JPS628216B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention accommodates objects to be processed such as solids, particles, liquids, etc. and a working piece made of ferromagnetic material in a processing container, and moves the object from the outside with respect to the container. The present invention relates to a moving magnetic field type processing apparatus that performs processing such as crushing, mixing, stirring, etc. of a workpiece by applying a magnetic field to cause intense random motion in a working piece.

As this type of moving magnetic field processing apparatus, those shown in FIGS. 1 and 2 have already been proposed. In the figure, reference numeral 1 denotes a processing container that houses an object to be processed 2 and a large number of working pieces 3 made of ferromagnetic materials. , 5 are arranged facing each other, and their moving magnetic fields are set in mutually opposite directions as shown by φ1 and φ2. The moving magnetic field generators 4 and 5 are well-known as so-called linear motors (hereinafter, the "moving magnetic field generator" will be referred to as "linear motor"), and for example, rotate a three-phase AC winding 6. Like an electric machine, it is constructed by being wound within a coil slot of an iron core 7, and receives power from a power source to form moving magnetic fields φ1 and φ2.

With this configuration, an electromagnetic force based on the interaction with the moving magnetic fields φ1, φ2 acts on the working piece 3 placed in the magnetic field where the moving magnetic fields φ1, φ2 act, thereby causing translation in the direction of the moving magnetic fields. Power,
In addition to being subjected to the levitation force and rotational torque of rotation around the center of gravity, collisions between the working pieces and collisions between the working pieces and the wall of the container are added, causing the working piece 3 to undergo intense random motion and move as a whole toward arrow P. A circular movement is performed to circulate inside the processing container 1 as shown in FIG. Processing operations such as crushing, mixing, and stirring of the object 2 to be processed are performed by the random and circular movement of the working piece. The motion of the working piece 3 in this case is proportional to the magnetic field strength of the linear meters 4 and 5, and the larger the current passing through the winding 6, the greater the electromagnetic force acting on the working piece 3. It is uneconomical to consume excess power, and it is therefore desirable to maintain sufficient motion of the working piece with as little power as possible to obtain high processing efficiency.

However, when the processing container 1 is configured as a rectangular container as shown in FIG. There is a phenomenon where they stay aligned at the top. After considering this phenomenon, it became clear that the cause lies in the following points. That is, when observing in detail the movement of the working piece 3 that moves around the inner circumference of the processing container 1,
The working pieces scattered near the linear motor 4 are influenced more by the moving magnetic field φ1 than by the moving magnetic field φ2, and are attracted toward the iron core surface while receiving a translational force that moves from right to left. On the other hand, the working piece near the linear motor 5 is strongly influenced by the magnetic field φ2 and moves from left to right while being attracted toward the iron core surface. And moving magnetic field φ1, φ2
When it reaches the downstream side, it collides with the right-angled wall surface of the corner of the processing container 1. Here, the working piece that reached the corner first is pushed back by the succeeding working piece, and changes its direction due to the rotation of the working piece itself and the repulsion due to the collision with the wall surface, and the working piece that is on the lower side of the processing container 1 Those on the upper side move downward, and when they eventually enter the magnetic field action area of the linear motor on the opposite side, they are translated again in the direction of the moving magnetic field. However, the change in the direction of motion at the corner portion is not smooth in the rectangular container shown in FIG. 1, and if the magnetic field strength of the linear motors 4 and 5 is not large enough, the working piece 3 will be attracted onto the wall of the container. They line up and stay on top of each other. In this case, if the currents of the linear motors 4 and 5 are increased, the rotational torque acting on the working piece 3 will overcome it, causing the working piece to disalign and start moving again. Increasing the power beyond its capacity is not a good idea in terms of operational efficiency, as it consumes extra power. In addition, when observing from the viewpoint of the processing operation of the processing object, in the one shown in Fig. 1, the movement of the working piece 3 does not sufficiently reach every corner of the container, so the movement at the corner of the processing container 1 is indicated by the symbol A. The corner part on the upstream side of the moving magnetic field becomes a blind spot in the circular motion of the working piece 3, and sufficient processing operations are not performed, and it is seen that a large amount of unprocessed material remains in this corner part, which causes the crushing. This is also a cause of lower processing efficiency. Particularly in the case of pulverization, a large amount of coarse powder remains because the pulverization does not proceed sufficiently, making it impossible to obtain a pulverized product with uniform particle size.

The present invention has been made in view of the above points, and its purpose is to eliminate the drawbacks of the above-mentioned conventional devices,
To provide an energy-saving moving magnetic field processing device with high processing efficiency, capable of maintaining the circular movement of a working piece with as little electric power as possible, and preventing the creation of blind spots in processing operations.

According to the present invention, this object is achieved by rounding down the corners of the processing container along the circumferential movement of the working piece, and configuring the container wall surfaces at the corner portions to be connected with inclined or arcuate wall surfaces.

The present invention will be explained below based on illustrated embodiments.

First, in the embodiment shown in FIG.
The corner portions of the processing container 1 along the circumferential movement path (arrow P), that is, the upper and lower wall surfaces 1A, 1 of the container 1 where the working piece 3 changes its movement direction.
Cut off the corners at the four corners where B intersects with the left and right sides 1C and 1D, and instead use the diagonal wall surface 1E where the internal angles intersect at an obtuse angle of 90 degrees or more to form the upper, lower, left, and right walls. It is structured so that the spaces are connected. According to the above configuration, the wall surface 1 is parallel to the moving magnetic fields φ1 and φ2.
The working piece 3 that has translated along A, 1B and reached its terminal is subjected to the moving magnetic fields φ1, φ as in the conventional case.
The liquid flows easily along the inclined wall surface 1E without directly colliding with the wall surfaces 1C and 1D perpendicular to the wall surface 2, and its direction of movement can be changed. In this way, the conventional alignment and stagnation phenomenon of the working pieces 3 is no longer observed, and smooth circular movement along the processing container can be maintained. Further, by rounding off the corners, there are no blind spots for processing the object 2, and the processing efficiency is greatly improved. Regarding this point, according to the results of an actual machine test conducted by the inventor, marble powder with an initial particle size of 1.19 to 1.41 mm was When crushed, the powder surface area per unit weight of the crushed product increased by 24%, and the particle size distribution was reduced to 14% by weight of particles of 500 μm or more.
A good result was obtained in which the amount of hot water was slightly reduced to 3.5%. Further, even in the test results in which the inclination angle of the inclined wall surface 1E was varied, almost the same effect was obtained over a fairly wide range of angles.

FIG. 4 shows a modification of the previous embodiment, in which each corner of the processing container 1 is constructed so as to be connected by an arcuate wall surface 1F. This example also achieved the same effect as the example shown in Figure 3, and the same test results as above showed that the powder surface area per unit weight increased by 25% compared to the one in Figure 1, and the particle size Particles larger than 500 μm decreased to 5.1% by weight. It has also been confirmed that the same effect can be obtained even if the radius of curvature of the arcuate wall surface 1F is varied over a wide range.

Next, a fifth example is a further development of the above example.
As shown in FIG. This embodiment is designed to prevent the formation of blind spots for the movement of the working piece 3 in the processing container as much as possible.
The shape of the processing container 1 is such that the cross-sectional shape along the circumferential movement path of the working piece 3 is a parallelogram or a rhombus, and each corner portion is formed into an arcuate wall surface as in FIG. Furthermore, the moving magnetic fields φ1 and φ2 of the linear motors 4 and 5 with respect to the processing container 1 are set so that the direction of the magnetic field movement is directed from the corner portion B where the internal angle of the processing container 1 forms an obtuse angle to the corner portion C where the internal angle forms an acute angle. There is. Therefore, even at the corner portion corresponding to section A in FIG.
Since the working piece 3 passes through the entire processing container evenly, the working piece 3 moves smoothly around the entire processing container, and the processing operation can be sufficiently carried out in every corner of the processing container. According to the test results conducted on the processing container shown in FIG. 5, the weight ratio of particles with a particle size of 500 μm or more contained in the crushed product is almost the same as in the previous example.
The surface area per unit weight is 37 compared to that in Figure 1.
%, and a significant improvement in the crushing effect was observed. In particular, in the embodiment shown in FIG. 6, the processing container is partitioned along the direction of the moving magnetic field and subdivided into a plurality of chambers, and each processing chamber 1' has the same working piece 3 as shown in FIG. As the circular movement is performed, the chances of collision between the object to be processed and the wall of the container increase accordingly, and more effective processing operations are performed.
Furthermore, it is also possible to simultaneously perform different processing in each processing chamber 1'.

As described above, according to the present invention, by making only slight changes to the shape of the processing container, the circular movement of the working piece within the container becomes much smoother than in the conventional square container, and the processing There is no blind spot at the corner for operation, and thus the objects to be treated in the container can be evenly treated with less power consumption, and the treatment efficiency can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a conventional moving magnetic field type processing device, Fig. 2 is a sectional view taken along the arrow in Fig. 1,
FIGS. 3 to 6 are schematic diagrams of different embodiments of the present invention. 1: Processing container, 1E: Inclined wall surface, 1F: Arc-shaped wall surface, 2: Processing object, 3: Working piece,
4, 5: Moving magnetic field generator, φ1, φ2: Moving magnetic field.

Claims (1)

[Claims] 1. A processing container containing a large number of working pieces made of magnetic material, and a pair of processing containers whose moving magnetic field directions are opposite to each other and which are placed oppositely on both sides of the container with the container in the center. The work piece, which is composed of a moving magnetic field generator, circulates within the processing container along the direction of the moving magnetic field using electromagnetic force based on the interaction with the moving magnetic field. In an electromagnetic processing device that performs processing operations such as crushing and mixing, the corners of the processing container along the circular motion path of the working piece are dropped, and the container walls at the corners are connected with an inclined or arcuate wall surface. A moving magnetic field type crushing, mixing, etc. processing device characterized by being configured. 2. In the processing apparatus according to claim 1, the cross-sectional shape of the processing container in a plane parallel to the circular movement path of the working piece is a parallelogram, and the moving direction of the moving magnetic field with respect to the processing container is set in the parallel plane. A moving magnetic field type crushing, mixing, etc. processing device characterized in that the angle is set from an obtuse corner to an acute corner of a quadrilateral.