Suspension arm sequential stretching/retracting hydraulic system
A sequential telescopic and hydraulic system technology, which is applied in the boom sequential telescopic hydraulic system and the field of sequential telescopic, can solve the problems of decreased reliability, affecting the appearance of the boom, and increasing the structural dimensions of the whole machine, etc., to achieve the effect of sequential telescopic and reliable
Active Publication Date: 2012-11-07
CHANGZHI QINGHUA MACHINERY FACTORY
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Problems solved by technology
At present, there are two main ways to achieve sequential expansion and contraction of the boom of the truck-mounted crane. One requires adding a section of hydraulic hose to the boom, which requires adding a hose reel or hose guide chain, which affects the boom. The beautiful appearance increases the overall size of the whole machine structure; the second is to control the on-off of the oil circuit by installing a sequence valve, so as to realize sequential expansion and contraction, but if the number of telescopic boom sections is more than 3 sections, the sequence of this method will The reliability of stretching will decrease
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[0018] like figure 1 As shown, a boom sequential telescopic hydraulic system includes a first-stage telescopic cylinder 1, a second-stage telescopic cylinder 2, a third-stage telescopic cylinder 3, a first-stage reversing valve 7, a second-stage reversing valve 13, and a first one-way valve. 4. The second one-way valve 5, the third one-way valve 10 and the fourth one-way valve 11, the first-stage reversing valve 7 is installed at the end of the first piston rod 16 in the first-stage telescopic cylinder 1, and the second-stage reversing The valve 13 is installed at the end of the second piston rod 17 in the secondary telescopic cylinder 2;
[0019] The structure of the first-level telescopic cylinder 1 is as follows: the first piston rod 16 is sleeved in the cylinder barrel of the first-level telescopic cylinder 1, the first piston rod 16 is hollow, and the first-level telescopic oil passage 6 is located inside the cylinder barrel. One end of the first-stage telescopic oil pas...
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The invention discloses a suspension arm sequential stretching / retracting hydraulic system belonging to the technical field of telescopic arm frames. The invention aims to provide a suspension arm sequential stretching / retracting hydraulic system which does not influence the overall dimension and realizes reliable sequential stretching / retracting. The technical scheme is as follows: a first-level reversing valve is mounted at the end of a first piston rod in a first-level telescopic cylinder; a second-level reversing valve is mounted at the end of a second piston rod in a second-level telescopic cylinder; an oil channel port A3 of the first-level telescopic cylinder and an oil channel port A4 of the second-level telescopic cylinder are connected through an oil pipe; an oil channel port A7of the second-level telescopic cylinder and an oil channel port A8 of a third-level telescopic cylinder are connected through an oil pipe; an oil channel port B2 of the first-level telescopic cylinder and an oil channel port B3 of the second-level telescopic cylinder are connected through an oil pipe; and an oil channel port B5 of the second-level telescopic cylinder and an oil channel port B6 ofthe third-level telescopic cylinder are connected through an oil pipe. The suspension arm sequential stretching / retracting hydraulic system disclosed by the invention is applicable to sequential stretching / retracting of the telescopic arm frame of a lorry-mounted crane or automobile crane.
Description
technical field [0001] The invention discloses a boom sequential telescopic hydraulic system, belongs to the technical field of telescopic booms, and is particularly suitable for the sequential expansion and contraction of the telescopic booms of truck-mounted cranes or truck cranes. Background technique [0002] The sequential telescopic extension of the boom of the truck-mounted crane means that each telescopic boom completes the telescopic action in a certain telescopic sequence. From outside to inside, the order of retracting arms is opposite to that of extending arms, that is, inside first and then outside. At present, there are two main ways to achieve sequential expansion and contraction of the boom of the truck mounted crane. One is to add a section of hydraulic hose to the boom, which requires adding a hose reel or a hose guide chain, which affects the boom. The beautiful appearance increases the overall size of the whole machine structure; the second is to control...
Claims
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IPC IPC(8): B66C23/687B66C13/20
Inventor 汤志远王乐有覃卫文许燕强崔丽君刘平
Owner CHANGZHI QINGHUA MACHINERY FACTORY