Novel method for testing durability of track tensioning device of hydraulic excavator

Abstract

The invention discloses a novel method for testing the durability of a track tensioning device of a hydraulic excavator. The method comprises the following steps of: calculating a maximum working pressure of an oil cylinder during working according to a maximum load of the track tensioning device of the hydraulic excavator and the diameter of the oil cylinder, taking the maximum working pressure as a maximum hydraulic value provided by a hydraulic pump unit, and connecting the track tensioning device and the hydraulic pump unit with an operating system through an oil supply pipeline; removing grease inside the oil cylinder of the track tensioning device, and realizing periodic compression of a tensioning spring by using periodic reciprocating motions of a piston and the oil cylinder of the track tensioning device; recording a spring compressed frequency before the track tensioning device fails so as to determine the durability of the track tensioning device; and detecting and analyzing a failure mode so as to provide basis for improvement on the durability of the track tensioning device. By using the oil cylinder of the track tensioning device, the reciprocating motion of the tensioning spring is realized, and an auxiliary hydraulic cylinder is avoided; therefore, the whole test equipment is simplified, and the safety protection level is high.

Description

technical field [0001] The invention relates to a test method for a crawler belt tensioning device, in particular to a durability test method for a new hydraulic excavator crawler belt tensioning device. Background technique [0002] Generally speaking, after the hydraulic excavator has been used for a period of time, due to the wear of the rail chain pin sleeve, the pitch will increase, which will easily cause the track to derail and rub the track frame, thereby affecting the walking performance of the excavator. A tensioning device is installed in the traveling device to keep the crawler belt at a certain degree of tension. The track tensioning device is an important part of the tracked traveling mechanism, and its performance has a great influence on the driving performance of the tracked vehicle. Crawler-type hydraulic excavators often work in sites with harsh environmental conditions, so the track tensioning device is required to have the following performance: when th...

AI Technical Summary

Problems solved by technology

The durability test of the excavator tensioning device currently seen is to use the hydraulic pump station to periodically apply an alternating load to the tensioning device spring through an external hydraulic cylinder, that is, to periodically compress the tensioning spring for its durability. This durability test is essentially a test of the fatigue resistance of the spring and the durability of the piston and cylinder under constant pressure, and cannot reflect the durability of the piston and cylinder in relative motion.

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