JPH11113549A - Drum type coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and sufficiently attach an additive such as flavor to the surface of granules of dog food or the like without pulverizing granules. SOLUTION: A rotation drum is rotatably attached and a diaphragm 4 is provided in the interior. In the diaphragm 4, this side is inclined by 34 deg. in the right direction of the figure to a line A parallel to longitudinal direction of a rotation drum and inclined by 25 deg. to 45 deg. (average 35 deg.) to perpendicular line B drawn from the attaching part to the interior of the rotation drum to rotation shaft of the rotation drum. Therefore, granules or the like are successively moved to outlet side by rotation of the rotating drum and rubbed against each other and additive can strongly be attached to the surface in high yield in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for adhering powder or the like to the surface of a granular material, and more particularly, to providing a spiral feed blade on the inner surface of a rotary drum and moving the powder material forward by the feed blade. The present invention relates to a drum-type coating apparatus for adhering an additive fed together with a granular material to a surface of the granular material while feeding. Further, the present invention relates to a drum type coating apparatus in which a partition plate is provided at a predetermined angle in a passage formed by a feed blade and adhesion of an additive to a granular material is improved.

[0002]

2. Description of the Related Art For example, in the case of manufacturing a dock food, after a main material of the dock food is formed into a powdery material, an additive such as an oil or a fragrance is attached to the surface of the powdery material by about 1%. is there. As described above, a rotary-type coating device and a drum-type coating device are known as devices for attaching additives such as oil and fragrance to the surface of relatively fragile powder or granular material such as a dock food. .

As shown in FIG. 8, a rotary type coating apparatus, a so-called pan type coating apparatus, mounts an octagonal rotary container 42 so as to be rotatable around a diagonally set rotation axis. This is a device in which the granular material and the additive are charged, and the rotating container 42 is rotated for a predetermined time to cause the additive to adhere to the surface of the granular material.

In the drum type coating apparatus, a cylindrical rotary drum is rotatably mounted with one inlet side slightly elevated, and a plate-like or mountain-like rotary drum is provided on the inner surface of the rotary drum 30 as shown in FIG. The baffle plate 33 is appropriately arranged, and while the rotating drum 30 is rotated, the granular material and the additive are sequentially charged from the inlet side, and the granular material and the like are applied to the baffle plate 33 and the outlet side is downstream. It is a device that is dropped to make the additive adhere to the surface of the powder.

[0005]

However, in the conventional pan-type coating apparatus 40, the powder and granules for one treatment are put into the rotary container 42 at a time, and the treatment is performed. However, there was a point that it was difficult to automate because it was not continuous. In addition, since the upper surface of the rotary container 42 is generally open, the powdery additive is scattered, and further, the additive not adhered to the granular material causes the additive to adhere to the inside of the apparatus in a process after coating. There was something. In particular, the occurrence of adhesion inside the packaging machine adversely affects the weighing accuracy.

In addition, in the conventional drum type coating apparatus, the powder is vertically moved by the baffle plate 33 or the like. However, the additive is adhered to the mottle or the adhesive force of the additive is weak. The added additive immediately dropped off from the surface of the powder. In addition, when the height of the baffle plate 33 is increased, crushing of the granular material may occur during the attachment operation. Further, since the granular material sequentially moves in the rotating drum 30 due to the inclination of the rotating drum 30, the moving speed varies depending on the shape of the granular material and the like, and it takes time and effort to adjust the speed. There is a point that it is difficult to set the rotation speed and the inclination angle of the rotating drum 30, for example, when the rotation speed is insufficient or when it takes too much time.

Further, a conventional drum type coating apparatus is
In the case of a plate-shaped baffle plate 34 as shown in FIG.
Are along the longitudinal direction of the rotating drum 32 and the rotating drum 3
2, when the baffle plate 34 is inclined to approximately 45 degrees in the rotary drum 32, the granular material 10 lifted by the baffle plate 34 begins to fall. Then, the granular material 10 falls toward the bottom of the rotary drum 32, so that the granular material 10 directly falls on the granular material 10 deposited on the lower part of the rotary drum 32 from above, and the granular material 10 There is little chance that the particles 10 rub against each other or come into contact with the additive, and the impact of the drop is large, which has been a cause of crushing the fragile powder particles 10.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a drum type coating apparatus is constituted as follows. That is, a drum type includes a rotating drum, a driving mechanism for rotating the rotating drum, and a feed blade spirally provided on the inner surface of the rotating drum, for sequentially transporting the granular material and the additive to the outlet side of the rotating drum. Was constructed. In this coating apparatus, a spiral passage is formed on the inner surface of the rotating drum by a feed blade, and the rotating drum is rotated, and the powder and granules charged into the rotating drum and the additive are internally rolled, so that the powder is formed. The additive can be efficiently adhered to the surface of the granules, and the powder and the like can be advanced from the inlet side to the outlet side of the rotary drum sequentially by one pitch of the feed blade for each rotation of the rotary drum. In addition, it is possible to continuously perform the coating treatment of the powdery and granular materials with a constant processing capacity. In addition, since the rotating drum is installed horizontally, the internal residence time of the granular material can be lengthened, and since the processing is continuous, the processing capacity per time is higher than that of the batch processing.

In addition, a partition plate is provided in a spirally formed passage in the rotary drum, and the passage is divided at an appropriate interval. Then, the operation of the powder and the additive being advanced by the rotation of the rotary drum, being lifted upward by the partition plate, and falling when the rotary drum further rotates is repeated. Thereby, the additive can be better adhered to the surface of the granular material.

[0010] Further, the powdery granular material lifted by the partition plate,
Drop along the inclined surface of the granular material accumulated at the lower part of the rotating drum, or fall along the inclined surface of the mountain of the granular material raised by the next partition plate. , The partition plate provided on the feed blade is inclined at an appropriate angle in the rotation direction, and appropriately in the traveling direction of the granular material so that the falling of the granular material starts sequentially from the traveling direction of the granular material. It was decided to incline.

As a specific numerical value of the inclination, the angle of the partition plate with respect to a perpendicular line lowered from the mounting point of the partition plate to the rotation axis of the rotary drum is set to 25 to 45 degrees on average, and is parallel to the rotation center axis of the rotary drum. The angle with respect to the line was set to 20 to 45 degrees. The angle of the partition plate with respect to the vertical line lowered from the mounting point of the partition plate to the rotation axis of the rotary drum is 25 on average.
The reason for having a width from 45 degrees to 45 degrees is that the partition plate is also inclined with respect to a line parallel to the rotation center axis.

When a partition plate is attached at such a position,
The powder particles lifted by the rotation of the rotating drum flow down along the inclined surface of the powder particles deposited on the bottom surface, so that the additive adheres to the entire surface of the powder particles and the powder particles come into direct contact with each other As a result, the additive is pushed into the inside of the granular material, the adhesive force of the additive can be strengthened, and the impact force due to falling or the like is reduced, so that the crushing of the granular material can be prevented.

[0013]

Next, an embodiment of a drum type coating apparatus according to the present invention will be described.

As shown in FIG. 2, the drum type coating apparatus 1 comprises a rotary drum 2 and a base 20 for rotating the rotary drum 2, and the like. The motor 20 is rotatably mounted on a drive mechanism 22 provided on the motor 20 and is rotated by the drive mechanism 22 at an arbitrary rotation speed. In the rotary drum 2, the right side in the figure is an input port, and the left side in the figure is an outlet.

As shown in FIG. 3, the rotary drum 2 is hollow, has a slightly narrower tip on the outlet side, and has a feed blade 6 formed spirally on the inner surface. The feed blades 6 are provided perpendicular to the inner surface of the rotary drum 2 at a predetermined pitch, and a spiral passage 8 is formed by the feed blades 6. In the inside of the passage 8, the partition plates 4 are attached at substantially equal positions at four places per circumference of the passage 8.

Next, the partition plate 4 will be described in detail.

FIG. 1 is a view of the partition plate 4 as viewed from the outlet side of the rotary drum 2, and the back of the drawing is an input port for charging the powder 10 and additives, etc., and the rotary drum 2 rotates. As a result, the granular material or the like sequentially moves to the outlet side before the drawing. As shown in FIG. 1, the partition plate 4 is inclined 34 degrees to the right in the drawing with respect to a line A parallel to the longitudinal direction of the rotary drum 2 on the front side with respect to the back. Perpendicular line B lowered from the mounting part to the rotating shaft of rotating drum 2
Is inclined from 25 degrees to 45 degrees (average 35 degrees).

The coating operation using the drum type coating apparatus 1 is performed by using a powdery or granular material 10 in which the main component of the dock hood is formed into a granular form from the input port of the drum type coating apparatus 1.
And a predetermined amount of powder, for example, beef extract, to be attached to the surface of the granular material 10
To start the rotation of the rotary drum 2. The rotating drum 2 is rotated via a driving wheel 26 connected to the motor 24 when the motor 24 of the driving mechanism 22 operates.

When the rotating drum 2 rotates, the powder 1
4 is lifted by the partition plate 4 as shown in FIG. 4 and FIG. 5, and when the partition plate 4 is inclined at about 45 degrees, the granular material 10 starts to fall from the partition plate 4. When the granular material 10 falls, the inside of the rotary drum 2 starts moving the granular material 10 by the next partition plate 4, and the falling granular material 10 is raised as shown in FIG. The powder 10 falls so as to roll down on the inclined surface surface.

When the rotary drum 2 further rotates by 1/4, the powder advances approximately 1/4 pitch in the direction of the outlet and the powder 10 drops again from the partition plate 4 as described above. In this way, the granular material 10 is sequentially lifted by the partition plate 4 and vertically moved, and at the same time, sequentially advances in the passage 8. When the granule 10 falls, it falls along the slope of the other granule 10 together with the powdered beef extract, so that the granules 10 come into contact with each other. It adheres evenly and is pushed inside and adheres strongly to the surface. Further, since the granular material 10 rolls down on the other granular material 10, unlike the case where the granular material 10 is dropped from a high place, damage such as crushing is very small. Furthermore, if the powder 10 and the powder are continuously fed, the adhesion process can be performed continuously, so that more powder 10 can be processed per unit time as compared with a batch type coating apparatus. it can.

[0021]

Next, the experimental results of the drum type coating apparatus will be described.

The experiment was carried out using a drum type coating apparatus and a pan type coating apparatus having an octahedral rotating container.
The results were obtained by X-ray fluorescence analysis or the like. FIG. 9 shows the specifications of the drum type coating apparatus and the pan type coating apparatus used in the experiment. The total length of the rotary drum of the drum type coating device is 2000 mm, the outer shape is 450 mm, the width of the feed blade is 80 mm, the pitch of the feed blade is 120 mm, the height of the partition plate is 80 mm, the inclination angle of the partition plate (rotation from the mounting point of the partition plate) The inclination angle with respect to the vertical line lowered to the rotation axis of the drum is 45 to 25 degrees (average 35 degrees), and the mounting angle (the inclination angle of the rotation drum with respect to the axial direction) is 34 degrees.

The rotating speed of the rotating drum is 24 rpm, the granular material is a dock food having a liter weight of 400 g / l, the processing capacity is 1.1 t / h, and the amount of the additive (beef extract) is 1 weight per the granular material. %.

COMPARATIVE EXAMPLE A coating process using a pan-type coating apparatus having a rotating container having an octahedral shape, a throughput of 80 kg / batch, a coater rotation speed of 21 rpm, a residence time of one batch of 2.5 minutes, and an additive (beef extract) ) Was 1% by weight with respect to the granular material.

Experimental Results The experimental results are shown in FIG. As shown in FIG. 10, there is no significant difference between the drum-type coating apparatus of the present invention and the pan-type coating apparatus of the comparative example in terms of visual adhesion. The result of product fluorescent X-ray analysis showed no significant difference between the two.
For the amount of adhesion (AVG (average value of 10 samples)), the drum type coating apparatus was 423, for the comparative example 442, and for the variation (σx (variation of 10 samples)), the drum type coating apparatus was 12.4, and the comparative example was 39.8. As for the salt concentration, the drum type coating apparatus was 0.23% and the comparative example was 0.25%.

[0026]

The drum type coating apparatus of the present invention
The rotating drum is installed horizontally, and a spiral passage is formed on the inner surface of the rotating drum. Continuous automatic operation becomes possible. Since the opening area is small, scattering of powder during processing can be reduced. Compared with a pan-type coating apparatus, a coating apparatus having the same processing capacity can be reduced in size. Since both the powder and the particles move together, only the additive does not remain in the rotating drum, and it is easy to change the additive and the like.

Further, a partition plate is provided on the spiral feed blade, and the provided partition plate is fixed at a predetermined angle with respect to a vertical line lowered from a mounting point of the partition plate to a rotating shaft of the rotating drum and an axial direction of the rotating drum. Since the attachment is provided with an inclined angle, the additive can be uniformly and firmly adhered to the surface of the powder and granules, and the coating treatment can be performed continuously and in a short time with little crushing. it can.

[Brief description of the drawings]

FIG. 1 is a view showing a partition plate of a drum type coating apparatus according to the present invention.

FIG. 2 is a view showing a drum type coating apparatus according to the present invention.

FIG. 3 is a view showing a rotating drum of the drum type coating apparatus according to the present invention.

FIG. 4 is a view showing a rotating drum of the drum type coating apparatus according to the present invention.

FIG. 5 is a view showing a rotating drum of the drum type coating apparatus according to the present invention.

FIG. 6 is a view showing a rotating drum of a conventional drum type coating apparatus.

FIG. 7 is a view showing a rotating drum of a conventional drum type coating apparatus.

FIG. 8 is a view showing an octahedral coating apparatus.

FIG. 9 is a table showing experimental results.

FIG. 10 is a table showing experimental results.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum type coating apparatus 2, 30, 32 Rotary drum 4 Partition plate 6 Feeding blade 8 Passage 10 Powder 20 Granularity 20 Drive mechanism 24 Motor 26 Drive wheel 33, 34 Baffle plate 40 Pan type coating apparatus 42 Rotating container

Claims (4)

[Claims] 1. A feed blade is formed spirally along an inner surface of a rotary drum, and powder and granules and an additive to be attached to the surface of the powder and granules are charged from one end of the rotary drum, Rotating the rotary drum to move the granular material and the additive toward the other end of the rotary drum by the feed blade, thereby causing the additive to adhere to the surface of the granular material. Drum type coating equipment. 2. The drum type coating apparatus according to claim 1, wherein a partition plate is provided in a passage formed between the feed blades. 3. The granular material lifted by the partition plate in the rotating drum rolls down on an inclined surface of the granular material deposited below the rotating drum, and advances the granular material. The drum type coating apparatus according to claim 2, wherein the partition plate is attached so that the powder particles start falling from a direction. 4. An inclination angle of the partition plate at an average of 25 to 45 degrees with respect to a perpendicular line dropped from a mounting point of the partition plate to a rotation axis of the rotary drum, and a direction of a rotation axis of the rotary drum. 4. The drum type coating apparatus according to claim 3, wherein a downstream side of the partition plate is provided to be inclined from 20 degrees to 45 degrees toward the rotation direction.