JP2001048465A - Wheel for crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To travel a crane while safety is secured by forming a large number of slit grooves extending in the direction crossing the rolling direction of a wheel in the outer peripheral surface of an outer wheel. SOLUTION: This running wheel 1 is formed by mounting an outer wheel 3 made of synthetic resin on a metallic inner wheel, and a gear 1 for receiving driving force from a traveling motor inside in which a crane girder constructed in a saddle is extended is integrally formed with the inner wheel 4. Slits 8 extending in the direction orthogonal to the rolling direction of the traveling wheel 1 are cut at equal spaces in the outer wheel 3 made of urethane rubber. Thus, the frictional force of the wheel to a runway girder is increased and influence of an oil film deposited on the runway girder can be restrained to reduce the slipping risk of the traveling wheel. Thus, safe running of the crane can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a traveling wheel or a traversing wheel for a crane having an outer ring made of an elastic body for the purpose of low vibration and low noise.

[0002]

2. Description of the Related Art In recent years, traveling wheels for cranes equipped with an outer ring made of an elastic body (for example, synthetic resin such as polyurethane, natural or synthetic rubber, etc.) have been widely used for the purpose of low vibration and low noise. The traveling wheels are used in a so-called railless crane (see FIG. 5) in which the H-shaped steel and the grooved steel constituting the runway girder are used as traveling rails as they are. In the conventional rail crane, a traveling rail is laid on a runway girder with a hook bolt or the like, and a metal traveling wheel travels directly on the traveling rail. . Therefore, in the railless crane, the running rail was removed, and an outer ring made of an elastic body was attached to the metal running wheel (inner ring) to suppress vibration and noise.

[0003]

A number of railless cranes have been introduced into general warehouses and factories, and there is no particular problem with running wheels having outer rings made of the above-mentioned elastic body.
The purpose of suppressing vibration and noise is achieved well. However, in a machining factory equipped with a large number of machine tools, although there was no problem at first when a new building was built and a crane was introduced,
Around two years have passed, the problem of running wheels slipping has been scattered. This is a problem in that cutting oil frequently used in machine tools is trapped in a building as oil smoke (oil mist), and the running wheels slip due to an oil film formed by accumulation of oil on the runway girder. For this reason, in the machining factory, it is necessary to periodically clean the runway girder (wiping off oil with a rag or the like) over the entire length of the runway girder.

[0004] The slip of the traveling wheels not only hinders the starting of the crane, but also causes a problem of meandering during traveling of the crane, and also has a considerable effect on the reduction in safety.
Since the effect (low vibration, low noise) of the outer ring made of the elastic body is preferable, it is desirable to avoid the influence of oil while using the outer ring of the elastic body if possible. Therefore, investigations were made to improve the crane's traveling while ensuring safety without being affected by the oil film deposited on the runway girder, and to remove oil if possible.

[0005]

SUMMARY OF THE INVENTION As a result of the study, a crane wheel equipped with an outer ring made of an elastic body for the purpose of low vibration and low noise has been developed in a direction transverse to the rolling direction of the wheel. This is a crane wheel in which a number of extending slit grooves are formed on the outer peripheral surface of the outer ring. The present invention is applicable not only to crane traveling wheels but also to crane traversing wheels (wheels for hoist crane girder) equipped with an outer ring made of an elastic body. The elastic body referred to herein is a material having a property capable of compressing and restoring under heavy load, and is mainly made of a synthetic resin such as polyurethane or a natural or synthetic rubber.

For example, when a running wheel having a slit groove formed thereon rolls on a runway girder having an oil film formed on an upper surface, oil is accumulated in the slit groove while removing the oil film by shaving the oil film at the slit groove edge. Go. Then, the oil stored in the slit groove is discharged to the outside of the traveling wheel. A stronger external force acts on the traveling wheels of the crane than on the outside due to the bending of the crane girder supporting the hoist, and the inside is strongly pressed against the runway girder. For this reason, since the inside pressure of the slit groove is high and the pressure decreases toward the outside, the oil is guided from the inside to the outside, and is excluded from the end of the slit groove to the outside of the traveling wheel. It is.

As described above, when the present invention is applied to a traveling wheel, the oil film is scraped off by the edge of the slit groove.
Since oil is discharged from the slit groove by a pressure difference utilizing characteristics of the crane, the extending direction of the slit groove is preferably as perpendicular to the rolling direction of the traveling wheel as possible. Normal,
Since the traveling wheel moves forward and backward, the slit groove extends in a direction perpendicular to the rolling direction of the traveling wheel. However, as long as the pressure difference between the inside and outside can be used, the extending direction of the slit groove may be a direction inclined with respect to the rolling direction of the traveling wheel.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a traveling wheel 1 for a crane to which the present invention is applied, and FIG.
FIG. 3 is a side view of the traveling wheel 1, FIG. 4 is a front view corresponding to FIG. 1 of another example of the traveling wheel 1, and FIG. 5 is a railless type to which the present example is applied. FIG. 2 is a perspective view showing the appearance of the crane. This example is an example in which the outer ring 3 made of a synthetic resin such as polyurethane is mounted on the traveling wheel 1 with a railless crane as shown in FIG.
Although the present invention can be applied to the traversing wheels 11, this embodiment will be described by taking the traveling wheel 1 as an example.

As shown in FIGS. 1 to 3, the traveling wheel 1 has a structure in which an outer ring 3 made of a synthetic resin such as polyurethane is mounted on a metal inner ring 4, and a crane girder 5 (see FIG. A gear 7 that receives a driving force from the traveling motor 6 is formed integrally with the inner race 4 inside the extension of the inner ring 4. In the outer ring 3 made of urethane rubber, slit grooves 8 extending in a direction perpendicular to the rolling direction of the traveling wheel 1 are formed at regular intervals. The width, depth and cross-sectional shape of the slit groove 8 are free. In this example, linear slit grooves 8 having a width of 5 mm and a depth of 3 mm are measured at intervals of 10 degrees for a traveling wheel 1 having an outer diameter of 220 mm.
36 are provided.

The extending form of the slit groove is also free and may be slightly meandering. However, for the purpose of collecting and discharging oil on the runway girder 9 which is the object of the present invention,
Straight slit grooves 8 are preferred. Further, by forming the linear slit grooves 8 as in this example, there is an advantage that the slit grooves 8 can be easily engraved on the outer ring 3 integrally formed in advance by post-processing. In addition to this example, for example, as shown in FIG.
It may be a slit groove 10 inclined in the rolling direction of the traveling wheel 1. In the example of FIG. 4, the width and the depth of the slit groove 11 are as shown in FIG.
It is the same as the following example.

The traveling wheel 1 of the present invention has a slit groove 8 (11).
Not only directly increases the frictional force against the runway girder 9, but also as shown in FIG. 2, the oil deposited on the runway girder 9 is scraped off by the slit groove 8 (11) while the oil in the slit groove 8 (11) The oil film in the slit groove 8 is discharged to the outside by the pressure difference between the inside and outside due to the deformation of the outer ring 3, thereby removing the oil film on the runway girder 9 that induces slip. As a result, not only slippage at the time of starting the crane, but also dangerous meandering of the crane can be prevented, safety is enhanced, and the frequency of cleaning of the oil film on the runway girder and the labor for cleaning are reduced.

[0012]

The effects obtained by the present invention can be summarized as follows for running wheels. First, the frictional force of the wheel with respect to the runway girder is increased by the slit groove provided in the outer ring, and the influence of the oil film deposited on the runway girder is suppressed to reduce the possibility that the traveling wheel slips.
Achieve safe crane travel.

Second, since the slit groove collects the oil and discharges the oil from the slit groove to the outside of the traveling wheel, the frequency of cleaning the runway girder can be greatly reduced. This also means that the amount of the oil film deposited on the runway girder is reduced, and the effect of reducing the slip is further ensured.

The collection and discharge of oil by the slit groove
The fact that the outer ring is constituted by an elastic body that can be slightly deformed is used. That is, the inner side of the outer ring is more compressed due to the bending of the crane girder, and this compression pushes the oil accumulated in the slit groove outward. Since the extruded oil basically adheres to the side surface of the traveling wheel, it is only necessary to wipe off the side surface of the traveling wheel as compared with the related art in which the entire runway girder has to be cleaned.
As described above, the present invention also has an effect of greatly reducing the labor of cleaning itself.

[Brief description of the drawings]

FIG. 1 is a front view of a traveling wheel for a crane to which the present invention is applied.

FIG. 2 is a cross-sectional view of the saddle with the traveling wheel attached.

FIG. 3 is a side view of the traveling wheel.

FIG. 4 is a front view corresponding to FIG. 1 of another example of a traveling wheel for a crane.

FIG. 5 is a perspective view showing the appearance of a railless crane to which this example is applied.

[Explanation of symbols]

 Reference Signs List 1 traveling wheel for crane 2 saddle 3 outer ring 4 metal inner ring 5 crane girder 6 traveling motor 7 gear 8 slit groove 9 runway girder 10 inclined slit groove 11 traversing wheel

Claims (1)

[Claims] 1. A crane wheel equipped with an outer ring made of an elastic body for the purpose of low vibration and low noise, wherein a number of slit grooves extending in a direction transverse to a rolling direction of the wheel are provided on an outer peripheral surface of the outer ring. A crane wheel characterized in that it is formed.