Hydraulic circuit of engineering machinery and method for driving the same

Abstract

The invention provides a hydraulic circuit of engineering machinery and a method for driving the same. The invention discloses a pair of driving motors which utilize the operating oil discharged from the hydraulic pump for rotary driving. The invention also discloses a pair of flow detecting sensors configured to the front end of each driving motor, a flow control valve for controlling the flow of the operating oil provided for the driving motors, and a hydraulic circuit of the control portion for a serial of feedback programs which, combined with the components, compares the operating oil provided to the right and left motors, and selectively controls the flow control valve, thereby adjusting the right and left flow value within the preset relative error range. Further provided is a method for driving the hydraulic circuit. Therefore, the right and left motors are actually rotatably driven by equal flow when the signals are straight driving signals, thereby driving the engineering to go straight, thus to automatically prevent the tilt driving of the engineering machine.

Description

technical field [0001] The present invention relates to a construction machine such as an excavator, and more particularly to a hydraulic circuit of a construction machine including a travel motor rotationally driven by working oil. Background technique [0002] A construction machine such as an excavator travels by driving a travel motor that is rotationally driven by working oil. Usually, after a pair of left and right travel motors consisting of a left travel motor and a right travel motor are provided, the travel direction is changed from one pair to the other. The flow rate of the working oil supplied to the motor is determined. For example, the excavator travels straight when the flow rates of hydraulic oil supplied to the pair of left and right travel motors are the same. [0003] figure 1 It is an example of a hydraulic circuit of a conventional construction machine, and is a hydraulic circuit diagram schematically shown centering on the part related to travel. ...

AI Technical Summary

Problems solved by technology

[0007] However, due to processing errors, assembly errors, or processing errors in each flow path of the travel spool valve as an important component constituting each travel control valve 30a, 30b, even in the case of a straight travel signal, it will be in the left / right direction. There is a difference in the flow rate of the working oil supplied by the right pair of travel motors 40a, 40b, and as a result, there will be a diagonal travel phenomenon in which the construction machine leans to one side

[0008] Such oblique driving phenomenon not only makes it difficult to control the driving of construction machinery, but also becomes the main cause of major accidents in narrow roads or inclined areas.

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