JPS581756Y2 - improved rotary dryer - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a rotary dryer. By providing a sheet with a curtain-like cut at least in the lower part on the end face of a trommel attached to the end of the rotary drum, dry powder and granules can be easily removed. It ensures separation from things.

A rotary dryer is a dryer in which a cylindrical rotating body is installed with a moderate inclination, and the raw material to be dried is supplied from one end, transported as it rotates, and dried before being discharged from the other end. It is often required to separate powder and granules of a desired particle size to be discharged from rotation and agglomerates of a larger size.

A separate sieve may be installed for this purpose, but by attaching a trommel to the end of the rotary cylinder, the powder and granules can be separated and the lumps and granules can be taken out from separate ports. .

In such a rotary dryer with a trommel, a considerable amount of powder entrained in the air flow inside the dryer is mixed in at the outlet of the lumps.
The particles are taken out along with the lumps, resulting in loss of powder and granules, and dust is generated during transportation and handling of the lumps, causing a deterioration of the working environment.

The present invention was developed as a result of various studies to solve these problems, and it is a partition made of a sheet with a curtain-shaped cut in the lower part that is in contact with the end surface of the trommel attached to the end of the rotary drum of a rotary dryer. By providing this, the air inside the dryer is restricted and powder is almost completely prevented from being mixed into the lumps.

Next, it will be explained using the drawings.

The rotary dryer has a cylindrical rotating body 1 installed at a moderate inclination, an inlet air box (hood) 2 and a drying material supply port 3 at one end, and a drying material supply port 3 at the other end of the rotating body 1. ~The trommel 4 is attached, and the end of the rotary drum 1 including the trommel 4 is connected to an outlet air box (hood) 5, and the outlet air box 5 has a powder and granule material outlet 6 and a lump material removal lower. The improved rotary dryer according to the present invention is provided with a partition 9 made of a sheet in contact with the end surface 8 of the trommel 4 and having at least a lower part cut into a curtain shape.

Providing such a partition 9 prevents the powder from being mixed with the lumps and taken out.

At least the notched part of this curtain shape is made of a flexible material, such as a rubber sheet, and the upper part may be made of a flexible material or a metal plate, etc. It does not sway much due to the flowing wind, and has the flexibility to be easily pushed and spread by the lumps transported inside the rotating drum 1 and discharged from the end face of the trommel.

This partition 9 is attached to the inside of the outlet air box (hood) 5 so as to be in contact with the end face of the trommel or with a small gap between them.

The portion having this vertical cut should extend to a position at least slightly higher than the layer height of the lumps in the trommel, preferably approximately l of the height of the trommel (the height and diameter of the trommel), and the interval between them is the diameter of the lumps to be discharged. It is desirable to set it to about several times that of .

By doing this, product loss is almost eliminated.

If the notch extends too far to the top, the rotary drum will be easily shaken by the wind flowing inside the rotary drum, and the powder will fly out from the gap and be mixed with the lumps and taken out, which is undesirable.

In addition, a rubber damper 10 is attached to the lump removal lower, which closes the outlet when no weight is applied, and opens the outlet when a certain amount of weight is applied, to improve sealing performance and minimize the possibility of external cold air entering the dryer. It is preferable to improve the fuel consumption rate.

Examples are shown below.

(Example) Soil with a moisture content of approximately 30% by weight was supplied to a rotary dryer equipped with a trommel having a 15mm opening at the outlet of a cylinder with a body diameter of 1700 mm and a body length of 15000 mm, and the moisture content at the outlet was 5 to 7%. %.

If there is no partition, 5.25 T/H from the powder outlet and 0.125 T/H together with the agglomerates from the agglomerate outlet for a feed rate of 7.5 T/H. of powder was being discharged.

A partition was provided on the inner surface of the outlet hood at a position 20 mm apart from the end face of the trommel, the upper half of which was made of an iron plate and the lower half made of a rubber sheet with a thickness of 3 mm.

In this rubber sheet, make a vertical cut of 5Qmm from a position 5Qmm away from the bottom edge to a length of 1 of the height of the rubber sheet.
Set at intervals.

By installing this partition, no lumps can be removed from the lumps outlet.
Only 125 T/h was discharged, and the powder discharge was almost zero.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotary dryer according to the present invention. FIG. 2 is a front view of the rotary dryer of the present invention, and FIG. 3 shows a curtain-like partition plate. 1 is a rotary cylinder, 2 is an inlet wind box, 3 is a raw material supply port, 4 is a trommel, 5 is an outlet wind box, 6 is a powder or granule material outlet, 7 is a lump material outlet, 8 is an end face of the trommel, 9 is a Curtain-like partition.

Claims (1)

[Scope of utility model registration request] A trommel is attached to the end of the rotary drum of a rotary dryer, in which raw materials are supplied from one end of the rotary drum installed horizontally or with a moderate slope, and dried material is taken out from the other end. An improved rotary dryer characterized in that, in the separating and taking out device, a partition is provided in contact with the end face of the trommel, the lower part of which has a structure in which vertical cuts are made in a flexible material.