JPS61280382A - Powdered and granular drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a powder drying device used for evaporating and removing water contained in powder and granules. [Background Art] A powder dryer is used to remove it. A powder drying device supplies powder into a container and dries the powder by blowing hot air through it. However, in conventional powder drying devices, powder often adheres to the inner surface of the container during drying. Some powder and granular materials burn explosively at low temperatures, and when adhesion occurs, the adhering material increases in temperature due to heat transfer from the inside of the container and burns, as well as blocking the hot air flow. It may raise the temperature of the hot air and cause combustion. In order to prevent this, it is necessary to clean the inside of the container from time to time to remove deposits, which is extremely troublesome. It is an object of the present invention to provide a powder drying device that causes less adhesion of particles and does not require cleaning work inside a container.

[Disclosure of the invention]

In order to achieve the above object, the present invention includes a cylindrical container with both ends open and a supply means for supplying powder into the container, hot air flows into the container from one end, and powder is supplied from the other end. A drying device for powder and granular material that is configured to flow out together with the granules, characterized in that a cloth woven with smooth threads with no fluff on the surface is attached along the inner surface of the container. The gist is a drying device for powder and granular materials. An embodiment of this will be explained in detail below based on the accompanying drawings.

As shown in FIG. 1, this powder drying device includes a cylindrical container 1 with both ends open, a supply means 3 for supplying powder and granules 2 into the container, and a powder and granules supplied into the container. A crusher 4 for crushing the body 2 is provided. The supply means 3 consists of a hopper 5 and a screw conveyor 6. The screw conveyor 6 is connected to a powder supply lower provided in the container 1 . A screw 8 of the screw conveyor 6 is rotated by a motor 9, so that the powder 2 in the hopper 5 is supplied into the container from the powder supply lower. The lower end 10 of the container is connected via a duct 11 to a heating device such as a heat exchanger. The upper end 12 of the container is connected via a duct 1-13 to a product collection device and a suction device.

The lower end 10 of the container serves as an inlet for hot air, and the upper end 12
serves as an outlet for hot air and powder. The crusher 4 is built in the lower part of the container 1, and as shown in FIG. 2, it consists of a disk 14, an arm 15 fixed to the disk, and a tray 16 installed in the arm 15. The disk 14 is a perforated plate with numerous holes through which hot air can pass. The arm 15 is made of steel bent in a U-shape. The power of the motor 17 is the belt 1
8, the crusher 4 is rotated.

In the figure, 19 is a bearing section. The rotation of the crusher 4 disperses or loosens the aggregates of the granular material 2 supplied from the supply means 3 into the container 1.

In this way, a crusher is necessary for dispersing and loosening aggregates of powder and granules. It is not particularly necessary for things that become like this.

A cloth 20 is stretched inside the container 1 along the inner surface. In the figure, the cross section of the cloth is waved to make it clear where the cloth is stretched. This cloth 20 is fixed in places with bolts from inside the container. The cloth 20 is made of a material that has no fluff on its surface, is woven from smooth threads, and is breathable. An air outlet 21 is provided on the wall of the container, and a compressed air supply pump 22 is connected to the air outlet 21.
and valve 23 are connected. Compressed air supply pump 2
The compressed air from 2 is intermittently blown out from the air outlet 21 by opening and closing the valve 3. Compressed air blown out from the air outlet 21 is sent between the cloth 20 and the inner surface of the container 1, momentarily vibrating the cloth 20, and passing through the weave of the cloth 20 into the container 1. .

In this embodiment, there is only one air outlet 21, but
They may be provided at multiple locations.

The granular material 3 supplied into the container is crushed by a crusher 4,
The powder is transported through the container with hot air and dried, and is sent out as a dry powder from the upper end 12 of the container.

In the conventional powder drying apparatus, as mentioned above, the powder often adheres to the inner surface of the container. This was because the inner surface of the container was flat, so the contact area between the powder and the inner surface of the container was large, and the adhesion force was large. In the powder drying device according to the present invention, a cloth woven with smooth threads with no fluff on the surface is attached along the inner surface of the container. Since the surface of such a cloth has fine irregularities due to the texture, the contact area between the cloth surface and the powder is small, and the adhesion force is small. Furthermore, since the surface of the cloth is smooth and has no fuzz, powder particles will not get caught on the surface of the cloth. Therefore, adhesion of powder particles becomes less likely to occur. Moreover, even if
Even if a small amount of it adheres to the cloth, the cloth will prevent heat transfer from the container to the powder and granules, causing the powder to heat up and burn.

Further, in the above embodiment, the flexibility of the cloth is used to vibrate the cloth with compressed air to shake off the powder particles adhering to the cloth. Therefore, adhesion of powder and granules can be completely prevented.

However, it is not essential to blow air into the container, as long as the cloth is attached along the inner surface of the container. That is, in the above embodiment, it is sufficient that the cloth is fixed with bolts or the like from the inside of the container in places and stretched along the inner surface of the container. Further, a cloth may be attached so as to be in close contact with the inner surface of the container.

Smooth yarn with no fluff on its surface is generally obtained by spinning extremely long continuous fibers called long fibers. The cloth used in this invention must be woven with such threads. On the other hand, cloth woven from felt and short fibers has a lot of fluff on the cloth surface.
This is not preferable because the powder gets caught on the cloth surface. In particular, it is preferable that the cloth used in this invention be heat resistant, since the inside of the container may reach a high temperature. The thickness of the cloth thread is preferably about 0.01 to 11 cm in diameter. Furthermore, when blowing air into the fabric, it is necessary that the fabric has breathability.

Note that the powder drying apparatus according to the present invention is not limited to the above embodiment. As the supply means, a belt conveyor may be used instead of the screw conveyor, or a chute or the like that utilizes gravity may be used. The crusher may be one that blows air out of slits and uses the air force to crush the granular material. The cloth does not have to be attached to the entire inner surface of the container, but if it is attached partially, the powder tends to adhere to the inner surface of the container near the powder supply port, so it should be attached to that part. It's better.

〔Effect of the invention〕

As seen above, in the powder drying device according to the present invention, a cloth woven from smooth threads with no fluff on the surface is attached along the inner surface of the container for drying the powder. Therefore, the contact area between the cloth surface and the powder is small,
Adhesion is low. Further, the powder particles will not get caught on the cloth surface. Therefore, adhesion of powder and granules can be reduced. Furthermore, even if a small amount of the powder adheres to the cloth, the cloth prevents heat transfer from the container to the powder and granules, so the powder does not heat up and burn, resulting in high safety. Since there is less adhesion of powder and granules and the adhering powder and granules do not burn, cleaning inside the container, which was conventionally necessary, is no longer necessary.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of a powder drying device according to the present invention, and FIG. 2 is an enlarged perspective view of the same crusher. 1... Container 2... Powder 3... Supply means 4
... Crushing machine 10 ... Lower end of container 12 ... Upper end of container 17 ... Cloth 19 ... Compressed air supply pump agent Patent attorney Takehiko Matsumoto Figure 1, [°°・], 1 mm ζ÷ Figure 2

Claims (3)

[Claims] (1) A cylindrical container with both ends open and a supply means for supplying powder and granules into the container, and hot air flows into one end of the container and flows out together with the powder and granules from the other end. A granular material drying apparatus according to the present invention, characterized in that a cloth woven from smooth threads with no fluff on the surface is attached inside the container along the inner surface thereof. (2) The granular material drying apparatus according to claim 1, wherein a crusher for crushing the granular material supplied into the container is built in the container. (3) Claim 1, in which the cloth is breathable and means is provided for feeding compressed air between the cloth and the inner surface of the container.
The powder drying device according to item 1 or 2.