JPS6123140B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for uniformly and quantitatively discharging powder or granules from a housing containing the powder or granules, such as a hopper or a reaction vessel.

Conventionally, to discharge a fixed amount of powder or granular material from a container, a discharge port was usually provided at the bottom of the container, and a table feeder, rotary valve, belt feeder, vibrating feeder, screw feeder, etc. was installed there. Ta. Table feeders are often used especially when uniform discharge from the entire surface of the container is required, but conventional table feeders have not fulfilled their purpose.

Figure 1 shows the principle of a table feeder. Powder 2 is stored in a hopper 1. A table 3 is provided with a certain gap from the bottom end of the hopper,
This is fixed to a rotating shaft 4 and is configured to rotate. The granular material stops at a predetermined angle of repose 6. This granular material is scraped off by a scraping plate (fixed) 5. The powder in the hopper that is scraped off falls and stops at a predetermined angle of repose. These operations are repeated and the powder and granules are continuously discharged.

However, in this method, the part of the powder that has been discharged by the scraping plate always falls and is replenished. That is, the part of the granular material in the hopper directly above the scraping plate falls preferentially. When the granular material is discharged in this manner, the residence time of the granular material within the container varies greatly depending on the location within the container. Furthermore, if powders and granules with different particle sizes are mixed, segregation of the powders and granules occurs.

In FIG. 1, in order to ensure uniform discharge, it is conceivable to provide a large number of scraping plates around the table, but even in this case, the peripheral portion of the container will be preferentially discharged, and the central portion will be delayed. Furthermore, in the figure, even if the scraping plate is inserted all the way to the center of the table, the peripheral portion will still be discharged first, making uniform discharge difficult. Moreover, it is not preferable to insert the scraping plate all the way to the center of the table because the resistance exerted on the scraping plate is large, and a large force is required to rotate the table. Furthermore, in this method, there is a risk that granules such as granules that are not very strong will be destroyed.

The present invention is a device developed in view of the above-mentioned circumstances, and is capable of uniformly discharging powder and granules using a small torge on a rotating tray without destroying the powder and granules.

That is, the present invention includes a housing such as a hopper or a reaction vessel for storing powder and granules, a rotating shaft provided vertically below the housing, and a rotating tray fixed to the housing. In addition to having an opening through which the body falls, one or more scrapers are attached to the lower surface of the rotating basin, and furthermore, powder particles from the opening are arranged at a predetermined interval in the lower part of the rotating basin. It consists of a fixed disc that receives the powder, a rotating disc below the rotating disc that receives the powder that has fallen from the opening of the fixed disc, and a fixed scraper blade that scrapes off the powder.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the drawings, which are one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the device of the present invention, that is, C-
It is a sectional view of C. 3 is a sectional view taken along line AA in FIG. 2, and FIG. 4 is a sectional view taken along line BB in FIG.

In the figure, a rotating shaft 4 is provided in a vertical direction at the bottom of a cylindrical housing 1, and a rotating cylinder 3 is fixed to this shaft. The gap between the lower end of the housing 1 and the rotary disk 3 is made as small as possible within a range that does not impede rotation, so that the powder and granules are stopped on the rotating disk at a constant angle of repose in this gap. Naturally, therefore, the diameter of the rotating basin is larger than the diameter of the lower end of the housing.

The rotating tray 3 is provided with an opening 7 through which powder particles fall. 8 is the slit of the opening. The figure shows the case where there is one opening, but
A plurality of these may be provided at appropriate intervals and sizes. A scraper blade 5 is fixed to the lower surface of the rotating tray 3. In the case of the least number of holes, one may be sufficient, but as shown in FIG. 3, it is also possible to attach a plurality of arc-shaped objects with various lengths. The length, shape, and number of blades are determined by taking into consideration the properties of the powder, the position where the powder is to be scraped off, etc. If the number of blades is small, when the blades scrape together the granules on the fixed disk, which will be described next, the load of the blades on the granules will be large, so the granules with weak strength may be crushed.
In such a case, it is desirable to install a plurality of scrapers as shown in FIG. Regarding the shape of the scraping blade, when scraping the powder and granules on the fixed disk toward its outer circumference, assuming that the rotating tray is rotating clockwise as shown in Figure 3, the shape of the scraping blade is as shown in Figure 3. An arc-shaped one is preferable. Furthermore, if the arc-shaped curved surface is reversed, the powder particles will move toward the center, so in that case, an opening may be provided there and the particles may be discharged from there.

A fixed disk 9 is provided below the rotary disk 3. This is fixed to the lower case of the housing 1. A large number of openings 1 are provided on the outer periphery of the fixed disk 9.
0 is set. In the case of a method in which the powder on the fixed disk is collected in the center using scrapers, the opening 10 may be provided around the rotation axis of the fixed disk. However, in order to discharge a constant amount of powder and granular material, it is necessary that the opening 7 of the rotating tray 3 and the opening 10 of the fixed disk 9 do not overlap in the vertical direction.

The powder in the housing 1 falls through the opening 7 of the rotary disk 3 onto the stationary disk 9 and comes to rest at a predetermined angle of repose. The scraper blade rotates together with the rotating disk, pushing the powder on the fixed disk toward the outer circumference and causing it to fall through the opening 10. If there is an opening 7 behind the rotating scraper blade, the powder and granules will always fall through the opening 7 one after another since the lower part of the opening 7 will always have the powder removed. Since this opening 7 is rotating, the powder and granules fall equally from each part of the housing.

As can be seen from this, in the apparatus of the present invention, the amount of powder and granular material discharged depends on the distance between the tip of the slit 8 provided in the opening 7 and the fixed disk 9, the radial length of the opening 7, and the length of the rotating disk. Determined by rotation speed.

The device of the present invention allows powder and granules to fall onto a fixed disk from an opening of a rotating disk, and then moves the particles from an opening 10 of the fixed disk to a rotating disk 11 using scrapers attached to the lower surface of the rotating disk. In this system, the powder and granules are dropped onto a rotating tray 11 which is fixed to a rotating shaft 4 and rotates together with the rotating shaft, scraped off by a fixed scraping blade 12, and taken out from a discharge port 13.

In the case of powder or granular material that tends to cause bridging within the cylindrical housing 1, it is also possible to attach a stirring mechanism to the top of the rotating shaft 4, or to make the cylindrical housing 1 and the rotating shaft 4 eccentric.

According to the device of the present invention, (1) powder and granules can be uniformly discharged from inside the housing;

(2) The upper surface of the rotating cylinder, which is filled with powder and has a high powder pressure, does not have a part that creates resistance like a blade, so the torque is small and there is no mechanical trouble caused by the powder getting caught. Granules are not crushed.

(3) Since the torque is small, it is easy to manufacture large devices.

(4) In the case of a reaction vessel, since the reaction rate differs between the center of the vessel and the vicinity of the outer wall, if it is desired to change the discharge rate between the two, the height of the slit 8 in the opening 7 can be changed in the radial direction. On the side where the slit is long, the distance between the tip of the slit and the fixed disk is small, so less powder particles fall.

It has many excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a principle diagram of a general table feeder, Fig. 2 is a longitudinal cross-sectional view of the device of the present invention, and Fig. 3 is a line A-A in Fig. 2.
4 is a sectional view taken along line B-B. DESCRIPTION OF SYMBOLS 1... Housing, 3... Rotating disc, 4... Rotating shaft, 5... Scraping blade, 7... Opening, 9... Fixed disc, 10... Opening, 11... Rotating disc, 1
2... Scraping blade, 13... Discharge port.

Claims (1)

[Claims] 1 A housing 1 that stores powder and granules, a rotating shaft 4 provided vertically at the bottom of the housing 1, an opening 7 that is fixed to the rotating shaft and allows the powder to fall, and a scraper blade 5 on the lower surface. Rotating tray 3 with attached
A fixed disk 9 which receives the powder and granules from the opening 7 at the lower part of the rotary disk 3, a rotating disk 11 which receives the powder and granules from the opening 10 of the fixed disk 9, and a powder on the rotating disk 11. A quantitative discharge device for powder and granular material, which comprises a fixed scraping blade 12 that scrapes off granular material.