Overload protective system and method of excavator working devices and excavator

Abstract

The invention discloses an overload protective system and method of excavator working devices and an excavator, relating to the technical field of interference prevention of large machines. The system comprises a controller, a plurality of stress sensors, an engine rotating speed control device and an alarm device, wherein the controller is sequentially connected with the stress sensors; the controller is respectively connected with the engine rotating speed control device and the alarm device; and the aim of automatic adjustment for overload protection of the excavator working devices is achieved through comparing stresses allowed by all working devices with the actual stress values tau of all the working devices in working to judge whether the working devices overload, and then, cutting off pilot pressure, outputting alarm information, reducing engine rotating speed P to an idle speed state and the like on each working direction based on the judgment result. By using the overload protective system and method of the excavator working devices, the service life of each working device is prolonged, and therefore, the service life of the excavator is prolonged, the work efficiency of the excavator is increased, and the requirement for operating skills is lowered to a certain extent.

Description

technical field [0001] The invention relates to large-scale machinery anti-interference technology, in particular to an excavator working device overload protection system and method and an excavator. Background technique [0002] At present, the competition in the construction machinery industry is becoming increasingly fierce, and excavators are gradually realizing digital and intelligent control. At the same time, the quality requirements for excavators are also getting higher and higher. However, with the continuous progress and development of society, the working environment faced by excavators is becoming increasingly harsh and complex. With the increasingly tense and scarce energy sources, higher requirements are placed on the fuel consumption of excavators. In order to meet the needs of social development and market competition, excavators are developing in the direction of intelligence, heavy load, and multi-working conditions, which puts forward higher requirements...

AI Technical Summary

Problems solved by technology

However, such requirements are too high for the operator, and judgments based on experience alone will vary from person to person, and cannot effectively protect the excavator.

[0004] When the excavator is overloaded, it may cause the most intuitive adverse phenomena or failures to the excavator as follows: the boom, stick, bucket, etc. are broken or deformed; In the state of useless work, the fuel is wasted in vain; the sealing ring of the key hydraulic parts is worn or broken due to excessive load, resulting in internal leakage and other failures; the unfavorable indirect damage caused by the excavator in the overload working state is: life expectancy is reduced , increase the replacement rate of spare parts, reduce quality, etc.

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