HK1087769A - Drying-storing apparatus for powder material and feeding system for powder material - Google Patents

Description

Drying and storing device for powdered or granular material and supply system for powdered or granular material

Technical Field

The present invention relates to an apparatus for drying and storing resin pellets, grains such as rice, wheat, adzuki beans, and soybean, and other powder and granular materials, and to an improvement in a supply system to a processing apparatus for powder and granular materials using the drying and storing apparatus.

Background

For example, in a manufacturing system of a resin molded article, a powder/granular material (thermoplastic resin pellets) is generally supplied from a powder/granular material tank to a dryer, and the dried powder/granular material is transported to an inlet (material port) of the molding machine by air. Further, a supply system is adopted in which thermoplastic resin pellets as a raw material are sucked and conveyed from a stock ground, collected by a collector, and thrown into a heating dryer serving also as a normal hopper directly attached to a material inlet of a molding machine. Patent document 1 discloses a vacuum type automatic continuous dehumidifying and drying apparatus for a powder and granular material used in the above supply system, which is a registered utility model of the applicant. The apparatus can be successively introduced into a molding machine while dehumidifying and drying resin pellets, and contributes greatly to the efficiency of a system for producing resin molded articles.

In the supply system, the raw material supply nozzle is inserted into the resin pellets accumulated in the stock ground, and the resin pellets are sucked and conveyed to the dehumidification drying apparatus, so that the dehumidification drying apparatus which also serves as a normal hopper only has a capacity enough to be temporarily stored in accordance with the processing capacity of the molding machine, and the capacity of the heating means or the like is appropriately set so that the dehumidification drying is sufficiently performed during the retention period.

However, resin pellets as a raw material are often loaded in kraft paper bags, for example, in 25kg units and carried in, and the efficiency of production may be improved by directly feeding the resin pellets into a supply device. However, in the case of a small molding machine having a molding capacity of about 1000g/hr, since it is sufficient to have a drying capacity of about 4kg, the dehumidifying and drying apparatus which also serves as the normal hopper does not have a capacity capable of accommodating 25kg of resin pellets at a time, and in order to cope with this, it is conceivable to increase the capacity, but the capacity of the heating unit or the like must be increased. In view of the throughput (1000g/hr) of such a resin molding machine, it is not necessary to heat all 25kg of resin pellets at all times, which causes waste due to heating, increases the equipment cost, and increases the running cost.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a novel dry storage device for a powdered or granular material and a supply system for a powdered or granular material, which can achieve an efficiency of the entire manufacturing and processing system using a powdered or granular material as a raw material, in consideration of the processing capacity of a processing device such as a molding machine, the heating and drying efficiency, and the like.

In order to solve the above problems, the invention of claim 1 provides a dry storage device for powdered or granular material, comprising: the device comprises a heating and drying chamber and a hopper chamber, wherein the heating and drying chamber is provided with a discharge port at the lower end and a heat conduction heating unit is arranged in the heating and drying chamber, and the hopper chamber is connected to the upper end of the heating and drying chamber; the heating and drying chamber and the hopper chamber form a series of storage tanks for the particulate material.

According to this configuration, a large amount of particulate material such as 25kg of resin pellets contained in a kraft paper bag or the like can be charged into a particulate material storage tank formed by vertically connecting a heating and drying chamber and a hopper chamber at a time, the particulate material storage tank being a predetermined transport unit. The lower heating and drying chamber is capable of sequentially supplying the dried powder and granular material to a processing device such as a forming machine from a discharge port at the lower end while heating and drying the powder and granular material in an amount corresponding to the processing capacity of the processing device. In addition, the storage tank for the powdered or granular material is configured to be airtight, and the inside thereof can be depressurized by a depressurizing means (claim 2), and in such a case, the moisture evaporated by the heat-conducting heating means is gradually discharged to the outside, and the storage tank is always maintained in a dry atmosphere.

Further, as the heat conduction heating means, it is preferable that the heat conduction heating means is constituted by a heat source and heat conduction means for transferring heat from the heat source to the powder or granular material (claim 3), and more preferably, the heat conduction heating means is constituted by an outer cylinder member and/or an inner cylinder member, the outer cylinder member is constituted by a cylinder wall, a 1 st heater as the heat source provided in the cylinder wall, and a plurality of fins as the heat conduction means provided from an inner surface of the cylinder wall toward a center portion thereof and spaced in a circumferential direction, and the inner cylinder member is constituted by a columnar body suspended from the center portion of the outer cylinder member, a 2 nd heater as the heat source embedded in the columnar body, and a plurality of fins as the heat conduction means provided in the columnar body in a radial direction (claim 4). The cylindrical wall and the fins constituting the outer cylinder member and the cylindrical body and the fins constituting the inner cylinder member of the heat conductive heating unit are preferably formed of a metal having good heat conductivity (for example, aluminum) (claim 5). As the 1 st and 2 nd heaters, in addition to the electric heating type heaters, microwave type heaters may be used.

By adopting such a heat conduction heating method, heat from the built-in or embedded heater is uniformly transmitted to the particulate material such as resin pellets retained in the heating and drying chamber through the inner surface of the cylindrical wall and the plurality of fins, and the particulate material is efficiently dried. Further, since local overheating of the powder/granular material does not occur, there is no problem that the powder/granular material is partially melted in the heating/drying chamber.

The cylindrical body has a lower end formed with a rectifying portion (claim 6) having a downwardly-enlarged diameter (conical or half hat shape), and by providing such a rectifying portion, when the particulate material is discharged from the discharge portion, the particulate material is kept in first-out, and thus the particulate material that has not been dried is not discharged first.

An open/close lid is provided at the upper end of the hopper chamber, and the powder/granular material can be charged into the storage tank by opening the open/close lid (claim 7), or an upper surface of the open/close lid may be opened, and a charging hopper may be provided at the opening through a discharge valve (claim 8). They may be appropriately selected corresponding to the user's needs. Further, it is preferable that a carrier gas introducing means for introducing a carrier gas is further provided in the storage tank (claim 9). By providing such a carrier gas introduction means, the function of the pressure reducing means is combined with the function of promoting the rapid discharge of the volatile substances such as water vapor generated in the storage tank by heating.

The invention of claim 10 provides a supply system of a powdered or granular material using the dry storage device according to any one of claims 1 to 9; the method is characterized in that: the powder and granular material dried in the drying and storing device is conveyed by the air conveying unit while being discharged from the discharge port, and is once collected by a catcher connected to the end of the air conveying unit and then supplied to a processing device for the powder and granular material.

Further, a circulation line communicating with the inside of the drying and storing device is connected to the feeding device, and the powdered or granular material discharged from the drying and storing device is air-conveyed in the circulation line and can be circulated to the drying and storing device (claim 11). The present supply system is preferably used when the processing apparatus for the powdered or granular material is a resin molding machine and the powdered or granular material is resin pellets (claim 12).

Brief description of the drawings

Fig. 1 is a schematic overall configuration diagram showing an example of a supply system of a powder and granular material according to the present invention.

Fig. 2 is an external side view of a dry storage device for powdered or granular material used in the system.

FIG. 3(a) is a cross-sectional view taken along line X-X of FIG. 2, and (b) is a longitudinal-sectional view taken along line Y-Y of (a).

FIG. 4(a) is a partial sectional front view of the feeder device, and (b) is a sectional view taken along line Z-Z of (a).

Fig. 5 is a view similar to fig. 1 in another embodiment.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a schematic overall configuration diagram showing an example of a supply system of a powdered or granular material according to the present invention, fig. 2 is an external side view of a dry storage device of a powdered or granular material used in the system, fig. 3(a) is a cross-sectional view taken along line X-X of fig. 2, and fig. 3(b) is a longitudinal cross-sectional view taken along line Y-Y of fig. 3 (a). In the figure, a denotes a drying and storing device for a granular material, and the drying and storing device a is composed of a hopper chamber 1 and a heating and drying chamber 2 connected to the lower end thereof. The hopper chamber 1 has a larger capacity than the heating and drying chamber 2, and is vertically connected to each other by an adjustable fixture and a jig such as a bolt and a nut through a packing (not shown), thereby forming a series of airtight powder and granular material storage tanks 10 inside the hopper chamber. A cylindrical discharge port 10a is provided at the lower end of the powder/granular material storage tank 10.

The upper end of the hopper chamber 1 is widely opened, and the opening/closing lid 11 is hermetically covered and fixed by an adjustable fixing tool 11a through a packing (not shown). The supply of the particulate material to the particulate material storage tank 10 is performed by releasing the adjustable holder 11a, lifting the opening/closing cover 11 by the handle 11b to open the opening, and pouring 25kg units of resin pellets filled in the kraft paper bag as described above at a time from the opening.

The heating and drying chamber 2 comprises a heat conduction heating unit which is composed of an outer cylinder component 3 and an inner cylinder component 4; the outer cylinder assembly 3 is provided with first heaters 32a and 32b as heat sources in a cylinder wall 31 having a conical lower half, and a plurality of fins 33 as heat transfer means provided at intervals in the circumferential direction from the inner surface of the cylinder wall 31 toward the center; the inner cylinder assembly 4 is provided with a plurality of fins 43 as heat transfer means radially on a columnar body 41, and the columnar body 41 is suspended from the central portion of the outer cylinder assembly 3, and a 2 nd heater 42 as a heat source is embedded therein. The inner cylinder unit 4 is supported at the center thereof by a spoke-like cantilever 45 extending from a flange-like support ring 44 toward the heart side, and the support ring 44 is disposed at the upper end of the outer cylinder unit 3 so as to be concentrically suspended in the outer cylinder unit 3. A rectifying portion 46 having a downward diameter-expanding shape (a conical shape or a straw hat shape) is formed at the lower end of the columnar body 41.

The 1 st heaters 32a and 32b are silicone rubber heaters, and a heat insulating layer 34 is disposed on the outer side thereof and is added to the cylindrical wall 31. The 2 nd heater 42 is embedded in the columnar body 41 of the inner cylinder assembly 4. The 2 nd heater 42 is led out to the outside through the cantilever 45, and is connected to a power source together with the 1 st heater 32. The cylindrical wall 31 and the fins 33 of the outer cylinder unit 3, and the columnar bodies 41 and the fins 43 of the inner cylinder unit 4 are made of metal having good thermal conductivity, such as aluminum, and constitute a heat transfer means. Further, the upper ends of the respective fins 33 of the outer cylinder assembly 3 are cut to be downwardly inclined toward the center, and the upper ends of the fins 43 of the inner cylinder assembly 4 are cut to be downwardly inclined outward, so that the powder and granular material is prevented from being retained at the upper end portions thereof.

In the heating and drying chamber 2 configured as described above, the powder or granular material charged into the hopper chamber 1 enters each space surrounded by the cylindrical wall 31 and the fins 33 of the outer cylinder assembly 3, and the columnar bodies 41 and the fins 43 of the inner cylinder assembly 4, which are small in size, and is deposited and accumulated. During this time, when the 1 st and 2 nd heaters 32(a, b), 42 are powered on, the heat transfer means transfers heat to the particulate material retained in the small space, thereby heating the particulate material. This heat transfer is performed with extremely high efficiency, and the powder/granular material is heated to a temperature suitable for the processing step (molding step) described later while evaporating the water adhering to the surface of the powder/granular material.

The powder/granular material subjected to the heating and drying is discharged from the discharge port 10a by a predetermined amount, and fed to a forming machine as a processing device through a feeding device described later. Then, the granular material is dropped by the discharged amount from the hopper chamber 1 into the heat drying chamber 2 by its own weight, and the heat drying is repeated. Since the rectifying portion 46 as described above is formed at the lower end of the columnar body 41, the powder/granular material is first in and first out when the powder/granular material is discharged and dropped by its own weight, and the powder/granular material that has not been heated and dried is not discharged first. The heat conduction heating means is not limited to the illustrated configuration, and may be configured only by the outer cylinder unit 4, or may be configured by disposing columnar heat conduction heating means having a heat source and heat conduction means in the plurality of heating/drying chambers 2.

The drying and storing apparatus a of the present embodiment includes a pressure reducing means 5 capable of reducing the pressure in the storage tank 10 of the powder and granular material to a vacuum state. In fig. 1, reference numeral 51 denotes a vacuum pump, and is connected to the powder and granular material storage tank 10 through a pipe 52. A filter 53 is provided in the middle of the pipe 52 to remove dust generated in the powder and granular material storage tank 10. Reference numeral 54 denotes a pressure gauge which monitors clogging of the filter 53 and the like. A bypass pipe 54 is branched from the piping 52, and the bypass pipe 54 passes through a cyclone 55 to a release valve 56.

That is, by operating the vacuum pump 51, the inside of the storage tank 10 for powdered or granular material is evacuated and depressurized, and the water vapor generated by the action of the heat conductive heating means of the heating and drying chamber 2 is gradually discharged to the outside of the apparatus. When the inside of the storage tank 10 needs to be returned to the atmospheric pressure in order to discharge the powder or granular material in the storage tank 10 from the discharge port 10a, the vacuum pump 51 is stopped and the release valve 56 is opened, so that the outside air is introduced into the storage tank 10 through the release valve 56. In this case, dry air may be introduced into the storage tank 10 through a purge line described later to make the storage tank 10 at atmospheric pressure, thereby preventing introduction of moist outside air.

The drying and storing apparatus a configured as described above can be preferably used by being directly attached to an injection or extrusion resin molding machine 9 as a processing apparatus for a powdered or granular material to be described later and by directly charging resin pellets in the storage tank 10 to the charging port of the molding machine 9, but fig. 1 shows an example of a supply system suitable for a resin pellet using an air transportation means. A feeder 6 is attached to a lower end discharge port 10a of the storage tank 10 for the particulate material, and an air transfer unit 7 is connected thereto to feed the resin pellets in the storage tank 10 to the molding machine 9.

Fig. 4(a) is a partial sectional front view of the feeding device 6, and fig. 4(b) is a sectional view taken along line Z-Z of fig. 4 (a). In the air feed unit 7, as shown in fig. 1, a main compressed air line 70 is connected to a compressor, not shown, by pipes, and a feed line 71, a flow line 72, a circulation line 73, and a purge line 74 are branched from the main compressed air line 70. Solenoid valves 71a, 72a, 73a, and 74a are provided on the way of the feed line 71, the flow line 72, the circulation line 73, and the purge line 74.

The delivery pipe 71 is connected to a delivery pipe connector 61 attached to the feeder 6, and compressed air introduced through the connector 61 is discharged from a nozzle 62 extending into the tubular body 60 of the feeder 6. The tubular body 60 is connected to the lower end discharge port 10a of the reserve tank 10, and an air supply pipe 75 is connected to the tubular body 60 on the side opposite to the nozzle 62. A flow line connector 63 facing the feed side in the air delivery pipe 75 is attached to the air delivery pipe 75 connection side of the feeder 6, and the flow line 72 is connected to the flow line connector 63. The waste discharge valve 60a is provided at the lower end of the tubular body 60 and is closed at all times.

A catcher 76 positioned at the inlet of the molding machine 9 is connected to the end of the air duct 75, and a discharge valve 75a for opening and closing the duct is provided in the middle of the air duct 75. Reference numeral 75b denotes an air pipe for operating the discharge valve 75 a. Reference numeral 76a denotes a level meter for detecting the amount of resin particles accumulated in the catcher 76. The level gauge 76a is of a capacitance type, a light transmission type, or the like. In addition, reference numeral 76b denotes a filter device for removing dust from the transport air and discharging clean air to the outside of the system. Preferably, as illustrated, a heating unit 76c is provided between the catcher 76 and the inlet of the molding machine 9, and the resin pellets are heated again to a temperature suitable for molding, corresponding to the kind of resin, or when the temperature of the resin pellets is lowered during the transfer, or the like.

Hereinafter, a method of supplying and charging the dried resin pellets from the drying and storing device a to the molding machine 9 by using the supply system of the air transporting unit 7 configured as described above will be described. Resin pellets were charged into the storage tank 10 of the drying and storage apparatus a in advance in a unit of 25 kg. Further, the discharge valve 75a, the electromagnetic valves 71a, 72a, 73a, 74a, and the excess material discharge valve 60a are closed, the storage tank 10 for the powder/granular material is in an airtight state, the depressurizing means 5 is operated, and the 1 st and 2 nd heaters 32, 42 of the heating and drying chamber 2 are powered on, thereby continuing the heating and drying of the resin pellets in the heating and drying chamber 2 and the depressurizing and vacuum state in the storage tank 10. In this state, the water vapor evaporated from the surface of the resin particles is gradually discharged from the decompression unit 5.

In the molding machine 9, resin particles are dropped from the catcher 76, and are gradually molded into an appropriate shape, and the deposition amount of the resin particles in the catcher 76 is monitored by the level gauge 76 a. When the level gauge 76a is detected to be at or below the predetermined height, the decompression unit 5 is stopped, and the release valve 56 is opened, so that the pressure in the powder/granular material storage tank 10 becomes atmospheric pressure. Then, when the discharge valve 75a is opened and the electromagnetic valve 71a of the transfer line 71 is opened, the resin pellets heated and dried in the heating and drying chamber 2 fall from the discharge port 10a into the cylindrical body 60 of the feeder 6 by their own weight, and are sucked into the air transfer line 75 by a local negative pressure phenomenon accompanied by the action of the air ejected from the nozzle 62. Then, the resin particles are continuously fed into the air feed pipe 75 by the pressure feeding action of the jet air from the nozzle 62, and are trapped by the trap 76.

The above feeding is sequentially continued, and when it is detected that the level gauge 76a reaches a predetermined height, the electromagnetic valve 71a of the conveying pipe 71 is closed, and the forced feeding of the resin pellets by the jet air from the nozzle 62 is stopped. In this state, since the resin particles are accumulated in the air transport pipe 75, the electromagnetic valve 72a of the flow line 72 is immediately opened, and the compressed air is introduced and injected from the flow line connector 63 to the inlet of the air transport pipe 75, and the resin particles in the air transport pipe 75 are pressure-fed and fed toward the catcher 76.

When the feeding of the resin particles in the air delivery pipe 75 is finished, the discharge valve 75a and the electromagnetic valve 72a of the flow line 72 are closed. Then, the relief valve 56 is closed, and the depressurizing unit 5 is operated, so that the inside of the storage tank 3 is again depressurized and vacuumed, and the heat drying of the resin pellets retained in the heat drying chamber 2 after the resin pellets have fallen down again from the hopper chamber 2 by their own weight as discharged from the discharge port 10a is continued.

During the above-described heat drying, a carrier gas is introduced into the storage tank 10 in order to facilitate discharge of the evaporated water vapor as necessary. That is, the purge line 74 is connected to the vicinity of the discharge port 10a, and when the solenoid valve 74a is opened, compressed air from the compressor is introduced into the reserve tank 10 from the discharge port 10 a. At this time, if the air flow rate is switched through the hollow fiber membrane filter 70a disposed in the main compressed air line 70, only the nitrogen gas in the compressed air is separated and supplied, and the nitrogen gas becomes a carrier gas, and passes through the resin particle deposition layer in the storage tank 10, thereby further promoting the discharge of the evaporated water vapor and the like. The amount of compressed air supplied to the purge line 74 is, of course, reduced to such an extent that the pressure in the storage tank 10 is maintained at a reduced level.

In addition, in the processing step of the resin molded article, it is necessary to circulate the resin pellets. For example, in the case of some materials, if the material is left standing in a dried state by heating for a certain time or more, arching may occur. In order to prevent the occurrence of the overlap, when the material stays for a certain time or more, the material is circulated in order to forcibly move the material. In fig. 4(b), the circulation line 73 is introduced into the lower part of the tubular body 60 of the charging device 6, and compressed air is injected from the nozzle 64 communicating with the circulation line 73. Further, a circulation line 77 is connected to the opposite side of the nozzle 64, and the end of the circulation line 77 is introduced into the upper part of the storage tank.

When the resin pellets are circulated to the storage tank 10 by the circulation system, the decompression means 5 is stopped, the release valve 56 is opened, and the storage tank 10 is brought to atmospheric pressure. Subsequently, the solenoid valve 73a of the circulation line 73 is opened to inject the compressed air from the nozzle 64. By the jetting action of the compressed air, the resin pellets falling down into the tubular main body 60 by their own weight are fed under pressure in the circulation line 77 and fed and circulated into the storage tank 10 in the same manner as in the case of using the nozzle 62. At this time, since the compressed air is introduced into the reserve tank 10, the pressure in the reserve tank 10 becomes positive, and the surplus air is gradually discharged from the release valve 56 to the outside of the apparatus. The exhaust air also contains dust, but is dedusted by the cyclone 55, and clean air is discharged from the release valve 56.

The drying and storing device a is mounted on a carriage 8 with casters 81 together with its related equipment. Therefore, the apparatus itself is extremely compact, and the operator appropriately moves the apparatus to a target position of the manufacturing line, connects the main compressed air line 70 to a compressed air supply port from a compressor, and connects the catcher 76 of the molding machine 9 to an air delivery pipe 75, thereby supplying the resin pellets. Reference numeral 82 denotes a control board for performing the above-described operations.

Fig. 5 shows another embodiment, in which a part of the upper surface of the opening/closing cover 11 of embodiment 1 is opened, and a loading hopper (normal hopper) 13 is provided in the opening via a discharge valve 12. In this embodiment, the resin pellets are charged into the charging hopper 13, the discharge valve 12 is opened by manual operation, and the resin pellets charged into the charging hopper 13 can be charged into the hopper chamber 2 by gravity drop. Therefore, since the adjustable retainer 11a is not operated as in embodiment 1, and the opening/closing lid 11 having a heavy weight does not need to be lifted, it is possible to easily insert the adjustable retainer. The opening/closing lid 11 is also advantageous for internal maintenance when resin pellets are charged from the charging hopper 13, but the discharge valve 12 and the charging hopper 13 may be provided in a hopper chamber without the opening/closing lid 11. Since other configurations are the same as those of embodiment 1, the same reference numerals are used for the same portions, and the description thereof is omitted.

When the opening/closing lid 11 is opened or the resin pellets are charged into the charging hopper 13, the decompression unit 5 is stopped and the release valve 56 is opened to set the pressure in the powder/granular material storage tank 10 to the atmospheric pressure. In the above embodiment, the example of air conveyance by compressed air has been described, but air conveyance by suction is not excluded. Although the storage drying and supply system of the resin pellets are described, the present invention can be suitably applied to the storage drying and supply system of grains such as rice, wheat, adzuki bean, soybean, and other powder grains.

Effects of the invention

As described above, according to the drying and storing apparatus for powdered or granular material of the invention according to claim 1 of the present invention, a relatively large amount of powdered or granular material such as 25kg of resin pellets can be fed at a time into the powdered or granular material storage tank formed by vertically connecting the heating and drying chamber and the hopper chamber. In the lower heating and drying chamber, the powdered or granular material dried can be sequentially fed from the discharge port at the lower end to the processing apparatus while heating and drying the powdered or granular material in an amount corresponding to the processing capacity of the processing apparatus such as the molding machine. Therefore, the efficiency of the operation can be improved, and the waste of energy in the heating and drying chamber does not occur.

Further, as in the invention of claim 2, when the storage tank for the powdered or granular material is configured to be airtight and the pressure inside the storage tank can be reduced by the pressure reducing means, the moisture evaporated by the heat conductive heating means is gradually discharged to the outside, and the storage tank is always maintained in a dry atmosphere. Further, by configuring the heat conductive heating means as in the inventions of claims 3 to 5, the heat from the built-in or embedded heater is uniformly transmitted to the powder or granular material such as resin pellets retained in the heating and drying chamber through the inner surface of the cylindrical wall and the plurality of fins, and the powder or granular material is dried with good efficiency. Further, since the powder or granular material is not locally overheated, there is no fear that the powder or granular material is partially melted in the heating and drying chamber.

When the rectifying portion as in the invention of claim 6 is provided in the heating and drying chamber, the powdered or granular material is discharged from the discharge portion, and the powdered or granular material that has not been dried is not discharged first while maintaining the first in/first out. Therefore, the heating and drying of the powder and granular material can be continued in an amount corresponding to the capacity of the processing apparatus such as the molding machine, and an excessively large heating means is not required, which is advantageous for further energy saving.

When the opening/closing lid is provided at the upper end of the hopper chamber according to the invention of claim 7 or the hopper is further provided through the discharge valve at the opening portion by opening the upper surface of the opening/closing lid according to the invention of claim 8, a large amount of powder or granular material, for example, 25kg, can be fed at a time by manual operation to perform the operation with good efficiency. Further, by providing the carrier gas introduction means according to the invention of claim 9, the function of the pressure reducing means is also performed to promote rapid discharge of water vapor generated in the storage tank by heating.

In the supply system of powdered or granular material according to the invention of claims 10 to 12, the powdered or granular material such as resin pellets is efficiently heated and dried, and the supply is systematic in accordance with the handling capability of the processing apparatus such as the molding machine, so that it is extremely rational and very advantageous for the production process of the resin molded article and the like.

Field of industrial application

In the field of manufacturing resin molded articles using resin pellets, energy saving and efficiency of manufacturing processes can be achieved.

Claims (12)

1. A dry storage device for a granular material, characterized in that: the device comprises a heating and drying chamber and a hopper chamber, wherein the heating and drying chamber is provided with a discharge port at the lower end and a heat conduction heating unit is arranged in the heating and drying chamber, and the hopper chamber is connected to the upper end of the heating and drying chamber; the heating and drying chamber and the hopper chamber form a series of storage tanks for the particulate material.

2. The dry storage device for powdered or granular material according to claim 1, wherein: the storage tank for the granular material is configured to be airtight, and the inside of the storage tank can be depressurized by a depressurizing unit.

3. The dry storage device for powdered or granular material according to claim 1 or 2, characterized in that: the heat conduction heating means is composed of a heat source and a heat conduction means for transferring heat from the heat source to the particulate material.

4. The dry storage device for powdered or granular material according to claim 3, wherein: the heat conducting and heating unit is composed of an outer cylinder component and/or an inner cylinder component, wherein the outer cylinder component is composed of a cylinder wall, a 1 st heater serving as a heat source and arranged in the cylinder wall, and a plurality of fins serving as heat conducting units, wherein the fins are arranged from the inner surface of the cylinder wall to the center part and are spaced in the circumferential direction, and the inner cylinder component is composed of a columnar body suspended at the center part of the outer cylinder component, a 2 nd heater serving as a heat source and embedded in the columnar body, and a plurality of fins serving as heat conducting units and arranged in the columnar body in a radial mode.

5. The dry storage device for powdered or granular material according to claim 4, wherein: the cylinder wall and the fins of the outer cylinder assembly and the cylinder body and the fins of the inner cylinder assembly are made of metal with good heat conductivity.

6. The dry storage device for powdered or granular material according to claim 4 or 5, characterized in that: a rectifying portion having a diameter expanded downward is formed at the lower end of the columnar body.

7. The dry storage device for powdered or granular material according to any one of claims 1 to 6, characterized in that: an opening/closing lid is provided at an upper end of the hopper chamber, and the powder/granular material can be charged into the storage tank by opening the opening/closing lid.

8. The dry storage device for powdered or granular material according to claim 7, wherein: the upper surface of the opening/closing lid is opened, and a feed hopper is provided to the opening through a discharge valve.

9. The dry storage device for powdered or granular material according to any one of claims 1 to 8, characterized in that: a carrier gas introduction means for introducing a carrier gas is provided in the storage tank.

10. A supply system for a particulate material, characterized in that: a feeding device is provided at a lower end discharge port of the drying and storing device according to any one of claims 1 to 9, and the feeding device is connected to an air transporting unit, and the powder or granule material dried in the drying and storing device is transported by the air transporting unit while being discharged from the discharge port, and is once collected by a catcher connected to an end of the air transporting unit and then supplied to a processing device for the powder or granule material.

11. The supply system of particulate material according to claim 10, wherein: the feeding device is connected to a circulation line communicating with the inside of the drying and storing device, and the powder and granular material discharged from the drying and storing device is air-conveyed in the circulation line and circulated to the drying and storing device.

12. The supply system of the particulate material according to claim 9 or 10, characterized in that: the powder material is a resin pellet, and the processing device of the powder material is a resin molding machine.