JPS632213B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention: Field of the Invention The present invention relates to a granulation and coating device for powder and granules used in various chemicals, ferrites, powder metallurgy materials, ceramics, and the like.

Conventional technology A stirring blade that rotates close to the inner bottom of a cylindrical granulation chamber, a rotor that has many crushing blades protruding from its outer periphery and rotates in the center of the granulation chamber, and a stirring blade and rotor. A granulating apparatus equipped with a means for driving the rotation speed of each of the granulating chambers so as to be adjustable, and a means for supplying a binder solution from above into a granulating chamber is disclosed in Japanese Patent Application Laid-Open No. 57-209633.
It is shown in the publication No.

an upright container of circular cross-section, a stirring member arranged in the container on its bottom and driven in rotation about a vertical axis, and an air inlet and an air outlet in the lower and upper regions of said container, respectively. In this granulation device, two blades each having an exclusion surface inclined rearward and upward from the lower edge are arranged closely at the bottom of the container at the front in the rotational direction and serve as stirring members.
A granulating apparatus is disclosed in Japanese Patent Application Publication No. 2003-100000, which is configured to have one or more stirring members, and to be connected to an air inlet when the stirring member rotates, and to form an air introduction space without intervening granulated material contained in a container. It is shown in No. 52-62179.

Problems to be Solved by the Invention In the former case of the prior art, powder or granules during the granulation process are caught between the stirring blade that rotates close to the inner bottom of the granulation chamber and the inner bottom. There is a tendency to be crushed and crushed. At the same time, the stirring blade rotates the powder or granules in the granulation chamber and presses the powder or granules against the inner wall of the granulation chamber by the centrifugal force.
It is necessary to give the powder or granules the speed to rotate and revolve to form spherical granules,
Since the resistance of the powder or labor granules is large, a large driving force is required.

A similar tendency exists in the case of the latter stirring member of the prior art, and when powder to which water has been added is granulated with this granulator, the enlarged nodule-like granules are not broken down, so the resulting granules are The particle size distribution of the granules is uneven.

An object of the present invention is to eliminate the above-mentioned deficiencies and provide a granulation and coating device with uniform particle size distribution and good yield.

In so-called fluidized bed granulation, a liquid is sprayed onto powder to form a uniform mixed laminar flow of powder and liquid, and the liquid is increased to perform granulation. In order to granulate a product with a uniform particle size distribution, it is necessary to make the size of the sprayed droplets uniformly small and to mix them together with the powder uniformly as a whole. Fluidized bed granulation involves the trouble of having to carefully control the conditions as described above.

In the present invention, when adding liquid for granulation, even if the powder material is moistened by showering or by adding the necessary amount of liquid at once, without using a spray, the powder material is uniformly stirred and mixed by a high-speed crushing rotor, and then the powder material is quickly mixed. It is an object of the present invention to provide a granulation and coating device that can perform granulation with high bulk density in a short amount of time.

Means for Solving the Constituent Problems of the Invention One or more ascending slopes inclined upward in a direction opposite to the rotation direction are formed in a radial manner, and a large number of pores are arranged in the rear end wall of the ascending slope. A rotating body having a rotary plate superimposed on the lower surface of the plate and provided with an air inlet opening into the space below the ascending slope is positioned below the upright cylindrical container and fixed on the first drive shaft, and the above-mentioned A gas pressure inlet is provided in the cylindrical container below the rotating body, and a crushing rotor having protrusions arranged around the circumference is positioned above the center of the rotating body, and is fixed on the second drive shaft.

A material input port and a spray nozzle are provided in the upper part of the cylindrical container, and a product outlet port is provided in the wall of the cylindrical container at a position corresponding to the top surface of the rotating body. If necessary, a bag filter is provided at the top of the cylindrical container.

A pipe from a blower with a heater provided in the middle is connected to the gas pressure inlet.

A lattice pattern is formed on the ascending slope and the flat surface of the disk.
The uneven surface is provided in a dotted, wavy or other arbitrary shape and arrangement.

Function: Powder or granules of one or more kinds of predetermined materials put into the cylindrical container are driven upward and radially by the ascending slope of the rotating body rotating by the first drive shaft, and are moved inside the cylindrical container. rotate. In addition to these movements, centrifugal force acts, so the powder or granules to be treated create a donut-shaped swirling flow along the inner circumference of the cylindrical container. Due to this action, mixing is completed in a short time, and granulation can begin when liquid is added by spraying. The swirling flow includes movement of the material to be processed, which is driven by the ascending slope of the disk and moves up the inner wall of the cylindrical container from the periphery of the disk due to the centrifugal force, and then falls toward the center of the container. .

Therefore, the crushing rotor, which is being rotated by the second drive shaft, applies an impact to the high-speed protrusion of the crushing rotor on the material to be processed that falls spirally into the center of the swirling flow, that is, the center of the container. , accelerates granulation while crushing excessive granules generated in the material to be treated during the granulation process.

Pressure gas is introduced into the lower part of the cylindrical container, and the gas passes through the air inlet of the rotating plate and the closed space at the bottom of the ascending slope, blows out from the pores on the rear end wall of the ascending slope, and diffuses into the material to be treated. be done. The pressurized gas prevents the material to be treated from falling through the gap between the inner wall of the container and the periphery of the rotating body.

The uneven surfaces provided on the plane and the ascending slope of the disk act to cause the particles to rotate and revolve.

Embodiment In the figure, 1 is a cylindrical container, 2 is a disc, 3 is an ascending slope, 4 is a rear end wall of the ascending slope, 5 is an air hole provided in the rear end wall, and 6 is a container heavily attached to the lower part of the disc. The rotary plate 7 is an air guide port provided on the rotary plate.
The rotary plate 6 is a first rotary plate bearing a lower part of the rotary container.
is fixed on the drive shaft 8 of. The drive shaft 8 is a cylindrical shaft. 10 is an uneven surface formed on the ascending slope.

11 is a crushing rotor, around which protrusions 12 are arranged. In addition to the projecting piece 12, a pin 13 slightly longer than this may be provided. The crushing rotor may have a truncated cone shape, or may have a cylindrical body with protrusions 14 arranged thereon, as shown in FIGS. 5 and 6, or a continuous protrusion 15 in the shape of spiral teeth. Crushing rotor 11
is fixed on the second drive shaft 17 and rotated at high speed. 18 indicates a bearing.

20 is a pressure gas inlet provided at the bottom of the cylindrical container, 21 is a blower, and 22 is a heater. 23 is a product outlet, and 24 is its lid.

As the liquid spray 25 for granulation, a two-fluid nozzle that mixes air and liquid and sprays the mixture is used. 2
6 is a material input hopper, 27 is its valve, and 28 is a bag filter, which is a cylinder opening 3 provided on the top cover 29 of the container 1.
It is attached to 0.

When drying the product after granulation, crushing rotor 1
1 is stopped, the rotation speed of the rotary plate 6 is lowered,
By using the heater 22 and blowing hot air, each part of the product is evenly dried.

When coating a product, spray the coating solution and dry it once or several times.

In the above configuration, the radial end of the ascending slope of the disk 2 is formed into a slope 9 that descends toward the periphery of the rotary plate 6, and this portion also pushes the material to be processed along the inner periphery of the cylindrical container 1. It has the effect of raising

The periphery of the disc 2 is joined or rolled up to be integrated with the periphery of the rotary plate 6.

Effects In the present invention, the material to be treated is evenly pushed up by the ascending slope 3 of the disk 2 in the cylindrical container 1, and immediately after that is exposed to the gas ejected from the many pores 5, so that the particles are not granulated. is promoted. On the inner periphery of the swirling flow of the material revolving along the inner periphery of the cylindrical container 1, the material is stirred and crushed by the high-speed crushing rotor 11, and granulation is promoted. Since drying during coating is efficiently carried out by the disk 2, the amount of air used can be small, and depending on the material to be treated, granulation efficiency and coating efficiency can be obtained that are 2 to 4 times higher than conventional devices.

An example of device dimensions, rotation speed, etc. is shown below.

Inner diameter of cylindrical container 400mm Rotating plate rotation speed 100R/M~500R/M Crushing rotor protrusion tip circle 140mm Crushing rotor rotation speed 1000R/M~5000R/M Test materials bentonite and talc Added water 12% WB Input amount 16 (apparent specific gravity≒0.7Kg/) =11.2Kg Time required for mixing: 3 minutes Time required for granulation: 8 minutes Product particle size distribution 0.1mm~0.5mm (diameter) Yield 0.2mm~0.4mm 85%

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view of the device of the present invention, and Figure 2A
- Shows a longitudinal section along line A. Figure 2 is a plan view of the rotating body, Figure 3 is a longitudinal front view taken along line A-A in Figure 2, Figure 4 is a partial sectional view, and Figures 5 and 6 are slope views of the crushing rotor. It is. 1... Cylindrical container, 2... Disc, 3... Rising slope, 4...
Rear end wall, 5... air hole, 6... rotating plate, 7... air guide port, 8
...First drive shaft, 11...Crushing rotor, 12...Protrusion piece, 17...Second drive shaft.

Claims (1)

[Claims] 1. One or more ascending slopes radially inclined upward in a direction opposite to the direction of rotation, and a plurality of pores arranged on the rear end wall of the ascending slopes on the lower surface of the disk. A rotating body in which rotating plates are overlapped and air inlets for the air holes are provided at the lower part of the ascending slope is positioned below the upright cylindrical container and fixed on the first drive shaft, A granulation and coating device in which the container is provided with a gas pressure inlet, and a crushing rotor having protrusions arranged around the upper center of the rotating body is positioned and fixed on a second drive shaft. 2. The granulation and coating device according to claim 1, wherein the air inlet is opened in a closed space below the ascending slope. 3. The granulation and coating device according to claim 1, wherein an uneven surface is formed on the ascending slope. 4. The granulation and coating apparatus according to claim 1, wherein the first drive shaft is a low-speed rotation shaft and the second rotation shaft is a high-speed rotation shaft. 5. The granulation and coating apparatus according to claim 1, wherein a heater and a blower are connected to the gas pressure inlet. 6. The granulation and coating device according to claim 1, wherein a liquid spray nozzle is provided in the upper part of the cylindrical container.