Device and method for checking inflation pressure of undercarriage buffer strut

Abstract

The invention belongs to the field of undercarriage buffer strut inflation pressure inspection, and relates to a device and method for meeting undercarriage buffer strut inflation pressure inspection. The device comprises a bottom supporting structure, a first base, a gear assembly, a first screw rod, a second base, a pressurizing assembly with a gear, a second screw rod, a first fixing part, a polished rod and a wheel shaft fixing part, wherein the first screw rod is arranged on the bottom supporting structure; threads of the first screw rod are meshed with an outer ring of the gear assembly; the first base is installed in the middle of the bottom supporting structure. The gear assembly is connected with the bottom supporting structure through the first base. The gear component is connected with the lower part of the base; the pressurizing assembly with the gear is fixed on the base; the worm assembly is fixed to the base, meshed with an outer gear of the pressurizing assembly with the gear and used for driving the pressurizing assembly to move longitudinally. The fixing piece moves on the polished rod and transmits the longitudinal load of the pressurizing assembly, so that the undercarriage is compressed and stretched, and the polished rod is fixed to the base.

Description

Technical Field

[0001] The present invention belongs to the field of landing gear buffer strut inflation pressure inspection, and in particular relates to a device and method for meeting landing gear buffer strut inflation pressure inspection requirements. Background Art

[0002] When checking the landing gear buffer strut pressure, the first state is: you need to use a jack to lift the helicopter so that the landing gear buffer strut is inflated for the first time in a freely extended state, and after the inflation is completed, perform a pressure check to ensure that it meets the standard; the second state is: the helicopter lands so that the landing gear buffer device is in a compressed state, hang an extension limiter on the buffer device, and then use a jack to lift the helicopter. When the buffer device is in a limited state, perform a buffer strut inflation pressure check. If the air pressure does not meet the standard, repeat the first and second states alternately until the pressure check is qualified. This process requires constantly lifting and lowering the helicopter. Summary of the Invention

[0003] Purpose of the invention: To provide a device and method for checking the inflation pressure of the landing gear buffer strut, which can accurately check the condition of the landing gear buffer strut during inflation, and solve the problems faced by the existing buffer strut inflation, such as insufficient overall weight, insufficient piston rod length, and inability to hang an elongation limiter.

[0004] The technical solution of the present invention: A device for checking the inflation pressure of a landing gear buffer strut comprises: a bottom support structure 1, a first base 2, a gear assembly 3, a first screw 4, a second base 5, a pressurizing assembly with a gear 6, a second screw 7, a first fixing member 8, a polished rod 9, and an axle fixing member 10, wherein: The first screw 4 is arranged on the bottom support structure 1; the thread of the first screw 4 is engaged with the outer ring of the gear assembly 3; the first base 2 is installed in the middle of the bottom support structure 1; the gear assembly 3 is connected to the bottom support structure 1 through the first base 2; the gear assembly 3 is connected to the lower part of the base 5, and is used to drive the base 5 to rotate; the pressure assembly 6 with a gear is fixed on the base 5 to provide a longitudinal load; the worm assembly 7 is fixed on the base 5 and is engaged with the outer gear of the pressure assembly 6 with a gear to drive the longitudinal movement of the pressure assembly 6; the fixing part 8 moves on the light rod 9 to transmit the longitudinal load of the pressure assembly, so that the landing gear is compressed and extended, and the light rod 9 is fixed on the base 5.

[0005] Furthermore, the first base 2 is a plane needle roller bearing base.

[0006] Furthermore, the polished rod 9 is fixed by a fixing member 11 and a joint 12 .

[0007] Furthermore, the axle fixing member 10 is mounted on the polished rod 9 by screws and is fixed to the axle during use to transmit the lateral load.

[0008] Furthermore, the polished rod 9 is fixed on the base 5 and is provided with an axle fixing member 10 for fixing the buffer device.

[0009] Furthermore, the bottom support structure 1 is used to provide a platform and is equipped with 4 movable wheels to facilitate the movement of the tooling and to support and fix the entire tooling.

[0010] Furthermore, after the landing gear extension is adjusted, the fixing member 8 is tightened with a nut to ensure that the extension does not change when the landing gear is inflated.

[0011] A method for checking the inflation pressure of a landing gear buffer strut is provided, wherein the method is performed by means of the device for checking the inflation pressure of a landing gear buffer strut, and the method comprises: Step 1: Inflate the buffer pillar in the first state, i.e., the free state; By cooperating with the first screw 4 and the gear assembly 3 to adjust the tooling angle, the tooling is placed under the buffer pillar, and then the second screw 7 is rotated to make the wheel axle fixing part 10 contact with the bottom of the buffer pillar, and then confirm that the wheel axle of the buffer pillar is positioned on the wheel axle fixing part of the tooling; then slowly rotate the second screw 7 to drive the geared pressure assembly 6 to slowly rise and lift the first fixing part 8 along the direction of the light rod 9 to lift the buffer pillar upward and compress the piston rod of the buffer pillar, so that the piston rod length is compressed to the length of the hanging extension limiter; at this time, the extension limiter is hung on the fixed points on both sides of the buffer pillar, and then slowly rotate the second screw 7 in the opposite direction to make the first fixing part 8 descend and extend the piston rod so that the extension limiter is hung more securely; then rotate the second screw 7 to separate the first fixing part 8 from the buffer pillar. At this time, the piston rod length of the buffer pillar has reached the second state required to measure the air pressure, and then operate the second screw 7 to lower the height and evacuate the tooling, and then perform the pressure measurement of the second state.

[0012] Furthermore, step 1 is specifically as follows: after the high-pressure chamber of the actuator is filled with 9.8 MPa and the low-pressure chamber is filled with 1.5 MPa and the air pressure is qualified, the piston rod is extended to a length of 298-301 mm, and the first state is completed.

[0013] The beneficial effects of this application are: The present invention discloses a device and method for checking the inflation pressure of a landing gear buffer strut, which has the following advantages: 1. The cushioning pillar inflation pressure is checked by tooling, which is easy to operate; 2. The tooling can be flexibly adjusted in height to avoid insufficient gravity on the helicopter and the inability to hang the extension limiter; 3. Automatic positioning is good, and automatic positioning can be achieved after the parts are clamped; 4. Good operability, the installation and removal of tooling is very easy; 5. It saves the number of times of lifting the helicopter and the workload of 5-7 people by removing the large work ladder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the bottom support structure; Figure 2 This is a schematic diagram of the structure of the plane needle roller bearing base; Figure 3 Schematic diagram of the gear assembly structure; Figure 4 Schematic diagram of the first screw structure; Figure 5 Schematic diagram of the base structure; Figure 6 It is a schematic diagram of the structure of the pressurizing component with gears; Figure 7 Schematic diagram of the second screw structure; Figure 8 is a schematic structural diagram of a first fixing member; Figure 9 Schematic diagram of the wheel axle fixing structure; Figure 10 is a schematic structural diagram of a second fixing member; Figure 11 Schematic diagram of the joint structure; Figure 12 Overall assembly drawing of the device for meeting the landing gear cushion strut inflation pressure inspection; Figure 13 A longitudinal sectional view of the overall assembly of the device for checking the inflation pressure of the landing gear cushion strut; Among them, the bottom support structure 1, the first base 2, the gear assembly 3, the first screw 4, the second base 5, the pressure assembly with gear 6, the second screw 7, the first fixing part 8, the polished rod 9, the axle fixing part 10, the second fixing part 11, and two joints 12. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the implementation of this application will be described in more detail below in conjunction with the drawings in the implementation of this application. In the drawings, the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and should not be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in conjunction with the drawings.

[0016] In the description of the present invention, it should be understood that the terms "center", "axial", "vertical", "up", "down", "upper end", "bottom end", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0017] The present invention aims at the conversion between two different states during the landing gear buffer strut inflation pressure inspection process, solves the inconvenience of repeatedly using a jack to lift a helicopter and a large work ladder to remove and place it, and solves the inconvenience of not being able to meet the pressure requirements given by the design in one go. A device for inspecting the landing gear buffer strut inflation pressure and a method for ensuring qualified inflation in one go are specially designed.

[0018] like Figure 1-13 A landing gear cushion strut inflation pressure device is used to measure the inflation pressure of the cushion device, comprising: The bottom support structure 1 is used to provide a platform to initially fix the entire tooling and parts, and to provide a platform for the side loading structure composed of the first screw 4 and the gear assembly 3; The side loading structure is used to install a buffer support and allows the inflatable to perform vertical falling movement; and a second base 5 is set on the buffer device stand and is used to selectively inflate the inflatable.

[0019] The second base 5 is used to initially fix the buffer device, and the longitudinal structure (composed of the second screw 7 and the pressure assembly 6 with gears) has a mutually perpendicular first direction and a second direction that are simultaneously completed. The details are as follows: The bottom support structure 1 is used to provide a platform and is equipped with 4 moving wheels to facilitate the movement of the tooling and to support and fix the entire tooling. The plane needle roller bearing structure 2 is fixed on the bottom support structure 1 to transmit longitudinal load and provide freedom for the gear assembly 2 to rotate relative to the bottom support structure 1; The gear assembly 3 is mounted on the plane needle roller bearing structure 2 and inserted into the middle hole of the bearing to connect the hole and shaft, ensuring that the gear assembly can rotate relative to the bearing structure; The gear assembly 3 is fixed to the lower part of the base 5 and is used to drive the base 5 to rotate; The worm assembly 4 is fixed to the support structure 1 and is used to drive the gear assembly 3 to rotate; The base 5 is used to provide a stand to facilitate the erection of tooling; The geared pressurizing assembly 6 is fixed to the base 5 and is used to provide a longitudinal load; The worm assembly 7 is fixed on the base 5 and is used to drive the pressurizing assembly 6; The fixing member 8 moves on the polished rod 9 to transmit the longitudinal load of the pressurized assembly, causing the landing gear to compress and extend. The fixing member 8 is tightened with a nut after the landing gear extension is adjusted to ensure that the extension does not change when the landing gear is inflated.

[0020] The polished rod 9 is fixed on the base 5 and is provided with an axle fixing member 10 for fixing the buffer device; The wheel axle fixing member 10 is mounted on the polished rod 9 by screws and is fixed to the wheel axle during use to transmit the lateral load.

[0021] The fixing member 11 and the joint 12 are used to fix the polished rod 9 .

[0022] Working principle: The buffer strut is inflated in the first state (free state). The actuator is filled with 9.8 MPa in the high-pressure chamber and 1.5 MPa in the low-pressure chamber. After the air pressure is qualified, the piston rod extends to a length of 298-301 mm, and the first state is completed.

[0023] The tooling angle is adjusted through the side loading structure (composed of the first screw 4 and the gear assembly 3) to place the tooling under the buffer pillar, and then the second screw 7 is rotated to make the wheel axle fixing part 10 contact with the bottom of the buffer pillar, and then confirm that the wheel axle of the buffer pillar is positioned on the wheel axle fixing part of the tooling, and then the second screw 7 is slowly rotated to drive the geared pressure assembly 6 to slowly rise and lift the first fixing part 8 along the direction of the light rod 9 to lift the buffer pillar upward and compress the piston rod of the buffer pillar, so that the piston rod length is compressed to less than 150mm, which can be used to hang the elongation limiter. At this time, the elongation limiter is hung on the fixed points on both sides of the buffer pillar, and then the second screw 7 is slowly rotated in the opposite direction to make the first fixing part 8 descend and extend the piston rod so that the elongation limiter is hung more securely, and then the second screw 7 is rotated to separate the first fixing part 8 from the buffer pillar. At this time, the piston rod length of the buffer pillar has reached the second state required to measure the air pressure, and then the second screw 7 is operated to lower the height and evacuate the tooling, and then the pressure measurement of the second state is performed.

[0024] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A device for checking the inflation pressure of a landing gear cushion strut, characterized in that: include: A bottom support structure (1), a first base (2), a gear assembly (3), a first screw (4), a second base (5), a pressure assembly with a gear (6), a second screw (7), a first fixing member (8), a polished rod (9), and an axle fixing member (10), wherein: The first screw rod (4) is arranged on the bottom support structure (1); the thread of the first screw rod (4) is meshed with the outer ring of the gear assembly (3); the first base (2) is installed in the middle of the bottom support structure (1); the gear assembly (3) is connected to the bottom support structure (1) through the first base (2); the gear assembly (3) is connected to the lower part of the base (5) and is used to drive the base (5) to rotate; the pressure assembly (6) with a gear is fixed on the base (5) and is used to provide a longitudinal load; the worm assembly (7) is fixed on the base (5) and is meshed with the outer gear of the pressure assembly (6) with a gear to drive the longitudinal movement of the pressure assembly (6); the fixing member (8) moves on the light rod (9) to transmit the longitudinal load of the pressure assembly, so as to compress and extend the landing gear, and the light rod (9) is fixed on the base (5).

2. The device according to claim 1, characterized in that The first base (2) is a plane needle roller bearing base.

3. The device according to claim 2, characterized in that The polished rod (9) is fixed by a fixing member (11) and a joint (12).

4. The device according to claim 3, characterized in that The wheel axle fixing member (10) is mounted on the polished rod (9) by screws and is fixed to the wheel axle during use to transmit the lateral load.

5. The device according to claim 4, characterized in that The polished rod (9) is fixed on the base (5) and is provided with an axle fixing member (10) for fixing the buffer device.

6. The device according to claim 5, characterized in that The bottom support structure (1) is used to provide a platform and is provided with four movable wheels to facilitate the movement of the tooling and to support and fix the entire tooling.

7. The device according to claim 1, characterized in that The fixing member (8) is tightened with a nut after the landing gear extension is adjusted, ensuring that the extension does not change when the landing gear is inflated.

8. A method for checking the inflation pressure of a landing gear cushion strut, characterized in that: The method is performed by means of a device for checking the inflation pressure of a landing gear cushion strut according to any one of claims 1 to 7, and the method comprises: Step 1: Inflate the buffer pillar in the first state, i.e., the free state; The tooling is adjusted by cooperating with the first screw (4) and the gear assembly (3) to place the tooling below the buffer pillar, and then the second screw (7) is rotated to make the wheel axle fixing member (10) contact the bottom of the buffer pillar and then confirm that the wheel axle of the buffer pillar is positioned on the wheel axle fixing member of the tooling; then the second screw (7) is slowly rotated to drive the pressure assembly (6) with the gear to slowly rise and lift the first fixing member (8) and lift the buffer pillar upward along the direction of the light rod (9) to compress the piston rod of the buffer pillar so that the piston rod length is compressed to the length of the hanging extension limiter; at this time, the extension limiter is hung on the fixed points on both sides of the buffer pillar, and then the second screw (7) is slowly rotated in the opposite direction to make the first fixing member (8) descend and extend the piston rod so that the extension limiter is hung more firmly; then the second screw (7) is rotated to separate the first fixing member (8) from the buffer pillar. At this time, the piston rod length of the buffer pillar has reached the second state required to measure the air pressure, and then the second screw (7) is operated to lower the height and evacuate the tooling, and then the pressure measurement of the second state is performed.

9. The method according to claim 8, characterized in that Step 1 is specifically as follows: after the actuator is filled with 9.8 MPa in the high-pressure chamber and 1.5 MPa in the low-pressure chamber and the air pressure is qualified, the piston rod is extended to a length of 298-301 mm, and the first state is completed.

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