Device and method for remotely controlling extension and retraction of undercarriage in rear cabin

Abstract

The invention belongs to the field of undercarriages, and relates to a device and method for remotely controlling extension and retraction of an undercarriage in a rear cabin. A pneumatic electromagnetic valve and a controller are additionally arranged on corresponding pipelines of switches of the front cabin undercarriage and the rear cabin undercarriage to realize a function of remotely controlling the operation of the rear cabin undercarriage on the ground. Compared with an existing device, the device has the advantages that an electromagnetic valve is simply and conveniently arranged on a pipeline, the additionally arranged electromagnetic valve occupies a small space and has small influence on the internal space of the test bed, and the configured controller is independent of the test bed and has no influence on the spatial layout of the test bed. The electromagnetic valve and the controller are combined to realize the control function of remotely controlling the undercarriage of the rear cabin on the ground.

Description

Technical Field

[0001] The invention belongs to the field of aircraft landing gears, and relates to a device and method for remotely controlling the retraction and extension of a landing gear in a rear cabin. Background Art

[0002] In the existing landing gear retraction and extension cooling system of a certain type of aircraft, the front and rear cabin landing gear retraction and extension switches are used to realize the landing gear retraction and extension function. Among them, the rear cabin landing gear switch is a double-acting switch. When the switch handle is in the neutral position, the front cabin pilot can perform the landing gear retraction and extension operation; if the front cabin landing gear is retracted or extended incorrectly, the rear cabin pilot can correct the error by placing the double-acting switch handle in the required position. At this time, the front cabin landing gear switch is disconnected from the cooling system, and the landing gear can only be retracted or extended by the rear cabin.

[0003] During demonstration and training, the front and rear cabins are operated by students and instructors respectively. During each demonstration and training, the instructor needs to frequently go on board to operate and get off the plane to explain. He also needs to observe the students' operation and the movement of the landing gear, and make judgments on each student's learning situation. This not only consumes a lot of time and energy, but also affects the teaching effect. The landing gear retraction and extension cooling system consists of a cooling air source, front and rear cabin landing gear retraction and extension switches, and a landing gear retraction and extension actuator. Summary of the invention

[0004] Purpose of the Invention

[0005] When conducting the aircraft landing system teaching and training system, in order to free the instructor in the rear cabin to operate, the instructor can better teach and demonstrate functions intuitively and clearly to many students on the ground. The present invention provides a device and method for remotely controlling the retraction and extension function of the landing gear in the rear cabin when the rear cabin landing gear switch handle is in a neutral state. The invention not only retains the original control functions of the front and rear cabin landing gears, but also can realize the control function of the rear cabin landing gear in the aircraft through ground remote control, thereby improving the teaching and training efficiency and effect.

[0006] Technical Solution

[0007] A device for remotely controlling the retraction and extension of a rear cabin landing gear, wherein a cold air source 1 is connected to an air supply connector 21 of a rear cabin landing gear switch 2, an air supply inlet of a rear cabin landing gear extension solenoid valve 3, and an air supply inlet of a rear cabin landing gear retraction solenoid valve 4.

[0008] The air supply connector 21 of the rear cabin landing gear switch 2 is connected to the cold air source 1, the rear cabin landing gear switch air outlet connector 22 is connected to the inlet of the front cabin air supply solenoid valve 6, the front cabin lowering pipe connector 23 is connected to the inlet of the front cabin lowering pipe solenoid valve 8, the rear cabin landing gear switch lowering connector 24 is connected to the landing gear retraction and extension actuator cylinder lowering chamber connector 121, the front cabin retraction pipe connector 25 is connected to the inlet of the front cabin retraction pipe solenoid valve 9, and the rear cabin landing gear switch retraction connector 26 is connected to the landing gear retraction and extension actuator cylinder retraction chamber connector 122.

[0009] The inlet of the rear cabin landing gear lowering solenoid valve 3 is connected to the cold air source 1, and the outlet of the rear cabin landing gear lowering solenoid valve 3 is respectively connected to the landing gear retraction and extension actuator lowering chamber connector 121 and the rear cabin landing gear switch lowering connector 24, and the rear cabin landing gear lowering solenoid valve 3 is electrically connected to the controller 5.

[0010] The inlet of the rear cabin landing gear retraction solenoid valve 4 is connected to the cold air source 1, and the outlet of the rear cabin landing gear retraction solenoid valve 4 is respectively connected to the landing gear retraction actuator cylinder retraction chamber connector 122 and the rear cabin landing gear switch retraction connector 26, and the rear cabin landing gear retraction solenoid valve 4 is electrically connected to the controller 5.

[0011] The controller 5 is electrically connected to the rear cabin landing gear lowering solenoid valve 3, the rear cabin landing gear retracting solenoid valve 4, the front cabin air supply solenoid valve 6, the front cabin lowering pipeline solenoid valve 8, the front cabin retracting pipeline solenoid valve 9, the lowering pipeline exhaust solenoid valve 10, and the retracting pipeline exhaust solenoid valve 11 respectively.

[0012] The air inlet of the front cabin air supply solenoid valve 6 is connected to the air outlet connector 22 of the rear cabin landing gear switch, the air outlet of the front cabin air supply solenoid valve 6 is connected to the air inlet connector 71 of the front landing gear switch, and the front cabin air supply solenoid valve 6 is electrically connected to the controller 5.

[0013] The front landing gear switch air inlet connector 71 in the front cabin landing gear switch 7 is connected to the air outlet of the front cabin air supply solenoid valve 6, the front landing gear switch lowering connector 72 is respectively connected to the outlet of the front cabin lowering pipeline solenoid valve 8 and the air inlet of the lowering pipeline exhaust solenoid valve 10, and the front landing gear switch retracting connector 73 is respectively connected to the outlet of the front cabin retracting pipeline solenoid valve 9 and the air inlet of the retracting pipeline exhaust solenoid valve 11.

[0014] The air inlet of the solenoid valve 8 for lowering the front cabin pipeline is connected to the front cabin lowering pipeline connector 23, and the air outlet of the solenoid valve 8 for lowering the front cabin pipeline is respectively connected to the front landing gear switch lowering connector 72 and the air inlet of the lowering pipeline exhaust solenoid valve 10, and the solenoid valve 8 for lowering the front cabin pipeline is electrically connected to the controller 5.

[0015] The inlet of the solenoid valve 9 for retracting the front cabin pipeline is connected to the front cabin pipeline connector 25, and the outlet of the solenoid valve 9 for retracting the front cabin pipeline is respectively connected to the air inlet of the retracting pipeline exhaust solenoid valve 11 and the front landing gear switch retracting connector 73, and the solenoid valve 9 for retracting the front cabin pipeline is electrically connected to the controller 5.

[0016] The inlet of the pipeline lowering exhaust solenoid valve 10 is respectively connected to the outlet of the pipeline lowering solenoid valve 8 to the front cabin and the front landing gear switch lowering connector 72, and the pipeline lowering exhaust solenoid valve 10 is electrically connected to the controller 5.

[0017] The inlet of the retracted pipeline exhaust solenoid valve 11 is respectively connected to the outlet of the retracted pipeline solenoid valve 9 to the front cabin and the retracted joint 73 of the front landing gear switch, and the retracted pipeline exhaust solenoid valve 11 is electrically connected to the controller 5.

[0018] The lowering chamber joint 121 of the landing gear retracting and extending actuator cylinder 12 is connected to the lowering joint 24 of the rear cabin landing gear switch, and the retracting chamber joint 122 of the landing gear retracting and extending actuator cylinder 12 is connected to the retracting joint 26 of the rear cabin landing gear switch.

[0019] A method for remotely controlling the retraction and extension of a landing gear in a rear cabin. When the rear cabin is remotely controlled to operate the retraction and extension of the landing gear on the ground, the handle of the rear cabin landing gear switch (2) is always in a neutral state. The controller (5) outputs a 24VDC control signal to the front cabin air supply solenoid valve (6), the normally open solenoid valve is energized, the valve of the solenoid valve is closed, the solenoid valve air circuit is disconnected, and the air circuit between the rear cabin landing gear switch air outlet connector (22) and the front landing gear switch air inlet connector (71) is cut off. The cold air source (1) supplies air pressure to the rear cabin landing gear switch air supply connector (21) and the air supply ports of the rear cabin landing gear extension solenoid valve (3) and the rear cabin landing gear retraction solenoid valve (4) through the connected pipeline, and the gas passes through the rear cabin landing gear switch air supply connector (21) and enters the rear cabin landing gear switch air outlet connector (22).

[0020] When the rear cabin is remotely controlled to lower the landing gear, the controller (5) outputs control signals to the rear cabin landing gear lowering solenoid valve (3), the front cabin lowering pipeline solenoid valve (8), and the retracting pipeline exhaust solenoid valve (11), respectively. The air circuits of the rear cabin landing gear lowering solenoid valve (3) and the retracting pipeline exhaust solenoid valve (11) are both connected, the solenoid valve (9) for the retracting pipeline of the front cabin continues to maintain the original air circuit connection state, and the front cabin lowering pipeline solenoid valve (8) is closed. After the rear cabin landing gear lowering solenoid valve (3) is connected, gas enters the lowering chamber of the landing gear lowering actuating cylinder (12) through the lowering chamber joint (121) of the landing gear lowering actuating cylinder; at the same time, gas in the upper chamber of the landing gear lowering actuating cylinder (12) enters the rear cabin landing gear switch upper chamber joint (26), the front cabin upper chamber joint (25), the front cabin upper chamber solenoid valve (9), and the upper chamber exhaust solenoid valve (11) in sequence through the landing gear lowering actuating cylinder upper chamber joint (122), thereby exhausting gas in the pipeline; gas in the pipeline between the front landing gear switch upper chamber joint (73) and the upper chamber exhaust solenoid valve (11) is also exhausted through the upper chamber exhaust solenoid valve (11), thereby realizing the rear cabin control landing gear lowering function.

[0021] When the rear cabin is remotely controlled to retract the landing gear, the controller (5) outputs control signals to the rear cabin landing gear retraction solenoid valve (4), the front cabin retraction pipeline solenoid valve (9), and the lowering pipeline exhaust solenoid valve (10), respectively. The rear cabin landing gear retraction solenoid valve (4) and the lowering pipeline exhaust solenoid valve (10) are both connected, the front cabin lowering pipeline solenoid valve (8) continues to maintain the original air circuit connection state, and the front cabin retraction pipeline solenoid valve (9) is closed. After the rear cabin landing gear retraction solenoid valve (4) is connected, gas enters the upper chamber of the landing gear retraction and extension actuating cylinder (12) through the upper chamber joint (122) of the landing gear retraction and extension actuating cylinder; at the same time, gas in the lowering chamber of the landing gear retraction and extension actuating cylinder (12) enters the rear cabin landing gear switch lowering joint (24), the front cabin lowering pipeline joint (23), the front cabin lowering pipeline solenoid valve (8), and the lowering pipeline exhaust solenoid valve (10) in sequence through the landing gear retraction and extension actuating cylinder lowering chamber joint (121), thereby exhausting gas in the pipeline, and gas in the pipeline between the front landing gear switch lowering joint (72) and the lowering pipeline exhaust solenoid valve (10) is also exhausted through the lowering pipeline exhaust solenoid valve (10), thereby realizing the rear cabin control landing gear retraction function.

[0022] Furthermore, when the rear cabin landing gear is retracted or extended by ground remote control, the handle of the rear cabin landing gear switch (2) is always in a neutral state.

[0023] Furthermore, the controller (5) outputs a control signal to the front cabin air supply solenoid valve (6), disconnects the solenoid valve air circuit, and cuts off the air circuit between the rear cabin landing gear switch air outlet connector (22) and the front landing gear switch air inlet connector (71).

[0024] Furthermore, the cold air source (1) supplies air pressure to the rear cabin landing gear switch air supply connector (21) and the air supply ports of the rear cabin landing gear lowering solenoid valve (3) and the rear cabin landing gear retracting solenoid valve (4) through the connected pipelines, and the gas passes through the rear cabin landing gear switch air supply connector (21) and then enters the rear cabin landing gear switch air outlet connector (22).

[0025] Furthermore, the front cabin air supply solenoid valve (6), the front cabin lowering pipeline solenoid valve (8), and the front cabin retracting pipeline solenoid valve (9) are two-position three-way one-in-one-out normally open solenoid valves. When the power is turned on, the valve of the solenoid valve is closed, and when the power is turned off, the valve of the solenoid valve is opened. The voltage supply pressure is (24±10%) VDC;

[0026] Furthermore, the rear cabin landing gear lowering solenoid valve (3), the rear cabin landing gear retracting solenoid valve (4), the lowering pipeline exhaust solenoid valve (10), and the retracting pipeline exhaust solenoid valve (11) are two-position three-way one-input one-output normally closed solenoid valves, the valves of the solenoid valves are opened when power is turned on, and the valves of the solenoid valves are closed when power is turned off, and the voltage supply is (24±10%) VDC;

[0027] Furthermore, the controller (5) may be a portable controller that is easy to carry, or may be a functional module embedded in the test bench measurement and control system;

[0028] Furthermore, the controller (5) should have electrical manual automatic control and software manual automatic control functions, the voltage control range should be adjustable within the range of 0 to 30 VDC, the control channels should be no less than 4, and the control progress should be better than 0.5%;

[0029] Furthermore, the rear cabin landing gear lowering solenoid valve (3), the rear cabin landing gear retracting solenoid valve (4), the front cabin air supply solenoid valve (6), the front cabin lowering pipeline solenoid valve (8), the front cabin retracting pipeline solenoid valve (9), the lowering pipeline exhaust solenoid valve (10), and the retracting pipeline exhaust solenoid valve (11) are solenoid valves whose working medium is air, and the air pressure range is within 6MPa;

[0030] Furthermore, the invention retains the original landing gear retraction and extension control method of the test bench while realizing the ground remote control rear cabin operation of the landing gear retraction and extension function, and has the advantage of redundancy. When one control method fails, it can be easily and quickly switched to another control method.

[0031] The beneficial effects of this application are:

[0032] The present invention provides a method for realizing a ground remote control rear cabin landing gear operating function by installing a pneumatic solenoid valve and configuring a controller on corresponding pipelines of front and rear cabin landing gear switches when a rear cabin landing gear switch handle is in a neutral state.

[0033] Compared with the existing device, this device is simple and convenient to install the solenoid valve on the pipeline. The installed solenoid valve takes up little space and has little impact on the internal space of the test bench. The configured controller is independent of the test bench and will not affect the spatial layout of the test bench. The combination of the solenoid valve and the controller realizes the ground remote control of the rear cabin landing gear operation function.

[0034] This method uses the remote manual automatic control of the electromagnetic valve on the ground to open and close, solving the problem of frequent switching of multiple scenes and multiple working conditions during teaching and training, where the instructor goes on board to operate, explains on board, observes the student's operation and the landing gear movement, and makes judgments on each student's learning situation. It saves the instructor's operation time and physical strength, and gives the instructor more time to explain to the students on site. At the same time, the instructor can more intuitively and clearly grasp the actual operation of the students on site, achieving the purpose of improving the efficiency and effect of teaching and training.

[0035] The present invention has the advantage of redundant control. When executing the ground remote control rear cabin landing gear operation function, the original control mode of the front and rear cabins of the test bench is retained. When one mode fails, it can be immediately switched to another mode for retraction and extension, avoiding the interruption of teaching and training and ensuring the continuation of training.

[0036] This technical solution is applicable to the ground remote control of the rear cabin landing gear operation of the test bench of the same type. It can also be extended to other types of test benches by properly adjusting and configuring the position, number, type and controller channel of the solenoid valve on the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is the system schematic diagram;

[0038] In the figure, 1. cold air source, 2. rear cabin landing gear switch, 21. rear cabin landing gear switch air supply connector, 22. rear cabin landing gear switch outlet connector, 23. front cabin lowering pipe connector, 24. rear cabin landing gear switch lowering connector, 25. front cabin retracting pipe connector, 26 rear cabin landing gear switch retracting connector, 3. rear cabin lowering solenoid valve, 4. rear cabin retracting solenoid valve, 5. controller, 6. front cabin air supply solenoid valve, 7. front cabin Landing gear switch, 71. Front landing gear switch air connector, 72. Front landing gear switch lowering connector, 73. Front landing gear switch retracting connector, 8. Front cabin lowering pipeline solenoid valve, 9. Front cabin retracting pipeline solenoid valve, 10. Lowering pipeline exhaust solenoid valve, 11. Retracting pipeline exhaust solenoid valve, 12. Landing gear retracting actuator, 121. Landing gear retracting actuator lowering chamber connector, 122. Landing gear retracting actuator retracting chamber connector. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail in combination with the embodiment of the present invention. In the example, the same or similar reference numerals throughout represent the same or similar originals or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of them. The embodiments described below by reference are exemplary and intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention. The following is a detailed description in combination with the embodiments of the present invention.

[0040] In order to improve the efficiency and effect of landing gear teaching and training, the invention structurally installs pneumatic solenoid valves on the corresponding pipelines of the front and rear cabin landing gear switches; the controller is composed of a pressure supply, a valve control component, a control program, etc., and is connected to each solenoid valve for electrical signals.

[0041] In order to improve the efficiency and effect of landing gear teaching and training. In terms of structure, the invention installs a normally open pneumatic solenoid valve on the pipeline between the outlet joint of the rear cabin landing gear switch and the inlet joint of the front landing gear switch, the pipeline joint for lowering the front cabin and the lowering joint of the front landing gear switch, and the pipeline joint for retracting the front cabin and the retracting joint of the front landing gear switch; installs a normally closed pneumatic solenoid valve on the pipeline close to the lowering joint of the front landing gear switch and the retracting joint of the front landing gear switch respectively; installs a normally closed pneumatic solenoid valve on the pipeline where the cold air source and the lowering chamber joint of the landing gear retracting actuator cylinder and the retracting chamber joint of the cold air source and the retracting chamber joint of the landing gear retracting actuator cylinder are located; the controller is composed of a pressure supply, a valve control component, a control program, etc., and is connected to each solenoid valve for electrical signals.

[0042] The method provides the air pressure required for retracting and extending the landing gear through a cold air source; when the rear cabin landing gear switch handle is kept in a neutral position, a signal is sent through a controller to control the on and off of the air circuit solenoid valve, so that the gas in the cold air source passes through the rear cabin landing gear lowering solenoid valve (rear cabin landing gear retraction solenoid valve) and the landing gear retraction and extension actuator lowering chamber (landing gear retraction and extension actuator upper chamber) in sequence; at the same time, the gas in the landing gear retraction and extension actuator upper chamber (landing gear retraction and extension actuator lowering chamber) enters the front cabin retraction pipeline solenoid valve (front cabin lowering pipeline solenoid valve) and the retraction pipeline exhaust solenoid valve (lowering pipeline exhaust solenoid valve) in sequence to discharge the gas in the corresponding pipelines.

[0043] The present invention is a device and method for realizing the ground remote control of the rear cabin landing gear operation function, which is composed of a cold air source, a front and rear cabin landing gear retraction and extension switch, a pneumatic solenoid valve, a controller, a landing gear retraction and extension cylinder, etc. The principle diagram of the system is shown in Figure 1 .

[0044] When the rear cabin landing gear is retracted or extended by ground remote control, the handle of the rear cabin landing gear switch (2) is always in a neutral state. The controller (5) outputs a 24VDC control signal to the front cabin air supply solenoid valve (6), the normally open solenoid valve is energized, the valve of the solenoid valve is closed, the solenoid valve air circuit is disconnected, and the air circuit between the rear cabin landing gear switch outlet connector (22) and the front landing gear switch inlet connector (71) is cut off. The cold air source (1) supplies air pressure to the rear cabin landing gear switch air supply connector (21) and the air supply ports of the rear cabin landing gear extension solenoid valve (3) and the rear cabin landing gear retraction solenoid valve (4) through the connected pipeline, and the gas enters the rear cabin landing gear switch outlet connector (22) after passing through the rear cabin landing gear switch air supply connector (21).

[0045] When the rear cabin remotely controls the landing gear to be lowered, the controller (5) outputs a 24VDC control signal to the rear cabin landing gear lowering solenoid valve (3), the front cabin lowering pipeline solenoid valve (8), and the retracting pipeline exhaust solenoid valve (11). The rear cabin landing gear lowering solenoid valve (3), which is a normally closed solenoid valve, is energized at this time, the valve of the solenoid valve is opened, and the solenoid valve gas circuit is connected; the front cabin retracting pipeline solenoid valve (9), which is a normally open solenoid valve, is not energized, and the valve of the solenoid valve is still in the open state, and the original gas circuit connection state is maintained; the front cabin lowering pipeline solenoid valve (8), which is a normally open solenoid valve, is energized at this time, the valve of the solenoid valve is closed, and the solenoid valve gas circuit is disconnected. After the rear cabin landing gear lowering solenoid valve (3) is connected, gas enters the lowering chamber of the landing gear lowering actuating cylinder (12) through the lowering chamber joint (121) of the landing gear lowering actuating cylinder; at the same time, gas in the upper chamber of the landing gear lowering actuating cylinder (12) enters the rear cabin landing gear switch upper chamber joint (26), the front cabin upper chamber joint (25), the front cabin upper chamber solenoid valve (9), and the upper chamber exhaust solenoid valve (11) in sequence through the landing gear lowering actuating cylinder upper chamber joint (122), thereby exhausting gas in the pipeline; gas in the pipeline between the front landing gear switch upper chamber joint (73) and the upper chamber exhaust solenoid valve (11) is also exhausted through the upper chamber exhaust solenoid valve (11), thereby realizing the rear cabin control landing gear lowering function.

[0046] When the rear cabin remotely controls the landing gear to be retracted, the controller (5) outputs a 24VDC control signal to the rear cabin landing gear retracting solenoid valve (4), the front cabin retracting pipeline solenoid valve (9), and the lowering pipeline exhaust solenoid valve (10). The rear cabin landing gear retracting solenoid valve (4), which is a normally closed solenoid valve, is energized at this time, the valve of the solenoid valve is opened, and the solenoid valve gas circuit is connected; the front cabin lowering pipeline solenoid valve (8), which is a normally open solenoid valve, is not energized, and the valve of the solenoid valve is still in an open state, and the original gas circuit connection state is maintained; the front cabin retracting pipeline solenoid valve (9), which is a normally open solenoid valve, is energized at this time, the valve of the solenoid valve is closed, and the solenoid valve gas circuit is disconnected. After the rear cabin landing gear retraction solenoid valve (4) is connected, gas enters the upper chamber of the landing gear retraction and extension actuating cylinder (12) through the upper chamber joint (122) of the landing gear retraction and extension actuating cylinder; at the same time, gas in the lowering chamber of the landing gear retraction and extension actuating cylinder (12) enters the rear cabin landing gear switch lowering joint (24), the front cabin lowering pipeline joint (23), the front cabin lowering pipeline solenoid valve (8), and the lowering pipeline exhaust solenoid valve (10) in sequence through the landing gear retraction and extension actuating cylinder lowering chamber joint (121), thereby exhausting gas in the pipeline, and gas in the pipeline between the front landing gear switch lowering joint (72) and the lowering pipeline exhaust solenoid valve (10) is also exhausted through the lowering pipeline exhaust solenoid valve (10), thereby realizing the rear cabin control landing gear retraction function.

[0047] It is understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and unless defined as here, will not be interpreted with idealized or overly formal meanings. The specific implementation methods described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Within the spirit and principle of the present invention, any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment of equivalent changes for application in other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution content of the present invention, any modification, equivalent replacement, improvement, etc., made according to the technical essence of the present invention, should be included in the protection scope of the present invention.

Claims

1. A device for remotely controlling the retraction and extension of landing gear in a rear cabin, characterized in that: The cold air source is connected to the air supply connector of the rear cabin landing gear switch, the air supply inlet of the rear cabin landing gear lowering solenoid valve, and the air supply inlet of the rear cabin landing gear retracting solenoid valve; The air supply connector of the rear cabin landing gear switch is connected to the cold air source, the air outlet connector of the rear cabin landing gear switch is connected to the inlet of the front cabin air supply solenoid valve, the front cabin lowering pipeline connector is connected to the inlet of the front cabin lowering pipeline solenoid valve, the rear cabin landing gear switch lowering connector is connected to the landing gear retraction and extension actuator cylinder lowering chamber connector, the front cabin retraction pipeline connector is connected to the inlet of the front cabin retraction pipeline solenoid valve, and the rear cabin landing gear switch retraction connector is connected to the landing gear retraction and extension actuator cylinder retraction chamber connector; The inlet of the rear cabin landing gear lowering solenoid valve is connected to the cold air source, the outlet of the rear cabin landing gear lowering solenoid valve is respectively connected to the lowering chamber joint of the landing gear retracting and lowering actuator cylinder and the lowering joint of the rear cabin landing gear switch, and the rear cabin landing gear lowering solenoid valve is electrically connected to the controller; The inlet of the rear cabin landing gear retraction solenoid valve is connected to the cold air source, the outlet of the rear cabin landing gear retraction solenoid valve is respectively connected to the retraction cavity joint of the landing gear retraction and extension actuator cylinder and the retraction joint of the rear cabin landing gear switch, and the rear cabin landing gear retraction solenoid valve is electrically connected to the controller; The controller is electrically connected to the rear cabin landing gear lowering solenoid valve, the rear cabin landing gear retracting solenoid valve, the front cabin air supply solenoid valve, the front cabin lowering pipeline solenoid valve, the front cabin retracting pipeline solenoid valve, the lowering pipeline exhaust solenoid valve, and the retracting pipeline exhaust solenoid valve respectively; The air inlet of the front cabin air supply solenoid valve is connected to the air outlet connector of the rear cabin landing gear switch, the air outlet of the front cabin air supply solenoid valve is connected to the air inlet connector of the front landing gear switch, and the front cabin air supply solenoid valve is electrically connected to the controller; The front landing gear switch air inlet connector of the front cabin landing gear switch is connected to the air outlet of the front cabin air supply solenoid valve, the front landing gear switch lowering connector is respectively connected to the outlet of the front cabin lowering pipeline solenoid valve and the air inlet of the lowering pipeline exhaust solenoid valve, and the front landing gear switch retracting connector is respectively connected to the outlet of the front cabin retracting pipeline solenoid valve and the air inlet of the retracting pipeline exhaust solenoid valve; The air inlet of the electromagnetic valve for lowering the pipeline to the front cabin is connected to the joint of the pipeline to lower the front cabin, the air outlet of the electromagnetic valve for lowering the pipeline to the front cabin is respectively connected to the lowering joint of the front landing gear switch and the air inlet of the exhaust electromagnetic valve of the lowering pipeline, and the electromagnetic valve for lowering the pipeline to the front cabin is electrically connected to the controller; The inlet of the solenoid valve for the retracted pipeline to the front cabin is connected to the joint of the retracted pipeline to the front cabin, the outlet of the solenoid valve for the retracted pipeline to the front cabin is respectively connected to the air inlet of the exhaust solenoid valve of the retracted pipeline and the retracted joint of the front landing gear switch, and the solenoid valve for the retracted pipeline to the front cabin is electrically connected to the controller; The inlet of the lowering pipeline exhaust solenoid valve is respectively connected to the outlet of the lowering pipeline solenoid valve to the front cabin and the lowering joint of the front landing gear switch, and the lowering pipeline exhaust solenoid valve is electrically connected to the controller; The inlet of the retracted pipeline exhaust solenoid valve is respectively connected to the outlet of the retracted pipeline solenoid valve to the front cabin and the retracted joint of the front landing gear switch, and the retracted pipeline exhaust solenoid valve is electrically connected to the controller; The lowering chamber joint of the landing gear retracting and extending actuator cylinder is connected to the lowering joint of the landing gear switch in the rear cabin, and the retracting chamber joint of the landing gear retracting and extending actuator cylinder is connected to the retracting joint of the landing gear switch in the rear cabin.

2. The method for retracting and unfolding the device according to claim 1, characterized in that: When the rear cabin landing gear is retracted or extended by ground remote control, the rear cabin landing gear switch handle is always in a neutral state; the controller outputs a 24VDC control signal to the front cabin air supply solenoid valve, the normally open solenoid valve is energized, the solenoid valve valve is closed, the solenoid valve air circuit is disconnected, and the air circuit between the rear cabin landing gear switch outlet joint and the front landing gear switch inlet joint is cut off; the cold air source supplies air pressure to the rear cabin landing gear switch air supply joint and the rear cabin landing gear extension solenoid valve and the rear cabin landing gear retraction solenoid valve at the same time through the connected pipeline, and the gas passes through the rear cabin landing gear switch air supply joint and then enters the rear cabin landing gear switch air outlet joint; When the ground remote control rear cabin controls the landing gear to be lowered, the controller outputs control signals to the rear cabin landing gear lowering solenoid valve, the front cabin lowering pipeline solenoid valve, and the retracting pipeline exhaust solenoid valve. The air circuits of the rear cabin landing gear lowering solenoid valve and the retracting pipeline exhaust solenoid valve are connected, the solenoid valve of the front cabin retracting pipeline continues to maintain the original air circuit connection state, and the front cabin lowering pipeline solenoid valve is closed; after the rear cabin landing gear lowering solenoid valve is connected, the gas enters the landing gear through the lowering chamber joint of the landing gear retracting and extending actuator cylinder. At the same time, the gas in the retracting cavity of the landing gear retracting actuator cylinder enters the retracting joint of the landing gear switch in the rear cabin, the retracting pipe joint to the front cabin, the retracting pipe solenoid valve to the front cabin, and the retracting pipe exhaust solenoid valve in turn through the retracting cavity joint of the landing gear retracting actuator cylinder, and exhausts the gas in the pipeline. The gas in the pipeline between the retracting joint of the front landing gear switch and the retracting pipe exhaust solenoid valve is also exhausted through the retracting pipe exhaust solenoid valve, thereby realizing the rear cabin control landing gear lowering function; When the rear cabin is remotely controlled to retract the landing gear, the controller outputs control signals to the rear cabin landing gear retraction solenoid valve, the front cabin retraction pipeline solenoid valve, and the lowering pipeline exhaust solenoid valve respectively, and the rear cabin landing gear retraction solenoid valve and the lowering pipeline exhaust solenoid valve are all connected, the front cabin lowering pipeline solenoid valve continues to maintain the original gas circuit connection state, and the front cabin retraction pipeline solenoid valve is closed; after the rear cabin landing gear retraction solenoid valve is connected, the gas enters the landing gear retraction and extension actuator cylinder retraction upper cavity through the landing gear retraction and extension actuator cylinder retraction cavity joint; at the same time, the gas in the lowering cavity of the landing gear retraction and extension actuator cylinder enters the rear cabin landing gear switch lowering joint, the front cabin lowering pipeline joint, the front cabin lowering pipeline solenoid valve, and the lowering pipeline exhaust solenoid valve in sequence through the landing gear retraction and extension actuator cylinder lowering cavity joint, and the gas in the pipeline is discharged, and the gas in the pipeline between the front landing gear switch lowering joint and the lowering pipeline exhaust solenoid valve is also discharged through the lowering pipeline exhaust solenoid valve, thereby realizing the rear cabin control landing gear retraction function.

3. The method for retracting and releasing as claimed in claim 2, characterized in that: When the rear cabin landing gear is retracted or extended by ground remote control, the rear cabin landing gear switch handle is always in the neutral position.

4. The method for retracting and releasing as claimed in claim 3, characterized in that: The controller outputs a control signal to the front cabin air supply solenoid valve, disconnects the solenoid valve air circuit, and cuts off the air circuit between the rear cabin landing gear switch air outlet connector and the front landing gear switch air inlet connector.

5. The method for retracting and releasing as claimed in claim 4, characterized in that: The cold air source supplies air pressure to the rear cabin landing gear switch air supply connector and the air supply ports of the rear cabin landing gear lowering solenoid valve and the rear cabin landing gear retracting solenoid valve through the connected pipelines. The gas passes through the rear cabin landing gear switch air supply connector and then enters the rear cabin landing gear switch air outlet connector.

6. The method for retracting and releasing as claimed in claim 5, characterized in that: The front cabin air supply solenoid valve, the front cabin lowering pipeline solenoid valve, and the front cabin retracting pipeline solenoid valve are two-position three-way one-in-one-out normally open solenoid valves. When power is turned on, the valve of the solenoid valve is closed, and when power is turned off, the valve of the solenoid valve is opened. The voltage supply is 24±10% VDC.

7. The method for retracting and releasing according to claim 6, characterized in that: The rear cabin landing gear lowering solenoid valve, the rear cabin landing gear retracting solenoid valve, the pipeline lowering exhaust solenoid valve, and the pipeline retracting exhaust solenoid valve are two-position three-way one-in-one-out normally closed solenoid valves. When power is turned on, the valve of the solenoid valve opens, and when power is turned off, the valve of the solenoid valve closes, and the voltage supply is 24±10% VDC.

8. The method for retracting and releasing according to claim 7, characterized in that: The controller can be a portable controller that is easy to carry, or it can be a functional module embedded in the test bench measurement and control system.

9. The method for retracting and releasing according to claim 8, characterized in that: The controller should have the functions of electrical manual automatic control and software manual automatic control, the voltage control range should be adjustable within the range of 0 to 30 VDC, the control channels should be no less than 4, and the control progress should be better than 0.5%.

10. The method for retracting and releasing according to claim 9, characterized in that: The rear cabin landing gear lowering solenoid valve, the rear cabin landing gear retracting solenoid valve, the front cabin air supply solenoid valve, the front cabin lowering pipeline solenoid valve, the front cabin retracting pipeline solenoid valve, the lowering pipeline exhaust solenoid valve, and the retracting pipeline exhaust solenoid valve are solenoid valves whose working medium is air, and the air pressure range is within 6MPa.

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