JPH0411476B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tower type mobile crane.

When carrying out lifting work in narrow spaces, recently mobile cranes such as telescopic truck cranes (others include wheel cranes and crawler cranes) are used.
are commonly used, but because they all have a tilting jib type, it is difficult to use them in narrower spaces.

Therefore, cranes equipped with tower-type booms (jibs) have been developed to solve the above-mentioned difficulties.

That is, to explain this in the case of a truck crane, as shown in FIG. 1, in the case of a truck crane 1 installed in a narrow area and a tilting jib 2, a building 3 becomes an obstacle. However, in the case of a tower-type boom (jib) 4, it is possible to bypass the building 3 and carry out the lifting work.

However, the tower type boom 4 can be assembled by, for example, laying the tower 4a sideways on the ground as shown in FIG. 2, and connecting the separately assembled boom 4b with pins during ground work, or as shown in FIG. The boom 4b assembled to the tower 4a in a horizontal folding structure with a hinge mechanism is rotated and connected with a pin,
Thereafter, a procedure is taken in which the tower 4a and the boom 4b are simultaneously raised to the vertical position, and then the boom 4b is raised into the working position.

However, by the time the final operating status was reached, Tower 4a
In addition, the movement of the boom 4b requires a large amount of ground plane space in addition to that occupied by the crane mount, that is, in the case of a truck crane, the truck chassis, but this space may not always be secured in narrow areas. , assembly may become impossible.

The present invention has been made in view of the above circumstances, and the gist thereof is to provide a tower-type mobile crane having a telescoping tower and a boom, the base end of which is pivoted on the vehicle body so as to be able to raise and lower. A sliding guide frame that is movable along the tower and that can be fixed to the top of the tower via an attached locking member is fitted and assembled to the tower of the type, and the sliding guide frame is assembled to the tower. When the base end of the telescoping boom is pivoted and the telescoping boom is attached to the telescoping tower in such a manner that the sliding guide frame is located at the lower end of the lowest end of the telescoping tower. By doing this, the sliding guide frame, which is fitted and assembled into the lowest tower and which is pin-coupled to the base of the boom, is raised while the telescoping tower is in a vertical position, and connected to the top of the telescoping tower. After that, it was assumed that the ground work area required for assembly could be done within the area of the crane mount by extending the telescopic tower and tilting the telescopic boom, or by tilting the telescopic boom and extending the telescopic tower. At the point.

Hereinafter, this will be explained in detail based on an embodiment diagram in the case of a truck crane.

FIG. 4 is a procedure diagram of the present invention, in which the telescoping boom is tilted and put into use.

In the figure, reference numeral 5 denotes a sliding guide frame which is fitted into the lowermost part of the telescopic tower 4a and connected with a pin to the base of the telescopic boom 4b.

When storing (the telescopic boom 4b is retracted and attached to the telescopic tower 4a, the guide rope is double, and is set on the telescopic boom 4b from both sides of the telescopic tower 4a) ( From a), first raise the telescopic tower 4a (b).

The sliding guide frame 5 is raised using the parent hook 6, and the top of the telescoping tower 4a and the sliding guide frame 5 are connected via a locking member (not shown) attached to the frame 5 ( c).

Extend the telescoping tower 4a (d).

Tilt the telescoping boom 4b (e).

Extend the telescoping boom 4b (f).

Alternatively, from (a), first raise the telescoping tower 4a (b').

Raise the sliding guide frame 5 by the parent hook 6,
The top of the telescoping tower 4a and the sliding guide frame 5 are connected via a locking member (not shown) attached to the frame 5 (c').

Tilt the telescoping boom 4b (d').

Extend the telescoping tower 4a (E').

The telescoping boom 4b is extended (f').

In this case, it is also possible to stand on a road on which power transmission lines or electric wires are installed, which is below the height of the telescopic tower or near the height of the telescopic tower.

According to the method of the present invention described above, all the ground work (the work of connecting the base end of the telescoping boom to the top of the telescoping tower) can be done within the area occupied by the truck chassis, so it is possible to do it in a narrower area than before. In addition to making it possible to perform lifting operations, the tower and jib are easier to assemble compared to general tower-front cranes, so you can get into the working position in a short time.

In the present invention, as described above, the sliding guide frame 5 is fitted onto the telescoping tower 4a, and the telescoping boom 4b is attached to the telescoping tower 4a. Therefore, it is also possible to remove the connection between the sliding guide frame 5 and the top of the telescoping tower 4a and extend only the telescoping tower 4a to use it as a tilting boom system. In this case, a larger capacity can be lifted compared to the tower type.

When used as a tilting boom as described above,
Since the boom can be stored at the bottom of the tower, it is advantageous in terms of moment.

[Brief explanation of drawings]

FIG. 1 is a comparative diagram of a truck crane with a tilting jib and a tower-type boom, FIGS. 2 and 3 are diagrams of a procedure for assembling a conventional tower-type boom, and FIG. 4 is a procedural diagram of the method of the present invention. 1... Truck crane, 2... Inclined jib, 3
... building, 4 ... tower type boom, 4a ... telescopic tower, 4b ... telescopic boom, 5 ... sliding guide frame.

Claims (1)

[Claims] 1. In a tower-type mobile crane having a telescoping tower and a boom, a telescoping tower whose base end is pivoted on the vehicle body so that it can be raised and lowered, and a crane that is movable along the tower and that is attached to the top of the tower. A sliding guide frame that can be fixed via the attached locking member is fitted and assembled, and the base end of the telescoping boom is pivotally fixed to the sliding guide frame, and the telescoping boom is attached. A tower type mobile crane, wherein the sliding guide frame is attached to the telescoping tower and is positioned at the lower end of the lowest stage of the telescoping tower.