JPH02117590A - Mobile crane - Google Patents

Abstract

PURPOSE:To enable a crane to be loaded on a truck by self-running and transported to a construction site without disassembly by a method wherein a plurality of posts the middle part in a longitudinal direction of which is divided are erected on an upper slewing body on a lower running body and disposed foldably, and a jib capable of freely rising and falling and expanding and contracting is mounted to the post positioned at an uppermost stage during erection. CONSTITUTION:A plurality of posts 16 and 22 of a crane are erected during a work, and a jib 35 is expanded and is caused to rise to a proper angle, and an upper slewing body 2 is slewed to perform a desired work. When the crane is transported to a other construction side, the jib 35 is contracted, and a plurality of posts 16 and 22 and the jib 35 are folded to bring them into a given horizontal state. The crane is self-run by means of a lower running body 1 and is loaded on a truck for transport via a slope bed and is transported to a next construction site.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mobile crane that can be applied to the construction of general housing.

[Prior Art] Using a crane for construction work on general housing makes the work safer and faster.

However, since houses are usually densely packed and the space around a house construction site is relatively narrow, it is desirable that cranes for house construction be small enough to work in tight spaces.

Furthermore, when transporting the crane from one construction site to another, it can be transported without dismantling it, and when it is loaded onto a transport truck, it can be folded without using a separate cargo handling device. It is desirable that the crane itself be self-propelled.

However, due to road conditions such as there are obstacles such as electric wires and telephone lines above the road, and there is a limit to the load capacity of the road,
There are limits to the size and weight of lanes that can be transported.

Therefore, the crane usually has to be dismantled during transportation, and the disassembled crane must be loaded onto a transportation truck or]
- Separate cargo handling equipment is required to unload the cargo from the rack.

Furthermore, disassembling and assembling the crane takes time.
It takes about 1 sho of time to be able to use the crane to perform the work at the next work site, resulting in poor work efficiency.

[Problem to be solved by the invention] Therefore, it is possible to easily perform work even in a narrow space, it can be folded with its own blade without having to be dismantled during transport, it can be self-propelled and mounted on a transport truck, and it is compatible with road conditions. We need a crane with good workability and work efficiency that will not be affected by the situation.

Therefore, in view of the above-mentioned circumstances, the present invention has been made for the purpose of providing a mobile crane that satisfies the above-mentioned performance.

[Means for Solving the Problems] The present invention includes a plurality of posts, each of which is divided in the middle in the longitudinal direction, on an upper revolving body installed on a lower traveling body, and is arranged so as to be foldable. The post located at the top of the tower is equipped with a jib that can be extended and contracted freely.

[Operation] During work, multiple posts are set up and the jib is extended and raised at an appropriate angle to perform work.

During transportation, the jib is reduced in size and the multiple posts and jib are folded before being transported.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

1 to 9 show an embodiment of the present invention.

Lower traveling body ■ Upper rotating body 2 which is swingably provided on the lower traveling body 2 Brackets 3 are placed at required positions in front of the lower traveling body and are spaced apart from each other by required intervals vertically and horizontally.
．． 4, and links 7.8 of the same length are attached to the bracket 3.4 through vertical pins 5.6 arranged at required intervals in the front and rear, left and right directions, as shown in FIG. The post bracket 1 is pivoted horizontally and parallelly and is attached to the other end of the link 7.8.
1 are connected via vertical pins 9 and 1a, and vertical pins 5. G.9
．． A parallel four-bar link is formed by a straight line formed by connecting the centers of the four-bar links 7 and 8, and the links 7 and 8 are integrally moved horizontally by a rotating means (not shown) while the parallel four-bar link is held. Make it possible to rotate.

The post bracket 11 includes a base plate 1-11a and a support plate llb erected on the base plate Ha.
Consisted of.

Support plate for post bracket ll) The lower end front surface of the lower post 1B is supported by the horizontal pin 15 on the support plate 11b, and the piston rod 18 of the hydraulic cylinder 17 whose lower end is pivotally supported on the support plate llb is connected to the upper end of the lower post 16. The lower post 16 can be raised and lowered by the hydraulic cylinder 17 connected to the front surface.

As shown in detail in FIG. 8, a bracket 21 is fixed to the rear surface of the upper end of the lower post 16 toward the rear, and a bracket 21 is fixed to the rear surface of the lower end of the upper post 22, which is located above the lower post 16 when it is erected. 23 and by inserting the horizontal pin 24 into the bracket 21.23, the lower post te and the upper post 22 can be connected.Horizontal pins 25 are attached to the rear surface of the upper end of the lower post 18 and the rear surface of the lower end of the upper post 22, respectively. Arm 27.2 through .26
The arms 27.28 are extended obliquely upward and downward to the rear of the post 18.22, and both arms 27.211 are connected by a horizontal pin 29, and a bracket is attached to the lower rear surface of the lower post 16. The upper end of the piston rod 31 of the hydraulic cylinder 30 is connected to the horizontal pin 29, and the bracket 49 is fixed to the front side of the upper end of the lower post 16 and the lower end of the upper post 22. The upper post 22 and the lower post 16 can be fixed by inserting a horizontal pin 32 through the front surface. The bottom side of the bracket 33 is the post 16.22
The upper post 22 is formed substantially vertically so as to be able to support the upper post 22 when folded.

A piston rod 3 of a fluid pressure cylinder 3G has a jib 35 pivotally connected to the upper end front surface of the upper post 22 via a horizontal pin 34 so as to be able to rise and fall freely, and the lower end is pivotally connected to the upper front surface of the upper post 22.
7 is connected to the jib 35 so that the jib 35 can be raised and lowered.

As shown in FIG. 9, the jib 35 is composed of jib bodies 35a, 35b, and 35c that are telescopically extendable and retractable.

A winch 38 is disposed on the rear surface of the midway part of the upper post 22 in the height direction, and a wire rope 39, which has one end fixed to the winch 38 and can be freely wound and unwound, is attached to a sheave 40° 41, 42, 4.
3.44, hangs downward from the tip of the jib 35, and suspends a hook 45 from the hanging portion.

In the figure, 46 is a counterweight, 47 is a driver's seat, and 48 is an outrigger.

When carrying out cargo handling work using the above-mentioned mobile crane, the post bracket 11 is attached to the vertical pin 5.6 as shown in FIG.
As shown in FIG. 1, the lower pos! 16, the upper post 22 is erected by the hydraulic cylinder 30, the horizontal bin 32 is inserted into the lower end front surface of the upper post 22 and the bracket 49, and the upper post 22 is fixed to the lower post 16, and the upper post 22 is fixed to the lower post 16. By horizontally rotating the bracket 11 and stopping it at the position shown in Fig. 5, the lower post 16
, the upper boss 22 is positioned in front of the upper revolving structure 2, the jib 35 is erected at a predetermined angle by the hydraulic cylinder 36, the jib bodies 35a, 35b, and 35c are extended, and the wire lobe 39 is paid out by the winch 38.
Alternatively, the work is carried out by winding up the material, raising and lowering the jib 35 as appropriate, and rotating the upper revolving body 2.

The levitation angle of the jib 35 during work is zero (0) as shown in Fig. 9.
horizontal state) to the maximum angle θ.

When transporting the mobile crane to another work site, the jib bodies 35a, 35b, and 35c are reduced in size, and
The jib 35 is lowered by the hydraulic cylinder 36 until it becomes parallel to the upper post 22, and the link 7.8 is horizontally rotated to move the post bracket 11 in front of the vertical pin 5.6 as shown in FIG. As shown in the figure, the lower post I6 and the upper post 22 are positioned laterally to the center of the two-part revolving body 2 with the lower post I6 and the upper post 22 in an upright state.

In this way, the lower post 16 and the -F part post 22 are rotated laterally when the post 1-16.22 is rotated when folded.
The lower post 1G and the upper post 22 do not need to be rotated laterally if the driver's seat 47 is narrowed and installed laterally, perhaps to prevent them from colliding with the driver's seat 47.

When the lower post groove and the upper post 22 are located laterally to the center of the upper rotating body 2, remove the horizontal pin 3220,
The fluid pressure cylinder 17.30 is connected to the piston rod 18,31
Operate in the direction of shrinking. For this reason, the lower post 16
rotates counterclockwise around the horizontal bin 15 in FIG. 1, and the upper post 22 rotates clockwise around the horizontal bin 24, so the lower post 16 and the upper post 22 fold up, As shown in FIG. 2, the lower post 16, the upper post 22, and the jib 35 are each in a horizontal state.

When the post l-IG, 22 and jib 35 are in a horizontal, predetermined state, the mobile crane is propelled by the lower traveling body l, ascends the slope, is loaded onto a transport truck, and is transported to the next work site. be done.

When the mobile crane mounted on the transport truck arrives at the next work site, the mobile crane is lowered from the transport truck along the ramp and assembled by the reverse procedure to that described above.

As mentioned above, the weight of the mobile crane can be reduced by making the whole crane compact, and the overall dimensions can be reduced by folding the lower post 1B, the upper post 22, and the jib 35. The size can be adjusted to suit the road conditions. Furthermore, the upper post can be made expandable and contractible to increase the length of the post.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] According to the mobile crane of the present invention, multiple posts and jibs can be folded and loaded onto a truck by self-propulsion without the need to dismantle them and without using any special cargo handling equipment. Therefore, transportation to the next work site and preparation for work at the next work site can be carried out quickly, and therefore, various excellent effects such as improved work efficiency and work efficiency can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view of one embodiment of the mobile crane of the present invention, with the lower post, upper post;
Figure 2 is an explanatory diagram of the mobile crane shown in Figure 1 with the lower post, upper post, and jib folded.
Figure 4 is a detailed explanatory view of the lower end of the lower post of the mobile crane in Figure 1, Figure 5 is a view taken in the direction of arrow V-■ in Figure 4, and Figure 6 is a An explanatory diagram of the post bracket in a state in which it has been rotated in the horizontal direction. Figure 7 is a view from the ■-■ direction arrow in Figure 4. Figure 8 is an illustration of the vicinity of the lower post and upper post of the mobile crane in Figure 1. Detailed explanatory drawing, FIG. 9 is an explanatory drawing when the mobile crane of FIG. 1 is used for work. In the figure, 1 is a lower traveling body, 2 is an upper revolving body, 11 is a post bracket, 16 is a lower post, 22 is an upper post, 35
indicates a jib. Figure 2 Figure 3 Figure 6 Figure 7

Claims (1)

[Claims] 1) On the upper revolving body installed on the lower traveling body, multiple posts with longitudinally divided mid-sections are installed so that they can be erected and folded, and the post located at the top stage when erected can be raised and lowered freely. A mobile crane characterized by having an extendable jib.