A hydraulic control system for double luffing cylinders

A technology of hydraulic control system and luffing oil cylinder, which is applied in the directions of load hanging components, cranes, transportation and packaging, etc., can solve problems such as boom jitter, and achieve the effect of avoiding jitter.

Active Publication Date: 2018-08-07
WUHAN MARINE MACHINERY PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of shaking phenomenon in the process of lowering the boom in the prior art, the embodiment of the present invention provides a hydraulic control system with double luffing cylinders

Method used

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  • A hydraulic control system for double luffing cylinders
  • A hydraulic control system for double luffing cylinders
  • A hydraulic control system for double luffing cylinders

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Embodiment

[0025] An embodiment of the present invention provides a hydraulic control system for double luffing cylinders, which is suitable for controlling double luffing cylinders. In this embodiment, the double luffing cylinders include a first luffing cylinder 2 and a second luffing cylinder 1 . figure 1 The schematic diagram of the hydraulic control system of the double luffing cylinder provided by the embodiment of the present invention. like figure 1 As shown, the double luffing cylinder hydraulic control system includes: three-position four-way reversing valve 3 , two-position three-way reversing valve 4 , cartridge valve 5 and synchronous control device 7 .

[0026] The A port of the three-position four-way reversing valve 3 is connected with the first working oil port of the cartridge valve 5, the control oil port of the cartridge valve 5 is connected with the A port of the two-position three-way reversing valve 4, and the two-position three-way Port B of the reversing valve 4...

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PUM

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Abstract

The invention discloses a double-derricking cylinder hydraulic control system. The double-derricking cylinder hydraulic control system further comprises a two-position three-way reversing valve, a cartridge valve and a synchronous control device; a port A of a three-position four-way reversing valve communicates with a first working oil port of the cartridge valve; a control oil port of the cartridge valve communicates with a port A of the two-position three-way reversing valve; a port B of the two-position three-way reversing valve communicates with a second working oil port of the cartridge valve; the second working oil port of the cartridge valve communicates with a first oil port of the synchronous control device; a second oil port of the synchronous control device communicates with rodless cavities of a first derricking cylinder and a second derricking cylinder; and rod cavities of the first derricking cylinder and the second derricking cylinder communicate with a port B of the three-position four-way reversing valve. The double-derricking cylinder hydraulic control system realizes the locking function through the two-position three-way reversing valve and the cartridge valve, and prevents shaking of a lifting arm.

Description

technical field [0001] The invention relates to the field of cranes, in particular to a hydraulic control system for double luffing oil cylinders. Background technique [0002] The jib of the crane changes the pitch angle of the jib through the expansion and contraction of the luffing cylinder to complete the lifting or lowering of the jib during the work process. The boom of large cranes generally adopts double luffing cylinders, that is, two luffing cylinders are used to expand and contract at the same time to realize the luffing movement of the boom. This requires the two luffing cylinders to maintain good synchronization during work. [0003] For double-luffing cylinders, three-position four-way reversing valves, balance valves, and diverter valves are generally used to control the double-luffing cylinders. Among them, the A port of the three-position four-way reversing valve is connected with the oil inlet port of the balance valve, the oil outlet port of the balance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C13/20
CPCB66C13/20B66C2700/03
Inventor 程源张玲珑李占勇叶建
Owner WUHAN MARINE MACHINERY PLANT
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