JPH11290784A - Classifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge no particulate matter from a coarse particle matter discharge port in a classifier mounted on a pulverizer, a dryer, and the like. SOLUTION: In a classifier wherein inside a casing 2, a classifying rotor 12 having agitating blades 13 is housed so that it can be rotated with a gap being left between the tip of the agitating blades 13 and the inner peripheral surface of the casing 2, and granular matter conveyed to the classifying rotor, laden on an air current is agitated by the agitating blades 13, and coarse particle matter is turned along the inner peripheral surface of the casing 2 to discharge it from a coarse particle matter discharge port 16 provided on the peripheral wall of the casing 2 to the outside, an air blow-out port 17 arranged in a position adjacent to the upstream side in the turning direction of the coarse particle matter to the coarse matter discharge port 16 and for jetting compressed air toward the inside of the casing 2 so as to make an acute angle to the turning direction of the coarse particle matter and also to have a component in the diameter direction of the classifying rotor 12 and an air supply means 21 for supplying compressed air to the air blow-out port 17 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a classifier mounted on a pulverizing device or a drying device incorporated in a system for producing fine particles such as food additives and toners.

[0002]

2. Description of the Related Art FIG. 12 is a block diagram of a fine particle production system incorporating a conventional pulverizer equipped with a classifier, and FIG.
FIG. 13 is a sectional view taken along line EE of FIG. 12. In the system shown in FIG. 12, raw materials sent from the previous process are silos 101,
This raw material is supplied to a pulverizer 103 via a feeder 102, and is pulverized into a granular material by a pulverizer below the pulverizer 103. The fine particles and coarse particles are classified by the classifier at the top of the crushing device 103, and the fine particles are collected by the bag filter 105 connected to the fine particle discharge port 104 at the top of the crushing device 103, Collected into a product. A fan 106 sucks the fine particles generated by the crusher 103 into the bag filter 105,
107 is a classifier of the crushing device 103 and a bag filter 105.
A conveyor 108 returns the coarse particles separated from the fine particles to the silo 101 and the feeder 102, and 108 is a sieving machine.

As shown in FIG. 13, a classifier of a crushing device 103 includes a classifying rotor 110 having a stirring blade 111 on an outer peripheral portion inside a cylindrical portion at an upper end of a casing 109 of the crushing device 103. 111 is accommodated so as to be rotatable with a gap between it and the inner peripheral surface of the casing 109, and the classifying rotor 110 is mounted on the rising airflow.
The granular material conveyed to the casing 10 is stirred by the stirring blade 111, and the coarse granular material having a large inertia force in the granular material is
9 is configured to be swung in the direction of arrow F along the inner peripheral surface of the stirring blade 11.
1 and 111 flows into the inside of the classification rotor 110, flows into the fine particle discharge port 104 above the pulverizer 103 through a through hole provided in the top wall (not shown) of the classification rotor 110, Collected by the filter 105.

Meanwhile, the bag filter 105 needs to periodically remove powder and particulate matter adhering to the filter surface, and the cleaning of the filter surface is performed by removing compressed air from a compressor (not shown) connected to the bag filter 105. Filter 10
5 by instantaneous and intermittent injection. In this case, since the pressure in the bag filter 105 fluctuates somewhat instantaneously due to the injection of the compressed air, the inflow of air from the classifier of the crushing device 103 communicating therewith is somewhat suppressed, and the classification rotor If the coarse particles are excessively retained around 110, the coarse particles may flow back to the pulverizer, causing the pulverizer to overload and fail. This problem may also occur in the case of a drying device having a built-in material crusher instead of the above crusher. Therefore, in a classifier mounted on such a crushing device or a drying device, as shown in FIG.
A coarse particle discharge port 112 is provided on the peripheral wall of the casing 09 to discharge the coarse particles rotating along the inner peripheral surface of the casing 109 to the outside from the coarse particle discharge port 112.

[0005]

In the classifier having the above-described structure, it is inevitable that a small amount of fine particles are mixed with the coarse particles rotating along the inner peripheral surface of the casing 109. There is a problem that the coarse particles are discharged from the coarse particle discharge port 112 together with the coarse particles.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent a fine particle from being discharged together with a coarse particle in a classifier mounted on a pulverizer or a dryer. It is to make.

[0007]

In order to achieve the above-mentioned object, according to the present invention, a classifying rotor having a stirring blade on an outer peripheral portion is provided inside a cylindrical casing. The powder is stored so as to be rotatable with a gap between it and the inner peripheral surface of the casing, and the powder and particles conveyed to the classifying rotor by an air flow are stirred by the stirring blade, and the powder is stirred. A classifier configured to swirl coarse particles in the granules along an inner peripheral surface of the casing to discharge the coarse particles to an outside through a coarse particle discharge port provided on a peripheral wall of the casing; The compressed air is arranged at a position adjacent to the turning direction of the coarse particles with respect to the turning direction of the coarse particles, and forms an acute angle with respect to the turning direction of the coarse particles toward the inside of the casing. To have a component force of An air outlet for, is characterized in that provided an air supply means for supplying compressed air to the air outlet.

Further, the invention of claim 2 is characterized in that, in the classifier of claim 1, an adjusting means for adjusting an opening area of the coarse particle discharge port is provided.

According to a third aspect of the present invention, in the classifier according to the second aspect, the adjusting means is disposed at a position adjacent to the coarse particle discharge port on the downstream side in the turning direction of the coarse particle,
The flap is formed to have a circular arc cross section so as to form a part of the peripheral wall of the casing, and is rotatably supported by a support shaft extending in a direction perpendicular to the turning direction of the coarse particles. It is a feature.

According to a fourth aspect of the present invention, in the classifier of the second or third aspect, the adjusting means is capable of closing the coarse particle discharge port.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a crusher 1 equipped with a classifier according to a first embodiment of the present invention,
2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a vertical cross-sectional view of the lower part of the crushing apparatus 1, FIG. 4 is a cross-sectional view taken along the line BB of FIG. 3, and FIG. FIG.

The pulverizing apparatus 1 shown in FIG. 1 is used by being incorporated in a fine particle production system as shown in FIG. 12, for example. And a classifier at the top for classifying the raw material pulverized by the pulverizer into fine particles and coarse particles.
The pulverizing device 1 has a cylindrical casing 2, a raw material input port 3 is provided at a lower portion of the casing 2, and a fine particle discharge port 4 is provided at an upper portion. A bag filter 5 is communicatively connected to the fine particle discharge port 4, and a fan 6 that sucks the fine particles generated by the crusher 1 into the bag filter 5 is communicatively connected to the bag filter 5.

As shown in FIG. 3, the pulverizer at the lower part of the pulverizer 1 has a number of pulverizing blades 9 on the outer peripheral portion thereof through a rotating shaft 7 perpendicular to the paper inside a lower end of the casing 2. The cylindrical rotor 8 is rotatably accommodated. As shown in FIG. 4, the crushing blade 9 has a T-shaped cross section, and its lower end is rotatably supported by a support shaft 10 extending parallel to a rotation shaft 7 provided along the periphery of the rotor 8. When the rotor 8 rotates, the rotor 8 stands up by centrifugal force. When a motor (not shown) connected to the rotating shaft 7 is driven, the rotor 8 rotates in the counterclockwise direction in FIG. 13 with the tip of the crushing blade 11 standing up and the inner surface of the casing 2 having a gap. Then, the raw material input from the raw material input port 3 is pinched between the tip of the crushing blade 9 and the inner surface of the casing 2 to be crushed into a granular material.

As shown in FIG. 5, the classifier at the top of the pulverizer 1 has an inverted conical outer peripheral portion inside a cylindrical upper end portion of the casing 2 via a rotating shaft 11 extending vertically. A classifying rotor 12 having a stirring blade 13 is rotatably accommodated therein. As shown in FIG. 2, each stirring blade 13
The upper and lower ends are supported by the top wall 14 and the bottom wall 15 of the classifying rotor 12 such that the distal end is located behind the base end in the rotational direction. As shown in FIG. 2, a slit-shaped coarse particle discharge port 16 extending in the vertical direction is provided on a peripheral wall of the casing 2, and a discharge communicating with the coarse particle discharge port 16 is provided on an outer peripheral surface of the casing 2. A tube 2a is attached.

A motor (not shown) connected to the rotating shaft 11
When the classifying rotor 12 is driven, the classifying rotor 12 rotates clockwise in FIG. 2 with the tip of the stirring blade 13 having a gap between the stirring blade 13 and the inner peripheral surface of the casing 2, and ascending generated inside the casing 2. The particles conveyed to the classification rotor 12 by the airflow are stirred by the stirring blades 13, and the coarse particles having a large inertia force in the particles are swirled along the inner peripheral surface of the casing 2. The coarse particles flow into the coarse particle discharge port 16 and are discharged to the outside via the discharge pipe 2a. Fine particles having a small inertia force flow into the classification rotor 12 from the gap between the stirring blades 13, 13, and the top wall 14 of the classification rotor 12.
The fine particles flow into the fine particle discharge port 4 through the through holes 14 a provided in the airbag, and are collected by the bag filter 5.

In the present invention, the air outlet 17 is provided at a position adjacent to the coarse particle discharge port 16 on the upstream side in the turning direction of the coarse particles. In the present embodiment, the air outlet 17 includes a vertically extending recess 18 formed in the inner peripheral surface of the casing 2, and a plurality of vertically extending injection angle adjusting blades 19 housed inside the recess 18. 19, ...
And a compressed air supply pipe 20 which communicates with the inside of the recess 18 and protrudes outward from the outer surface of the casing 2. A compressor (air supply means) 21 is connected to the compressed air supply pipe 20. ing.

The injection angle adjusting blades 19, 19,... Are arranged in parallel with each other at equal intervals along the opening end of the concave portion 18. When compressed air is supplied to the concave portion 18 by the compressor 21, the injection angle Compressed air is injected toward the inside of the casing 2 from a slit-shaped gap formed between the control blades 19, 19. The angle of the injection angle adjusting blades 19 is set such that the compressed air is injected in a direction D which forms an acute angle with respect to the turning direction C of the coarse particles and has a radial component force of the classifying rotor. I have.
Note that the angle of the spray angle adjusting blade 19 can be adjusted.

The fine particles contained in the coarse particles swirling along the inner peripheral surface of the casing 2 are turned inward by the compressed air flow injected from the air outlet 17, and the coarse particles are Since it does not flow into the discharge port 16, only the coarse particles are discharged from the coarse particle discharge port 16. The lower limit of the diameter of the coarse particles discharged from the coarse particle discharge port 16 varies the pressure and amount of the compressed air supplied to the air outlet 17 by the compressor 21, the angle of the injection angle adjusting blade 19, and the like. Can be adjusted.

As described above, according to the present invention, since the fine particles are not discharged from the coarse particle discharge port 16, the classification efficiency of the classifier is improved. Further, since the coarse particles discharged from the coarse particle discharge port 16 contain almost no fine particles, it is preferable that the coarse particles can be reused.

Next, a second embodiment of the present invention will be described. As shown in FIG. 6, in the present embodiment, the coarse-grained material is disposed at a position adjacent to the coarse-grained material discharge port 16 on the downstream side in the turning direction C of the coarse-grained material, and forms a part of the peripheral wall of the casing 2. A flap 22 having an arc-shaped cross section and rotatably supported by a support shaft 23 extending in a direction perpendicular to the turning direction C of the coarse particles is provided. The size of the opening area of the outlet 16 can be adjusted.

When the flap 22 is rotated in the counterclockwise direction, the opening area of the coarse particle discharge port 16 increases as shown in FIG. 7, and the amount of coarse particle discharge per unit time increases. Further, since the tip of the flap 22 is located on the inner side as compared with the state shown in FIG. 6, the powdery material turning further inside (ie, having a smaller diameter) is discharged.
On the other hand, when the flap 22 rotates clockwise from the state of FIG. 6, the opening area of the coarse particle discharge port 16 decreases as shown in FIG. 8, and the amount of coarse particle discharge per unit time decreases. . In addition, since the distal end of the flap 22 is located on the outer side as compared with the state shown in FIG. 6, only the powdery material turning further outward (ie, having a larger diameter) is discharged. The opening area of the coarse-grained material discharge port 16 is appropriately adjusted according to the type and particle size of the granular material.

Next, a third embodiment of the present invention will be described. As shown in FIG. 9, in this embodiment, the flap 2
2 can rotate until the coarse particle discharge port 16 is closed by contacting the inner end of the discharge pipe 2a. Others are the same as the second embodiment.

That is, at the beginning of the operation of the pulverizer 1, fine particles are contained in a large amount in the space around the classification rotor 12, so that the fine particles easily flow into the coarse particle discharge port 16, This is a factor that reduces the classification efficiency. Therefore, in the present embodiment, the coarse-grained material discharge port 16 is closed at the beginning of the operation, and the coarse-grained material discharge port 16 is opened when the concentration of the granular material around the classification rotor 12 becomes high. I have to.
The coarse particle discharge port 16 may be forcibly opened after a lapse of a predetermined time from the start of operation, or the concentration of the granular material around the classification rotor 12 may be checked by a sensor. The sensor may be opened when the output of the sensor becomes a predetermined value or more.

Next, a fourth embodiment of the present invention will be described. As shown in FIG. 10, in this embodiment, the tip of the flap 22 protrudes beyond the edge of the recess 18 of the air outlet 17 to a position facing the recess 18,
2 rotates clockwise, as shown in FIG.
The leading end of the flap 22 abuts on the edge of the concave portion 18 of the air outlet 17 so that the coarse particle discharge port 16 is closed.

The raw materials suitable for the present invention include, for example, okara produced during the production of tofu. Okara has a very high nutritional value and is extremely useful when used as a food additive.However, it contains germs that are difficult to grind, which deteriorates the taste. At present, it is used only for such purposes. When the okara is treated with the classifier of the present invention, the germ can be removed as coarse particles, so that the okara can be used as a tasteful and highly functional food additive. Embryos isolated from okara have extremely high purity and can be used as a material for health foods. Other raw materials suitable for the present invention include, for example, fish meal and konjac.

Note that the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention.

[0027]

As described above, the classifier of the present invention is disposed at a position adjacent to the coarse particle discharge port on the upstream side in the swirling direction of the coarse particles, and is provided with compressed air toward the inside of the casing. An air outlet for injecting so as to form an acute angle with respect to the turning direction of the coarse particles and having a radial component of the classifying rotor, and compressed air supply means for supplying compressed air to the air outlet. Since the fine particles contained in the coarse particles swirling along the inner peripheral surface of the casing are deflected inward and do not flow into the coarse particle discharge port,
Fine particles are not discharged from the coarse particle discharge port.

In the classifiers according to the second and third aspects, the opening area of the coarse particle discharge port can be adjusted to a size suitable for the type and particle size of the granular material, so that the classification efficiency is improved.

In the classifier according to the fourth aspect, the coarse particle discharge port is closed at the beginning of the operation when the fine particles are much contained in the granular material, and the fine particles are not discharged from the coarse particle discharge port. As a result, the classification efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a front view of a pulverizer 1 equipped with a classifier according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical sectional view of a lower portion of the crushing device 1.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a vertical cross-sectional view of the upper part of the crushing device 1.

FIG. 6 is a cross-sectional view of a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of a second embodiment of the present invention.

FIG. 8 is a cross-sectional view of the second embodiment of the present invention.

FIG. 9 is a cross-sectional view of a third embodiment of the present invention.

FIG. 10 is a cross-sectional view of a fourth embodiment of the present invention.

FIG. 11 is a cross-sectional view of a fourth embodiment of the present invention.

FIG. 12 is a configuration diagram of a fine particle production system incorporating a conventional crusher equipped with a classifier.

FIG. 13 is a sectional view taken along line EE of FIG. 12;

[Explanation of symbols]

 2 Casing 12 Classifier rotor 13 Stirrer blade 16 Coarse particle discharge port 17 Air outlet 21 Air supply means

Claims (4)

[Claims] 1. A classifying rotor having a stirring blade on an outer peripheral portion inside a cylindrical casing so that a tip of the stirring blade can rotate with a gap between the stirring rotor and an inner peripheral surface of the casing. And the particles conveyed to the classifying rotor on the air flow are stirred by the stirring blades, and the coarse particles in the particles are swirled along the inner peripheral surface of the casing. In a classifier configured to be discharged to the outside from a coarse particle discharge port provided on the peripheral wall of the casing, the classifier is disposed at a position adjacent to the coarse particle discharge port on the upstream side in the turning direction of the coarse particle, An air outlet for injecting compressed air toward the interior of the casing so as to form an acute angle with respect to the turning direction of the coarse particles and to have a radial component of the classifying rotor; and To supply compressed air to A classifier comprising a supply unit. 2. The classifier according to claim 1, further comprising adjusting means for adjusting an opening area of the coarse particle discharge port. 3. The adjusting means is disposed at a position adjacent to the coarse-grained material discharge port on the downstream side in the turning direction of the coarse-grained material, and has an arc-shaped cross-section so as to form a part of a peripheral wall of the casing. The classifier according to claim 2, characterized in that the classifier is a flap which is formed on the support member and is rotatably supported by a support shaft extending in a direction orthogonal to the turning direction of the coarse particles. 4. The classifier according to claim 2, wherein the adjusting means is capable of closing the coarse particle discharge port.