Load limiting device of long oil cylinder jack for crane

Abstract

The invention discloses a load limiting device of a long oil cylinder jack for a crane. The load limiting device of the long oil cylinder jack for the crane comprises a device body, wherein a device shell is arranged on the outer side of the device body, a first hydraulic base and a second hydraulic base are arranged at the upper end of the device body, the second hydraulic base is located on one side of the first hydraulic base, a first channel is formed in the device body, a high-pressure oil outlet steel ball and a low-pressure oil outlet steel ball are arranged at one end of the first channel, and a second channel is arranged at the other end of the first channel. According to the load limiting device of the long oil cylinder jack for the crane, the purpose that the two load limiting oil ways can perform load limiting when the crane bears high-gear loads and low-gear loads is achieved, the crane can support the load not smaller than 100% of the rated load and not larger than 125% of the rated load during pumping pressure for the lowest load and pumping pressure for the highest load when the crane is located at the horizontal position, and therefore, the purpose that the load limiting device is adjustable is achieved.

Description

technical field [0001] The invention relates to the field of jacks for cranes, in particular to a load limiting device for long oil cylinder jacks for cranes. Background technique [0002] The load limiting device of the long oil cylinder jack for cranes is a support device for limiting the load of the jack. It is clearly stipulated in the American Standard "Safety Standards for Movable Vehicle Lifting Equipment" that a workshop crane with an internal load limiting device should be able to When the cantilever is in the horizontal position, pump a measured load until the load limiting device works. At this time, the crane should be able to support a load not less than 100% of the rated load and not greater than 125% of the rated load. With the continuous development of technology , people are also more and more higher for the manufacturing process requirement of the load limiting device of the long oil cylinder jack used for cranes. [0003] The existing load-limiting device...

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Problems solved by technology

[0003] The existing load-limiting device of the long oil cylinder jack for cranes has certain disadvantages in use, and the existing cranes have four levels of bearing capacity, but the load-bearing pressure source can only adjust the bearing capacity of one of the gears. The safety of the crane has adverse effects, which is not conducive to people's use, and has brought certain adverse effects to people's use process. Therefore, we propose a load-limiting device for long cylinder jacks for cranes. In order to reduce the impact of this safety problem , requiring at least the minimum load force and the maximum load force to achieve a limited load

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