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Hydraulic system, control method and wheel excavator

A hydraulic system and hydraulic technology, applied in the field of wheeled excavators, can solve problems such as incompatibility with large flow control and small flow fine control

Pending Publication Date: 2022-07-29
LIUZHOU LIUGONG EXCAVATORS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a hydraulic system, a control method and a wheeled excavator for the problem that it is difficult to be compatible with large flow control and small flow fine control in the existing hydraulic system. Action control and small flow fine control requirements

Method used

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  • Hydraulic system, control method and wheel excavator
  • Hydraulic system, control method and wheel excavator
  • Hydraulic system, control method and wheel excavator

Examples

Experimental program
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Embodiment 1

[0029] like figure 1 figure 2 As shown, the hydraulic system in this embodiment includes a hydraulic actuator 40, a pressure oil source, an electric proportional valve, a controller 7 for controlling the electric proportional valve, and a manipulation device 8 connected to the controller 7 for controlling the hydraulic actuator , opening and closing solenoid valve 60 and so on.

[0030] The pressure oil source consists of a hydraulic oil tank 10, a hydraulic pump 21 connected to the oil suction port and the hydraulic oil tank, and a power drive device 23 that drives the hydraulic pump 21 to rotate. The power drive device 23 is an electric motor or a fuel engine, and the speed of the power drive device 23 can be controlled by controlling The rotational speed of the hydraulic pump 21 is controlled to adjust the flow rate of the hydraulic pump 21 within a certain range.

[0031]The electro-proportional valve 3 consists of a hydraulically controlled main valve 31 and an electro...

Embodiment 2

[0049] image 3 A part of the oil circuit in the hydraulic system of a wheeled excavator is shown. The hydraulic system in the traveling part of the wheeled excavator is the hydraulic system in the first embodiment, that is, the hydraulic actuator 40 in the first embodiment is the traveling motor of the excavator, and the hydraulic pump 21 and the second hydraulic pump 22 constitute a double pump The oil supply assembly 20, the main hydraulic control valve 31 is the main valve of the traveling wheel, and it is connected with the main valve of the rotary joint 32, the main valve of the arm joint 33, the main valve of the boom joint 36, the main valve of the bucket joint 35, the main valve of the bulldozer joint The main valve 34 constitutes the main control valve assembly 30 , wherein the hydraulic control main valve 31 and the main valve 32 of the rotary joint and the main valve of the stick joint 33 are supplied with oil by the hydraulic pump 21 ; the main valve of the boom j...

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Abstract

The invention relates to a hydraulic system, and aims to solve the problem that an existing hydraulic system is difficult to be compatible with large-flow control and small-flow fine control. The invention provides a hydraulic system, a control method and a wheel excavator. An oil inlet and a first working oil port of an electric proportional valve in the hydraulic system are correspondingly connected with a pressure oil source and a first oil port of a hydraulic execution part; an oil inlet and an oil outlet of the opening and closing electromagnet are correspondingly communicated with an oil inlet and a first working oil port of the electric proportional valve, and the controller outputs an electric proportional valve control current used for controlling the opening degree of a valve port from the oil inlet of the electric proportional valve to the first working oil port according to a control signal of the control device; and when the control signal is smaller than or equal to the valve port full-opening minimum signal value, the controller controls the opening and closing electromagnetic valve to be in a cut-off state, and otherwise, the controller controls the opening and closing electromagnetic valve to be in a conducting state. According to the invention, fine operation control of small flow and high-speed action operation control of large flow can be well compatible.

Description

technical field [0001] The present invention relates to a hydraulic system, and more particularly, to a hydraulic system, a control method and a wheeled excavator. Background technique [0002] In the field of construction machinery, hydraulic actuators such as oil cylinders and motors are used to drive related components to realize the actions of related components of construction machinery. The hydraulic system that drives and controls the hydraulic actuator includes the hydraulic actuator, a control valve for controlling the hydraulic actuator, and a pressure oil source that provides pressure oil for the action of the hydraulic actuator. The control valve is connected between the hydraulic actuator and the pressure oil source. The control valve adopts electric control or hydraulic control, and its spool usually moves axially to open or close the valve port to realize the control of hydraulic actuators. [0003] When the pressure oil provided by the pressure oil source i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/08F15B13/02E02F9/22
CPCF15B11/08F15B13/02F15B13/025E02F9/2264F15B2013/004
Inventor 玉有恩刘晓强何兵莫家幼
Owner LIUZHOU LIUGONG EXCAVATORS
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