Free hook-dropping hydraulic system of crane and crane

A hydraulic system and crane technology, applied in the field of crane free-fall hook hydraulic system and cranes, can solve problems such as low efficiency and power priority, and achieve the effect of meeting the needs of multiple working conditions and improving work efficiency and reliability.

Active Publication Date: 2018-03-27
ZHEJIANG SANY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the purposes of the present invention is to provide a crane free-falling hook hydraulic system and a crane to improve the problem that the existing hydraulic control system and the crane cannot directly achieve power priority and low efficiency

Method used

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  • Free hook-dropping hydraulic system of crane and crane
  • Free hook-dropping hydraulic system of crane and crane
  • Free hook-dropping hydraulic system of crane and crane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Example 1, reference Figure 4 As shown,

[0079] A hydraulic system for a crane free fall hook, comprising a pedal pilot valve 1, a pressure reducing valve 2, a first two-position four-way solenoid valve 3, a first two-position four-way hydraulic control reversing valve 4, a handle pilot valve 5, or Gate type shuttle valve 6, two-way reversing valve group 7, disc brake 8, reducer clutch 9, winch 10, overflow valve 11 and servo pump 12.

[0080] Among them, the two-way reversing valve group 7 includes a second two-position four-way solenoid valve 7a and a second two-position four-way hydraulic control reversing valve 7b.

[0081] The oil outlet of the servo pump 1212 is connected with the oil inlet of the relief valve 11, the pressure reducing valve 2 and the first two-position four-way solenoid valve 3.

[0082] The working oil port A of the pressure reducing valve 2 is connected with the pressure oil port P of the pedal pilot valve 1, the handle pilot valve 5 and the second ...

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Abstract

The invention provides a free hook-dropping hydraulic system of a crane and the crane comprising the hydraulic system. The hydraulic system comprises a hydraulic oil delivery pump, a first working oilway unit used for controlling a speed reducer clutch, a second working oil way unit used for controlling a speed reducer brake, and a third working oil way unit used for controlling a hydraulic motorto execute rising and falling actions. The third working oil way unit outputs pilot control signals to interfere in control of the first working oil way unit and the second working oil way unit whilecontrolling the hydraulic motor to execute the rising and falling actions, switching can be rapidly conducted in the free hook dropping mode so that rising and falling of a winch can be achieved, anda series of tedious operations such as working mode switching are not needed. By means of the hydraulic system and the crane, the previous control mode is fundamentally changed, the work efficiency and reliability are effectively improved, and various working condition requirements of multifunctional vehicle types can be met.

Description

Technical field [0001] The invention relates to the technical field of engineering machinery, and in particular to a crane free-falling hook hydraulic system and a crane. Background technique [0002] At present, the free-falling hook hydraulic system is more and more widely used in the lifting equipment of construction machinery, which can greatly shorten the lowering time of the hook and improve the work efficiency. However, the existing hydraulic control systems and cranes cannot directly give priority to power, and need to switch the control system every time, resulting in lower efficiency and lower reliability. Summary of the invention [0003] One of the objectives of the present invention is to provide a crane free fall hook hydraulic system and a crane, so as to improve the existing hydraulic control system and the crane that cannot directly achieve power priority and low efficiency. [0004] In order to solve at least one of the above technical problems, the present invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66C13/20B66C13/16F15B21/08
CPCB66C13/16B66C13/20F15B21/087
Inventor 许月平林异捷许学建
Owner ZHEJIANG SANY EQUIP
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