Method for measuring camber of crane main girder by laser

Abstract

The invention discloses a method for measuring upward camber of the girder of a crane by utilizing laser. In the method, a laser self-leveling plumb aligner and a digital display light target are included. The method is as below: the plumb aligner is placed on the girder except the position of a measured point, and a level bubble is adjusted to be in the middle of a circular ring so as to achieve self-leveling; a laser power supply is switched on, and the plumb aligner is rotated to be aligned with the light target so that level reading can begin; firstly, zero setting of the light target is a first point reading, then, a second point is aligned with the light target for purpose of reading, and by parity of reasoning, the level reading of a digital display caliper is obtained and then recorded; and the upward camber value of the girder of the crane is calculated, and by recording a group of data, a special data processing system for the plumb aligner is used for drawing an upward camber curve of the girder. The measurement method is convenient, fast and highly accurate.

Description

technical field [0001] The invention relates to a detection method of a main girder of a crane, in particular to a method for measuring the camber of the main girder of a crane by laser. Background technique [0002] The measurement of the crown of the main girder of the crane mainly measures whether the crown of the crane is qualified according to the relevant national standards during the use of the crane. The measurement range of crown on the crane is 50~+50mm, and the working distance is ≤50m; the error of the digital scale is 0.02mm. [0003] Usually, in the process of measuring the camber of the main girder of the crane, it is necessary to use an optical level, a tower ruler and auxiliary tool steel wire, a spring scale, a steel ruler, and a contour block, etc.; At the point and mid-span, use the optical level to read the data, calculate the average value of the readings at the two points at the end of the crane main girder minus the reading at the mid-span of the cra...

AI Technical Summary

Problems solved by technology

Obviously, there are many defects and inconveniences in the above-mentioned measurement method, such as blind spots during measurement, the tower foot is greatly affected by the vibration of the crane support, electric shock accidents are likely to occur when the metal tower foot is placed, and it is heavy to carry, which affects long-term work at heights The safety of personnel, because the light is generally dark when the method is measured on site, the reading of the measured value is prone to errors, and it can only measure the camber at the middle point of the main beam of the crane, and cannot perform multi-point measurement on the main beam of the crane; Therefore, the above measurement method is time-consuming and laborious and cannot achieve satisfactory measurement accuracy.