JP2013221636A - Device for drying powder and granular material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for drying powder and granular material capable of improving efficiency of drying.SOLUTION: A device 1 for drying powder and granular material includes: a drying tank 10 for storing the powder and granular material therein; a heater 25 for heating at least a portion of gas supplied in the drying tank; a gas supply part 30 for supplying gas in the drying tank to circulate a part of the gas in the drying tank; and an exhaust part 16 for exhausting residual gas in the drying tank. The gas supply part includes a gas reception port 33 connected to a compression gas source 2; a gas supply port 38 for supplying the gas toward the inside of the drying tank; a gas introduction part 37 in communication with a gas passage 34 from the gas reception port to the gas supply port, and formed to nearly directly introduce the gas in the drying tank; and an aperture part 35 formed in the gas passage to introduce the gas in the drying tank via the gas introduction part with introduction of compression gas from the gas reception port.

Description

  The present invention relates to a drying apparatus for a granular material provided with a drying tank for storing the granular material.

2. Description of the Related Art Conventionally, a drying apparatus that supplies heated gas to a drying tank such as a hopper that stores powder material and dries the powder material in the drying tank is known. As such a drying apparatus, a so-called aeration-type drying apparatus is known in which outside air taken in by a blower or the like is heated by a heater box, supplied to the lower end portion in the drying tank, and exhausted from the upper end of the drying tank. In such a ventilating dryer, there is a tendency that a relatively large air volume is required, and the heater tends to be enlarged accordingly, and further improvement has been desired.
For example, Patent Document 1 below proposes a drying apparatus that includes a dryer main body that accommodates a drying target and an air supply device that supplies dry air to the dryer main body. The air supply device of this drying device is provided with a dehumidifying device, an injector and a heater in this order in the air supply passage that guides the flow of dry air pressurized and fed from the compressor to the dryer main body. The derived dry exhaust return passage is connected. As a result, in this drying apparatus, the drying energy in the return passage is circulated and flowd between the dryer body and the injector with the flow energy of the pressurized dry air ejected from the nozzle of the injector. Yes.

Japanese Patent No. 3453519

  However, the drying apparatus described in Patent Document 1 has a configuration in which an exhaust port of a dryer main body and an inlet of an injector are connected via a return passage disposed in a side portion of the dryer main body. Therefore, it is considered that the temperature of the dry exhaust from the dryer main body falls in the return passage, and further improvement has been desired.

  This invention is made | formed in view of the said situation, and aims at providing the drying apparatus of the granular material which can improve drying efficiency.

  In order to achieve the above object, a drying apparatus for a granular material according to the present invention includes a drying tank that stores the granular material, and a heater that heats at least a part of the gas supplied into the drying tank. And a gas supply part that supplies gas into the drying tank so as to circulate a part of the gas in the drying tank, and an exhaust part that exhausts surplus gas in the drying tank, The gas supply unit communicates with a gas reception port connected to a compressed gas source, a gas supply port for supplying gas toward the inside of the drying tank, a gas passage from the gas reception port to the gas supply port, and A gas intake part provided to take in the gas in the drying tank almost directly, and a gas in the drying tank through the gas intake part with the introduction of compressed gas from the gas receiving port And a throttle portion formed in the gas passage so as to take in It is characterized in.

Here, the above-mentioned powder material refers to a powder / granular material, and includes fine flakes, short fiber pieces, sliver-like materials, etc., such as resin pellets and resin fiber pieces. Such materials as synthetic resin materials, metal materials, semiconductor materials, wood materials, chemical materials, food materials, etc. that require heat drying treatment.
Moreover, as a granular material, when molding a synthetic resin molded product, for example, a natural material (virgin material), a pulverized material, a master batch material, various additives, and the like can be given.

In the present invention, the heater may be provided so as to heat the compressed gas supplied to the gas receiving port of the gas supply unit.
Moreover, in this invention, you may make it arrange | position the gas intake part of the said gas supply part in the said drying tank.
Further, in the present invention, the drying tank is provided with a cylindrical accommodating portion that opens toward the drying tank, and the gas intake portion of the gas supply unit is disposed in the cylindrical accommodating portion. May be.
Further, in the present invention, the gas supply unit is a cylindrical body provided with the gas receiving port at one end and the gas supply port at the other end, and the gas intake unit is provided on the outer periphery thereof. A plurality of gas inlets may be provided so as to communicate with the gas passage.
Further, in the present invention, the heater is an elongated tube provided with an elongated gas ventilation path and a linear heater disposed along the longitudinal direction in the gas ventilation path, and the gas supply You may make it provide in the outer peripheral side of a part helically along the circumferential direction.
Further, in the present invention, the gas tank is provided so as to extend up and down substantially at the center in the drying tank, and has a gas discharge port for discharging gas at the lower end in the drying tank at the lower end while the gas at the upper end. It is good also as what further provided the gas ventilation pipe to which a supply part is connected detachably.
In the present invention, a flow meter for detecting the flow rate of the compressed gas supplied to the gas receiving port of the gas supply unit, and a control unit for controlling the heater based on the detection value of the flow meter, Further, it may be provided.

  In the present invention, a flow rate adjusting unit for adjusting the flow rate of the compressed gas may be provided upstream of the gas receiving port of the gas supply unit connected to the compressed gas source. In this case, a detection means for detecting a predetermined control factor indicating the heating and drying processing state of the granular material in the drying tank is provided, and the flow rate adjustment section is controlled by the control section based on the detection value of the detection section. And you may make it increase / decrease the flow volume of the compressed gas supplied so that it may become a flow volume suitable for the heat drying process of the granular material material made with the said apparatus. For example, when the detection value of the detection means exceeds a predetermined threshold value set in advance, the flow rate of the compressed gas is decreased. On the other hand, when the detection value falls below the threshold value, the flow rate of the compressed gas is increased. You may make it control the said flow volume adjustment part. Moreover, as said control factor, the various physical quantity which fluctuates as the granular material in a drying tank is heat-dried is mentioned, For example, time, temperature, humidity (dew point), etc. are mentioned. And as a detection means which detects these control factors, what is necessary is just to be able to detect the fluctuation | variation of these physical quantities.

  The drying apparatus for the granular material according to the present invention has the above-described configuration, so that the drying efficiency can be improved.

It is a schematic block diagram which shows typically an example of the drying apparatus of the granular material which concerns on one Embodiment of this invention. FIG. 2 is a partially omitted schematic front view corresponding to a portion X in FIG. 1. (A) is a partially exploded schematic front view schematically showing an example of a heater and a gas supply unit provided in the drying device, and (b) is a partly omitted view corresponding to the YY line arrow in FIG. It is a schematic cross-sectional view. It is a partially broken schematic block diagram which shows typically an example of the drying apparatus of the granular material which concerns on other embodiment of this invention. It is a partially broken schematic block diagram which shows typically an example of the drying apparatus of the granular material which concerns on other embodiment of this invention. It is a partially broken schematic block diagram which shows typically an example of the drying apparatus of the granular material which concerns on other embodiment of this invention. It is a partially broken schematic block diagram which shows typically an example of the drying apparatus of the granular material which concerns on other embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, FIG. 3A, and FIGS. 4 to 6, a part of a pipe (gas pipe) through which a gas is circulated is schematically shown by a solid line.
Moreover, in FIG. 1, FIG. 4-7, a part of detailed code | symbol is abbreviate | omitted and it has permeate | transmitted and shown one part component.

1-3 is a figure which shows typically the drying apparatus of the granular material which concerns on 1st Embodiment.
As shown in FIG. 1, the powder material drying apparatus 1 according to the present embodiment supplies a hopper 10 as a drying tank in which the powder material is stored, a heater 25 that heats the gas, and a gas. The gas supply part 30 to perform and the control panel 4 are provided.
In the example shown in the figure, the hopper 10 and the control panel 4 are installed in a machine base 3 that is framed, for example, and has casters at the bottom. In addition, it is good also as an aspect installed instead of the aspect which installs the control panel 4 in the machine base 3 so that it may attach to the outer periphery of the hopper 10, etc.

The upper part of the hopper 10 has a cylindrical shape and the lower part has an inverted conical shape (see also FIG. 3B). Moreover, the upper end opening of the hopper 10 is sealed with a lid 15 so as to be opened and closed, and a discharge port 13 for discharging the powder material is provided at the lower end of the hopper 10.
The lid 15 is fixed to the upper end portion of the hopper 10 so as to be freely opened and closed by a fastener such as a fastener fitting. Note that a seal member may be disposed along the periphery of the hopper 10 where the upper end opening is in contact with the lid 15. Further, as an aspect in which the lid 15 can be freely opened and closed, it may be an aspect in which the lid 15 is connected to the upper end portion of the hopper 10 so as to be opened and closed by a connecting tool such as a hinge.
Moreover, in this embodiment, the cylindrical part 11 of the upper side made into the cylindrical shape of the hopper 10 and the inverted cone part 12 of the lower side made into the reverse cone shape are made into separate bodies, and fastener fasteners etc. are fastened. The example which connected these cylindrical part 11 and the reverse cone-shaped part 12 so that contact and separation were possible is shown.
The cylindrical portion 11, the inverted conical portion 12, and the lid 15 of the hopper 10 may be made of a metal material such as stainless steel or aluminum, or may be made of tempered glass or the like. Good.

Further, the hopper 10 is provided with an exhaust part 16 for exhausting excess gas in the hopper 10. In the present embodiment, an example is shown in which an opening that allows the inside and outside of the hopper 10 to communicate with the lid 15 is provided, and the exhaust portion 16 is provided to the lid 15 so as to communicate with the opening. The exhaust unit 16 is provided with a filter that captures dust, dust, and the like contained in the air discharged from the hopper 10. Instead of providing the exhaust part 16 on the lid 15, the exhaust part 16 may be provided on the upper end of the cylindrical part 11 of the hopper 10.
Further, in the present embodiment, from the viewpoints of cleanability and maintainability, an example in which the cylindrical portion 11, the inverted conical portion 12, and the lid body 15 of the hopper 10 are separated from each other is shown. All or part of them may be integrally formed.
Moreover, you may make it provide the outer periphery heat insulation part which heat-retains or heats the outer peripheral wall of the said hopper 10 in the outer periphery of the hopper 10. FIG. As such a hopper outer periphery heat retaining section, a configuration in which various foam type (foaming type) heat insulating materials, fiber heat insulating materials, resin heat insulating materials and the like are provided, or a heater such as a band heater is used as the hopper 10 may be provided on the outer periphery, and a heat insulating material may be provided on the outer periphery.

Further, the hopper 10 may be provided with a material sensor (level meter) for detecting the material level of the granular material stored in the hopper 10. As such a material sensor, the limit switch is turned ON / OFF by swinging of the arm portion depending on the presence / absence of the granular material, so that the material level in the hopper 10 is full or up to a predetermined level. It is good also as what was made into the aspect which detects whether it fell. Alternatively, an electrostatic capacity type upper limit sensor that detects that the material level in the hopper 10 is full, or an electrostatic capacity type lower limit sensor that detects that the material level in the hopper 10 has decreased to a predetermined level. Etc. may be provided.
Moreover, you may make it provide the material injection | throwing-in part which inputs a granular material material in the hopper 10 in the upper end part of the hopper 10. FIG. As such a material input part, it is equipped with a collector that collects a granular material transported via a material air transport pipe from a material storage part such as a material storage tank that stores the granular material. It is good.

In the drying apparatus 1 including the material sensor and the material input unit as described above, for example, based on the material request signal from the material sensor (lower limit sensor), the control of the CPU 4a as the control unit provided in the control panel 4 The collection and input operations may be executed as follows.
When a material request signal (OFF signal) is output from the material sensor (lower limit sensor), the air source for material transportation such as a suction blower is driven, and the granular material stored in the material reservoir is transported by material air. Transport through tube to collector. You may make it collect the granular material material pneumatically conveyed in this collector, and throw it into the hopper 10. The air transportation of the particulate material to the collector may be stopped based on a material presence signal from a sensor (upper limit sensor) that detects a full level, and a predetermined transportation time. If it passes, it is good also as an aspect stopped by stopping the air source for material transportation. In addition, opening / closing means such as a sliding valve device and a flap damper are provided at the lower part of the collector, and the particulate material collected in the collector is put into the hopper 10 by controlling the opening / closing thereof. It is good also as an aspect.
In addition, as a pneumatic transportation mode of the granular material, a mode of pneumatic transportation by suction or a mode of pneumatic transportation by providing a compressed air source as a material transportation air source and pneumatic transportation. Further, the material transportation air source may be provided in the machine base 3.

Further, as a mode in which a material discharge part is provided at the lower end of the hopper 10 and the granular material discharged from the material discharge part is transported to a forming machine or a processing machine as a supply destination via an air transport pipe or the like. Also good. As such a material discharging unit, any material may be used as long as it is connected to the CPU 4a through a signal line or the like and is controlled to be discharged (operation control or opening / closing control). A damper, a rotary valve, a flap damper, a slide damper, a screw feeder, or the like may be used. Or you may make it employ | adopt as a material discharge | emission part the measurement (mass) damper which fixed the measurement container to the slide damper and enabled the measurement of the transport amount of a granular material.
In addition, it is provided with a supply side collector that collects the particulate material pneumatically transported from the material discharge unit and supplies it to a molding machine, a processing machine, and the like. You may make it provide an electrostatic capacitance type supply side material sensor (lower limit sensor) etc. which detect that the material level fell to the predetermined level in the injection pipe.

In the drying apparatus 1 including the material discharge unit and the supply side material sensor as described above, for example, based on the material request signal from the supply side material sensor (lower limit sensor), the CPU 4a controls the following. The discharging and transporting operations may be executed.
When a material request signal is output from the supply side material sensor, the material discharge unit is opened (or activated), and a material transportation air source such as a suction blower is driven to store the granular material stored in the hopper 10. The material may be transported toward the supply side collector via the pneumatic transport pipe. And you may make it supply the granular material material collected in the supply side collector to a molding machine, a processing machine, etc.

In addition, in the case where the collection and charging operations in the material charging unit and the discharging and transporting operations in the material discharging unit are controlled at different timings, the hopper 10 of the drying device 1 You may make it share the air source for material transportation to the collector provided in an upper side, and the air source for material transportation to the supply destination side collector as a supply destination.
Further, the particulate material discharged from the hopper 10 is not limited to a mode in which the powder material is pneumatically transported toward the supply destination. Alternatively, it may be installed via a temporary storage hopper or the like, and the particulate material may be supplied toward the supply destination by its own weight.
Further, the particulate material stored in the hopper 10 is not limited to a mode in which a predetermined amount is discharged according to a request from a supply destination such as a resin molding machine, and the entire amount may be discharged at a time.

Further, in the present embodiment, a temperature sensor (material layer passage temperature detection sensor) 6 as a detecting means for detecting the temperature of the gas that has passed through the granular material layer stored in the hopper 10 is provided above the hopper 10. Provided.
In the present embodiment, the material layer passing temperature detection sensor 6 is configured so that the powder material stored in the hopper 10 is stored up to a full level from the uppermost layer portion of the powder material. Is arranged so that the detection part faces the space up to the lid 15 that seals the upper end of the cover. That is, the material layer passing temperature detection sensor 6 is configured to measure the ambient temperature in the space above the granular material layer stored in the hopper 10 (material non-reserving space).
The material layer passage temperature detection sensor 6 is connected to the CPU 4a via a signal line or the like. In the illustrated example, the material layer passing temperature detection sensor 6 is provided so as to penetrate the cylindrical portion 11 of the hopper 10. However, the material layer passing temperature detection sensor 6 is provided with a lid 15. May be provided so as to penetrate, or may be provided so that the detection part faces the exhaust pipe of the exhaust part 16.

The heater 25 is configured to heat at least a part of the gas supplied into the hopper 10, and in this embodiment, the heater 25 heats the compressed gas supplied to the gas inlet 33 of the gas supply unit 30 described later. Is provided.
A compressed gas source 2 is connected to the heater 25 via a compressed gas pipe line 20a. The compressed gas source 2 may be, for example, a gas tank that stores gas (high pressure gas) compressed by a compressor such as a compressor via an aftercooler, a drain separator, or the like. Such a compressed gas source 2 may be provided with a compressed gas source 2 dedicated to the drying apparatus 1. However, in a factory or the like where a pneumatic device is installed, the compressed gas source 2 described above is a factory facility. Since it is generally provided as such, the equipment may be used.
Note that an on-off valve such as an electromagnetic valve for supplying and blocking the compressed gas to the compressed gas source 2 may be provided.

A compressed gas adjustment unit 20 that adjusts the compressed gas from the compressed gas source 2 is provided in the compressed gas pipe line 20 a having one end connected to the compressed gas source 2.
The compressed gas adjusting unit 20 includes a tempering unit 21, a dryer 22, a flow rate adjusting valve 23, and a flow meter (air flow meter) 24. In the illustrated example, the tempering unit 21, the dryer 22, the flow rate adjusting valve 23, and the flow meter (air flow meter) 24 are arranged in this order from the compressed gas source 2 toward the heater 25 side.
The tempering unit 21 includes a regulator for adjusting the pressure of compressed gas (compressor air), a filter for capturing dust and the like, a micro mist separator (oil mist filter) for capturing mist-like oil, and the like. It is good also as a thing provided.
The dryer 22 is for drying the compressor air appropriately, and may be a simple dryer such as a hollow fiber membrane dryer. You may make it the dew point of the compressor air which passed this dryer 22 become a comparatively low dew point of about -10 degreeC--40 degreeC, for example.

The flow rate adjusting valve 23 increases or decreases the flow rate of the gas sent through the compressed gas pipe 20a. For example, the flow rate adjusting valve 23 may be a flow rate adjusting valve such as a motor valve or a diaphragm valve whose opening degree can be controlled by the CPU 4a. . This flow rate adjusting valve and the CPU 4a constitute a flow rate adjusting unit.
The flow meter 24 detects the flow rate of the gas sent through the compressed gas pipe 20a, and is connected to the CPU 4a via a signal line or the like. As the flow meter 24, a known flow meter such as a differential pressure type, a hot wire type, or an ultrasonic type can be employed.
The compressed gas adjusting unit 20 including the tempering unit 21, the dryer 22, the flow rate adjusting valve 23, and the flow meter (air flow meter) 24 is installed in the control panel 4, the hopper 10, the machine base 3, and the like. Also good. Further, the compressed gas adjustment unit 20 is provided with a pressure gauge for detecting the pressure of the compressed gas in the compressed gas pipe 20a, a relief valve for maintaining the pressure, a safety valve for preventing an abnormal increase in pressure, and the like as necessary. May be. Further, the compressed gas adjustment unit 20 may not be provided with both or one of the tempering unit 21 and the dryer 22. In this case, you may make it connect the compressed gas pipe line 20a which has arrange | positioned the compressed gas adjustment unit 20 to the tempering unit provided as factory equipment, a dryer, etc. FIG.

The compressed gas supplied through the compressed gas adjustment unit 20 having the above-described configuration via the compressed gas conduit 20 a is heated in the heater 25.
In the present embodiment, the heater 25 is composed of a linear heater 28 having a gas conduit 27 as an elongated gas ventilation passage and a linear heating element inserted into the gas conduit 27 (FIG. 3A ))). Further, in the present embodiment, the gas pipeline 27 is formed in a spiral shape to form a spiral gas pipeline 27, and the heater 25 is formed as a spiral heating unit 25 including the spiral gas pipeline 27 having a built-in linear heater 28. Yes.
In this embodiment, the spiral gas pipe 27 is accommodated in the heater accommodating cylinder 17 provided on the upper surface side of the lid 15 of the hopper 10 as shown in FIG. The heater housing cylinder portion 17 is sealed at the upper end side by a top plate and sealed at the lower end side by a lid 15. In the illustrated example, the spiral gas pipeline 27 is wound so that adjacent pipelines are relatively close to or in contact with each other.
For example, the spiral gas pipe 27 may be formed by spirally bending a metal pipe such as a copper pipe having an inner diameter of about 4 mm to 30 mm and a pipe length of about 1 m to 10 m. The inner diameter and length of the spiral gas pipe 27 may be set according to the flow rate of the compressed gas supplied to the spiral heating unit 25, the volume of the hopper 10, and the like. In addition, you may make it provide the above heat insulating materials as a heat retention part of the spiral gas pipe line 27 in the outer periphery or inner peripheral side of the heater accommodating cylinder part 17. FIG.

In addition, at one end of the spiral gas pipeline 27, a receiving side connecting portion 26 (see also FIG. 3A) such as a three-way joint is provided. The receiving side connection portion 26 is fixed to the heater housing cylinder portion 17 so as to penetrate an opening provided in the top plate of the heater housing tube portion 17. In addition, a compressed gas pipe 20 a is connected to one connection port of the receiving side connection portion 26. Further, a linear heater 28 is inserted from one of the remaining connection ports of the receiving side connection portion 26 toward the other.
The linear heating element of the linear heater 28 is configured by covering a heating wire such as a nichrome wire with an insulating material, and in the spiral gas pipeline 27 in the longitudinal direction of the spiral gas pipeline 27. It is arranged along. The linear heating element of the linear heater 28 may be arranged over the entire length in the longitudinal direction of the spiral gas conduit 27 from the receiving side connecting portion 26, and from the receiving side connecting portion 26, for example, You may make it arrange | position until it reaches the site | part exceeding at least about 2/3.

Further, a supply side connection portion 29 is provided at the other end portion of the spiral gas pipe line 27. As shown in FIG. 2, the supply side connection portion 29 is fixed to the lid body 15 so as to communicate with an opening provided in the lid body 15 of the hopper 10. A gas supply unit 30 is connected to the supply side connection unit 29.
The linear heater 28 of the spiral heating unit 25 is connected to the CPU 4a via a signal line or the like. Further, the diameter of the linear heating element of the linear heater 28 may be about several mm, for example. Further, the length of the linear heating element of the linear heater 28 may be less than the length of the spiral gas pipe 27, and the target heating temperature set by the type of the granular material, the initial moisture content, etc. You may make it set according to the emitted-heat amount of the said linear heating element itself.
The helical heating unit 25 including the linear heater 28 and the helical gas pipe 27 is inserted into the copper pipe (metal pipe) and then spirally as described above. The copper tube may be bent and formed.

The gas supply unit 30 is configured to supply gas into the hopper 10 so as to circulate a part of the gas in the hopper 10, and to the gas receiving port 33 connected to the compressed gas source 2 and toward the hopper 10. And a gas supply port 38 for supplying gas. The gas supply unit 30 communicates with the gas passage 34 from the gas reception port 33 to the gas supply port 38, and is provided with a gas intake unit 37 provided so as to substantially directly take in the gas in the hopper 10. And a throttle portion 35 formed in the gas passage 34 so as to take in the gas in the hopper 10 through the gas take-in portion 37 with the introduction of the compressed gas from the gas receiving port 33.
In the present embodiment, the gas intake part 37 is disposed in the hopper 10. That is, the gas intake part 37 that takes in the gas in the hopper 10 is opened in the hopper 10 so that the gas passage 34 of the gas supply part 30 communicates with the inside of the hopper 10.

In the present embodiment, the gas supply unit 30 is a cylindrical body provided with a gas receiving port 33 at one end and a gas supply port 38 at the other end, and a gas intake unit is provided on the outer periphery thereof. The plurality of gas intake ports 37, 37, 37, 37 are provided so as to communicate with the gas passage 34. In the present embodiment, as shown in FIG. 3B, four gas intake ports 37, 37, 37, 37 are provided on the outer periphery of the gas supply unit 30 at equal intervals along the circumferential direction. .
In the present embodiment, the gas supply unit 30 is disposed so that the axial direction of the gas supply unit 30 that is a cylindrical body (the ventilation direction of the gas passage 34) is along the vertical direction. That is, the gas supply unit 30 has a structure in which a gas receiving port 33 that opens upward is provided at the upper end portion, and a gas supply port 38 that opens downward is provided at the lower end portion. Moreover, in this embodiment, the example which has arrange | positioned this gas supply part 30 in the approximate center part of the upper end part in the hopper 10 is shown. In the illustrated example, an example is shown in which the gas supply unit 30 is disposed substantially concentrically with the hopper 10 at the center of the hopper 10 in plan view.

Further, a connection part 31 connected to the supply side connection part 29 of the spiral heating unit 25 is provided at the upper end part of the gas supply part 30. As shown in FIG. 2, the connection portion 31 penetrates the lid 15 and is connected to the supply side connection portion 29 so as to be inserted into the supply side connection portion 29 of the spiral heating unit 25. That is, in the present embodiment, the gas receiving port 33 of the gas supply unit 30 is connected to the compressed gas source 2 via the helical heating unit 25 and the compressed gas pipe line 20a.
Moreover, the gas supply part 30 is made into the outer shape which has the expansion surface part 32 of the expansion shape (taper shape) toward the lower side at the lower part side of the connection part 31. As shown in FIG. In the illustrated example, the gas supply section 30 is provided with a cylindrical portion having the same diameter in the vertical direction so as to be connected to the lower side of the connection portion 31 and the expanded surface portion 32 of the upper end portion, and the lower end portion is directed downward. The outer shape is provided with a tapered portion (reduced diameter).
The plurality of gas intake ports 37, 37, 37, 37 are provided so as to open at the expanded surface portion 32, and are directed substantially toward the gas passage 34 in the axial direction in a direction substantially orthogonal to the expanded surface portion 32. The gas intake passage is formed. That is, the gas intake part has a configuration in which a plurality of gas intake passages formed so as to communicate with the gas passage 34 from the gas intake ports 37, 37, 37, 37 opened in the expanded surface portion 32 are formed. Has been. Further, these gas intake passages are provided so as to be inclined in a direction along the gas ventilation direction of the gas passage 34, not in the direction orthogonal to the gas ventilation direction of the gas passage 34.

Further, as shown in FIG. 2, the gas passage 34 is provided with a throttle portion 35 that is throttled to have a diameter smaller than the diameter of the gas receiving port 33, and continues to the downstream side (lower end portion side) of the throttle portion 35. An enlarged diameter portion 36 is provided as described above.
In this embodiment, the throttle unit 35 is provided at the upper end of the gas supply unit 30, and the gas intake ports 37, 37, 37, 37 are provided so as to communicate with the throttle unit 35. Yes. In the illustrated example, the gas intake passages from the gas intake ports 37, 37, 37, 37 are provided so as to open at the boundary portion between the throttle portion 35 and the enlarged diameter portion 36.
In the present embodiment, the enlarged diameter portion 36 is gradually expanded (tapered) toward the gas supply port 38 at the lower end.
In the example shown in the figure, the portion from the gas inlet 33 to the constricted portion 35 and the constricted portion 35 have the same diameter throughout, and a step is formed at the boundary between them. It is not restricted to such an aspect. For example, these portions may be gradually tapered (reduced diameter) toward the downstream side (lower end portion side) so that no step is formed at these boundaries. Moreover, although the example of a figure has shown the example which formed the level | step difference in the boundary of the aperture | diaphragm | squeeze part 35 and the diameter-expanded part 36, these boundary parts are expanded (tapered) so that a level | step difference may not be formed in these boundaries. Shape).

In the gas supply unit 30 having the above-described configuration, the compressed gas introduced from the gas receiving port 33 increases the flow velocity in the throttle unit 35, and the resulting pressure drop (negative pressure action) in the part causes the gas supply unit 30 to The gas on the outer periphery (that is, the gas in the hopper 10) is taken into the gas passage 34 through the gas intake ports 37, 37, 37, 37, and discharged from the gas supply port 38 through the enlarged diameter portion 36 together with the compressed gas. It is supposed to be configured. That is, with the introduction of the compressed gas from the gas receiving port 33, the gas in the hopper 10 is taken into the gas passage 34 through the gas intake ports 37, 37, 37, 37 by the so-called venturi action by the throttle portion 35, The gas is discharged from the gas supply port 38 together with the compressed gas.
In the present embodiment, as shown in FIG. 1, the drying apparatus 1 includes a gas temperature sensor 5 that detects the temperature of the gas supplied into the hopper 10. In the illustrated example, the gas temperature sensor 5 is installed on the lid 15, and the detection unit is provided so as to face the gas passage 34 of the gas supply unit 30. Further, the detection portion of the gas temperature sensor 5 is provided so as to face the downstream side of a portion communicating with the gas intake ports 37, 37, 37, 37 of the gas passage 34. In other words, the gas temperature sensor 5 is a gas in which the heated compressed gas introduced from the gas inlet 33 and the gas in the hopper 10 taken in from the gas inlets 37, 37, 37, 37 are mixed. The temperature is detected.

  On the basis of the measured temperature signal (detected temperature) of the gas temperature sensor 5, the CPU 4a causes the helical heating unit 25 so that the temperature of the gas supplied toward the hopper 10 becomes a predetermined temperature. The energization control such as ON / OFF control or PID control of the linear heater 28 is performed. The predetermined temperature is the target heating temperature set by the type of granular material, the initial moisture content, etc., the capacity of the hopper 10 and the next processing step (resin molding machine or temporary storage installed on the resin molding machine) Although it can be set according to the discharge amount etc. discharged at a time toward a hopper, other processing machines or the like (not shown), for example, it may be about 80 ° C. to 160 ° C. Note that the position where the gas temperature sensor 5 is provided is not limited to the mode shown in the figure, and for example, a mode in which a detection unit is provided on the front side of the gas supply port 38 (for example, in a gas vent pipe 14 to be described later). Good. Further, instead of detecting the temperature of the gas in which the gas in the hopper 10 taken in from the gas inlets 37, 37, 37, 37 is mixed with the compressed gas in this way, for example, the gas supply unit 30 is used. Alternatively, the temperature of the gas upstream of the gas inlet 33 may be detected. In this case, in consideration of the flow rate of the gas taken in from the gas intake ports 37, 37, 37, 37 so that the temperature of the gas discharged from the gas supply port 38 becomes the predetermined temperature as described above, The linear heater 28 of the spiral heating unit 25 may be set to a set temperature for energization control such as ON / OFF control or PID control.

The flow rate ratio (volume flow rate ratio) between the compressed gas introduced from the gas receiving port 33 and the gas discharged from the gas supply port 38 (that is, a gas obtained by adding a part of the circulating gas in the hopper 10 to the compressed gas). ) May be about 1: 1.5 to 1: 5, and preferably about 1: 2 to 1: 4. If the flow rate of the gas discharged from the gas supply port 38 with respect to the flow rate of the compressed gas is too small, the flow rate of the compressed gas necessary for drying the granular material in the hopper 10 tends to be large. On the other hand, if the flow rate of the gas discharged from the gas supply port 38 with respect to the flow rate of the compressed gas is too large, it is necessary to increase the heater capacity of the heater (spiral heating unit) 25 or the rise time (the gas supply port 38). The time required until the temperature of the gas discharged from the gas reaches a predetermined temperature tends to be prolonged.
Further, the compressed gas introduced into the gas receiving port 33 of the gas supply unit 30 is not limited to air, and may be a gas such as nitrogen or argon, or other inert gas.

The gas supply unit 30 is not limited to the one shown in the figure, and includes a gas reception port 33, a gas intake unit 37, a gas passage 34, a throttle unit 35, and a gas supply port 38. Any material can be used as long as it is configured to take in the gas in the hopper 10 through the gas intake portion 37 with the introduction of the compressed gas from the inlet 33 and discharge the gas from the gas supply port 38 together with the compressed gas. Good. For example, a nozzle that ejects compressed gas toward the gas supply port 38 may be provided in the throttle portion or the like. And it is good also as an injector-like (ejector-like) gas supply part which formed the gas intake channel | path as a gas intake part so that it could communicate with the outer peripheral side and downstream side of this nozzle.
Further, in the illustrated example, the outer shape of the gas supply unit 30 in a plan view (transverse cross-sectional view) is shown as a substantially circular shape. The outer shape in the cross-sectional view may be a substantially polygonal shape or the like.
Further, a punching metal or mesh shape is used so that powder material or relatively large powder particles are not taken into the gas passage 34 through the gas intake ports 37, 37, 37, 37 of the gas supply unit 30. A (net-like) filter may be provided in place.

  Moreover, in this embodiment, as shown in FIG.1 and FIG.3 (b), the drying apparatus 1 is provided so that it may extend up and down in the approximate center in the hopper 10, and a lower end part in the hopper 10 is provided in a lower end part. The gas vent pipe 14 having a gas discharge port 14b for discharging gas is provided. The gas vent pipe 14 is configured such that a gas supply unit 30 is connected to an upper end portion 14a of the gas vent tube 14 so as to be freely contacted and separated. In this embodiment, as shown in FIG. 2 and FIG. 3A, the gas supply unit is connected to the upper end part 14a of the gas vent pipe 14 so that the lower end part of the gas supply unit 30 is received from the upper end opening of the gas vent pipe 14. 30 is connected. Further, in the illustrated example, a sealing member 39 is fixed in a flange shape on the outer periphery of the lower end portion of the gas supply unit 30 that is a cylindrical body, and this sealing member 39 is brought into contact with the upper end opening edge of the gas vent pipe 14. The example which connected the gas supply part 30 to the upper end part 14a of the gas ventilation pipe 14 is shown.

As shown in FIGS. 1 and 3 (b), the gas vent pipe 14 has a plurality of (three in the illustrated example) flat plate shape that spans the outer circumference of the gas vent pipe 14 and the inner circumference of the hopper 10. Is held in the hopper 10 by the hanger arm 14c.
Further, the gas discharge port 14b at the lower end of the gas vent pipe 14 is disposed substantially at the center in plan view at the lower end of the hopper 10, and is configured to disperse and discharge the gas into the hopper 10. . Moreover, the lower end part of this gas ventilation pipe 14 is made into a Jinkasa shape or a cone shape, and the first-in first-out umbrella as a rectification | straightening part for discharging | emitting the stored granular material smoothly in order from the lower part side (lower layer side). Function as.
With the configuration described above, the gas supply unit 30 is desorbed from the upper end portion 14a of the gas vent pipe 14 by detaching the lid 15 from the cylindrical portion 11 of the hopper 10 or by opening the lid 15. be able to.

As shown in FIG. 1, the control panel 4 includes a clocking means such as a clock timer and an arithmetic processing unit, and a CPU 4 a as a control unit that controls each device and each unit of the drying device 1 according to a predetermined program. The CPU 4a includes an operation panel 4b and a storage unit respectively connected to the CPU 4a via signal lines and the like. The CPU 4a is connected to the above-described devices and various sensors via signal lines and the like.
The operation panel 4b constitutes a display operation unit for setting and inputting various setting operations, pre-set input items described later, and displaying various setting conditions and various operation modes.
The storage unit is composed of various memories and the like, and executes various operations such as setting conditions and input values that are set and input by operating the operation panel 4b, basic operations described later, and the above-described input operation and discharge operation. Various programs such as a control program for the control, various operating conditions set in advance, various data tables, and the like are stored.

  In the present embodiment, the CPU 4a is configured to control the heater (spiral heating unit) 25 based on the detection value (measured flow rate) of the flow meter 24 provided in the compressed gas adjustment unit 20 described above. Yes. For example, the CPU 4a monitors the measured flow rate of the flow meter 24 during the activation of the drying device 1, and if the measured flow rate of the flow meter 24 becomes zero or falls below a predetermined lower limit flow rate, the helical heating unit While the energization to the 25 linear heaters 28 is stopped, the energization to the linear heater 28 of the helical heating unit 25 is started when the measured flow rate of the flow meter 24 exceeds a predetermined upper limit flow rate. The heating unit 25 is controlled. The predetermined lower limit flow rate and the upper limit flow rate may be the same value (predetermined flow rate) or different values. Further, these predetermined lower limit flow rate and upper limit flow rate are points of view to prevent overheating of the linear heater 28 in the helical heating unit 25 due to insufficient flow rate and poor drying of the granular material due to supply of the low temperature gas to the hopper 10. For example, it may be set experimentally or empirically.

Next, an example of a basic operation executed in the drying apparatus 1 according to this embodiment having the above-described configuration will be described.
<Initial material input process>
When the drying device 1 is started up or the like, if the particulate material is not stored in the hopper 10 (empty state), the material initial charging step is executed.
For example, as described above, based on the material request signal from the material sensor provided in the hopper 10, the granular material is transported, and the collection and charging operations are executed, so that the granular material reaches the full level. Thus, the granular material is put into the hopper 10. In addition, when the above material input part is not provided, it is good also as an aspect which opens the cover body 15 and inputs a granular material, for example.
Moreover, when the granular material is stored in the hopper 10, execution of the said material initial charging process is unnecessary.

<Initial operation process>
After storing a predetermined amount of the granular material in the hopper 10 as described above, the initial operation process is executed. In this initial operation step, the temperature of the granular material stored in the hopper 10 is raised to a predetermined level, and at least the heat drying treatment of the granular material according to the discharge amount located in the lower layer is sufficiently performed. Until the predetermined temperature and moisture content (water content) are reached, and the above-described operation of feeding the particulate material into the hopper 10 and the above-described discharging operation from the hopper 10 are not performed.
In this initial operation step, the compressed gas is supplied to the spiral heating unit 25 via the compressed gas adjustment unit 20 and the compressed gas line 20a, and the linear heater 28 is activated to heat the compressed gas. The compressed gas heated in the helical heating unit 25 is supplied toward the gas supply unit 30, and together with a part of the gas in the hopper 10 taken in by the gas supply unit 30, The gas is discharged from the gas discharge port 14 b and supplied into the hopper 10. Note that when the material initial charging step is executed, the heated compressed gas is supplied, and the gas is supplied into the hopper 10 together with a part of the gas in the hopper 10 taken in by the gas supply unit 30. May be.

The gas discharged from the gas discharge port 14 b of the gas vent pipe 14 passes through the granular material layer stored in the hopper 10, and a part of the gas intake ports 37, 37, 37 of the gas supply unit 30. The excess gas is taken in through 37 and 37 and is exhausted out of the hopper 10 through the exhaust part 16.
Immediately after starting the drying apparatus 1, the granular material in the hopper 10 is at a temperature as low as room temperature (outside temperature), but the temperature gradually increases, and the gas inlet of the gas supply unit 30 The temperature of the gas taken in through 37, 37, 37, 37 also rises. The energization rate of the linear heater 28 of the helical heating unit 25 decreases as the temperature of the gas increases.
Further, by introducing the gas into the hopper 10 as described above, the temperature of the gas that has passed through the granular material layer, that is, the detection temperature of the material layer passing temperature detection sensor 6 is about room temperature (outside temperature). The temperature gradually rises from a low temperature. When the temperature of the material layer passing gas exceeds a predetermined threshold value set in advance, the opening degree of the flow rate adjusting valve 23 is changed and controlled so that the flow rate of the compressed gas supplied toward the spiral heating unit 25 is decreased. It may be. That is, the flow rate of the compressed gas introduced into the gas receiving port 33 of the gas supply unit 30 may be decreased.

As described above, in this embodiment, the temperature of the gas that has passed through the powder material layer is set as a predetermined control factor indicating the heat drying treatment state of the powder material in the hopper 10, and this temperature causes the powder particles to vary. The heat drying treatment state of the body material is estimated, and the flow rate of the compressed gas introduced into the gas receiving port 33 of the gas supply unit 30 is increased or decreased.
The predetermined threshold is experimental according to the target heating temperature set by the type of granular material, the initial moisture content, etc., the capacity of the hopper 10, the discharge amount discharged at a time for the next processing step, etc. Or what is necessary is just to set to empirically, for example, it is good also as about 40 to 120 degreeC.

Further, the opening degree control of the flow rate adjusting valve 23 is performed so that the flow rate of the compressed gas fed through the compressed gas pipe 20a is gradually decreased until the material layer passage temperature exceeds the threshold value and then falls below the threshold value. The mode may be such that the opening degree is gradually reduced. Moreover, you may make it set the minimum flow volume of the compressed gas sent through the compressed gas pipe line 20a.
As described above, if the flow rate of the compressed gas decreases, the granular material in the hopper 10 that is in the middle of heating (especially the granular material in the upper layer) loses thermal energy, and the granular material layer The temperature of the gas that has passed through gradually decreases. If the gas temperature falls below the threshold value, the flow rate of the compressed gas supplied toward the spiral heating unit 25 may be increased by changing and controlling the opening degree of the flow rate adjusting valve 23. That is, the flow rate of the compressed gas introduced into the gas receiving port 33 of the gas supply unit 30 may be increased. At this time, as in the case of decreasing, the opening degree control for gradually increasing the flow rate, that is, the mode of gradually increasing the opening degree of the flow rate adjusting valve 23 may be used. A mode in which change control is performed immediately may be adopted.

In this initial operation process, the flow rate is not changed until the threshold value is exceeded, and the gas receiving port 33 of the gas supply unit 30 is introduced with the maximum amount of compressed gas at the time of initial setting, and the gas discharge port 14b is opened. The gas with the maximum air volume is supplied into the hopper 10 through the hopper 10.
If the threshold value is exceeded, it is determined that the temperature has been raised to a predetermined state, and the flow rate of the compressed gas to be introduced is reduced. Thereby, energy saving can be achieved.
It should be noted that the time for performing this initial operation step is set experimentally or empirically according to the capacity and discharge amount of the hopper 10, the type and condition of the granular material (initial moisture content, etc.), etc. That's fine. Alternatively, a temperature sensor that detects the temperature of the lowermost layer part of the granular material layer stored in the hopper 10 is provided, and based on the measured temperature signal (detected temperature) of the temperature sensor, It is good also as an aspect which discriminate | determines whether the material has been heat-dried to the predetermined state, and alert | reports completion | finish of an initial stage operation process.
Moreover, it is good also as an aspect which starts the count by time-measurement means, such as a timer of CPU4a, when the said threshold value is exceeded, and performs the said initial operation process until predetermined time passes.

  Further, the temperature increase of the granular material performed in this initial operation step does not require the total amount of the granular material stored in the hopper 10 to be increased to a uniform temperature, and is stored in the hopper 10. What is necessary is just to make it heat up so that the temperature of the powder material of about 40 to 70% may become predetermined | prescribed temperature from the lowest part of the granular material currently used. In other words, each layer is heated by the gas introduced from the lower end of the hopper 10 so as to form a temperature gradient in the hopper 10 such that the temperature gradually increases from the upper layer portion toward the lower layer portion. Until the start of the continuous operation step described later, at any time during the continuous operation step, the initial operation step is carried out until the predetermined amount of the granular material discharged from the lowermost layer is sufficiently heated and dried. It should be executed.

<Continuous operation process>
As described above, when the initial operation process is executed and the operation preparation is completed, the process proceeds to the continuous operation process.
In this continuous operation process, the granular material that has been subjected to the heat drying process is discharged from the discharge port 13 at the lower end of the hopper 10 according to a request from the supplier, and the powder in the hopper 10 is discharged along with the discharge. The granule material is charged and replenished. For example, as described above, based on the material request signal from the supply side material sensor, the material discharge unit is opened (or activated), and the granular material stored in the hopper 10 is supplied to the supply side. You may make it do. Moreover, based on the material request signal from the material sensor provided in the hopper 10, a granular material may be conveyed, and you may make it perform a collection and injection | throwing-in operation. By this charging operation, for example, a new granular material at room temperature is charged into the hopper 10, and the temperature of the gas that has passed through the granular material layer is drastically decreased and falls below the threshold value. Thus, when the temperature of the gas that has passed through the granular material layer falls below the threshold value, the opening degree of the flow rate adjusting valve 23 is changed and controlled as described above, and the gas inlet 33 of the gas supply unit 30 is controlled. Increase the flow rate of the compressed gas to be introduced.

Hereinafter, similarly, the temperature of the gas that has passed through the granular material layer exceeds the above threshold value with the discharging operation of the granular material from the hopper 10 and the charging operation of the granular material into the hopper 10. For example, the flow rate of the compressed gas may be decreased, and the flow rate of the compressed gas may be controlled to increase if the temperature of the gas that has passed through the granular material layer falls below the threshold value.
In addition, when the drying apparatus 1 is activated and the initial operation and the continuous operation described above are performed, the spiral heating unit 25 of the spiral heating unit 25 is based on the detection value (measured flow rate) of the flow meter 24 as described above. The linear heater 28 is turned on / off.

As described above, according to the drying apparatus 1 according to the present embodiment, it is possible to improve the drying efficiency.
In other words, the gas supply unit 30 takes in the gas in the drying tank (hopper) via the gas intake unit (gas intake port) 37 with the introduction of the compressed gas from the gas receiving port 33. Since the narrowed portion 35 is provided, the gas material in the hopper 10 is circulated to dry the particulate material with a simple configuration in which the gas supply unit 30 is connected to the compressed gas source 2. be able to. In other words, in addition to the compressed gas supplied from the outside of the hopper 10, the granular material in the hopper 10 can be dried by a part of the gas in the hopper 10, so a large blower is not necessary, Further, the heater can be reduced in size, and the drying efficiency can be increased. Thereby, the exhaust amount of the gas exhausted from the hopper 10 can also be reduced efficiently, and the environment in the facility such as a factory where the drying apparatus 1 is installed can be improved.
Moreover, since the gas intake part (gas intake port) 37 of the gas supply part 10 is provided so as to take in the gas in the hopper 10 almost directly, the gas intake part (gas intake port) 37 is provided. Thus, the temperature of the gas taken in through the air becomes difficult to decrease, and the drying efficiency can be further increased.
In the present embodiment, the gas intake unit (gas intake port) 37 of the gas supply unit 30 is disposed in the hopper 10. Therefore, since the gas in the hopper 10 can be directly taken in, the temperature drop of the gas taken in through the gas intake part (gas intake port) 37 is substantially eliminated, and the drying efficiency is more effectively improved. be able to.

In the present embodiment, the heater (spiral heating unit) 25 is provided so as to heat the compressed gas supplied to the gas receiving port 33 of the gas supply unit 30. That is, the heater 25 is configured to heat the compressed gas upstream of the gas intake portion (gas intake port) 37 that takes in the gas in the hopper 10. Therefore, the gas in the hopper 10 taken in through the gas intake part (gas intake port) 37 does not pass through the heater (spiral heating unit) 25, and the heater (spiral heating unit). 25 can be effectively suppressed. That is, it is conceivable to heat the gas in the hopper 10 that has passed through a filter or the like in the hopper 10 together with the compressed gas in a heater, but in such a case, fine powder or the like that could not be removed by the filter or the like Volatile substances volatilized from the granular material adhere to and gradually accumulate on the heating element in the heater, which may cause damage to the heating element, overheating due to fouling, defective heating, etc. . According to the above configuration, such a problem can be prevented.
For example, compared with the case where a heater is provided in the downstream of the gas intake part (gas intake port) 37, the flow volume of the gas heated in the heater (helical heating unit) 25 can be made small. Therefore, the heater (spiral heating unit) 25 can be downsized.

In the present embodiment, a plurality of gas intake ports 37, 37, 37, 37 as gas intake portions are provided on the outer periphery of the gas supply portion 30 that is a cylindrical body so as to communicate with the gas passage 34. Structure. Therefore, the gas in the hopper 10 can be taken in more effectively through the plurality of gas inlets 37, 37, 37, 37.
Further, in this embodiment, the gas supply unit 30 is disposed so that the axial direction is along the vertical direction at a substantially central portion of the upper end portion in the hopper 10. Therefore, the gas that has passed through the granular material layer in the hopper 10 can be effectively taken in through the plurality of gas inlets 37, 37, 37, 37 formed on the outer periphery as described above. That is, for example, compared with the case where the gas supply unit 30 is disposed in the vicinity of the inner peripheral wall in the hopper 10 or is disposed so as to protrude from the inner peripheral wall so that the axial direction is along the horizontal direction, The gas which is diffused and discharged from the 14 gas discharge ports 14b and rises in the hopper 10 can be taken in effectively.

In the present embodiment, the heater is a spiral heating unit 25. Accordingly, the gas (compressed gas) passing through the spiral gas pipe 27 and the linear heater 28 are in efficient contact with each other, and the heat exchange between them is, for example, a sheathed heater, a plate heater, a heater with a radiating fin, or the like. This is more efficient than a heater such as a heater box with a built-in heating element, and can efficiently heat the gas. In addition, for example, the electric capacity can be made relatively small as compared with the heater such as the heater box, and power saving can be achieved.
Moreover, the responsiveness can be improved relatively, and the stability of temperature control can be improved. That is, since the heating element for heating the gas to be heated that passes through the spiral gas pipe 27 is linear, the heat capacity of the heating element itself becomes relatively small, The temperature is lowered relatively quickly. As a result, when the flow rate of the gas passing through the spiral gas pipe 27 is increased or decreased, the outlet side (gas) due to fluctuations in the outside air temperature or other disturbances (for example, the introduction of granular material) Even when the temperature of the gas at the gas supply port 38 side of the supply unit 30 fluctuates, the energization control of the linear heater 28 is performed in accordance with the increase / decrease or variation of the gas supply unit 30. The temperature of the gas on the outlet side can be made to follow a predetermined temperature relatively quickly. That is, overshoot and undershoot are less likely to occur, and the temperature of the gas supplied into the hopper 10 can be controlled to a relatively stable temperature. Therefore, it is difficult for the granular material in the hopper 10 to be overheated or to cause insufficient heating of the granular material, and an efficient drying process can be executed.

Further, in the present embodiment, the gas vent pipe 14 having the gas discharge port 14b for discharging gas at the lower end portion in the hopper 10 is provided at the approximate center in the hopper 10, so that it is stored in the hopper 10. The granular material can be dried more effectively.
Moreover, since the gas supply part 30 made into the cylindrical body is connected to the upper end part 14a of this gas ventilation pipe 14 so that contact / separation is possible, for example, those which formed these integrally or the thing which cannot be contacted / separated Compared with what was done, maintenance, cleaning, etc. of the gas vent pipe 14 and the gas supply part 30 can be performed easily.

  In the present embodiment, the flow rate sensor 24 that detects the flow rate of the compressed gas supplied to the gas inlet 33 of the gas supply unit 30, and the heater (spiral heating unit) based on the detection value of the flow rate sensor 24. And a control unit (CPU) 4 a that controls the control unit 25. Therefore, as described above, when the measured flow rate of the flow meter 24 becomes zero or falls below a predetermined lower limit flow rate, the energization of the linear heater 28 of the helical heating unit 25 is stopped, while the flow meter 24 When the measured flow rate exceeds a predetermined upper limit flow rate, control for starting energization of the linear heater 28 of the helical heating unit 25 can be executed. Thereby, damage to the helical heating unit 25, drying failure or overheating of the granular material stored in the hopper 10 can be suppressed. That is, it is possible to suppress damage due to overheating of the helical heating unit 25, poor drying due to supply of a gas lower than the set temperature to the granular material after drying or drying. Further, for example, pressure detection means such as a pressure sensor or a pressure switch for detecting the pressure of the compressed gas supplied to the gas receiving port 33 and the presence / absence of supply are provided, and the heater is controlled based on the detection of the pressure detection means. Is also possible. In this case, it is conceivable that the pressure increases due to blockage or the like on the downstream side. In such a state, if the heater is controlled based on the detection of the pressure detecting means, the gas passing through the heater It is conceivable that the flow rate will be less than specified, so the heater may be damaged due to overheating or a gas higher than the set temperature may be supplied into the drying tank. According to this, such a problem can be prevented.

  Furthermore, as in the above basic operation example, the material layer passing temperature detection sensor 6 is provided as a detecting means for detecting a predetermined control factor indicating the heat drying treatment state of the granular material in the hopper 10, The CPU 4a controls the opening degree of the flow rate adjusting valve 23 based on the detection value of the temperature sensor 6 to increase or decrease the flow rate of the compressed gas introduced into the gas inlet 33 of the gas supply unit 30, thereby further saving power. Can be achieved. In addition, by increasing or decreasing the flow rate of the compressed gas introduced in this way, it is possible to prevent deterioration (oxidation, burn, decomposition, discoloration, etc.) of the particulate material due to overheating.

In addition, increase / decrease in the flow volume of the compressed gas introduce | transduced into the gas receiving port 33 of the gas supply part 30 is not restricted to the above aspects, A various aspect can be employ | adopted.
For example, instead of the aspect of increasing or decreasing the flow rate of the compressed gas by increasing or decreasing the opening degree of the flow rate adjusting valve 23 as described above, the compressed gas pipe 20a is branched into a plurality, and at least one of the branch pipes Alternatively, an open / close valve that can be controlled by the CPU 4a may be provided, and the open / close control of the open / close valve may be performed to increase or decrease the flow rate of the compressed gas passing through the entire branch pipes. In this case, the flow rate of the compressed gas is finely increased / decreased by setting the number of these branch pipelines, the diameter of each pipeline, the valve diameter of the on-off valve, etc. according to the desired increase / decrease width or increase / decrease stage. It is also possible. Further, in this case, the branch pipe may be configured so that a compressed gas having a predetermined flow rate (for example, a relatively small flow rate) can always pass therethrough.
Alternatively, in addition to the aspect in which the plurality of branch pipes are provided, at least one of these pipes may be provided with a flow rate adjusting valve similar to the above.

Further, in the basic operation example, the temperature sensor 6 that detects the material layer passage temperature is illustrated as a detection means for detecting a predetermined control factor indicating the heat drying treatment state of the granular material in the hopper 10, Although the aspect which carries out increase / decrease control of the flow volume of compressed gas based on the detected temperature of this temperature sensor 6 was illustrated, it is not restricted to such an aspect.
For example, a material layer upper layer temperature detection sensor for detecting the temperature in the upper layer part of the granular material stored in the hopper 10 may be provided as the detection means, or stored in the hopper 10. A material layer temperature detecting sensor for detecting the temperature in the middle layer or lower layer of the powdered granular material may be provided as the detection means.
Furthermore, as described above, instead of the mode in which the predetermined control factor indicating the heat drying treatment state of the granular material material in the hopper 10 is the temperature, and a temperature sensor for detecting the temperature is provided, the control factor is As the humidity (dew point), a humidity (dew point) sensor for detecting the humidity (dew point) may be provided as the detection means. In this way, when the control factor is humidity (dew point), the detected value increases when the humidity (dew point) shifts from the higher side to the lower side, and the humidity (dew point) increases from the lower side to the higher side. What is necessary is just to grasp | ascertain that the case where it shifts to is a fall of a detected value.
Further, as in the above basic operation example, instead of a mode in which the flow rate of the compressed gas is controlled to increase or decrease, the flow rate of the compressed gas introduced into the gas inlet 33 of the gas supply unit 30 may always be a constant flow rate or the like.

Further, in the present embodiment, an example is shown in which the heater accommodating cylinder portion 17 that accommodates the spiral gas pipe 27 of the spiral heating unit 25 is provided, but such a heater accommodating cylinder portion 17 is not provided. You may do it.
Moreover, although this embodiment shows an example in which the heater is a spiral heating unit 25 having a spiral gas pipe 27, the present invention is not limited to such a mode. For example, the gas pipeline containing the linear heater may be an elongated and straight tubular gas pipeline instead of being spiral. In this case, for example, the gas pipe line may have a double pipe structure. Further, the heater applied to the drying apparatus 1 according to the present embodiment is not limited to a structure in which a linear heater is provided in such an elongated gas pipeline, and for example, a sheathed heater or a plate It is good also as heaters, such as a heater box incorporating heating elements, such as a heater and a heater with a radiation fin.

Next, other embodiment of the drying apparatus of the granular material which concerns on this invention is described, referring drawings.
FIG. 4 is a diagram schematically showing a powder material drying apparatus according to the second embodiment.
Note that differences from the first embodiment will be mainly described, and the same components will be denoted by the same reference numerals, and description thereof will be omitted or simplified.
The powder material drying apparatus 1A according to the present embodiment is mainly different from the first embodiment in the arrangement of the helical heating unit 25A.
In the present embodiment, the spiral gas pipe 27A of the spiral heating unit 25A is disposed in the hopper 10A. In the present embodiment, the spiral gas pipe 27A of the spiral heating unit 25A is spirally provided along the circumferential direction on the outer peripheral side of the gas supply unit 30A. In the illustrated example, a spiral gas pipe 27A is provided so as to be wound substantially concentrically with the axis of the gas supply unit 30A at a predetermined interval from the outer peripheral surface of the gas supply unit 30A. ing.

  Further, in the present embodiment, a heater accommodating cylinder portion 17A that accommodates the gas supply portion 30A and the helical gas conduit 27A is provided in the hopper 10A. In the illustrated example, an example in which the heater housing cylinder portion 17A is fixed to the lower surface side of the lid body 15A is shown. Further, an inner cylinder 18 that is provided substantially concentrically with the heater accommodating cylinder 17A and accommodates the gas supply unit 30A is provided in the heater accommodating cylinder 17A, and an outer periphery of the inner cylinder 18 is provided. A spiral gas pipe 27A is arranged along the surface. The heater housing cylinder portion 17A and the inner cylinder 18 form a double cylinder. The upper ends of the heater housing cylinder 17A and the inner cylinder 18 are sealed with a lid 15A, and the lower ends of the heater housing cylinder 17A and the lower edge of the inner cylinder 18 are connected to the lower edge of the heater housing cylinder 17A. Thus, the spiral gas pipe 27A is almost entirely sealed from the storage space for the granular material in the hopper 10A almost entirely. The lower end side of the inner cylinder 18 is an opening 18a. In addition, you may make it provide the above-mentioned heat insulating material as a heat retention part of 27 A of spiral gas pipe lines in the outer periphery or inner periphery of the heater accommodating cylinder part 17A similarly to the above.

The receiving-side connecting portion 26 of the helical heating unit 25A faces between the inner periphery of the heater housing cylinder portion 17A and the outer periphery of the inner tube 18 so that the one connecting portion penetrates the lid body 15A. Thus, it is fixed to the lid 15A.
Further, the supply destination side connection portion 29 of the spiral heating unit 25 </ b> A is introduced into the inner tube 18 from an opening provided in the inner tube 18 and is connected to a gas supply unit 30 </ b> A accommodated in the inner tube 18.
The gas supply unit 30A has a substantially similar configuration, although its outer shape is slightly different from that of the first embodiment. In the present embodiment, the lower part of the expanded surface part 32 (see FIG. 2 and the like) at the upper end part has a tapered outer shape toward the lower side. Further, generally in the same manner as in the first embodiment, the gas supply unit 30A is disposed so that the axial direction is along the up-down direction at a substantially central portion of the upper end portion in the hopper 10A. In the illustrated example, an example is shown in which the gas supply unit 30A is provided at a position slightly deviated outward from the center of the hopper 10A in plan view.

  Further, in the gas supply unit 30A, a connection portion 31 (see FIG. 2 and the like) at the upper end portion is fixed to a fixing plate 8 at the lower end portion of the bracket 7 provided so as to be suspended from the lid body 15A. In addition, the porous plate 9 is fixed to the fixed plate 8 so as to surround the outer periphery of the gas supply unit 30A. With such a configuration, the gas in the hopper 10 </ b> A flows through the opening 18 a at the lower end of the inner cylinder 18 and a large number of through holes formed in the porous cylinder 9, so that the gas intake part (gas Air can be supplied toward the intake port 37. In addition, as an aspect which accommodates and hold | maintains gas supply part 30A in the inner cylinder 18, it is not restricted to an above-described aspect. For example, without providing the bracket 7, the fixing plate 8, the porous cylinder 9, or the like, or without providing the bracket 7, the porous cylinder 9 or the gas supply unit 30 </ b> A and the inner cylinder 18 are connected to a connecting member such as a hanger arm. It is good also as an aspect which accommodates and hold | maintains by connecting by.

A connecting cylinder 19 is fixed to the lower end of the porous cylinder 9 so as to be detachably connected to the upper end 14a of the gas vent pipe 14A. The connecting cylinder 19 is provided so as to extend downward from the opening 18a at the lower end of the inner cylinder 18, and is connected to the upper end 14a of the gas vent pipe 14A so as to receive the upper end 14a of the gas vent pipe 14A. . In the illustrated example, the lower end opening of the connection cylinder 19 is shown in an expanded shape so that the upper end portion 14a of the gas vent pipe 14A can be smoothly received.
Also in the drying apparatus 1A according to the present embodiment configured as described above, the lid body 15A is detached from the cylindrical portion 11 of the hopper 10A or the lid body 15A is opened, as in the first embodiment. Thus, the connection tube 19 can be detached from the upper end portion 14a of the gas vent pipe 14A together with the gas supply unit 30A.

In the present embodiment, the detection unit of the gas temperature sensor 5A is provided so as to face the connection cylinder 19 on the downstream side of the gas supply port 38 of the gas supply unit 30A.
In the present embodiment, the upper end portion 14a of the gas vent pipe 14A is slightly bent according to the arrangement position of the gas supply unit 30A (the connecting cylinder 19) that is in the eccentric position as described above. .
In addition, as an aspect which provides the connection cylinder 19 connected detachably to the upper end part 14a of the gas ventilation pipe 14A, it replaces with the above-mentioned example which fixed the connection cylinder 19 to the lower end part of the porous cylinder 9, and gas It is good also as an aspect which connects the fixing plate 8 and the connection cylinder 19 by connection members, such as a several wire, so that the connection cylinder 19 may be hold | maintained so that distribution | circulation of this is possible. Or it is good also as an aspect which fixes the lower end part of the gas supply part 30A, and the connection cylinder 19, and connects the gas supply part 30A or the connection cylinder 19, and the inner cylinder 18 with connection members, such as a hanger arm.

Also in the drying apparatus 1 </ b> A according to the present embodiment configured as described above, various operations similar to those of the drying apparatus 1 described in the first embodiment are performed, and substantially the same effects are achieved.
Further, in the present embodiment, the spiral gas pipe 27A of the spiral heating unit 25A is provided along the circumferential direction on the outer peripheral side of the gas supply unit 30A that is a cylindrical body. Insulation or heating can be performed from the outer peripheral side, and the drying efficiency can be improved more effectively. Moreover, the gas which goes to the gas intake part (gas intake port) 37 which takes in the gas in the hopper 10A is made into the spiral gas pipe line 27A on the outer peripheral side of the gas supply part 30A (in the illustrated example, via the inner cylinder 18). And indirectly) can also be heated.
Further, in the present embodiment, the heater housing cylinder portion 17A and the inner cylinder having a double cylinder structure that is substantially hermetically cut off from the storage space for the granular material in the hopper 10A while being housed in the hopper 10A. 18, the spiral gas pipe 27 </ b> A is accommodated almost entirely. Accordingly, the spiral gas pipeline 27A is substantially hermetically cut off from the storage space for the granular material in the hopper 10A over the entire area, and the adhesion of fine powder and the like to the spiral gas pipeline 27A is suppressed. it can.

In addition, you may make it apply the porous cylinder 9 and the connection cylinder 19 which were demonstrated in this embodiment to the drying apparatus 1 which concerns on the said 1st Embodiment. In this case, the sealing member 39 described above may not be provided.
Further, as described in the first embodiment, the detection part of the gas temperature sensor 5A is located downstream of the part communicating with the gas intake ports 37, 37, 37, 37 of the gas passage 34 of the gas supply part 30A. You may make it provide so that it may face.
Moreover, in this embodiment, although the example which provided the heater accommodating cylinder part 17A and the inner cylinder 18 is shown, you may make it not provide both or one of these.

Next, still another embodiment of the powder material drying apparatus according to the present invention will be described with reference to the drawings.
FIG. 5 is a diagram schematically showing a drying apparatus for granular material according to the third embodiment.
Note that differences from the above-described embodiments are mainly described, and the same components are denoted by the same reference numerals, and description thereof is omitted or briefly described.
The powder material drying apparatus 1B according to the present embodiment is mainly different from the above embodiments in the arrangement of the gas supply unit 30A.
In the present embodiment, the hopper 10B is provided with a cylindrical accommodating portion 18A that opens toward the inside of the hopper 10B, and the gas intake portion (gas intake port) 37 of the gas supply portion 30A is provided in this cylinder. It arrange | positions in the shape accommodating part 18A. In addition, the gas supply unit 30A is arranged so that the axial direction is along the up-and-down direction substantially on the upper side of the central portion in the plan view of the hopper 10B. In the illustrated example, an example is shown in which the gas supply unit 30A is provided at a position slightly deviated outward from the center of the hopper 10B in plan view.

In the present embodiment, the cylindrical housing portion 18A is provided substantially concentrically with the gas supply portion 30A, and is fixedly provided on the lid body 15B. An opening corresponding to the opening 18a at the lower end of the cylindrical housing portion 18A is formed in the lid 15B. That is, the cylindrical accommodating portion 18A is fixedly provided at the upper end portion of the hopper 10B, and the opening 18a at the lower end thereof is configured to open downward. Such a gas in the cylindrical housing portion 18A also has a temperature substantially the same as that of the gas in the hopper 10B, and the cylindrical housing portion 18A may be regarded approximately as a space in the hopper 10B.
The upper end side of this cylindrical accommodating portion 18A is sealed by a top plate, and a porous porous cylindrical body formed on its lower surface so as to surround the outer periphery of the gas supply portion 30A similar to the second embodiment. A fixed plate 8 to which 9 is fixed is provided. A connecting cylinder 19A, which is substantially the same as that of the second embodiment and is connected to the upper end 14a of the gas vent pipe 14B, is fixed to the lower end of the porous cylinder 9. In the present embodiment, an example is shown in which the upper end portion 14a of the gas ventilation pipe 14B is received from the opening 18a at the lower end of the cylindrical housing portion 18A so as to extend upward. Further, the connection cylinder 19A is detachably connected to the upper end portion 14a of the gas vent pipe 14B so as to receive the upper end portion 14a of the gas vent pipe 14B.
Also in the drying apparatus 1B according to the present embodiment configured as described above, the lid body 15B is detached from the cylindrical portion 11 of the hopper 10B or the lid body 15B is opened, as in the second embodiment. Thus, the connecting tube 19A can be detached from the upper end portion 14a of the gas vent pipe 14B together with the gas supply unit 30A. Note that at least the upper end portion 14a of the gas vent pipe 14B may be flexible tube-shaped.

In this embodiment, as in the second embodiment, the spiral gas pipe 27B of the spiral heating unit 25B is spirally provided along the circumferential direction on the outer peripheral side of the gas supply unit 30A. . That is, the spiral gas pipe 27B is disposed along the outer peripheral surface of the cylindrical housing portion 18A.
Further, similarly to the second embodiment, a heater housing cylinder portion 17B having a double cylinder shape is provided by the cylindrical housing portion 18A. In the present embodiment, the heater accommodating cylinder portion 17B is provided on the upper surface side of the lid body 15B of the hopper 10B, as in the first embodiment, and between the heater accommodating cylinder portion 17B and the cylindrical accommodating portion 18A. In this structure, the entire spiral gas pipe 27B is accommodated.
Also in the drying apparatus 1B according to the present embodiment configured as described above, the spiral gas pipe 27B extends from the storage space for the granular material in the hopper 10B over the entire portion, as in the second embodiment. It is cut off substantially hermetically, and adhesion of fine powder or the like to the spiral gas pipe 27B can be suppressed. In addition, you may make it provide the above-mentioned heat insulating material as a heat retention part of the spiral gas pipe line 27B similarly to the above in the outer periphery or inner periphery of the heater accommodating cylinder part 17B.

  Further, in the present embodiment, the gas temperature sensor 5B is installed on the top plate of the heater housing cylinder part 17B, and the detection part is placed in the connection cylinder 19A on the downstream side of the gas supply port 38 of the gas supply part 30A. It is provided to face. In general, as in the first embodiment, the detection unit of the gas temperature sensor 5B faces the downstream side of the part communicating with the gas intake ports 37, 37, 37, 37 of the gas passage 34 of the gas supply unit 30A. You may make it provide.

Also in the drying apparatus 1B according to the present embodiment configured as described above, various operations similar to those performed in the drying apparatus 1 described in the first embodiment are performed, and substantially the same effects as in the second embodiment are achieved. .
Moreover, in this embodiment, since the gas intake part (gas intake port) 37 of the gas supply part 30A is arrange | positioned in the cylindrical accommodating part 18A, the gas in the hopper 10B is taken in substantially directly. Can do.
Further, the gas intake part (gas intake port) 37 (in the illustrated example, almost the entire gas supply part 30A) of the gas supply part 30A is disposed in the cylindrical housing part 18A that opens toward the hopper 10B. Therefore, compared with the case where it arrange | positions in the hopper 10B, the storage capacity of the granular material of the hopper 10B can be enlarged.

Next, still another embodiment of the powder material drying apparatus according to the present invention will be described with reference to the drawings.
FIG. 6 is a diagram schematically showing a powder material drying apparatus according to the fourth embodiment.
Note that differences from the above-described embodiments are mainly described, and the same components are denoted by the same reference numerals, and description thereof is omitted or briefly described.
The drying apparatus 1C for the granular material according to the present embodiment is different from the third embodiment in that the heater housing cylinder portion for housing the spiral gas pipe 27C of the spiral heating unit 25C is not provided. Different.

Further, in the present embodiment, the gas temperature sensor 5C is installed on the outer periphery of the cylindrical housing portion 18A, and the detection portion faces the connection cylinder 19A on the downstream side of the gas supply port 38 of the gas supply portion 30A. Provided. In general, as in the first embodiment, the detection part of the gas temperature sensor 5C faces the downstream side of the part communicating with the gas intake ports 37, 37, 37, 37 of the gas passage 34 of the gas supply part 30A. You may make it provide.
Also in the drying apparatus 1 </ b> C according to the present embodiment configured as described above, various operations similar to those performed in the drying apparatus 1 described in the first embodiment are performed, and substantially the same effects as the third embodiment are achieved. .
Moreover, in this embodiment, since the heater accommodation cylinder part is not provided, it will be somewhat inferior in terms of safety and heat insulation (heat dissipation prevention), etc., as compared with the third embodiment. Can be simplified.

Next, still another embodiment of the powder material drying apparatus according to the present invention will be described with reference to the drawings.
FIG. 7 is a diagram schematically showing a powder material drying apparatus according to the fifth embodiment.
Note that differences from the above-described embodiments are mainly described, and the same components are denoted by the same reference numerals, and description thereof is omitted or briefly described.
In the powder material drying apparatus 1D according to the present embodiment, a spiral gas pipe 27D of the spiral heating unit 25D is provided along the circumferential direction on the outer peripheral side of the gas supply unit 30A that is a cylindrical body. This is mainly different from the fourth embodiment.
In the present embodiment, the spiral gas pipe 27D of the spiral heating unit 25D is provided on the upper side of the cylindrical housing portion 18B that houses substantially the entire gas supply portion 30A.

Further, in the present embodiment, the gas supply unit 30A is disposed so that the axial direction is along the vertical direction on the upper side of the central portion in the plan view of the hopper 10C. Further, a cylindrical housing portion 18B is provided substantially concentrically with the gas supply portion 30A, that is, above the central portion in the plan view of the hopper 10C, and the upper end portion 14a of the gas vent pipe 14C is substantially straight without bending. It is tubular.
Further, in the present embodiment, an opening that communicates the inside and outside of the tubular housing portion 18B is provided on the outer periphery of the tubular housing portion 18B, and the exhaust portion 16A is provided in the tubular housing portion 18B so as to communicate with the opening.
Also in the drying apparatus 1 </ b> C according to the present embodiment configured as described above, various operations similar to those of the drying apparatus 1 described in the first embodiment are performed.
Further, since the spiral gas pipe 27D of the spiral heating unit 25D is not provided on the outer peripheral side of the gas supply unit 30A, the heat retaining property of the gas supply unit 30A and the gas intake unit (gas Although the temperature rise property of the gas toward the intake port 37 is somewhat inferior to that of the fourth embodiment, the same effect as that of the fourth embodiment can be obtained. Note that, for example, a heater housing cylinder portion that houses the spiral gas pipe 27D of the spiral heating unit 25D may be provided on the upper side of the tubular housing portion 18B.

In each of the above embodiments, the heaters (spiral heating units) 25, 25A, 25B, 25C, 25D are provided so as to heat the compressed gas supplied to the gas inlets 33 of the gas supply units 30, 30A. However, the present invention is not limited to such a mode. For example, you may make it provide a heater in the downstream of the gas intake part (gas intake port) 37 and the gas supply port 38 of the gas supply parts 30 and 30A. In this case, for example, a linear heater or the like as a heater may be provided in the gas ventilation pipes 14, 14A, 14B, and 14C. In this case, a gas temperature sensor may be provided on the downstream side of the heater so that the detection unit faces.
Further, in each of the above embodiments, a plurality of gas intake ports 37, 37, 37, 37 as gas intake portions are communicated with the gas passage 34 on the outer periphery of the gas supply portions 30, 30 </ b> A that are cylindrical bodies. Although an example of the structure provided as described above is shown, a structure in which a single gas intake port 37 is provided may be used.

Moreover, in each said embodiment, although the gas supply part 30,30A made into the cylindrical body was connected to the upper end part 14a of gas vent pipe 14,14A, 14B, 14C so that contact / separation was possible, it showed, These may be formed integrally or connected so that they cannot be separated from each other.
Moreover, although each said embodiment showed the example which provided the gas supply parts 30 and 30A made into the cylindrical body in the upper end part 14a of the gas ventilation pipes 14, 14A, 14B, and 14C, the gas ventilation pipe 14 is shown. , 14A, 14B, and 14C may be provided with gas supply units 30 and 30A in the upper and lower middle portions, lower end portions, and the like. In this case, the spiral gas pipelines 27, 27A, 27B, 27C, and 27D may be appropriately modified. Furthermore, the gas supply parts 30 and 30A themselves are elongated vertically, and the gas intake part (gas intake port) 37 is arranged in the upper end part in the hoppers 10 and 10A and the cylindrical storage parts 18A and 18B. And it is good also as an aspect which has arrange | positioned the gas supply port 38 as a gas discharge port in the lower end part in the hopper 10, 10A, 10B, 10C. That is, you may make it function the gas supply parts 30 and 30A also as a gas vent pipe.

  Further, in each of the above-described embodiments, the gas supply units 30 and 30A are arranged so that the axial direction is along the vertical direction at the upper end portion in the hoppers 10 and 10A or the generally central portion on the upper side of the hoppers 10B and 10C. However, the present invention is not limited to such an embodiment. For example, the gas supply units 30 and 30A may be arranged in the vicinity of the inner peripheral wall in the hopper 10, 10A, or may be arranged so as to protrude from the inner peripheral wall so that the axial direction is along the horizontal direction. Further, the cylindrical accommodating portions 18A and 18B are provided so as to be attached to the outer peripheral walls of the hoppers 10B and 10C, and the gas supply portion 30A is provided in the cylindrical accommodating portions 18A and 18B so that the axial direction is along the horizontal direction. May be arranged. In these cases, the gas vent pipes 14, 14A, 14B, 14C and the like may be appropriately modified, and the gas supply units 30, 30A themselves may be appropriately modified.

Further, in each of the above-described embodiments, the gas intake as a gas intake portion opened in the hoppers 10 and 10A or in the cylindrical accommodating portions 18A and 18B is provided on the outer periphery of the gas supply portions 30 and 30A having a cylindrical body. Although the example which provided the opening | mouth 37 is shown, it is not restricted to such an aspect. The gas intake section of the gas supply section 30, 30A may be provided so as to substantially directly capture the gas in the hopper 10, 10A, 10B, 10C. For example, the gas passage of the gas supply section 30, 30A It is good also as a structure which provided the tubular gas intake part in the outer periphery of the gas supply parts 30 and 30A so that it may connect to 34. FIG.
In each of the above embodiments, the hoppers 10, 10A, 10B, and 10C in which the upper part has a cylindrical shape and the lower part has an inverted conical shape are illustrated as the drying tank for storing the granular material. Any material can be used as long as it can store the material. For example, a drying tank having a box shape may be used.
In addition, the different configurations described in the above embodiments may be applied as appropriate by appropriately rearranging or combining them as long as these functions are not impaired. In this case, the configuration of each part or the like may be modified as necessary.

1,1A, 1B, 1C, 1D Drying device for granular material 10, 10A, 10B, 10C Hopper (drying tank)
14, 14A, 14B, 14C Gas vent pipe 14a Upper end part 14b Gas discharge port 16, 16A Exhaust part 18A, 18B Cylindrical housing part 24 Flow meter 25, 25A, 25B, 25C, 25D Spiral heating unit (heater)
27, 27A, 27B, 27C, 27D Spiral gas pipe (gas vent)
28 Linear heater 30, 30A Gas supply part 33 Gas inlet 34 Gas passage 35 Restriction part 37 Gas inlet (gas inlet)
38 Gas supply port 4a CPU (control unit)
2 Compressed gas source

Claims (8)

A drying tank for storing the granular material, a heater for heating at least a part of the gas supplied into the drying tank, and a part of the gas in the drying tank are circulated in the drying tank. A gas supply unit for supplying gas, and an exhaust unit for exhausting excess gas in the drying tank,
The gas supply unit communicates with a gas reception port connected to a compressed gas source, a gas supply port for supplying gas toward the drying tank, and a gas passage from the gas reception port to the gas supply port, And the gas intake part provided so that the gas in the said drying tank may be taken in substantially directly, and the introduction in the said drying tank through the said gas intake part with introduction of the compressed gas from the said gas receiving port And a throttling part formed in the gas passage so as to take in the gas. In claim 1,
The said heater is provided so that the compressed gas supplied to the gas receiving port of the said gas supply part may be heated, The drying apparatus of the granular material material characterized by the above-mentioned. In claim 1 or 2,
A drying apparatus for a granular material, wherein a gas intake part of the gas supply part is arranged in the drying tank. In claim 1 or 2,
The drying tank is provided with a cylindrical housing portion that opens toward the drying tank, and the gas intake portion of the gas supply unit is disposed in the cylindrical housing portion. Drying device for powder material. In any one of Claims 1 thru | or 4,
The gas supply unit is a cylindrical body provided with the gas receiving port at one end and the gas supply port at the other end, and a plurality of gas intakes as the gas intake unit are provided on the outer periphery thereof. An apparatus for drying a granular material, wherein the inlet is configured to communicate with the gas passage. In claim 5,
The heater is an elongated tube including an elongated gas ventilation path and a linear heater disposed along the longitudinal direction in the gas ventilation path, and on the outer peripheral side of the gas supply unit, A drying apparatus for a granular material, wherein the drying apparatus is provided spirally along a circumferential direction. In claim 5 or 6,
The lower end of the drying tank is provided with a gas discharge port for discharging gas at the lower end of the drying tank, while the upper end of the gas supply section is freely contactable and separable. A drying apparatus for a granular material, further comprising a gas ventilation pipe to be connected. In any one of Claims 1 thru | or 7,
The apparatus further comprises a flow meter that detects a flow rate of the compressed gas supplied to the gas receiving port of the gas supply unit, and a control unit that controls the heater based on a detection value of the flow meter. Drying device for granular materials.

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