JPS5932366B2 - Belt drive device using linear motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a belt drive device using a linear motor for driving a belt in a belt conveyor or other belt-using device.

Conventionally, as a bell drive device for a belt conveyor, as shown in FIG.
1 is commonly used.

However, in this type of belt drive device, once the rotation speed of the prime mover 10, the reduction ratio of the reducer 11, and the diameter of the pulley 9 are determined, the speed of the endless belt 1 is determined, so it is difficult to change the speed of the endless belt. Out.

In addition, the pulley 9 is
Since rotational force is transmitted to the reducer 9, it is necessary to maintain and manage the reducer 9.

On the other hand, as a belt drive device, as shown in FIGS. 2 and 3, a disk 13 serving as a secondary conductor of a linear motor is attached to the shaft 12 of a single-hook pulley 9 that supports the reverse curved portion of the endless belt 1. The supporting frame 5 is fixed and supports the linear motor 8.
However, in the case of this type of linear motor type belt drive device, the outer diameter of the disc 13 becomes considerably large due to the pulley diameter, which poses a practical problem.

In other words, since the circumferential speed of the linear motor 8 is relatively high, it is necessary to use the ratio of the pulley diameter and disc diameter to match the belt speed, and therefore the disc diameter needs to be several times the pulley diameter. be.

The present invention advantageously solves the above-mentioned problems, and provides a belt drive device that can omit a speed reducer, change speed, and easily change the driving force of an endless belt. It is intended for the purpose of

Next, the present invention will be explained in detail using illustrated examples.

4 to 6 show an embodiment of the present invention, in which an endless belt 1 is attached to the end of the conveyor frame 14.
A plurality of drive rollers 3 and a plurality of auxiliary rollers 4 are fixed to support frames 5 on both sides in the width direction, and support the semi-curved portion of the endless belt 1 at the end of the conveyor. It is rotatably supported through.

There are grooves or protrusions 16 for preventing slipping on the circumferential surface of each drive roller 3.
Further, the belt contact portions of the drive roller 3 and the auxiliary roller 4 are arranged at intervals in the circumferential direction on a substantially semi-cylindrical surface.

! A disc 7 made of a steel-aluminum composite plate, which serves as a secondary conductor of each linear motor, is fixed to one end of the shaft 6 of the drive roller 3, and the linear motor 8 is supported on the inner and outer surfaces of each disc 7. It is fixed to the frame 5.

, the radius of the drive roller 3 is R1, the distance from the center of the drive roller 3 to the thrust generating part of the linear motor 8 is D, and when the linear motor 8 is excited, the radius of the drive roller 3 is tangential to the disk 7 (in the direction of arrow A or B). When configured to generate thrust, when the speed at the radial position on one disc 7 is VO, the circumferential speed V of the drive row 23 is expressed by: In other words, R/D speed change can be performed. .

Generally, the synchronous speed of a low-speed linear motor is 300 to 5
00 m/mvt, so the speed of endless belt 1 is 1
00 m/min, R/D may be set to 3 to 5, and the desired reduction ratio can be obtained using only the disc 7 and the drive roller 3.

The extreme rotational force is multiplied by the reciprocal of the reduction ratio D/R, as in the case of a general reduction gear.

By adjusting the distance of the linear motor 8 from the center of the drive roller 3, the circumferential speed of the drive roller 3 can be adjusted. If it is necessary to increase the force, increase the number of linear motors 8 installed opposite to one disc 7, or increase the number of drive rollers 3 installed at the reverse curved portion 2 of the endless belt 1.
All you have to do is increase the number of .

Further, by attaching disks 7 to both ends of the shaft of the drive roller 3 and arranging a linear motor 8 to each disk 7, the driving force of the drive roller 3 can be doubled.

Heat during driving is mainly generated in the disc 7;
Since it rotates in the atmosphere, it dissipates heat well.
Therefore, there is no need to install a cooling device.

Further, if it is necessary to cool the linear motor 8, a blower blade may be attached to the disc 7 to cool the linear motor 8 with air.

In order to adjust the distance between the axis of the drive roller 23 and the linear motor 8, for example, the mounting position of the linear motor can be changed by providing a large number of mounting bolt holes at different distances from the axis of the drive roller 3 in the support frame 5. Bye.

According to this invention, the plurality of drive rollers 3 and auxiliary rollers 4 that support the inverted curved portion 2 of the endless belt 1 are arranged so as to be lined up along a roughly semi-cylindrical surface, and are freely rotatable by the support frame 5. A disk 7 serving as a secondary conductor of the linear motor is fixed to the shaft 6 of each drive roller 3, and a linear motor 8 facing the disk 7 is attached to the support frame 5. It is possible to use a small-diameter disc 1, reduce the belt speed to an appropriate belt speed using a small and compact drive device, and drive the endless belt 1 without using a meshing type reduction mechanism such as gears. Therefore, effects such as the ability to omit the maintenance work of the reducer, which has conventionally been frequently performed, can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing an example of a conventional belt drive device, FIG. 2 is a front view showing an example of a belt drive device using a near motor, and FIG. 3 is a side view thereof. FIG. 4 is a side view showing a belt drive device using a linear motor according to the present invention, FIG. 5 is a front view thereof, and FIG. 6 is an explanatory diagram of the reduction ratio of the drive roller. In the figure, 1 is an endless belt, 2 is a reversing curved part, 3 is a drive roller, 4 is an auxiliary roller, 5 is a support frame, 6 is a shaft, 7 is a disc, 8 is a linear motor, 14 is a conveyor frame, and 15 is a It is a bearing.

Claims (1)

[Claims] 1 A plurality of drive rollers 3 and auxiliary rollers 4 that support the inverted curved portion 2 of the endless belt 1 are arranged so as to line up along a semi-cylindrical surface and are rotatably supported by a support frame 5, and A disk 7 serving as a secondary conductor of the linear motor is fixed to the shaft 6 of each drive roller 3, and the disk 7
A belt drive device using a linear motor, characterized in that a linear motor 8 facing the is attached to a support frame 5.