Tool for measuring chamfering depth of chromium layer of inner circle of outer cylinder of aircraft main landing gear

Abstract

The utility model discloses a tool for measuring the chamfer depth of an inner circle chromium layer of an outer cylinder of an aircraft main landing gear, which comprises a magnetic seat gauge used for measuring the chamfer of the inner circle chromium layer of an outer cylinder body, and further comprises a positioning cylinder body provided with a positioning assembly used for assisting the magnetic seat gauge to be positioned and installed on the positioning cylinder body. One end of the positioning cylinder is connected with a triangular supporting frame through a mounting assembly, and the positioning cylinder and the triangular supporting frame are concentrically arranged. When the measuring tool is used, the measuring tool pushed into the outer cylinder body is self-centered through the self-centering assembly, the concentric arrangement of the measuring tool and the outer cylinder body is ensured, and in the measuring process, the whole measuring tool performs rotary measurement in the outer cylinder body through the auxiliary effect of the rolling unit, so that the measuring accuracy is improved. And size measurement operation can be conveniently carried out on the maintained position in the outer cylinder body.

Description

Technical Field

[0001] The utility model relates to a measuring auxiliary instrument for a main landing gear outer cylinder, in particular to a tool for measuring the chamfer depth of the inner chrome layer of the main landing gear outer cylinder of an aircraft. Background Art

[0002] The chamfered corners of the 33mm chrome layer on the inner diameter of the main landing gear outer tube of the B737NG aircraft often corrode with use. According to the maintenance and treatment plan, the corroded areas need to be polished and removed, acid-etched and inspected, penetrant inspected, the depth and other dimensions of the polished areas measured, rotary vane shot peening, cadmium brushing, and primer spraying.

[0003] During the maintenance and measurement process, the depth of the corrosion points in the chamfered area is different, and the depth after grinding and removal is also different. The outer cylinder is fixed on the aircraft and cannot be rotated directly, which makes it inconvenient to measure the grinding position after maintenance. Utility Model Content

[0004] The utility model aims to provide a measuring tool for measuring the chamfer depth of the inner chrome layer of the outer cylinder of the main landing gear of an aircraft. The measuring tool has a simple structure and can measure the grinding position of the outer cylinder of the main landing gear of an aircraft after maintenance.

[0005] The above-mentioned object of the present invention is achieved by the following technical solutions: a measuring tool for the chamfer depth of the inner chrome layer of the outer cylinder of the main landing gear of an aircraft, comprising a magnetic base gauge for measuring the chamfer of the inner chrome layer of the outer cylinder body, and also comprising a positioning cylinder, the positioning cylinder being provided with a positioning assembly for assisting the magnetic base gauge in positioning and installing on the positioning cylinder, one end of the positioning cylinder being connected to a triangular support frame through a mounting assembly, the positioning cylinder and the triangular support frame being concentrically arranged, the triangular support frame being in a centrally divergent shape, and the triangular support frame being provided with a self-centering assembly for self-centering measurement inside the outer cylinder body;

[0006] The self-centering component includes three groups of slide grooves opened on the triangular support frame, and the three groups of slide grooves are centrally divergent on the triangular support frame, and there is an angle of 120° between adjacent slide grooves. A support plate is slidably connected in the slide groove, and an elastic component for elastically pushing the support plate is provided inside the slide groove. The front end of the support plate is provided with a rolling unit for rolling inside the outer cylinder body during the centering support process.

[0007] When the measuring tool of the utility model is used, the measuring tool pushed into the interior of the outer cylinder body is self-centered by the self-centering component, thereby ensuring a concentric arrangement with the outer cylinder body. In addition, during the measurement process, the entire measuring tool is rotated inside the outer cylinder body for measurement through the auxiliary effect of the rolling unit, thereby facilitating the dimensional measurement operation of the position inside the outer cylinder body of the aircraft main landing gear after maintenance.

[0008] In the present invention, the rolling unit comprises a rolling groove provided at the front end of the support plate, and a rolling pin is rotatably connected to the rolling groove.

[0009] In the present invention, the elastic component includes a mounting groove opened on the support plate, a mounting plate is provided inside the mounting groove, the mounting plate is fixed to the inside of the slide groove, and a spring is connected between the inner wall of the mounting groove and the mounting plate.

[0010] A mounting pin is fixed on the inner wall of the mounting groove and the mounting plate, and the spring sleeve is arranged on the outer side of the mounting pin.

[0011] In the present invention, the positioning assembly includes a positioning groove opened on the upper end of the positioning cylinder for positioning the magnetic base table. The upper end of the positioning cylinder is fixed with a positioning plate for assisting the magnetic base table in positioning after placement. A threaded hole is opened on one side of the positioning plate and the magnetic base table and is limited by a bolt connection.

[0012] The installation assembly includes a threaded sleeve fixed on the upper end of the triangular support frame, and a threaded pin matched with the inside of the threaded sleeve is fixed on the lower end of the positioning cylinder.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] When the measuring tool of the present invention is in use, the self-centering component enables the measuring tool pushed into the interior of the outer cylinder body to perform self-centering, thereby ensuring a concentric arrangement with the outer cylinder body. In addition, during the measurement process, the auxiliary action of the rolling unit enables the entire measuring tool to be rotated inside the outer cylinder body for measurement, thereby facilitating dimensional measurement operations on the position inside the outer cylinder body after maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods.

[0016] Figure 1 This is a reference diagram of the measuring tool of the utility model installed in the outer cylinder;

[0017] Figure 2 This is a schematic diagram of the overall structure of the measuring tool of the utility model;

[0018] Figure 3 This is a schematic structural diagram of the self-centering component in the measuring tool of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the elastic force component in the measuring tool of the utility model;

[0020] Figure 5 This is a structural diagram of the installation components in the measuring tool of the utility model.

[0021] In the figure: 1 - magnetic seat table; 2 - outer cylinder body; 3 - positioning cylinder body; 401 - positioning groove; 402 - positioning plate; 403 - bolt; 5 - triangular support frame; 601 - threaded sleeve; 602 - threaded pin; 701 - sliding groove; 702 - support plate; 801 - rolling groove; 802 - rolling pin; 901 - mounting groove; 902 - mounting plate; 903 - spring; 904 - mounting pin. DETAILED DESCRIPTION

[0022] As shown in the figure, the measuring tool for the inner circle chromium layer chamfer depth of the outer cylinder of the main landing gear of the aircraft, the aircraft of the embodiment is B737NG type aircraft, and the tool can also be used for measuring the inner circle chromium layer chamfer depth of the outer cylinder of the main landing gear of other types of civil aircraft. The measuring tool comprises a magnetic seat table 1 for measuring the inner circle chromium layer chamfer of the outer cylinder body 2. Figures 1 to 5

[0023] It should be noted here that a dial gauge is used on the magnetic seat table 1.

[0024] The measuring tool further comprises a positioning cylinder body 3, the positioning cylinder body 3 is provided with a positioning assembly for assisting the positioning and installation of the magnetic seat table 1 on the positioning cylinder body 3, one end of the positioning cylinder body 3 is connected with a triangular support frame 5 through a mounting assembly, the positioning cylinder body 3 and the triangular support frame 5 are concentrically arranged, the triangular support frame 5 is in a central divergent shape, and a self-centering assembly for self-centering measurement inside the outer cylinder body 2 is arranged on the triangular support frame 5;

[0025] The self-centering assembly comprises three sets of sliding grooves 701 opened on the triangular support frame 5, and the three sets of sliding grooves 701 are evenly arranged in a central divergent shape on the triangular support frame 5, there is an included angle of 120° between adjacent sliding grooves 701, a support plate 702 is slidably connected in the sliding groove 701, and an elastic assembly for elastically pushing the support plate 702 is arranged inside the sliding groove 701, and a rolling unit for rolling inside the outer cylinder body 2 during centering support is arranged at the front end of the support plate 702;

[0026] When the measuring tool is used, the self-centering assembly makes the measuring tool pushed into the inside of the outer cylinder body 2 self-centering, ensures the concentric arrangement with the outer cylinder body 2, and in the process of measurement, the rolling unit assists the whole measuring tool to rotate for measurement inside the outer cylinder body 2, which is convenient for size measurement operation on the position after maintenance inside the outer cylinder body 2.

[0027] The rolling unit comprises a rolling groove 801 opened at the front end of the support plate 702, and a rolling pin 802 is rotatably connected on the rolling groove 801; through the rolling groove 801 and the rolling pin 802, it is convenient to assist the rotating measurement of the measuring tool inside the outer cylinder body 2.

[0028] ​The elastic assembly comprises a mounting groove 901 formed on the support plate 702, the inside of the mounting groove 901 is provided with a mounting plate 902, the mounting plate 902 is fixed with the inside of the sliding groove 701, and the inner wall of the mounting groove 901 is connected with the mounting plate 902. The spring 903 is deformed under stress during the sliding of the support plate 702 to generate elastic force, and the elastic force of the spring 903 facilitates the resetting of the support plate 702 after movement.

[0029] The inner wall of the mounting groove 901 and the mounting plate 902 are fixed with a mounting pin 904, and the spring 903 is sleeved outside the mounting pin 904; the mounting pin 904 assists the positioning and installation of the spring 903.

[0030] The positioning assembly comprises a positioning groove 401 formed on the upper end of the positioning cylinder 3 for positioning and placing the magnetic base table 1, the upper end of the positioning cylinder 3 is fixed with a positioning plate 402 for assisting the positioning of the magnetic base table 1 after placement, the positioning plate 402 is provided with a threaded hole on one side of the magnetic base table 1 and is connected and limited by a bolt 403; the base of the magnetic base table 1 is positioned and placed on the positioning groove 401 and abuts against the positioning plate 402 on one side, the magnetic base table 1 is positioned, and the positioning plate 402 and the magnetic base table 1 are connected and limited by the bolt 403 after positioning.

[0031] The mounting assembly comprises a threaded sleeve 601 fixed on the upper end of the triangular support frame 5, and the lower end of the positioning cylinder 3 is fixed with a threaded pin 602 matched with the inside of the threaded sleeve 601; the threaded sleeve 601 and the threaded pin 602 facilitate the mounting and connection between the triangular support frame 5 and the positioning cylinder 3.

[0032] When the measuring tool is used, the magnetic base table 1 is positioned and mounted on the positioning cylinder 3 by the positioning assembly and is limited, after positioning and mounting, the magnetic base table 1 and the positioning cylinder 3 are in a concentric state, after the magnetic base table 1 is mounted, the triangular support frame 5 and the positioning cylinder 3 are mounted and connected by the mounting assembly;

[0033] After the magnetic base table 1 and the triangular support frame 5 are mounted, the assembly of the entire measuring tool is completed, after assembly, the entire measuring tool is pushed towards the inside of the outer cylinder body 2, during the pushing process, three sets of support plates 702 are pushed to shrink towards the inside of the triangular support frame 5, when the triangular support frame 5 is inside the outer cylinder body 2, the pushing and shrinking of the three sets of support plates 702 are released, the three sets of support plates 702 move towards the outside of the triangular support frame 5 under the action of the elastic assembly, during the movement, the front ends of the three sets of support plates 702 abut against the inner wall of the outer cylinder body 2, the measuring tool pushed into the outer cylinder body 2 is self-centered through the abutting action of the three sets of rolling pins 802, and the concentric arrangement with the outer cylinder body 2 is ensured;

[0034] After the measuring tool is self-centered inside the outer cylinder body 2, the dial head on the magnetic seat 1 is abutted with the position to be detected inside the outer cylinder body 2, and then the rolling action of each group of rolling pins 802 and the inner wall of the outer cylinder body 2 makes the whole measuring tool rotate inside the outer cylinder body 2, so as to facilitate the size measurement operation on the position after the maintenance of the outer cylinder body 2.

Claims

1. A tool for measuring the chamfer depth of the inner chrome layer of the outer cylinder of the main landing gear of an aircraft, comprising: A magnetic base gauge (1) for measuring the chamfer of the inner chromium layer of an outer cylinder body (2); characterized in that the measuring tool further comprises: A positioning cylinder (3), wherein the positioning cylinder (3) is provided with a positioning assembly for assisting the magnetic base table (1) in positioning and mounting on the positioning cylinder (3), one end of the positioning cylinder (3) is connected to a triangular support frame (5) via a mounting assembly, the positioning cylinder (3) and the triangular support frame (5) are concentrically arranged, the triangular support frame (5) is centrally divergent, and the triangular support frame (5) is provided with a self-centering assembly for self-centering measurement inside the outer cylinder body (2); The self-centering component comprises three groups of slide grooves (701) provided on the triangular support frame (5), and the three groups of slide grooves (701) are centrally divergent on the triangular support frame (5), and an angle of 120° exists between adjacent slide grooves (701), a support plate (702) is slidably connected in the slide groove (701), an elastic component for elastically pushing the support plate (702) is provided inside the slide groove (701), and a rolling unit for rolling inside the outer cylinder body (2) during the centering support process is provided at the front end of the support plate (702).

2. The measuring tool for the chamfer depth of the inner chrome layer of the outer cylinder of the main landing gear of an aircraft according to claim 1, characterized in that: The rolling unit comprises a rolling groove (801) opened at the front end of the support plate (702), and a rolling pin (802) is rotatably connected to the rolling groove (801).

3. The measuring tool for the chamfer depth of the inner chrome layer of the outer cylinder of the main landing gear of an aircraft according to claim 1, characterized in that: The elastic component includes a mounting groove (901) provided on the support plate (702), a mounting plate (902) is provided inside the mounting groove (901), the mounting plate (902) is fixed to the inside of the slide groove (701), and a spring (903) is connected between the inner wall of the mounting groove (901) and the mounting plate (902).

4. The measuring tool for the chamfer depth of the inner chrome layer of the outer cylinder of the main landing gear of an aircraft according to claim 3, characterized in that: A mounting pin (904) is fixed on the inner wall of the mounting groove (901) and the mounting plate (902), and the spring (903) is sleeved on the outside of the mounting pin (904).

5. The measuring tool for the chamfer depth of the inner chrome layer of the outer cylinder of the main landing gear of an aircraft according to claim 1, characterized in that: The positioning assembly comprises a positioning groove (401) provided on the upper end of the positioning cylinder (3) for positioning the magnetic base meter (1). A positioning plate (402) is fixed to the upper end of the positioning cylinder (3) for assisting the magnetic base meter (1) in positioning after placement. A threaded hole is provided on one side of the positioning plate (402) and the magnetic base meter (1) and is connected to the magnetic base meter (1) by a bolt (403) for limiting positioning.

6. The measuring tool for the chamfer depth of the inner chrome layer of the outer cylinder of the main landing gear of an aircraft according to claim 1, characterized in that: The mounting assembly comprises a threaded sleeve (601) fixed to the upper end of the triangular support frame (5), and a threaded pin (602) matched with the interior of the threaded sleeve (601) is fixed to the lower end of the positioning cylinder (3).

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