JPS61114915A - Belt conveyer apparatus - Google Patents

Abstract

PURPOSE:To reduce the power and to lessen the tension of a belt by arranging stoppers thinner than slide plates in the belt moving direction on the support surface of the belt, thereby to displace the slide plates between the stoppers in a belt conveyer apparatus with a slide plate. CONSTITUTION:When a belt 3 starts to move, slide plates 9 are displaced on a support surface 2 having a small coefficient of friction with the belt 3 having a large coefficient of friction with the slide plates 9. At that time, the frictional force acting upon the belt 3 is smaller than the frictional force produced by the belt 3 starting to move on the slide plates 9. Accordingly, the starting power of a conveyer is lessened, and the tension acting upon the belt 3 is reduced. When the slide plates 9 are displaced by a distance L, the slide plates 9 are brought into contact with the stopper 10 to be stopped. At this time, the belt 3 is decreased in speed to a certain degree, so that the belt tension is reduced until the steady state. Thus, the power and belt tension can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a belt conveyor device, and more particularly to a held conveyor device equipped with a slide plate that is displaced as the belt moves. This is used in the field of conveyor belts for transporting heavy objects.

[Prior art]

In a belt conveyor that transports a heavy object by placing it on a bear L/l-, a support surface is formed under the belt because it is necessary to support the weight. In the type where the belt reciprocates, the supporting surface is, for example, the floor surface of the vehicle on which the belt is installed, and in the type where the belt moves back and forth, the supporting surface is the top surface of a frame provided on the return side in the type where the belt rotates. However, when the belt is placed on the support surface, the sliding area between the two becomes large, and there are limitations on the selection of materials for the heald and the material that forms the support surface, so it is difficult to reduce the frictional force when the belt moves. Not easy to reduce. Therefore, in the past, a discontinuous slide plate was fixed on the support surface to reduce the degree of contact with the belt. We use small ones. As a result, the frictional force acting on the heald is reduced and a large weight can be supported via the slide plate.

By the way, it is known that the frictional force that acts when moving the heald differs greatly between when the heald starts moving and during the movement, and is larger during the former. This is based on the fact that the coefficient of static friction is generally larger than the coefficient of kinetic friction for the same object, and as shown by line A in Figure 3, the heald The tension acting on is initially large and immediately decreases rapidly,
After that, it gradually decreases and then becomes constant at a certain value. As a result, a large amount of power is required to start the conveyor, and an uneconomical drive source having a capacity larger than the power required during steady operation must be used as a driving electric motor or the like. In addition, the belt is required to be strong enough to withstand the initial high tension, and problems remain in making the entire hair-conhair device smaller, lighter, and more power-saving.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and its purpose is to reduce the power required for the conhair drive, especially at the time of starting, and to reduce the excessive tension that acts on the belt at that time. Another object of the present invention is to provide a sliding plate supported type heel converter device that can reduce the capacity of a drive source and reduce the strength of a belt.

[Structure of the invention]

The features of the heel conveyor device of the present invention will be explained with reference to FIG. In this device, stoppers 10 that are thinner than a slide plate 9 are arranged and fixed on a support surface 2 in the moving direction of the belt 3, and a slide plate 9 whose coefficient of friction with the support surface 2 is smaller than that with the belt 3. , and is disposed displaceably between the stoppers 10.

[For production]

When the belt begins to move, the slide plate is displaced along with the belt having a large friction coefficient on a support surface that has a small friction coefficient with the slide plate. As the belt moves, the frictional force between the slide plate and the support surface decreases. When the slide plate comes into contact with the stopper and stops, the belt and the slide plate slip and a frictional force is generated, but since the belt already has a certain speed, the belt speed is lower than when the belt starts moving on a stationary slide plate. The frictional force acting on becomes smaller.

Therefore, the power required and the tension applied to the belt during the process from the start of the belt movement until it reaches a steady speed can be smaller than when the slide plate is fixed.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples thereof.

FIG. 1 is an enlarged schematic view of the main parts of a belt conveyor device, in which a conveyor heald 3 moves on a support surface 2, which is a floor surface attached to a frame 1 of a vehicle body. This is applied, for example, to a truck 4 as shown in FIG.
The belt 3 is stretched across the rollers, and electric motors 7 and 8 are attached to each roller to cause the belt 3 to reciprocate.

As shown in FIG. 1, a slide plate 9 is provided on the support surface 2, and the belt 3 is moved while sliding on the upper surface of the slide plate 9. However, a large number of stoppers 0, which are thinner than the slide plate 9, They are arranged in the moving direction of the belt 3 and fixed to the support surface 2 by a securing member (not shown).

A slide plate 9 is movably interposed between these stoppers 10 with a gap left, and when the slide plate 9, which is displaced as the belt 3 moves, comes into contact with the stopper 10, the slide plate 9 can no longer be moved. 9 is designed to prevent displacement.

By the way, since the belt 3 is wound around the rollers as described above, it is required to have a certain degree of flexibility and strength and rigidity that can handle the weight of the conveyed object, so its material is limited to rubber-based materials. There are many cases.

Therefore, there is a limit to reducing the coefficient of friction between the heald 3 and the slide plate 9. Therefore, the slide plate 9 is movable as described above, and is made of a resin material, such as polypropylene, whose coefficient of friction with the support surface 2 is smaller than that with the belt 3. The coefficient of friction with the iron plate forming the support surface 2 can be set to, for example, about 0.2, which is smaller than the coefficient of friction with rubber. In addition, the stopper 10
Although the slide plates 9 and the slide plates 9 do not necessarily have to be arranged alternately, since a heavy object is placed on the heald 3, it is desirable that the slide plates 9 that receive the load are arranged at a certain interval. Of course, the number of slide plates 9 does not have to be large, and one plate close to the length of the conveyor can be used, and there is no restriction on the number of slide plates 9.

According to an embodiment with such a configuration, as follows,
The frictional force acting on the belt 3 when starting the conhair can be reduced. When the belt 3 starts to move, the slide plate 9 is displaced on the support surface 2 having a small friction coefficient as the belt 3 has a large friction coefficient with the slide plate 9. At this time, the frictional force acting on the belt 3 becomes smaller than when the belt 3 starts moving on the slide plate 9. As a result, the power required to start the conveyor is reduced, and the tension acting on the belt 3 at this time does not increase. As the slide plate 9 moves on the support surface 2, the frictional force further decreases, but when the slide plate 9 moves through the gap, it comes into contact with the stopper 10 and stops. The belt 3 begins to slide on the slide plate 9, but since the belt 3 already has a certain speed, the frictional force generated between the belt 3 and the slide plate 9
This value is smaller than that when the belt 3 starts moving while both the belt 3 and the sliding plate 9 are in a stationary state, and the belt tension until reaching a steady speed is as shown by line B in FIG. 3. In other words, the change is almost the same as if the original section G of line A was removed.

Note that when the drive of the roller that winds up the belt 3 changes to the other side, the moving direction of the belt is reversed, so each time the slide plate separates from the stopper and comes into contact with another stopper, and as described above, the slide plate moves away from the stopper and comes into contact with another stopper. works. In addition, even if the belt is stretched endlessly around the roller, if the direction of movement of the belt is reversible, a stand corresponding to the above-mentioned support surface should be installed above the return side. By providing this, similar operations can be performed. Of course, the installation of such a conveyor device can be applied not only to vehicle bodies but also to equipment that requires transportation, and the objects to be transported are not limited to heavy objects.

Further, by selecting the material of the slide plate and its surface roughness, the coefficient of friction between the belt and the support surface can be made smaller, and the frictional force can be more effectively reduced.

〔Effect of the invention〕

As can be seen from the description of the embodiments above, the present invention has a stopper fixed on the support surface, and a slide plate movably provided between which the friction coefficient with the support surface is smaller than the friction coefficient with the belt. Even if there are restrictions on the selection of the material of the conveyor, by selecting the slide plate, the power required to start the conveyor can be reduced and the capacity of the drive source can be reduced. Moreover, the tension acting on the heald is also reduced, making it possible to reduce the weight of the belt and prevent excessive quality of its strength and l'llj properties.

[Brief explanation of drawings]

Fig. 1 is an enlarged schematic sectional view of the main parts of the heald conveyor device, Fig. 2 is a front view of an example in which the present invention is applied to a freight vehicle, and Fig. 3
The figure is a graph showing the change in belt tension after the conveyor is started. 2-support surface, 3-belt, 5.6-roller, 9-slide plate, lO-stopper.

Claims (1)

[Claims] (1) In a conveyor device in which a belt stretched around rollers moves while sliding on a slide plate arranged on a support surface, stoppers thinner than the slide plate are arranged on the support surface in the direction of movement of the belt. A belt conveyor device, characterized in that a slide plate is movably interposed between the stoppers and is fixed to the stopper and has a coefficient of friction with the support surface smaller than a coefficient of friction with the belt.