JPS628221B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention accommodates a working piece made of ferromagnetic or non-magnetic conductive material together with a workpiece such as solid, powder, or liquid in a processing container, and The present invention relates to an improvement in an electromagnetic processing device that processes objects to be processed, such as crushing, mixing, and stirring, by causing a working piece to undergo intense random motion by applying a moving magnetic field.

As this type of processing apparatus, apparatuses as shown in FIGS. 1 and 2 have already been proposed. That is, in FIG. 1, reference numeral 1 denotes a processing container containing a number of working pieces 3 made of ferromagnetic or non-magnetic conductive material, for example, in the shape of a spindle, together with an object 2 to be processed. Moving magnetic field generators 4 and 5 are arranged above and below to face each other, and the moving direction of the generated magnetic field is indicated by the arrow φ ₁ ,
As shown by φ ₂ , they are set in opposite directions.
These moving magnetic field generating devices 4 and 5 are well known as so-called linear motors (hereinafter, the “moving magnetic field generating device” will be referred to as “linear motor”). It is configured by being wound to form multiple poles, and receives power from a multiphase AC power source to generate moving magnetic fields φ ₁ and φ ₂ .

With the configuration shown in Fig. 1, the working piece 3 placed in a magnetic field in which the moving magnetic fields φ ₁ and φ ₂ act is subjected to electromagnetic force due to the action of magnetization and eddy current, and the working piece 3 moves around its own center of gravity. In addition to the propulsive force and levitation force generated by the moving magnetic fields φ ₁ and φ ₂ in the direction of the moving magnetic field, collisions between the working pieces and the wall of the container are also added. 1 causes intense random motion. Due to this random movement, the workpiece 2 is moved to the working piece 3.
Crushing, mixing, and agitation progress due to collisions with other materials.

By the way, according to an analysis of the distribution of magnetic field strength in the magnetic field space between the linear motors 4 and 5 in which the processing container 1 is placed, it is clear that the magnetic field distribution is as shown in FIG. It became. Here, the linear motors 4 and 5 are U, V,
It is assumed that a W3-phase AC winding is provided, and both are excited by an AC power source of the same frequency. In other words, the pole pitch of the winding 6 wound around the iron core 7 is P.
If this is the case, the magnetic field in the working space inside the processing container is stable, regardless of the passage of time, and its absolute value repeatedly changes from strong to weak at intervals of 1/2 of the pole pitch P along the direction of the moving magnetic field. The distribution is as follows. Such a magnetic field distribution is obtained by tracking the relationship between the winding currents of each phase of the linear motors 4 and 5 and the magnetic fields generated thereby as time progresses. The distribution also matches the actually measured magnetic field distribution. Here, if the center of the strong magnetic field region is represented by A and the center of the weak magnetic field region is represented by B, then A and B are arranged alternately at 1/2 pole pitch intervals along the direction of the moving magnetic field.

In addition, when observing the movement of the working piece inside the processing container under the above magnetic field distribution with a high-speed camera, it is found that the working piece moves violently and randomly in the strong magnetic field region, but in the weak magnetic field region, the working piece moves slowly. It was observed that it was slowing down. This observation result also applies to the actual pulverization process of crushed materials, and the actual machine operation test also shows that the pulverization operation does not progress sufficiently in the four corners of the processing container 1 located in the weak magnetic field region, and It is observed that a large amount of crushed material with large particle size remains as it is. In other words, in this type of processing apparatus shown in Fig. 1, at first glance it appears as if the processing operation is performed uniformly throughout the processing container, but if we consider it strictly, there is a steady state inside the processing container. It has become clear that the magnetic field strength is weak, and as a result, there is a partial inactive space in which the working piece does not move actively.

On the other hand, during the processing operation of the above-mentioned apparatus, in addition to violent collisions and rubbing between the working piece and the material to be processed, such as crushed material, inside the processing container, repeated collisions and rubbing occur with the container. It has been recognized that frictional heat generated by this operation significantly increases the temperature of the processing container itself and its internal temperature. For this purpose, thermal deformation of the processing container,
There is a risk that the service life will be shortened, and the material to be crushed,
Depending on the type of material to be mixed, there may be changes in quality when exposed to high temperatures. In such cases, assist in heat dissipation in the processing container and its interior as much as possible to suppress excessive temperature rises. This is necessary. In this regard, conventional equipment generally uses a blower or the like to forcefully send cooling air to the surrounding area of the processing container to achieve cooling, but even if this method can sufficiently cool the processing container, the Since the workpieces housed inside cannot be cooled sufficiently, an improvement in this respect is desired. On the other hand, as a special case, it may be preferable to stir different types of liquids at high temperatures.
This case has been dealt with by blowing hot air around the processing container, but it is difficult to apply sufficient heat to the central area within the processing container.

This invention was made in consideration of the above points, and its purpose is to effectively cool the working space in the processing container or heat it as necessary, without substantially impairing processing performance such as crushing and mixing. The object of the present invention is to provide an electromagnetic grinding, mixing, etc. processing device that can perform the following operations.

According to the present invention, each of the weak magnetic field areas that are constantly generated in the processing container corresponding to the pole pitch spacing of the moving magnetic field generator is installed as a double partition wall that partitions the inside of the container. This is accomplished by defining a cooling or heating fluid flow path across the processing vessel between the walls of the double partition.

The present invention will be described in detail below based on illustrated embodiments.

First, in FIGS. 4 and 5, the symbols U, V, W,
U′, V′, and W′ represent the current direction and phase sequence of the three-phase AC winding. In region B, where the windings of the same phase face each other at the top and bottom, the magnetic fields of the linear motors 4 and 5 act to cancel each other out, so a steady weak magnetic field region is created in this region as described in Fig. 3. arise. Further, this weak magnetic field region is generated at each interval of the pole pitch P of the linear motor. By the way, according to the present invention, a double partition wall 8A is positioned so as to occupy the above-mentioned weak magnetic field region and divide the inside of the processing container 1 along the moving magnetic field directions φ ₁ and φ ₂ in this portion. and 8B, and a ventilation passage 9 having a cross-sectional width d that crosses the interior of the container 1 is defined between the double partitions 8A and 8B.
Then, cooling air as a cooling medium is forcedly blown from the side by a blower 10 as shown in FIG. 5, and the heat generated inside the processing container is efficiently removed. Further, in the case of special processing, when it is necessary to maintain the working space inside the processing container 1 at a high temperature, hot air may be sent instead of the cooling air described above. Note that the cooling and heating medium is not limited to gas, and may be liquid. In this case, an external heat medium liquid line is connected to the passage 9. Further, by providing fins on the partition walls 8A and 8B facing the passage 9, the heat exchange efficiency can be further improved. Moreover, since the partition wall 8 of the double-walled structure is provided in the weak magnetic field area B, that is, in the non-operating space where processing operations such as crushing and mixing hardly work effectively, the processing operations and performance may be impaired in the slightest. In addition, in the case of pulverization processing, the working space of the processing chamber divided by partition walls becomes a strong magnetic field area, so there is no possibility of unpulverized material stagnating in the four corners of the room. ,
The advantage of further performance improvement can be obtained.

Next, an applied example of the above embodiment is shown in FIG.
In this embodiment, a plurality of independent box-shaped processing containers 1' each having a dimension slightly shorter than the pole pitch P of the linear motors 4, 5 are spaced apart from each other by a distance d along the linear motors 4, 5. The containers 1' are arranged side by side, and each container 1' is connected between non-magnetic connecting plates 11 and 12 arranged above and below, and the adjacent containers 1' and the upper and lower connecting plates 11 and 12 are connected to each other. A space with a cross-sectional width d surrounded by is determined to correspond to a stationary weak magnetic field region B in the magnetic field space between the linear motors 4 and 5. The space 9' defined between the containers is used as a cooling or heating medium flow path.

As described above, the present invention utilizes the non-operating space in the weak magnetic field region, which conventionally does not work effectively for processing operations, and provides a cooling or heating medium flow path that penetrates the container. Therefore, a practical effect can be obtained in which effective cooling or heating of the internal space of the processing container can be easily achieved without impairing the processing performance.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the configuration principle of a conventional electromagnetic processing device, Fig. 2 is a sectional view taken in the direction of the arrow in Fig. 1, and Fig.
The figure is a magnetic field distribution diagram schematically representing the distribution of the magnetic field strength inside the processing container in FIG. 1, FIG. 6 is a cross-sectional view showing the structure of a processing container of an embodiment different from that shown in FIG. 4. 1... Processing container, 2... Processing object, 3... Working piece, 4, 5... Moving magnetic field generator, 8
...Double partition wall, 9, 9'...Cooling and heating medium flow path, φ ₁ , φ ₂ ...Movement direction of moving magnetic field, P...
...Pole pitch, A...Strong magnetic field region, B...Weak magnetic field region.

Claims (1)

[Claims] 1 A processing container containing a large number of working pieces made of magnetic or non-magnetic conductive material, and a processing container placed oppositely on both sides of the processing container with the processing container in the center, the moving directions of the magnetic fields being opposite to each other. Consisting of a pair of moving magnetic field generators, the random movement of the working piece generated in the processing container by electromagnetic force based on the interaction with the moving magnetic field performs processing such as crushing and mixing of the processed material contained in the processing container. In the case where a double partition wall is installed to partition the inside of the container as an installation location in each weak magnetic field area that is constantly generated in the processing container corresponding to the pole pitch spacing of the moving magnetic field generator, this double partition 1. An electromagnetic pulverizing, mixing, etc. processing device characterized by defining a cooling or heating body flow passage across a processing container between walls.