JPH08309224A - Powder accelerator - Google Patents

Abstract

PURPOSE: To provide a powder accelerator dissolving problems which respectively belong to a metal powder accelerator and a ceramic accelerator. CONSTITUTION: This accelerator 100 is consists of a nozzle main body 10 and an acceleration tube 12, and a feed port 14 for object to be accelerated is formed in the acceleration tube 12. A portion reaching from the port 14 to an outlet 17 of an acceleration tube in the acceleration path piping 13 of the acceleration tube 12 is formed with a path forming parts 16, and the path forming parts 16 is inserted into an acceleration tube main body 15 in freely detachably. The nozzle main body 10, the acceleration main body 15 and the path forming parts 16 are made of metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder supply accelerator of a decompression unit for accelerating powder using a jet jet.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open Nos. 4-48942 and 5-1
The powder accelerator disclosed in JP-A-5801 and JP-A-5-15802 is incorporated in, for example, a jet airflow pulverizer used for producing a dry toner used in an electrophotographic development process. That is, the jet-type airflow crusher obtains a fine powdery powder by accelerating an object to be crushed with an airflow at a speed higher than the sonic velocity by a pressure reducing part supply type powder accelerator to collide with a collision wall surface, a toner, Plastics (epoxy, polyethylene, polyester, PVC, acrylic, polyethylene wack, phenolic resin, etc.), ceramics (silicon nitride, magnesium alumina oxide, zirconium dioxide, silicon carbide, boric acid, barium titanate, etc.), fiber materials, coke, Materials such as graphite and other inorganic organic general materials can be pulverized to a particle size of about 1 to 50 μm.

This type of depressurization part feed type powder accelerator is shown in FIG.
As shown in FIG. 3, the nozzle body 1 for supplying the compressed gas and the acceleration tube 3 connected to the outlet 2 side of the nozzle body 1 are configured so that the velocity of the fluid in the nozzle body 1 reaches the speed of sound at the throat portion 4. , Its pressure is halved. Then, the fluid that has flowed into the accelerating tube 3 and expanded further decompresses to become supersonic, and reaches the outlet 7 of the accelerating conduit 6. A supply port 8 for supplying an object to be accelerated into the acceleration conduit 6 is connected to the middle of the acceleration conduit 6, and the object to be sucked through the port 8 is
It reaches the outlet 7 together with the fluid in the acceleration line 6.

[0004]

The conventional depressurization part feed type powder accelerator is manufactured from a hard material such as metal or ceramics, and there are various restrictions and constraints based on the material. In other words, in the case of a metal decompression part-supply type powder accelerator, it is about 1/5 to 1/10 in terms of production period and price compared to ceramics, and it is relatively easy to handle and there is no risk of damage. It has the advantage of In addition, the processing accuracy is good, and even when the nozzle body 1 and the accelerating tube 3 are assembled, there is an advantage that a smooth fluid can be accelerated because a step is unlikely to occur between the internal passages. However, in the case of a metal accelerator, wear tends to occur on the wall surface of the internal passage due to the effect of the object to be accelerated, and it is difficult to use an accelerator made of a normal metal material for continuously producing fine powder, for example. Not suitable because it needs to be replaced more often.

On the other hand, ceramic accelerators are excellent in wear resistance, but are expensive in price, and their lifespan is almost always due to breakage due to cleaning work. Further, there is a drawback that the manufacturing accuracy varies greatly, and the accelerating state of the fluid and the object to be accelerated tends to change as the accelerating tube 3 is replaced.

Therefore, an object of the present invention is to provide a powder accelerator which can solve the above-mentioned conventional problems.

[0007]

In order to achieve the above object, according to the present invention, a compressed gas supply nozzle and an accelerating pipe connected to the compressed gas supply nozzle and having an acceleration target supply port. On the premise of a powder accelerator consisting of the accelerating pipe, the accelerating pipe is detachable from the accelerating pipe main body, and the accelerating pipe from the accelerating substance supply port to the accelerating pipe of the accelerating pipe. The outlet side passage forming component having a length dimension reaching the outlet of the above, and the acceleration pipe body, the outlet side passage forming component, and the compressed gas supply nozzle are made of a metal material.

According to this structure, since the accelerating tube is made of metal, it will not be damaged by the work such as cleaning, and the manufacturing accuracy will not vary. Further, of the wall surface forming the acceleration pipe, the portion from the object supply port to be accelerated, which is a part that is easily worn, to the outlet of the acceleration pipe is made of a separate component, so when wear occurs It is sufficient to replace only the outlet side passage forming component, and it is not necessary to discard the entire acceleration tube.

The outlet side passage forming component may be composed of a plurality of divided components which are divided in the axial direction of the acceleration conduit. According to this, since the part of the replacement part can be further limited, the cost of the replacement part can be reduced.

The diametrical expansion angles of the accelerating conduits of the plurality of divided parts may be set to different angles. According to this, it is possible to increase the speed of the accelerated object by setting the diameter expansion angle of each component in consideration of the influence of the accelerated object flowing from the accelerated object supply port.

The accelerating pipe line may be constituted by a straight passage having a diameter expansion angle of zero degrees from the object supply port to be accelerated to the outlet of the accelerating pipe line. According to this, it becomes possible to minimize the speed reduction due to the turbulence of the fluid flow that is likely to occur near the acceleration target supply port.

In addition to the accelerating tube main body and the outlet side passage forming component, the accelerating tube is detachable from the accelerating tube main body and is accelerated from an inlet of the accelerating tube of the accelerating tube. It may be configured with a metal inlet side passage forming component reaching the material supply port. According to this, the diameter of the entrance portion of the acceleration pipe, that is, the diameter of the throat portion of the acceleration pipe can be freely set and changed, so that the flow rate of the fluid passing through the acceleration pipe can be arbitrarily set.

The outlet-side passage forming component and / or the inlet-side passage forming component may be made of a material having a hardness higher than that of the acceleration tube body. According to this, the portion that is likely to be worn by the passage of the fluid is made of a high hardness material, so that it can be made excellent in wear resistance, and therefore the frequency of replacement of parts is reduced. It will be possible.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a depressurization part feed type powder accelerator 100 of the first embodiment. The accelerator 100 is similar to the conventional one,
Nozzle body 10 and outlet 1 of throat 11 of nozzle body 10
1a side is connected to the acceleration tube 12, and the acceleration tube 1
An accelerating object supply port 14 is formed at 2 in the middle of the accelerating pipeline 13. The accelerating tube 12 is composed of an accelerating tube body 15 and a passage forming component 16 that forms a part of the accelerating tube line 13. The passage forming component 16 has a length L from the port 14 to the outlet 17 of the acceleration pipeline 13.
1 and is detachably fitted into the main body 15. The nozzle body 10 and the accelerating tube 12 including the passage forming component 16 are made of metal.

Therefore, it is easy to maintain the machining accuracy of the nozzle body 10 and the accelerating pipe 12 at a high level. Therefore, when the both 10 and 12 are assembled, the throat portion 11 and the accelerating pipe line 13 are separated from each other. It is relatively easy to prevent a step from occurring. Further, a portion where wear is likely to occur due to use, that is, a portion of the wall surface of the accelerating pipe line 13 of the accelerating pipe 12 which is downstream of the accelerating substance supply port 14 is constituted by the passage forming component 16 which is detachable from the main body 15. Therefore, when wear occurs, the passage forming component 16 can be replaced with a new one. Therefore, since the main body 15 can be reused, it is not necessary to totally dispose of the acceleration tube 12 as a consumable item.

2 to 5 show another embodiment of the present invention, in which the same elements as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
FIG. 2 shows a powder supply accelerator 200 of the pressure reducing section supply type according to the second embodiment. In the accelerator 200, the accelerator 10 of the first embodiment is used.
Like 0, the accelerating tube 12 has a body 15 and a passage forming component 16
It consists of and. The passage forming component 16 included in the accelerator 200 is composed of a plurality of divided components divided along the axis of the conduit 13. More specifically, the passage forming component 16 includes, as an example thereof, a first member made of metal together.
Split component 21, second split component 22, and third split component 2
3 and these first to third divided parts 21 to 2
3 are arranged side by side in the axial direction of the conduit 13, and all of them are configured to be detachable from the main body 15. As a result, only the worn parts can be replaced, so that the cost required for the consumable parts can be further reduced as compared with the accelerator 100 of the first embodiment. The pipe line forming component 16 includes the first to third components 21 as described above.
It may be composed of three parts such as ~ 23, but 4
It goes without saying that it may be composed of three or more parts.

FIG. 3 shows a powder accelerator 300 of the pressure reducing section supply type according to the third embodiment. The third embodiment is also a modification of the second embodiment described above. That is, in the accelerator 300, the passage forming component 16 included in the accelerator 300 is
It is composed of three metallic divided parts 31 to 33 arranged side by side along the axis of the pipe line 13, and the divided parts 31 to 33 are the main body 1
It is configured to be attachable / detachable to / from 5. The angle of the inner wall surface of the first divided part 31 forming the conduit 13 is set to θ1, the angle of the inner wall surface of the second divided part 32 is set to θ2, and the angle of the inner wall surface of the third divided part 33 is set to θ3. Is set to. Specific angles of these angles θ1 to θ3 may be set, for example, to an angle that can accelerate the object to be accelerated supplied from the port 14 to the conduit 13.

FIG. 4 shows a pressure reducing part feed type powder accelerator 400 of a fourth embodiment. In the accelerator 400, the acceleration tube 12
Is composed of a main body 40, an inlet side passage forming component 41, and an outlet side passage forming component 42. Inlet side passage forming part 41
Is the length L from the inlet of the acceleration pipeline 13 to the port 14.
2, the outlet-side passage forming component 42 has a length dimension L1 from the acceleration target supply port 14 to the outlet 17 of the acceleration pipeline 13.
have. These passage forming parts 41, 42 are formed in the main body 4
0 is detachably fitted into the passage forming parts 41, 4
The accelerating tube 12 containing 2 is made of metal. According to the present embodiment, since the passage diameter inside the inlet-side passage forming component 41 can be freely changed, it becomes possible to arbitrarily set the flow rate of the fluid passing through the depressurization unit feed type powder accelerator 400.

FIG. 5 shows a depressurization part feed type powder accelerator 500 of the fifth embodiment. This embodiment corresponds to the second embodiment described above,
This is equivalent to a modification of the third embodiment, and the diametrical expansion angles θ1, θ2, θ3 of the inner wall surfaces of the three metal parts 51 to 53 constituting the passage forming part 16 are all set to zero degrees, and thereby acceleration is achieved. In the pipe line 13, the passage shape of the portion L1 from the accelerated substance supply port 14 to the outlet 17 is configured to be a straight passage having the same diameter in the axial direction. According to the fifth embodiment, it is possible to minimize the speed decrease due to the turbulence of the fluid flow generated near the port 14.

Although the respective embodiments of the present invention have been described above, the passage forming parts 16 and 42 and the metallic split parts 21 and 2 are described.
All or part of 2, 31 to 33 may be made of a material having a hardness higher than that of the main body 15 or the inlet side passage forming component 41. According to this, the frequency of exchanging consumable parts can be reduced.

The above-mentioned accelerators 100, 200, 300,
These accelerators are shown in FIG. 6 to evaluate 400,500.
The test was carried out by incorporating it in the jet airflow crusher 60 shown in. The jet-type airflow crusher 60 has a crushing chamber 61, and in the crushing chamber 61, the depressurization unit feed type powder accelerator 10 described above is provided.
0 was set. The accelerated object 62 accelerated by the accelerator 100 or the like is a collision plate 63 installed in front of the accelerator 100 or the like.
The crushed material 64 collided with and was crushed, and the crushed material 64 generated as a result was discharged by the classifier 65 if it had a particle diameter of a predetermined value or less.
On the other hand, those having a large particle size that has not been discharged from the classifier 65 are merged with the accelerated substance 62 flowing into the accelerated substance supply port 14 through the return pipe 66 and then passed through the port 14 again in the crushing chamber 61. Crushed. Particles 67 discharged from the classifier 65
In order to maintain the diameter of the accelerating tube to a predetermined particle diameter, the accelerating tube 10 is determined by how many objects 62 to be accelerated can be supplied into the accelerating tube 100 or the like.
The speed increasing ability of 0 etc. was judged.

As the object 62 to be accelerated, the polyester resin 1
A toner pigment having a composition of 00 parts by weight and 8 parts by weight of a phthalocyanine-based pigment was used. This toner pigment was mixed using a mixer to obtain a mixture. This mixture was melt-kneaded at about 200 ° C. using an ecrutruder, then cooled and solidified, and the cooled mixture of the melt-kneaded product was heated to 200 with a hammer mill.
Particles of ˜2000 μm were roughly pulverized, and this coarsely pulverized material was used as an accelerated object 62. A fixed wall type wind power classifier was used as the classifier 65.

Evaluation test of the accelerator 100 of the first embodiment Compressed air having a pressure of 0.588 MPa was introduced from the nozzle body 10. Further, the acceleration target 62 is fed from the acceleration target supply port 14.
It was supplied at a rate of 50 Kg / Hr. Fine powder in the obtained pulverized product 64 is removed as a classified powder by a classifier 65, and coarse powder is
Again, the powder raw material was charged into the accelerator 100 from the port 14 as the substance 62 to be accelerated. As a result, the volume average particle diameter was 9 μm. Continuous operation was performed here for 6 months. The accelerator tube body 15 and the passage forming component 16 of the accelerator 100 are made of SUS304. The diameter expansion angle θ of the acceleration conduit 13 was 6 degrees. The processing accuracy was plus or minus 0.05, the passage forming component 16 was replaced every month, and the cause of the replacement was internal wear.

Evaluation test of accelerator 200 of the second embodiment Compressed air having a pressure of 0.588 MPa was introduced from the nozzle body 10. Further, the acceleration target 62 is fed from the acceleration target supply port 14.
It was supplied at a rate of 50 Kg / Hr. Fine powder in the obtained pulverized product 64 is removed as a classified powder by a classifier 65, and coarse powder is
Again, the powder raw material was charged into the accelerator 200 from the port 14 as the substance 62 to be accelerated. As a result, the volume average particle diameter was 9 μm. Continuous operation was performed here for 6 months. The accelerator tube body 15 and the passage forming component 16 of the accelerator 200 are made of SUS304. The diameter expansion angle θ of the acceleration conduit 13 was 6 degrees. The processing accuracy is plus or minus 0.05, and only the first divided part 21 of the passage forming part 16 was replaced.
The replacement frequency was one month, and the cause of the replacement was internal wear.

Evaluation test of the accelerator 300 of the third embodiment Compressed air having a pressure of 0.588 MPa was introduced from the nozzle body 10. Further, the acceleration target 62 is fed from the acceleration target supply port 14.
It was supplied at a rate of 60 kg / hr. Fine powder in the obtained pulverized product 64 is removed as a classified powder by a classifier 65, and coarse powder is
Again, the powder material was charged into the accelerator 300 from the port 14 as the substance 62 to be accelerated. As a result, the volume average particle diameter was 9 μm. Continuous operation was performed here for 6 months. The accelerator tube body 15 and the passage forming component 16 of the accelerator 300 are made of SUS304. The diameter expansion angle θ1 of the first divided part 31 of the passage forming part 16 = 7 degrees, and the diameter expansion angle θ2 of the part 32.
= 6 degrees, the diameter expansion angle θ3 of the part 33 = 5 degrees, the processing accuracy is plus or minus 0.05, and only the part 31 of the passage forming part 16 was replaced. The replacement frequency is one month,
The cause of replacement was internal wear.

Evaluation test of the accelerators 300 and 400 of the fourth embodiment The passage forming component 16 of the accelerators 300 and 400 was composed of four components arranged side by side in the axial direction. In the passage forming component 16, the diametrical expansion angle of the first divisional component is θ1 = 7 degrees, the diametrical expansion angle of the second divisional component is θ2 = 6 degrees, and the diametrical expansion angle of the third divisional component is in order from the port 14 side. θ3 = 5 degrees, fourth split part 41
The expansion angle was set to θ4 = 8 degrees, and the processing accuracy was plus or minus 0.05. And the pressure from the nozzle body 10
Compressed air of 0.588 MPa was introduced. Further, the acceleration target 62 was supplied from the acceleration target supply port 14 at a rate of 65 kg / hr. The fine powder of the obtained pulverized product 64 was removed as a classified powder by a classifier 65, and the coarse powder was again charged into the accelerator from the port 14 together with the powder raw material as an accelerated product 62. As a result, the volume average particle diameter was 9 μm. Continuous operation was performed here for 6 months. The accelerator tube body 15, the front passage forming component 41, and the passage forming component 16 of the accelerator are all made of SUS304. First of the passage forming components 16
I replaced only the parts. The replacement frequency was one month, and the cause of the replacement was internal wear.

Evaluation test of the accelerators 300 and 400 of the fifth embodiment Of the passage forming parts 16 of the accelerators 300 and 400, the divided parts 31 are made of TiC in this order from the port 14 side, and the divided parts 32 and 33 are both SUS304. Made in. Further, the acceleration tube body 15 is made of SUS304. The processing accuracy of the parts 31 was plus or minus 0.1, and the processing accuracy of the parts 32 or the like was plus or minus 0.05. Then, compressed air having a pressure of 0.588 MPa was introduced from the nozzle body 10. In addition, the acceleration target 62 is 65 kg / H from the acceleration target supply port 14.
Supplied at a rate of r. Fine powder of the obtained pulverized product 64 is removed as a classified powder by a classifier 65, and coarse powder is
From the port 14, the powder raw material was charged into the accelerator as an object to be accelerated 62. As a result, the volume average particle diameter was 9 μm. Continuous operation was performed here for 6 months. The parts were not replaced because internal wear of the parts did not occur.

Evaluation test of the accelerator 500 of the sixth embodiment Compressed air having a pressure of 0.588 MPa was introduced from the nozzle body 10. Further, the acceleration target 62 is fed from the acceleration target supply port 14.
It was supplied at a rate of 70 kg / hr. Fine powder in the obtained pulverized product 64 is removed as a classified powder by a classifier 65, and coarse powder is
Again, the powder material was charged into the accelerator 500 from the port 14 as the substance 62 to be accelerated. As a result, the volume average particle diameter was 9 μm. Continuous operation was performed here for 6 months. The accelerator tube body 15 and the passage forming component 16 of the accelerator 500 are made of SUS304. The processing accuracy was plus or minus 0.05, and only the part 51 of the passage forming part 16 was replaced. The replacement frequency was one month, and the cause of the replacement was internal wear.

Evaluation Test of Conventional Accelerator as Comparative Example A test was performed by incorporating a conventional SiC accelerator (FIG. 7) into the crusher 60 of FIG. Compressed air having a pressure of 0.588 MPa was introduced from the nozzle body 14. Further, the acceleration target 62 was supplied from the acceleration target supply port 14 at a rate of 45 Kg / Hr. The fine powder of the obtained pulverized product 64 was removed as a classified powder by a classifier 65, and the coarse powder was again charged into the accelerator as a substance to be accelerated 62 from the port 14 together with the powder raw material. As a result, the volume average particle diameter was 9 μm. Continuous operation was performed here for 6 months. The diametrical expansion angle θ of the acceleration conduit 6 was 6 degrees, and the processing accuracy was plus or minus 0.5. The replacement frequency was 6 months, and the cause of the replacement was damage during cleaning work.

[0030]

As is apparent from the above description, according to the present invention, since it is made of metal with excellent manufacturing accuracy, a step is formed at the connection of the fluid flow path between the compressed gas supply nozzle and the acceleration tube. Moreover, since it is not necessary to discard the entire acceleration tube due to wear of the wall surface forming the acceleration flow path in the acceleration tube, it is possible to reduce the cost of consumables.

[Brief description of drawings]

FIG. 1 is a sectional view of a powder accelerator according to a first embodiment.

FIG. 2 is a sectional view of a powder accelerator according to a second embodiment.

FIG. 3 is a sectional view of a powder accelerator according to a third embodiment.

FIG. 4 is a sectional view of a powder accelerator according to a fourth embodiment.

FIG. 5 is a sectional view of a powder accelerator according to a fifth embodiment.

FIG. 6 is an overall system diagram of a jet airflow crusher used for a comparative test.

FIG. 7 is a sectional view of a conventional powder accelerator.

[Explanation of symbols]

 100 Powder Accelerator of 1st Example 200 Powder Accelerator of 2nd Example 300 Powder Accelerator of 3rd Example 400 Powder Accelerator of 4th Example 500 Powder Accelerator of 5th Example 10 Nozzle body 12 Acceleration Pipe 13 Accelerating Pipeline 14 Accelerated Object Supply Port 16 Exit Side Passage Forming Part 41 Inlet Side Passage Forming Part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiko Watanabe 1-3-6 Nakamagome, Ota-ku, Tokyo Within Ricoh Co., Ltd. (72) Satoru Okano 1-3-6 Nakamagome, Ota-ku, Tokyo Shares Company Ricoh

Claims (6)

[Claims] 1. A powder accelerator comprising a compressed gas supply nozzle and an accelerating pipe connected to the compressed gas supply nozzle and having an accelerating substance supply port, wherein the accelerating pipe is an accelerating pipe body and the accelerating pipe. And an outlet side passage forming part which is detachable from the main body and has a length dimension from the acceleration target supply port to the outlet of the acceleration pipe of the acceleration pipe of the acceleration pipe. A powder accelerator, wherein the outlet side passage forming component and the compressed gas supply nozzle are made of a metal material. 2. The powder accelerator according to claim 1, wherein the outlet-side passage forming component is composed of a plurality of divided components that are divided in the axial direction of the acceleration conduit. 3. The powder accelerator according to claim 2, wherein the diameter expansion angles of the portions of the acceleration pipes of the plurality of divided parts are set to different angles. 4. The accelerating pipe line is constituted by a straight passage having a diameter expansion angle of zero degrees from the accelerating object supply port to the outlet of the accelerating pipe line. The powder accelerator according to item 1. 5. The accelerating tube is further made detachable from the accelerating tube main body and is made of a metal that extends from an inlet of the accelerating tube of the accelerating tube to the accelerating object supply port. The powder accelerator according to any one of claims 1 to 4, further comprising: 6. The powder accelerator according to claim 5, wherein the outlet-side passage forming component and / or the inlet-side passage forming component is made of a material having a hardness higher than that of the acceleration tube main body.