JPS6181355A - Magnet rail for belt conveyer provided with permanent magnet and electromagnet - Google Patents

Abstract

PURPOSE:To enable operational cost to be reduced by saving man-hour, by replacing a part of the electromagnetic unit of a belt conveyer with a permanent magnet or installing a permanent magnet in addition thereto. CONSTITUTION:A permanent magnet 12 is installed in a magnet container 11, each one of electromagnets 13, 13' is arranged on both ends of the permanent magnet 12 respectively and fixed to the magnet contained 11 and polarilies of the permanent magnet 12 and electromagnets 13, 13' are so arranged as to be similar to each other with regard to the linear part 9a of the belt. Accordingly, when a metal strip 14 is transported in the direction of an arrow mark 15 and function of the electromagnet 13 is disconnected when the strip comes to this position, the attractive force of the metal strip 14 to the belt is lost and it falls down from the belt with its own weight. Since only both ends of a belt conveyer where cargos are transferred and equipped with electromagnets and the rest of it is covered with only permanent magnet, smaller power consumption for the electromagnets can cause power saving operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic rail for a belt conveyor that includes a permanent magnet and an electromagnet.

2. Description of the Related Art A rail for a belt conveyor used for conveying metal pieces, particularly thin steel plates, etc., is known in which electromagnets are used to generate adhesion of the metal pieces to the belt surface. At this time, a plurality of electromagnet units made of electromagnets are arranged on the inner rail of the linear portion of the endless belt that is wound between the booms.

Power is supplied to each electromagnet unit, and the power is cut off at the required work timing. A large amount of electric power is required to supply power to a large number of electromagnetic units arranged along the straight line portion of the endless belt, which incurs a large operating cost.

The object of the invention is to provide a belt conveyor rail of the type mentioned at the outset, which results in power savings and therefore reduced operating costs.

The object of the present invention is achieved in a previously known belt conveyor of the type described above, by replacing a part of the electromagnetic unit with a permanent magnet or by providing a permanent magnet in addition to the electromagnetic unit. The present invention can be used not only with belt conveyors but also with all conveyance methods such as chain conveyors.

Embodiments of the present invention will be described in detail based on the drawings. 1st a
According to the figures and Fig. 1b, a mounting seat 2 is attached to a frame 1 of the belt conveyor, and brackets 3 and 4 are fixed to the lower surface of both end ranges of the frame 1. A shaft 5 and a driven shaft 6 are rotatably supported. 5' indicates the drive shaft neck. Pulleys 7.8 are fixed to the drive shaft 5 and the driven shaft 6, respectively. An endless belt 9 is wound around two pulleys 7.8. 9a indicates a lower straight portion of the endless belt 9 wound around it.

A platen (10.10) is fixed to the lower surface of the frame 1, and a magnet housing portion (11) is attached over the lower end of the platen (10.10).

In the magnet accommodating part 11, a permanent magnet 12 and a permanent magnet 120 are provided with electromagnets 15.1'5' at both ends thereof, and are fixed to the magnet accommodating part 11.

The polarities of the permanent magnet 12 and the electromagnets 13, 15' are arranged to be the same with respect to the straight portion 9 of the belt, so that when the permanent magnet 12 has eight poles, the electromagnet 13 also has an S pole.

As a result, when the metal piece 14 is conveyed in the direction of the arrow 15, if the electromagnet 13 is cut off at the position of the electromagnet 13, the adsorption force of the metal piece 14 to the belt is lost, and the metal piece 14 is swung by its own weight. fall from

In this embodiment, electromagnets are installed only in the transfer range of the conveyed objects at both ends of the belt conveyor, and only permanent magnets are installed in other parts, so the power consumption of the electromagnets is reduced. is small, and low power operation can be obtained.

2a and 2b schematically show another embodiment of the belt conveyor according to the invention. Both pulleys 21.
An endless conveyor belt 23 is wound between the belts 22 and 22. 24 is a magnet housing plate fixed to a conveyor frame (not shown), and 23 is a magnet pair. Each magnet pair 23 consists of a permanent magnet 26 and an electromagnet 27 fixed to a magnet housing plate 24. The electromagnet 27 is located outside the permanent magnet 26, and the polarities of the magnets are different from each other.

In FIG. 2b, if there is a lower linear portion 23a of the endless conveyor belt 23 around which the lower surface is wrapped, then for example, eight poles of the permanent magnet 26 and an N pole of the electromagnet 27 are generated for this linear portion 23a. can be placed in

As a result, by energizing the electromagnet 27 while leaving the action of the permanent magnet unchanged at any location of the magnet unit, the conveyed object 28 whose attraction force to the belt surface is reduced at a predetermined location is placed in the discharge case 29. or stack 3
It will start to fall due to its own weight.

According to the present invention, only a permanent magnet is placed in an unnecessary range of 0IPIF when the magnetic force is turned on in a belt competition rail using magnets, or when the magnet is turned on in a magnet unit consisting of a pair of permanent magnets and electromagnets. By not energizing the electromagnet in an unnecessary range of OFF, the operating power for the rail for this type of belt conveyor can be reduced.

[Brief explanation of drawings]

Fig. 1a is a front view of a first embodiment of a magnetic rail for a belt conveyor according to the present invention, Fig. 1b is a side view thereof, Fig. 2a is a front view of the second embodiment, and Fig. 2b is a magnet unit. Figure 3 shows a schematic cross-sectional view. 23... Conveyor belt 9a; 23a... Straight section of belt 11; 24... Frame 12; 26... Permanent magnet 13; 27... Electromagnet 14; 28... Covered Conveyance member

Claims (3)

[Claims] (1) An endless belt (9;
It is equipped with a permanent magnet (12; 26) and an electromagnet (13; 27) attached to a stationary frame (11; 24) inside the belt along the straight line portion (9a; 23a) of the belt. A magnetic rail for a belt conveyor, characterized in that the attraction force of the conveyed member (14; 28) to the surface of the conveyor belt is lost or weakened by demagnetizing or excitation of the conveyor belt surface (14; 28). (2) A claim in which the permanent magnet (12) and the electromagnet (13) are arranged one behind the other in the conveying direction (15) over the inside of the straight portion (9a) of the conveyor belt around which the permanent magnet (12) and the electromagnet (13) are wound. The magnetic rail for belt conveyor described in item 1. (3) A patent claim in which a permanent magnet (26) and an electromagnet (27) are arranged so as to overlap each other in a direction substantially perpendicular to the conveying direction (31) inside the straight portion (23a) of the conveyor belt around which the permanent magnet (26) and the electromagnet (27) are wound. Magnetic rail for belt conveyor as described in scope 1.