JPH02111460A - Colliding type gas stream pulverizer - Google Patents

Abstract

PURPOSE:To efficiently pulverize powdery material containing resin or material having stickness by forming colliding face of a colliding plate to a right angle pyramid, rectangular pyramid or slanting pyramid shape having >=55 deg. and <90 deg. inclination. CONSTITUTION:The colliding face of the colliding plate 4 arranged as facing to outlet of an accelerating tube 3 is formed to the right angle pyramid, rectangular pyramid or slanting pyramid shape having inclination of >=55 deg. and <90 deg. to the accelerating pipe 3. By forming the colliding plate face to such a shape, the raw material powder 7 blowing from the accelerating tube 3 together with compressed air is further pulverized dy secondarily colliding further against the faced pulverizing wall 6 after pulverizing by colliding against the colliding plate 4. By this method, dust concn. does not come to raise at near the colliding plate 4, and even in case the pulverizing material is the resin or the material having the stickness, this can be efficiently pulverized without developing welding, agglomerates and coarse grains.

Description

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

[Conventional technology] Collision type air flow crusher using jet stream.

The purpose is to place raw material powder on a jet stream, cause it to collide with each other, and use the impact force to pulverize it.

Conventionally, as shown in FIGS. 6 and 7, the collision plate used in such a crusher is a flat plate that is perpendicular to or inclined at 45 degrees to the direction of the jet stream carrying the raw material powder, that is, the acceleration tube. I've been exposed to it.

To further explain based on the state diagram in FIG. 6, the coarse raw material powder from the classifier is supplied to the accelerating tube 3 from the inlet l,
The raw material powder is struck against the collision plate 4 by the jet stream blown out from the nozzle 2, is pulverized by the impact force, and is discharged from the discharge port 5 to the outside of the yarn. The same applies to the case of FIG. In addition, FIG. 8 shows B- in FIGS. 6 and 7.
A sectional view taken along line B' is shown.

[Problems to be Solved by the Invention] However, in the conventional example described above, the collision plate is flat and is perpendicular or inclined at 45 degrees with respect to the acceleration tube, and therefore has the following drawbacks.

(1) When the angle of the collision plate is perpendicular to the accelerator tube and resin or sticky materials are crushed, the local heat generated during the collision will generate fusion, agglomerates, coarse particles, etc. This makes stable operation of the machine difficult and causes a decrease in crushing capacity. Therefore, it cannot be used above a certain dust concentration.

(2) The angle of the collision plate is 45 degrees with respect to the accelerator tube, and when crushing resin or sticky materials, the above disadvantages are rare, but it is used for crushing when colliding. The impact force is small and the crushing capacity is 1/2 to that of a right-angled collision plate.
The ability drops to 1/1.5.

[Means and effects for solving the problems] The purpose of the present invention is to solve the above-mentioned problems, and to prevent powders containing resins and adhesives from melting, agglomerates, and coarse particles. It is an object of the present invention to provide a pulverizer that efficiently pulverizes without causing the generation of .

That is, the present invention provides an acceleration tube that conveys and accelerates powder with high-pressure gas, and a collision plate that crushes the powder ejected from the acceleration tube by impact force, in a crushing chamber opposite to the outlet of the acceleration tube. In this collision-type air flow mill, the powder is dispersed in substantially the entire circumferential direction from the collision plate surface, so that the powder efficiently collides with the opposing wall of the crushing chamber, and is pulverized by the collision. The collision plate surface of the plate is shaped like a right pyramid or oblique pyramid having an inclination of 6° or more and less than 80° with respect to the acceleration tube.

According to the present invention, in order to solve the problem of deterioration of the crushing ability due to fusion, agglomerates, and coarse particles that occur when resin or sticky materials are crushed, As shown in Figure 4, the collision plate surface should be at least 60 degrees to the acceleration tube.
It was made into a pyramidal shape with an angle of less than 0°.

By doing this, when resin or sticky materials are pulverized, fusion, agglomerates, and coarse particles that occur when the angle of the collision plate is 90" with respect to the accelerator tube will not occur, and the dust concentration during pulverization will be reduced. It was possible to rise.

Furthermore, by using such a collision plate, it has become possible to cause the powder that collides with the collision plate and is crushed and bounced back with good dispersion to collide with the crushing chamber for a secondary collision, thereby further increasing the crushing efficiency. . In addition, by limiting the distance between the accelerator tube and the collision plate and the distance between the collision plate and the crushing chamber wall, more efficient crushing by secondary collision is possible, and the angle of the collision plate is 90' with respect to the acceleration tube. The crushing capacity was substantially improved by 20 to 60% compared to the conventional one.

Hereinafter, the present invention will be explained in detail with reference to Examples.

[Example] Figure 1, Figure 2, and Figure 3 show the first example of the present invention, and Figure 1 best illustrates the characteristics of the raw material powder pulverization of the present invention. FIG. 2 is a state diagram showing A-A in FIG. 1.
FIG. In Fig. 1, 1 is the powder raw material input port to the crusher, 2 is the compressed air supply nozzle used when pulverizing the powder raw material, 3 is the acceleration tube that accelerates the powder with compressed air, and 4 is the acceleration tube outlet 5 is a discharge port for discharging the crushed powder and air, and 6 is a wall of the crushing chamber. Moreover, FIG. 3 is a projection view showing the regular hexagonal pyramid shape of the collision plate 4, and the angle θ with respect to the acceleration tube is 80°.
It is a collision plate with an inclination of .

Here, the toner raw material consisting of the mixture of the above formulation was melt-kneaded at about 180° C. for about 1.0 hours, cooled and solidified, and coarsely ground into particles of 100 to 100 mm in size using a hammer mill to obtain a raw material powder.

When the raw material powder is supplied from the input port 1, the raw material powder is struck by the compressed air blown from the nozzle 2 against the collision plate 4, and is pulverized by the impact force. At the same time, this collision plate 4 has a regular hexagonal pyramid shape inclined at 80 degrees with respect to the acceleration tube 3, and disperses the collided raw material powder in the entire circumferential direction, and the collision plate 4 has a shape of a regular hexagonal pyramid inclined at an angle of 80 degrees with respect to the acceleration tube 3. There will be a secondary collision, where it will be further shattered.

The pulverized raw material powder is smoothly conveyed to the classifier through the discharge port 5, the fine powder is removed as a product, and the coarse powder is fed back into the classifier from the input port 1 together with the raw material powder.

In this way, as the collision plate 4, 80
When a regular hexagonal pyramid shape with an inclination of ° is used, the raw material powder that collides is dispersed in the entire circumferential direction, bounces off, and secondarily collides with the opposing crushing wall. For this reason, the dust concentration near the collision plate does not increase, and fusion, agglomerates, and coarse particles do not occur, so the pulverization efficiency is not inferior, and products with a sharp particle size distribution can be obtained, and the pulverization capacity was confirmed to improve.

Embodiment 2 FIG. 4 shows a second embodiment of the present invention, in which the toner material used in Embodiment 1 was replaced with a rectangular pyramid-shaped collision plate which was angled at 80 degrees with respect to the acceleration tube. When crushed in the same manner as in Example 1, the same results as in Example 1 were obtained.

Embodiment 3 FIG. 5 shows a third embodiment of the present invention, in which a collision plate in the shape of a beveled pyramid is used, which is angled at 80 degrees with respect to the acceleration tube. When pulverized in the same manner as in Example 1, the same results as in Example 1 were obtained.

Comparative Example 1 When the toner material used in Example 1 was crushed in the same manner as in Example 1 using a flat collision plate perpendicular to the conventional acceleration tube 3 as shown in FIG. 10 ingredients
The crushing capacity to obtain gm was 0.0% compared to Example 1.
6 times lower.

Comparative Example 2 When the toner material used in Example 1 was pulverized in the same manner as in Example 1 using a flat collision plate that was angled at 45 degrees with respect to the conventional acceleration tube 3 as shown in FIG. Since the impact force becomes weaker when colliding with the plate surface, the crushing force is lower than that of Comparative Example 1.

Comparative Example 3 The toner material used in Example 1 was placed at 45° with respect to the acceleration tube 3.
When pulverization was performed in the same manner as in Example 1 using a regular hexagonal pyramid-shaped collision plate, the pulverization ability was comparable to that of Comparative Example 2 because the impact force was weakened when the powder collided with the collision plate surface.

Each of the above mentioned items is listed in the table below.

(1) - Processing capacity 1 is the limit at which fused materials will occur if processing is performed faster than this.

[Effects of the Invention] As explained above, by making the shape of the collision plate into a specific rectangular complex or oblique pyramid shape, it is possible to prevent the generation of fusion, agglomerates, coarse particles, etc. during the grinding of raw material powder, and the device enables stable operation. Moreover, strong impact force can be maintained until the secondary collision of raw material powder. For this purpose, the conventional crushing capacity has been increased to 20%.
It can be improved by ~80%.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 show a first embodiment of the present invention.
The figure is a state diagram that best represents the characteristics of the raw material powder pulverization of the present invention, and FIG. 2 is a sectional view taken along the line AA' in FIG. 1. 3, 4, and 5 show other embodiments of the present invention, in which FIG. 3 shows a right pyramid-shaped collision plate, FIG. 4 shows a right pyramid-shaped collision plate, and FIG. The figure is a projected view of an oblique pyramid-shaped collision plate. Figures 6, 7, and 8 show conventional examples. Figure 6 shows the collision plate having a right angle to the acceleration tube, and Figure 7 shows the collision plate having an angle of 45° with respect to the acceleration tube. FIG. 8 is a sectional view taken along line BB' in FIGS. 6 and 7. 1... Powder raw material input port 2... Compressed air supply nozzle 3... Accelerator tube 4... Collision plate 5... Discharge port 6... Grinding chamber wall 7... Raw material powder

Claims (1)

[Claims] A collision-type air flow crusher comprising an acceleration tube that conveys and accelerates powder using high-pressure gas, and a collision plate that crushes the powder ejected from the acceleration tube by impact force in the crushing chamber opposite the acceleration tube outlet. , a right pyramid having a collision plate surface of the collision plate with an inclination of 55° or more and less than 90° with respect to the acceleration tube;
Or, an impact type air flow crusher characterized by having a right pyramid shape or an oblique pyramid shape.