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Hydraulic control system

A technology of hydraulic control system and control valve, applied in the direction of fluid pressure actuation device, earth mover/shovel, servo motor, etc. The effect of high fuel consumption, high utilization rate and improving the efficiency of operating machinery

Pending Publication Date: 2019-12-06
JIANGSU HENGLI HYDRAULIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem in the hydraulic control system in the prior art that during the lowering process of the working device, the negative pressure cavity of the actuator is easy to suck empty, such as the regenerated hydraulic oil released from the actuator enters the negative pressure cavity body, it is necessary to limit the regeneration flow rate of the regenerative hydraulic oil, resulting in the problems of low regeneration flow rate and low utilization rate. The present invention proposes a hydraulic control system to solve the above technical problems

Method used

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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, this embodiment provides a hydraulic control system for driving a working device to work. The hydraulic control system includes at least one hydraulic pump and an actuator 2. At least one hydraulic pump discharges working oil, and the actuator 2 works by being supplied with working oil from the above-mentioned at least one hydraulic pump. The actuator 2 can be a hydraulic cylinder, which has two chambers, namely a rod chamber 21 and a rodless chamber 22 .

[0039] There are two hydraulic pumps, namely hydraulic pump IP1 and hydraulic pump IIP2. Under the control of control valve I3, hydraulic pump IP1 can supply oil to the two cavities of actuator 2 respectively. During the lifting process of the working device, hydraulic pump IIP2 It can be combined with the hydraulic pump IP1 to supply oil to the actuator 2. In this embodiment, the hydraulic pump IIP2 can flow together with the hydraulic pump IP1 to supply oil to the rodless chamber 22 of ...

Embodiment 2

[0056] Such as figure 2 As shown, this embodiment is basically the same as Embodiment 1, the only difference is that the hydraulic control system of this embodiment does not need to set the control valve II111, and the oil supply of the hydraulic pump IP1 can be controlled by the control valve I3. Specifically, When the control valve I3 is in the neutral position, the hydraulic pump IP1 stops supplying oil to the actuator 2, and when the control valve I3 is in the left and right positions, it supplies oil to the two cavities of the actuator 2 respectively.

[0057] In this embodiment, when the working device is descending, the oil drained from the rodless chamber 22 of the actuator 2 can be partially regenerated through the regeneration oil circuit 7, and part of the oil can be returned through the oil return circuit 8. In this embodiment, only through The oil return circuit 8 is used to adjust the descending speed of the working device.

[0058] The control valve I3 in this...

Embodiment 3

[0060] Such as image 3 As shown, this embodiment is basically the same as the first embodiment, the only difference is that the rod chamber 21 and the rodless chamber 22 of the actuator 2 are set in opposite directions. The working oil port a communicates with the rodless chamber 22 , and the working oil port b communicates with the rod chamber 21 through the working oil passage 5 . When the working device is lifted, the hydraulic pump IP1 and the hydraulic pump IIP2 can merge to supply oil to the rod chamber 21 of the actuator 2, and the merged hydraulic oil passes through the control valve III61 and / or the first one-way valve 62 to supply the actuator 2 When the working device is lowered, the working oil discharged from the rod chamber 21 of the actuator 2 flows out through the control valve III61, and is regenerated through the regeneration oil circuit 7 and / or through the oil return circuit 8 The oil is returned to the oil return tank T and / or the oil is returned to the ...

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Abstract

The invention relates to a hydraulic system of operating machinery, in particular to a hydraulic control system. The hydraulic control system comprises at least one hydraulic pump, an actuator and anoil replenishing oil way, wherein the hydraulic pump is used for spraying working oil; the actuator works by virtue of the working oil coming from the hydraulic pump and is used for driving a workingdevice to move; the oil replenishing oil channel is provided with an opening and closing valve; and in a descending process of the working device, hydraulic oil inside an oil return tank is replenished into a negative-pressure chamber body of the actuator via the oil replenishing oil channel. The hydraulic control system provided by the invention solves the problems that in the descending processof the working device of the hydraulic control system of the prior art, the negative-pressure chamber body of the actuator can be easily emptied in a suction way, the regenerative flow rate of regenerative hydraulic oil should be limited if the regenerative hydraulic oil leaking out of the actuator enters the negative-pressure chamber body, and the regenerative flow rate is low and the utilizationrate is low.

Description

technical field [0001] The invention relates to a working machine hydraulic system, in particular to a hydraulic control system. Background technique [0002] Among the current construction machinery, the use of excavators has been greatly promoted and applied, and its fuel consumption, work efficiency and ease of operation are the main concerns of various main engine manufacturing companies, R&D institutions and customers. During the operation of the excavator, the frequent movement of the boom, coupled with the inertial movement generated by its own weight, leads to the loss of hydraulic energy, and at the same time increases the oil temperature of the hydraulic system, thereby reducing the life of the hydraulic components and improving the working efficiency of the machine. The fuel consumption rate is lower, which further reduces the convenience of the whole machine operation. In order to overcome the hydraulic energy loss caused by the inertial motion generated by the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/08F15B13/04E02F9/20E02F9/22
CPCF15B11/08F15B13/0401E02F9/20E02F9/22E02F9/2267E02F9/2232E02F9/2292F15B2211/20576F15B2211/405
Inventor 汪立平贾靖黄国和刘红光哈良韩俊翔翟莉
Owner JIANGSU HENGLI HYDRAULIC TECH CO LTD
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