JPH06312820A - Pulley for stretching endless belt - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to prevent the endless belt from deviating even when the axis of the endless belt passing pulley is tilted from the state where the endless belt is orthogonal to the endless belt. Provided is a pulley for looping around an endless belt, which does not require fine adjustment to make the endless belt and the endless belt orthogonal to each other. [Construction] A motor is housed in an inner drum 21 made of steel. The rotating shaft 4 of this motor projects from both ends of the inner drum 21 and is fixed to the fixing member 10. An elastic body 22 made of rubber is provided on the outer peripheral surface of the inner drum 21. The inner peripheral surface of the outer drum 23 made of steel is in contact with the elastic body 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endless belt passing pulley used for a belt conveyor or the like, and more particularly to an endless belt passing pulley which prevents the belt from being biased.

[0002]

2. Description of the Related Art A belt conveyor is shown in FIGS. In the figure, reference numeral 1 indicates a frame, a motor pulley 2 is attached to one end of the frame 1, and a driven pulley 3 is attached to the other end. An endless belt 5 is stretched around the motor pulley 2 and the driven pulley 3. Reference numeral 7 indicates an inclined roller, which is attached to a fixing member (not shown) fixed to the frame 1. A plurality of inclined rollers 7 are provided, one pair being one set, and are arranged so as to incline toward the sides facing each other. The inclined roller 7 is in contact with the back surface of the endless belt 5 which is driven leftward on the paper surface. Therefore, the endless belt 5 that is driven leftward in the drawing is inclined from both sides toward the center.

Reference numeral 8 indicates a guide roller, and the guide roller 8 is in contact with the surface of the endless belt 5 which is driven rightward on the paper surface. The motor pulley 2 has a diameter that gradually decreases toward the center and is formed in a substantially drum shape. A motor is housed and fixed in the motor pulley 2. The rotary shaft 4 of this motor projects to both sides of the motor pulley 2. The rotating shaft 4 of the motor is fixed to a fixing member 10. The fixing member 10 is attached to the frame 1 and slightly operates when the adjusting screw 11 is turned to finely adjust the tilt angle of the axis T of the motor pulley 2. it can.

When the motor accommodated in the motor pulley 2 drives this belt conveyor, the motor rotation shaft 4 is fixed to the fixing member 10, so that the motor pulley 2 rotates counterclockwise. Then, the endless belt 5 is driven as shown by the arrow, and the conveyed product on the endless belt 5 is carried.

In the above operation, if the axis T of the motor pulley 2 and the endless belt 5 are not orthogonal to each other, the endless belt 5 will be offset. For example, as shown in FIG. 7, when the axis T falls to the state shown by the chain double-dashed line, the endless belt 5 shifts to the right side of the paper (the direction shown by the chain double-dashed line arrow). If the endless belt 5 is offset, the end of the endless belt 5 on the offset side is slidably contacted with the frame 1 or the like, or damaged.
There is a possibility that the conveyed product on the endless belt 5 may fall. Therefore, as described above, the motor pulley 2 is formed into a substantially drum shape, or the adjusting screw 11 is rotated so that the shaft center T and the endless belt 5 are orthogonal to each other.

[0006]

However, when the endless belt 5 is driven, a considerably large force is applied to the motor pulley 2, so that the position of the fixing member 10 is displaced,
There is a possibility that the shaft center T of the motor pulley 2 may fall from a state orthogonal to the endless belt 5 and the endless belt 5 may be biased. Further, it is difficult to adjust the shaft center T and the endless belt 5 so as to be completely orthogonal to each other by the adjusting screw 11, and it requires considerable skill.

The present invention has been made in view of the above-mentioned problems of the prior art. Even if the endless belt passing pulley used for a belt conveyor or the like has its axis centered perpendicularly to the endless belt, the endless belt is It is an object of the present invention to provide an endless belt passing pulley which can prevent deviation and does not require fine adjustment for making the axis of the endless belt passing pulley orthogonal to the endless belt.

[0008]

According to a first aspect of the present invention, an inner drum made of a hard material is rotatably supported by a frame,
It is composed of an elastic body provided on the outer peripheral surface of the inner drum, and an outer drum made of a hard material in which the inner drum is fitted and the inner peripheral surface contacts the elastic body, and an endless belt is hung on the outer peripheral surface. It is a pulley for endless belts.

[0009]

According to the present invention, if the contact pressure between the endless belt and the outer drum becomes non-uniform due to the axial center of the endless belt spanning pulley being tilted from the state where it is orthogonal to the endless belt, it corresponds to the portion where the contact pressure is high. The elastic body is compressed strongly. Therefore, the outer drum approaches the inner drum as much as the elastic body is compressed, and the contact portion between the endless belt and the outer drum is maintained in the same state as the state where the axis of the endless belt passing pulley is orthogonal to the endless belt. become.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings of FIGS. Reference numeral 20 indicates a motor pulley as an endless belt passing pulley. Since this motor pulley 20 is mounted on a belt conveyor similar to the belt conveyor on which the motor pulley 2 according to the conventional example is mounted, the description of members constituting the belt conveyor other than the motor pulley 20 will be omitted, and the same as the conventional example. The member names and symbols of will be described.

Reference numeral 21 denotes an inner drum made of steel, and a motor is housed in the inner drum 21. The rotating shaft 4 of this motor projects from both ends of the inner drum 21 and is fixed to the fixing member 10. An elastic body 22 made of rubber is provided on the outer peripheral surface of the inner drum 21.
Is provided. Reference numeral 23 indicates an outer drum made of steel material, and the inner drum 2 is attached to the outer drum 23.
1 is fitted, and the inner peripheral surface of the outer drum 23 is an elastic body 2
Touching 2. That is, the elastic body 22 is filled in the gap between the inner drum 21 and the outer drum 23. The outer drum 23 has a diameter that gradually decreases toward the center and is formed in a substantially drum shape. Further, the inner peripheral surface of the outer drum 23 has six rims 23a.
And a cooling hole 23b is formed on the inner peripheral surface of the outer drum 23.

Next, the motor pulley 20 is connected to the endless belt 5.
The operation for preventing the deviation of the above will be described. In the state where the axis T is indicated by the alternate long and short dash line, the contact pressure between the endless belt 5 and the outer drum 23 in the contact area 20a on the left side of the paper is equal to the contact pressure in the contact area 20b on the right side of the paper. Therefore, as shown in FIG. 4, the elastic body 22 in the portions corresponding to both the contact area 20a and the contact area 20b is in a uniformly compressed state.

When the axis T is tilted to the state shown by the chain double-dashed line, the motor pulley 20 is tilted leftward and rightward with respect to the paper surface. Therefore, the contact pressure between the endless belt 5 and the outer drum 23 in the contact area 20a increases, and the contact pressure between the endless belt 5 and the outer drum 23 in the contact area 20b decreases. Therefore, as shown in FIG. 5, the elastic body 22 in the portion corresponding to the contact area 20a is compressed more strongly than the portion corresponding to the contact area 20b, and the elastic body 22 is strongly compressed in the contact area 20a. Approaches the inner drum 21. Therefore, the contact portion between the endless belt 5 and the outer drum 23 is maintained in the same manner as the state in which the axis T indicated by the alternate long and short dash line is orthogonal to the endless belt 5, and the endless belt 5 can be prevented from shifting. .

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and the present invention is applicable even if there is a design change or the like without departing from the scope of the present invention. Included in the invention. For example, although the motor pulley for the belt conveyor is shown in the above embodiment, the endless belt passing pulley of the present invention may be used as a power transmission pulley other than the motor pulley. Further, it can be applied not only to a motor pulley having a driving force but also to a driven pulley in which power is transmitted by an endless belt and is driven. Further, the elastic body 23 of the present invention may be made of rubber or a material having elasticity such as silicon resin. Although the outer drum 23 has a substantially drum shape, it is also possible to use a cylindrical drum having a constant diameter in the axial direction.

[0015]

As described above, according to the present invention, it is possible to prevent the endless belt from deviating even when the axis of the endless belt passing pulley falls from a state where the endless belt is orthogonal to the endless belt. . Further, fine adjustment for making the shaft center of the endless belt passing pulley and the endless belt orthogonal can be unnecessary.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a motor pulley according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the motor pulley according to the embodiment of the present invention.

FIG. 3 is a plan view for explaining the operation of the motor pulley according to the embodiment of the present invention for preventing the endless belt from being offset.

FIG. 4 is a partial cross-sectional view of a motor pulley for explaining the operation of preventing the endless belt according to the embodiment of the present invention from being offset.

FIG. 5 is a partial cross-sectional view of a motor pulley for explaining the operation of preventing the endless belt from shifting to one side according to the embodiment of the present invention.

FIG. 6 is a side view of a belt conveyor.

FIG. 7 is a plan view for explaining a problem of a motor pulley according to a conventional example.

[Explanation of symbols]

 5 Endless Belt 20 Motor Pulley 21 Inner Drum 22 Elastic Body 23 Outer Drum

Claims (1)

[Claims] 1. An inner drum made of a hard material that is rotatably supported by a frame, an elastic body provided on an outer peripheral surface of the inner drum, and an inner peripheral surface fitted to the elastic body. A pulley for endless belt passing, which is in contact with and has an outer drum made of a hard material on which the endless belt is hung on the outer peripheral surface.