JPH11114439A - Crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crusher provided with a separator possible to cope with small media. SOLUTION: A stirring member 18 comprising a plurality of stirring blades 20 is installed in a crushing chamber 3 in rotatable manner. On the other hand, a separator 11 is installed adjacently to the discharge outlet 5 of the crushing chamber 3. The separator 11 is produced by overlaying a plurality of ring-like plates 12 while keeping gaps equal to the thickness of distance pieces 13 between neighboring ring-like plates 12, 12 by inserting the distance pieces 12 between neighboring ring like plates 12, 12 and in the separator 11, parts of stirring blades 20 of the stirring member 18 are positioned as to be close to the inner circumferential face of the separator. When the stirring member 18 is rotated, an object to be treated is stirred together with media, crushed, separated from the media due to the gaps 14 of the separator 11 and discharged outside of the crushing chamber 3 through the discharge outlet 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulverizer, and more particularly to a media stirring type pulverizer effectively used for pulverization in a process of manufacturing ink, paint, ceramics and the like.

[0002]

2. Description of the Related Art A media stirring type pulverizer can be used in a dry type or a wet type. In the case of using a dry process, when a granular or powdery processed material is supplied from a supply port into a grinding chamber, the processed material is agitated and pulverized together with a medium in the grinding chamber. The medium is separated from the medium by the separator, and the medium is discharged from the discharge port to the outside of the pulverization chamber with the medium remaining in the pulverization chamber.

[0003] In the case of using a wet type, when a suspension containing a granular or powdery processed material is supplied from a supply port into a grinding chamber,
The processed material is stirred with the media in the grinding chamber and ground, and the ground product is separated from the media by a separator near the discharge port, and discharged from the discharge port to the outside of the grinding chamber while leaving the medium in the grinding chamber. A processed product having a particle size of

[0004] The media stirring type pulverizer is also used for pulverizing very fine solids, and the target particle diameter is often on the order of microns or submicrons. In such fine pulverization, the smaller the medium used, the better the pulverization efficiency. Recently, media having a diameter of 1 mm or less are often used.

[0005] An example of a media stirring type pulverizer used in a dry system is described in Japanese Utility Model Publication No. 6-21559 (conventional example 1). In this crusher, the processed material is supplied into the crushing tank from a supply port provided on the drive side of the rotating shaft, and is discharged out of the crushing tank from a discharge tank provided on the opposite side. A screen is provided near the discharge tank, and the processed material and the medium are separated by the screen.

[0006] As the target particle diameter of the processed material becomes smaller, the target particle diameter cannot be achieved with a large medium, and thus it is necessary to use a small medium. Further, when a small medium is used, it is necessary to increase the rotation speed of the stirring blade. This is because, as the mass of the medium decreases, the crushing energy decreases, and to compensate for this, it is necessary to increase the stirring.

However, in the crusher having the above-described structure, if the size of the medium is reduced and the rotation speed of the stirring blade is increased at the same time, the processed material is blown out from the supply port, and the supply of the processed material becomes difficult. The phenomenon of blockage occurred. This is because the centrifugal force is increased due to the faster rotation of the stirring blade, and the medium and the processed material near the supply port are discharged.

A pulverizer that solves the problem of supplying the processed material as described above is described in Japanese Utility Model Publication No. 7-8034 (prior art 2). In this crusher, a discharge port for the processed material is provided on the driving side of the rotating shaft, and a supply port is provided on the opposite side. The supply port is open at the axis of the rotating shaft. Since this portion is not affected by the centrifugal force, the supply of the processed material can be easily performed. At the discharge port side, a predetermined gap is formed between the separator forming plate fixed to the tank side and the disc member fixed to the rotating shaft side, and the gap separates the medium and the processed material. ing.

By the way, when a small medium is used, a separator having a fine opening is naturally required. For example, in the case of forming a slit, it is necessary to set the gap to about １ ／ of the particle diameter of the medium. Therefore, when using media with a particle size of 1 mm,
mm.

[0010] However, such a fine slit is not only difficult to manufacture with the separator of the pulverizer having the above-mentioned structure, but also has a small opening area of the whole separator, which makes it difficult for the processed material to flow. In the case of using a dry process, it is also difficult to apply pressure to and discharge the processed product.

On the other hand, an example of a media stirring type pulverizer used in a wet type is disclosed in JP-A-9-164342 (prior art 3).
It is described in. In this crusher, the processed material is supplied into the crushing chamber from a supply port provided on the driving side of the rotating shaft,
It is discharged out of the crushing chamber from a discharge port provided on the opposite side.
A separator is provided near the discharge port, and the processed material and the medium are separated by the separator.

The separator is formed in a cylindrical shape by stacking a plurality of annular members in the axial direction, and forming a narrow gap between adjacent annular members to communicate the inside and outside.
The processing object flows from the outside of the cylinder toward the inside through the gap.

However, as in the case of dry processing,
If the gap between the separators becomes narrower as the media becomes smaller, the solid particles adhere to the outer peripheral side of the separator, and the flow of the processed material becomes worse.

As described above, the separator and the discharge method have been major issues in both the dry processing and the wet processing.

Conventionally, there are various types of separators. The separator of the crusher of Conventional Example 1 is a disk-shaped separator provided at right angles to the axis of the crushing chamber. Since the disc is provided with a large number of round holes and slits, it is called a perforated plate type. It is difficult to make the size of the disk larger than the sectional area of the grinding chamber.
Also, as the holes and slits become finer, it is inevitable that the entire opening area becomes smaller.

The separator of the pulverizer according to Conventional Example 2 has a gap between a plate fixed inside the pulverizing chamber and a disk fixed to the rotating shaft, and is called a rotary disk type. Have been. Since the gap portion serves as a sliding portion, the processed material easily flows despite the small opening area. However, since it is difficult to provide a plurality of gaps, the opening area cannot be increased.

The separator of the pulverizer of Conventional Example 3 is called a ring separator, and has an advantage that the opening area can be freely increased by increasing the number of rings.
It is also relatively easy to manufacture. However, as mentioned above,
There is a disadvantage that solid matter easily adheres to the outer periphery.

The present invention solves the above-mentioned problems of the prior art, and has a large opening area, is easy to flow a processed material, and is provided with a separator which can be easily manufactured, so that a target particle can be obtained. It is an object of the present invention to provide a pulverizer capable of sufficiently coping with the pulverization of a processed product having a diameter on the order of microns or submicrons, and obtaining a high pulverization efficiency.

[0019]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a cylindrical grinding chamber having a supply port for a processed material at one end and a discharge port at the other end. A cylindrical separator provided near the outlet in the room,
A rotating shaft whose end is located on the inner peripheral side of the separator and a stirring member provided throughout the rotating shaft are provided while being rotatably provided in the pulverizing chamber. Means configured so as to be smaller than the inner diameter of the separator is employed. Further, the separator overlaps a plurality of annular ring-shaped plates and forms a gap corresponding to the thickness of the distance piece between adjacent ring-shaped plates by interposing a distance piece between adjacent ring-shaped plates. In this case, means for communicating between the pulverizing chamber and the discharge port through the gap is employed. Further, a means is employed in which a portion of the stirring member located on the inner peripheral side of the separator is shaped to be close to the entire inner peripheral surface of the separator.

[0020]

According to the present invention, by employing the above-described means, when the processed material is supplied from the supply port into the grinding chamber, the processed material is stirred together with the medium by the rotation of the stirring member in the grinding chamber and is ground. The pulverized processed material is separated from the media by a separator provided near the discharge port of the pulverizing chamber, and discharged out of the pulverizing chamber through the discharge port. Since the separator is formed in a cylindrical shape and the inner diameter of the separator is formed larger than the diameter of the stirring member, the opening area of the separator can be increased, and the flow of the processed material and the media in the grinding chamber can be increased. The amount can be increased. Further, the media can be brought into intense contact with each other on the inner peripheral side of the separator.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the ring separator can easily and freely have an open area. Therefore, the inventors repeatedly studied on the conventional problem of the ring separator, that is, the phenomenon that solid matter adheres to the outer periphery of the ring.

In general, the solid particles in the treated product are very small compared to the gap between the separators, so that the single particles do not cause clogging. Therefore, as a cause of the clogging, it is considered that there is a portion where particles easily adhere near the separator, and the adhered particles grow and become large.

As a result of repeated studies paying attention to this point, in the case of the perforated plate type separator of the conventional example 1 and the rotating disk type separator of the conventional example 2, the media come into active contact with the separator and its vicinity. On the other hand, in the case of the separator of the conventional example 3, it was found that the medium hardly came into contact with the outer periphery thereof.

That is, since the ring separator of Conventional Example 3 is provided inside the stirring member, the medium does not approach the outer periphery of the separator due to the centrifugal force of the stirring member, and the solid particles in the treated material are removed from the outer periphery of the separator. And may cause clogging.

As a result of further research based on this discovery, it was found that all the problems could be solved at once by providing the ring separator of Conventional Example 3 outside the stirring member, and the present invention was reached.

That is, by providing the ring separator of Conventional Example 3 outside the stirring member, the processed material flows from the inside to the outside of the ring separator. At this time, since the stirring member is rotating inside the ring separator, the medium comes into heavy contact due to centrifugal force. Therefore, it is possible to prevent the solid particles in the processed material from adhering to the outer periphery of the separator and causing clogging. Further, since the ring separator is provided outside the stirring member, the diameter can be made larger than that of the conventional one, and the opening area can be made very large.

An embodiment of the crusher according to the present invention will be described below. FIG. 1 shows a first example of a pulverizer according to the present invention.
Is shown. The crusher 1 is a dry-type media stirring type crusher, and includes a crushing tank 2 having a crushing chamber 3, a rotating shaft 16 rotatably provided in the crushing tank 2, and a stirring device provided on the rotating shaft 16. It has a member 18 and a separator 11 provided in the crushing chamber 3.

The pulverizing tank 2 has a cylindrical shape with both ends closed. A supply port 4 penetrating the inside and outside of the pulverizing chamber 3 is provided at the center of one end in the axial direction, and the other end in the axial direction. A discharge port 5 penetrating the inside and outside of the crushing chamber 3 is provided in the outer peripheral portion.

A screw feeder 6 is attached to the supply port 4. The screw feeder 6 includes a cylindrical supply pipe 7 attached to a peripheral portion of the supply port 4, and a screw 8 rotatably provided in the supply pipe 7.
And a driving source (not shown) for the screw 8, and a funnel-shaped hopper 9 attached to the supply pipe 7, and the processed material put into the supply pipe 7 from the hopper 9 by the rotation of the screw 8. Is guided into the pulverizing chamber 3 through the supply port 4.

A cylindrical discharge pipe 10 is attached to the discharge port 5, and through this discharge pipe 10, the processed material pulverized to a predetermined particle size in the pulverization chamber 3 is discharged out of the pulverization chamber 3. It has become.

A cylindrical separator 11 is mounted near the discharge port 5 in the crushing chamber 3 so that the axis of the crushing tank 2 is aligned with the axis. The separator 11 overlaps a plurality of annular ring-shaped plates 12 and interposes an annular distance piece 13 at a plurality of locations (four locations in this embodiment) between the adjacent ring-shaped plates 12, 12. Each adjacent ring-shaped plate 1
A gap 14 corresponding to the thickness of the distance piece 13 and communicating between the inside and outside of the separator 11 in the radial direction between the gaps 2 and 12
Is formed.

In this case, the inner diameter of the ring-shaped plate 12 is formed substantially equal to the inner diameter of the crushing tank 2. The plurality of ring-shaped plates 12 are positioned so as to be inscribed inside the four bolts 15, and each bolt 15 is inserted through the center of each distance piece 13.

The portion corresponding to the bolt 15 of each ring-shaped plate 12 is formed in a square cross section, and the portion located between the adjacent bolts 15 is formed in a substantially triangular cross section so that the outer peripheral side becomes thinner. (See FIGS. 3 and 4). By making the ring-shaped plate 12 inclined in this way, the gap 14 located between the ring-shaped plates 12, 12 is formed wider on the outer peripheral side than on the inner peripheral side, and the outflow of the processed material can be made smooth. Things.

The rotating shaft 16 is rotatably provided in the crushing tank 2 with the axes thereof aligned with each other, and has a fluid passage 17 for flowing cooling water at the center thereof.

The agitating member 18 is provided on the outer peripheral surface of the main body 19 at a predetermined interval on another stage on the outer peripheral surface of the main body 19 and the cylindrical main body 19 fitted to the portion of the rotary shaft 16 located in the crushing chamber 3. And a plurality of stirring blades 20. Main body 19
A fluid passage 21 for flowing cooling water is formed between the inner peripheral surface of the rotary shaft 16 and the outer peripheral surface of the rotary shaft 16.
Numeral 1 communicates with the fluid passage 17 of the rotating shaft 16 via a communication hole 22.

Then, the processed material is supplied into the crushing chamber 3 via the screw feeder 6 and the stirring member 18 is rotated integrally with the rotating shaft 16, and the processed material is stirred together with the medium in the crushing chamber 3. Crushed. The processed product pulverized to a predetermined particle size is separated from the medium by the separator 11 and discharged to the outside of the pulverizing chamber 3 through the discharge port 5 and the discharge pipe 10 with the medium remaining in the pulverizing chamber 3. .

In the crusher 1 according to this embodiment having the above-described structure, the separator 11 is a so-called ring separator, and the separator 11 is provided outside the stirring member 18. The opening area can be increased. Therefore, a large amount of air can be flowed into the crushing chamber 3 by centrifugal force when the stirring member 18 rotates, so that the solid particles are prevented from adhering to the separator 11, clogging, adhering to the inner surface of the discharge pipe 10, and the like. Will be able to do that.

Further, since the media can be vigorously brought into contact with each other on the inner peripheral side of the separator 11, the inner and outer peripheral surfaces of the separator 11 can be always kept in a clean state, and the distribution of the processed material and the media can be smoothly performed. Will be able to

The present inventors conducted a pulverization test using the above-mentioned pulverizer 1. As a result, no adhesion of the solid particles to the separator 11 and no clogging occurred, and it was confirmed that the separator 11 was always kept in a clean state. Further, there was a concern that the processed material discharged from the separator 11 might adhere to the inner surface of the discharge pipe 10, but it was confirmed that there was no problem at all.

FIG. 5 shows a second embodiment of the pulverizer according to the present invention. The crusher 31 is a wet media stirring type crusher, and includes a crushing tank 32 having a crushing chamber 33 therein, a rotating shaft 46 rotatably provided in the crushing tank 32, and a rotating shaft 46. Stirring member 48 and a separator 41 provided in the crushing chamber 33.
With

The crushing tank 32 has a cylindrical shape with both ends closed, and has a crushing chamber 3 at one end in the axial direction.
3, a supply port 34 penetrating the inside and outside of the grinding chamber 33 is provided at an outer peripheral portion of the other end in the axial direction, and a discharge port 35 penetrating the inside and outside of the pulverizing chamber 33 is provided. Can be attached.

A cylindrical separator 41 is mounted near the discharge port 35 in the pulverizing chamber 33 so that the axis of the pulverizing tank 32 is aligned with the axis.
The separator 41 has the same configuration as that shown in the first embodiment. The separator 41 has a plurality of annular ring-shaped plates 42 overlapped with each other. Locations (4 locations in this example)
The distance piece 43 is interposed between the adjacent ring-shaped plates 42, 42 with an annular distance piece 43 interposed therebetween.
A gap 44 corresponding to the thickness of the separator and communicating the inside and outside of the separator 41 in the radial direction is formed.

In this case, the inner diameter of the ring-shaped plate 42 is formed substantially equal to the inner diameter of the crushing tank 32. The plurality of ring-shaped plates 42 are positioned so as to be inscribed inside the four bolts 45, and each bolt 45 passes through the center of each distance piece 43.

The portion corresponding to the bolt 45 of each ring-shaped plate 42 is formed in a square cross section, and the portion located between the adjacent bolts 45, 45 is formed in a substantially triangular cross section so that the outer peripheral side becomes thin. (See FIGS. 3 and 4). By providing the ring-shaped plate 42 with such an inclination, the gap 44 located between the ring-shaped plates 42, 42 is formed.
Is formed such that the outer peripheral side is formed wider than the inner peripheral side, and the outflow of the processed material can be made smooth.

The rotating shaft 46 is rotatably provided in the grinding tank 32 with its axis aligned.
A fluid passage 47 for flowing cooling water is formed at the center.

The agitating member 48 is provided at another stage at a predetermined interval on the entire outer peripheral surface of the main body portion 49 at a predetermined interval on a cylindrical main body portion 49 fitted to a portion of the rotary shaft 46 located in the crushing chamber 33. And a plurality of stirring blades 50.

A fluid passage 51 for flowing cooling water is formed between the inner peripheral surface of the main body 49 and the outer peripheral surface of the rotating shaft 46. The fluid passage 51 and the fluid passage 47 of the rotating shaft 46 are formed.
Communicate with each other through the communication hole 52.

Then, the processed material in the form of suspension is supplied from the supply port 34 into the crushing chamber 33 and the stirring member 48 is rotated integrally with the rotating shaft 46. Stir and crush. The processed product crushed to a predetermined particle diameter is separated from the medium by the gap 44 of the separator 41, and leaves the medium outside the crushing chamber 33 through the discharge port 35 and the discharge pipe 40 with the medium remaining in the crushing chamber 33. Is discharged.

In the pulverizer 31 according to this embodiment constructed as described above, similarly to the first embodiment, the separator 41 is a so-called ring separator and the separator 41 is a stirring member 48. , The opening area of the separator 41 can be increased. Therefore, the flow of the suspension in the crushing chamber 33 can be increased, so that the suspension does not stay in the crushing chamber 33, and the solid particles adhere to the separator 41, are clogged, and are discharged. It is possible to prevent the tube 40 from adhering to the inner surface.

Further, since the media can be vigorously brought into contact with each other on the inner peripheral side of the separator 41, the inner and outer peripheral surfaces of the separator 41 can be always kept in a clean state. The flow of the media can be made smooth.

The present inventors conducted a pulverization test using the above-described pulverizer 31. As a result, it was confirmed that the solid particles did not adhere to or clog the separator 41 at all, and the separator 41 was always kept in a clean state. Furthermore, there was a concern that the processed material discharged from the separator 41 would adhere to the inner surface of the discharge pipe 40, but such adhesion did not occur at all.

FIG. 6 shows a third embodiment of the pulverizer according to the present invention. The pulverizer 55 is a wet media stirring type pulverizer, in which a stirring ring 56 whose outer peripheral surface is close to the inner peripheral surface of the separator 41 is provided at the tip of a stirring member 48, Since the configuration has the same configuration as that shown in the second embodiment, the same parts as those shown in the second embodiment are denoted by the same reference numerals and detailed description of the configuration is omitted. It shall be omitted.

The stirring ring 56 has a cylindrical shape with one end closed. Stirring blades 57 are integrally provided at predetermined intervals in the circumferential direction on the outer peripheral surface. Through hole 5 penetrating between the inner and outer peripheral surfaces
8 are provided, and the stirring ring 56 is
The media and the processed material are mutually circulated between the inner and outer peripheral surfaces.

In the crusher 55 according to this embodiment having the above-described configuration, the separator 41 is a so-called ring separator and the separator 41 is agitated similarly to the second embodiment. By providing it outside the member 48, the separator 41
Can have a large opening area. Accordingly, the amount of the flow of the suspension in the crushing chamber 33 can be increased, so that the suspension does not stay in the crushing chamber 33, and the solid particles adhere to the separator 41 and are clogged. Therefore, it is possible to prevent the discharge pipe 40 from being attached to the inner surface.

Further, since the media can be brought into intense contact with each other on the inner peripheral side of the separator 41, the inner and outer peripheral surfaces of the separator 41 can be always kept in a clean state. The flow of things can be smoothed.

Further, in this embodiment, a stirring ring 56 is provided at the tip of the stirring member 48 to
Since the inner peripheral surface of the separator 1 is made to approach the inner peripheral surface, the centrifugal force acting on the medium can be increased at the surface portion of the separator 41. Therefore, the media will be stirred in a state where they are in close contact with each other,
Even if the media is small, a large grinding energy can be obtained. Moreover, since the stirring ring 56 is provided with a plurality of through-holes 58 penetrating between the inner and outer peripheral surfaces of the peripheral wall, the media and the processed material can be circulated through the through-holes 58. Solid particles can be prevented from adhering to the inner and outer peripheral surfaces, and the stirring ring 56 can always be kept clean.

The present inventors conducted a pulverization test using the above-described pulverizer 55. As a result, it was confirmed that the solid particles did not adhere to or clog the separator 41 at all, and the separator 41 was always kept in a clean state. Further, the processed material discharged from the separator 41 did not adhere to the inner surface of the discharge pipe 40 at all. Furthermore, no solid particles adhered to the stirring ring 56.

[0058]

According to the present invention, the cylindrical separator is located outside the stirring member and the diameter of the stirring member is smaller than the inner diameter of the separator. The opening area can be increased. Therefore, the amount of the flow of the air or the suspension in the crushing chamber can be increased, so that the solid particles can be prevented from adhering to the inner and outer peripheral surfaces of the separator, the inner surface of the discharge port, and the like. Further, since the media can be brought into intense contact with each other on the inner peripheral surface side of the separator, the separator can always be kept in a clean state. By forming the portion of the stirring member located on the inner peripheral side of the separator close to the inner peripheral surface of the separator, the centrifugal force acting on the medium can be increased at the surface of the separator. Therefore, since the media can be agitated in a state where they are in close contact with each other, a high crushing energy can be obtained even when a small media is used, and it is possible to sufficiently cope with the use of a small media. Become.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of a crusher according to the present invention.

FIG. 2 is a partial plan view of the separator of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a schematic sectional view showing a second embodiment of the crusher according to the present invention.

FIG. 6 is a schematic sectional view showing a third embodiment of the pulverizer according to the present invention.

[Explanation of symbols]

 1, 31, 55 ... crusher 2, 32 ... crushing tank 3, 33 ... crushing chamber 4, 34 ... supply port 5, 35 ... discharge port 6 ... screw feeder 7 ... supply pipe 8 ... Screw 9 Hopper 10, 40 Discharge pipe 11, 41 Separator 12, 42 Ring plate 13, 43 Distance piece 14, 44 Gap 15, 45 Bolt 16, 46 Rotating shaft 17, 21, 47, 51 Fluid passage 18, 48 Stirring member 19, 49 Body part 20, 50, 57 Stirring blade 22, 52 Communication hole 56 Stirring ring 58 … Through hole

Claims (3)

[Claims] 1. A cylindrical grinding chamber having a supply port for treated material at one end and a discharge port at the other end, a cylindrical separator provided in the vicinity of the discharge port in the grinding chamber, A rotatable member is provided in the chamber, and a rotating shaft having an end located on the inner peripheral side of the separator, and a stirring member provided throughout the rotating shaft are provided, and the diameter of the stirring member is equal to that of the separator. A crusher characterized by being configured to be smaller than the inner diameter. 2. The separator according to claim 1, wherein a plurality of annular ring-shaped plates are overlapped with each other, and a distance piece is interposed between adjacent ring-shaped plates to correspond to a thickness of the distance piece between adjacent ring-shaped plates. The crusher according to claim 1, wherein a gap is formed, and the crushing chamber and the discharge port communicate with each other through the gap. 3. The pulverizer according to claim 1, wherein a portion of the stirring member located on the inner peripheral side of the separator has a shape close to the entire inner peripheral surface of the separator.