JP4927497B2 - Moisture-free hopper equipment - Google Patents

Description

  The present invention relates to a hopper device for moisture-free drying of a molding material, and more particularly to a hopper device for moisture-free drying suitable for moisture-free drying before molding processing of a molding material made of a synthetic resin powder. .

  For example, if a desired molded product is molded with a mold using a molding material made of a hygroscopic synthetic resin material, appearance defects and physical property deterioration are caused. Therefore, a process of drying the molding material before the molding process is essential. .

  The molding material drying process before the molding process is generally performed by a hot air dryer (hopper dryer), a drying hopper for a dehumidifying dryer, or a hopper that receives a molding material dried by a dehumidifying dryer at a material supply port of an injection molding machine. Is done.

  Among these, in the case of a drying hopper for a dehumidifying dryer, the drying of the molding material is performed by receiving a supply of dry heating air having a dew point of −40 ° C. from a separately arranged dehumidifying dryer, When the distance between the drying hoppers for the dehumidifying dryer is long, the temperature of the drying and heating air decreases due to heat dissipation, and it becomes difficult to accurately dry the molding material.

  In Patent Document 1, an umbrella-shaped raw material dispersion plate 21 having a ventilation part at least on the outer periphery is disposed in the chute 18 of the raw material hopper 17, and the raw material is dispersed to some extent by the central non-venting part 21a, and then the ventilation part 21b. Has been proposed to improve the drying efficiency by bringing it into contact with the dry air D, and to discharge the dry air through the exhaust duct 24 provided above the raw material dispersion plate 21. .

Also in the case of the drying apparatus of Patent Document 1, as in the case described above, if the piping distance of the dry air supply duct 23 is long, the temperature of the dry air decreases due to heat dissipation, and the molding material can be accurately dried. It becomes difficult.
JP 2002-160218 A

  The problem to be solved by the present invention is that there is no drying means that can efficiently dry the molding material before the molding process in a short time while maintaining the temperature of the dry air (dry air) appropriately. It is.

  The moisture-free drying hopper device of the molding material according to the present invention includes a hollow main body having a material charging port for molding material at the upper end, and a material dropping space for dropping the molding material from the material charging port downward. A screw blade enclosure comprising: a screw shaft body in which a net-like shaft portion facing the upper end side in the material drop space portion and a round rod-like shaft portion are vertically connected; and a screw blade attached to the screw shaft body Rotating the rotating screw body surrounded by the material, the molding material and the dry air from the outside heated by the heating means provided in the main body while conveying the molding material falling from the material fall space portion downward. A screw hopper for drying that performs non-humidity drying of the molding material by making countercurrent contact in the screw blade enclosure, and a lower part of the screw hopper for drying are communicated and conveyed. A weight-measuring hopper portion for weighing the moisture-free and dried molding material and releasing the metered molding material downward, and disposed in the region of the material dropping space portion, and in the drying screw hopper portion A suction / discharge mechanism that communicates with the upper end of the mesh shaft and sucks air, moisture, powder, etc. accompanying the moisture-free drying of the molding material from the upper end side of the mesh shaft under the action of compressed air and discharges it outside the body. The main feature is to have a part.

  According to the first aspect of the present invention, the rotating screw body is rotated, while the molding material falling from the material dropping space is conveyed downward, the molding material and the dry air heated by the heating means provided in the main body, and Since the molding material is brought into countercurrent contact within the screw blade enclosure to perform moistureless drying, dry air is intensively countercurrently contacted with the molding material to efficiently dry the molding material in a short time. It is possible to provide a hopper device for moisture-free drying of a molding material that can be performed.

  In addition, it is equipped with a weight-measuring hopper that measures the weight of the moisture-free molding material at the bottom of the main body and releases the metered molding material downward. Can be accurately measured, and the processing capability of the apparatus itself can be reliably grasped. Furthermore, since the upper part of the main body is equipped with a suction and discharge mechanism that sucks air, moisture, powder, etc. accompanying the moisture-free drying of the molding material and discharges it to the outside, the purity of the molding material that has been subjected to the moisture-free drying treatment is increased, The quality of a molded product using this molding material can be improved.

  According to the second aspect of the invention, in addition to the same effect as the first aspect of the invention, the intermittent air supply unit is added to the suction / discharge mechanism unit, so that the net portion of the net-like shaft portion is provided. Clogging can be prevented by blowing air, thereby providing a moisture-free drying hopper device for a molding material capable of preventing a reduction in suction capability such as dry air containing moisture in this device. .

  According to a third aspect of the present invention, a cylindrical heater is used as a heating means for the drying screw hopper, and the weight weighing hopper is provided with a hopper bucket that opens and closes and a load cell that performs integrated weighing of the molding material. The suction / discharge mechanism part includes a compressed air supply pipe and exhaust pipe including a venturi mechanism, and intermittent air blown intermittently from the holes of the intermittent air supply pipe inserted into the mesh shaft part to the mesh part of the mesh shaft part. With the configuration in which the air supply unit is transferred, it is possible to provide a moisture-free drying hopper device for a molding material that has the same effect as that of the second aspect of the invention.

  The present invention provides a moisture-free drying hopper device for a molding material capable of efficiently performing the drying treatment of the molding material before the molding treatment in a short time while maintaining the temperature of the dry air (dry air) appropriately. The purpose is to provide a hollow body having a material inlet for molding material at the upper end, an umbrella-like dispersion and a material passage hole through which the molding material from the material inlet is dispersed and collected in the body and dropped downward. A screw shaft body in which a material drop space sectioned by a material derivative provided with a material shaft, a mesh shaft portion facing the upper end side in the material drop space portion, and a round bar shaft portion are vertically connected, and the screw shaft A rotary screw body having a screw blade attached to the body and driven to rotate, a screw blade envelope surrounding the rotary screw body, and an outer side of the screw blade envelope in the main body. A heating means for heating the dry air from the outside and a flow path for the dry air that guides the dry air from the outside to the lower end side of the screw blade envelope through the heating means, and falls from the material drop space section The molding material is conveyed downward by the rotation of the rotary screw body, and the molding material and the external dry air heated by the heating means are brought into countercurrent contact within the screw blade enclosure to dry the molding material without moisture. A drying screw hopper portion to be performed; a shutter mechanism portion for releasing or blocking the flow passage of the molding material disposed at a lower portion of the drying screw hopper portion; and accommodation of the molding material flowing down through the shutter mechanism portion and downward of the main body A hopper bucket that opens and closes to discharge, and a weighing means that performs cumulative weighing of the molding material accommodated in the hopper bucket, A weight weighing hopper having a venturi mechanism that is disposed in a state of penetrating the main body in the material dropping space portion and communicated with an upper end portion of the mesh shaft portion in the drying screw hopper portion; Compressed air supply pipe and exhaust pipe for sucking air, moisture, powder, etc. accompanying the moisture-free drying of the molding material from the upper end side of the mesh-like shaft part under the action of air and discharging it to the outside of the main body, and the mesh-like shaft part This is realized by a configuration including an intermittent air supply unit that intermittently blows air to the net part of the slab.

  Hereinafter, a hopper apparatus for moisture-free drying of a molding material according to an embodiment of the present invention will be described in detail with reference to FIG.

  A moisture-free drying hopper device 1 for a molding material M (for example, a molding material made of a synthetic resin material) according to this embodiment includes a hollow main body 2 formed into a generally cylindrical shape with a bottom, An upper lid 3 that closes the upper end portion and is provided with a material charging port 4 at the center, a material dropping space portion 5 that drops the molding material M from the material charging port 4 provided at the upper part in the main body 2, and a main body A weight-measuring hopper 7 for weighing the moisture-free and dry molding material M provided in the lower part of the tube 2 and discharging the measured molding material M downward, and a central part in the material drop space 5 The cylindrical net-like shaft portion 6b and the round rod-like shaft portion 6c are connected to each other in the vertical direction, and the upper end side of the screw shaft body 6a with the screw blades 13 is faced. Rotating screw that communicates the lower end of the body 6a A drying screw hopper 6 for rotating the molding material M in a moisture-free manner under the action of dry air while conveying the molding material M falling from the material dropping space 5 to the weight-measuring hopper 7. The material drop space portion 5 is arranged in a state of penetrating in the horizontal direction, and the central portion is communicated with the upper end portion of the cylindrical mesh shaft portion 6b in the screw hopper portion 6 for drying, and the mesh shaft portion 6b. A suction / discharge mechanism portion 8 that sucks air, moisture, powder, and the like associated with moisture-free drying of the molding material M from the upper end side and discharges them to the outside of the main body 2.

The material drop space 5 is disposed above the suction / discharge mechanism 8 and is formed in an umbrella shape, with its topmost part 11 a in the vicinity of the material charging port 4 and the outer peripheral edge 11 b in the body 2. Umbrella-shaped dispersion 11 protruding to the vicinity of the inner wall of the main body 2 and an inverted frustoconical shape formed on the lower side of the suction / discharge mechanism 8 and having the uppermost edge 12a having the maximum diameter on the inner wall of the main body 2 The material derivative 12 provided with a material passage hole 12c having a hole diameter through which the screw shaft body 6a passes with a gap is disposed at the center of the lower end portion 12b having the minimum diameter.
The umbrella-like dispersion 11 in the moisture-free drying hopper device 1 according to the present embodiment disperses the molding material M from the umbrella-like dispersion 11 and applies it to the material derivative 12 to obtain powder from the molding material M. Is separated and wound up. After the powder is released, it is sucked and discharged from the mesh shaft portion 6b.

  The screw hopper 6 for drying has a cylindrical reticulated shaft portion 6b on the upper side and a round rod-shaped shaft portion 6c on the lower side. The screw shaft body 6a can be rotated in a vertical arrangement by connecting them straight. And a screw blade 13 whose diameter gradually decreases toward the lower part spirally wound around the screw shaft 6a over a range from the middle of the mesh shaft 6b to the lower end of the round bar shaft 6c. A screw body 14 and an inverted truncated cone corresponding to the shape of the screw blade 13 fixedly arranged so as to surround the vicinity of the outer periphery of the screw blade 13 from the lower end of the rotary screw body 14 to the range where the screw blade 13 exists. The screw blade enclosure 15 having a shape, and the material passage fixedly disposed between the upper end of the screw blade enclosure 15 and the inner wall of the main body 2. From the inner hopper body 16 that guides the molding material M falling from the hole 12c to the inside of the upper end of the screw blade enclosure 15, and the heat insulating material attached to the inner wall of the main body 2 so as to surround the substantially entire outer periphery of the screw blade enclosure 15. And a cylindrical heat insulator 17.

The drying screw hopper portion 6 is further provided on a lower support 18 fixedly arranged inside the lower end of the heat insulator 17 and a cylindrical external part constituting a heating means arranged at intervals inside the heat insulator 17. Cylindrical internal heater that constitutes a heating means that hangs vertically from the vicinity of the upper end of the heater 19 and the screw blade enclosure 15 and that does not reach the lower end while being spaced apart from the external heater 19 20, a dry air introduction pipe 26 disposed through the thick portion of the main body 2 and the thick portion of the heat insulator 17 corresponding to the vicinity of the upper end portion of the screw blade envelope 15, and the screw blade envelope 15 And a dry air introduction hole 15a formed in the screw blade enclosure 15 at a position near the lower end of the screw blade.
Then, dry air (details will be described later) from the dry air introduction pipe 26 is heated from above the external heater 19 through the gap 21 between the external heater 19 and the internal heater 20, and further below the internal heater 20. To the screw blade enclosure 15 through the dry air introduction hole 15a, and the countercurrent contact between the molding material M conveyed downward by the screw blade 13 and the heated dry air rising in the screw blade enclosure 15 It is configured to make it.

  The dry air introduction pipe 26 is supplied with dehumidified air having a dew point of about −40 ° C. to −45 ° C. from a dehumidifying dryer 24 provided outside the main body 2.

  The dry air introduction pipe 26 detects a dew point of the dry air, and outputs a detection signal for driving the alarm device 25 using a buzzer or the like when the detected dew point is not appropriate, and An air volume sensor 23 for detecting the air volume of dry air and outputting a detection signal for driving the alarm device 25 when the detected air volume is not appropriate is attached.

The weight weighing hopper 7 includes a lower support 30 constituting the main body 2 having a flat bottom plate 30a, and the upper end of the lower support 30 is tapered from the lower end of the screw blade enclosure 15. A shutter mechanism portion 32 is provided for blocking or releasing the flow path of the molding material M falling through the communication pipe 31.
Further, in the lower support 30, a weight measuring hopper 40 for measuring the weight of the molding material M and an outer periphery excluding the upper surface side of the weight measuring hopper 40 are enclosed below the shutter mechanism portion 32. A discharge hopper 50 is provided which is formed in a taper shape having a smaller diameter toward the lower side, and a discharge port 50a provided at the center of the lower end passes through the bottom plate 30a and faces the lower end surface of the bottom plate 30a.

  The shutter mechanism 32 has, for example, electromagnetic actuators 33 and 33 mounted horizontally so as to face the upper inner wall 30b of the lower support 30 with the communication pipe 31 in between, and the communication by the actuators 33 and 33. By closing or opening the shutter pieces 34, 34 facing the lower end of the pipe 31 in the horizontal direction, the flow path of the molding material M from the communication pipe 31 to the weight weighing hopper 40 is closed or opened. It has become.

  The weight weighing hopper 40 has a pair of symmetrical shapes that are configured to be divided into, for example, two parts from the central portion in the vertical direction with respect to the annular body 35 attached to the lower support 30 below the shutter mechanism portion 32. The upper end portions of the cylindrical hopper buckets 36 and 36 are supported so as to be openable and closable. When the hopper buckets 36 and 36 are closed, a storage space for the molding material M is formed therein, and in the opened state, Is opened to allow the molding material M to flow down into the discharge hopper 50 and to be discharged from the discharge port 50a to the outside. The opening and closing directions of both hopper buckets 36, 36 are indicated by arrows in FIG.

  That is, the hopper buckets 36 and 36 have a substantially cylindrical shape with the upper part opened in the closed state, and have a tapered shape with the lower end closed at the lower end, so that the hopper buckets 36 and 36 face each other. The center part of the upper end part is supported by the annular body 35 so as to be opened and closed.

  The weight weighing hopper 40 is further arranged so as to displace the load cell 37, which is a weighing means for integrating and weighing the weight of the molding material M falling into the hopper buckets 36, 36, together with the hopper bucket 36.

  The suction / discharge mechanism 8 includes a compressed air supply pipe 51 and an exhaust pipe 52 for compressed air that are arranged in series and penetrate the material drop space 5 and project laterally from the outer wall of the main body 2. An inward end portion 51a fitted inside one end of the exhaust pipe 52 of the compressed air supply pipe 51 is formed in a tapered shape, and one end of the exhaust pipe 52 is tapered to constitute a venturi mechanism for sucking air or the like. A hole 52a is provided.

  Further, the region of the venturi mechanism communicates with the upper end portion of the cylindrical mesh shaft portion 6 b in the screw hopper portion 6 for drying via an upper communication pipe 53. The upper communication pipe 53 is disposed so as not to disturb the rotation of the mesh shaft 6b.

  The suction / discharge mechanism unit 8 further includes an intermittent air supply unit 60. That is, it penetrates the side wall of the main body 2 from the outside of the main body 2, bends at the connecting portion of the upper communication pipe 53 and the net-like shaft portion 6b, and reaches the round rod-like shaft portion 6c through the inside of the net-like shaft portion 6b. The intermittent air supply pipe 61 is arranged up to the range. The intermittent air supply pipe 61 in the mesh shaft portion 6b is provided with a large number of holes, and air is intermittently blown from these holes to the mesh portion of the mesh shaft portion 6b so that the mesh portion is not clogged. It is configured.

  The compressed air supply pipe 51 is supplied with compressed air from a compressed air supply source 54 (for example, an air compressor) provided outside the main body 2. Air is intermittently supplied to the intermittent air supply pipe 61 from an intermittent air supply source 62 (for example, an air compressor) provided outside the main body 2.

  Next, a control system of the hopper apparatus 1 for moisture-free drying of a molding material according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 2, the moisture-free drying hopper device 1 according to the present embodiment controls the entire device based on the program memory 71 storing the operation program of the moisture-free drying hopper device 1 and the operation program. And a control unit 70 connected to the control unit 70. The control unit 70 is connected to an operation unit 72 for starting and stopping the moisture-free drying hopper device 1 and a display unit 73 for displaying the measurement value of the load cell 37. .

Further, the controller 70 controls the dehumidifying dryer 24, the compressed air supply source 54, the intermittent air supply source 62, a screw drive source 73 using a motor or the like for rotationally driving the rotary screw body 14, the external heater 19 and the internal heater. 20 is configured to perform operation control of a heater heating source 74 composed of a power supply device that supplies required power to 20 and a hopper driving source 75 using a motor that drives the hopper buckets 36 and 36 to open and close.
Further, the control unit 70 controls the dew point sensor 22 and the air volume sensor 23 to sound the alarm device 25 based on these detection signals and to display the measurement value on the display unit 73 based on the measurement signal of the load cell 37. It is configured to perform control.

  Next, the operation of the hopper apparatus 1 for moisture-free drying of the molding material of this embodiment will be described. In the moisture-free drying hopper device 1 according to the present embodiment, the operation unit 72 is operated to be in an operating state, and the rotary screw body 14 is rotationally driven by the screw drive source 73.

  Further, dry air is introduced from the dehumidifying dryer 24 into the screw blade enclosure 15 through the dry air introduction pipe 26, the gap 21 between the external heater 19 and the internal heater 20, and the dry air introduction hole 15a. The dry air passing through the gap 21 is heated by the external heater 19 and the internal heater 20 that generate heat by the electric power from the heater heating source 74.

  In this state, the molding material M is charged into the material drop space 5 from the material charging port 4. The charged molding material M is once dispersed by the umbrella-shaped dispersion 11, and then collected in the center by the material derivative 12, and falls into the drying screw hopper 6 through the material passage hole 12c, and the drying material M The screw is transported downward by a rotating screw body 14 that is driven to rotate in the screw hopper 6.

At this time, the heated dry air introduced into the screw blade enclosure 15 is brought into concentrated contact with the molding material M transported downward, not in the diffused state, and thus the molding material M is efficiently short. Dehumidified on time.
Thereafter, the dehumidified molding material M reaches the shutter mechanism portion 32 from the lower end of the screw blade enclosure 15, and the shutter pieces 34 and 34 are opened at appropriate timing by the actuators 33 and 33 of the shutter mechanism portion 32. Thus, the dehumidified molding material M falls into the weight weighing hopper 40.

  At this time, the hopper buckets 36 and 36 are closed, and the weight (how many kilograms, etc.) of the molding material M is measured by the load cell 37. The measurement of the molding material M by the load cell 37 is performed so as to sequentially accumulate the respective measurement values of the molding material M repeated a required number of times, and the measurement value of the load cell 37 is visually displayed on the display unit 73, The total weight value weighed can be judged visually.

  Then, by opening the hopper buckets 36, 36 at an appropriate timing, the molding material M flows down into the discharge hopper 50, and is further discharged from the discharge port 50a to the lower outside of the main body 2. The

  On the other hand, the dry air in countercurrent contact with the molding material M in the screw blade enclosure 15 rises in the screw blade enclosure 15 while containing moisture accompanying dehumidification. Since the venturi mechanism formed by the compressed air supply pipe 51 and the exhaust pipe 52 communicates with the upper end of the mesh shaft 6b via the upper communication pipe 53, the dry air is sucked and discharged to the outside. It exhibits a discharge function, and dry air containing moisture and fine powder scattered from the molding material M are sucked into the cylindrical mesh shaft portion 6b, and further passes through the exhaust pipe 52 through the venturi mechanism region. Then, it is discharged to the side of the main body 2.

  Further, if necessary, the intermittent air supply unit 60 is operated, and air is intermittently blown from the intermittent air supply pipe 61 in the mesh shaft 6b to the mesh portion of the mesh shaft 6b to mesh the mesh shaft 6b. Prevent clogging of parts.

  In this way, the moisture-free drying operation for the molding material M by the moisture-free drying hopper device 1 of the present embodiment is performed once, and such an operation is repeated as many times as necessary.

  According to the moisture-free drying hopper device 1 of the present embodiment, the heated dry air that is introduced into the screw blade enclosure 15 in the drying screw hopper portion 6 and rises is supplied to the screw blades 13 of the rotary screw body 14. Therefore, the molding material M conveyed downward is concentratedly counter-contacted instead of being diffused, so that the molding material M can be efficiently dehumidified in a short time.

  That is, for example, even if dry air heated from the dehumidifying dryer 24 is introduced into the screw blade enclosure 15, the temperature decreases due to heat dissipation in the middle. However, according to the non-humidity drying hopper device 1 of the present embodiment. For example, since the drying screw hopper 6 is provided with the external heater 19 and the internal heater 20 for heating the dehumidified air, the temperature of the dry air at the time of dehumidifying and drying the molding material M can be appropriately maintained. The moisture-free drying can be efficiently performed in a short time, and the power consumption of the moisture-free drying hopper device 1 can be reduced.

  In addition, according to the moisture-free drying hopper device 1 of the present embodiment, the amount of the one-shot molding material M to be input (humidity-free drying treatment) in conjunction with the weighing of the molding machine by the load cell 37 provided in the weight weighing hopper 40. It is possible to accurately grasp the processing capacity of the moisture-free drying hopper device 1 by measuring the total amount. That is, the weighing cell of the molding material M by the molding machine can be grasped only by the value of the product weight × the number of shots to determine how many kilograms are actually used in the volume weighing, and the load cell by the moisture-free drying hopper device 1 according to this embodiment. The advantage of the weighing method using 37 is great.

  Furthermore, according to the hopper device 1 for moisture-free drying of the present embodiment, dry air containing moisture subjected to the moisture-free drying process by the suction / discharge mechanism 8 or fine powder scattered from the molding material M is reliably obtained. Therefore, the purity of the molding material M subjected to the moisture-free drying treatment can be increased, and the quality of the molded product using the molding material M can be improved.

  Further, the operation of the intermittent air supply unit 60 blows air from the intermittent air supply pipe 61 in the mesh shaft portion 6b to the mesh portion of the mesh shaft portion 6b to prevent clogging, so that the mesh portion in the mesh shaft portion 6b. Thus, it is possible to prevent a reduction in suction ability with respect to dry air containing water and fine powder scattered from the molding material M.

  The present invention is widely applicable to, for example, moisture-free drying of cereal flour, in addition to the above-described moisture-free drying of molding materials.

It is a schematic sectional drawing which shows the structure of the hopper apparatus for moisture-free drying of the molding material which concerns on the Example of this invention. It is a block diagram which shows the control system of the hopper apparatus for moisture-free drying of the molding material which concerns on a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Non-humidity drying hopper apparatus 2 Main body 3 Upper cover 4 Material input port 5 Material fall space part 6 Drying screw hopper part 6a Screw shaft body 6b Reticulated shaft part 6c Round bar-shaped shaft part 7 Weight weighing hopper part 8 Suction discharge mechanism part 11 Umbrella-shaped dispersion body 11a Topmost part 11b Outer peripheral edge part 12 Material derivative 12a Upper edge part 12b Lower end part 12c Material passage hole 13 Screw blade 14 Rotating screw body 15 Screw blade enclosure 15a Dry air introduction hole 16 Internal hopper body 17 Heat insulator 18 Lower support 19 External heater 20 Internal heater 21 Gap 22 Dew point sensor 23 Air flow sensor 24 Dehumidification dryer 25 Alarm device 26 Dry air introduction pipe 30 Lower support 30a Bottom plate 30b Upper inner wall part 31 Communication pipe 32 Shutter mechanism part 33 Actuator 34 Shutter Fragment 35 annular body 36 hopper bucket 37 load cell 40 weight weighing hopper 50 discharge hopper 50a discharge port 51 compressed air supply pipe 51a inner end 52 exhaust pipe 52a tapered hole 53 upper communication pipe 54 compressed air supply source 60 intermittent air supply Unit 61 Intermittent air supply pipe 62 Intermittent air supply source 70 Control unit 71 Program memory 72 Operation unit 73 Screw drive source 73 Display unit 74 Heater heating source 75 Hopper drive source M Molding material

Claims (3)

A hollow body having a material inlet for the molding material at the upper end,
A material dropping space for dropping the molding material from the material charging port downward;
A screw shaft body in which a net-like shaft portion facing the upper end side in the material drop space portion and a round rod-like shaft portion are vertically connected, and a screw blade attached to the screw shaft body, and a screw blade enclosure The enclosed rotating screw body is rotated to convey the molding material falling from the material dropping space portion downward, and the molding material and dry air from the outside heated by heating means provided in the main body. A screw hopper for drying, which performs counter-current contact in the screw blade enclosure to perform moisture-free drying of the molding material;
A weight-measuring hopper unit that communicates with the lower part of the drying screw hopper unit and measures the weight of the moisture-free and dried molding material that is conveyed, and discharges the metered molding material downward;
The molding material is disposed in the region of the material dropping space and communicated with the upper end of the mesh shaft portion in the drying screw hopper, so that the molding material can be removed from the upper end side of the mesh shaft portion under the action of compressed air. A suction / discharge mechanism that sucks air, moisture, powder, etc., accompanying wet drying, and discharges it to the outside of the main body;
A hopper device for moisture-free drying of a molding material, comprising: A hollow body having a material inlet for the molding material at the upper end,
A material dropping space section defined by an umbrella-like dispersion that disperses, collects and drops the molding material from the material inlet in the main body and a material derivative provided with a material passage hole;
Rotation that is rotationally driven by a screw shaft body in which a net-like shaft portion facing the upper end side in the material drop space portion and a round rod-like shaft portion are connected in an up-and-down arrangement, and screw blades attached to the screw shaft body Screw body, screw blade enclosure surrounding the rotary screw body, heating means for heating dry air from the outside disposed outside the screw blade enclosure in the main body, screw from outside via the heating means A flow path of dry air that leads to the lower end side of the blade enclosure, while the molding material falling from the material drop space is conveyed downward by the rotation of the rotary screw body, by the molding material and the heating means A screw hopper for drying that dries the molding material in a non-humid state by bringing the dry air from outside into contact with the inside of the screw blade enclosure. And parts,
A shutter mechanism portion for releasing or blocking the flow passage of the molding material disposed under the drying screw hopper portion, and a hopper that opens and closes to receive and release the molding material flowing down through the shutter mechanism portion. A weight weighing hopper having a bucket and a weighing means for integrating and weighing the molding material accommodated in the hopper bucket; and the drying screw hopper disposed in a state penetrating the main body in the region of the material dropping space Including a venturi mechanism that communicates with the upper end of the reticulated shaft portion, and under the action of compressed air from the outside, air, moisture, powder, etc. accompanying the moisture-free drying of the molding material from the upper end side of the reticulated shaft portion Compressed air supply pipe and exhaust pipe for suction and discharge to the outside of the main body, and intermittent air supply for intermittently blowing air to the mesh portion of the mesh shaft A suction / discharge mechanism including
A hopper device for moisture-free drying of a molding material, comprising: A hollow body having a material inlet for the molding material at the upper end,
A material dropping space section defined by an umbrella-like dispersion that disperses, collects and drops the molding material from the material inlet in the main body and a material derivative provided with a material passage hole;
Rotation that is rotationally driven by a screw shaft body in which a net-like shaft portion facing the upper end side in the material drop space portion and a round rod-like shaft portion are connected in an up-and-down arrangement, and screw blades attached to the screw shaft body Screw body, screw blade enclosure surrounding the rotating screw body, heater formed in a cylinder for heating dry air from the outside disposed outside the screw blade enclosure in the main body, and heater for supplying dry air from outside And a flow path of dry air that leads to the lower end side of the screw blade envelope, and the molding material and the above while conveying the molding material falling from the material drop space portion downward by the rotation of the rotary screw body Drying slurry that dries the molding material in a non-humidified manner by bringing the dry air heated by the heater into contact with the outside in the screw blade enclosure. And Liu hopper,
A shutter mechanism portion for releasing or blocking the flow passage of the molding material disposed under the drying screw hopper portion, and a hopper that opens and closes to receive and release the molding material flowing down through the shutter mechanism portion. A weight weighing hopper having a bucket and a load cell for integrating and weighing molding material accommodated in the hopper bucket; and the screw hopper for drying is disposed in a state of penetrating the main body in the region of the material dropping space Including a venturi mechanism that communicates with the upper end of the mesh shaft portion in the air, and sucking air, moisture, powder, etc. accompanying the moisture-free drying of the molding material from the upper end side of the mesh shaft portion under the action of compressed air from the outside Compressed air supply pipe and exhaust pipe to be discharged to the outside of the main body, and a mesh shaft from a hole in the intermittent air supply pipe inserted inside the mesh shaft portion. An intermittent air supply unit that intermittently blows air to the net part of the unit, and a suction / discharge mechanism unit,
A hopper device for moisture-free drying of a molding material, comprising:

Images