Hydraulic circuit of construction machinery and its driving method
A technology of hydraulic circuits and construction machinery, applied in the field of hydraulic circuits, can solve the problems of processing errors, differences, and processing errors of driving slide valves.
Active Publication Date: 2018-07-10
DOOSAN INFRACORE CO LTD
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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.
Method used
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Embodiment Construction
[0024] The preferred embodiments of the present invention are described below with reference to the drawings.
[0025] figure 2 This is a hydraulic circuit diagram illustrating a hydraulic circuit according to an embodiment of the present invention, and this diagram only illustrates a part of a part of a construction machine such as an excavator that is particularly related to driving. figure 2 Circuits related to work pieces that are not related to traveling (for example, boom, arm, bucket, etc.) are omitted in this section.
[0026] according to figure 2 The hydraulic circuit 100 of a construction machine includes a hydraulic pump 120 and a pair of left / right travel control valves 130a, 130b that supply working oil discharged from the hydraulic pump 120 to a pair of left / right travel motors 140a, 140b, respectively. For example, the left travel control valve 130a can supply the left travel motor 140a with hydraulic oil discharged from the hydraulic pump 120 at a predetermined f...
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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 equipped with a travel motor that is rotationally driven by hydraulic fluid. Background technique [0002] Construction machinery such as excavators drives a travel motor that is rotated by working oil to achieve travel. Usually, it is equipped with a pair of left and right travel motors composed of a left travel motor and a right travel motor, and the travel direction is changed to these pairs. The flow rate of the working oil supplied by the motor is determined. For example, when the flow rate of the hydraulic oil supplied to the pair of left and right travel motors is the same, the excavator travels straight. [0003] figure 1 It is an example of a hydraulic circuit of a conventional construction machine, and is a hydraulic circuit diagram schematically illustrated mainly on parts related to driving. [0004]...
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IPC IPC(8): F15B11/22
CPCE02F9/2242E02F9/2292F15B13/0403F15B13/0444F16H61/456
Inventor 金东玄
Owner DOOSAN INFRACORE CO LTD