JPH0986875A - Travelling crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the drive energy at the light work time and reduce a transportation cost, while having a boom attachment which can bear a heavy load. SOLUTION: An upper turning body 14 is placed on a lower travelling body 12 through a turning mechanism 13. Two boom attachments 15, 16 are installed parallelly in left and right on the upper turning body 14 and hooks 19, 20 are hung down on the booms 17, 18 respectively. The right/left booms 17, 18 are formed independently and respectively so as to be risen/fallen freely and the right/left hooks 19, 20 can also be wound up/down independently. At a heavy work, one load 39 is hung by right/left hooks 19, 20 and operated simultaneously by interlocking the boom attachments 15, 16. While, at a light load, only one side boom attachment is operated and a load is hung and a drive energy is saved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling crane, and more particularly to a boom attachment for a traveling crane.

[0002]

2. Description of the Related Art In recent years,
With the increase in size of traveling cranes, the size and weight of boom attachments have become extremely large. Therefore, the boom attachment needs to be disassembled finely because it is overloaded when it is transported by land, and the transportation work is extremely complicated. In addition, when it is difficult to move by land, sea transportation is required, which takes time and increases transportation costs.

Further, even in the case of light work, since a huge boom attachment is operated, drive energy is wasted. Therefore, while having a boom attachment capable of withstanding a large load, a technical problem to be solved in order to operate with a small driving energy at the time of light work and to reduce the transportation cost arises. The purpose is to solve this problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, in which an upper revolving structure is mounted on a lower traveling structure via a revolving mechanism, and two upper revolving structures are mounted on the upper revolving structure. The present invention provides a traveling crane in which boom attachments are arranged side by side.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show a traveling crane 11, in which an upper revolving structure 14 is placed on a lower traveling structure 12 via a revolving mechanism 13, and two boom attachments 15 and 16 are mounted on the upper revolving structure 14. It is installed side by side.

Left and right boom attachments 15, 16
Respectively, hooks 19 and 20 are suspended from the ends of the booms 17 and 18, respectively, and the ends of the booms 17 and 18 and the ends of the mast booms 21 and 22 are connected by pendant ropes 23 and 24. Further, the bail 27, 28 is attached to the left and right gantry 25, 26, and the boom / elevation ropes 31, 32 are wound around the bridle 29, 30 and the bail 27, 28.

The wire ropes 33 and 34 of the left and right hooks 19 and 20 and the boom raising and lowering ropes 31 and 32 are wound around the drums of the winch units 35 and 36, respectively, and the left and right hooks 19 and 20 are wound independently. In addition to being able to raise and lower, the left and right booms 17 and 18 are independently formed so that they can be raised and lowered.

A cabin 37 is provided on the right front part of the upper revolving structure 14, and a counterweight 38 is mounted on the rear part of the upper revolving structure 14. Thus, in heavy work, a large load is suspended by using the two boom attachments 15 and 16. As shown by the chain double-dashed line in FIGS. 1 and 2, one load 39 is hung by the left and right hooks 19 and 20, and the left and right winch units 35 and 36 are simultaneously driven to raise and lower the left and right booms 17 and 18. The load 39 is lifted and moved while controlling the angle and the heights of the hooks 19 and 20 to be equal.

At this time, the left and right boom attachments 1
A load of half the load of the load 39 is applied to each of 5 and 16. Therefore, the strength of the booms 17 and 18 may be designed to withstand a load half the maximum load, and the booms can be made smaller and lighter.

On the other hand, in light work, only a boom attachment on one side is operated to suspend a small load. For example, as shown in FIG. 4, the load 40 is hung by the left hook 19,
Operate one winch unit 35 to move the left boom 1
The elevation angle of 7 and the height of the hook 19 are adjusted, and the load 40 is lifted and moved.

As described above, if each boom is made smaller and lighter in advance and only one boom attachment is used for light work, the driving energy is small and the operating cost can be saved.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0013]

As described above, according to the present invention, since two boom attachments are arranged side by side on the upper swing body, it is possible to suspend a load twice the design strength of each boom. Therefore, even with a traveling crane designed to suspend a large load, the boom can be reduced in weight without being large in size, and production costs and transportation costs can be reduced.

In addition, by using only the boom attachment on one side during light work, the driving energy can be reduced and the operating cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a traveling crane according to an embodiment of the present invention, in which two boom attachments are used to suspend a large load.

FIG. 2 is a front view of the traveling crane in a state in which a large load is suspended by using two boom attachments.

FIG. 3 is a plan view of a main part of the traveling crane in a state where a large load is suspended by using two boom attachments.

FIG. 4 is a side view of the traveling crane in a state in which only one boom attachment is used to suspend a small load.

[Explanation of symbols]

 11 Traveling Crane 12 Lower Traveling Body 13 Revolving Mechanism 14 Upper Revolving Body 15,16 Boom Attachment 17,18 Boom 19,20 Hook

Claims (1)

[Claims] 1. A traveling crane, wherein an upper revolving structure is mounted on a lower traveling structure via a revolving mechanism, and two boom attachments are arranged side by side on the upper revolving structure.