JPS60295B2 - Fixed quantity feeder rotary feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary feeder for quantitatively feeding powder and granular materials.

In general, a rotary feeder for quantitatively supplying powder and granular materials (e.g., cement) has a rotor with radial blades rotatably installed inside a cylindrical case, and has an inlet at the top and an outlet at the bottom. A certain amount of powder is supplied by falling into a compartment between the blades and the case, and is transported by the rotation of the rotor and discharged in a predetermined amount depending on the rotation speed.

In the rotary feeder mentioned above, the center of the rotor and the center of the case are aligned, and the tips of the blades are in sliding contact with the inner peripheral surface of the case. The side part on the side is preferable for supplying a constant quantity, but conversely, on the side part on the return side from the discharge port to the inlet, a so-called pump effect occurs that coughs up air and supplies it to the inlet. There is a problem that the powder and granules are no longer delivered to the compartment and the supply is not constant.
This is noticeable when the rotor rotates at high speed. The present invention has been made in view of the above, and includes a rotor whose axis is eccentrically moved from the center of the case toward the transfer side, and in which the blades of the rotor and the inner circumferential surface of the case are on the transfer side. To provide a fixed quantity supply rotary feeder which is in contact with the other parts and has a small gap on the return side to prevent air from being coughed up and to ensure fixed quantity supply.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the drawings. Reference numeral 1 designates a fixed quantity supply rotary feeder, which is attached to, for example, a cement storage box and discharges a fixed quantity of cement, and has a rotor 3 inserted into a case 2 so as to be rotatable.

The case 2 has an inlet 4 in the upper part and an outlet 5 in the lower part. Transport is carried from the inlet 4 to the cylindrical part 7 via the vertical guide part 6, and from the lower part of the cylindrical part 7, the vertical guide part 8 is connected. The discharge port 5 is provided with flanges 9 and 10 on the periphery of the inlet port 4 and the discharge port 5. The rotor 3 is held by a cylindrical portion 7, a base portion 11' is integrally fixed to a pivot shaft 12, and a plurality of blade portions 13 are arranged in a radial arrangement.

The rotor 3 rotates in a clockwise direction (see arrow A in the drawing), and is directed from the inlet port 4 to the discharge port 5 on both sides where the tips of the blade portions 13 and the inner circumferential surface of the cylindrical portion 7 face each other. The right side is the transfer side 15, and the left side facing the inlet 4 from the discharge port 5 is the return side 16. Further, the radius of the tip of the blade of the rotor 3 is slightly smaller than the radius of the inner circumference of the cylindrical portion 7, and the axis X of the pivot 12 is eccentric from the center Y of the cylindrical portion 7 toward the transfer side 15, and the tip of the blade portion 13 contacts the inner circumferential surface of the cylindrical portion 7 on the transfer side 15 to form a compartment 17, while on the return side 16 there is a small gap M with the inner circumferential surface of the cylindrical portion 7 to allow free circulation of air. It has become. 18 is an elastic scraper fixed to the flange 1, which is curved and has a roller 1 at its tip.
9 is rotatably supported, and a roller 19 comes into contact with the outer surface of the blade portion 13 to remove attached cement.

Next, the operation will be explained.

When the rotor 3 is rotated clockwise (in the direction of arrow A), the cement naturally falls from the inlet 4 and is supplied between the blades 13 and into the compartment 17 with the inner peripheral surface of the cylindrical part 7. The amount of cement is transferred to the discharge port 5 and discharged, and a predetermined amount of cement is discharged depending on the rotation speed of the rotor 3. When the rotor 3 rotates, a small gap M exists between the blade portion 13 and the inner peripheral surface of the cylindrical portion 7 on the return side 16.
The coughed air will also escape to the exhaust port 5,
Supply to the inlet 4 is prevented. In this embodiment, the case of transporting cement has been described, but the present invention can also be applied to powdered materials such as grains.

In addition, although the roller 9 is provided on the scraper 18, it is not necessarily provided and the tip of the scraper 18 may be brought into direct contact with the roller 9. It is preferable to provide

As described above, according to the present invention, the blade tip radius of the rotor is formed to be slightly smaller than the inner circumferential radius of the case, and
The rotor is provided with its axis offset from the center of the case to the transfer side, and the blades of the rotor and the inner peripheral surface of the case are in contact with each other on the transfer side, while leaving a small gap on the return side. Since the air is coughed up between the blades from the discharge port to the inlet, it escapes through a small gap, and a certain amount of powder and granules are supplied between the blades and transferred. , it is possible to accurately supply a predetermined amount of powder or granular material.

[Brief explanation of the drawing]

The drawing is a cross-sectional view of a quantitative supply rotary feeder showing an embodiment of the present invention. 1... Rotary feeder, 2... Case, 3... Rotor, 4... Inlet port, 5... Outlet port,
12... Pivot, 13... Wing part.

Claims (1)

[Claims] 1. In a rotary feeder in which a rotor is rotatably provided in a case and the rotor is rotated to transfer powder, granules, etc., the blade tip radius of the rotor is slightly smaller than the inner circumferential radius of the case. At the same time, the rotor is pivotally supported with its axis being offset from the center of the case to the transfer side, and the blades of the rotor and the inner circumferential surface of the case are in contact with each other on the transfer side, while on the return side. This is a fixed-quantity feeder rotary feeder that is characterized by having a small gap to allow air to circulate freely.