JP2001048466A - Overhead crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a work execution cost by relieving the installation accuracy of a running rail while comparing with the past. SOLUTION: This overhead crane is provided with a pair of running rails 2 arranged mutually and parallelly with the ceiling of a structure, running devices 3 for running along respective running rails 2, a pair of saddle members 4', 4' installed on these running devices 3 respectively, a guarder member 5' installed between a pair of saddle member 4', 4' and a hoist runnable along the guarder member 5'. The guarder member 5' is installed displacably in the extending direction (x direction) of the guarder member 5' against the saddle member 4'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead crane for transporting materials, equipment and the like in factories, construction sites and the like.

[0002]

2. Description of the Related Art The construction of a conventional overhead crane will be described with reference to FIGS. Overhead crane 1 shown in FIG.
Is mounted on a roof of a factory or a roof frame in an all-weather construction site, and a pair of traveling rails 2 and 2 disposed parallel to each other on the roof and the like. A pair of saddle members 4, 4 attached to the respective traveling devices 3, 3, a girder member 5 laid between the saddle members 4, 4, and a hoist 6 that can travel along the girder member 5. It is roughly constituted from.

FIG. 3 is an enlarged view showing the periphery of the traveling rail 2. As shown in the drawing, the traveling rail 2 is formed as a member having a substantially I-shaped cross section, and the wheels 7 of the traveling device 3 attached to the saddle member 4 travel on the lower flange 2 a of the traveling rail 2. It has been. Also,
As shown in the figure, the saddle member 4 and the girder member 5 are rigidly connected by bolts 8,8.

[0004]

The above-described overhead crane 1
Since the girder member 5 is fixed to the saddle member 4, the installation accuracy of the traveling rails 2 supporting the saddle member 4 becomes important.

FIG. 4 is an enlarged view of the wheels 7 and the traveling rail 2 in FIG. As shown in the drawing, the wheel 7 has an end 7a disposed with a predetermined clearance C between the end 7a and a side edge 10 of the lower flange 2a of the running rail 2. Is not accurately maintained at a constant level, and if the distance is larger or smaller than the clearance C depending on the location, the wheel 7
May come into contact with the side edge 10 of the lower flange 2a, which may hinder the traveling of the traveling device 3.

Therefore, the tolerance of the span between the running rails 2 and 2 must be equal to or less than the clearance C described above, and is limited to about 10 mm or less in an actual structure. However, securing such high accuracy requires a great deal of time and effort, which causes an increase in construction costs.

Further, particularly when the overhead traveling crane 1 is used in an all-weather construction site or the like, a roof frame covering the construction site on which the overhead traveling crane 1 is installed is usually
If the overhead crane 1 is used for a long period of time because it is a temporary structure, the installation accuracy of the traveling rail 2 may be changed due to displacement, inclination, etc. of the temporary structure itself. In such a situation, it is very difficult to secure the high accuracy as described above.

Accordingly, an object of the present invention is to provide an overhead traveling crane that can reduce the installation accuracy of the traveling rail as compared with the prior art, thereby reducing the construction cost. I do.

[0009]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is,
The overhead traveling crane according to claim 1, a pair of traveling rails disposed parallel to each other on a ceiling of the structure, a pair of traveling devices traveling along the traveling rails, and attached to each of the traveling devices. A pair of saddle members, a girder member bridged between the pair of saddle members, and a hoist that can travel along the girder member, wherein the girder member is, with respect to the saddle member, The girder member is attached so as to be displaceable in the extending direction of the girder member.

With such a configuration, even if the traveling rail is not arranged completely parallel, the girder member is displaced with respect to the saddle member, so that the saddle member and the girder member may be displaced due to an installation error of the traveling rail. It is possible to follow the displacement.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. Since the schematic configuration of the overhead crane described here is almost the same as that of the overhead crane 1 in the above-described conventional technology, only the portions different from the overhead crane 1 will be described here, The same reference numerals will be given to the same components, and the description thereof will be omitted.

The overhead crane 1 'of this embodiment is different from the conventional overhead crane 1 in that a saddle member 4' is provided.
And the girder member 5 '. In the overhead crane 1 ', a saddle member 4' and a girder member 5 'are attached via a slide mechanism 12.

The slide mechanism 12 includes a bar 13 attached to the saddle member 4 'in the same direction as the direction in which the girder member 5' extends (the x direction in the figure), and an insertion hole 14 through which the bar 13 can be inserted. And the bracket 15 provided. With such a configuration, since the bracket 15 can be displaced in the x direction along the bar 13, the girder member 5 can be displaced in the x direction along the saddle member 4 '.

In this case, as shown in the figure, assuming that clearances of a size S (mm) are provided on both sides of the bracket 15 in the x direction with respect to the saddle member 4 ', the girder member 5 is provided. Is 2S in the x direction.
(Mm). Therefore, assuming that the tolerance of the span between the traveling rails 2 and 2 in the conventional overhead crane 1 is 10 mm, the tolerance of the span between the traveling rails 2 and 2 in the overhead crane 1 'of this embodiment is 10 mm. ± 2
S (mm).

As described above, according to the overhead traveling crane 1 'of the present embodiment, the installation accuracy of the traveling rails 2, 2 can be reduced, so that the construction period for installing the traveling rails 2, 2 can be shortened. Labor can be reduced, which can contribute to cost reduction. In addition, it is possible to easily attach to a temporary structure or the like that is shifted or inclined to the structure itself, and it is possible to expand the applicable range of the installation target structure. Furthermore, in general, when the overhead crane is mounted on the temporary structure, there is a problem in the work environment such as a place where the mounting adjustment work of the traveling rail is performed at a high place or a narrow place. In the overhead crane 1 'of the present embodiment, the installation accuracy of the traveling rails 2, 2 is reduced, and the installation operation of the traveling rails 2, 2 is simplified. Therefore, it is possible to improve work safety. Therefore, the overhead crane 1 'of the present embodiment
Can be suitably used in all-weather construction sites and the like.

[0016]

As described above, according to the overhead crane of the present invention, it is possible to ease the installation accuracy of the traveling rail, shorten the construction period when installing the traveling rail, and reduce labor. And contribute to cost reduction. In addition, since the installation accuracy of the traveling rail can be reduced, the applicable range of the installation target structure can be expanded. Further, since the installation work of the traveling rail is facilitated, the safety of the work can be improved. ,

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional view of a main part of an overhead crane schematically showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional overhead crane.

FIG. 3 is an enlarged vertical sectional view of a main part in FIG. 2;

FIG. 4 is an enlarged sectional view showing the positional relationship between the traveling rail and the wheels of the traveling device shown in FIG. 3 in a further enlarged manner.

[Explanation of symbols]

 1 'overhead crane 2 traveling rail 3 traveling device 4' saddle member 5 'girder member 6 hoist

Claims (1)

[Claims] 1. A pair of traveling rails arranged in parallel with each other on a ceiling of a structure, a pair of traveling devices traveling along each traveling rail, and a pair of traveling devices attached to each of these traveling devices. A saddle member, a girder member bridged between the pair of saddle members, and a hoist that can travel along the girder member, wherein the girder member extends the girder member with respect to the saddle member. An overhead traveling crane that is mounted so as to be displaceable in the direction in which it lies.