A method of monitoring the bending degree of the boom

Abstract

The invention discloses a method for monitoring bending angle of a boom. The method comprises the following steps of: pulling a wire rope cable between the tail section and the head section of the boom, and tensioning one end or both ends of the wire rope cable by spring devices; connecting the wire rope cable with the pipe truss of the surrounding boom at a distance through a plurality of rope displacement sensors; connecting all the rope displacement sensors with a control system through signal lines and data acquisition cards; setting a base point to zero all the rope displacement sensors when the boom is unloaded; bending deformation occurs when the boom is hoisted, reading the displacement of the wire rope cable at each measurement point relative to the boom pipe truss by the data acquisition cards and the control system; and obtaining the bending deformation of the middle part of the boom pipe truss relative to the two ends of the boom pipe truss, that is, the bending degree of the boom. The method for monitoring the bending angle of the boom simply and effectively measures the bending degree of the boom, provides the necessary condition for controlling the straightness of the boom in a safe range in real time, and greatly reduces the occurrence of accidents.

Description

technical field [0001] The invention belongs to the field of cranes, and relates to an auxiliary device of a crane arm, in particular to a method for monitoring the bending degree of the arm. Background technique [0002] As an important stress-bearing component of crawler cranes, the boom maintains straightness is very important for safe use. Due to the long length of the jib after assembly, it is also affected by its own gravity, lifting load, the force of the pull arm rope and the hook rope, and the inertial force. It is inevitable that there will be changes in straightness during use, that is, changes in the straightness of each direction. Curvature. The existing technology is mainly to improve the stiffness of the boom itself, and then add a waist rope to control the deflection under the long boom condition, and no measures have been taken to control the side bending. From the perspective of safe use of equipment, it is urgent to solve the problem of real-time measure...

AI Technical Summary

Problems solved by technology

[0003] The boom consists of a head section, a tail section and several intermediate sections. Each section of the boom is fixedly connected by a chord, a web and an oblique support rod. When the boom is bent, the downward deflection is downward, and the upward is The upper camber is the side camber to both sides, but no matter how you bend the first and last two sections, they will not bend, and the line between the first and last two sections will be offset when bending, so the measurement of the boom relative to the first and last two sections The bending degree of the boom can be obtained by measuring the deviation degree of the connection line between the booms, which provides a basis for the adjustment of the boom bending control. However, due to the complexity of the boom tube truss and the problem of the working environment, there is still a lack of effective measurement of the boom in the existing technology. Low-Cost Viable Measure of Curvature

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