A hydraulic flushing device suitable for rail vehicle braking system

Abstract

The present invention discloses a hydraulic flushing device suitable for rail vehicle brake systems, comprising a hydraulic oil tank, a brake unit, a control unit, a low-pressure pump, a high-pressure pump, and a particle sensor. The hydraulic flushing device includes at least a first operating state, a second operating state, a third operating state, and a fourth operating state, and can switch between the first, second, third, and fourth operating states under the control of the control unit. This hydraulic flushing device suitable for rail vehicle brake systems can clean, flush, and maintain pressure in the entire rail vehicle's hydraulic brake system, resolving the prior art issues of unintelligent cleaning and inspection after assembly of the vehicle's brake system components, as well as discontinuous flushing and pressure-maintaining operations.

Description

Technical Field

[0001] The invention relates to a hydraulic flushing device suitable for a rail vehicle brake system, belonging to the technical field of rail transportation. Background Art

[0002] The various components of a rail vehicle's hydraulic brake system are connected in series via pipelines. The system's tightness and cleanliness directly impact the vehicle's operating status. Blockages or leaks in the brake system can prevent braking commands from reaching the terminal device, causing brake failure and impacting vehicle braking performance. Rail vehicle hydraulic brake systems are typically cleaned using cleaning bombs and high-pressure air before pipeline installation. After vehicle assembly, oil flushing is performed. Tightness is primarily checked by injecting high-pressure oil into the brake system for a pressure-maintaining test.

[0003] Currently, hydraulic brake system cleanliness checks typically involve checking the oil quality at the oil outlet during the oil filling and cleaning process. Checking the system's tightness requires injecting clean hydraulic oil into the brake system for a pressure test to verify the system's tightness. Substandard oil filling results in contamination of the brake system, requiring re-cleaning. Therefore, these checks for the cleanliness and tightness of rail vehicle hydraulic brake systems typically require distributed testing, preventing automated testing.

[0004] It can be seen that in order to apply the automatic cleaning, flushing and pressure maintaining functions of the hydraulic brake system of rail vehicles, a hydraulic flushing device suitable for the brake system of rail vehicles is urgently needed. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a hydraulic flushing device suitable for the braking system of a rail vehicle, which can realize the cleaning, flushing and pressure-maintaining functions of the entire oil pressure braking system of the rail vehicle, and solve the problems of unintelligent cleaning and inspection after the assembly of the entire vehicle braking system components and discontinuous flushing and pressure-maintaining operations in the prior art.

[0006] In order to achieve the above objectives / solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0007] A hydraulic flushing device for a rail vehicle brake system includes a hydraulic oil tank, a brake unit, a control unit, a low-pressure pump, a high-pressure pump, and a particle sensor, wherein:

[0008] The hydraulic flushing device includes at least a first working state, a second working state, a third working state and a fourth working state, and can be switched among the first working state, the second working state, the third working state and the fourth working state according to the control of the control unit;

[0009] When the hydraulic flushing device is switched to the first working state, the hydraulic oil is pumped to the brake unit by the low-pressure pump and returned to the hydraulic oil tank to flush the brake unit, and the particle sensor is used to monitor the contamination level of the hydraulic oil after flowing through the brake unit;

[0010] When the hydraulic flushing device is switched to the second working state, the hydraulic oil is pumped to the brake unit through the low-pressure pump for variable frequency emptying;

[0011] When the hydraulic flushing device is switched to the third working state, the hydraulic oil is pumped to the brake unit by the high-pressure pump for high-pressure discharge;

[0012] When the hydraulic flushing device is switched to the fourth working state, the hydraulic oil is pumped to the closed oil circuit by the high-pressure pump for an oil pressure test. After the test is passed, the oil circuit is opened and the hydraulic oil returns to the hydraulic oil tank.

[0013] Furthermore, it also includes a plurality of solenoid valves, which are used to receive electrical signals sent by the control unit to drive the hydraulic flushing device to switch between the first working state, the second working state, the third working state and the fourth working state.

[0014] Further,

[0015] It also includes a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a third pressure-limiting valve, a node C, a node D and a node K, wherein the P port of the second solenoid valve is connected to the A port of the third solenoid valve, the A port of the second solenoid valve is connected to the P port of the fourth solenoid valve, and the A port of the fourth solenoid valve is connected to the P port of the seventh solenoid valve. The node C is located at the intersection of the oil circuits of the T port of the seventh solenoid valve and the T port of the eighth solenoid valve, the node K is located at the intersection of the oil circuits of the T port of the seventh solenoid valve and the A port of the eighth solenoid valve, the node D is located at the intersection of the oil circuit formed by the hydraulic oil tank return port and the P port of the third solenoid valve and the oil circuit formed by the node K and the hydraulic oil tank return port, and the third pressure-limiting valve is located between the node C and the node K;

[0016] When the hydraulic flushing device switches to the first working state,

[0017] After being pumped by the low-pressure pump, the hydraulic oil flows back to the hydraulic oil tank through the third solenoid valve, the second solenoid valve, the fourth solenoid valve, the brake unit, the seventh solenoid valve, the node C, and the third pressure-limiting valve. Part of the hydraulic oil is diverted before the node C and flows back to the hydraulic oil tank through the eighth solenoid valve, the particle sensor, the node K, and the node D.

[0018] Furthermore, when the hydraulic flushing device switches to the second working state,

[0019] The hydraulic oil is pumped by the low-pressure pump and flows back to the hydraulic oil tank through the third solenoid valve, the second solenoid valve, the fourth solenoid valve, the brake unit, the seventh solenoid valve, and the node D;

[0020] Frequency conversion emptying includes low-pressure emptying and high-pressure emptying. After each low-pressure emptying and high-pressure emptying, the hydraulic oil is pumped by the low-pressure pump and then flows back to the hydraulic oil tank through the third solenoid valve, node D, and the first filter.

[0021] Furthermore, it also includes a fifth solenoid valve and a second filter. When the hydraulic flushing device switches to the third working state,

[0022] The hydraulic oil is pumped by the high-pressure pump and flows back to the hydraulic oil tank through the second filter, the fifth solenoid valve, the second solenoid valve, the fourth solenoid valve, the brake unit, the seventh solenoid valve, the node K, and the first filter;

[0023] After each high-pressure discharge, the hydraulic oil is pumped by the high-pressure pump and then flows back to the hydraulic oil tank through the second filter, the fifth solenoid valve and the first filter.

[0024] Furthermore, it also includes a first solenoid valve, a sixth solenoid valve and a pressure sensor. When the hydraulic flushing device is switched to the fourth working state,

[0025] A closed oil circuit is formed between the first solenoid valve and the sixth solenoid valve, and the pressure sensor records the pressure of the closed oil circuit.

[0026] Furthermore, it also includes a first throttle valve, which is installed between the first solenoid valve and the sixth solenoid valve.

[0027] Furthermore, it also includes an accumulator, which is connected to the first solenoid valve. When the accumulator accumulates pressure, the hydraulic oil is pumped by the high-pressure pump and then delivered to the accumulator through the first solenoid valve.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] Ability to automatically check the oil port quality during the cleaning process through particle sensors and detect whether the vehicle brake system is flushed clean;

[0030] The PLC device controls the conduction and closing of the solenoid valve to control the internal circuit of the device, thereby realizing the cleaning, flushing and pressure maintaining functions of the device;

[0031] Through the control panel on the integrated trolley, the device parameters are set, the hydraulic flushing device is operated, and the progress of the device is displayed;

[0032] The device interface adopts a quick-connect connector style, which can be quickly and multiple times connected to the vehicle pipeline. The oil inlet and return pipes at the interface are transparent plastic pipes, and the oil quality can be visually observed through the plastic pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a system principle diagram of a hydraulic flushing device suitable for a rail vehicle brake system. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0035] In the description of the present invention, 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances. Example 1

[0037] This embodiment provides a hydraulic flushing device for a rail vehicle brake system, comprising a hydraulic oil tank, a brake unit, a control unit, a low-pressure pump, a high-pressure pump, and a particle sensor, wherein:

[0038] The hydraulic flushing device includes at least a first working state, a second working state, a third working state and a fourth working state, and can be switched among the first working state, the second working state, the third working state and the fourth working state according to the control of the control unit;

[0039] When the hydraulic flushing device is switched to the first working state, the hydraulic oil is pumped to the brake unit by the low-pressure pump and returned to the hydraulic oil tank to flush the brake unit, and the particle sensor is used to monitor the contamination level of the hydraulic oil after flowing through the brake unit;

[0040] When the hydraulic flushing device is switched to the second working state, the hydraulic oil is pumped to the brake unit through the low-pressure pump for variable frequency emptying;

[0041] When the hydraulic flushing device is switched to the third working state, the hydraulic oil is pumped to the brake unit by the high-pressure pump for high-pressure discharge;

[0042] When the hydraulic flushing device is switched to the fourth working state, the hydraulic oil is pumped to the closed oil circuit by the high-pressure pump for an oil pressure test. After the test is passed, the oil circuit is opened and the hydraulic oil returns to the hydraulic oil tank.

[0043] The high-pressure oil pump is used for the high-pressure circuit of the system, with an operating pressure and flow rate of 160 bar and 3 L / min respectively. The low-pressure oil pump is used for the low-pressure circuit, with an operating pressure and flow rate of 10-50 bar (frequency control) and 16 L / min respectively.

[0044] The control unit utilizes the characteristics of the solenoid valve being energized and closed when de-energized, and controls the solenoid valve in the hydraulic brake unit to gain and lose power and to open and close its internal branch oil circuits through the PLC, and cooperates with the pipeline flushing trolley to realize the functions of detecting the cleanliness of the hydraulic oil in the oil tank in the target area of ​​the hydraulic flushing device, emptying the brake system pipeline, filling the brake system with hydraulic oil, performing the brake system oil pressure test, relieving the brake system oil pressure test, flushing the brake system pipeline, and heating the oil tank hydraulic oil. Example 2

[0045] The hydraulic flushing device for a rail vehicle brake system provided in this embodiment differs from the hydraulic flushing device for a rail vehicle brake system provided in the first embodiment in that:

[0046] Furthermore, it also includes a plurality of solenoid valves, which are used to receive electrical signals sent by the control unit to drive the hydraulic flushing device to switch between the first working state, the second working state, the third working state and the fourth working state.

[0047] Further,

[0048] It also includes a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a third pressure-limiting valve, a node C, a node D and a node K, wherein the P port of the second solenoid valve is connected to the A port of the third solenoid valve, the A port of the second solenoid valve is connected to the P port of the fourth solenoid valve, and the A port of the fourth solenoid valve is connected to the P port of the seventh solenoid valve. The node C is located at the intersection of the oil circuits of the T port of the seventh solenoid valve and the T port of the eighth solenoid valve, the node K is located at the intersection of the oil circuits of the T port of the seventh solenoid valve and the A port of the eighth solenoid valve, the node D is located at the intersection of the oil circuit formed by the hydraulic oil tank return port and the P port of the third solenoid valve and the oil circuit formed by the node K and the hydraulic oil tank return port, and the third pressure-limiting valve is located between the node C and the node K;

[0049] When the hydraulic flushing device switches to the first working state,

[0050] After being pumped by the low-pressure pump, the hydraulic oil flows back to the hydraulic oil tank through the third solenoid valve, the second solenoid valve, the fourth solenoid valve, the brake unit, the seventh solenoid valve, the node C, and the third pressure-limiting valve. Part of the hydraulic oil is diverted before the node C and flows back to the hydraulic oil tank through the eighth solenoid valve, the particle sensor, the node K, and the node D.

[0051] Furthermore, when the hydraulic flushing device switches to the second working state,

[0052] The hydraulic oil is pumped by the low-pressure pump and flows back to the hydraulic oil tank through the third solenoid valve, the second solenoid valve, the fourth solenoid valve, the brake unit, the seventh solenoid valve, and the node D;

[0053] Frequency conversion emptying includes low-pressure emptying and high-pressure emptying. After each low-pressure emptying and high-pressure emptying, the hydraulic oil is pumped by the low-pressure pump and then flows back to the hydraulic oil tank through the third solenoid valve, node D, and the first filter.

[0054] Furthermore, it also includes a fifth solenoid valve and a second filter. When the hydraulic flushing device switches to the third working state,

[0055] The hydraulic oil is pumped by the high-pressure pump and flows back to the hydraulic oil tank through the second filter, the fifth solenoid valve, the second solenoid valve, the fourth solenoid valve, the brake unit, the seventh solenoid valve, the node K, and the first filter;

[0056] After each high-pressure discharge, the hydraulic oil is pumped by the high-pressure pump and then flows back to the hydraulic oil tank through the second filter, the fifth solenoid valve and the first filter.

[0057] Furthermore, it also includes a first solenoid valve, a sixth solenoid valve and a pressure sensor. When the hydraulic flushing device is switched to the fourth working state,

[0058] A closed oil circuit is formed between the first solenoid valve and the sixth solenoid valve, and the pressure sensor records the pressure of the closed oil circuit.

[0059] Furthermore, it also includes a first throttle valve, which is installed between the first solenoid valve and the sixth solenoid valve.

[0060] Furthermore, it also includes an accumulator, which is connected to the first solenoid valve. When the accumulator accumulates pressure, the hydraulic oil is pumped by the high-pressure pump and then delivered to the accumulator through the first solenoid valve.

[0061] The first filter Figure 1 The corresponding filter is filter 3, and the second filter is Figure 1 The corresponding filter is filter 2.

[0062] The following is the state of the device when each function is used in combination with the device principle ( Figure 1 ) Further description of the components of the device:

[0063] Function 1: P1 pump tank oil detection Working principle: P1 pump, F3 and F8 solenoid valves are energized.

[0064] After the hydraulic oil pumped out by pump P1 reaches node N, most of the hydraulic oil flows back to the oil tank through pressure-limiting valve 4, node D, and filter 3. A small amount of hydraulic oil flows directly back to the oil tank through the valve particle sensor, node D, and filter 3. It is monitored by the particle sensor until the oil sample in the tank meets the contamination level (NAS) requirements.

[0065] Function 2: P1 pump variable frequency emptying working principle: P1 pump, F2, F3, F4, F7 solenoid valves are energized.

[0066] Stop valve 1, stop valve 2, and stop valve 3 are all in the open state, ball valves F4 and F7 are energized to the right position (open state), and the hydraulic oil returns to the oil tank through valves F3, F2, ball valve F4, brake system, ball valve F7, node D, and filter 3.

[0067] During the bleeding process, the hydraulic system circulation equipment bleeds the brake system according to the following procedures:

[0068] (1) The working pressure of the P1 pump is frequency-converted to the set low pressure

[0069] (2) Under the set emptying low pressure and low pressure emptying running time conditions, complete a low pressure emptying of the brake system.

[0070] (3) After each low-pressure discharge, valve F3 is energized to the left position, and the hydraulic oil pumped out by oil pump P1 returns to the oil tank through valve F3, node D, and filter 3, so that the air in the brake system gathers into large bubbles or dissolves into smaller bubbles.

[0071] (4) After the set low-pressure emptying stop time, repeat (2) and (3).

[0072] (5) Complete the low-pressure emptying of the brake system according to the set low-pressure emptying times.

[0073] (6) The working pressure of the P1 pump is frequency-converted to the set high pressure.

[0074] (7) Under the set high pressure emptying and high pressure emptying running time conditions, complete a high pressure emptying of the brake system.

[0075] (8) After each high-pressure discharge, valve F3 is energized to the left position, and the hydraulic oil pumped out by oil pump P1 returns to the oil tank through valve F3, node D, and filter 3, so that it can be dissolved into smaller bubbles in the brake system.

[0076] (9) After the set high pressure discharge space stop time, repeat 7 and 8

[0077] (10) Complete the high-pressure emptying of the brake system according to the set high-pressure emptying times

[0078] Function 3: P2 pump high pressure emptying Working principle: P2 pump, F2, F4 solenoid valves are energized

[0079] Stop valve 1, stop valve 2, and stop valve 3 are all in the open state, ball valves F4 and F7 are energized to the right position (open state), and the hydraulic oil returns to the oil tank through filter 2, valves F5, F2, ball valve F4, brake system, ball valve F7, node K, and filter 3.

[0080] During the emptying process, the hydraulic system circulation equipment empties the brake system according to the following procedures

[0081] (1) Under the conditions of set working pressure and emptying operation time, complete a high-pressure emptying of the brake system.

[0082] (2) After each draining, valve F5 is energized to the right position, and the hydraulic oil pumped out by oil pump P2 returns to the oil tank through filter 2, valve F5, and filter 3, so that it can be dissolved into smaller bubbles in the brake system.

[0083] (3) Complete the high-pressure emptying of the brake system according to the set emptying times.

[0084] Function 4: P2 pump oil pressure test Working principle: F6 is energized, F4 and F7 are de-energized

[0085] (1) Ball valves F4 and F7 are both de-energized to the left position (off state), and valve F6 is energized to the left position (open state)

[0086] (2) When valve F6 is energized to the left position (open state), the high-pressure oil between valve F1 and valve F6 pipeline is released.

[0087] (3) When the set pressure holding end time is reached, the oil pressure test is judged to be qualified based on the difference between the final pressure and the initial pressure and the preset pressure.

[0088] (4) Throttle valve 1 is set to prevent the generation of "shock waves" when high-pressure oil is released

[0089] (5) During the oil pressure test, pressure sensor Y1 = 0 and pressure sensor Y2 records the test pressure.

[0090] Function 5: Pressure relief after oil pressure test Working principle: F4 and F6 are energized

[0091] (1) Both stop valve 1 and stop valve 2 are in the open state

[0092] (2) The high-pressure hydraulic oil in the brake system flows back to the tank through the ball valve F4 (energized to the right position open state), F2, throttle valve 1, F6 (energized to the left position open state), and filter 3 to relieve the pressure of the system.

[0093] (3) Throttle valve 1 is set to prevent the generation of "shock waves" when high-pressure oil is released

[0094] Function 6: P1 pump flushing (cleanliness is not monitored) Working principle: P1 pump, F2, F3, F4, F7 are energized

[0095] (1) Stop valve 1, stop valve 2, and stop valve 3 are all in the open state, and ball valves F4 and F7 are energized to the right position (open state)

[0096] (2) The hydraulic oil returns to the oil tank through valves F3, F2, ball valve F4, brake system, ball valve F7, node D, and filter 3 to perform preliminary flushing of the system.

[0097] Function 7: P1 pump flushing (monitoring cleanliness) Working principle: P1 pump, F2, F3, F4, F7, F8 are energized

[0098] (1) Stop valve 1, stop valve 2, and stop valve 3 are all in the open state

[0099] (2) Valves F3, F2, ball valve F4, and ball valve F7 are all energized to the on state, and valve F8 is energized in the right position

[0100] (3) Flushing circuit: The hydraulic oil pumped out by pump P1 returns to the oil tank through valves F3, F2, ball valve F4, brake system, ball valve F7, node C, pressure limiting valve 3, and filter 3.

[0101] (4) Monitoring circuit: Due to the throttling effect of the pressure limiting valve 3, the hydraulic oil is diverted before the node C. A small amount of hydraulic oil flows directly back to the oil tank through the right position of valve F8, the particle sensor, node D, node K, and filter 3. The monitoring is implemented by the particle sensor until the oil sample in the tank meets the contamination level (NAS) requirement.

[0102] Function 8: P2 pump surge flushing working principle:

[0103] The hydraulic oil cycle during the P2 pump surge flushing process includes three hydraulic oil cycles: accumulator pressure accumulation (P2 pump, F1, F2, F4, and F7 are energized), accumulator oil discharge after pressure accumulation (F1, F4, F5, and F6 are energized, and F7 is de-energized), and accumulator pressure release (surge flushing F1 and F7 are alternately energized and de-energized).

[0104] (1) Accumulator pressure storage: After the P2 pump and valve F1 are energized, the hydraulic oil is pumped to the accumulator.

[0105] (2) Oil leakage after accumulator pressure accumulation: When the set accumulator pressure accumulation time is reached or the hydraulic oil in the accumulator reaches the working pressure of the P2 pump, the pressure sensor Y1 controls the valve F5 to the right position, so that the hydraulic oil pumped out by the P2 pump flows back to the oil tank through the node H, node D and filter 3.

[0106] (3) Surge flushing: Pressure sensor Y1 controls valves F1 and F2 to be energized alternately to achieve surge flushing

[0107] (4) During the surge flushing process, the pressure sensor Y1 always detects the hydraulic oil pressure in the accumulator.

[0108] (5) When the hydraulic oil pressure drops to the set accumulator pressure lower limit, valve F5 loses power to the left position and repeats the accumulator pressure accumulation process.

[0109] (6) After the set surge flushing is completed, valves F1, F4, F5, and F6 are energized (F7 is de-energized), and the high-pressure hydraulic oil in the accumulator and pipeline returns to the oil tank through throttle valve 1, F6, and filter 3.

[0110] Function 9: Heating the hydraulic oil in the oil tank Working principle: P1 pump and PTC heater are powered

[0111] (1) After the equipment is powered on, the temperature sensor T1 always monitors the hydraulic oil temperature. When the hydraulic oil temperature is lower than 5℃ or higher than 60℃, the equipment will automatically shut down and an alarm message will appear on the touch screen of the control panel.

[0112] (2) When the PTC heater is powered, the P1 pump works and the hydraulic oil returns to the tank through filter 1, valve F3 and filter 3.

[0113] (3) When the hydraulic oil is heated to the "stop heating temperature", the temperature sensor T1 controls the P1 pump to stop working, and the program returns to the previous interface.

[0114] (4) The level and temperature gauge on the control panel displays the hydraulic oil level and temperature Example 3

[0115] The hydraulic flushing device for a rail vehicle brake system provided in this embodiment differs from the hydraulic flushing device for a rail vehicle brake system provided in the first embodiment in that:

[0116] It also includes a pipeline flushing trolley and supporting oil inlet and return pipelines for the hydraulic brake unit control equipment. The hydraulic brake unit control equipment is integrated on the pipeline flushing trolley, and the port adopts a quick-plug connector style.

[0117] Optionally, the pipeline flushing trolley is in the form of a mobile trolley with a handle on the side and 4 sets of movable wheels at the bottom, 2 sets of which are directional wheels and 2 sets of which are universal wheels with braking function. An oil tank is provided at the bottom for storing and collecting hydraulic oil.

[0118] Optionally, a control panel is provided on the upper portion of the pipeline flushing trolley for operating the hydraulic flushing device and displaying the hydraulic flushing device interface.

[0119] The control panel includes: a touch screen, an oil pump switch, a particle sensor display, a pressure sensor display, and a start-stop switch, which are used to set the device working parameters and display the device status and progress.

[0120] Furthermore, the hydraulic brake unit control equipment includes: high and low pressure oil pumps, solenoid valves, a control unit, a pressure reducing valve, a filter, a particle sensor, a pressure sensor, and a pressure gauge. The above components are integrated on a pipeline flushing trolley, connected in series through pipelines, and the ports adopt a quick-plug connector style.

[0121] Furthermore, the high-pressure oil pump is used in the high-pressure circuit of the system, with a working pressure and flow rate of 160 bar and 3 L / min respectively; the low-pressure oil pump is used in the low-pressure circuit, with a working pressure and flow rate of 10-50 bar (frequency conversion control) and 16 L / min respectively.

[0122] Furthermore, the control unit utilizes the characteristics of the solenoid valve being energized and turned on, and de-energized and closed, to control the solenoid valve in the hydraulic brake unit through PLC to gain and lose power, and open and close its internal branch oil circuits, and cooperates with the pipeline flushing trolley to realize the functions of the hydraulic flushing device to detect the cleanliness of the hydraulic oil in the oil tank in the target area, empty the brake system pipeline, fill the brake system with hydraulic oil, perform brake system oil pressure test, relieve the brake system oil pressure test, flush the brake system pipeline, and heat the tank hydraulic oil.

[0123] Furthermore, the particle sensor has operating parameters of: pressure 0.3-4 MPa, flow rate 50-300 ml / min. It is used to monitor the cleanliness accuracy of the hydraulic oil in the tank and determine whether the cleanliness level of the hydraulic oil in the tank meets the requirements based on the set contamination level (NAS).

[0124] Furthermore, the pressure reducing valve is arranged in parallel with the particle sensor, and the working pressure is less than 4 MPa, so as to ensure that the particle sensor works normally and is not damaged.

[0125] Furthermore, the cleanliness level of the hydraulic oil in the tank is tested by pumping out the hydraulic oil through the P1 pump, and most of the hydraulic oil flows back to the tank through the pressure limiting valve and the filter; a small amount of hydraulic oil flows directly back to the tank through the valve particle sensor and the filter. During the tank oil testing process, the particle sensor always monitors the cleanliness accuracy of the hydraulic oil in the tank, and determines whether the cleanliness level of the hydraulic oil in the tank meets the requirements based on the set contamination level (NAS).

[0126] Furthermore, the brake system pipeline evacuation, i.e., the removal of air bubbles from the oil system, includes variable frequency evacuation and high-pressure evacuation. An oil pump is used to disperse the bubbles contained in the oil system to extremely small bubbles, which are then dissipated as the oil circulates. The P1 pump performs variable frequency evacuation, while the P2 pump performs high-pressure evacuation. The completion of evacuation is determined by observing the presence of bubbles in the transparent oil return tube.

[0127] Furthermore, in the brake system oil pressure test, after the hydraulic flushing device is connected to the vehicle brake system pipeline, high-pressure oil is injected into the vehicle through the high-pressure oil pump P2, and then the solenoid valve is closed to form a sealed system. The PLC automatically times and calculates the difference between the oil pressure at the time of injection and the oil pressure at the end to determine whether the oil pressure test is qualified. After the test is qualified, the solenoid valve is turned on, and the high-pressure oil is returned to the oil tank after decompression.

[0128] Furthermore, for the brake system pipeline flushing, the hydraulic flushing device is connected to the vehicle brake system to form a loop, and oil is injected into the vehicle pipeline system for flushing through the oil pump. The process is controlled by the PLC device, and the particle sensor is used to determine the contamination level (NAS) of the hydraulic oil flowing through it, and the process stops when the requirements are met.

[0129] Furthermore, the matching oil inlet and return pipes are transparent plastic pipes, and the ports are in the form of quick-connect connectors for quick connection to the vehicle's hydraulic brake lines.

[0130] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hydraulic flushing device for a rail vehicle brake system, characterized in that: It includes a hydraulic oil tank, a brake unit, a control unit, a low-pressure pump, a high-pressure pump and a particle sensor, among which, The hydraulic flushing device includes at least a first working state, a second working state, a third working state and a fourth working state, and can be switched among the first working state, the second working state, the third working state and the fourth working state according to the control of the control unit; When the hydraulic flushing device is switched to the first working state, the hydraulic oil is pumped to the brake unit by the low-pressure pump and returned to the hydraulic oil tank to flush the brake unit. The particle sensor is connected to the brake unit and is used to monitor the contamination level of the hydraulic oil after flowing through the brake unit. The particle sensor collects information on the number of hydraulic oil particles flowing through the brake unit and transmits it to the control unit. The control unit compares the hydraulic oil particle number information counted by the particle sensor with a preset value to determine whether the oil is clean and the contamination level. When the hydraulic flushing device is switched to the second working state, the hydraulic oil is pumped to the brake unit through the low-pressure pump for variable frequency emptying; When the hydraulic flushing device is switched to the third working state, the hydraulic oil is pumped to the brake unit by the high-pressure pump for high-pressure discharge; When the hydraulic flushing device is switched to the fourth working state, the hydraulic oil is pumped to the closed oil circuit by the high-pressure pump for an oil pressure test. After the test is passed, the oil circuit is opened and the hydraulic oil returns to the hydraulic oil tank; It also includes a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a seventh solenoid valve, an eighth solenoid valve, a third pressure-limiting valve, a node C, a node D and a node K, wherein the P port of the second solenoid valve is connected to the A port of the third solenoid valve, the A port of the second solenoid valve is connected to the P port of the fourth solenoid valve, and the A port of the fourth solenoid valve is connected to the P port of the seventh solenoid valve. The node C is located at the intersection of the oil circuits of the T port of the seventh solenoid valve and the T port of the eighth solenoid valve, the node K is located at the intersection of the oil circuits of the T port of the seventh solenoid valve and the A port of the eighth solenoid valve, the node D is located at the intersection of the oil circuit formed by the hydraulic oil tank return port and the P port of the third solenoid valve and the oil circuit formed by the node K and the hydraulic oil tank return port, and the third pressure-limiting valve is located between the node C and the node K; When the hydraulic flushing device switches to the first working state, After being pumped by the low-pressure pump, the hydraulic oil flows back to the hydraulic oil tank through the third solenoid valve, the second solenoid valve, the fourth solenoid valve, the brake unit, the seventh solenoid valve, the node C, and the third pressure-limiting valve. Part of the hydraulic oil is diverted before the node C and flows back to the hydraulic oil tank through the eighth solenoid valve, the particle sensor, the node K, and the node D. When the hydraulic flushing device switches to the second working state, The hydraulic oil is pumped by the low-pressure pump and flows back to the hydraulic oil tank through the third solenoid valve, the second solenoid valve, the fourth solenoid valve, the brake unit, the seventh solenoid valve, and the node D; Frequency conversion emptying includes low-pressure emptying and high-pressure emptying. After each low-pressure emptying and high-pressure emptying, the hydraulic oil is pumped by the low-pressure pump and then flows back to the hydraulic oil tank through the third solenoid valve, node D, and the first filter; It also includes a fifth solenoid valve and a second filter. When the hydraulic flushing device switches to the third working state, The hydraulic oil is pumped by the high-pressure pump and flows back to the hydraulic oil tank through the second filter, the fifth solenoid valve, the second solenoid valve, the fourth solenoid valve, the brake unit, the seventh solenoid valve, the node K, and the first filter; After each high-pressure discharge, the hydraulic oil is pumped by the high-pressure pump and then flows back to the hydraulic oil tank through the second filter, the fifth solenoid valve and the first filter.

2. The hydraulic flushing device for rail vehicle brake system according to claim 1, characterized in that: The plurality of solenoid valves are used to receive electrical signals sent by the control unit to drive the hydraulic flushing device to switch between a first working state, a second working state, a third working state and a fourth working state.

3. The hydraulic flushing device for rail vehicle brake system according to claim 1, characterized in that: It also includes a first solenoid valve, a sixth solenoid valve and a pressure sensor. When the hydraulic flushing device switches to the fourth working state, A closed oil circuit is formed between the first solenoid valve and the sixth solenoid valve, and the pressure sensor records the pressure of the closed oil circuit.

4. The hydraulic flushing device for rail vehicle brake systems according to claim 3, characterized in that: It also includes a first throttle valve, which is installed between the first solenoid valve and the sixth solenoid valve.

5. The hydraulic flushing device for rail vehicle brake system according to claim 4, characterized in that: It also includes an accumulator, which is connected to the first solenoid valve. When the accumulator accumulates pressure, the hydraulic oil is pumped by the high-pressure pump and then delivered to the accumulator through the first solenoid valve.

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