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Hydraulic circuit and method for controlling compound actions of excavator movable arm

A compound action, control excavation technology, applied in mechanically driven excavators/dredgers, etc., can solve the problem of increasing the pressure of the oil circuit 13, insufficient flow of the hydraulic motor 1, and poor operability of the boom lifting and rotating compound actions, etc. problems, to achieve the effect of reducing pressure loss and saving energy

Active Publication Date: 2012-12-05
SUNWARD INTELLIGENT EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Since the hydraulic pressure of the hydraulic boom cylinder 2 and the hydraulic motor 1 changes in stages when the boom cylinder 2 and the hydraulic motor 1 act simultaneously, if the flow priority valve 20 is always Keeping it in the left position, the flow priority valve 20 keeps throttling the oil passage 13, which will cause insufficient flow of the hydraulic motor 1 and increase the pressure loss of the oil passage 13 during the whole boom lifting and swing compound action , resulting in a large energy loss, resulting in poor maneuverability, poor controllability and coordination of the boom lifting and turning compound actions

Method used

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  • Hydraulic circuit and method for controlling compound actions of excavator movable arm
  • Hydraulic circuit and method for controlling compound actions of excavator movable arm
  • Hydraulic circuit and method for controlling compound actions of excavator movable arm

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Embodiment 1

[0038] Now refer to figure 2The preferred embodiment 1 of the hydraulic circuit for controlling the compound action of the excavator arm of the present invention will be described in detail.

[0039] figure 2 It is a schematic diagram of the first embodiment of the hydraulic circuit for controlling the compound action of the excavator arm in the present invention, as figure 2 As shown, the hydraulic circuit of the present invention has a first hydraulic pump P1 and a second hydraulic pump P2, each of which generates hydraulic oil to supply the hydraulic circuit, and the first hydraulic pump P1 generates hydraulic oil through the oil circuit 12, and is divided by the oil circuit 12 Supply to the oil circuit 13 and the oil circuit 14, the oil circuit 13 supplies oil to the hydraulic motor 1, and the oil circuit 17 and the oil circuit 14 jointly supply oil to the boom cylinder 2. A motor flow valve 3 is provided at the oil circuit 13. The motor flow valve 3 restricts the flo...

Embodiment 2

[0047] image 3 It is a schematic diagram of the second embodiment of the hydraulic circuit for controlling the compound action of the excavator arm in the present invention, as image 3 As shown, the hydraulic circuit of the present invention has a first hydraulic pump P1 and a second hydraulic pump P2, each of which generates hydraulic oil to supply the hydraulic circuit, and the first hydraulic pump P1 generates hydraulic oil through the oil circuit 12, and is divided by the oil circuit 12 The oil passage 13 and the oil passage 14 supply oil to the hydraulic motor 1 , and the oil passage 17 and the oil passage 14 jointly supply oil to the boom cylinder 2 . An automatic priority valve 8 is arranged at the oil circuit 12, and the automatic priority valve 8 can work at three positions, and the oil in the oil circuit 12 is divided into the oil circuit 13 and the oil circuit 14 in the valve, and the left position is for the oil Road 13 restricts the flow, giving priority to oil...

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Abstract

The invention discloses a hydraulic circuit and a method for controlling compound actions of an excavator movable arm. The hydraulic circuit comprises a hydraulic pump, a master control valve and an auxiliary control valve of a hydraulic actuator, and a motor flow valve and a movable arm flow valve. The motor flow valve and the movable arm flow valve are used to distribute flow. The movable arm flow valve is disposed between a first hydraulic pump and a hydraulic oil circuit of the auxiliary movable arm control valve. The movable arm flow valve is controlled by control signals from two ends, and the control signals from the two ends are generated by the oil circuit from the movable arm flow valve to the auxiliary movable arm control valve and the pressure difference between the motor flow valve and a rotation control valve oil circuit. The motor flow valve is disposed between the first hydraulic pump and the hydraulic oil circuit of a rotation control valve and controlled by control signals from two ends, and the control signals from the two ends are generated by the oil circuit from the movable arm flow valve to the auxiliary movable arm control valve and the pressure difference between the motor flow valve and the rotation control valve oil circuit. The two valves adjust distribution proportion of the flow from the first hydraulic pump to the hydraulic motor and the movable arm cylinder in real time according to the control pressure of the two ends, and the requirements for coordinative control and energy conservation of compound actions of the movable arm, namely lifting and rotating, are met.

Description

technical field [0001] The present invention relates to a variable pump control circuit, in particular to a hydraulic circuit for controlling compound movements of excavator arms, and also relates to a control method for the hydraulic circuit for controlling compound movements of excavator arms. Background technique [0002] The loading condition is the most common working condition of the excavator. During the loading process of the excavator, the lifting and turning of the boom are part of the loading cycle. Since the boom cylinder is supplied by double pumps in the medium-sized excavator, that is, There is a pump that supplies oil to the boom cylinder and the hydraulic motor at the same time, so that the flow distribution of the two hydraulic actuators is often unreasonable, resulting in the movement of the boom cylinder and the hydraulic motor often appearing in the boom lifting and swinging process. Coordination, the inconsistency between the boom cylinder and the hydra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F3/42E02F3/43
Inventor 陈艳军郭勇陶海军刘均益张新海郝鹏
Owner SUNWARD INTELLIGENT EQUIP CO LTD