ring 12 also generates friction resistance, the O-ring, as an extrusion seal, has a much greater movement resistance than the Y-ring. Therefore, the movement resistance of the O-rings 10-11 is the main reason for the long switching time and poor movement state of the air-controlled switching valve 102. As the use time increases, the friction resistance of the O-ring movement becomes larger and larger, and the switching time of the air-controlled switching valve 102 will gradually increase, eventually causing a decrease in braking performance or even failure.

[0073] like Figure 5 As shown, lubrication points 15 are distributed on the piston sleeve 2 of the air-controlled switching valve 102, and the lubrication points 15 are connected to the grease injection port 14 on the main valve body 1. When the equipment maintenance personnel receive a signal from the signal acquisition and identification device indicating that the movement state of the air-controlled switching valve 102 is abnormal, grease can be injected into the inner surface of the piston sleeve 2 through the grease injection port 14 to improve the lubrication state of the O-ring, thereby reducing the switching time of the air-controlled switching valve 102. After the grease is injected, the conduction state of the air-controlled switching valve 102 can be switched several times, so that the piston 4 drives the O-rings 10-11 to move up and down. When the O-rings 10-11 pass through the lubrication points 15, the newly injected grease can be evenly applied to the inner wall of the piston sleeve 2.

[0074] In one embodiment, the number of the lubrication point 15 and the grease injection port 14 is at least one, and the number of the lubrication point 15 and the number of the grease injection port 14 are equal.

[0075] In one embodiment, the air-controlled switching valve motion state detection device further includes: an output device;

[0076] The output device is connected to the signal acquisition and processing device 105 and is used to output a warning signal when the motion state of the gas-controlled switching valve 102 detected by the signal acquisition and processing device 105 is abnormal.

[0077] Specifically, when the motion state of the air-controlled switching valve 102 detected by the signal acquisition and processing device 105 is abnormal, the abnormal signal is transmitted to the output device, so that the output device outputs a warning signal according to the abnormal signal.

[0078] In one embodiment, the output device includes at least one of a display, a speaker, and a buzzer.

[0079] In one embodiment, the signal acquisition and processing device 105 sends the detected motion state signal to the brake control device, so that the brake control device detects the motion state signal and outputs a warning signal when the motion state deviates from a normal range.

[0080] The present application provides a device for detecting the motion state of an air-controlled switching valve, which comprises an electromagnetic valve, an air-controlled switching valve, a first pressure sensor, a second pressure sensor and a signal acquisition and processing device; one end of the first pressure sensor is connected between the electromagnetic valve and the air-controlled switching valve, and is used to collect the pilot pressure output by the electromagnetic valve to the air-controlled switching valve under the action of the control pressure and convert it into a pilot pressure signal; one end of the second pressure sensor is connected to the air-controlled switching valve, and is used to collect the output pressure of the air-controlled switching valve and convert it into an output pressure signal; the signal acquisition and processing device is connected to the electromagnetic valve, the other end of the first pressure sensor and the other end of the second pressure sensor, and is used to collect the control signal of the electromagnetic valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor, and detects the motion state of the air-controlled switching valve according to the control signal, the pilot pressure signal and the output pressure signal, thereby realizing the detection, judgment and optimization of the switching action state of the air-controlled switching valve and the controlled pressure response state, greatly reducing the inspection and maintenance costs, improving the safety and reliability of the rail vehicle braking system, and ensuring the efficiency and economy of train operation.

[0081] Among them, the signal acquisition and processing equipment is used to collect the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor, and the output pressure signal of the second pressure sensor, so that the current operating status can be actively grasped in real time, without having to wait for the air-controlled switching valve to be repaired or even when a functional failure occurs during operation, and then passively know its operating status through disassembly inspection and other methods. In addition, through the grease injection port of the air-controlled switching valve, when the abnormal movement state of the air-controlled switching valve is detected and an early warning signal is received, the operator can improve the lubrication state of the air-controlled switching valve without disassembling it, and restore its low response time and high sensitivity.

[0082] In addition, the present application also provides a method for detecting the motion state of an air-controlled switching valve, which completes the detection of the motion state of an air-controlled switching valve by using the air-controlled switching valve motion state detection device described in the above embodiment.

[0083] Figure 8 FIG. 1 is a flow chart of a method for detecting the motion state of an air-controlled switching valve provided in an embodiment of the present application. Figure 8 As shown, the method for detecting the motion state of a gas-controlled switching valve provided in the present application includes:

[0084] S801: The first pressure sensor collects the pilot pressure output by the solenoid valve to the air-controlled switching valve under the control pressure and converts it into a pilot pressure signal;

[0085] S802: The second pressure sensor collects the output pressure of the air-controlled switching valve and converts it into an output pressure signal;

[0086] Specifically, the pilot pressure T is controlled by controlling the on-off of the solenoid valve through an electrical signal, so that the two-position three-way air-controlled switching valve can realize the switching action. When the solenoid valve loses power, the control pressure R is cut off, and the pilot pressure T is 0. At this time, the air-controlled switching valve is in the on state, and the input pressure C outputs the pressure C1 to the downstream; when the solenoid valve is energized, the control pressure R is turned on, and the pilot pressure T is equal to R. At this time, the air-controlled switching valve switches to the exhaust state, and while cutting off the input pressure C, the downstream pressure C1 is emptied to the atmosphere.

[0087] The first pressure sensor collects the pilot pressure T output by the solenoid valve to the air-controlled switching valve and converts it into a pilot pressure signal. The second pressure sensor collects the output pressure C1 of the air-controlled switching valve and converts it into an output pressure signal.

[0088] In one embodiment, the control pressure R and the input pressure C are maintained at predetermined pressure values.

[0089] S803: The signal acquisition and processing device acquires the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor, and the output pressure signal of the second pressure sensor, and detects the movement state of the air-controlled switching valve according to the control signal, the pilot pressure signal, and the output pressure signal.

[0090] Specifically, the signal acquisition device collects the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor, and processes the collected control signal, pilot pressure signal and output pressure signal to determine the movement state of the air-controlled switching valve.

[0091] Fig. 9 FIG. 1 is a flow chart of a method for detecting the motion state of an air-controlled switching valve provided in an embodiment of the present application. Fig. 9 As shown, S803 includes:

[0092] S901: The signal acquisition board collects the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor, and the output pressure signal of the second pressure sensor;

[0093] S902: The signal processing board determines the exhaust response time, exhaust time, charging response time and charging time according to the control signal, the pilot pressure signal and the output pressure signal;

[0094] Specifically, the signal acquisition board collects the control signal, pilot pressure signal and output pressure signal, and the signal processing board obtains the corresponding relationship of the solenoid valve control signal, pilot pressure T and output pressure C1 in time sequence from the signal collected by the signal acquisition board. Figure 7 The signal processing board analyzes the motion state of the air-controlled switching valve according to the corresponding relationship between the solenoid valve control signal, the pilot pressure T and the output pressure C1 in the timing sequence.

[0095] When the solenoid valve control signal is de-energized, the solenoid valve is in the cut-off position, the pilot pressure T is 0, the air-controlled switching valve is in the conduction position, and the output pressure C1 is equal to the input pressure C; when the solenoid valve control signal is switched from de-energized to energized, the solenoid valve is converted from the cut-off position to the conduction position, at which time the pilot pressure T begins to rise, and the air-controlled switching valve is switched from the conduction position to the exhaust position under the action of the pilot pressure T, and the output pressure C1 is gradually exhausted to 0. The signal processing board calculates the exhaust response time t1 of the air-controlled switching valve based on the signal collected by the signal acquisition board, that is, the time interval from the switching of the solenoid valve control signal to the start of the decrease in the output pressure C1 of the air-controlled switching valve; the exhaust time t2 of the air-controlled switching valve is calculated based on the signal collected by the signal acquisition board, that is, the time interval from the switching of the solenoid valve control signal to the start of the decrease in the output pressure C1 of the air-controlled switching valve. 10％ ) time interval.

[0096] When the solenoid valve control signal switches from energized to de-energized, the solenoid valve switches from the on position to the off position. At this time, the pilot pressure T gradually decreases to 0, the air-controlled switching valve switches from the exhaust position to the on position, and the output pressure C1 gradually increases from 0 to equal the input pressure C. The signal processing board calculates the air-charging response time t3 of the air-controlled switching valve based on the signal collected by the signal acquisition board, that is, the time interval from the switching of the solenoid valve control signal to the de-energization to the start of the rise of the output pressure C1 of the air-controlled switching valve; the air-charging time t4 of the air-controlled switching valve is calculated based on the signal collected by the signal acquisition board, that is, the time interval from the switching of the solenoid valve control signal to the de-energization to the filling of the output pressure C1 of the air-controlled switching valve to a certain set pressure (such as 90% of the starting pressure, C 90％ ) time interval.

[0097] S903: The signal processing board determines the motion state of the air-controlled switching valve according to the exhaust response time, the exhaust time, the charging response time and the charging time.

[0098] Specifically, after calculating the exhaust response time t1, exhaust time t2, charging response time t3 and charging time t4, the signal processing board compares the exhaust response time t1, exhaust time t2, charging response time t3 and charging time t4 with their corresponding standard ranges to determine the current movement state of the air-controlled switching valve. When the exhaust response time t1, exhaust time t2, charging response time t3 and charging time t4 deviate from the standard range, it is determined that the movement state of the air-controlled switching valve is abnormal.

[0099] In one embodiment, the method for detecting the motion state of a gas-controlled switching valve provided by the present application further includes:

[0100] When the movement state of the gas-controlled switching valve detected by the signal acquisition and processing device is abnormal, an output device connected to the signal acquisition and processing device outputs a warning signal.

[0101] Specifically, when the motion state of the air-controlled switching valve detected by the signal acquisition and processing device is abnormal, the abnormal signal is transmitted to the output device, so that the output device outputs a warning signal according to the abnormal signal.

[0102] In one embodiment, the output device includes at least one of a display, a speaker, and a buzzer.

[0103] In one embodiment, the signal acquisition and processing device sends the detected motion state signal to the brake control device, so that the brake control device detects the motion state signal and outputs a warning signal when the motion state deviates from a normal range.

[0104] In one embodiment, the method for detecting the motion state of a gas-controlled switching valve provided by the present application further includes:

[0105] When the motion state of the air-controlled switching valve detected by the signal acquisition and processing device is abnormal, the injection device injects grease through the grease injection port of the air-controlled switching valve to optimize the motion state of the air-controlled switching valve.

[0106] Specifically, a grease injection port is provided on the air-controlled switching valve, and grease can be injected through the grease injection port to adjust the operating state of the piston in the air-controlled switching valve, thereby optimizing the switching of the state of the air-controlled switching valve.

[0107] The present application provides a method for detecting the movement state of an air-controlled switching valve, wherein the first pressure sensor collects the pilot pressure output to the air-controlled switching valve by the solenoid valve under the action of the control pressure and converts it into a pilot pressure signal; the second pressure sensor collects the output pressure of the air-controlled switching valve and converts it into an output pressure signal; the signal acquisition and processing equipment collects the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor, and detects the movement state of the air-controlled switching valve according to the control signal, the pilot pressure signal and the output pressure signal, thereby realizing the detection, judgment and optimization of the switching action state and the controlled pressure response state of the air-controlled switching valve, greatly reducing the inspection and maintenance costs, improving the safety and reliability of the rail vehicle braking system, and ensuring the efficiency and economy of train operation.

[0108] Among them, by collecting the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor through the signal acquisition and processing equipment, the current operating status can be actively grasped in real time, without having to wait for the air-controlled switching valve to be repaired or even when a functional failure occurs during operation, and then passively knowing its operating status through disassembly inspection and other methods. In addition, through the grease injection port of the air-controlled switching valve, when the abnormal movement state of the air-controlled switching valve is detected and an early warning signal is received, the operator can improve the lubrication state of the air-controlled switching valve without disassembling it, and restore its low response time and high sensitivity.

[0109] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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. In addition, the terms "first", "second", etc. are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0110] The descriptions with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The order of steps involved in each embodiment is used to schematically illustrate the implementation of the present application, and the order of steps therein is not limited and may be appropriately adjusted as needed.

[0111] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0112] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A device for detecting the motion state of a gas-controlled switching valve, characterized in that: include: Solenoid valve, air-controlled switching valve, first pressure sensor, second pressure sensor and signal acquisition and processing equipment; One end of the first pressure sensor is connected between the solenoid valve and the air-controlled switching valve, and is used to collect the pilot pressure output by the solenoid valve to the air-controlled switching valve under the control pressure and convert it into a pilot pressure signal; One end of the second pressure sensor is connected to the air-controlled switching valve, and is used to collect the output pressure of the air-controlled switching valve and convert it into an output pressure signal; The signal acquisition and processing device is connected to the solenoid valve, the other end of the first pressure sensor and the other end of the second pressure sensor, and is used to collect the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor, and detect the movement state of the air-controlled switching valve according to the control signal, the pilot pressure signal and the output pressure signal.

2. The device for detecting the motion state of a gas-controlled switching valve according to claim 1, characterized in that: The air-controlled switching valve comprises: a grease injection port; When the motion state of the air-controlled switching valve detected by the signal acquisition and processing device is abnormal, the injection device injects grease through the grease injection port to optimize the motion state of the air-controlled switching valve.

3. The device for detecting the motion state of a gas-controlled switching valve according to claim 2, characterized in that: The air-controlled switching valve also includes: a piston, a piston sleeve, a sealing ring and a lubrication point; The piston sleeve wraps the piston, the lubrication point is arranged on the inner wall of the piston sleeve, and the sealing ring is arranged on the piston; The lubrication point is connected to the grease injection port through a channel, and the grease injected from the grease injection port flows to the lubrication point through the channel to lubricate the sealing ring.

4. The device for detecting the motion state of a gas-controlled switching valve according to claim 2, characterized in that: The grease injection port is provided with a non-return one-way valve for preventing the grease and the gas in the valve from flowing out of the air-controlled switching valve.

5. The device for detecting the motion state of a gas-controlled switching valve according to claim 1, characterized in that: Also includes: Output devices; The output device is connected to the signal acquisition and processing device, and is used to output a warning signal when the motion state of the air-controlled switching valve detected by the signal acquisition and processing device is abnormal.

6. The device for detecting the motion state of a gas-controlled switching valve according to claim 1, characterized in that: The signal acquisition and processing equipment comprises: A signal acquisition board, used for acquiring the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor; A signal processing board is used to determine the exhaust response time, exhaust time, charging response time and charging time according to the control signal, the pilot pressure signal and the output pressure signal; and to determine the movement state of the air-controlled switching valve according to the exhaust response time, the exhaust time, the charging response time and the charging time.

7. A method for detecting the motion state of an air-controlled switching valve, applied to the device for detecting the motion state of an air-controlled switching valve according to any one of claims 1 to 6, characterized in that: include: The first pressure sensor collects the pilot pressure output by the solenoid valve to the air-controlled switching valve under the control pressure and converts it into a pilot pressure signal; The second pressure sensor collects the output pressure of the air-controlled switching valve and converts it into an output pressure signal; The signal acquisition and processing device acquires the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor, and detects the movement state of the air-controlled switching valve according to the control signal, the pilot pressure signal and the output pressure signal.

8. The method for detecting the motion state of an air-controlled switching valve according to claim 7, characterized in that: The signal acquisition and processing device includes a signal acquisition board and a signal processing board; the signal acquisition and processing device acquires the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor, and the output pressure signal of the second pressure sensor, and detects the motion state of the air-controlled switching valve according to the control signal, the pilot pressure signal, and the output pressure signal, including: The signal acquisition board collects the control signal of the solenoid valve, the pilot pressure signal of the first pressure sensor and the output pressure signal of the second pressure sensor; The signal processing board determines the exhaust response time, exhaust time, charging response time and charging time according to the control signal, the pilot pressure signal and the output pressure signal; The signal processing board determines the motion state of the air-controlled switching valve according to the exhaust response time, the exhaust time, the charging response time and the charging time.

9. The method for detecting the motion state of an air-controlled switching valve according to claim 7, characterized in that: Also includes: When the movement state of the gas-controlled switching valve detected by the signal acquisition and processing device is abnormal, an output device connected to the signal acquisition and processing device outputs a warning signal.

10. The method for detecting the motion state of an air-controlled switching valve according to claim 7, characterized in that: Also includes: When the motion state of the air-controlled switching valve detected by the signal acquisition and processing device is abnormal, the injection device injects grease through the grease injection port of the air-controlled switching valve to optimize the motion state of the air-controlled switching valve.

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