JPS58210837A - Electromagnetic treating device for grinding, mixing, agitation or the like - Google Patents

Abstract

PURPOSE:To provide a titled treating device which improves the treatment performance for materials to be treated, by the constitution wherein the electricity to be supplied to a pair of shifting magnetic field generators in opposite directions provided with a treating device in-between is set at the frequencies differing from each other so as to eliminate the dead angle space in magnetic fields. CONSTITUTION:Electricity is supplied to a magnetic field generator 4 from a three- phase power source 9 through a frequency converter 10 such as a cycle converter or the like and the electricity is supplied directly to a magnetic field generator 5 in a device which subjects materials to be treated to grinding, mixing, agitation, etc. by contg. working pieces which are ferromagnetic or non-magnetic conductive materials and the materials to be treated such as solid, powder, liquid or the like in a treating vessel 1, and acting the shifting magnetic fields phi1, phi2 in opposite directions generated by a pair of the shifting magnetic field generators 4, 5 provided with said vessel in- between thereby inducing vigorous random motion in the working pieces. The formation of the dead angle spaces in the magnetic fields where the magnetic fields negate with each other in the vessel 1 is thus obviated and the interference of the motion of the working pieces is prevented.

Description

[Detailed description of the invention] This invention accommodates a workpiece such as a solid, powder, or liquid and a working piece made of ferromagnetic or non-magnetic ring material in a processing container. The present invention relates to an improvement in an electromagnetic processing device that processes objects to be processed, such as crushing, mixing, stirring, etc., by applying a moving magnetic field from the outside to cause a soaking piece to undergo violent undum movement.

In the head d-pi processing apparatus, processing of the object to be processed is performed by the movement of the working piece within the container or the collision with the soaking piece.

In order to carry out such processing efficiently, it is desirable that the working screws be uniformly affected by the moving magnetic field at all positions within the processing container and undergo violent random movements.

A device as shown in FIG. 1 has already been proposed as a processing device for this purpose. That is, in the first factor, 1 is a processing container that houses 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, and this container 1 is sandwiched in the center. Well,
Moving magnetic field generating devices 14 and 5 are disposed opposite to each other below that, and the moving direction of the generated magnetic field is indicated by the arrow ψ1. φ
As shown in 2, they are set in opposite directions. This moving magnetic field generator [4,5Fi] is also known as a so-called linear motor, in which, for example, electromagnetic force acts on the three-phase AC winding along the iron core, and the working piece 3t is rotated around its own center of gravity. ! In both cases, the moving magnetic field φ1. The transfer by φ2! In addition to the propulsion force in the direction of the magnetic field and the floating blade, 1. Collisions between the working pieces and the walls of the container also cause violent random interlocking in the container 1. Due to this random movement, the object 2 to be treated is pulverized, mixed, or agitated by collision with the working piece 3 or the like.

Here, the magnetic field distribution in the working space between the moving magnetic field generator [4 and 5] in which the container 1 of the apparatus shown in FIG. 1 is to be repaired is conceptually shown in FIG. 3. That is, in Fig. 3, 1. Moving magnetic field direction device [4, 5 is arrow φ1. In order to generate a moving magnetic field in the direction indicated by φ2, as shown in FIG.
Three-phase AC windings 8 indicated by U-X, V-Y, and W-Z are wound in the coil slot 7 of the iron core 6, for example, in a wave winding style.
The phase order is the same on the right in device 4 -Ll-%" -V
IUI -V-W'-u (u and u', v and v', w and w
' indicate coil conductors that are in phase and in opposite directions. )
In the blade device 5, move u-w+- to the right.
The windings are arranged like v-u+-w-v"-U.The pitch P of the windings (the distance between U-01 is 11 m) is the same for both. In FIG. The phase winding is located opposite to the U-phase winding of device 5, but in an actual processing device, it is difficult to tell which phase winding is facing the U-phase winding.
It does not affect its characteristics, etc. In addition, in Fig. 3, the moving magnetic field generators 4 and 5 are both receiving power from a power source with the same frequency, and the arrow H indicates the maximum current in the U-phase winding (the current is a sine wave). ) shows the magnetic field vector at each point. The ellipse A represents the locus of the magnetic field vector H at this point when the winding current changes for one cycle. That is, the magnetic field can be regarded as an elliptical rotating magnetic field that changes direction in the anti-ll-7 direction at most points in space.

Here, in FIG. 3, the U of the devices it4 and it5
Considering the magnetic field at each point on the straight line connecting the phase windings, we find that the magnetic field on this line is 2''-), and the magnetic field due to the same phase current flowing to the U phase winding is always 1 The absolute value of the magnetic field strength shows a small value throughout one cycle.At the center point on this straight line, 2
The magnetic fields caused by the two U-phase windings #VC completely cancel each other out, and the magnetic field always becomes zero over time. This situation is volume li! 11
The moving magnetic field generator with multi-pole winding f! [4,5
In vr-, the same phenomenon appears at all opposing line points of the in-phase windings U-υ and υ'-U1. on the other hand,
In FIG. 3, the magnetic field at a point on a line that is laterally moved by 1/2 of the pole pitch P from the opposing line of the winding U-υ is:

Contrary to the above, the magnetic fields are added to each other.

The absolute value of the magnetic field strength is thicker than at other points on the line.

In this way, when the pole pitch P1 of the excitation field generators 4 and 5 is equal to each other, the magnetic field in the r1 action space has an absolute value equal to 1 of the pole pitch P along the direction of the moving magnetic field.
It becomes a 1-minute accumulation so that the strength is alternated at intervals of /2. In addition, in FIG. 3, the case in which the U-phase windings of device 4.5 are opposed to each other is explained in particular, but this tendency is not observed in devices 4 and 5.
By tracking the relationship between the 1st winding's current and the magnetic field over time, it can be confirmed that this phenomenon always occurs even if the V-phase windings or the W-phase windings of 5 are opposed to each other. can.

First, to observe how the working piece moves in the magnetic field distribution mentioned above.

As shown in Fig. 1, a working piece 3 was placed in a container 1, and its movement was photographed using a high-speed camera. As a result, the following tendency was observed. That is, each spindle-shaped working piece 3 performs a rotation movement IIdJ around its center of gravity due to the rotating magnetic field in the working space, and as a whole, the moving magnetic field φ1. It moves along the direction of movement of ψ2. However, the range of movement in the direction of the moving magnetic field is mostly limited to the range of one pole pitch, and the overall 41 dJ path follows the path shown by arrow B in FIG. 3.

This is because, as mentioned earlier, in Fig. 3, the absolute value of the magnetic field is small on the opposing lines of windings U-U and [J'-[J', and working piece 3 crosses this area and increases the strength of the adjacent magnetic field. This is because the electromagnetic force that drives in the lateral direction up to the magnetic field area is overdue, and the movement of the working piece 3 is ultimately limited to circular movement within the range of the polar pinch P around the strong magnetic field area, and the movement within the processing vessel The magnetic field is weak between the strong magnetic field regions, thus creating a blind space where the movement of the working piece is weak. Moreover, since it is an electromagnetic processing device, due to the phenomenon described in Ail, the processing action such as crushing is not performed sufficiently at the point on the opposite line of volumes 1111ilv-U and U'-(J' in Fig. 3, and this causes the processing 2. This invention was made in consideration of the above points, and its purpose is to eliminate the drawbacks of the conventional equipment described above, and to reduce the amount of nitrogen in the processing container.
The object of the present invention is to improve the treatment performance of objects to be treated by moving the working piece randomly in one stroke without forming a blind spot of the magnetic field over the entire area.

According to this invention, the purpose of this invention is 8! This is achieved by setting the power supply frequencies a to a pair of moving S field generators placed in the same pair across the container to be disjoint frequencies.

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

In FIG. 4, the moving magnetic field generating devices 4 and 5 are each 3
A moving magnetic field φ1゜ψ is generated by receiving power from the power source 9. In this case, the power supply circuit of one of the devices 4 is equipped with a frequency converter such as an r-to-to-J converter. A device 10 is inserted to change the frequency of the power supply to the device 4 with respect to the frequency of the power source 9 to which the device i5 is directly supplied with power.

Now, the power supply frequency to device 4 is set to the power supply frequency ratio of 2 to device 5.
When set to double, the whole person's mVu is set to A6 in the action space inside the processing container. The field distribution will be described with reference to Figure 5. FIG. 5 is drawn in correspondence with FIG. 3, which shows the conventional magnetic field distribution where the feeding frequency is the same, and the winding arrangement is the same as that in Figure 2. 1 shows the state at the time when the currents flowing through the U-phase windings #M of devices 4 and 5 are both stopped or in the same negative direction and the instantaneous values of the currents are equal. The arrowheads in the figure represent the magnetic field vector locus at each point at this point in time.

As described in Figure 3, each circle in the cause of death represents a vector locus for one cycle of a sine wave current, but among these, the vector locus drawn as a bim circle is particularly Unworthy Alrt.

The vector locus represents a period in which the directions of current flowing through the windings of the same phase in L4 and L5 are both positive or negative, and during this period, the magnetic fields of L4 and L5 cancel each other out. Interfering 3. On the other hand, the great circle A'' represents a vector locus during a period in which the current directions are positive and opposite in the direction of the current, and in this case, the IC acts so that the magnetic fields strengthen each other.-t 'fC#c The vector trajectory at each point closest to the straight 5 is drawn as Issada circle A because this point is far away from the device 4 and changes at twice the frequency of the device 4. This shows that the influence and influence of the magnetic field is small, and the locus circle of vector H is only slightly deformed, but does not reach the point of becoming a double circle.

The 51st magnetic field distribution is shown in Figure 3.
Comparing nIy+-branch, windings -U-U and u'-u where the IK magnetic field is reduced to the lifting platform fed with the same frequency.
At the midpoint of the two opposite wires, as shown in Figure 5, since the frequencies of the two U-phase windings are different, the state of the magnetic field is equal to the 1-pass of both in one cycle of the rotating magnetic field. It is only for a moment that the waveforms intersect, and a rotating magnetic field whose magnitude always changes is formed.Also, even on a line moved laterally by 1/2 of the pole pitch from this line, the phase of the % magnetic field is Although it is different, the vector locus shape meter and the absolute value of the magnetic field are the same as on the winding U-U opposing line marked Ail, and the local strength of the magnetic field inside the processing container that is formed in the conventional method is eliminated, and the working There is no magnetic blind space that hinders the movement of the pieces.As a result, the working pieces can move sufficiently randomly in all parts of the processing container, improving processing performance such as pulverization, crushing, and mixing. I can do it.

Note that the power feeding frequency ratio to the % devices 4 and 5 is not limited to the illustrated example of 2=1, but the same effect can be obtained by setting it to an arbitrary ratio. In addition to the above-described setting of the oxygen supply frequency, the opposing moving magnetic field generator 11i! If the other pitches of t4 and t5 are set to be different from each other, a more -1- effect can be expected.

As described above, according to the present invention, the power supply frequencies to the opposing moving magnetic field generators are set to different frequencies, so that when power is supplied at the same frequency, the strength of the magnetic field inside the processing container is different. A magnetic field distribution in which the magnetic fields are generated alternately at intervals of 1/2 of the pole pitch is distributed evenly over the entire space in the container, and magnetic dead space that impedes the movement of the working piece is eliminated. In this case, sufficient processing operations such as crushing and mixing can be performed in the entire space inside the processing container, and the performance of the electromagnetic processing device can be improved.

[Brief explanation of the drawing]

Figure 1 is a principle diagram of the electromagnetic processing device that is the subject of this invention, Figure 2 is a winding diagram of the shifting magnetic field generator in Figure 1,
FIG. 3 is a conventional magnetic field distribution diagram in the working space, FIG. 4 is a power supply circuit diagram according to an embodiment of the present invention, and FIG. 5 is a magnetic field distribution diagram according to an embodiment of the present invention corresponding to FIG. DESCRIPTION OF SYMBOLS 1... Processing container, 2... Temporarily processed material, 3... Working piece, 4.5... Moving magnetic field generator, 8...
winding. 9...Power supply, 10...Frequency converter, φ1. ψ2・
...Moving magnetic field, H...Magnetic field vector.

Claims (1)

[Claims] 1) A processing container containing a soaking piece made of a ferromagnetic or non-magnetic conductive material, and a pair of moving magnetic field generators, each of which is a multi-phase device, are constructed, and the magnetic field generator is generated by supplying power to the moving magnetic field generators. In the processing apparatus for pulverizing, mixing, stirring, etc. a workpiece housed in a processing container by causing a random motion in a soaking piece using electromagnetic force based on the action of a moving magnetic field, the pair of moving magnetic field generating devices-
An electromagnetic grinding, mixing, stirring, etc. processing device characterized by setting the power supply frequencies of ＼ to different frequencies.