A hydraulic control system, a boom mechanism and a crane with double-cylinder sequential expansion and contraction
A sequential telescopic and telescopic control technology, which is applied in the field of hydraulic control systems, boom mechanisms and cranes, can solve the problems of assembly error and protruding first, and achieve the effects of small pressure loss, easy layout and high reliability
Active Publication Date: 2017-04-12
XCMG XUZHOU TRUCK MOUNTED CRANE
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Problems solved by technology
Due to manufacturing and assembly errors, when the telescopic arm is horizontal and unloaded, the pressure generated by the load of the telescopic mechanism driven by the first telescopic hydraulic cylinder may be greater than or equal to that generated by the load of the telescopic mechanism driven by the second telescopic hydraulic cylinder pressure, resulting in the simultaneous expansion and contraction of the two cylinders or the problem that the second telescopic hydraulic cylinder extends first
Method used
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[0034] The present invention will be further described below in conjunction with accompanying drawing.
[0035] like figure 1 As shown, the hydraulic control system of the double-cylinder sequential expansion and contraction includes a telescopic control unit 1 capable of switching the direction of pressure oil, a balance valve 2, a first telescopic oil cylinder 3, a second telescopic oil cylinder 4 and a one-way valve group 5;
[0036] The telescopic control unit 1 includes a telescopic control unit check valve 11 and a reversing valve 12. The reversing valve 12 includes a pressure oil port P, an oil return port T, a first working oil port A, a second working oil port B and a neutral return port. The pressure oil port P of the reversing valve 12 is connected with the oil inlet pipeline. The port P is connected, and the oil return port T of the reversing valve 12 is connected with the fuel tank;
[0037] The reversing valve 12 has a first working position, a second working pos...
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The invention relates to a hydraulic control system with two sequentially stretched and contracted cylinders. The hydraulic control system is characterized in that a telescopic control link, a balance valve, a first telescopic oil cylinder and a second telescopic oil cylinder are sequentially communicated through an oil path; a one-way valve group is arranged at the bottom of the first telescopic oil cylinder and is communicated with the first telescopic oil cylinder and the second telescopic oil cylinder through the oil path. A suspension arm mechanism comprises a fixed arm, at least two telescopic arms and the hydraulic control system with the two sequentially stretched and contracted cylinders above. A straight arm lorry-mounted crane comprises the suspension arm mechanism above. The hydraulic control system has the beneficial effects that the operation is easy, the suspension arm mechanism can be controlled to stretch and contract at very high variable load especially a no-load condition, and the stretching and contraction processes are safe and reliable. The hydraulic control system is applicable to the sequential stretching and contraction of the suspension arm mechanism in the straight arm lorry-mounted crane at a dual-cylinder control state and particularly applicable to the sequential and loaded stretching and contraction of a suspension arm at the conditions of no-load in place and loaded operation.
Description
technical field [0001] The invention relates to a hydraulic control system, a boom mechanism and a crane with double-cylinder sequential expansion and contraction, and belongs to the technical field of truck-mounted cranes. Background technique [0002] At present, the telescopic boom of the straight-arm truck-mounted crane is mostly synchronous. The method is that a telescopic hydraulic cylinder drags the corresponding number of rope rows according to the total number of telescopic booms, and then drives the telescopic booms of each section to telescopic and telescopic synchronously. However, when the boom drags a certain load and the number of telescopic boom sections is more than 3, the deformation of the boom frame and the excessive load of the single rope may easily cause the wire rope to break, posing safety problems. [0003] With the development of the market and technology, it has become a development trend to complete the boom telescopic technology with two cylinde...
Claims
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IPC IPC(8): B66C13/20B66C23/687F15B11/16
CPCB66C13/20B66C23/705F15B11/20
Inventor 陈志伟满军陈磊程磊余旋满珍商晓恒
Owner XCMG XUZHOU TRUCK MOUNTED CRANE