JPH0389931A - Mixer - Google Patents

Abstract

PURPOSE:To carry out mixing and milling of an object to be treated by instilling a cylinder in the inside of an inclining tank of a hollow cylinder and rotating the tank and the cylinder under the conditions of contacting each other and without sliding, using attracting power of a magnetic apparatus to the cylinder. CONSTITUTION:A tank 1 of a hollow cylinder made of a nonmagnetic and highly electrically resistant material is inclined, the outer circumference of the cylinder upper part is supported with a guide roller 30, an apparatus 19 to rotate the tank 1 through a tank bottom plate 3 from outside is installed, and an apparatus 17 to generate circular progressing magnetic field is installed along with the outer circumference of the lower part of the tank without a contact. A cylinder 10 for an object to be mixed is installed in the inside of the tank 1 without any mechanical bonds with the tank 1. The cylinder 10 is composed of an outer hollow cylinder made of a nonmagnetic and conductive metal and an inner hollow cylinder made of a nonmagnetic and highly electrically resistant material and a doughnut-type electromagnetic plate is set in the gap between both cylinders. The bottom plate of the cylinder 10 is made of a nonmagnetic material, a hole 14 for circulating the object is made in the center of the bottom plate, and a circular permanent magnet 43 is buried in the bottom plate so as to correspond to a permanent magnet 31 buried in the tank bottom plate.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a mixer for mixing liquids and liquids, liquids and powders, and for crushing and mixing powder and granules in liquids.

2. Conventional technology A conventional method of mixing objects by indirectly rotating a mixing cylinder inside the tank using a magnetic field device outside the tank is shown in FIGS. 1 to 8. 1 and 2 show a vertical type, FIGS. 3 and 4 show a horizontal type, FIGS. 5 and 6 show an inclined type, and FIGS. 7 and 8 show a rotating type. In both cases, the tank and magnetic field device are solid blue and are fixed, and the tank is also fixed except for rotation. The main purpose of all of these was to eliminate the power shaft used to drive the stirring type and achieve a perfect seal inside the tank. However, these methods have various problems that are difficult to solve.

FIGS. 11 and 12 are for explaining the above system and the basic operation of the present invention.

FIG. 11 is a plan view showing the operation of the cylinder 10 when the tank 1 is fixed and the magnetic field device 17 is fixed over the entire circumference of the tank. When the magnetic field device is excited to produce RM in the traveling direction of the magnetic field, the cylinder receives an attractive force and a rotational force through the tank wall due to the magnetic field device.
Rotates in the A force direction and revolves in the RB force direction, and the rotational movement time cylinder l
The locus drawn by the center Oc of O is CR. The plate part rotates and revolves while moving with the inner wall of the tank. In this case, the object 21 in the tank receives only the force of being pushed away by the tube and rotates with the tube, so the mixing effect is low.

Therefore, the first problem is that in order to increase the mixing effect, the cylinder should only rotate on its own axis with respect to the tank and not revolve around it.

In this space b, as shown in FIGS. 12 and 13, a magnetic field device 17 is provided.
Do not apply it all around the tank, but only in a certain area. That is, it is an arc-shaped magnetic field device. Then, the cylinder attempts to rotate only at a position roughly corresponding to the magnetic field device. The vertical type, horizontal type, and inclined type shown in FIGS. 113 to 6 are all equipped with an arc-shaped magnetic field device. In this case, the difference between the inner diameter of the tank and the outer diameter of the cylinder.

In other words, it has been experimentally confirmed that the mixing effect can be improved by having an appropriate gap between the two, and that the magnetic field device can be made more effective by making the cross section of the tank a little more oval than a perfect circle. . This is shown in FIG. Next, the second problem is wear due to sliding between the inner surface of the tank and the outer surface of the cylinder.
Also, wear debris may be mixed into the object. Magnetic field equipment N17
The forces acting on the cylinder 10 include suction force and rotational force.

Depending on the distance between the surface of the core of the magnetic field device and the surface of the magnetic material of the cylinder, that is, the size of the electromagnetic gap, the attractive force is generally one to several times larger than the rotational force.

Is it necessary to apply a large rotational force to the cylinder? If so, the suction force will also increase, and the force between the tank and the parts will increase, which will increase wear due to the movement.

One method to prevent this is to create serrations in the area where the outer periphery of the cylinder or the inner surface of the tank come into contact, thereby creating a thin film of the object between the cylinder and the seeds to prevent direct contact between the two. This is shown in FIGS. 14 to 17. One of the inclinations of the saw 1A20 (': 1 is determined by the flow direction RE of the object 5iJIJ21 with respect to the saw teeth. In FIGS. 15 and 16, the flow directions RD and RE of the object are the same direction. However, this thin film is The higher the viscosity of the object, the more likely it is to occur, and it is difficult to see unless the relative velocity of the object to the sawtooth is large.

However, in a mixer, the flow rate of the object is generally not very high. Another drawback is that this thin film is easily broken if the suction force is large. It is also possible to arrange permanent magnets in the circumferential direction of other parts and on the inner surface of the tank to prevent contact between the cylinder and the tank side by mutual repulsive force.Since the attractive force is strong, a large number of strong magnets are required.

Furthermore, the effectiveness is reduced due to the influence of magnetic flux from the magnetic field device, making it practically ineffective. In comparison, the contact between the cylinder bottom and the tank bottom is smaller than that of the cylinder [1
Flow 1~ in the C cylinder due to the weight of the body
Effective methods include attaching a serration to the inside of the tank bottom as shown in Figures 16 and 17, or attaching a permanent magnet to the blade blade and using its repulsive force to prevent mutual contact. .

7VA, the recessed tank type not shown in FIG. is intended to supply power through the slip ring device 18.

If the direction of rotation of the tank and the direction of rotation of the cylinder and their circumferential speeds are the same, then the cylinder revolves independently of the rotation of the tank, so there is no way to prevent sliding between the two, and the mixing effect cannot be improved. . Moreover, since the cylinder always only partially corresponds to the magnetic field device 17, the excitation flow of the magnetic field device 7M increases and the heat generation increases. Furthermore, even if the magnetic field device is made into a partial arc shape as shown by the dotted hatching, the magnetic field device itself rotates together with the tank, so the circumferential speed of the cylinder and the tank are the same, and the revolution speed of the cylinder is also the same. This is difficult and can result in the cylinder being out of correspondence with the magnetic field device. In such a case, the behavior of the cylinder becomes unstable and the mixing effect is extremely reduced.

As a common reference for each type) - In order to increase the rotational force of the cylinder, it is necessary to make the electromagnetic gap between the cylinder and the magnetic field device as small as possible, and the magnetic field device must be fixed and tightly attached to the tank. It is. For this reason, the heat generated by the magnetic field device is transmitted to the object through the tank wall, which is a major cause of an increase in the temperature of the object.

(1) As shown in FIGS. 9 and 10, the structure of a conventional cylinder is such that an inner cylinder 12 made of a magnetic material is fitted into an outer cylinder 11 made of a good electrical conductor by a method such as shrink fitting, and a bottom plate 15 or installed. The material of the magnetic inner cylinder 12 is a mild steel plate. This may be because it is easy to manufacture, or because it conforms to the configuration of the secondary side of a conventional induction type linear motor. This is the reason why this method is often used to configure the secondary side of induction type linear motors, and this method was adopted due to economic issues. However, mild steel not only generates heat due to hysteresis loss due to alternating magnetic field and eddy current loss, but also increases its own magnetic resistance due to the flow of eddy current.
The resulting decrease in the magnetic flux in the gap.

As a result, this leads to a decrease in the rotational force generated in the cylinder. The heat generated by the tube also causes the temperature of the object to rise.

111) - Is it desirable that the rotational force be large? The action of the suction force, which increases accordingly, has had the opposite effect.

I can't find a way to use that attraction.

It was unreasonable to take only measures to reduce the impact of the fire.

3. Problems to be Solved by the Invention The present invention attempts to solve the problem F with respect to the above-mentioned conventional technology.

1) Let the cylinder only rotate at a certain position.

2) Even if the cylinder and tank are in contact, they should not slide.

3) Create a structure that prevents the heat generated by the magnetic field device from being transmitted to the tank.

4) Create a structure that reduces loss generated in the magnetic body of the cylinder and allows the use of materials with low magnetic resistance.
Aims to increase rolling force.

5) Ensure that the effectiveness does not decrease even if the required rotational force for mixing objects is reduced.

4. Means for solving the problem 3-1) Means for 3-2) The tank is tilted and rotated by external power. Therefore, the tank is made into a perfectly round hollow cylinder. An arc-shaped magnetic field device is fixedly installed along the inclined lower tank wall of the tank without contacting the tank with a slight gap, so that it is not interfered with by the rotation of 46. The cylinder is not only rotated by a magnetic field device with the tank wall separated, but also controlled so that the tank and cylinder are in the same direction and at the same circumferential speed. For this purpose, speed detection devices for the tank and cylinder will be installed.

In this way, even if the tank is rotated, the cylinder will come into contact with the inner surface of the tank at a position corresponding to the magnetic field device, but it will not slide and its t-! It rotates while maintaining M. Even if there is a force that tries to make the cylinder revolve, this force moves the cylinder upward and is canceled out by the suction force.

There are two types of tanks: note-tan, which is a movement that involves biting an object between the parts;
Direct contact between the cylinders can also be avoided. Naturally, therefore, both wear and the contamination of wear pieces can be eliminated. That is, unlike conventional methods, suction power can be used without difficulty.

As for 3-3), since a spatial gap is created between the f-stage tank and the magnetic field device, heat conduction is much smaller than when the gap is small but they are in close contact with each other. Furthermore, passing cold air or cold water through this gap is effective in preventing heat conduction and cooling the tank body and magnetic field device.

3-4) Change the structure and material of the means cylinder. In other words, the outer cylinder is made of a good electrical conductor as before, or the inner cylinder is made of a non-magnetic, high electrical resistance material, with an appropriate gap created between the outer cylinder and the inner cylinder, in which a donut-shaped electromagnetic steel plate is laminated as a magnetic material. Or insert a ferrite core etc. This prevents the temperature of the object from rising by preventing heat generation and increase in magnetic resistance within the magnetic body, and also prevents a decrease in rotational force by preventing a decrease in magnetic flux in the gap. In other words, a mild steel plate is used as the magnetic body. Power efficiency can be significantly increased.

Means for 3-5) Since the Jffl body is rotated, the object flows in the same direction. Since the cylinder is also rotating in the same direction as the cypress, this has the effect of helping the cylinder rotate. Therefore, the rotational force required by the cylinder is less than when mixing is performed solely by the rotational force of the cylinder.
Moreover, since the cylinder and calibration do not move, power loss due to friction is also reduced.

5. Action The mixing action on the object of the present invention is shown in Figures 28 and 29.
This will be explained using figures.

Since the tank 1 is rotated by an external power, the object 21 inside the tank causes a rotational flow within the tank. In addition, this is facilitated by the cylinder's rotation, and the object inside the cylinder also causes a rotational flow. Both the tank and the cylinder are inclined, and the cylinder is also subjected to an attractive force by the magnetic field device 17, so although it comes into contact with the inner surface of the tank on the lower side of the slope, the circumferential speed of both is controlled to be the same. It doesn't move because it's on. Since both rotate so as to bite the object on their contact surfaces, the object is bitten during this period, and the direct contact between the cylinder and the tank is reduced. In addition, as the flow of the liquid in the cylinder and the calibrator approaches the vicinity where the gap between the cylinder and the calibrator begins to narrow, the C liquid level gradually rises and flows over the upper edge of the cylinder and into the cylinder. The object that has flowed into the cylinder gradually descends while creating a rotational flow and flows out of the bay through the bottom side hole of the cylinder due to centrifugal force. Since a gap is created between the bottom of the cylinder and the bottom of the tank, the object also flows out of the bay through the central hole of the bottom of the cylinder. There are fixed blades inside the outflow hole, and when the object is pushed out of the bay using this, the outflow pressure becomes a force pushing up the tube, and the rotation of the blades also increases the mixing effect. The solid line arrows in FIGS. 28 and 29 indicate the cylinder, and the two-dot dotted line arrows in the calibration area indicate the flow direction of the object in the cylinder. That is, the objects put into the tank circulate evenly throughout the cylinder without causing turbulence inside and outside the cylinder, so there is an effective mixing effect.

6. Example Embodiments of the present invention will be described with reference to FIGS. 18 to 27.

FIG. 18 is an overall vertical sectional view of the present invention. The tank 1 is a hollow cylinder with a perfect circular cross section, and the cylindrical portion 2° and the bottom plate 3 of the tank are made of a non-magnetic and high electrical resistance material 1, such as SO3. The lid 5 does not necessarily have to be subject to such restrictions. The tank 1 is supported by guide rollers 30 at the top of the tank at an angle of θ with respect to the horizontal, and the bottom plate 3 is connected to a rotation device 19 of the tank. Guide roller-3
The Q rotation device 19 is fixed to a separate stand (not shown).

The rotation device 19 has a tank rotation speed detector 33 . M5
shall be of a type that can be opened and closed with a pinch at one end. A short pipe 6 for sucking air or gas into the tank, and an on-off valve 34 and a rotary socket are attached to the raw material input lower, an internal inspection window 8, and the center thereof. Additionally, a heat vibrator 37 and a fin 38 for controlling the temperature of the object are attached. It is also possible to attach a tubular heater. An object discharge port and opening/closing valve 4 are installed at one corner of the tank bottom plate 3.

In addition, a ring-shaped permanent magnet 31 is buried in the tank bottom plate to correspond to the ring-shaped permanent magnet 43 buried in the cylinder bottom plate 15, and a gap is created between the cylinder bottom and the tank bottom using the repulsive force between the two. This creates a circulation path for objects. In addition, the non-magnetic inside the tank,
Free to coat with wear-resistant material.

A cylindrical rotation speed detector 32 is mounted on a separate stand (not shown) outside the cylindrical portion 2 of the tank in a non-contact manner with the cylindrical portion. An arc-shaped traveling magnetic field generator 17 is placed on the lower side of the inclined surface of the tank at an appropriate angle along the outer periphery of the tank, with a slight gap d between the tank and the tank. ). This magnetic field device rotates the cylinder 10 in the tank twice by attracting it across the tank wall.It is excited by multiphase alternating current, and the traveling direction of the magnetic field is the same as the rotation of the tank, and the circumferential speed of the cylinder is different from the circumference of the tank. It is controlled to be the same as the speed. The magnetic field device is a cooling fan 36
A ventilation fan 36-2 is provided to the gap d between the tank and the tank. If the magnetic field device is waterproof, you can use cold water instead of cold air. The fan 36-3 is for cooling the fin 38 of the pipe to the heater 1.

In addition to this, it is also free to install a device M (not shown) for adjusting the inclination angle O of the tank. FIG. 19 is a plan view of the lid 5,
Figure 0 is an x5-YS sectional view of Figure 18, Figure 21 is a cross-sectional view of Figure 18.
%-Y6 sectional view in the figure, Figure 22 is X7-Y7 in Figure 18
It is an arrow view, ie, a top view of a tank bottom plate.

Arrow A indicates the upper surface of the tank slope, and arrow B indicates the direction of the lower surface.

One cylinder 10 is placed in the tank, and the cylinder is in a free state without being mechanically connected to the tank. The size of the cylinder is such that its outside diameter is smaller than the inside diameter of the tank and there is an appropriate gap D between it and the sloping top surface of the sowing seeds placed in the tank.
(approximately 9 of the outer diameter of the bay). Although its height is naturally shorter than the depth of the tank, it is sufficient as long as it has a suitable distance from the cylinder at the top of the tank.

Next, the structure of the tube 10 is shown in FIGS. 23 to 26.

FIG. 23 is a longitudinal sectional view of the entire cylinder. The cylinder IO has a cylindrical portion consisting of a hollow cylindrical outer cylinder 11 made of a good electrical conductor and a hollow cylindrical inner cylinder 40 made of a non-magnetic and high electrical resistance material.
A suitable gap is created between the cylinders, and donut-shaped electromagnetic steel plates are laminated in that area 41. Alternatively, the doughnut-shaped Ferrai 1-core is inserted, sandwiched, and tightened from both the upper and lower surfaces. The figure shown is an example of using laminated electromagnetic steel sheets. Thickness of outer cylinder, tt, n of magnetic steel plate]
etc. are determined by electromagnetic factors. The laminated thickness h of the electromagnetic steel sheets is approximately the same as the laminated thickness of the core of the magnetic field device 17. A plurality of side holes 13 for object circulation are provided at the bottom of the cylindrical part. Although the negative side of the cylinder is open, there is a bottom plate 15 made of non-magnetic material with a hole 14 for object circulation in its center. Inside the hole 14 is a fixed wing 4 having a thickness that does not protrude beyond the thickness of the bottom plate.
There are 4. This serves to promote the discharge of the object in the cylinder and to assist the mixing effect, but if an m-cone-shaped object is to be mixed into the object, it is better not to add wings.

Further, a ring-shaped permanent magnet 43 is embedded in the bottom plate so as to correspond to the ring-shaped permanent magnet 31 in the tank bottom plate 3 to generate a repulsive force. When the tube is placed in the tank, the portion 41 of the laminated electromagnetic steel sheet of the tube is made to correspond to the core of the magnetic field device 17. If the center of the magnetic material in the cylinder, that is, the center in the thickness direction of the laminated electromagnetic steel plate, is shifted slightly below the center of the magnetic field device so that the electromagnetic center lines of both sides are shifted, the cylinder will receive an upward force. It is also possible to prevent contact between the tank bottom and the cylinder bottom by applying an upward force to the cylinder, such as by cutting a skew groove in the outer cylinder of the cylinder so as to generate an upward force. In addition, the inner and outer surfaces of the cylinder are made of non-magnetic, wear-resistant material.

7. Effects of the invention Utilizing the attractive force of the magnetic field device on the tube, which was an obstacle in the prior art, the cypress and the tube can be rotated in a state of contact without any movement, thereby creating a mixing effect on the object. It is expected that it will have a crushing effect. That is, the energy received by the cylinder from the magnetic field device can be effectively utilized to increase the efficiency of the suspension.

In addition, since there is no power shaft penetrating the tank wall, sealing is easy and complete, and the cylinder can be easily taken out when the lid is opened, making it easy to clean the inside of the tank and the cylinder. In addition, if you remove the fixed blade in the circulation hole of the cylinder bottom plate and use it to mix fibrous materials, you can mix it without cutting the fibrous raw material 4 since there is no B joint blade, baffle plate, etc. It also has a soothing effect.

[Brief explanation of drawings]

Fig. 1 Longitudinal cross-sectional view of a conventional vertical mixer Fig. 2 A view taken along arrows Xl-Y'l in Fig. 1 Fig. 3 A longitudinal cross-sectional view of a conventional horizontal mixer ff14[] :] Fig. 53 X2- Y2 cut-away ini diagram Figure 5 Longitudinal cross-sectional view of a conventional tilting type mixer Figure 6 X3-Y3 arrow view in Figure 285 Figure 7 Longitudinal cross-sectional view of a conventional tank rotary type mixer Figure 8
Figure 9, a view taken from the X4-1 arrow in the diagram; Figure 10, a plan view of the conventional part;
Figure 13 An explanatory diagram of the operation of the cylinder in the case of an arc-shaped magnetic field device Figure 14 A diagram of the arrangement of the tank, magnetic field device, and cylinder in a conventional mixer Figure 14 Diagram showing saw teeth on the outside surface Inside the tank Fig. 16 shows the sawtooth arrangement on the side surface Fig. 17 shows the arrangement of the serrations on the bottom of the tank Fig. 18 shows the side view of Fig. 816 Fig. 19 shows a longitudinal section of the entire structure of the present invention Fig. 20 shows the top view of the lid Fig. 18 shows X5- ＼Cross section same as Fig. 2 2 x6Y6 sectional view of Fig. 18 Fig. 22 Figure 26 Plan view of donut-shaped electromagnetic steel sheets Figure 27 Lamination of donut-shaped electromagnetic steel sheets Figure 27 Control system diagram l...Tan body 2...Tan side wall 3-Tan bottom plate 4...Discharge port and opening On-off valve 5 - Tank lid 6 - M pipe 7 for intake or gas pressure inlet - Raw material input port 8 - Internal inspection window 9 - Baffle valve - To IO... Mixing tube Main body 11... Outer cylinder 12... Inner cylinder 0 13 Part side hole 14... - Cylinder bottom plate hole 15... Cylinder bottom plate 16... Airfoil bar for cylinder connection 17... Magnetic field device 18. - Slip ring device 19 - Tank rotation device 20... Sawtooth ○V - Tank center Oc... - Cylinder center 21 - Target object 22... 23... CR... Cylinder revolution Locus RA...Direction of rotation of the tube RB--Direction of revolution of the tube RC...Rotation direction of the tank RM...Direction of movement of the traveling magnetic field RD...Direction of flow of the object relative to the tank RE... Flow direction of the object relative to the cylinder 30...Support roller 31--Repulsion ring-shaped permanent magnet 32--vi rotation speed detector 33--Tank rotation speed detector 34--Opening/closing valve 35... [i!1 turn socket 36-1 Recirculation fan 36-2 Horn 36-3 Horn 37-・Heat pipe 38...Heat pipe radiation fin 39...40...Non-magnetic inner cylinder 41...-1h Scrap electrical steel sheet or Ferrai 1~Core 42・
・・Permanent magnet for transmitting cylinder rotation speed signal 43 ・・・Ring-shaped permanent magnet for repulsion 44 ・・Fixed type in bottom plate hole 45 ・・Ring-shaped lid 46 ・・Laminated electromagnetic steel plate holding material 47 ・・・− Signal line 48 --- Control device 49 --- Power line D -- Tank, maximum gap between parts d -- -- Tank, magnetic field'! Gap between A and A → A Upper direction of tank slope → B Lower side of tank slope

Claims (1)

[Claims] 1. A tank in which a hollow cylindrical mixing tank body (hereinafter referred to as tank) having a bottom made of a non-magnetic material with high electrical resistance and moderate strength and an openable/closable lid (hereinafter referred to as tank) is tilted. A device that rotates the tank from outside the tank is attached to the tank bottom plate with the upper outer periphery supported by guide rollers, and an arc-shaped traveling magnetic field generating device (hereinafter referred to as magnetic field device) along the outer periphery of the tank is attached to the lower side of the slope of the tank. installed without contact with the tank. A ring-shaped permanent magnet is embedded inside the bottom plate of the tank, and a mixed object (hereinafter referred to as object) outlet and an on-off valve for the same are provided in one corner of the bottom. The lid of the tank has a raw material inlet, an inspection window, a short pipe in the center for connecting to an external vacuum pump, etc., and an on-off valve and a rotating socket attached to it. A mixing machine characterized in that a rotation speed detector for a mixing cylinder inside the tank is installed outside the tank without contacting the tank, and a rotation speed detector for the tank is also installed in the tank rotating device. 2. A mixing cylinder (hereinafter referred to as a cylinder) for mixing the objects in a free state without mechanical connection to the tank is placed in the tank. The tube is a hollow cylinder with an outer diameter smaller than the inner diameter of the tank, a length shorter than the depth of the tank, and an open top and bottom plate. The structure of the cylinder is a hollow metal cylinder with a non-magnetic outer surface and a good electrical conductor (hereinafter referred to as the outer cylinder).
, a hollow cylinder (hereinafter referred to as the inner cylinder) made of non-magnetic, high electrical resistance material on the inside, with a double structure with a necessary gap between the two cylinders, and a donut-shaped electromagnetic steel sheet laminated in the gap, or Or insert the same donut-shaped ferrite core. Its stacking thickness is approximately the same as the stacking thickness of the core of the magnetic field device, and its mounting position is set to correspond to the magnetic field device. Multiple holes are provided at the bottom of the cylindrical part for object circulation, and multiple permanent magnets are buried in a row along the circumference at the top of the outer cylinder, which corresponds to the cylinder rotation speed detector outside the tank. I'll do what I do. The bottom plate of the cylinder is made of a non-magnetic material, and a hole for object circulation is bored in the center of the bottom plate, and a fixed wing is installed in the hole so that it does not extend beyond the thickness of the bottom plate. In addition, a ring-shaped permanent magnet is embedded in the bottom plate so as to correspond to the ring-shaped permanent magnet embedded in the tank bottom plate. A mixer according to claim 1, characterized in that the tank has a cylinder as described above. 3. The magnetic field device is installed with a narrow gap between the tank and the tank so that it does not make contact with the tank and does not interfere with the rotation of the tank, and generates a traveling magnetic field by excitation with multiphase alternating current, which attracts the tube inside the tank. Let it rotate. Claim 1 further includes a control device for making the circumferential speeds of the contact surfaces between the tank and the cylinder the same in response to signals from the rotational speed detectors of the tank and the cylinder. mixer.