JPS5942114Y2 - Continuous automatic powder feeder - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for continuously and automatically feeding powders such as coal-carbon and activated carbon, especially highly fluid powders.

The conventional continuous automatic powder feeder is a rotary type powder feeder that continuously feeds powder in a fixed amount using multiple radially arranged rotating blades, but between the blades and the inner wall of the casing Since a clearance of 0.2 to 0.3 m is required in the mechanical design, fluid powder leaks from this clearance, resulting in poor powder feeding accuracy, and powder adheres to the inner wall of the casing. This adhering powder causes friction with the blade or the rotating powder, and the frictional heat causes a chemical reaction and solidifies, which has the disadvantage of interfering with the smooth rotation of the blade and deteriorating accuracy. Ta.

Furthermore, the amount of powder fed at any moment changes pulsatingly as the rotary blade rotates.

This causes incomplete combustion and incomplete reaction when feeding coal powder, slaked lime, calcium carbonate, etc., which require moment-to-moment powder feeding precision, and increases the generation of Co, HCl, etc.

As shown in Japanese Utility Model Publication No. 47-17401, a continuous automatic powder feeder is equipped with two storage cylinders, an upper one and a lower one, and the powder is dropped from the upper part to the lower part with a stirring blade, and a scraper is installed at the bottom of the lower storage cylinder. It is known that a one-sided rotating disk is installed to supply a fixed amount of powder, but in this case, the amount of powder stored in the lower storage cylinder is an indefinite amount that far exceeds the fixed amount of supply, so the amount of powder in the lower storage cylinder is The influence of pressure cannot be sufficiently eliminated, and since the measurement is not performed at the stage of the upper and lower housing cylinders, the measurement is performed once using a rotating disk, which has the disadvantage that it is difficult to obtain sufficiently high accuracy.

The present invention aims to eliminate these drawbacks and provide a continuous automatic powder feeder that enables smooth powder feeding without pulsation.

In this invention, a plurality of rotary supply plates 2 each having a plurality of bottomless bottoms 1 are provided in a vertical cylinder 3 in multiple stages, and the capacity of the rotary supply plates 1 is gradually reduced according to the lower stage. A rotary transfer table 5 having an annular powder storage shelf 4 that is not divided in the circumferential direction is provided below, and a scraper 6 is provided on the rotary transfer table, and the upper opening of the vertical cylinder 3 is connected to the powder introduction port T and the scraper A partition wall 10 having a powder communication hole 9 is provided above the uppermost rotary supply plate 2, between the rotary supply plates 2 and between the rotary supply plate 2 and the rotary transfer table 5, And powder communication hole 9
This relates to a continuous automatic powder feeder in which the positions of the holes are shifted so that the holes are not continuously at the same circumferential position, and the rotary supply plate 2 and the rotary transfer table 5 are driven to rotate at a predetermined speed.

In addition, in the figure, 11 is a stirring blade, 12 is a rotating shaft that rotates the stirring blade, the rotary supply board 2, and the rotary transfer table 5;
13 is a chute, 14 is a worm gear, and 15 is a drive shaft.

In this device, powder is introduced from the powder introduction port 1 at the upper opening of the vertical cylinder 3, and is passed through the powder communication hole 9 of the uppermost partition wall 10 by means such as stirring blades 8 to the first stage rotary supply plate 2. Sent within the bottomless box 1.

A fixed amount of powder is first filled into a space surrounded by a bottomless 10 square peripheral wall and upper and lower partition walls 10, and is transferred as the rotary supply plate 2 rotates.

However, at this stage, the strong pressure due to the large amount of powder contained in the vertical cylinder 3 acts through the first stage communication hole 9 which is the supply port, so the first stage rotary supply board 2 becomes bottomless. The influence of the powder pressure in the vertical cylinder 3 cannot be sufficiently avoided when filling the powder into the first stage.
The powder in the bottom chamber 1 is transferred by rotation and is dropped into the bottom chamber 1 of the second stage rotary supply plate 2 through the communication hole 9 of the second stage partition wall 10.

Here, the position of the communication hole 9 of the second-stage partition wall 10 is not at the same circumferential position as the position of the communication hole 9 of the upper partition wall 10, but is shifted, so that the powder pressure inside the vertical cylinder 3 is lowered by one level. eye septum 10
It can be avoided that the communication hole 9 of the first stage rotary supply board 2 acts directly through the bottom 1 of the first stage rotary supply plate 2 and the communication hole 9 of the second stage partition wall 10, and the first stage partition wall 10 , it is possible to completely prevent the powder pressure inside the vertical cylinder 3 from affecting the filling of the powder into the bottom 1 of the second-stage rotary supply plate 2.

Moreover, the capacity of the bottomless chamber 1 of the second-stage rotary supply plate 2 is smaller than that of the first stage, and the powder is first refilled into the space with a slightly smaller fixed amount, and then the second-stage rotary supply It is transferred as the disk rotates 20 times, and is dropped onto the annular powder storage shelf 4 of the rotary transfer table 5 below through the communication hole 9 of the partition wall 10 of the third stage.

Here, since the capacity of each cell 1 is gradually decreased toward the bottom, it is possible to fill each cell with powder while minimizing the influence of powder pressure.

First, a predetermined volume of powder is dropped onto the annular powder storage shelf 4, but it bottoms out.Since 1 is partitioned, the amount of powder placed on the annular powder storage shelf 4 in the circumferential direction is is fluctuating in a pulsating state.

Next, the powder is rotationally transferred as the rotary transfer table 50 rotates, and the annular powder storage shelf 4 is continuously moved to the discharge port 8 by the scraper 6 and discharged.
Due to the continuous discharge, the discharge flow rate of powder from the discharge port 8 is averaged, and a fixed amount of powder is continuously supplied to the next stage device without pulsation.

Since the powder does not come into contact with the inner wall of the vertical cylindrical body 3 during the transfer process of the rotary supply plate, the powder does not leak from the clearance between them, nor does it adhere and solidify.

Further, even if there is adhesion to the inner wall of the vertical cylindrical body 3 during the transfer process of the rotary transfer table 5, since there are no blades, frictional heat will not be generated and solidification will occur, so there is almost no problem in practice.

In the embodiment, the rotary supply board 2 has two stages, but it goes without saying that it may have three or more stages.

As described above, according to the present invention, a fixed amount of powder is stored in the bottom 1 of the rotary supply plate, and since the powder does not come into direct contact with the inner wall of the vertical cylinder 3, there is no possibility of powder leaking or adhesion. It does not solidify and the quantitative accuracy of powder feeding is high.

Furthermore, the powder fed in fixed quantities by the rotary transfer table 5 can be fed continuously and evenly without pulsation, and in particular, it is possible to feed powder such as lime powder, slaked lime, calcium carbonate, etc. due to pulsating changes in powder feeding. This has the effect of eliminating the occurrence of incomplete combustion and incomplete reactions.

Furthermore, the vertical cylindrical body 3 has a very strong influence by having the rotary supply plate 2 in two or more stages, and by making sure that the communication holes 9 of the partition walls 10 are shifted from each other so that they are not continuously located at the same circumferential position.
It is possible to completely block out the powder pressure caused by the powder inside the container, thereby achieving the excellent effect of enabling highly accurate quantitative supply.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the continuous automatic powder feeder of the present invention, and FIG. 2 is a plan view thereof. 1: Bottomless, 2: Rotating supply plate, 3: Vertical cylinder, 4:
Annular powder storage shelf, 5...rotary transfer table, 6: scraper T: powder introduction port, 8: discharge port, 9: powder communication hole, 10: partition wall.

Claims (1)

[Scope of utility model registration request] A plurality of rotary supply plates 3 each having a plurality of bottomless bottoms 1 formed around the entire circumference are provided in the vertical cylinder 3 in multiple stages. Annular powder storage shelf 4 that is not divided in the circumferential direction
A rotary transfer table 5 having Powder communication holes 9 are provided above the plate 2, between the rotary supply plates 2 and between the rotary supply plate 2 and the rotary transfer table 5.
A partition wall 10 is provided, and the positions of the powder communication holes 9 are shifted so that they are not continuously located at the same circumferential position, and the rotary supply plate 2 and the rotary transfer tape/I15 are driven to rotate at a predetermined speed. Continuous automatic powder feeder.