CN112648981B

CN112648981B - Method for measuring swing quantity of rotating mechanism in motion process based on laser positioning

Info

Publication number: CN112648981B
Application number: CN202011397415.9A
Authority: CN
Inventors: 陈卓; 李翔; 傅波; 王明海; 汪跃峰; 徐林
Original assignee: AVIC Chengdu Aircraft Design and Research Institute
Current assignee: AVIC Chengdu Aircraft Design and Research Institute
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2023-01-13
Anticipated expiration: 2040-12-04
Also published as: CN112648981A

Abstract

The invention belongs to the technical field of displacement measurement, and relates to a method for measuring the swing quantity of a rotating mechanism in a motion process based on laser positioning; the length scales are marked on the rotating mechanism; a camera is arranged on the rotating mechanism, and the camera is adjusted to focus on the scale; mounting a laser source on the ground or other object that is stationary relative to the ground; a laser source is utilized to emit laser beams, the laser beams are adjusted to be parallel to the rotating surface of the rotating mechanism, and laser marks are formed on the scales; when the rotating mechanism swings, the laser mark swings in the same amount and in the opposite direction relative to the scale, and the swinging amount of the rotating mechanism can be obtained by recording the swinging amount through the camera.

Description

Method for measuring swing quantity of rotating mechanism in motion process based on laser positioning

Technical Field

The invention belongs to the technical field of displacement measurement, and relates to a method for measuring swing quantity of a rotating mechanism in a motion process based on laser positioning.

Background

A rotary mechanism is a mechanism whose motion can be broken down into rotary motion and other types of motion during operation.

During its movement, it generally oscillates in the direction normal to the plane of rotation, which oscillation is often detrimental to the mechanism itself. In order to control the swing, the swing amount of the rotating mechanism during the movement process needs to be measured. Generally, the measurement is carried out by adopting a laser displacement sensor and a stay wire displacement sensor.

The prior art has the following defects:

the sensor needs to follow the mechanism synchronously, and a follow-up device is difficult to realize; and the factors of follow-up advance, follow-up lag, follow-up rotation surface deviation and the like all cause larger measurement errors.

Disclosure of Invention

The purpose of the invention is as follows: in order to solve the technical problem, a measuring method avoiding adopting a follow-up device is designed.

The technical scheme of the invention is as follows: a method for measuring swing quantity of a rotating mechanism in a motion process based on laser positioning is characterized in that length scales are marked on the rotating mechanism; a camera is arranged on the rotating mechanism, and the camera is adjusted to focus on the scale; mounting a laser source on the ground or other object that is stationary relative to the ground; a laser source is used for emitting laser beams, the laser beams are adjusted to be parallel to the rotating surface of the rotating mechanism, and laser marks are formed on the scales; when the rotating mechanism swings, the laser marks swing reversely in equal amount relative to the scales, and the swinging amount of the rotating mechanism can be obtained by recording the swinging amount through the camera.

The length scale marks are on a surface of the mechanism perpendicular to the plane of rotation.

The length scales are along the swing direction of the mechanism.

The length scale range is between 0mm and 100mm, and the precision is better than 1mm.

The adjusting camera focuses on the scale, and the video picture can cover the full scale range.

The laser beam is a planar radial laser beam.

The laser mark covers the whole process that the length scale rotates along with the mechanism.

The invention has the beneficial effects that:

the measuring device is simple, a follow-up device is not needed, and measuring errors caused by factors such as follow-up advance, follow-up lag, follow-up rotation surface deviation and the like are avoided.

Drawings

FIG. 1 is a schematic diagram of measuring swing amount of a rotating mechanism in a movement process based on laser positioning

FIG. 2 is a schematic diagram of measuring the swing amount of an aircraft canopy during opening and closing based on laser positioning

Wherein: 1-rotating mechanism, 2-length scale, 3-laser mark, 4-camera, 5-laser beam, 6-laser source, 7-ruler, 8-hatch cover, 9-rear hinge, 10-ground, 11-hatch cover table and 12-laser line marking instrument

Detailed Description

As shown in fig. 2, the method is applied to the measurement of the swing amount of the airplane canopy during the opening and closing process, and the swing amount of the center point of the front Edge (EF) during the opening and closing process of the canopy 8 rotating around the rear hinge 9 is measured. The hatch cover 11 and the laser line marker 12 are fixed to the ground by bolts, pressure beams, and the like. The straight edge 7 is glued 502 to the front edge of the hatch in the direction of oscillation. Meanwhile, the camera 4 is fixed at the front edge by using a special tool, and the camera 4 is adjusted to focus on the scale of the ruler 7 and cover the full scale range. The laser striping machine 12 is opened, a plane type radial laser beam 5 is emitted, the laser beam is adjusted to be parallel to the rotating surface of the hatch cover 8, a laser mark 3 is formed in the middle point of the scale of the straight scale 7 (the AB middle point, the CD middle point and the EF middle point are marked in advance, and the laser beam direction is adjusted to pass through the 3 middle points at the same time), and the laser mark 3 can cover the whole process that the scale of the straight scale rotates along with the hatch cover. The hatch cover 8 swings around the rear hinge 9 when the switch is rotated, the laser mark 3 swings in the same amount and in the opposite direction relative to the scale of the straight scale 7, and the swing amount is recorded by the camera 4 and is led out, so that the swing amount of the midpoint of the front edge of the hatch cover 8 can be obtained.

The method for measuring the swing of the hatch cover avoids the problem that a follow-up device needs to be arranged when a laser displacement sensor or a stay wire displacement sensor is used for measuring, and avoids measurement errors caused by factors such as follow-up advance, follow-up lag, follow-up rotation surface deviation and the like.

Claims

1. A method for measuring swing quantity of a rotating mechanism in a motion process based on laser positioning is characterized in that length scales are marked on the rotating mechanism; a camera is arranged on the rotating mechanism, and the camera is adjusted to focus on the scale; mounting a laser source on the ground or other object that is stationary relative to the ground; a laser source is used for emitting laser beams, the laser beams are adjusted to be parallel to the rotating surface of the rotating mechanism, and laser marks are formed on the scales; when the rotating mechanism swings, the laser mark swings reversely in an equal amount relative to the scale, and the swinging amount of the rotating mechanism can be obtained by recording the swinging amount by using the camera; the method specifically comprises the following steps:

measuring the swinging amount of the midpoint of the front edge EF in the process of rotating the switch of the hatch cover (8) around the rear hinge (9); the hatch cover platform (11) and the laser graticule instrument (12) are fixed on the ground through bolts and pressing beams, a ruler (7) is adhered to the front edge of the hatch cover along the swinging direction by 502 glue, a camera (4) is fixed on the front edge, and the camera (4) is adjusted to focus on the scale of the ruler (7) and cover the full scale range of the scale; opening a laser graticule instrument (12), emitting a plane type radial laser beam (5), adjusting the laser beam to enable the laser beam to be parallel to the rotation surface of the hatch cover (8) and form a laser mark (3) at the middle point of the scale of the straight scale (7), marking the middle point AB of the rear hinge, the middle point of the CD of the corresponding part of the hatch cover platform and the front Edge (EF) of the hatch cover and the middle point EF of the CD in advance, and adjusting the direction of the laser beam to enable the laser mark (3) to cover the whole process that the scale of the straight scale rotates along with the hatch cover through the 3 middle points; the hatch cover (8) swings around the rear hinge (9) when rotating the switch, the laser mark (3) swings in the same amount and in the opposite direction relative to the scale of the ruler (7), and the swing amount is recorded by the camera (4) and is led out, so that the swing amount of the midpoint of the front edge of the hatch cover (8) can be obtained.

2. The laser positioning-based rotary mechanism motion process oscillation amount measurement method of claim 1, wherein the length scale mark is on a surface of the mechanism perpendicular to the plane of rotation.

3. The laser positioning-based rotary mechanism motion process oscillation amount measurement method of claim 1, wherein the length scale is along a mechanism oscillation direction.

4. The method for measuring the swing quantity of the rotary mechanism based on the laser positioning during the motion process as claimed in claim 1, wherein the length scale range is between 0mm and 100mm, and the precision is better than 1mm.

5. The method of claim 1, wherein the laser beam is a planar radial laser beam.