Multi-way valve, engineering machine and walking control method

Abstract

The invention relates to the field of engineering machines, and particularly relates to a multi-way valve, an engineering machine and a walking control method. The multi-way valve is used for the engineering machine. A walking pilot valve of the engineering machine is provided with a left front oil inlet, a left rear oil retreating port, a right front oil inlet and a right rear oil retreating port. The multi-way valve comprises a walking auxiliary joint, a left walking joint, a right walking joint and a detection mechanism; the left front oil inlet and the left rear oil retreating port communicate with the left walking joint through corresponding pilot oil ways correspondingly; the right front oil inlet and the right rear oil retreating port communicate with the right walking joint throughcorresponding pilot oil ways correspondingly; the left front pilot oil way, the left rear pilot oil way, the right front pilot oil way and the right rear pilot oil way are connected with the walkingauxiliary joint through the detection mechanism; and the detection mechanism is used for obtaining left pilot pressure and right pilot pressure and controlling the walking auxiliary joint to communicate with the left walking joint and the right walking joint when the left pilot pressure and the right pilot pressure are the same. By means of the multi-way valve and the walking control method, the engineering machine can reliably walk linearly.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a multi-way valve, construction machinery and a travel control method. Background technique [0002] Construction machinery, such as: excavators, rotary drilling rigs, etc., all have the ability to walk and move, and construction machinery usually uses multi-way valves to control their walking; multi-way valves include left travel and right travel, left travel and right travel The joints respectively provide the flow required by the left travel motor and the right travel motor, and then use the left travel motor and the right travel motor to control the walking of the construction machinery. [0003] However, the manufacturing accuracy of the left and right travel joints of the multi-way valve provided in the related art will lead to differences in the output oil volumes of the left travel joint and the right travel joint. The increased oil volume difference from the output...

AI Technical Summary

Problems solved by technology

[0003] However, the manufacturing accuracy of the left and right travel joints of the multi-way valve provided in the related art will lead to differences in the output oil volumes of the left travel joint and the right travel joint. The increased oil volume difference from the output of the right travel joint will lead to inconsistent walking speeds on the left and right sides of the construction machinery, resulting in the problem of walking deviation, and then it is impossible to control the construction machinery to go straight reliably

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