JPS63196403A - Braking device for roller conveyer - Google Patents

Abstract

PURPOSE:To improve durability and to keep a constant braking force by providing a braking member so as to do a relative motion with a magnetic flux of a permanent magnet cut, and linkaging one side of either the permanent magnet or the braking member with a roller main body. CONSTITUTION:A roller conveyer is formed by combining a braking roller BR integrated with a braking device BS and a roller not figured having no braking device and laid slantly. When carried goods pass on the braking roller BR, a roller main body RL1 rotates and also a permanent magnet 11 rotates via a york 12. On the other hand, a braking member 21 is immobile. Therefore, the member 21 crosses the magnetic flux of the magnet 11, an eddy current arises in the member 21, a braking force is generated between the member 21 and the magnet 11 and braked, and a carrying speed is controlled. This constitution enables the braking force to be kept constant and durability to be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a brake device for a roller conveyor used for regulating the conveyance speed of articles being conveyed in a roller conveyor for conveying articles.

BACKGROUND OF THE INVENTION In order to efficiently convey articles, roller conveyors are often used in which a large number of conveyor rollers are attached to a frame in the form of a ladder.

Such roller conveyors are constructed so that each conveyor roller moves smoothly via bearings, so unless a special braking force is applied to the conveyor rollers, the conveyance speed of the conveyed articles may be excessive. As a result, there is a risk that an excessive impact may be applied to the article at the final end, or that the article may fall off the conveyor and be damaged during conveyance.

As a way to deal with this problem, the maximum conveying speed of the articles to be conveyed can be increased by appropriately arranging brake rollers that are mixed with the conveyor rollers and configured to be able to apply an appropriate braking force. Conventionally known brake devices for this purpose include:
Mechanical brakes are common, in which a brake member is mechanically pressed and a braking force is applied by the frictional force acting between the two.

Problems to be Solved by the Invention According to such prior art, since the brake members wear out during use, it is difficult to maintain the generated braking force at a constant level, and the surface of the brake roller Since the brake member comes into sliding contact with the roller conveyor, there is a risk that the surface of the brake roller may be damaged, which inevitably leads to problems such as a risk that the life of the entire roller conveyor may be shortened.

In view of the problems of the prior art, an object of the present invention is to replace the mechanical brake using mechanical friction with a non-contact type eddy current brake as a mechanism for generating braking force, thereby improving the braking force of the brake member. Since there is no wear, the braking force can be kept constant, and since there is no mechanical contact between the brake member and the surface of the brake roller, there is no risk of damage to the surface of the brake roller, and therefore the roller conveyor An object of the present invention is to provide a new brake device for a roller conveyor that does not unduly shorten the life of the roller conveyor.゛Means for Solving the Problems The configuration of the present invention to achieve the above object includes a permanent magnet and a brake member that cuts the magnetic flux from the permanent magnet and relatively moves in the vicinity of the magnetic pole. The gist is that either the permanent magnet or the brake member is interlocked with the roller body.

With this configuration, when an article to be conveyed passes over the surface of the roller body and the roller body is rotated, either the permanent magnet or the brake member that is linked to the roller body rotates. Therefore, there is a relative movement between the two that causes the brake member to cut the magnetic flux from the permanent magnet, and therefore, a braking force is generated between the two based on the eddy current generated in the brake member. ,
The article receives this braking force from the roller body, and the conveyance speed of the article can be appropriately suppressed.

Example Examples will be described below with reference to the drawings.

The brake device 83 of the roller conveyor RC includes a permanent magnet 1
1 and a brake member 21 (FIG. 1), and is assembled into a roller main body RLI to form a brake roller BR (FIG. 3).

The permanent magnet 11 has magnetic poles N and S formed on the inner and outer circumferential surfaces of a disc-shaped disk having a through hole 11a in the center (Fig. 2), and a magnetic field of a predetermined strength can be obtained. The material does not matter as long as it can be used. The permanent magnet 11 has a cup-shaped yoke 12 formed so as to wrap around its outer peripheral surface from one end side.
(Fig. 1), and by connecting both with a spacer 13 and a bolt/nut 14, the permanent magnet 11
A magnetic circuit having a gap Ω is formed between the yoke 12 and the yoke 12, and the whole is inserted into the roller body RL1.

The brake member 2] has its tip inserted into the gap q created between the permanent magnet 11 and the yoke 12, and is held concentrically with the permanent magnet 11 by a spacer 22, a bearing 23, and a port 24. It is an octopus-shaped non-magnetic metal member.

The spacer 22 is a ring member that holds a bearing 23 inserted inside the roller body RL1, and the bolt 24 fixes these members to the frame F by screwing into the cap plate 25. There is.

Now, brake roller B incorporating brake device BS
A roller conveyor RC is formed by appropriately mixing rollers R and rollers FR without a brake device BS and disposing them in a ladder shape between frames F and F (FIG. 3).

Consider a case where a roller conveyor RC is installed at an angle, an article K is placed on it, and the article is conveyed by gravity (arrow A in the figure).

When the article K passes over the brake roller BR, the roller main body RL1 supported via the bearing 23 is rotated. Therefore, the yoke 12 inserted into the roller body RLI rotates, and therefore the permanent magnet 11 assembled integrally therewith also rotates.

On the other hand, since the brake member 21 is fixed to the frame F via the port 24, it does not rotate at all even when the roller main body RLI rotates. Therefore, the permanent magnet 11 and the brake member 21 move relative to each other. At this time, since the brake member 21 is inserted into the gap q of the magnetic circuit including the permanent magnet 11 and the yoke 12, the brake member 21 crosses the magnetic flux from the permanent magnet 11.

Therefore, an eddy current is generated inside the brake member 21, and a braking force based on this eddy current is generated between the brake member 21 and the permanent magnet 11, so that the roller body RLI receives the braking force.

Therefore, this braking force is applied to the article K, and the conveyance speed thereof can be effectively prevented from becoming excessive.

In another embodiment, the relative relationship between the permanent magnet 11 and the brake member 21 can be interchanged (FIG. 4). That is, here, the permanent magnet 11 has magnetic poles N and S formed on both end faces of a disk shape, and is entirely wrapped by the yoke 12 while leaving a gap q on the end face of one magnetic pole N. On the other hand, the brake member 21 is fixed to the frame F via a bolt 24, and the brake member 21 is formed into a disc shape, and the spacer 2
6 and a port nut 14, it is held in the gear q and inserted into the inner surface of the roller body RL1 so that it can rotate together with the roller body RLI. The roller main body RLI is rotatably supported by the frame F via a port 24, a spacer 22 that also serves as a cap plate, and a bearing 23. In this case, since the magnetic poles of the permanent magnet 11 can be formed on both end faces of the disk, it is easy to strongly magnetize the permanent magnet 11.

Roughly speaking, two permanent magnets 1 are placed on the inner surface of the roller body RL1.
1a and lla, and two disk-shaped yokes 12a and 1
2a and the bolt 24 may form a magnetic circuit (FIG. 5). At this time, the permanent magnets 11a, 11a are divided in the circumferential direction of the disk shape to form magnetic poles N, S, N, S, etc. (Fig. 6), and the different magnetic poles are divided into gaps q.
By arranging the gears so as to face each other with the gears q in between, a strong magnetic field can be created within the gear q.

In each of the above embodiments, the permanent magnet 11 may be a plurality of blocks arranged in a circular shape instead of a disk-shaped permanent magnet 11. It is assumed that the direction may be opposite to the direction shown.

The permanent magnet 11 and the brake member 21 are connected to the roller body RL.
It may be provided outside of I (FIG. 7). That is, a large-diameter disc-shaped brake member 21 is fixed to a spacer 22 for pivotally supporting the roller body RLI, and a combination of a block-shaped permanent magnet 11 and a yoke 12 is mounted on the frame F. A magnetic circuit is formed, and the peripheral edge of the brake member 21 passes through the gear q. Since the diameter of the brake member 21 can be increased, the traveling speed of the brake member 21 within the gear q can be increased, and therefore, it is possible to generate a stronger braking force.

Roughly speaking, the roller main body RLI and the brake member 21 are:
They can also be connected via a speed increasing mechanism 30 consisting of sprockets 31a, 31b and a chain 31c (FIG. 8). Since the rotational speed of the brake member 21 can be increased arbitrarily, it is convenient to increase or adjust the braking force.

In addition, when the brake device BS is incorporated into the roller main body RL1, the speed increasing mechanism 30 includes an internal gear 32a rotating together with the roller main body RLI, a sun gear 32b disposed at the center thereof, and both these gears. It is also possible to form a differential gear open groove formed by combining planetary gears 32G, 32C, . . . connecting planetary gears 32a, 32b (FIG. 9).

Here, the internal gear 32a is inserted into the roller main body RLI, and is also fixed to the inner surface of a cylindrical frame-shaped spacer 22 that is rotatable with respect to the bolt 24.
G... is the auxiliary spacer 22 fitted to the port 24
a, while the sun gear 32b is mounted on the spacer 2
It is assumed that the intermediate shaft 32d is fitted onto an intermediate shaft 32d which is rotatable with respect to 2. Each gear 32a, 32b, 32C, 32C...
By selecting the number of teeth, the rotation of the roller body RL1 can be transmitted to the intermediate shaft 32d at an increased speed. Therefore, if the brake member 21 is fixed to the intermediate shaft 32d, the structure can be compact but large. It is possible to realize a speed increasing ratio.

According to the invention, as described in detail, the permanent j
A magnet and a brake member that moves relative to each other by cutting off the magnetic flux from the permanent magnet are provided, and one of the two members is interlocked with the roller body. When the roller body is rotated by the conveyed article, the brake member Since an eddy current is generated inside the brake member, a braking force can be generated between the permanent magnet and the brake member, and the brake member at this time does not come into contact with any other member, so the brake member Since there is no wear on the brake roller, the braking force can be maintained constant over a long period of time, but the brake member does not come into sliding contact with the surface of the brake roller, which could damage the surface of the brake roller and cause damage to the roller conveyor. This has an excellent effect in that there is no risk of shortening the lifespan.

In addition, the braking force based on eddy current increases as the rotation speed of the roller body increases, so it is essentially not suitable for the purpose of preventing the conveyance speed of the conveyed article from becoming excessive. Unlike a mechanical brake, there is no risk of locking the roller body and making it impossible to rotate at all, and the roller conveyor has the advantage of always being able to function effectively.

[Brief explanation of the drawing]

1 to 3 show an embodiment, in which FIG. 1 is an overall vertical sectional assembly view, FIG. 2 is a plan view of the permanent magnet, and FIG. 3 is an explanatory view of the state of use. FIG. 4 is a diagram corresponding to FIG. 1 showing another embodiment. 5 and 6 roughly show other embodiments, with FIG. 5 being a diagram corresponding to FIG. 1, and FIG. 6 being a diagram corresponding to FIG. 2. 7 to 9 are views corresponding to FIG. 1 showing other embodiments, respectively. . RLI...Roller body N, S...Magnetic pole 11.11a...Permanent magnet 21...Brake member 30...Speed-up mechanism

Claims (1)

[Scope of Claims] 1) A permanent magnet, and a brake member that moves relatively near the magnetic pole of the permanent magnet by cutting off the magnetic flux from the permanent magnet, wherein either the permanent magnet or the brake member A brake device for a roller conveyor that has one side interlocked with the roller body. 2) The brake device for a roller conveyor according to claim 1, wherein the permanent magnet or the brake member interlocking with the roller body has a speed increasing mechanism between it and the roller body. 3) The brake device for a roller conveyor according to claim 1 or 2, wherein the permanent magnet and the brake member are incorporated into the roller main body.