Online monitoring system and method of deflection of portal crane girder

Abstract

The invention relates to an online monitoring system and an online monitoring method of the deflection of a portal crane girder, which belong to the technical field of deflection monitoring of the portal crane girder. The system comprises a reflecting device, a pulse distance measuring device, a data recording device and a data analyzing and processing device, wherein the reflecting device is installed on a lower cover plate of the portal crane girder, the pulse distance measuring device is installed on a support leg of a portal crane, the output end of the pulse distance measuring device is connected with the input end of the data recording device, and the output end of the data recording device is connected with the input end of the data analyzing and processing device. According to the system, the deflection change of the portal crane girder can be monitored in real time in the process of operation, the whole management level is increased, the safe operation of the crane can be greatly guaranteed, the personal safety of working personnel is protected, and accidents are avoided. Compared with the prior art, the system has the advantages of reasonable design, convenience in use and capability of stable long-term real-time monitoring and detection.

Description

technical field [0001] The invention belongs to the technical field of monitoring the deflection of a main girder of a gantry crane, and in particular relates to an online monitoring system and method for the deflection of a main girder of a gantry crane. Background technique [0002] In order to ensure the safe use of the gantry crane, it is often necessary to measure its main technical parameters - camber, warp and deflection during its use and inspection; at present, the measurement of the deflection of the main girder of the crane is mainly by drawing steel wires method, theodolite method, leveling method, connecting device method, laser rangefinder, using steel wire rope and tape measure or level instrument and tape measure for measurement, manual alignment during measurement, human eye interpretation, and due to the downward deflection caused by the self-weight of the steel wire, this This method must consider the correction value, which is more troublesome, and there ...

AI Technical Summary

Problems solved by technology

[0002] In order to ensure the safe use of the gantry crane, it is often necessary to measure its main technical parameters - camber, warp and deflection during its use and inspection; at present, the measurement of the deflection of the main girder of the crane is mainly by drawing steel wires method, theodolite method, leveling method, connecting device method, laser rangefinder, using steel wire rope and tape measure or level instrument and tape measure for measurement, manual alignment during measurement, human eye interpretation, and due to the downward deflection caused by the self-weight of the steel wire, this This method must consider the correction value, which is more troublesome, and there are many intermediate links in the measurement, which are greatly affected by human factors. It not only needs to climb but also makes the data have a certain subjectivity, and the accuracy is low; The workload of the ruler is heavy, and the single-girder crane is not suitable for sticking and picking, so it is inconvenient to use; the level gauge method is also limited by the height of the crane in addition to the site restrictions; the laser rangefinder method is to use the laser rangefinder from the ground to the crane. Dot the mid-span position of the edge plate to measure the distance change value from this point to the laser rangefinder during the process of the crane from no load to rated load. The measurement process will affect the production operation of the crane; the data obtained by the above method can only illustrate the test The working status of the structure at the time point selected by the personnel cannot explain the long-term working status of the entire equipment, cannot monitor the stress structure for a long time, and cannot remind the staff at the first time to maintain the structure that may be in a dangerous working state, especially in Failure to provide instant information to production managers in the event of major accidents or serious structural safety hazards

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