Boom support device and construction machinery

Abstract

A boom support device comprises a boom support part which is mounted on a lifting seat (27). The lifting seat (27) is connected to and supported on the upper portion of a vertical telescoping movable part of at least one support oil cylinder. The lower portion of each supply oil cylinder is fixed. A rodless cavity of each support oil cylinder is connected to an oil port of a corresponding accumulator through a corresponding rodless cavity connecting oilway (31), one-way throttle vales (7 and 14) and damping holes (8 and 13). The invention further discloses engineering machinery with the boom support device. The boom support device has the advantages that impact and vibration absorption capability of a boom can be improved evidently, rigid collision can be eliminated relatively effectively, and accordingly damage to the boom can be relieved relatively effectively, and service life of the boom can be prolonged.

Description

technical field [0001] The invention relates to a jib support device. In addition, the present invention also relates to a construction machine installed with the boom support device, such as a concrete pump truck, a mobile crane, and the like. Background technique [0002] Concrete pump trucks, mobile cranes and other engineering machinery are known to have booms, for example, the distribution boom of concrete pump trucks and the boom of mobile cranes. [0003] After the boom work is completed, the boom needs to be folded and supported on the supporting foundation (such as the chassis of a concrete pump truck or the chassis of a truck crane), see figure 1 As shown, in this state, the jib usually has two support points, that is, the slewing platform hinged by the first jib section of the jib and the jib supporting device 3a set on the support foundation. In the non-working state, the jib 1a It is placed on the boom support device 3a in the folded state. In order to avoid t...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned boom support device of the prior art has the following disadvantages: first, the existing boom support device has a too simple vibration damping technology, and only fixes some vibration damping materials on the support device, such as elastic pads such as rubber pads. , which is a relatively passive vibration reduction method, and the vibration reduction effect is relatively poor

When the jib is retracted and then falls, there is a certain impact, but the rubber pad cannot fully absorb the impact, resulting in most of the impact being absorbed by the jib and the supporting base (such as the chassis of the pump truck); secondly, using the existing Vibration reduction method, when pump trucks, mobile cranes, etc. are running, the boom support device cannot fully absorb the vibration of the boom, especially on the construction site, the road conditions on the construction site are relatively bad, and the road surface is uneven. The vibration of the lower arm frame is greater, and the vibration damping method of elastic pads alone cannot effectively absorb the vibration, which will inevitably accelerate the wear of the arm frame and increase the possibility of fatigue fracture; thirdly, with the development of the city, in order to To meet the ever-increasing pumping height, lifting height, etc., the length of the boom of construction machinery will continue to increase, which will lead to more severe impact and greater vibration at the support far from the boom luffing cylinder, while the existing The vibration reduction and impact absorption method of the boom support device is just a simple rubber pad. As a typical passive vibration reduction device, its effect cannot meet the vibration reduction needs of the boom

Fourth, the elastic pads used as vibration-damping materials are generally made of organic materials. If they are in a compressed state for a long time, they will produce irreversible deformation, and the vibration-damping effect will gradually decrease, which will aggravate the vibration of the boom

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