Telescopic protection system and crane
A technology of protection system and telescopic oil cylinder, which is applied to cranes and other directions, can solve problems such as reducing the stability of telescopic booms and potential safety hazards of cranes, and achieve the effect of improving controllability and stabilizing cut-off protection
Active Publication Date: 2015-06-10
SANY AUTOMOBILE HOISTING MACHINERY
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Problems solved by technology
[0006] When the telescopic oil cylinder with the above structure is adopted, during the working process, if it is necessary to control the action of the cylinder pin or the arm pin, the second oil chamber 326 and the core tube 34 will be filled with pressure oil, and the pressure oil will generate pressure on both ends of the core tube 34. The hydraulic force separated from each other makes the cylinder 31 and piston rod 32 of the telescopic cylinder move relative to each other (passive extension movement), which reduces the stability of the telescopic arm and poses a safety hazard to the crane
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[0035] It should be pointed out that the description and sequence of specific structures in this section are only illustrations of specific embodiments, and should not be considered as limiting the protection scope of the present invention. In addition, the embodiments in this section and the features in the embodiments can be combined with each other under the condition of no conflict.
[0036] Please also refer to figure 1 and figure 2 , the present invention will be described in detail below in conjunction with embodiment.
[0037] combine figure 2 As shown, the telescopic protection system of this embodiment at least includes a main valve 1, a telescopic cylinder 3, a cylinder pin cylinder 4, an arm pin cylinder 5, a ball valve 6, a cartridge valve 71, a damper 72, a reversing valve 73 and a safety valve 74.
[0038] Among them, the first working oil port A of the main valve 1 is connected to the third oil port 323 of the telescopic oil cylinder 3, the second working ...
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The invention relates to the technical field of telescopic protection, and discloses a telescopic protection system and a crane. The telescopic protection system comprises a telescopic cylinder and a main valve used for controlling the oil feeding and returning state of the telescopic cylinder, and further comprises a connecting / disconnecting valve and a reversing valve, wherein a first working port of the main valve is connected with a third working port of the telescopic cylinder, and a second working port of the main valve is connected to a first working port of the telescopic cylinder via the connecting / disconnecting valve; a liquid control port of the connecting / disconnecting valve is selectively communicated with an external oil source or an oil discharge channel via the reversing valve. The telescopic protection system disclosed by the invention ensures normal telescopic action of the telescopic cylinder, can prevent the telescopic cylinder from extending out passively due to oil pressure of a core tube, and improves the controllability of the telescopic cylinder. The telescopic protection system is arranged on the crane.
Description
technical field [0001] The invention relates to the technical field of telescopic protection, in particular to a telescopic protection system and a crane. Background technique [0002] In recent years, a telescopic arm with a single telescopic oil cylinder has appeared in the field of cranes. The piston rod of the telescopic oil cylinder is connected to the basic arm. The cylinder barrel is provided with a cylinder head, and two corresponding cylinder pins are provided on both sides of the cylinder head. The central axis of the two cylinder pins is in the same plane as the central axis of the telescopic oil cylinder, and the cylinder barrel of the telescopic oil cylinder can selectively lock or release its relative to any section of the telescopic arm when the above-mentioned cylinder pin is stretched out or retracted. Location. In addition, arm pins are provided between adjacent telescopic arms and between the basic arm and the first telescopic arm, and the relative positi...
Claims
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IPC IPC(8): B66C23/88B66C23/687
Inventor 蔡旺镔禹阳华简桃凤
Owner SANY AUTOMOBILE HOISTING MACHINERY