JP2001079841A - Heating apparatus for powder granule - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drying apparatus for powder granule by which heating treatment of the powder granule can be performed in a short time and treating cycle can be efficiently shortened. SOLUTION: A preheating hopper 2 is formed as a double wall container structure consisting of an inside container part 12 and an outside container part 13 and hot air fed from a hot air inlet 64 is blown up into the inside container part 12 from an opening part 14. The inner wall face 69 of the inside container part 12 is heated with the hot air and powder granule is falling down on the inside container part 12 is heated by means of this inner wall face 69. In addition, the powder granule is blown up with the hot air and passes through a guide member 21 and is brought into contact with a filter member 22 and falls down on the inner wall face 69 again. As the result, the powder granule is rapidly heated by being repeatedly brought into contact with the inner wall face 69 and being repeatedly blown up with hot air in the preheating hopper 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for heating a granular material, and more particularly, to an apparatus for heating a granular material such as resin pellets.

[0002]

2. Description of the Related Art Conventionally, in the processing of molding resin pellets and the like, a drying step for reducing the water content of the resin pellets to a certain level is often included as one of the processing steps. As a drying apparatus used in such a drying step, for example, a hot air circulation type drying apparatus and the like are known.

[0003]

However, it is possible to reduce the water content of the resin pellets to a certain level by heating and drying using a hot air circulation type drying apparatus. It takes some time for drying, and it is not possible to efficiently shorten the processing cycle.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to enable a heat treatment of a granular material in a short time and to efficiently shorten a processing cycle. It is an object of the present invention to provide an apparatus for drying a granular material.

[0005]

In order to achieve the above object, the present invention according to claim 1 includes a heating tank for receiving a powdery or granular material, wherein the heating tank includes a powder received in the heating tank. An inner wall surface in which the granules fall down and come into contact with its own weight, a heating unit for heating the inner wall surface, and a blowing unit for blowing up the powder particles in contact with the inner wall surface, I have.

[0006] According to such a configuration, the granular material received in the heating tank falls by its own weight, comes into contact with the inner wall surface heated by the heating means, and is heated by contact with the inner wall surface. Then, it is blown up by blowing means. The blown-up granular material falls again by its own weight, comes into contact with the inner wall surface, and is heated again by contact with the inner wall surface. Therefore, the granular material is heated by repeating the contact with the inner wall surface and the blowing by the blowing means.

[0007] The invention described in claim 2 is the first invention.
In the invention described in the above, the heating tank has a double wall structure of an inner wall on which the inner wall surface is formed, and an outer wall provided at a predetermined distance from the inner wall so as to cover the inner wall. Is formed, the heating means includes a heating medium supply port for supplying a heating medium between the inner wall and the outer wall, and supplies the heating medium from the heating medium supply port, The heating medium passing between the inner wall and the outer wall is configured to heat the inner wall of the inner wall, and the blow-up means includes a lower part of the heating tank, the inner wall and the lower part. An opening communicating with the outer side wall is provided, and the heating medium that has passed between the inner side wall and the outer side wall is blown up from the opening toward the inside of the heating tank. I will blow up the granules with the heating medium It is characterized in that it is configured to.

According to such a configuration, the heating medium supplied from the heating medium supply port heats the inner wall surface of the inner wall while passing between the inner wall and the outer wall, and then reaches the opening. Then, it is blown up from the opening toward the inside of the heating tank. Therefore, the powder is blown up by the heating medium.

The invention described in claim 3 is the same as the invention in claim 2
In the invention described in the above, a heating medium outlet for discharging the heating medium blown up from an opening of the blowing means is formed in an upper portion of the heating tank, and a heating medium blown up from the opening is formed. A guide member for guiding the heating medium toward the heating medium discharge port is provided.

According to such a configuration, the heating medium blown up into the heating tank is guided to the heating medium outlet along the guide member, and is discharged from the heating medium outlet.

[0011] The invention described in claim 4 is the same as the claim 3.
In the invention described in the above, the heating medium outlet is provided with a filter member for preventing the granular material to be blown up from entering the inside of the heating medium outlet, and the filter member is configured to filter the granular material. A contact surface for dropping in a direction toward the inner wall surface is provided.

According to such a configuration, the blown-up particulate material contacts the contact surface of the filter member, and then falls again on the heated inner wall surface.

The invention described in claim 5 is the first invention.
In the invention described in any one of (4) to (4), a contact-type temperature sensor that detects a heating temperature of the granular material by contacting the granular material is provided in the heating tank. .

According to such a configuration, when a powder which has been repeatedly blown up and dropped contacts the contact type temperature sensor, the temperature of the powder is detected.

[0015] The invention described in claim 6 is the first invention.
The heating device according to any one of the first to fifth aspects is used as a preheating device for a drying device for a granular material.

According to such a configuration, the granular material is preliminarily heated in the heating device and then dried in the drying device.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram showing a granular material processing system provided with an embodiment of a granular material heating apparatus according to the present invention.

In FIG. 1, the system for treating powder and granules includes a drying device 1, a supply-side pneumatic transport unit 61 for pneumatically transporting the powder and granules supplied to the drying device 1, and a discharge device from the drying device 1. The granules are separated into other processing equipment (for example,
(A molding machine, a mixer, etc.) 39a and 39b.

In such a powder / particle processing system, for example, resin pellets are pneumatically transported from a raw material storage tank (not shown) to the drying apparatus 1 by the supply-side pneumatic transport unit 61, and a fixed amount of water is supplied to the drying apparatus 1. After drying to a molding machine 3
It is configured as a system that pneumatically transports to 9a and 39b by the processing side pneumatic transport unit 62.

The supply-side pneumatic transport unit 61 includes a supply pipe 20 connected to the upstream side of the drying device 1 and a supply pipe connected to the supply pipe 20 for transporting the granular material from a raw material storage tank (not shown). And a side ejector 19.

The processing-side pneumatic transport unit 62 has a transport pipe 38a connected downstream of the drying apparatus 1 for transporting the dried powder to the other processing apparatuses 39a and 39b.
And 38b, and transport-side ejectors 41a and 41 connected to the transport pipes 38a and 38b.
b. The other processing devices 39a and 3a
9b is provided with receivers 40a and 40b, respectively, and transport pipes 38a and 38b are connected to the receivers 40a and 40b, respectively.

The drying device 1 includes a preheating hopper 2 as a heating tank, and a preheating device 3 as a heating device.
And a reduced-pressure drying device 5 having a reduced-pressure drying hopper 4. The preheating hopper 2 and the reduced-pressure drying hopper 4 are connected by a joint 29.

The preheating device 3 includes a hot air blowing unit 63 connected to the preheating hopper 2, and the hot air blowing unit 63 is arranged downstream of the preheating hopper 2 in the order of the cyclone 6 and the drying filter 7. , A drying blower 8 and a drying heater 9.
A closed line that circulates hot air as a heating medium by being connected through 1a, 11b, 11c, 11d, and 11e (that is, the drying heater 9 is connected to the preheating hopper 2 through the blowing pipe 11e). )
The drying line 10 is formed.

As shown in FIG. 2, the preheating hopper 2 has an inner container portion 12 serving as an inner wall for receiving the granular material.
And the inner container portion 12 so as to cover the inner container portion 12.
And an outer container portion 13 as an outer wall formed at a predetermined interval.

The inner container portion 12 is formed of a material having a high specific heat, such as a metal (for example, stainless steel, iron, etc.), and has a cylindrical shape whose upper part is open, and its lower part is squeezed downward. An opening 14 is formed at the lower end for blowing out hot air during heating, and for discharging powder particles during discharging. The inner wall surface 69 of the inner container portion 12 has a vertical surface 69a formed along the vertical direction corresponding to the cylindrical shape.
And an inclined surface 69b formed so as to be converged downward from the vertical surface 69a in a conical shape.

The outer container 13 is also provided with the inner container 12.
Similarly to the above, the upper portion is formed in a tubular shape, the lower portion of which is formed to be squeezed downward, and the lower end portion thereof is formed with a discharge port 15 for discharging the granular material. ing. A joint 29 having an upper gate 16 is connected to the outlet 15. In addition, the outer container portion 13
A hot air inlet 64 serving as a heating medium supply port is opened at a side portion of the hot air inlet 64, and a blowing pipe 11 e connected to the heater 9 is connected to the hot air inlet 64.

An upper lid 65 is provided above the inner container part 12 and the outer container part 13 so as to cover these upper openings. The upper lid 65 has a supply-side pneumatic transport unit 61.
And a blower pipe 11a connected to the cyclone 6. The blower pipe 11a is connected to an opening 78 as a heating medium discharge port formed at the center of the upper lid 65, and the inside of the upper lid 65 at the opening 78 covers the opening 78. , A filter member 22. The filter member 22 is formed in a conical shape, and abuts powders and particles that are blown up along a guide member 22 described later, and drops the contacted powders in a direction toward the inner wall surface 69. Inclined contact surface 68 is provided.

Further, the supply pipe 20 is connected to an opening 79 opened to the side of the opening 78 to which the blower pipe 11a is connected. Further, the upper lid 65 includes
A contact-type temperature sensor 66 for detecting the heating temperature of the powder and granules by contacting the powder and granules is provided at a position lateral to an opening 78 to which the blower pipe 11a is connected.
The sixth detection piece 67 is provided so as to protrude into the inner container portion 12.

A cylindrical guide member 21 is provided at the center of the inner container portion 12 so as to extend in the vertical direction.

The lower gate 16 provided at the lower end of the preheating hopper 2 includes an upper guide member 71, a lower guide member 72, a slide gate 73, and an air cylinder 54. Thereby, the slide gate 73 is configured to slide horizontally between the upper guide member 71 and the lower guide member 72.

As shown in FIG. 1, a reduced-pressure drying device 5 is provided downstream of the reduced-pressure drying hopper 4
3, a decompression pump 24, a booster 44, and a mist separator 45, which are connected to each other via decompression pipes 25a, 25b, 25c, 25d to form a decompression line 26. I have.

An air release valve 37 is provided in the middle of a reduced pressure pipe 25a connecting the reduced pressure drying hopper 4 and the line filter 23, and connects the line filter 23 to the reduced pressure pump 24. Pressure reducing pipe 2
The middle of 5b is formed in a fin shape for heat dissipation. Further, a part of a pressure reducing pipe 25c connecting the pressure reducing pump 24 and the booster 44 is formed in a fin shape for releasing heat, and a relief valve 49 is provided in the middle thereof. .

The reduced-pressure drying hopper 4 is provided with a reduced-pressure container 27 for receiving the granular material, and a jacket 28 for keeping the reduced-pressure container 27 warm.

The decompression container 27 has a cylindrical shape whose upper part is open, and is formed so that its lower part is squeezed downward. The lower part has a discharge part for discharging powder and granules. A pipe 30 is connected. In this discharge pipe 30,
A lower gate 31 for opening and closing the discharge pipe 30 is provided, and a relief valve 42 is provided in the middle thereof. Note that a processing-side pneumatic transport unit 62 is connected to the discharge pipe 30.

An upper cover 74 for covering the upper opening is provided at the upper part of the decompression container section 27.
A joint 29 connected to the preheating device 3 and a pressure reducing pipe 25a connected to the line filter 23 are connected.

The jacket 28 is formed at a predetermined distance from the outer wall surface of the decompression container 27 so as to cover the outer peripheral side of the decompression container 27, and supplies the heat medium to the space at the predetermined distance. The jacket 28 is configured to be supplied with hot air from the drying line 10 of the preheating device 3 as a heating medium. That is, on the downstream side of the drying heater 9 in the drying line 10, the inlet pipe 33 is branched from the middle of the blower pipe 11 e connecting the preliminary heating hopper 2 and the drying heater 9, and the inlet pipe 33 is From the drying filter 7 disposed upstream of the drying heater 9, an outlet pipe 34 different from the blower pipes 11 b and 11 c is branched.
To the jacket 28 from the side,
A jacket supply line 32 is formed, a supply valve 35 is provided in the middle of an inlet pipe 34 of the jacket supply line 32, and hot air is sent into the jacket 28 by opening and closing the supply valve 35.

The depressurizing pump 24 is an oscillating pump, and is configured to suck air from the inside of the depressurizing drying hopper 4 through the depressurizing pipes 25a and 25b and compress the air. The booster 44
The air compressed by the decompression pump 24 is further compressed. For example, the air compressed by the decompression pump 24 is further compressed about twice. The mist separator 45 traps and discharges dust that has been condensed and liquefied by the compressed air from the compressed air.

In the drying apparatus 1, the preheating hopper 2, the reduced-pressure drying hopper 4, the drying blower 8 and the drying heater 9 are covered with a heat insulating material 17.

Then, the drying apparatus 1 configured as described above
In order to dry the granular material by heating, first, the preliminary heating device 3 performs heating and drying. In order to perform heating and drying by the preliminary heating device 3, first, the upper gate 16 is closed, and the drying blower 8 is operated. Then, air is sent from the drying blower 8 to the drying heater 9 via the blowing pipe 11d, and the hot air heated by the drying heater 9 flows from the hot air intake port 64 of the preliminary heating hopper 2 via the blowing pipe 11e. It is sent to the space between the inner container part 12 and the outer container part 13. (The flow of the hot air is indicated by an arrow 75 in FIG. 2.) Then, the inner wall surface 69 of the inner container portion 12 is heated by the hot air. Then, after passing through the space between the inner container part 12 and the outer container part 13, the hot air is blown up into the inner container part 12 from the opening 14 formed at the lower end of the inner container part 12. . (This flow of hot air is indicated by arrow 7 in FIG. 2)
6. The hot air blown up toward the inside of the inner container portion 12 flows along the inner peripheral wall of the guide member 21,
After passing through the inside of the guide member 21 in the up-down direction, the air is blown from the opening portion 78 to the blowing pipe 11 a via the filter member 22.

Next, by operating the supply-side ejector 19, the granular material is removed from the supply pipe 20 through the opening 7.
9 into the inner container part 12. Then, the granular material falls by its own weight, comes into contact with the inner wall surface 69, particularly the inclined surface 69b, which is heated by the hot air, and is heated by contact with the inclined surface 69b. And
The granular material on the inclined surface 69 further descends by its own weight while being heated while being in contact with the inclined surface 69, and when reaching the opening 14, hot air blown up from the opening 14 into the inner container 12. Is blown up. (The flow of the granular material is indicated by an arrow 77 in FIG. 2.) The granular material blown up by the hot air flows along the inner peripheral wall of the guide member 21 while being heated by the hot air. After passing through the inside of the filter member 22 in the vertical direction, the filter member 22 comes into contact with the contact surface 68 of the filter member 22, and is prevented from entering the opening portion 78. Or falls again on the inclined surface 69b. (The flow of the granular material is indicated by an arrow 80 in FIG. 2.) The granular material that has fallen on the inclined surface 69b again contacts the inclined surface 69b and is heated by its own weight while being heated. When it further descends and reaches the opening 14, it is blown up again by the hot air blown up from the opening 14, whereby the contact with the inner wall surface 69 of the inner container 12 and the operation of blowing up by the hot air are repeated. . (The repetitive operation of this powder is indicated by arrows 77 and 80 in FIG. 2.) As a result, the preheating hopper 2
Inside, the granular material is rapidly heated by contact with the inner wall surface 69 and blowing up by the hot air from the opening 14. Therefore, according to such a pre-heating device 3, the granular material can be heated in a short time, and the processing cycle can be efficiently shortened.

The preheating device 3 has an inner wall 69
Since the heating of the powder and the blowing of the granular material are performed by the hot air circulating together, it is possible to simplify the apparatus configuration, and it is possible to save labor for the heating and the blowing. Cost and running cost can be reduced.

Further, in the preheating device 3, the guide member 21 provided in the preheating hopper 2
Since the blown-up powder is well guided together with the hot air, a good blowing operation of the powder can be ensured, and the blown-up powder is brought into contact with the contact surface 68 by the filter member 23. Thus, it is possible to satisfactorily drop on the inner wall surface 69. Therefore, an efficient repetitive operation of the granular material can be secured, and more efficient heating can be achieved.

Therefore, for example, when a conventional hot air circulation type drying apparatus is used for preheating, a heating time of, for example, 10 minutes or more was required.
For example, it can be heated well in about 1 to 3 minutes.

Then, by the contact type temperature sensor 66,
When it is detected that the granular material has been heated to a predetermined temperature, the upper gate 16 is opened, and the granular material is supplied to the reduced-pressure drying device 5. The heating temperature of the granular material is detected when the granular material that has been repeatedly blown up and dropped contacts the detection piece 69. Therefore, for example, the heating temperature of the granular material can be detected more accurately than a method of detecting the heating temperature by detecting the ambient temperature in the preheating hopper 2. Moreover, since the powder and the granular material are repeatedly blown up and dropped, they are uniformly contacted with the detecting piece 69 without bias, so that accurate detection can be achieved. If the contact-type temperature sensor 66 is configured so as to be movably fixed in the up-down direction, it is also used as a level meter for detecting the amount of the granular material received in the inner container 12. be able to.

The hot air sent to the blower pipe 11a is:
As shown in FIG. 1, after flowing into the cyclone 6 connected to the blowing pipe 11a and removing dust and the like, the dust and the like are sent to the drying filter 7 through the blowing pipe 11b, and further dust and the like are removed. Thereafter, the air is sent to the drying blower 8 again through the air supply pipe 11c. The hot air containing moisture in the inner container portion 12 is released to the outside air by, for example, partially opening it to the atmosphere by a cyclone 6 or a drying filter 7, and, on the other hand, from the outside air. The low-humidity air is taken in to prevent the circulating hot air from rising in humidity.

Next, the powder and granules that have been heated and dried in the preheating device 3 are further sufficiently dried by the reduced pressure drying device 5. In order to perform drying by the reduced-pressure drying device 5, first, when the drying blower 8 of the preheating device 3 is operated, the supply valve 35 is opened, and the jacket 28 is inserted from the middle of the ventilation pipe 11e through the inlet pipe 33.
Hot air is sent into the inside of the container, thereby keeping the inside of the decompression container unit 27 warm. The hot air that has flowed into the jacket 28 flows out of the drying filter 7 through the outlet pipe 34 and merges with the drying line 10 again. The opening and closing operation of the supply valve 35 may be performed continuously or intermittently as appropriate according to the heat retention state in the decompression container 27.

Next, the lower gate 31 is closed.
The upper gate 16 is opened to receive the granular material into the reduced pressure container 27, and then the upper gate 16 is closed again to operate the reduced pressure pump 24. Then, the pressure in the decompression container 27 is reduced through the decompression pipes 25a and 25b, and the powder and granules received in the decompression container 27 are dried under reduced pressure. The capacity of the pressure reducing pump 24 is
7 and the type and size of the powder and granules may be appropriately selected, for example, 40 to 100 Torr.
Some are used.

Further, the pressure reducing pump 2
The air sucked by 4 flows into the line filter 23 through the decompression pipe 25a, and after dust and the like are removed, is sent to the decompression pump 24 through the decompression pipe 25b. The air sent to the decompression pump 24 is pressurized by the decompression pump 24, sent to the booster 44 via the decompression pipe 25c, further compressed by the booster 44, and further compressed by the mist separator 45 via the decompression pipe 25d. Sent to As a result, the condensed and liquefied dust is trapped by the mist separator 45, and only clean air is discharged to the pressurizing pipe 47 described later. The liquefied dust may be discharged from the mist separator 45.

As described above, if the pre-heating device 3 is dried by heating and then dried under reduced pressure by the reduced-pressure drying device 5, the powder and granules previously heated in the pre-heating device 3 in a short time can be dried. 5, the drying can be shortened as a whole, and the processing cycle can be shortened more efficiently. In addition, in this drying apparatus 1, the temperature of the depressurized container 27 is maintained by the jacket 28, so that even if the granular material dried in the preheating device 3 is supplied to the depressurized container 27, the temperature is maintained. It is dried under reduced pressure as it is. Therefore, the granules can be dried more quickly and sufficiently. Further, in the drying device 1, the jacket supply line 3 is connected to the drying line 10 of the preheating device 3 in the jacket 28.
Since the hot air is supplied via the heating device 2, there is no need to separately supply a heat medium, and there is no need for equipment for supplying the heat medium. Cost and running cost can be reduced.

Further, the pressure reducing pump 2
4 is pressurized by the decompression pump 24 and the booster 44, and a part of the air is condensed.
By trapping by 5, the clean air alone can be discharged toward the pressurizing pipe 47 described later.

After the drying under reduced pressure is sufficiently performed by the reduced-pressure drying device 5, the air release valve 37 is opened, and the lower gate 31 is opened to discharge the powdery material in the reduced-pressure container 27 from the discharge pipe 30. Then, when the discharge of the granular material is completed, the air release valve 37 and the lower gate 31 are closed, and the drying under reduced pressure is ended. The particles discharged from the discharge pipe 30 are transported by the transport-side ejectors 41a and 41b of the processing-side pneumatic transport unit 62 through the transport pipes 38a and 38b, respectively.
0b.

The drying apparatus 1 is provided with a vacuum pump 24
And an air supply unit 43 for using the air compressed by the booster 44 as a power source.

The air supply unit 43 includes an air tank 46, an electromagnetic valve 51, and pressure sending pipes 50a, 50b, 50
c, 50d, and 50e. The air tank 46 is
The electromagnetic valve 51 is connected to the mist separator 45 via the pressurizing pipe 47 and the air tank 46 via the compressed air supply pipe 52. In addition, the transmission pressure pipe 5
Oa, 50b, 50c, 50d, and 50e have one end connected to the electromagnetic valve 51 and the other end connected to the supply-side ejector 19, the upper gate 16, the lower gate 31, and the transport-side ejectors 41a and 41b, respectively. It is connected to the. In the middle of the compressed air supply pipe 52,
An air filter 53 is provided.

The air tank 46 stores the compressed air, and the electromagnetic valve 51 is provided with a pressure transmitting pipe 50a,
It is configured so that it can be opened and closed corresponding to each of 50b, 50c, 50d, and 50e.

In such an air supply unit 43, the air compressed by the decompression pump 24 and the booster 44 is sent from the mist separator 45 to the air tank 46 via the pressurizing pipe 47 and is stored in the air tank 46. When the supply-side ejector 19, the upper gate 16, the lower gate 31, and the transport-side ejectors 41a and 41b are respectively operated, the corresponding electromagnetic valve 51 is opened. Then, the corresponding pressure sending piping 50a, 50b, 50c, 50d, 5
Compressed air is sent to each via 0e, thereby operating the supply-side ejector 19, the upper gate 16, the lower gate 31, and the transport-side ejectors 41a and 41b, respectively. The upper gate 16 and the lower gate 31 are provided with air cylinders 54 and 55, respectively.
By sending the compressed air through the pressure sending pipes 50b and 50c, the upper gate 16 and the lower gate 31 are opened and closed, respectively.

Accordingly, by providing such an air supply unit 43, the air sucked by the decompression pump 24 is used as compressed air (power source) as a transport system such as the supply-side ejector 19 and the transport-side ejectors 41a and 41b. , And the driving system such as the upper gate 16 and the lower gate 31 can efficiently use the air sucked by the pressure reducing pump 24 without providing a separate power source. Thus, an efficient processing system capable of saving energy can be configured.

The compressed air sent from the mist separator 45 to the air supply unit 43 is supplied from the air supply unit 43 to the supply side ejector 19 and the upper gate 1.
6, lower gate 31, transport-side ejectors 41a and 4
After being supplied to the mist separator 1b, the air is exhausted. Since the exhausted air is clean air from which dust is removed by the mist separator 45, a favorable working environment is secured without impairing the environmental atmosphere. can do.

The electromagnetic valve 51 is connected to the air tank 46.
Depending on the internal pressure and the like, a plurality of valves may be opened simultaneously or selectively or simultaneously. A power source may be separately provided depending on the capacity of the air tank 46 and the like.

In the embodiment described above, the heating means is
Hot air blowing unit 63, inner container part 12, outer container part 1
3 and a hot air inlet 64, and the blowing means is
Although an opening 14 is further added to this configuration, in the present invention, the heating means can heat the inner wall surface 69, for example, by providing a heater in the inner container portion 12 to heat the inner wall surface 69. Any means may be used, and the blowing means may be any means that can blow up the granular material, such as arranging a compressor or the like to blow up the granular material. Further, these heating means and blowing means may be provided separately and independently. However, if the configuration is such that the hot air is circulated as in the hot air blowing unit 63 of the present embodiment, efficient heating can be achieved.

Further, in this embodiment, the inner wall surface 69 of the inner container portion 12 is provided with a vertical surface 69a and an inclined surface 69b.
However, the inner wall surface of the present invention is not limited to these shapes, and may have any shape as long as the powder can contact the powder.

The pre-heating device 3 includes a reduced-pressure drying device 5
The present invention is not limited to this, and can be attached to any of known drying devices such as a hot air circulation type drying device and a dehumidifying drying device. Further, the heating device of the present invention is not limited to the preliminary heating device 3, and can be used in any process of heating the powder.

The type of the granular material is not limited, for example, such as resin pellets and ceramic particles, but the preheating device 3 is preferably used for heating the granular material such as resin pellets. Furthermore, the heating medium can be appropriately selected depending on the purpose and use thereof, for example, nitrogen gas and the like in addition to air.

[0063]

As described above, according to the first aspect of the present invention, the granular material is heated by repeating contact with the inner wall surface and blowing up by the blowing means. Therefore, the powder can be heated in a short time,
The processing cycle can be shortened efficiently.

According to the second aspect of the present invention, since the granular material is blown up by the heating medium, it is heated not only by the contact with the inner wall surface but also by the blowing up, so that the heating time is further shortened. be able to.

Further, since both the heating of the inner wall surface and the blowing up of the granular material can be performed by a heating medium, the structure of the apparatus can be simplified, and the labor for heating and blowing up can be reduced. Therefore, the cost and running cost of the apparatus can be reduced.

According to the third aspect of the present invention, the heating medium is favorably guided from the lower part to the upper part by the guide member in the heating tank. , Is well guided with the heating medium. Therefore, a favorable blowing operation of the powder can be ensured, and more efficient heating can be achieved.

According to the fourth aspect of the present invention, the blown-up powder particles are brought into contact with the contact surface by the filter member, and are favorably dropped onto the inner wall surface without being discharged from the heating medium discharge port. Can be done. Therefore, an efficient repetitive operation of the granular material can be secured, and more efficient heating can be achieved.

According to the fifth aspect of the present invention, the temperature of the particulate material is detected by directly contacting the contact type temperature sensor with the particulate material which has been repeatedly blown up and dropped. In addition, the heating temperature of the granular material can be more accurately detected as compared with the method of detecting the heating temperature by detecting the ambient temperature in the heating tank. Moreover, since the powder and the granular material are repeatedly blown up and dropped, they uniformly contact the contact-type temperature sensor without bias, so that the detection can be performed with high accuracy.

According to the sixth aspect of the present invention, the granular material heated in a short time in the heating device can be dried in the drying device, so that the entire drying process can be shortened. As a result, the processing cycle can be more efficiently reduced.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a granular material processing system including an embodiment of a granular material heating apparatus according to the present invention.

FIG. 2 is a cross-sectional view of a main part of a preheating device of the granular material processing system shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drying device 2 Preheating hopper 3 Preheating device 12 Inner container part 13 Outer container part 14 Opening 21 Guide member 22 Filter member 63 Hot air blowing unit 64 Hot air inlet 68 Contact surface 66 Contact temperature sensor 69 Inner wall surface 69a Vertical Wall 69b Inclined wall 78 Opening

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L113 AA03 AB04 AC45 AC48 AC49 AC67 BA02 CA04 DA02 DA10 DA17 DA25 4F201 AC01 AC04 AK01 AP05 AQ03 BA04 BC02 BC12 BC19 BN05 BN21 BN24 BN25

Claims (6)

[Claims] 1. A heating tank for receiving a granular material, wherein the heating tank heats the inner wall surface with which the granular material received in the heating tank falls by its own weight and comes into contact. And a blowing means for blowing up the granular material in contact with the inner wall surface. 2. The heating tank is formed as a double-walled structure having an inner wall on which the inner wall is formed, and an outer wall provided at a predetermined distance from the inner wall so as to cover the inner wall. Wherein the heating means has a heating medium supply port for supplying a heating medium between the inner wall and the outer wall, and supplies the heating medium from the heating medium supply port; The heating medium passing between the inner wall and the outer wall is configured to heat the inner wall of the inner wall, and the blow-up means is provided at a lower portion of the heating tank, the inner wall and the outer wall. An opening communicating with the wall is provided, and the heating medium that has passed between the inner side wall and the outer side wall is blown up from the opening toward the inside of the heating tank. It is configured to blow up the granular material by the medium It is characterized in that that the heating device of the granular material according to claim 1. 3. A heating medium outlet for discharging a heating medium blown up from an opening of the blow-up means is formed in an upper portion of the heating tank, and the heating medium blown up from the opening is formed by the heating medium. The heating apparatus for a granular material according to claim 2, further comprising a guide member for guiding the heating medium toward the heating medium discharge port. 4. The heating medium discharge port is provided with a filter member for preventing powder and granules to be blown up from entering the heating medium discharge port, and the filter member removes the powder and granules from the heating medium discharge port. The heating device for a granular material according to claim 3, further comprising a contact surface for dropping in a direction toward the inner wall surface. 5. A contact type temperature sensor for detecting a heating temperature of a granular material by contacting the granular material in the heating tank, wherein the contact type temperature sensor is provided in the heating tank. A heating device for a granular material according to any one of the above. 6. The heating device for a granular material according to claim 1, which is used as a preheating device for a drying device for the granular material.