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Excavator arm hydraulic system and control method thereof

A technology of a hydraulic system and a control method, which is applied to earth movers/excavators, construction, etc., can solve problems such as increased operation and maintenance costs, abnormal noise, and burnt seals, so as to reduce post-operation and maintenance costs and improve Oil pressure, the effect of avoiding the burn of the seal

Active Publication Date: 2022-03-25
潍柴(青岛)智慧重工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above technical solution has the following disadvantages: due to the existence of the small-diameter hose, there is a large pressure loss when the oil flows, which leads to the failure of the large chamber of the boom cylinder to obtain compensation oil in time when the boom is rapidly lowered, so that the boom The large cavity of the oil cylinder is in a negative pressure state, and the air is separated from the oil, causing burns on the seals, abnormal noise, and cavitation of components, which increases the cost of later operation and maintenance

Method used

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  • Excavator arm hydraulic system and control method thereof
  • Excavator arm hydraulic system and control method thereof
  • Excavator arm hydraulic system and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1, as Figures 1 to 3 As shown, an excavator boom hydraulic system includes a hydraulic oil tank 1, a main pump 2, a boom cylinder 6, and a main valve 3. The main valve 3 includes a first main valve oil inlet P11, a first main valve return Oil port T11, second main valve oil return port T12, second main valve oil inlet port P12, first main valve working oil port A1, second main valve working oil port B1, third main valve working oil port C1, The fourth main valve working oil port D1.

[0031]Specifically, the first main valve oil inlet P11 can be closed or communicated with one of the first main valve working oil port A1 and the second main valve working oil port B1; the first main valve oil return port T11 can be closed or communicated with One of the second main valve working oil port B1 and the first main valve working oil port A1 is connected; the second main valve oil return port T12 can be closed or communicated with the third main valve working oil port ...

Embodiment 2

[0045] Example 2, as figure 2 , 3 As shown in 4, an excavator boom hydraulic system includes a hydraulic oil tank 1, a main pump 2 and a boom cylinder 6, and also includes a main valve 3. The main valve 3 includes a first main valve oil inlet P11, a first main valve Valve oil return port T11, second main valve oil return port T12, second main valve oil inlet port P12, first main valve working oil port A1, second main valve working oil port B1, third main valve working oil port C1, the fourth main valve working oil port D1.

[0046] Specifically, the first main valve oil inlet P11 can be closed or communicated with one of the first main valve working oil port A1 and the second main valve working oil port B1; the first main valve oil return port T11 can be closed or communicated with One of the second main valve working oil port B1 and the first main valve working oil port A1 is connected; the second main valve oil return port T12 can be closed or communicated with the third ...

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Abstract

The invention discloses a hydraulic system of an excavator arm. The excavator arm hydraulic system includes a hydraulic oil tank, a main pump, a boom oil cylinder, and a main valve. The oil inlet of the first main valve can work with the second main valve. The oil ports are connected; the oil return port of the first main valve is connected with the working oil port of the first main valve; the working oil port of the first main valve is connected with the small cavity oil inlet port of the boom cylinder, and the working oil port of the second main It communicates with the oil inlet of the large chamber of the boom oil cylinder, and a reversing valve is connected between the oil inlet of the small chamber and the oil inlet of the large chamber, and the reversing valve can be closed or communicated with the large chamber and the small chamber. A method for controlling the hydraulic system of an excavator arm as described above, including the following steps: S21. The controller starts the main pump, so that the oil inlet port of the first main valve communicates with the working oil port of the second main valve, and the first main valve The oil return port of the valve is connected with the working oil port of the first main valve; S22, the controller activates the reversing valve. Avoid the air from the oil to cause burns to the seals, abnormal noise, cavitation of components, and reduce the later cost.

Description

technical field [0001] The invention relates to an excavator arm hydraulic system and a control method thereof. Background technique [0002] In the prior art, the excavator boom is controlled up and down by a hydraulic system. When the boom needs to be raised, the small cavity of the boom cylinder enters oil, and the large cavity of the boom cylinder discharges oil to realize the boom lift; When descending, oil is discharged from the small cavity of the boom cylinder, and oil is fed into the large cavity of the boom cylinder to realize the boom descending. [0003] The above technical solution has the following disadvantages: due to the existence of the small-diameter hose, a large pressure loss occurs when the oil flows, so that the large cavity of the boom cylinder cannot obtain the compensation oil in time when the boom is rapidly lowered, so that the boom can not obtain compensation oil in time. The large cavity of the oil cylinder is in a negative pressure state, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/20E02F9/22
CPCE02F9/20E02F9/22
Inventor 焦志方王宾王德永蒙小行胡月平张玮陈凯袁玉荣刘虹
Owner 潍柴(青岛)智慧重工有限公司