Folding type helicopter blade folding remote control operation control box and method

Abstract

The invention belongs to the field of hydraulic control, and relates to a folding remote control operation control box and method for a folding helicopter blade. Comprising a remote control box body, a remote controller, a main / tail rotor folding connecting wire harness and a folding control circuit, the remote control box body is divided into an upper layer and a lower layer, the lower layer accommodates a folding control circuit, the upper layer is divided into a storage area and a control panel area, the storage area is used for placing a remote controller and a main / tail rotor folding connecting wire harness, and the control panel area is provided with a main rotor folding adapter socket, a tail rotor folding adapter socket, an indicating lamp, a switch and an electric quantity / voltage indicating panel; eight keys are arranged on a remote controller panel and used for controlling a folding hydraulic system main valve switch, sudden stop, main paddle folding, main paddle unfolding, tail paddle pin pulling, tail paddle pin mounting, tail paddle folding and tail paddle unfolding respectively.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic control and relates to a remote control box and method for folding a foldable helicopter blade. Background Art

[0002] The blade folding system and tail rotor transmission parts of a foldable helicopter need to be disassembled, installed, and tested for performance. One or more solenoid valves of the blade folding system need to be operated separately. The solenoid valve can be operated separately by a DC power supply with a voltage of 24±5V, or by a mechanical button on the solenoid valve that forces the valve to open. All the above operations require one person to command and multiple people to cooperate. A dedicated person is responsible for powering on / off the corresponding solenoid valve or pressing / releasing the mechanical button. The coordination of the work is difficult and there are safety risks. Therefore, a remote control operation control box and method for the folding of the blades of a foldable helicopter are designed. Only one person is required to operate all the work through a remote control. During the operation, the abnormal situation of the blade folding process can be observed at any position on the aircraft and its surroundings, which greatly improves the safety of the operation. Summary of the invention

[0003] Purpose of the invention: When the main tail rotor folding electrical system is not in a complete state, the present invention is used to directly operate the hydraulic solenoid valve switch related to the folding system through the power supply of the control box and the remote control, so as to achieve the effect of controlling the folding hydraulic system to work independently.

[0004] Technical Solution

[0005] In a first aspect, a foldable helicopter blade folding remote control operation control box is provided, comprising:

[0006] Remote control box body, remote control, main / tail rotor folding connection harness, folding control circuit;

[0007] The remote control box is divided into two layers, the lower layer contains the folding control circuit, and the upper layer is divided into a storage area and a control panel area. The storage area is used to place the remote control and the main / tail propeller folding connection harness, and the control panel area is provided with a main propeller folding adapter socket, a tail propeller folding adapter socket, indicator lights, switches, and a power / voltage indicator panel.

[0008] There are 8 buttons on the remote control panel, which are used to control the main valve switch of the folding hydraulic system, emergency stop, main rotor folding, main rotor deployment, tail rotor pin removal, tail rotor pin placement, tail rotor folding and tail rotor deployment;

[0009] The folding control circuit is used to receive the key commands of the remote controller, and control the solenoid valve switch of the folding hydraulic system of the folding helicopter according to the key commands, so as to realize the main valve switch, emergency stop, main rotor folding, main rotor deployment, tail rotor pin removal, tail rotor pin placement, tail rotor folding and tail rotor deployment of the folding hydraulic system of the folding helicopter;

[0010] The main / tail rotor folding connection harness is used to connect to the corresponding hydraulic solenoid valve on a folding helicopter through the main / tail rotor folding adapter socket.

[0011] Further, the folding control circuit includes a battery, a fuel gauge, an indicator light, an eight-way remote control controller, a switch, a first positive parallel branching module, a second positive parallel branching module, and a negative parallel branching module;

[0012] The positive electrode of the battery is connected to the positive electrode of the electricity meter through the switch and the first positive parallel branching module, and is also connected to the positive terminal of the control power supply and the emergency stop control input of the eight-way remote control controller respectively; the red light input of the indicator light is connected to the normally open output of the emergency stop control of the eight-way remote control controller; the normally closed output of the emergency stop control of the eight-way remote control controller is connected to the main valve switch control input of the folding hydraulic system, the main propeller folding input, the main propeller deployment input, the tail propeller pin pulling input, the tail propeller pin input, the tail propeller folding input, the tail propeller deployment input and the main propeller folding adapter socket through the second positive parallel branching module. The main valve switch controls the normally open output terminal, the main propeller folding normally open output terminal, and the main propeller unfolding normally open output terminal, respectively, and are connected to different input interfaces of the main propeller folding adapter socket; the tail propeller pin pull-out normally open output terminal, the tail propeller upper pin normally open output terminal, the tail propeller folding normally open output terminal, and the tail propeller unfolding normally open output terminal are respectively connected to different input interfaces of the tail propeller folding adapter socket; the negative terminal of the control power supply of the eight-way remote control controller, the negative terminal of the electricity meter, the negative terminal of the indicator light, and all the negative terminal interfaces of the main / tail propeller folding adapter sockets are connected to the negative terminal of the battery through the negative parallel distribution module and the switch.

[0013] Furthermore, the control box connects the main / tail rotor folding connection harness to the control box as required, and the tail rotor folding connection harness is connected to the helicopter tail rotor pull / pin-up hydraulic solenoid valve and the tail rotor folding / deployment hydraulic solenoid valve; the main rotor folding connection harness is connected to the helicopter main rotor main hydraulic solenoid valve, the main rotor folding / deployment hydraulic solenoid valve and the main rotor folding accumulator.

[0014] Furthermore, the control panel area is also provided with a charging interface for charging the battery, and the storage area is also used to accommodate the battery charger.

[0015] Furthermore, the fuel gauge is used to identify the remaining power percentage and current voltage of the detection battery and display them through the power / voltage indicator panel.

[0016] Furthermore, the main valve button and the emergency stop button are self-locking controls, that is, they are connected when pressed once and released, and disconnected when pressed again and released. The remaining buttons are inching controls, that is, they are connected when pressed and disconnected when released; the indicator light on the remote control flashes when any button is operated alone.

[0017] Furthermore, when the control box is turned on, the green indicator light is on, the emergency stop button is pressed once, the indicator light should turn red, the emergency stop button is pressed again, the indicator light turns green, and when the indicator light turns red, the functions of the other keys will be invalid.

[0018] In a second aspect, a remote control method for folding a foldable helicopter blade is provided, which assists in the disassembly / installation of a tail rotor folding actuator, the disassembly / installation of a tail rotor pin puller actuator, the disassembly / installation of a tail transmission oblique shaft, and the debugging / troubleshooting / functional verification of a tail rotor folding system. The method comprises:

[0019] Remove the corresponding plugs on the helicopter and connect the five solenoid valve plugs of the main valve, tail rotor pull pin, tail rotor upper pin, tail rotor folding, and tail rotor unfolding as required;

[0020] Check the control box described in any one of claims 1-7 as required, turn it on, install the magnetic fuse of the remote control, and test that the emergency stop function is in good condition;

[0021] Helicopter auxiliary hydraulic system pressure supply;

[0022] Install the reference pin at the servo input;

[0023] Confirm again that there is no external interference in the tail rotor folding area to avoid collision;

[0024] Press the master valve button on the remote control once to connect the pressure of the solenoid valve of the tail rotor folding system;

[0025] Press and hold the tail propeller pin removal button on the remote controller until the tail propeller is completely removed, then release the button.

[0026] Press and hold the tail propeller folding button on the remote control, and release the button after the tail propeller folds to the desired position. If any special situation occurs, release the button immediately and press the emergency stop button;

[0027] Press and hold the tail rotor deployment button on the remote control, and release the button when the tail rotor is deployed to the desired position. When the tail rotor is about to reach the upper pin position, confirm that the tail rotor is completely pinned out again, and then operate the tail rotor to deploy to the upper pin position;

[0028] Press and hold the tail rotor pin up button on the remote controller until the tail rotor is fully pinned up.

[0029] Press the master valve button on the remote control once to disconnect the pressure of the tail rotor folding system solenoid valve.

[0030] Furthermore, the method can also assist in the debugging / troubleshooting / functional verification of the main propeller folding system, including:

[0031] Remove the corresponding plugs on the machine and connect the four plugs of the main valve, main propeller folding, main propeller unfolding, and folding accumulator as required;

[0032] Check the control box and start it as required, install the magnetic fuse of the remote controller, and test that the emergency stop function is in good condition;

[0033] Helicopter auxiliary hydraulic system pressure supply;

[0034] Install the reference pin at the steering gear input, cut off the steering gear hydraulic pressure, and install the reference pin on the lower rocker arm of the three main boosters;

[0035] Re-confirm that there is no external interference in the main rotor folding area, especially for helicopters with main rotor blades installed, to avoid collisions;

[0036] Rotate the main propeller until the folding line on the self-tilt indicator is aligned, and pull the rotor brake to lock the main propeller;

[0037] Press the master valve button on the remote control once to switch on the pressure of the solenoid valve of the main propeller folding system;

[0038] Press and hold the main propeller folding button on the remote control, and release the button after the main propeller folds to the desired position. If any special situation occurs, release the button immediately and press the emergency stop button;

[0039] Press and hold the main propeller deployment button on the remote control, and release the button after the main propeller is fully deployed;

[0040] Press the master valve button on the remote control once to disconnect the pressure of the main propeller folding system solenoid valve.

[0041] Beneficial effects:

[0042] This control box is equipped with a separate power supply system. After being connected to the corresponding hydraulic solenoid valves on the aircraft through a wiring harness, the opening and closing of the corresponding solenoid valves of the helicopter hydraulic folding system can be controlled by the remote control. When the helicopter folding hydraulic system is complete and has a pressure supply state, the control box can be used in conjunction with the pressure supply condition to operate the remote control to perform the inclined beam pin pulling and pin raising, inclined beam folding and unfolding, and main rotor folding and unfolding operations separately. It can conveniently and quickly assist in the disassembly / installation of the inclined beam folding actuator, the disassembly / installation of the inclined beam pin pulling actuator, the disassembly / installation of the tail transmission inclined shaft, the debugging / troubleshooting / functional verification of the tail inclined beam folding system, and the debugging / troubleshooting / functional verification of the main rotor folding system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the folding control box panel.

[0044] Figure 2 This is the circuit diagram of the folding control circuit.

[0045] Figure 3 A schematic diagram of the structure of the remote control. DETAILED DESCRIPTION

[0046] The present invention provides a remote control box for folding helicopter blades. Figure 1-3 As shown, including:

[0047] Remote control box body 1, remote control 2, main / tail rotor folding connection harness 3, folding control circuit 4;

[0048] The remote control box body is divided into two layers, the lower layer contains the folding control circuit, and the upper layer is divided into a storage area and a control panel area. The storage area is used to place the remote control and the main / tail propeller folding connection harness, and the control panel area is provided with a main propeller folding adapter socket 5, a tail propeller folding adapter socket 6, an indicator light 7, a switch 8, and a power / voltage indicator panel 9;

[0049] There are 8 buttons on the remote control panel, which are used to control the main valve switch of the folding hydraulic system, emergency stop, main rotor folding, main rotor deployment, tail rotor pin removal, tail rotor pin placement, tail rotor folding and tail rotor deployment;

[0050] The folding control circuit is used to receive the key commands of the remote controller, and control the solenoid valve switch of the folding hydraulic system of the folding helicopter according to the key commands, so as to realize the main valve switch, emergency stop, main rotor folding, main rotor deployment, tail rotor pin removal, tail rotor pin placement, tail rotor folding and tail rotor deployment of the folding hydraulic system of the folding helicopter;

[0051] The main / tail rotor folding connection harness is used to connect to the corresponding hydraulic solenoid valve on a folding helicopter through the main / tail rotor folding adapter socket.

[0052] Further, such as Figure 2 As shown, the folding control circuit 4 includes a battery 41, a power meter 42, an indicator light 43, an eight-way remote control controller 44, a switch 45, a first positive parallel branching module 46, a second positive parallel branching module 47, and a negative parallel branching module 48;

[0053] The positive electrode of the battery is connected to the positive electrode of the electricity meter through the switch and the first positive parallel branching module, and is also connected to the positive terminal of the control power supply and the emergency stop control input of the eight-way remote control controller respectively; the red light input of the indicator light is connected to the normally open output of the emergency stop control of the eight-way remote control controller; the normally closed output of the emergency stop control of the eight-way remote control controller is connected to the main valve switch control input of the folding hydraulic system, the main propeller folding input, the main propeller deployment input, the tail propeller pin pulling input, the tail propeller pin input, the tail propeller folding input, the tail propeller deployment input and the main propeller folding adapter socket through the second positive parallel branching module. The main valve switch controls the normally open output terminal, the main propeller folding normally open output terminal, and the main propeller unfolding normally open output terminal, respectively, and are connected to different input interfaces of the main propeller folding adapter socket; the tail propeller pin pull-out normally open output terminal, the tail propeller upper pin normally open output terminal, the tail propeller folding normally open output terminal, and the tail propeller unfolding normally open output terminal are respectively connected to different input interfaces of the tail propeller folding adapter socket; the negative terminal of the control power supply of the eight-way remote control controller, the negative terminal of the electricity meter, the negative terminal of the indicator light, and all the negative terminal interfaces of the main / tail propeller folding adapter sockets are connected to the negative terminal of the battery through the negative parallel distribution module and the switch.

[0054] Furthermore, the control box connects the main / tail rotor folding connection harness to the control box as required, and the tail rotor folding connection harness is connected to the helicopter tail rotor pull / pin-up hydraulic solenoid valve and the tail rotor folding / deployment hydraulic solenoid valve; the main rotor folding connection harness is connected to the helicopter main rotor main hydraulic solenoid valve, the main rotor folding / deployment hydraulic solenoid valve and the main rotor folding accumulator.

[0055] Furthermore, the control panel area is also provided with a charging interface 10 for charging the battery, and the storage area is also used to accommodate a battery charger 11.

[0056] Furthermore, the fuel gauge is used to identify the remaining power percentage and current voltage of the detection battery and display them through the power / voltage indicator panel.

[0057] Furthermore, the main valve button and the emergency stop button are self-locking controls, that is, they are connected when pressed once and released, and disconnected when pressed again and released. The remaining buttons are inching controls, that is, they are connected when pressed and disconnected when released; the indicator light on the remote control flashes when any button is operated alone.

[0058] Furthermore, when the control box is turned on, the green indicator light is on, the emergency stop button is pressed once, the indicator light should turn red, the emergency stop button is pressed again, the indicator light turns green, and when the indicator light turns red, the functions of the other keys will be invalid.

[0059] The control box contains the following items:

[0060] 1. Remote control box body 1 piece;

[0061] 2. 1 remote control;

[0062] 3. 1 set of main propeller folding connection harness;

[0063] 4. 1 set of tail rotor folding connection harness;

[0064] 5. Charger 1 piece;

[0065] 6. One instruction manual.

[0066] The present invention provides a remote control box for folding helicopter blades, the functions of which include:

[0067] 1. Charging

[0068] Connect the charger connector to the interface on the lower right corner of the control box panel, and connect the charger to the AC220V circuit. The charger indicator light will turn red when charging, and turn green when charging is complete.

[0069] 2. Power on

[0070] Press the power button on the right side of the control box panel, the switch should light up, the green indicator light should light up, press the switch button on the power / voltage indicator to check the current battery power and voltage. When the displayed voltage is less than 23V, charging is required.

[0071] 3. Use of remote control

[0072] Remote control panel Figure 3 As shown, the remote control is powered by 4 No. 5 batteries. There are 8 buttons on the panel, of which the "main valve" and "emergency stop" buttons are self-locking controls, that is, they are connected after pressing once and releasing, and disconnected after pressing again and releasing. The remaining buttons are inching controls, that is, they are connected when pressed and disconnected after releasing. Before using the remote control, the magnetic fuse must be installed in the position shown in the figure. The indicator light flashes when any button is operated alone. When the remote control is not in use temporarily, the magnetic fuse should be removed to avoid misoperation. The magnetic fuse should also be removed after the remote control is used.

[0073] Note: The effective distance of the remote control is 50 meters.

[0074] 4. Emergency stop function test

[0075] Turn on the control box, the green indicator light will be on, press the "Emergency Stop" button on the remote control once, the indicator light will turn red, press the "Emergency Stop" button again, the indicator light will turn green, when the indicator light turns red, the functions of the other keys will be invalid.

[0076] 5. Control box connection

[0077] Place the folding control box on a stable platform on the right side of the helicopter's second engine. Connect the main / tail rotor folding connection harness to the control box as required. Connect the tail rotor folding connection harness to the helicopter's tail rotor pull / up pin hydraulic solenoid valve and the tail rotor fold / expand hydraulic solenoid valve.

[0078] The main rotor harness cable is respectively connected to the helicopter main rotor master hydraulic solenoid valve, the main rotor folding / deployment hydraulic solenoid valve and the main rotor folding accumulator solenoid valve on the right platform folding accessory board of the helicopter 2 engine.

[0079] 1. Tail rotor folding and unfolding operation

[0080] This operation can assist in the disassembly / installation of the inclined beam folding actuator, the disassembly / installation of the inclined beam pin pulling actuator, the disassembly / installation of the tail transmission inclined shaft, and the debugging / troubleshooting / functional verification of the tail inclined beam folding system.

[0081] Steps:

[0082] 1) Remove the corresponding plugs on the aircraft and connect the five plugs of the main valve, tail rotor pull pin, tail rotor upper pin, tail rotor folding, and tail rotor unfolding as required;

[0083] 2) Turn on the control box and check as required, install the magnetic fuse of the remote control, and test that the emergency stop function is in good condition;

[0084] 3) Pressure supply of helicopter auxiliary hydraulic system (ground pressure supply or connecting auxiliary pump, inspection before pressure supply shall be carried out in accordance with relevant requirements);

[0085] 4) Install the reference pin at the servo input;

[0086] 5) Confirm again that there is no external interference in the folding area of ​​the tail beam to avoid collision;

[0087] 6) Press the master valve button on the remote control once to connect the pressure of the solenoid valve of the tail rotor folding system;

[0088] 7) Press and hold the beam unpinning button on the remote control until the beam is completely unpinned, and release the button after the unpinning is completed;

[0089] 8) Press and hold the folding key on the remote control, and release the key after the folding of the beam reaches the desired position. In case of special circumstances, release the key immediately and press the emergency stop key;

[0090] 9) Press and hold the diagonal beam expansion button on the remote control, operate the diagonal beam to expand to the desired position and then release the button. When the diagonal beam is about to reach the upper pin position, you need to confirm again that the diagonal beam is completely pinned, and then operate the diagonal beam to expand to the upper pin position;

[0091] 10) Press and hold the upper pin button on the remote control until the beam is fully pinned up;

[0092] 11) Press the master valve button on the remote control once to disconnect the pressure of the solenoid valve of the tail rotor folding system;

[0093] 2. Main propeller folding and unfolding operation

[0094] This operation can assist in debugging / troubleshooting / functional verification of the main propeller folding system.

[0095] Steps:

[0096] 1) Remove the corresponding plugs on the machine and connect the four plugs of the main valve, main propeller folding, main propeller unfolding, and folding accumulator as required;

[0097] 2) Turn on the control box and check as required, install the magnetic fuse of the remote control, and test that the emergency stop function is in good condition;

[0098] 3) Pressure supply of helicopter auxiliary hydraulic system (ground pressure supply or connecting auxiliary pump, inspection before pressure supply shall be carried out in accordance with relevant requirements);

[0099] 4) Install the reference pin at the steering gear input, cut off the steering gear hydraulic pressure, and install the reference pin on the lower rocker arm of the three main boosters;

[0100] 5) Re-confirm that there is no external interference in the main rotor folding area, especially for helicopters with main rotor blades installed, to avoid collisions;

[0101] 6) Turn the propeller until the folding line on the self-tilt indicator is aligned, and pull the rotor brake to lock the main propeller;

[0102] 7) Press the master valve button on the remote control once to connect the pressure of the solenoid valve of the main propeller folding system;

[0103] 8) Press and hold the main propeller folding button on the remote control, and release the button after the main propeller folds to the required position. In case of special circumstances, release the button immediately and press the emergency stop button;

[0104] 9) Press and hold the main propeller deployment button on the remote control, and release the button after the main propeller is fully deployed;

[0105] 10) Press the master valve button on the remote control once to disconnect the pressure of the main propeller folding system solenoid valve.

Claims

1. A remote control box for folding helicopter blades, characterized in that: include: Remote control box body, remote control, main / tail rotor folding connection harness, folding control circuit; The remote control box is divided into two layers, the lower layer contains the folding control circuit, and the upper layer is divided into a storage area and a control panel area. The storage area is used to place the remote control and the main / tail propeller folding connection harness, and the control panel area is provided with a main propeller folding adapter socket, a tail propeller folding adapter socket, indicator lights, switches, and a power / voltage indicator panel. There are 8 buttons on the remote control panel, which are used to control the main valve switch of the folding hydraulic system, emergency stop, main rotor folding, main rotor deployment, tail rotor pin removal, tail rotor pin placement, tail rotor folding and tail rotor deployment; The folding control circuit is used to receive the key commands of the remote controller, and control the solenoid valve switch of the folding hydraulic system of the folding helicopter according to the key commands, so as to realize the main valve switch, emergency stop, main rotor folding, main rotor deployment, tail rotor pin removal, tail rotor pin placement, tail rotor folding and tail rotor deployment of the folding hydraulic system of the folding helicopter; The main / tail rotor folding connection harness is used to connect to the corresponding hydraulic solenoid valve on a folding helicopter through the main / tail rotor folding adapter socket.

2. The control box according to claim 1, characterized in that: The folding control circuit includes a battery, a fuel gauge, an indicator light, an eight-way remote control controller, a switch, a first positive parallel branching module, a second positive parallel branching module, and a negative parallel branching module; The positive electrode of the battery is connected to the positive electrode of the electricity meter through the switch and the first positive electrode parallel branching module, and is also connected to the positive terminal of the control power supply and the emergency stop control input of the eight-way remote control controller respectively; the red light input of the indicator light is connected to the normally open output of the emergency stop control of the eight-way remote control controller; the normally closed output of the emergency stop control of the eight-way remote control controller is connected to the main valve switch control input of the folding hydraulic system, the main propeller folding input, the main propeller deployment input, the tail propeller pin pull input, the tail propeller pin input, the tail propeller folding input, the tail propeller deployment input and the main propeller folding adapter socket through the second positive electrode parallel branching module, and is also connected to the green light input of the indicator light; The main valve switch control normally open output terminal, the main propeller folding normally open output terminal, and the main propeller deployment normally open output terminal are respectively connected to different input interfaces of the main propeller folding adapter socket; The tail rotor pin pull-out normally-open output terminal, tail rotor pin upper normally-open output terminal, tail rotor folding normally-open output terminal, and tail rotor deployment normally-open output terminal are respectively connected to different input interfaces of the tail rotor folding adapter socket; the negative terminal of the control power supply of the eight-way remote control controller, the negative pole of the power meter, the negative pole of the indicator light, and all negative pole interfaces of the main / tail rotor folding adapter sockets are connected to the negative pole of the battery through the negative pole parallel distribution module and the switch.

3. The control box according to claim 1, characterized in that: The control box connects the main / tail rotor folding connection harness to the control box as required, and the tail rotor folding connection harness is connected to the helicopter tail rotor pull / pin-up hydraulic solenoid valve and the tail rotor folding / deployment hydraulic solenoid valve; the main rotor folding connection harness is connected to the helicopter main rotor main hydraulic solenoid valve, the main rotor folding / deployment hydraulic solenoid valve and the main rotor folding accumulator.

4. The control box according to claim 1, characterized in that: The control panel area is also provided with a charging interface for charging the battery, and the storage area is also used to accommodate the battery charger.

5. The control box according to claim 2, characterized in that: The fuel gauge is used to identify the remaining power percentage and current voltage of the test battery and display them on the power / voltage indicator panel.

6. The control box according to claim 2, characterized in that: The main valve button and emergency stop button are self-locking control, that is, they are connected when pressed once and released, and disconnected when pressed again and released. The remaining buttons are inching control, that is, they are connected when pressed and disconnected when released; the indicator light on the remote control flashes when any button is operated alone.

7. The control box according to claim 2, characterized in that: When the control box is turned on, the green indicator light is on. Press the emergency stop button once and the indicator light will turn red. Press the emergency stop button again and the indicator light will turn green. When the indicator light turns red, the functions of the other keys will be invalid.

8. A remote control method for folding helicopter blades, characterized in that: The method assists in the disassembly / installation of the tail rotor folding actuator, the disassembly / installation of the tail rotor pin puller actuator, the disassembly / installation of the tail transmission oblique shaft, and the debugging / troubleshooting / functional verification of the tail rotor folding system. The method includes: Remove the corresponding plugs on the helicopter and connect the five solenoid valve plugs of the main valve, tail rotor pull pin, tail rotor upper pin, tail rotor folding, and tail rotor unfolding as required; Check the control box described in any one of claims 1-7 as required, turn it on, install the magnetic fuse of the remote control, and test that the emergency stop function is in good condition; Helicopter auxiliary hydraulic system pressure supply; Install the reference pin at the servo input; Confirm again that there is no external interference in the tail rotor folding area to avoid collision; Press the master valve button on the remote control once to connect the pressure of the solenoid valve of the tail rotor folding system; Press and hold the tail propeller pin removal button on the remote controller until the tail propeller is completely removed, then release the button. Press and hold the tail propeller folding button on the remote control, and release the button after the tail propeller folds to the desired position. If any special situation occurs, release the button immediately and press the emergency stop button; Press and hold the tail rotor deployment button on the remote control, and release the button when the tail rotor is deployed to the desired position. When the tail rotor is about to reach the upper pin position, confirm that the tail rotor is completely pinned out again, and then operate the tail rotor to deploy to the upper pin position; Press and hold the tail rotor pin up button on the remote controller until the tail rotor is fully pinned up. Press the master valve button on the remote control once to disconnect the pressure of the tail rotor folding system solenoid valve.

9. The method according to claim 8, characterized in that This method can also assist in the debugging / troubleshooting / functional verification of the main propeller folding system, including: Remove the corresponding plugs on the machine and connect the four plugs of the main valve, main propeller folding, main propeller unfolding, and folding accumulator as required; Check the control box and start it as required, install the magnetic fuse of the remote controller, and test that the emergency stop function is in good condition; Helicopter auxiliary hydraulic system pressure supply; Install the reference pin at the steering gear input, cut off the steering gear hydraulic pressure, and install the reference pin on the lower rocker arm support of the three main boosters; Re-confirm that there is no external interference in the main rotor folding area, especially for helicopters with main rotor blades installed, to avoid collisions; Rotate the main propeller until the folding line on the self-tilt indicator is aligned, and pull the rotor brake to lock the main propeller; Press the master valve button on the remote control once to switch on the pressure of the solenoid valve of the main propeller folding system; Press and hold the main propeller folding button on the remote control, and release the button after the main propeller folds to the desired position. If any special situation occurs, release the button immediately and press the emergency stop button; Press and hold the main propeller deployment button on the remote control, and release the button after the main propeller is fully deployed; Press the master valve button on the remote control once to disconnect the pressure of the main propeller folding system solenoid valve.

Images