JPH035216B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an air classifier for powder and granular materials that can be applied to large-capacity classification under low static pressure.

(Prior Art) The above-mentioned wind classifier is disclosed in the inventor's previous patent application No. 58-134415. The object of the previous invention is to disperse the agglomeration of fine powder in powder and granules and to classify the fine powder more efficiently than coexisting coarse particles by means of a wire mesh tube arranged inside a processing tube with a specific configuration.

(Object of the Invention) The present invention has been made with the aim of improving the previous invention and classifying and collecting powder particles to a specified particle size with higher accuracy.

(Structure of the Invention) The structure of the present invention will be explained based on the drawings. Fig. 1 is a rear view of the air classifier for powder and granular materials of the present invention, Fig. 2 is a front view of the center longitudinal section, and Fig. 3 is a front view. .

In the drawings, reference numeral 1 denotes a horizontally cylindrical base cylinder, and a tangential inflow pipe 2 is attached to the outside of the cylinder, and a slide damper 3 is attached to a part of the pipe so that it can be moved diagonally forward and backward into the pipe.
will be established.

6 is a high-pressure air jet pipe housed inside the base cylinder,
A jet head 7 is provided at the rear end to jet high-pressure air radially outward.

Reference numeral 11 denotes an annular rotating flow generating section provided at the rear of the base cylinder.A discharge section hopper 12 is attached to the lower outside of this section, and a conical receiving tube 13 is connected to the rear of the section. The front end is opposed to the outer side of the rear end of the base cylinder 1 via an annular gap 14, and an exhaust port 15 is provided at the rear end.

16 is a particle cutting cylinder attached to the inlet of the exhaust port and arranged so that its front part can be moved forward and backward into the receiving cylinder; 17 is a pressure relief cylinder provided between the hopper 12 and the center of the base cylinder 1; Showing the tube.

Note that 21 in the figure indicates a valve of the high-pressure air receiving section.

(Function) When an airflow containing powder and granules flows into the cylinder 1 from the inflow pipe 1, it becomes a turbulent flow and travels inside the base cylinder 1, dispersing the powder and granules in the airflow to the inner wall of the cylinder. If the valve 21 is simultaneously opened to discharge high-pressure air radially outward from the jet head 7 of the high-pressure air discharge pipe 6, the above-mentioned dispersion is further promoted.

Particles within a certain particle size range separated on the inner wall of the base cylinder 1 fall into the hopper 12 through the annular gap 14, and are facilitated to fall into the hopper by the action of the pressure release pipe 17 connected to the central low-pressure part of the base cylinder 1. 12. The airflow containing unseparated fine powder is sent to receiver 1.
The dust passes through the center of the dust collector 3 and is sent to another classifier connected through the exhaust port 15, where it is further classified, and finally collected into extremely fine powder by an electrostatic precipitator or the like.

While the above series of actions are being carried out, the inflow pipe 2
By sliding the damper 3, the flow rate can be adjusted to set the particle classification position, and the separation accuracy can be improved by finely adjusting the movement of the particle cutting cylinder 16 into the receiving tube 13. .

(Effects of the Invention) The classifier of the present invention has no ventilation blockers such as filters inside the machine and can function only by airflow action, so it can classify powder particles in a large volume of airflow under relatively low pressure. Since it is possible to classify with high precision, when using other classifiers together, the subsequent classifier can be sent only the smaller diameter particles that the present invention machine could not collect, and the fine powder particles can be collected in an intensive manner. There are other effects.

[Brief explanation of drawings]

FIG. 1 is a rear view of the air classifier for powder and granular materials of the present invention, FIG. 2 is a front view in longitudinal section at the center, and FIG. 3 is a front view. 1: base cylinder, 2: inflow pipe, 3: slide damper, 6: high pressure air jet pipe, 11: rotating flow generator,
12: Hopper, 13: Receiver, 16: Cylinder for particle cutting, 17: Pressure relief pipe.

Claims (1)

[Claims] 1. A rotary flow generating section, an annular dust collection section, and a dust collection hopper are installed in sequence at the rear of a base cylinder that has a tangential inflow pipe installed on the outside and a high-pressure air jet pipe accommodated inside, and the hopper and the base cylinder are installed in sequence. In a classifier that has a pressure relief pipe between it and the center, a slide damper is installed in a part of the inflow pipe so that it can be moved diagonally forward and backward into the pipe, and a conical receiver is connected to the rear of the rotating flow generating part. An air classifier for powder and granular materials, comprising a cylinder for cutting particles, which is provided in the middle part of the receiving cylinder and can be advanced and retreated into the cylinder concentrically with the receiving cylinder.