JPH0326350A - Collision type air grinder - Google Patents

Abstract

PURPOSE:To enhance treating capacity by specifying the spreading angle of an acceleration pipe and also forming the collision face of a collision member into a hexagonal pyramid shape which has a specified angle for the direction of the acceleration pipe. CONSTITUTION:An acceleration pipe 2 is formed of a monotonic diffuser which has a spreading angle theta not smaller than 7 degrees and not larger than 9 degrees. A collision member 6 is formed into a pyramid shape whose collision face is regulated to an angle not smaller than 55 degrees and smaller than 90 degrees for the acceleration pipe. Thereby when resin and substance having tackiness are ground, melt sticking, a coagulated material and coarse particles are not caused. Therefore rise of dust concn. at a time of grinding is enabled and throughput of pulverization can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an impingement type air flow crusher using a jet stream (high pressure gas).

[Prior art] A collision-type air flow crusher using a jet stream places the material to be crushed on the jet stream to form a particle mixed air stream, injects it from the outlet of an accelerating tube, and places this particle mixed air stream in front of the outlet of the accelerating tube. The object is caused to collide with the collision surface of a collision member, and the object to be crushed is crushed by the impact force. The details will be explained below based on FIGS. 7 and 8.

Outlet l of acceleration tube l2 connected to high-pressure gas supply nozzle 13
A collision member 16 is provided opposite to the acceleration tube 12, and by the flow of the high-pressure gas supplied to the acceleration tube 12, the material to be crushed is transported into the inside of the acceleration tube 12 from the material supply port 11 communicated with the midway of the acceleration tube 12. This is sucked and injected together with high-pressure gas to collide with the collision surface of the collision member 16, and the impact causes it to be pulverized. When the raw material to be crushed is used to crush the raw material to a desired particle size, a classifier is arranged between the raw material supply port 11 and the discharge port 17 to form a closed circuit, and the raw material to be crushed is fed to the classifier. The coarse powder is supplied from the material to be crushed supply port 11, the material is pulverized, and the pulverized material is discharged from the discharge port 17.
Then, the powder is returned to the classifier and classified again, and the resulting fine powder becomes a finely ground product with a desired particle size.

[Problems to be Solved by the Invention] However, in the conventional example described above, the divergence angle θ of the accelerator tube is 6.5 degrees or less, which is narrow, so when the high-pressure gas flow rate is increased, a pressure loss occurs in the accelerator tube, and the purpose The drawback was that it was not possible to improve the pulverization capacity.

In addition, in the conventional example, as shown in FIGS. 7 and 8, the collision surface of the collision member is a flat plate that is perpendicular to or inclined at 45 degrees to the direction of the particle mixture airflow carrying the object to be crushed, that is, the acceleration tube. has been used, and has the following drawbacks:

(1) If the angle of the collision surface is perpendicular to the acceleration tube,
When pulverizing resin or sticky materials, local heat generation during collision generates fusion, agglomerates, coarse particles, etc., making stable operation of the device difficult and causing a reduction in pulverizing capacity. Therefore, it cannot be used above a certain dust concentration.

(2) When the angle of the collision surface is inclined at 45 degrees with respect to the acceleration tube, the above-mentioned drawbacks are less likely to occur when crushing resin or sticky materials. However, the impact force used for pulverization during collision is small, and the pulverization capacity is 172 to 1/1.1. It falls to 5.

An object of the present invention is to solve the above-mentioned problems and provide an impingement-type air flow mill that efficiently grinds.

[Means for Solving the Problems (and Effects)] The present invention is characterized by at least an acceleration tube that transports and accelerates the material to be crushed by high-pressure gas, and a collision member provided opposite to the outlet of the acceleration tube. In the collision type air flow crusher having a collision surface, the expansion angle θ of the acceleration tube is 7 degrees or more and 9 degrees or less, and the collision surface of the collision member is 55 degrees or more with respect to the direction of the acceleration tube. The impingement air flow crusher has the shape of a regular hexagonal pyramid, a hexagonal pyramid, or an oblique hexagonal pyramid with an inclination of less than 90 degrees. In other words, the present invention prevents the generation of fusion, agglomerates, coarse particles, etc. when powder containing resin or sticky material is pulverized, and the powder is pulverized substantially from the collision surface in the entire circumferential direction. This makes it possible to further improve the grinding efficiency by dispersing the particles into the grinding chamber and efficiently causing secondary collisions with the opposing walls of the grinding chamber.

Hereinafter, the present invention will be explained in detail based on the drawings.

1 to 6 are schematic diagrams showing one embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. A sectional view and FIG. 4 are projection views showing the collision member 6 (regular hexagonal pyramid shape), and FIGS. 5 and 6 are projection diagrams showing modifications of the collision member 6 (hexagonal pyramid shape, oblique hexagonal pyramid shape).

In FIG. 1.2, the acceleration tube 2 is connected to a high-pressure gas supply nozzle 3, similar to the conventional collision type air flow crusher shown in FIG. is provided. The accelerator tube 2 is a monotonically expanding tube with an expansion angle θ of 7 degrees or more and 9 degrees or less. Furthermore, if the spreading angle θ is in the range of 7.5 degrees or more and 8.5 degrees or less, it is optimal because it improves the pulverization processing capacity. Next, the operation of the above embodiment will be explained.

In order to improve the pulverization processing capacity of an impingement-type airflow pulverizer, it is effective to increase the flow rate of high-pressure gas that provides the impact force for pulverization. In the case of an accelerating tube where the angle is less than 7 degrees, a pressure loss occurs within the accelerating tube, and the pulverization ability cannot be improved to the desired ability (according to the increase in the flow rate of high-pressure gas). On the other hand, in the case of an accelerating tube with a divergence angle θ exceeding 9 degrees, as the angle of the accelerating tube widens, the cross-sectional area of the accelerating tube outlet 4 increases, and conversely, the velocity of the particle mixture flow injected from the accelerating tube increases. is not used to improve the pulverization ability. Therefore, an accelerating tube having a divergence angle θ of 7 degrees or more and 9 degrees or less, excluding the above-mentioned range, is most suitable for improving the pulverization processing capacity.

Further, the collision member 6, as shown in FIGS. 1 to 6,
By making the collision surface into a pyramid shape with an angle of 55 degrees or more and less than 90 degrees with respect to the acceleration tube, when resin or sticky materials are crushed, the fusion that occurs when the collision surface angle is 90 degrees with respect to the acceleration tube can be reduced. No deposits, agglomerates, or coarse particles were formed, making it possible to increase the dust concentration during grinding.

Furthermore, by using such a collision surface, it has become possible to cause the powder that collides with the collision surface and is crushed and bounced back with good dispersion to collide into the crushing chamber for a secondary collision, further increasing the crushing efficiency. . In addition, by limiting the distance between the accelerating tube and the collision member and the distance between the collision member and the crushing chamber wall, more efficient crushing by secondary collision is possible, and the angle of the collision surface with respect to the accelerating tube is At 90 degrees, the crushing ability was substantially improved compared to the flat one.

[Examples] Hereinafter, the present invention will be described in detail based on Examples and Comparative Examples.

A toner material consisting of a mixture of the above formulation is heated and kneaded, and after cooling and solidifying, a hammer mill is used to give a powder of 100-1000
Coarsely pulverized into particles of #Lm as the raw material for the material to be pulverized; d. =11mm, d2=29mm, L=
133 mm, θ = 7.7 degrees (see Figure 2), and a regular hexagonal pyramid-shaped collision member with angles ψ of 55 degrees and 80 degrees with respect to the acceleration tube shown in Figure 4. 6. When the above-mentioned toner material was pulverized to a volume average diameter of 12 particles by supplying pressurized air of 100 kgf/cm,
The processing capacity was 4.0 times that of the conventional example (Comparative Example 1).

The raw material of the toner to be crushed used in Example 1 was d l++
11mm, d*= 29mm, L= 133m
The same conditions as in Example 1 were carried out using a pulverizer equipped with an accelerator tube with m, θ = 7.7 degrees and a hexagonal pyramid-shaped collision member (ψ, minimum 75 degrees, maximum 80 degrees) shown in Fig. 5. When the powder was pulverized to a volume average diameter of 12 μm, the processing capacity was 4.0 times that of the conventional example.

The raw material of the toner to be crushed used in Example 1 was d+s 11
mm, dz” 29mm, L= 133mm,
Accelerator tube with θ = 7.7 degrees and oblique hexagonal pyramid-shaped collision member shown in Fig. 6 (ψ min. 55 degrees,
When the material was pulverized to a volume average diameter of 12 m using a pulverizer having a maximum angle of 80 degrees under the same conditions as in Example 1, the throughput was 3.8 times that of the conventional example.

11' The toner raw material to be ground used in Example 1 was pulverized to a volume average diameter of 12 μm using a conventional pulverizer shown in FIG. The configuration of the conventional pulverizer described here is d + =9 mm.
d2; 24mm, L = 153mm, θ =
It consists of a 5.6 degree acceleration tube and a planar impact member that is perpendicular to the acceleration tube direction. The processing capacity at this time is at the limit, where if the processing is carried out faster than this, fused materials will be generated and clog the material supply port 1 and the classifier.

The raw material for the toner to be crushed used in Example 1 for Group L was prepared under the same conditions as d+ = 11 mm, cL = 29 +++ m, L
= 133 mm θ = 7.7 degrees When finely pulverized to a volume average diameter of 12 μm using a pulverizer having an acceleration tube and a flat collision member perpendicular to the direction of the acceleration tube, the melt The formation of kimono was observed, and the processing capacity (the limit at which no fused material was generated) was 1.3 times that of Comparative Example 1.

The results of Examples 1 to 3 and Comparative Examples 1 and 2 are shown in Table 1 below.

(Margin below) 9 10 Part 1 table (*) Comparative Example 1 is set to 1.0 (standard).

(※※) 1.0 (standard) is set at the limit of processing capacity, as fused materials will occur if processing is performed faster than this.

A toner material consisting of a mixture of the above formulation is heated and kneaded, and after cooling and solidifying, a hammer mill is used to give a powder of 100-1000
The toner material was coarsely pulverized to pm particles as the material to be pulverized, and the above toner material was pulverized to a volume average diameter of 12 μm using the same pulverizer as in Example 1 under the same conditions.Conventional Example (Comparative Example 3) The processing capacity was 1.7 times that of the previous one.

Kouou Group 1 The raw material for toner to be crushed used in Example 4 was finely pulverized to a volume average diameter of 12 pm using the same pulverizer as in Example 2 under the same conditions, and compared to the conventional example (Comparative Example 3) The processing capacity was 1.7 times higher.

Material 1 The raw material for toner to be crushed used in Example 4 was finely pulverized to a volume average diameter of 12 pm using the same pulverizer as in Example 3 under the same conditions, and the result was 1.6 times that of the conventional example. processing capacity.

3'1 The raw material of the toner to be crushed used in Example 4 was treated under the same conditions.
It was pulverized to a volume of 11 l2 and an average diameter of 12 μm using the conventional pulverizer used in Comparative Example 1.

Comparison 1 The raw material for toner pulverization used in Example 4 was pulverized to a volume average diameter of 12 pm using the same pulverizer as in Comparative Example 2 and under the same conditions. It had twice the processing power.

The results of Examples 4 to 6 and Comparative Examples 3.4 are shown in Table 2 below.

Table 2 [Effects of the invention] As explained above, when the divergence angle θ of the accelerator tube is set to 7 degrees or more, 9
By making the impact plate less than 100% and making the shape of the collision plate into a specific pyramidal or oblique pyramidal shape, the generation of fusion, agglomerates, coarse particles, etc. during the crushing of powder raw materials is prevented, and stable operation of the equipment is achieved. enable. Furthermore, it is possible to increase the throughput of pulverization without increasing the size of the device.

[Brief explanation of drawings]

1 to 6 are schematic diagrams of a pulverizer embodying the present invention, FIG. 2 is a sectional view of the main part of FIG. 1, and FIG. 3 is a sectional view taken along line AA' in FIG. 1. , FIGS. 4 to 6 are projection views of the collision member. Moreover, FIGS. 7 and 8 are schematic diagrams showing conventional examples. 11 - Material to be crushed supply port 12 - Acceleration pipe 13 - High pressure gas supply nozzle 14 - Acceleration pipe outlet 15 - Grinding chamber 1 3 1 4 6, l6 - Collision member 7, 17 - Discharge port

Claims (1)

[Claims] (1) In a collision type air flow crusher having at least an acceleration tube that conveys and accelerates the material to be crushed by high-pressure gas, and a collision surface of a collision member provided opposite to the outlet of the acceleration tube, the expansion angle of the acceleration tube Any one of a regular hexagonal pyramid, a hexagonal pyramid, and an oblique hexagonal pyramid, in which θ is 7 degrees or more and 9 degrees or less, and the collision surface of the collision member has an inclination of 55 degrees or more and less than 90 degrees with respect to the acceleration tube direction. A collision type air flow crusher characterized by its shape.