JP3213013B2 - Mixed granulation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing and granulating apparatus for mixing and granulating ceramic raw materials or semi-finished products thereof by using a stirring granulation type mixing granulator.

[0002]

2. Description of the Related Art Conventionally, in order to produce ceramics such as hard ferrite, a ceramic raw material or a powder of a semi-finished product thereof is granulated by using a mixing granulator of a stirring and mixing type, and a few mm
A mixed granulated material of about ~ several cm is made. Here, as an agitation-type mixing granulator, for example, an Erich-type countercurrent high-speed mixer (trade name) is known, and a pan (rotating container) in which ingredients are rotated in a clockwise direction, and a pan in the pan rotates. A first stirring tool, called a mixing star, mounted eccentrically with respect to the center, rotates in the opposite direction to the pan to stir the ingredients inside the pan evenly. In addition, a second stirring tool that rotates at high speed (counterclockwise rotation) called a high-speed agitator is provided, and the mixing effect is improved by scattering and flowing the raw material.

[0003]

By the way, when a powder of ceramic raw material or semi-finished product is put into a pan of a stirring and mixing type mixing granulator and a liquid such as water is added thereto to obtain a mixed granulated product, The amount of the liquid to be added to the powder is delicately adjusted, and if the ratio of the liquid is too large or too small, it is not possible to obtain a mixed granulated product having a uniform particle size and a high density. For this reason, a skilled worker monitors the mixing state, and appropriately adjusts the amount of the liquid or the amount of the powder to obtain a granulation nucleus in a good state with an appropriate particle size to be the core of the mixed granulated material. Was like that. As described above, in the conventional case, there is a problem that it is necessary to rely on the skilled experience of the operator, and when the liquid supply of the operator is improperly adjusted, the granulation may have to be performed again. .

[0004] The present inventor has found that the fluidity (or viscosity) of the material in a pan provided in a stirring and mixing type mixing granulator is related to the quality of the granulation nuclei.

SUMMARY OF THE INVENTION In view of the above, the present invention is to automatically obtain a mixed granulated product having a uniform particle size and density by controlling the granulating conditions while paying attention to the fluidity of the material in the bread. It is an object of the present invention to provide a mixing and granulating apparatus which makes possible.

[0006]

Means for Solving the Problems To achieve the above object, a mixing and granulating apparatus of the present invention comprises a rotating container and a rotating container in the container.
A rotating tool that rotates, and a first motor that rotationally drives the rotating container.
Motor and a second motor for rotatingly driving the rotary tool
Liquid to the powder of ceramic raw material or semi-finished product
And stirring and mixing type mixing granulator mixing granulated by adding the body, before
Detecting means for detecting the fluidity of the material in the rotating container;
Open and close the liquid supply pipe for supplying liquid into the rotating container
Opening / closing valve, and an exhaust means for exhausting air from the rotating container.
Receiving a stage, the detection output of said detection means, said detection output flow
Opening the on-off valve when excessive dynamic is detected, the detection output
When the fluidity is too low, the exhaust means is activated.
And control means .

[0007]

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

According to the present invention, the flowability (or viscosity) of the raw material placed in the rotary container of the stirring and mixing type mixing granulator is detected by focusing on the fluidity (or viscosity) of the raw material. It is determined that a good granulation nucleus is obtained if the detection result of the fluidity is within an appropriate range during the operation period for producing the granule nucleus, and the granulation operation of the mixing granulator is continued as it is. A granulation nucleus is formed, and then the number of revolutions is reduced to grow the granulation nucleus, thereby finally producing a mixed granule of several mm to several cm. If the detection result of the fluidity is outside the appropriate range and indicates excessive fluidity,
The viscosity of the raw material in the rotating container is insufficient, and the material is in a dry state (insufficient amount of liquid) .Therefore, a granulation operation is performed by adding liquid such as water to the rotating container so that an appropriate granulation nucleus can be obtained. I do. In addition, when the detection result of the fluidity is out of the proper range and indicates the fluidity is too small, the raw material is sticky and the viscosity is too large (the liquid amount is too large). Remove the water in the container and lower the temperature in the container (replace the air in the container with the outside air to lower the temperature in the container) and perform the granulation operation to obtain good granulation nuclei. to.

Further, the detection of the fluidity may be performed by focusing on the electric power or current value of a motor for driving the rotary container or the stirring tool. That is, it is determined that a good granulation nucleus can be obtained if the power or current value is within an appropriate range during an operation period for creating a granulation nucleus of the mixed granulator, A granulation nucleus is produced by continuing the granulation operation as it is, and then the number of revolutions is reduced to grow the granulation nucleus, thereby finally producing a mixed granule of several mm to several cm. If the power or current value is smaller than the appropriate range, the raw material in the rotating container is insufficiently sticky and is in a dry state (insufficient amount of liquid). Therefore, a liquid such as water is added to the rotating container to granulate. Operate to obtain an appropriate granulation nucleus. Further, when the power or current value is larger than the appropriate range, the raw material is in a sticky state (excess liquid amount), so that the inside of the container is removed by exhausting the inside of the rotating container to remove moisture in the container. The granulation operation is performed by lowering the temperature (the temperature in the container is reduced by replacing the air in the container with the outside air) so that a good granulation nucleus can be obtained .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mixing granulator according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an Erich-backflow type high-speed mixer as a mixing and mixing type granulator;
A pan (rotary container) 3 is rotatably supported on the top, and has a structure in which the pan 3 is substantially sealed with a lid 3A.
The first stirrer that mixes the raw material in the pan (ceramic raw material for producing hard ferrite or semi-finished product with water) at a position eccentric to the center of rotation of the pan by horizontal and vertical flow evenly And a high-speed agitator 5 as a second stirring tool for scattering and flowing the raw material by high-speed rotation to improve the mixing effect. A pan driving motor 7 is attached to a frame 6 integrated with the base 2, and the rotational driving force of the motor 7 is a gear 8 attached to a motor rotating shaft.
The gear 9 meshes with the gear 9, the gear 10 rotates integrally with the gear 9, and the gear 11 meshes with the gear 9 and is transmitted to the pan 3 via a gear 11 fixed to the bottom of the pan, and the pan 3 rotates, for example, clockwise. The mixing star 4 receives the rotational driving force of the motor 7 through the paths of the gears 8, 9, 12 and 13, and rotates in the opposite direction to the pan 3, that is, in the counterclockwise direction. A high-speed agitator driving motor 15 is attached to the frame 6 fixed to the base 2, and the rotating shaft of the motor 15 and the rotating shaft of the high-speed agitator 5 are connected by a winding transmission mechanism using a V-belt 16. Have been.

The upper portion of the pan 3 is substantially sealed by a lid 3A fixed to the frame 6 side.
A water supply pipe 18 and an exhaust duct 19 are provided so as to penetrate A, an electromagnetic on-off valve 20 is inserted into the water supply pipe 18, and a blower 21 as an exhaust means is provided in the exhaust duct 19. A temperature detector 22 for measuring the temperature in the pan 3 is provided below the lid 3A. A power or current detector 24 for detecting the power or current value of the agitator drive motor 15 is provided, and a detection output of the detector 24 is supplied to a control unit 23 and an output of the temperature detector 22 is also provided. It is added to the control unit 23.
The control unit 23 determines the high-speed mixer based on the relationship between the time after the ceramic raw material or its semi-finished product is put in the pan 3 and the operation of the Erich-backflow high-speed mixer is started and the power or current value of the detector 24. Judgment of whether granulation nuclei in a good state with proper particle size as seeds to produce final mixed granulated material of several mm to several cm by granulation operation can be obtained by continuing the operation as it is Is what you do. Then, the control unit 23 continues the granulation operation in the current state according to the determination result, or opens the electromagnetic on-off valve 20 and additionally supplies water into the pan 3 from the water supply pipe 18 to perform granulation. By performing the operation, or by operating the blower 21 in the middle of the exhaust duct 19, the moisture in the pan 3 is removed, and the air in the pan is replaced with the outside air to lower the temperature to perform the granulation operation. .

FIG. 2 shows a state in which the ceramic raw material powder is placed in a pan in a state where the Erich-type high-speed mixer is completely dried (absolutely dry state), the operation is started, and 11% by weight of water is added during the operation. , The high-speed agitator rotation speed, the high-speed agitator load (power consumption of the agitator driving motor: kW), and the pan load (the current of the pan driving motor: A) when is continued. In the operation of this Erich-backflow type high-speed mixer, a high-speed agitator is driven at approximately 1200 rpm for about 30 minutes from the start of operation to produce granulation nuclei serving as seeds of the mixed granules, and thereafter the high-speed agitator rotation speed is reduced. It is performed so as to produce a larger mixed granulated material having a final size of several mm to several cm from the granulation nucleus. However, in the case of FIG. 2, after about 30 minutes had elapsed, the inside of the bread was in a powdery and smooth state and no granulation nuclei were formed. At this time, the agitator load, that is, the power consumption of the agitator driving motor is less than 10 kW because the driving torque is small (11 kW to 1 kW).
(Below the 4 kW proper range) and the pan load or current of the pan drive motor was below 25A.

FIG. 3 shows that the Eirich reverse flow type high-speed mixer was dried for 5 minutes, left for 1 hour, and the ceramic raw material powder was added thereto. The operation was started, and 11.5% by weight of water was added on the way to continue the operation. High-speed agitator rotation speed and high-speed agitator load (power consumption of agitator drive motor: k
W) and pan load (current of the pan driving motor: A). In the case of FIG. 3, a good granulation nucleus with an appropriate particle size is obtained, and the power consumption of the motor for driving the agitator is within an appropriate range of 11 kW to 14 kW. In this case, a proper granulation nucleus can be obtained after about 30 minutes of operation.Therefore, by lowering the rotation speed of the agitator and continuing granulation as it is, a mixed granulated product of several mm to several cm is finally obtained. Will be able to The pan load, that is, the current of the pan drive motor is within an appropriate range of 25 to 26.5 A.

FIG. 4 shows the operation of the high-speed agitator rotating when the ceramic raw material powder is immediately put into operation and the operation is continued while adding 11.5% by weight of water on the way, after drying the Erich-type high-speed reverse mixer for 5 minutes. The numbers and the high-speed agitator load (power consumption of the agitator driving motor: kW) and pan load (current of the pan driving motor: A) are shown. In this case, the granulation nuclei are formed but are sticky and defective granulation nuclei, and the driving torque of the agitator driving motor is required to be large, so that the power consumption exceeds the appropriate range of 11 kW to 14 kW. In this case, even if the number of rotations of the agitator is decreased and the granulation is continued as it is, a preferable mixed granulated product is not produced. Note that the pan load, that is, the current of the pan drive motor exceeds the appropriate range of 25 to 26.5 A.

From the experimental results shown in FIGS. 2 to 4, attention is paid to the power consumption (or current value) of the motor 15 for driving the agitator at a stage before granulation nuclei are formed (after about 20 minutes have elapsed from the start of operation). It can be seen that it is possible to determine whether or not an appropriate granulation nucleus can be obtained. In the present embodiment, the control unit 23 performs the above-described determination, and determines whether to continue granulation, add water to the pan 3, or exhaust the inside of the pan according to the determination result. That is, as shown in FIG. 2, when the power consumption value detected by the detector 24 is less than an appropriate range at about 20 minutes after the start of operation, the drive torque of the agitator drive motor 15 is small, and Is determined to be in a powdery dry state (there is no possibility of forming granulation nuclei), the electromagnetic on-off valve 20 is opened for a predetermined time, water is added to the pan 3, and granulation is performed, and 30 minutes or more from the start of operation A good granulation nucleus is to be created at the time of passage. In addition, when the electric power value exceeds the appropriate range as shown in FIG. 4, the driving torque of the agitator driving motor 15 is large, and the inside of the pan has a large amount of moisture, and even if the granulation nuclei are formed in a sticky state, the sticky defect occurs. When the blower 21 in the middle of the exhaust duct 19 is operated for a predetermined time, moisture in the bread is discharged, the inside of the bread is dried, and at the same time, the outside air is introduced into the bread to lower the temperature. I do. Thereby, good granulation nuclei can be obtained. The exhaust operation of the blower 21 is executed until the temperature inside the pan is detected by the temperature detector 22 and a predetermined temperature drop is confirmed. Note that if the power consumption value is within the appropriate range at about 20 minutes after the start of operation as shown in FIG. 3, it is determined that a good granulation nucleus will be created if normal operation is continued as it is. Continue operation without adding or exhausting water.

In the above embodiment, the control is performed by paying attention to the power consumption of the motor 15 for driving the agitator. However, when the supply voltage to the motor 15 for driving the agitator is known, the current flowing to the motor 15 is paid to attention. Similar results can be obtained by controlling. In the above embodiment, one independent agitator drive motor 15 is used as a drive source of the high-speed agitator 5, so that control is performed by focusing on this power consumption.
Since the same tendency as that of the agitator driving motor 15 is observed with respect to the current of the agitator driving motor 15, the control may be performed by focusing on the current of the pan driving motor 7 .

In the above embodiment, an agitator driving motor 1 is used as a means for detecting the fluidity (viscosity) of the raw material in the bread.
Although attention has been paid to the power or current value of No. 5, the detection rod may be suspended from the lid side into the raw material in the pan, and the fluidity of the raw material may be detected from the stress applied to the detection rod. At this time, the stress is converted into an electric signal and the detection result is supplied to the control unit. Further, a torque meter may be inserted between the motor rotation shaft of the pan driving motor 7 or the agitator driving motor 15 and the transmission mechanism, and the fluidity of the raw material in the pan may be known from the torque detection result.

[0024]

As described above, according to the present invention,
In the case of mixing and granulating using a stirring and mixing type mixing granulator, mixing granulation with uniform particle size and density (high density) Granules can be obtained automatically. For this reason, there is an advantage that it is not necessary to rely on the skill of the operator, and there is no granulation failure or re-granulation. Further, there is no need to make the same conditions at the start of the operation such as the dry state of the mixing granulator and the dry state of the powder, and the production efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a mixing granulation apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing a relationship between an operation time, an agitator rotation speed, an agitator load, and a pan load when a water content is insufficient.

FIG. 3 is an explanatory diagram showing a relationship among an operation time, an agitator rotation speed, an agitator load, and a pan load when a water content is appropriate.

FIG. 4 is an explanatory diagram showing a relationship among an operation time, an agitator rotation speed, an agitator load, and a pan load when the water content is excessive.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Erich-backflow high-speed mixer 3 Pan 4 Mixing star 5 High-speed agitator 7 Pan driving motor 15 Agitator driving motor 18 Water supply pipe 19 Exhaust duct 20 Electromagnetic on-off valve 21 Blower 22 Temperature detector 23 Control unit 24 Power or current detection vessel

Claims (2)

(57) [Claims] A ceramic container comprising a rotating container, a rotating tool rotating in the container, a first motor for rotating the rotating container, and a second motor for rotating the rotating tool. A mixing and mixing type mixing granulator for mixing and granulating by adding a liquid to the powder of the product, and a detecting means for detecting the fluidity of the material in the rotating container,
An on-off valve for opening and closing a liquid supply pipe for supplying liquid into the rotating container, an exhaust unit for exhausting air in the rotating container, a detection output of the detection unit, and the detection output is excessively fluid. And a control means for operating the exhaust means when the detection output indicates that the fluidity is too low. 2. The mixing and granulating apparatus according to claim 1, wherein the detecting means for detecting the fluidity of the material in the rotating container detects a power or current value of the first or second motor.