Multi-working-condition auxiliary boom structure and crane using same

Abstract

The invention discloses a multi-working-condition auxiliary boom structure which comprises a boom rest, a first jib luffing mechanism (1) used for converting a working angle of an auxiliary boom, and an lengthened section (2) used for increasing the length of the boom rack, wherein the lengthened section is mounted at the front end of the first jib luffing mechanism, and a second jib luffing mechanism (3) is arranged on the boom rest at the front end of the first jib luffing mechanism. The invention further provides a crane with the multi-working condition auxiliary boom structure. The auxiliary boom mechanism is detachably connected to a hoisting boom of the crane. According to the multi-working-condition auxiliary boom structure, on the basis of an original boom rest structure, the second jib luffing mechanism is additionally provided, so that a rotary point is additionally arranged at the front section of an original boom rest system, so that the flexibility of converting the boom rest angle and selecting a working condition is increased; the original boom rack structure is not changed, a newly-designed rotary device is used as an option configuration, without influencing the constitution of the original boom rest structure; the rotary device can be assembled on multiple positions of the boom rest system, so that the flexibility of converting the boom rest angle and selecting the working condition is increased, and the product applicability is relatively wide.

Description

technical field [0001] The invention relates to a crane, in particular to a multi-working-condition jib structure and a crane using the structure. Background technique [0002] Cranes are widely used in the field of engineering machinery technology. The crane lifts heavy objects through the boom and the wire rope wound around the main pulley of the boom. Depending on the lifting needs, the jib of a crane usually has a main jib and a jib. Such as figure 1 As shown, the auxiliary jib is a truss arm structure installed at the end of the main jib. The angle change is mainly completed by the combination of the swivel frame 13 and the pull plate 12. The length is adjusted by increasing or decreasing the extension joint 2, which is used to expand the working range of the jib system. , to increase the lifting height of the vehicle. Thus, in figure 1 Under this structure, the working range that can be realized according to the length of the extension section 2 is also different, ...

AI Technical Summary

Problems solved by technology

At present, the truss arm in the industry has two ways of angle transformation: fixed value angle and stepless amplitude change. The variable angle rotation point is designed at the connection between the connecting frame and the rotating frame or the basic jib. The relative distance between the rotation point and the main boom head is fixed. When the floor height is higher than the rotation point during construction, the truss arm will not be able to adjust the angle, such as image 3 As shown, the current solution to this problem is to increase the length of the boom system in front of the swivel frame 13 on the basis of the existing truss arm form, that is, to increase the cross-sectional size of the extension section 2, and then move the installation position forward to make the rotation point relatively backward. To achieve the purpose of extending the working range of the boom system, its working range is as follows: Figure 4 As shown (in order to simply analyze the jib to make the problem clear, here it is assumed that the elevation angle of the main boom is 90°), but this solution simply increases the length of the main boom (box-shaped boom), which will lead to a large increase in the weight of the jib, which is not conducive to lifting Maximize performance

Its disadvantages are as follows: 1. It is not flexible enough, and the cross-section of the extension section increases, resulting in an increase in the weight of the boom itself, which affects the performance of the vehicle

2. Sacrifice the combination of the original working conditions, and its working scope is as follows: Figure 4 As shown, after the section of the extension section 2 is increased, the operation of the original combined working condition will not be possible. Although the working range is enlarged, it becomes simplified

Moreover, in some construction sites at present, the distribution of buildings on each floor is relatively dense, and the distance between buildings is very small. It is impossible to extend the operating range of the jib by increasing the operating range.

Images