RAT cabin door loading device and use method

Abstract

The RAT cabin door loading device comprises a winch, the winch is connected with a cabin door through two transmission pull rods, a force sensor is connected between the two transmission pull rods, balancing weights are arranged on the two sides of the winch, cables connected with the balancing weights pass through a plurality of fixed pulleys and then are connected to the winch, the balancing weights are arranged on an electric cylinder, and the electric cylinder is connected with the winch. The electric cylinder can lift the balancing weight, and the force sensor is also connected between the cable and the balancing weight. According to the method, the load is applied to the proper position of the outer skin of the cabin door, the connecting point is selected on the skin of the cabin door, and constant-torque load output can be achieved in the opening process of the cabin door.

Description

Technical Field

[0001] The present invention belongs to the technical field of aircraft load loading, and in particular relates to a RAT door loading device and a use method thereof. Background Art

[0002] The RAT door is used on the aircraft to open and lower the RAT device in emergency situations. During the ground simulation test, it is necessary to simulate the total aerodynamic load stress that the door is subjected to during the no-load opening process to verify whether the functional performance of the door retraction and extension system meets the design requirements.

[0003] There are currently two commonly used door loading technologies: one is to glue a canvas bag to the door body, put a pin rod on the canvas bag, and then apply the load to the door body by pulling the pin rod. This loading method is mainly suitable for static loading, and the loading force cannot change its angle and direction in real time as the door position changes.

[0004] The other method is to pull (or push) the door body through the actuator. This loading method can achieve dynamic loading according to the position of the door. However, due to the large size of the servo actuator, the installation space of the loading system is large and it cannot meet the installation requirements of the loading device in a smaller space.

[0005] Regarding the RAT door loading device, the door will open instantly when the RAT is lowered. If a more advanced servo loading system is used to apply resistance loading, the response time of the servo control mechanism is generally 0.2s when the door opens. It still cannot truly reflect the aerodynamic load when the RAT door opens quickly, and problems such as local stress concentration will occur in a short period of time. Summary of the invention

[0006] Purpose of the Invention

[0007] In view of the above problems of the existing door loading method, the present invention provides a RAT door loading device and a use method.

[0008] Inventing technical solutions

[0009] A RAT hatch door loading device is characterized in that it includes a winch, the winch is connected to the hatch through two transmission rods, a force sensor is connected between the two transmission rods, counterweights are arranged on both sides of the winch, the cable connected to the counterweights is connected to the winch after passing through a plurality of fixed pulleys, the counterweights are arranged on an electric cylinder, the electric cylinder can lift the counterweights, and a force sensor is also connected between the cable and the counterweights.

[0010] Preferably, the capstan is connected to a rotating shaft, the rotating shaft is rotatably arranged in an inner hole of a bearing seat, and the bearing seat is fixed on a supporting frame.

[0011] Preferably, the rotation axis is coaxial with the door rotation hinge axis.

[0012] Preferably, the force sensor connected between the cable and the counterweight is a pin-type force sensor.

[0013] Preferably, a bearing is arranged between the rotating shaft and the inner hole of the bearing seat.

[0014] Preferably, the fixed pulley is connected to the bottom surface of the supporting frame.

[0015] Preferably, the transmission rod is threadedly connected to the force sensor.

[0016] Preferably, the rotation axis is positioned by a laser locator.

[0017] A method for using a RAT door loading device comprises the following steps: before a loading test is started, a host computer is started, and the weight of a counterweight is adjusted to ensure that a collected value of a force sensor between two transmission pull rods is close to a target resistance value; the loading direction is first determined, and an electric cylinder on one side of the loading is lowered, and a counterweight on the other side is lifted by the electric cylinder, ensuring that a cable on one side of the loading is in a tensioned state and a cable on the other side is in a relaxed state, so as to ensure a force balance state of a winch; and a value of a force sensor connected to the counterweight on the loading side is read, and the loading test can be carried out when the difference between the value of the force sensor on the loading side and the value of the force sensor between the two transmission pull rods is within 10N.

[0018] Preferably, before starting the host computer, first determine whether the cable is firmly connected to the winch and the counterweight.

[0019] Advantages of the present invention: The present invention applies a load at a suitable position on the outer skin of the hatch, and the connection point is selected on the skin of the hatch. During the hatch opening process, a constant torque load output can be achieved. The control system realizes closed-loop signal feedback, collects the input signal and output signal of the loading force, and the hatch opening angle signal in real time, can truly monitor the movement state of the hatch, and ensure the validity of the test data. The composition structure of this set of loading devices is simplified, the structure is compact, and the space occupancy is small, which greatly reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the RAT hatch loading device.

[0021] Figure 2 A 3D schematic diagram of the RAT door loading winch assembly.

[0022] Figure 3 It is a three-dimensional schematic diagram of the connection between the capstan and the bearing seat.

[0023] Figure 4 It is a three-dimensional schematic diagram of the lifting cylinder assembly.

[0024] In the figure: 1-support frame, 2-winch, 3-lifting electric cylinder assembly, 2-1-transmission rod 2-2-winch, 2-3-cable, 2-4-fixed pulley, 2-5-transmission shaft, 3-1-pin shaft sensor, 3-2-bearing seat, 4-1-counterweight, 4-2-electric cylinder. DETAILED DESCRIPTION

[0025] The present invention is achieved through the following technical solutions.

[0026] A RAT door loading device includes a supporting frame 1, a winch assembly 2, and a lifting electric cylinder assembly. The winch assembly 2 mainly includes a transmission pull rod 2-1, a winch 2-2, a cable 2-3, a fixed pulley block 2-4, a bearing seat 3-2, a rotating shaft 3-1, etc. The lifting electric cylinder assembly includes an electric cylinder 4-2, a counterweight block 4-1, and a pin shaft sensor.

[0027] The support frame 1 is mainly used to provide a mounting platform for the winch assembly 2 and the lifting cylinder assembly. Figure 1 The support frame 1 can be mounted on an aircraft iron bird test bench.

[0028] The bearing seat 3-2 is fixed on the supporting frame 1, the winch 2-2 is fixed on the rotating shaft 3-1, the rotating shaft 3-1 is rotatably arranged in the inner hole of the bearing seat 3-2, a bearing is arranged between the bearing seat 3-2 and the rotating shaft 3-1, and the axis of the bearing seat 3-2 is in the same straight line as the axis of rotation of the cabin door, which can ensure the consistency of the rotation of the winch 2-2 and the rotation of the cabin door.

[0029] The winch 2-2 is connected to the hatch through the transmission rod 2-1 and the hatch connection tooling. A force sensor is installed between the two transmission rods 2-1. Before the test starts, it can be monitored whether the force sensor differs from the pin-type force sensor at the counterweight block by no more than 10N, ensuring the accuracy of the initial value of the hatch load.

[0030] The fixed pulley block 2-4 is installed under the supporting frame 1, and can change the direction of the force to dock with the counterweight block 4-1. During the opening process of the hatch, the cable at the counterweight block 4-1 on one side is in a tensioned state.

[0031] When installing the winch assembly 2, first use a laser locator to select no less than 3 coordinate system base points for position positioning, which is used to fit the coordinates of the door rotating hinge axis with the coordinates of the measured axis, see Figure 2 The rotating shaft 3-1 and the bearing seat 3-2 are pre-assembled into a whole, see Figure 3 Then, the rotating shaft 3-1 and the door rotating hinge shaft are coaxially installed through a laser positioning device to ensure that the coaxiality is within 0.01mm, so as to ensure that the winch rotation and the door rotation are always in a synchronous state. After the rotating shaft 3-1 is installed, the mounting hole on the winch 2 is assembled with the rotating shaft 3-1 and then locked.

[0032] After the transmission rod 2-1 and the outer ring hole of the winch 2-2 are pre-assembled, they are assembled with the hatch connection tooling. The hatch connection tooling and the hatch connection are glued tightly with casting glue, and the fixing fixture is removed after standing for more than 48 hours to ensure the firmness of the hatch skin and the tooling. The two transmission connecting rods 2-1 are respectively threadedly connected to the force sensor, which can be used to ensure that the direction of resistance of the hatch during movement is always normal to the force point of the hatch.

[0033] One end of the cable 2-3 passes through the inner hole of the winch slot, and the other end is connected to the counterweight 4-1 through the fixed pulley group 2-4. The counterweight 4-1 is lifted by the lifting cylinder 4-2. The counterweight and the pin-type force sensor are installed above the cylinder 4-2. Figure 4 .

[0034] The method of using the above-mentioned loading device takes the RAT hatch opening simulation and application of pneumatic load as an example. Before starting the loading test, first determine whether the cable 2-3 is firmly connected to the winch 2-2 and the counterweight 4-1, start the host computer, adjust the weight of the counterweight 4-1 to determine that the collected value of the force sensor at the connecting rod is close to the target resistance value. First determine the loading direction. When the direction of the hatch opening is blocked, the left electric cylinder should be lowered, and the right counterweight 4-1 should be raised by the lifting electric cylinder to ensure that the left cable is in a tensioned state and the other end of the cable is in a relaxed state to ensure the force balance of the winch. Read the value of the loading force sensor at the left counterweight 4-1. If the difference with the value of the force sensor fed back at the connecting rod is within 10N, the loading test can be carried out.

[0035] The protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these changes and modifications.

Claims

1. A RAT door loading device, characterized in that: The invention comprises a winch (2-2), wherein the winch (2-2) is connected to a cabin door via two transmission pull rods (2-1), a force sensor is connected between the two transmission pull rods (2-1), counterweights (4-1) are arranged on both sides of the winch (2-2), a cable (2-4) connected to the counterweights (4-1) is connected to the winch (2-2) via a plurality of fixed pulleys (2-4), the counterweights (4-1) are arranged on an electric cylinder (4-2), the electric cylinder (4-2) can lift the counterweights (4-1), and a force sensor is also connected between the cable (2-4) and the counterweights (4-1).

2. A RAT door loading device as claimed in claim 1, characterized in that: The capstan (2-2) is connected to a rotating shaft (3-1), the rotating shaft (3-1) is rotatably arranged in the inner hole of a bearing seat (3-2), and the bearing seat (3-2) is fixed on the supporting frame (1).

3. A RAT door loading device as claimed in claim 1, characterized in that: The rotating shaft (3-1) is coaxial with the rotating hinge shaft of the cabin door.

4. A RAT door loading device as claimed in claim 1, characterized in that: The force sensor connected between the cable (2-4) and the counterweight (4-1) is a pin-type force sensor.

5. A RAT door loading device as claimed in claim 2, characterized in that: A bearing is arranged between the rotating shaft (3-1) and the inner hole of the bearing seat (3-2).

6. A RAT door loading device as claimed in claim 2, characterized in that: The fixed pulley (2-4) is connected to the bottom surface of the supporting frame (1).

7. A RAT door loading device as claimed in claim 1, characterized in that: The transmission pull rod (2-1) is threadedly connected to the force sensor.

8. A RAT door loading device as claimed in claim 3, characterized in that: The rotating shaft (3-1) is positioned by a laser positioning device.

9. A method for using a RAT door loading device according to any one of claims 1 to 8, characterized in that: Before the loading test begins, the host computer is started, and the weight of the counterweight (4-1) is adjusted to ensure that the collected value of the force sensor between the two transmission pull rods (2-1) is close to the target resistance value; first determine the loading direction, lower the electric cylinder on the loading side, and lift the counterweight (4-1) on the other side through the electric cylinder to ensure that the cable (2-3) on the loading side is in a tensioned state and the cable on the other side is in a relaxed state to ensure the force balance of the winch (2-2); read the value of the force sensor connected to the counterweight (4-1) on the loading side, and the difference with the value of the force sensor between the two transmission pull rods (2-1) is within 10N, then the loading test can be carried out.

10. The method for using the RAT door loading device according to claim 9, characterized in that: Before starting the upper computer, first determine whether the cable (2-3) is firmly connected to the winch (2-2) and the counterweight (4-1).

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