Movable hoisting device supporting leg and movable hoisting device with the supporting leg

Abstract

The invention discloses an outrigger of a movable lifting device; the outrigger comprises a movable outrigger joint with at least one expandable level; the expansion direction of each level of movable outrigger joint has a downward inclining angle; outrigger joints are symmetrically arranged on the lifting device to form an arc support for the lifting device. The invention also provides a lifting device, correspondingly arranging the outrigger of the movable lifting device. Compared with the prior art, the invention provides the outrigger of the movable lifting device to provide the arc support for the lifting device. The arc support can prevent the vertical pressure on the outrigger by a load of the lifting device from concentrating on some special positions, and lighten the downward sinking of the lifting device caused by applying a horizontal vertical L-shaped outrigger in the prior art.

Description

technical field [0001] The invention relates to lifting equipment technology, in particular to a movable lifting equipment support leg. The present invention also provides a movable lifting device with the above outrigger. Background technique [0002] In various construction, loading and unloading occasions, lifting equipment is widely used. Large and movable lifting equipment such as cranes all have multiple outriggers, and the effect of the outriggers is to provide support for the lifting equipment when the lifting equipment performs lifting operations. These outriggers are capable of rotating and telescoping, and when the lifting equipment needs to move, the outriggers retract into a moving position without providing support. When the lifting equipment is used for lifting operations, the outriggers are extended to support the ground, providing support for the lifting equipment and increasing the supporting area of ​​the crane. The above functions prevent the lifting e...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned L-shaped legs also have obvious disadvantages

[0005] First of all, after the horizontal extension beam 1-1 of the above-mentioned L-shaped leg is loaded, the direction of the force it receives is perpendicular to the extension direction of the horizontal extension beam 1-1, so that the horizontal extension arm 1-1 of the leg when lifting 1 produces a large bending stress, and the horizontal extension beam 1-1 will bend downward significantly, causing the overall body to sag

Moreover, since the force of the supporting legs 1-2 in the vertical direction acts on one side in most cases, it will also bend in a certain direction, which will cause the vertical oil cylinder controlling the expansion and contraction of the supporting legs 1-2 to bear a large load. Lateral force will affect its normal expansion and contraction, and even cause the cylinder to fail

In addition, when the L-shaped outrigger is stressed, the stress is concentrated at the lap joint 1-3 of the outrigger and the right angle 1-4 of the vertical section. Therefore, these parts need to use very high-strength materials or strengthen the design to meet the design requirements , which makes it difficult to manufacture

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