Hydraulic rescue lifting control system for a magnetic levitation vehicle and method of controlling the same

Abstract

The application discloses a hydraulic rescue lifting control system of a magnetic levitation vehicle, which comprises an oil tank and a hydraulic cylinder for driving the lifting of a rescue wheel, a pressure supply system for oil outlet is arranged in the oil tank, the output end of the pressure supply system is connected with the hydraulic cylinder through an oil path control system, an oil return system for connecting the oil tank with oil return is arranged on the connecting pipeline of the oil path control system and the hydraulic cylinder, the oil path control system comprises a three-position four-way electromagnetic valve, a first balance valve and a second balance valve, the three-position four-way electromagnetic valve comprises an oil port A1, an oil port A2, an oil port A3 and an oil port A4. The application can realize the continuous control of the lifting of the vehicle before and after the rescue, avoids the great impact load of the vehicle body during the descending of the vehicle from having a certain degree of adverse effect on the vehicle, and realizes the motion stability of the vehicle and the rescue control system during the rescue and the cancellation of the rescue.

Description

Technical Field

[0001] This invention relates to the field of suspended vehicle rescue technology, specifically to a hydraulic lifting control system and control method for magnetic levitation vehicles used in rescue operations. Background Technology

[0002] Maglev vehicles levitate near the track using electromagnetic forces between electromagnets and the track, maintaining a certain gap between the vehicle and the track. Maglev vehicles have extremely high safety requirements. If the vehicle loses its electromagnetic levitation capability due to a malfunction, it cannot move normally. Therefore, rescue wheels need to be installed at the bottom of the vehicle, and a hydraulic rescue control system activates these wheels to tow the rescue vehicle.

[0003] The shortcomings of existing technology:

[0004] The existing magnetic levitation vehicle rescue control system does not have the function of continuous controllable support force during the lifting and lowering process. The huge impact load on the vehicle body during the descent process will have a certain degree of adverse effect on the vehicle, and may cause damage to the vehicle body in severe cases. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic lifting control system for magnetic levitation vehicles to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic rescue lifting control system for a magnetic levitation vehicle, comprising an oil tank and a hydraulic cylinder for driving the lifting of rescue wheels. The oil tank is internally equipped with a pressure supply system for oil delivery. The output end of the pressure supply system is connected to the hydraulic cylinder via an oil circuit control system. A return oil system for connecting the oil tank to the hydraulic cylinder is provided on the connecting pipeline between the oil circuit control system and the hydraulic cylinder. The oil circuit control system includes:

[0007] A three-position four-way solenoid valve, comprising port A1, port A2, port A3 and port A4, wherein port A1 of the three-position four-way solenoid valve is connected to the oil outlet pipe of the pressure supply system.

[0008] The first balance valve includes an oil port B1, an oil port B2 and a pressure control port A. The oil ports A4 and A2 of the three-position four-way solenoid valve are respectively connected to the oil port B2 and the pressure control port A of the first balance valve. The oil port B1 of the first balance valve is connected to the rod chamber of the hydraulic cylinder.

[0009] The second balance valve includes an oil port C1, an oil port C2, and a pressure control port B. The oil ports A2 and A4 of the three-position four-way solenoid valve are respectively connected to the oil port C2 and the pressure control port B of the second balance valve. The oil port C1 of the second balance valve is connected to the rodless chamber of the hydraulic cylinder.

[0010] As a further improvement of the present invention, the oil return system includes:

[0011] A two-position two-way solenoid valve A, wherein the two oil ports of the two-position two-way solenoid valve A are respectively connected to the oil port B1 of the first balance valve and the oil tank.

[0012] Two-position two-way solenoid valve B, wherein the two oil ports of the two-position two-way solenoid valve B are respectively connected to the oil port C1 of the second balance valve and the oil tank.

[0013] Two pressure sensors are respectively installed on the pipeline between the two-position two-way solenoid valve A and the first balancing valve, and on the pipeline between the two-position two-way solenoid valve B and the second balancing valve.

[0014] As a further improvement of the present invention, the pressure supply system includes:

[0015] An oil pump, which is located inside the oil tank;

[0016] The motor, the output end of which is connected to the oil pump via a coupling;

[0017] The oil supply pipe is located between the oil pump and the oil port A1 of the three-position four-way solenoid valve.

[0018] As a further improvement of the present invention, the oil supply pipe is provided with an inlet filter for filtering the oil and a one-way valve to prevent the pressure oil output by the oil pump from flowing back to the oil tank. A safety valve for setting the maximum system pressure and preventing overload of the motor and oil pump is provided on the pipeline between the oil pump and the one-way valve on the oil supply pipe. The other end of the safety valve is provided with a connecting pipe connected to the oil tank.

[0019] As a further improvement of the present invention, the fuel tank is provided with:

[0020] A level gauge is used to detect and observe the oil level in the oil tank.

[0021] A respirator used to balance the air pressure inside the fuel tank.

[0022] As a further improvement of the present invention, the lifting control system also includes an electrical connector for connecting the electronic rescue control unit. The electronic rescue control unit is used for receiving rescue commands, providing information feedback, driving the motor controller and hydraulic rescue power unit, pressure detection, and fault diagnosis. The motor is controlled by the motor controller, which is used to receive signals from the electronic rescue control unit and control the start and stop of the motor in the hydraulic rescue power unit, and to feed back the motor's working status to the electronic rescue control unit.

[0023] As a further improvement of the present invention, a hydraulic rescue lifting control method for a magnetic levitation vehicle is also disclosed, which includes the following steps:

[0024] S1. Based on the rescue signal, the motor is started. At the same time, the S1.2 solenoid coil of the three-position four-way solenoid valve is energized, making it work in the right functional position. The pressure oil generated by the oil pump enters the rod chamber of the hydraulic cylinder through the three-position four-way solenoid valve and the check valve in the first balance valve, pushing the hydraulic cylinder piston rod to retract and causing the maglev vehicle rescue wheel to fall. At the same time, the oil inlet pressure of the first balance valve port B2 is used as the control pressure to control the oil circuit from port C1 to port C2 of the second balance valve to open. The hydraulic oil in the rodless chamber of the hydraulic cylinder returns to the oil tank through the second balance valve and the three-position four-way solenoid valve.

[0025] S2. When the hydraulic cylinder drives the rescue wheel to fall and lift the vehicle body to the rescue limit position, the lifting control system controls the motor to stop operating based on the pressure detected by the two pressure sensors. At the same time, the three-position four-way solenoid valve is de-energized, and the two-position two-way solenoid valves A and B are energized to unload the hydraulic oil to the oil tank, ensuring that there is no pressure at the oil pump outlet and in both the rod chamber and rodless chamber of the hydraulic cylinder. After unloading is completed, the two-position two-way solenoid valves A and B are de-energized.

[0026] S3. Based on the cancellation of the rescue signal, the control motor starts, and at the same time, the S1.1 solenoid coil of the three-position four-way solenoid valve is energized, so that it works in the left functional position. The pressure oil generated by the oil pump enters the rodless chamber of the hydraulic cylinder through the one-way valve in the three-position four-way solenoid valve and the second balance valve, pushing the piston rod of the hydraulic cylinder to extend and drive the rescue wheel of the maglev vehicle to rise. At the same time, the oil inlet pressure of the second balance valve is used as the control pressure to control the oil circuit from oil port B1 to oil port B2 of the first balance valve to open. The hydraulic oil in the rod chamber of the hydraulic cylinder returns to the oil tank through the first balance valve and the three-position four-way solenoid valve.

[0027] S4. When the hydraulic cylinder drives the rescue wheel to rise and lower the vehicle onto the track, the lifting control system controls the motor to stop operating based on the pressure detected by the two pressure sensors. At the same time, the three-position four-way solenoid valve is de-energized, while the two-position two-way solenoid valves A and B are energized, unloading the pressure oil into the oil tank to ensure that there is no pressure at the oil pump outlet and in both the rod-side and rodless-side chambers of the hydraulic cylinder. After unloading is completed, the two-position two-way solenoid valves A and B are de-energized.

[0028] As a further improvement of the present invention, in this method, when the hydraulic cylinder drives the rescue wheel to fall, if the load on the hydraulic cylinder piston rod changes from a positive load to a load, the hydraulic oil pressure in the rod chamber of the hydraulic cylinder drops rapidly, the control pressure of the second balance valve pressure control port B decreases, and the oil passage flow area of ​​the second balance valve oil ports C1 and C2 decreases or is completely closed, which plays a hydraulic control throttling role on the return oil of the rodless chamber of the hydraulic cylinder, ensuring the smooth retraction of the hydraulic cylinder piston rod, thereby ensuring the smooth lifting of the magnetic levitation vehicle during the rescue process.

[0029] As a further improvement of the present invention, when the hydraulic cylinder drives the rescue wheel to rise, and the load on the piston rod of the hydraulic cylinder changes from a positive load to a negative load, the hydraulic oil pressure in the rodless chamber of the hydraulic cylinder drops rapidly. The control pressure of the first balance valve pressure control port A decreases, and the oil passage area of ​​the first balance valve oil port B1 and oil port B2 decreases or is completely closed. This has a hydraulic control throttling effect on the return oil in the rod chamber of the hydraulic cylinder, ensuring the smooth extension of the hydraulic cylinder, thereby ensuring the smooth descent of the magnetic levitation vehicle during the rescue process.

[0030] As a further improvement of the present invention, in the non-rescue state, the piston rod of the hydraulic cylinder is in the extended state. When the rescue is started, the piston rod retracts and the hydraulic cylinder drives the rescue wheel to fall and lift the vehicle body.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] This invention incorporates an oil circuit control system and a return oil system. The oil circuit control system includes a three-position four-way solenoid valve, a first balance valve, and a second balance valve. The return oil system includes a two-position two-way solenoid valve, a two-position two-way solenoid valve, and two pressure sensors. Through the coordinated flow guidance of the three-position four-way solenoid valve 41, the first balance valve 42, the second balance valve 43, the two-position two-way solenoid valve A51, and the various oil ports, continuous control of vehicle lifting and lowering before and after rescue can be achieved. This avoids the adverse effects of the huge impact load on the vehicle body during descent, ensuring the smooth movement of the vehicle and the rescue control system during rescue and cancellation processes. Attached Figure Description

[0033] Figure 1This is a schematic diagram of a hydraulic lifting control system for a magnetic levitation vehicle used in rescue operations, according to the present invention.

[0034] Figure 2 This is a schematic diagram of the installation of the rescue wheel in the hydraulic rescue lifting control system for a magnetic levitation vehicle according to the present invention;

[0035] Figure 3 This is a diagram illustrating a non-rescue situation.

[0036] Figure 4 This is a diagram illustrating the rescue situation.

[0037] In the diagram: 1. Oil tank; 2. Hydraulic cylinder; 3. Pressure supply system; 31. Oil pump; 32. Motor; 33. Oil supply pipe; 4. Oil circuit control system; 41. Three-position four-way solenoid valve; 411. Oil port A1; 412. Oil port A2; 413. Oil port A3; 414. Oil port A4; 42. First balance valve; 421. Oil port B1; 422. Oil port B2; 423. Pressure control port A; 43. Second balance valve; 431. Oil port C1; 432. Oil port C2; 433. Pressure control port B; 5. Oil return system; 51. Two-position two-way solenoid valve A; 52. Two-position two-way solenoid valve B; 53. Two pressure sensors; 6. Oil filter; 7. Check valve; 8. Safety valve; 9. Level gauge; 10. Breather. Detailed Implementation

[0038] To make the technical problems, solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0039] It should be noted that when an element is referred to as "fixed," "mounted," "connected," or "set" with another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0040] As a further improvement of the present invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0041] Example 1

[0042] Please see Figure 1 The present invention provides a technical solution: a hydraulic rescue lifting control system for a magnetic levitation vehicle, including an oil tank 1 and a hydraulic cylinder 2 for driving the lifting of the rescue wheel. The oil tank 1 is equipped with a pressure supply system 3 for oil discharge. The output end of the pressure supply system 3 is connected to the hydraulic cylinder 2 through a connecting oil circuit control system 4. The connecting pipeline between the oil circuit control system 4 and the hydraulic cylinder 2 is connected to a return oil system 5 for connecting the oil tank 1 to return oil. In use, the pressure supply system 3 draws liquid oil from the oil tank 1 to generate a high-pressure oil circuit, and the oil circuit control system 4 regulates the oil supplied to the rodless chamber or rod chamber of the hydraulic cylinder 2 to control the lifting of the rescue wheel.

[0043] The pressure supply system 3 includes an oil pump 31, a motor 32, and an oil supply pipe 33. The oil pump 31 is installed inside the oil tank 1. The output end of the motor 32 is connected to the oil pump 31 through a coupling. The oil supply pipe 33 is connected between the oil pump 31 and the oil port A1411 of the three-position four-way solenoid valve 41. When working, the motor 32 drives the oil pump 31 to work, and the oil enters the oil circuit control system 4 through the oil supply pipe 33 under the action of the oil pump 31.

[0044] The oil circuit control system 4 includes a three-position four-way solenoid valve 41, a first balancing valve 42, and a second balancing valve 43. The three-position four-way solenoid valve 41 includes ports A1411, A2412, A3413, and A4414. Port A1411 of the three-position four-way solenoid valve 41 is connected to the oil outlet pipe of the pressure supply system 3. The first balancing valve 42 includes ports B1421, B2422, and a pressure control port A423. Ports A4414 and A2412 of the three-position four-way solenoid valve 41 are respectively connected to ports B1421, B2422, and A423 of the first balancing valve 43. 2422 is connected to pressure control port A423. The oil port B1421 of the first balance valve 42 is connected to the rod chamber of the hydraulic cylinder 2. The second balance valve 43 includes oil port C1431, oil port C2432 and pressure control port B433. The oil ports A2412 and A4414 of the three-position four-way solenoid valve 41 are connected to the oil port C2432 and pressure control port B433 of the second balance valve 43, respectively. The oil port C1431 of the second balance valve 43 is connected to the rodless chamber of the hydraulic cylinder 2. When the telescopic rod of the hydraulic cylinder 2 retracts, the S1 of the three-position four-way solenoid valve 41 is activated. 2. When the electromagnetic coil is energized, it operates in the right functional position. The pressurized oil generated by the oil pump 31 enters the rod chamber of the hydraulic cylinder 2 through the three-position four-way solenoid valve 41 and the check valve in the first balance valve 42, pushing the piston rod of the hydraulic cylinder 2 to retract and causing the rescue wheel of the maglev vehicle to fall. The oil inlet pressure of port B2422 of the first balance valve 42 serves as the control pressure, controlling the opening of the oil circuit from port C1431 to port C2432 of the second balance valve 43. The hydraulic oil in the rodless chamber of the hydraulic cylinder 2 returns to the oil tank 1 through the second balance valve 43 and the three-position four-way solenoid valve 41, and the extension rod of the hydraulic cylinder 2 extends. For an extended period, the S1.1 solenoid coil of the three-position four-way solenoid valve 41 is energized, causing it to operate in the left functional position. The pressurized oil generated by the oil pump 31 enters the rodless chamber of the hydraulic cylinder 2 through the one-way valve in the three-position four-way solenoid valve 41 and the second balance valve 43, pushing the piston rod of the hydraulic cylinder 2 to extend and driving the rescue wheel of the maglev vehicle to rise. At the same time, the oil inlet pressure of the second balance valve 43 serves as the control pressure, controlling the opening of the oil circuit from oil port B1421 to oil port B2422 of the first balance valve 42. The hydraulic oil in the rod chamber of the hydraulic cylinder 2 returns to the oil tank 1 through the first balance valve 42 and the three-position four-way solenoid valve 41.

[0045] The oil return system 5 includes a two-position two-way solenoid valve A51, a two-position two-way solenoid valve B52, and two pressure sensors 53. The two ports of the two-position two-way solenoid valve A51 are connected to the port B1421 of the first balance valve 42 and the oil tank 1, respectively. The two ports of the two-position two-way solenoid valve B52 are connected to the port C1431 of the second balance valve 43 and the oil tank 1, respectively. The two pressure sensors 53 are respectively installed on the pipes between the two-position two-way solenoid valve A51 and the first balance valve 42, and on the pipes between the two-position two-way solenoid valve B52 and the second balance valve 43. When the piston rod of the hydraulic cylinder 2 retracts, the rescue wheel falls and lifts the vehicle body to the rescue limit position. At the same time, the lifting control system, based on the pressure detected by the two pressure sensors 53, controls the motor 32 to stop operating. The three-position four-way solenoid valve 41 is de-energized, while the two-position two-way solenoid valves A51 and B52 are energized, unloading the hydraulic oil to the oil tank 1. This ensures that there is no pressure at the pump outlet of oil pump 31 and in both the rod-side and rodless-side chambers of hydraulic cylinder 2. After unloading, the two-position two-way solenoid valves A51 and B52 are de-energized. When the rescue wheel rises and pulls the vehicle down to the track, the lifting control system controls the motor 32 to stop operating based on the pressure detected by the two pressure sensors 53. At the same time, the three-position four-way solenoid valve 41 is de-energized, while the two-position two-way solenoid valves A51 and B52 are energized, unloading the pressure oil to the oil tank 1. This ensures that there is no pressure at the pump outlet of oil pump 31 and in both the rod-side and rodless-side chambers of hydraulic cylinder 2. After unloading, the two-position two-way solenoid valves A51 and B52 are de-energized.

[0046] In some embodiments of the present invention, an oil inlet filter 6 for filtering oil and a one-way valve 7 for preventing the pressure oil output by the oil pump 31 from flowing back to the oil tank 1 are installed on the oil supply pipe 33. A safety valve 8 for setting the maximum system pressure and preventing overload of the motor 32 and the oil pump 31 is installed on the pipeline between the oil pump 31 and the one-way valve 7 on the oil supply pipe 33. The other end of the safety valve 8 is connected to a connecting pipe connected to the oil tank 1.

[0047] In some embodiments of the present invention, a level gauge 9 and a breather 10 are installed on the oil tank 1. The level gauge 9 is used to detect and observe the oil level in the oil tank 1, and the breather 10 is used to balance the air pressure in the oil tank 1.

[0048] In some embodiments of the present invention, the lifting control system further includes an electrical connector for connecting to the electronic rescue control unit. The electronic rescue control unit is used for receiving rescue commands, providing information feedback, driving the motor controller and hydraulic rescue power unit, pressure detection, and fault diagnosis. The motor 32 is controlled by the motor controller, which is used to receive signals from the electronic rescue control unit and control the start and stop of the motor in the hydraulic rescue power unit, and to feed back the working status of the motor 32 to the electronic rescue control unit.

[0049] Example 2

[0050] This invention also provides a hydraulic lifting control method for magnetic levitation vehicles used in rescue operations. This control method includes the following steps:

[0051] S1. According to the rescue signal, the control motor 32 is started. At the same time, the S1.2 electromagnetic coil of the three-position four-way solenoid valve 41 is energized, so that it works in the right functional position. The pressure oil generated by the oil pump 31 enters the rod chamber of the hydraulic cylinder 2 through the three-position four-way solenoid valve 41 and the check valve in the first balance valve 42, pushing the piston rod of the hydraulic cylinder 2 to retract and drive the rescue wheel of the maglev vehicle to fall. At the same time, the oil inlet pressure of the oil port B2422 of the first balance valve 42 is used as the control pressure to control the oil circuit from the oil port C1431 to the oil port C2432 of the second balance valve 43 to open. The hydraulic oil in the rodless chamber of the hydraulic cylinder 2 returns to the oil tank 1 through the second balance valve 43 and the three-position four-way solenoid valve 41.

[0052] S2. When the hydraulic cylinder 2 drives the rescue wheel to fall and lift the vehicle body to the rescue limit position, the lifting control system controls the motor 32 to stop operating based on the pressure detected by the two pressure sensors 53. At the same time, the three-position four-way solenoid valve 41 is de-energized, and the two-position two-way solenoid valves A51 and B52 are energized to unload the hydraulic oil to the oil tank 1, ensuring that there is no pressure at the pump outlet of the oil pump 31 and in both the rod chamber and rodless chamber of the hydraulic cylinder 2. After unloading is completed, the two-position two-way solenoid valves A51 and B52 are de-energized.

[0053] S3. According to the cancellation of the rescue signal, the control motor 32 is started. At the same time, the S1.1 electromagnetic coil of the three-position four-way solenoid valve 41 is energized so that it works in the left functional position. The pressure oil generated by the oil pump 31 enters the rodless chamber of the hydraulic cylinder 2 through the one-way valve in the three-position four-way solenoid valve 41 and the second balance valve 43, pushing the piston rod of the hydraulic cylinder 2 to extend and drive the rescue wheel of the maglev vehicle to rise. At the same time, the oil inlet pressure of the second balance valve 43 is used as the control pressure to control the oil circuit from oil port B1421 to oil port B2422 of the first balance valve 42 to open. The hydraulic oil in the rod chamber of the hydraulic cylinder 2 returns to the oil tank 1 through the first balance valve 42 and the three-position four-way solenoid valve 41.

[0054] S4. When the hydraulic cylinder 2 drives the rescue wheel to rise and lower the vehicle to the track, the lifting control system controls the motor 32 to stop operating based on the pressure detected by the two pressure sensors 53. At the same time, the three-position four-way solenoid valve 41 is de-energized, and the two-position two-way solenoid valves A51 and B52 are energized, unloading the pressure oil to the oil tank 1 to ensure that there is no pressure at the outlet of the oil pump 31 and in both the rod chamber and rodless chamber of the hydraulic cylinder 2. After unloading is completed, the two-position two-way solenoid valves A51 and B52 are de-energized.

[0055] In some embodiments of the present invention, when the hydraulic cylinder 2 drives the rescue wheel to fall, and the load on the piston rod of the hydraulic cylinder 2 changes from a positive load to a load, the hydraulic oil pressure in the rod chamber of the hydraulic cylinder 2 drops rapidly, the control pressure of the pressure control port B433 of the second balance valve 43 decreases, and the oil passage flow area of ​​the oil ports C1431 and C2432 of the second balance valve 43 decreases or is completely closed, which plays a hydraulic control throttling role on the return oil of the rodless chamber of the hydraulic cylinder 2, ensuring that the piston rod of the hydraulic cylinder 2 retracts smoothly, thereby ensuring that the magnetic levitation vehicle rises smoothly during the rescue process.

[0056] In some embodiments of the present invention, when the hydraulic cylinder 2 drives the rescue wheel to rise, and the load on the piston rod of the hydraulic cylinder 2 changes from a positive load to a load, the hydraulic oil pressure in the rodless chamber of the hydraulic cylinder 2 drops rapidly. The control pressure of the pressure control port A423 of the first balance valve 42 decreases, and the oil passage flow area of ​​the oil port B1421 and oil port B2422 of the first balance valve 42 decreases or is completely closed. This has a hydraulic control throttling effect on the return oil in the rod chamber of the hydraulic cylinder 2, ensuring that the hydraulic cylinder 2 extends smoothly, thereby ensuring that the magnetic levitation vehicle falls smoothly during the rescue process.

[0057] In some embodiments of the present invention, in the non-rescue state, the piston rod of the hydraulic cylinder 2 is in the extended state. When the rescue is initiated, the piston rod retracts, and the hydraulic cylinder 2 drives the rescue wheel to fall and lift the vehicle body.

[0058] In this invention, by using the three-position four-way solenoid valve 41, the first balance valve 42, the second balance valve 43, the two-position two-way solenoid valve A51, and the mutual coordination of each oil port, continuous control of vehicle lifting and lowering before and after rescue can be achieved. This avoids the huge impact load on the vehicle body during the descent process from having a certain degree of adverse effect on the vehicle, and ensures the smooth movement of the vehicle and rescue control system during rescue and cancellation of rescue.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A control method for a hydraulic rescue lifting control system of a magnetic levitation vehicle, the control system comprising an oil tank (1) and a hydraulic cylinder (2) for driving the lifting of a rescue wheel, a pressure supply system (3) for oil outlet being arranged inside the oil tank (1), an output end of the pressure supply system (3) being connected with the hydraulic cylinder (2) through an oil path control system (4), a return oil system (5) for connecting the oil tank (1) to return oil being arranged on a connecting pipeline of the oil path control system (4) and the hydraulic cylinder (2), the oil path control system (4) comprising a three-position four-way electromagnetic valve (41), a first balance valve (42) and a second balance valve (43), the return oil system (5) comprising a two-position two-way electromagnetic valve A (51), a two-position two-way electromagnetic valve B (52) and two pressure sensors (53), and the pressure supply system (3) comprising an oil pump (31), a motor (32) and an oil supply pipe (33); characterized in that the control method comprising the following steps: S1. According to a rescue signal, the motor (32) is started, at the same time, the electromagnetic coil of the three-position four-way electromagnetic valve (41) is electrified to make it work in the right function position, the pressure oil generated by the oil pump (31) enters the rod cavity of the hydraulic cylinder (2) through the one-way valve in the three-position four-way electromagnetic valve (41) and the first balance valve (42), the hydraulic cylinder (2) piston rod is retracted to drive the magnetic levitation vehicle rescue wheel to fall down, at the same time, the oil inlet pressure of the oil port B2 (422) of the first balance valve (42) is used as the control pressure to control the oil path opening of the oil port C1 (431) to the oil port C2 (432) of the second balance valve (43), the hydraulic oil in the rodless cavity of the hydraulic cylinder (2) returns to the oil tank (1) through the second balance valve (43) and the three-position four-way electromagnetic valve (41); S2. When the hydraulic cylinder (2) drives the rescue wheel to fall down to lift the vehicle body to the rescue limit rescue position, the lifting control system controls the motor (32) to stop according to the pressure detected by the two pressure sensors (53), at the same time, the three-position four-way electromagnetic valve (41) is de-energized, the two-position two-way electromagnetic valve A (51) and the two-position two-way electromagnetic valve B (52) are electrified to unload the hydraulic pressure oil to the oil tank (1), to ensure that the pump outlet of the oil pump (31) and the rod cavity and the rodless cavity of the hydraulic cylinder (2) are all without pressure, and the two-position two-way electromagnetic valve A (51) and the two-position two-way electromagnetic valve B (52) are de-energized after unloading is completed; S3. According to a rescue cancellation signal, the motor (32) is started, at the same time, the S1.1 electromagnetic coil of the three-position four-way electromagnetic valve (41) is electrified to make it work in the left function position, the pressure oil generated by the oil pump (31) enters the rodless cavity of the hydraulic cylinder (2) through the one-way valve in the three-position four-way electromagnetic valve (41) and the second balance valve (43), the hydraulic cylinder (2) piston rod is extended to drive the magnetic levitation vehicle rescue wheel to rise up, at the same time, the oil inlet pressure of the second balance valve (43) is used as the control pressure to control the oil path opening of the oil port B1 (421) to the oil port B2 (422) of the first balance valve (42), the hydraulic oil in the rod cavity of the hydraulic cylinder (2) returns to the oil tank (1) through the first balance valve (42) and the three-position four-way electromagnetic valve (41). S4, when the hydraulic cylinder (2) drives the rescue wheel to lift and drive the vehicle to fall to the track, the lifting control system controls the motor (32) to stop according to the pressure detected by the two pressure sensors (53), at the same time, the three-position four-way electromagnetic valve (41) is de-energized, the two-position two-way electromagnetic valve A (51) and the two-position two-way electromagnetic valve B (52) are energized, the pressure oil is unloaded to the oil tank (1), and the outlet of the oil pump (31) and the rod cavity and the rod cavity of the hydraulic cylinder (2) are all without pressure. After unloading, the two-position two-way electromagnetic valve A (51) and the two-position two-way electromagnetic valve B (52) are de-energized.

2. The control method of the hydraulic rescue lifting control system of the magnetic levitation vehicle according to claim 1, characterized by: In the method, in the non-rescue state, the hydraulic cylinder (2) piston rod is in the extended state, and when starting rescue, the piston rod is retracted, and the hydraulic cylinder (2) drives the rescue wheel to fall and lift the vehicle body.

3. The control method of the hydraulic rescue lifting control system of the magnetic levitation vehicle according to claim 1, characterized by: The oil supply pipe (33) is provided with an oil inlet filter (6) for filtering oil and a one-way valve (7) for preventing the pressure oil output by the oil pump (31) from flowing back to the oil tank (1). The oil supply pipe (33) is provided with a safety valve (8) for setting the maximum system pressure and preventing the motor (32) and the oil pump (31) from being overloaded on the pipeline between the oil pump (31) and the one-way valve (7). The other end of the safety valve (8) is provided with a connecting pipe connected to the oil tank (1).

4. The control method of the hydraulic rescue lifting control system of the magnetic levitation vehicle according to claim 1, characterized by: The oil tank (1) is provided with: a liquid level gauge (9) for detecting and observing the oil level in the oil tank (1); a breather (10) for balancing the air pressure in the oil tank (1).

5. The control method of the hydraulic rescue lifting control system of the magnetic levitation vehicle according to claim 1, characterized by: The lifting control system also includes an electrical connector for connecting an electronic rescue control unit, which is used for rescue instruction receiving, information feedback, drive motor controller and hydraulic rescue power unit, pressure detection, fault diagnosis. The motor (32) is controlled by the motor controller, which is used to receive the electronic rescue control unit signal and control the start and stop of the motor in the hydraulic rescue power unit, and feedback the working state of the motor (32) to the electronic rescue control unit.

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