Crane and its free-fall hook hoisting control system and method
A control system and drop hook technology, applied in the field of free-fall hook hoisting control systems and cranes, can solve problems such as easy misoperation and unreliable braking methods.
Active Publication Date: 2016-02-03
ZOOMLION HEAVY IND CO LTD
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Problems solved by technology
[0005] The present invention provides a crane and its free-falling hook hoisting control system and method to solve the problems in the prior art that the braking mode of the free-falling hook hoisting control system is unreliable and prone to misoperations, resulting in safety accidents
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[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0050] see figure 1 , figure 1 It is a system control schematic diagram of a free-fall hook winch control system according to a preferred embodiment of the present invention.
[0051] Such as figure 1 As shown, the free-fall hook winch control system 100 provided by a preferred embodiment of the present invention mainly includes an oil tank 1, a constant pressure oil source 2, a clutch 3, a pressure proportional valve 4, a first reversing valve 5, and a seco...
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The invention provides a crane and a system and method for controlling free hook-falling and winching of the crane. The system for controlling free hook-falling and winching comprises an oil tank, a constant-pressure oil source, a clutch, a pressure proportional valve, a first reversing valve and a second reversing valve. The clutch comprises a double-action hydraulic cylinder with the equal action area, the double-action hydraulic cylinder with the equal action area comprises a cylinder body, a piston, a first oil port, a second oil port and a piston rod, the cylinder body is divided into a first cavity and a second cavity through the piston, the first oil port and the second oil port correspond to the first oil port and the second oil port respectively and are formed in the two ends of the cylinder body respectively, and the piston rod and the piston are connected. According to the oil pressure of the first cavity and the oil pressure of the second cavity, retraction displacement is generated and the clutch is opened so that free hook falling can be achieved or thrusting displacement can be generated; the clutch is buckled so that a brake can be achieved. According to the crane and the system and method for controlling free hook-falling and winching, safety guarantees are achieved under all work conditions and safety accidents are avoided even though fault operation occurs.
Description
technical field [0001] The invention relates to the technical field of heavy engineering machinery, in particular to a free-fall hook hoisting control system and method, and also to a crane. Background technique [0002] With the accelerated pace of engineering construction, foundation construction methods such as grab buckets and dynamic compaction have been widely used. Since crawler cranes (commonly known as crawler cranes) are often used in working conditions such as grab buckets and dynamic compaction, in order to improve work efficiency and reduce energy consumption, crawler cranes are required to have the function of free-falling hooks. [0003] Therefore, in order to better meet the construction requirements, a safe and reliable free-fall hook control is very necessary. [0004] The existing crawler crane free fall hook winch control system does not have a good braking function, its braking method is unreliable, and it is prone to misoperation and cause safety accid...
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IPC IPC(8): B66D1/44B66D1/08
Inventor 李俊
Owner ZOOMLION HEAVY IND CO LTD