JPH0319967Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to a rotary vane air classifier (hereinafter referred to as a classifier) that can efficiently classify powder.

b. Prior Art Classifiers have been widely used in the cement industry, steel industry, chemical industry, etc. since ancient times as important equipment for improving the efficiency of the entire crushing plant.

In conventional classifiers, in order to obtain products with the desired particle size from the raw materials fed into the classifier,
The amount of air passing or circulating inside the classifier and the rotation speed of the classifier blades were adjusted.

C. Problems that the invention aims to solve However, there was a drawback in that changing the air flow rate inevitably changed the processing capacity, making it impossible to efficiently obtain products with the desired particle size.

d Means for solving the problem The present invention provides a classifier that can efficiently obtain products with the desired particle size without changing processing capacity. The distance to the mounting plate of the classification rotor can be made variable by making the ceiling a movable top plate that can be moved up and down, or by attaching the mounting plate of the rotor to a rigid drive shaft that can be moved up and down. The main feature is the rotary vane air classifier.

The one shown in FIG. 1 is a specific example, in which the raw material for the classifier reaches the raw material distribution plate 4 from the raw material input port 1 via the raw material input chute 2. On the other hand, the raw material dispersion plate 4 and the classification blade mounting plate 6 are rotated by an electric motor via a driving vertical shaft 3. Therefore, the raw material is given centrifugal force by the rotation of the dispersion plate, and is thereby scattered toward the outer cylinder 5. At this time, the airflow rises from below the raw material distribution plate 4 through between the classification blade mounting plate 6 and the outer cylinder 5, so that the raw material is carried to the classification chamber 7 by riding the airflow here. The airflow carrying the raw material is given a swirl by the classification blades 8 driven through the classification blade attachment plate 6, and the coarse powder in the airflow collides with the inner wall of the outer cylinder 5 and absorbs the force from the airflow. The fine powder is lost and falls to the coarse powder collection cone 9 due to gravity, but the fine powder is carried out of the system through the inner cylinder 10 and the exhaust pipe 11 along with the airflow, and is collected by a bag filter or cyclone and becomes a product.

In the present invention, as shown in FIG. 1, a movable top plate 12 is supported by a movable top plate vertical shaft 13. The shaft 13 is arranged to be movable up and down by a motor cylinder 14. 15 is a metal bellows,
16 is a protection tube.

Now, when the shaft 13 is moved up and down by the motor cylinder 14, the distance between the movable top plate 12 and the classification blade mounting plate 6 changes, and therefore the distance between the classification blade mounting plate 6 and the movable top plate 12 changes. The cross-sectional area of the airflow passing inward at right angles changes. For this reason, the speed of the airflow passing through this, that is, the centripetal force acting on the particles changes, and the particle size of the fine powder can be changed as desired.

In this case, as a means for changing the cross-sectional area of the airflow, in addition to the method of raising and lowering the movable top plate as described above, the method of raising and lowering the classification blade 8 by raising and lowering the drive shaft 3 as shown in FIG. It's okay.

Using a centrifugal air classifier with a processing capacity of 30t/h,
By installing the movable top plate 12, the height h of the classification chamber was adjusted from the conventional 500 mm to 300 mm for classification. Although the processing capacity remained the same as before, the classification with the conventional classification chamber height of 500 mm was performed. Compared to when using a machine, the rate at which fine powder of the desired particle size mixes into the coarse powder side is reduced by approximately 6%.
I was able to reduce it.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the main parts of the classifier according to the present invention. 1...Raw material input port, 2...Raw material input chute,
3... Drive vertical shaft, 4... Raw material distribution plate, 5... Outer cylinder, 6... Classifying blade mounting plate, 7... Classifying chamber, 8...
Classifying blade, 9... Coarse powder collection cone, 10... Inner cylinder,
11...Exhaust pipe, 12...Movable top plate, 13...Movable top plate vertical axis, 14...Motor cylinder, 15
...Bellows, 16...Protective tube.

Claims (1)

[Scope of utility model registration request] The distance from the ceiling of the classification room to the mounting plate of the classification rotor can be changed by making the ceiling a movable top plate that can be moved up and down, or by attaching the mounting plate of the rotor to a drive shaft that can be moved up and down. A rotary vane type air classifier characterized by having the following configuration.