JPH09196343A - Rotary feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To substantially eliminate wear, and hence improve sealing properties and stabilize the amount of cutting by mounting a roller attachment moving with a roller subject to free rotation such that a part thereof located on a rotor side of a belt makes contact with a rotor outer periphery, and backwardly returning a part thereof located on a casing side of the belt. SOLUTION: Powder-grain inserted from an inlet A are filled burying a valley between blades 4 of a rotor, is conveyed in the direction of rotation of the rotor 2, and makes contact with a belt type roller attachment 5 to permit the valley to be closed with the belt 7, and is further moved to an outlet B together with the belt 7. The belt 7 moves following the movement of the rotor 2, and the powder-grain filled in the valley in the rotor 2 fall down with the gravity when the powder-grain move to a lower part of the rotor. The powder- grain adhered to the belt type attachment 5 are scraped down by a scraper 9. The powder-grain are scraped down with the scraper 9 just before it goes around between the casing 1 and the roller 6 so that it is prevented from adhering to the casing 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary feeder applied to an ash processing apparatus for coal-fired boilers, a coal storage facility, and the like.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a conventional rotary feeder as viewed from the side, and FIG. 5 is a sectional view of the rotary feeder as viewed from the front. In the figure, 1a is a casing,
Reference numeral 2 is a rotor rotating in the same casing, 3 is a side plate of the rotor, 4 is a rotor blade, A is an inlet, B is an outlet, and M is a motor. The rotor 2 has a structure in which radial rotor blades 4 are mounted between two circular side plates 3 which are mounted at intervals, and are rotated by a motor M.

The rotary feeder divides powder particles or the like entered from the upper inlet A by the rotor blades 4, rotates them, moves them to the lower part, and sends them downward by gravity, and controls the rotation speed of the motor M. According to this, a predetermined amount of powder or the like is supplied.

In the conventional rotary feeder, during rotation of the rotor, powder particles or the like rotate while contact bites into the gap between the rotor blade and the casing. Both the casing and the rotor blade are thinned due to wear and the gap is enlarged, so that the sealing performance is deteriorated and the cutout amount becomes unstable. When this state is reached, it becomes necessary to take measures such as disassembling and hardening the hardened portion. Thinning on the casing side,
If scratches are found, the main body needs to be replaced.

[0005]

The main cause of wear of the rotor blade and the casing is due to friction between the fixed casing and the powder particles entrapped in the gap between the rotating rotor blade. If there is a pressure difference between the inlet side and the outlet side of the rotary feeder, if this gap becomes large, gas flow will be generated, and powder inflow will occur, further abrasion phenomenon will occur, and thinning of rotor blades will accelerate. To be done. This makes it impossible to control the cutting amount, and in extreme cases, the powder or granular material will flow out even if the rotor is stopped.

An object of the present invention is to provide a rotary feeder which is free from the above-mentioned wear, has a high sealing property, and can maintain a stable cutting amount.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems and comprises a casing having an inlet at the upper portion and an outlet at the lower portion, a pair of circular side plates and a radial arrangement between them. A rotary feeder having a rotor having a rotor blade that is driven to rotate in the casing by a motor, in a roller guide and the same roller guide between the front and rear inner surfaces of the casing and the outer peripheral surface of the rotor. A belt-type roller attachment consisting of a plurality of rollers that are supported and can rotate freely and a belt that is wound around the outer circumference of the plurality of rollers and that moves freely with the free rotation of the rollers is The belt is mounted so as to be in contact with the outer circumference of the rotor, and the portion of the belt located on the rotor side is made to follow the outer circumference of the rotor to move forward. Relates rotary feeder for causing return the portion located on the casing side of the bets in the opposite direction.

[0008]

1 is a sectional view of a rotary feeder according to an embodiment of the present invention as seen from the side, and FIG. 2 is a sectional view of the rotary feeder as seen from the front. In the figure, 1 is a casing, 2 is a rotor, 3 is a rotor side plate, and 4 is a rotor blade. The casing 1 is slightly larger than the conventional casing 1a and has a slightly modified structure.
The rotor 2 including the side plate 3 and the rotor blade 4 is the same as the conventional one. 5 is a belt type roller attachment. 6 is a roller with a bearing of the same attachment,
7 is a belt with a wire. The portion of the belt 7 on the rotor side is in contact with the outer circumference of the rotor 2. A pair of the above attachments are provided on the front and rear inner surfaces of the casing 1. 9
Is a scraper, and one scraper is provided above and one below scraper. A is an inlet, B is an outlet, and M is a motor. The belt type attachment 5 and the scraper 9 are not provided in the conventional device.

FIG. 3 is an exploded perspective view of the belt type roller attachment 5 described above. Reference numeral 8 denotes a roller guide for holding the roller 6, which holds the shaft of the roller 6 and keeps the distance between the rollers. The belt type roller attachment 5 is composed of members 6, 7, and 8. The roller guides 8 are manufactured according to the curve of the rotor, and are composed of a pair of left and right and are mounted in front of and behind the casing. The belt 7 has wires inserted therein to prevent meandering, thereby improving durability.

In this apparatus, the rotor 2 is rotationally driven by the motor M. The powder and granules injected from the inlet A are filled in the valleys between the blades 4 of the rotor and filled.
Of the belt type roller attachment 5, the valley is covered with the belt 7 at the outer peripheral portion, moves with the belt 7 and goes to the outlet B. The belt 7 follows the movement of the rotor due to friction. When the powder or granular material filled in the valleys of the rotor moves to the lower portion of the rotor, it separates from the belt-type roller attachment 5, falls by gravity, and is discharged from the outlet B. The discharge amount is controlled by the rotation speed of the motor M.

The powder particles attached to the belt type roller attachment are scraped off by the scraper 9. The powder particles are scraped off by the scraper 9 immediately before going around between the casing 1 and the roller 6, so that the powder particles do not adhere to the casing. In the past, the casing had to be made of a thick cast product, but since this device does not cause wear, it can be made by bending a steel plate. Further, since the belt 7 moves in the conveying direction at the same speed as the rotor 2, the abrasion is extremely small.

[0012]

In the rotary feeder of the present invention, between the front and rear inner surfaces of the casing and the outer peripheral surface of the rotor, a plurality of rollers, which are supported by the roller guides and are freely rotatable, are provided. A belt type roller attachment consisting of a belt which is wound around the outer peripheral side of the roller and freely moves as the roller freely rotates is mounted so that the portion of the belt located on the rotor side is in contact with the outer periphery of the rotor. The portion located at the position is moved to follow the outer circumference of the rotor and the portion located at the casing side of the belt is returned in the opposite direction, so that the following effects are brought about. (1) The wear resistance is high because there is no biting of the granular material. (2) There is almost no need for hardfacing. Therefore, maintenance costs are reduced. (3) Excellent sealability. (4) Since the amount of cutting is stable, it is possible to carry out precise transportation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rotary feeder according to an embodiment of the present invention as seen from a side surface.

FIG. 2 is a sectional view of the rotary feeder as viewed from the front.

FIG. 3 is an exploded perspective view of parts of a belt type roller attachment mounted on the rotary feeder.

FIG. 4 is a cross-sectional view of a conventional rotary feeder as viewed from the side.

FIG. 5 is a sectional view of the rotary feeder as viewed from the front.

[Explanation of symbols]

 1,1a Casing 2 Rotor 3 Side plate of rotor 4 Blades of rotor 5 Belt type roller attachment 6 Roller 7 Belt 8 Roller guide 9 Scraper

Claims (1)

[Claims] 1. A casing having an inlet provided at an upper portion thereof and an outlet provided at a lower portion thereof, a pair of circular side plates and rotor blades radially provided between the casing, and is rotationally driven in the casing by a motor. In a rotary feeder including a rotor, between a front and rear inner surface of the casing and an outer peripheral surface of the rotor, a roller guide and a plurality of rollers supported by the roller guide and freely rotatable, and an outer circumference of the plurality of rollers. A belt-type roller attachment consisting of a belt that is hung around the side and moves freely with free rotation of the roller is mounted so that the portion of the belt located on the rotor side is in contact with the outer circumference of the rotor, and is located on the rotor side of the belt. The part is made to follow the outer circumference of the rotor, and the part located on the casing side of the belt is returned in the opposite direction. Characteristic rotary feeder.