JPS6366584B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pulverizer.

As shown in FIGS. 1 and 2, a conventional pulverizing device supports a cylindrical rotor 2 having a large number of convex portions 1 along the generatrix of the outer surface on a rotating shaft 3, and A stator 6 is fitted with a stator 6 having a gap 4 between them and a large number of protrusions 5 along the generatrix of the inner surface. is supplied, and the particles of the object to be crushed are crushed by the high-speed rotation of the rotor 2.

In the process of crushing the material to be crushed, the material to be crushed is supplied from the supply port 8 provided in the bottom plate of the lower casing 7 which is connected to the lower end of the stator 6 by operating a suction blower (not shown) connected to the product discharge port 12. The particles are sucked into the machine along with the air, and are moved along the inverted conical inner surface of the lower casing 7 by the airflow generated by the stirring blades 9 fixed to the lower surface of the rotor bottom plate, which rotates at high speed together with the rotor 2. The powder is raised at the same time and sent into the crushing chamber formed between the rotor 2 and the stator 6, and is given velocity energy by the rotational force of the rotor 2 rotating at high speed to cause it to collide with the stator 6. It is pulverized and crushed by impact by the convex part 1 of the rotor 2, and further crushed between the convex part 1 of the rotor 2 and the convex part 5 of the stator 6 to be further finely pulverized. The upper casing 1 is carried upward on the upward spiral airflow generated by the rotation and is connected to the upper end of the stator 6.
centrifugal blades 11 fixed to the upper surface of the rotor upper plate, which rotate the rotor 2 at high speed together with the rotor 2;
The product rotates along the inner peripheral surface of the upper casing 10, is discharged from the product discharge port 12 provided in the tangential direction of the upper casing 10, and is introduced into a bag filter (not shown), where the crushed product and air are separated. The air is separated and exhausted via an absorption blower, and the crushed product is sent from a bag filter to a hopper for storage.

By the way, in the above-mentioned pulverizer, the gap 4 between the rotor 2 and the stator 6 is generally 2 to 5 mm or more, which is wide. weak.

(b) The probability of the rotor 2 hitting the particles of the object to be crushed is small.

C. The impact force exerted by the rotor 2 on the particles of the object to be crushed is small.

There were other drawbacks.

In addition, in the crushing chamber formed by the rotor 2 and the stator 6, air flows through the recess 1a of the rotor 2,
The particles to be crushed pass through the gap 4 and the recess 5a of the stator 6, and pass through the crushing chamber riding on this air, that is, the upward spiral airflow, but since the rotor 2 is rotating at high speed, the rotor Almost no particles of the material to be crushed pass through the concave portion 1a of No. 2. Therefore, the particles to be crushed pass through two places: the gap 4 and the recess 5a of the stator 6. However, the convex portion 5 and the concave portion 5 of the stator 6
Since the cross-sectional shape of a is nearly rectangular, air flows from below to above in the recess 5a of the stator 6 while forming a vortex at a high rotational speed as shown in FIG.
Among the particles of the object to be crushed that are caught up in this vortex, some collide with the wall surface of the recess 5a, are discharged from the recess 5a into the gap 4, are subjected to a strong impact action by the projection 1 of the rotor 2, and are fixed. Grinding progresses due to the grinding action between the child 6 and the convex portion 5. However, there is a drawback in that some of the particles to be crushed are not crushed as described above, but remain caught up in the vortex and exit from the crushing chamber through the upper end of the recess 5a.

Therefore, the average particle size of the product crushed by such a fine grinding device differs slightly depending on the particles of the material to be crushed, but for example, it can only be 60 μm for polished rice and 4 μm for toner, and it is difficult to say that it is sufficiently finely pulverized. However, it was not possible to obtain a finely pulverized product on the order of microns or more than 10 microns.

In addition, the above-mentioned pulverizer is B. Rotor 2 rotates at high speed.

(b) To reduce the particle size of the crushed product, limit the amount of air passing through the crushing chamber.

For these reasons, the air discharge temperature rises, and the temperature of the stator 6 locally rises. As a result, depending on the type of the particles to be ground, it may not be possible to grind them, or there may be cases where grinding is possible but the pulverized product will undergo thermal changes, which is undesirable. For example, toners or synthetic resins have low softening points and cannot be crushed, and mildly heat-sensitive substances such as coffee powder, glucose, and certain pharmaceuticals undergo thermal changes.

In order to eliminate these drawbacks, conventionally, in order to cool the air introduced into the pulverizer together with the particles to be pulverized, a pulverizer was installed on the bottom plate of the lower casing 7 connected to the lower end of the stator 6, as shown in FIG. There is a supply port 14 for the particles to be crushed in the middle of the cooling air introduction pipe 13.
An air cooler 15 is connected to the tip of the introduction pipe 13, and the inlet of the cooling coil 16 of the air cooler 15 and the outlet of the refrigerator 17 are connected with a pipe 18.
The outlet of the cooling coil 16 and the inlet of the refrigerant tank 19 are connected by a pipe 20, and the outlet of the refrigerant tank 19 and the inlet of the refrigerator 17 are connected by a pipe 22 having a pump 21 in the middle. 23 in the figure is rotor 2
An electric motor that rotates at high speed runs on a belt 24 to rotate the rotating shaft 3. 25 is a bag filter, and its inlet is connected to the tip of a discharge pipe 27 which is connected to the pulverized product discharge port 12 of the pulverizer. An exhaust pipe 29 having a suction blower 28 in the middle is connected to the outlet of the bag filter 25.

The air introduced into the pulverizer together with the particles to be pulverized passes through the air cooler 15 and is cooled in advance to a required temperature by the cooling coil 16.

However, with such cooling of the introduced air, although the exhaust temperature can be suppressed to a target temperature, it is not possible to suppress the local temperature rise of the stator 6.

In addition, in the conventional pulverizing device, if particles of the object to be pulverized are mixed in, the particles may not be pulverized into fine particles and may be discharged as coarse particles, or the rotor 2 or stator 6 may be significantly worn due to collisions of the coarse particles. Therefore, it is desirable that the particles of the material to be crushed be finely crushed to a certain particle size within a certain range before being supplied, which requires a great deal of effort.

The present invention has been made in view of the above circumstances, and it does not require pre-treatment, and even if the particle size of the particles to be crushed is non-uniform, the supplied particles to be crushed can be reliably and sufficiently processed. It is possible to improve the pulverizing effect by performing a pulverizing action on the pulverizer and obtain a pulverized product with a narrow particle size range of 10-odd microns on the micron order.In addition, it goes without saying that the exhaust temperature of the pulverizer can be suppressed. It is an object of the present invention to provide a pulverizing device capable of suppressing local temperature rise of a stator and capable of pulverizing even particles having a low softening point or mildly heat-sensitive particles without any trouble. It is something.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pulverizing apparatus according to the present invention will be described below with reference to the drawings. In FIG. 5, 30 is a first crushing section, and 31 is a second crushing section. First crushing section 30
As shown in FIG. 6, a large number of crushers 34 are fixed radially along the generatrix of the outer surface of two upper and lower support members 33, 33 fixed to a boss 32 supported at the lower part of the rotating shaft 3'. A first rotor 37 is formed by fixing upper blades 35 and auxiliary blades 36 to upper and lower support members 33 and 33, respectively, and is fitted with a constant gap 38 between the first rotor 37 and the inner side. The first stator 40 has a rectangular convex portion 39 on its surface. The second crushing part 31 is supported on the upper part of the rotating shaft 3', and has a large number of rectangular convex parts 41 along the generatrix of the outer surface as shown in FIG. It consists of a second stator 46 fitted with a second rotor 44 provided with blades 43 with a gap 45 of 1 mm or less therebetween. The inner surface of the second stator 46 has a substantially triangular concave portion 47 and a convex portion 4, as shown in FIG.
8 is made into a continuous tooth shape, and the recess 4 of the tooth shape
One side 47a of the recess 47 is oriented toward the center of the second rotor 44 and has a length of about 1 to 5 mm, and the other side 47b of the recess 47 is oriented toward the tangential direction of the second rotor 44, and has a length of about 1 to 5 mm. The angle α with the other side is 45 to 60 degrees. The tip of the convex portion 48 has a second
An arcuate surface 48a centered on the axis of the stator 46 is formed, and the width of the arcuate surface 48a is approximately 1 mm. Recess 47 on the inner peripheral surface of second stator 46
At the upper end, as shown in FIGS. 9a and 9b, a classification ring 49 that closes the upper opening surface of the recess 47 is provided either integrally or detachably. This classification ring 49
Since the upper end opening surface of all the recesses 47 in the circumferential direction of the inner circumferential surface of the second stator 46 may be closed, the difference δ between the radial width and the length of the protrusion 48 is It may be zero. Further, the classification ring 49 may be provided in the middle of the recess 47 on the inner circumferential surface of the second stator 46 as shown in FIGS. It is also a good idea to set it as Further, the classification ring 46 may be divided and arranged in a plurality of stages at different stages in the circumferential direction. A cooling jacket 50 is provided on the outer periphery of the second stator 46 as shown in FIG. The tip of the introduction pipe 13' provided on the bottom plate of the casing 7' is connected to the outlet of the cooling coil 16' in the air cooling 15' through a pipe 51, and a cooling jacket 50 is connected to the outlet of the cooling coil 16' in the air cooling 15'.
The outlet at the upper end and the inlet of the refrigerant tank 19' are connected by a pipe 52, and the outlet of the refrigerant tank 19' and the inlet of the refrigerator 17' are connected by a pipe 22' having a pump 21' in the middle. ing. The outlet of the refrigerator 17' and the inlet of the cooling coil 16 of the air cooler 15 are connected by a pipe 18'.

The cooling jacket 50 is connected to the first stator 40
It may be provided by extending downward to the outer periphery.

In FIG. 5, 10' is an upper casing, and 12' is a pulverized product outlet. In FIG. 11, reference numeral 23' is an electric motor that runs on a belt 24' and rotates a rotating shaft 3'. Reference numeral 25' denotes a bag filter connected to the tip of a discharge pipe 27' connected to the pulverized product discharge port 12'. At the outlet of this bag filter 25', there is an exhaust pipe 29' equipped with a suction blower 28' in the middle. connected. 53 is the supply port 1 for the particles to be crushed.
4' is the feeder.

Next, the pulverizing action of the particles to be pulverized by the pulverizer of the present invention constructed as described above will be explained. driving the electric motor 23' shown in FIG.
Running on belt 24', rotating shaft 3' at high speed,
In addition, while operating the suction blower 28', the refrigerator 1
A low-temperature refrigerant is sent from 7' to the cooling coil 16' of the air cooler 15', and the air introduced into the air cooler 15' is cooled to a low temperature of 0 to 5°C, which is then passed through the introduction pipe 13' to the lower part. At the same time, the particles to be crushed are introduced into the casing 7' by suction, and the particles to be crushed are fed from the feeder 53 to the supply port 14' in the middle of the introduction pipe 13'.
3', and introduced into the lower casing 7' with low temperature air. The particles to be crushed introduced into the lower casing 7' are moved to the lower casing 7' by airflow generated by the auxiliary blades 36 of the first rotor 37, which rotates at high speed together with the rotating shaft 3' shown in FIG. It rises along the inverted conical inner surface of the casing 7' and enters the first grinding chamber formed between the first rotor 37 and the first stator 40, where the large particles are separated by the first rotor 37 and the first stator 40. The first stator 40 is crushed into pieces. Then, the particles finely pulverized to a particle size within a certain range exit the first pulverizing chamber and ride the airflow generated by the rotation of the upper surface blade 35 and the auxiliary blade 43 of the second rotor 44, and pass through the second rotor 44 and the second The particles are guided to a second grinding chamber formed between the stator 46, where all the particles are subjected to a fine grinding action, and are reduced to micron order or 10 micron order.
A finely pulverized product with a narrow particle size width of several microns is sent into the upper casing 10', and is rolled along the inner circumferential surface of the upper casing 10' by the second rotor 44 and the upper blade 42 that rotates at high speed together. and rotate,
The product is discharged together with air from a product discharge port 12' provided in the tangential direction of the upper casing 10', and introduced into the bag filter 25' through a discharge pipe 27' shown in FIG. 11 connected to the product discharge port 12'. Then, the crushed product and air are separated,
Air is exhausted from an exhaust pipe 29' via a suction blower 28', and the pulverized product is sent from a bag filter 25' to a hopper (not shown) and stored therein.

Next, details of the pulverizing action of the particles to be pulverized in the second pulverizing chamber will be explained.
The related structure of the stator 46 and the classification ring 49 will be explained.

Generally speaking, when considering the air surrounding a rotating body, the air attached to the surface rotates at the same speed as the circumferential speed of the rotating body, whereas the speed of the air at a position away from the surface is the distance The larger the value, the greater the delay from the circumferential speed of the rotating body, and the smaller the speed. However, considering the concave portion 47 of the second stator 46, a vortex is induced in this portion as shown in FIG. The rotational speed of the vortex is proportional to the circumferential velocity υ of the air along the opening surface of the recess 47. Therefore, the second
The larger the dimension h of the gap 45 between the rotor 44 and the second stator 46, the faster the circumferential speed υ of the second rotor 44 becomes.
The circumferential speed of υ lags behind ₀ , and the rotational speed of the vortex becomes smaller. Conversely, the smaller the dimension h of the gap 45, the higher the rotational speed of the vortex. The particles of the material to be crushed that are caught up in the vortex collide with the wall surface more intensely as the rotation speed of the vortex increases, and the particles with smaller diameters also collide with the wall surface as the rotation speed of the vortex increases. The particles of the material to be ground are well ground.

In addition, the probability of impact by the second rotor 44 on particles to be crushed that have come out from the vortex in the recess 47 to the gap 45 is determined by the dimension h of the gap 45, the particle diameter d of the particles to be crushed, and the convexity of the second rotor 44. If the number of portions 41 is n, then P∝d/h×n, and when the dimension h of the gap 45 is small and the number n of the convex portions 41 of the second rotor 44 is large, the above-mentioned impact probability P increases, and The impact pulverization of the particles of the object to be pulverized by the two rotors 44 is performed efficiently.

Further, a gap 45 is formed from the recess 47 of the second stator 46.
The particles of the material to be crushed that come out are accelerated by the air flow flowing through the gap 45. In this case, the larger the dimension h of the gap 45, the longer it takes for the particles to be hit by the second rotor 44, so the relative speed between the particles and the second rotor 44 during impact becomes smaller, and the Although the impact force on the particles by the second rotor 44 is reduced, since the dimension of the gap 45 is extremely small, 1 mm or less, the time until the particles are impacted by the second rotor 44 is shortened, so that the impact force on the particles during impact is reduced. The relative speed with the second rotor 44 increases, and the force with which particles are impacted by the second rotor 44 increases. Therefore, the particles to be ground are reliably struck.

Now, since the shape of the recess 47 of the second stator 46 is approximately triangular as described above, the air flow in this recess 47 is as shown in FIG. 12: a, a', a''...
and vortices b, b', b''. Vortices b, b',
The particles of the object to be crushed that have been caught up in the recess 5a (see Fig. 3) collide with the wall surface and are crushed by the vortex. 47a along the tip B of the convex portion 48
The material advances to the gap 45, where it is struck by the convex portion 41 of the second rotor 44, and is pulverized. The same action is then applied to the concave portion 47 of the second stator 46 and the convex portion 41 of the second rotor 44, and the crushing progresses one after another. On the other hand, the conventional rectangular recess 5a
Air flow a, which almost never occurs in the case of
The particles to be crushed that ride on a', a''...
Proceed to the tip A of the convex portion 48 along the other side 47b,
It is guided into the gap 45 and is struck by the convex portion 41 of the second rotor 44 at this portion, thereby performing pulverization. At the same time, the particles that have been subjected to the impact crushing action are further moved into the recess 4.
It collides with the other side 47b of 7 and is crushed.
The same effect occurs in the recess 4 of the second stator 46 next.
7 and the crushing progresses one after another, and as a result, compared to the case of the conventional rectangular recess 5a, the impact by the second rotor 44 is made not only at point B but also at point A, so the probability of crushing increases. , the particles of the material to be pulverized are finely and efficiently pulverized.

However, some or all of the recesses 47 in the circumferential direction of the inner peripheral surface of the second stator 46 are partially closed in the vertical direction as shown in FIGS. 9a, b or 10a, b. Since the classification ring 49 is provided, particles of the object to be crushed do not travel inside the recess 5 on a high rotational speed vortex (see Fig. 3) and exit out of the second crushing chamber all at once, unlike in the conventional case. Due to the classification action of the classification ring 49, which will be described later, the residence time of the particles to be crushed in the second crushing chamber becomes longer, and at the same time, the concentration of the particles to be crushed in the second crushing chamber increases. The longer the residence time, the higher the probability of being subjected to the pulverizing action, and the more fine the pulverized product can be obtained. Furthermore, when the concentration of the particles of the object to be crushed increases, the probability of collision between the particles of the object to be crushed increases, and the crushing action is promoted. Due to these two effects, the particles of the object to be ground are reliably pulverized.
The particles that have been finely pulverized in this way are carried by the airflow and are about to exit into the gap 45 directly under the classification ring 49, because the centrifugal force caused by the rotation of the second rotor 44 is still acting here, so the particles have a certain size. The above particles are pushed back into the recess 47 of the second stator 46 again. The pushed back particles are subjected to the crushing action again and are passed through the classification ring 4 until they become smaller than a certain size.
I can't get past the 9 part. Therefore, the particles of the object to be pulverized are sufficiently pulverized.

In this way, the finely pulverized particles that have passed through the second pulverizing chamber formed between the second rotor 44 and the second stator 46 are separated by the above-mentioned gap 45 of 1 mm or less and the side 47a.
The second rotor 4 faces toward the center and the other side 47b rotates.
A large number of substantially triangular recesses 47 on the inner surface of the second stator 46 are oriented in the tangential direction of the second rotor 44 so as to face the second stator 46, and the angle α of both sides 47a and 47b is 45 to 60 degrees. , due to the synergistic effect of the action with the classification ring 49 provided to partially close some or all of the recesses 47 in the circumferential direction of the inner peripheral surface of the second stator 46 in the vertical direction, It becomes a finely pulverized product of several microns.

As the particles of the object to be crushed are pulverized by the second pulverizing section, the temperatures of the introduced air and the particles of the object to be crushed increase as they move from the bottom to the top within the second pulverization chamber. In principle, the temperature rises uniformly from the bottom to the top, but the temperature rises uniformly from the bottom to the top.
It is unavoidable that the concentration of the particles to be crushed becomes locally high in the concave portion 47 of the second stator 46, and therefore a local temperature increase of the particles to be crushed and the introduced air occurs.

In order to suppress these temperature increases, the pulverizer of the present invention not only cools the air introduced into the second pulverizing chamber together with the particles to be pulverized by the cooling coil 16' through the air cooler 15'; The refrigerant passing through the cooling jacket 50
through the gap 45 and the recess 4 of the second stator 46
7, the air and particles of the material to be crushed are transferred to the second stator 46.
Heat is exchanged with the refrigerant in the cooling jacket 50 through the cooling jacket 50. Since the gap 45 is extremely small, 1 mm or less, this heat exchange has a large heat transmission coefficient, is extremely efficient, and has a remarkable cooling effect. Therefore, compared to the conventional cooling method that only introduces cooling air, it is possible not only to suppress the temperature rise of the air and the particles to be crushed, but also to prevent the local temperature rise of the second stator 46. It can be suppressed.

In addition, when the cooling jacket 50 is provided extending downward to the outer circumference of the first stator 40, the first stator 4
0 temperature rise can also be suppressed.

In addition to the above-mentioned pulverizer according to the present invention, there is one shown in FIG. 13. In this pulverizing device, a classifier 54 is provided in the middle of a discharge pipe 27' that connects a product discharge port 12' and a bag filter 25', and a coarse powder discharge port 55 of the classifier 54 and a lower casing 7' are connected to each other. The introduction pipe 13' is connected to a material supply port 14' provided in the middle through a pipe 56, and the fine powder discharge port 57 of the classifier 54 is connected to a bag filter 25' through a discharge pipe 27'. . The rest of the configuration is the same as that in FIG. 11, so a description thereof will be omitted.

According to this pulverizing device, the pulverized product with a narrow particle size range, which is pulverized to micron order to tens of microns in the second pulverizing section 31, is delivered to the product outlet 1 along with air.
2' and passes through the pipe 27' to the classifier 54.
Once inside, it is classified into fine powder on the micron order and coarse powder on the order of 10 microns. Then, one fine powder is introduced into the bag filter 25' through the pipe 27',
Here, the fine powder and air are separated, and the air is exhausted from the exhaust pipe 29' via the suction blower 28', and the fine powder is sent from the bag filter 25' to a hopper (not shown) and stored therein. On the other hand, the coarse powder is fed from the discharge port 55 through the pipe 56 to the feed port 14' for the material to be ground, and is supplied to the introduction pipe 13', and from the feeder 53 to the feed port 14' for the material to be ground, and is fed to the feed port 13'. They are introduced into the lower casing 7' along with the new particles of the material to be crushed that have been supplied to the casing 7' on the cooling air, and are again subjected to the crushing action in the first crushing section 30 and the second crushing section 31. Therefore, the pulverized product obtained by this pulverizer is a fine powder with an extremely narrow particle size range on the micron order.

As can be seen from the above description, the pulverizer of the present invention crushes coarse particles in the particles of the object to be crushed in advance in the first pulverizing section to form fine particles with a particle size within a certain range, and then Since the powder is finely pulverized by two pulverizers, wear of the second rotor and second stator is significantly reduced, and the product is highly durable. Moreover, unlike the conventional method, there is no need for pre-treatment of finely pulverizing the particles of the object to be pulverized to a certain particle size within a certain range, thereby eliminating the great amount of labor required for this.

Further, the pulverizer of the present invention has a second pulverizer in the second pulverizer.
The inner surface of the stator has a special shape, and the gap with the second rotor is extremely narrow, less than 1 mm.
It is possible to reliably, sufficiently, and efficiently pulverize the particles of the object to be pulverized, from micron order to fine pulverization.
Finely pulverized products with a narrow particle size range of 10-odd microns can be easily obtained in a short time.

In particular, if a finely pulverized product is classified with a classifier and the coarse powder on the order of 10-odd microns is returned and pulverized again, a pulverized product with an extremely narrow particle size range on the order of microns can be obtained.

Furthermore, the pulverizing device of the present invention not only cools the air introduced into the second pulverizing chamber together with the particles to be pulverized, thereby suppressing the exhaust temperature, but also allows for the localization of the stator, which was previously impossible. Since temperature rise can be suppressed, even particles with a low softening point can be crushed smoothly without becoming impossible to crush, and even particles of mildly heat-sensitive substances can be crushed without undergoing thermal changes. . Furthermore, since the introduced air is cooled and the stator is cooled by one cooling device, the cooling efficiency is extremely high and the operating cost is low and economical.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view showing a conventional pulverizer, Figure 2
The figure is a partially enlarged sectional view taken along the line - in Figure 1, Figure 3 is a partial perspective view showing the air flow in the recesses on the inner surface of the stator of the pulverizer in Figure 1, and Figure 4. 5 is a system diagram showing another conventional pulverizing device, FIG. 5 is a vertical sectional view showing the main parts of the pulverizing device of the present invention, and FIG.
5 is an enlarged sectional view taken along the line - in FIG. 5, FIG. 7 is an enlarged sectional view taken along the line - in FIG. 5, and FIG. A partial horizontal sectional view showing a combination of a rotor and a second stator; FIGS. 9a and 9b are partial perspective views showing a classification ring provided at the upper end of a recess in the inner circumferential surface of the second stator; FIGS. 10a and 10b are a partial perspective view and a partial vertical cross-sectional view showing a classification ring provided in the middle of the recess on the inner circumferential surface of the second stator, and FIG. 11 is an overall view of the pulverizing device of the present invention. FIG. 12 is an enlarged view of FIG. 8 for explaining the pulverizing action of particles to be crushed due to the relationship between the concave portions on the inner surface of the second stator and the convex portions on the outer surface of the second rotor; FIG. 13 is a system diagram showing another pulverizer of the present invention. 3'...rotating shaft, 7'...lower casing, 10'...
Upper casing, 12'...Product discharge port, 13'...Introduction pipe, 14'...Crushed material supply port, 15'...Air cooler, 16'...Cooling coil, 17'...Freezer, 18'
... Piping, 25'... Bag filter, 27'... Discharge pipe, 30... First crushing section, 31... Second crushing section, 34
...Crusher, 37...First rotor, 38...Gap, 39
...Protrusion, 40...First stator, 41...Protrusion, 44...
Second rotor, 45... Gap, 46... Second stator, 4
7... Substantially triangular recess, 47a... One side of the recess, 47
b...Other side of the concave portion, 48...Substantially triangular convex portion, 49...
Classifying ring, 50... Cooling jacket, 51... Piping, 52... Piping, 54... Classifier, 55... Coarse powder outlet, 56... Piping.

Claims (1)

[Claims] 1. A first stator is fitted with a constant gap between the rotor and the first rotor, which is supported at the lower part of the rotating shaft and has crushers radially along the generatrix of the outer surface. A second stator is fitted with a gap of 1 mm or less between the first crushing part and a second rotor that is supported on the upper part of the rotating shaft and has a large number of convex parts along the generatrix of the outer surface. a second crushing section, an introduction pipe for introducing particles of the crushed material and air provided in a lower casing connected to the lower end of the first stator, and a crushed product provided in an upper casing connected to the lower end of the second stator. The inner surface of the second stator of the second crushing section has a tooth shape in which approximately triangular concave portions and convex portions are continuous, and one side of the concave portion of the tooth shape is directed toward the center of the second rotor. The other side of the recess is provided in the tangential direction of the second rotor, the included angle between one side of the recess and the other side is 45 to 60 degrees, and a part of the inner circumferential surface of the second stator is provided in the circumferential direction. Alternatively, at least one classification ring is provided at the upper end or in the middle of all the recesses to partially close the recesses in the vertical direction, and at least a cooling jacket is provided on the outer periphery of the second stator, and a cooling jacket is provided on the outer periphery of at least the second stator. The inlet and the outlet of the cooling coil of the air cooler provided at the tip of the introduction pipe of the lower casing are connected via piping,
A pulverizer in which the outlet of a cooling jacket and the inlet of a refrigerator are connected through piping, and the outlet of the refrigerator and the inlet of a cooling coil of an air cooler are connected through piping. 2. A first crushing part in which a first stator is fitted with a certain gap between the first rotor and the first rotor, which is supported at the lower part of the rotating shaft and has crushers radially along the generatrix of the outer surface; a second crushing section in which a second stator is fitted with a gap of 1 mm or less between the second rotor, which is supported on the upper part of the rotating shaft and has a large number of convex portions along the generatrix of the outer surface; , an inlet pipe for introducing particles of the pulverized material and air provided in a lower casing connected to the lower end of the first stator, and a pulverized product outlet provided in the upper casing connected to the lower end of the second stator. , the inner surface of the second stator of the second crushing section has a tooth shape in which substantially triangular concave portions and convex portions are continuous, one side of the concave portion of the tooth shape is directed toward the center of the second rotor, and the other side of the concave portion is oriented toward the center of the second rotor. is provided in the tangential direction of the second rotor, the included angle between one side of the recess and the other side is 45 to 60 degrees, and the upper end of the recess in part or all of the inner peripheral surface of the second stator in the circumferential direction Alternatively, at least one stage of classification ring is provided in the middle to partially close the recess in the vertical direction, and a cooling jacket is provided at least on the outer periphery of the second stator, and the inlet of the cooling jacket and the lower casing are connected to each other. The outlet of the cooling coil of the air cooler installed at the tip of the introduction pipe is connected via piping,
The outlet of the cooling jacket and the inlet of the refrigerator are connected through piping, the outlet of the refrigerator and the inlet of the cooling coil of the air cooler are connected through piping, and the crushed product outlet of the upper casing and the bag are connected. A classifier is provided in the middle of the discharge pipe connected to the filter, and the coarse powder discharge port of the classifier and the material supply port to be crushed provided in the middle of the introduction pipe of the lower casing are connected by piping. Fine grinding equipment.