JPH08141429A - Pulverizing impact plate of impact type pneumatic pulverizer - Google Patents

Abstract

PURPOSE: To provide a pulverizing impact plate made of a material having high pulverizing capacity per one impact. CONSTITUTION: A jet inlet 1 for high pressure gas output from a compressor is connected to an accelerating pipe 2. To the upper wall of the accelerating pipe 2, a hopper 3 for feeding powder to be pulverized is connected, and a jet outlet 4 of the accelerating pipe 2 is connected to a pulverizing chamber 5. When, an impact plate 6 satisfying the formula, Vickers hardness (kg/mm<2> ) ×0.8 + elastic modulus (kg/mm<2> ) × 0.02 > 1,800, is housed in the pulverizing chamber 5, pulverizing capacity per one impact is improved, and even if pulverizing through is increased, the material to be pulverized is pulverized so that a material accumulation in the hopper 3 may not be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushing collision plate of a collision-type airflow crusher for producing powder and granules,
For example, the present invention relates to a crushing collision plate of a collision-type airflow crusher for producing toner used in copiers, printers and the like.

[0002]

2. Description of the Related Art A collision type airflow crusher is used in the step of crushing powder to be crushed in a toner manufacturing process. Generally, in this crusher, the high-pressure gas injected into the accelerating tube accelerates and conveys the powder to be crushed introduced from the hopper through the accelerating tube toward the crushing chamber. The crushed powder accelerated by the acceleration tube is
It is crushed by colliding with a crushing collision plate installed in front of the acceleration tube. The crushed powder to be crushed is discharged from the discharge port of the crushing chamber and is transported to the classifier together with the newly input powder to be crushed. The crushed powder transported to the classifier is classified according to the crushed diameter. The powder that satisfies the preset crushing diameter is sent to the next step, and the powder that does not satisfy the crushing diameter is
It is re-introduced into the hopper together with the newly fed powder to be crushed.

That is, the crushing collision plate is for colliding the crushed powder with the collision surface to crush it.
Alumina (92%) is used as a general material.

[0004]

However, with the material of the above-mentioned conventional crushing collision plate, since the crushing capacity in one collision is insufficient, there are many crushed powders which are insufficiently crushed when the processing amount is increased. There is a drawback in that the amount of hoppers generated and re-charged into the hopper after classification increases, and thus the amount of material accumulated in the hopper increases. Then, the pool causes a particle size variation, which causes a normal production to be impossible.

In view of the above problems of the conventional crushing collision plate, it is an object of the present invention to provide a crushing collision plate made of a material having a high crushing capacity per collision. Is.

Further, in the material of the conventional crushing collision plate represented by alumina (92%), the cooling effect is insufficient due to lack of Vickers hardness related to crushing efficiency and low thermal conductivity of the crushing collision plate. There is a problem that it cannot be sufficiently transmitted to the crushing collision plate, and it is difficult to increase the crushing capacity only by using a cooling method.

In view of the above problems of the conventional crushing collision plate, the present invention of claim 2 increases the crushing capacity when the powder to be crushed and / or the crushing collision plate is cooled by the cooling device. An object of the present invention is to provide a crushing collision plate made of a material that can be used.

[0008]

The crushing collision plate according to the present invention of claim 1 is made of Vickers hardness (kg / mm ² ) × 0.
8+ elastic modulus (kg / mm ² ) × 0.02> 1,800, which is a crushing collision plate of a collision type airflow crusher.

The crushing collision plate according to the present invention of claim 2 is characterized in that the material is Vickers hardness> 2,000 kg / mm ² and thermal conductivity> 0.15 cal / cm · sec · ° C. Is a crushing collision plate of a collision type airflow crusher having a cooling device for

[0010]

According to the present invention of claim 1, the material of any crushing collision plate is Vickers hardness (kg / mm ² ) × 0.8 + elastic modulus (kg / mm
^{Since 2} ) × 0.02> 1,800 is satisfied, the crushing collision plate can prevent the material accumulation in the hopper from increasing even if the processing amount is increased. That is, the powder to be crushed introduced from the hopper of the collision type airflow crusher containing the crushing collision plate is accelerated by the accelerating tube by the high pressure gas generator.
It is conveyed and collides with the crushing collision plate in the crushing chamber. Due to the high crushing performance of the crushing collision plate, the crushed powder that has collided with the crushing collision plate is crushed so that the material accumulation in the hopper does not increase even if the crushing amount is increased.

According to the second aspect of the present invention, the material used for the crushing collision plate of the collision type airflow crusher having an arbitrary cooling device is Vickers hardness> 2,000 kg / mm ² and thermal conductivity> 0. Since it satisfies 15 cal / cm · sec · ° C, the crushing collision plate can crush the powder to be crushed into smaller particles. That is, the powder to be crushed introduced from the hopper of the collision type airflow crusher containing this crushing collision plate is accelerated and conveyed by the accelerating pipe by the high pressure gas generator to the cooled crushing collision plate in the crushing chamber. collide. The powder to be crushed which collides with the crushing collision plate has a smaller crushing diameter due to the high crushing performance of the crushing collision plate and the improvement of the crushability due to the cooling effect, so that the processing capacity of the crusher is increased.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments.

First, the structure of a general collision type air flow crusher will be described.

FIG. 1 is a schematic diagram showing the structure of a collision type airflow pulverizer for pulverizing the powder to be crushed of the toner. That is, the injection port 1 for the high-pressure gas output from the compressor is connected to the acceleration tube 2. A hopper 3 for charging the powder to be crushed is connected to the upper wall of the acceleration tube 2, and the jet port 4 of the acceleration tube 2 is connected to the crushing chamber 5. The crushing chamber 5 accommodates a crushing collision plate 6 for crushing the powder to be crushed by collision so as to face the ejection port 4 of the acceleration tube 2. The discharge port 7 for the crushed powder crushed in the crushing chamber 5 is connected to a classifier 8 together with a new charge port for the crushed powder. The classifier 8 is connected to the hopper 3 in the next step.

Next, the operation of such a collision type airflow crusher will be described.

The high-pressure gas injected from the high-pressure gas injection port 1 into the accelerating pipe 2 accelerates and conveys the powder to be crushed from the hopper 3 in the accelerating pipe 2 toward the crushing chamber 5. The crushed powder ejected from the ejection port 4 of the acceleration tube 2 collides with the crush collision plate 6 and is crushed. The crushed powder is crushed in the crushing chamber 5
The powder is discharged from the discharge port 7 and is transported to the classifier 8 together with the newly added powder to be crushed. The crushed powder transported to the classifier 8 is classified according to the crushed diameter, the crushed powder satisfying the preset crushed diameter is sent to the next step, and the uncrushed powder is newly introduced. The crushed powder is re-charged into the hopper 3.

The material of the crushing collision plate according to the present invention of claim 1 is Vickers hardness (kg / mm ² ) × 0.8 + elastic modulus (kg / mm ² ).
It is constituted by the standard A of × 0.02> 1,800. In the collision type airflow crusher having this configuration, the crushed powder can be crushed so that the material accumulation in the hopper 3 does not increase even if the crushing amount is increased.

Here, the basis of the criterion A will be described.

The crushing by the collision type airflow crusher can be roughly divided into two. One is primary crushing by the crushing collision plate 6, and the other is secondary crushing after collision with the crushing collision plate 6. Here, the secondary pulverization refers to pulverization by collision between the reflected powder and the powder ejected from the acceleration tube or collision with the side wall of the pulverization chamber 5. Therefore, for the primary crushing, attention was paid to the hardness of the crushing collision plate 6, and for the secondary crushing, attention was paid to the speed of the powder after the collision with the crushing collision plate 6. The speed of this powder is affected by the elastic modulus of the crushing collision plate 6.

Therefore, in order to obtain the crushing efficiency of the primary crushing and the secondary crushing by the first collision for each material (a measure of how small the crushing can be done by one collision), the crushing collision plate of various materials is used. Was placed in the crushing chamber 5, and after the first collision, the crushed powder to be crushed was taken out from the discharge port 7 of the crushing chamber 5. By this work, mullite, alumina (92%), alumina
(96%)-Tank stencarbite-The crushed diameter determined by the first collision for each material of silicon carbide is shown in Table 1 together with the Vickers hardness, the elastic modulus, the A value, and the presence or absence of the material pool.

[0021]

[Table 1]

From Table 1, the A value of the material is
As the size increases from 1,440 → 1,720 → 1,860 → 2,600 → 2,760, the crushing diameter due to the first collision is 108.5
→ 92.3 → 88.7 → 79.6 → 78.3 It becomes smaller, and it can be seen that the crushing efficiency by the first collision is further improved. Further, it can be seen that if the A value is 1800 or more, the material accumulation in the hopper 3 can be reduced.

As is clear from the above description, the improvement of the pulverization efficiency by the collision at each time is the main reason for reducing the amount of pulverized powder to be pulverized which is reintroduced into the hopper 3 by the classifier 8. As a result, even if the crushing amount is increased, it becomes a basis for crushing the powder to be crushed so that the material accumulation in the hopper 3 does not increase.

The present invention according to claim 2 will be described below with reference to the drawings showing an embodiment thereof.

First, the structure of a general collision type air flow crusher with a cooling function will be described.

FIG. 2 shows a collision type air flow pulverizer with a cooling function for pulverizing the powder to be crushed of the toner. That is, the injection port 1 for the high-pressure gas output from the compressor is connected to the acceleration tube 2. A hopper 3 for introducing the powder to be crushed cooled by the cooling device 9 is provided above the acceleration tube 2.
Is connected, and the jet port 4 of the acceleration tube 2 is connected to the crushing chamber 5. A crushing collision plate 6 for crushing the powder to be crushed by collision is housed in the crushing chamber 5 so as to face the ejection port 4 of the acceleration tube 2. The discharge port 7 for the powder to be crushed in the crushing chamber 5 is connected to the classifier 8 together with the powder to be newly input. The classifier 8 is connected to the hopper 3 and the next step 10.

Next, the operation of the collision type airflow crusher will be described.

The high-pressure gas injected from the high-pressure gas injection port 1 into the accelerating tube 2 is cooled by the cooling device 9, and the accelerating tube 2 is cooled.
The powder to be crushed fed from the hopper 3 at the upper part is accelerated and conveyed toward the crushing chamber 5. The crushed powder ejected from the ejection port 4 of the acceleration tube 2 collides with the crush collision plate 6 and is crushed. The crushed powder to be crushed is discharged from the discharge port 7 of the crushing chamber 5 and is transported to the classifier 8 together with the newly input powder to be crushed. The crushed powder transported to the classifier 8 is
The crushed powder that is classified according to the crushed diameter and satisfies the preset crushed diameter is sent to the next step, and the uncrushed powder to be crushed is re-charged into the hopper 3 together with the newly-crushed powder.

The material of the crushing collision plate according to the present invention of claim 2 is constituted by the standard B of Vickers hardness> 2,000 kg / mm ² and thermal conductivity> 0.15 cal / cm · sec · ° C. . In the collision type airflow crusher having this configuration, the crushed powder that has collided with the crushing collision plate is transported to the next step after the crushing process is completed due to the high crushing performance of the crushing collision plate and the improvement of the crushability due to the cooling effect. The normal crushed diameter of the powder can be made smaller.

Here, the basis of the above-mentioned criterion B will be described.

In the collision type airflow crusher, the crushing plate having a higher Vickers hardness has a higher crushing ability, and the higher the thermal conductivity thereof is, the heat generated by the crushing can be quickly removed so that the crushing plate can be used. It is possible to prevent the crushed powder and the like from being fused and improve the crushing ability. That is, the Vickers hardness and the thermal conductivity of the crushing collision plate were focused on as factors for improving the crushing ability of the collision type airflow crusher.

Therefore, in order to obtain the normal crushing diameter of the powder sent to the next step by satisfying the preset crushing diameter in the classifier 8, the crushing collision from the outlet of the classifier 8 to the next step 10 is performed. Powder was taken out for each material of the plate. Table 2 shows the normal pulverized diameters obtained for each material of mullite / alumina (92%) / alumina (96%) / tank stencarbite / silicon carbide by this work together with Vickers hardness and thermal conductivity.

[0033]

[Table 2]

From Table 2, the above materials have a hardness satisfying Vickers hardness> 2,000 and a thermal conductivity> 0.1.
As shown in Fig. 5, silicon carbide satisfying the thermal conductivity in which the cooling effect easily propagates to the crushing collision plate is compared with alumina (92%) which is a conventional material, in the powder which is transported to the next step after the crushing step. It can be seen that the crushed diameter is usually a material that can be reduced from 6.43 μm to 6.23 μm.

As is clear from the above description, the crushing collision plate of the present invention satisfying the above criteria B can reduce the normal crushing diameter of the powder transported to the next step after the crushing step. I understand.

As shown in FIG. 2, the cooling device according to the second embodiment of the present invention has a structure in which it is attached to the upper part of the hopper. However, the structure is not necessarily limited to this, and the crushing collision plate is cooled. Therefore, the cooling device may be attached to the back surface thereof, and in short, any structure may be used as long as it cools the powder to be crushed and / or the crushing collision plate.

[0037]

As is clear from the above description, the present invention according to claim 1 has the Vickers hardness (kg / mm ² ) × 0.8 +
By using a crushing collision plate made of a material having an elastic modulus (kg / mm ² ) × 0.02> 1,800, there is an advantage that the material accumulation in the hopper can be further reduced. As a result, it has the advantage that the production efficiency can be increased.

According to the present invention of claim 2, Vickers hardness>
2,000 kg / mm ² and thermal conductivity> 0.15 cal / cm
-By using a crushing collision plate made of a material of sec ° C, the powder can be crushed into smaller pieces, which has the advantage of increasing production efficiency.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a collision-type airflow crusher for crushing toner powder to be crushed.

FIG. 2 is a schematic configuration diagram of a collision-type airflow pulverizer with a cooling function for pulverizing toner powder to be crushed.

[Explanation of symbols]

 1 High-pressure gas injection port 2 Acceleration pipe 3 Hopper 4 Acceleration pipe ejection port 5 Grinding chamber 6 Grinding collision plate 7 Discharge port 8 Classifier 9 Cooling device

Claims (2)

[Claims] 1. The material is Vickers hardness (kg / mm ² ) × 0.
8+ elastic modulus (kg / mm ² ) × 0.02> 1,800, which is a crushing collision plate of a collision type airflow crusher. 2. The material is Vickers hardness> 2,000 k
A crushing collision plate of a collision-type airflow crusher having a cooling device, characterized in that g / mm ² and thermal conductivity> 0.15 cal / cm · sec · ° C.