JP2013063849A - Powder feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance quantitativeness and uniformity in the powder supply of conveying and feeding a powder material along the axial direction of a barrel by rotationally driving a screw arranged in the barrel.SOLUTION: The powder feeder includes a plurality of discharge blades each arranged at the discharge port of the barrel, driven to rotate about the axis of the barrel, and also including a surface inclined with respect to the axial cross section of the barrel. The plurality of discharge blades are configured so that, by rotational driving of the discharge blades, thrust in the direction outside the discharge port is applied to the powder material at the inclined surface while applying resistance to the powder material in the charging space, conveyed in the axial direction of the barrel, and then, the powder material is dispersed and discharged from the discharge port of the barrel.

Description

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

  Conventionally, various types of powder supply devices of this type are known. For example, in a conventional powder supply device, a screw material arranged in a barrel is driven to rotate, so that the powder raw material introduced into the barrel at the introduction portion is conveyed to the discharge portion along the barrel axis direction. Then, it has a configuration that is supplied to the outside of the barrel at the discharge portion (see, for example, Patent Document 1). The space between the introduction part and the discharge part in the barrel is a compression part. In this compression part, the flight distance of the screw is narrowed compared to other parts, so that the powder raw material to be conveyed is consolidated. Processing is performed.

  At the barrel end portion in the discharge portion, a plurality of rod-shaped dispersion vanes formed to protrude in the radial direction from the peripheral surface of the screw shaft are provided. When the powder raw material compacted and quantified in the compression unit comes into contact with the dispersion blade that is rotationally driven together with the screw shaft, the powder raw material is dispersed and discharged from the end portion of the barrel.

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, a plurality of rod-shaped dispersion blades fixed to the peripheral surface of the screw shaft are rotated together with the screw shaft to come into contact with the compacted powder material, whereby the powder material A configuration that disperses these is employed. In such a configuration, although a certain degree of dispersion effect can be obtained, there is a problem that it may be difficult to stably exhibit quantitativeness and uniformity depending on the characteristics of the powder raw material.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, and by rotating and driving a screw disposed in a barrel, the powder material is conveyed and supplied along the axial direction of the screw. An object of the present invention is to provide a powder supply device that can improve quantitativeness and uniformity in supply.

  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, the barrel having an inlet and an outlet for the powder raw material, and the internal space of the barrel It is arranged in the axial direction of the screw, and is arranged at the discharge port of the barrel by being rotationally driven, and is driven to rotate about the axis of the screw as the rotation center, and in the axial cross section of the screw And a plurality of discharge vanes provided with a powder raw material filling space adjacent to the barrel discharge port and free of screw flight in the internal space of the barrel. While discharging the powder raw material in the inclined direction by rotating the plurality of discharge vanes while giving resistance to the powder raw material in the filling space conveyed in the axial direction of the screw. Giving thrust of extraoral direction, to discharge the powder material from the discharge port of the barrel, to provide a powder supply device.

  According to the second aspect of the present invention, at the bottom of the discharge port of the barrel, the discharge blade is disposed such that the front end portion in the rotation direction of the discharge blade is located in the barrel and the rear end portion in the rotation direction is located outside the barrel. The powder supply apparatus according to the first aspect, in which the blades are disposed across the outlet of the barrel.

  According to the third aspect of the present invention, the plurality of discharge vanes are formed so that the width on the outer peripheral side is larger than the width on the inner peripheral side, and the powder supply according to the first aspect or the second aspect Providing equipment.

  According to the fourth aspect of the present invention, in the third aspect, the plurality of discharge blades are formed such that the interval between the edges of the discharge blades adjacent in the rotation direction is smaller on the outer peripheral side than on the inner peripheral side. A powder supply apparatus is provided.

  According to the fifth aspect of the present invention, in the first aspect or the second aspect, the plurality of discharge vanes are formed so that the inner circumferential width and the outer circumferential width are substantially the same size. A powder supply apparatus is provided.

  According to the sixth aspect of the present invention, when viewed from the axial direction of the screw, the plurality of discharge blades are arranged so that the edge of one discharge blade adjacent in the rotation direction overlaps the other discharge blade. A powder supply apparatus according to any one of the first to fifth aspects is provided.

  According to the seventh aspect of the present invention, any one of the first to sixth aspects, wherein the plurality of discharge vanes have a resistance imparting region that imparts resistance to the powder raw material in the vicinity of the center around the rotation center. The powder supply apparatus described in 1. is provided.

  According to an eighth aspect of the present invention, the plurality of discharge vanes are driven to rotate together with the screw by a driving device that rotates the screw, and the powder according to any one of the first to seventh aspects. A supply device is provided.

  According to the ninth aspect of the present invention, the screw is a coil screw having a helical coil flight and a rotational driving force transmission shaft fixed to the upstream end of the coil flight in the conveying direction of the powder raw material. Yes, with a plurality of discharge vanes fixed at one end and a discharge vane shaft connected to the rotational driving force transmission shaft at the other end. The discharge vane shaft is arranged on the spiral center of the coil flight and is driven to rotate. The powder supply apparatus according to any one of the first to eighth aspects, which is rotationally driven integrally with a force transmission shaft.

  According to the present invention, the plurality of discharge vanes, which are disposed at the discharge port of the barrel and are rotationally driven about the axis of the screw as a rotation center, and have a surface inclined with respect to the cross section in the axial direction of the screw, While giving resistance to the powder raw material in the filling space conveyed in the axial direction, a rotational drive of a plurality of discharge blades gives thrust to the powder raw material outward on the inclined surface on the inclined surface The powder raw material is discharged from the outlet of the barrel. Therefore, it is possible to increase the uniformity of the bulk density of the powder material in the filling space by applying resistance, and it is possible to increase the dischargeability of the powder material by applying thrust. Therefore, quantitativeness and uniformity can be improved in powder supply.

Sectional drawing of the powder supply apparatus concerning Embodiment 1 of this invention Side view of powder supply device of embodiment 1 Sectional drawing of the powder supply apparatus of Embodiment 1 Front view of the discharge vanes (view along arrow AA in FIG. 3) Side view of discharge blade Front view of the discharge blade of Modification 1 Side view of modified example 1 discharge vane Front view of discharge blade of modification 2 Side view of modified example 2 discharge vane Front view of discharge blade of modification 3 Side view of modified example 3 discharge vane 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. Connection configuration diagram of transport pipe and discharge casing according to modification Structural diagram of boundary portion between barrel casing and screw drive device according to modification Sectional drawing of the powder supply apparatus concerning a modification FIG. 12A is an exploded view of the powder supply apparatus.

  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 around a horizontal rotation axis so as to agitate the powder raw material, and the agitator 3 is introduced. And an agitator driving device 32 that is arranged outside the casing 4 and rotates the plurality of stirring members 31 integrally. 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 51 and a flight 52 formed on the peripheral surface of the screw shaft 51, and a desired clearance is ensured to the extent that the outer peripheral end of the flight 52 does not contact the inner peripheral surface of the barrel 6. In this state, the screw 5 is rotationally driven in the barrel 6 (that is, the barrel casing 62 and the transport pipe 63).

  The end 51a of the screw shaft 51 of the screw 5 is disposed so as to penetrate the side surface in the axial direction of the barrel casing 62. A screw drive device 57 that rotates the end 51 a of the screw shaft 51 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 rotates the screw 5 by converting the drive force of the drive motor 58 into a predetermined rotation amount.

  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 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. Note that the second zone S2 can also be said to be a zone in which the powder raw material is generally transported in the transport pipe 63.

  The first zone S1 is mainly configured by the barrel casing 62 and the portion of the screw 5 surrounded by the barrel casing 62, but may be a case where a part of the transport pipe 63 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 screw 5 through the hopper 2 and the introduction casing 4. .

  The second zone S <b> 2 is mainly configured by a transport pipe 63 and a portion of the screw 5 surrounded by the transport pipe 63. In the second zone S2, the entire periphery of the screw 5 is surrounded by the transport pipe 63, and resistance is applied to the powder raw material to be transported as will be described later, thereby applying a compressing action to the powder raw material. Is done. By compressing the powder raw material in the second zone S2, it is possible to quantify and make uniform the powder raw material being conveyed.

  Further, the powder raw material is quantitatively transported toward the discharge port 63a in the transport pipe 63, and is discharged into the discharge casing 7 from the discharge port 63a. In the first embodiment, the pitch and angle of the flight 52 of the screw 5 (the angle formed by the axial direction and the flight 52) are the same in the first zone S1 and the second zone S2.

  In the second zone S2, a space in which the flight 52 of the screw 5 is not formed (that is, a space in which the flight 52 does not exist) 65 is disposed adjacent to the discharge port 63a of the transport pipe 63. In this space 65, the powder raw material conveyed by the rotational drive of the screw 5 is subjected to a compression action by applying resistance as will be described later, and the bulk density of the powder raw material in the space 65 is made uniform. can do. Therefore, this space 65 can be said to be a powder raw material filling space 65.

  As shown in FIG. 3, the discharge port 63a of the transport pipe 63 is provided with a plurality of discharge blades 81 for discharging the powder material in the discharge pipe 63 from the discharge port 63a. Here, the details of the discharge blade 81 are shown in FIGS. 4A and 4B. 4A is a view taken along the line AA in FIG.

  As shown in FIGS. 3, 4 </ b> A, and 4 </ b> B, the discharge blade 81 is formed of a plate-like member, and is fixed to the end of the screw 5 on the downstream side in the conveying direction of the screw shaft 51. It extends more radially. Each discharge blade 81 is formed with an outer portion inclined with respect to the central portion in the radial direction, that is, each discharge blade 81 is inclined with respect to a cross section in the axial direction of the transport pipe 63. have. Specifically, each discharge blade 81 is rotationally driven integrally with the screw shaft 51 around the axis of the screw shaft 51 as a rotation center, and is conveyed to the surrounding powder raw material by being rotationally driven ( The outer portion is inclined in a direction to give thrust in the (discharge) direction.

  In the first embodiment, for example, eight discharge vanes 81 are provided at equal intervals. In addition, as shown in FIG. 3, a part of the discharge blade 81 is located in the transport pipe 63 and the other part is located outside the transport pipe 63. More specifically, the rotational direction front end portion 81 a of each discharge blade 81 is positioned inside the transport pipe 63, and the rotational direction rear end portion 81 b is positioned outside the transport pipe 63. In FIG. 4A, the rotation direction of each discharge blade 81 is the counterclockwise direction shown in the figure.

  As described above, the plurality of discharge blades 81 are provided, and each discharge blade 81 has an inclined portion, so that the powder raw material in the space 65 is moved in the transport direction by the inclined portion of the discharge blade 81. The powder raw material can be discharged stably from the discharge port 63a.

  Further, since the discharge blade 81 is fixed to the screw shaft 51 and is rotationally driven by the screw shaft 51, a dedicated drive device for rotating the discharge blade 81 needs to be provided. There is no.

  Further, since a part of the discharge blade 81 is positioned outside the transport pipe 63, the powder raw material in the transport pipe 63 can be efficiently discharged.

  Moreover, the dispersion effect of a powder raw material can be heightened when the edge of the discharge blade 81 driven to rotate contacts the powder raw material.

  In addition, as shown in FIG. 4A, a plurality of discharge blades 81 are arranged so as to overlap in the axial direction in the vicinity of the center around the rotation center in the radial arrangement of the discharge blades 81 (particularly in the vicinity of the periphery of the screw shaft 51). . Therefore, in the overlapping region, it is possible to give resistance to the powder raw material to be conveyed, and in particular, it is possible to obtain an effect of increasing the compression action on the powder raw material conveyed in the space 65. is there. By applying such resistance, the bulk density of the powder raw material in the space 65 can be made uniform, and the quantitativeness and uniformity of the powder supply in the powder supply apparatus 1 can be improved. Note that by changing the area of such overlapping regions, it is possible to change the resistance applied to the powder raw material and adjust the compression effect. Moreover, in the discharge blade 81, the region that gives resistance to the powder raw material in this way can also be called a resistance-giving region.

  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 plurality of stirring members 31 are integrally rotated by the agitator driving device 32 to stir the powder raw material, and partial agglomeration such as a bridge is suppressed. The 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 <b> 1, the screw 5 is disposed in the barrel casing 62, and the introduced powder material is introduced into the space between the flights 52 of the screw 5. The screw 5 is rotationally driven by a screw driving device 57, and the powder raw material introduced between the flights 52 is conveyed along the axial direction by the rotational driving of the screw 5 and heads toward the second zone S2.

  In the second zone S2, the powder raw material conveyed from the first zone S1 is conveyed along the axial direction by the rotational drive of the screw 5. In the second zone S2, a plurality of discharge blades 81 are provided at the discharge port 63a of the transport pipe 63, so that the discharge blades 81 become a resistance and can compress the powder raw material being transported. . By compressing the powder raw material in this way, the bulk density of the powder raw material can be kept uniform in the space 65.

  Further, the powder raw material is dispersed so as to be cut off by bringing the edge of the discharge blade 81 into contact with the powder raw material by rotational driving of the plurality of discharge blades 81 provided at the discharge port 63a of the transport pipe 63. Can do. At the same time, the outward thrust of the discharge port 63a is applied to the powder raw material at the inclined portion of each discharge blade 81. Since a part of the discharge blade 81 is located outside the discharge port 63a, the powder raw material is discharged from the discharge port 63a in a state of being uniformly dispersed by the action of the axial thrust and the radial centrifugal force. Is quantitatively discharged into the casing 7.

  According to the powder supply apparatus 1 of the first embodiment, the plurality of discharge blades 81 are provided at the discharge port 63a of the transport pipe 63, thereby providing resistance to the powder raw material in the space 65. The powder raw material can be effectively discharged from the discharge port 63a while dispersing the powder raw material by applying an outward thrust to the powder material at the inclined portion of the discharge blade 81. Therefore, the quantitative property and uniformity of the powder raw material conveyed and supplied can be improved.

(Modification of discharge blade)
In the powder supply apparatus 1 according to the first embodiment, the case where the discharge blade 81 having the form shown in FIGS. 4A and 4B is adopted as an example has been described. However, the form of the discharge blade is limited to such a form. Not. Several modified examples of the discharge blade will be described with reference to the drawings.

(Modification 1)
5A and 5B show a discharge blade 181 according to the first modification. As shown in FIGS. 5A and 5B, in the form according to the first modification, the disk-shaped main body 180 formed around the rotation center and fixed to the screw shaft 51, and radially from the outer periphery of the main body 180. And a plurality of (e.g., 8) discharge vanes 181 formed at regular intervals.

  Each discharge blade 181 is formed such that the inner peripheral width and the outer peripheral width are substantially the same. Each discharge blade 181 is similar to the discharge blade 81 in FIGS. 4A and 4B in that it has a surface that is inclined with respect to the cross section of the transport pipe 63 in the axial direction. Further, the front end portion 181 a in the rotation direction of each discharge blade 181 is positioned in the transport pipe 63, and the rear end portion 181 b in the rotation direction is positioned outside the transport pipe 63.

  The discharge blade 181 having such a configuration is rotationally driven with the rotation of the screw shaft 51, and thrusts the discharge port 63a outward with respect to the powder material on an inclined surface while applying resistance to the powder material. Can be given. In particular, the disk-shaped main body 180 disposed on the inner peripheral side of each discharge blade 181 can effectively provide resistance to the powder raw material, and each discharge blade 181 has a A relatively large gap can be formed in the outer peripheral side portion, and the dischargeability of the powder raw material can be improved. In the first modification, the disk-shaped main body 180 is a resistance applying region that applies resistance to the powder raw material.

(Modification 2)
Next, FIGS. 6A and 6B show a discharge blade 281 according to the second modification. As shown in FIGS. 6A and 6B, in the embodiment according to the second modification, a disk-shaped main body 280 formed around the rotation center and fixed to the screw shaft 51, and a radial shape from the outer periphery of the main body 280. And a plurality of (e.g., eight) discharge vanes 281 formed at regular intervals.

  Each discharge blade 281 is formed in a generally fan shape having a width on the outer peripheral side larger than a width on the inner peripheral side. In addition, regarding the point where each discharge blade 281 is inclined and the point where the rotational direction front end portion 281a is positioned inside the transport pipe 63 and the rotational direction rear end portion 281b is positioned outside the transport pipe 63 This is the same as the first modification.

  The discharge blade 281 having such a configuration can effectively provide resistance to the powder raw material not only at the center side portion (disk-shaped main body portion 280 (resistance imparting region)) but also at the outer peripheral side portion. it can. In particular, resistance is effectively applied to the powder raw material conveyed in the conveying pipe 63 by the rotational drive of the screw 5 in the vicinity of the inner peripheral surface of the conveying pipe 63 (that is, the outer peripheral side portion of the discharge blade 281). The compression effect on the powder raw material can be enhanced. Further, each discharge blade 281 can secure a large area in contact with the powder raw material at the outer peripheral side portion where the rotational speed is the fastest, so that a large thrust and centrifugal force can be applied to the powder raw material, Effectiveness and discharge can be enhanced.

(Modification 3)
Next, FIGS. 7A and 7B show a discharge blade 381 according to the third modification. As shown in FIGS. 7A and 7B, in the embodiment according to the third modification, a disk-shaped main body 380 formed around the rotation center and fixed to the screw shaft 51, and a radial shape from the outer periphery of the main body 380 And a plurality of (for example, eight) discharge vanes 381 formed at regular intervals.

  Each discharge vane 381 is formed in a substantially T shape having a width on the outer peripheral side larger than a width on the inner peripheral side. In addition, regarding the point that each discharge blade 381 is inclined and the point that the rotation direction front end portion 381a is positioned inside the transport pipe 63 and the rotation direction rear end portion 381b is positioned outside the transport pipe 63. This is the same as the first and second modifications.

  In the discharge blade 381 having such a configuration, resistance can be effectively applied to the powder raw material not only at the central portion but also at the outer peripheral portion, and the compression effect on the powder raw material can be enhanced. At the same time, a large thrust and centrifugal force can be applied to the powder raw material, and the dispersion effect and the discharge performance can be enhanced.

  Further, the interval between the edges of the adjacent discharge blades 381 is set so that the outer peripheral side is smaller than the inner peripheral side. Therefore, while ensuring a space for the powder raw material to pass through at a portion on the inner peripheral side where the distance between the edges is relatively large, the portion at the outer peripheral side where the distance between the edges is relatively small is compared with the powder raw material. Resistance, thrust, and centrifugal force. Therefore, it is possible to improve the quantitativeness and uniformity in the powder supply while performing the compression action on the powder raw material.

  In the discharge blades of the above-described modifications 1 to 3, a form in which the discharge blades are arranged so as not to overlap each other when viewed from the axial direction of the transport pipe 63 is employed. You may employ | adopt the form that it arrange | positions so that the edge of one discharge blade which adjoins may overlap with the other discharge blade. In such an overlapping form, the gap between the discharge blades when viewed from the axial direction (referred to as “first gap”) can be greatly reduced or no gap can be present. However, since each discharge blade has an inclined surface, when viewed from the direction orthogonal to the axial direction, the gap between the discharge blades (that is, between the edges in the axial direction of adjacent discharge blades). Distance: “second gap”).

  For example, the resistance given to the powder raw material can be increased by setting the first gap small, and it is necessary for discharging (passing) the powder raw material by setting the second gap large. A sufficient gap area can be secured and the dischargeability of the powder raw material can be improved. In this way, by adjusting the first gap and the second gap, the resistance, thrust, and centrifugal force applied to the powder raw material can be adjusted, and the quantitativeness and uniformity according to the required specifications Can be obtained.

  Thus, it is preferable to comprise the discharge blade which can exhibit a compression action and a dispersion | distribution action by the plate-shaped member which has a wide width dimension with respect to the thickness dimension. Further, the upstream surface in the transport direction of the discharge blade is formed as a surface orthogonal to the axial direction of the transport pipe 63, and the downstream surface in the transport direction is formed as a surface inclined with respect to the axial direction. Also good. In such a discharge vane, resistance can be effectively applied to the powder raw material on the orthogonal surface upstream in the conveying direction, and the powder raw material can be applied to the inclined surface on the downstream side in the conveying direction. On the other hand, thrust can be effectively applied.

(Embodiment 2)
Next, the structure of the powder supply apparatus 101 concerning Embodiment 2 of this invention is shown in FIG. In FIG. 8, the same reference numerals are assigned to the same components as those in the powder supply device of the above-described embodiment, and the description thereof is omitted. In FIG. 8, in the powder supply apparatus 101, the configuration of the screw and the barrel is mainly illustrated.

  As shown in FIG. 8, the powder supply apparatus 101 includes a first screw 151 disposed in the barrel casing 62 and a second screw 154 coupled to the first screw 151 and disposed in the transport pipe 63. A screw 105 is provided, and a barrel 6 in which the screw 105 is disposed. The first screw 151 has a screw shaft 152 and a flight 153 formed on the peripheral surface of the screw shaft 152, and the second screw 154 is formed on the peripheral surface of the screw shaft 155 and the screw shaft 155. Flight 156.

  The barrel 6 includes a barrel casing 62 and a transport pipe 63 that is communicated with and extends to the barrel casing 62. In the barrel 6, the 1st screw 151 is mainly arrange | positioned in the barrel casing 62, and this part becomes 1st zone S1. The second screw 154 is mainly disposed in the transport pipe 63, and this portion is the second zone S2. The transport pipe 63 is formed to have a constant diameter along the transport direction.

  In the first zone S1, as shown in FIG. 8, the angle of the flight 153 is set to be relatively small, and the pitch of the flight 153 is set wide so that the powder material is introduced more uniformly between the flights 153. To be.

  On the other hand, in the second zone S2, the angle of the flight 156 is set larger than the angle in the first zone S1, and the pitch of the flight 156 is set narrower than the pitch in the first zone S1. In the second zone S2, the angle and pitch of the flight 156 are set in this way, whereby the powder raw material conveyed along with the rotation of the screw 105 is compressed. By compressing the powder raw material in the second zone S2, the powder raw material between the flights 156 is consolidated, and the powder raw material being conveyed can be quantified and made uniform. Note that the space adjacent to the discharge port 63a of the transport pipe 63 is provided as a space 65 where there is no flight, and the discharge port 63a is provided with a plurality of discharge blades 81 as described above. This is the same as the first embodiment.

  In such a powder supply apparatus 101 of the second embodiment, the compression effect on the powder raw material can be enhanced in the second zone S2. Furthermore, by providing a plurality of discharge blades 81, the bulk density of the powder raw material conveyed into the space 65 can be made more uniform, and the quantitativeness and uniformity in powder supply can be improved. Can do.

(Embodiment 3)
Next, the structure of the powder supply apparatus 201 concerning Embodiment 3 of this invention is shown in FIG. In FIG. 9, the same reference numerals are assigned to the same components as those in the powder supply device of the above-described embodiment, and the description thereof is omitted.

  As shown in FIG. 9, in the powder supply apparatus 201 of this Embodiment 3, the coil screw 251 is provided as a screw. The coil screw 251 includes, for example, a coil flight 252 formed in a spiral shape having a square cross-sectional shape, and a rotational driving force transmission shaft 253 fixed to the end of the coil flight 252 on the upstream side in the powder material conveyance direction. I have. The rotational driving force transmission shaft 253 is connected to the screw driving device 57 to transmit the rotational driving force, and thereby the coil flight 252 is rotationally driven. In addition, although the case where the coil flight 252 has a square cross section is described as an example, other cross sectional shapes (for example, a circular cross section, etc.) may be employed.

  The plurality of discharge blades 81 installed in the discharge port 63a of the transport pipe 63 is one end (downstream) of a discharge blade shaft 282 disposed on the spiral center of the coil flight 252 (that is, the central axis of the transport pipe 63). It is fixed to the side edge. The other end (upstream end) of the discharge blade shaft 282 is connected to the end of the rotational driving force transmission shaft 253, and the discharge blade shaft 282 is rotationally driven together with the rotational driving force transmission shaft 253. It is configured as follows. The shaft diameter of the discharge blade shaft 282 is smaller than the inner diameter of the coil flight 252.

  In the powder supply apparatus 201, the coil screw 251 is employed, so that the powder raw material having the characteristic that it easily adheres to the surface of a member such as a screw shaft due to the influence of humidity or the like is applied to the coil screw 251. Can be suppressed, and stable conveyance can be performed.

  On the other hand, in such a coil screw 251, the compression action by a screw itself becomes low compared with the screw shaft 5 etc. on the characteristic of the helical coil flight 252. FIG. However, by providing a plurality of discharge blades 81 at the discharge port 63a of the transport pipe 63, it is possible to impart resistance to the powder raw material and enhance the compression action.

  As described above, the coil screw 251 that can suppress the adhesion of the powder raw material due to the influence of humidity or the like is employed, and the decrease in the compression action due to the characteristics of the coil screw 251 is compensated by the provision of resistance by the plurality of discharge blades 81 and is discharged. By imparting thrust with the blades 81, it is possible to enhance the dispersion effect and dischargeability of the powder raw material, and to realize quantitative and uniform conveyance of the powder raw material.

  Further, since the discharge blade shaft 282 for rotating the discharge blade 81 is arranged inside the coil flight 252, it is possible to suppress the powder raw material from staying in the vicinity of the central axis of the transfer pipe 63, and the powder It is possible to improve the quantitativeness and uniformity in the conveyance of the raw material.

  In each of the above embodiments, if a plurality of discharge blades 81 are provided at the discharge port 63a of the transport pipe 63, a thrust is applied and distributed while a resistance is applied to the powder raw material and a compression action is applied. Therefore, the hopper 2, the agitator 3, the introduction casing 4, the barrel 6, the discharge casing 7, etc. can take forms other than those described above.

  Further, the screw 5 has been described by taking the configuration of a single thread as an example, but 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.

  Here, some modified examples of the powder supply device of each of the above embodiments will be described.

  First, in the powder supply apparatus 1 shown in FIG. 1, a discharge port 63 a that is an end portion of a cylindrical transport pipe 63 that constitutes the barrel 6 is connected to a cylindrical surface of a cylindrical discharge casing 7 to communicate with each other. A monstrous configuration is adopted. In such a configuration, the discharge port 63 a is positioned on the cylindrical surface of the cylindrical discharge casing 7. Therefore, the configuration in which a part of the plurality of discharge blades 81 provided in the discharge port 63a is positioned in the transport pipe 63 and the other part is positioned outside the transport pipe 63 is realized at least in the lower part of the discharge port 63a. It only has to be done. Since a part of the discharge blade 81 is positioned outside the transport pipe 63 at least at the lower part of the discharge port 63a, the powder raw material can be discharged from the discharge port 63a while being dispersed by the action of thrust and centrifugal force.

  Here, FIG. 10 shows a connection configuration between the transport pipe 363 and the discharge casing 307 according to the modification. In the configuration shown in FIG. 10, the positions of the discharge port 363 a that is the end of the transport pipe 363 and the central axis S of the discharge casing 307 can be adjusted. Specifically, a side tube 372 is provided on the side surface of the cylindrical discharge casing 307, and the discharge tube 363 is inserted into the side tube 372, and the insertion length thereof is adjusted, whereby the central axis of the discharge casing 307 is adjusted. The position of the discharge port 363a with respect to S can be adjusted. In this modified example, a configuration in which the coil screw 251 of the third embodiment is used as a screw is taken as an example.

  In such a configuration, since the position of the discharge port 363a with respect to the central axis of the discharge casing 307 can be adjusted, it is possible to improve the discharge performance by adjusting the discharge position of the powder raw material. Further, the discharge port 363 a of the transport pipe 363 can be formed in a plane orthogonal to the axial direction of the transport pipe 363. Therefore, each discharge blade 81 can be configured to be partially exposed to the outside of the transport pipe 363 regardless of its rotational position, and the powder material can be discharged well.

  Although a description has been given centering on the form in which a part of each discharge blade 81 is located outside the transport pipe 63 and the other part is located in the transport pipe 63, all the discharge blades 81 are all located in the transport pipe 63. Such a configuration may be adopted. Even if all the discharge blades 81 are disposed in the transport pipe 63, if they are disposed at a position close to the discharge port 63a, the discharge performance can be improved as compared with the case where the discharge blades are not provided.

  Next, a modified example of the structure of the boundary portion between the barrel casing 62 and the screw drive device 57 will be described. In the form shown in FIG. 1, for example, a bush 68 (for example, made of Teflon (registered trademark)) is disposed on the peripheral surface of the screw shaft 51 at the boundary portion between the barrel casing 62 and the screw driving device 57, and the gear box 59. The dust generated from the components in the drive device does not enter the barrel casing 62 from the side. However, it is also conceivable that a gap is generated between the inner peripheral surface of the bush 68 and the peripheral surface of the screw shaft 51 due to aging of the device, and dust enters the barrel casing 62 from this gap.

  For example, in the modification of the configuration of the boundary portion shown in FIG. 11, a bowl-shaped dust intrusion prevention plate 69 that protrudes outward from the peripheral surface of the screw shaft 51 is provided. By adopting such a configuration, it is possible to suppress the ingress of dust into the barrel casing 62 even when a gap is generated on the inner peripheral surface of the bush 68. The dust intrusion prevention plate 69 may be formed integrally with the screw shaft 51 or may be formed separately.

  Next, the structure of the powder supply apparatus 401 according to the modification is shown in FIGS. 12A and 12B. 12B is an exploded view of the powder supply apparatus 401 shown in FIG. 12A.

  As shown in FIGS. 12A and 12B, in the powder supply apparatus 401, a front inspection door 442 is detachably provided on the side surface of the introduction casing 404 using a manual knob 443. By removing the front inspection door 442, it is possible to access the stirring space 441 through an opening provided on the side surface of the introduction casing 404.

  For example, as shown in FIG. 12B, in the agitator 3, by removing the mounting bolts 444 of the plurality of stirring members 31 from the side openings of the introduction casing 404, the stirring member 31 can be easily removed from above the introduction casing 404. It can be taken out.

  Also, as shown in FIGS. 12A and 12B, the powder supply apparatus 401 employs an attachment configuration that facilitates disassembly of components such as the screw 5 and the conveyance pipe 63. Therefore, in the powder supply apparatus 401 according to the modified example, the workability in disassembling / assembling the apparatus becomes good, and the maintainability can be improved.

  In the above description, the case where the powder supply device has a single-shaft configuration including one screw has been described as an example. However, a two-axis configuration including two screws may be adopted, and three or more shafts may be used. A configuration may be adopted.

  It is to be noted that, by appropriately combining any of the above-described various embodiments, the effects possessed by them can be produced.

DESCRIPTION OF SYMBOLS 1 Powder supply apparatus 2 Hopper 3 Agitator 4 Introducing casing 5 Screw 6 Barrel 7 Discharging casing 8 Common base 62 Barrel casing 63 Conveying pipe 81 Discharge vane

Claims (9)

A powder supply device for conveying and supplying a powder raw material using a screw,
A barrel having a powder raw material inlet and outlet;
A screw that is arranged in the internal space of the barrel and that is rotationally driven to convey the powder raw material in the axial direction;
A plurality of discharge vanes disposed at the discharge port of the barrel, driven to rotate about the axis of the screw and having a surface inclined with respect to the cross section in the axial direction of the screw;
In the internal space of the barrel, there is provided a powder raw material filling space that is adjacent to the outlet of the barrel and does not have a screw flight,
The plurality of discharge blades provide resistance to the powder raw material in the filling space conveyed in the axial direction of the screw, while rotating the plurality of discharge blades to the powder raw material on an inclined surface. A powder feeder that discharges powder raw material from the outlet of the barrel by applying thrust outward.   In the lower part of the outlet of the barrel, the outlet blades are arranged across the outlet of the barrel so that the front end portion in the rotational direction of the outlet blade is located in the barrel and the rear end portion in the rotational direction is located outside the barrel. The powder supply apparatus according to claim 1, wherein   The powder supply device according to claim 1 or 2, wherein the plurality of discharge blades are formed so that a width on an outer peripheral side is larger than a width on an inner peripheral side.   The powder supply apparatus according to claim 3, wherein the plurality of discharge blades are formed such that the interval between the edges of the discharge blades adjacent in the rotation direction is smaller on the outer peripheral side than on the inner peripheral side.   The powder supply device according to claim 1 or 2, wherein the plurality of discharge vanes are formed so that the inner circumferential width and the outer circumferential width are substantially the same size.   The plurality of discharge blades are arranged such that, when viewed from the axial direction of the screw, an edge of one discharge blade adjacent to the rotation direction overlaps the other discharge blade. The powder supply apparatus according to one.   The powder supply device according to any one of claims 1 to 6, wherein the plurality of discharge blades have a resistance applying region that applies resistance to the powder raw material in the vicinity of the center around the rotation center.   The powder supply device according to any one of claims 1 to 7, wherein the plurality of discharge blades are rotationally driven together with the screw by a driving device that rotationally drives the screw. The screw is a coil screw having a helical coil flight and a shaft for transmitting a rotational driving force fixed to an end on the upstream side in the conveying direction of the powder raw material in the coil flight,
A plurality of discharge blades are fixed to one end, and the other end includes a discharge blade shaft connected to a rotational driving force transmission shaft,
The powder supply apparatus according to any one of claims 1 to 8, wherein the discharge blade shaft is disposed on the spiral center of the coil flight and is rotationally driven integrally with the rotational driving force transmission shaft.

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