JPH11179222A - Pulverizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulverizer in which hardly pulverizable material can be subjected to pulverization at an ordinary temperature to effectively obtain uniform powder of superfine particles and there is no possibility of coarse particles being mixed in the product. SOLUTION: A pulverizer 1 has a fixed grindstone 2 and a rotary grindstone 3 installed in a casing 4 and a rotating blade 8 arranged on the back surface of a rotating disc 6. Fresh air sucked in from a hopper 10 is sent to between both the grindstones and is turned into a spin type rotating high speed air current A, which flows to be outward uniformly dispersed, and the air current that has gone to the outside is turned into a turning current while it is hit against the inner peripheral surface of a pulverizing chamber 4b. On the inner peripheral surface of the pulverizing chamber 4b, a corrugated lining plate 12 is attachably and detachably fitted so that material to be pulverized carried on the turning current and hit against it is pulverized. A collecting annular body 4d for distributing in layers the pulverized material according to the particle diameter is provided for the casing 4, to the upper end and the back surface of the annular body 4d, a secondary fine powder recovery tubular body 13 and a coarse particle reflux tubular body 14 communicating with a feeding pipe 9 are connected respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulverizing apparatus for pulverizing an object to be pulverized between whetstones and pulverizing the object while rotating it by an exhaust airflow.

[0002]

2. Description of the Related Art A pulverizer adopting the milling principle has two upper and lower whetstones whose distance can be adjusted. A strong centrifugal force is applied between an upper whetstone to be fixed and a lower whetstone rotating at high speed. An impact grinding force and a shear force are generated, and the object to be ground is finely pulverized by their combined action.

In such a crusher, high fat, high moisture,
A pulverizer that can be applied to hard-to-pulverize substances containing a large amount of high proteins, carbohydrates and special enzymes is, for example, a pulverizer described in JP-A-7-185372.
This device generates a strong depressurized jet stream between the surfaces of the grinding wheels due to the action of the rotating blades attached to the rotating wheel, generating heat in the grinding process of difficult-to-grind materials, stickiness due to oozing of lipids, stickiness due to moisture. The raw material to be supplied is finely pulverized at room temperature without increasing the temperature while suppressing sticking, burning due to oxidative deterioration and the like, film formation and the like.

[0004] A conventional pulverizing apparatus for grinding an object to be pulverized between whetstones while generating a depressurized jet stream as described above,
As shown in FIG. 3, a pair of upper and lower fixed grindstones 102, a rotating grindstone 103, and a rotating blade 108 attached to a rotating disk 106 on which the rotating grindstone 103 is mounted to generate a discharge airflow toward the outside of the grindstone between opposing surfaces of the two grindstones. , Casing 1 with both whetstones inside
04, and a recovery pipe 111 that communicates with the casing 104 and sends out the pulverized material.

[0005] The raw material 115 to be pulverized introduced from the opening 102a of the fixed grindstone 102 through the charging pipe 109 is ground between the opposed flat grinding surfaces 102b and 103b of the two grindstones. A jet airflow is generated in between, and the outside air is sucked from the opening 102a of the fixed whetstone 102, and a spin-shaped high-speed airflow is generated between the whetstone surfaces in the direction of motor rotation, and flat while entraining the supplied raw material 115 to be ground. The fine powder 116 was forcibly passed between the grinding surfaces at a high speed, and the fine powder 116 was sent from the casing 104 to the collection pipe 111 by using the airflow.

[0006]

However, the conventional pulverizing apparatus 101 has a configuration in which all the pulverized material discharged to the outside of the grindstone is carried out to the collection pipe 111, so that the coarse pulverized product is not sufficiently pulverized in the product. There was also a risk of particles being mixed. or,
Since the crushing action was almost the crushing action between the flat crushing surfaces on the outer periphery of the grindstone, it was difficult to efficiently obtain ultrafine powder, and it was also difficult to obtain a uniform particle size.

[0007] The present invention solves the above-mentioned problems, and it is possible to pulverize at room temperature even with difficult-to-pulverize substances, to efficiently obtain ultrafine powder having a uniform particle size, and to obtain a powder in a product. It is an object of the present invention to provide a pulverizer that does not have a possibility of mixing coarse particles.

[0008]

In order to solve the above-mentioned problems, a casing of a pulverizing apparatus according to the present invention comprises a corrugated lining plate detachably mounted on a surface on which a pulverized material swirling in an exhaust air flow collides, A collection annular body that distributes the material layered according to the particle size, and as a collection tube,
A fine powder collection tube communicating with the upper end of the collection ring, a coarse particle reflux tube communicating with the lower end of the collection ring and connected to the charging tube, and a fine particle collection tube and a coarse particle reflux tube Characterized in that the flow rate adjusting mechanism is provided.

A plurality of rotating blades are provided at equal intervals in a circumferential direction on a rotating disk on which a rotating grindstone is mounted so that outside air is sucked from an opening of a fixed grindstone and discharged between the opposed surfaces of the two grindstones toward the outside of the grindstone. Create an airflow. The raw material to be pulverized from the charging pipe is
It is sent between the two grinding wheels from the opening provided in the center of the fixed grinding wheel, and while being entrained in the spinning high-speed airflow in the motor rotation direction, it is forcibly high-speed passed between the opposing outer grinding surfaces of the two grinding wheels and ground. You.

The pulverized material sent out of the grindstone collides with the corrugated lining plate on the swirling airflow generated in the casing and is further finely pulverized. Since the corrugated lining plate has a detachable structure, it is possible to select a corrugated lining plate having a concave-convex shape and material that is optimal for the raw material.

The pulverized material turning while continuously colliding with the corrugated lining plate is finely pulverized and, at the same time, has a layered distribution according to the particle size in the collecting annular body. That is, the fine powder is classified into an upper layer, and the coarse particles are classified into a lower layer, and are separately conveyed to a fine powder recovery pipe and a coarse particle reflux pipe. Each pipe body is provided with a flow rate adjusting mechanism by a valve body, and an appropriate layered distribution is realized by appropriately managing the amount of pulverized material flowing into each pipe body.

In the coarse particle reflux tube, a pulverized material that has not been sufficiently pulverized is sent from the charging tube to between the two grindstones, and is subjected to grinding and collision grinding again. Thereby, the pulverized material pulverized to a desired particle size is sent from the collection ring to the fine powder collection tube.

Here, it is desirable that the fixed grindstone and the rotary grindstone have a radial deep feed groove for feeding the raw material to be crushed on a surface other than the flat grinding surface. This is to make the feeding action extremely large, and the depth and arrangement of the feed grooves are appropriately adjusted depending on the grain size of the grinding wheel on the flat grinding surface.

Further, the rotary grindstone is provided with a coarse cutting cutter fixed to the rotary shaft, and a casing is provided at the opening in the casing for collecting fine powder generated by the coarse cutting cutter. It is desirable to do. The crushing and cutting cutter cuts the raw material to be crushed into an appropriate size and sends it between the two whetstones. However, depending on the crushed material, fine powder may be generated simultaneously with the cutting. If the material to be ground is a particle or a substance having a low specific gravity, the fine powder may soar at the same time as the powder is charged. Fine powder rising from these openings is collected by a cylinder provided around the charging pipe.

[0015]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of the crusher, and FIG. 2 is a sectional view showing a II-II section of FIG. The crushing device 1 includes a pair of upper and lower fixed whetstones 2 and a rotary whetstone 3 provided inside a casing 4. The rotary grindstone 3 is detachably mounted on a shaft 5 extending from an electric motor (not shown) via a rotary disk 6, and a coarse crushing cutter 7 is provided at a tip of the shaft 5 protruding from a center portion 3 a thereof. On the lower surface of the rotating disk 6, the rotating blades 8 are arranged at predetermined intervals in the circumferential direction.

The fixed whetstone 2 has an opening 2a in the center,
Similarly, it is detachably attached to the casing lid 4a having an opening. A charging pipe 9 for supplying a raw material to be pulverized is provided above the opening, and a hopper 10 is attached to an upper end thereof. A primary fine powder collection cylinder 11 is provided on the outer periphery of the charging pipe 9.
Is established.

When the rotary wings 8 are driven, the outside air sucked from the hopper 10 is sent between the two grindstones and becomes a spinning high-speed airflow A in the motor rotation direction, which is uniformly dispersed in the outside direction. The airflow that has flowed out of the grindstone becomes a swirling airflow B while colliding with the inner peripheral surface of the casing 4. The casing 4 has an anti-decompression function, and a wave-shaped lining plate 12 is detachably attached to the inner peripheral surface of the pulverizing chamber 4b on the outer side of both whetstones. As the corrugated lining plate 12, a material having the optimum uneven shape and material is selected so that the material to be pulverized colliding with the swirling airflow B is pulverized.

Above the grinding chamber 4b, a donut-shaped cylindrical body 4 is provided.
The collection circular body 4d is set up and the collection chamber 4b is arranged together with the pulverizing chamber 4b to distribute the pulverized material in layers according to the particle size. A secondary fine powder recovery pipe 13 is connected to the upper end of the collection ring 4d, and a coarse particle reflux pipe 14 is connected to the lower face. The coarse particle reflux pipe 14 communicates with the charging pipe 9.

The opening 2a of the fixed grindstone 2 through the input pipe 9
The raw material 15 to be pulverized is cut into an appropriate size by the coarse cutting cutter 7. The primary fine powder 16 rising simultaneously with the cutting is sent from the primary fine powder collection cylinder 11 to a collection case (not shown). The other raw material 15 to be crushed is sent between the two grindstones, and is entangled in the spinning high-speed air flow A while being provided on the outer peripheral portions of the opposed grindstones 2.
b and 3b are forcibly passed at a high speed and ground.

These two grindstones have a radial deep feed groove 2c, which feeds the raw material to be ground to the surfaces other than the flat grinding surfaces 2b, 3b.
3c is provided. This greatly enhances the feeding action, and the depth and arrangement of the feed grooves are determined by the flat grinding surface 2.
Adjust appropriately according to the grain size of b and 3b. The width of the flat grinding surfaces 2b and 3b is desirably 25 mm or less, and the mutual interval between the flat grinding surfaces is adjusted to about 100 μ to 3,000 μ. In addition,
The whetstone should be of a material suitable for the raw material.

The pulverized product sent to the pulverizing chamber 4b rides on the swirling airflow B and collides with the groove of the corrugated lining plate 12 to be further pulverized. The pulverized material that turns while continuously colliding with the corrugated lining plate 12 is finely pulverized and has a layered distribution according to the particle size in the collection annular body 4d. That is, the secondary fine powder 17 is classified into an upper layer, and the coarse particles 18 are classified into a lower layer, and are separately conveyed to a secondary fine powder recovery pipe 13 and a coarse particle reflux pipe 14, respectively.

The amount of the pulverized material flowing into each tube is adjusted by valves 19 and 20 provided in the secondary fine powder recovery tube 13 and the coarse particle reflux tube 14, respectively. These valve elements 19,
By appropriately managing the opening degree of the 20, an accurate layered distribution can be realized. A cooling chamber 21 is provided outside the casing 4 to prevent the temperature of the crushed material from rising.

The coarse particle reflux pipe 14 feeds the coarse particles 18 that have not yet been sufficiently pulverized from the charging pipe 9 between the two grindstones, and performs grinding and collision grinding again. As a result, the secondary fine powder 17 pulverized to a desired particle size is sent to the secondary fine powder recovery tube 13 from the collection ring 4d.

[0024]

As described above, the pulverizing apparatus of the present invention grinds the raw material to be pulverized with the grindstone, and at the same time, discharges it to the outside of the grindstone by the action of the rotating blades on the discharge airflow. Since the corrugated lining plate is detachably attached to the surface to be ground, it is possible to finely pulverize at room temperature even if the material is difficult to grind, and it is possible to obtain ultra-fine particles with a finer particle size because collision grinding is performed after grinding. . Since the corrugated lining plate is a detachable part, it can be easily replaced and the one that matches the raw material can be selected.

Furthermore, since the casing is provided with a collecting annular body, the pulverized material can be distributed in layers according to the particle size. Powder can be efficiently obtained, and there is no danger of coarse particles being mixed into the product,
Stable pulverization becomes possible.

Further, the grinding device according to the second aspect uses a fixed grindstone and a rotary grindstone provided with a radial deep feed groove for feeding the raw material to be ground on the surface other than the flat grinding surface, so that the feeding action can be extremely increased. it can. In the crushing device according to the third aspect, since the crushing and cutting cutter is provided and the cylindrical body for collecting the fine powder generated by the crushing and cutting cutter is erected at the opening, the fine powder can be efficiently collected. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a crusher.

FIG. 2 is a sectional view showing a II-II section in FIG. 1;

FIG. 3 is a longitudinal sectional view of a conventional pulverizing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crusher 2 Fixed grindstone 2a Opening 2b Flat grind surface 3 Rotating grindstone 3b Flat grind surface 4 Casing 4d Collection circular body 6 Turntable 8 Rotor blade 12 Wavy lining plate 13 Secondary fine powder collection pipe 14 Coarse Particle reflux tube 15 Raw material to be crushed 17 Secondary fine powder 18 Coarse particles

Claims (3)

[Claims] 1. A fixed whetstone having an opening for charging raw material to be ground via a charging pipe at the center and having a flat grinding surface on an outer peripheral portion, and a flat grinding wheel disposed below and opposed to the fixed whetstone. A rotating grindstone having a grinding surface, a rotating blade attached to a rotating disk to which the rotating grindstone is attached, and generating a discharge airflow toward the outside of the grindstone between the opposing surfaces of the two grindstones, and both grindstones provided inside and flat A crusher comprising a casing for accommodating the crushed material that has been crushed between the crushing surfaces and discharged to the outside of the grindstone by the discharge airflow while rotating the crushed material, and a recovery pipe body that communicates the crushed material that is circulated to the casing and sends out the crushed material by the discharge airflow. In the apparatus, the casing includes a corrugated lining plate detachably attached to a surface on which the revolving crushed material collides, and a collecting annular body for distributing the crushed material in a layered manner in accordance with a particle diameter. For this collection A fine powder collection pipe communicating with the upper end of the annular body, a coarse particle reflux pipe communicating with the lower end of the collection annular body and connected to the charging pipe, and flow rate adjustment of the fine powder recovery pipe and the coarse particle reflux pipe A crushing device comprising a mechanism. 2. The crusher according to claim 1, wherein the fixed grindstone and the rotary grindstone are provided with a radial deep feed groove for feeding the raw material to be crushed on a surface other than a flat grinding surface. 3. A rotary grinding stone is provided with a coarse cutting cutter fixed to a rotating shaft, and the casing is provided with a cylindrical body for collecting fine powder generated by the coarse cutting cutter at the opening. The crushing device according to claim 1, wherein the crushing device is provided.