JP2013049478A - Powder bridge prevention device and powder feeding device - Google Patents

Abstract

Provided are a powder bridge prevention device and a powder supply device for preventing bridging that occurs in a powder material while suppressing the influence of the powder material on the powder pressure in the powder conveyance path.
A powder bridging prevention device is arranged so as to face a plurality of linear members arranged in a direction intersecting with a conveyance direction of a powder raw material in a powder conveyance path. A pair of plate-like members that support both ends of the linear member and hold the support form of the linear member, and a rotation that is fixed to the pair of plate-like members and rotates the plurality of linear members via the plate-like member A plurality of linear members rotating in the powder raw material so that all the other linear members rotate on the rotation path of the single linear member. Moved.
[Selection] Figure 3

Description

  The present invention includes a powder bridge prevention device that is arranged in a powder conveyance path surrounded by a casing and prevents bridges that occur in a powder raw material that passes through the powder conveyance path, and a powder bridge prevention device, and a barrel. The present invention relates to a powder supply apparatus that conveys and supplies a powder raw material along the axial direction of a barrel by rotationally driving a screw disposed therein.

  2. Description of the Related Art Conventionally, an apparatus for handling a powder raw material is provided with a powder agitating device that stirs the powder raw material for the purpose of preventing agglomeration or the like from occurring in the powder raw material conveyed in the conveyance path. Such a powder stirrer is generally called an agitator.

  For example, in the fixed amount feeder of Patent Document 1, a stirring device (agitator) is provided between a hopper and a screw conveyor. The stirring device includes a stirring impeller constituted by six stirring blades that rotate integrally with a rotation shaft. As the stirring impeller is rotated, food ingredients, additives, and the like are stirred and supplied in a uniform state into the screw conveyor.

  Moreover, in the powder supply machine of patent document 2, the stirring mechanism (agitator) is provided between the storage tank (hopper) and the discharge device provided with a screw. The stirring mechanism includes a rotating shaft and stirring blades provided in a wing shape around the rotating shaft in the outer circumferential direction of the rotating shaft. By rotating the wing-shaped stirring blade, the powder around it is uniformly stirred and diffused, preventing the occurrence of bridging and arching phenomena, and improving the quantitativeness in powder supply. .

Utility Model Registration No. 3167253 Utility Model Registration No. 3127284

  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 stirring device of Patent Document 1, a plate-like member having a width in the radial direction of the rotation shaft is used as the stirring blade. Therefore, by rotating the stirring impeller, the plate-like member (stirring blade) efficiently comes into contact with surrounding food ingredients, additives, and the like, and a high stirring effect can be obtained.

  However, when the stirring device of Patent Document 1 is applied to a powder supply device, the high stirring effect greatly affects the powder pressure of the powder raw material supplied from the hopper to the screw conveyor. (That is, fluctuation occurs in the powder pressure). In such a case, the powder raw material cannot be quantitatively supplied into the screw conveyor.

  Further, in the stirring mechanism of Patent Document 2, since the blade-shaped stirring blade having a width in the circumferential direction is used, the contact area between the surface in the width direction of the stirring blade and the surrounding powder raw material becomes large. By the friction, the surrounding powder material moves with the stirring blade. Thus, the stirring effect with respect to a powder raw material is acquired by moving the surrounding powder raw material by friction with a stirring blade.

  However, in the configuration in which the stirring effect is obtained by moving the powder material around the stirring blade together with the stirring blade, the powder pressure of the powder material is greatly influenced by the rotation of the stirring blade. As a result, the powder pressure fluctuates, affecting the quantitativeness of the powder raw material supply.

  Such a problem is not only limited to the powder supply apparatus, but also common to various apparatuses that quantitatively convey powder raw materials.

  Accordingly, an object of the present invention is to solve the above-described problems, and prevent bridges generated in the powder material while suppressing the influence of the powder material on the powder pressure in the powder conveyance path. An object of the present invention is to provide a powder bridge prevention device and a powder supply device.

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

  According to a first aspect of the present invention, there is provided a powder bridging prevention device that is arranged in a powder conveyance path surrounded by a casing and prevents bridging that occurs in a powder raw material that passes through the powder conveyance path. A plurality of linear members arranged in a direction intersecting the conveyance direction of the powder raw material in the conveyance path, and arranged so as to face each other, supporting both ends of the plurality of linear members, A pair of plate-like members that hold the support form, and a rotary drive device that is fixed to the pair of plate-like members and has a rotary drive shaft that rotates the plurality of linear members via the plate-like members. Provided is a powder bridge preventing device in which a plurality of linear members are rotated in a powder raw material so that all other linear members are rotated on the rotation path of the linear members.

  According to the second aspect of the present invention, the cross-sectional shape of the plurality of linear members is the powder bridge prevention according to the first aspect, wherein the portions that contact the outer peripheral side and the inner peripheral side of the rotating track are configured by curved surfaces. Providing equipment.

  According to a third aspect of the present invention, there is provided the powder bridge preventing apparatus according to the second aspect, wherein the plurality of linear members have a circular cross section.

  According to the fourth aspect of the present invention, the plurality of linear members have a linear support form between the pair of plate-like members, and the powder according to any one of the first to third aspects. An anti-bridging device is provided.

  According to the fifth aspect of the present invention, there is provided a powder supply apparatus that conveys and supplies a powder raw material using a screw, and a hopper into which the powder raw material is introduced, and is rotated in the axial direction. Screw for conveying powder raw material, first zone in which the screw is disposed in the internal space and the powder raw material is introduced from the hopper, and compression of the powder raw material conveyed from the first zone by rotational driving of the screw And any one of the first to fourth aspects disposed between the barrel having the second zone through which the powder raw material is discharged from the discharge port and the hopper and the first zone of the barrel. And a powder supply device, wherein the powder raw material introduced into the hopper is introduced into the first zone of the barrel through the powder bridge prevention device.

  According to the present invention, when a plurality of linear members whose both ends are supported by a pair of plate-like members are rotated via the plate-like members, the rotation trajectory of the single linear member is changed. All the linear members are configured to be rotated. Thereby, the friction and resistance between a some linear member and the powder raw material of the circumference | surroundings can be decreased. Therefore, by rotating a plurality of linear members in the powder raw material, fluctuations in the powder pressure of the powder raw material can be suppressed while suppressing stirring of the powder raw material, and the powder raw material Can be prevented. Therefore, it is possible to improve the quantitativeness of the powder raw material conveyed through the powder conveyance path.

Sectional drawing of the powder supply apparatus concerning embodiment of this invention Side view of powder supply device of embodiment Configuration diagram of powder bridge prevention device of embodiment AA line sectional view of the powder bridge prevention device of FIG. Schematic configuration diagram of powder supply device of embodiment BB sectional view in the powder supply apparatus of FIG. External view of the second screw

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

(Embodiment)
A configuration of a powder supply apparatus including a powder bridge preventing apparatus according to an 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 device 1 includes a hopper 2, a powder bridge prevention device 3, an introduction casing 4, a screw 5, a barrel 6, and a discharge casing 7. ing.

  In the powder supply apparatus 1 according to this embodiment, for example, a powder or a granular material including 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 an apparatus for supplying a powder raw material to an introduction casing (powder conveyance path) 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 powder bridge preventing device 3 is a device that prevents partial aggregation such as a bridge from occurring in the powder raw material introduced into the introduction casing 4. Specifically, the powder bridge preventing device 3 is disposed in the introduction casing 4, and is provided with a plurality of linear members 31 that are rotationally driven around a horizontal rotation axis in the powder raw material, and the introduction casing. 4 and a rotation driving device 32 that drives the linear member 31 to rotate. Moreover, in the powder raw material conveyed in the introduction casing 4, the plurality of linear members 31 are rotationally driven to prevent agglomeration such as bridges generated in the powder raw material. In addition, the lower surface of the powder conveyance space 41 in the introduction casing 4 is formed as a substantially circumferential surface along the rotation path of the linear member 31 (see FIG. 2). The detailed configuration of the powder bridge prevention device 3 will be described later.

  In the introduction casing 4, the lower part of the powder conveyance space 41 in which the linear member 31 of the powder bridge preventing device 3 is rotated is substantially U-shaped with the upper portion communicating with the powder conveyance space 41. A powder raw material introduction space 61 having a cross section is formed. In the present 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 this embodiment, the barrel 6 includes a barrel casing 62 that forms an introduction space 61 below the powder conveyance space 41 of the introduction casing 4, and a conveyance pipe 63 that communicates with and extends to the barrel casing 62. It is comprised by. In the present embodiment, the 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 a separate member.

  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 powder conveyance space 41 communicate 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, regarding the detailed configuration of the powder bridge prevention device 3 included in the powder supply device 1, FIG. 3 which is a configuration diagram of the main part of the powder bridge prevention device 3, and a cross-sectional view taken along line AA in FIG. This will be described with reference to FIG.

  As shown in FIGS. 3 and 4, the powder bridge prevention device 3 includes a plurality of linear members 31 arranged in the horizontal direction, and a pair of disk members 33 that support both ends of the plurality of linear members 31. The rotary drive shaft 34 is disposed in the same direction as the linear member 31 and is fixed to the pair of disk members 33. The rotation drive shaft 34 is connected to an electric motor included in the rotation drive device 32 (not shown in FIGS. 3 and 4) so as to be rotatable.

  The linear member 31 is, for example, a linear member having a thin cross-sectional shape that cannot be held in a cantilevered support state when rotated in a powder raw material. . Further, the cross-sectional shape is preferably such that the surface area in contact with the powder raw material is as small as possible, for example, it is more preferable to have a circular cross-section. In the present embodiment, as the linear member 31, for example, 16 linear members having a circular cross section having a diameter of 5 mm or less are used.

  Each linear member 31 is supported at both ends thereof in a state where the linear member 31 is arranged at equal intervals on one circumference at the periphery of the disk member 33. By supporting both ends on such a pair of disk members 33, the support form of the linear member 31 having a relatively small circular cross section is held in a straight line. The pair of disk members 33 are arranged orthogonal to the respective linear members 31 arranged in the horizontal direction.

  The rotational drive shaft 34 is formed as a rigid body having a sufficiently large cross section as compared with the linear member 31. The rotation drive shaft 34 is fixed to the pair of disk members 33 at the center of the disk member 33, that is, at the center of the circumferential arrangement of the respective linear members 31.

  In such a powder bridge preventing device 3, when the rotational drive shaft 34 is rotationally driven by the electric motor of the rotational drive device 32, the respective linear members 31 are rotated via the pair of disk members 33. Since each linear member 31 is arranged on one circumference centering on the rotation drive shaft 34, all the other linear members 31 rotate on the rotation trajectory of one linear member 31. Will move.

  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. 5, 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. In addition, it can be said that the second zone is 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 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 <b> 1, an introduction space formed between the barrel casing 62 and the first screw 51 in which the powder raw material stirred by the powder bridge prevention device 3 through the hopper 2 and the introduction casing 4 is formed. 61. As shown in FIGS. 1 and 5, 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.

  In addition, a plurality of dispersion members 64 fixed to the inner surface of the transport pipe 63 are provided in the vicinity of the discharge port 63 a of the transport pipe 63 so as to protrude from the inner surface of the transport pipe 63 toward the internal space. As shown in FIG. 6, which is a cross-sectional view taken along the line B-B of FIG. 5, 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 view of the second screw 54 in FIGS. 5 and 7, in the position where the dispersion member 64 is provided in the second zone S <b> 2, 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 present 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 powder conveyance space 41 of the introduction casing 4, a plurality of linear members 31 are rotationally driven by the rotation drive device 32, and partial aggregation such as a bridge is suppressed in the powder raw material.

  Specifically, when a plurality of linear members 31 supported at both ends by a pair of disk members 34 are rotated, all the linear members 31 are rotated on a common rotation track. Will be. Further, the linear member 31 is a member having a small cross section so that its supporting form (for example, linear form) cannot be held unless both ends thereof are supported by the pair of disk members 34. Further, the linear member 31 has a circular cross section so that the surface area in contact with the surrounding powder raw material becomes small, and the frictional force generated by the contact with the powder raw material becomes small. The cross section has a smooth curved surface (that is, a circular cross section).

  Since the plurality of linear members 31 are configured in this way, even if each linear member 31 is rotated, the frictional force generated between the powder raw materials adjacent to each other on the inner and outer periphery of the rotation track is greatly increased. Reduced to Therefore, even if the plurality of linear members 31 are rotated, it is possible to suppress as much as possible that the powder raw material in the vicinity thereof moves together with the linear members 31. Therefore, it is possible to prevent the rotation of the plurality of linear members 31 from affecting the powder pressure of the surrounding powder raw material. It can also be said that such a linear member 31 is a member that is rotated without being affected by the powder pressure.

  On the other hand, the plurality of linear members 31 are rotated so as to cut (cut) the powder raw material on the rotation path. Therefore, agglomeration such as a bridge generated in the powder raw material is cut to prevent a bridge from being generated.

  By such an action of the powder bridge preventing device 3, as shown in FIG. 5, even if the powder raw material is at the material level L1 or at the material level L2 in the hopper 2, In the introduction casing 4, the bulk density of the powder raw material present at a level below the upper end height position of the rotation trajectory of the plurality of linear members 31 can be brought close to a constant (uniform) state.

  Therefore, the fluctuation of the powder pressure of the powder raw material can be suppressed while the stirring of the powder raw material is suppressed, and the bridge generated in the powder raw material can be prevented and is introduced into the first zone S1 of the barrel 6. The quantitative property of the powder raw material can be improved.

  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.

  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. 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. In particular, in the present embodiment, since the quantification of the powder raw material introduced into the first zone S1 of the barrel 6 is achieved by the powder bridge preventing device 3, the quantification of the bulk density of the powder raw material is achieved. Can be increased.

  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 present embodiment, the plurality of linear members 31 that rotate in the powder raw material in the introduction casing 4 are members having a small cross section (for example, a circular cross section). In addition, all the linear members 31 are configured to be rotated on one common rotating track. Therefore, even if the plurality of linear members 31 are rotated, the frictional force generated between the powder raw materials adjacent to each other on the inner and outer circumferences of the rotation track is greatly reduced. Therefore, even if the plurality of linear members 31 are rotated, the powder raw material in the vicinity of the surroundings can be suppressed as much as possible together with the linear members 31, and the rotation of the plurality of linear members 31 can reduce the surrounding powder. It is possible to prevent the powder pressure of the body material from being affected. On the other hand, the plurality of linear members 31 are rotated so as to cut (cut) the powder raw material on the rotation path. Therefore, it is possible to suppress the occurrence of aggregation such as a bridge in the powder raw material. Therefore, the fluctuation of the powder pressure of the powder raw material can be suppressed while the stirring of the powder raw material is suppressed, and the bridge generated in the powder raw material can be prevented and is introduced into the first zone S1 of the barrel 6. The quantitative property of the powder raw material can be improved.

  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.

  In the above description, the case where the linear member 31 has a circular cross section has been described as an example. However, any cross-sectional shape that can reduce friction with the surrounding powder raw material may be used. The part which touches the inner peripheral side should just be formed in the curved surface. The linear member 31 preferably has a circular cross section from the viewpoint of minimizing the surface area in contact with the powder raw material.

  Moreover, although the case where the support form of the linear member 31 between the pair of disk members 34 is linear is taken as an example, the support form may be a curved form or a mixed form of a straight line and a curved line. However, from the viewpoint of reducing the surface area in contact with the powder raw material, the support form is preferably linear.

  Moreover, you may employ | adopt as the linear member 31 a member supported in the state to which tension | tensile_strength was provided by a pair of disk member 34, such as a wire-shaped member and a piano wire.

  Further, the number of the linear members 31 may be set so that the powder raw material can pass between the adjacent linear members 31 at a constant conveying speed in consideration of the rotation speed and the characteristics of the powder raw material. preferable.

  For example, in the case where a raw material that is likely to generate static electricity due to friction is used as the powder raw material, the powder raw material and the linear shape can be obtained by applying the powder bridge prevention device 3 of the present embodiment. The friction with the member 31 can be reduced, the generation of static electricity can be suppressed, and bridge formation and the like can be suppressed.

  Moreover, although each linear member 31 demonstrated as an example the case where it arrange | positions in the direction (namely, horizontal direction) orthogonal to the conveyance direction (namely, up-down direction) of a powder raw material, at least powder The linear member should just be arrange | positioned in the direction which cross | intersects the conveyance direction of a raw material.

  Further, the disk member 34 that supports the plurality of linear members 31 may not be disk-shaped, and may be a plate-shaped member having another shape such as a polygonal shape.

  In addition, the hopper 2, the introduction casing 4, the first zone S <b> 1 of the barrel 6, etc., other than the powder bridge prevention device 3, can take forms other than those described above.

  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.

  Further, the case where the powder bridge prevention device 3 is applied to the powder supply device 1 has been described as an example. However, the present invention is applicable to any device having a powder conveyance path that requires quantitative conveyance. The powder bridging prevention device can be applied.

  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 31 Linear member 32 Rotation drive device 33 Disk member 34 Rotation drive shaft 51 First screw 54 Second screw 62 Barrel casing 63 Conveying pipe 64 Dispersing member

Claims (5)

A powder bridging prevention device that is arranged in a powder conveyance path surrounded by a casing and prevents bridging that occurs in a powder raw material that passes through the powder conveyance path,
A plurality of linear members arranged in a direction intersecting the conveying direction of the powder raw material in the powder conveying path;
A pair of plate-like members that are arranged so as to face each other, support both ends of the plurality of linear members, and hold the support form of the linear members;
A rotation drive device having a rotation drive shaft fixed to the pair of plate-like members and rotating a plurality of linear members via the plate-like members,
A powder bridge preventing device in which a plurality of linear members are rotated in a powder raw material so that all other linear members are rotated on a rotation path of one linear member.   The cross-sectional shape of the plurality of linear members is the powder bridge prevention device according to claim 1, wherein portions that are in contact with the outer peripheral side and the inner peripheral side of the rotating track are configured by curved surfaces.   The powder bridge preventing device according to claim 2, wherein the plurality of linear members have a circular cross section.   The powder bridge preventing device according to any one of claims 1 to 3, wherein the plurality of linear members have a linear support form between the pair of plate-shaped members. A powder supply device for conveying and supplying a powder raw material using a screw,
A hopper into which the powder raw material is introduced;
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 first raw material into which the powder raw material is introduced from the hopper, and the powder raw material conveyed from the first zone is compressed by rotating the screw, and the powder raw material is A barrel having a second zone discharged from the outlet;
The powder bridge prevention device according to any one of claims 1 to 4, which is disposed between the hopper and the first zone of the barrel,
A powder supply device in which a powder raw material introduced into a hopper is introduced into a first zone of a barrel through a powder bridge prevention device.

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