JPS5831971B2 - Pan type granulation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a granulator for stably obtaining homogeneous granules of a constant particle size.

Granulators are broadly divided into two types: those for granulating fine particles of 0.5 mm or less, and those for producing granules larger than that.

For the former, a spray drying type granulator, commonly known as a spray dryer, is used, and for the latter, a pan-type granulator, which is a type of transfer type, is mainly used.

This pan-type granulator includes a pan that rolls in an inclined state, a granular constant supply device that supplies powder to the pan, and a liquid supply device that supplies a liquid that gives binding force to the powder in the pan. The main components are:

Pan-type granulators have been used since ancient times due to their simple structure, low price, and small footprint.

However, in order to produce granules of a constant quality using a pan-type granulator, considerable skill is required, and there is a problem in that the quality deteriorates unless the operating conditions are adjusted once every 30 minutes.

The present invention solves this problem, and the pan-type granulation device of the present invention is provided with a vibrating sieve between the pan and the powder metering device, and the powder supplied to the pan is shaded on the vibrating sieve. This configuration enables stable granulation.

The pan-type granulator of the present invention will be explained with reference to an embodiment of the present invention shown in FIG.

This pan-type granulator has a structure in which a pan 1 tilted at approximately 48 degrees rotates at a constant speed clockwise as shown in Fig. It is continuously supplied to the lower right side of the pan 1 through the body supply pipe 21.

Due to the rotation of the pan 1, the powder in the pan 1 is sent from the bottom to the top along the side circumference of the pan 1, and further, while moving to the top and to the right due to the rotation of the pan 1, the powder in the pan 1 is moved due to the inclination of the pan 1. Fall from the top to the bottom.

In this way, the powder rotates around the lower left side of the pan 1.

A liquid serving as a binder for the powder is supplied in the form of a spray from the nozzle 31 of the liquid supply device 3 to the rotating portion of the powder.

As a result, as the raw material powder rotates at the lower left side of the pan 1, it grows into particles and increases in particle size.

Particles with a larger particle size have the property of rotating on the surface, and by utilizing this property and appropriately managing the supply of powder, the granulated powder that has grown to the desired particle size can be transferred to the side wall of the pan 1. 11 and take it out from the product outlet 4.

In this embodiment, a sieve 5 is provided at the lower part of the powder supply pipe 21, and the sieve 5 is fixed to a vibrator 51.
vibrate.

The powder supplied from the powder supply pipe 21 falls onto this sieve 5, and due to the vibration of the sieve 5, the powder is loosened into its original powder form and falls through the mesh of the sieve 5 into the pan 1, where it is supplied. be done.

Because of this vibrating sieve 5, the raw material powder is not supplied to the pass 1 in the form of lumps, and a large amount of powder is not supplied from the supply pipe 21 at one time.

For this reason, in this device, granulation is extremely stable and workability is greatly improved.

For example, ceramic powder with a particle size of 10 mμ is
When granulating 8TrtTn into granules, without the sieve 5, the yield between particle sizes 1 and 3 is approximately 90%, as shown by the white circles in Figure 2, and 30 minutes after the work retreats, the granules are Diameter 1~3rM
The yield of n begins to decrease.

On the other hand, when the vibrating sieve of this embodiment is provided,
As shown by the black circles in Figure 2, the yield of particles with a particle size of 1 to 3 mm is also about 9.
5%, and there is almost no decrease in yield with the passage of working time (and granulation is performed stably).

For this reason, with conventional pan-type granulators, one worker was always required to manage the granulator, but with the pan-type granulator of the present invention, an operator inspects the machine approximately every two hours. It just got better.

In this embodiment, the mesh of the sieve 5 is about 5 Nn on each side, but the mesh is not limited to this (from a thin mesh close to the particle size of the powder to a larger mesh). The vibrator 51 is used to prevent powder from accumulating on the sieve 5, and in this embodiment, a vibrator 51 with a frequency of approximately 8000 cycles/minute is used.
It is not limited to this.

In addition, a powder supply pipe 21 is provided to prevent scattering of powder.
It is also possible to integrate the sieve 5 by attaching it to the tip of the sieve 5.

Furthermore, in order to prevent powder from passing through the sieve 5, a skirt for preventing powder scattering may be provided at the bottom of the sieve 5.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a pan-type granulator according to an embodiment of the present invention;
FIG. 2 is a diagram showing the elapsed granulation time and the yield of granulated powder having a particle size of 1 to 3 rrrrrL. In the figure, reference numeral 1 indicates a pan, 2 a powder quantitative supply device, 3 a liquid supply device, 4 a product discharge port, and 5 a sieve.

Claims (1)

[Claims] 1. A pan that rolls in an inclined state, a powder quantitative supply device that supplies powder to the pan, and a liquid supply device that supplies a liquid that provides binding force to the powder in the pan. A pan-type granulation device comprising: a vibrating sieve is provided between the pan and the powder quantitative supply device, and the powder supplied to the pan is fed through the vibrating sieve. Device