Weighing method of electric excavator

Abstract

The invention discloses a weighing method of an electric excavator, which is used for solving the technical problem that a weighting error is extremely high by adopting traditional methods. The technical scheme disclosed by the invention is that the weighing method of the electric excavator comprises the following steps of: establishing a rectangular coordinate system by taking the center of a saddle as a moment balance point and the moment balance point as an original point; determining respective coordinates of respective gravity centers of a shoveling rod, components attached to the shoveling rod and a bucket fill material, a lifting force application point and a pushing force application point in the coordinate system when the shoveling rod is located at a horizontal position, wherein the arm of a pushing force is equal to a vertical coordinate of the pushing force application point; then, working out respective coordinates of the points when weighing is performed according to a shoveling rod kinematic trajectory equation, wherein the gravity center of the arm of gravity is equal to a horizontal coordinate when the weighing is performed; working out a tangent point coordinate according to a positional relation between the lifting force when the weighing is performed and a tangent point between a hoisting cable at the right side of a hoisting sheave and the hoisting sheave, listing an equation of a straight line on which the hoisting cable is located, and working out the arm of the lifting force by using the distance from the center of the saddle to the straight line; working out the lifting force and the pushing force by a pushing motor and a lifting motor according to the relation between the lifting force and the pushing force; and finally, listing a torque equilibrium equation to work out the weight of the material.

Description

technical field [0001] The invention relates to a weighing method of an electric excavator, which is especially suitable for weighing the twist-free round shovel type electric excavator. Background technique [0002] Electric excavators are mainly used for excavating soil, rock, ore and coal in large-scale open-pit mines. According to different pushing methods, they are divided into rack and pinion push electric excavators and twist-free round shovel-bar electric excavators. In the past, in order to count the output of a single excavator, it could only be estimated by special personnel to record the number of loaded vehicles. This not only has many errors in the statistics, but also increases the investment of personnel. [0003] The Chinese patent with the application number 200710185462.5 announced a weighing method for a rack and pinion push type electric excavator. This method calculates the weight of the wire rope against the shovel through the relationship between the ...

AI Technical Summary

Problems solved by technology

[0004] Although the technical solution of this patent saves manpower, the calculation method ignores the influence of the gravity of the shovel rod and other parts attached to the shovel rod, so the material weight calculated according to this technical solution will have a relatively large error, and the patent The technical solution is not suitable for the electric shovel pushed by the wire rope

[0005] Then the included angle between the boom and the push arm and the angle between the boom and the hoisting wire rope on the right side of the sky wheel in this patent scheme are calculated by the law of cosines, due to the extension line of the boom and the sky wheel The extension line of the hoisting wire rope on the right side of the wheel does not intersect at the tangent point between the hoisting wire rope and the right side of the sky wheel. Since the tangency point changes relative to the sky wheel, the boom will not change, and the padlock will be deformed relative to the shovel rod. The resulting closed figure is not a real triangle, so using the law of cosines will cause errors

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