阅读说明：本技术 一种基于磁悬浮车辆的支撑轮的液压控制系统 (Hydraulic control system of supporting wheel based on magnetic levitation vehicle ) 是由 牛玉国 张彦伟 崔雷 刘帅 张敬斌 董振威 于 2020-04-28 设计创作，主要内容包括：本发明涉及一种基于磁悬浮车辆的支撑轮的液压控制系统,包括：电机、联轴器、液压泵、单向阀、电磁换向阀、油箱和两个压力开关；加压时,电磁换向阀通电,第二压力开关闭合；第二压力开关闭合后,电机通电,电机驱动液压泵从油箱中抽取油液,油液经过液压泵加压后输出至蓄能器和液压缸；支撑轮根据供油管路中的油液压力对磁悬浮车辆进行支撑；当供油回路的压力达到第一压力开关的设定压力值时,第一压力开关闭合,生成第一电平信号；当供油回路的压力达到第二压力开关的设定压力值时,第二压力开关断开,电机断电,液压泵停止工作；卸压时,电磁换向阀断电,油液经电磁换向阀流向油箱,供油回路中油液的压力下降,支撑轮恢复原位。(The invention relates to a hydraulic control system based on supporting wheels of a magnetic levitation vehicle, comprising: the hydraulic pump comprises a motor, a coupler, a hydraulic pump, a one-way valve, an electromagnetic directional valve, an oil tank and two pressure switches; when the pressure is increased, the electromagnetic directional valve is electrified, and the second pressure switch is closed; after the second pressure switch is closed, the motor is electrified, the motor drives the hydraulic pump to pump oil from the oil tank, and the oil is pressurized by the hydraulic pump and then is output to the energy accumulator and the hydraulic cylinder; the supporting wheels support the magnetic suspension vehicle according to the oil pressure in the oil supply pipeline; when the pressure of the oil supply loop reaches the set pressure value of the first pressure switch, the first pressure switch is closed to generate a first level signal; when the pressure of the oil supply loop reaches the set pressure value of the second pressure switch, the second pressure switch is disconnected, the motor is powered off, and the hydraulic pump stops working; when the pressure is relieved, the electromagnetic directional valve is powered off, oil flows to the oil tank through the electromagnetic directional valve, the pressure of the oil in the oil supply loop is reduced, and the supporting wheel is restored to the original position.)

1. A hydraulic control system based on support wheels of a magnetic levitation vehicle, the hydraulic control system comprising:

the hydraulic pump comprises a motor, a coupler, a hydraulic pump, a one-way valve, an electromagnetic directional valve, an oil tank and two pressure switches; the two pressure switches comprise a first pressure switch and a second pressure switch;

the motor is connected with the hydraulic pump through the coupler; the hydraulic pump is arranged in the oil tank, and an outlet of the hydraulic pump is connected with an oil way in the hydraulic control system through the one-way valve to form an oil supply loop; the first pressure switch and the second pressure switch are sequentially arranged on the oil supply loop; a first outlet of the oil supply loop is connected with an energy accumulator of the supporting wheel; a second outlet of the oil supply loop is connected with the hydraulic cylinder of the supporting wheel; a third outlet of the oil supply loop is connected with an inlet of the electromagnetic directional valve, and an outlet of the electromagnetic directional valve is connected with a first inlet of the oil tank;

when the hydraulic control system is pressurized, the electronic control unit of the magnetic suspension vehicle controls the electromagnetic directional valve to be electrified and the second pressure switch to be closed; after the second pressure switch is switched on, the motor is electrified, the motor drives the hydraulic pump to pump oil from the oil tank, and the oil is pressurized by the hydraulic pump and then is output to the energy accumulator and the hydraulic cylinder; the supporting wheels support the magnetic suspension vehicle according to the oil pressure in the oil supply pipeline;

when the pressure of the oil supply loop reaches the set pressure value of the first pressure switch, the first pressure switch is closed, a first level signal is generated, and the first level signal is sent to a vehicle monitoring system of the magnetic levitation vehicle;

when the pressure of the oil supply loop reaches the set pressure value of the second pressure switch, the second pressure switch is disconnected, the motor is powered off, the hydraulic pump stops working, and the hydraulic control system is in a pressure maintaining state; the set pressure value of the first pressure switch is smaller than that of the second pressure switch;

when the hydraulic control system releases pressure, the electromagnetic directional valve is powered off, oil flows to the oil tank through the electromagnetic directional valve, the pressure of the oil in the oil supply loop is reduced, and the supporting wheel recovers the original position.

2. The hydraulic control system of claim 1, further comprising: a manual unloader valve;

and a fourth outlet of the oil supply loop is connected with an inlet of the manual unloading valve, and an outlet of the manual unloading valve is connected with a second inlet of the oil tank for standby pressure relief.

3. The hydraulic control system of claim 2, further comprising: a first bi-directional filter, a second bi-directional filter, and a third bi-directional filter;

the first bidirectional filter is arranged at the outlet of the hydraulic pump;

the second bidirectional filter is arranged at the first outlet; one end of the second bidirectional filter is connected with the first outlet, and the other end of the second bidirectional filter is connected with the energy accumulator;

the third bidirectional filter is arranged at the second outlet; one end of the third bidirectional filter is connected with the second outlet, and the other end of the third bidirectional filter is connected with the hydraulic cylinder.

4. The hydraulic control system of claim 1, further comprising: a safety valve;

the safety valve is connected in parallel with the outlet of the hydraulic pump to limit the pressure of the oil output by the hydraulic pump.

5. The hydraulic control system of claim 2, further comprising: a first throttle damping and a second throttle damping;

the first throttling damper is arranged at an outlet of the electromagnetic directional valve, and the second throttling damper is arranged at an outlet of the manual unloading valve so as to slow down the pressure relief speed.

6. The hydraulic control system of claim 1, further comprising: an upper limit oil pointer and a lower limit oil pointer;

the upper limit oil level indicator and the lower limit oil level indicator are both arranged on the oil tank; the upper limit oil pointer is positioned above the lower limit oil pointer.

7. The hydraulic control system of claim 1, further comprising: a pressure sensor;

the pressure sensor is arranged on the oil supply loop to detect the pressure of oil in the oil supply loop.

Technical Field

The invention relates to the technical field of train braking, in particular to a hydraulic control system of a supporting wheel based on a magnetic levitation vehicle.

Background

The magnetic suspension vehicle is a novel rail vehicle which suspends the vehicle through an electromagnetic suspension control system and keeps a certain gap with a rail, and the vehicle is towed through a linear motor to move forwards/backwards, so that the magnetic suspension vehicle has the advantages of high speed, low noise, energy conservation and the like.

Since the magnetic levitation vehicle is not in contact with the track as in a conventional train, the safety performance requirements for the magnetic levitation vehicle are extremely high. And in order to improve the safety of the magnetic levitation vehicle under emergency, the bottom of the magnetic levitation vehicle is provided with supporting wheels. The supporting wheels can replace a suspension system to support the vehicle, and when an electromagnetic suspension control system of the magnetic suspension vehicle breaks down, the magnetic suspension vehicle can be dragged to run through the rescue vehicle. However, most of the supporting wheels on the market at present do not have a lifting function, and are not stable when the vehicle is dragged, so that the service life of the supporting wheels is influenced.

Disclosure of Invention

The invention aims to provide a hydraulic control system based on supporting wheels of a magnetic suspension vehicle, which can provide control and power for lifting or falling of the magnetic suspension vehicle when an electromagnetic suspension control system of the magnetic suspension vehicle breaks down and can ensure that the magnetic suspension vehicle can run stably when a rescue vehicle drags the magnetic suspension vehicle.

To achieve the above object, the present invention provides a hydraulic control system based on support wheels of a magnetic levitation vehicle, the hydraulic control system comprising:

the hydraulic pump comprises a motor, a coupler, a hydraulic pump, a one-way valve, an electromagnetic directional valve, an oil tank and two pressure switches; the two pressure switches comprise a first pressure switch and a second pressure switch;

the motor is connected with the hydraulic pump through the coupler; the hydraulic pump is arranged in the oil tank, and an outlet of the hydraulic pump is connected with an oil way in the hydraulic control system through the one-way valve to form an oil supply loop; the first pressure switch and the second pressure switch are sequentially arranged on the oil supply loop; a first outlet of the oil supply loop is connected with an energy accumulator of the supporting wheel; a second outlet of the oil supply loop is connected with the hydraulic cylinder of the supporting wheel; a third outlet of the oil supply loop is connected with an inlet of the electromagnetic directional valve, and an outlet of the electromagnetic directional valve is connected with a first inlet of the oil tank;

when the hydraulic control system is pressurized, the electronic control unit of the magnetic suspension vehicle controls the electromagnetic directional valve to be electrified and the second pressure switch to be closed; after the second pressure switch is switched on, the motor is electrified, the motor drives the hydraulic pump to pump oil from the oil tank, and the oil is pressurized by the hydraulic pump and then is output to the energy accumulator and the hydraulic cylinder; the supporting wheels support the magnetic suspension vehicle according to the oil pressure in the oil supply pipeline;

when the pressure of the oil supply loop reaches the set pressure value of the first pressure switch, the first pressure switch is closed, a first level signal is generated, and the first level signal is sent to a vehicle monitoring system of the magnetic levitation vehicle;

when the pressure of the oil supply loop reaches the set pressure value of the second pressure switch, the second pressure switch is disconnected, the motor is powered off, the hydraulic pump stops working, and the hydraulic control system is in a pressure maintaining state; the set pressure value of the first pressure switch is smaller than that of the second pressure switch;

when the hydraulic control system releases pressure, the electromagnetic directional valve is powered off, oil flows to the oil tank through the electromagnetic directional valve, the pressure of the oil in the oil supply loop is reduced, and the supporting wheel recovers the original position.

Preferably, the hydraulic control system further includes: a manual unloader valve;

and a fourth outlet of the oil supply loop is connected with an inlet of the manual unloading valve, and an outlet of the manual unloading valve is connected with a second inlet of the oil tank for standby pressure relief.

Further preferably, the hydraulic control system further includes: a first bi-directional filter, a second bi-directional filter, and a third bi-directional filter;

the first bidirectional filter is arranged at the outlet of the hydraulic pump;

the second bidirectional filter is arranged at the first outlet; one end of the second bidirectional filter is connected with the first outlet, and the other end of the second bidirectional filter is connected with the energy accumulator;

the third bidirectional filter is arranged at the second outlet; one end of the third bidirectional filter is connected with the second outlet, and the other end of the third bidirectional filter is connected with the hydraulic cylinder.

Preferably, the hydraulic control system further includes: a safety valve;

the safety valve is connected in parallel with the outlet of the hydraulic pump to limit the pressure of the oil output by the hydraulic pump.

Further preferably, the hydraulic control system further includes: a first throttle damping and a second throttle damping;

the first throttling damper is arranged at an outlet of the electromagnetic directional valve, and the second throttling damper is arranged at an outlet of the manual unloading valve so as to slow down the pressure relief speed.

Preferably, the hydraulic control system further includes: an upper limit oil pointer and a lower limit oil pointer;

the upper limit oil level indicator and the lower limit oil level indicator are both arranged on the oil tank; the upper limit oil pointer is positioned above the lower limit oil pointer.

Preferably, the hydraulic control system further includes: a pressure sensor;

the pressure sensor is arranged on the oil supply loop to detect the pressure of oil in the oil supply loop.

The hydraulic control system based on the supporting wheels of the magnetic levitation vehicle, provided by the embodiment of the invention, can provide control and power for lifting or falling of the magnetic levitation vehicle when the electromagnetic levitation control system of the magnetic levitation vehicle breaks down, and can ensure that the magnetic levitation vehicle can run stably when the rescue vehicle drags the magnetic levitation vehicle.

Drawings

Fig. 1 is a schematic structural diagram of a hydraulic control system based on support wheels of a magnetic levitation vehicle according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

The embodiment of the invention provides a hydraulic control system based on supporting wheels of a magnetic levitation vehicle, which can provide control and power for lifting or falling of the magnetic levitation vehicle when an electromagnetic levitation control system of the magnetic levitation vehicle breaks down, and can ensure that the magnetic levitation vehicle can run stably when a rescue vehicle drags the magnetic levitation vehicle.

Fig. 1 is a schematic structural diagram of a hydraulic control system based on support wheels of a magnetic levitation vehicle according to an embodiment of the present invention, and the technical solution of the present invention is described in detail below with reference to fig. 1.

First, the structure of the hydraulic control system according to the present invention will be described.

As shown in fig. 1, an embodiment of the present invention provides a hydraulic control system based on a support wheel of a magnetic levitation vehicle, including: the hydraulic control system comprises a motor 1, a coupler 2, a hydraulic pump 3, a one-way valve 12, an oil tank 4, an electromagnetic directional valve 5 and two pressure switches.

Wherein the two pressure switches comprise a first pressure switch 6 and a second pressure switch 7. The first pressure switch 6 is used for feeding back a signal for completing the motion of the supporting wheels (not shown in the figure), namely, the magnetic suspension vehicle reaches the maximum distance away from the rail surface through the supporting wheels. The second pressure switch 7 is connected with a motor contactor of the magnetic suspension vehicle, the starting and stopping of the motor 1 are controlled through the on-off state of the motor contactor, and the pressure of the supporting wheel is maintained in a certain interval through the starting and stopping of the motor 1, so that the magnetic suspension vehicle can run stably.

Specifically, the second pressure switch 7 is closed, the motor contactor is closed, and the motor 1 is started by power. The second pressure switch 7 is switched off, the motor contactor is switched off, and the motor 1 is powered off and stops.

In a preferred aspect, the hydraulic control system further includes: the device comprises a pressure sensor 8, a first bidirectional filter 11, a second bidirectional filter 10, a third bidirectional filter 9, a manual unloading valve 13, a safety valve 14, a first throttling damper 15, a second throttling damper 16, an upper limit oil indicator 17 and a lower limit oil indicator 18.

The motor 1 is connected with the hydraulic pump 3 through the coupler 2, and the motor 1 drives the hydraulic pump 3 arranged in the oil tank 4 to extract oil from the oil tank 4.

In a preferred scheme, the upper limit oil pointer 17 and the lower limit oil pointer 18 are both arranged on the oil tank 4, and the upper limit oil pointer 17 is located above the lower limit oil pointer 18, so that the oil level of oil in the oil tank 4 can be observed conveniently, and a worker can supplement or discharge the oil in time. Still be provided with the oiling socket on the oil tank 4, can pass through quick oiling of oiling socket and oil extraction, H position in the oiling socket sees the figure. The hydraulic control system is also provided with an air filter 19 which is used for removing particle impurities in air in the hydraulic control system, reducing the abrasion of internal parts and prolonging the service life of the hydraulic control system.

The outlet of the hydraulic pump 3 is connected with an oil circuit in the hydraulic control system through a one-way valve 12 to form an oil supply loop. The oil circuit can be understood as a pipeline through which oil in the hydraulic control system passes.

The first pressure switch 6 and the second pressure switch 7 are arranged on the oil supply circuit in sequence.

In a preferred embodiment, a relief valve 14 is connected in parallel to the outlet of the hydraulic pump 3 for limiting the pressure of the oil output from the hydraulic pump 3. A pressure sensor 8 is also provided on the oil supply circuit for detecting the pressure of the oil in the oil supply circuit. The first bidirectional filter 11 is disposed at an outlet of the hydraulic pump 3, and filters impurities in the oil flowing out from the outlet of the hydraulic pump 3. The check valve 12 prevents the oil entering the oil supply circuit from flowing back to the oil tank 4 through the hydraulic pump 3, affecting the pressure in the oil supply circuit.

The first outlet of the oil supply loop is connected with the energy accumulator of the supporting wheel. The connection port of the accumulator supporting the wheel to the hydraulic control system is shown in position a in the figure. The second bidirectional filter 10 is disposed at a first outlet of the oil supply circuit, and one end of the second bidirectional filter 10 is connected to the first outlet and the other end is connected to the accumulator to filter impurities in the oil flowing out from the accumulator.

And a second outlet of the oil supply loop is connected with the hydraulic cylinder of the support wheel. The connection port of the hydraulic cylinder of the support wheel and the hydraulic control system is shown as position P in the figure. The third two-way filter 9 is arranged at a second outlet of the oil supply loop, one end of the third two-way filter 9 is connected with the second outlet, the other end of the third two-way filter 9 is connected with the hydraulic cylinder, and the third two-way filter 9 is used for filtering impurities in oil flowing out of the hydraulic cylinder.

The third outlet of the oil supply loop is connected with the inlet of the electromagnetic directional valve 5, and the outlet of the electromagnetic directional valve 5 is connected with the first inlet of the oil tank 4. The electromagnetic directional valve 5 is preferably a two-position two-way electromagnetic directional valve. The first throttling damper 15 is arranged at the outlet of the electromagnetic directional valve 5, so that the phenomenon that the pressure drop speed is too high during pressure relief and the impact of the vehicle weight on the supporting wheel is avoided.

The fourth outlet of the oil supply loop is connected with the inlet of the manual unloading valve 13, the outlet of the manual unloading valve 13 is connected with the second inlet of the oil tank 4, and the manual unloading valve 13 is used for standby pressure relief. The second throttling damper 16 is arranged at the outlet of the manual unloading valve 13, so that the phenomenon that the pressure drop speed is too high during manual pressure relief and the impact of the vehicle weight on the supporting wheel is avoided.

The operation of the hydraulic control system is explained below.

When the hydraulic control system is pressurized, the electronic control unit of the magnetic suspension vehicle controls the electromagnetic directional valve 5 to be electrified and the second pressure switch 7 to be closed. The electronic control unit refers to a device that sends a control command to the hydraulic control system by manual operation. After the second pressure switch 7 is closed, the motor 1 is electrified, the motor 1 controls the hydraulic pump 3 to extract oil from the oil tank 4, and the oil is pressurized by the hydraulic pump 3 and then is output to the energy accumulator through the one-way valve 12 and the oil supply loop. The supporting wheels support the magnetic suspension vehicle according to the oil pressure in the oil supply loop, and the supporting action can be understood as the gradual increase of the distance between the bottom of the magnetic suspension vehicle and the plane of the magnetic suspension track.

When the pressure of the oil supply circuit reaches the set pressure value of the first pressure switch 6, the first pressure switch 6 is closed, a first level signal is generated, and the first level signal is sent to a vehicle monitoring system of the magnetic levitation vehicle. The first level is high level, and the vehicle monitoring system can judge that the magnetic suspension vehicle has risen to the place after receiving the first level signal, namely the magnetic suspension vehicle reaches the maximum height from the rail surface and can be matched with a rescue vehicle to drag.

When the pressure of the oil supply loop reaches the set pressure value of the second pressure switch 7, the second pressure switch 7 is disconnected, the motor 1 is powered off, the hydraulic pump 3 stops working, and the hydraulic control system is in a pressure maintaining state. Wherein, the set pressure value of the first pressure switch 6 is smaller than the set pressure value of the second pressure switch 7. The pressure maintaining state means that the pressure of the oil in the oil supply circuit is between the set pressure value of the first pressure switch 6 and the set pressure value of the second pressure switch 7, so that the stability of the supporting wheel is ensured.

In a preferred solution, the set pressure values of the second pressure switch 7 comprise a rising opening set pressure value and a falling closing set pressure value of the second pressure switch 7. Wherein, the rising opening set pressure value of the second pressure switch 7 is larger than the falling closing set pressure value.

The pressure maintaining state means that the pressure of the oil in the oil supply circuit is between the rising opening set pressure value and the falling closing set pressure value of the second pressure switch 7, thereby ensuring the stability of the support wheel.

When the pressure in the pipeline is smaller than the set pressure value of the descending closing of the second pressure switch 7 due to the pressure relief of various valves in the pressure maintaining state, the second pressure switch 7 is closed again, the motor 1 is started again, and the hydraulic pump 3 is driven to pressurize the oil supply loop. When the pressure value in the oil supply loop reaches the rising cut-off set pressure value of the second pressure switch 7 again, the motor 1 is powered off, and the hydraulic pump 3 stops working. The reciprocating operation is performed continuously to ensure that the pressure value in the oil supply loop is within a certain interval.

When the hydraulic control system releases pressure, the electronic control unit controls the electromagnetic directional valve 5 to be powered off, oil flows to the oil tank 4 through the electromagnetic directional valve 5, and the pressure of the oil in the oil supply loop is reduced until the supporting wheel recovers the original position.

When the electromagnetic directional valve 5 fails and cannot assist the oil in the oil supply loop to release pressure, the oil in the oil supply loop can flow to the oil tank 4 through the manual unloading valve 13, so that the pressure of the oil supply loop is reduced, and the support wheels assist the magnetic suspension vehicle to slowly descend.

In practical application, the supporting capacity of the supporting wheels can be adjusted by adjusting the set pressure values of the first pressure switch 6 and the second pressure switch 7, namely, the weight of the vehicle body which can be supported by the supporting wheels is adjusted, and the safety of the hydraulic control system is improved so as to adapt to vehicles with various weights.

For example, when the pressure in the pipeline reaches the set pressure value of 100bar of the first pressure switch 6, the maximum weight of the train supported by the supporting wheels is 70 tons. By adjusting the set pressure value of the first pressure switch 6 to 120bar, the maximum train weight that the supporting wheels can support is increased to 80 tons.

The hydraulic control system based on the supporting wheels of the magnetic suspension vehicle can provide control and power for lifting or falling of the magnetic suspension vehicle when the electromagnetic suspension control system of the magnetic suspension vehicle breaks down, and can ensure that the magnetic suspension vehicle can stably run when a rescue vehicle drags the magnetic suspension vehicle.

Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.