JP2001219300A - Roller for roller compactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: Not to slide a tire on a rotary shaft. SOLUTION: Plural projecting parts 2 are formed on the end face 1A of a tire 1 mounted to a rotary shaft 5, an engaging ring 3 is shrink fitted/fixed to the shaft, the projecting parts are fitted to the recessed part 4 of the engaged ring 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller compactor, and more particularly, to a belt compact formed by strongly compressing a fine powder material supplied to a small gap between rolls rotating in parallel and opposite directions to each other. Alternatively, the present invention relates to a roller compactor for producing a small product. This product is crushed and classified to obtain granules having a desired particle size range.

[0002]

2. Description of the Related Art A conventional compactor equipped with a roller having a tire mounted on a rotating shaft will be described with reference to FIG. Tires 12, 12 'are attached to the centers of the rotating shafts 11, 11' of the rollers 10, 10 'by shrink fitting. The rotating shafts 11, 11 'are supported by bearings 14, 15 bearings 14', 15 'in left and right stands 13, 13', respectively.

[0003] The tire 12 is provided with bearings 1 on the left and right sides of the rotating shaft 10.
As they are guided so that they can move up and down in the stands 13 and 13 ', they are allowed to ascend and descend. Hydraulic cylinders 16, 16 'attached to the stands 13, 13' and having a substantially constant hydraulic pressure applied
The pistons 17 and 17 ′ apply a large load acting downward on the bearings 14 and 15.

[0004] Rotating joints 18, 18 'attached to one ends of the rotating shafts 11, 11' supply cooling water supplied from outside through pipes 19, 19 '(not shown) to the inner surfaces of the tires 12, 12'. I do. The cooling water that has cooled the tires 12, 12 'returns to the rotary joints 18, 18' again and is taken out of the machine.

[0005] The power applied to the other ends of the rotating shafts 11 and 11 'causes the respective tires 12 and 12' to rotate in directions opposite to each other, and the fine powder sent to the space between the tires 12 and 12 '. The raw material is pulled in the direction in which the gap between the tires 12 and 12 ′ decreases, the tire 12 is pushed up against the load of the hydraulic cylinders 16 and 16 ′, and strong pressure is applied to the fine powder raw material. The strip-shaped product 21 having a cross section substantially equal to the cross section surrounded by the seal plates 20 and 20 'in contact with 12' and the right and left roll side faces is discharged.

[0006] Heat generation of the raw material caused by abruptly compressing the raw material, and frictional heat generated by sliding between the raw material layer and the surface of the tire 12, 12 ', cause the tire 12, 1
2 'and the strip product 21 are heated. Tires 12, 12 '
Alternatively, in order to reduce the temperature rise of the raw material, the tires 12, 12 'are cooled with the cooling water as described above.

When the rotation is transmitted from the roll shafts 11 and 11 'to the tires 12 and 12' using the keys, it is difficult to prevent the cooling water from leaking from the gap between the keys and the key grooves. The tires 12 and 1 are located in the center of the shafts 11 and 11 '.
2 ′ are joined by shrink fitting, and O-rings 22 and 23 at both ends are joined.
To prevent leakage of cooling water.

[0008] In the case of tire materials such as salt, chloride, resin powder, resin additive, toner, etc., in which the fine powder material is easily hardened, generally, tough steel such as bearing steel (1C, 1Cr) is generally used. In the case of pharmaceuticals and foods in which rust is not allowed to be mixed, precipitation hardening stainless steel or the like is used.

In these cases, assuming that the diameter of the shaft on which the roll is mounted is d, the roll can be shrink-fitted to the shaft with a diameter interference of 1.2 d / 1000 to 1 d / 1000. Thus, the roll does not slide on the roll axis.

[0010]

However, in the case where the fine powder raw material is hard to solidify, for example, ferrite, magnesium oxide, manganese dioxide, and tungsten carbide, a tire having a diameter of 300 mm and a tire width of 1 mm are required.
It is necessary to apply a load of 6 to 8 tons per cm. Since these raw materials are very hard, the surface of the tire made of the above bearing steel is severely worn. Therefore, using high carbon high chromium steel (1.5C, 12Cr, etc.), or casting or powder metallurgy high speed steel is used. I have.

Although this material has high hardness and good abrasion resistance, it has low toughness.
When shrink-fitting on a shaft at / 1000 to 1d / 1000, cracks tend to occur from the inner surface of the tire and it is easily damaged. Therefore, in the case of these materials, shrink fitting is usually performed on the shaft with a diameter interference of 5d / 10000 or 3d / 10000.

With such a diameter interference, the tire 12,
The average temperature of 12 'is 40 to 30 higher than the average temperature of the rotating shaft.
If the temperature rises by ℃, there is a risk that the interference will disappear. Even if the tire slides slightly even on the rotation axis, a minute flaw is generated on the inner surface of the tire, and the above-mentioned tire material having high sensitivity to the flaw has a phenomenon that the crack progresses little by little and breaks.

In the case of tires 12 and 12 'having a small shrinkage allowance, which are allowed even when a large foreign matter enters the raw material and a large impact is applied to the tire by mistake, the tire slides on the rotating shaft and the inner surface of the tire is slipped. In some cases, leading to damage.

An object of the present invention is to prevent such a phenomenon from occurring.

[0015]

According to the present invention, there is provided a roller compactor having a roller having a tire mounted on a rotating shaft; a convex portion formed on an end surface of the tire; a shrink fit on the rotating shaft; A mating ring having a concave portion fitted to the convex portion.

According to the present invention, a fine powder material is supplied to a small gap between a roller and a roller having a hollow cylindrical tire fitted to the center of a rotating shaft adapted to rotate in opposite directions to each other. A roller compactor which is produced by compressing strongly to produce a strip-shaped or strip-shaped product; the end face having a constant thickness in the direction of the center line of the tire and a cross-section perpendicular to the center line of the tire being closest to the center of the tire. The distant side is an arc having a radius smaller than the radius of the cylindrical surface that compresses the fine powder raw material of the tire centering on the center of the tire, and the side near the center of the tire is the center of the tire center and the inner surface of the tire cylinder. A plurality of sector-shaped protrusions or similar outer and inner arcs which are arcs of a radius equal to or slightly larger than the radius and a parallel which is equidistant from a straight line passing through the center of the tire. And a tire having a plurality of strip-shaped protrusions, and the outer surface of the ring is a cylindrical surface having a radius equal to the radius of the plurality of fan-shaped or strip-shaped protrusions provided on the end face of the tire. The end face is provided with a plurality of concave portions that mesh with the fan-shaped or strip-shaped convex portions, and the rotating shaft is baked with a diameter allowance of 1.0 / 1000 to 2.0 / 1000 times the diameter of the fitting portion of the rotating shaft. And a meshing ring fitted to transmit torque for driving the tire from the rotating shaft to the tire.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A convex portion is formed on the end face of a tire press-fitted into a rotating shaft, and the ring is engaged with the rotating shaft and shrink-fitted into the ring, and the convex portion is fitted into a concave portion of the meshing ring. I do. The power to drive the tire attached to the rotating shaft is
From the inner surface of the meshing ring that strongly tightens the rotating shaft from the rotating shaft, it is transmitted to the tire through the contact surface between the concave portion on the side surface of the meshing ring and the convex portion on the side surface of the tire. The occurrence of slippage is completely prevented.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. Here, differences from the above-described conventional example will be described in detail. A plurality of convex portions 2 are formed on an end surface 1A of the tire 1. As shown in FIG. 2, the convex portion 2 has a constant thickness in the direction of the center line 1 </ b> C of the tire 1, and has an outer circular arc that is farthest from the center of the tire 1 in a cross section perpendicular to the center line 1 </ b> C of the tire 1. 1a is an arc with a radius r1 smaller than the radius R1 of the cylindrical surface 1S1 about the center of the tire 1 and for compressing the fine powder material of the tire 1, and an inner arc 1 near the center of the tire 1.
“b” is a fan-shaped arc centered on the center of the tire 1 and having a radius r2 equal to or slightly larger than the radius R2 of the hollow cylindrical surface 1S2 of the tire 1.

The tire 1 is connected to the center of the rotating shaft 5 by shrink fitting or press fitting.
Is fixed to the rotating shaft 5. O-rings R are provided at both ends of the tire 1 so that cooling water does not leak. Since the cooling water channel is the same as that of the conventional example, it is not shown in FIGS. 1 and 4 showing the embodiment of the present invention.

As shown in FIG. 3, the meshing ring 3 has a cylindrical surface 4A whose outer surface 3A is equal to the outer diameter r1 of the plurality of projections 2 provided on the end surface 1A of the tire 1. The inner surface 3B has a plurality of concave portions 4 meshing with the convex portions 2, and the inner surface 3B has a diameter d of a fitting portion of the rotating shaft 5 of 1.0 / 1000 to 2/1.
You are given a 000-fold diameter interference.

The engagement ring 3 is provided with the plurality of recesses 4.
Is fixed to the rotating shaft 5 by shrink fitting with a large interference in a state of being engaged with the convex portion 2 of the end face 1A of the tire 1.

The power for driving the tire 1 attached to the central portion of the rotating shaft 5 is transmitted from the inner surface of the meshing ring 3 that strongly tightens the rotating shaft 5 to the concave portion 2 on the side surface of the meshing ring 3 from the rotating shaft 5. Since the power is transmitted to the tire 1 through the contact surface of the convex portion 2 on the side surface of the tire 1, the occurrence of slip on the fitting surface between the tire 1 and the rotating shaft 5 is completely prevented.

A second embodiment of the present invention will be described with reference to FIGS. This embodiment is different from the first embodiment only in the shape of the convex portion of the tire and the shape of the concave portion of the meshing ring. That is, the convex portion 7 of the tire 6 is formed in a strip shape including an outer side 6a, an inner side 6b, and parallel lines 7a and 7b equidistant from a straight line 7L passing through the center of the tire 6. I have. The concave portion 9 of the meshing ring 8 is formed in a strip shape that meshes with the strip-shaped convex portion 7.

The embodiments of the present invention are not limited to the above, and the shapes and the number of the convex portions of the tire and the concave portions of the meshing ring are appropriately selected as needed. Further, in the above embodiment, the meshing ring is provided only on the right side of the tire, but it is needless to say that this ring may be provided on both left and right sides of the tire as required.

[0025]

According to the present invention, since the meshing ring is not worn by the fine powder material, it is shrink-fitted to the rotating shaft with a large interference with a tough steel such as chrome molybdenum steel to transmit a large torque from the rotating shaft to the tire. I can do it.

Further, since the temperature rise of the meshing ring is extremely small, a reduction in interference due to the temperature rise and a decrease in transmission torque due to this are slight.

Since a larger torque can be transmitted to the tire than the meshing portion with the meshing ring, the interference between the fitting of the rotating shaft and the tire can be small, and it can be made of high carbon high chrome steel or cast or powder metallurgy. The ferrite, magnesium oxide, manganese dioxide, and tungsten carbide can be granulated using a material having high wear resistance and low toughness such as high-speed steel.

In addition, a decrease in interference with the rotating shaft due to a rise in the temperature of the tire during operation, or occurrence of tire slippage on the rotating shaft due to the occurrence of an excessive impact load, etc. It is possible to prevent the tire from being damaged due to a flaw.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is a side view of the tire 1 as viewed in a direction A of FIG.

FIG. 3 is a side view of the meshing ring 3 as viewed in a direction B of FIG. 1;

FIG. 4 is a front view of a second embodiment of the present invention.

FIG. 5 is a side view of the tire 10 as viewed in a direction C in FIG.

6 is a side view of the meshing ring 8 as viewed in the direction D in FIG. 4;

FIG. 7 is a front view of a conventional roller compactor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tire 2 convex portion 3 meshing ring 4 concave portion 5 rotating shaft 6 tire 7 convex portion 8 meshing ring 9 concave portion

Claims (2)

[Claims] 1. A roller compactor having a roller having a tire mounted on a rotating shaft; a convex portion formed on an end surface of the tire; and a concave portion shrink-fitted to the rotating shaft and fitted to the convex portion. A roller of the roller compactor, comprising: 2. A fine powder raw material is supplied to a roller having a hollow cylindrical tire fitted to a central portion of a rotating shaft adapted to rotate in parallel and opposite directions to each other and to supply a fine powder material to a small gap between the rollers. In a roller compactor which is compressed to produce strip or strip products;
The side farthest from the center of the tire in a cross section perpendicular to the center line of the tire with a constant thickness in the centerline direction of the tire is smaller than the radius of the cylindrical surface that compresses the fine powder material of the tire with the center of the tire as the center. A circular arc with a radius, and the side near the center of the tire is a plurality of sector-shaped convex portions or similar outer portions that are arcs with a radius centered on the center of the tire equal to or slightly larger than the radius of the inner surface of the tire cylinder. A tire having a plurality of strip-shaped convex portions composed of a circular arc and an inner circular arc and a parallel line equidistant from a straight line passing through the center of the tire, and an outer surface of the ring is provided on a plurality of end faces of the tire. It is a cylindrical surface having a radius equal to the radius of the fan-shaped or strip-shaped convex portion, and one end face is provided with a plurality of concave portions that mesh with the fan-shaped or strip-shaped convex portion. The diameter of the fitting part is 1. An interlocking ring that is shrink-fitted with a diameter margin of / 1000 to 2.0 / 1000 times and that transmits torque for driving the tire from the rotating shaft to the tire. .