JPH07108733B2 - Rotary feeder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotary feeder used for supplying powdery particles, and more particularly to a rotary feeder suitable for supplying powdery particles having adhesive properties.

(Prior Art) A rotary feeder is used, for example, to quantitatively discharge a powder or granular material in a hopper to a tank or a transfer device. In the rotary feeder, an impeller having rotating blades radially arranged on a rotating shaft is rotatably supported in a casing, and powder particles falling from the hopper into the casing are rotated by the impeller. It is guided along the inner surface of the casing and is discharged from the discharge port provided in the lower portion of the casing. In the rotary feeder, the amount of powder particles guided by the rotary blades is determined by the rotation of the impeller, so that the powder particles can be quantitatively discharged.

In such a rotary feeder, when the granular material has adhesiveness, the granular material adheres to the rotary blade of the impeller, and all the granular material guided to the rotary blade is not discharged from the discharge port. There is a risk.

As a result, the amount of powder or granules supplied from the outlet may change. In addition, if the amount of powder or granules adhering to the rotary blades increases, the impeller may become unrotatable or may rotate in the form of a rod, and the powder or granules may not be supplied.

(Problems to be Solved by the Invention) The present invention is to solve the above-mentioned conventional problems, and an object thereof is to discharge powder particles adhering to rotary blades from a discharge port of a casing. As a result, it is to provide a rotary feeder capable of stably supplying a predetermined amount of powder or granules.

(Means for Solving Problems) The rotary feeder of the present invention is equipped with a casing having an inlet and an outlet for powder and granular material, an air supply pipe arranged in the casing, and attached to the air supply pipe. A rotary feeder having an impeller, wherein the impeller includes a rotating shaft rotatably fitted around the air supply pipe, a plurality of rotating blades radially arranged on the rotating shaft, and the rotating shaft. A shaft and the outer surfaces of the plurality of rotary vanes, and a coating material that does not allow particles to pass therethrough and has air permeability, and gas is passed from the air supply pipe through the rotary shaft and the coating material to the casing. And a means for discharging the powder toward the powder and granular material discharge port, whereby the above object is achieved.

(Examples) Examples of the present invention will be described below.

As shown in FIG. 1, the rotary feeder of the present invention has a cylindrical casing 10, an air supply pipe 20 and an impeller 30 arranged in the casing 10.

An inlet 11 for powder and granules is opened in the upper part of the casing 10, and a hopper 40 for storing the powder and granules is arranged above the inlet 11. The inside of the hopper 40 communicates with the inside of the casing 10 through the input port 11,
The powder or granules in 40 are supplied into the casing 10 through the charging port 11. A discharge port 12 for the granular material is opened at the bottom of the casing 10. The granular material in the casing 10 is discharged from the discharge port 12 and is arranged below the discharge port 12. Etc.

An air supply pipe 20 is arranged in the casing 10 along the axis thereof. The tip of the air supply pipe 20 located inside the casing 10 is closed, and an air supply port 21 is opened at the bottom of the casing 10 facing the powder and granular material discharge port 12. The air supply pipe 20 is connected to an air pump or the like arranged outside the casing 10, and a gas such as air flows through the air supply pipe 20.

An impeller 30 is attached to the air pipe 20. The impeller 30
Has a rotary shaft 31 rotatably fitted on the air supply pipe 20, and six rotary blades 32, 32, ... Radially arranged on the outer peripheral surface of the rotary shaft 31, for example, in six equal intervals. Have. The rotary blade 32
Is not limited to the case of 6 sheets, but it is also possible to arrange 8 sheets, for example.

The rotating shaft 31 is connected to a motor or the like arranged outside the casing 10 and rotated in the clockwise direction indicated by arrow A in FIG.

Six exhaust ports 31a, 31a, ... Are provided on the circumferential surface of the rotary shaft 31 between the adjacent rotary blades 32. Each exhaust port 31a is sequentially aligned with the air supply port 21 of the air supply pipe 20 as the rotating shaft 31 rotates.

The opposing side surfaces of the adjacent rotary vanes 32 and 32 and the outer peripheral surface of the rotary shaft 31 sandwiched between the rotary vanes 32 and 32 are
For example, it is covered with a breathable covering material 33 such as cloth or metal. The coating material 33 does not pass through the granular material and has air permeability. The covering material 33 is, for example, attached to each of opposite side surfaces of the adjacent rotary blades 32 and 32 via a spacer 34 so as to have a gap from each side surface, and at a central portion thereof, Rotation axis between both rotary blades 32 and 32
The peripheral surface of 31 is covered, and the exhaust port 31a opened in the peripheral surface is also covered. The covering material 33 is not limited to the cloth or the air-permeable metal, and may be a porous material that does not allow the particles to permeate and has air permeability.

The rotary feeder of the present invention having the above-described structure is provided with an air supply pipe.
While a gas such as air is allowed to flow through the inside of the 20, the rotary shaft 31 fitted on the air supply pipe 20 is rotated. On the other hand, the powder particles in the hopper 40 are charged into the casing 10 from the powder particle inlet 11, and the powder particles charged in the casing 10 rotate the rotary blades 32 as the rotary shaft 31 rotates. The adjacent rotating blades
It falls into the space surrounded by 32 and 32 and the inner peripheral surface of the casing 10. Then, by the rotation of the rotary blades 32 accompanying the rotation of the rotary shaft 31, the space moves inside the casing 10,
The particles in the space are guided by the rotary blades 32 and move to a position facing the particles discharge port 12 formed at the bottom of the casing 10. When the powder or granular material moves to such a position, the powder or granular material falls from the discharge port 12 and is supplied to, for example, a conveying device arranged below the casing 10.

In this way, when the space sandwiched by the adjacent rotary blades 32 and 32 faces the powder and granular material discharge port 12, and the powder and granular material located in the space can fall from the powder and the discharge port 12. The exhaust port 31a formed on the outer peripheral surface portion of the rotary shaft 31 between the rotary blades 32 and 32 is aligned with the air supply port 21 of the air supply pipe 20.
A gas such as air flowing therethrough is discharged toward the granular material discharge port 12 through the aligned air supply port 21 and exhaust port 31a. The gas discharged from the exhaust port 31a passes through the covering material 33 that covers the exhaust port 31a, and a part of the gas is a rotary blade.
It flows between the side surface of 32 and the covering material 33 that covers the side surface, and passes through the covering material 33 that is arranged so as to face the side surface of the rotary blade 32.
At this time, the gas causes the powder or granules adhering to the covering material 33 to be separated from the covering material 33, and the separated powder or granules are discharged from the discharge port 12.

With the rotation of the rotary blades 32, the air supply port 21 of the air supply pipe 20 and the exhaust port 31a of the rotary shaft 31 are aligned each time the powder or granular material guided by each rotary blade 30 is discharged from the discharge port 12. The gas is discharged from the exhaust port 31a, and the powder particles attached to the covering material 33 are separated.

(Effects of the Invention) In the rotary feeder of the present invention, the outer surfaces of the rotary shaft and the rotary blades are thus coated with the coating material, and the gas from the air supply pipe passes through this coating material to the powder and granular material discharge port of the casing. Since it discharges toward,
The powder particles can be reliably and stably discharged from the discharge port without sticking to the rotary shaft or rotary blade. Therefore, it is possible to continuously and stably supply a predetermined amount of powder or granular material guided by the rotary blades. By improving the airtightness between the inner surface of the casing and the tips of the rotating blades, even if the powder or granules are discharged under high pressure or under pressure from the discharge port, the gas discharged toward the discharge port will cause a predetermined amount. The powder and granules of are reliably discharged. Further, even if the rotary blade is rotated at a high speed, the powder particles are stably supplied from the discharge port, so that the supply amount can be increased even if the casing capacity is small.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary feeder of the present invention. 10 …… Casing, 11 …… Powder and granule inlet, 12 …… Powder and granule outlet, 20 …… Air pipe, 21 …… Air inlet, 30 …… Impeller, 31 ……
Rotating shaft, 31a ... Exhaust port, 32 ... Rotating blade, 33 ... Coating material.

Claims (1)

[Claims] 1. A rotary feeder comprising: a casing having an inlet and an outlet for powder and granules; an air feed pipe arranged in the casing; and an impeller attached to the air feed pipe. The impeller includes a rotary shaft rotatably fitted on the air supply pipe, a plurality of rotary blades radially arranged on the rotary shaft, and an outer surface of the rotary shaft and the plurality of rotary blades. And a gas-permeable covering material that does not allow the particles to pass therethrough, and means for discharging gas from the air supply pipe through the rotating shaft and the covering material toward the powder and granular material discharge port of the casing. , A rotary feeder equipped with.