CN102762346B - 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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- CN102762346B CN102762346B CN201180009981.0A CN201180009981A CN102762346B CN 102762346 B CN102762346 B CN 102762346B CN 201180009981 A CN201180009981 A CN 201180009981A CN 102762346 B CN102762346 B CN 102762346B
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Classifications
-
- 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 stores the hopper (hopper) of powder and granular material and to the mechanism of decompressor reducing pressure in this hopper.
Background technology
Decompression type drying device as powder and granular material in the past, adopted following mode: under the state that the hopper of storing powder and granular material is airtight, by the mechanism of decompressor, will in this hopper, reduce pressure, and by being arranged on thick and fast the heat conduction fin on the internal perisporium etc. of hopper, by the powder and granular material heating (for example, with reference to following patent documentation 1 and patent documentation 2) being stored in hopper.
In the decompression type drying device of such powder and granular material, for heat conduction fin is heated equably, need to adopt the heater that power consumption is larger, in addition, for the powder and granular material being stored in hopper is heated equably, heat conduction fin need to be set thick and fast, so the problem that exists the cost of device to uprise.In addition,, due to heat conduction fin being 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 arranges heating arrangements, in the inner side of this vacuum tank, from the inner peripheral surface of this vacuum tank, separated impartial interval and carry out configuration space part.In such device, illustrate and have: Yi Bian be stored in material in vacuum tank, between the inner peripheral surface by vacuum tank and distance piece, be dried on one side, so even if only heat by being located at the heating arrangements of the outer peripheral face of vacuum tank, also can be dried equably.
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 Patent
Summary of the invention
Invent problem to be solved
But, in the Minton dryer of recording at above-mentioned patent documentation 3, such as when the lower powder and granular materials such as pellets of synthetic resins of pyroconductivity being carried out to heat drying processing, this powder and granular material becomes heat-insulating material, can expect producing the temperature difference (thermograde) of powder and granular material in the direction of crosscut vacuum tank.In order to prevent the generation of such temperature difference, for the amount of at least discharging to subsequent processing of powder and granular material (all amounts or the ormal weight corresponding with request from subsequent processing) is heated to set point of temperature equably, need to make the interval between the outer peripheral face of distance piece and the inner peripheral surface of vacuum tank more approaching, have the problem can storage capacity diminishing of hopper.
In addition, only by conducting to heat from the heat of periphery, so especially when the startup of device, because the intensification of the housing self of vacuum tank consumes heat energy, so exist start-up time elongated, and then also elongated problem of the time that the amount of above-mentioned discharge is heated to set point of temperature equably.
The present invention makes in view of above-mentioned actual conditions, and its object is, although provide a kind of, is easy structure, also can improve the decompression type drying device of powder and granular material of the heat drying efficiency of powder and granular material.
For solving the scheme of problem
For reaching described object, 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 described hopper; Heated air supply unit is supplied with the gas of heating in described hopper; And control part, described heated air supply unit is controlled, make its supply be heated to be the gas of predefined set point of temperature.
In having adopted the present invention of 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 directly heat by heated air, can heat powder and granular material effectively.; by heated air, powder and granular material is heated; and by this heat treated and the reduced pressure treatment of being undertaken by the mechanism of decompressor; can make to be evaporated to from powder and granular material emersion moisture and volatile substance (being designated hereinafter simply as moisture etc.) and above-mentioned heated air displacement in hopper; and the attraction by the mechanism of decompressor is promptly discharged to outside hopper, can effectively carries out the heat drying of powder and granular material and process.
Such heated air also can and be supplied with extraneous air (atmosphere) heating, but by supplying with compressed air after lower modified of dew point etc., can carry out more efficiently the dry processing of the powder and granular material in hopper.
In addition, compare as main heat treated with the such heat of the decompression type drying device conduction of take in the past, start-up time in the time of can greatly shortening device startup, in addition, can shorten the time that the amount of at least discharging to subsequent processing of powder and granular material is heated to equably to set point of temperature.
And then, as decompression type drying device in the past, need in hopper, not be configured for thick and fast the heat conduction fin of heating powder and granular material, or heat conduction fin can be set.Therefore, can greatly improve the cleaning in hopper, and can effectively expand powder and granular material in hopper can storage capacity.
And then, in addition, by hopper periphery insulation portion, can prevent the heat release from hopper, so can will can be effectively used to the heat treated of powder and granular material to the heat of the heated air of supplying with in hopper, can carry out heat drying rapidly and process.
At this; above-mentioned powder and granular material refers to 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 the resin particles 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 process.
In addition, decompression state in the hopper reaching by the above-mentioned mechanism of decompressor refers to the vacuum state that becomes the pressure state forcing down than atmosphere in this hopper, but in the startup of this device, while being powder and granular material dry, become decompression state when normal, also can adjust the quantity delivered of heated air and the traffic attraction of the mechanism of decompressor (capacity).Or, be also included within the startup of this device, in hopper, temporarily become working method more than atmospheric pressure.
In the present invention, also can make described heated air supply unit possess: gas reservoir, store the gas from compressed air source; Open and close valve, is arranged at the pipeline that this gas reservoir and described hopper are communicated with; And gas introduction port, the gas that has made to pass through this pipeline is directed into the bottom in described hopper; By described control part, make described open and close valve open, gas moment of described gas reservoir is imported in described hopper, make to boost rapidly in this hopper.
By adopting such structure, the moment by gas imports boosting rapidly in the hopper causing, the powder and granular material layer being stored in hopper is applied to impact, can make the change of powder and granular material layer.Therefore, can prevent that powder and granular material is to condense (bridge joint) with powder and granular material that adhere to of hopper inwall.; powder and granular material in this device after heat drying is supplied with the request of target etc. according to resin molding machine etc.; towards supplying with target, discharge and carry; if but such discharge and conveying do not compare the long time; the powder and granular material layer in hopper does not produce mobile, change; along with the carrying out that heat drying is processed, different according to the kind of powder and granular material, there is powder and granular material to be attached to each other and be condensed into the trend of piece.According to the present invention who has adopted said structure, there is no like this movement of powder and granular material layer, in the situation of change, discharge and carry in the situation that does not compare the long time, by making gas moment importing make to boost rapidly in hopper, can destroy the coagulated state of the powder and granular material in hopper, or prevent from condensing in advance.
The action of the powder and granular material layer that the gas being imported by moment as described above causes, owing to having thick and fast powder and granular material with stacked state in hopper, so action that there will not be this stacked state to destroy, there will not be and stir such action, due to the importing of the gas of moment, layer integral body is lifted and floats a little in this wise, each powder and granular material moves a little, changes thus, can destroy coagulated state, or prevents from condensing in advance.
In addition, the capacity of gas reservoir is that the pressure of gas that imports 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, moment is, the degree of boosting in the hopper that the importing of gas causes, according to vacuum in the hopper that is stored in the storage capacity of the powder and granular material in hopper and kind, reduces pressure by the mechanism of decompressor etc., the powder and granular material layer in hopper is set as to the degree that can change as described above.
In addition, by above-mentioned control part, the open timing of above-mentioned open and close valve can be set as: the discharging operation of being located at the material discharge portions such as discharge baffle plate of hopper bottom such as supervision, after having carried out discharge, during before discharging next time, whenever surpassing predefined official hour, make it open.Or, also can pressure detection mechanism be set at the upstream side (gas reservoir side) of open and close valve, when the detected value of this pressure detection mechanism surpasses the force value of predefined regulation, make it open.
In addition, in the present invention, can be also that described hopper periphery insulation portion possesses: heating arrangements, is arranged on the periphery of described hopper; And insulation, be arranged on the periphery of this heating arrangements.
If adopt such structure, can more effectively prevent the heat release of hopper, and by the heating arrangements of this hopper periphery insulation portion, the intensification of the powder and granular material in can auxiliaring bucket.That is, in hopper, by the supply of depressurization and heated air, can directly and effectively to powder and granular material, carry out heat drying processing, and by the heat transfer of the periphery from hopper, can indirectly heat.
In addition, in the present invention, can be also, described heated air supply unit possesses: gas ventilation road, forms helical form; And wire heater, in this gas ventilation road, along this gas ventilation road, configure.
If adopt such structure, can be effectively by the gas-heated being supplied in hopper.; by the gas in spiral helicine gas ventilation road, effectively contact with wire heater; these heat exchanges with such as sheath heater or plate heater, be built-in with the heaters such as heating cabinet of the heaters such as heater of heat release fin and compare; can more effectively carry out, this gas can be heated effectively.
Like this, the efficiency of heating surface can be improved, so such as comparing with heaters such as above-mentioned heating cabinets, can make the heater that electric capacity is less, economize on electricityization can be realized, and can be by this heater self miniaturization.Therefore, this heater can be arranged on to the periphery of the position approaching with hopper or hopper etc., can reduce heat loss etc.
In addition, as described above, adopt and pass through wire heater by the structure of the gas-heated by spiral helicine gas ventilation road, thereby can relatively improve response.That is, for by the heating target by above-mentioned gas vent passage, be that the heater of gas-heated is wire, so the thermal capacity of heater self is less, the intensification of heater self or cooling are rapider.Result, even in the situation that there is increase and decrease by the flow of the gas in 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 in the situation of change, also be accompanied by this increase and decrease and change, can make the temperature of gas of the outlet side of this heater of causing to the channel electric controlled system of this wire heater more promptly chase after from the temperature of regulation.That is, difficult overregulating or less stress joint etc., can control the temperature that is supplied to the gas of the heating in hopper for more stable temperature.
In addition, in the present invention, can be also, in the periphery of described hopper along circumferentially with helical form, described gas ventilation road being set.
If adopt such structure, the wire heater along this gas ventilation road configuration can be also used as to the heating arrangements of hopper periphery insulation portion.In addition, the heating arrangements that is supplied to the gas-heated in hopper, in the position extremely approaching with hopper, can more effectively be reduced to heat loss.
In addition, in the present invention, also can be, make the end on described gas ventilation road in the internal perisporium upper shed that forms mortar shape of hopper bottom, on this internal perisporium, in the mode along this internal perisporium, porous plate is set, this porous plate covers this opening, and makes from the gas dispersion of this opening discharge.
If adopt such structure, can make the gas of heating disperse and the gas of heating is imported in hopper from the opening of the end on gas ventilation road.
In addition, in the present invention, can be also, described heated air supply unit possesses: gas ventilation pipe, and the substantial middle in described hopper is along setting up and down; And gas discharge outlet, be arranged at the bottom of this gas ventilation pipe.
If adopt such structure, process can be supplied in hopper along the heated gas in bottom gas ventilation pipe setting up and down and in hopper in hopper.
In addition, can the powder and granular material in hopper be heated by the heated air of discharging from gas discharge outlet, and can heat by the heat transfer of the periphery from this gas ventilation pipe.Thus, can more effectively to the powder and granular material in hopper, carry out heat drying processing.Especially, in the situation that be provided with the hopper periphery insulation portion that possesses heating arrangements, the direct heating of the heated air that discharge the bottom by from above-mentioned gas breather pipe and from the indirectly heating of the periphery of gas ventilation pipe and the heat transfer of hopper periphery, can more effectively carry out heat drying processing to the powder and granular material in hopper.
In addition, in the present invention, can be also, on above-mentioned heated air supply unit, flow adjustment part is set, this flow adjustment part adjustment be to the flow of the gas of supplying with in hopper.In this case, also can be, testing agency is set, this testing agency is for detection of the controlling element of regulation, the controlling element of this regulation represents the heat drying treatment state of the powder and granular material in hopper, and the detected value based on this testing agency is controlled above-mentioned flow adjustment part by above-mentioned control part, make the flow increase and decrease of the heated air supplied with, to become, be suitable for the flow that the heat drying of the powder and granular material that undertaken by this device is processed.Also can be, for example, drive the above-mentioned mechanism of decompressor on one side and will in above-mentioned hopper, reduce pressure, on one side above-mentioned flow adjustment part is controlled, 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, and this detected value during lower than above-mentioned threshold value, increases the flow of heated air.
Also can be, replace the above-mentioned mode that makes like that flow increase and decrease, or except the above-mentioned mode that makes like that flow increase and decrease, by above-mentioned control part, control heated air supply unit, when the startup of device, all amounts that drop into the powder and granular material in hopper are temperature left and right of extraneous air, so in order promptly to heat up, do not start the mechanism of decompressor, or starting under the state of the mechanism of decompressor, heated air is supplied in hopper.At this moment, in hopper, can be more than atmospheric pressure, or can be also decompression state.In addition at this moment, also the heated air compared with Wind Volume can be supplied in hopper.
On the other hand, also can be, by above-mentioned control part, control heated air supply unit, the heat treated of the powder and granular material in hopper (has for example been carried out after specified degree, when the detected value of above-mentioned testing agency surpasses the threshold value of predefined regulation, or while having passed through the stipulated time afterwards, or while having passed through the predefined duration of runs at initial stage), under reduced pressure heated air is supplied in hopper.At this moment, also the heated air of less air quantity can be supplied in hopper.
As above-mentioned controlling element, can enumerate along with the powder and granular material in hopper carries out heat drying processing and the various physical quantitys that change, such as enumerating time, temperature, humidity (dew point), pressure (vacuum) etc.And as the testing agency of detecting these controlling elements, employing can detect the mechanism of the change of these physical quantitys.
Invention effect
The decompression type drying device of powder and granular material of the present invention, by adopting structure as described above, although be easy structure, also can improve the heat drying efficiency of powder and granular material.
Accompanying drawing explanation
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) looks corresponding broken section approximate vertical view with the X-X alignment in Fig. 1, is (b) 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) are all for the key diagram of the heated air supply unit that this decompression type drying device possesses is described, (a) being the summary construction diagram that schematically shows this heated air supply unit, is (b) 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 respectively the heated air supply unit of the decompression type drying device that is applied to powder and granular material of the present invention, is (d) 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) are respectively all 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) are respectively all 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
Referring to accompanying drawing explanation embodiments of the present invention.
Fig. 1 and Fig. 2 are for the key diagram of decompression type drying device of the powder and granular material of the first embodiment is described.
In addition, in Fig. 1, Fig. 3～Fig. 7, with solid line, schematically show a part for the pipeline (gas piping, powder and granular material transfer pipeline etc.) that makes gas and powder and granular material circulation.
In addition,, in Fig. 2 (b), omit the diagram of insulation 26 described later.
The decompression type drying device 1 of the powder and granular material of legend as shown in Figure 1, possesses: hopper portion 2, possesses as the hopper main body 20 of storing the storagetank of powder and granular material; The mechanism of decompressor 3, by the interior decompression of this hopper main body 20; Heated air supply unit 4, the gas to the interior supply heating of hopper main body 20; And control panel 8.
Input side (upper side) in hopper portion 2 is provided with material throw-in part 6, in the discharge side (lower side) of hopper portion 2, is provided with material discharge portion 7.
In addition, in legend, this decompression type drying device 1 is assembled into frame-like, is arranged in bottom and has on the chassis 10 of scroll wheel.
The hopper main body 20 of hopper portion 2 is made by metal materials such as stainless steel or aluminium etc., and top forms drum, and bottom forms 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 powder and granular material for making to store is discharged successively swimmingly from lower side (lower layer side), 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 mortar shape, on this bottom internal perisporium, be provided with internal perisporium opening 21, this internal perisporium opening 21 is for will be through heated air supply unit 4 and heated gas imports in 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, material discharge pipe 20a near.
In addition, on this bottom internal perisporium, as shown in Figure 2 (a) shows, to cover internal perisporium opening 21 and to be provided with porous plate 22 along the mode of bottom internal perisporium.On this porous plate 22, offer a plurality of passage 22a, these passages 22a can circulate gas, and is made as the aperture of passing through that can stop the powder and granular material being stored in hopper main body 20.
The heated air of supplying with from internal perisporium opening 21 to the interior discharge of hopper main body 20 disperses to be supplied in hopper main body 20 by this porous plate 22.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 circumferential and above-below direction, and is imported in hopper main body 20 via a plurality of passage 22a.
In addition, in legend, show the shape of passage 22a is made to toroidal, but also can make other shapes such as rectangular-shaped or ellipticity, slotted hole shape, hexagonal configuration.In addition, the arrangement mode of passage 22a be also not limited to shown in figure, centered by the center of circle when the overlooking of hopper main body 20 and be arranged as radially, also can be arranged as shape staggered or arranged side by side.And then, as such porous plate, be not limited to legend such by punching processing, 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, sometimes comprises the bulk material of the micro mist shape departing from from average grain diameter, does not need to make the aperture that can stop the bulk material of such micro mist shape to pass through.
And then this porous plate 22 as shown in Figure 1, can be set to cover from the internal perisporium of bottom near ora terminalis the position of height of 1/3～1/2 left and right of bottom internal perisporium, also can be set to cover the roughly whole of bottom internal perisporium.Such porous plate 22 covers the degree of bottom internal perisporium, the solid angle becoming according to the conical surface that forms the bottom internal perisporium of mortar shape, the aperture opening ratio of porous plate, aperture etc., be set as can be in hopper main body 20 roughly wholely disperse and supply with heated air.
And then, in addition, also can be so that the internal perisporium face of the surface of porous plate 22 and hopper main body 20 concordant shape or make the internal perisporium face of the surface ratio hopper main body 20 of porous plate 22, in the step-like mode that is more positioned at outer circumferential side, the internal perisporium of hopper main body 20 be made to double-layer structural or step shape roughly.
The upper end of the upper side that is made into drum of hopper main body 20, towards upper opening, is freely provided with the lid 20c for this opening is sealed airtightly in this upper end dismounting.At the upper surface of this lid 20c, be provided with the suction pipeline connecting portion that is connected with vacuum attraction pipeline 11, this vacuum attraction pipeline 11 is connected with the vavuum pump (vacuum generator) 3 as the mechanism of decompressor.On this suction pipeline connecting portion and lid 20c, be provided with the material input storage tube 63 of material throw-in part 6 described later and the peristome being communicated with the interior side space of this hopper main body 20.In addition, at this suction pipeline connecting portion, be provided with gas discharge outlet 23, this gas discharge outlet 23 is for discharging the gas that comprises moisture etc. in the 20 interior generations of hopper main body towards vacuum attraction pipeline 11.
In addition, the top that also can be substituted in lid 20c arranges the mode of the above-mentioned suction pipeline connecting portion with gas discharge outlet 23, and adopts upper periphery portion in hopper main body 20 to arrange to have the mode towards the suction pipeline connecting portion of the gas discharge outlet of these hopper main body 20 inner openings.
On the top of this hopper main body 20, be provided with hopper material sensors (material level (レ ベ Le) meter) 24 and temperature sensor (material layer is by temperature detection sensor) 25, this hopper material sensors 24 is for detection of the material material level that is stored in the powder and granular material in hopper main body 20, and this temperature sensor 25 has passed through to be stored in the testing agency of temperature of the gas of the powder and granular material layer in hopper main body 20 as detection.
In the present embodiment, for following mode: the arm Oscillating that hopper material sensors 24 caused by having or not of powder and granular material is moving, carry out the ON/OFF of limit switch, thereby the material material level detecting in hopper main body 20 is full material level or has been reduced to regulation material level, as long as but can detect the material material level in hopper main body 20, can be any level-sensing device.
Material layer is used sensor 25 in the present embodiment by temperature detection, powder and granular material in being stored in hopper main body 20 is stored under the state till full material level, and this test section is set as the portion of the superiors in the face of from this powder and granular material till by the space of the lid 20c of the upper end sealing of hopper main body 20.That is, this material layer uses sensor 25 to measure 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 hopper main body 20 by temperature detection.
These hopper material sensors 24 and material layer use sensor 25 to be connected with the CPU80 as control part that is located at control panel 8 described later via holding wire etc. by temperature detection.
In addition, in legend, show and connect lid 20c and hopper material sensors 24 is set and material layer use the example of sensor 25 by temperature detection, but can be also the upper periphery wall of perforation hopper main body 20 and hopper material sensors 24 is set and material layer is used the mode of sensor 25 by temperature detection.
In addition, the periphery in hopper main body 20 is provided with hopper periphery insulation portion 40,26.In the present embodiment, by the helical form gas-heated portion 40 of heated air supply unit 4 described later and the insulation 26 of being located at periphery to cover the mode of this helical form gas-heated portion 40, form hopper periphery insulation portion.
As insulation 26, can adopt various foam class (foaming kind) insulations or fiber-like insulation, resinae insulation.In addition, also can adopt in the following way the vacuum insulation part that forms etc.: the fibers such as powder such as the urethane foam with Porous, silica or glass fibre form core, this core is encapsulated with the packaging material of the metallic film of gas barrier properties etc. and carry out vacuum attraction.
Vavuum pump 3 is connected with the gas discharge outlet 23 of being located at the top of hopper main body 20 via vacuum attraction pipeline 11, drive by depressurization, the powder and granular material being stored in hopper main body 20 is dried to processing, be configured for the mechanism of decompressor of hopper main body 20 interior decompressions.
At the attraction direction upstream side (sides different from exhaust side) of this vavuum pump 3, in order to make dust and volatile substance etc. not be imported into this vavuum pump 3, or for the gas of discharging from vavuum pump 3 is purified, be provided with filter 11a to device.
At this, decompression state in the hopper main body 20 being caused by vavuum pump 3 refers to the vacuum state that becomes the pressure state forcing down than atmosphere in hopper main body 20, but also comprises that the pressure in hopper main body 20 temporarily becomes situation more than atmospheric pressure due to the importing of heated air.
In addition, also can replace vavuum pump 3, and adopt such as other vacuum generators such as injection apparatus.
This vavuum pump 3 for example can adopt and the final vacuum in hopper main body 20 can be decompressed to 50kPa(abs)～4kPa(abs) left and right pump, be preferably employing and can be decompressed to 20kPa(abs)～4kPa(abs) left and right pump.In addition, vavuum pump 3 can be according to the capacity of hopper main body 20 etc., and the exhaust velocity (capacity) of degree that makes the vacuum of the interior arrival regulation of hopper main body 20 with the short period about the several seconds is set.
Such vavuum pump 3 can be also, even the gas of maximum quantity of wind is being imported to hopper main body 20 when interior by heated air supply unit 4 described later, also makes to become in hopper main body 20 pressure state forcing down than atmosphere.
In addition, in legend, example only with one-level, form vavuum pump 3, but according to the final vacuum of the capacity of hopper main body 20 and 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, although omitted diagram, be provided with pressure sensor or Pressure gauge equal pressure meter, atmospheric rilief valve etc. for detection of vacuum.
Material throw-in part 6 is arranged on the top of the above-mentioned suction pipeline connecting portion on the top of being located at hopper portion 2, in the present embodiment, possess: trap 60, the powder and granular material that trapping transports via material carrier pipe 15 from storing the material reservoir of material hold-up vessel 9 grades of powder and granular material; The first slide-valve 61 is connected and arranges below this trap 60; With above-mentioned same suction pipeline connecting portion, below this first slide-valve 61, be connected and arrange; Material drops into storage tube 63, below this suction pipeline connecting portion, is connected and arranges, and accepts the powder and granular material from trap 60, and temporarily stores; And second slide-valve 65, this material drop into storage tube 63 below be connected and arrange.
Trap 60 adopts and traps by attraction mode the structure that is stored in the powder and granular material in material hold-up vessel 9, and this air suction tube connecting portion is carried and is connected with air blast 13 with material via air suction tube 14.In addition, on the material carrier pipe connecting portion of trap 60, be connected with the material carrier pipe 15 for delivery of the material from material hold-up vessel 9.In addition, in Fig. 1, mark 14a is configured in material to carry attraction direction upstream side and the above-mentioned same filter with air blast 13.
The first slide-valve 61 is following slidingtype valve gears: in valve body housing, accommodate the slide valve with through-hole section and occlusive part free sliding, by the slide-valve drive division consisting of cylinder etc., this slide valve is slided, thereby open and close.
The slide valve of this first slide-valve 61 slides mobile by 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 refers to, make peristome and the material of this outlet and up/down perforation suction pipeline connecting portion drop into the position that storage tube 63 is connected, this disconnect position refers to, the position of the connection of the peristome of the outlet of trap 60 and above-mentioned suction pipeline connecting portion and material input storage tube 63 being blocked by above-mentioned occlusive part.
Through-hole section and material that the peristome of above-mentioned suction pipeline connecting portion is made the slide valve that makes the 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 discharged towards the vacuum attraction pipeline 12 being connected with this suction pipeline connecting portion for gas material being dropped in storage tube 63.
Vacuum attraction pipeline 12 is connected with the vacuum attraction pipeline 11 that is connected in above-mentioned vavuum pump 3, is provided with the first magnetic valve 66 as open and close valve for this vacuum attraction pipeline 12 is opened and closed in this vacuum attraction pipeline 12.
In material drops into storage tube 63, be provided with for detection of this material and drop into the input tube material sensor 64 that the material of 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 such as also making transparent glass tube etc., the once input action that the detection that its capacity reduces according to the material material level that is accompanied by the hopper material sensors 24 of being located at hopper main body 20 is carried out, being made as can be to the degree of hopper main body 20 interior inputs.
As long as drop into the nothing that has that tube material sensor 64 can test material drops into powder and granular material in storage tube 63, can be any device, can be for example electrostatic capacitive level-sensing device (noncontacting proximity sensor).
The second slide-valve 65 is structures same with above-mentioned the first slide-valve 61, has: slide valve, has through-hole section and occlusive part; 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 by 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, this lower end outlet and the peristome of above-mentioned suction pipeline connecting portion and the above-mentioned peristome of lid 20c of being located at the top of hopper main body 20 are communicated with, between input position and disconnect position, carry out switching controls, this input position refers to, the position that the interior side space that makes material drop into storage tube 63 and hopper main body 20 is communicated with, this disconnect position refers to, the connection that material is dropped into the above-mentioned peristome of the lower end outlet of storage tube 63 and the peristome of above-mentioned suction pipeline connecting portion and lid 20c by above-mentioned occlusive part is blocked, thereby material is dropped into storage tube 63 and hopper main body 20 separated position airtightly.
In adopting the material throw-in part 6 of such structure, the material request signal based on from hopper material sensors 24, is controlled by the CPU80 that is located at control panel 8, and following execution dropped into action.
Do not exporting under material request signal (pass signal) from hopper material sensors 24 and the state from the material request signal (pass signal) of the input tube material sensor 64 of this material throw-in part 6, the first slide-valve 61 and the second slide-valve 65 are closed, and in material drops into storage tube 63, have the powder and granular material of ormal weight.
If exported material request signal from hopper material sensors 24, made for the first open stipulated time of magnetic valve 66, by vavuum pump 3, material being dropped in storage tube 63 becomes vacuum state.
After making as mentioned above the first magnetic valve 66 open, if passed through the very first time of regulation, above-mentioned the second slide-valve 65 is opened, until passed through the second time of regulation.That is, the slide valve of the second slide-valve 65 is switched to above-mentioned input position, the powder and granular material being stored in material input storage tube 63 is put in the hopper main body 20 of hopper portion 2.
The above-mentioned very first time is set as, by making vacuum in the open material input storage tube 63 producing of the first magnetic valve 66 and the vacuum in hopper main body 20 for equal extent roughly.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 vacuum of regulation, so the above-mentioned very first time can be the short time about 1 second following or several seconds.
In addition, above-mentioned the second time is set as all amounts that are stored in material and drop into the powder and granular material in storage tube 63 to be put into time in hopper main body 20 above.
Under above-mentioned state, the powder and granular material that material drops in storage tube 63 is put in hopper main body 20, and export material request signals from the input tube material sensor 64 of material throw-in part 6, but till the second slide-valve 65 cuts out, to material, do not drop into storage tube 63 and do not carry out material supply.
If passed through the afore mentioned rules time, the first magnetic valve 66 and the second slide-valve 65 are closed, then drive material to carry with air blast 13, the first slide-valve 61 is opened, until passed through the 3rd time of regulation.
Thus, via material carrier pipe 15, from material hold-up vessel 9, to trap 60, carry powder and granular material, and be replenished to material input storage tube 63 from trap 60.
The input of this powder and granular material, supply action are repeating during hopper material sensors 24 output material request signals.
As mentioned above, by making material throw-in part 6 by present embodiment, undertaken, to the mode of the input action of the powder and granular material of hopper main body 20, can not destroying the decompression state that has been formed the hopper main body 20 of regulation decompression state by vavuum pump 3.Thus, in hopper main body 20 is interior, as described later, can more effectively improve the heat drying efficiency that is heated the dry powder and granular material of processing.
In addition, as not destroying the decompression state (vacuum breaking) in hopper main body 20, can to hopper main body 20, drop into the material throw-in part 6 of material, be not limited to these parts in legend, also can adopt other materials throw-in part.In addition, also can replace such mode, and adopt following material throw-in part: switching valve is set in the bottom of trap, in the time opening and closing valve opening, destroy the decompression state in hopper main body 20.
Material discharge portion 7 is arranged on the below of the material discharge pipe 20a that links the bottom that is formed at hopper main body 20, possesses: metering transport box 74, accept the powder and granular material of discharging from the material discharge pipe 20a of the lower end outlet as hopper main body 20; And slidingtype valve gear, this metering transport box 74 is moved.This slidingtype valve gear possesses: slide valve 71, the upper end of affixed metering transport box 74; Valve body housing 70, free sliding ground supporting slide valve 71; Container slide-valve drive division 72, by for making cylinder that slide valve 71 slides etc. form (also with reference to Fig. 2 (b)).
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 this material carrier pipe 17 is carried powder and granular material for the temporary transient storage hopper 19a on the processing machine towards being arranged on resin molding machine 19 grades.This temporary transient storage on hopper 19a, be connected with air suction tube 18, at the end of this air suction tube 18, be provided with and above-mentioned same air blast.In addition, in dropping into storage tube, this temporary transient material of storing hopper 19a set up moulding pusher side material sensors 19b.
In addition,, on the top plate portion of valve body housing 70, along glide direction, separate predetermined distance and be provided with the material being communicated with the material discharge pipe 20a of hopper main body 20 and accept peristome and the material conveyor side peristome being connected with material carrier pipe connecting portion 73.This predetermined distance is, when slide valve 71 described later is placed in to position of readiness, make this through-hole section and these materials accept any all misalignment of peristome and material conveyor side peristome, and be made as can be by this valve body housing 70 end face (top plate portion) by the interval of the degree of the through-hole section obturation of slide valve 71.
Slide valve 71 has, and through-hole section is accompanied by the slip of being undertaken by container slide-valve drive division 72 and moves, and accepts peristome and material conveyor side peristome is communicated with above-mentioned material; And occlusive part, above-mentioned material is accepted to opening port blocking.
This slide valve 71 slides mobile by container slide-valve drive division 72, carry out switching controls between gauge position, position of readiness, transfer position, and this gauge position refers to, makes above-mentioned material accept the position of peristome and the connection of above-mentioned through-hole section; This position of readiness refers to, by above-mentioned occlusive part, this material is accepted to the position that opening port blocking blocks; Described transfer position refers to, makes above-mentioned through-hole section and above-mentioned material conveyor side peristome be communicated with and by above-mentioned occlusive part, this material be accepted to the position that opening port blocking blocks.
Metering transport box 74 makes its upper end opening aim at the above-mentioned through-hole section of slide valve 71, and is fixed in the lower surface of slide valve 71.That is,, at above-mentioned gauge position, the material discharge pipe 20a of this metering transport box 74 and hopper main body 20 is communicated with; At above-mentioned position of readiness, the upper end opening of this metering transport box 74 is inaccessible by the end face of valve body housing 70; At above-mentioned transfer position, this metering transport box 74 and material carrier pipe 17 are communicated with.
Peripheral part at this metering transport box 74, is provided with container material sensor 76, the storage material level of the powder and granular material that this container material sensor 76 drops into for detection of the material discharge pipe 20a from hopper main body 20.This container material sensor 76, as metrological service's performance function, detects the situation that has the powder and granular material of ormal weight in metering transport box 74.
In addition, in the bottom of this metering transport box 74, be provided with gas communication portion 75, this gas communication portion 75 stops the gas communication net passing through of powder and granular material maybe can make the filters such as porous plastid of gas communication form by making gas communication, is provided with the gas communication pipe jointing part being connected with gas communication pipeline 16 in this gas communication portion 75.
Gas communication pipeline 16 is configured to the air attracting in metering transport box 74, or extraneous air is imported in metering transport box 74, in legend, branch into the suction tube 16a that is connected with vacuum attraction pipeline 11 and for importing the outside air intake duct 16b of extraneous air.
In suction tube 16a, be equipped with the second magnetic valve 77 as open and close valve for this suction tube 16a is opened and closed, externally in air leading-in conduit 16b, be provided with and above-mentioned same filter, and be equipped with the 3rd magnetic valve 78 as open and close valve for this outside air intake duct 16b is opened and closed.
In having adopted the material discharge portion 7 of such structure, the material request signal based on from moulding pusher side material sensors 19b, is controlled by the CPU80 that is located at control panel 8, carries out as follows discharging operation.
If 19b has exported material request signal from moulding pusher side material sensors, by container slide-valve drive division 72, make to measure transport box 74 and move to above-mentioned gauge position from above-mentioned position of readiness.
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, the second magnetic valve 77 of being located at suction tube 16a is opened, thereby the attraction by vavuum pump 3 makes to measure in transport box 74 and becomes vacuum state.In addition,, at this position of readiness, the above-mentioned occlusive part by slide valve 71 seals the material discharge pipe 20a of hopper main body 20 airtightly.
When this metering transport box 74 moves to above-mentioned gauge position from above-mentioned position of readiness, the state of opening of the 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 hopper main body 20 is dropped into towards metering transport box 74.That is, metering transport box 74, in the situation that maintaining this vacuum state, is communicated with the material discharge pipe 20a of hopper main body 20.
At above-mentioned gauge position, if be located at the container material sensor 76 of metering transport box 74, exported full signal, make to measure transport box 74 and move to above-mentioned transfer position from above-mentioned gauge position.In addition, make the second magnetic valve 77 close, make the 3rd magnetic valve 78 to open, moulding pusher side air blast (not shown) is driven, until the 4th time through stipulating.
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, by the above-mentioned occlusive part of slide valve 71, the material discharge pipe 20a of hopper main body 20 becomes the state being sealed airtightly.In addition, be accompanied by from the extraneous air of outside air intake duct 16b and import, the attraction air that the driving by moulding pusher side air blast brings, the powder and granular material being stored in metering transport box 74 is carried to temporary transient storage hopper 19a via material carrier pipe 17.
Above-mentioned the 4th time is set as the time that all amounts that are stored in the powder and granular material of metering in transport box 74 can be carried to temporary transient storage hopper 19a above.
The material request signal that has passed through above-mentioned the 4th time and moulding pusher side material sensors 19b continues in the situation of output, make the 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, until passed through the 5th time of regulation.
The 5th time be set as making above-mentioned transfer position destroyed required time till becoming the vacuum state (with hopper main body 20 roughly with the vacuum state of degree) of regulation in the metering transport box 74 of vacuum.
If through above-mentioned the 5th time, make to measure transport box 74 and move to above-mentioned gauge position from above-mentioned position of readiness, with above-mentioned same, make to measure the powder and granular material of the interior storage ormal weight of transport box 74, if container material sensor 76 has been exported full signal, make to measure transport box 74 and move to above-mentioned transfer position from above-mentioned gauge position, in addition, make the second magnetic valve 77 close, make the 3rd magnetic valve 78 to open, moulding pusher side air blast is driven, until passed through above-mentioned the 4th time.
By this metering, conveying action, powder and granular material is transported in temporary transient storage hopper 19a, if exported full signal from moulding pusher side material sensors 19b, stops metering, carries action, makes to measure transport box 74 and is positioned at as described above position of readiness.
After, similarly, by the material request signal from above-mentioned moulding pusher side material sensors 19b, repeat above-mentioned metering, carry the execution of moving.
As mentioned above, by making the material discharge portion 7 of using present embodiment, carry out the mode from the discharging operation of the powder and granular material of above-mentioned hopper main body 20, can not destroy the decompression state of hopper main body 20 that has been formed the decompression state of regulation by vavuum pump 3.Thus, in hopper main body 20, as described later, can more effectively improve the heat drying efficiency that is heated the dry powder and granular material of processing.In addition, be accompanied by discharging operation, the powder and granular material in hopper main body 20 can not be exposed in extraneous air etc.
In addition, at above-mentioned moulding pusher side air blast, be controlled as in the metering in input, supply action and the material discharge portion 7 of carrying out with different timings in material throw-in part 6, the situation of conveying action etc., also can make air suction tube 18 carry and be connected with the air suction tube 14 of air blast 13 with being connected in material via transfer valve etc., material conveying is also used as to the material conveying air blast to resin molding machine 19 with air blast 13.
In addition, as not destroying the decompression state in (vacuum breaking) hopper main body 20, can eject the material discharge portion 7 from the material of hopper main body 20, be not limited to these parts of legend, also can adopt other materials discharge portion.Or, also can replace such mode, and adopt following material discharge portion: the bottom in hopper main body 20 arranges hold-up vessel etc. via opening and closing valve, when switching valve is open, destroys the decompression state in hopper main body 20.
Or, also can replace above-mentioned each mode, such as in the situation that the input port place of the processing machine of resin molding machine 19 grades directly or the mode of this hopper main body 20 is set via temporary transient storage hopper etc., adopt and the same material discharge portion forming of material throw-in part 6.Even by such mode, also become the decompression state that can not destroy in (vacuum breaking) hopper main body 20, and can eject the structure from the material of hopper main body 20.
Heated air supply unit 4 possesses helical form gas-heated portion 40 and gas supply part 50, and this gas supply part 50 is to these helical form gas-heated portion 40 supply gas, and has flow adjustment part.
Helical form gas-heated portion 40 as shown in Figures 1 and 2, possesses: helical form gas piping 41, is set to helical form in the periphery of hopper main body 20 in the mode along circumferential coiling, as gas ventilation road; And wire heater 42(is with reference to Fig. 2 (b)), there is the linear heating element being inserted in this helical form gas piping 41.This helical form gas-heated portion 40 as mentioned above, in the present embodiment, forms hopper periphery insulation portion, 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 as 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 for detection of the temperature of the gas of the outlet side of this helical form gas-heated portion 40, be imported into the temperature of the gas of hopper main body 20.
Helical form gas piping 41 in the present embodiment, as shown in Figure 1, take near the position upper end of circumferential lateral surface of hopper main body 20 is cardinal extremity, circumferential lateral surface setting along hopper main body 20, spread all over that it is upper and lower roughly whole and set, its end is connected with near the above-mentioned connecting portion at position, bottom of being located at the circumferential lateral surface of hopper main body 20.That is, in the present embodiment, helical form gas piping 41 spread all over hopper main body 20 the top that forms drum periphery and form periphery roughly whole and set of the bottom of inverted cone shape.In addition,, in legend, helical form gas piping 41 is wound as and adjacent pipeline is compared to each other approach or butt.
This helical form gas piping 41 is such as being that 4mm～30mm left and right, length of pipe are that the copper pipe of 1m～10m left and right etc. is bent into helical form and forms by internal diameter.The internal diameter of such helical form gas piping 41 and length of pipe are set according to the flow of heated air in importing hopper main body 20 or the gabarit shape of hopper main body 20 etc.
In addition, the base end part of this helical form gas piping 41 is connected with the gas supply pipe 56 of gas supply part 50 described later via joint between three members etc.
Wire heater 42 is such as inserting linear heating element from being located at the connector of joint between three members etc. of the above-mentioned base end part of helical form gas piping 41, and the portion of terminal by this wire heater 42 arranges this connector sealing.
The linear heating element of this wire heater 42 forms the line with heating functions such as nichrome wire with insulating materials coating, the length direction along this helical form gas piping 41 in helical form gas piping 41 configures.
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 and to arrive the position that at least surpasses 2/3 left and right 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 mm left and right.In addition, the length of the linear heating element of wire heater 42 is made as the length that is less than helical form gas piping 41, also can be based on setting according to the caloric value of the target heating-up temperature of the settings such as the kind of powder and granular material or initial stage moisture rate and this linear heating element self etc.
The heater that comprises these wire heaters 42 and helical form gas piping 41 (gas-heated mechanism) can be also, in above-mentioned copper pipe interpolation, enters after the linear heating element of wire heater 42, makes as described above copper pipe be bent into helical form and form.
The mensuration temperature signal (detected temperatures) of the wire heater 42 of this helical form gas-heated portion 40 based on gas temperature sensor 43, by being located at the CPU80 of control panel 8, carry out the control of the energising of ON/OFF control or PID control etc., so that be supplied to the temperature of the heated air in hopper main body 20, become predefined set point of temperature.Afore mentioned rules temperature can be based on setting according to the capacity of the target heating-up temperature of the settings such as the kind of powder and granular material or initial stage moisture rate, hopper main body 20 or the discharge rate of once discharging to next treatment process (the temporary transient storage hopper 19a arranging on resin molding machine 19 or this resin molding machine 19, other processing machines etc. (not shown)) etc., but can be also for example 80 ℃～160 ℃ left and right.
Like this, by having inserted the helical form gas piping 41 of wire heater 42, form the heater that the gas to being supplied in hopper main body 20 heats, thereby can effectively to the gas by helical form gas piping 41, be heated by wire heater 42.; by the gas in helical form gas piping 41, effectively contact with the linear heating element of wire heater 42; with such as being built-in with sheath heater or plate heater, comparing with the heaters such as heating cabinet of the heaters such as heater of heat release fin; these heat exchanges can be carried out more efficiently, efficiently by this gas-heated.Like this, can improve the efficiency of heating surface of gas, thus with such as heaters such as above-mentioned heating cabinets, compare, electric capacity can be made littlely, can realize economize on electricityization, and can make this heater self miniaturization.In addition,, as present embodiment, along the circumferential lateral surface of hopper main body 20 and arrange, can reduce thus heat loss etc., and can heat the periphery of hopper main body 20.
In addition as mentioned above, adopt by 42 pairs of structures that heat by the gas in helical form gas piping 41 of wire heater, so can improve response comparatively.That is, for the heating target to by helical form gas piping 41, be that the heater that gas heats is linear heating element, so the thermal capacity of heater self is less, the intensification of heater self or cooling are rapider.Result, can be accompanied by the increase and decrease of flow of the gas by helical form gas piping 41, the change of the gas temperature of the outlet side (hopper side) that the change of external air temperature, other interference cause, make to control owing to switching on to wire heater 42 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 causing locates and more promptly chase after from set point of temperature.That is, difficult overregulating or less stress joint etc., can control the temperature that imports the gas of the heating in hopper main body 20 for more stable temperature.
; at the heater that adopts heating box in the past; and carry out in the situation of control of the flow increase and decrease make to be supplied to the heated air in hopper main body; especially when heating compared with the gas of low discharge; the integral body of the heaters such as sheath heater in being directed into gas in case and being disposed at case contacts unevenly; do not carry out heat exchange with integral body, can expect contacting and advancing along short circuit paths with a part for this heater, thereby be exported.As a result, sometimes at this heater, produce the overheated of part, can expect this heater damage.In addition, producing under the state of such hot-spot, if flow is increased, the temperature of outlet side sharply rises to set point of temperature above (overregulating) sometimes, can expect stable temperature control ratio more difficult (otherwise also can expect that same phenomenon occurs).And then, in the heater of such heating box, when deriving to the pipeline of deriving side in case, also can expect that the pressure loss becomes large.
On the other hand, the helical form gas-heated portion 40 possessing according to the decompression type drying device 1 that has adopted the present embodiment of said structure, can prevent the problems referred to above.
And then, in the present embodiment, in the periphery of hopper main body 20, be provided as the helical form gas-heated portion 40 of the heating arrangements of hopper periphery insulation portion, employing is configured in the cardinal extremity of this helical form gas-heated portion 40 upper periphery of hopper main body 20, and its end is configured in to the structure of the periphery bottom of hopper main body 20.Therefore, be sent to the wire heater 42 that the gas of helical form gas piping 41 is located in this pipe from upper side to lower side at leisure in the periphery of hopper main body 20 and be warming up to set point of temperature.Result, with for example by the cardinal extremity of helical form gas-heated portion and end up and down on the contrary the situation of configuration compare, the powder and granular material that can be by the heat conduction from internal perisporium by the powder and granular material of the especially lower layer side in hopper main body 20, needs fully to carry out heat treated heats effectively.
In addition, as the heater that the gas being supplied in hopper main body 20 is heated, be not limited to helical form gas-heated as described above portion 40, also can adopt other heaters.For example, also can adopt the heater of sheath heater or plate heater etc. is provided in the gas-heated portion of case shape, by this heater in this case shape gas-heated portion by the heating cabinet of the structure of gas-heated.
Or, also can adopt the following heater with heat release fin: using 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 flow paths along gas by direction.In addition, also can adopt above-mentioned heater in addition.
Gas supply part 50 has: supply gas Qie Ti mechanism, and switch from the gas of gas source 5,5A and supply with; Flow adjustment part, adjusts the flow that passes through the gas of pipeline by gas.
Above-mentioned gas source in the present embodiment, possesses: compressed air source 5, supply with compressed air; And import source 5A, via filter 52b, the extraneous air to atmosphere opening is imported.
Compressed air source 5 can be for example, by air vessel of being accumulated via aftercooler, drain separator etc. by the air of the compressor compresses such as compressor etc.Such compressed air source 5 can arrange the compressed air source 5 of this decompression type drying device 1 special use, but in being provided with the factory etc. of pneumatic element, compressed air source 5 as described above arranges usually used as shop equipment, so also can utilize this equipment.
In addition, also can be provided for supplying with or blocking the open and close valves 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, at this dry air, import on pipeline 51, distolateral towards another from compressed air source 5, be equipped with successively modified unit 51b, drier 51c, the 4th magnetic valve 51a, the 4th magnetic valve 51a is as for supplying with or block the open and close valve of the dry air importing via compressed air source 5.
As modified unit 51b, also can possess for adjust compressed air (compressed gas) pressure adjuster or for catching the filter of dust etc., for catching micro-mist separator (oil mist filter) of vaporific wet goods etc.
Drier 51c is used for making above-mentioned compressed gas suitably dry, can be the drier such as the simple types such as drier of macaroni yarn membrane type.The dew point that has passed through the compressed gas of this drier 51c can be made as is for example the lower dew point of-10 ℃～-40 ℃ of left and right.
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 for supplying with or block the open and close valve of the extraneous air importing 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.
At this, import on the other end of lateral line 53, via joint between three members philosophy, be connected with many (being in the present embodiment 2) branch lines 54,55(the first branch line 54, the second branch line 55) an end.
On the first branch line 54, be equipped with needle valve 54a, this needle valve 54a is as for adjusting the flow control valve of flow, on the second branch line 55, be equipped with the 5th magnetic valve 55a, the 5th magnetic valve 55a is as for supplying with or block by the open and close valve of the gas of this second branch line 55.
Each branch line 54,55 the other end separately, via joint between three members etc., is connected with an end of heating part lateral line 56, 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-heated portion 40.
In having adopted the gas supply part 50 of said structure, if the 4th magnetic valve 51a is opened, the 6th magnetic valve 52a is closed, can import pipeline 51 to importing the compressed gas (dry air) of lateral line 53 importings from compressed air source 5 via dry air.On the other hand, if the 4th magnetic valve 51a is closed, the 6th magnetic valve 52a is opened, can to importing lateral line 53, import from the extraneous air that imports source 5A via filter 52b and outside air intake duct road 52.That is, by optionally these the 4th magnetic valve 51a and the 6th magnetic valve 52a being carried out to 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, become the structure of the importing that stops gas.
Like this, by adopting, can optionally switch dry air and extraneous air, and the mode of supplying with to helical form gas-heated portion 40, can be to the mode of hopper main body 20 interior importings, thereby such as in the situation that the humidity of the extraneous airs such as summer is higher, can import pipeline 51 via dry air and import dry air, in the situation that the humidity of extraneous air such as grade is lower in the winter time, can import extraneous airs via outside air intake duct road 52.In addition, also can adopt following control mode: during such as startup at this decompression type drying device 1 etc., stage of start of run, the powder and granular material that emphasis makes to be stored in hopper main body 20 heats up, import the extraneous air of heating, after being warmed up to a certain degree, emphasis makes powder and granular material dry, imports the dry air of heating.
In addition, in the present embodiment, example by the 4th magnetic valve 51a and the 6th magnetic valve 52a are carried out to open and close controlling, can optionally switch above-mentioned dry air or extraneous air and import the mode in above-mentioned hopper main body 20, but the structure importing to hopper main body 20 so long as can optionally switch dry air or extraneous air, also can adopt other structures.
Or, also can replace such mode, and adopt the mode of the one party that can import dry air or extraneous air.That is, also can only possess dry air and import the one party in pipeline 51 and outside air intake duct road 52.
In the present embodiment, in the action of this decompression type drying device 1, adjustment is equipped on the needle valve 54a of the first branch line 54, with often time by the gas of regulation flow, and carry out open and close controlling to being equipped on the 5th magnetic valve 55a of the second branch line 55, thereby can increase and decrease the flow of the gas of importing.
If the 5th magnetic valve 55a is closed, stipulate that the gas of flow can be via the first branch line 54 from gas source 5(5A) to 56 circulations of heating part lateral line.On the other hand, if the 5th magnetic valve 55a is opened, in the gas of the afore mentioned rules flow by the first branch line 54, added that the gas of the flow of the second branch line 55 can be from gas source 5(5A) to 56 circulations of heating part lateral line.In addition, below using make the 5th magnetic valve 55a be gas under the state of closing, by the first branch line 54 as small-flow gas, using making the 5th magnetic valve 55a, be that gas under the state of opening, by branch line 54,55 illustrates as large flow gas.
Like this, by employing, a plurality of branch lines 54,55 are set, therein at least one arranges open and close valve 55a and makes the mode of flow increase and decrease, can form flow adjustment part by easy structure.
In addition, the first branch line 54 is configured to when normal and can passes through the gas of regulation flow, so can make the gas of this regulation flow import continuously in hopper main body 20.Thus, as described later, drive vavuum pump 3 and by the interior decompression of hopper main body 20, import the gas of heating simultaneously, thereby, can be discharged to swimmingly outside hopper main body 20 by the attraction of vavuum pump 3 at the surperficial emersion of powder and granular material and be evaporated to moisture in hopper main body 20 etc. with the displacement of this heated air simultaneously.
In addition thus, also can prevent for by the damage of the wire heater 42Deng gas-heated mechanism of the gas-heated importing etc..
And then, by adopting as described above the mode that a plurality of branch lines make the flow increase and decrease of gas that arranges, although structure is simpler and easy, but according to the increase and decrease amplitude of the flow of expectation and increase and decrease stage etc., set the diameter valve of the number of these branch lines and the diameter of each pipeline, open and close valve etc. etc., thereby also can make the flow of the gas of importing fine increase and decrease.
In addition, in an example of elemental motion described later, exemplified with by making the 5th magnetic valve 55a intermittently open, make to be directed into the mode that the flow of gas of the heating of hopper main body 20 intermittently increases, but be not limited to such mode.For example, can be also following mode: in the situation that the flow of the gas of importing is increased, make the 5th magnetic valve 55a open continuously, in the situation that the flow of the gas of importing is reduced, the 5th magnetic valve 55a is closed.
In addition, in the present embodiment, exemplified with conduct, for adjusting the flow adjustment part of the flow of the gas of supplying with to helical form gas-heated portion 40, a plurality of branch lines 54,55 are set, the mode that open and close valve 55a is set in therein at least one and flow is increased and decreased, but so long as can make the structure of the flow increase and decrease of gas, can be any structure.For example also can adopt following mode: make the switching timing of the 5th magnetic valve 55a when increasing and while reducing different, or the throughput when opening is different, so that the flow of per stipulated time increase and decrease, by higher speed carry out open and close controlling, make the flow increase and decrease of the gas that imports.In this case, also above-mentioned a plurality of branch line can be set, and in the pipeline that gas passed through from above-mentioned gas source, open and close valve be set.
Or, also can replace arranging the mode of above-mentioned a plurality of branch lines, or except above-mentioned a plurality of difference pipeline is set, the flow rate regulating valves such as motor valve that can carry out aperture control are also set in the pipeline that the gas from above-mentioned gas source passed through.Also can, by controlled the aperture of such flow rate regulating valve by CPU80, make the flow increase and decrease of the gas of importing.
In addition, as above-mentioned gas, being not limited to extraneous air or extraneous air is carried out to modified and dry dry air, can be also gas or other non-active gas such as nitrogen, argon gas.
Control panel 8 possesses: CPU80, and program is according to the rules controlled above-mentioned each machine and each portion of this decompression type drying device 1; And guidance panel and storage part, via holding wire etc., be connected respectively with this CPU80.On this CPU80, via holding wire etc., be connected with above-mentioned each machine, various sensor.
Guidance panel is configured for setting or input various setting operations and described laterly sets cuit etc. in advance or show various imposing a condition and the display operation portion of various operation modes etc.
Storage part consists of various memories etc., preserves imposing a condition of being set, inputted by the operation of guidance panel or input value, for carrying out the various programs, the various tables of data of predefined exercises conditioned disjunction etc. of the control program etc. of the exercises such as elemental motion described later or above-mentioned input action and discharging operation.
One example of the elemental motion of carrying out in the decompression type drying device 1 of the present embodiment of above-mentioned formation then, is described.
The < material initial stage is dropped into operation >
In when the startup of this decompression type drying device 1 etc., in the situation that do not have the state (dummy status) of powder and granular material in hopper main body 20, carry out the material initial stage and drop into operation.
The first slide-valve 61 of material throw-in part 6 and the second slide-valve 65 is open, the above-mentioned peristome of the outlet of trap 60 and the lid 20c on hopper main body 20 tops is communicated with.In addition, drive material to carry with air blast 13, the powder and granular material being stored in 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 hopper main body 20.If hopper material sensors 24 detects full material level, each slide-valve 61,65 cuts out, and material conveying is stopped with air blast 13.
In addition, the in the situation that of having powder and granular material in hopper main body 20, do not need to carry out this material initial stage input operation.
In addition, also in the time of can dropping into operation at such material initial stage of execution, hopper material sensors 24 detects full material level, and after the second slide-valve 65 cuts out, after material drops into the interior powder and granular material of storing ormal weight of storage tube 63, the first slide-valve 61 cuts out, material is carried and with air blast 13, stopped.
The < initial stage operation > that turns round
As described above after the interior powder and granular material of storing ormal weight of hopper main body 20, execution initial stage running operation.This initial stage running operation is following operation: make the powder and granular material being stored in hopper main body 20 be warming up to specified degree, and carry out to the heat drying that has at least fully carried out the powder and granular material corresponding with the discharge rate that is positioned at lower layer part and process (becoming temperature, the moisture rate (moisture content) of regulation), do not carry out powder and granular material and move and from the above-mentioned discharging operation of hopper main body 20 to the above-mentioned input of hopper main body 20.
Vavuum pump 3 and wire heater 42 are started, and the 4th magnetic valve 51a of heated air supply unit 4 and the 5th magnetic valve 55a is open.
That is, the driving by vavuum pump 3 is the interior decompression of hopper main body 20, and the gas by 4 heating of heated air supply unit is imported in hopper main body 20.
At this moment, the helical form gas-heated portion 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 by 20 heating of hopper main body.In addition, be heated to as described above the heated air of set point of temperature via internal perisporium opening 21 and porous plate 22, be supplied in hopper main body 20.That is,, by the heat conduction of the internal perisporium from hopper main body 20 and the heated air of supplying with from bottom, by the powder and granular material heating being stored in hopper main body 20, and be dried processing by the depressurization of vavuum pump 3.
By importing above-mentioned heated air, the temperature of the gas by material layer, be that material layer uses the detected temperatures of sensor 25 slowly to rise from the low temperature of room temperature (extraneous air temperature) degree by temperature detection.If this material layer surpasses the threshold value of predefined regulation by the temperature of gas, make the 5th magnetic valve 55a of heated air supply unit 4 close, the flow of the gas of importing is reduced.
Like this, in the present embodiment, the governing factor of the regulation of the heat drying treatment state of the powder and granular material using the temperature of gas of having passed through above-mentioned material layer within representing hopper main body 20, infers the heat drying treatment state of powder and granular material according to this temperature.
The threshold value of afore mentioned rules is based on according to the capacity of the target heating-up temperature of the settings such as the kind of powder and granular material or initial stage moisture rate, hopper main body 20 or the discharge rate of once discharging to next treatment process etc., experimentally or empirically setting, for example, can be made as 40 ℃～120 ℃ left and right.
In this initial stage running operation, before surpassing 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 large flow gas (heated air of maximum quantity of wind) is imported in hopper main body 20.The powder and granular material that thus, can make to be stored in hopper main body 20 heats up rapidly.
In addition, if surpass above-mentioned threshold value, 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 importing.That is, above-mentioned small-flow gas is imported in hopper main body 20.Thus, the vacuum in the hopper main body 20 that the attraction by vavuum pump 3 forms improves, and the heat effect that the importing by depressurization and small-flow gas causes, effectively carries out the heat drying of powder and granular material and process.
In other words, in this initial stage running operation, in its starting stage, carry out so that the control that powder and granular material heats up and attaches most importance to, in the in the end stage, is carried out the control that at least improves the aridity of the powder and granular material corresponding with the discharge rate of lower layer part.
In addition, the time of carrying out above-mentioned initial stage running operation is 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., experimentally or empirically set.Or, also can be in the following way: the temperature sensor that the temperature that detects the orlop portion that is stored in the material layer in hopper main body 20 is set, mensuration temperature signal (detected temperatures) based on this temperature sensor, the material of differentiating the orlop portion in hopper main body 20 whether carries out heat drying processing until the state of regulation, and reports the end of initial stage running operation.
In addition, also can adopt following mode: while surpassing above-mentioned threshold value, start the counting of the time movements such as timer of CPU80, carry out this initial stage running operation until passed through the stipulated time.
In addition, all amounts that the intensification of the powder and granular material carrying out in this running operation does not need to make to be stored in the powder and granular material in hopper main body 20 at initial stage are warming up to uniform temperature, and the temperature that the foot that makes to be stored in the powder and granular material in hopper main body 20 plays the powder and granular material of about 4 one-tenth～7 one-tenth is warming up to the temperature of regulation.In other words, also can be, the heated air importing by the bottom from hopper main body 20, in hopper main body 20, the mode with the thermograde that slowly raises to lower layer part formation temperature from upper layer part, makes each layer of intensification, at least before starting continuous operation operation described later, when this continuous operation operation, carry out at any time this running operation at initial stage, until fully carried out the heat drying of the powder and granular material of the ormal weight of discharging from orlop, process.
< continuous operation operation >
Execution initial stage running operation, prepares if carry out running as described above, transfers to continuous operation operation.
In this continuous operation operation, by receiving from the material request signal (pass signal) of moulding pusher side material sensors 19b of temporary transient storage hopper 19a that is arranged at the top of resin molding machine 19, carry out above-mentioned discharging operation, and, by receiving the material request signal (pass signal) from hopper material sensors 24, carry out above-mentioned input action.
By this, drop into action, for example, at the new powder and granular material of the interior input room temperature of hopper main body 20 degree, the temperature of having passed through the gas of above-mentioned material layer sharply declines, and is down to below above-mentioned threshold value.Like this, during 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 importing.
For example, can be in the following way: make the 5th magnetic valve 55a intermittently open, to increase the throughput of the gas of per stipulated time, alternately import above-mentioned large flow gas and small-flow gas.The recruitment of this heated air can be the amount corresponding with the intensification energy of the powder and granular material of above-mentioned such new input.Thus, can further realize energy-saving.
By making as described above the flow of the heated air of importing increase, the intensification of the powder and granular material of above-mentioned new input is carried out rapidly, has passed through the temperature climbed of the gas of above-mentioned material layer.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 importing.That is, same during with above-mentioned initial stage running operation, the 5th magnetic valve 55a is closed, above-mentioned small-flow gas is directed in hopper main body 20.Thus, with above-mentioned same, the vacuum in hopper main body 20 improves, and the heat effect that the importing by depressurization and small-flow gas brings, effectively carries out the heat drying of powder and granular material and process.
Below, similarly, drive vavuum pump 3 and by the interior decompression of 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, if so that the temperature of gas of having passed through material layer, lower than above-mentioned threshold value, increases the flow of the gas importing, if passed through the temperature of the gas of material layer, surpass above-mentioned threshold value, reduce the flow of the gas importing.
As mentioned above, according to the decompression type drying device 1 of present embodiment, can improve the heat drying efficiency of the powder and granular material being stored in hopper main body 20, and realize energy-saving, the while can prevent deteriorated (oxidation, burn, decomposition, the variable color etc.) of the overheated powder and granular material causing etc.
In addition, as mentioned above, can control the temperature that is directed into the gas in hopper main body 20 on one side, to become predefined set point of temperature, import on one side the gas of heating, the powder and granular material being stored in hopper main body 20 is carried out to heat treated, so compare with the method for the heat treated of being undertaken by heat conduction fin in the past, can significantly shorten start-up time, and can significantly improve cleaning in hopper main body 20 and powder and granular material can storage capacity.
In addition, the increase and decrease that is directed into the flow of the heated air in hopper main body 20 is not limited to the mode of this elemental motion example, can adopt above-mentioned variety of way.Or, also can adopt the mode of supplying with the heated air of ormal weight when normal, replace this elemental motion example such, the material layer based on as above-mentioned controlling element increase and decrease the mode of control by the temperature of gas to the flow of heated air.
Or, also can be except control mode as described above, or replace control mode as described above, when carrying out above-mentioned initial stage running operation, after the just startup of this decompression type drying device 1, do not start vavuum pump 3, or starting under the state of vavuum pump 3, by CPU80, control heated air supply unit 4, with to the interior supply heated air of hopper main body 20.At this moment, hopper main body 20 is interior can be more than atmospheric pressure, or can be also decompression state.In addition, at this moment, also can be to the heated air of the above-mentioned large flow of the interior supply of hopper main body 20.If adopt in such a way, can make to be stored in the state that powder and granular material in hopper main body 20 is warming up to rapidly afore mentioned rules.
On the other hand, also can be, the heat treated of the powder and granular material in hopper main body 20 after proceeding to specified degree (for example, when the temperature of having passed through the gas of above-mentioned material layer surpasses above-mentioned threshold value, or while having passed through the stipulated time afterwards, or while having passed through the predefined duration of runs at initial stage), by CPU80, heated air supply unit 4 is controlled, under reduced pressure heated air is supplied in hopper main body 20.At this moment, also can be to the heated air of the above-mentioned low discharge of the interior supply of hopper main body 20.
In addition, also can be, when normal by CPU80, monitor the discharging operation of material discharge portion 7, and carry out following control: when the time of not discharging surpasses the predefined stipulated time, the supply of heated air is stopped, on the other hand, while then carrying out discharging operation, the supply of heated air is started again.Thus, can realize energy-saving.
In addition, as mentioned above, also can replace the mode that dry air is heated and imported, and the mode that employing is heated extraneous air import, or also can adopt at start of run, extraneous air is heated and import, the mode that then dry air is heated and imported.
And then, in above-mentioned elemental motion example, before the operation that turns round in the early stage, carry out the above-mentioned material initial stage and drop into operation, until become the mode of 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 the action same with above-mentioned initial stage running operation, Yi Bian repeat above-mentioned input action, powder and granular material is slowly stored in hopper main body 20 on one side, until become full material level from dummy status.Thus, from dummy status till full material level, drop into action during also can import heated air while reducing pressure and carry out heat drying processing, and when carrying out above-mentioned input action, do not carry out the vacuum breaking in hopper main body 20, so can effectively carry out the heat drying of powder and granular material, process yet.
In addition, in the present embodiment, in order to improve the heat drying efficiency of the powder and granular material that is stored in hopper main body 20, adopted the bottom that the internal perisporium opening 21 of the gas introduction port as heated air is arranged on to hopper main body 20, the gas discharge outlet 23 being connected with vavuum pump 3 is arranged on to the mode on the top of hopper main body 20, so that making the heated air being supplied in hopper main body 20 by heated air supply unit 4 passes 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.Or, the porous plate of blanketing gas introducing port (internal perisporium opening) also can be set, and be arranged on material discharge pipe, there is the connecting portion that gas imports, this connecting portion is connected with the end of helical form gas piping 41.
And then, in the present embodiment, for improve hopper main body 20 inside cleaning and can storage capacity, the internal perisporium of hopper main body 20 is made as to roughly level and smooth face, but for example for the heat treated of the powder and granular material of auxiliary heating gas supply part 4, or in order to strengthen hopper main body 20 etc., also spaced walls or rib, heat conduction fin etc. can be set in the inside of hopper main body 20.
Then, with reference to the accompanying drawings of other embodiments of the decompression type drying device of powder and granular material of the present invention.
Fig. 3 and Fig. 4 are for the key diagram of the decompression type drying device of the second embodiment is described.
In addition, the difference of main explanation and above-mentioned the first embodiment, give same mark, and the description thereof will be omitted or schematic illustration for same structure.
The decompression type drying device 1A of the powder and granular material of present embodiment and the main distinction of above-mentioned the first embodiment are, the hopper periphery insulation portion of the 2A of hopper portion and the structure of heated air supply unit 4A.
In the present embodiment, hopper periphery insulation portion adopts following structure: the periphery at hopper main body 20A arranges periphery heater 27, to cover the mode of this periphery heater 27, arranges and above-mentioned same insulation 26.In addition, in the present embodiment, the hopper periphery of temperature of peripheral part that is provided for detecting hopper main body 20A sensor 28 for temperature detection.
; in the above-described first embodiment; show the example using the helical form gas-heated portion of heated air supply unit as the heating arrangements performance function of hopper periphery insulation portion, but in the present embodiment, adopt the structure of the periphery heater that the special use of hopper periphery insulation portion is set.
Periphery heater 27 is set to cover the upper periphery of the hopper main body 20A that forms drum, and be set to cover the lower, outer perimeter of inverted cone shape, in the present embodiment, with a band heater, form upper side, with two band heaters, form lower side.As this periphery heater 27, so long as be set to cover the parts of the periphery of hopper main body 20A, can be also any heaters such as other planar heaters.
This periphery heater 27 is the mensuration temperature signal (detected temperatures) with sensor 28 based on hopper periphery temperature detection, by CPU80, carried out the energising of ON/OFF control or PID control etc. and control, so that the periphery of hopper main body 20A (forming the framework periphery wall of hopper main body 20A) becomes predefined set point of temperature.Afore mentioned rules temperature can be set according to the target heating-up temperature etc. of carrying out heat treated and be heated to the powder and granular material of set point of temperature, for example, can be made as 40 ℃～160 ℃ left and right.
Like this, in the present embodiment, different from above-mentioned the first embodiment, although adopted the heating arrangements of special-purpose hopper periphery insulation portion, but the detected temperatures based on hopper periphery temperature detection with sensor 28, carries out to the energising of periphery heater 27 and controls, and can realize energy-saving.; after device has just started; the framework self of hopper main body 20A and the temperature that is stored in powder and granular material are wherein room temperature left and right, so the detected temperatures based on temperature sensor 28 switch on, the current on time of the periphery heater 27 of control is in higher state.On the other hand, the supply of the heated air by heated air supply unit 4A, the temperature climbed of the powder and granular material layer in hopper main body 20A, the periphery temperature of hopper main body 20A also slowly rises, so can reduce the current on time of periphery heater 27, realize energy-saving.
In addition, the internal perisporium opening and the porous plate that replace explanation in the above-described first embodiment, the connecting portion of heated air supply unit is set in the bottom of material discharge pipe 20a, gas introduction port 21A(to hopper main body 20A inner opening is set on this connecting portion also with reference to Fig. 4 (a)).As shown in Figure 4 (a), on this connecting portion, be provided with material layer orlop portion sensor 29 for temperature detection.This material layer orlop portion temperature detection arranges in order to detect the temperature of the orlop portion that is heated the dry powder and granular material of processing in hopper main body 20A with sensor 29, can be following mode: the mensuration temperature signal (detected temperatures) based on this material layer orlop portion temperature detection with sensor 29, whether heat drying has been processed the state of stipulating to the material of the orlop portion in differentiation hopper main body 20A.In this case, can be also, if for example lower than set point of temperature, postpone discharge or transfer to next treatment process, execution makes the control increasing from the flow of the gas of the heating of heated air supply unit 4A importing described later, to reach set point of temperature.Or, also can replace above-mentioned material layer by temperature detection sensor 25, and using this material layer orlop portion temperature detection with sensor 29 as for detection of represent powder and granular material heat drying treatment state, as the testing agency of temperature of the controlling element of regulation, grasp.
In the present embodiment, heated air supply unit 4A, as shown in Figure 4, possess the helical form gas-heated 40A of portion and with above-mentioned same gas supply part 50.
The helical form gas-heated 40A of portion possesses: helical form gas piping 41A, and end is connected with above-mentioned connecting portion; Wire heater 42A, has the linear heating element setting along this helical form gas piping 41A.The structure of these helical form gas piping 41A and wire heater 42A as shown in Figure 4 (b), same with above-mentioned the first embodiment, adopt and in helical form gas piping 41A, along the length direction of this helical form gas piping 41A, set the structure of the linear heating element of wire heater 42A.In the present embodiment, be not they to be provided in to 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 detect the outlet side of this helical form gas-heated 40A of portion gas temperature, be directed into the gas temperature of hopper main body 20A, with above-mentioned same, detected temperatures based on this gas temperature sensor 43, is undertaken controlling to the energising of wire heater 42A by CPU80.
By such helical form gas-heated 40A of portion, also same with above-mentioned the first embodiment, can improve to the efficiency of heating surface of the gas of hopper main body 20A supply, realize economize on electricityization, and can make the temperature of this gas more promptly chase after from set point of temperature.
In the decompression type drying device 1A of present embodiment that adopts said structure, also carry out the exercises same with the decompression type drying device 1 of explanation in the above-described first embodiment, realize same effect.
In addition, in the present embodiment, exemplified with hopper periphery temperature detection is arranged on to the mode of the upper periphery of hopper main body 20A with sensor 28, but also can adopt following mode: for example, according to the number that arranges of periphery heater 27, set temperature sensor on each periphery heater 27, detected temperatures based on each temperature sensor, controls (multiple spot control) to each periphery heater.
In addition, also can divide along the above-below direction of hopper main body 20A and cede territory, at a plurality of positions, periphery heater 27 is set, at corresponding position set temperature sensor respectively, similarly carry out multiple spot control with above-mentioned.
And then, also can be, as illustrated in the above-described first embodiment, when normal by CPU80, monitor the discharging operation of material discharge portion 7 and carry out in the mode that the supply of heated air controls based on this discharging operation, when the time of discharging has surpassed the predefined stipulated time, stop the supply of heated air, after this stops, through while not discharging yet after the predefined stipulated time, stop the energising (power supply) to periphery heater 27 again.Thus, can further realize energy-saving.And, then when carrying out discharging operation, carry out and make the supply of heated air and the control again starting to the energising of periphery heater 27.
And then, in addition, in the present embodiment, show the example that is formed hopper periphery insulation portion by periphery heater 27 and insulation 26, this periphery heater 27 spreads all over circumferential lateral surface upper and lower roughly whole and arrange of hopper main body 20A, but also can be only in the lower, outer perimeter of hopper main body 20A, periphery heater 27 be set, or also can periphery heater 27 be set and only by insulation 26, be formed.
In addition, the insulation of the gabarit of the helical form gas piping 41A that covers the helical form gas-heated 40A of portion also can be set, prevent heat release.
Then, based on Fig. 5 explanation, be arranged at variation of heated air supply unit and a variation of gas introduction port of each decompression type drying device of the respective embodiments described above.
In addition, for giving same mark with the same structure of the respective embodiments described above, and the description thereof will be omitted or schematic illustration.
Fig. 5 (a) represents the heated air supply unit 4B of the first variation, this heated air supply unit 4B possesses: the 40B of gas-heated portion, be equipped on dry air and import pipeline 51, this dry air imports pipeline 51 and makes from passing through with the dry air of above-mentioned same compressed air source 5; And the anti-locking mechanism of bridge joint, be arranged at downstream (the gas introduction port 21(21A of the bottom of the hopper main body) side of the 40B of this gas-heated portion), make heated air moment importing hopper main body 20(20A) in, make hopper main body 20(20A) in boost rapidly, to hopper main body 20(20A) in powder and granular material layer apply impact, thereby prevent bridge joint.
The 40B of gas-heated portion is configured to the heater of heating box, the heater of this heating box is following structure: the heaters such as sheath heater or plate heater are provided in the gas-heated portion of case shape, pass through this heater by gas-heated in this case shape gas-heated portion.By this 40B of gas-heated portion, the temperature of heated gas is by detecting with above-mentioned same gas temperature sensor 43, by CPU80(with reference to Fig. 1 and Fig. 3) carry out controlling to the energising of the heater of the 40B of gas-heated portion.
The anti-locking mechanism of above-mentioned bridge joint possesses: three-way switch valve 57, is disposed at the downstream of the 40B of gas-heated portion; And as the gas tank 45 of gas reservoir, be connected with a connector of this three-way switch valve 57, store the 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 imports the gas introduction port 21(21A of pipeline 51 and the bottom of hopper main body) be connected.
This three-way switch valve 57 carries out switching controls by CPU80 program according to the rules, at the gas stored condition that compressed air source 5 and gas tank 45 is communicated with and make gas tank 45 and gas introduction port 21(21A) switch between the gas importing state of connection.
Gas tank 45 form the gases at high pressure that can heat storage, resistance to pressure and stable on heating container, in this gas tank 45, to cover the mode of its periphery, be provided with and above-mentioned same insulation 46.
In addition,, in the downstream of the 40B of gas-heated portion, at the upstream side of three-way switch valve 57, be provided with pressure-regulating valve 44.
As illustrated in the respective embodiments described above, be stored in hopper main body 20(20A) in powder and granular material according to discharging ormal weight as the request of supplying with resin molding machine 19 grades of target, but in the situation that not carrying out this discharging operation, be stored in hopper main body 20(20A) in powder and granular material in do not produce movement.Particularly, in the decompression type drying device 1 of the respective embodiments described above, 1A, maintain the decompression state of hopper main body on one side, carry out the supply of heated air on one side, can carry out effective heat drying processing thus, but phase negative side, such with aeration type drying device in the past device of supplying with the gas of Wind Volume when normal is compared, and the quantity delivered of heated air is few.As a result, in the situation that the long period is not carried out above-mentioned discharging operation, along with the carrying out that heat drying is processed, according to the kind of powder and granular material, consider that powder and granular material can adhere to each other, and as piece, condense (bridge joint).
Therefore, in this variation, as described below termly by gases at high pressure moment importing hopper main body 20(20A) in, thereby prevent bridge joint phenomenon.
First, three-way switch valve 57 is made as to above-mentioned gas stored condition, the gases at high pressure that are adjusted into predefined pressure by pressure-regulating valve 44 are stored in gas tank 45.
Then, when the discharging operation of material discharge portion 7 does not surpass the predefined stipulated time, three-way switch valve 57 is switched to above-mentioned gas and imports state, make gases at high pressure moment of heating import hopper main body 20(20A) in, make hopper main body 20(20A) in boost rapidly.
Above-mentioned discharging operation can be also for example by CPU80, to be monitored the on-off action of the material discharge valve (being slide valve 71 in above-mentioned example) of material discharge portion 7.And, can be also, when carrying out discharging operation, make the time movement action of CPU80 and count, setting out as during stopping to carrying out next row, if passed through the afore mentioned rules time, by the gases at high pressure moment importing hopper main body 20(20A of heating) in.
In addition, also can adopt following mode: for example, to before transferring to above-mentioned continuous operation operation, switching three-way transfer valve 57, make the 40B of gas-heated portion and gas introduction port 21(21A) be communicated with, make the heated air of regulation flow (for example above-mentioned large flow) import hopper main body 20(20A) in.
In addition, also can be, in above-mentioned continuous operation operation, before the temperature of having passed through above-mentioned material layer surpasses above-mentioned threshold value, import the heated air of afore mentioned rules flow, on the other hand, while surpassing above-mentioned threshold value, make the time movement action of CPU80 and count, if be not less than above-mentioned threshold value, passed through the afore mentioned rules time, three-way switch valve 57 is switched to above-mentioned gas stored condition, and in gas tank 45, store after the gases at high pressure of ormal weight, three-way switch valve 57 is switched to above-mentioned gas and import state, and by the gases at high pressure moment importing hopper main body 20(20A of heating) in.That is, also can replace the mode that monitors as described above discharging operation and carry out the importing control of gases at high pressure, or except aforesaid way, the importing of carrying out gases at high pressure by temperature based on material layer is controlled.
According to the decompression type drying device that possesses the heated air supply unit 4B that has adopted said structure, moment by above-mentioned gases at high pressure imports the hopper main body 20(20A causing) interior boosting rapidly, can be to being stored in hopper main body 20(20A) in powder and granular material layer apply impact, 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 hopper main body 20(20A) in powder and granular material layer by the gas of moment, imported and to lift and to float a little, each powder and granular material moves a little and changes thus, can make coagulated state destroy, or prevent from condensing in advance.
In addition, as above-mentioned, like that termly gases at high pressure moments is imported to hopper main body 20(20A) in timing controlled, be not limited to above-mentioned example, also can adopt following mode: setting can detect the change of the powder and granular material in 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 Gai testing agency, till this detection signal of next time output during, whenever surpassing the afore mentioned rules time, with the interval of this stipulated time termly by the control of CPU80, by gases at high pressure moment importing.
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 by 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 hopper main body, also can adopt other various testing agencies.
Or, also can replace the mode that monitors like this change of the powder and granular material in hopper main body by testing agency, and preset, gases at high pressure moments is imported to hopper main body 20(20A) in be spaced apart the stipulated time.That is, can be also, no matter whether have the change of the powder and granular material in hopper main body etc., all the interval with the predefined stipulated time regularly imports gases at high pressure.Thus, can prevent bridge joint phenomenon by simple control.
In addition, the afore mentioned rules time also can be according to kind of powder and granular material etc., experimentally or be empirically redefined for time of the degree that can prevent above-mentioned bridge joint phenomenon.Preferably can be set as, before becoming coagulated state, before producing bridge joint, carry out such time of importing of gases at high pressure.
In addition, the capacity of gas tank 45 be the gas that imports moment import volume, make gas tank 45 and hopper main body 20(20A) dry air that is communicated with import pipeline 51 internal diameter, moment the pressure of gas that imports, the degree of boosting in the hopper that the importing of gas causes, can be according to being stored in hopper main body 20(20A) in storage capacity, the kind of powder and granular material and the hopper main body 20(20A reducing pressure by vavuum pump 3) in vacuum etc., be set as making hopper main body 20(20A) in the degree that changes as described above of powder and granular material layer.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, can be also that the moment by above-mentioned gases at high pressure imports, hopper main body 20(20A) in pressure temporarily become atmospheric pressure more than, or also can maintain vacuum state.
In addition, can be also, at dry air, import the downstream of the 40B of gas-heated portion of pipeline 51, via transfer valve etc., connect branched pipe, using this branched pipe as bypass path, import pipeline 51 with the dry air in the downstream of gas tank 45 and be connected.Adopt in the situation of such structure, also can be, before transferring to above-mentioned continuous operation operation, above-mentioned transfer valve is switched to branched pipe side, thereby import the gas of regulation flow, on the other hand, after transferring to above-mentioned continuous operation operation, above-mentioned transfer valve is switched to gas tank 45 sides, similarly with prescribed manner moment, import gases at high pressure with above-mentioned.
And then, also can import at dry air downstream or above-mentioned bypass path setting and the above-mentioned same flow adjustment part of the gas tank 45 of pipeline 51, control with the above-mentioned increase and decrease of similarly carrying out flow.In this case, also can be, when the temperature of having passed through above-mentioned material layer surpasses above-mentioned threshold value, flow to be reduced, and the counting of timer is started, if be not less than above-mentioned threshold value, pass through the afore mentioned rules time, imported gases at high pressure, on the other hand, passing through afore mentioned rules before the time, the temperature of having passed through above-mentioned material layer during lower than above-mentioned threshold value, increases flow, and carries out and make timer such control of resetting.
Fig. 5 (b) represents the heated air supply unit 4C of the second variation, and this heated air supply unit 4C is also same with above-mentioned the first variation, possesses the anti-locking mechanism of bridge joint.In addition, for structure and the action same with above-mentioned the first variation, the description thereof will be omitted or schematic illustration.
The structure of the gas-heated portion of the heated air supply unit 4C of this variation is different from above-mentioned the first variation.
That is,, in this variation, the heater that the 40C of gas-heated portion of heated air supply unit 4C is replaced by heating box sets the heaters such as sheath heater or plate heater and forms the 40C of gas-heated portion in gas tank 45A.
In having adopted the heated air supply unit 4C of said structure, also can carry out the action same with above-mentioned the first variation, with above-mentioned same, can prevent bridge joint phenomenon.
In addition, in this variation, same with above-mentioned the first variation, show at dry air and import in pipeline 51 and set three-way switch valve 57, on an one connector, connected the example of gas tank 45A, but also three-way switch valve 57 can be set, introducing port and the export mouth of gas has been 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, by this open and close valve is carried out to open and close controlling, can switch and carry out gases at high pressure to the storage of gas tank 45A and gases at high pressure to hopper main body 20(20A) moment import, the heated air of regulation flow is to hopper main body 20(20A) supply.
Fig. 5 (c) represents the heated air supply unit 4D of the 3rd variation, and this heated air supply unit 4D is also same with above-mentioned the first variation and the second variation, possesses the anti-locking mechanism of bridge joint.In addition, for structure and the action same with above-mentioned the first variation, the description thereof will be omitted or schematic illustration.
The structure of the gas-heated portion of the heated air supply unit 4D of this variation is different from above-mentioned the first variation.
That is, in this variation, using the 40D of gas-heated portion of heated air supply unit 4D as the spiral helicine gas-heated 40D of portion.That is, this helical form gas-heated 40D of portion, sets helical form gas piping 41 along the periphery of gas tank 45B, sets and omitted illustrated and above-mentioned same linear heating element in this helical form gas piping 41.
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; In the downstream of this export mouth, be provided with open and close valve 57A.
In addition, the periphery at the helical form gas-heated 40D of portion 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 the action same with above-mentioned the first variation, with above-mentioned same, can prevent bridge joint phenomenon.That is,, by open and close valve 57A is carried out to open and close controlling, can switch and carry out gases at high pressure to the storage of gas tank 45B and gases at high pressure to hopper main body 20(20A) moment import, the heated air of regulation flow is to hopper main body 20(20A) supply.
In addition, in this variation, adopted the helical form gas-heated 40D of portion has been wound on to the structure in the periphery of gas tank 45B, but also can adopt, the helical form gas-heated 40D of portion has been arranged on the gas of gas tank 45B by the mode of the approaching position of direction upstream side.That is, can replace the gas-heated portion of the heated air supply unit of above-mentioned the first variation, and adopt the mode that the helical form gas-heated portion illustrating is in the above-described 2nd embodiment set.
In addition, in above-mentioned the first variation to the three variation, replace the heated air supply unit 4, the 4A that illustrated in the respective embodiments described above, and employing arranges respectively the mode of each heated air supply unit 4B, 4C, 4D, but except the heated air supply unit 4 that illustrated in the respective embodiments described above, 4A, these each heated air supply units 4B, 4C, 4D also can be set respectively.In this case, can be at the upstream side of each gas introduction port, be connected respectively side by side each heated air supply unit 4B, 4C, 4D with each heated air supply unit 4,4A, or the gas introduction port that each heated air supply unit 4B, 4C, 4D use 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 by gases at high pressure moment importings in the above described manner as the anti-locking mechanism of bridge joint.
Or, also can replace the heated air supply unit 4 illustrating in the respective embodiments described above, the dry air of 4A to import pipeline 51, and adopt the heated air supply unit 4B of above-mentioned the first variation to the three variation, the mode of 4C, 4D of arranging.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, from to hopper main body 20(20A) viewpoint of the stability of the temperature of the heated air supplied with, be preferably the upstream side at gas tank as above-mentioned each variation gas-heated portion is set, but pressure-regulating valve 44 and three-way switch valve 57 that the dry air that also can adopt the heated air supply unit 4 that illustrated, 4A in the respective embodiments described above for example illustrated in importing and being arranged on above-mentioned the first variation in pipeline 51, be connected to the mode on this three-way switch valve 57 by gas tank 45.In this case, the length of pipe of helical form gas piping can be made as to 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 in order to reduce the pressure loss of gases at high pressure the curvature of canal path or pipeline etc.
Fig. 5 (d) is illustrated in a variation that is applicable to the gas introduction port of employing in the decompression type drying device that possesses heated air supply unit 4B, 4C, 4D illustrating in above-mentioned the first variation to the three variation.
In this variation, in the bottom of hopper main body 20B, arrange with dry air and import the gas importing connecting portion 58 that pipeline 51 is connected, at this gas, import on connecting portion 58 gas introduction port 21B is set.
This gas imports connecting portion 58 and interior side, has the space of the material discharge pipe 20d that accommodates the bottom of being located at hopper main body 20B, between the periphery and lower end periphery of material discharge pipe 20d, formation can make the gap of heated air circulation, to surround the mode of material discharge pipe 20d, arrange, these gaps are as gas introduction port 21B performance function.That is, as the gas introduction part of accommodating the material discharge pipe 20d of short tube shape and the structure of the double pipe structure that employing consists of this material discharge pipe 20d and gas importing connecting portion 58.
In having adopted the gas introduction part of said structure, the heated air (gases at high pressure) of supplying with via dry air importing pipeline 51 via material discharge pipe 20d around, imports in hopper main body 20B from the lower end of material discharge pipe 20d.That is, can import heated air from the all-round interior side towards material discharge pipe 20d of the lower end periphery of material discharge pipe 20d.
Thus, compare with each gas introduction port illustrating in the respective embodiments described above, can reduce the pressure loss that is directed into the heated air of hopper main body from heated air supply unit, and for the powder and granular material layer in hopper main body, do not become local importing, can prevent the bias current of this gas etc.
In addition, also can replace each gas introduction port of illustrating in the respective embodiments described above, and the gas introduction part that possesses this gas introduction port 21B is set.Replace the gas introduction port 21 illustrating in the first embodiment and under situation about applying, porous plate etc. is not set, and it is upper that the end of helical form gas piping is connected to above-mentioned gas introduction port 21B.
Or, as described above, except the heated air supply unit illustrating in the respective embodiments described above, also arrange in the situation of heated air supply unit of the first variation to the three variation, except each gas introduction port illustrating in the respective embodiments described above, also the gas introduction part that possesses this gas introduction port 21B can be also set.
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 the respective embodiments described above, give same mark, and the description thereof will be omitted or schematic illustration for same structure.
Fig. 6 (a) represents the decompression type drying device 1B of the 3rd embodiment, and this decompression type drying device 1B is mainly that the hopper periphery insulation portion of the 2B of hopper portion and the structure of heated air supply unit 4E are different from the respective embodiments described above.
Heated air supply unit 4E possesses: with the above-mentioned same helical form gas-heated 40E of portion, in the periphery of the bottom that forms inverted cone shape of hopper main body 20 along circumferential setting; And with above-mentioned same gas supply part 50.This helical form gas-heated 40E of portion is different from above-mentioned the first embodiment, and take near the upper end of lower, outer perimeter is cardinal extremity, is connected with and above-mentioned same gas supply part 50 on this cardinal extremity.
In addition in the upper periphery that forms drum of hopper main body 20, be provided with and above-mentioned same periphery heater 27.
; in the present embodiment; the helical form gas-heated 40E of portion 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 present embodiment that has adopted said structure, also carry out the exercises same with the respective embodiments described above, realize same effect.
In addition, can periphery heater 27 be set in the upper periphery of hopper main body 20 yet, and adopt the mode that insulation 26 is only set in upper periphery.Thus, can be by the helical form gas-heated 40E of portion to the lower, outer perimeter of hopper main body 20, the periphery apart from the nearlyer side of material discharge portion is incubated, heats.
In addition, also can be configured to, the top that forms drum of hopper main body 20 and the bottom that forms inverted cone shape form respectively, and these upper and lowers, by links such as hinges, and are opened and closed freely fastening by securing member etc.In this case, also can adopt following structure: while making upper side open, the helical form gas-heated 40E of portion that is located at bottom can be taken off from hopper main body 20 together with the internal perisporium of bottom.Thus, can improve the maintainability of the helical form gas-heated 40E of portion.
And then, in legend, show the roughly whole example setting along this lower, outer perimeter that the helical form gas-heated 40E of portion is spreaded all over to the lower, outer perimeter of hopper main body 20, but also can only in the part setting of lower, outer perimeter, for example, can only at lower side position, arrange.
In addition, as shown in double dot dash line, heated air supply unit 4B, 4C, 4D(that above-mentioned the first variation to the three variation also can be set in addition in the 4th following embodiment to the six embodiments too).In this case, also the gas introduction part that possesses above-mentioned gas introducing port 21B can be arranged on to the bottom of hopper main body.
Or, as described above, also can adopt mode that these heated air supply units 4B, 4C, 4D and heated air supply unit 4E are arranged side by side or in combination (in the 4th following embodiment to the six embodiments too).
Fig. 6 (b) represents the decompression type drying device 1C of the 4th embodiment, and this decompression type drying device 1C is mainly that the structure of heated air supply unit 4F of the 2C of hopper portion is different from the respective embodiments described above.
Heated air supply unit 4F possesses: the helical form gas-heated 40F of portion, along the upper and lower roughly whole installation of the periphery of hopper main body 20C; And gas ventilation pipe 47, in hopper main body 20C along setting up and down.
The helical form gas piping 41 of the helical form gas-heated 40F of portion is different from above-mentioned the first embodiment, and take near the bottom of hopper main body 20C is cardinal extremity, is connected with and above-mentioned same gas supply part 50 on this cardinal extremity.In addition, from this cardinal extremity, towards upper side, be wrapped in the periphery of hopper main body 20C with helical form, its end is connected with the connecting portion of gas ventilation pipe 47 of being located at the upper periphery of 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, in the interior side space of hopper main body 20C along setting up and down.
In the bottom of this gas ventilation pipe 47, (transport the terminal part from the gas ventilation road of the gas of helical form gas piping 41) and be provided with a plurality of gas discharge outlet 47a, the plurality of gas discharge outlet 47a is distributed to heated air in hopper main body 20C and discharges.In addition, this bottom forms bamboo hat shape or cone shape, and this bottom is also as bringing into play function with the above-mentioned same FIFO umbrella as rectification part.
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 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.
Or, as shown in legend, also can replace arranging in the periphery of hopper main body 20C the mode of helical form gas-heated portion, and the helical form gas-heated 4A of portion illustrating is in the above-described 2nd embodiment set, its end is connected with gas ventilation pipe 47.
In the decompression type drying device 1C of present embodiment that adopts said structure, also carry out the exercises same with the respective embodiments described above, realize same effect.
In addition, according to present embodiment, by the powder and granular material being stored in hopper main body 20C, the direct heating of the heated air that discharge the bottom by from gas ventilation pipe 47 and from the indirect of the heat transfer of the periphery of gas ventilation pipe 47 and the periphery (internal perisporium) of hopper main body 20C, can more effectively carry out heat drying processing.
In addition, also can adopt the whole of the upper periphery side of hopper main body 20C or only a part structure of the helical form gas-heated 40F of portion is set, in the whole or part of periphery that the position of the helical form gas-heated 40F of portion is not set, arrange and above-mentioned same periphery heater, or also can adopt the structure that insulation is only set at the position that the helical form gas-heated 40F of portion is not set.
Fig. 7 (a) represents the decompression type drying device 1D of the 5th embodiment, and this decompression type drying device 1D is mainly that the hopper periphery insulation portion of the 2D of hopper portion and the structure of heated air supply unit 4G are different from the respective embodiments described above.
Heated air supply unit 4G possesses: with above-mentioned same gas supply part 50; And that be connected with this gas supply part 50, with above-mentioned the 4th embodiment same gas ventilation pipe 47A roughly.This gas ventilation pipe 47A is different from above-mentioned the 4th embodiment, sets the heaters such as sheath heater or tubular heater and form the 40G of gas-heated portion in its pipe.
In addition, in the present embodiment, adopt periphery at hopper main body 20C heating arrangements not to be set and the structure of insulation 26 is only set.
In the decompression type drying device 1D of present embodiment that has adopted said structure, also carry out the exercises same with the respective embodiments described above, realize same effect.
In addition, also can spread all over the lower, outer perimeter of hopper main body 20C or the upper and lower whole installation of circumferential lateral surface and above-mentioned same heating arrangements.
Fig. 7 (b) represents the decompression type drying device 1E of the 6th embodiment, and this decompression type drying device 1E is mainly that the structure of the 2E of hopper portion is different from above-mentioned the second embodiment.
The hopper main body 20D of the 2E of hopper portion compares with the hopper main body of the respective embodiments described above, forms up and down strip, in the interior side space of this hopper main body 20D, disposes block 48.
Block 48, such as being formed by metal materials such as the good stainless steel of exothermicity or aluminium, forms the hollow cylinder shape of upper and lower strip.Many the cantilevers that this block 48 extends to center of circle direction by the internal perisporium from hopper main body 20D, are configured in hopper main body 20D to suspend shape in midair, spread all over all-round setting and roughly omit impartial gap and configure between its circumferential lateral surface and the inner peripheral surface of hopper main body 20D.
In addition, in the upper end of this block 48, conus portion 48a is set, this conus portion 48a is distributed in hopper main body 20D the powder and granular material dropping 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 hopper main body 20D the heated air of supplying with from the bottom of hopper main body 20D equably.
In the decompression type drying device 1E of present embodiment that has adopted said structure, also carry out the exercises same with the respective embodiments described above, realize same effect.
In addition, due to block 48, hopper main body 20D can reduce than the respective embodiments described above by storage capacity, but heat drying efficiency can improve than device in the past., block 48 is as distance member performance function, can be by the powder and granular material in the impartial space being stored between the periphery of this block 48 and the internal perisporium of hopper main body 20D, direct heating by the heated air supplied with from bottom and from the heat transfer of the periphery (internal perisporium) of periphery heater 27, promptly heating.
In addition, also the same block of the block with illustrating in the present embodiment 48 can be arranged in the interior side space of each hopper main body illustrating in above-mentioned the first embodiment and the 3rd embodiment.
In addition, in above-mentioned the first embodiment, the 3rd embodiment and the 4th embodiment, show the example that forms the helical form gas-heated portion of the periphery of being located at hopper main body by forming the helical form gas piping of the tubulose of cross section toroidal, but be not limited to this structure.For example, can be also following mode: the peripheral part of hopper main body is made to two double wall structures, and arrange the partition wall of the spatial division of this two double wall with helical form, thereby form spiral helicine gas ventilation road.
In addition, in the respective embodiments described above, as the testing agency of controlling element of regulation for detection of representing the heat drying treatment state of the powder and granular material in hopper main body, exemplified with test material layer by the temperature sensor of the temperature of the orlop portion of temperature or powder and granular material, and exemplified with the detected temperatures based on this temperature sensor, the mode controlled being supplied to the increase and decrease of flow of the heated air in hopper main body and lead-in mode of heated air etc., but be not limited to such mode.
For example, as detection, passed through the testing agency of temperature of the gas of material layer, also can adopt so that the temperature sensor that test section sets in the face of the mode in vacuum attraction pipeline 11.Or, also detection can be stored in to the material layer upper layer part temperature detection of temperature in the layer of upper layer part of the powder and granular material in hopper main body and arrange as above-mentioned testing agency with sensor, or the material layer middle level portion temperature detection of the interior temperature of layer that also detection can be stored in to the middle level portion of the powder and granular material in hopper main body arranges as above-mentioned testing agency with sensor.
And then, as described above, also can replace the controlling element of the regulation of the heat drying treatment state of the powder and granular material in expression hopper main body is made as to temperature, and be provided for detecting the mode of the temperature sensor of this temperature, and adopt, controlling element is made as to humidity (dew point), and mode that the humidity for detection of this humidity (dew point) (dew point) sensor is arranged as above-mentioned testing agency.Like this, controlling element is made as in the situation of humidity (dew point), it is the rising of detected value that humidity (dew point) is transferred to compared with the situation grasp of downside from upper side, by humidity (dew point), from transfer to the situation grasp of upper side compared with downside, is the decline of detected value.
And then, as the controlling element of regulation that represents the heat drying treatment state of the powder and granular material in hopper main body, be not limited to temperature and humidity as described above (dew point), also can be, such as by hopper main body or the vacuum of vacuum attraction pipeline etc. be made as controlling element, the pressure gauge for detection of this vacuum is arranged as above-mentioned testing agency.Also can adopt following mode: Yi Bian such vacuum reduces pressure in as described above by hopper main body, while carrying out heat drying processing on one side, vacuum in hopper main body slowly approaches the vacuum of regulation, but the moisture containing in the powder and granular material in hopper main body etc. is slowly gasification by above-mentioned reduced pressure treatment, by this gasification, can not reach sharp the vacuum of regulation, so the vacuum of such regulation is set as threshold value, when the vacuum detecting at above-mentioned pressure gauge reaches the vacuum of regulation, the heat drying treatment state that is estimated as powder and granular material has reached the state of expectation, the flow of the gas of importing is reduced.In such mode, also can set a plurality of threshold values corresponding with the flow of the gas importing.
And then, in addition, as long as do not hinder these functions, just can be by the suitably distortion such as each structure illustrating in the respective embodiments described above and each variation and action case, combination.
In addition, in the respective embodiments described above, show according to the request of the supply targets such as resin molding machine, discharge the example of mode of the ormal weight of the powder and granular material in hopper main body, but also can apply decompression type drying device of the present invention in adopting the mode of once discharging its all amounts.
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-heated portion (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)
57A open and close valve
80CPU(control part)
Claims (9)
1. a decompression type drying device for powder and granular material, possesses: hopper, storage powder and granular material; And the mechanism of decompressor, by 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 described hopper;
Heated air supply unit is supplied with the gas of heating in described hopper; And
Control part, controls described heated air supply unit, makes its supply be heated to be the gas of predefined set point of temperature;
Described heated air supply unit possesses:
Gas reservoir, stores the gas from compressed air source;
Open and close valve, is arranged at the pipeline that this gas reservoir and described hopper are communicated with; And
Gas introduction port, the gas that has made to pass through this pipeline is directed into the bottom in described hopper;
Described control part makes described open and close valve open, and gas moment of described gas reservoir is imported in described hopper, makes to boost rapidly in this hopper.
2. the decompression type drying device of powder and granular material as claimed in claim 1, is characterized in that,
Described hopper periphery insulation portion possesses:
Heating arrangements, is arranged at the periphery of described hopper; And
Insulation, is arranged at the periphery of this heating arrangements.
3. the decompression type drying device of powder and granular material as claimed in claim 1, is characterized in that,
Described heated air supply unit possesses:
Gas ventilation road, forms helical form; And
Wire heater configures along this gas ventilation road in this gas ventilation road.
4. the decompression type drying device of powder and granular material as claimed in claim 2, is characterized in that,
Described heated air supply unit possesses:
Gas ventilation road, forms helical form; And
Wire heater configures 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 3, is characterized in that,
Described gas ventilation road in the periphery of described hopper along circumferentially with helical form setting.
6. the decompression type drying device of powder and granular material as claimed in claim 4, is characterized in that,
Described gas ventilation road in the periphery of described hopper along circumferentially with helical form setting.
7. the decompression type drying device of the powder and granular material as described in any one in claim 3～6, is characterized in that,
The end on described gas ventilation road, in the internal perisporium upper shed of the mortar shape of hopper bottom, arranges porous plate in the mode along this internal perisporium on this internal perisporium, and this porous plate covers this opening, and makes from the gas dispersion of this opening discharge.
8. the decompression type drying device of the powder and granular material as described in any one in claim 1～6, is characterized in that,
Described heated air supply unit possesses:
Gas ventilation pipe, the substantial middle in described hopper is along setting up and down; And
Gas discharge outlet, is arranged at the bottom of this gas ventilation pipe.
9. the decompression type drying device of powder and granular material as claimed in claim 7, is characterized in that,
Described heated air supply unit possesses:
Gas ventilation pipe, the substantial middle in described hopper is along setting 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 CN102762346A (en) | 2012-10-31 |
| CN102762346B true CN102762346B (en) | 2014-11-12 |
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| 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) |
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| KR101543959B1 (en) | 2014-04-10 | 2015-08-12 | 주식회사 포스코 | Hopper and lock hopper system having same |
| 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 |
| 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 |
| JP6644483B2 (en) * | 2015-06-12 | 2020-02-12 | 株式会社カワタ | Heating device and method of controlling heating device |
| KR102271743B1 (en) * | 2015-12-31 | 2021-06-30 | 김희선 | Hopper Heater |
| KR101805857B1 (en) * | 2015-12-31 | 2017-12-07 | 김희선 | Hopper Heater |
| JP6866931B2 (en) * | 2017-10-31 | 2021-04-28 | 株式会社Ihi | 3D modeling device and 3D modeling method |
| TWI687630B (en) * | 2019-04-16 | 2020-03-11 | 亞台富士精機股份有限公司 | Drying system and control method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2011102420A1 (en) | 2011-08-25 |
| JP2011167993A (en) | 2011-09-01 |
| CN102762346A (en) | 2012-10-31 |
| JP5461223B2 (en) | 2014-04-02 |
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