CN102762346A - Depressurization type drying device for powder and granular material - Google Patents
Depressurization type drying device for powder and granular material Download PDFInfo
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- CN102762346A CN102762346A CN2011800099810A CN201180009981A CN102762346A CN 102762346 A CN102762346 A CN 102762346A CN 2011800099810 A CN2011800099810 A CN 2011800099810A CN 201180009981 A CN201180009981 A CN 201180009981A CN 102762346 A CN102762346 A CN 102762346A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/042—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying articles or discrete batches of material in a continuous or semi-continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
- F26B9/063—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers for drying granular material in bulk, e.g. grain bins or silos with false floor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Drying Of Solid Materials (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Disclosed is a depressurization type drying device (1) for powder and granular material comprising a hopper (20) for storing powder and granular material, and a depressurization means (3) for depressurizing the inside of the hopper, wherein the device is provided with hopper outer periphery heat retaining units (40, 26) arranged on the outer periphery of the hopper, a heated gas supply unit (4) for supplying heated gas to the hopper, and a control unit (80) for controlling the heated gas supply unit to supply gas which has been heated to a preset temperature.
Description
Technical field
The present invention relates to a kind of decompression type drying device of powder and granular material, it possesses the hopper (hopper) and the mechanism of decompressor to reducing pressure in this hopper of storing powder and granular material.
Background technology
Decompression type drying device as in the past powder and granular material; Adopted following mode: under the airtight state of the hopper that will store powder and granular material; Through the mechanism of decompressor with reducing pressure in this hopper; And the heat conduction fin on the internal perisporium through being arranged on hopper thick and fast etc. is with the powder and granular material heating (for example with reference to following patent documentation 1 and patent documentation 2) that is stored in the hopper.
In the decompression type drying device of such powder and granular material; For heat conduction fin is heated equably; Need to adopt the bigger heater of power consumption, in addition, for the powder and granular material that will be stored in the hopper heats equably; Heat conduction fin need be set thick and fast, so the problem that exists the cost of device to uprise.In addition, because heat conduction fin is set thick and fast, there is the problem of cleaning property variation.
On the other hand, in following patent documentation 3, proposed the Minton dryer of following structure: only the outer peripheral face at vacuum tank is provided with heating arrangements, in the inboard of this vacuum tank, separates impartial interval from the inner peripheral surface of this vacuum tank and comes configuration space spare.In such device, explaining has: the material that is stored on one side in the vacuum tank is dried between the inner peripheral surface through vacuum tank and the distance piece on one side, so even the heating arrangements of the outer peripheral face only through being located at vacuum tank heats, also drying equably.
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2000-127153 communique
Patent documentation 2: TOHKEMY 2000-127154 communique
Patent documentation 3: No. 4084692 communique of japanese
Summary of the invention
Invent problem to be solved
But; In the Minton dryer that above-mentioned patent documentation 3 is put down in writing; For example when the lower powder and granular materials such as pellets of synthetic resins of pyroconductivity being carried out the heat drying processing; This powder and granular material becomes heat-insulating material, can expect on the direction of crosscut vacuum tank, producing the temperature difference (thermograde) of powder and granular material.In order to prevent the generation of such temperature difference; Promptly for the amount of discharging to subsequent processing at least of powder and granular material (all amounts or with from the corresponding ormal weight of the request of subsequent processing) is heated to set point of temperature equably; Need make the interval between the inner peripheral surface of outer peripheral face and vacuum tank of distance piece more approaching, but the problem that exists the storage capacity of hopper to diminish.
In addition; Only heat, so especially when the startup of device, owing to the intensification of the housing self of vacuum tank consumes heat energy through conducting from the heat of periphery; So exist start-up time elongated, and then the amount of above-mentioned discharge be heated to the also elongated problem of time of set point of temperature equably.
The present invention makes in view of above-mentioned actual conditions, and its purpose is, is easy structure though provide a kind of, also can improve the decompression type drying device of powder and granular material of the heat drying efficient of powder and granular material.
Be used to solve the scheme of problem
For reaching said purpose, the decompression type drying device of powder and granular material of the present invention possesses: hopper, store powder and granular material; And the mechanism of decompressor, to reducing pressure in this hopper; The decompression type drying device of this powder and granular material is characterised in that to possess: hopper periphery insulation portion is arranged on the periphery of said hopper; The heated air supply unit is supplied with the gas of heating in said hopper; And control part, said heated air supply unit is controlled, make its supply be heated to be the gas of predefined set point of temperature.
In the present invention who has adopted said structure, supply with the gas that is heated to be set point of temperature, thus, even decompression type if powder and granular material just can come directly heating through heated air, can heat powder and granular material effectively.Promptly; Through heated air powder and granular material is heated; And through this heat treated and the reduced pressure treatment of being undertaken by the mechanism of decompressor; The moisture and the volatile substance (being designated hereinafter simply as moisture etc.) that are evaporated in the hopper from the powder and granular material emersion are replaced with above-mentioned heated air, and promptly be discharged to outside the hopper, can carry out the heat drying of powder and granular material effectively and handle through the attraction of the mechanism of decompressor.
Such heated air also can and be supplied with extraneous air (atmosphere) heating, but through supplying with compressed air behind lower modified of dew point etc., can carry out the dried of the powder and granular material in the hopper more efficiently.
In addition; With in the past be that master's heat treated is compared with the such heat conduction of decompression type drying device; Start-up time in the time of can greatly shortening the device startup, in addition, can shorten the time that the amount of discharging to subsequent processing at least of powder and granular material is heated to equably set point of temperature.
And then, as decompression type drying device in the past, need in hopper, not dispose the heat conduction fin that is used to heat powder and granular material thick and fast, perhaps heat conduction fin can be set.Therefore, the cleaning property in the hopper can be greatly improved, but and the storage capacity of the powder and granular material in the hopper can be enlarged effectively.
And then, in addition,, can prevent heat release from hopper through hopper periphery insulation portion, so can the heat energy to the heated air supplied with in the hopper be used for effectively the heat treated of powder and granular material, can carry out rapidly heat drying and handle.
At this; Above-mentioned powder and granular material is meant the material of powder, plastochondria shape; But also comprise the material of micro thin sheet, short fiber sheet or strip of sheet etc.; As this material, can enumerate the material that resin particle such as synthetic resin material or resin fibre sheet etc. or metal material and semi-conducting material, wood materials, drug material, food material etc. need heat drying to handle.
In addition; Decompression state in the hopper that reaches through the above-mentioned mechanism of decompressor is meant the vacuum state that becomes the pressure state that forces down than atmosphere in this hopper; But in the startup of this device, when being powder and granular material dry; In order often to become decompression state, also can adjust the quantity delivered of heated air and the traffic attraction of the mechanism of decompressor (capacity).Perhaps, be also included within the startup of this device, temporarily become the above working method of atmospheric pressure in the hopper.
In the present invention, said heated air supply unit is possessed: the gas reservoir, store gas from compressed air source; Open and close valve is arranged at the pipeline that this gas reservoir and said hopper are communicated with; And gas introduction port, make the gas that has passed through this pipeline be directed into the bottom in the said hopper; Make said open and close valve open through said control part, gas moment of said gas reservoir is imported in the said hopper, make in this hopper and boost rapidly.
Through adopting such structure, the moment through gas imports boosting rapidly in the hopper that causes, the powder and granular material layer that is stored in the hopper is applied impact, can make the change of powder and granular material layer.Therefore, can prevent adhere to condense (bridge joint) with powder and granular material of powder and granular material to the hopper inwall.Promptly; Powder and granular material in this device behind the heat drying is supplied with the request of target etc. according to resin molding machine etc., and discharge and carry towards supplying with target, if but such discharge and conveying do not compare the long time; Then the powder and granular material layer in the hopper does not produce mobile, change; Along with the carrying out that heat drying is handled, different according to the kind of powder and granular material, there is powder and granular material to be attached to each other and is condensed into the trend of piece.According to the present invention who has adopted said structure; Do not have like this under the situation that moves, changes of powder and granular material layer; Promptly discharge and carry under the situation that does not compare the long time; Boost rapidly through gas moment importing is made in the hopper, can destroy the coagulated state of the powder and granular material in the hopper, or prevent to condense in advance.
The action of the powder and granular material layer that the gas that as above-mentioned, is imported by moment causes; Owing in hopper, stored powder and granular material thick and fast,, such action promptly can not occur stirring so the action that this range upon range of state destroys can not occur with range upon range of state; Because the importing of the gas of moment and layer integral body are lifted and float a little in this wise; Each powder and granular material moves a little, changes thus, can destroy coagulated state, or prevent to condense in advance.
In addition; The capacity of gas reservoir is the degree of boosting in the hopper that causes of the importing of pressure, the gas of the import volume of the gas that imports moment, the internal diameter that makes the pipeline that gas reservoir and hopper be communicated with, gas that moment imports; According to the storage capacity that is stored in the powder and granular material in the hopper and kind, through the vacuum in the hopper of mechanism of decompressor decompression etc., the powder and granular material layer in the hopper is set at the degree that can as above-mentioned, change gets final product.
In addition; Through above-mentioned control part the open timing of above-mentioned open and close valve can be set at: the discharging operation of for example keeping watch on the material discharge portions such as discharge baffle plate that are located at the hopper bottom; After having carried out discharge; During before discharge,, make it open whenever surpassing predefined official hour next time.Perhaps, also can pressure detecting mechanism be set, when the detected value of this pressure detecting mechanism surpasses the force value of predefined regulation, make it open at the upstream side (gas reservoir side) of open and close valve.
In addition, in the present invention, also can be that said hopper periphery insulation portion possesses: heating arrangements be arranged on the periphery of said hopper; And insulation, be arranged on the periphery of this heating arrangements.
If adopt such structure, then can more effectively prevent the heat release of hopper, and the heating arrangements through this hopper periphery insulation portion, the intensification of the powder and granular material in can auxiliaring bucket.That is, in hopper,, can directly and carry out heat drying to powder and granular material effectively and handle, and pass through heat transfer, can heat indirectly from the periphery of hopper through the supply of depressurization and heated air.
In addition, in the present invention, also can be, said heated air supply unit possesses: the gas ventilation road forms helical form; And the wire heater, in this gas ventilation road, dispose along this gas ventilation road.
If adopt such structure, can be effectively with the gas heating that is supplied in the hopper.Promptly; Contact effectively with the wire heater through the gas in the spiral helicine gas ventilation road; These heat exchanges and for example sheath heater or plate heater, the heaters such as heating cabinet that are built-in with the heaters such as heater of band heat release fin are compared; Can more effectively carry out, can this gas be heated effectively.
Like this, can improve the efficiency of heating surface,, can make the electric capacity small heaters, can realize economize on electricityization so for example compare with heaters such as above-mentioned heating cabinets, and can be with this heater self miniaturization.Therefore, can this heater be arranged on and the approaching position of hopper or periphery of hopper etc., can reduce heat loss etc.
In addition, as above-mentioned, adopt the structure that will heat through the gas in the spiral helicine gas ventilation road, thereby can improve response relatively through the wire heater.That is, be used for through the heating target in the above-mentioned gas vent passage, be that the heater of gas heating is a wire, so the thermal capacity of heater self is less, the intensification of heater self or cooling are rapider.The result; Even taken place under the situation of increase and decrease at flow through the gas in the spiral helicine gas ventilation road; Or because change, other interference of extraneous air temperature cause the temperature of the gas of outlet side (hopper side) to produce under the situation of change; Also be accompanied by this increase and decrease and change, the temperature of gas of the outlet side of this heater that causes to the energising of this wire heater control is more promptly chased after from the temperature of regulation.That is, difficult overregulating or less stress joint etc. can be controlled to be more stable temperature with the temperature of the gas that is supplied to the heating in the hopper.
In addition, in the present invention, also can be, in the periphery of said hopper along circumferentially said gas ventilation road being set with helical form.
If adopt such structure, can the wire heater along this gas ventilation road configuration be also used as the heating arrangements of hopper periphery insulation portion.In addition, the heating arrangements that is supplied to the gas heating in the hopper is in the position extremely approaching with hopper, can more effectively reduces heat loss.
In addition; In the present invention; Also can be, make of the internal perisporium upper shed that form mortar shape of the end on said gas ventilation road, on this internal perisporium, porous plate is set with mode along this internal perisporium in the hopper bottom; This porous plate covers this opening, and makes the gas dispersion of discharging from this opening.
If adopt such structure, the gas that can make heating disperses and the gas of heating is imported in the hopper from the opening of the end on gas ventilation road.
In addition, in the present invention, also can be, said heated air supply unit possesses: the gas ventilation pipe, and the substantial middle in said hopper is along being provided with up and down; And gas discharge outlet, be arranged at the bottom of this gas ventilation pipe.
If adopt such structure, can be supplied in the hopper along the heated gas in the bottom gas ventilation pipe and in hopper that is provided with up and down passing through in hopper.
In addition, can be through the heated air of discharging with the heating of the powder and granular material in the hopper from gas discharge outlet, and can heat through the heat transfer from the periphery of this gas ventilation pipe.Thus, can more effectively carry out heat drying to the powder and granular material in the hopper handles.Especially; Under the situation that is provided with the hopper periphery insulation portion that possesses heating arrangements; Direct heating through the heated air of discharging from the bottom of above-mentioned gas breather pipe and from the indirect heating of the heat transfer of the periphery of gas ventilation pipe and hopper periphery can more effectively be carried out heat drying to the powder and granular material in the hopper and handle.
In addition, in the present invention, also can be, on above-mentioned heated air supply unit, the flow adjustment part is set, the flow of this flow adjustment part adjustment gas supplied in hopper.In this case, also can be, testing agency is set; This testing agency is used to detect the controlling element of regulation; The controlling element of this regulation is represented the heat drying treatment state of the powder and granular material in the hopper, based on the detected value of this testing agency, controls above-mentioned flow adjustment part through above-mentioned control part; Make the flow increase and decrease of the heated air of supply, the flow of handling with the heat drying that becomes the powder and granular material that is suitable for being undertaken by this device.Also can be; For example, Yi Bian drive the above-mentioned mechanism of decompressor with reducing pressure in the above-mentioned hopper, Yi Bian to controlling above-mentioned flow adjustment part; So that when the detected value of above-mentioned testing agency surpasses the threshold value of predefined regulation; The flow of heated air is reduced, when this detected value is lower than above-mentioned threshold value, the flow of heated air is increased.
Also can be, replace the mode that above-mentioned that kind makes the flow increase and decrease, perhaps except above-mentioned that kind makes the mode of flow increase and decrease; Control the heated air supply unit through above-mentioned control part, when the startup of device, all amounts that drop into the powder and granular material in the hopper are about the temperature of extraneous air; So in order promptly to heat up; Do not start the mechanism of decompressor, perhaps under the state that starts the mechanism of decompressor, heated air is supplied in the hopper.At this moment, can be more than the atmospheric pressure in the hopper, perhaps also can be decompression state.In addition, at this moment, also can the heated air of big air quantity be supplied in the hopper.
On the other hand; Also can be, control the heated air supply unit through above-mentioned control part, the heat treated of the powder and granular material in hopper (have for example been carried out after the specified degree; When the detected value of above-mentioned testing agency surpasses the threshold value of predefined regulation; When having passed through the stipulated time after perhaps, when perhaps having passed through predefined duration of runs at initial stage), under reduced pressure heated air is supplied in the hopper.At this moment, also can the heated air of less air quantity be supplied in the hopper.
As above-mentioned controlling element, can enumerate along with the powder and granular material in the hopper carries out heat drying and handle and the various physical quantitys of change, for example can enumerate time, temperature, humidity (dew point), pressure (vacuum) etc.And as the testing agency of detecting these controlling elements, the mechanism that employing can detect the change of these physical quantitys gets final product.
The invention effect
The decompression type drying device of powder and granular material of the present invention though be easy structure, also can improve the heat drying efficient of powder and granular material through adopting the structure of above-mentioned that kind.
Description of drawings
Fig. 1 is the summary construction diagram of an embodiment that schematically shows the decompression type drying device of powder and granular material of the present invention.
Fig. 2 (a) be with Fig. 1 in the X-X alignment look corresponding broken section approximate vertical view, (b) be the broken section summary decomposition side view that schematically shows the hopper bottom of this decompression type drying device.
Fig. 3 is the summary construction diagram of other embodiments that schematically shows the decompression type drying device of powder and granular material of the present invention.
Fig. 4 (a) and (b) all are the key diagrams of the heated air supply unit that is used to explain that this decompression type drying device is possessed; (a) being the summary construction diagram that schematically shows this heated air supply unit, (b) is the general principal view that schematically shows the heat exchanger of this heated air supply unit.
Fig. 5 (a)～(c) is the summary construction diagram of a variation that schematically shows the heated air supply unit of the decompression type drying device that is applied to powder and granular material of the present invention respectively, (d) is that the broken section summary of a variation that schematically shows the gas introduction port of the decompression type drying device that is applied to powder and granular material of the present invention amplifies longitudinal section.
Fig. 6 (a) and (b) all are respectively the summary construction diagrams of another other embodiments that schematically shows the decompression type drying device of powder and granular material of the present invention.
Fig. 7 (a) and (b) all are respectively the summary construction diagrams of another other embodiments that schematically shows the decompression type drying device of powder and granular material of the present invention.
The specific embodiment
Following with reference to description of drawings embodiment of the present invention.
Fig. 1 and Fig. 2 are the key diagrams of decompression type drying device that is used to explain the powder and granular material of first embodiment.
In addition, in Fig. 1, Fig. 3～Fig. 7, schematically show the part of the pipeline (gas piping, powder and granular material transfer pipeline etc.) that makes gas and powder and granular material circulation with solid line.
In addition, in Fig. 2 (b), the diagram of the insulation of stating after the omission 26.
The decompression type drying device 1 of the powder and granular material of legend is as shown in Figure 1, possesses: hopper portion 2 possesses the hopper main body 20 as the storagetank of storing powder and granular material; The mechanism of decompressor 3 is with decompression in this hopper main body 20; Heated air supply unit 4 is to supplying with the gas of heating in the hopper main body 20; And control panel 8.
Input side (upper side) in hopper portion 2 is provided with material throw-in part 6, is provided with material discharge portion 7 in the discharge side (lower side) of hopper portion 2.
In addition, in legend, this decompression type drying device 1 is assembled into frame-like, is arranged in the bottom to have on the chassis 10 of scroll wheel.
The hopper main body 20 of hopper portion 2 is processed by metal materials such as stainless steel or aluminium etc., and top forms drum, and the bottom forms the inverted cone shape, is connected with material discharge pipe 20a in the bottom of this hopper main body 20.
At the lower side position of the interior side space of hopper main body 20, be provided with that the powder and granular material that is used to make storage is discharged from lower side (lower layer side) successively swimmingly, as the FIFO umbrella 20b of the cone shape of rectification part.
In addition; The internal perisporium that forms the bottom of inverted cone shape forms the mortar shape; On this bottom internal perisporium, be provided with internal perisporium opening 21, this internal perisporium opening 21 is used for process heated air supply unit 4 and heated gas imports in the hopper main body 20 (also with reference to Fig. 2 (a)).This internal perisporium opening 21 is arranged near the lower end of bottom internal perisporium, promptly material discharge pipe 20a near.
In addition, on this bottom internal perisporium, shown in Fig. 2 (a), to cover internal perisporium opening 21 and the mode of internal perisporium is provided with porous plate 22 along the bottom.On this porous plate 22, offer a plurality of passage 22a, these passages 22a can circulate gas, and is made as and can stops the aperture of passing through that is stored in the powder and granular material in the hopper main body 20.
In hopper main body 20, discharge and the heated air supplied with disperses to supply in the hopper main body 20 through this porous plate 22 from internal perisporium opening 21.That is, the heated air of discharging from internal perisporium opening 21 spreads at porous plate 22 with by the space between the bottom internal perisporium of these porous plate 22 coverings along circumferentially reaching above-below direction, and is imported in the hopper main body 20 via a plurality of passage 22a.
In addition, in legend, show the shape of passage 22a is made toroidal, but also can make rectangular-shaped or other shapes such as ellipticity, slotted hole shape, hexagonal configuration.In addition, the arrangement mode of passage 22a also is not limited to the center of circle shown in the figure, during with the overlooking of hopper main body 20, and to be that the center is arranged as radial, also can be arranged as staggered or arranged side by side shape.And then, as such porous plate, be not limited to the such punching processing of passing through of legend and form a plurality of passages, also can make mesh-shape or netted porous plate.
In addition, the aperture of passage is different according to powder and granular material, comprises the powder body of the micro mist shape that departs from from average grain diameter sometimes, need not make the aperture that the powder body that can stop such micro mist shape passes through.
And then this porous plate 22 is as shown in Figure 1, can be set to cover near the following ora terminalis of bottom internal perisporium to the position of about 1/3～1/2 height of bottom internal perisporium, also can be set to cover the roughly whole of bottom internal perisporium.The degree of such porous plate 22 covering bottom internal perisporiums; According to the aperture opening ratio of the solid angle that the conical surface became of the bottom internal perisporium that forms the mortar shape, porous plate, aperture etc., be set at can be in hopper main body 20 roughly wholely disperse and supply with heated air to get final product.
And then; In addition, also can be so that the roughly concordant shape of internal perisporium face of the surface of porous plate 22 and hopper main body 20, or make the internal perisporium face of the surface ratio hopper main body 20 of porous plate 22 internal perisporium of hopper main body 20 made double-layer structural or step shape with the step-like mode that more is positioned at outer circumferential side.
The upper end of the upper side that is made into drum of hopper main body 20 is opening towards the top, freely is provided with in this upper end dismounting to be used for lid 20c that this opening is sealed airtightly.At the upper surface of this lid 20c, be provided with the attraction pipeline connecting portion that is connected with vacuum attraction pipeline 11, this vacuum attraction pipeline 11 is connected with vavuum pump (vacuum generator) 3 as the mechanism of decompressor.The peristome that the material of the material throw-in part of after being provided with on this attraction pipeline connecting portion and the lid 20c, stating 6 drops into storage tube 63 and is communicated with the interior side space of this hopper main body 20.In addition, be provided with gas discharge outlet 23 at this attraction pipeline connecting portion, this gas discharge outlet 23 is used for the gas that comprises moisture etc. that in hopper main body 20, produces is discharged towards vacuum attraction pipeline 11.
In addition; The top that also can be substituted in lid 20c is provided with the mode of the above-mentioned attraction pipeline connecting portion with gas discharge outlet 23, and the upper periphery portion that is employed in hopper main body 20 is provided with the mode that has towards the attraction pipeline connecting portion of the gas discharge outlet of these hopper main body 20 inner openings.
Be provided with hopper material sensors (material level (レ ベ Le) meter) 24 and temperature sensor (material layer is used sensor through temperature detection) 25 on the top of this hopper main body 20; This hopper material sensors 24 is used to detect the material material level that is stored in the powder and granular material in the hopper main body 20, and this temperature sensor 25 is as the testing agency of the temperature that detects the gas that has passed through to be stored in the powder and granular material layer in the hopper main body 20.
In the present embodiment, as follows: Hopper material sensor 24 by the presence or absence of powder material caused Oscillating arm for the limit switch on / off, thereby detecting the material within the hopper body 20 is full of material level material level is reduced to a predetermined material level, but as long as the hopper body 20 capable of detecting material level inside the material can be any material position.
Material layer through temperature detection with sensor 25 in this embodiment; Powder and granular material in being stored in hopper main body 20 is stored under the state till the full material level, with this test section set in the face of from the portion of the superiors of this powder and granular material to the space till the lid 20c of the upper end sealing of hopper main body 20.That is, this material layer is measured the atmosphere temperature of the superjacent air space (the non-storage space of material) that is stored in the powder and granular material layer in the hopper main body 20 with sensor 25 through temperature detection.
These hopper material sensors 24 and material layer through temperature detection with sensor 25 via holding wire etc. with after the CPU80 that is located at control panel 8 that states as control part be connected.
In addition; In legend; Show and connect lid 20c and hopper material sensors 24 and material layer are set, but also can be to connect the upper periphery wall of hopper main body 20 and hopper material sensors 24 is set and material layer passes through the mode of temperature detection with sensor 25 through the example of temperature detection with sensor 25.
In addition, the periphery in hopper main body 20 is provided with hopper periphery insulation portion 40,26.In this embodiment, by after the heated air supply unit 4 stated helical form gas heating part 40 and constitute hopper periphery insulation portion with the insulation 26 that the mode that covers this helical form gas heating part 40 is located at periphery.
As insulation 26, can adopt various foam class (foaming kind) insulations or fiber-like insulation, resinae insulation.In addition; Also can adopt the vacuum insulation spare that forms through following mode etc.: for example form core with fibers such as powder such as the urethane foam of porous matter, silica or glass fibres, with this core with the packaging material encapsulation of the metallic film of gas barrier properties etc. and carry out vacuum attraction.
Attraction direction upstream side (sides different with exhaust side) at this vavuum pump 3 is not imported into this vavuum pump 3 in order to make dust and volatile substance etc., perhaps for the gas of outside device, discharging from vavuum pump 3 is purified, is provided with filter 11a.
At this; The hopper main body 20 interior decompression states that caused by vavuum pump 3 are meant the vacuum state that becomes the pressure state that forces down than atmosphere in the hopper main body 20, but comprise that also the pressure in the hopper main body 20 temporarily become the above situation of atmospheric pressure owing to the importing of heated air.
In addition, also can replace vavuum pump 3, and adopt for example other vacuum generators such as injection apparatus.
This vavuum pump 3 for example can adopt and can the final vacuum in the hopper main body 20 be decompressed to the pump about 50kPa (abs)～4kPa (abs), is preferably employing and can be decompressed to the pump about 20kPa (abs)～4kPa (abs).In addition, vavuum pump 3 can be according to the capacity of hopper main body 20 etc., is provided with the short period about the several seconds and makes the exhaust velocities (capacity) that arrive the degree of specified vacuum degree in the hopper main body 20.
In addition, in legend, example only constitute vavuum pump 3 with one-level, but according to the capacity of hopper main body 20 and the final vacuum of expectation etc., for example also can adopt the multilevel hierarchy that a plurality of vavuum pumps are set.
In addition, at the attraction direction upstream side of vavuum pump 3,, be provided with the pressure sensor or Pressure gauge equal pressure meter, the atmospheric rilief valve etc. that are used to detect vacuum though omitted diagram.
Material throw-in part 6 is arranged on the top of the above-mentioned attraction pipeline connecting portion on the top of being located at hopper portion 2; In this embodiment; Possess: trap 60 captures the powder and granular material that transports via material carrier pipe 15 from the material reservoir of material hold-up vessel 9 grades of storing powder and granular material; First slide-valve 61, below this trap 60, linking to each other is provided with; With above-mentioned same attraction pipeline connecting portion, below this first slide-valve 61, linking to each other is provided with; Material drops into storage tube 63, and below this attraction pipeline connecting portion, linking to each other is provided with, and accepts the powder and granular material from trap 60, and temporary transient storage; And second slide-valve 65, this material drop into storage tube 63 below link to each other and be provided with.
First slide-valve 61 is following slidingtype valve gears: in the valve body housing, accommodate the slide valve with through-hole section and occlusive part free sliding, through the slide-valve drive division that is made up of cylinder etc. this slide valve is slided, thereby open and close.
The slide valve of this first slide-valve 61 slides mobile through above-mentioned slide-valve drive division; Thereby above-mentioned through-hole section is aimed at the outlet of trap 60; Between supply position and disconnect position, carry out switching controls; This supply position is meant; Make this outlet and up/down perforation attract the peristome of pipeline connecting portion and material to drop into the position that storage tube 63 is connected, this disconnect position is meant, the position of the peristome of the outlet of trap 60 and above-mentioned attraction pipeline connecting portion and connection that material drops into storage tube 63 being blocked through above-mentioned occlusive part.
Through-hole section and material that the peristome of above-mentioned attraction pipeline connecting portion is made the slide valve that makes first slide-valve 61 drop into the structure that storage tube 63 is communicated with; Gas discharge outlet 62 is set on this peristome, and this gas discharge outlet 62 is used for the gas that material drops in the storage tube 63 is discharged towards the vacuum attraction pipeline that is connected with this attraction pipeline connecting portion 12.
In material drops into storage tube 63, be provided with and be used to detect the input tube material sensor 64 that material that this material drops into storage tube 63 has or not.
This material drops into storage tube 63 and depends on the kind that drops into tube material sensor 64; But for example also can make transparent glass tube etc.; The once input action that its capacity carries out according to the detection that the material material level that is accompanied by the hopper material sensors 24 of being located at hopper main body 20 reduces is made as the degree that can in hopper main body 20, drop into.
Having or not as long as drop into the storage that tube material sensor 64 can test material drops into the powder and granular material in the storage tube 63, can be any device, for example can be electrostatic capacitive level-sensing device (noncontacting proximity sensor).
Second slide-valve 65 is and the same structure of above-mentioned first slide-valve 61 that have: slide valve has through-hole section and occlusive part; The valve body housing is accommodated this slide valve free sliding; And make slide-valve drive division that slide valve slides etc.
The slide valve of this second slide-valve 65 slides mobile through above-mentioned slide-valve drive division; Thereby above-mentioned through-hole section is aimed at the lower end outlet that material drops into storage tube 63; The peristome of this lower end outlet and the above-mentioned attraction pipeline connecting portion on the top of being located at hopper main body 20 and the above-mentioned peristome of lid 20c are communicated with; Between input position and disconnect position, carry out switching controls; This input position is meant, the position that the interior side space that makes material drop into storage tube 63 and hopper main body 20 is communicated with, and this disconnect position is meant; Material is dropped into the connection of above-mentioned peristome of peristome and lid 20c of lower end outlet and the above-mentioned attraction pipeline connecting portion of storage tube 63 through above-mentioned occlusive part and block, thereby material is dropped into the position that storage tube 63 and hopper main body 20 are separated airtightly.
In the material throw-in part 6 that adopts such structure, based on material request signal, to control by the CPU80 that is located at control panel 8 from hopper material sensors 24, the following execution dropped into action.
Do not export material request signal (pass signal) from hopper material sensors 24, and state from the material request signal (pass signal) of the input tube material sensor 64 of this material throw-in part 6 under; First slide-valve 61 and second slide-valve 65 are closed, and in material drops into storage tube 63, store the powder and granular material that ormal weight is arranged.
If exported the material request signal from hopper material sensors 24, then make the 66 open stipulated times of first magnetic valve, through vavuum pump 3 material being dropped in the storage tube 63 becomes vacuum state.
After first magnetic valve 66 is opened, if passed through the very first time of regulation, then above-mentioned second slide-valve 65 is opened, up to second time of having passed through regulation.That is, the slide valve of second slide-valve 65 is switched to above-mentioned input position, put in the hopper main body 20 of hopper portion 2 being stored in the powder and granular materials that material drops in the storage tube 63.
The above-mentioned very first time is set at, is equal extent roughly through making the open materials that produce of first magnetic valve 66 drop into the interior vacuum of vacuum and hopper main body 20 in the storage tubes 63.The capacity that material drops into storage tube 63 is compared very little with the capacity of hopper main body 20, and does not import gas etc. and moment reaches the specified vacuum degree, so the above-mentioned very first time can be below 1 second or the short time about the several seconds.
In addition, above-mentioned second time set is for putting into above the getting final product of time in the hopper main body 20 with all amounts that are stored in the powder and granular material in the material input storage tube 63.
Under above-mentioned state; The powder and granular material that material drops in the storage tube 63 is put in the hopper main body 20; And from the input tube material sensor of material throw-in part 6 64 output material request signals, but till closing to second slide-valve 65, do not drop into storage tube 63 and do not carry out the material supply to material.
If passed through the afore mentioned rules time, then first magnetic valve 66 and second slide-valve 65 are closed, driving material is carried with air blast 13 then, first slide-valve 61 is opened, up to the 3rd time of having passed through regulation.
Thus,, carry powder and granular material to trap 60, and be replenished to material input storage tube 63 from trap 60 from material hold-up vessel 9 via material carrier pipe 15.
The input of this powder and granular material, supply action are repeating during hopper material sensors 24 output material request signals.
As stated, carry out mode, can not destroy the decompression state that has formed the hopper main body 20 of regulation decompression state by vavuum pump 3 to the input action of the powder and granular material of hopper main body 20 through making the material throw-in part 6 that uses this embodiment.Thus, in hopper main body 20 in, of the back, can more effectively improve the heat drying efficient of the powder and granular material that is heated dried.
In addition, can drop into the material throw-in part 6 of material as not destroying the decompression state (vacuum breaking) in the hopper main body 20, be not limited to these parts in the legend, also can adopt the other materials throw-in part to hopper main body 20.In addition, also can replace such mode, and adopt following material throw-in part: the switching valve is set in the bottom of trap, in the time will opening and closing the valve opening, destroy the decompression state in the hopper main body 20.
Upper surface at valve body housing 70 is provided with material carrier pipe connecting portion 73; This material carrier pipe connecting portion 73 is connected with material carrier pipe 17, and the temporary transient storage hopper 19a that this material carrier pipe 17 is used on the processing machine that is arranged on resin molding machine 19 grades carries powder and granular material.Be connected with air suction tube 18 this temporary transient storage on hopper 19a, be provided with and above-mentioned same air blast at the end of this air suction tube 18.In addition, in material input storage tube of this temporary transient storage hopper 19a, set up moulding pusher side material sensors 19b.
In addition, on the top plate portion of valve body housing 70, separate predetermined distance along glide direction and be provided with the material that is communicated with the material discharge pipe 20a of hopper main body 20 and accept peristome and the material conveyor side peristome that is connected with material carrier pipe connecting portion 73.This predetermined distance does; With after the slide valve 71 stated when placing position of readiness; Make this through-hole section and these materials accept any all misalignment of peristome and material conveyor side peristome, can get final product through the interval of the end face (top plate portion) of this valve body housing 70 degree that the through-hole section of slide valve 71 is inaccessible and be made as.
This slide valve 71 slides mobile through container slide-valve drive division 72, between gauge position, position of readiness, transfer position, carry out switching controls, and this gauge position is meant, makes above-mentioned material accept the position of peristome and the connection of above-mentioned through-hole section; This position of readiness is meant, through above-mentioned occlusive part this material is accepted the inaccessible position of blocking of peristome; Said transfer position is meant, makes the connection of above-mentioned through-hole section and above-mentioned material conveyor side peristome and through above-mentioned occlusive part this material is accepted the inaccessible position of blocking of peristome.
Peripheral part at this metering transport box 74 is provided with container material sensor 76, and this container material sensor 76 is used to detect the storage material level of the powder and granular material that drops into from the material discharge pipe 20a of hopper main body 20.This container material sensor 76 detects the situation of in metering transport box 74, storing the powder and granular material that ormal weight is arranged as metrological service's performance function.
In addition; Be provided with gas communication portion 75 in the bottom of this metering transport box 74; This gas communication portion 75 stops the gas communication net that passes through of powder and granular material that the filters such as porous plastid of gas communication are constituted by making gas communication, in this gas communication portion 75, is provided with the gas communication pipe jointing part that is connected with gas communication pipeline 16.
In suction tube 16a, be equipped with second magnetic valve 77 that is used for this suction tube 16a switching as open and close valve; Externally be provided with among the air leading-in conduit 16b and above-mentioned same filter, and be equipped with the 3rd magnetic valve 78 that is used for this outside air intake duct 16b switching as open and close valve.
In having adopted the material discharge portion 7 of such structure, based on material request signal, control by the CPU80 that is located at control panel 8 from moulding pusher side material sensors 19b, carry out discharging operation as follows.
If exported the material request signal, then make metering transport box 74 move to above-mentioned gauge position from above-mentioned position of readiness through container slide-valve drive division 72 from moulding pusher side material sensors 19b.
At above-mentioned position of readiness, the above-mentioned through-hole section of slide valve 71 is inaccessible by the end face of valve body housing 70, under this state, second magnetic valve 77 of being located at suction tube 16a is opened, thereby the attraction through vavuum pump 3 makes in the metering transport box 74 and becomes vacuum state.In addition, at this position of readiness, the above-mentioned occlusive part through slide valve 71 seals the material discharge pipe 20a of hopper main body 20 airtightly.
This metering transport box 74 is when above-mentioned position of readiness moves to above-mentioned gauge position; The state of opening of second magnetic valve 77 is continued; At this gauge position; The above-mentioned through-hole section of slide valve 71 is communicated with the material discharge pipe 20a of hopper main body 20, and the powder and granular material in the hopper main body 20 is dropped into towards metering transport box 74.That is, metering transport box 74 is being kept under the situation of this vacuum state, is communicated with the material discharge pipe 20a of hopper main body 20.
At above-mentioned gauge position, exported full signal if be located at the container material sensor 76 of metering transport box 74, then make metering transport box 74 move to above-mentioned transfer position from above-mentioned gauge position.In addition, make second magnetic valve 77 close, make the 3rd magnetic valve 78 to open, moulding pusher side air blast (not shown) is driven, up to the 4th time through regulation.
At above-mentioned transfer position; The above-mentioned through-hole section of slide valve 71 is communicated with material carrier pipe connecting portion 73 via the above-mentioned material conveyor side peristome of being located at valve body housing 70; Through the above-mentioned occlusive part of slide valve 71, the material discharge pipe 20a of hopper main body 20 becomes by the state that seals airtightly.In addition, be accompanied by from the extraneous air of outside air intake duct 16b and import, the attraction air that the driving through moulding pusher side air blast brings, the powder and granular materials that are stored in the metering transport box 74 are carried to temporary transient storage hopper 19a via material carrier pipe 17.
Above-mentioned the 4th time set is for getting final product all amounts that are stored in the powder and granular material in the metering transport box 74 more than the time that temporary transient storage hopper 19a carries.
The material request signal that has passed through above-mentioned the 4th time and moulding pusher side material sensors 19b continues under the situation of output; Make second magnetic valve 77 open, make the 3rd magnetic valve 78 to close; Make above-mentioned metering transport box 74 be positioned at above-mentioned position of readiness, up to the 5th time of having passed through regulation.
The 5th time set be make in above-mentioned transfer position has been destroyed the metering transport box 74 of vacuum, become the specified vacuum state (with hopper main body 20 roughly with the vacuum state of degree) till the required time get final product.
If through above-mentioned the 5th time, then make metering transport box 74 move to above-mentioned gauge position, with above-mentioned same from above-mentioned position of readiness; Make the powder and granular material of storing ormal weight in the metering transport box 74,, then make metering transport box 74 move to above-mentioned transfer position from above-mentioned gauge position if container material sensor 76 has been exported full signal; In addition; Make second magnetic valve 77 close, make the 3rd magnetic valve 78 to open, moulding pusher side air blast is driven, up to having passed through above-mentioned the 4th time.
Through this metering, conveying action, powder and granular material is transported in the temporary transient storage hopper 19a, if exported full signal from moulding pusher side material sensors 19b, then stops metering, carries and move, and makes metering transport box 74 as above-mentioned, be positioned at position of readiness.
After, likewise, through material request signal, repeat above-mentioned metering, carry the execution of moving from above-mentioned moulding pusher side material sensors 19b.
As stated,, carry out mode, can not destroy the decompression state of hopper main body 20 that has formed the decompression state of regulation by vavuum pump 3 from the discharging operation of the powder and granular material of above-mentioned hopper main body 20 through making the material discharge portion 7 that uses this embodiment.Thus, in hopper main body 20, as after state, can more effectively improve the heat drying efficient of the powder and granular material that is heated dried.In addition, be accompanied by discharging operation, the powder and granular materials in the hopper main body 20 can not be exposed in the extraneous air etc.
In addition; The situation etc. of be controlled as metering in input, supply action and the material discharge portion 7 that carries out with different timings in the material throw-in part 6 at above-mentioned moulding pusher side air blast, carrying action down; Also can make air suction tube 18 carry air suction tube 14 to be connected with being connected in material, the material conveying is also used as to the material conveying of resin molding machine 19 with air blast 13 use air blast with air blast 13 via transfer valve etc.
In addition, can eject material discharge portion 7, be not limited to these parts of legend, also can adopt other materials discharge portion from the material of hopper main body 20 as not destroying the decompression state in (vacuum breaking) hopper main body 20.Perhaps, also can replace such mode, and adopt following material discharge portion: the bottom in hopper main body 20 is provided with hold-up vessel etc. via opening and closing valve, when the switching valve is open, destroys the decompression state in the hopper main body 20.
Perhaps, also can replace above-mentioned modes, for example be provided with directly or via temporary transient storage hopper etc. under the situation of mode of this hopper main body 20, adopt and the material throw-in part 6 same material discharge portions that constitute at the place, input port of the processing machine of resin molding machine 19 grades.Even through such mode, also become the decompression state that can not destroy in (vacuum breaking) hopper main body 20, and can eject structure from the material of hopper main body 20.
Heated air supply unit 4 possesses helical form gas heating part 40 and gas supply part 50, and this gas supply part 50 is to these helical form gas heating part 40 supply gas, and has the flow adjustment part.
Helical form gas heating part 40 possesses like Fig. 1 and shown in Figure 2: helical form gas piping 41 is set to helical form in the periphery of hopper main body 20 with the mode along circumferential coiling, as the gas ventilation road; And wire heater 42 (with reference to Fig. 2 (b)), have the linear heating element that is inserted in this helical form gas piping 41.This helical form gas heating part 40 in this embodiment, constitutes hopper periphery insulation portion as stated, and this wire heater 42 is also brought into play function as the heating arrangements of hopper periphery insulation portion.
The connecting portion of the end of this helical form gas piping 41 is shown in Fig. 2 (b); Be communicated with the internal perisporium opening 21 of hopper main body 20; On this connecting portion, be provided with gas temperature sensor 43, this gas temperature sensor 43 be used to detect this helical form gas heating part 40 outlet side gas temperature, promptly be imported into the temperature of the gas of hopper main body 20.
Helical form gas piping 41 is in this embodiment; As shown in Figure 1; With near the position upper end of the circumferential lateral surface of hopper main body 20 is cardinal extremity; Along the circumferential lateral surface setting of hopper main body 20, spread all over its up and down roughly whole and set, near the above-mentioned connecting portion at the position, bottom of its terminal and circumferential lateral surface of being located at hopper main body 20 is connected.That is, in this embodiment, helical form gas piping 41 spread all over hopper main body 20 the top that forms drum periphery and form the inverted cone shape the bottom periphery roughly whole and set.In addition, in legend, helical form gas piping 41 be wound as make adjacent pipeline be compared to each other near or butt.
This helical form gas piping 41 for example with internal diameter be about 4mm～30mm, pipeline length is that copper pipe etc. about 1m～10m is bent into helical form and forms.The internal diameter of such helical form gas piping 41 and pipeline length wait to set according to the gabarit shape of flow that imports the heated air in the hopper main body 20 or hopper main body 20 and get final product.
In addition, the base end part of this helical form gas piping 41 via joint between three members etc. with after the gas supply pipe 56 of the gas supply part 50 stated be connected.
The linear heating element of this wire heater 42 constitutes heating lines such as nichrome wire with the insulating materials lining, the length direction along this helical form gas piping 41 in helical form gas piping 41 disposes.
The linear heating element of this wire heater 42 also can spread all over from the above-mentioned base end part of helical form gas piping 41 helical form gas piping 41 length direction total length and set, also can for example set to arrive and surpass about 2/3 position at least from above-mentioned base end part.
In addition, the diameter of the linear heating element of this wire heater 42 can be for example to count about mm.In addition; The length that the length of the linear heating element of wire heater 42 is made as less than helical form gas piping 41 gets final product, and also can wait based on the caloric value according to the target heating-up temperature of settings such as the kind of powder and granular material or initial stage moisture rate and this linear heating element self and set.
The heater (gas heater structure) that comprises these wire heaters 42 and helical form gas piping 41 also can be, in above-mentioned copper pipe, insert the linear heating element of wire heater 42 after, as above-mentioned, make copper pipe be bent into helical form and form.
The wire heater 42 of this helical form gas heating part 40 is based on the mensuration temperature signal (detected temperatures) of gas temperature sensor 43; Carry out the control of the energising of ON/OFF control or PID control etc. through the CPU80 that is located at control panel 8, become predefined set point of temperature so that be supplied to the temperature of the heated air in the hopper main body 20.The afore mentioned rules temperature can be set based on waiting according to the capacity of the target heating-up temperature of settings such as the kind of powder and granular material or initial stage moisture rate, hopper main body 20 or to the discharge rate that next treatment process ((not shown) such as the temporary transient storage hopper 19a that on resin molding machine 19 or this resin molding machine 19, is provided with, other processing machines) is once discharged, but also can be about for example 80 ℃～160 ℃.
Like this; Constitute the heater that the gas that is supplied in the hopper main body 20 is heated through the helical form gas piping 41 that has inserted wire heater 42, thereby can heat gas effectively by wire heater 42 through helical form gas piping 41.Promptly; Contact effectively through the gas in the helical form gas piping 41 and the linear heating element of wire heater 42; Compare with the heaters such as heating cabinet of the heaters such as heater that for example are built-in with sheath heater or plate heater, band heat release fin; These heat exchanges can be carried out more efficiently, efficiently with this gas heating.Like this, can improve the efficiency of heating surface of gas,, can electric capacity be made lessly, can realize economize on electricityization, and can make this heater self miniaturization so compare with heaters such as for example above-mentioned heating cabinets.In addition, as this embodiment, along the circumferential lateral surface of hopper main body 20 and be provided with, can reduce heat loss etc. thus, and can the periphery of hopper main body 20 be heated.
In addition, as stated, adopt through 42 pairs of structures that heat through the gas in the helical form gas piping 41 of wire heater, so can improve response comparatively.That is, be used for being that the heater that gas heats is a linear heating element through the heating target in the helical form gas piping 41, so the thermal capacity of heater self is less, the intensification of heater self or cooling are rapider.The result; Can be accompanied by the change of the gas temperature of the change of increase and decrease, the external air temperature of the flow of the gas through helical form gas piping 41, outlet side (hopper side) that other interference cause, the gas temperature that the outlet (to the internal perisporium opening 21 of hopper main body 20 inner openings) of the helical form gas piping 41 that causes owing to the control of switching on to wire heater 42 is located more promptly chases after from set point of temperature.That is, difficult overregulating or less stress joint etc. can be controlled to be more stable temperature with the temperature of the gas that imports the heating in the hopper main body 20.
Promptly; At the heater that adopts heating box in the past, and carry out under the situation of the control that makes the flow increase and decrease that is supplied to the heated air in the hopper main body, especially when the gas than low discharge is heated; The integral body of the heaters such as sheath heater in being directed into the interior gas of case and being disposed at case contacts unevenly; Promptly do not carry out heat exchange, can expect contacting with the part of this heater and advancing, thereby derived along short circuit paths with integral body.As a result, produce the overheated of part at this heater sometimes, can expect this heater damage.In addition; Under the state that has produced such hot-spot; If flow is increased, then the temperature of outlet side sharply rises to set point of temperature above (overregulating) sometimes, can expect difficulty (otherwise can expect that also same phenomenon takes place) of stable temperature control ratio.And then, in the heater of such heating box, when the pipeline of deriving side is derived, can expect that also the pressure loss becomes big in the case.
On the other hand, the helical form gas heating part 40 according to the decompression type drying device 1 of this embodiment that has adopted said structure is possessed can prevent the problems referred to above.
And then; In this embodiment; Periphery in hopper main body 20 is provided with the helical form gas heating part 40 as the heating arrangements of hopper periphery insulation portion; Employing is configured in the upper periphery of hopper main body 20 with the cardinal extremity of this helical form gas heating part 40, and its end is configured in the structure of the periphery bottom of hopper main body 20.Therefore, the gas that is sent to helical form gas piping 41 is warming up to set point of temperature in the periphery of hopper main body 20 from the wire heater 42 of upper side in lower side is located at this pipe at leisure.The result; With for example with the cardinal extremity of helical form gas heating part and terminal up and down on the contrary the situation of configuration compare, can heat effectively through the powder and granular material that with the powder and granular material of the especially lower layer side in the hopper main body 20, promptly need fully carry out heat treated from the heat conduction of internal perisporium.
In addition,, be not limited to the helical form gas heating part 40 of above-mentioned that kind, also can adopt other heaters as the heater that the gas that is supplied in the hopper main body 20 is heated.For example, also can adopt heater to be provided in the gas heating part of case shape, through the heating cabinet of this heater in this case shape gas heating part with the structure of gas heating with sheath heater or plate heater etc.
Perhaps; Also can adopt the heater of following band heat release fin: will be as heater and a plurality of heat release fins of built-in planar pottery (semiconductor) heater or be attached to a plurality of heat release fins combinations of ceramic heater, form a plurality of gas communication road along the gas direction of passage.In addition, also can adopt above-mentioned heater in addition.
The above-mentioned gas source possesses in this embodiment: compressed air source 5, supply with compressed air; And import source 5A, will import to the extraneous air of atmosphere opening via filter 52b.
In addition, also can be provided for supplying with or block open and close valve such as compressed-air actuated magnetic valve to compressed air source 5.
On compressed air source 5, be connected with the end that dry air imports pipeline 51; Import on the pipeline 51 at this dry air; Distolateral from compressed air source 5 towards another; Be equipped with modified unit 51b, drier 51c, the 4th magnetic valve 51a successively, the 4th magnetic valve 51a is as the open and close valve that is used to supply with or block the dry air that imports via compressed air source 5.
As modified unit 51b, also can possess the adjuster of the pressure that is used to adjust compressed air (compressed gas) or be used to catch dust etc. filter, be used to little mist separator (oil mist filter) of catching vaporific wet goods etc.
Drier 51c is used to make above-mentioned compressed gas suitably dry, can be the drier of the simple types such as drier of macaroni yarn membrane type for example.For example can the dew point of the compressed gas that has passed through this drier 51c be made as low dew point for about-10 ℃～-40 ℃.
On the filter 52b that imports source 5A, be connected with an end on outside air intake duct road 52; On this outside air intake duct road 52, be equipped with the 6th magnetic valve 52a, the 6th magnetic valve 52a is as the open and close valve that is used to supply with or block the extraneous air that imports via filter 52b.
These dry airs import pipelines 51 and the other end separately, outside air intake duct road 52 via joint between three members etc., are connected with an end that imports lateral line 53.
Import on the other end of lateral line 53 at this, be connected with an end of many (being 2 in this embodiment) branch lines 54,55 (first branch line 54, second branch line 55) via joint between three members etc. respectively.
On first branch line 54, be equipped with needle valve 54a; This needle valve 54a is as the flow control valve that is used to adjust flow; On second branch line 55, be equipped with the 5th magnetic valve 55a, the 5th magnetic valve 55a is as being used to supply with or block the open and close valve through the gas of this second branch line 55.
Each branch line 54,55 the other end separately is connected with an end of heating part lateral line 56 via joint between three members etc., and the other end of this heating part lateral line 56 is connected with the above-mentioned cardinal extremity of the helical form gas piping 41 of helical form gas heating part 40.
In the gas supply part that has adopted said structure 50,, then can import pipeline 51 to importing the compressed gas (dry air) that lateral line 53 imports from compressed air source 5 via dry air if the 4th magnetic valve 51a is opened, the 6th magnetic valve 52a is closed.On the other hand, if the 4th magnetic valve 51a is closed, the 6th magnetic valve 52a is opened, then can import from the extraneous air that imports source 5A to importing lateral line 53 via filter 52b and outside air intake duct road 52.That is, through optionally these the 4th magnetic valve 51a and the 6th magnetic valve 52a being carried out open and close controlling, can optionally import dry air and extraneous air, these the 4th magnetic valve 51a and the 6th magnetic valve 52a are as supply gas switching mechanism performance function.In addition, if the 4th magnetic valve 51a and the 6th these both sides of magnetic valve 52a are closed, then become the structure of the importing that stops gas.
Like this; Can optionally switch dry air and extraneous air through adopting; And the mode of supplying with to helical form gas heating part 40, the mode that promptly can to hopper main body 20 in, import, thereby for example under the humidity condition with higher of extraneous airs such as summer, can import pipeline 51 importing dry airs via dry air; Wait in the winter time under the lower situation of the humidity of extraneous air, can import extraneous airs via outside air intake duct road 52.In addition; Also can adopt following control mode: for example when the startup of this decompression type drying device 1 etc., stage of start of run; Emphasis heats up the powder and granular materials that are stored in the hopper main body 20, imports the extraneous air of heating, be warmed up to a certain degree after; Emphasis makes powder and granular material dry, imports the dry air of heating.
In addition; In this embodiment; Example through the 4th magnetic valve 51a and the 6th magnetic valve 52a are carried out open and close controlling; Can optionally switch above-mentioned dry air or extraneous air and import the mode in the above-mentioned hopper main body 20, but to the structure that hopper main body 20 imports, also can adopt other structures so long as can optionally switch dry air or extraneous air.
Perhaps, also can replace such mode, and adopt a certain side's that can import dry air or extraneous air mode.That is, also can only possess dry air and import a certain side in pipeline 51 and the outside air intake duct road 52.
In this embodiment; In the action of this decompression type drying device 1; Adjustment is equipped on the needle valve 54a of first branch line 54; With can be often gas through the regulation flow, and the 5th magnetic valve 55a that is equipped on second branch line 55 carried out open and close controlling, thereby can increase and decrease the flow of the gas of importing.
If the 5th magnetic valve 55a is closed, stipulate that then the gas of flow can circulate to heating part lateral line 56 from gas source 5 (5A) via first branch line 54.On the other hand, if the 5th magnetic valve 55a is opened, then in the gas of the afore mentioned rules flow through first branch line 54, added that the gas of the flow of second branch line 55 can be from gas source 5 (5A) to 56 circulations of heating part lateral line.In addition; Below will make the 5th magnetic valve 55a be gas under the closing state, through first branch line 54 as small-flow gas, explain as flow gas greatly to make the 5th magnetic valve 55a be the gas state of opening under, through branch line 54,55.
Like this, through employing a plurality of branch lines 54,55 are set, therein at least one is provided with open and close valve 55a and makes the mode of flow increase and decrease, can constitute the flow adjustment part through easy structure.
In addition, first branch line 54 being constituted often can be through the gas of regulation flow, so the gas of this regulation flow is imported in the hopper main body 20 continuously.Thus; As after state; Drive vavuum pump 3 and with decompression in the hopper main body 20; Import the gas of heating simultaneously, thus with this heated air displacement at the surperficial emersion of powder and granular material and be evaporated to moisture in the hopper main body 20 etc., the while can come through the attraction of vavuum pump 3 to be discharged to outside the hopper main body 20 swimmingly.
In addition, thus, also can prevent to be used for the damage of wire heater 42 structures such as gas heater such as grade of the gas heating that imports etc.
And then; Through as above-mentioned, adopting the mode that a plurality of branch lines make the flow increase and decrease of gas that is provided with; Though structure is simpler and easy; But, set the diameter valve etc. of the diameter, open and close valve etc. of bar number and each pipeline of these branch lines, thereby the flow of the gas of importing is is fine increased and decreased according to increase and decrease amplitude and the increase and decrease stage etc. of the flow of expectation.
In addition, after in the example of the elemental motion stated, illustration through making the 5th magnetic valve 55a intermittently open, the mode that the flow of the gas of the heating that is directed into hopper main body 20 is intermittently increased, but be not limited to such mode.For example, also can be following mode: under the situation that the flow of the gas that makes importing increases, make the 5th magnetic valve 55a open continuously, under the situation that the flow of the gas that makes importing reduces, the 5th magnetic valve 55a is closed.
In addition; In this embodiment; Illustration as the flow adjustment part that is used to adjust to the flow of helical form gas heating part 40 gas supplied a plurality of branch lines 54,55 are set; The mode that open and close valve 55a is set on therein at least one and flow is increased and decreased, but so long as the structure that the flow of gas is increased and decreased can be an any structure.For example also can adopt following mode: make the 5th magnetic valve 55a switching timing when reducing when increasing different; Or the amount of passing through when opening is different; So that the increase and decrease of the flow of per stipulated time is carried out open and close controlling through higher speed ground, make the flow increase and decrease of the gas of importing.In this case, also above-mentioned a plurality of branch line can be set, and in the pipeline that gas passed through, open and close valve be set from the above-mentioned gas source.
Perhaps, also can replace being provided with the mode of above-mentioned a plurality of branch lines,, the flow rate regulating valves such as motor valve that can carry out aperture control are set in from the pipeline that gas passed through in above-mentioned gas source also perhaps except above-mentioned a plurality of difference pipeline is set.Also can make the flow increase and decrease of the gas of importing through aperture by the such flow rate regulating valve of CPU80 control.
In addition, as above-mentioned gas, being not limited to extraneous air or extraneous air is carried out modified and dry dry air, also can be gas or other non-active gas such as nitrogen, argon gas.
Guidance panel be configured for setting or import various setting operations with after state set cuit etc. in advance, or show various imposing a condition and the display operation portion of various operation modes etc.
Storage part is made up of various memories etc., the various programs of the control program of exercises such as the elemental motion of preserve through the operation of guidance panel imposing a condition of setting, import or input value, stating after being used to carry out or above-mentioned input action and discharging operation etc., the various tables of data of predefined exercises conditioned disjunction etc.
One example of the elemental motion of in the decompression type drying device 1 of this embodiment of above-mentioned formation, carrying out then, is described.
< the material initial stage is dropped into operation >
In when the startup of this decompression type drying device 1 etc., in hopper main body 20, store under the situation of the state (dummy status) that powder and granular material is arranged, carry out the material initial stage and drop into operation.
First slide-valve 61 of material throw-in part 6 and second slide-valve 65 is open, make the above-mentioned peristome connection of lid 20c on outlet and hopper main body 20 tops of trap 60.In addition, driving material is carried with air blast 13, and the powder and granular material that is stored in the material hold-up vessel 9 is carried to trap 60 via material carrier pipe 15.The powder and granular material that is delivered to trap 60 drops into storage tube 63, lid 20c etc. via each slide- valve 61,65, material, is put in the hopper main body 20.If hopper material sensors 24 detects full material level, then each slide- valve 61,65 cuts out, and the material conveying is stopped with air blast 13.
In addition, in hopper main body 20, storing has under the situation of powder and granular material, need not carry out this material initial stage and drop into operation.
In addition; In the time of also can dropping into operation at such material initial stage of execution; Hopper material sensors 24 detects full material level, and after second slide-valve 65 cuts out, in material drops into storage tube 63, stored the powder and granular material of ormal weight after; First slide-valve 61 cuts out, material is carried stopped with air blast 13.
< initial stage running operation >
As above-mentioned, in hopper main body 20, stored after the powder and granular material of ormal weight execution initial stage running operation.This initial stage running operation is following operation: make the powder and granular material that is stored in the hopper main body 20 be warming up to specified degree; And implement till at least fully having carried out handling (becoming till the temperature, moisture rate (moisture content) of regulation), do not carry out powder and granular material to the above-mentioned input action of hopper main body 20, and from the above-mentioned discharging operation of hopper main body 20 with the heat drying of the corresponding powder and granular material of discharge rate that is positioned at lower layer part.
That is, the driving through vavuum pump 3 is decompression in the hopper main body 20, and will be imported in the hopper main body 20 by the gas of heated air supply unit 4 heating.
At this moment, the helical form gas heating part 40 of heated air supply unit 4 is along the periphery setting of hopper main body 20, so Yi Bian prevent the heat release of hopper main body 20, Yi Bian with 20 heating of hopper main body.In addition, the heated air that as above-mentioned, is heated to set point of temperature is supplied in the hopper main body 20 via internal perisporium opening 21 and porous plate 22.That is,,, and carry out dried through the depressurization of vavuum pump 3 with the powder and granular materials heating that is stored in the hopper main body 20 through from the heat conduction of the internal perisporium of hopper main body 20 and the heated air of supplying with from the bottom.
Through importing above-mentioned heated air, the temperature of the gas through material layer, be that material layer passes through temperature detection and slowly rises with the detected temperatures of sensor 25 low temperature from room temperature (extraneous air temperature) degree.If this material layer passes through the threshold value that the temperature of gas surpasses predefined regulation, the 5th magnetic valve 55a of heated air supply unit 4 is closed, the flow of the gas of importing is reduced.
Like this; In this embodiment; The temperature of gas that to pass through the above-mentioned material layer is inferred the heat drying treatment state of powder and granular material as the governing factor of the regulation of the heat drying treatment state of the powder and granular material in the expression hopper main body 20 according to this temperature.
The threshold value of afore mentioned rules is based on discharge rate of once discharging according to the capacity of the target heating-up temperature of settings such as the kind of powder and granular material or initial stage moisture rate, hopper main body 20 or to next treatment process etc.; Experimental ground is perhaps set empirically and is got final product, and for example can be made as about 40 ℃～120 ℃.
In this initial stage running operation, to above before the above-mentioned threshold value, make the 4th magnetic valve 51a of heated air supply unit 4 and the 5th magnetic valve 55a open, above-mentioned big flow gas (heated air of maximum quantity of wind) is imported in the hopper main body 20.Thus, the powder and granular material that is stored in the hopper main body 20 is heated up rapidly.
In addition,, then be judged as the state that has been warming up to regulation, the 5th magnetic valve 55a is closed, reduce the flow of the gas that imports if surpass above-mentioned threshold value.That is, above-mentioned small-flow gas is imported in the hopper main body 20.Thus, the vacuums in the hopper main body 20 that the attraction through vavuum pump 3 forms improve, and the heat effect that the importing through depressurization and small-flow gas causes carries out the heat drying processing of powder and granular material effectively.
In other words, in this running operation,, carry out so that the control that powder and granular material heats up and attaches most importance at initial stage, in the stage in the end, carry out the control that improves at least with the aridity of the corresponding powder and granular material of discharge rate of lower layer part in its starting stage.
In addition, experimental ground is perhaps set empirically and is got final product according to the kind of the capacity of hopper main body 20 and discharge rate, powder and granular material and condition (initial stage moisture rate etc.) etc. the time of carrying out above-mentioned initial stage running operation.Perhaps; Also can adopt following mode: the temperature sensor that the temperature that detects the orlop portion that is stored in the material layer in the hopper main body 20 is set; Mensuration temperature signal (detected temperatures) based on this temperature sensor; Whether the material of differentiating the orlop portion in the hopper main body 20 carries out heat drying is handled the state up to regulation, and reports the end of initial stage running operation.
In addition, also can adopt following mode: when surpassing above-mentioned threshold value, the counting of the time movements such as timer of beginning CPU80, execution should be turned round operation the initial stage up to having passed through the stipulated time.
In addition; The intensification of the powder and granular material that in this initial stage running operation, carries out need not make all amounts of the powder and granular material that is stored in the hopper main body 20 be warming up to even temperature, and the temperature that the temperature that makes the foot that is stored in the powder and granular material in the hopper main body 20 play the powder and granular material about 4 one-tenth～7 one-tenth is warming up to regulation gets final product.In other words, also can for, through the heated air that imports from the bottom of hopper main body 20; In hopper main body 20, the mode with the thermograde that slowly raises to the lower layer part formation temperature from upper layer part makes each layer intensification; At least before the continuous running operation of stating after the beginning; Continuously during the running operation, carry out the operation that to turn round at the initial stage at this at any time, handle up to the heat drying of the powder and granular material of the ormal weight that has fully carried out discharging from orlop.
< operation continuously turns round >
Execution initial stage running operation is prepared if carry out running as above-mentioned, then transfers to continuous running operation.
In this turns round operation continuously; Through the material request signal (pass signal) of reception from the moulding pusher side material sensors 19b of the temporary transient storage hopper 19a on the top that is arranged at resin molding machine 19; Carry out above-mentioned discharging operation; And, through receiving material request signal (pass signal), carry out above-mentioned input action from hopper material sensors 24.
Drop into action through this, for example in hopper main body 20, drop into the new powder and granular material of room temperature degree, the temperature of having passed through the gas of above-mentioned material layer sharply descends, and reduces to below the above-mentioned threshold value.Like this, when being lower than this threshold value, the above-mentioned flow adjustment part of the gas supply part 50 of heated air supply unit 4 is controlled, increased the flow of the gas that imports.
For example, can adopt following mode: make the 5th magnetic valve 55a intermittently open, the amount of passing through with the gas that increases per stipulated time alternately imports above-mentioned big flow gas and small-flow gas.The recruitment of this heated air can be the corresponding amount of intensification energy with the powder and granular material of the new input of above-mentioned that kind.Thus, can further realize energy-conservationization.
The flow of the heated air through as above-mentioned, making importing increases, and the intensification of the powder and granular material of above-mentioned new input is carried out rapidly, and the temperature of having passed through the gas of above-mentioned material layer slowly rises.When this temperature surpasses above-mentioned threshold value, the above-mentioned flow adjustment part of the gas supply part 50 of heated air supply unit 4 is controlled, reduced the flow of the gas that imports.That is, same when turning round operation with the above-mentioned initial stage, the 5th magnetic valve 55a is closed, above-mentioned small-flow gas is directed in the hopper main body 20.Thus, with above-mentioned same, the vacuums in the hopper main body 20 improve, and the heat effect that the importing through depressurization and small-flow gas brings carries out the heat drying processing of powder and granular material effectively.
Below, likewise, drive vavuum pump 3 and with decompression in the hopper main body 20; Simultaneous is from the discharging operation of the powder and granular material of hopper main body 20 with to the input action of the powder and granular material of hopper main body 20; Control,, then increase the flow of the gas that imports so that be lower than above-mentioned threshold value if passed through the temperature of the gas of material layer; Surpass above-mentioned threshold value if passed through the temperature of the gas of material layer, then reduce the flow of the gas that imports.
As stated; Decompression type drying device 1 according to this embodiment; Can improve the heat drying efficient that is stored in the powder and granular material in the hopper main body 20, and realize energy-conservationization, can prevent the deterioration (oxidation, burn, decomposition, variable color etc.) of the overheated powder and granular material that causes etc. simultaneously.
In addition, as stated, on one side can control the temperature that is directed into the gas in the hopper main body 20; To become predefined set point of temperature; Import on one side the gas of heating, the powder and granular materials that are stored in the hopper main body 20 are carried out heat treated, so compare with the methods of heating treatment that heat conduction fin carries out of passing through in the past; Can significantly shorten start-up time, but and can significantly improve cleaning property and the storage capacity of powder and granular material in the hopper main body 20.
In addition, the increase and decrease that is directed into the flow of the heated air in the hopper main body 20 is not limited to the mode of this elemental motion example, can adopt above-mentioned variety of way.Perhaps, also can adopt the mode of the heated air of often supplying with ormal weight, replace this elemental motion example such, based on the mode of coming the flow of heated air is increased and decreased control as the material layer of above-mentioned controlling element through the temperature of gas.
Perhaps; Also can except the control mode of above-mentioned that kind, perhaps replace the control mode of above-mentioned that kind, when carrying out above-mentioned initial stage running operation, after the startup just of this decompression type drying device 1; Do not start vavuum pump 3; Perhaps under the state that starts vavuum pump 3, control heated air supply unit 4, in hopper main body 20, to supply with heated air through CPU80.At this moment, can be more than the atmospheric pressure in the hopper main body 20, perhaps also can be decompression state.In addition, at this moment, also can in hopper main body 20, supply with the heated air of above-mentioned big flow.If adopt in such a way, then can make the powder and granular material that is stored in the hopper main body 20 be warming up to the state of afore mentioned rules rapidly.
On the other hand; Also can be that the heat treated of the powder and granular material in the hopper main body 20 proceeds to after the specified degree (when the temperature of for example, having passed through the gas of above-mentioned material layer surpasses above-mentioned threshold value; Or when having passed through the stipulated time afterwards; Or when having passed through predefined duration of runs at initial stage), by CPU80 heated air supply unit 4 is controlled, under reduced pressure heated air is supplied in the hopper main body 20.At this moment, also can in hopper main body 20, supply with the heated air of above-mentioned low discharge.
In addition; Also can be, often keep watch on the discharging operation of material discharge portion 7, and carry out following control: when the time of not discharging surpasses predefined stipulated time by CPU80; The supply of heated air is stopped; On the other hand, when then carrying out discharging operation, the supply of heated air is begun once more.Thus, can realize energy-conservationization.
In addition, as stated, also can replace mode with dry air heating and importing; And employing is with the mode of extraneous air heating and importing; Perhaps also can be employed in start of run, with extraneous air heating and importing, the mode that then dry air is heated and imports.
And then, in above-mentioned elemental motion example, illustration before the operation that turns round in the early stage, carry out the above-mentioned material initial stage and drop into operation, the mode till becoming full material level, but be not limited to such mode.For example; Also can be following mode: replace the above-mentioned material initial stage to drop into operation, and carry out and the same action of above-mentioned initial stage running operation, Yi Bian repeat above-mentioned input action; Powder and granular material slowly is stored in the hopper main body 20 on one side, up to become full material level from dummy status.Thus; Till from dummy status to full material level; Drop into action during also can import heated air and carry out heat drying and handle while reducing pressure; And when carrying out the action of above-mentioned input, do not carry out the vacuum breaking in the hopper main body 20 yet, handle so can carry out the heat drying of powder and granular material effectively.
In addition; In this embodiment; In order to improve the heat drying efficient of the powder and granular material that is stored in hopper main body 20; The gas discharge outlet 23 that adopted the bottom that will be arranged on hopper main body 20 as the internal perisporium opening 21 of the gas introduction port of heated air, will be connected with vavuum pump 3 is arranged on the mode on the top of hopper main body 20; So that the heated air that is supplied in the hopper main body 20 through heated air supply unit 4 is passed through towards upper layer part from the lower layer part of powder and granular material layer, but also these gas introduction ports 21 and gas discharge outlet 23 can be set at other positions.Perhaps, also the porous plate of blanketing gas introducing port (internal perisporium opening) can be set, have the connecting portion that gas imports on the material discharge pipe, this connecting portion is connected with the end of helical form gas piping 41 and be arranged on.
And then; In this embodiment; But, the internal perisporium of hopper main body 20 is made as roughly level and smooth face, but for example for the heat treated of the powder and granular material of assistant heating gas supply part 4 for the cleaning property and the storage capacity of the inside of improving hopper main body 20; Perhaps in order to strengthen hopper main body 20 etc., also can be in set inside spaced walls or rib, the heat conduction fin etc. of hopper main body 20.
Then, with reference to other embodiments of the decompression type drying device of description of drawings powder and granular material of the present invention.
Fig. 3 and Fig. 4 are the key diagrams that is used to explain the decompression type drying device of second embodiment.
In addition, the difference of main explanation and above-mentioned first embodiment is given same mark for same structure, and is omitted its explanation or schematic illustration.
The decompression type drying device 1A of the powder and granular material of this embodiment and the main distinction of above-mentioned first embodiment are, the hopper periphery insulation portion of the 2A of hopper portion and the structure of heated air supply unit 4A.
In this embodiment, hopper periphery insulation portion adopts following structure: the periphery at hopper main body 20A is provided with periphery heater 27, is provided with and above-mentioned same insulation 26 with the mode that covers this periphery heater 27.In addition, in this embodiment, the hopper periphery temperature detection of temperature of peripheral part that is provided for detecting hopper main body 20A is with sensor 28.
Promptly; In above-mentioned first embodiment; Show the helical form gas heating part of heated air supply unit example, but in this embodiment, adopt the structure that the special-purpose periphery heater of hopper periphery insulation portion is set as the heating arrangements performance function of hopper periphery insulation portion.
This periphery heater 27 is based on the mensuration temperature signal (detected temperatures) of hopper periphery temperature detection with sensor 28; Carry out the energising of ON/OFF control or PID control etc. by CPU80 and control, so that the periphery of hopper main body 20A (constituting the framework periphery wall of hopper main body 20A) becomes predefined set point of temperature.The afore mentioned rules temperature can wait and sets according to carrying out target heating-up temperature that heat treated is heated to the powder and granular material of set point of temperature, for example can be made as about 40 ℃～160 ℃.
Like this, in this embodiment, different with above-mentioned first embodiment; Though adopted the heating arrangements of special-purpose hopper periphery insulation portion; But be based on the detected temperatures of hopper periphery temperature detection, carry out energising control, can realize energy-conservationization to periphery heater 27 with sensor 28.Promptly; After device has just started; The framework self of hopper main body 20A and the temperature that is stored in powder and granular material wherein are about room temperature, so be in than higher state based on the switch on current on time of periphery heater 27 of control of the detected temperatures of temperature sensor 28.On the other hand; The supply of the heated air through heated air supply unit 4A, the temperature of the powder and granular material layer in the hopper main body 20A slowly rises, and the periphery temperature of hopper main body 20A also slowly rises; So can reduce the current on time of periphery heater 27, realize energy-conservationization.
In addition; Be substituted in internal perisporium opening and the porous plate explained in above-mentioned first embodiment; The connecting portion of heated air supply unit is set in the bottom of material discharge pipe 20a, the gas introduction port 21A (also with reference to Fig. 4 (a)) to hopper main body 20A inner opening is set on this connecting portion.Shown in Fig. 4 (a), on this connecting portion, be provided with material layer orlop portion temperature detection with sensor 29.This material layer orlop portion temperature detection with sensor 29 for the temperature of the orlop portion of detecting the powder and granular material that in hopper main body 20A, is heated dried and be provided with; Can be following mode: based on the mensuration temperature signal (detected temperatures) of this material layer orlop portion temperature detection with sensor 29, whether heat drying have been handled the state of stipulating to the material of the orlop portion in the differentiation hopper main body 20A.In this case, also can be,, then postpone discharge or transfer to next treatment process for example if be lower than set point of temperature, carry out make from after the control that increases of the flow of gas of the heating that imports of the heated air supply unit 4A that states, to reach set point of temperature.Perhaps; Also can replace above-mentioned material layer through temperature detection with sensor 25, and with this material layer orlop portion temperature detection with sensor 29 as be used to detect the heat drying treatment state of representing powder and granular material, grasp as the testing agency of the temperature of the controlling element of stipulating.
In this embodiment, heated air supply unit 4A, as shown in Figure 4, possess helical form gas heating part 40A and with above-mentioned same gas supply part 50.
Helical form gas heating part 40A possesses: helical form gas piping 41A, and terminal and above-mentioned connecting portion is connected; Wire heater 42A has the linear heating element that sets along this helical form gas piping 41A.The structure of these helical form gas piping 41A and wire heater 42A is shown in Fig. 4 (b); Same with above-mentioned first embodiment, be employed in the interior structure that sets the linear heating element of wire heater 42A along the length direction of this helical form gas piping 41A of helical form gas piping 41A.In this embodiment, be not they to be provided in the periphery of hopper main body, but be provided in hopper main body 20A gas introduction port 21A near.In addition; End at helical form gas piping 41A is provided with and above-mentioned same gas temperature sensor 43; This gas temperature sensor 43 detects the gas temperature of the outlet side of this helical form gas heating part 40A, promptly is directed into the gas temperature of hopper main body 20A; With above-mentioned same,, carry out energising control to wire heater 42A by CPU80 based on the detected temperatures of this gas temperature sensor 43.
Through such helical form gas heating part 40A, also same with above-mentioned first embodiment, can improve the efficiency of heating surface to hopper main body 20A gas supplied, realize economize on electricityization, and the temperature of this gas is more promptly chased after from set point of temperature.
In the decompression type drying device 1A of this embodiment that adopts said structure, also carry out the exercises same with the decompression type drying device of in above-mentioned first embodiment, explaining 1, realize same effect.
In addition; In this embodiment; Illustration hopper periphery temperature detection is arranged on the mode of the upper periphery of hopper main body 20A with sensor 28, but also can adopt following mode: for example, on each periphery heater 27, temperature sensor is set according to the number that is provided with of periphery heater 27; Based on the detected temperatures of each temperature sensor, each periphery heater is controlled (multiple spot control).
In addition, also can cede territory periphery heater 27 to be set, temperature sensor is set, likewise carry out multiple spot control with above-mentioned at corresponding position respectively along the above-below direction branch of hopper main body 20A at a plurality of positions.
And then, also can be, as illustrated in above-mentioned first embodiment; Carry out at the discharging operation of often keeping watch on material discharge portion 7 by CPU80 and based on this discharging operation in the mode of supply control of heated air; When the time of discharging has surpassed predefined stipulated time, stop the supply of heated air, after this stops; Passed through again when not discharging yet after the predefined stipulated time, stopped energising (power supply) to periphery heater 27.Thus, can further realize energy-conservationization.And, then when carrying out discharging operation, carry out the supply that makes heated air and get final product to the control that the energising of periphery heater 27 begins once more.
And then; In addition; In this embodiment, show the example that constitutes hopper periphery insulation portion by periphery heater 27 and insulation 26, this periphery heater 27 spread all over hopper main body 20A circumferential lateral surface up and down roughly whole and be provided with; But also can be only periphery heater 27 be set, perhaps also can periphery heater 27 be set and only constitutes by insulation 26 in the lower, outer perimeter of hopper main body 20A.
In addition, the insulation of the gabarit of the helical form gas piping 41A that covers helical form gas heating part 40A can be set also, prevent heat release.
Then, be arranged at variation and a variation of gas introduction port of heated air supply unit of each decompression type drying device of above-mentioned each embodiment based on Fig. 5 explanation.
In addition, for giving same mark, and omit its explanation or schematic illustration with the same structure of above-mentioned each embodiment.
The heated air supply unit 4B of Fig. 5 (a) expression first variation; This heated air supply unit 4B possesses: gas heating part 40B; Be equipped on dry air and import pipeline 51, this dry air imports pipeline 51 and makes from the dry air with above-mentioned same compressed air source 5 and pass through; And the anti-locking mechanism of bridge joint; Be arranged at the downstream (gas introduction port 21 (21A) side of the bottom of hopper main body) of this gas heating part 40B; Make in heated air moment importing hopper main body 20 (20A); Make in the hopper main body 20 (20A) and boost rapidly, the powder and granular material layer in the hopper main body 20 (20A) is applied impact, thereby prevent bridge joint.
The anti-locking mechanism of above-mentioned bridge joint possesses: three-way switch valve 57 is disposed at the downstream of gas heating part 40B; And as the gas tank 45 of gas reservoir, be connected with a connector of this three-way switch valve 57, store gases at high pressure from compressed air source 5.
Remaining two connectors of three-way switch valve 57 are connected respectively with upstream side and downstream that dry air imports pipeline 51.In addition, the dry air in the downstream of three-way switch valve 57 importing pipeline 51 is connected with the gas introduction port 21 (21A) of the bottom of hopper main body.
This three-way switch valve 57 carries out switching controls by CPU80 program according to the rules, the gas stored condition that compressed air source 5 and gas tank 45 is communicated with make gas tank 45 and the gas importing state of gas introduction port 21 (21A) connection between switch.
In addition, in the downstream of gas heating part 40B, be provided with pressure-regulating valve 44 at the upstream side of three-way switch valve 57.
As illustrated in above-mentioned each embodiment; Be stored in the interior powder and granular material of hopper main body 20 (20A) according to discharging ormal weight as the request of resin molding machine 19 grades of supplying with target; But do not carrying out under the situation of this discharging operation, be stored in do not produce in the powder and granular material in the hopper main body 20 (20A) mobile.Particularly; In the decompression type drying device 1 of above-mentioned each embodiment, 1A, Yi Bian keep the decompression state of hopper main body, Yi Bian carry out the supply of heated air; Can carry out effective heat drying thus handles; But the phase negative side is compared with the device of the such gas of often supplying with big air quantity of in the past aeration type drying device, and the quantity delivered of heated air is few.As a result, carry out under the situation of above-mentioned discharging operation,,, consider that powder and granular material can adhere to each other according to the kind of powder and granular material along with the carrying out that heat drying is handled in long period not, and as piece, condense (bridge joint).
Therefore, in this variation, as following, termly gases at high pressure moments is imported in hopper main body 20 (20A), thereby prevent the bridge joint phenomenon.
At first, three-way switch valve 57 is made as the above-mentioned gas stored condition, the gases at high pressure that are adjusted into predefined pressure through pressure-regulating valve 44 are stored in the gas tank 45.
Then; When the discharging operation of material discharge portion 7 surpasses predefined stipulated time; Three-way switch valve 57 is switched to above-mentioned gas import state, make in gases at high pressure moment importing hopper main body 20 (20A) of heating, make in the hopper main body 20 (20A) and boost rapidly.
Above-mentioned discharging operation also can be for example to be kept watch on the on-off action of the material discharge valve (being slide valve 71 in above-mentioned example) of material discharge portion 7 by CPU80.And, also can be, when carrying out discharging operation; Make the time movement of CPU80 move and count; During till carry out next discharging operation, if passed through the afore mentioned rules time, then the gases at high pressure moment with heating imports in hopper main body 20 (20A).
In addition; Also can adopt following mode: for example to transferring to before the above-mentioned continuous running operation; Switching three-way transfer valve 57; Gas heating part 40B and gas introduction port 21 (21A) are communicated with, the heated air of regulation flow (for example above-mentioned big flow) is imported in hopper main body 20 (20A).
In addition, also can be, in above-mentioned continuous running operation; Before the temperature of having passed through the above-mentioned material layer surpasses above-mentioned threshold value, import the heated air of afore mentioned rules flow, on the other hand; When surpassing above-mentioned threshold value, make the time movement action of CPU80 and count, passed through the afore mentioned rules time if be not less than above-mentioned threshold value; Then three-way switch valve 57 is switched to the above-mentioned gas stored condition; And after in gas tank 45, storing the gases at high pressure of ormal weight, three-way switch valve 57 is switched to above-mentioned gas import state, and in gases at high pressure moment importing hopper main body 20 (20A) with heating.That is, also can replace the mode of the importing control of as above-mentioned, keeping watch on discharging operation and carrying out gases at high pressure, perhaps except aforesaid way, carry out the importing control of gases at high pressure through temperature based on material layer.
According to the decompression type drying device that possesses the heated air supply unit 4B that has adopted said structure; Moment through above-mentioned gases at high pressure imports boosting rapidly in the hopper main body 20 (20A) that causes; Can apply impact to the powder and granular material layer that is stored in the hopper main body 20 (20A), thereby make the change of powder and granular material layer.Therefore, can prevent powder and granular material adhering to or condense (bridge joint) of powder and granular material to the inwall of hopper main body.That is, be stored in powder and granular material layer in the hopper main body 20 (20A) and imported by the gas of moment and lift and float a little, each powder and granular material moves and change a little thus, coagulated state is destroyed, or prevent to condense in advance.
In addition; Termly gases at high pressure moments is imported to the timing controlled in the hopper main body 20 (20A) as above-mentioned that kind; Be not limited to above-mentioned example, also can adopt following mode: setting can detect the change of the powder and granular material in the hopper main body directly or indirectly, particularly be accompanied by the testing agency of minimizing of the storage material level of discharge, after the detection signal output of this testing agency; During till this detection signal of next time output; Whenever surpassing the afore mentioned rules time, i.e. the control through CPU80 termly with the interval of this stipulated time imports gases at high pressure moments.
As above-mentioned testing agency; The temperature sensor of the material discharge valve, test material layer that can enumerate above-mentioned material discharge portion 7 through temperature or the material sensors of minimizing of being located at the material sensors 19b of resin molding machine 19 sides and can detecting the storage material level of the powder and granular material in the hopper main body also can adopt other various testing agencies.
Perhaps, also can replace the mode of the change of the powder and granular material in the hopper main body of keeping watch on through testing agency like this, and preestablish the stipulated time that is spaced apart in gases at high pressure moment importing hopper main body 20 (20A).That is, also can be, no matter whether have the change of the powder and granular material in the hopper main body etc., all the interval with the predefined stipulated time regularly imports gases at high pressure.Thus, can prevent the bridge joint phenomenon through simple control.
In addition, the afore mentioned rules time also can be according to the kind of powder and granular material etc., experimental ground or empirical the time that is redefined for the degree that can prevent above-mentioned bridge joint phenomenon.Preferably can be set at, before becoming coagulated state, promptly produce before the bridge joint, carry out such time of importing of gases at high pressure.
In addition; The degree of boosting in the hopper that the pressure of the gas that the capacity of gas tank 45 is the import volume of the gas that imports moment, dry air that gas tank 45 and hopper main body 20 (20A) the are communicated with internal diameter that imports pipeline 51, moment imports, the importing of gas cause; Can be set at the degree that the powder and granular material layer in the hopper main body 20 (20A) is changed and get final product as above-mentioned according to the storage capacity that is stored in the powder and granular material in the hopper main body 20 (20A), kind and through the vacuum in the hopper main body 20 (20A) of vavuum pump 3 decompressions etc.In addition, the importing of these gases at high pressure also can for example be carried out with the moment about interior or several seconds at 1 second.
In addition, also can be that through the moment importing of above-mentioned gases at high pressure, the pressure in the hopper main body 20 (20A) temporarily becomes more than the atmospheric pressure, perhaps also can keep vacuum state.
In addition, also can be, import the downstream of the gas heating part 40B of pipeline 51, connect branched pipe, this branched pipe as bypass path, is imported pipeline 51 with the dry air in the downstream of gas tank 45 and is connected via transfer valve etc. at dry air.Adopt under the situation of such structure, also can be, before transferring to above-mentioned continuous running operation; Above-mentioned transfer valve is switched to the branched pipe side; Thereby import the gas of regulation flow, on the other hand, transfer to after the above-mentioned continuous running operation; Above-mentioned transfer valve is switched to gas tank 45 sides, likewise import gases at high pressure with prescribed manner moment with above-mentioned.
And then, also can import downstream or the above-mentioned bypass path setting and the above-mentioned same flow adjustment part of the gas tank 45 of pipeline 51 at dry air, with the increase and decrease control of above-mentioned traffic likewise.In this case, also can be, when the temperature of having passed through the above-mentioned material layer surpasses above-mentioned threshold value; Flow is reduced, and the counting of timer is begun, passed through the afore mentioned rules time if be not less than above-mentioned threshold value; Then import gases at high pressure, on the other hand, in process afore mentioned rules times prior; When the temperature of having passed through the above-mentioned material layer is lower than above-mentioned threshold value, flow is increased, and carry out and make timer such control of resetting.
The heated air supply unit 4C of Fig. 5 (b) expression second variation, this heated air supply unit 4C is also same with above-mentioned first variation, possesses the anti-locking mechanism of bridge joint.In addition, for structure and the action same, omit its explanation or schematic illustration with above-mentioned first variation.
The structure of the gas heating part of the heated air supply unit 4C of this variation is different with above-mentioned first variation.
That is, in this variation, the gas heating part 40C of heated air supply unit 4C is replaced by the heater of heating box, in gas tank 45A, sets heater such as sheath heater or plate heater and constitute gas heating part 40C.
In having adopted the heated air supply unit 4C of said structure, also can carry out and the same action of above-mentioned first variation, with above-mentioned same, can prevent the bridge joint phenomenon.
In addition, in this variation, same with above-mentioned first variation; Show in dry air importing pipeline 51 and set three-way switch valve 57; The example that on an one of which connector, has connected gas tank 45A, but also three-way switch valve 57 can be set, the introducing port and the export mouth of gas is set on gas tank 45A; Make they and dry air import pipeline 51 and be connected, the mode of open and close valve is set in the downstream of this export mouth.Thus, through this open and close valve is carried out open and close controlling, can switch and carry out gases at high pressure and import, stipulate of the supply of the heated air of flow to the moment of hopper main body 20 (20A) to storage from hopper main body 20 (20A) to gas tank 45A and gases at high pressure.
The heated air supply unit 4D of Fig. 5 (c) expression the 3rd variation, this heated air supply unit 4D is also same with above-mentioned first variation and second variation, possesses the anti-locking mechanism of bridge joint.In addition, for structure and the action same, omit its explanation or schematic illustration with above-mentioned first variation.
The structure of the gas heating part of the heated air supply unit 4D of this variation is different with above-mentioned first variation.
That is, in this variation, with the gas heating part 40D of heated air supply unit 4D as spiral helicine gas heating part 40D.That is, this helical form gas heating part 40D sets helical form gas piping 41 along the periphery of gas tank 45B, in this helical form gas piping 41, sets and has omitted illustrated and above-mentioned same linear heating element.
In addition, on gas tank 45B, be provided with: introducing port, be connected with the end of helical form gas piping 41, import gas; And export mouth, import pipeline 51 with the dry air in the downstream of this gas tank 45B and be connected; Be provided with open and close valve 57A in the downstream of this export mouth.
In addition, the periphery at helical form gas heating part 40D is provided with and above-mentioned same insulation 46.
In having adopted the heated air supply unit 4D of said structure, also can carry out and the same action of above-mentioned first variation, with above-mentioned same, can prevent the bridge joint phenomenon.That is,, can switch and carry out gases at high pressure and import, stipulate of the supply of the heated air of flow to the moment of hopper main body 20 (20A) to storage from hopper main body 20 (20A) to gas tank 45B and gases at high pressure through open and close valve 57A is carried out open and close controlling.
In addition; In this variation; Adopted helical form gas heating part 40D is wound on the structure on the periphery of gas tank 45B, helical form gas heating part 40D has been arranged on the mode with the approaching position of the gas direction of passage upstream side of gas tank 45B but also can adopt.That is, can replace the gas heating part of the heated air supply unit of above-mentioned first variation, and adopt the mode that is arranged on the helical form gas heating part of explaining in above-mentioned second embodiment.
In addition; In above-mentioned first variation to the, three variation; Heated air supply unit 4,4A that replacement was explained in above-mentioned each embodiment; And adopt the mode that each heated air supply unit 4B, 4C, 4D are set respectively, but except the heated air supply unit 4 in above-mentioned each embodiment, explained, 4A, these each heated air supply unit 4B, 4C, 4D can be set respectively also.In this case; Can be at the upstream side of each gas introduction port; Be connected each heated air supply unit 4B, 4C, 4D side by side respectively with each heated air supply unit 4,4A, the gas introduction port that each heated air supply unit 4B, 4C, 4D use perhaps also can be set in addition.In addition, in this case, each heated air supply unit 4B of these each variation, 4C, 4D also can be only with gases at high pressure moment importings in the above described manner as the anti-locking mechanism of bridge joint.
Perhaps, the heated air supply unit 4 that also can replace in above-mentioned each embodiment, explaining, the dry air of 4A import pipeline 51, and adopt the mode of heated air supply unit 4B that above-mentioned first variation to the, three variation are set, 4C, 4D.In this case, the 4th magnetic valve 51a of each heated air supply unit 4,4A also can be set, and make three-way switch valve 57 (or open and close valve 57A) as the 4th magnetic valve performance function.
And then; Viewpoint from the stability of the temperature of the heated air supplied with to hopper main body 20 (20A); Be preferably that the upstream side at gas tank is provided with the gas heating part as above-mentioned each variation; But the dry air that also can be employed in the heated air supply unit 4 explained in for example above-mentioned each embodiment, 4A imports in the pipeline 51 and is arranged on pressure-regulating valve 44 and the three-way switch valve of explaining in above-mentioned first variation 57, and gas tank 45 is connected the mode on this three-way switch valve 57.In this case; Can the pipeline length of helical form gas piping be made as abundant length; So that the temperature of the heated air of the outlet side of helical form gas piping becomes stable set point of temperature, and, also can set the curvature of canal path or pipeline etc. for the pressure loss that reduces gases at high pressure.
Fig. 5 (d) is illustrated in a variation that is fit to the gas introduction port of employing in the decompression type drying device of explaining in above-mentioned first variation to the, three variation that possesses heated air supply unit 4B, 4C, 4D.
In this variation, in the bottom of hopper main body 20B the gas that is connected with dry air importing pipeline 51 is set and imports connecting portion 58, import on connecting portion 58 at this gas gas introduction port 21B is set.
This gas imports connecting portion 58 has the material discharge pipe 20d that accommodates the bottom of being located at hopper main body 20B interior side space; Between the periphery and lower end periphery of material discharge pipe 20d; Formation can make the gap of heated air circulation; Mode to surround material discharge pipe 20d is provided with, and these gaps are as gas introduction port 21B performance function.That is, as the material discharge pipe 20d that accommodates the short tube shape and adopt the gas importing portion that imports the structure of the double pipe structure that connecting portion 58 constitutes by this material discharge pipe 20d and gas.
In having adopted the gas importing portion of said structure, import heated air (gases at high pressure) that pipeline 51 supplies with via around the material discharge pipe 20d via dry air, import in the hopper main body 20B from the lower end of material discharge pipe 20d.That is, can import heated air to the interior side of material discharge pipe 20d from the full Zhou Dynasty of the lower end periphery of material discharge pipe 20d.
Thus; Compare with each gas introduction port of in above-mentioned each embodiment, explaining; Can reduce the pressure loss that is directed into the heated air of hopper main body from the heated air supply unit; And do not become local importing for the powder and granular material layer in the hopper main body, can prevent to produce the bias current of this gas etc.
In addition, also can replace each gas introduction port of in above-mentioned each embodiment, explaining, and the gas importing portion that possesses this gas introduction port 21B is set.Replace under gas introduction port 21 explained in the first embodiment and situation about using porous plate etc. not being set, go up and get final product and the end of helical form gas piping is connected above-mentioned gas introduction port 21B.
Perhaps; As above-mentioned; Except the heated air supply unit of in above-mentioned each embodiment, explaining, also be provided with under the situation of heated air supply unit of first variation to the, three variation; Except each gas introduction port of in above-mentioned each embodiment, explaining, the gas importing portion that possesses this gas introduction port 21B can be set still.
Another other embodiments of the decompression type drying device of powder and granular material of the present invention then, are described based on Fig. 6 and Fig. 7.
In addition, the difference of main explanation and above-mentioned each embodiment is given same mark for same structure, and is omitted its explanation or schematic illustration.
The decompression type drying device 1B of Fig. 6 (a) expression the 3rd embodiment, this decompression type drying device 1B mainly are that the structure of hopper periphery insulation portion and heated air supply unit 4E of the 2B of hopper portion is different with above-mentioned each embodiment.
Heated air supply unit 4E possesses: with above-mentioned same helical form gas heating part 40E, in the periphery of the bottom that forms the inverted cone shape of hopper main body 20 along circumferential setting; And with above-mentioned same gas supply part 50.This helical form gas heating part 40E is different with above-mentioned first embodiment, to be cardinal extremity near the upper end of lower, outer perimeter, on this cardinal extremity, is connected with and above-mentioned same gas supply part 50.
In addition, on the upper periphery that forms drum of hopper main body 20, be provided with and above-mentioned same periphery heater 27.
Promptly; In this embodiment; Helical form gas heating part 40E is as the heating arrangements performance function of the hopper periphery insulation portion of the lower, outer perimeter of hopper main body 20, and periphery heater 27 is as the heating arrangements performance function of the hopper periphery insulation portion of the upper periphery of hopper main body 20.
In the decompression type drying device 1B of this embodiment that has adopted said structure, also carry out and the same exercises of above-mentioned each embodiment, realize same effect.
In addition, can periphery heater 27 be set yet, and be employed in the mode that upper periphery only is provided with insulation 26 in the upper periphery of hopper main body 20.Thus, can be through helical form gas heating part 40E to the lower, outer perimeter of hopper main body 20, promptly the periphery apart from the nearer side of material discharge portion be incubated, heats.
In addition, also can constitute, the top that forms drum of hopper main body 20 forms respectively with the bottom that forms the inverted cone shape, these upper and lowers is passed through bindings such as hinge, and freely fastening through switchings such as securing members.In this case, also can adopt following structure: when making upper side open, can the helical form gas heating part 40E that be located at the bottom be taken off from hopper main body 20 with the bottom internal perisporium.Thus, can improve the maintainability of helical form gas heating part 40E.
And then; In legend; Show the roughly whole example that sets along this lower, outer perimeter that helical form gas heating part 40E is spreaded all over the lower, outer perimeter of hopper main body 20, but also can for example can only be provided with only in the part setting of lower, outer perimeter at the lower side position.
In addition, shown in double dot dash line, the heated air supply unit 4B, 4C, 4D (in following the 4th embodiment to the six embodiments too) of above-mentioned first variation to the, three variation can be set in addition also.In this case, also can the gas importing portion that possess above-mentioned gas introducing port 21B be arranged on the bottom of hopper main body.
Perhaps, as above-mentioned, also can adopt mode that these heated air supply units 4B, 4C, 4D and heated air supply unit 4E are provided with side by side or in combination (in following the 4th embodiment to the six embodiments too).
The decompression type drying device 1C of Fig. 6 (b) expression the 4th embodiment, this decompression type drying device 1C mainly are that the structure of heated air supply unit 4F of the 2C of hopper portion is different with above-mentioned each embodiment.
Heated air supply unit 4F possesses: helical form gas heating part 40F, along roughly whole setting the up and down of the periphery of hopper main body 20C; And gas ventilation pipe 47, in hopper main body 20C along being provided with up and down.
The helical form gas piping 41 of helical form gas heating part 40F is different with above-mentioned first embodiment, to be cardinal extremity near the bottom of hopper main body 20C, on this cardinal extremity, is connected with and above-mentioned same gas supply part 50.In addition,, be wrapped in helical form on the periphery of hopper main body 20C towards upper side from this cardinal extremity, its end is connected with the connecting portion of the gas ventilation pipe 47 of the upper periphery of being located at hopper main body 20C, is communicated with gas ventilation pipe 47.
Substantial middle when gas ventilation pipe 47 is configured in overlooking of hopper main body 20C, the edge is provided with up and down in the interior side space of hopper main body 20C.
(transport the terminal part from the gas ventilation road of the gas of helical form gas piping 41) in the bottom of this gas ventilation pipe 47 and be provided with a plurality of gas discharge outlet 47a, these a plurality of gas discharge outlet 47a are distributed to heated air in the hopper main body 20C and discharge.In addition, this bottom forms bamboo hat shape or cone shape, and this bottom is conduct and the above-mentioned same FIFO umbrella performance function as rectification part also.
In addition, be provided with and above-mentioned same gas temperature sensor 43 in this bottom, this gas temperature sensor 43 detects the temperature that is discharged to the heated air in the hopper main body 20C.In addition, also can gas temperature sensor 43 be set at the connecting portion of the end of helical form gas piping 41.
Perhaps, shown in legend, also can replace the mode of helical form gas heating part being set, and be arranged on the helical form gas heating part 4A that explained in above-mentioned second embodiment, its end is connected with gas ventilation pipe 47 in the periphery of hopper main body 20C.
In the decompression type drying device 1C of this embodiment that adopts said structure, also carry out and the same exercises of above-mentioned each embodiment, realize same effect.
In addition; According to this embodiment; With the powder and granular material that is stored in the hopper main body 20C; Direct heating through the heated air of discharging from the bottom of gas ventilation pipe 47 and from the indirect of the heat transfer of the periphery (internal perisporium) of the periphery of gas ventilation pipe 47 and hopper main body 20C can more effectively be carried out heat drying and handle.
In addition; Also can be employed in whole or only a part of structure that helical form gas heating part 40F is set of the upper periphery side of hopper main body 20C; Whole or part in the periphery at the position that helical form gas heating part 40F is not set is provided with and above-mentioned same periphery heater, perhaps also can be employed in the structure that the position that helical form gas heating part 40F is not set only is provided with insulation.
The decompression type drying device 1D of Fig. 7 (a) expression the 5th embodiment, this decompression type drying device 1D mainly are that the structure of hopper periphery insulation portion and heated air supply unit 4G of the 2D of hopper portion is different with above-mentioned each embodiment.
Heated air supply unit 4G possesses: with above-mentioned same gas supply part 50; And 50 that be connected with this gas supply part, with the roughly same gas ventilation pipe 47A of above-mentioned the 4th embodiment.This gas ventilation pipe 47A is different with above-mentioned the 4th embodiment, in its pipe, sets heater such as sheath heater or tubular heater and constitutes gas heating part 40G.
In addition, in this embodiment, the periphery that is employed in hopper main body 20C is not provided with heating arrangements and the structure of insulation 26 only is set.
In the decompression type drying device 1D of this embodiment that has adopted said structure, also carry out and the same exercises of above-mentioned each embodiment, realize same effect.
Up and down the integral body setting and the above-mentioned same heating arrangements that also can spread all in addition, lower, outer perimeter or the circumferential lateral surface of hopper main body 20C.
The decompression type drying device 1E of Fig. 7 (b) expression the 6th embodiment, this decompression type drying device 1E mainly is that the structure of the 2E of hopper portion is different with above-mentioned second embodiment.
The hopper main body 20D of the 2E of hopper portion compares with the hopper main body of above-mentioned each embodiment, forms strip up and down, in the interior side space of this hopper main body 20D, disposes block 48.
In addition, in the upper end of this block 48 conus portion 48a is set, this conus portion 48a is distributed in the hopper main body 20D powder and granular material that drops into from material throw-in part 6 equably.In addition, rounding tapering 48b is set in the bottom of block 48, this rounding tapering 48b is distributed in the hopper main body 20D heated air of supplying with from the bottom of hopper main body 20D equably.
In the decompression type drying device 1E of this embodiment that has adopted said structure, also carry out and the same exercises of above-mentioned each embodiment, realize same effect.
In addition because block 48, but the storage capacity of hopper main body 20D reduce than above-mentioned each embodiment, but heat drying efficient can improve than device in the past.Promptly, block 48 is as distance member performance function; Can be with the powder and granular material in the impartial space between the internal perisporium of periphery that is stored in this block 48 and hopper main body 20D; Direct heating through the heated air supplied with from the bottom and from the heat transfer of the periphery (internal perisporium) of periphery heater 27, heating promptly.
In addition, also can be with being arranged in the interior side space of each hopper main body of explaining in above-mentioned first embodiment and the 3rd embodiment with the block of in this embodiment, explaining 48 same blocks.
In addition; In above-mentioned first embodiment, the 3rd embodiment and the 4th embodiment; The helical form gas piping that shows the tubulose through forming the cross section toroidal constitutes the example of the helical form gas heating part of the periphery of being located at the hopper main body, but is not limited to this structure.For example, also can be following mode: the peripheral part of hopper main body is made two double walls structure, and the partition wall with the spatial division of this two double wall is set, thereby constitute spiral helicine gas ventilation road with helical form.
In addition; In above-mentioned each embodiment; Testing agency as the controlling element of the regulation of the heat drying treatment state that is used to detect the powder and granular material in the expression hopper main body; Illustration the temperature sensor of test material layer through the temperature of the orlop portion of temperature or powder and granular material; And illustration the mode of controlling based on the detected temperatures of this temperature sensor, to the increase and decrease of the flow that is supplied to the heated air in the hopper main body and lead-in mode of heated air etc., but be not limited to such mode.
For example, passed through the testing agency of temperature of the gas of material layer as detection, also can adopt so that the temperature sensor that test section sets in the face of the modes in the vacuum attraction pipeline 11.Perhaps; Can detection be stored in also that the material layer upper layer part temperature detection of temperature is provided with as above-mentioned testing agency with sensor in the layer of upper layer part of the powder and granular material in the hopper main body, perhaps also can the material layer middle level portion temperature detection of the interior temperature of layer that detection is stored in the middle level portion of the powder and granular material in the hopper main body be provided with as above-mentioned testing agency with sensor.
And then; As above-mentioned; The controlling element that also can replace the regulation of the heat drying treatment state that will represent the powder and granular material in the hopper main body is made as temperature; And be provided for detecting the mode of the temperature sensor of this temperature, and adopt controlling element is made as humidity (dew point), and will be used to detect the mode that humidity (dew point) sensor of this humidity (dew point) is provided with as above-mentioned testing agency.Like this; Controlling element is made as under the situation of humidity (dew point); The situation grasp that humidity (dew point) is transferred to than downside from upper side is the rising of detected value, and humidity (dew point) is got final product for the decline of detected value from the situation grasp of transferring to upper side than downside.
And then; Controlling element as the regulation of the heat drying treatment state of the powder and granular material in the expression hopper main body; Be not limited to the temperature and humidity (dew point) of above-mentioned that kind; Also can be, for example with in the hopper main body or the vacuum of vacuum attraction pipeline etc. be made as controlling element, the pressure gauge that will be used to detect this vacuum is provided with as above-mentioned testing agency.Also can adopt following mode: Yi Bian such vacuum on one side as above-mentioned with the hopper main body in decompression, when carrying out the heat drying processing; Vacuum in the hopper main body is slowly near the specified vacuum degree; But the moisture that contains in the powder and granular material in the hopper main body etc. is slowly gasification through above-mentioned reduced pressure treatment, through this gasification, can not reach the specified vacuum degree sharp; So such specified vacuum degree is set as threshold value; When the detected vacuum of above-mentioned pressure gauge reached specified vacuum and spends, the heat drying treatment state that is estimated as powder and granular material had reached the state of expectation, and the flow of the gas of importing is reduced.In such mode, the corresponding a plurality of threshold values of the flow of the gas that also can set and import.
And then, in addition, as long as do not hinder these functions, just can be with suitably distortion, combinations such as each structure explained in above-mentioned each embodiment and each variation and action examples.
In addition; In above-mentioned each embodiment; Show request, discharge the example of mode of the ormal weight of the powder and granular material in the hopper main body, but in adopting the mode of once discharging its all amounts, also can use decompression type drying device of the present invention according to supply targets such as resin molding machines.
Description of symbols
1, the decompression type drying device of 1A, 1B, 1C, 1D, 1E powder and granular material
20,20A, 20B, 20C, 20D hopper main body (hopper)
21 internal perisporium openings (gas introduction port)
21A, 21B gas introduction port
22 porous plates
26 insulations (hopper periphery insulation portion)
27 periphery heaters (hopper periphery insulation portion, heating arrangements)
3 vavuum pumps (vacuum generator, the mechanism of decompressor)
4,4A, 4B, 4C, 4D, 4E, 4F, 4G heated air supply unit
40,40E, 40F helical form gas heating part (hopper periphery insulation portion, heating arrangements)
41 helical form gas pipings (gas ventilation road)
42 wire heaters
45,45A, 45B gas tank (gas reservoir)
47,47A gas ventilation pipe
47a gas discharge outlet (gas introduction port)
5 compressed air sources
57 three-way switch valves (open and close valve)
The 57A open and close valve
80CPU (control part).
Claims (7)
1. the decompression type drying device of a powder and granular material possesses: hopper, storage powder and granular material; And the mechanism of decompressor, with decompression in this hopper; The decompression type drying device of this powder and granular material is characterised in that to possess:
Hopper periphery insulation portion is arranged at the periphery of said hopper;
The heated air supply unit is supplied with the gas of heating in said hopper; And
Control part is controlled said heated air supply unit, makes its supply be heated to be the gas of predefined set point of temperature.
2. the decompression type drying device of powder and granular material as claimed in claim 1 is characterized in that,
Said heated air supply unit possesses:
The gas reservoir is stored the gas from compressed air source;
Open and close valve is arranged at the pipeline that this gas reservoir and said hopper are communicated with; And
Gas introduction port makes the gas that has passed through this pipeline be directed into the bottom in the said hopper;
Said control part makes said open and close valve open, and gas moment of said gas reservoir is imported in the said hopper, makes in this hopper and boosts rapidly.
3. according to claim 1 or claim 2 the decompression type drying device of powder and granular material is characterized in that,
Said hopper periphery insulation portion possesses:
Heating arrangements is arranged at the periphery of said hopper; And
Insulation is arranged at the periphery of this heating arrangements.
4. like the decompression type drying device of each described powder and granular material in the claim 1～3, it is characterized in that,
Said heated air supply unit possesses:
The gas ventilation road forms helical form; And
The wire heater disposes along this gas ventilation road in this gas ventilation road.
5. the decompression type drying device of powder and granular material as claimed in claim 4 is characterized in that,
Said gas ventilation road in the periphery of said hopper along circumferentially with the helical form setting.
6. like the decompression type drying device of claim 4 or 5 described powder and granular materials, it is characterized in that,
The end on said gas ventilation road is provided with porous plate with the mode along this internal perisporium in the internal perisporium upper shed of the mortar shape of hopper bottom on this internal perisporium, this porous plate covers this opening, and makes the gas dispersion of discharging from this opening.
7. like the decompression type drying device of each described powder and granular material in the claim 1～5, it is characterized in that,
Said heated air supply unit possesses:
The gas ventilation pipe, the substantial middle in said hopper is along being provided with up and down; And
Gas discharge outlet is arranged at the bottom of this gas ventilation pipe.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010035534A JP5461223B2 (en) | 2010-02-22 | 2010-02-22 | Vacuum drying equipment for granular materials |
| JP2010-035534 | 2010-02-22 | ||
| PCT/JP2011/053388 WO2011102420A1 (en) | 2010-02-22 | 2011-02-17 | Depressurization type drying device for powder and granular material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102762346A true CN102762346A (en) | 2012-10-31 |
| CN102762346B CN102762346B (en) | 2014-11-12 |
Family
ID=44483006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180009981.0A Active CN102762346B (en) | 2010-02-22 | 2011-02-17 | Depressurization type drying device for powder and granular material |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5461223B2 (en) |
| CN (1) | CN102762346B (en) |
| WO (1) | WO2011102420A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104494003A (en) * | 2014-12-16 | 2015-04-08 | 江苏宏远新材料科技有限公司 | Hopper drying machine for injection |
| CN104973355A (en) * | 2014-04-10 | 2015-10-14 | Posco公司 | Hopper and locked hopper device with the same |
| TWI682842B (en) * | 2015-06-12 | 2020-01-21 | 日商川田股份有限公司 | Heating device and control method of heating device |
| CN111344092A (en) * | 2017-10-31 | 2020-06-26 | 株式会社Ihi | Three-dimensional modeling apparatus and three-dimensional modeling method |
| CN111829333A (en) * | 2019-04-16 | 2020-10-27 | 亚台富士精机股份有限公司 | Drying system and control method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6473173B2 (en) * | 2014-12-25 | 2019-02-20 | 株式会社松井製作所 | Molding material supply system and molding material supply method |
| KR102271743B1 (en) * | 2015-12-31 | 2021-06-30 | 김희선 | Hopper Heater |
| KR101805857B1 (en) * | 2015-12-31 | 2017-12-07 | 김희선 | Hopper Heater |
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| CN111829333A (en) * | 2019-04-16 | 2020-10-27 | 亚台富士精机股份有限公司 | Drying system and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102762346B (en) | 2014-11-12 |
| WO2011102420A1 (en) | 2011-08-25 |
| JP2011167993A (en) | 2011-09-01 |
| JP5461223B2 (en) | 2014-04-02 |
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