Special platform for measuring installation angle of tail rotor blade

Abstract

The utility model relates to the technical field of tail rotor blade mounting angle measurement, in particular to a special platform for measuring a tail rotor blade mounting angle. The special platform comprises a measuring platform and a lengthening platform; the measuring platform comprises a mounting part and a measuring part, the mounting part is perpendicular to the measuring part, the mounting part is connected with the tail rotor hub connecting piece, and the measuring part is fixedly connected with the lengthened platform; an angle measuring instrument on the measuring part is arranged along the vertical direction of the center line of the airplane and is used for measuring the mounting angle of the tail rotor blade relative to the tail rotor hub connecting piece; the angle measuring instrument on the lengthened platform is placed in the horizontal direction of the center line of the airplane and used for measuring the included angle between the tail rotor blade pitch-variable axis and the horizontal plane.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring the installation angle of a tail rotor blade, and particularly relates to a special platform for measuring the installation angle of a tail rotor blade. Background Art

[0002] Before installing a helicopter tail rotor blade, it is necessary to measure the pitch installation angle of each connecting part of the tail rotor hub to ensure that the pitch angle meets the design requirements in the reference state after the tail rotor blade is installed. The connecting part between the tail rotor hub connecting part and the central part of the tail rotor hub is connected by an elastic bearing, which belongs to a flexible connection. The installation surface at the connection cannot be used as an angle measurement plane, and there is no other plane on the tail rotor hub connecting part that can fit with the quadrant. If measured directly, the stability of the quadrant is insufficient, it is easy to shake, and the measurement data error is too large. This measurement method cannot meet the design requirements for the installation angle of the tail rotor blade. Summary of the Invention

[0003] Object of the Invention: In order to overcome the problem of measuring the accuracy of the installation angle of the tail rotor blade, the utility model provides a special platform for measuring the installation angle of the tail rotor blade.

[0004] Technical Solution

[0005] Provide a special platform for measuring the installation angle of a tail rotor blade, including: a measurement platform and an extended platform;

[0006] The measurement platform includes an installation part and a measurement part. The installation part is perpendicular to the measurement part. The installation part is connected to the tail rotor hub connecting part, and the measurement part is fixedly connected to the extended platform;

[0007] The angle measuring instrument on the measurement part is placed along the vertical direction of the aircraft center line, and is used to measure the installation angle of the tail rotor blade relative to the tail rotor hub connecting part;

[0008] The angle measuring instrument on the extended platform is placed along the horizontal direction of the aircraft center line, and is used to measure the included angle between the pitch axis of the tail rotor blade and the horizontal plane.

[0009] The extended platform includes an extended measurement part and a connecting part. The extended measurement part is in an L-shaped structure; the longitudinal arm of the extended measurement part is parallel to the aircraft center line and is used to provide a reference for measuring the angle, and the transverse arm is used to place the angle measuring instrument;

[0010] The connecting part extends outward from one end of the bottom surface of the transverse arm, and the upper surface of the connecting part is lower than the upper surface of the extended measurement part.

[0011] The measurement part is in an L-shaped structure and includes a bottom plate and a baffle; the baffle is located on the side of the bottom plate closest to the central part of the tail rotor hub and is used to provide a reference for measuring the installation angle of the tail rotor, and the bottom plate is used to place the angle measuring instrument.

[0012] The special platform further includes: a connecting bolt between platforms;

[0013] The connecting portion is fixedly connected to the lower end surface of the base plate by inter-platform connecting bolts.

[0014] The mounting portion is fixed to the tail rotor hub connector by two mounting bolts on the tail rotor blade.

[0015] The angle measuring instrument is a quadrant.

[0016] Beneficial effects:

[0017] The present application connects the special platform for measuring the installation angle of the tail rotor blade to the corresponding hub connector according to the designed measurement position, and fixes it with tail rotor blade installation bolts. The plane angle of the quadrant placed on the platform is the installation angle of the tail rotor blade relative to the tail rotor hub connector, and the plane angle of the adapter extension platform used is the angle between the blade pitch axis and the horizontal plane, thereby ensuring the stability of the special platform for measuring the installation angle of the tail rotor blade; the quadrant is placed directly on the measurement platform, and the installation angle of the tail rotor blade can be directly read according to the direction in which the quadrant is placed; the quadrant is placed on the extension platform along the heading, so that the angle between the blade pitch axis and the ground can be directly read, which greatly improves the work efficiency of the measurement work and the accuracy of the measured angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the installation of the present utility model.

[0019] Figure 2 This is a schematic diagram of the extended platform of the present utility model. DETAILED DESCRIPTION

[0020] The present invention provides a special platform for measuring the installation angle of tail rotor blades. Figure 1-2 As shown, it includes: a measuring platform 1 and an extension platform 2;

[0021] The measuring platform includes a mounting portion and a measuring portion, wherein the mounting portion is perpendicular to the measuring portion, the mounting portion is connected to the tail rotor hub connector, and the measuring portion is fixedly connected to the extended platform;

[0022] The angle measuring instrument on the measuring part is placed vertically along the centerline of the aircraft and is used to measure the installation angle of the tail rotor blade relative to the tail rotor hub connector;

[0023] The angle measuring instrument on the extended platform is placed horizontally along the centerline of the aircraft and is used to measure the angle between the tail rotor blade pitch axis and the horizontal plane.

[0024] The extended platform includes an extended measuring section and a connecting section. The extended measuring section is L-shaped. The longitudinal arm of the extended measuring section is parallel to the aircraft centerline and is used to provide a reference for measuring angles. The transverse arm is used to place the angle measuring instrument.

[0025] The connecting portion is extended outward from one end of the bottom surface of the horizontal arm, and the upper surface of the connecting portion is lower than the upper surface of the extended measuring portion.

[0026] The measuring part has an L-shaped structure and includes a bottom plate and a baffle; the baffle is located on the side of the bottom plate closest to the center piece of the tail rotor hub and is used to provide a reference for measuring the installation angle of the tail rotor; the bottom plate is used to place the angle measuring instrument.

[0027] The special platform further includes: an inter-platform connecting bolt 3;

[0028] The connecting part is fixedly connected to the lower end surface of the bottom plate through the inter-platform connecting bolt.

[0029] The installation part is fixed to the tail rotor hub connecting part through two installation bolts 4 of the tail rotor blade.

[0030] The angle measuring instrument is a quadrant.

[0031] The measuring platform is used for the placement measurement and measurement positioning of the quadrant. By borrowing the installation positioning holes of the tail rotor blade, it is connected to the tail rotor hub connecting part using the installation bolts of the tail rotor blade;

[0032] The extended platform is used for the placement measurement of the quadrant and can measure the angle between the pitch axis of the tail rotor hub connecting part and the horizontal plane.

[0033] The inter-platform connecting bolt is used to connect and fix the measuring platform and the extended platform.

Claims

1. A special platform for measuring the installation angle of a tail rotor blade, characterized in that, Comprising: A measuring platform and an extended platform; The measuring platform includes a mounting part and a measuring part. The mounting part is perpendicular to the measuring part. The mounting part is connected to the tail rotor hub connecting piece, and the measuring part is fixedly connected to the extended platform; The angle measuring instrument on the measuring part is placed in the direction perpendicular to the aircraft center line for measuring the installation angle of the tail rotor blade relative to the tail rotor hub connecting piece; The angle measuring instrument on the extended platform is placed in the horizontal direction along the aircraft center line for measuring the included angle between the pitch axis of the tail rotor blade and the horizontal plane.

2. The dedicated platform according to claim 1, wherein The extended platform includes an extended measuring part and a connecting part. The extended measuring part is in an L-shaped structure; the longitudinal arm of the extended measuring part is parallel to the aircraft center line for providing a reference for measuring the angle, and the transverse arm is used for placing the angle measuring instrument; The connecting part extends outward from one end of the bottom surface of the transverse arm, and the upper surface of the connecting part is lower than the upper surface of the extended measuring part.

3. The dedicated platform according to claim 2, characterized in that, The measuring part is in an L-shaped structure and includes a bottom plate and a baffle; the baffle is located on the side of the bottom plate closest to the center piece of the tail rotor hub for providing a reference for measuring the installation angle of the tail rotor, and the bottom plate is used for placing the angle measuring instrument.

4. The dedicated platform according to claim 3, characterized in that, Also including: Inter-platform connection bolts; The connecting part and the lower end surface of the bottom plate are fixedly connected by inter-platform connection bolts.

5. The dedicated platform according to claim 1, characterized in that, The mounting part is fixed on the tail rotor hub connecting piece through two mounting bolts of the tail rotor blade.

6. The dedicated platform according to claim 1, wherein The angle measuring instrument is a quadrant.

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