JP2006136800A - Flash crusher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the classifying capacity by enlarging the volume of the classifying area and making smooth the air flow from the second rotary vane to the discharge outlet through the classifying area to stabilize the classifying precision. <P>SOLUTION: In a flash crusher 1, the first rotary vane 11 and the second rotary vane 12 are arranged at a specified interval to form a revolving area in the rear of the first rotary vane 11 in a casing 10, a crushing area between the first rotary vane 11 and the second rotary vane 12 and a classifying area in the front of the second rotary vane 12 within the casing 10. The crusher 1 crushes and classifies a raw material by generating a revolving air flow through revolution of the first rotary vane 11 and the second rotary vane 12. The diameter of the boss 26 of the second rotary vane 12 decreases forward. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to the shape of a rotor blade of an airflow crusher used for crushing various raw materials such as agricultural products and minerals.

As a pulverizer for pulverizing various raw materials such as agricultural products and minerals, a pulverization region formed between the first and second rotor blades by rotating the first and second rotor blades in a casing There is an airflow type pulverizer that introduces raw materials into the raw material, pulverizes the raw materials by mutual friction, classifies them with an airflow, and collects products (see Patent Document 1).
As shown in FIG. 4, in the conventional airflow type pulverizer, the casing 40 is composed of a charging side casing 43, a center casing 44 and a discharging side casing 45, and inside the casing 40 is a charging side casing. The first rotary blade 41 and the second rotary blade 42 are attached to the front end (left end in FIG. 4) of the shaft 46 that penetrates 43 in a state of being separated from each other by a predetermined distance. The shaft 46 is rotatably supported by the frame 47 via a bearing (not shown). A motor (not shown) is provided at the rear end of the shaft 46 to give rotation to the shaft 46.

The center casing 44 has a cylindrical shape, and a swirl region is formed between the first rotary blade 41 and the charging-side casing 43, and a pulverization region is formed between the first rotary blade 41 and the second rotary blade 42.
The charging side casing 43 is provided with a raw material charging port 49 for charging the raw material in a direction perpendicular to the rotation shaft 46, and a taper wall 50 whose diameter gradually decreases toward the rear (on the right side in FIG. 4). The raw material supply port 51 is opened.
The discharge-side casing 45 has a tapered wall 52 whose diameter gradually decreases toward the front (on the left side in FIG. 4), and a discharge port 53 is opened at the front end. A suction fan (not shown) is connected to the discharge port 53 via a suction pipe.

The first rotary blade 41 and the second rotary blade 42 include bosses 55 and 56 having a diameter substantially equal to that of the discharge port 53. A plurality of blades 57 and 58 are provided radially around the bosses 55 and 56, and are rotated by the rotation of the shaft 46 to generate an airflow swirling in the casing 40. Note that the blades 57 of the first rotary blade 41 have a shape that generates an air flow that not only swirls but also thrusts forward to facilitate the introduction of the raw material from the swirl region to the pulverization region.
Here, the bosses 55 and 56 are for preventing the airflow of the suction fan from directly affecting the respective airflows in the swirl region and the crushing region.

The second rotary blade 42 is provided with an inclined surface 59 facing the tapered wall 52 of the discharge side casing 45 at the tip of the blade 58, and between the discharge side casing 45 and the second rotary blade 42 and in front thereof. A classification region is formed along the tapered wall 52.
The size of the clearance formed between the tapered wall 52 of the discharge side casing 45 and the inclined surface 59 of the second rotary blade 42 can be adjusted by changing the front and rear positions of the shaft 46.

In this airflow type pulverizer 31, the raw material charged from the raw material inlet 49 enters the casing 40 through the raw material supply port 51, and first swirls by the airflow swirling in the swirl region, and then radially outward by centrifugal force. A heading flow is given. On the other hand, the air in the casing 40 is sucked to the discharge port 53 side by the suction fan, and a differential pressure is generated between the swirl region and the pulverization region.
Due to the differential pressure and the forward thrust of the airflow generated by the first rotary blade 41, the raw material passes between the blades 57 of the first rotary blade 41 and enters the pulverization region, and is swirled by the airflow. Here, the larger the particle size, the larger the particle diameter, the larger the centrifugal force acts, and the material gathers on the outer peripheral side in the radial direction where the peripheral speed is faster, and is pulverized mainly by grinding of the particles.

Among the crushed materials, particles having a small particle diameter and a small mass gather near the rotation center of the second rotary blade 42 having a low pressure, and are sucked by the suction fan 2 and discharged from the discharge port 53 together with air. Particles having a large particle diameter and a large mass do not accompany the sucked air, and return to the pulverization region by a backward return airflow generated along the tapered wall 52 near the clearance.
In the classification area, the classification action is performed in this way. However, in the conventional airflow crusher 31, the volume of the classification area is regulated by the boss 56 of the second rotary blade 42. The classification amount was low. In addition, since the boss 56 has a square cross section in the axial direction, the airflow from the second rotary blade 42 through the classification region to the discharge port 23 is not smooth, and the swirling airflow in the classification region is disturbed. It was unstable.
JP 2000-61340 A

  An object of the present invention is to solve the above-mentioned problems in a conventional airflow fine pulverizer, and to provide an airflow pulverizer that increases the classification capacity by expanding the volume of the classification region. It is another object of the present invention to provide an airflow type pulverizer that can smooth the airflow from the second rotary blade through the classification region to the discharge port and stabilize the classification accuracy.

In the present invention, the first rotor blade and the second rotor blade are provided in the casing so as to be separated from each other by a predetermined distance, and the swirl region, the first rotor blade and the second rotor blade are disposed behind the first rotor blade in the casing. In the airflow type pulverizer that forms a pulverization region, a classification region in front of the second rotor blade, and generates a swirling airflow by the rotation of the first rotor blade and the second rotor blade to pulverize and classify the raw material, The above-mentioned problem is solved by making the bosses of the two rotor blades have a shape whose diameter decreases toward the front.
In the airflow type pulverizer of the present invention, the boss of the second rotary blade has a shape whose diameter decreases toward the front. As a result, the volume of the classification area is expanded, so that the classification ability is improved.
In addition, when the boss of the second rotary blade has a shape in which the diameter gradually decreases toward the front, the airflow from the second rotary blade to the discharge port through the classification region becomes smooth, so that the classification accuracy is stabilized.

  The airflow fine pulverizer of the present invention increases the classification capacity by expanding the volume of the classification region. Further, the airflow from the second rotary blade to the discharge port through the classification region can be smoothed, and the classification accuracy can be stabilized.

FIG. 1 is a block diagram of an airflow type pulverizer showing an embodiment of the present invention.
In the airflow type pulverizer 1, the casing 10 is composed of a charging side casing 13, a center casing 14, and a discharging side casing 15. Inside the casing 10, a shaft 16 penetrating the charging side casing 13 is provided. The first rotary blade 11 and the second rotary blade 12 are attached to the front end (left end in FIG. 1) in a state of being separated from each other by a predetermined distance. The shaft 16 is rotatably supported by the frame 17 via a bearing (not shown). A motor (not shown) is provided at the rear end of the shaft 16 to rotate the shaft 16.

The center casing 14 is cylindrical, and a swirl region is formed between the first rotary blade 11 and the charging side casing 13, and a pulverization region is formed between the first rotary blade 11 and the second rotary blade 12.
The charging casing 13 is provided with a raw material charging port 19 for charging the raw material in a direction perpendicular to the shaft 16. Further, a raw material supply port 21 is opened in a tapered wall 20 whose diameter gradually decreases toward the rear (upper right in FIG. 1).

The discharge-side casing 15 has a tapered wall 22 whose diameter gradually decreases toward the front (left side in FIG. 1), and a discharge port 23 is opened at the front end. A suction fan (not shown) is connected to the discharge port 23 via a suction pipe.
The first rotor blade 11 and the second rotor blade 12 are provided with a plurality of blades 27, 28 radially around the bosses 25, 26. The first rotor blade 11 and the second rotor blade 12 are rotated by the rotation of the shaft 16 and rotate in the casing 10. Cause it to occur.

The blades 27 of the first rotary blade 11 are shaped to generate an air flow that not only swirls but also thrusts forward to facilitate introduction of the raw material from the swirl region to the pulverization region. The boss 25 has a square vertical cross section in the axial direction.
The second rotary blade 12 is provided with an inclined surface 29 facing the tapered wall 22 of the discharge side casing 15 at the tip of the blade 28, and between the second rotary blade 12 and the discharge side casing 15 and in front thereof. A classification region is formed along the tapered wall 22.

The size of the clearance formed between the tapered wall 22 of the discharge side casing 15 and the inclined surface 29 of the second rotary blade 12 can be adjusted by changing the front and rear positions of the shaft 16.
The boss 26 of the second rotary blade 12 has a rear end that is the same diameter as the boss 25 of the first rotary blade 11 and has a shape in which the diameter decreases toward the front. The volume of the area is enlarged.

In this airflow type pulverizer 1, the raw material charged from the raw material charging port 19 enters the casing 10 through the raw material supply port 21, first swirled by the swirling airflow in the swirl region, and radially outward by centrifugal force. A heading flow is given. On the other hand, the air in the casing 10 is sucked toward the discharge port 23 by the suction fan, and a differential pressure is generated between the swirl region and the pulverization region.
Due to this differential pressure and the forward thrust of the airflow generated by the first rotary blade 11, the raw material passes between the blades 27 of the first rotary blade 11 and enters the pulverization region, and is swirled by the airflow. Here, the larger the particle size, the larger the particle diameter, the larger the centrifugal force acts, and the material gathers on the outer peripheral side in the radial direction where the peripheral speed is faster, and is pulverized mainly by grinding of the particles.

Among the crushed materials, particles having a small particle diameter and a small mass gather near the rotation center of the second rotary blade 12 having a low pressure, and are sucked by a suction fan and discharged together with air from the discharge port 23. Particles having a large particle diameter and a large mass do not accompany the sucked air, and return to the pulverization region by a return airflow generated along the tapered wall 22 while swirling in the vicinity of the clearance.
In the classification region, the classification action is performed in this way. Here, the boss 26 of the second rotary blade 12 has a shape in which the diameter decreases toward the front, thereby expanding the volume of the classification region. High classification ability can be obtained.
Accordingly, a pulverized product having a suitable particle size is efficiently produced.

2 and 3 are configuration diagrams of an airflow type pulverizer showing another embodiment of the present invention.
In the airflow-type pulverizer 1 of FIG. 2, the boss 26 of the second rotary blade 12 has a shape in which the diameter gradually decreases in an arc shape in the axial cross section toward the front.
In the airflow type pulverizer 1 of FIG. 3, the boss 26 of the second rotary blade 12 has a shape in which the diameter gradually decreases in a tapered shape toward the front.
Other configurations are the same as those of the airflow type pulverizer 1 of FIG.
These airflow type pulverizers 1 have a shape in which the bosses 26 of the second rotary blades 12 gradually decrease in diameter toward the front. For this reason, since the volume of the classification region is expanded, the classification capability is high, and the airflow from the second rotary blade 12 through the classification region to the discharge port 23 becomes smooth, so that the classification accuracy is stabilized. .
Accordingly, a pulverized product having a suitable particle size is more efficiently produced.

It is a block diagram of the airflow type | mold grinder which shows one Embodiment of this invention. It is a block diagram of the airflow-type crusher which shows other embodiment of this invention. It is a block diagram of the airflow-type crusher which shows other embodiment of this invention. It is a block diagram of the conventional airflow type crusher.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airflow type crusher 10 Casing 11 1st rotary blade 12 2nd rotary blade 13 Input side casing 14 Center casing 15 Discharge side casing 16 Shaft 17 Frame 19 Raw material input port 20 Tapered wall 21 Raw material supply port 22 Taper wall 23 Discharge port 25 26 Boss 27, 28 Blade 29 Inclined surface

Claims (2)

The first rotor blade and the second rotor blade are provided in the casing so as to be separated from each other by a predetermined distance, the swirl region is located behind the first rotor blade in the casing, and the pulverization region is between the first rotor blade and the second rotor blade. An airflow type pulverizer that forms a classification region in front of the second rotary blade, generates a swirling airflow by rotation of the first rotary blade and the second rotary blade, and pulverizes and classifies the raw material,
An airflow crusher characterized in that the boss of the second rotary blade has a shape with a diameter decreasing toward the front. The airflow type pulverizer according to claim 1, wherein the boss of the second rotary blade has a shape in which the diameter gradually decreases toward the front.

Images