JP2000024530A - Mechanical grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanical grinder equipped with an adhesion preventing mechanism preventing the adhesion of a particulate material in the grinder when a raw material high in adhesiveness is ground to enable continuous operation. SOLUTION: In constitution wherein a classifying rotor 5 and a blade rotor 2 provided under the rotor 5 are provided and the particulate material generated by grinding a raw material by the blade rotor 2 is classified by the classifying rotor 5, a surface 10a of which the cross section has a predetermined shape is provided to a mill cover 10 from the side surface inner periphery thereof to the ceiling surface thereof so that the inernal circulation of the particulate material is smoothly performed in the grinder surrounded by the main body 3 housing the classifying rotor and the blade rotor 2 and the mill cover 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical pulverizer, and more particularly, to a mechanical pulverizer provided with an adhesion preventing mechanism for preventing powder particles from adhering inside the apparatus.

[0002]

2. Description of the Related Art Conventionally, mechanical pulverizers for mechanically pulverizing raw materials to produce powders have been used. FIG.
It is a longitudinal cross-sectional view schematically showing the conventional mechanical pulverizer. In the figure, the raw material is supplied to a hopper 307,
The material is supplied into the machine via a material supply pipe 301 by a screw feeder 308, and is pulverized between a blade rotor 302 rotating at high speed and a liner 303 around the blade rotor 302.

[0003] The pulverized material is led to a classification rotor 305 by an air flow supplied through an air supply pipe 304, and the fine powder selected here is discharged to the outside through a discharge pipe 306, and the remaining coarse powder is discharged. Is returned to the pulverizing section and re-pulverized. The fine powder discharged through the discharge pipe 306 is collected by a collector (not shown) such as a cyclone or a bag filter arranged later.

A substantially cylindrical guide ring 30 is provided between the blade rotor 302 and the classifying rotor 305 in the machine.
9 are provided. This prevents the raw material pulverized by the blade rotor 302 from directly jumping into the classification rotor 305 without being normally classified, and also functions to promote convection in the machine. Further, in order to completely surround the classifying rotor 305 with the guide ring 309, a bypass portion 310 is provided in the upper part of the machine, where the convective powder and granules bypass.

[0005]

However, when highly adhesive metal oxides such as titanium oxide and oil-containing materials such as pepper and soybean foods are used as raw materials for grinding, In the configuration of a mechanical pulverizer, the operation may not be possible due to the adhesion of the pulverized raw material in the apparatus. This is caused by the pulverized raw material turning inside the machine more than necessary. In particular, the adherence is severe at the guide ring 309 and the detour 310, and once adhered, the adhered matter grows rapidly, and finally, the inside of the machine is closed.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a mechanical pulverizer having an anti-adhesion mechanism capable of preventing powder particles from adhering inside a machine and enabling continuous operation even when a highly adhesive raw material is pulverized. The purpose is to provide a machine.

[0007]

In order to achieve the above object, the present invention provides a classifying rotor and a blade rotor provided below the classifying rotor. In a mechanical pulverizer for classifying the powder and granules by the classifying rotor, so that the internal circulation of the powder and granules is performed smoothly in a room accommodating the classifying rotor and the blade rotor, A configuration is provided in which a section having a predetermined shape is provided over the ceiling surface.

[0008] Further, the predetermined shape is an R-shaped shape. Alternatively, the predetermined shape has a configuration in which straight-shaped chamfering is performed.

A guide ring is provided between the classifying rotor and the blade rotor.
In order that internal circulation of the said granular material may be performed smoothly, it shall be set as the minimum height required. The guide ring has a configuration in which the upper end inner diameter is smaller than the lower end inner diameter.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view schematically showing one embodiment of the mechanical crusher of the present invention. In the figure, reference numeral 3 denotes a substantially cylindrical main body,
Is a classifying rotor provided near the center of the inside of the main body 3, 2 is a blade rotor coaxially provided below the classifying rotor 5, and 11 provided below the classifying rotor is a classifying rotor 5 and a blade rotor 2. These are motors that rotate at predetermined rotation speeds.

A cap-shaped mill cover 10 covers the opening in the upper part of the main body 3, and the respective flange portions 3b and 10c are fixed to each other in close contact with screws (not shown). Further, a surface 10a having an R-shaped cross section is provided over the entire circumference from the lower part of the inner peripheral surface of the mill cover 10 to the ceiling surface. In the center of the mill cover 10, a discharge pipe 6 for discharging the classified powders penetrates and extends upward. In addition, a raw material supply pipe 1 penetrates and extends outward at one location near the blade rotor 2 around the main body 3, and a hopper 7 is attached upward at the tip. Further, a screw feeder 8 passes through the inside of the raw material supply pipe 1. The drive unit is not shown.

A plurality of hammers 2 a for crushing the raw material are provided upward around the blade rotor 2, and a blade 5 a for classifying the powder and granules extends around the classifying rotor 5 near the ceiling surface of the mill cover 10. As described above, this is also provided in a plurality upward. A short, substantially cylindrical guide ring 9 is provided between the classifying rotor 5 and the blade rotor 2. This guide ring 9
Is supported on the upper outer peripheral surface by a rod 10 b extending inward from several places on the lower inner peripheral surface of the mill cover 10.
On the inner peripheral surface of the guide ring 9, the normal is directed inward or obliquely downward (i.e., the upper end inner diameter is smaller than the lower end inner diameter) to prevent adhesion. The guide ring 9 and the mill cover 10 form an adhesion preventing mechanism.

An air supply pipe 4 for taking in air is provided at one location on the outer peripheral surface of the lower part of the main body 3.
A ring-shaped partition plate 12 is provided between the lower part of the main body 3 into which the air is introduced and the upper part where the raw material is crushed and classified. In addition, 13 is a base which supports the whole. In the same figure, the raw material is supplied to a hopper 7 and supplied to the inside of the machine via a raw material supply pipe 1 by a screw feeder 8 in the same manner as described in the above-mentioned prior art, and the blade rotor 2 is rotating at a high speed. Hammer 2a
And a liner 3a provided on the inner peripheral surface of the main body 3 around the same.

The pulverized material is guided to a classifying rotor 5 by an air flow supplied through an air supply pipe 4, and the fine powder selected here is discharged to the outside via a discharge pipe 6, and the remaining coarse powder is discharged. Is returned to the pulverizing section and re-pulverized. The fine powder discharged through the discharge pipe 6 is collected by a collector (not shown) such as a cyclone or a bag filter arranged later.

A short, substantially cylindrical guide ring 9 provided between the blade rotor 2 and the classifying rotor 5 in the machine is provided with a raw material pulverized by the blade rotor 2.
This prevents the air from directly jumping into the classification rotor 5 without being classified normally, and promotes convection in the machine. However, depending on the conditions of the raw material and the like, the guide ring 9 may be unnecessary.

Also, the height of the guide ring 9 is set so that the pulverized raw material does not rotate unnecessarily in the upper part of the machine.
(Represented by the dimension line) is minimized, the dead zone is eliminated by the above-mentioned R-shaped surface 10a provided on the mill cover 10, and the lower end of the mill cover 10 is brought as close as possible to the hammer 2a of the blade rotor 2. . As a result, the internal circulation of the pulverized raw material is performed smoothly, and the classification of fine powder by the classification rotor 5 is also performed smoothly.

In this embodiment, the mill cover 10 is used.
A surface 10a having an R-shaped cross section is provided over the entire circumference from the lower part of the inner peripheral surface to the ceiling surface, but this is not necessarily required to be provided from the lower part of the inner peripheral surface of the mill cover 10; As shown in a), the radius of the R-plane shape of 10a may be reduced so as to be provided from the upper part of the inner peripheral surface of the mill cover 10 to the ceiling surface, or as shown in FIG. It is good also as a shape changed to. Further, as shown in FIG. 3C, a straight chamfer may be applied. These shapes can be selected as needed.

The conditions and results of the adhesion test of the mechanical pulverizer according to the present embodiment will be described below. Here, the outer diameter of the fitting portion of the mill cover 10 with the inner periphery of the main body 3 is about 340 mm,
The surface 10a has a radius of 80 mm from the lower portion of the inner peripheral surface of the mill cover 10 to the ceiling surface. The inner diameter of the upper end of the guide ring 9 is 240 mm, the outer diameter of the lower end is 250 mm, and the thickness is 5 mm.
mm and height l = 40 mm.

The operating conditions were as follows: raw material: light calcium carbonate Rotation speed of blade rotor 2: 6800 rpm. Number of rotations of the classifying rotor 5: 5300 rpm. Feed amount of raw material: about 100 kg Processing time: about 1 hour

As a result of performing an adhesion test under these conditions, adhesion of a thickness of about 2 mm was observed on the outer peripheral surface of the guide ring 9, but no adhesion was observed at other locations.
By the way, when the adhesion test is carried out by the above-mentioned conventional mechanical pulverizer under the same operating conditions, remarkable in-machine adhesion is observed, and it can be said that the adhesion preventing effect in the present embodiment is high.

As another embodiment, as shown in FIG. 4, an air duct 14 extending outside the main body 3 is additionally provided in place of the raw material supply pipe 1 and the screw feeder 8 shown in FIG. This is provided with a hopper 7 at a position on the way through a rotary valve 15 and an air adjusting valve 16 at a position beyond the hopper 7. The raw material supplied from the hopper 7 and the air supply duct 14 are supplied from the tip. The raw material is supplied to the inside of the machine by the air flow duct 14 by the air flow while the ratio of the air to the air is adjusted by the rotary valve 15 and the air adjusting valve 16 respectively. Incidentally, an air filter 17 is provided at the tip of the air transport duct 14.

According to such a structure, it is more effective when pulverizing a raw material having a strong adhesion. This is because the above-mentioned screw feeder has an effect of compressing and compacting the raw material powder to a considerable extent, so that the reduction in the grinding performance due to the deterioration of the dispersibility during the subsequent grinding and classification and the influence on the adhesion inside the machine are ignored. This is because such a problem does not occur if an air duct is used.

The room accommodating the classifying rotor and the blade rotor referred to in claim 1 corresponds to the inside of the machine surrounded by the main body 3 and the mill cover 10 in the embodiment.

[0024]

As described above, according to the present invention,
It is possible to provide a mechanical pulverizer provided with an adhesion preventing mechanism that prevents powder and granules from adhering to the inside of the apparatus and enables continuous operation even in the case of pulverizing a highly adherent raw material.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing one embodiment of a mechanical crusher of the present invention.

FIG. 2 is a view showing a variation of a sectional shape of a mill cover.

FIG. 3 is a longitudinal sectional view schematically showing a conventional mechanical pulverizer.

FIG. 4 is a longitudinal sectional view schematically showing another embodiment of the mechanical crusher of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw material supply pipe 2 Blade rotor 2a Hammer 3 Main body 3a Liner 3b Flange part 4 Air supply pipe 5 Classification rotor 5a Blade 6 Discharge pipe 7 Hopper 8 Screw feeder 9 Guide ring 10 Mill cover 10a Surface 10b Rod 10c Flange part 11 Motor 12 Partition plate 13 Base 14 Air Duct 15 Rotary Valve 16 Air Adjustment Valve 17 Air Filter

Claims (5)

[Claims] 1. A mechanical pulverizer, comprising: a classifying rotor; and a blade rotor provided below the classifying rotor, and classifying, by the classifying rotor, a powder or granules produced by pulverizing a raw material by the blade rotor. In order to facilitate the internal circulation of the powder and granules in the room accommodating the classifying rotor and the blade rotor, a surface having a predetermined cross section is provided from the inner periphery of the side surface of the room to the ceiling surface. A mechanical pulverizer characterized by the following. 2. The mechanical crusher according to claim 1, wherein the predetermined shape is an R-shaped shape. 3. The mechanical crusher according to claim 1, wherein the predetermined shape is a shape obtained by chamfering a straight shape. 4. A guide ring is provided between the classifying rotor and the blade rotor, and the guide ring has a minimum necessary height so that the internal circulation of the granular material is smoothly performed. The mechanical pulverizer according to any one of claims 1 to 3, characterized in that: 5. The mechanical crusher according to claim 4, wherein the guide ring has an upper end inner diameter smaller than a lower end inner diameter.