Measuring method of loading quality of hoisting machine

Abstract

The invention relates to a measuring method of loading quality of a hoisting machine. The main technical feature of the measuring method is that the method includes a first step of obtaining the following data of: (1) electric energy Pe input by a system when the hoisting machine is in load, and stator current i1 when the hoisting machine is in load; (2) electric energy Pe (0) input by the system when the hoisting machine is in no load, and stator current i1(0) when the hoisting machine is in no load; (3) ascensional velocity V0 when the hoisting machine is in no load; (4) stator resistance R1 of a hoisting motor of the hoisting machine; (5) accelerated velocity A when the hoisting machine starts; (6) the value of the acceleration gravity g which is 9.8 m / s; and delivering the data into a microprocessor. The method includes a second step of calculating the loading quality of the hoisting machine according to the following mathematical model: m= [Pe-Pe(0)-3*(i12-i1(0)2)*R1] / [g+a]V0. The method in the invention has a reasonable design based on scientific principles as well as a high practical applicability in engineering design. The method has the characteristics of being quick in response, high in accuracy, easy in realization, convenient in installation and utilization and the like. The method also has a wide application range.

Description

technical field [0001] The invention belongs to the field of cranes, in particular to a method for measuring the load quality of a crane. Background technique [0002] Cranes are widely used in freight yards, workshops and other places to lift goods. The working characteristics of the crane are frequent start-up, uncertain load quality, and overload operation often occurs during the work process. When the crane is overloaded, the components of the crane will be damaged, the service life of the crane will be shortened, and in severe cases, it will cause safety accidents. In order to prevent the damage to the crane caused by the overload operation of the crane, avoid the dangerous accident of the crane, and prolong the service life of the crane, it is necessary to limit the overload of the crane. The method of overloading the crane is usually to install an overload protection device on the crane. [0003] The existing overload protection device mainly adopts the following tw...

AI Technical Summary

Problems solved by technology

[0003] The existing overload protection device mainly adopts the following two methods to realize the measurement function of the load quality: (1) The method of installing a force sensor is adopted, and its working principle is: the mechanical deformation of the elastic body caused by the load makes the elastic body fixed in the elastic body The resistance value of the strain gauge changes, and the load mass is measured by using the functional relationship between the resistance value of the strain gauge and the load mass. The problem with this method is that in practical applications, the selection of the force take-off point will be limited by the structure of the crane. , so that the measurement accuracy and stability of the overload protection device are affected. At the same time, the installation of the force sensor needs to change the inherent mechanical structure of the crane. The installation process is complicated, and the mechanical wear of the elastic body will lead to a decrease in accuracy; The method of working current: it judges whether the crane is overloaded by pre-calibrating the current value under the condition of rated load and comparing the actual current value with the calibrated current value. There are many factors, the actual working current cannot accurately reflect the load mass, resulting in unscientific measurement principles, low accuracy of load mass measurement, safety hazards caused by excessive response time, and cumbersome installation caused by standard weight calibration. And other issues

In summary, the existing load mass measurement methods have problems such as low measurement accuracy, slow response speed, complicated installation and use, and narrow application range.

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