JPS6246671Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a powder quantitative supply device for quantitatively feeding pulverized coal to, for example, a pulverized coal burner.

Configuration of a conventional example and its problems One of the conventional quantitative supply devices for powder and granular material will be explained based on FIG. 1. Reference numeral 1 denotes a hopper for storing powder or granular material 2, and a powder or granular material discharge port 3 is formed in the bottom plate 1A of the hopper. 4 is an annular shelf formed on the inner circumferential surface of the hopper 1 at a proper position above the bottom plate 1A, 5 is a powder supply port formed in the annular shelf 4, 6 is a drive shaft passing through the center of the bottom plate 1A, 7 is a measuring device disposed between the annular shelf 4 and the bottom plate 1A and fixed to the drive shaft 6, and has a plurality of measuring through holes 8. Reference numeral 9 designates a rotary table disposed under the bottom plate 1A and fixed to the drive shaft 6, 10 a fixed cutting plate disposed above the discharge port 11, and 12 a uniform plate.

In the above configuration, when the drive shaft 6 is rotated in one direction, the weighing box 7 and the rotary table 9 are also rotated in the same direction, and the powder 2 in the hopper 1 enters the weighing through hole 8 from the supply port 5. The powder 2 in the through hole 8 falls from the discharge port 3 onto the rotary table 9, hits the cutting plate 10, falls into the discharge port 11, and is supplied to a pulverized coal burner, etc. be.

With the conventional configuration described above, it is possible to reliably cut out a fixed amount at a time, and it has excellent fixed-quantity supply performance over a long period of time, but on the other hand, at the boundary between the metering through holes 8, Since the supply of 2 is interrupted, so-called pulsation occurs. This pulsation poses no problem if the rotational speed of the weighing chamber 7 is high, but if the rotational speed becomes small, the pulsation extends to the wake of the powder supply device, making continuous feeding necessary, for example. This is a problem in pulverized coal burners as it often causes misfires.

There is a device shown in FIG. 2 that solves this problem. This is provided with a guide tube 15 hanging down from a through hole 14 in the bottom plate 1A of the hopper 1, and a stirring blade 16 attached to a drive shaft 6 inserted into the guide tube 15.
is fixed, and the cutting plate 10 is movable by a handle 17. According to this configuration, the granular material 2 adhering to the rotary table 9 in a conical shape is guided to the discharge port 11 by the movable cutting plate 10, so that the granular material 2 is continuously supplied. It will be done. However, the amount of powder 2 on the table 9 varies depending on the properties of the powder 2, and fluctuations in the supply amount due to changes in properties appear over a long time period.
It is extremely difficult to eliminate this. Therefore, it is difficult to apply, for example, to a pulverized coal burner that requires accurate flow control over a long period of time.

Purpose of the invention An object of the present invention is to provide a powder and granular material quantitative supply device that eliminates the above-mentioned conventional drawbacks.

Structure of the invention In order to achieve the above object, the powder and granular material quantitative supply device of the present invention has a powder and granular material discharge port formed in the bottom plate of the powder and granular material storage hopper, and an annular shape on the inner circumferential surface of the hopper at a suitable position above the bottom plate. A shelf is formed, and a granular material supply port is formed at an appropriate position on the annular shelf, and a measuring cell having a plurality of measuring through holes is rotatably disposed between the annular shelf and the hopper bottom plate, and a weighing cell having a plurality of measuring through holes is rotatably disposed below the bottom plate. A rotating body that rotates integrally with the weighing device is provided in a box provided in the box, the upper part of the rotating body is formed into a tapered shape with a downward convexity, and the upper part of the inner circumferential surface of the box is inclined to match the shape of the upper part of the rotating body. , a rotary table extending horizontally outward from the lower end of the rotating body is provided, and a box is provided with a cutting plate for discharging the powder on the rotary table to a discharge port.

Embodiment and operation Hereinafter, an embodiment of the present invention will be described based on FIG. 3. Components that are the same as those shown in FIGS. 1 and 2 are given the same numbers and their explanations will be omitted.
19 is a box provided under the bottom plate 1A; 12 is a rotating body disposed within the box 19 and fixed to the drive shaft 6; The lower part 20B is formed in a tapered shape that tapers upward. The upper part 19A of the box 19 is connected to the upper part 20 of the rotating body 20.
It is tilted to match the shape of A. 21 is a stirring blade fixed to the upper part 20A of the rotating body 20.

Hereinafter, the effects of the above configuration will be explained. When the drive shaft 6 is rotated in one direction, the weighing box 7, rotary body 20, and rotary table 9 are also rotated in the same direction, and the powder 2 in the hopper 1 is transferred to the supply port 5.
The powder and granular material 2 in the through hole 8 enters from the discharge port 3 into the annular passage with a downward concavity between the box upper part 19A and the rotating body upper part 20A, and flows down the passage. During this time, the powder and granular materials 2 intermittently dropped from the discharge port 3 peck each other, and the powder and granular materials 2 come to adhere to the lower part of the rotating body 20B in a conical shape. Further, at this time, the powder 2 in the annular passage is stirred by the stirring blade 21, so that the powder 2 is evenly spread, and the powder 2 can be continuously supplied more reliably. Next, the granular material 2 on the rotary table 9 is cut out by a cutting plate 10, guided to a discharge port 11, and supplied to a pulverized coal burner or the like.

Effects of the invention As described above, according to the invention, it is possible to supply powder or granules in fixed quantities using the measuring cup, and the powder or granules intermittently dropped from the discharge port are connected to the upper part of the rotating body and the box. They peck each other while flowing down the annular passage in the lower depression between the upper part and the upper part. Therefore, the granular material on the rotary table can be continuously cut out by the cutting plate, and so-called pulsation does not occur, making it suitable as, for example, a device for quantitatively feeding pulverized coal to a pulverized coal burner. It is.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are longitudinal sectional views each showing a conventional example. FIG. 3 is a longitudinal sectional view showing an embodiment of the present invention. 1...Hotsupa, 1A...Bottom plate, 2...Powder,
3... Powder discharge port, 4... Annular shelf, 5... Powder supply port, 7... Measuring chamber, 8... Measuring through hole,
9... Rotating table, 10... Cutting plate, 11...
Discharge port, 19... Box, 19A... Upper part of box, 20... Rotating body, 20A... Upper part of rotating body, 21... Stirring blade.

Claims (1)

[Claims for Utility Model Registration] 1. A powder discharge port is formed on the bottom plate of a powder storage hopper, and an annular shelf is formed on the inner circumferential surface of the hopper at an appropriate position above the bottom plate, and powder is disposed at an appropriate position on the annular shelf. A weighing cell that forms a granule supply port and has a plurality of measuring through holes is rotatably arranged between the annular shelf and the hopper bottom plate, and rotates integrally when the weighing cell is placed in a box provided below the bottom plate. A rotating body is provided, and the upper part of the rotating body is formed into a downwardly tapered shape,
The upper part of the inner circumferential surface of the box is inclined to match the upper shape of the rotary body, and a rotary table extending horizontally outward from the lower end of the rotary body is provided, and the box is provided with a rotary table for discharging the powder on the rotary table to the discharge port. A powder quantitative supply device characterized by being provided with a cutting plate. 2. The powder and granular material quantitative supply device according to claim 1 of the utility model registration, characterized in that a stirring blade is provided on the upper part of the rotating body.