JPS6097038A - Drum granulator - Google Patents

Abstract

PURPOSE:To enable granulation imparting a uniform particle size, by providing a plurality of lift blades slowly rising toward the reverse rotary direction of a rotary drum along the inner peripheral surface of the drum in a protruded state while bringing the heights of the lift blades to specific relation. CONSTITUTION:A plurality of lift blades 4 slowly rising toward the reverse rotary direction of a rotary drum 3 having a powder charging port 2 and a granule emitting port 3 are provided to the inner peripheral surface of the drum 3 and the height (h) of each lift blade 4 is set so as to satisfy the relation of 5d<h<(1/10)D between the diameter D of the drum and an objective particle size (d). As a result, granulation can be performed efficiently so as to obtain a uniform objective particle size without forming a coarse particle. Desirably, the height (h) of each blade 4 is pref. about 0.05D. Furthermore, granulation capacity per one granulator is about 10-20ton/hr and a treating speed of 2-4 times is obtained as compared with a pan type granulator while a granulation time can be prolonged by 5-20 times and treating capacity can be enhanced to a large extent.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machine for multiple granulation of granules from powder.

A pan-type granulator is known as a conventional granulator, but this granulator feeds powder while adding water to form granules. The granulation efficiency is rapid, and the granulation capacity per IIh is about 4 to 5 tons/hour for the large-scale type, and the granulation time is short.
Furthermore, there were drawbacks such as increased construction and power costs. The present invention aims to provide a drum granulator of a new concept that overcomes these drawbacks.

This invention has a powder inlet (1) and a granulated material outlet (2).
Lift blades (4) that smoothly rise along the inner circumference of the co-rotating drum (3) in accordance with the counter-rotational force 1- of the drum
) are provided protrudingly, and the relationship between the diameter of the rotating drum (3) and the target particle diameter d is satisfied. Granulator-ζ
be. In the same figure (phrase is l1iJ drying chamber, (6) is - soft part moving roller, (7) is motor, (8) is transmission chain, (
9) is on the left In this invention, powder such as culture soil or riIII wet powder is fed into the rotating drum (st) from the inlet (1). The kneading drum (31 yen) is supported by the lift blades (4) which are provided with protruding ridges and rotates while attached to the parapet wall, but it cannot attach to the inner circumferential wall of the rotating drum (3) beyond a certain angle. The powder slides downward.The powder that has slipped is granulated together with the powder below and rotates with the rotating drum (3), and when it turns I+11 to a certain angle, it slides into the direction ball.In this repeated process, the powder is granulated. This granulation process is complicated. The powder skin on the inner peripheral wall of the rotating drum (3) is divided into three layers, and the bottom layer (a) is granulated in the direction of rotation by lift vanes (4). The raw material is conveyed while being pressurized from the upper part, and at this time, the powder raw material is bonded and aggregated ((Information fa in Figure 4) and Figure 5 (A)).
, (b) Station Teru),.

Next, in the middle layer tbl, the bottom layer (
The flow direction of a) and upper Ill (C) are reversed.While the high school is rolled, the hairstyle is shaped into a round shape, causing an effect similar to the barrel effect (+bl in the 4th figure and 5th figure). Cause (c) reference.

Furthermore, the material is granulated to the extent that it can fit into the upper layer tel, and while it is further rolled, it is granulated to a uniform particle size and serves as the return section for the raw material. The powder and particles in this process are granulated into particles with a uniform particle size through a process in each layer.

Here, when the water in the powder is collected by the lift vane at (4), it is gradually granulated by the cross-stripe force at -1id fill and is used on the surface of the grains. Granulation is the oil used. Furthermore, the group school uniform is broken by the collision with the base of the lift blade (4), and becomes m-grained material, thereby preventing formation of coarse grained salary. The fifth evil (a) to (e) are particle f
This shows the iL calibration process, where (a) is the state of the powder raw material, (b) is the state where the granules adhere to each other due to pressure and become aggregated, and C field is the state where the granules are assimilated into each other. In the granulated state, -) is a state in which small granules adhere to the surface of the granulated granules, and in middle) is a state in which large granules and small granules are assimilated to form even larger particles.

Here, the lift blade (4) moves at an acute angle inside the rotating drum (3)! If it is provided protruding from 1 lll, the granulated material will be suspended, the upward sliding phenomenon will be reduced, and granulation will be difficult. Also, if the height h of the lift blade & (4) is too small, the effect of the blade will be lost and the granulated material will slide as it is with the rotation of the rotating drum (3) and the granulation effect will be lost (Figure 6 Yumesho). Also, if the height of the lift blade (4) is too high, the powder of the lift blade (4) will not move even if the rotating drum (3J) rotates once, and will collapse when it rotates again, resulting in granulation. It is difficult to do (see No. 71, m).

In the present invention, by setting the length of the lift blade (4) to a diameter of 1):[i11], the above-mentioned granulation occurred and the granulation was completed to a particle size of q-. Desirably, the performance was good.

As described above, according to the present invention, the above-mentioned excellent effects could be achieved.

(b) There are no coarse particles and it is possible to efficiently obtain a uniform particle size of the target particle size.

(b) It has a processing speed of 2 to 4 times that of a pan-type granulator, with a capacity of 10 to 20 tons per hour, and a granulation time of 5 to 20 tons per hour. It is possible to greatly increase the processing power.

(c) High water content powder can be granulated without drying in the previous stage.

2) The power and equipment costs are only about a fraction of the cost of a single machine.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an example of drum granulation according to the present invention, Fig. 2 is a sectional view taken along line 1-I in Fig. 1, and Fig. 8 is a sectional view taken along line ■-■ in Fig. 1. , Figure 4 is a perspective view showing the state of the powder in the rotating drum, Figure 6 is in the explanation showing the granulation process, and Figure 6 is the state of the powder when the height of the lift blade is too low. FIG. 7 is an explanation 1 showing the state of the powder when the rope of the lift blade is too high. (1) Two-way entrance (2): Granule discharge port (3) Two-rotation drum (4): Lift vane Patent applicant: Shunko Agata Shiki Company Agent: Ministry of Toshima, Department 4

Claims (1)

[Scope of Claims] l) Along the inward outer periphery of the single-rotation drum (3) having a powder inlet (1) and a powder outlet (2) toward the counter-rotational force III of the drum; Lift wing 1 that goes up gently! IL
At the same time as removing the lift blade (4),
A drum granulator characterized in that the relationship between the diameter of the rotating drum (8) and the critical particle diameter d is satisfied.