CN-121976983-A - Magnetic suspension train landing gear control system based on array type combined valve

CN121976983ACN 121976983 ACN121976983 ACN 121976983ACN-121976983-A

Abstract

The invention provides a maglev train landing gear control system based on an array type combined valve, and belongs to the technical field of rail transit vehicle brake control; the system is applied to a maglev train in a strong magnetic field environment and comprises an oil source device, at least one landing gear control device, an array type combined valve and a control device, wherein the at least one landing gear control device is arranged on a suspension frame of the maglev train and comprises at least one landing gear actuating cylinder for driving the landing gear to extend or retract, the array type combined valve is connected between the oil source device and the landing gear actuating cylinder and comprises a plurality of switch type electromagnetic valves, and pressure oil is controlled to enter or be discharged out of different working cavities of the landing gear actuating cylinder by controlling the combination of power-on and power-off states of the switch type electromagnetic valves so as to extend or retract the landing gear. The invention aims to solve the technical problems that the existing hydraulic control system for the undercarriage of the maglev train is poor in reliability, easy to leak and block in a strong magnetic field environment, and short in maintenance period.

Inventors

ZHOU HAO
WANG JIANGTAO
LI XIAOMENG
WANG DONGFENG

Assignees

西安航空制动科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260311

Claims (10)

1. Magnetic suspension train undercarriage control system based on array combination valve is applied to the magnetic suspension train under the strong magnetic field environment, and its characterized in that includes: The oil source device is used for storing and providing pressure oil for the system; At least one landing gear control device mounted on a levitation frame of a magnetic levitation train, each landing gear control device comprising: At least one landing gear ram for driving extension or retraction of the landing gear; the array type combined valve is connected between the oil source device and the landing gear actuating cylinder and consists of a plurality of switch type electromagnetic valves, and pressure oil is controlled to enter or exit different working cavities of the landing gear actuating cylinder by controlling the combination of power-on and power-off states of the switch type electromagnetic valves so as to realize the extension or retraction of the landing gear; The oil way connection relation of the array type combined valve is configured to have a failure safety function, and when the system is powered off, the array type combined valve automatically communicates the working cavity of the landing gear actuating cylinder with the oil return way, so that the landing gear can be put down by gravity emergency.
2. The maglev train landing gear control system of claim 1, wherein the array of combination valves comprises a landing gear control combination valve for controlling a single landing gear actuator; the landing gear control combination valve comprises a first normally closed electromagnetic valve, a second normally closed electromagnetic valve, a first normally open electromagnetic valve and a second normally open electromagnetic valve; the landing gear control combination valve is provided with a first oil port, a second oil port, a third oil port and a fourth oil port, wherein the first oil port is connected with an oil supply path of the oil source device, the second oil port is connected with an oil return path of the oil source device, the third oil port is connected with a rodless cavity of the landing gear actuating cylinder, and the fourth oil port is connected with a rod cavity of the landing gear actuating cylinder; the first normally closed electromagnetic valve is connected between the first oil port and the fourth oil port, the second normally closed electromagnetic valve is connected between the first oil port and the third oil port, the first normally open electromagnetic valve is connected between the second oil port and the third oil port, and the second normally open electromagnetic valve is connected between the second oil port and the fourth oil port.
3. The maglev train landing gear control system of claim 1, wherein each landing gear control device further comprises: at least one uplock actuator for locking or unlocking the landing gear in a retracted state; At least one down lock actuator for locking or unlocking the landing gear in an extended state; The hydraulic lock control combination valve consists of a plurality of switch-type electromagnetic valves, is connected between the oil source device and the upper lock actuator cylinder and between the oil source device and the lower lock actuator cylinder, and is used for controlling the unlocking of the upper lock actuator cylinder and the lower lock actuator cylinder; The pressure reducing valve is arranged on the oil supply pipeline between the oil source device and the hydraulic lock control combination valve and is used for reducing the oil supply pressure to a preset pressure value required by the lock actuator cylinder.
4. The maglev train landing gear control system of claim 3, wherein the hydraulic lock control combination valve comprises a third normally closed solenoid valve and a fourth normally closed solenoid valve; The hydraulic lock control combination valve is provided with a fifth oil port, a sixth oil port and a seventh oil port, the fifth oil port is connected with an oil supply path of the oil source device through a pressure reducing valve, the sixth oil port is connected with an oil return path of the oil source device, and the seventh oil port is connected with a control cavity of the upper lock actuator cylinder or the lower lock actuator cylinder; The third normally closed electromagnetic valve is connected between the fifth oil port and the seventh oil port, and the fourth normally closed electromagnetic valve is connected between the sixth oil port and the seventh oil port.
5. The maglev train landing gear control system of claim 4, wherein each landing gear control device further comprises a balance valve, wherein the balance valve is arranged between a rodless cavity oil way and a rod cavity oil way of the landing gear actuator cylinder and used for throttling oil return of the actuator cylinder in a liquid control mode when the array combination valve is used for controlling the opening and closing of the array combination valve so as to resist pressure impact caused by abrupt load change and ensure stable running of the landing gear.
6. The maglev train landing gear control system of claim 5, wherein each landing gear control device further comprises a plurality of pressure sensors respectively arranged on a rodless cavity oil circuit, a rod cavity oil circuit and a control cavity oil circuit of the landing gear actuator cylinder for monitoring the pressure of each oil circuit in real time.
7. The maglev train landing gear control system based on the array type combined valve of claim 1, wherein the control system comprises a plurality of landing gear control devices which are respectively arranged on two sides of the same suspension frame of the maglev train and are used for independently controlling landing gears on the two sides so as to realize the balance and the layout symmetry of the load of the train body.
8. The maglev train landing gear control system of claim 1, wherein the oil source device comprises: The oil tank is used for storing control oil required by the control of the landing gear system; a motor and a hydraulic pump driven by the motor for sucking oil from the oil tank; The accumulator is arranged at the outlet of the hydraulic pump and used for storing pressure oil and providing a pressure oil source for the landing gear control system; And the check valve is arranged between the hydraulic pump and the pressure accumulator and is used for preventing the oil in the pressure accumulator from reversely flowing back.
9. A method of controlling landing gear of a maglev train based on the system of any one of claims 1-8, comprising the landing gear extension control step of: Step 1, after receiving an undercarriage extension instruction, controlling a normally closed electromagnetic valve corresponding to a hydraulic lock control combination valve to be electrically opened, so that pressure oil subjected to depressurization by a pressure reducing valve enters a rodless cavity of a corresponding upper lock actuating cylinder to drive an upper lock to be unlocked; step 2, controlling a normally closed electromagnetic valve connected with a rodless cavity of the landing gear actuating cylinder in the array type combined valve to be electrically opened, and simultaneously controlling a normally open electromagnetic valve connected with the rodless cavity to be electrically closed, so that pressure oil enters the rodless cavity of the landing gear actuating cylinder, oil in the rod cavity returns through the array type combined valve, and the landing gear is driven to extend; and 3, after the landing gear stretches out to the right, controlling all electromagnetic valves in the array type combined valve to lose electricity, enabling two cavities of the landing gear actuating cylinder to be communicated with an oil return channel, simultaneously controlling a normally closed electromagnetic valve in the hydraulic lock control combined valve to be opened by electricity, enabling oil in a rodless cavity of the lock actuating cylinder to return oil, and enabling the lock actuating cylinder to retract under the action of a return spring to lock the landing gear at the stretching position.
10. A method of controlling landing gear of a maglev train based on the system of any one of claims 1-8, comprising the step of controlling landing gear retraction: Step 1, after receiving an undercarriage retraction instruction, controlling a normally closed electromagnetic valve corresponding to a hydraulic lock control combination valve to be electrically opened, so that pressure oil after being depressurized by a pressure reducing valve enters a rodless cavity of a corresponding lower lock actuating cylinder to drive a lower lock to be unlocked; Step 2, controlling a normally closed electromagnetic valve connected with a rod cavity of the landing gear actuating cylinder in the array type combined valve to be electrically opened, and simultaneously controlling a normally open electromagnetic valve connected with the rod cavity to be electrically closed, so that pressure oil enters the rod cavity of the landing gear actuating cylinder, oil in a rodless cavity returns through the array type combined valve, and the landing gear is driven to be retracted; And 3, after the undercarriage is retracted, controlling all electromagnetic valves in the array type combined valve to lose electricity, enabling two cavities of the undercarriage actuating cylinder to be communicated with an oil return channel, and simultaneously controlling a normally closed electromagnetic valve in the hydraulic lock control combined valve to be opened by electricity, enabling oil in a rodless cavity of the lock actuating cylinder to return oil, and enabling the lock actuating cylinder to retract under the action of a return spring, so that the undercarriage is locked at a retracted position.

Description

Magnetic suspension train landing gear control system based on array type combined valve Technical Field The invention belongs to the technical field of rail transit vehicle brake control, and particularly relates to a magnetic levitation train landing gear control system based on an array type combined valve. Background The magnetic suspension train is a novel rail transportation tool, and has the advantages of high speed, good comfort and strong loading capacity compared with the common rail transportation tool. When the magnetic levitation train runs at a high speed, the train is not in direct contact with the track, but is levitated in the air by means of magnetic force generated between the train and the track. In order to ensure the support and stable running of the train in the low-speed and braking stage, the magnetic levitation vehicle is provided with a landing gear device. At present, high-speed magnetic levitation trains are not put into commercial operation yet and still are in a technical research stage. In the prior art, the landing gear control system of the magnetic levitation train mainly selects a hydraulic control system, and utilizes the advantages of high power density, high control precision and high response speed of the hydraulic system to realize the accurate control of the landing gear of the magnetic levitation train and ensure the stable running of the vehicle. In the existing magnetic levitation train landing gear control scheme, the extension and retraction control of the landing gear is mainly realized by using a proportional reversing valve. However, the proportional reversing valve is easily affected by impurities in oil liquid, so that the proportional reversing valve is blocked, and the function is lost. Meanwhile, a complex signal amplifying circuit is required to be arranged on the proportional reversing valve in use, and a magnetism isolating shield is required to be arranged in order to adapt to the use environment of a strong magnetic field. In addition, the proportional reversing valve realizes oil reversing by using the movement of the cylindrical slide valve, and the internal leakage is larger due to the existence of a slide valve gap, so that the control system is required to be continuously supplemented with oil, and the oil in the accumulator can meet the required working times. The above reasons lead to the prior art solutions, in which the composition of the hydraulic system is complex, the volume and weight are large and the reliability is not high. Therefore, a new solution is needed to solve the above problems. Disclosure of Invention The technical problems to be solved are as follows: In order to avoid the defects of the prior art, the invention provides a magnetic suspension train landing gear control system which is suitable for a strong magnetic environment, has high reliability and long maintenance-free period, and uses an array type combined valve consisting of a plurality of switch type electromagnetic valves (normally open/normally closed) to replace a traditional proportional reversing valve so as to realize the control of a landing gear actuator cylinder and a hydraulic lock. The invention aims to solve the technical problems that the existing hydraulic control system for the undercarriage of the maglev train is poor in reliability, easy to leak and block in a strong magnetic field environment, and short in maintenance period. The invention has the technical scheme that the maglev train undercarriage control system based on the array type combined valve is applied to a maglev train in a strong magnetic field environment and comprises the following components: The oil source device is used for storing and providing pressure oil for the system; At least one landing gear control device mounted on a levitation frame of a magnetic levitation train, each landing gear control device comprising: At least one landing gear ram for driving extension or retraction of the landing gear; the array type combined valve is connected between the oil source device and the landing gear actuating cylinder and consists of a plurality of switch type electromagnetic valves, and pressure oil is controlled to enter or exit different working cavities of the landing gear actuating cylinder by controlling the combination of power-on and power-off states of the switch type electromagnetic valves so as to realize the extension or retraction of the landing gear; The oil way connection relation of the array type combined valve is configured to have a failure safety function, and when the system is powered off, the array type combined valve automatically communicates the working cavity of the landing gear actuating cylinder with the oil return way, so that the landing gear can be put down by gravity emergency. The array type combined valve comprises a landing gear control combined valve for controlling a single landing gear actuator cylinder; the landing gear control combination v