Electric excavator weighing method

Abstract

The invention discloses an electric excavator weighing method for solving the technical problem of overlarge weighing error of the existing method. According to the technical scheme of the invention, the electric excavator weighing method comprises the following steps of: establishing a rectangular coordinate system by taking the center of a saddle as a moment balance point and taking the moment balance point as an original point; determining coordinates of the centers of gravities of a shovel lever, a part attached to the shovel lever and a bucket full of materials as well as action points of a lifting force and a pushing force in the coordinate system when the shovel lever is in a horizontal position, and then, solving the coordinates of the points during weighing according to a shovel lever movement locus equation, wherein the moment arm of the pushing force is equal to the vertical coordinate of the action point of the pushing force, and the moment arm of the gravity is equal to the horizontal coordinate of the center of gravity in weighing; solving the coordinate of a tangency point according to the position relationship between the action point of the lifting force as well as a hoisting rope at the right of the head sheave and the tangency point of the head sheave during weighing, listing an equation of a straight line where the hoisting rope is, and solving the moment arm of the lifting force by utilizing the distance from the center of the saddle to the straight line; measuring the pushing force and the lifting force by using a sensor; and finally, listing a torque equilibrium equation and solving the weight of the materials.

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 ...

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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] In addition, in this technical solution, the lifting force of the wire rope on the bucket and the thrust of the pushing arm on the bucket are respectively calculated through the relationship between these two forces and the lifting torque and pushing torque. The transmission efficiency between the motor and the output of the working mechanism is often changed, but they all take a fixed value in the calculation, so the lifting force of the steel wire rope on the bucket and the force of the pushing arm on the bucket are calculated in this way. Thrust error is relatively large

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