Undercarriage angle measuring device

Abstract

The utility model is applicable to the technical field of undercarriages, and provides an undercarriage angle measuring device, which comprises a laser displacement sensor and an angle sensor, the angle sensor is used for measuring the rotation angle of a rocker arm around a hollow rotating shaft, the angle measured by the angle sensor is alpha, and the rotation angle of an undercarriage piston rod is alpha / 2. According to the utility model, the laser displacement sensor and the angle sensor are integrated, so that the problem of undercarriage measurement in a complex shape and in a dynamic process is ingeniously solved. The device can accurately measure the rotation angle and the compression amount of the undercarriage piston rod at the same time, does not need complex installation, and is high in adaptability. The high-precision measurement of the laser displacement sensor ensures the accuracy of the expansion amount, and the angle sensor realizes the accurate measurement of the rotation angle through non-contact induction and isosceles triangle geometrical relationship calculation. The whole device is compact in structure and easy to install and maintain, and provides a reliable and accurate measurement means for the dynamic performance test of the undercarriage.

Description

Technical Field

[0001] The utility model belongs to the technical field of landing gears, and particularly relates to a landing gear angle measuring device. Background Technique

[0002] A certain type of landing gear on the market has a complex shape and is in a dynamic process during measurement, so it is impossible to directly install an angle sensor by conventional methods. In addition, during the test, the piston rod of the landing gear not only undergoes a compression movement but also rotates simultaneously. According to the test requirements, it is difficult to accurately measure the rotation angle and compression amount of such a piston rod at the same time. For this reason, a landing gear angle measuring device is proposed. Content of the Utility Model

[0003] The purpose of the utility model is to provide a landing gear angle measuring device, aiming to solve the problems proposed in the above background technique.

[0004] The embodiment of the utility model is implemented as follows. A landing gear angle measuring device includes:

[0005] A telescopic amount measuring part, including a laser displacement sensor bracket, a laser displacement sensor, a screw one, a clamp, a screw three, and a screw four;

[0006] An angle measuring part, including a nut, an induction block fixing seat, a bearing, a rocker arm, a screw two, an angle sensor, a cushion block, an angle sensor base, a screw five, a hoop, a screw six, and a cylindrical pin;

[0007] The laser displacement sensor bracket is composed of a laser displacement sensor mounting seat and a guide groove; the laser displacement sensor is fixed on the outer cylinder of the landing gear through the laser displacement sensor bracket;

[0008] The angle sensor base is fixed on the piston rod of the landing gear through a screw five, a hoop, a screw six, and a cylindrical pin; an installation hole is opened in the angle sensor base;

[0009] The rocker arm is composed of a hollow rotating shaft, a dial rod, and a rocker arm body; the hollow rotating shaft is fixed in the installation hole of the angle sensor base through a bearing; the dial rod is stuck in the guide groove of the laser displacement sensor bracket and is slidably connected thereto;

[0010] The angle sensor is used to measure the rotation angle of the rocker arm around the hollow rotating shaft and is composed of an induction block and a sensor body; the induction block is fixed on the induction block fixing seat through a screw, and the rotating shaft on the induction block fixing seat passes through the hollow hole of the hollow rotating shaft and is fixed through a nut; the sensor body is fixed on the lower surface of the angle sensor base through a cushion block and a screw two;

[0011] The angle measured by the angle sensor is α, and the rotation angle of the piston rod of the landing gear is α / 2.

[0012] Further, the laser displacement sensor is fixed on the laser displacement sensor bracket by the first screw, and the laser displacement sensor bracket is fixed on the outer cylinder of the landing gear by the clamp, the third screw and the fourth screw.

[0013] Further, the laser reflection surface of the laser displacement sensor is the fan-shaped plane on the angle sensor base.

[0014] Further, the angle sensor is a non-contact inductive angle sensor.

[0015] Further, the distance between the sensor body and the induction block is 2-4 mm.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] By integrating the laser displacement sensor and the angle sensor, the landing gear angle measuring device cleverly solves the measurement problem of the landing gear with complex shape and dynamic process. It can accurately measure the rotation angle and compression amount of the landing gear piston rod at the same time, without complex installation and with strong adaptability. The high-precision measurement of the laser displacement sensor ensures the accuracy of the telescopic amount, and the angle sensor realizes the accurate measurement of the rotation angle through non-contact induction and the calculation of the isosceles triangle geometric relationship. The whole device has a compact structure, is easy to install and maintain, and provides a reliable and accurate measurement means for the dynamic performance test of the landing gear. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the landing gear angle measuring device.

[0019] Figure 2 It is Figure 1 the top view of

[0020] Figure 3 It is Figure 1 the bottom view of the angle sensor base in

[0021] Figure 4 It is Figure 1 the side view of

[0022] Figure 5 It is the schematic diagram of the angle measurement principle.

[0023] In the figure: 1-laser displacement sensor bracket, 2-laser displacement sensor, 3-first screw, 4-nut, 5-induction block fixing seat, 6-bearing, 7-rocker arm, 8-second screw, 9-angle sensor, 10-pad, 11-clamp, 12-third screw, 13-fourth screw, 14-angle sensor base, 15-fifth screw, 16-band clamp, 17-sixth screw, 18-cylindrical pin. Detailed implementation mode

[0024] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] The following describes the specific implementation of the present utility model in detail with reference to specific embodiments.

[0026] As Figures 1-4 shown, a landing gear angle measuring device provided by an embodiment of the present utility model includes:

[0027] The telescopic amount measuring part includes a laser displacement sensor bracket 1, a laser displacement sensor 2, a first screw 3, a clamp 11, a third screw 12 and a fourth screw 13.

[0028] The angle measuring part includes a nut 4, an induction block fixing seat 5, a bearing 6, a rocker arm 7, a second screw 8, an angle sensor 9, a cushion block 10, an angle sensor base 14, a fifth screw 15, a hoop 16, a sixth screw 17 and a cylindrical pin 18.

[0029] The laser displacement sensor bracket 1 is composed of a laser displacement sensor mounting seat and a guide groove; the laser displacement sensor 2 is fixed on the landing gear outer cylinder through the laser displacement sensor bracket 1; the laser reflection surface of the laser displacement sensor 2 is a fan-shaped plane on the angle sensor base 14.

[0030] The angle sensor base 14 is fixed on the landing gear piston rod through a fifth screw 15, a hoop 16, a sixth screw 17 and a cylindrical pin 18; an installation hole is provided in the angle sensor base 14. Since the angle sensor base 14 is fixed on the landing gear piston rod, the displacement of the laser reflection surface is the contraction displacement of the landing gear piston rod, and thus the telescopic amount of the landing gear piston rod can be directly measured.

[0031] The rocker arm 7 is composed of a hollow rotating shaft, a lever and a rocker arm body. The hollow rotating shaft is fixed in the installation hole of the angle sensor base 14 through a bearing 6, so that the rocker arm 7 can swing flexibly around the hollow rotating shaft. The lever is stuck in the guide groove of the laser displacement sensor bracket 1, and the lever can slide flexibly in the guide groove when the landing gear piston rod rotates.

[0032] The angle sensor 9 is a non-contact inductive angle sensor, which consists of an induction block and a sensor body. The induction block is fixed on the induction block fixing seat 5 by screws. The rotating shaft on the induction block fixing seat 5 passes through the hollow hole of the hollow rotating shaft and is fixed by a nut 4, so that the rotating shaft on the induction block fixing seat 5 can rotate synchronously with the hollow rotating shaft. The sensor body is fixed on the lower surface of the angle sensor base 14 by a cushion block 10 and a second screw 8. After assembly, the distance between the sensor body and the induction block is 2-4 mm. At this time, the angle sensor 9 can measure the rotation angle of the rocker arm 7 around the hollow rotating shaft.

[0033] In the embodiment of the present utility model, the working principle of the telescopic amount measurement is as follows:

[0034] The laser displacement sensor 2 emits a laser beam onto the fan-shaped plane (laser reflection surface) on the angle sensor base 14. When the landing gear piston rod expands and contracts, the angle sensor base 14 (fixed on the landing gear piston rod) moves accordingly, resulting in the displacement of the laser reflection surface. The displacement of the laser reflection surface is the contraction displacement of the landing gear piston rod. Thus, the telescopic amount of the landing gear piston rod can be directly measured.

[0035] The working principle of the angle measurement is as follows:

[0036] When the landing gear piston rod rotates, the angle sensor base 14 rotates accordingly. At this time, the shift lever slides in the guide groove. Since the distance from the hollow rotating shaft of the rocker arm 7 (i.e., the input shaft of the angle sensor 9) to the rotation axis of the landing gear piston rod is equal to the distance to the axis of the shift lever, an isosceles triangle is formed between the swing arm of the shift lever and the angle sensor base 14, as Figure 5 shown. The point where the hollow rotating shaft is located is the vertex B of the isosceles triangle, and α is the angle measured by the angle sensor 9. The angle through which the landing gear piston rod rotates is the base angle β of the isosceles triangle. From the geometric relationship of the isosceles triangle, it is easy to obtain that α = 2β. Thus, the rotation angle of the landing gear piston rod can be measured as α / 2.

[0037] As Figure 1 and 2 shown, as a preferred embodiment of the present utility model, the laser displacement sensor 2 is fixed on the laser displacement sensor bracket 1 by a first screw 3, and the laser displacement sensor bracket 1 is fixed on the landing gear outer cylinder by a clamp 11, a third screw 12 and a fourth screw 13, and its relative position with the landing gear piston rod is fixed.

[0038] The working principle of the present utility model is:

[0039] For the landing gear angle measuring device, when the landing gear piston rod rotates, the angle sensor base 14 rotates accordingly. At this time, the lever slides in the guide groove. Since the distance from the hollow rotating shaft of the rocker arm 7 (i.e., the input shaft of the angle sensor 9) to the rotation axis of the landing gear piston rod is equal to the distance to the axis of the lever, an isosceles triangle is formed between the swing arm of the lever and the angle sensor base 14. The point where the hollow rotating shaft is located is the vertex B of the isosceles triangle, and α is the angle measured by the angle sensor 9. The angle through which the landing gear piston rod rotates is the base angle β of the isosceles triangle. From the geometric relationship of the isosceles triangle, it is easy to obtain that α = 2β. Thus, the rotation angle of the landing gear piston rod can be measured as α / 2.

[0040] The above is only the preferred embodiment of the present invention. It should be noted that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent.

Claims

1. A landing gear angle measuring device, characterized in that, Comprising: The telescopic displacement measurement part, including a laser displacement sensor bracket, a laser displacement sensor, screw one, a clamp, screw three and screw four; The angle measurement part, including a nut, an induction block fixing seat, a bearing, a rocker arm, screw two, an angle sensor, a cushion block, an angle sensor base, screw five, a hoop, screw six and a cylindrical pin; The laser displacement sensor bracket is composed of a laser displacement sensor mounting seat and a guide groove; the laser displacement sensor is fixed on the outer cylinder of the landing gear through the laser displacement sensor bracket; The angle sensor base is fixed on the piston rod of the landing gear through screw five, a hoop, screw six and a cylindrical pin; an installation hole is formed in the angle sensor base; The rocker arm is composed of a hollow rotating shaft, a lever and a rocker arm body; the hollow rotating shaft is fixed in the installation hole of the angle sensor base through a bearing; the lever is clamped in the guide groove of the laser displacement sensor bracket and is slidably connected thereto; The angle sensor is used to measure the rotation angle of the rocker arm around the hollow rotating shaft and is composed of an induction block and a sensor body; the induction block is fixed on the induction block fixing seat through a screw, and the rotating shaft on the induction block fixing seat passes through the hollow hole of the hollow rotating shaft and is fixed through a nut; the sensor body is fixed on the lower surface of the angle sensor base through a cushion block and screw two; The angle measured by the angle sensor is α, and the rotation angle of the piston rod of the landing gear is α / 2.

2. The landing gear angle measuring device according to claim 1, wherein The laser displacement sensor is fixed on the laser displacement sensor bracket through screw one, and the laser displacement sensor bracket is fixed on the outer cylinder of the landing gear through a clamp, screw three and screw four.

3. The landing gear angle measuring device according to claim 1, characterized in that, The laser reflection surface of the laser displacement sensor is the fan-shaped plane on the angle sensor base.

4. The landing gear angle measuring device according to claim 1, characterized in that The angle sensor is a non-contact inductive angle sensor.

5. The landing gear angle measuring device according to claim 1, characterized in that The distance between the sensor body and the induction block is 2 to 4 mm.

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