JPH0310370B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bread coating device, in particular, as an aeration drying mechanism, it has an aeration part for aeration drying in the body of a rotatable coaching pan, and is used to coat pharmaceuticals, foods, etc. and various other compositions. Alternatively, the present invention relates to a bread coating device used for coating and drying sugar coating, etc.

Conventionally, when a coating material such as a film liquid or a sugar coating liquid is sprayed onto the surface of a coated material such as a tablet or other granular material in a pan coating device and then the coating material is dried, the tablet as the coated material is coated in a coating pan. A method of drying the tablet layer by blowing hot air onto the surface of the tablet layer while rolling the tablet layer in the coating pan was used. However, in this conventional method,
Although only the tablets in the rolling tablet layer are relatively well dried, the hot air is difficult to reach the stagnation area at the center of the tablet layer and the tablets in the lower layer, resulting in insufficient drying. Therefore, it took a long time to dry all the tablets, and the drying process was uneven.

Therefore, in order to eliminate such drawbacks, the present applicant has already published the first patent application in Japanese Patent Publication No. 50-38713
As shown in the figure, a rotatable coaching pan (rotating drum) 1 has ventilation holes 2, an air supply conduit 3, and an exhaust duct 4 at several locations or all around the body of the rotatable coaching pan (rotating drum) 1.
This paper proposes a pan coaching device equipped with an aeration drying mechanism consisting of an exhaust conduit 5 and an exhaust conduit 5. In this pan coaching device, heated gas flowing into the coaching pan 1 from the air supply conduit 3 is blown onto the tablets 6 rolling in the coaching pan 1, and after passing through the layer of tablets 6, it is exhausted from the porous portion 2. It is exhausted via a duct 4 and an exhaust conduit 5. Therefore, in this pan coating device, when the heated gas passes through the layers of the tablet 6, it almost uniformly contacts not only the surface layer but also the center and lower layer of the tablet, resulting in extremely high thermal efficiency and overall Uniformly dried and homogeneous products can be obtained with good productivity, and it has been put into practical use as an excellent bread coating device. Furthermore, as a result of the high thermal efficiency of this pan-coating device, it is possible to efficiently and economically implement a coating operation using an aqueous coating liquid in which the coating material is dissolved or dispersed in water (Japanese Patent Publication No. 55-5491). reference). In FIG. 1, reference numeral 7 denotes a rotating shaft for rotating the coaching pan 1, 8 a motor that drives the rotating shaft 7 via a transmission means 9 such as a belt or chain, and 10 a rotating shaft for rotating the coaching pan 1.
The bread mouth 11 that forms the material input port for the bread mouth 10 is a lid of the bread mouth 10, and the bread mouth 10, the lid 11, the air supply pipe 3, and the exhaust pipe 5 do not rotate. The rotational joint between the coaching pan 1 and other rotating parts is sealed with a labyrinth seal or the like. Incidentally, in such a conventional bread coaching device, the rotational joint 12 between the inner periphery of the inlet portion (rotating portion) of the coaching pan 1 and the outer periphery of the pan mouth 10 (non-rotating portion) is formed in the circumferential direction. Because of the seal required and the rotation of the coaching pan 1, it was practically impossible to achieve a complete seal. Therefore, this rotational coupling part 1
2, the heated air inside the coaching pan 1 leaks to the outside, causing heat loss and contaminating the working environment, and the outside air enters the coaching pan 1, reducing drying efficiency.

Furthermore, in the prior art, since the air supply conduit 3 is provided on the front side of the coaching pan 1, it is difficult to seal the rotary joint 12 as described above, and in addition, the nozzle can be installed from the front side. There was also the problem that operations such as loading or adding raw materials to be coated were somewhat difficult.

Further, there has been provided an aerated drying type pan coaching device as shown in FIG. 2 which is excellent in terms of sealing the front surface of the coaching pan.

However, with this bread coaching device,
A mechanism in which drying air passes from the air supply pipe 3a through the air supply duct 4a, passes through the tablet layer from the outside to the inside of the layer of tablets 6, that is, toward the center of the pan, and is then exhausted from the rear of the pan through the exhaust conduit 5a. Because of this, when spraying a coating liquid or dusting for powder coating, a significant portion of the sprayed mist and dust is carried away by the drying air flow before it reaches the tablet layer. The disadvantage is that the loss of coaching materials is quite large. In order to avoid this, spraying and drying may be separated and repeated intermittently, but this poses the problem of large time loss and poor productivity.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art described above, and to provide a bread coating apparatus that has a high degree of sealing, excellent thermal efficiency and yield, and is easy to operate.

Another object of the present invention is to provide a bread coating device that can perform good bread coating without reducing the amount of raw material to be coated or the drying efficiency.

In order to achieve the above object, the pan coating device of the present invention includes a horizontal drum-shaped rotating container having a peripheral wall without an inwardly convex portion, and a rotating container formed at at least one location in the axial direction of the peripheral wall of the rotating container. a ventilation duct that covers each of the ventilation holes from the outer peripheral surface side of the rotary container; and a ventilation duct that is connected to the center of the rear surface side in the axial direction of the rotary container, and is connected to a central portion of the rear surface side in the axial direction of the rotary container, and is configured to supply air to the rotary container. A first ventilation pipe that exhausts air from the rotary container, and like the first ventilation pipe, can communicate with the rear end of any one or more of the ventilation ducts on the rear side in the axial direction of the rotary container. a second ventilation pipe that exhausts air from the rotary container or supplies air to the rotary container through the ventilation duct; a center ventilation hole that is rotatably provided together with the rotary container between the connection portion with the ventilation pipe and communicates the center part on the rear side of the rotary container with the first ventilation pipe; and a radius of the center ventilation hole. a rotary plate having outer ventilation holes arranged at predetermined intervals so as to communicate with the ventilation duct at a position corresponding to the rear end of the ventilation duct on the outside in the direction; and a rotary plate that is slidably and sealably connected to the rear surface side of the rotary plate. and a center vent that communicates with the center vent of the rotary plate, and is formed radially outward of the center vent, the rotary plate only when the outer vent of the rotary plate is in a predetermined position. and a fixing plate having an outer vent hole that communicates with one or more of the outer vent holes to bring one or more of the ventilation ducts into communication with the second vent pipe. It is something.

Hereinafter, the present invention will be explained in detail according to embodiments shown in the drawings.

FIG. 3 is a cross-sectional view showing an embodiment of the bread coating apparatus according to the present invention, and parts corresponding to those of the conventional example shown in FIG. 1 are given the same reference numerals.

In this embodiment, a rotatable horizontal drum-shaped coaching pan 1 (rotating container) has a substantially double cone-shaped side surface.

The peripheral wall of the coaching pan 1 including the porous portion 2 (ventilation hole portion) is constituted by a surface having no inwardly convex portion.

An air supply pipe 13 (first ventilation pipe) for supplying heated gas into the coaching pan 1 opens at the center of the rear surface of the coaching pan 1 . On the other hand, an exhaust pipe for heated gas that passes through the layer of objects to be coated, such as tablets 6, and the porous portion 2 (ventilation hole portion) in the coaching pan 1 and is discharged from the bottom of the container via the exhaust duct 4 (ventilation duct). 14 (second ventilation pipe) is disposed such that its base end surrounds the air supply pipe 13 in a double pipe shape.

These air supply pipes 13 and exhaust pipes 14 are fixed, whereas the coaching pan 1 is rotatable, so in order to seal between the rotating part and the non-rotating part, the rear side of the coaching pan 1 and the air supply pipe are connected. A fitting portion 15 is formed between the outlet end of the exhaust pipe 13 and the inlet end of the exhaust pipe 14 . This fitting part 15 consists of a rotary plate 16 (FIG. 4) attached to the rear side of the coaching pan 1, and a fixed plate 17 (FIG. 5) attached to the outlet end of the air supply pipe 13 and the inlet end of the exhaust pipe 14. It consists of both plates 16 and 1
Seal rings 18 and 19 (sixth
) are provided respectively.

As shown in FIG. 4, the rotary plate 16 has an air supply hole 20 (center ventilation hole) in the center for passage of supply air,
Further, ring grooves 21 and 22 for accommodating the seal rings 18 and 19 are respectively formed on the rear side of the periphery, that is, on the side facing the fixed plate 17, and between the ring grooves 21 and 22, an exhaust A total of four exhaust holes 23 (outside ventilation holes) are provided at intervals of 90 degrees from each other to allow the passage of air only at a predetermined position (lower position).

On the other hand, the fixing plate 17, as shown in FIG.
At the center is an air supply hole 24 that constantly interlocks with the air supply hole 20.
(center ventilation hole), and ring grooves 25 and 26 for accommodating seal rings 18 and 19, respectively, on the front side of the periphery, that is, the side facing the rotary plate 16, are located at positions facing the ring grooves 21 and 22. It is formed.

Further, a part of the fixed plate 17 between the ring grooves 25 and 26, in this embodiment, a range of about 1/4 circumference is selectively communicated with any one of the exhaust holes 23 at a specific position. An exhaust hole 27 (outer ventilation hole) is provided in an arcuate shape for allowing exhaust gas from the exhaust duct 4 to pass through the exhaust pipe 14.

One of the exhaust holes 23 of the rotating plate 16 in this embodiment
Communication between the holes 27 and the exhaust holes 27 of the fixing plate 17 is performed only when one of the porous portions 2 of the coaching pan 1 and the exhaust duct 4 that covers the porous portions 2 from the outer peripheral side rotates to the lower position. It will be done. Therefore, the heated gas supplied into the coaching pan 1 from the air supply pipe 13 is heated inside the layer of tablets 6 when the porous section 2 and one of the exhaust ducts 4 are at the lower position and the exhaust holes 23 and 27 are in communication. through the porous part 2 to the exhaust duct 4 and the exhaust holes 23, 2.
7 and then exhausted to the outside of the system through an exhaust pipe 14 or recycled and reused.

A friction ring 28 constituting a rotational drive mechanism of the coaching pan 1 is fitted on the rear side (right side in FIG. 3) of the coaching pan 1, and the lower outer periphery of the friction ring 28 is in friction with the drive roller 29. are in contact. The drive roller 29 is driven by the motor 8 to drive the sprocket 8a, chain 9, and sprocket 8b.
It is rotated through the

On the other hand, on the front side (left side in FIG. 3) of the coaching pan 1, a rotating ring portion 30 is integrally formed with a slightly thick wall. The lower part of the rotating ring portion 30 is supported by a rotating roller 32 which is rotatably held by a bracket 31.

A fixed ring 3 is provided on the front side of the rotating ring section 30.
3 is disposed, and a lid 34 is attached to the front surface of this fixing ring 33 so as to be openable and closable.

A sealing portion is provided at the rotational connection between the rotating ring portion 30 and the fixed ring 33. This seal portion includes a seal ring 35 provided around the front end of the rotating ring portion 30, a seal ring 36 provided around the rear end of the fixed ring 33,
It is composed of a seal presser 37 that holds both seal rings 35 and 36, and reliably seals the rotational joint portion between the rotating ring portion 30 and the fixed ring 33. Like the seal rings 18 and 19, the seal rings 35 and 36 are made of a material such as fluororesin. The seal retainer 37 is made of metal such as stainless steel, and has ring grooves 38 and 3 that hold the seal rings 35 and 36, respectively, as shown in FIG.
9 on the inner peripheral surface.

A spray nozzle 40 for supplying the coating liquid into the pan is attached to the center of the lid 34 so as to extend above the tablets 6 in the coaching pan 1. However, the spray nozzle 40 may be attached so as to penetrate through the peripheral wall of the fixing ring 33, as shown by the two-dot chain line 40a in FIG.

Further, in this embodiment, inside the coaching pan 1, the front edge 41a is in line contact with the inner wall surface of the coaching pan 1 in the axial direction with respect to the rotation direction R of the coaching pan 1, and the rear edge 41a is in line contact with the inner wall surface of the coaching pan 1 in the axial direction. A scooping plate 41 having a ventilation opening 42 formed between the 41b and the inner wall surface of the coaching pan 1 is connected to the coaching pan 1.
It is arranged so as to completely cover the porous part 2 from the inside.

This scooping plate 40 serves as a support for the object to be coated, such as a tablet 6, which rolls along the inner wall surface of the coaching pan 1 as the coaching pan 1 rotates.
Or while scooping up other powder or granular materials with the front edge 41a and rolling them on the scooping plate 41,
It is allowed to fall under its own weight in a shearing manner into the flow of heated gas 43 passing through the ventilation opening 42 from the rear edge 41b.

In this embodiment, the scooping plate 41 has four porous portions 2 formed in the circumferential direction of the coaching pan 1.
One sheet is provided inside each of them. The front edge 41a and/or both side edges 41c of the scooping plate 41 are fixed to the inner wall surface of the coaching pan 1 by, for example, welding or the like.

Therefore, the front edge 41a of the scooping plate 41
Also, the tablets 6 are prevented from entering between the side edges 41c and the inner wall surface of the coaching pan 1 and leaking.

Next, the operation of this embodiment will be explained.

First, fixing ring 3 on the front of coaching pan 1
Open the lid 34 of the inlet of 3, put the tablet 6 which is the object to be coated into the coaching pan 1, and
The coaching pan 1 is rotated and a required coating liquid is sprayed into the coaching pan 1 by the spray nozzle 40. Thereby, a layer of coating material is formed around the tablets 6 rolling along the inner wall surface within the coaching pan 1 as the coaching pan 1 rotates.

After that, the air supply pipe 13 is connected to a heating gas source (not shown).
When heated gas is blown into the coaching pan 1 from the rear side of the coaching pan 1, the heated gas passes through the layer of tablets 6 after coaching,
Furthermore, the air is exhausted to the outside of the coaching pan 1 through the ventilation hole 2a (FIG. 9) of the porous portion 2 through the ventilation opening 42, and enters the exhaust duct 4.

In that case, one of the exhaust holes 23 of the rotary plate 16 and the exhaust hole 27 of the fixed plate 17, which are provided as ventilation paths on the way from the exhaust duct 4 to the exhaust pipe 14, Since one of the ducts 4 communicates only when it rotates below the coaching pan 1 , the heated gas is discharged only from the bottom area of the coaching pan 1 , and the tablets 6 rolling in the bottom of the coaching pan 1 . layers can be efficiently vented and dried.

In particular, in this embodiment, the air supply pipe 13 that supplies heated gas into the coaching pan 1 is
Since it is provided on the rear side, it improves the sealing performance on the front side of the coaching pan 1, increasing the degree of sealing inside the coaching pan 1, preventing outside air from entering the coaching pan 1, and heating. Hot air ventilation drying using gas can be performed efficiently, making it convenient for high-temperature processing.

In addition, operations such as loading the spray nozzle 40 from the front side of the coaching pan 1 and charging the raw material to be coated can be facilitated, and operability can be improved.

Furthermore, in this embodiment, since the outlet of the air supply pipe 13 is surrounded by the exhaust pipe 14 in a double pipe shape, the area around the outlet of the air supply pipe 13 comes into contact with the exhaust gas passing through the exhaust pipe 14. The residual heat can suppress a drop in the temperature of the supplied air, and further improve thermal efficiency.

Moreover, in this embodiment, the scooping plate 41 is disposed at a position covering the porous portion 2 in the coaching pan 1, and the front edge 41a and both side edges 41c of the scooping plate 41 are formed on the inner wall surface of the coaching pan 1. Since the tablets 6 rolling along the inner wall surface of the coaching pan 1 as the coaching pan 1 rotates, the tablets 6 are almost in contact with the front edge 4 of the scooping plate 41.
After being scooped up onto the scooping plate 41 at step 1a, the heated gas 43 rolling on the scooping plate 41 and passing through the ventilation opening 42 toward the porous portion 2 from the trailing edge 41b. In the flow, it flows down in a shearing motion like an avalanche due to its own weight.

As a result, each tablet 6 is brought into full contact with the flow of heated gas 43 passing through the ventilation opening 42 from the right angle direction, and is quickly and efficiently dried. Further, since the tablet 6 falls under its own weight while performing a shearing motion, there is no stagnation area in the rolling layer, and a uniform coating layer without protrusions or irregular shapes can be obtained. Further, by providing the scooping plate 41, it is possible to prevent clogging of the ventilation hole 2a of the porous portion 2 and a phenomenon of powder leakage during supply of powder raw material.

As shown in FIG. 10, the scooping plate 41 of this embodiment has a flat plate structure consisting of a front edge 41a, a rear edge 41b, and both side edges 41c, but a curved plate, a bent plate, etc. may also be used. .

In addition, since the sealing degree of the present invention is high, tablet 6
Not only can it streamline the usual coating and drying of raw materials to be coated, such as, but it can also be used for various high-temperature treatments such as roasting sunflower seeds and tea leaves. It is also convenient for processing in non-oxidizing or explosion-proof atmospheres.

Of course, the present invention can be applied to bread coaching apparatuses other than the double cone type, such as cylindrical, onion, or pair types.

Next, an example will be described in which the bread coaching apparatus of the present invention is compared with a conventional apparatus.

Example A nitrogen gas holder, a heat exchanger, a pan coating device of the present invention, a blower, and a condenser are connected by piping so that gas circulates in this order, and a tablet containing 5% cytochrome C, which is easily degraded by oxygen, is placed in the device of the present invention. After replacing the air in the equipment with nitrogen gas, the coating liquid was sprayed at a rate of 300 ml per minute, and nitrogen gas heated to 90°C with a heat exchanger was circulated at a rate of 20 Nm ³ /min. Ta.

As a comparative example, an experiment was conducted by connecting the conventional apparatus shown in FIG. 1 in place of the bread coating apparatus of the present invention in the system.

As a result, when the device of the present invention was used, there was almost no gas leakage and no replenishment of nitrogen gas was necessary, but when the conventional device was used, there was a large nitrogen leakage and air intrusion, and a considerable amount of cytochrome C was lost. It was disassembled.

When the content of cytochrome C was measured after the completion of coaching, 93% remained when using the device of the present invention, while 82% remained when using the conventional device.
I stayed there.

As explained above, according to the present invention, it is possible to increase the sealing degree of the rotating container, so more efficient ventilation drying is possible, there is no loss of spray liquid, and it is non-oxidizing or explosion-proof. It may also be possible to operate in a sexual atmosphere.

Furthermore, according to the present invention, since both the first and second ventilation pipes are located at the center of the rear surface of the rotary container, the radial dimension of the rotary container can be reduced, making it very simple. Thus, a pan coaching device with a streamlined structure can be obtained.

Furthermore, in the present invention, the peripheral wall including the ventilation hole of the rotating container is made of a cylinder, rectangular cylinder, cone, or pyramid-like surface without an inwardly convex portion, thereby reducing the amount of the raw material to be coated. It is possible to realize efficient pan coaching operation without having to do anything.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side sectional view of a conventional bread coaching device, FIG. 2 is a side sectional view of another conventional device, and FIG. 3 is a side sectional view of an embodiment of the bread coaching device according to the present invention. Figure 4 is a diagram showing the rear surface of the rotating plate, Figure 5 is a diagram showing the front surface of the fixed plate, Figure 6 is a cross-sectional view of the combination of the rotating plate and fixed plate, and Figure 7 is a cross-sectional view of the seal holder. 8 is a schematic front sectional view of the bread coaching apparatus of the present invention, FIG. 9 is an enlarged partial front sectional view of section A in FIG. 8, and FIG. 10 is a perspective view of a scooping plate. DESCRIPTION OF SYMBOLS 1... Coaching pan (rotating container), 2... Porous part (ventilation hole part), 2a... Ventilation hole, 4... Exhaust duct (ventilation duct), 6... Tablet, 13... Air supply pipe (first ventilation pipe), 14... Exhaust pipe (second ventilation pipe), 16... Rotating plate, 17... Fixed plate, 2
0...Air supply hole (center ventilation hole), 23...Exhaust hole (outer ventilation hole), 24...Air supply hole (center ventilation hole),
27... Exhaust hole (outer ventilation hole), 30... Rotating ring section, 33... Fixed ring, 34... Lid, 3
5, 36... Seal ring, 37... Ring presser, 40... Spray nozzle, 41... Scooping plate, 42... Ventilation opening.

Claims (1)

[Scope of Claims] 1. A rotary container in the form of a horizontal drum having a circumferential wall that does not have an inwardly convex portion, a ventilation hole portion formed at at least one location in the axial direction of the circumferential wall of the rotary container, and A ventilation duct that covers each of the pores from the outer peripheral surface side of the rotary container, and is connected to a central portion of the rear surface side in the axial direction of the rotary container, and supplies air to the rotary container or exhausts air from the rotary container. A first ventilation pipe, like the first ventilation pipe, can communicate with the rear end of any one or more of the ventilation ducts on the rear side in the axial direction of the rotating container,
a second ventilation pipe that exhausts air from the rotating container or supplies air to the rotating container through the ventilation duct; and a rear side of the rotating container, a rear end of the ventilation duct, and the first and second ventilation pipes. a center vent that is rotatably provided together with the rotary container between the connecting portions thereof, and communicates the central portion of the rear surface side of the rotary container with the first ventilation pipe; a rotary plate having outer ventilation holes arranged at predetermined intervals so as to communicate with the ventilation duct at a position corresponding to the rear end of the ventilation duct; a center vent communicating with the center vent of the rotary plate; and a center vent formed radially outward of the center vent, the outer side of the rotary plate only when the outer vent of the rotary plate is in a predetermined position. a fixed plate having an outer vent in communication with one or more of the vent holes to place one or more of the vent ducts in communication with the second vent pipe. 2. A patent characterized in that the first and second ventilation pipes are formed as a double pipe, with the second ventilation pipe surrounding at least a portion of the length of the first ventilation pipe. A bread coaching device according to claim 1. 3. The ventilation hole portion of the rotary container has a front edge side that is substantially in contact with the inner wall surface of the rotary container with respect to the rotation direction of the rotary container, and one or both of the rear edge side and the side edge side that are in contact with the inner wall surface of the rotary container. 2. A pan coaching device as claimed in claim 1, characterized in that it is covered by a scooping plate forming a ventilation opening therebetween.