Load spectrum testing method for hydraulic excavator working device

Abstract

The invention discloses a load spectrum testing method for a hydraulic excavator working device. The load spectrum testing method comprises the following steps of (a) respectively arranging strain foils on piston rods of a movable arm hydraulic cylinder and a scraper pan hydraulic cylinder; (b) locking the movable arm hydraulic cylinder and a scraper pan rod hydraulic cylinder, only enabling the piston rod of the scraper pan hydraulic cylinder to flex so as to push a scraper pan to execute an excavation operation, and respectively testing strain-time response data of the piston rods of the movable arm hydraulic cylinder and the scraper pan hydraulic cylinder in the respective rod length directions under the conditions; and (c) obtaining a stress response spectrum of excavator scraper pan teeth and taking the stress response spectrum as the load spectrum of the working device by utilizing the tested strain-time response data. The invention further discloses a stress response spectrum simplification operation formula constructed based on stress analysis; according to the load spectrum testing method for the hydraulic excavator working device, which is disclosed by the invention, the load spectrum test process of the excavator working device can be realized by a simple, quick and easy-to-operate manner, the tested load spectrum can be applied to the life evaluation, and the effective evidence can be provided for the structure optimization design of hydraulic excavator working device.

Description

technical field [0001] The invention belongs to the technical field of excavation, and more specifically relates to a load spectrum testing method of a working device of a hydraulic excavator. Background technique [0002] An excavator is an earth-moving machine that uses a bucket to excavate materials above or below the bearing surface, and loads them into transport vehicles or unloads them to the stockyard. The structure of a conventional hydraulic excavator mainly includes a power unit, a working device, a slewing mechanism, a control mechanism, a transmission mechanism, a walking mechanism and other auxiliary equipment. Such as figure 1 As shown in , the working device is the key structure that directly executes the excavation task. It is composed of boom 2, arm 10 and bucket 5, which are hinged with each other, and various actions are realized through their respective reciprocating double-acting hydraulic cylinders. control: the boom 2 is driven by the boom hydraulic ...

AI Technical Summary

Problems solved by technology

However, the operation process of this method is complicated and the implementation period is long; and when the structural optimization design of the working device of the excavator is carried out, the structural shape of the working device changes, and the stress spectrum cannot be applied to the force analysis

In addition, Teng Yimin put forward the idea of ​​drawing up the load spectrum by measuring the strain-time response data of each cylinder of the working device in "The Load Spectrum Test Research of the Excavator Working Device" (Master's Thesis of Zhejiang University, National Master's and Doctoral Thesis Database), however The specific force formula and detailed and complete test method for bucket teeth are not provided, so there are problems of poor adaptability and difficult operation in practical operation

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