JPS5973065A - Super-pulverizer - 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, all particles of a 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.

In the vertical crusher, a cylindrical rotor having a large number of convex portions along the generatrix of the outer surface is supported on a vertical rotating shaft, and a certain gap is left between the cylindrical rotor and the inner surface of the rotor. A stator is fitted with a stator having a large number of protrusions along the generatrix, 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. It is used to crush objects to be crushed.

In the process of crushing the material to be crushed, the material to be crushed is supplied from a supply port provided below the casing into the annular gap between the cylindrical rotor and the stator, and the cylindrical rotor rotates at high speed. The rotational force imparts velocity energy to the material to be crushed, which collides with the stator. It is discharged as a pulverized product.

In a vertical crusher that uses such a crushing process, once the material to be crushed has been crushed to a certain extent, the crushed product also rotates along with the cylindrical rotor riding the upward spiral airflow in the annular gap, causing the cylindrical rotation It is not possible to obtain ultrafine powders of the order of a few microns, since the relative speed between the peripheral speed of the child and the milled product decreases, resulting in a reduced impact effect and shatter.

In addition, a jet mill passes compressed air or high-temperature steam through a nozzle installed in a grinding chamber, converts it into velocity energy, creates a trajectory of high-speed airflow, and creates a trajectory of 1 cw1.
The pulverized material is continuously and automatically supplied (~), and pulverization is performed by generating strong impact and friction, making it possible to obtain ultrafine gold powder on the order of several microns.

However, when the particle size of the powder or granular material that is the material to be crushed becomes large, the processing capacity is extremely reduced.
Power consumption of compressor drive for Pk processing Kw
"h/KP (depending on the type of material to be pulverized and the size of the mill, but generally 1 to 4 Kw"h/Ky.

Less is more.

Furthermore, the fine grinding equipment, which is completely separate from the vertical grinder and jet mill, is simply a pneumatic conveyor equipment, etc.? The fine pulverization process for this will be explained with reference to Fig. 1. The material to be pulverized is supplied to the vertical pulverizer 1 and is pulverized, and the pulverized product is passed through the discharge pipe 2 by the drive of the exhaust air 8g4. and is air transported to the bag filter 8.
Here, the air and the pulverized product are separated, the air is exhausted from the exhaust pipe 5 through the exhaust fan 4, and the pulverized product is temporarily stored in the hopper 6. The crushed products in hopper 6 are fed to feeder 7.
The air is sent to the transport pipe 8, and is transported through the transport pipe 8 to the filter 9 by driving the exhaust fan 10 provided at a separate position, where the air and the pulverized product are separated. Air is exhausted from the exhaust pipe 11 through the exhaust fan 10, and the pulverized product is temporarily stored in the hot spring ζ-]2. The pulverized product in the omper 12 is supplied to the jet mill 14 by a feeder 18, and is pulverized by jetting compressed air.

Then, by driving the exhaust fan 7, the air is transported through the transport pipe 15 to the Tebag filter 16, where the air and the finely pulverized product are separated, and the air passes through the exhaust fan 17 to the exhaust pipe 18.
The pulverized product is stored in the hopper 19.

In this type of equipment that processes the material to be pulverized in two stages, such as first pulverizing it with the vertical pulverizer 1 and then pulverizing it with the jet mill 14, the pneumatic conveying equipment becomes the key.
Not only are the equipment costs and operating costs enormous, but
A great deal of effort and time is spent on maintenance, inspections, maintenance, etc.

The present invention has been developed in view of the above-mentioned circumstances, and has low equipment and operating costs, easy maintenance, inspection, maintenance, etc., and is capable of efficiently and easily converting all objects to be crushed into ultrafine powder on the order of microns. It is an object of the present invention to provide an ultrafine pulverizer that can perform fine pulverization.

An embodiment of the ultrafine pulverizer according to the present invention will be explained below with reference to FIGS. 2 to 5. Reference numeral 20 denotes a cylindrical rotor, and a vertical rotating shaft rotatably supported on a pedestal 28 by bearings 21 and 22. It is supported on the top of 24. This rotor 2
A large number of convex portions 25 are provided on the outer surface of 0 along its generatrix line to form an uneven surface. A stator 26 is fitted around the outer periphery of the rotor 20 with a constant gap 27, and its inner surface is provided with a number of convex portions 28 along the generatrix line to form an uneven surface. A centrifugal vane 80 is provided on the outer periphery of the upper end plate 29 of the rotor 20, and an inverted conical casing 81 is provided at the upper end of the stator 26 corresponding thereto. A disk 32 is provided at the upper end of the centrifugal blade 80, on which a large number of classification plates 88 (12 in this example) are provided radially, and a through hole 84 is provided at the center of the upper end of the classification plate 83.
A classification disc 85 having a classification disc 85 is provided, and the classification rotor 36 is constituted by this classification disc 85. This classification rotor 8
6, a jet ring 89 of a jet mill 88 is provided at the upper end of the inverted conical casing 81 with six jet nozzles 87 equally spaced tangentially toward the center. An annular compressed air distribution pipe 480 is provided on the outer peripheral side of the pipe 9 and communicates with the jet nozzle 87 . 41 is a compressed air inlet of the compressed air distribution pipe 40. A casing top cover 42 is provided on the top surface of the IJ song 9, and a through hole 8 in the center of the classification disk 85 is provided in the center of the casing top cover 42.
A product discharge port 48 whose proximal end is fitted into 4 is vertically provided,
A secondary air intake port 45 with a damper 44 is provided on the outside of the product discharge port 48 . Lower end plate 4 of the rotor zO
A stirring blade 47 is provided at the stator 26, and an inverted conical lower casing 48 is provided at the lower end of the stator 26 to cover the stirring blade 47, and a material supply port 49 serving as an air inlet is provided on the lower surface of the lower casing 48. is provided. 50 is the vertical rotation axis 24
51 is a drive belt fixed to the lower end of the pulley,
The drive belt 51 is passed between a pulley (not shown) on the rotating shaft of the electric motor and the pulley 50.

Although not shown, a discharge pipe is connected to the product discharge port 48, 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.

Next, the operation of the ultrafine pulverizer of the present invention constructed as described above will be explained. First, the exhaust fan (not shown) is fully operated to suck air from the material supply port 49 on the lower surface of the lower casing 48, and secondary air is sucked from the secondary air intake port 45 with the damper 44 open. The compressor attached to the jet mill 88 is fully driven to input compressed air from the compressed air inlet 41 into the annular compressed air distribution pipe 40, and the jet ring 89
The jet is ejected from six jet nozzles 87, and further drives an electric motor (not shown) to drive the rotor 20i by the drive belt 51.
The airflow inside the ultrafine pulverizer when rotating at high speed will be explained.

The air sucked in from the material supply port 49 and vertically entered into the machine is passed through the stirring blade 47 that rotates at high speed together with the rotor 20.
This creates an outward swirling airflow that rises along the inverted conical inner surface of the lower casing 48, causing the rotor zO and stator 26
It enters the gap 27 between. The airflow that has entered this gap 27 becomes an upward spiral airflow due to the high speed rotation of the rotor 20. The airflow that has risen to the vicinity of the centrifugal blade 80 is further rotated by the high-speed rotating centrifugal blade 80, but at this time, since there is an inverted conical casing 81i on the outside, the airflow is shaped like the inverted conical casing 81i. casing 81
The airflow becomes an outward swirl while moving upward along the inner surface of the jet ring 39, that is, the nozzle surface 89ai.
reach it. Compressed air is ejected from the six jet nozzles 87 opened in the nozzle surface 89a, and the direction of the jet direction is toward the center and in the swirling direction of the outward swirling airflow. The outward swirling airflow that has reached the nozzle surface 89a described above is
The classification rotor 86 merges with the high-speed jet of compressed air from the jet nozzle 87 and also with the secondary air taken in from the secondary air intake port 45, and rotates at high speed together with the rotor 20 - upward inward rotation. The air flows through the classification rotor 86 and is exhausted to the outside of the machine from the product discharge port 4B.

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 powder and granular material, which is the material to be crushed, is supplied from the material supply ports 4 and 9.
Riding on the outward swirling airflow generated by the high-speed rotation of the stirring blades 47, the air rises along the inverted conical inner surface of the lower casing 48 and enters the gap 27 between the rotor zO and the stator 26. The material to be crushed that has entered this gap 27 is given velocity energy by the rotational force of the rotor 20 which is rotating at high speed, and hits the stator 26 4, □1□, □. V〒=stomach 3
While being further finely pulverized by the grinding action in the 2°8 chamber, it is carried upward by the upward spiral airflow generated by the high speed rotation of the rotor 20. The fine powder coming out from the gap 27 is well dispersed without agglomeration due to the high speed rotation of the centrifugal blade 8o, and the particles are well dispersed into the inverted conical casing 8.
It is carried to the inner surface of the jet ring 89, that is, the nozzle surface 89a, by the outward swirling airflow along the inner surface of the jet ring 89. Further, the fine powder adhering to some of the coarse powder is separated by the high speed rotation of the centrifugal blade 80 while being conveyed to the inner surface of the jet ring 89. Then, while the fine powder and coarse powder rotate along the nozzle surface 89&, they are subjected to strong impact and friction by jets of compressed air from six jet nozzles 87, and are ultra-finely pulverized. The classification rotor 86 is carried by pressure on the side of the classification rotor 86 riding on the inward swirling airflow generated by the classification rotor 86 which is injected and rotates at high speed.
6, and only the fine powder passes through the classification plate 88 and is discharged from the product discharge port 4B together with the air flow. On the other hand, the small coarse particles thrown away by the classification plate 88 rotate along the nozzle surface 89a of the jet ring 89, and during that time they are again subjected to strong impact and friction due to the jet of compressed air from the six jet nozzles 87. This fine powder is carried to the classification rotor 86 side by the jet nozzle 87 of compressed air and the inward swirling airflow generated by the classification rotor 86 rotating at high speed. Then, only the fine powder passes through the classification plate 3B and is discharged from the product discharge port 4B together with the air flow, and the classified coarse powder is again pulverized into ultra-fine powder by the jet mill 88. The fine powder discharged from the product discharge port 48 along with the air flow is air-transported to a bag filter through a discharge pipe (not shown), where it is separated into air and finely pulverized product, and the air is exhausted from the exhaust pipe through an exhaust fan. The finely ground product is stored in a hopper.

In this way, the ultrafine pulverizer of the present invention pulverizes the material to be pulverized within the annular gap 27 between the rotor 20 and the stator 26, and then the inverted conical casing 8 is pulverized by the high speed rotation of the centrifugal blades 80.
The particles are conveyed to the nozzle surface 89a on the outward swirling airflow along the direction 1 and are ultra-finely pulverized by the jet mill 88. The jet pulverization has the following characteristics. That is, υ The fine powder, which is the material to be crushed, supplied to the jet mill 88 is subjected to the crushing action in the annular gap 27 and becomes fine, so the jet mill 88 has a high crushing capacity, and therefore the same raw material supply amount (
The amount of air blown out is small compared to T/H), so a compressor with a small capacity is fine.

2) Since the fine powder is uniformly supplied to the entire nozzle surface 89a on the outward swirling airflow along the inverted conical casing 31, the crushing load of the six jet nozzles 87 is equalized.

8) Since the position where the fine powder is supplied is near the outlet of the high-speed jet jet nozzle 87, the effect of jet pulverization is the highest.

4) Since the supplied fine powder rotates along the nozzle surface 89a with the swirling airflow, all the supplied fine powder is consumed by the amount of jet pulverization within a short time.

Furthermore, in the ultrafine pulverizer of the present invention, as described above, the particles are carried to the nozzle surface 89 & of the jet ring 89 on the outward swirling airflow along the inner surface of the inverted conical casing 81, so that the particles are uniformly dispersed in the circumferential direction. , the concentration is approximately uniform in the circumferential direction, and the airflow inside the jet ring 89 is similar to that of the classification rotor 86.
Due to the high-speed rotation of the jet nozzle 87 and the injection of compressed air from the jet nozzle 87, the airflow is rectified into an inward swirling airflow, and there is no turbulence in the airflow. Therefore, the classification by the classification rotor 86 becomes highly accurate, the coarse powder is not discharged outside the machine together with the fine powder, and the coarse powder is re-pulverized by the jet mill 88.

As can be seen from the above explanation, according to the ultrafine grinder of the present invention,
The entire object to be crushed is crushed in the annular gap between the rotor and stator, which rotate at high speed, and the fine powder is then carried to the nozzle surface of the jet mill at the top by an outward swirling airflow, allowing the fine powder to be jet-pulverized under optimal conditions. Therefore, ultrafine powder on the order of several microns can be easily obtained. i! The coarse powder in the fine powder that was not jet-pulverized by the jet mill is classified by the classification rotor that rotates at high speed together with the rotor, and only the fine powder is discharged outside the machine. Since it is pulverized, all of the material to be pulverized is ultra-finely pulverized, resulting in extremely high pulverization efficiency.

Furthermore, the ultrafine pulverizer of the present invention has a vertical pulverizer and a jet mill installed separately, and is connected to them by a pneumatic conveyance facility, etc., which makes maintenance, inspection, and maintenance easier than conventional pulverization processing equipment. The equipment cost is low, and the compressor capacity of the jet mill is smaller than the compressor capacity of the jet mill in conventional pulverization processing equipment.
The pneumatic conveyance equipment is a discharge pipe for taking out the product.

Since only the bag filter, exhaust fan, and hopper are required, operating costs such as electricity costs can be significantly reduced compared to conventional pulverization equipment. Furthermore, since the ultrafine pulverizer of the present invention is equipped with a classification rotor in front of the product discharge port, there is no need to separate the pulverized product with a separate classifier as in the past. It has excellent effects such as eliminating transportation equipment, eliminating equipment costs and operating costs associated with using the classifier, and making maintenance, inspection, and maintenance extremely easy since only the classifier rotor is required.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a conventional pulverizing equipment in which a vertical pulverizer and a jet mill are placed separately and connected by pneumatic conveying equipment, etc., and Fig. 2 is an example of an ultrafine pulverizer according to the present invention. FIG. 8 is a cross-sectional view taken along line A-A in FIG. 2, FIG. 4 is a cross-sectional view taken along line B-B in FIG. 2, and FIG. 5 is a cross-sectional view taken along line C-C in FIG. It is a cross-sectional view of a seed. 20...Rotor 24...Vertical rotation axis 25...
Convex portion 26... Stator 27... Gap 28... Convex portion 29... Upper end plate 30... Centrifugal blade 81...
・Inverted conical casing 34...Through hole 86...Classifying rotor 37...Jet nozzle 88...Jet mill 42...Casing top cover 48...Product outlet 45...Secondary air intake Entrance 46...lower end plate 47
... Stirring blade 48 ... Lower casing 49 ...
- Supply port for crushed material that also serves as an air intake port Applicant: Kawasaki Heavy Industries, Ltd. Representative Patent Attorney Yujibu Taka Figure 3 Figure 4

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 having a convex portion, centrifugal blades are provided on the outer periphery of the upper end plate of the rotor,
An inverted conical casing is provided at the upper end of the stator corresponding to the centrifugal blade, a classification rotor having a through hole in the center is provided at the upper end of the centrifugal blade, and a jet is provided at the upper end of the inverted conical casing tangentially toward the center. An annular jet mill with a plurality of nozzles oriented at equal intervals is provided, and a product discharge port that fits into the through hole of the classification filter is provided in the center on the upper side of the jet mill, and a secondary air intake port is provided on the outside thereof. a casing upper lid having a casing upper lid, a stirring blade provided on the lower end plate of the rotor, an inverted conical lower casing provided at the lower end of the stator, and a material supply port for crushed material that also serves as an air introduction port provided in the lower casing. Ultra fine grinder with all the features.