JPS5814823B2 - Eddy current fine grinder - Google Patents

Description

[Detailed Description of the Invention] Explanation of the Scope of Claims The present invention relates to a vortex-type pulverizer for producing fine powder such as carbon for copying. This invention relates to a pulverizer in which porous cylinders made of wire mesh or the like are provided in multiple stages in the radial direction on a rotating shaft, and the pulverization is carried out by the cooperation of these cylinders in a swirling flow. The raw material from the suction port provided near the center of the lid is easily sucked by creating a large centrifugal static pressure difference between the suction port and the discharge port of the top lid provided outside of the suction port, and the outermost part has a large specific gravity. , an invention relating to a whirlpool-type pulverizer that recirculates large particles of insufficiently pulverized waste by connecting a suction port and a discharge port on the outside of the stator, and is equipped with a device for adjusting the position of the discharge port. be.

<Prior Art> As is well known, carbon and pigments for copying require finely pulverized raw materials, and the pulverizers that have been used in practice so far include jet mills. The disadvantage is that the required power is extremely large, resulting in high costs, and the grinding process is shot-like, resulting in large variations in the grinding particle size.

<Problem> By the way, like the fine grinder seen in Japanese Patent Publication No. 38-16428, a porous cylinder is attached to a vertical cylindrical casing, and a rotary shaft mounted vertically in the casing is rotated at high speed.
There is a pulverizing device that pulverizes raw material particles in an upward vortex by cooperation of a plurality of radial porous cylinders provided on the rotating shaft and the above-mentioned high-speed rotating porous cylinder.

Although the seed pulverizer has a good pulverizing action in principle, it has the disadvantage that it is not adaptable to the characteristics of the powder due to its poor machine structure, and the swirling airflow is obstructed. is,
There is a disadvantage that fine grinding is not carried out as designed, and the disadvantage is that the structure is complicated, which increases the cost.The maintenance cost is also high, and there are also problems such as high vibration and noise, and large space occupancy. there were.

<Objective> The object of the present invention is to solve the technical problem to be solved between the apex of the pulverizing apparatus based on the above-mentioned prior art, and to solve the problem of cooperation between the porous cylindrical rotor and the porous cylinder in the multi-stage pulverizing process that is most suitable for pulverizing. While having the advantage of a dynamic mechanism, the flow and especially the recirculation of the raw materials to be processed are considered as the primary priority, and products with a uniform particle size distribution can be obtained, thereby improving the utilization of powder in various manufacturing industries. The purpose of this invention is to provide an excellent vortex-type pulverizer that will benefit the field.

<Structure> In accordance with the above-mentioned object, the structure of the present invention, which is summarized in the above-mentioned claims, is that the swirling flow generated by the rotation of the rotor is caused by centrifugal force to connect the suction port near the center provided in the lower cover and the exhaust near the outer periphery provided in the upper cover. A large static pressure difference is created between the outlet and the raw material with a large specific gravity so that even high-density raw materials can be sucked in. The pulverization is carried out effectively, and the finely pulverized materials are discharged and collected, resulting in large specific gravity,
Large particles that are insufficiently pulverized are guided to the circulation pipe outside the casing from the discharge port near the outer periphery and sucked into the suction port again so that they can be pulverized again. A technology in which particles of fine particle size are circulated within the casing to be re-pulverized, and in the above-mentioned discharge process, the opening of the discharge port is made radially adjustable in position with respect to the upper cover, thereby making it possible to grind the particles. The measures taken were as follows.

Next, one embodiment of the present invention will be described below based on the drawings.

It should be noted that the same parts will be described with the same reference numerals throughout all the figures.

Reference numeral 1 denotes a vortex-type pulverizer which constitutes the gist of the present invention, and a frame 3 fixed on a base 2 has a vertical cylindrical casing 4.
An upper lid 5 and a lower lid 6 are integrally provided on the upper and lower sides, and a porous cylinder 7 made of wire mesh or the like is attached to the inner surface, and a cone 8 in the shape of an inverted truncated cone is attached from the lower edge of the porous cylinder 7. has a plurality of suction ports 9, 9, . . . opened near the center of the lower lid 6.
attached to the outside of the

On the other hand, a discharge port 10 is provided in the upper lid 5 on the outer side of the upper front suction ports 9, 9, .

Further, another outlet 10' is provided on the outer side of the outlet 10, that is, closer to the circumferential side. connected to one of the

On the other hand, a rotary shaft 16 is rotatably mounted on appropriate bearings 14 and 15 provided at the centers of the upper and lower lids 5 and 6, concentrically with the casing 4, and the rotary shaft 16 has side shafts arranged in multiple stages in the axial direction. Porous cylindrical bodies 18, 18, etc. made of wire mesh, etc., serving as rotors are extended horizontally in the radial direction via extended horizontal arms 17, 17, so as to prevent the rotational moment from becoming unbalanced. There is.

A belt 23 is stretched between the pulley 19 provided at the lower end of the rotating shaft 16 and a pulley 22 of a variable speed motor 21 fixed to a frame 20 attached to the base 2. There is.

In addition, 24 is a hopper for storing carbon raw material for copying,
A vibrating feeder 25 provided at the discharge port faces a chute 26 open to the atmosphere, and the chute 26 is connected to one of the suction ports 9 via a transport pipe 27.

As shown in FIG. 3, adjusting plates 28, 28' as radial opening position adjusting devices make openings 29, 29' in the upper cover 5 of the casing 4 at the bases of the discharge ports 10, 10'. It has handles 30, 30' on the outside and is slidably provided (this portion is omitted in FIG. 1).

) Adjustment plates 28 and 28' are independently slid by operating the handles 30 and 30' in the radial direction. The positions at which the crushed material is discharged to 10' can be made to differ by seven radii.

In the above configuration, the variable speed motor 21 and the vibration feeder 2
5, the rotating shaft 16 rotates at high speed, a swirling airflow is generated in the casing 4 by the rotor 18, and the suction port 9
, 9... are provided closer to the center, while the discharge ports 10, 10' are provided closer to the outside than the suction port 9, so that a large static pressure difference in the axial direction is formed due to centrifugal force. The carbon raw material cut out from 24 is in chute 2
At 6, air is transported and sucked together with air through the transport pipe 27, and those with large specific gravity are also sucked from the suction ports 9, 9... by the static pressure difference, enter the casing 4, ride the swirling upward airflow, and are sucked into the rotor. Due to the cooperation between the porous cylinder 18 and the porous cylinder 7, the porous cylinder 18 receives a pulverizing action, rotates upward while being pulverized, and reaches the discharge ports 10, 10'.

Since the former of the discharge ports 10 and 10' is formed relatively inside as described above, the finely pulverized material, which is relatively small in weight and in the form of small particles, is completely removed. The particles that are close to being finely pulverized are discharged and stored in the bag filter 12 as a product.

On the other hand, large-weight, large-grained, relatively insufficiently pulverized or unpulverized materials are discharged from the discharge port 10' under the influence of a large centrifugal force, and are returned to the suction port 9 via the circulation conduit pipe 13. 1
It is fed back to the air flow and is again carried by the swirling airflow due to the above-mentioned suction force, and is subjected to the pulverization process.

In addition, insufficiently pulverized materials that are not discharged from the discharge port 10' and fall from the front thereof descend toward the porous cylinder 7 of the stator, and smoothly descend from the cone 8 to the suction ports 9, 9, . . . It is re-suctioned and pulverized again.

In the process of repeating the above-mentioned circulation process, all the granular raw materials are pulverized after being sucked and stored in the bag tank 12 through the discharge port 10.

Therefore, the discharge ports 10, 10' have a kind of classification function in the pulverization process, and if this function is used, not only recycling fine pulverization via the circulation pipe 13 but also particle size You can plan to separate and store different products.

Therefore, in order to adjust the particle size of the circulating material from the discharge ports 10, 10' depending on the particle size, material, and degree of crushing of the carbon raw material, the adjusting plates 28, 28' are slid in the radial direction via the handles 30, 30'. It is possible to perform classification by changing the radial position of the discharge port.

In this way, a classification function can be provided, and the number of the discharge ports 10, 10' is two in the embodiment, but three or four.
In addition, as in the above-mentioned embodiment, insufficiently pulverized products of a specific particle size can be recirculated through the pipe 13 to produce classified products in the designed particle size range as much as possible. I can do it.

Also, depending on the operation, the entire treated amount can be recycled or the same particle size can be discharged.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various other embodiments and design examples can be adopted, and it goes without saying that the objects to be treated are not limited to pigments and copying carbon.

<Effects> According to the present invention, there is provided a vortex-type pulverizer in which the porous cylinder of the rotor is attached in multiple stages to the rotary shaft that is concentrically mounted within the porous cylinder of the stator that is attached to the vertical cylindrical casing. In this case, the undercover of the casing receives a discharge port and a suction port on the outside and the center, respectively, and a circulation pipe is provided in at least one of the discharge port and the suction port, so that basically the above-mentioned suction A static pressure difference occurs between the mouth and the discharge port due to centrifugal force, and raw materials are easily sucked through the suction port.Therefore, there is an advantage that even materials with large specific gravity such as original size can be suctioned. By installing a special circulation pipe, the unpulverized and insufficiently crushed materials centrifugally discharged are recirculated to the suction port, but in the recirculation process, the processing air flow and the pulverized material swirl are not disturbed. Therefore, since the processes of returning to the suction port and pulverization are separately distinguished, an excellent effect of efficient pulverization is achieved.

In particular, by arranging the circulation pipe outside the casing, not only the above-mentioned functions are separated, but also the rotational balance based on the relative rotation of the stator and rotor inside the casing is not disturbed, and therefore, the swirling vortex flow is prevented. Fine pulverization can be performed as designed without being disturbed or biased, and there is also an effect that no vibrations or noises are generated.

Furthermore, by providing an opening position adjusting device in the radial direction of the discharge port, the radial opening position of the discharge port can be freely changed. It is possible to discharge the processed material, so it has a kind of classification effect, and it is not only possible to classify and collect products, but also to recirculate particles of a specific particle size, making the classification more accurate. effect is produced.

The effect of this configuration is not the design of additional deformation of the mechanism within the casing, so the basic structure of the rotor and stator is not hindered in any way, and to that extent, the aircraft is compact, low power, and easy to use. There is also the advantage that excellent advantages such as operability are sufficiently maintained.

[Brief explanation of drawings]

The drawings are explanatory diagrams of one embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view schematically explaining the whole, FIG.
FIG. 3 is a longitudinal sectional view of the discharge port. 4...Casing, 7...Stator (porous cylinder)
, 16... Rotating shaft, 18... Porous cylinder (rotor)
, 1... Fine grinder, 6... Lower lid, 9... Suction port,
5... Upper lid, 10, 10'... Discharge port, 13...
Circulation path, 28, 29, 30. 28', 29', 30'・
...Opening position adjustment device.

Claims (1)

[Claims] 1. In a vortex-type pulverizer in which porous cylindrical bodies in the radial direction are attached as a rotor in multiple stages in the axial direction to a rotary shaft mounted vertically on a porous cylindrical stator housed in a vertical cylindrical casing, A suction port is provided, and a plurality of discharge ports provided in the top lid are provided outwardly with respect to the suction port, and the plurality of discharge ports are provided with a radial opening position adjustment device of the discharge port with respect to the top lid. A vortex-type pulverizer characterized by comprising: