JPS6316979B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air flow type pulverizer, and more particularly, to a swirl flow type pulverizer that performs pulverization and classification using a swirling air flow in a single pulverization chamber.

A pulverizer that uses fluid energy to pulverize granular material is known and used for ultrafine pulverization. On the other hand, this pulverizer is also well known for its low pulverizing capacity relative to the required power, and the problem has been how to improve the pulverizing efficiency. In addition, in order to obtain the desired amount of product, the crushing equipment tends to be extremely large in size because it must be connected to a classifier to compensate for the low crushing capacity of the crusher.

In view of these points, the present invention aims first to improve the pulverization efficiency, thereby downsizing the pulverizer itself and reducing operating costs.

The configuration is a rotating air flow type crusher, which is equipped with a fine powder outlet in the center and an injection nozzle on the inner peripheral wall that injects powder and granular material (hereinafter simply referred to as material) together with pressurized air. The collision surface of the collision member, which corresponds to the injection nozzle and is disposed at an appropriate distance from the inner peripheral wall surface, is inclined in the outer peripheral direction, and an opening is formed in a part of the inner peripheral wall surface, A path is configured to communicate the opening and the injection nozzle.

The present invention will be explained below by way of examples. 1st
In Figures to Figures 3, the casing 3 of the crusher 1
is an upper disk 4 having a fine powder discharge port 7 at the upper center.
A grinding chamber 2 is constituted by a lower disk 5 having a conical straightening member 8 facing upward in the center thereof, and an inner circumferential wall surface 4 forming a hemispherical or U-shaped cross section. . On the other hand, in the crushing chamber 2, an injection nozzle 10 is disposed to penetrate through the inner circumferential wall surface 4 slightly toward the center of the inner circumferential wall surface 4 than in a tangential direction of the inner circumferential wall surface 4. Collision member 9 corresponds to the tip of outlet 11 with a slight gap.
are being set up. The collision surface a corresponding to the jet nozzle 11 of the collision member 9 is heat-treated or coated with a super hard material to improve wear resistance, and is also slightly inclined in the outer circumferential direction and positioned at an appropriate distance from the inner circumferential wall surface 6. It is set up to maintain. Note that the collision member 9
The shape and material of the collision member 9 can be changed in various ways, and it is also possible to configure the polygonal collision member 9 so that each side of the collision member 9 is moved sequentially. Next, the injection nozzle 6 connects a compressed air pipe 12 connected to a compressed air source 17, a raw material inlet 14 connected to a feeder 18, and a coarse particle inlet 15 for introducing coarse powder particles to a classifier 19, which will be described later, into an ejector. In addition to the ejection pipe 13 provided in section b, an acceleration section l is provided between the ejection port 11 and the tip of the compressed air pipe 12 for accelerating the material. Further, an opening 16 is formed in a part of the inner circumferential wall surface 6 so as to be separated from the collision member, and the opening 16 has a communication pipe 20 as a path for communicating the injection nozzle 10 with the injection nozzle 10. connected via. In addition, in the present invention, the position of the opening 16 is provided in the tangential direction, but the position is not limited to this. 21 is a collector. Reference numeral 22 is a screw that allows the upper disk 4, which is a part of the grinding chamber 2, to be adjusted up and down. By doing this, the classified particle size can be adjusted. In addition to disposing a plurality of injection nozzles 10 and collision members 9 in the crushing chamber 2,
Apart from this, it is also possible to introduce a structure in which compressed air is introduced to improve both the crushing and classification functions.

Next, we will discuss the effect. The material input from the raw material inlet 14 by the feeder 18 is injected at high speed from the jet nozzle 11 by the jet nozzle 10 together with high-pressure air from the compressed air source 17, and collides with the collision member 9 disposed in the crushing chamber 2. I am made to do so. Note that, after the material particles are accelerated to a sufficient speed in the particle acceleration section l provided in the injection nozzle 10, they are made to collide with the collision surface a of the collision member 9, so that the material particles are Shattered. In addition to the pulverizing action caused by the impact with the collision member 9, the material particles also undergo pulverizing action due to collisions and contact between the particles within the acceleration section 1 provided in the injection nozzle 10, and as they swirl into the pulverizing chamber 2. I will also receive it. On the other hand, particles that bounce off the collision surface a may damage the jet nozzle 11 or cause damage to the jet nozzle 11 because the collision surface a is arranged with a slight inclination toward the outer circumferential direction with respect to the jet nozzle 10. The jet flow j from 11 is merged with the swirl flow r flowing along the inner circumferential wall surface 6 without disturbing it. Then, the particles pulverized at this time are discharged outside the machine from the fine powder outlet 7 at the upper center of the crushing chamber 2 and transferred to the classifier 18. On the other hand, some of the coarse particles in the swirling flow r are taken out of the grinding chamber 2 through the opening 16 formed in a part of the inner peripheral wall surface 6, and are taken out from the raw material inlet 14 through the communication pipe 20. Spray nozzle 10 again with new material
is injected into the crushing chamber 2 by the pulverizer, and is given the above-mentioned crushing action. The particles thus pulverized by repeated pulverization are sent to the classifier 19 through the pulverizer outlet 7, as described above. After being classified by the classifier 19, the fine powder is collected by the collector 21, and the coarse powder is taken out of the machine, it is introduced into the coarse particle inlet 15 provided in the ejector part b, The above-mentioned pulverizing action is applied again within the pulverizing chamber 2. Note that the amount extracted from the opening 16 varies depending on the opening area of the opening 16, the opening direction, and the position, and can also be adjusted by adjusting the pressure inside the communication pipe 20. A regulating valve may be provided in a part of the pipe 20.

As described above, according to the present invention, by communicating the grinding chamber 2 and the injection nozzle 10 through the communication pipe 20, coarse particles in the swirling flow r in the grinding chamber 2 are separately added to the outside of the machine. The circulation path for alternately and repeatedly applying both the crushing and classifying actions by directly transferring the material to the injection nozzle 10 without using any other means is significantly shortened, and moreover, the effective crushing action is achieved by the arrangement of the collision member 9. Together, this makes it possible to downsize the crushing device itself. Furthermore, the effects of the present invention are significant, such as improved crushing performance and reduced operating costs of the device due to its miniaturization, as well as a reduction in the manufacturing cost of the device itself.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the present invention, FIG. 2 is a sectional view of essential parts, and FIG. 3 is a sectional view taken along line A-A' in FIG. In the figure, 1...Crusher, 2...Crushing chamber, 6...
...Inner peripheral wall surface, 9...Collision member, 10...Injection nozzle, 16...Open hole, 20...Communication pipe.

Claims (1)

[Claims] 1 Injection nozzle 1 having a fine powder discharge port 7 in the center and injecting powder and granular material together with pressurized air onto the inner peripheral wall surface 6
0, which corresponds to the injection nozzle 10 and has an inner circumferential wall surface 6.
In addition to tilting the collision surface a of the collision member 9 disposed at an appropriate distance from the collision member 9 in the outer circumferential direction, an aperture 16 is formed in a part of the inner peripheral wall surface 6, and the aperture 16 and the injection nozzle 10 An air flow type crusher characterized by comprising a path that communicates with the air flow type crusher.