JP2013049559A - Powder supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder supply device capable of improving quantitative properties of a conveyed powder material by preventing pulsation in a zone where compression is performed.SOLUTION: This powder supply device comprises: a screw rotated and driven to convey a powder material in an axial direction; and a barrel having a first zone which has an internal space where the screw is disposed and into which the powder material is introduced and a second zone in which compression by the rotary drive of the screw is performed for the powder material conveyed from the first zone and the powder material is discharged from a discharge port. In the first zone, a notch is formed in a flight of the screw, and the conveyance of the powder material is performed so that, while the powder material introduced between the flights of the screw is conveyed toward the second zone by the rotation of the screw, a part of the powder material is returned between the flights at a conveyance direction upstream side through the notch.

Description

  The present invention relates to a powder supply device that conveys and supplies a powder raw material along the axial direction of a barrel by rotationally driving a screw disposed in the barrel.

  Conventionally, various types of powder supply devices of this type are known. For example, in the conventional powder supply apparatus, the screw material arranged in the barrel is driven to rotate, so that the powder raw material introduced into the barrel at the introduction portion reaches the barrel end portion along the barrel axis direction. It has the structure which is conveyed and supplied out of a barrel (for example, refer patent document 1). The downstream part of the introduction part in the barrel is a compression part. In this compression part, the flight interval of the screw is narrowed compared to the other parts, so that the process of compacting the powder raw material to be conveyed is performed. Done. Thus, the compaction in the compression unit makes the bulk density of the powder raw material between flights uniform, and the quantified powder raw material is discharged from the barrel end portion.

Japanese Patent No. 3386326

  In recent years, the objects of powder raw materials handled by such powder supply apparatuses have been diversified, and there are cases in which powder raw materials having a high aggregating action are handled depending on characteristics and particle diameters. On the other hand, in powder supply apparatuses, it is required to supply powder raw materials while ensuring quantitativeness and uniformity with respect to powder raw materials having various characteristics.

  In the powder supply apparatus of Patent Document 1, the powder raw material introduced in the introduction unit is arranged between the flights of the screw, and the powder raw material between the flights is conveyed toward the compression unit by the rotation of the screw. It will be. However, in the introduction part, the powder raw material is simply introduced and arranged between flights, so the bulk density of the powder raw material arranged between flights is often not uniform. Further, depending on the characteristics and particle size of the powder raw material, partial agglomeration may occur, and it may be difficult to make the bulk density uniform at the introduction portion.

  In a state where there is a large variation in bulk density between flights, if the powder raw material is conveyed to the compression unit and compression is performed, pulsation may occur in the compression unit. The pulsation generated in the compression section has a problem that the quantitative property of the powder raw material discharged from the barrel end portion to the outside of the barrel is inhibited.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, and by rotating and driving a screw disposed in the barrel, the powder is conveyed and supplied along the axial direction of the barrel. An object of the present invention is to provide a powder supply apparatus capable of suppressing the occurrence of pulsation in a zone where compression is performed and improving the quantitativeness of the powder raw material being conveyed.

  In order to achieve the above object, the present invention is configured as follows.

  According to the first aspect of the present invention, there is provided a powder supply device that conveys and supplies a powder raw material using a screw, and the screw that conveys the powder raw material in the axial direction by being driven to rotate, The screw is disposed in the space, the first raw material into which the powder raw material is introduced, and the powder raw material conveyed from the first zone is compressed by rotating the screw, and the powder raw material is discharged from the outlet. A barrel having a second zone to be discharged, in which the notch is formed in the flight of the screw in the first zone, and the powder raw material introduced between the flights of the screw is moved to the second zone by the rotation of the screw. Provided is a powder supply device in which powder raw material is transferred so that a part of the powder raw material is returned between flights on the upstream side in the conveying direction through a notch while being conveyed toward .

  According to the second aspect of the present invention, in the screw arranged in the first zone, the flight is arranged so as to extend a plurality of turns around the screw shaft. The powder supply apparatus according to the first aspect, in which one or more notches are formed per rotation.

  According to the third aspect of the present invention, in the screw disposed in the first zone, the notch is not formed in the flight located at the upstream end portion in the conveying direction of the powder raw material. A powder supply apparatus according to the second aspect is provided.

  According to the fourth aspect of the present invention, an opening for introducing the powder raw material into the first zone is formed in a part of the barrel in the first zone, and the barrel is formed with the opening. The powder supply apparatus according to any one of the first to third aspects, wherein a plurality of notches are formed in a flight of a screw to be arranged.

  Further, in the first zone, a notch is formed in the flight of the screw corresponding to the part surrounded by the barrel in the entire circumferential direction, and the flight arranged in this part is within one rotation. May be.

  Further, in the axial direction of the screw, the notch portions formed in adjacent flights may be formed so as to have different positions in the circumferential direction.

  Further, in the screw, a notch may be formed in the flight so as to extend from the outer edge of the flight to the peripheral surface of the screw shaft.

  According to the present invention, in the first zone of the barrel, a notch is formed in the flight of the screw, while the powder raw material introduced between the flights of the screw is conveyed toward the second zone by the rotation of the screw, Part of the powder raw material is returned between the flights on the upstream side in the conveying direction through the notch. As a result, it is possible to equalize the bulk density of the powder raw material disposed between flights in the first zone so as not to vary greatly, and to suppress the occurrence of pulsation in the second zone where compression is performed. it can. Therefore, in the powder supply apparatus, the quantitativeness of the powder raw material to be conveyed can be improved.

Sectional drawing of the powder supply apparatus concerning Embodiment 1 of this invention Side view of powder supply device of embodiment 1 Schematic configuration diagram of the powder supply apparatus according to Embodiment 1 AA line sectional view in the powder supply apparatus of FIG. External view of the first screw V1 arrow view of the flight in the first screw of FIG. V2 arrow view of the flight in the first screw of FIG. V3 arrow view of the flight in the first screw of FIG. V4 arrow view of the flight in the first screw of FIG. V5 arrow view of the flight in the first screw of FIG. Development view of first screw flight External view of the second screw Sectional drawing of the powder supply apparatus concerning Embodiment 2 of this invention Sectional drawing of the powder supply apparatus concerning Embodiment 3 of this invention. BB sectional drawing in the powder supply apparatus of FIG. CC sectional view in the powder supply apparatus of FIG. Front view of discharge blade Side view of discharge blade Sectional drawing of the powder supply apparatus concerning Embodiment 4 of this invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings.

(Embodiment 1)
The configuration of the powder supply apparatus according to the first embodiment of the present invention will be described with reference to the apparatus configuration diagrams shown in FIGS. 1 and 2. 1 is a cross-sectional view as seen from the front side of the powder supply apparatus, and FIG. 2 is a side view of the apparatus.

  As shown in FIGS. 1 and 2, the powder supply apparatus 1 includes a hopper 2, an agitator 3, an introduction casing 4, a screw 5, a barrel 6, and a discharge casing 7.

  In the powder supply apparatus 1 according to the first embodiment, for example, a powder or granular material having a particle size distribution of 0.1 μm to several tens of μm is handled as a powder raw material. Such powder raw materials are used in various technical fields such as fine ceramics, metal materials, polymer materials, batteries / electronic materials, composite materials, pharmaceutical materials, food materials, etc., such as electronics, energy, medicine, and food. Inorganic and organic fine powders are targeted. Moreover, the powder raw material may be a case in which a plurality of types of powder raw materials (powder materials) are mixed.

  The hopper 2 is a device that supplies powder raw material to an introduction casing 4 that is communicated in the lower portion of the drawing, with the powder raw material being introduced through an opening that opens upward in the drawing. The hopper 2 is releasably connected to the introduction casing 4. For example, the hopper 2 can be separated from the introduction casing 4 during maintenance such as cleaning.

  As described above, the introduction casing 4 is disposed below the hopper 2 and communicated with the first zone of the powder raw material in the barrel 6 so that the powder raw material can be introduced. Has a function as a storage container for the powder raw material for continuously introducing. The detailed configuration of the barrel 6 will be described later.

  The agitator 3 is an apparatus for stirring the powder raw material so that partial aggregation such as a bridge does not occur in the powder raw material introduced into the introduction casing 4. Specifically, the agitator 3 is disposed in the introduction casing 4 and is driven to rotate about a horizontal rotation axis so as to agitate the powder raw material. 4 and an agitator driving device 32 that drives the agitating member 31 to rotate. In addition, the lower surface of the stirring space 41 in the introduction casing 4 serves as a rotation locus of the stirring member 31 so that the powder raw material in the introduction casing 4 is efficiently stirred by the stirring member 31 that is rotationally driven. It is formed as a substantially circumferential surface along (see FIG. 2).

  In the introduction casing 4, a powder raw material introduction space having a substantially U-shaped cross section whose upper part communicates with the stirring space 41 is provided at a lower portion of the stirring space 41 in which the stirring member 31 of the agitator 3 is rotated. 61 is formed. In the first embodiment, a part that defines the introduction space 61 (hereinafter referred to as a barrel casing 62) is a part of the barrel 6. Further, a powder raw material transfer pipe 63 is connected to the end of the barrel casing 62 so as to communicate with the barrel casing 62. That is, in the first embodiment, the barrel 6 includes a barrel casing 62 that forms an introduction space 61 below the stirring space 41 of the introduction casing 4, and a cylindrical conveyance that extends in communication with the barrel casing 62. The tube 63 is constituted. In the first embodiment, a case where the barrel casing 62 is formed integrally with a part of the introduction casing 4 will be described as an example. However, instead of such a case, the introduction casing 4 And the barrel casing 62 may be formed as separate members.

  The barrel 6 is generally formed in a substantially cylindrical shape, and the barrel casing 62 is opened at the top so that the introduction space 61 and the stirring space 41 are communicated with each other. A screw 5 is disposed in the barrel 6. The screw 5 has a screw shaft and a flight formed on the peripheral surface of the screw shaft, and a desired clearance is secured to such an extent that the outer peripheral end of the flight does not contact the inner peripheral surface of the barrel 6. Thus, the screw 5 is rotationally driven in the barrel 6 (that is, the barrel casing 62 and the transport pipe 63).

  Specifically, the screw 5 includes a first screw 51 disposed in the barrel casing 62 and a second screw 54 coupled to the first screw 51 and disposed in the transport pipe 63. The first screw 51 has a screw shaft 52 and a flight 53 formed on the circumferential surface of the screw shaft 52, and the second screw 54 is formed on the screw shaft 55 and the circumferential surface of the screw shaft 55. Flight 56.

  An end portion 52a of the screw shaft 52 of the first screw 51 is disposed so as to penetrate the side surface in the axial direction of the barrel casing 62, and a screw drive device 57 that rotationally drives the end portion 52a of the screw shaft 52 includes: It is provided on the side surface of the barrel casing 62. The screw drive device 57 includes a drive motor 58 (see FIG. 2) and a gear box 59 that converts the driving force of the drive motor 58 into a predetermined rotation amount to drive the first screw 51 to rotate. .

  The downstream end of the conveying pipe 63 in the barrel 6 is a discharge port 63a through which the powder raw material is discharged from the barrel 6, and the discharge port 63 a communicates with the discharge casing 7. The discharge casing 7 is provided with a filter unit 71 that captures the powder raw material that has risen in the internal space.

  In addition, each component in the powder supply apparatus 1 is supported by a common base 8.

  Next, in the powder supply apparatus 1 having such a configuration, the relationship between the screw 5 and the barrel 6 will be described in detail with reference to the schematic configuration diagram of the powder supply apparatus 1 shown in FIG.

  As shown in FIG. 3, the barrel 6 is roughly divided into two zones in the conveying direction. Specifically, as the two zones, the first zone S1 into which the powder raw material is introduced and the powder raw material conveyed from the first zone S1 are compressed, and the powder raw material is moved out of the barrel 6. It is divided into a second zone S2 for discharging.

  The first zone S1 is mainly configured by the barrel casing 62 and the first screw 51, but may be a case where a part of the transport pipe 63 and the second screw 54 is included. In the first zone S 1, the powder raw material stirred by the agitator 3 is introduced into the introduction space 61 formed between the barrel casing 62 and the first screw 51 through the hopper 2 and the introduction casing 4. Is done. As shown in FIGS. 1 and 3, in the first zone S1, the angle of the flight 53 (the angle formed by the axial direction and the flight 53) is set to be relatively small, and the pitch of the flight 53 is ensured to be wide. Thus, the powder raw material is introduced more uniformly between the flights 53.

  The second zone S <b> 2 is mainly configured by the transport pipe 63 and the second screw 54. In the second zone S2, the conveyance pipe 63 has a narrowed shape so that the diameter of the conveyance pipe 63 on the downstream side is smaller than the upstream side in the conveyance direction. For this reason, the volume of the space formed between the second screw 54 and the inner periphery of the transport pipe 63 decreases as it goes downstream, whereby the powder raw material is compressed. By compressing the powder raw material in the second zone S2, the powder raw material between the flights 56 is consolidated, and the powder raw material being conveyed can be quantified and uniformized. In the second zone S2, the angle of the flight 56 is set to be relatively large, and the pitch of the flight 56 is set to be relatively narrow.

  The powder raw material compressed in the transport pipe 63 is quantitatively transported toward the discharge port 63a and is discharged into the discharge casing 7 from the discharge port 63a.

  Here, FIG. 5 shows a side view of the first screw 51 disposed in the first zone S1. Moreover, the shape of the flight 53 of the several position V1 to V5 of the axial direction in the 1st screw 51 of FIG. 5 is shown to FIG. 6A to FIG. 6E.

  As shown in FIG. 5, in the first zone S1, the first screw 51 arranged in the barrel casing 62 is formed with a flight 53 arranged by rotating the peripheral surface of the screw shaft 52 spirally about four times. Has been. In the first zone S1, the pitch and angle of these flights 53 are constant.

  Further, as shown in FIGS. 6A to 6E, each flight 53 of the first screw 51 is formed with a notch 53 a extending from the outer edge of the flight 53 to the inner peripheral surface of the screw shaft 52. Yes. The notch 53a is formed along the radial direction of the first screw 51 as, for example, a rectangular slit-shaped opening. In addition, in the external view of the 1st screw 51 of FIG. 5, illustration of these notch parts 53a is abbreviate | omitted.

  As shown in FIGS. 6A to 6E, the notches 53a are formed at a constant angular pitch θ (for example, an angular pitch of 135 degrees) with respect to the flight 53 formed in a spiral shape, for example. . The flight 53 (flight corresponding to the view V1 in the drawing) 53 located at the upstream end portion in the conveying direction of the powder raw material is not formed with a notch 53a, and the flight 53 located downstream from this portion is not formed. Thus, a notch 53 is formed.

  Further, as shown in FIGS. 6A to 6E, in the axial direction of the first screw 51, the notch portions 53a formed in the adjacent flights 53 are formed so that their circumferential positions (that is, phases) are different from each other. Has been. For example, the arrangement of the cutout portions 53a in the flight 53 viewed from V3 shown in FIG. 6C is the same as the arrangement of the cutout portions 53a in the flight 53 viewed from V2 shown in FIG. 6B and the view from V4 shown in FIG. Each notch 53a is formed so as to be different from the arrangement of the notch 53a in the flight 53.

  Here, a developed view of the flight 53 of the first screw 51 is shown in FIG. In this development view, the circumferential direction πD (D is the flight diameter) of the first screw 51 is developed on a plane, arranged in the vertical direction, and the axial direction is arranged in the horizontal direction.

  As shown in FIG. 7, for example, a machining line 53 b (virtual line) inclined with respect to the cross section of the screw shaft 52 in an opposite direction to the flight 53 by an angle approximately equal to the formation angle of the flight 53 Each notch 53a is formed by cutting the intersecting portion. Therefore, although the cutout portions 53a and the first screw 51 are formed side by side along the rotation direction, the cutout portions 53a adjacent to each other in the axial direction have different formation positions.

  In the first zone S <b> 1, the plurality of notches 53 a are formed in the flight 53 of the first screw 51, so that the powder raw material introduced between the flights 53 is secondly driven by the rotation of the first screw 51. A part of the powder raw material can be returned to the space between the flights 53 located on the downstream side through the cutouts 53a of the flights 53 while being conveyed toward the zone S2. When there are many powder raw materials arranged between the flights 53 in the first zone S1 by utilizing the resistance generated by the compression process performed on the powder raw material in the second zone S1, the notch 53a. The amount of part of the powder raw material that escapes through can be increased, and when the amount of powder raw material is small, the amount of part of the powder raw material escaped through the notch 53a can be reduced. Thereby, the bulk density of the powder raw material between the flights 53 conveyed in the first zone S1 can be made uniform, and a stable compression process can be performed in the second zone S2.

  In addition, since the notch 53a is not formed in the flight 53 at the upstream end portion of the first screw 51, the powder raw material introduced into the first zone S1 is not wasted and the second zone S2 is not wasted. Can be transported.

  Furthermore, since the circumferential formation position (phase) of the notch 53a is different between the flights 53 adjacent in the axial direction, the amount of powder raw material escaped through the notch 53a becomes excessive. This can be suppressed. Note that the width and the formation pitch of the notches 53a are preferably determined in consideration of the balance between the amount of powder raw material escaped and the amount of conveyance.

  Next, the configuration near the downstream end in the second zone S2 will be described. In the vicinity of the discharge port 63a of the transport pipe 63, a plurality of dispersion members 64 fixed to the inner surface of the transport pipe 63 are provided so as to protrude from the inner surface of the transport pipe 63 toward the internal space. As shown in FIG. 4, which is a cross-sectional view taken along line AA in FIG. 3, four dispersion members 64 are provided as, for example, rod-shaped members, and extend from the inner surface of the transport pipe 63 toward the center in the radial direction. Are arranged. A gap that does not contact each other is secured between the tip of the dispersion member 64 and the peripheral surface of the screw shaft 55 of the second screw 54. The dispersion member 64 is fixed to the transport pipe 63, and the second screw 54 is rotated relative to the dispersion member 64. Utilizing this relative rotation, the powder raw material compressed in the second zone S2 and the respective dispersion members 63 are brought into contact with each other, whereby a shearing force is effectively applied to the powder raw material. And the powder raw material can be uniformly dispersed.

  Further, since such a dispersion member 64 is provided in the vicinity of the discharge port 63 a of the transport pipe 63, resistance is given to the powder raw material transported in the transport pipe 63 from the plurality of dispersion members 64. be able to. By imparting such resistance, the compression action on the powder raw material can be enhanced.

  Further, as shown in the external views of the second screw 54 in FIGS. 3 and 8, at the position where the dispersion member 64 is provided in the second zone S2, in the circumferential direction (that is, the rotation direction of the second screw 54). (Noted) are formed in the flight 56 to prevent interference between the respective dispersion members 64 and the flight 56. Such a cutout 57 is preferably formed in a size that does not allow the dispersion member 64 and the flight 56 to contact each other.

  Further, in the second zone S2, the flight 58 of the second screw 54 is also formed downstream of the installation position of the dispersion member 64. By this flight 58, it is possible to apply a thrust force to advance the powder raw material dispersed by the dispersion member 64.

  An operation of conveying and supplying the powder raw material in the powder supply apparatus 1 of the first embodiment having such a configuration will be described.

  First, when a powder raw material is introduced into the hopper 2, the charged powder raw material is introduced into the introduction casing 4. In the stirring space 41 of the introduction casing 4, the stirring member 31 is rotationally driven by the agitator driving device 32 to stir the powder raw material, thereby suppressing the occurrence of partial aggregation such as a bridge. At the same time, the powder raw material is introduced into the first zone S 1 in the barrel 6.

  In the first zone S 1, the first screw 51 is disposed in the barrel casing 62, and the introduced powder raw material is introduced into the space between the flights 53 of the first screw 51. The first screw 51 is rotationally driven by a screw driving device 57, and the powder raw material introduced between the flights 53 is conveyed along the axial direction by the rotational driving of the first screw 51, and enters the second zone S2. Head to.

  On the other hand, since a plurality of notches 53a are formed in the flight 53, a part of the powder raw material is returned to between the upstream flights 53 through the notches 53a. Using the resistance formed in the second zone S2, the escape amount through the notch 53a according to the amount of the powder raw material introduced and arranged between the flights 53 is adjusted. Therefore, in the process in which the powder material is conveyed from the first zone S1 to the second zone S2, the bulk density of the powder material arranged between the flights 53 is made uniform, and the conveyed powder Variations in the quantitativeness of raw materials can be suppressed.

  In the second zone S2, the second screw 54 is rotationally driven by the screw driving device 57 together with the first screw 51. The powder raw material conveyed from the first zone S <b> 1 is moved between the flights 56 of the second screw 54 and is conveyed along the axial direction by the rotational drive of the second screw 54. In the second zone S2, the volume of the space formed between the second screw 54 and the inner periphery of the transport pipe 63 is set so as to decrease as it goes downstream. The powder raw material is compressed. As described above, since variation in the quantitative property of the powder raw material conveyed from the first zone S1 to the second zone S2 is suppressed, when the compression processing is performed on the powder raw material in the second zone S2. The occurrence of pulsation is suppressed.

  Furthermore, since the plurality of dispersion members 64 are provided in the vicinity of the discharge port 63a of the transport pipe 63, the dispersion member 64 becomes a resistance, and the compressing action on the powder raw material to be transported can be enhanced. By compressing the powder raw material in this manner, the powder raw material can be arranged in a state of being compacted between the flights 56, and the bulk density of the powder raw material can be kept constant.

  On the other hand, in the second zone S <b> 2, the powder raw material is conveyed while rotating along the inner periphery of the conveying pipe 63 by the second screw 54 being driven to rotate. When the powder raw material thus conveyed comes into contact with the respective dispersion members 64 fixed to the conveyance pipe 63, the powder raw material is consolidated by the relative rotation of the powder raw material with respect to the dispersion member 64. On the other hand, a shearing force is applied from the dispersion member 64. The powder raw material consolidated by this shearing force is effectively dispersed, and the powder raw material in the consolidated state is uniformly dispersed.

  The powder raw material in the dispersed state is given a thrust to advance by the flight 58 provided on the downstream side of the dispersing member 64. Thereby, the powder raw material in a uniformly dispersed state is discharged in a quantitative and uniform state into the discharge casing 7 from the discharge port 63a.

  According to the powder supply apparatus 1 of the first embodiment, the plurality of notches 53a are formed in the flight 53 of the first screw 51 in the first zone S1, and thus introduced between the flights 53. While conveying the powder raw material toward the second zone S2 by the rotational drive of the first screw 51, a part of the powder raw material is returned to the space between the flights 53 located on the downstream side through the notch 53a of the flight 53. be able to. Thereby, it is possible to suppress variation in the quantitative property of the powder raw material between the flights 53 conveyed in the first zone S1, and it is possible to perform stable compression processing in the second zone S2, and pulsation occurs. This can be suppressed.

  In addition, since the circumferential formation position (phase) of the notch 53a is different between the flights 53 adjacent in the axial direction, the amount of powder material escaped through the notch 53a becomes excessive. This can be suppressed and transportability is not impaired.

  In the second zone S2, the volume of the space formed between the second screw 54 and the inner periphery of the transport pipe 63 is set so as to decrease as it goes downstream. The powder raw material can be compressed along with the conveyance of the above. Further, since a plurality of dispersion members 64 are provided in the vicinity of the discharge port 63a of the transport pipe 63, resistance is given to the powder raw material to be transported by the dispersion member 64, and compression action on the powder raw material Can be increased. By compressing the powder raw material in this way, the powder raw material can be arranged in a compacted state between the flights 56, and the bulk density of the powder raw material can be kept constant in the second zone S2. Can do.

  In the second zone S <b> 2 of the barrel 6, a plurality of dispersion members 64 fixed to the transport pipe 63 are provided so as to protrude from the inner surface of the transport pipe 63 toward the internal space. Therefore, the powder raw material conveyed while rotating along the inner periphery of the conveying pipe 63 by the rotation drive of the second screw 54 is rotated relative to the respective dispersion members 64. Therefore, by bringing the powder material compressed and consolidated in the second zone S2 into contact with the dispersion member, the dispersion effect on the powder material can be enhanced by utilizing relative rotation.

  Further, since the flight 58 is provided on the downstream side of the installation position of the dispersion member 64, a propulsive force that moves forward is given to the powder raw material dispersed by the dispersion member 64, and quantitatively. It can be discharged from the discharge port 63a.

  Therefore, in the powder supply apparatus 1, the quantitativeness and uniformity of the powder raw material conveyed and supplied can be improved.

(Embodiment 2)
In addition, this invention is not limited to the said Embodiment 1, It can implement in another various aspect. For example, FIG. 9 shows the configuration of the powder supply apparatus 101 according to the second embodiment of the present invention. In FIG. 9, the same reference numerals are given to the same components as those of the powder supply device 1 of the first embodiment, and the description thereof is omitted. Hereinafter, only differences from the powder supply apparatus 1 of the first embodiment will be described.

  As shown in FIG. 9, in the second zone S2, the powder supply apparatus 101 according to the second embodiment is provided with an enlarged portion having an enlarged barrel inner diameter at the downstream end portion of the transport pipe. This is different from the powder supply apparatus 1 of the first embodiment.

  Specifically, the downstream end of the transport pipe 163 connected to and communicated with the barrel casing 62 is formed to have a diameter larger than the diameter of the portion reduced in the second zone S2. This portion is an enlarged portion 165 having an enlarged internal volume.

  A dispersion member 64 is installed at the entrance of the enlarged portion 165. Further, in the portion of the second screw 54 arranged in the enlarged portion 165, the outer diameter of the flight 158 is enlarged more than the upstream flight 56 in accordance with the diameter of the enlarged portion 165 of the transport pipe 163. A flight notch 57 is provided between the upstream flight 56 and the downstream flight 158 to prevent interference between the dispersion member 64 and the flight.

  In this way, in the second zone S2, by providing the barrel 6 with the enlarged portion 165, a space in which the powder raw material can be agitated can be secured around the dispersion member 64 (particularly on the downstream side). The dispersion effect on the body material can be further enhanced. Therefore, in the second zone S2, the powder raw material consolidated on the upstream side of the dispersion member 64 is effectively dispersed by the dispersion member 64 in the enlarged portion 165, and the dispersed powder. The body material can be conveyed downstream by the flight 158 and discharged in a quantitative and uniform state from the discharge port 165a.

  Also in the powder supply apparatus 101, since the notch 53a is formed in the flight 53 of the first screw 51, the quantitative measurement of the powder raw material conveyed from the first zone S1 to the second zone S2 is achieved. It is possible to suppress the occurrence of variations. Therefore, the occurrence of pulsation or the like in the second zone S2 can be suppressed, and stable compression processing can be performed.

(Embodiment 3)
Next, the structure of the powder supply apparatus 201 concerning Embodiment 3 of this invention is shown in FIG. In FIG. 10, the same components as those in the above-described embodiment of the powder supply apparatus are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 10, in the powder supply apparatus 201, the configuration of the screw and the barrel is mainly illustrated.

  As shown in FIG. 10, the powder supply apparatus 201 includes a first screw 251 disposed in the barrel casing 62 and a second screw 254 coupled to the first screw 251 and disposed in the transport pipe 263. A screw 205 configured and a barrel 206 in which the screw 205 is disposed are provided. The first screw 251 has a screw shaft 252 and a flight 253 formed on the circumferential surface of the screw shaft 252, and the second screw 254 is formed on the screw shaft 255 and the circumferential surface of the screw shaft 255. Flight 256.

  The barrel 206 includes a barrel casing 62 and a transport pipe 263 that communicates with and extends to the barrel casing 62. In the barrel 206, the first screw 251 is mainly disposed in the barrel casing 62, and this portion is the first zone S1, and the second screw 254 is mainly disposed in the transport pipe 263, and this portion is This is the second zone S2. Unlike the transport pipes of the first and second embodiments, the transport pipe 263 is formed to have a constant diameter along the transport direction without being enlarged or reduced in diameter.

  In the first zone S1, as shown in FIG. 10, the angle of the flight 253 is set to be relatively small, and the pitch of the flight 253 is ensured so that the powder raw material is introduced more uniformly between the flights 253. To be. A plurality of notches (not shown) are formed in the flight 253 of the first screw 251 in the same manner as in the first and second embodiments.

  On the other hand, in the second zone S2, the angle of the flight 256 is set larger than the angle in the first zone S1, and the pitch of the flight 256 is set narrower than the pitch in the first zone S1. In the second zone S <b> 2, the angle and pitch of the flight 256 are set as described above, whereby the powder raw material conveyed along with the rotation of the screw 205 is compressed. By compressing the powder raw material in the second zone S2, the powder raw material between the flights 256 is consolidated, and the powder raw material being conveyed can be quantified and uniformized.

  As shown in FIG. 10, a plurality of dispersion members 64 are arranged in the vicinity of the discharge port 263 a of the transport pipe 263 so as to protrude in the radial direction from the inner peripheral surface of the transport pipe 263. The plurality of dispersion members 64 are provided at a plurality of locations in the axial direction of the transport pipe 263. That is, the plurality of dispersion members 64 are provided in multiple stages in the axial direction of the transport pipe 263. For example, eight dispersion members 64 are radially arranged at equal intervals, and these eight dispersion members 64 are provided at three positions (that is, three stages) in the axial direction of the transport pipe 263, respectively. Yes. Further, the radial arrangement of the dispersion member 64 shown in FIG. 11 which is a sectional view taken along the line BB in FIG. 10 is different from the radial arrangement of the dispersion member 64 shown in FIG. 12 which is a sectional view taken along the line CC. Thus, the installation positions (circumferential positions) of the dispersion members 64 adjacent in the axial direction are set so as not to overlap each other in the axial direction. In FIG. 10, only the attachment position of the dispersion member 64 on the inner peripheral surface of the transport pipe 263 is shown, and the specific attachment state of each dispersion member 64 is shown in FIGS. Yes.

  By disposing the dispersing member 64 in this way, the powder raw material and the dispersing member 64 can be efficiently contacted, and the dispersion effect on the powder raw material can be enhanced. In addition, since the plurality of dispersion members 64 can provide resistance to the powder raw material that is transported in the transport pipe 263, the compressing action of the powder raw material can be enhanced in the transport pipe 263.

  In the second screw 254, the flight 256 is not formed at a location where the dispersion member 64 is installed, and interference between the dispersion member 64 and the second screw 254 is prevented. Further, a space 265 in which no flight 256 exists is disposed between the plurality of dispersion members 64 and the downstream end portion of the second screw 254 in the transport direction of the flight 256. In this space 265, resistance can be given from the plurality of dispersion members 64 to the powder raw material conveyed by the rotational drive of the second screw 254, and the compression action can be effectively enhanced.

  As shown in FIG. 10, a plurality of discharge blades 281 for discharging the powder raw material in the discharge pipe 263 from the discharge port 263 a are provided in the discharge port 263 a of the transport pipe 263. Here, details of the discharge blade 281 are shown in FIGS. 13A and 13B.

  As shown in FIGS. 10, 13A, and 13B, the discharge vane 281 is formed of a plate-like member, is fixed to the end of the screw shaft 255 of the second screw 254, and is radial from the circumferential surface of the screw shaft 255. It extends to. Each discharge blade 281 is formed such that the outer portion is inclined with respect to the central portion in the radial direction. Specifically, each discharge blade 281 is rotationally driven integrally with the screw shaft 255, and in a direction to apply a thrust in the conveying (discharge) direction to the surrounding powder raw material by being rotationally driven. The outer part is inclined. In the third embodiment, for example, eight discharge blades 281 are provided at equal intervals. As shown in FIG. 10, a part of the discharge blade 281 is located in the transport pipe 263 and the other part is located outside the transport pipe 263.

  By providing the plurality of discharge blades 281 in this way, a propulsive force in the conveying direction can be given to the powder raw material after passing through the dispersion member 64 by the inclined portion of the discharge blade 281, The powder raw material can be discharged stably from the discharge port 263a.

  Further, since the discharge blade 281 is fixed to the screw shaft 255 and is rotationally driven by the screw shaft 255, it is necessary to provide a dedicated drive device for rotationally driving the discharge blade 281. There is no.

  In addition, since a part of the discharge blade 281 is positioned outside the transport pipe 263, the powder raw material in the transport pipe 263 can be efficiently discharged.

  In addition, the edge of the inclined portion or the outer peripheral end of the rotationally driven discharge blade 281 contacts the powder raw material, so that the dispersion effect of the powder raw material can be enhanced.

  Further, as shown in FIG. 13A, a plurality of discharge blades 281 are disposed so as to overlap in the axial direction near the center (particularly near the periphery of the screw shaft 255) in the radial arrangement of the discharge blades 281. Therefore, in such overlapping regions, it is possible to provide resistance to the powder raw material being conveyed, and to obtain an effect of increasing the compression action on the powder raw material. Further, by changing the area of such overlapping regions, it is possible to adjust the compression effect by changing the resistance applied to the powder raw material.

  Moreover, in the 1st zone S1, since the some notch part is formed in the flight 253 of the 1st screw 251, it can suppress that a pulsation etc. arise in 2nd zone S2.

  According to the powder supply apparatus 201 of the third embodiment, it is possible to improve the quantitativeness and uniformity of the powder raw material conveyed and supplied.

(Embodiment 4)
Next, the structure of the powder supply apparatus 301 concerning Embodiment 4 of this invention is shown in FIG. In FIG. 14, the same components as those in the above-described embodiment of the powder supply apparatus are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 14, in the powder supply apparatus 301, in the 1st screw 351 and the 2nd screw 354 which comprise the screw 305, each flight is formed with the same form (pitch, angle), This is different from the screw 205 of the third embodiment described above. The configuration other than the flight configuration is the same as that of the third embodiment. In particular, the point that a plurality of notches (not shown) are formed in the flight of the first screw 351 is the same as in the above-described embodiments.

  In this way, even if the flight is formed at a constant pitch and angle in the screw 305, resistance can be imparted to the conveyed powder raw material by the plurality of dispersion members 64. Therefore, the powder raw material can be compressed.

  In the above description, the case where a plurality of notches 53a are formed in the flight 53 of the first screw 51 in the first zone S1 has been described as an example. However, in the first zone S1, at least one notch is formed. If the notch 53a is formed, the powder material can be returned between the flights 53 on the upstream side, and variation in quantitativeness can be suppressed. However, it is possible to effectively achieve variation in quantitativeness by providing a plurality of notches having a relatively small opening area rather than providing only one notch having a large opening area. In addition, it is preferable to form one or more notches 53a per rotation for the flight 53 that extends around the screw shaft 52 in a spiral manner.

  Further, in the first zone S1, the location where such a notch 53a is provided is the position of the flight 53 of the first screw 51 corresponding to the region of the barrel casing 62 in which the opening communicating with the stirring space 41 is formed. A part is preferred. If it is such a part, since the 1st screw 51 is not in the state where the whole peripheral surface is surrounded by the barrel casing 62, the return | restoration effect | action of the powder raw material through the notch part 53a can be implement | achieved effectively. .

  Further, in the first zone S1, a notch 53a may be formed in the flight 53 of the first screw 51 corresponding to the portion surrounded by the transport pipe 63. However, in such a portion, the first screw 51 is in a state where the entire peripheral surface thereof is surrounded by the transport pipe 63, so that it is possible to effectively obtain the returning action of the powder raw material. It is preferable that the flight 53 arranged in is within one rotation.

  Moreover, although the case where the notch 53a is formed in a slit shape so as to extend from the edge of the flight 53 to the peripheral surface of the screw shaft 52 is exemplified, the notch is the peripheral surface of the screw shaft 52. It may be a case where it is formed so as not to reach the point. Further, the cutout portion may be formed to extend in an inclined direction with respect to the radial direction of the first screw 51, or may have an arc shape.

  In the above description, the case where the plurality of dispersion members 64 are provided in the second zone S2 has been described as an example. However, if at least one dispersion member 64 is provided, a dispersion effect on the powder raw material can be obtained. it can.

  The dispersion member 64 may be a plate-like member in addition to a rod-like member, and may adopt various cross-sectional shapes such as a circular shape and a triangular shape. Further, as the dispersing member 64 approaches the screw shaft 255 from the inner peripheral surface of the transport pipe 263, the cross section thereof may be narrowed. Thereby, the uniformity of the bulk density of the powder raw material that has been subjected to the dispersion treatment can be improved.

  Further, the dispersion member 64 may be a fixed form in which the dispersion member 64 is directly or indirectly fixed to the inner surface of the transport pipe 63 or the like and the second screw 54 is rotated relative to the dispersion member 64.

  Further, in the embodiment of FIG. 4 and the like, the embodiment has been described in which the four dispersion members 64 are extended from the inner surface of the transport pipe 63 toward the center in the radial direction. May be a direction inclined with respect to the radial direction. Moreover, the case where the some dispersion | distribution member 64 is integrally formed may be sufficient. For example, an annular member having a plurality of projecting portions protruding in the radial direction from the annular inner peripheral surface may be employed as the plurality of dispersing members.

  11 and 12, an example has been described in which a plurality of dispersing members 64 provided in multiple stages have the same length, but the length of the dispersing member 64 may be different depending on each stage. For example, with respect to the first stage dispersion member 64 (the stage corresponding to FIG. 8), the length of the second stage dispersion member (the stage corresponding to FIG. 9) is shortened, and the tip of the dispersion member and the screw 255 are reduced. You may enlarge the distance between the surrounding surfaces. In such a case, the uniformity of the bulk density of the powder raw material subjected to the dispersion treatment can be improved.

  Further, if the dispersion member 64 is provided on the downstream side of the second zone S2 that compresses the powder raw material, a dispersion effect on the powder raw material can be obtained. Accordingly, the hopper 2, the agitator 3, the introduction casing 4, the first zone S <b> 1 of the barrel 6, etc. can take forms other than those described above.

  Further, the screw 5 has been described as an example in which the first screw 51 having a single thread and the second screw 54 having a double thread are connected, but the screw 5 may have an integral structure. In addition, various specifications may be adopted for the number of threads. In addition, as described above, various types of screws such as a coil screw can be employed.

  Moreover, the powder supply apparatus 1 is provided with a measuring device for measuring the weight of the powder raw material in the apparatus, and the weight of the powder raw material in the apparatus is reduced by the powder raw material being transported and discharged outside the apparatus. It is good also as a powder supply apparatus which measures this and makes the amount of weight reduction quantitative.

  In addition, it can be made to show the effect which each has by combining suitably arbitrary embodiment of the said various embodiment.

DESCRIPTION OF SYMBOLS 1 Powder supply apparatus 2 Hopper 3 Agitator 4 Casing for introduction 5 Screw 6 Barrel 7 Casing for discharge 8 Common base 51 First screw 52 Screw shaft 53 Flight 53a Notch part 54 Second screw 62 Barrel casing 63 Conveying pipe 64 Dispersing member

Claims (4)

A powder supply device for conveying and supplying a powder raw material using a screw,
A screw that is rotationally driven to convey the powder raw material in the axial direction;
A screw is disposed in the internal space, the powder raw material is introduced into the first zone, and the powder raw material conveyed from the first zone is compressed by rotating the screw, and the powder raw material is discharged from the outlet. A barrel with a second zone to be more discharged,
In the first zone, a notch is formed in the screw flight, and the powder raw material introduced between the screw flights is conveyed toward the second zone by the rotation of the screw, and a part of the powder raw material is cut. A powder supply apparatus in which the powder raw material is conveyed so as to be returned between flights on the upstream side in the conveyance direction through the notch.   In the screw arranged in the first zone, the flight is arranged so as to extend a plurality of rotations around the screw shaft, and one or more notches per rotation for a flight extending a plurality of rotations The powder supply apparatus according to claim 1, wherein:   3. The powder supply apparatus according to claim 1, wherein in the screw disposed in the first zone, a notch is not formed in a flight located at an upstream end of the powder raw material in the conveyance direction.   An opening for introducing the powder raw material into the first zone is formed in a part of the barrel in the first zone, and a plurality of flights of screws arranged in the barrel portion where the opening is formed The powder supply apparatus according to any one of claims 1 to 3, wherein a notch is formed.

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