JPS5966362A - Ultra-finely crushing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrafine pulverizer for pulverizing particles of a material to be pulverized into ultrafine particles on the order of several microns.

Conventionally, the particles of the material to be crushed have been pulverized using a high-speed rotational impact type vertical crusher, a jet mill, or a pulverization equipment using a combination of both.

The mold crusher has a cylindrical rotor having a large number of protrusions along the generatrix of the outer surface supported on a vertical rotating shaft, and a fixed gap between the cylindrical rotor and the inner surface. A stator having a large number of convex portions is fitted along the generatrix of the rotor, and the material to be crushed is supplied to the gap between the cylindrical rotor and the stator, and the cylindrical rotor is rotated at high speed. The material to be crushed is crushed by this method.

In the process of crushing the material to be crushed, the material to be crushed is supplied into the annular gap between the cylindrical rotor and the stator from a supply port provided below the grinder, and the cylindrical material is rotated at high speed. Due to the rotational force of the cylindrical rotor, the heel is crushed, and the heel is crushed due to the upward spiral airflow inside the annular gap created by the rotation of the cylindrical rotor. The crushed product is then discharged as a pulverized product through a discharge port located above the casing.

In a vertical crusher that uses this type of crushing process, once the material to be crushed has been crushed to a certain extent, the annular gap will form.

The pulverized product also rotates along with the cylindrical rotor riding the upward spiral airflow in the gap.1. 9. The peripheral speed of the cylindrical rotor and the crushed product. As the relative velocity between the
It is impossible to obtain.

Jet mills pass compressed air or high-temperature steam through a nozzle installed in the grinding chamber, convert it into velocity energy, create a trajectory of high-speed airflow, and continuously transport the powder and granules to be ground into this supersonic jet stream. Moreover, by automatically supplying the powder and pulverizing it by generating strong impact and friction, it is possible to obtain ultrafine powder on the order of several microns.

Sono However, when the particle size of the granular material that is the material to be crushed becomes large, the processing capacity will be extremely reduced, and as a result, the α-bow unit will be insufficient to process the material to be crushed: i・□kp. Power consumption per drive KW f”h/hp (depending on the type of material to be crushed and the size of the mill, but generally 1 to 4 KW)
-h/. ) increases. ,.

Furthermore, the fine grinding equipment in which the vertical grinder, the diene mill, and the mill are installed separately is simply a combination of the vertical grinder, the chef 1-mill, and the mill using air conveyance equipment, etc., and the fine grinding process is According to Figure 1, d) Ancient and Ming Dynasty: Then, the material to be crushed is fed to the vertical crusher 1, and the crushed material is crushed.
The pulverized product is air-transported to the bag filter 3 through the exhaust pipe 24 by the drive of the exhaust fan 4, where the air and the pulverized product are separated, and the air is exhausted from the exhaust pipe 5 through the exhaust fan 4, and the pulverized product is It is temporarily stored in the hopper 6. The pulverized product in the hopper 6 is sent to a transport pipe 8 by a feeder 7, and is pneumatically transported through the transport pipe 8 to a bag filter 9 by the drive of an exhaust fan 10 provided at a separate position. Air and the pulverized product are separated, the air is exhausted from the exhaust pipe 11 through the exhaust fan 1o, and the pulverized product is temporarily stored in the hopper 12. The pulverized product in this hopper 12 is fed to the jet mill 4 by a feeder 13,
It is pulverized by a jet of compressed air.

The air is then transported to the bag filter 16 through the drive transport pipe 15 of the exhaust fan 17, where the air and the finely pulverized product are separated, and the air passes through the exhaust pipe 18 through the exhaust air a17.
It is exhausted from the □, and the finely pulverized product is stored in the hopper 19 □
1. In this type of equipment where the material to be crushed is first crushed in the vertical crusher 1 and then finely crushed in the jet mill 14, the pneumatic transportation equipment is very important. Became a Gakashi, 1.・It's not just that the equipment costs and operating costs are huge, but that a huge amount of effort and time is spent on maintenance, inspection, maintenance, etc.

The present invention has been developed in view of the above circumstances, and has low equipment costs and operating costs, easy maintenance, easy inspection and maintenance, and is efficient in converting materials to be crushed into ultra-fine powder on the order of several microns. This article represents an ultra-fine grinder that can finely grind particles into fine particles.・ : 1□
□ □Hereinafter, one embodiment of the ultrafine crusher according to the present invention will be described with reference to FIGS. 2 to 5. Reference numeral 20 represents a cylindrical rotor, and bearing 21. □22 is supported by a vertical rotating shaft 24'61 which is rotatably supported by 1-i2a. The row side surface of the rotor '20' has its generatrix (
A large number of six parts 5' are carved along C to form an uneven surface. A centrifugal blade 27 is provided on the outer part of the upper end plate 26 of the rotation-Fh A stirring blade 3'0 is provided. Reference numeral 31 denotes a stator that is fitted with a certain gap 32 between the rotor 20' and the stator, and the inner surface of the stator is provided with a large number of convex portions 33 along the generatrix line to form an uneven surface. It is formed.

At the upper end of the stator 31, an inverted conical casing 34 is provided higher than the grinding chamber disk 28, corresponding to the centrifugal blades 27. At the upper end of the inverted conical casing 34, there is provided a jet ring 37 of a jet mill 36, in which six jet nozzles 35 are equally spaced and directed toward the center in the tangential direction. ] A casing upper lid 39 having a diameter of 38 is provided between the grinding chamber disc 28 and the grinding chamber 4 of the jet mill 36.
0 is formed. An annular compressed air distribution pipe 4]2 of the jet mill 36 is provided on the outer peripheral side of the jet ring 37 and communicates with the jet nozzle 35. 42 is a compressed air inlet 10 of the compressed air distribution pipe 41. An inverted conical lower casing 43 connected to the lower end of the fixing-0r-31 is provided so as to cover the stirring blade 30, and a ground material supply [] 44 which also serves as an air inlet is provided on the lower surface of this lower casing 43. The lower casing 43 is operated by the air current generated by the rotation of the agitating blades 30 through the pulverized material supply port 44, which is a wind box for introducing the pulverized material into the gap 32 between the rotor 20 and the stator 31. It has become impossible to fulfill its role. 45 is a pulley fixed to the lower end of the vertical rotating shaft 24, and 46 is a drive belt, which is connected to a pulley (not shown) on the rotating shaft of the electric motor and the pulley 45. .

Although not shown, a discharge pipe is connected to the product discharge port 38, a bag filter is provided to this, and an exhaust pipe with an exhaust fan and a hopper are connected to the bag filter. A compressor is installed in the

Next, the operation of the ultrafine pulverizer of the present invention constructed as described above will be explained. First, a blower (not shown) is operated to draw in air from the material supply port 44 on the lower surface of the lower casing 43 (7), and a compressor attached to the jet mill 36 is driven to supply compressed air to the compressed air inlet 42. 6 of the jet ring 37.
The air flow inside the ultrafine pulverizer will be described when the rotor 20 is rotated at high speed by the drive belt 46 by injecting air from the jet nozzles 35, driving an electric motor (not shown), and rotating the rotor 20 at high speed.

The material to be crushed is sucked from the supply port 44 and enters the machine vertically.
c The air is fed by stirring blades 3 that rotate at high speed together with the rotor 20.
0, the airflow becomes an outward swirling airflow that rises along the inverted conical inner surface of the lower casing 43, and the rotor 20 and stator 3
1 into the gap 32 between the two. The airflow that has entered this gap 32 becomes an upward spiral airflow due to the high speed rotation of the rotor 20. The airflow rising in the trench near the centrifugal vane 27 is further rotated by the high-speed centrifugal vane 27, and at this time an inverted conical casing 3 is placed on the outside of the centrifugal vane 27.
4, the airflow moves along the inner surface of the inverted conical casing 34 and becomes an outward swirling airflow, which will be described at the inner surface of the jet ring 37, that is, the nozzle surface 37a groove. Compressed air is injected from the six jet nozzles 35 that are open to the nozzle surface 37a, and the direction of the jet direction is toward the center and also in the swirling direction of the outward swirling airflow. The outward swirling airflow that has reached the nozzle surface 37aK described above then passes through the jet crushing zone 40 and is exhausted outside the machine from the product discharge port 38, but when passing through the jet crushing chamber 40, the compressed air from the jet nozzle 35 Because it merges with the high-speed jet of air, it becomes an inward swirling airflow.

Next, a description will be given of the pulverizing action when the material to be pulverized is supplied into the air flow inside such a superfine pulverizer. The granular material, which is the material to be crushed, supplied from the material supply port 44 rises along the inverted conical inner surface of the lower casing 43 on the outward swirling airflow generated by the high-speed rotation of the stirring blades 30. It enters the gap 32 between the rotor 20 and the stator 31. The object to be crushed that has entered this gap 32 is given velocity energy by the rotational force of the rotor 200 rotating at high speed, collides with the stator 31, is crushed, and is crushed between the protrusions 25 of the rotor 20 and the stator 31. It is subjected to a grinding action between the convex portion 33 and is further pulverized into fine pieces, and is carried upward by the rotor 20 and the upward whirling air current generated by the high-speed rotation.

Then, the fine powder coming out of the gap 2 rides on the outward swirling airflow along the inner surface of the inverted conical casing 34 due to the high speed [g] rotation of the centrifugal blade 27, and reaches the inner surface of the jet ring 37, that is, the nozzle surface 37a. During the rotation along the nozzle surface 37a, the compressed air jets from the six jet nozzles 35 apply strong blows and friction to pulverize the product, and this pulverized product becomes the jet nozzle. Jet crushing chamber 4 rides on the inward swirling airflow generated by the injection of 35 or Rano compressed air.
The product is transported to the center of the product discharge port 38 along with the air flow, and is air-transported through a discharge pipe (not shown) to the pack filter 〒, where it is separated into air and pulverized product, and the air is passed through an exhaust fan. The pulverized product is then exhausted from the exhaust pipe and stored in a hopper.

In this way, the ultrafine pulverizer of the present invention pulverizes the material to be pulverized within the annular gap 32 between the rotor 20 and the stator 31, and then crushes the inverted conical casing 3 by high-speed rotation of the centrifugal blades 27.
The jet pulverization has the following features:・1) Since the fine powder that is the material to be crushed that is supplied to the jet mill 36 is subjected to the crushing action in the annular gap 32 and has fine particles, the crushing capacity of the jet mill 36 is high, and therefore the same The amount of air blowing is small compared to the amount of raw material supplied (4), and the compressor can have a small capacity.

2) Since the fine powder is uniformly supplied to the entire nozzle surface 378 on the outward swirling airflow along the inverted conical casing 34, the crushing load of the six jet nozzles 35 is equalized.

3) Since the position where the fine powder is supplied is near the outlet of the high-speed jet nozzle 35, the effect of jet pulverization is the highest. □4) Since the supplied fine powder rotates along the nozzle surface 37a with the swirling airflow, all the supplied fine powder is subjected to the action of jet pulverization within a short time.

As can be seen from the above description, according to the ultrafine pulverizer of the present invention, the material to be pulverized is pulverized in the annular gap between the rotor and the stator, which rotate at high speed, and the fine powder is then transferred to the outward swirling air stream. Since the fine powder can be transported to the nozzle surface of the upper jet mill and jet-pulverized under optimal conditions, ultrafine powder of several microns in size can be obtained efficiently and easily.

The ultrafine grinder of the present invention still has 1. Compared to conventional fine pulverization processing equipment in which a vertical pulverizer and a jet mill are installed separately and connected by pneumatic transportation equipment or the like, maintenance, inspection and maintenance are easier, and equipment costs are lower. Furthermore, the ultra-fine pulverizer of the present invention has a jet mill with a smaller compressor capacity than the compressor capacity of the jet mill in conventional pulverization processing equipment, and the pneumatic conveying equipment may not be able to take out the product. Since only a discharge pipe, a bag filter, an exhaust fan, and a catcher are required, operating costs such as electricity costs can be significantly reduced compared to conventional pulverization equipment.

1. Brief explanation of the drawings □Figure 1 is a schematic diagram showing a conventional pulverization equipment consisting of a vertical pulverizer and a jet mill installed separately and connected by pneumatic conveyance equipment, etc. Figure 2 is a schematic diagram showing a conventional pulverization equipment according to the present invention. Vertical cross-sectional view showing an example of an ultrafine pulverizer, □1
3 is a cross-sectional view taken along line A--A of FIG. 2, FIG. 4 is a cross-sectional view taken along line B-BAI of FIG. 2, and FIG. ' □・20...
Cylindrical rotor 24... Vertical rotation axis 25...
Convex portion 26... Upper end plate 27... Centrifugal blade' 2
8...Crushing 1 take 2゛9...Lower end plate 3o.
... Stirring amblyopia 31 ... Stator 32' ... Between @
33...Convex portion 34...Inverted conical casing 3
5...Jet nozzle 36...Jet mill 37...Jet ring 38...Product discharge convex 3
9...Casing upper lid 4o...□-Crushing chamber of jet mill 43...Lower casing □44...Crushed material supply port that also serves as air intake port Attorney Patent attorney
Taka Yujibe Figure 2 3rd Figure 3 111 Figure 4 Figure 5

Claims (1)

[Claims] A cylindrical rotor supported by a vertical rotating shaft and having a large number of protrusions along the generatrix of the outer surface; In a vertical crusher that crushes a material to be crushed between a stator and a stator having a convex portion, a centrifugal blade is provided on the outer periphery of the upper end plate of the rotor, and a crushing chamber disk is provided at the upper end of the rotor. An inverted conical casing is provided at the upper end of the stator corresponding to the blades, higher than the grinding chamber disk, and a plurality of annular jets are provided at the upper end of the inverted conical casing with jet nozzles oriented tangentially toward the center at equal intervals. a mill is provided, a casing top lid having a product discharge port in the center is provided above the jet mill to form a grinding chamber of the jet mill between the grinding chamber disk, and stirring blades are provided on the lower end plate of the rotor; An ultrafine pulverizer characterized by four features: a lower casing connected to the lower end of the stator is provided with a material supply port that also serves as an air introduction port.