JPH09206574A - Continuous mixing method of materials - Google Patents

Abstract

(57) [Summary] PROBLEM TO BE SOLVED: To mix materials to be mixed such as granular materials and additives.
Reduces time variability and keeps airtight for a long time continuously
A continuous mixing method of materials that can be mixed is provided. SOLUTION: Along the rotation axis R, the segments are sequentially divided from the first.
A plurality of divided mixing chambers K₁, K_Two, K _ThreeMixing container with
10 first mixing chamber K₁Granular material and additive M
Continuously charging, mixing container 10 centering on the rotation axis R
Rotate alternately in one direction and the opposite direction, and when rotating in one direction
Is an odd-numbered mixing chamber K including the first mixing chamber₁, K_Three
Then, the granular material and additive M are retained and mixed, and the even-numbered mixture is mixed.
Room K_TwoGranular material and additive M of the next adjacent odd number
Mixing room K_ThreeTo an even number when rotating in the opposite direction.
Eye mixing chamber K_TwoThen, the granular material and additive M are retained and mixed
Then, odd-numbered mixing chamber K₁, K_ThreeOf granular material and additive M
Next adjacent even-numbered mixing chambers K, respectively_Two, Move to the outside
Send.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous mixing method for materials, and more particularly to a continuous mixing method for materials in which variations in mixing time of the materials are reduced and which can be continuously mixed in a closed state for a long time.

[0002]

2. Description of the Related Art Conventionally, a batch mixing method and a continuous mixing method are available as a method for mixing an additive such as a crosslinking agent, an antioxidant and a coloring agent with a granular material such as polyethylene pellet which is often used as a coating material for electric wires. is there.

FIG. 8 is a side sectional view showing a conventional batch type mixing apparatus. As shown in FIG. 8, a main body 50 of a conventional batch type mixing device has an inlet port 51 into which a granular material is introduced and an outlet port 52 at the bottom thereof. Body 50
A rotary shaft 54, to which a plurality of stirring blades 53 are attached in a predetermined arrangement, is arranged inside the container substantially perpendicular to the passage of the granular material from the inlet 51 to the outlet 52. At the end of the rotary shaft 54 protruding outside the main body 50, the motor 5
5 is connected.

On the other hand, the charging material for the charging port 51 is granular material 5.
A hopper 56 for introducing into 1 is attached. In addition to the charging port 51, an additive supply port 57 for supplying an additive is provided on the upper portion of the main body 50. The additive supply port 57 is provided on the lid 5 except when the additive is supplied in order to prevent foreign matter from entering the inside of the main body 50.
Sealed at 8.

In the conventional batch type mixing device, the main body 5 is previously prepared.
After a predetermined amount of the granular material is supplied into 0 through the hopper 56 and the charging port 51, an appropriate amount of the additive is supplied from the additive supply port 57. Then, the rotating shaft 54 is rotated by the motor 55, and the stirring blade 53 uniformly mixes the granular material and the additive. After the mixing is completed, the mixed material taken out from the outlet 52 is supplied to a device used in the next step such as an hopper of an extruder.

FIG. 9 shows a conventional continuous mixer. As shown in FIGS. 9 (A) and 9 (B), a main body 60 of a conventional continuous mixing device is formed into a substantially cylindrical shape, and one end surface of the main body 60 has a charging port 61 for charging a granular material to the other. The discharge port 62 is provided on the side end surface. The main body 60 is arranged so as to be inclined downward from the input port 61 toward the discharge port 62, and is rotated in the direction of the arrow (see FIG. 9B) by a driving unit (not shown). An agitator 63 is attached to the inner wall surface of the main body 60 in a predetermined arrangement. A nozzle 64 for discharging the additive is attached near the charging port 61 of the main body 60. In addition, 65 is the granular material and additive which are mixed.

In the conventional continuous mixer, the granular material is continuously charged from the charging port 61 into the main body 60 rotating in a certain direction, and the additive is discharged from the nozzle 64.
The particulate material and additives are mixed within the body 60. Then, after a certain amount of the granular material and the additive are retained inside the main body 60 after the granular material is charged, the main body 6 is passed through the charging port 61.
Exhaust port 6 by the amount of granular material and additives charged into
Emitted from 2. The discharged mixed material is sent to the next step such as an extruder.

[0008]

In the conventional batch type mixing apparatus, when the rotating shaft 54 is rotated, the stirring blade 53 does not come into contact with the inner wall surface of the main body 50 and metal pieces or the like are not generated.
A clearance is provided between the inner wall surface of the main body 50 and the stirring blade. Therefore, even if the additive adheres to the inner wall surface of the main body 50, the additive cannot be removed and deteriorates, so that the mixing cannot be performed for a long time. Further, when the additive adhering to the inner wall surface of the main body 50 is removed, the inside of the main body 50 is in an open state, so that there is a high risk of foreign matter being mixed in.

Further, in the conventional continuous mixer, the granular material is
There is a problem that the mixing time of ingredients and additives varies greatly.
there were. FIG. 10 shows a diameter of 1.15 m and a length of 1.95 m.
Rotate the rotary mixing container at an inclination angle of 5 ° and rotation speed of 6 rpm
And bulk specific gravity of 0.5 g / cm ^Three72 kg / granular material
It was supplied in a fixed amount by the hr
Supply a fixed amount, then return to the original supply state and supply coloring material
It is a graph that measured the time distribution from discharge to discharge
You.

As can be seen from FIG. 10, the coloring material is discharged in less than 10 minutes at an early stage, and the total amount is 50.
After about 70 minutes, it was not possible to read from FIG. 10, but it took 15 hours for complete discharge. In this way, since there is a large variation in the mixing time from when the granular material is put into the mixing device to when it is discharged, there is a large variation in the amount of the additive added for each grain, and when the mixture is mixed for a long time, Dry particles may come into contact with each other to generate powder.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a continuous mixing method for materials, which reduces variations in the mixing time of the materials and allows continuous mixing for a long time in a closed state. And

[0012]

A method for continuously mixing materials according to the present invention is provided in a first mixing chamber of a mixing container having a plurality of mixing chambers which are substantially divided in order from the first along an axis of rotation. , The materials to be mixed are continuously charged, and the mixing container is alternately rotated around the rotation axis in one direction and in the opposite direction, and at the time of rotation in one direction, an odd-numbered number including the first mixing chamber In the mixing chamber, the materials are retained and mixed, the materials in the even-numbered mixing chambers are transferred to the next adjacent odd-numbered mixing chambers, and when rotating in the opposite direction, the materials are retained and mixed in the even-numbered mixing chambers, The material in the odd-numbered mixing chamber is transferred to the next adjacent even-numbered mixing chamber.

The materials to be mixed are, for example, granular materials such as polyethylene pellets, which are often used as coating materials for electric wires, and additives such as a crosslinking agent, an antioxidant and a coloring agent.

According to the present invention, the material supplied to the mixing container is accumulated in the chamber inside the mixing container by rotating the mixing container alternately in one direction and the opposite direction about the rotation axis.
By repeating the mixing and the transfer to the next chamber next to the next chamber, the materials are mixed while being transferred in a substantially batch manner.

Therefore, there is no great variation in the mixing time from when the materials to be mixed are put into the mixing container to when they are discharged, and it can be suppressed within a certain time.

Further, since the materials can be continuously mixed, the mixing system can be kept almost completely sealed.

Furthermore, since the mixing container rotates alternately in one direction and in the opposite direction, it is possible to prevent the material from adhering to the inner wall surface of the mixing container and deteriorating.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an overall configuration diagram showing an apparatus for carrying out the continuous mixing method of the granular material and the additive of the present invention. In the figure, 1 is a preheating hopper for heating the granular material, 2 is a material quantitative transfer device for transferring the granular material heated by the preheating hopper, 3 is an additive for spraying and adding the additive to the granular material A spray pipe, 4 is a mixing device for continuously mixing the granular material and additives, 5 is a cushion tank, 6 is a rotary feeder, and 7 and 8 are blowers for generating air for material transportation.

The mixing device 4 has a mixing container 10 formed in a substantially cylindrical shape. The mixing container 10 has a charging unit 11 for charging a granular material and an additive at one end, and a discharging unit 12 for discharging the mixed material after the mixing process at the other end thereof. It is provided on a bed 13 which is arranged at an angle of about 7.5 ° with respect to the horizontal direction such that the side faces upward.

Two driven gears 14, 14 are attached to the outer peripheral portion of the mixing container 10, and the driven gears 14, 14 are attached.
Engage with drive gears 15, 15 provided on the bed 13. Since the drive gear 15 is connected to the drive shaft 16a of the motor 16 provided on the bed 13 via a speed reducer (not shown), the rotational force of the motor 16 is reduced by the speed reducer, the drive gear 15, and the driven gear. Mixing container 10 through 14
Is transmitted to The mixing container 10 alternates forward rotation (clockwise rotation) and reverse rotation (counterclockwise rotation) about a rotation axis R extending from the charging unit 11 to the discharging unit 12,
It rotates at 10 rpm in a cycle of forward rotation time T ₁ 25 minutes and reverse rotation time T ₂ 4 minutes.

Mixing container 10 and charging section 11 and discharging section 12
In order to prevent the intrusion of foreign matter, a space between and is sealed by nitrogen gas supplied from the nitrogen gas supply device 17. Further, since a slip ring type tape heater (not shown) is wound around the body of the mixing container 10 and the outer peripheral portion thereof is covered with a heat insulating material, the granular material and the additive can be heated even during rotation.

FIG. 2 is a perspective view showing the internal structure of the mixing container 10. As shown in FIG. 2, in the mixing container 10,
The disk 20, the first partition wall 21, the second partition wall 22, and the discharge lifter 23 are integrally attached to the inner wall of the mixing container 10 at a predetermined interval. Therefore, the inside of the mixing container 10 is substantially divided into three chambers in the longitudinal direction along the rotation axis R. Here, between the disk 20 and the first partition wall 21, the first partition wall 2
Between the first and second partition walls 22, the second partition wall 22 and the discharge lifter 23
The spaces between them are called the first mixing chamber K ₁ , the second mixing chamber K ₂ , and the third mixing chamber K ₃ , respectively.

A charging hole 20a communicating with the charging portion 11 is opened at the center of the disc 20, and the granular material and the additive are supplied from the charging hole 20a.

As shown in FIG. 3 (A), the first partition wall 21 has approximately ½ of both ends of a cut donut-shaped disk.
It is formed in a right-handed spiral shape so as to overlap at a predetermined interval by 0 to 1/3 rotation. On the other hand, the second partition wall 22 is formed in a left-handed spiral shape. First
The diameter of the circular holes of the partition wall 21 and the second partition wall 22 is about 500 m.
m, the width of the gaps 21a, 22a (see FIG. 2) is about 18
It is 0 mm. The first mixing chamber K ₁ and the second mixing chamber K ₂ are
The partition 21 is connected via a gap 21a (see FIG. 2), and the second mixing chamber K ₂ and the third mixing chamber K ₃ are connected via a gap 22a of the second partition 22 (see FIG. 2).

Further, as shown in FIG. 3 (B), when the granular material and the additive in the mixing chamber stay above the level L, the granular material and the additive in the S portion flow back to the anterior chamber.
Granular materials and additives of level L and above cannot be retained, and the mixing efficiency will drop. Therefore, in order to increase the storage amount of the granular material and the additive that do not flow back into the front chamber, a slope 24 is provided in the lap portion of the first partition wall 21 (second partition wall 22) as shown in FIG. May be.
In this case, the flat plate 24a may be attached to the lower portion of the slope 24 so that the granular material and the additive do not enter.

Since the first partition wall 21 is formed in a spiral shape with a right-hand thread, when the mixing container 10 is rotating forward,
Acts to a direction to push the particulate material and additives of the first mixing chamber K in ₁ to material input side, particulate materials and additives in the first mixing chamber K ₁ is to transfer to the second mixing chamber K ₂ Not first
Mix while staying in the mixing chamber K ₁ . When the mixing container 10 is rotating in the reverse direction, the first partition wall 21 acts so as to push the granular material and the additive in the first mixing chamber K ₁ into the second mixing chamber K _2, and thus the first mixing chamber K ₁ of the particulate material and additives pass through the gap 21a of the first partition wall 21, is transferred to the second mixing chamber K _2.

Since the second partition wall 22 is formed in the spiral shape of the left-handed screw, when the mixing container 10 is rotating in the forward direction, the granular material and the additive in the second mixing chamber K ₂ can be mixed in the second partition wall 22.
Of the granular material and the additives are not transferred to the third mixing chamber K ₃ but are transferred to the third mixing chamber K ₃ through the gap 22a of the second mixing chamber 10 while the mixing container 10 is rotating in the reverse direction. Retained and mixed in K ₂ .

The discharge lifter 23 has a circular hole 25a at the center thereof.
25 having a circle and the outer periphery of the circular hole 25a of the disk 25
The hollow cylindrical protrusion 26 attached to the
A scooping part formed in a mountain shape and provided vertically on the projecting part 26
It consists of 27. The circular hole 25a of the circular plate 25 is connected to the discharge unit 12.
Through. In addition, the base end of the scooping portion 27
An opening 26a is formed near the portion. Scooping part 27
In the third mixing chamber K_ThreeProtrusion by picking up the granular materials and additives of
A scooping surface 27a for inserting into the opening 26a of the portion 26
Have. The scooping portion 27 is formed from the opening 26a of the protrusion 26.
Is also on the forward rotation side, and the scooping surface 27a is in the reverse rotation direction (counterclockwise).
Mounted on the protrusion 26 so as to face (clockwise)
You. Therefore, when the mixing container 10 is rotating forward, the third mixing
Combined container K _ThreeThe granular materials and additives inside are outside the mixing container 10.
Not discharged to the third mixing chamber K_ThreeStays, mixes and mixes in
When the container 10 is rotating in the reverse direction, the third mixing chamber K_ThreeGranular material
And the additive is scooped up on the scooping surface 27a, and the opening
26a, through the circular hole 25a to the outside of the mixing container 10
Is done.

The mixing container 10 rotates forward in the above-mentioned cycle,
Although the reverse rotation is repeated, when the granular materials and the additive are supplied in a fixed amount, the maximum amount of the material staying in each chamber in the mixing container 10 is changed to the normal rotation in the first mixing chamber K ₁ and then the reverse rotation is performed. During the forward rotation (25 minutes), the second mixing chamber K ₂ is supplied with the granular material and the additive accumulated in the first mixing chamber K ₁ during forward rotation and the reverse rotation (4 minutes). ), The granular materials and additives supplied to the mixing vessel 10, the third mixing chamber K ₃
Is the same amount as the second mixing chamber K ₂ because the granular materials and the additives that have stayed and mixed in the second mixing chamber K ₂ are transferred. Therefore, when the mixing container 10 repeats normal rotation and reverse rotation in the above-described cycle and the granular material and the additive are supplied at 200 kg / hr, 100 kg or more of the granular material and the additive do not stay in each chamber. .

The diameter of the mixing container 10 having a substantially cylindrical shape is 1.4 m and the length is 2.4 m, the rotation axis R is inclined by 7.5 ° with respect to the horizontal direction, and the circles of the partition walls 21 and 22 are respectively. The diameter of the holes is 500 mm, and the widths of the gaps 21a and 22a are about 18
0 mm, and under this condition, in the case of a granular material having a diameter of 3 mm, a length of 3 mm and a bulk specific gravity of 0.5 g / cm 3, even if 100 kg stays in each chamber in the mixing container 10, the backflow of the material to the front chamber does not occur. It never happens. The first partition wall 21, the second partition wall 22, and the discharge lifter 23, which are the transfer mechanism of each mixing chamber, have a rotation speed of the mixing container 10 of 10 rpm when 100 kg of the granular material and the additive are accumulated in each mixing chamber. It was sometimes confirmed by experiments that the material could be completely transferred to the outside of the mixing container 10 in less than 3 minutes.

Next, the case where the granular material and the additive are mixed by the apparatus configured as described above will be described.

First, a granular material such as polyethylene pellets is put into the preheating hopper 1 and heated to 80 ° C. to facilitate impregnation with the additive. The heated granular material is supplied into the mixing container 10 through the charging unit 11 at a rate of 200 kg / hr by the material quantitative transfer device 2. For the granular material that is falling before being supplied to the mixing container 10, the material quantitative transfer device 2
In the additive spray pipe 3 provided between the mixing container 10 and the mixing container 10, the additive is sprayed and added from the spray nozzle 3a. As the additive, for example, Mark AO23 (trade name), which is marketed by ADEKA A-GAS CHEMICAL CO., LTD. And is often used as an anti-aging agent for wire coating materials, and dicumyl peroxide, which is often used as a crosslinking agent, are used. , Sprayed and added at a weight ratio of 0.5% to 1.8% to the material, respectively. Here, since dicumyl peroxide is a solid at room temperature, it is heated to be liquid and then mixed with the mark AO23,
Immediately before spraying, for example, after passing through a fine mesh having an opening of 10 μm, spraying and adding.

FIG. 5 is an explanatory view showing a process until the granular material and the additive supplied to the inside of the mixing container 10 are discharged to the outside of the mixing container 10.

The granular material M to which the additive is added is as follows.
It is supplied to the first mixing chamber K ₁ of the mixing container 10, but when the mixing container 10 is rotating forward, it is not transferred to the second mixing chamber K ₂ and stays in the first mixing chamber K _1. , And are mixed (see FIG. 5 (A)). Then, the granular material and the additive M staying in the first mixing chamber K ₁ and mixed are supplied to the mixing container 10 during the reverse rotation when the mixing container 10 is switched to the reverse rotation. It is transferred to the second mixing chamber K ₂ together with M (see FIG. 5 (B)).

When the mixing container 10 is rotating in the reverse direction, the granular material and the additive M are transferred from the first mixing chamber K ₁ to the second mixing chamber K ₂ , but in the second mixing chamber K ₂ , the mixing container 10 is moved. Are mixed while receiving the supply of the granular material and the additive M from the first mixing chamber K ₁ until the rotation is changed to the normal rotation. And the mixing container 1
When 0 is converted to normal rotation, all the particulate material and additive M in the second mixing chamber K ₂ are transferred to the third mixing chamber K ₃ . During this forward rotation, the granular material and the additive M are not transferred from the first mixing chamber K ₁ to the second mixing chamber K ₂ , so that the granular material and the additive M newly supplied to the mixing container 10 are supplied. Are mixed in the first mixing chamber K ₁ (see FIG. 5 (C)). Then, when the mixing container 10 is switched to the reverse rotation, the granular material and the additive M mixed in the third mixing chamber K ₃ are discharged to the outside of the mixing container 10 and mixed in the first mixing chamber K _1. The granular material and the additive M are transferred to the second mixing chamber K ₂ (FIG. 5).
(D)).

The mixed material discharged from the mixing container 10 is
As shown in FIG. 1, the discharge unit 12, the cushion tank 5,
It passes through the rotary feeder 6 and is sent by the blower 7 to the extrusion device of the next step.

In the above-described mixing process, the mixing time is the shortest among the granular materials and additives continuously supplied to the mixing container 10 immediately before the mixing container 10 is switched from reverse rotation to forward rotation. The granular materials and additives supplied to the mixing container 10 at this time are immediately transferred to the second mixing chamber K ₂ . Then, when the mixing container 10 is switched to the normal rotation, the second mixing chamber K
The granular materials and additives in ₂ are transferred to the third mixing chamber K ₃ ,
Substantially only the third mixing chamber K ₃ receives the mixing action. The mixing time in the opposite becomes maximum is the particulate material and additives supplied immediately after the mixer is converted into forward rotation of the reverse rotation, the particulate material and additives supplied to the first mixing chamber K ₁ Are mixed until the mixing container 10 is switched to the reverse rotation, and then mixed in the first mixing chamber K ₁ and the second mixing chamber K ₂ as well.

The reverse rotation time and the forward rotation time are respectively T ₁ ,
When T ₂ is set, the former granular material and additive are subjected to the mixing action only in the third mixing chamber K ₃ , so the mixing time is about T ₂ , and the latter granular material and additive are
Since the mixing action is performed in all three chambers, the mixing time is about (T ₁ + 2T ₂ ). In this case, if the forward rotation time and the reverse rotation time of the mixing device 4 are the same, the longest mixing time ≈ 3 × the minimum mixing time. Becomes

When the reverse rotation time is shorter than the normal rotation time, the maximum mixing time≈2 × the minimum mixing time.

Therefore, the granular material and additives are mixed in the mixing device 4
It is possible to suppress the mixing time from the time it is charged into the mixing container 10 to the time it is discharged without being greatly varied, and it is possible to suppress the mixing time within a certain time.

When the inventor of the present application uses the above mixing device 4 and (1) injects a fixed amount of the coloring material after 3 minutes of reverse rotation (1 minute before turning to normal rotation) in a constant amount supply operation state,
(2) An experiment was conducted to measure the time from the charging of the coloring material to the discharging of the coloring material when a fixed amount of the coloring material was charged immediately after the rotation was changed to the normal rotation in the operation mode. as a result,
In the case of (1), it was 26 minutes to 28 minutes and 42 seconds, and in the case of (2), it was 54 minutes to 56 minutes and 30 seconds, and it was confirmed that there was no great variation in the mixing time.

When a mixture of Mark AO23 and dicumyl peroxide is mixed in the granular material at a mixing temperature of 80 ° C., if the mixing time is 25 minutes or more, it is used in the next step, for example, an extruder or the like. The mark AO23 and dicumyl peroxide are impregnated into the granular material to the extent that it does not cause a problem, and it takes 60 minutes or more to completely dry the material.
There is no variation in the addition amount of the cross-linking agent for each grain, and powder is not generated due to friction between dry pellets.

Further, since the mixing container 10 is rotated during the mixing, it is possible to prevent the additive from adhering to the inner wall surface of the mixing container 10 and being deteriorated, so that the mixing can be performed for a long time.

FIG. 6 is a perspective view showing the internal structure of a mixing container 40 of another form. As shown in FIG. 6, the mixing container 4
In 0, a disc 41, a first lifter 42, a second lifter 43, and a discharge lifter 44 are integrally attached to the inner wall of the mixing container 40 at predetermined intervals. Disk 41
And the first lifter 42, between the first lifter 42 and the second lifter 43, and between the second lifter 43 and the discharge lifter 44, the space portions are respectively the first mixing chamber K ₁ , the second mixing chamber K ₂ , and the third mixing chamber K ₂ .
The mixing chamber K ₃ is constructed.

The basic structure of each lifter is similar to the discharge lifter 23 of the mixing container 10 shown in FIG.
Scooping portions 42a, 44 of the lifter 42 and the discharge lifter 44
a is attached to the forward rotation side of the openings 42c and 44c of the protrusions 42b and 44b, and the scooping portion 43a of the second lifter 43 is attached to the reverse rotation side of the opening 43c of the protrusion 43b. .

FIG. 7 is an explanatory view showing a route through which the granular material and the additive are transferred by the lifter. As shown in FIG. 7, for example, the granular material and the additive M in the first mixing chamber K ₁ are scooped up by the scooping portion 42a of the first lifter 42 and inserted into the opening 42c of the protrusion 42b. , The second mixing chamber K through the opening 42e of the disc 42d.
Transferred to ₂ .

When the mixing container 40 is rotating forward, the first mixing
Room K₁And the third mixing chamber K_ThreeThe granular materials and additives in each are
While being retained in the mixing chamber, they are retained and mixed. Second mixture
Room K _TwoThe granular material and additive M in the second lifter 43
Scooped up by the third mixing chamber K_ThreeTransferred to
You.

When the mixing container 40 is rotating in the reverse direction, the granular material and the additive in the first mixing chamber K ₁ are scooped up by the first lifter and transferred to the second mixing chamber K ₂ for the third mixing. The granular material and the additive in the chamber K ₃ are scooped up by the discharge lifter 44 and discharged to the outside of the mixing container 40. The granular material and the additive in the second mixing chamber K ₂ are mixed while staying.

The effect of continuously mixing the granular material and the additive using the mixing container 40 is the same as that of using the mixing container 10.

The numerical values and the shapes of the respective members described in the above embodiments are mere examples, and the present invention is not limited to the above embodiments, and the technical matters described in the claims are not limited. Various modifications are possible within the range.

For example, in the above-mentioned embodiment, the mixing vessels 10 and 40 are roughly divided into three mixing chambers, but the present invention is not limited to this, and it is possible to divide into a plurality of chambers along the axis of rotation. Good.

The present invention can be applied not only to mixing the granular material and the additive, but also to mixing the granular materials with each other and three or more kinds of granular materials.

Further, by changing the spiral direction of the partition wall and the mounting position of the scooping portion of the lifter, the order of staying / mixing and transfer during forward rotation and reverse rotation may be reversed.

[0055]

According to the present invention, the mixing container is alternately rotated about the rotation axis in one direction and in the opposite direction.
The materials supplied to the mixing container are mixed in a substantially batch-transfer manner by repeating the staying in the chamber in the mixing container, the mixing and the transfer to the next adjacent chamber.

Therefore, the mixing time from the time when the materials to be mixed are put into the mixing container to the time when they are discharged does not vary greatly and can be suppressed within a certain time. Therefore, it is possible to obtain a high-quality mixed material without variations in the addition amount of the cross-linking agent for each particle and without generation of powder or the like.

Further, since the materials can be continuously mixed, this mixing system can be kept in a substantially closed state, and foreign matter can be prevented from entering.

Furthermore, since the mixing container rotates alternately in one direction and in the opposite direction, it is possible to prevent the materials from adhering to the inner wall surface of the mixing container and deteriorating, so that the mixing can be performed for a long time.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an apparatus for carrying out a continuous mixing method of a granular material and an additive according to the present invention.

FIG. 2 is a perspective view showing an internal structure of a mixing container.

FIG. 3 (A) is a front view showing a first partition wall provided inside the mixing container, and FIG. 3 (B) is an explanatory view of the amounts of granular materials and additives that can be stored in the mixing container. Is.

FIG. 4 is a detailed perspective view showing a lap portion of a first partition (second partition).

FIG. 5 is an explanatory diagram showing a process until the granular material and the additive supplied to the inside of the mixing container are discharged to the outside of the mixing container.

FIG. 6 is a perspective view showing an internal structure of a mixing container of another embodiment.

FIG. 7 is an explanatory view showing a route in which the granular material and the additive are transferred to the next adjacent chamber by the lifter.

FIG. 8 is a side sectional view showing a conventional batch type mixing device.

9A is a side sectional view showing a conventional continuous mixer, and FIG. 9B is a sectional view taken along line IX-IX of FIG. 9A.

FIG. 10 is a graph showing a time distribution from the supply to the discharge of the coloring material when the conventional continuous mixing device is used.

[Explanation of symbols]

1: Preheating hopper 2: Material quantitative transfer device 3: Additive spray pipe 4: Mixing device 10: Mixing container 11: Input part 12: Discharge part 16: Motor 20: Disk 21: First partition wall 21a: Gap 22: No. 2 partition wall 22a: gap 23: exhaust lifter 27: scooping portion R: rotation axis K _1: first mixing chamber K _2: second mixing chamber K _3: third mixing chamber

Claims (2)

[Claims] 1. A material to be mixed is continuously charged into a first mixing chamber of a mixing container provided with a plurality of mixing chambers which are sequentially divided from the first along an axis of rotation, and the mixing is performed. The container is alternately rotated around the axis of rotation in one direction and in the opposite direction, and when rotating in one direction, the materials are retained and mixed in the odd-numbered mixing chambers including the first mixing chamber, and the even-numbered mixing chambers are mixed. The material in the chamber is transferred to the next adjacent odd-numbered mixing chamber, and when rotating in the opposite direction, the material is retained and mixed in the even-numbered mixing chamber, and the material in the odd-numbered mixing chamber is moved to the next adjacent even-numbered mixing chamber. A continuous mixing method of materials 2. The continuous mixing method for materials according to claim 1, wherein the materials to be mixed are a granular material and an additive.