JPS6210314Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of an overhead crane used for cargo handling work in a factory.

Conventionally, as shown in FIGS. 1 and 2, an overhead crane has a runway girder 3 mounted on a plurality of brackets 2 protruding from the upper part of a factory inner wall 1 at appropriate intervals.
A traveling rail 4 is fixed on this runway girder 3 with hook bolts (not shown), and a traveling wheel 7 pivotally supported by a saddle 6 of an overhead crane 5 rolls on this traveling rail 4. It is configured to run in a direction perpendicular to the plane of the paper in FIG.

In this case, the crane girder 8 of the overhead crane 5 and the saddle 6 are connected by placing the crane girder 8 directly on the saddle 6 and tightening them with bolts 9 and nuts (not shown). A hoisting machine, usually composed of an electric hoist 10 or the like, is suspended from the crane girder 8 so as to be able to move freely. In the figure, 11 is a traveling electric motor of the overhead crane 5, 12 is a buffer for the saddle 6, 13 is a hook block of the electric hoist 10, and 14 is a hook.

In such a conventional overhead crane, if a crane lift height is to be increased, a raising member must be provided between the saddle 6 and the crane girder 8 to increase the crane height. Since the crane travel offset (dimension C shown in the drawing, which is the horizontal distance between the travel stop position of the lifting equipment and the end of the travel rail) is inevitably determined by the length of the saddle 6, this travel offset C can be made smaller. If this were to be done, the hook 14 of the electric hoist 10 would have to be suspended horizontally as shown by the solid line, which would have the disadvantage of having an adverse effect on the hoist and endangering the operator. Moreover, as an overhead crane that only expands the working space, the ones shown in Utility Model Publication No. 34-16627 and Japanese Patent Publication No. 54-24583 have been devised. In this case, the former type of overhead crane uses multiple hoisting machines, so if you want to widen the working range of the crane as a whole, you will have to change the suspension between hoisting machines. It was hot. The latter type of overhead crane has a traveling frame that travels on the ceiling, a rotating frame that rotates around the outer periphery of the traveling frame, a telescopic boom that is fixed to the rotating frame and extends and contracts, and a hook that is moved up and down from the tip of the telescopic boom via a rope. The structure is complicated, and a torsional moment acts on the entire traveling frame (crane girder), requiring great strength in the traveling frame itself. The drawback was that the overall length of the saddle's wheelbase had to be lengthened because the hook was raised and lowered.

This invention was made to eliminate these drawbacks of the prior art, and aims to provide an overhead crane that is extremely simple in structure and has a larger cargo handling capacity than conventional overhead cranes.

An example of this invention is shown below in Figures 3 and 4.
To explain the figure, in this case, the lower ends of two rows of arms 15, 15 are attached to the upper surface of the saddle 6 so as to sandwich the center of the wheel base of the saddle 6.
6, and a parallel link mechanism 18 is interposed at the upper ends of the arms 15, 15 so that the lower surface of the end of the crane girder 8 can be rotated about shafts 17, 17. Both ends of hydraulic cylinders 19, 19 are pivotally connected between intermediate parts of the arms 15, 15 and both ends of the saddle 6, respectively. 20 in FIG. 4 is a stopper.

With this overhead crane configured in this way,
By operating the hydraulic cylinders 19, 19, the crane girder 8 rotates in a trajectory that draws an arc with respect to the traveling direction of the overhead crane, as shown by the broken line in FIG. The running side C dimension becomes smaller by the horizontal distance B from the center of the wheel base. By this, the fifth
Compared to the conventional overhead crane shown by the solid line in the figure, the cargo handling capacity of this invention can be increased as shown by the broken lines on both sides. In other words, the difference in crane lift height (dimension A in Fig. 6) can be made higher than in the past, and the crane travel bias C becomes smaller, so if the hoist lift height is H and the crane travel distance is L, then (A /H+
The cargo handling capacity can be increased by 2B/L + 2AB/H・L). The left side of FIG. 6 is the conventional one, and the right side is the one of this invention.

Since this invention is constructed as described above, it has the following effects.

Although it has an extremely simple configuration with a single hoisting machine and a parallel link mechanism interposed between the saddle and the crane girder, it can handle a cargo that is larger than the conventional cargo handling capacity. Since it is a machine, it can be worked without rehanging, improving work efficiency.

Compared to conventional models, the travel distance is smaller, so there is no need to suspend it horizontally using a hoist.
The life of the hoist can be extended and safety can be improved.

Due to the mutual displacement between the saddle and the girder, no torsional moment acts on the girder itself. For this reason, the girder itself does not require great strength.

The overall length of the wheel base can also be kept to the minimum required length.

As a result, the site within the factory building can be utilized to the maximum extent possible, which is extremely effective in cargo handling operations in warehouses and the like.

Furthermore, it can be easily installed on existing overhead cranes through additional engineering.

[Brief explanation of the drawing]

Figure 1 is a front view of the main parts of a conventional overhead crane.
Figure 2 is a right side view of Figure 1, Figure 3 is a front view of the main parts of the overhead crane according to this invention, and Figure 4 is the
FIG. 5 is an explanatory view showing the cargo handling capacity of the device of this invention and the conventional device, and FIG. 6 is a front view comparing the device of this invention and the conventional device. 1...Factory inner wall, 2...Bracket, 3...
Runway girder, 4... Traveling rail, 5... Overhead crane, 6... Saddle, 7... Running wheel, 8
... Crane girder, 10 ... Electric hoist, 1
4...Hook, 15...Arm, 16,17...
Shaft, 18...Parallel link, 19...Hydraulic cylinder.

Claims (1)

[Scope of utility model registration request] In an overhead crane that has one hoisting machine that travels via traveling wheels on a traveling rail provided on the upper part of the inside wall of the factory, the wheels on the saddle are placed between the bottom surface of both ends of the crane girder and the top surface of the saddle. A parallel link mechanism is interposed in which the center of the end of the crane girder rotates on a locus that draws an arc with respect to the traveling direction of the overhead crane with respect to the center of the base, and between the intermediate part of the parallel link mechanism and both ends of the saddle. An overhead crane characterized by having a hydraulic cylinder pivotally attached to the.