JPS62193659A - Electromagnetic type crushing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

In this invention, a large number of actuating bodies made of ferromagnetic material are housed in a processing container, and this processing vessel is placed in a magnetic field where a moving magnetic field acts to cause intense random motion of the actuating bodies due to electromagnetic force. The present invention relates to an electromagnetic pulverization processing apparatus for pulverizing various objects to be processed, such as pulverizing material such as metal powder, coal, etc., supplied into a processing container into fine powder of approximately several tens of microns.

[Prior art and its problems]

As this type of electromagnetic pulverization processing equipment, Figures 4 and 5
The device shown in the figure has already been proposed in, for example, Japanese Unexamined Patent Publication No. 58-45754 and is well known. That is, in FIGS. 4 and 5, 1 is a processing container made of non-magnetic material, 2 and 3 are a pair of moving magnetic field generators arranged oppositely on both sides of the processing container 1, and 4 is an iron A working body 5, which is a rod-shaped piece made of a ferromagnetic material such as a magnetic alloy, is a workpiece housed in the processing container 1 together with the working body 4. Furthermore, the moving magnetic field generator 2.3 is well known as a so-called linear motor, and is configured by winding, for example, a three-phase AC coil 7 around a coil slot of an iron core 6. By feeding power while moving magnetic fields φ1. ψ2 is generated. With the above configuration, the moving magnetic field φ1. A moving magnetic field φ1.
A rotating magnetic field is formed by the combination of φ2, and due to the electromagnetic force based on the interaction between this rotating magnetic field and the actuating body 4, the actuating body 4 receives a translational force in the direction of movement of the magnetic field, a floating blade, and a rotational torque. , and further collision between working bodies 2
Due to the collision between the actuator and the wall of the processing container, the actuator 4 causes violent random motion within the processing container. As a result, the object to be processed 5 supplied into the processing container 1 is finely pulverized by collision with the actuating body due to the random movement of the actuating body 4. As described above, in this type of electromagnetic pulverization processing apparatus, the pulverization of the object to be processed progresses through collisions between the object to be processed and the operating body and collisions between the objects to be processed. Therefore, in order to increase the efficiency of the pulverization process, it is effective to adjust the particle size of the material to be processed by increasing the chances of collisions between particles of the same particle size within the processing container, and also to improve the particle size of the material being pulverized to the desired particle size. It is necessary to quickly remove the crushed product from the container before it is over-pulverized, and to prevent a decrease in the crushing efficiency due to over-pulverization. Furthermore, if the amount of the material to be processed is too large relative to the internal volume of the processing container, the random motion of the actuating body 4 will be inhibited, resulting in an increased loss of crushing energy; conversely, if the amount of material to be processed is too small, the amount of material to be processed will be Since this decreases the processing capacity, it is desirable to carry out the pulverization process with an appropriate amount of the material to be processed stored in the processing container 1 at all times. However, as shown in Figures 4 and 5, the batch processing method, in which the crushed material is consistently pulverized from coarse to fine pulverization in the same working space inside the processing container, has low operational efficiency and There is a problem in that a large amount of ultrafine powder is generated which is over-pulverized to a particle size below the desired particle size, and this ultrafine powder becomes an obstacle to the grinding operation, causing a rapid decrease in grinding efficiency. Another method is to simply separate the processing containers into one for coarse pulverization and one for fine pulverization, and transfer the material to be processed at the coarse pulverization stage that has been pulverized in the pulverization container to the pulverization container for pulverization. However, with this method, the amount of material to be processed taken out of the coarse pulverization processing container and put into the pulverization processing container is not necessarily an appropriate amount for the internal volume of the pulverization processing container. In this case, the entire device cannot achieve sufficient results in improving the grinding efficiency.

[Purpose of the invention]

This invention has been developed in consideration of the above points, and it is possible to maintain the filling amount of the processed material in the processing container that is continuously supplied at an appropriate level while adjusting the particle size of the processed material in the pulverization process. It is an object of the present invention to provide a continuous processing type electromagnetic pulverization device that can significantly improve pulverization efficiency by preventing pulverization.

[Key points of the invention]

In order to achieve the above object, the present invention divides the inside of a processing container into a plurality of stages of grinding chambers, a coarse grinding chamber and a fine grinding chamber, in order from the inlet side. Each crushing chamber is equipped with a classification sieve for coarse powder and fine powder, and the internal volume of each stage of the crushing chamber is calculated based on the rate of the classification sieve produced in the processing chamber per unit processing time and unit volume. By dividing the particle size into the reciprocal ratio of the amount of particles produced in the particle size range corresponding to the grain size, the particle size of the material to be processed is adjusted within a certain range in each stage of the grinding chamber, increasing the grinding effect. The filling amount of the material to be processed in each grinding chamber that is continuously supplied is always maintained at an appropriate amount, thereby improving the grinding efficiency of the apparatus as a whole.

[Embodiments of the invention]

FIG. 1 shows the configuration of a continuous processing electromagnetic crushing apparatus according to an embodiment of the present invention, and the same members corresponding to FIGS. 4 and 5 are given the same reference numerals. . That is, the processing container 1 accommodates a large number of working bodies 4 therein.
The front and rear surfaces are opened to serve as the inlet and outlet of the processed material.
And on the inlet side there is a supply pipe 8 for the material to be treated. It is connected via a hopper 9 to a feeder 10 for quantitatively supplying the material to be processed, and an air flow type crushed product recovery device 12 such as a bag filter is connected to the outlet side via a crushed product take-out pipe 11. Note that 13 is an air blower for generating a conveying air flow, 14 is a product recovery valve, and 15 is a recovery container for crushed products, and these constitute a continuous pulverization processing apparatus using an air flow conveyance system. Regarding the processing container 1, according to the present invention, the processing container 1 has an internal space divided in series from the inlet side into a coarse grinding chamber IA and a fine grinding chamber IB, and a coarse grinding chamber IA and a fine grinding chamber IB. A classification sieve 16^ for coarse powder and a classification sieve 1 for fine powder are installed at the boundary and at the exit side end of the fine grinding chamber IB, respectively.
6B is deployed as an intermediary. A perforated plate 17 for protecting the sieves is installed on the inside of the crushing chamber to cover the sieve surfaces of the classification sieves 16A and 16B. This perforated plate 17 is made of, for example, a punched metal plate which has a diameter larger than the sieve mesh of the classification sieve and is stronger than a classification sieve which has holes dispersedly opened in the plate surface to the extent that the working body 4 cannot pass through. On the other hand, the above-mentioned coarse grinding chamber IA and fine grinding chamber I
The internal volumes Vl and V2 of B are unit processing time and unit volume light of each grinding chamber IA, respectively. Of the crushed products produced in the IB room, each classification sieve 1
The amount of particles produced in the particle size range that can pass through the sieves of 6A and 16B is Pi, P2, and the amount of particles produced Pi, P2
It is divided and defined by the ratio of the reciprocal of . Note that each of the crushing chambers IA and IB is filled with a predetermined amount of the working body 4 in advance. With the above configuration, when the workpiece 5 is continuously fed into the hopper 9 from the feeder 10 in fixed quantities, the workpiece 5 is transferred to the proa 15.
The particles are introduced into the coarse pulverization chamber IA of the processing container 1 through the supply pipe 8, and are coarsely pulverized there. Thereafter, the coarse powder 5a passes through the mesh of the coarse powder classification sieve 16^ and moves to the pulverization chamber IB, where it is pulverized. Further, the fine powder 5b that has been further finely crushed in the fine crushing chamber IB passes through the sieve of the fine powder classification sieve 16B, and enters the crushed product recovery device 12 through the take-out pipe 11 by air flow conveyance.
Here, it is separated and collected from the conveying airflow. In addition, the collection device 12
By opening the collection valve 14, the crushed material collected is taken out as a product to a collection container 15. In the above-mentioned pulverization process, the unit processing time and unit volume of light of the particle size range that can pass through the sieve of the coarse-powder classification sieve 16A among the coarse powder 5a that has been pulverized in the coarse-pulverization chamber IA as described above. If the amount of particles produced is PL, and the internal volume of the coarse grinding chamber 1 is vl, then the amount of processed material passing through the coarse powder classification sieve 16A together with the conveying airflow and transferred to the fine grinding chamber IB per unit time is 0
1 is Q1 Ki PIX 1----------1・------
---------------- (11, unit processing of the particle size range that can pass through the fine powder classification sieve 16B among the fine powders 5b similarly pulverized in the pulverization chamber IB) If the amount of particles produced per time and unit volume of light is P2.If the internal volume of the pulverization chamber IB is v2, then the crushed particles of the desired particle size that pass through the sieve openings of the differentiation sieve 16B and are taken out to the recovery device 12 side. Manufactured product 5c
The amount taken out per unit time 02 is: Q 2 = P 2 x V 2
−−−−−−−−−−−−(2). Therefore, the internal volumes VL V2 of the coarse grinding chamber 18 and the fine grinding chamber IB are respectively the particle production 1tP1. Since it is set to be the ratio of the reciprocal of P2, if the constant of proportionality is k, then V 1 = ](/ P 1−−−−−−−−−−−−−
−−−−−−−−−−−−−−(3) v 2 = k
/ P 2---------------------
--- (represented as 41. Therefore, the above (11
, ((3) into equation 21. Substituting equation (4), Q1=P1・k /P1= k, Q2=P2・k/
P2=, and Ql and Q2 are both equal. In other words, the introduction and discharge of the material to be processed is balanced between the coarse grinding chamber 18 and the fine grinding chamber IB, so that the filling amount of the material to be processed in each of the grinding chambers IA and ITI is always approximately constant and appropriate. Therefore, the electromagnetic pulverization processing apparatus can be operated under optimum operating conditions at all times. Moreover, inside the grinding chambers IA and IB of each stage, there are objects to be processed whose particle sizes are adjusted to be approximately the same, so that the grinding proceeds evenly and over-grinding does not occur. It will be possible to suppress it. In order to confirm the above effects, the inventor conducted an experiment using permalloy metal powder as a workpiece, and the following results were obtained. In other words, the unit processing time and particle size distribution per unit volume obtained when permalloy metal powder with a wide range of particle size compositions is housed in a single container and subjected to electromagnetic pulverization is 70% compared to the wirework in Figure 3. The particle size distribution when electromagnetic pulverization was performed using a fine powder classified as below mesoscale was line (■). Here, with the apparatus shown in FIG.
The sieve size of the powder classification sieve 16B is set to 100 mesh, and the internal volume ratio of the coarse grinding chamber 18 and the fine grinding chamber IB is set to 1/1.
(100-92,5): 1/(100-86
, 5) -9:5 setting and pulverization, and the above-mentioned fine powder classification sieve 1
A comparison was made with a case where the fine powder classification sieve 16B was installed only at the outlet end of the processing container 1 without using the pulverization process, and the pulverization capacity of the former was improved by about 18% compared to the latter. The results were obtained. Moreover, each classification sieve 16A, 16
A perforated plate 17 for protecting the sieve is installed on the indoor side so as to cover the sieve surface of B.
It was confirmed that the intervening arrangement prevented the operating body 4 from directly colliding with the classification sieves 16A and 16B, and that the crushing process could be carried out stably for a long period of time without damaging the classification sieves. Next, FIG. 2 shows another embodiment of the invention. The difference between this embodiment and the embodiment shown in FIG. 1 is that the processing container 1 is installed in an inclined position with its outlet side facing down, and the material to be processed 5 is transported by gravity transport. The internal volumes of the coarse grinding chamber 18 and the fine grinding chamber IB divided into the processing container 1, and the classification sieves 16A and 16B for coarse powder and WI powder are the same as those shown in FIG. As a result, the same effect as in FIG. 1 can be obtained, and on the other hand, the crushed material recovery device such as a bag filter, a blower, etc. incorporated in the embodiment of FIG. 1 can be omitted, and equipment costs and operating costs can be reduced.

【Effect of the invention】

As described above, according to the present invention, the interior of the processing container is divided into a plurality of grinding chambers including a coarse grinding chamber and a fine grinding chamber in order from the inlet side, and the boundaries between each chamber and the outlet side end of the container are Coarse powder corresponding to each grinding chamber. In addition to being equipped with a classification sieve for fine powder, the internal volume of each stage of the crushing chamber can be divided into particles within the particle size range corresponding to the sieve mesh of the classification sieve produced in the processing chamber per unit processing time and unit volume. By dividing the product into reciprocal ratios, the particle size of the material to be processed in each stage of the grinding chamber can be adjusted within a certain range to enhance the grinding effect, and the amount of material to be processed in each grinding chamber can be adjusted to within a certain range. It is possible to provide an electromagnetic pulverization device with excellent pulverization efficiency, which can always maintain an appropriate amount of pulverization and improve the pulverization efficiency of the entire device.

[Brief explanation of drawings]

Figures 1 and 2 are configuration diagrams of different embodiments of the present invention, Figure 3 is a particle size distribution diagram of the experimental results of electromagnetic pulverization of permalloy metal powder as a workpiece, and Figure 4 is a diagram of electromagnetic pulverization. The principle configuration diagram of the device, Figure 5 is the arrow V in Figure 4.
-V sectional view. In each figure, 1: processing container, IA: coarse grinding chamber, IB: fine grinding chamber, 2.
3: Moving magnetic field generator, 4: Working body, 5: Processed object, 5
a: Coarse powder, 5b: P powder, 5c: Crushed product, 16A: Classifying sieve for coarse powder, 16B; Classifying sieve for fine powder, 17; Fig. 1 bC Fig. 2 Fig. 4 Fig. 5

Claims (1)

[Scope of Claims] 1) A non-magnetic processing container containing a large number of actuating bodies made of ferromagnetic material, and generating moving magnetic fields in opposite directions opposite to each other on both sides of the processing container. A moving magnetic field generating device is used to pulverize the processed material supplied into the processing container by the random movement of the operating body generated by electromagnetic force based on the interaction with the moving magnetic field, and the crushed product is processed. In an electromagnetic pulverization processing device that is taken out from a container, the inside of the processing container is divided into a plurality of stages of pulverization chambers, a coarse pulverization chamber and a fine pulverization chamber, in order from the entrance side, and a boundary between each chamber and an outlet of the container. Coarse powder corresponding to each grinding chamber at the side edge,
A classification sieve for fine powder is installed, and the internal volume of each stage of the crushing chamber is divided into particles with a particle size range corresponding to the sieve size of the classification sieve that is generated in the processing chamber per unit processing time and unit volume. An electromagnetic crushing device characterized in that it is configured to divide the production amount into reciprocal ratios. 2) In the electromagnetic crushing apparatus according to claim 1, a perforated plate for protecting the sieve covers the sieve surface of the classifying sieve in each stage of the crushing chamber to prevent collision between the operating body and the classifying sieve. An electromagnetic crushing device characterized by being equipped with.