JPH01317554A - Air-blast crusher - Google Patents

Abstract

PURPOSE:To permit crushing efficiency to be improved, without effecting the preliminary crushing of the materials of a large size, as is the case with the conventional method, and hence in a short time by providing the center core of a large mass in the center of a crushing chamber. CONSTITUTION:A material supply pipe 13 is provided on the side wall of a crushing chamber 1 and a plurality of crushing nozzles 3 facing approximately toward the center of the crushing chamber 1 below the supply pipe 13. An air-blast is delivered through the crushing nozzles 3 to accelerate the crushing of the materials in the crushing chamber 1. A center core 15 of a large mass is provided in the center of the crushing chamber 1, thereby ensuring the crushing of the materials of various sizes by direct collision therewith, particularly effective in crushing materials of large size. For this reason, the crushing operation is completed in a short time without the need of any additional crusher conventionally required for pretreatment, resulting in a remarkable improvement of productivity.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air-flow pulverization device for pulverizing granular raw materials (hereinafter referred to as raw materials) such as food additives, organic pigments, and other organic compounds. be.

[Prior Art] The case of crushing wax such as a food additive will be explained.

Conventionally, the wax raw material is usually coarsely ground to a size of 25 mm or less, and then used as a raw material to be finely ground to a size of 100 mesh or less.

The most commonly used device of this type is a high-speed rotary crusher such as an atomizer.

On the other hand, since the wax has a low melting point of 40 to 70°C, it tends to adhere to the inner wall of the pulverizer due to the heat generated during pulverization.

For this reason, it is extremely difficult to use the above-mentioned crushing device to crush the powder to a fineness of 100 meshes or less.

Therefore, in recent years, airflow type crushing devices have come into use.

One such device is one in which the raw material passes through a crushing nozzle, but if the raw material is too large it will not pass through the nozzle, so it must be pre-pulverized. Therefore, a device for pre-pulverization is required.

Further, as another example of this apparatus, there is one in which the jet stream and the raw material are introduced separately into the grinding chamber, and this system will be described below.

As a representative example of this device, Japanese Patent Application Laid-Open No. 60-1685
No. 47 (see Figures 3 and 4).

This device consists of 201 crushing nozzles directed upward from the bottom of the crushing chamber 1 and a plurality of crushing nozzles 3 provided in the side chambers of the crushing chamber 1. Its axis is slightly downward from the horizontal direction,
- They intersect at point O and are arranged at equal valve angles so that the resultant force is zero.

4 is a compressed air pipe connected to the grinding nozzle 2.3.

A classifier 5 consisting of a classifying rotor 7 rotated by a drive means 6 is installed above the crushing chamber, and
The machine 5 is connected to a dust collector 9 through a pipe 8. It has a structure connected to an exhaust fan 10.

In the apparatus, the raw material is fed into the grinding chamber from the hopper 11 by the screw feeder 12 to form a predetermined raw material layer. The upper surface of this raw material layer is at least above the grinding nozzle 3.

With the raw material stored as described above, the crushing nozzle 2,
When a jet stream is ejected from 3, the raw material is accelerated by this jet stream, and due to this acceleration, the raw materials repeatedly collide and rub against each other and are pulverized.

The fine powder rises with the airflow generated by suction by the exhaust fan 10, and is classified at a predetermined branch point by the airflow classifier 5.

The classified fine powder flows from the discharge passage 8 to the dust collector 9 along with the airflow.
The fine powder is taken out as a product, and the air flow is discharged to the atmosphere through the exhaust air 11i10.

According to the pulverizer, even if the raw material size is relatively large, about 25 mm, the raw material is supplied separately from the pulverizing nozzle 2.3, so it does not interfere with the raw material supply and is finely pulverized. Ru.

[Problems to be Solved by the Invention] However, in the conventional method, when the size of the raw material is large, the processing capacity is significantly reduced. The reason is that the raw materials collide with each other and are crushed due to friction. In other words, various cases can be considered, such as large particles and small particles, small particles with each other, and large particles with each other, but even if a large particle collides with a small particle, it is difficult to decontaminate it, and it is necessary to pulverize it to the desired particle size. The problem is that it takes a lot of time to do so.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an air flow type pulverizer that can improve the pulverizing effect in a short time even when the raw material size is relatively large, without requiring preliminary pulverization as in the conventional method.

[Means for Solving the Problems] In order to achieve the above object, in the air flow crushing apparatus of the present invention, a raw material supply pipe is provided on the side wall of the crushing chamber, and a raw material supply pipe is provided below the supply pipe, and the In an air flow type crushing apparatus, a plurality of crushing nozzles are provided that face approximately toward the center of the chamber, and the raw material in the crushing chamber is accelerated and crushed by jet streams ejected from the crushing nozzles. This was achieved by erecting a large center core.

Further, the center core is made of ceramic.

[Operation] The raw material stored in the crushing chamber is accelerated by the jet stream ejected from the crushing nozzle, collides with the center core, and is crushed.

Therefore, particularly large particles of the raw material collide directly with the center core, which has a much larger mass, resulting in a large pulverizing effect and being pulverized quickly and reliably.

[Example] An example of the airflow type crushing apparatus of the present invention will be described with reference to FIGS. 1 and 2.

1 is a cylindrical grinding chamber; 3 is a grinding nozzle provided below the side wall of the grinding chamber 1; two nozzles are arranged substantially horizontally toward the center of the grinding chamber 1; . 4 is a compressed air pipe.

Reference numeral 5 denotes a classifier installed at the upper part of the crushing chamber 1, in which a classifying rotor 7 inside the crushing chamber 1 is rotated at high speed by a drive motor 6.

8 is a fine powder discharge passage, and a dust collector 9. It is connected to the exhaust fan 10.

Reference numeral 13 denotes a raw material supply pipe provided on the side wall of the grinding chamber above the nozzle 2, which faces diagonally downward.The tip of the supply pipe opens into the grinding chamber 1, and a raw material hopper 11 is connected to the rotor feeder at the rear. 14.

The above configuration is not much different from the conventional configuration described above.

Next, the characteristic parts of the present invention will be described.

Reference numeral 15 denotes a cylindrical center core located on the central axis of the grinding chamber 1 and erected from the bottom, and is fixed to the bottom plate 16 of the grinding chamber 1 with bolts 17. and,
The upper end of the center core 13 extends above the position of the crushing nozzle 3 for reasons described later.

Next, the operation of the above embodiment will be described.

The raw material in the raw material hopper 11 flows into the crushing chamber 1 via the rotary feeder 14 and the supply pipe 13, and is stored therein. The upper surface of the stored raw material layer is above the crushing nozzle 3 as shown in the figure.

In the raw material storage state, compressed air is supplied to the crushing nozzle 3 via the compressed air pipe 4. The compressed air supplied to the crushing nozzle 3 becomes a jet stream and is ejected into the raw material layer. The raw material is accelerated by this jet flow, and collides with the center core 15 with this force and is crushed.

In this way, the raw material collides with the center core 15, which has a much larger mass than the raw material, so that it is pulverized reliably and in a short time.

In particular, large raw material particles can be pulverized efficiently.

Then, the crushed fine powder is discharged! It rises with the airflow generated by the operation of tlJ10, and is classified at a predetermined classification point in the classifier 5. The airflow containing fine powder that has passed through the classifier 5 passes through a discharge passage 8 and enters a dust collector 9, where the fine powder is collected and taken out as a product.
It is then released into the atmosphere. On the other hand, the fine powder that has not passed through the classifier 5 falls below the crushing chamber and is crushed again.

In addition, the shape of the center core 5 in the above-mentioned embodiments may be triangular prism, polygonal prism, etc. in addition to the above-mentioned cylinder, or may be cylindrical.

Further, as the material of the center core 15, stainless steel can be preferably used in addition to wear-resistant ceramic.

[Effects of the Invention] Since the present invention is configured as described above, it produces effects as described below.

Since a center core with a large mass is erected at the center of the grinding chamber, raw materials of various sizes collide directly with the center core and are reliably crushed, but the crushing effect is especially great for large raw materials.

For this reason, the powder can be ground in a short time without using a conventional pre-processing grinder, resulting in a significant improvement in productivity.

Moreover, since the center core is simply installed upright within the crushing chamber, the structure is simple and the manufacturing cost is low.

In addition, since the crushing nozzle simply points its axis toward the center core, it does not require as much precision as conventional nozzle axes that precisely align, making it easy to manufacture and requiring no adjustment. Become.

In addition, by making the center core of ceramic, it exhibits great wear resistance and has a long life.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, and FIG.
3 is a longitudinal sectional view showing a conventional example, and FIG. 4 is a diagram showing the positional relationship of each nozzle in the conventional example.

Claims (2)

[Claims] (1) A raw material supply pipe is provided on the side wall of the grinding chamber, and a plurality of grinding nozzles are provided below the feed pipe and facing approximately toward the center of the grinding chamber. An air current pulverizer for accelerating and pulverizing raw materials in a pulverizing chamber, characterized in that a center core with a large mass is erected at the center of the pulverizing chamber. (2) The pneumatic pulverizer according to claim 1, wherein the center core is made of ceramic.