JP5286118B2 - Reduction device - Google Patents

Description

  The present invention relates to a reduction device for collecting a small amount of sample from a powdery or granular material, and more particularly to a reduction device for collecting a small amount of sample from a large number of positions distributed throughout a large amount of material. .

  Analyzing the composition and quality of a powdered or granular material is a weight for the purpose of ensuring the safety of transactions, and is also necessary for formulating a plan for processing and processing the material. In general, a powdery or granular material is rarely uniform in composition or the like when a large amount of material is accumulated. For this reason, in order to grasp | ascertain the whole composition, it is necessary to extract | collect the sample which represents the whole, and a reduction apparatus is used.

  In particular, recycled materials containing precious metals, for example, recycling materials for automobile exhaust gas treatment equipment that uses platinum as a catalyst, and recycled materials such as electronic equipment substrates that use gold, etc. It is necessary to accurately grasp the content. For this reason, samples collected for analysis are required to accurately represent the entire sample.

Several types of reduction devices have been proposed, such as those described in Patent Document 1 and Patent Document 2.
In the device described in Patent Document 1, the powdery material conveyed through the pipeline crosses the rotation region of the impeller. The impeller is provided with a sample collection blade in a region of a predetermined central angle, and a sample of the powder is collected every time the impeller rotates and passes through a flow area where the powder flows down. .
Further, the reducer described in Patent Document 2 is configured to alternately arrange grooves having different flow directions in two directions, and supply powder from above to divide the powder according to the flow direction of the grooves. . For example, the grooves are arranged in an annular shape, and the powder is allowed to slide along the circumferential surface of the cone so that the powder flows down on the grooves.

JP 62-261939 A JP2003-172676

  In the conventional reduction apparatus as described above, it takes a lot of time to perform a lot of sampling from a large amount of material, and the efficiency is extremely deteriorated. On the other hand, if the number of times of sampling is reduced, a deviation occurs between the composition of the entire material and the composition of the collected sample, and the accuracy of the analysis is deteriorated. In particular, high precision is required for sampling of powders containing noble metals such as platinum, and there is a need for a reduction device that can efficiently collect a sample representative of the whole.

  The present invention has been made in view of the above circumstances, and a purpose thereof is a reduction apparatus that can efficiently collect a sample that accurately represents the entire material from a large amount of powder material. Is to provide.

In order to solve the above-mentioned problem, the invention according to claim 1 is a cone having an axisymmetric shape with respect to a vertical axis, having a sharp upper end and a lower diameter, and an upper portion of the top of the cone. And a supply unit for dropping the powder from the supply unit, the powder supplied from the supply unit is slid along the circumferential surface of the cone, and is distributed and slid down in the circumferential direction at the lower end of the cone. A shrinking device for collecting a part of powder, wherein the supply section has a circular cross section and is supported so that a central axis coincides with a vertical axis of the cone, from above. A supply tank into which powder is charged, and a perforated plate that is horizontally supported in the supply tank and is provided so that a large number of small holes through which the powder supplied from above passes are distributed almost uniformly. The supply tank provided close to the upper side of the perforated plate so as to level the powder on the perforated plate A rotary wing body swiveling around the central axis, and a circular cross section that is supported so that the vertical axis of the cone coincides with the central axis, and drops the powder that has passed through the perforated plate onto the cone. A reduction device having a drop guide tube is provided.

  In this reduction device, the powder charged in the supply tank falls on the perforated plate, and once it is given resistance to fall down from the perforated plate, the powder is put on the perforated plate by the rotating blades. Leveled in the circumferential direction. Thereby, the powder passes through the perforated plate in a state where the circumferential deviation is reduced and falls onto the cone. And the powder which fell on the cone falls uniformly on the circumferential surface of the cone in the circumferential direction. Therefore, by collecting the powder that slides down to the region of the predetermined central angle at the lower end of the cone, an accurate amount of sample can be continuously collected in small amounts from many positions.

  The invention according to claim 2 is the contraction device according to claim 1, further comprising a supply pipe that is supported so that a center axis coincides with the supply tank, and is inserted into the supply tank from above. The rotary wing body is fixed to the lower end of the supply pipe and is driven to rotate around the central axis of the supply pipe together with the supply pipe, and the powder flows from an opening provided in the supply pipe. It shall be supplied to the upper side of the perforated plate in the supply tank.

  By supplying the powder from the rotating supply pipe into the supply tank, the powder is dispersed almost evenly in the circumferential direction from the center of the supply tank. As a result, it is possible to supply the powder that passes through the perforated plate and falls in a state that is closer to the circumferential direction.

  According to a third aspect of the present invention, in the contracting device according to the second aspect, the powder falling in the supply pipe is radially supported by the lower part of the supply pipe so that the supply pipe and the central axis coincide with each other. It shall have a cone which disperse | distributes and discharge | releases in the said supply tank from the said opening part.

  In this reduction device, the powder falls from the supply pipe onto the cone, and is fed into the supply tank so as to diffuse to the periphery of the cone. Therefore, the powder is supplied on the perforated plate of the supply tank in a more nearly uniform state.

  The invention according to claim 4 is the shrinking device according to claim 1, claim 2 or claim 3, wherein the amount of the powder supplied to the supply tank per predetermined time is determined by the perforated plate. The amount is adjusted to be smaller than the amount that can pass per predetermined time.

  In this reduction device, the powder supplied to the supply tank does not accumulate and stay on the perforated plate, and falls while being leveled by the rotating blades, thereby reducing fluctuations in the amount of fall. In other words, if the amount of powder supplied to the supply tank is controlled to be constant, the amount of powder falling on the cone will not change, and a certain amount of powder will continue to fall on the cone. Can do.

  The invention according to claim 5 is the reduction device according to any one of claims 1 to 4, wherein a lower end of the drop guide tube is cut horizontally, and the drop guide tube is vertically The size of the annular gap between the lower end of the drop guide tube and the peripheral surface of the cone is adjusted by moving in the direction.

  In this reduction apparatus, even when the amount of powder supplied to the supply tank is set to be large, it is avoided by adjusting the gap that the powder stays in the upper part of the gap between the drop guide tube and the cone. be able to. In addition, when the amount of powder supplied to the supply tank is set to be small, the gap between the drop guide tube and the cone is brought close to the upper portion so that the powder does not stay on the top of the cone, along the drop guide tube. The powder can be accurately dropped.

  The invention according to claim 6 is the reduction apparatus according to any one of claims 1 to 5, wherein the cone has an upper end at a position lower than the apex and a partition wall continuous downward is circumferential. And the powder is divided between a plurality of partition walls and slid down.

  In this reduction device, the powder falling on the cone from the supply pipe and sliding down the circumferential surface of the cone is distributed almost evenly in the circumferential direction for each region partitioned by the partition wall. Divided. And it falls from the lower end part of a cone for every divided area. In general, when the distance of sliding down the circumferential surface of the cone increases, the amount of powder dispersed in the circumferential direction decreases. When the sliding amount decreases, the distribution in the circumferential direction tends to become non-uniform due to the influence of the friction of the sliding surface. However, in the reduction device of the present invention, the powder sliding down on the cone is divided according to the central angle between the partition walls at a position where the powder is uniformly distributed in the circumferential direction, and the partition wall is maintained while maintaining this division amount. Fall to the lower end. Therefore, an accurate amount of sample can be collected at the lower end.

  The invention according to claim 7 is the shrinking device according to claim 6, wherein a lid plate is provided so as to be joined to the top of the partition wall and to face the peripheral surface of the cone with a gap. Shall.

  Part of the powder sliding down the peripheral surface of the cone rises easily due to the influence of friction or the like, and is likely to be scattered. And there exists a possibility that it may mix with the powder of the adjacent area | region divided with the partition wall. In the reduction apparatus of the present invention, the powder can be prevented from scattering from the region partitioned by the partition wall, and the sample can be accurately collected by preventing mixing with the adjacent region. .

  As described above, in the reduction device of the present invention, the powder can be slid down in a state of being uniformly distributed in the circumferential direction on the circumferential surface of the cone, and the entire powder slid down on the circumferential surface of the cone. A small amount of powder can be collected accurately and efficiently from widely distributed positions.

It is a schematic side view of the reduction apparatus which is one Embodiment of this invention. It is a schematic sectional drawing of the powder supply part used with the reduction apparatus shown in FIG. It is a schematic plan view which shows the rotary blade body and perforated board of the powder supply part shown in FIG. It is a schematic sectional drawing which shows the powder sliding part and upper part of a sampling part which are used with the reduction apparatus shown in FIG. It is a schematic plan view of the powder sliding part shown in FIG. It is a schematic sectional drawing of the sampling part used with the reduction apparatus shown in FIG. It is a schematic plan view of the upper table used in the sampling part shown in FIG. It is a schematic plan view of the lower table used in the sampling part shown in FIG. It is a schematic sectional drawing which shows the discharge part used with the reduction apparatus shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view of a reduction apparatus according to an embodiment of the present invention.
This reduction device includes a powder sliding part 1 where powder slides down on the peripheral surface of a cone, a powder supply part 2 for dropping powder from above the powder sliding part 1, and the powder sliding part A sampling unit 3 that collects part of the powder that has fallen off the peripheral surface of the cone in the unit 1 and a discharge unit 4 that separates and discharges the powder collected by the sampling unit 3 from the powder that was not collected. These are supported by the support frame 5.

FIG. 2 is a schematic cross-sectional view of the powder supply unit 2.
The powder supply unit 2 includes a supply tank 21 having a circular cross section, a supply pipe 22 for supplying powder to the supply tank 21, a cone 23 fixed to the lower end of the supply pipe 22, A rotary wing body 24, a drop guide tube 25 connected to the lower portion of the supply tank 21, and a perforated plate 27 supported horizontally on the lower side of the rotary wing body are provided.

  The supply tank 21 is fixedly supported by the support frame 5, and the diameter of the lower part is gradually reduced in a funnel shape from the middle of the overall height. And it becomes the cylindrical connection part 21a by which the lower end part was diameter-reduced, and the fall induction pipe | tube 25 is connected to this connection part. The supply tank 21 is provided with an upper lid 26 at the top, and an opening is provided at the center position of the upper lid, and a support portion 61 of the supply pipe 22 is attached. The support portion 61 of the supply pipe 22 is provided with a bearing 62, and supports the supply pipe 22 inserted through the opening of the upper lid 26 via the bearing 62 so as to be rotatable around the axis of the supply pipe. It has become.

The supply pipe 22 includes an outer pipe 22a and an inner pipe 22b fixed to each other, and a drive transmission gear 63 fixed to the outer pipe 22a is connected to a drive gear 65 from a motor 64 fixedly supported on the support frame 5. The rotational driving force is transmitted via a speed reducer (not shown). The upper part of the supply pipe 22 is joined to a powder receiving pipe 66 to receive the powder sent out from the powder transfer pipe 67 and guide it into the supply tank 21 through the supply pipe 22.
The powder receiving tube 66 is joined to the supply tube 22 and rotates around the axis thereof. A slidable seal member is provided between the powder receiving tube 66 and the conveying tube 67 fixedly supported. Yes.

  The inner pipe 22b of the supply pipe 22 extends downward and has a lower end opened. Further, the lower end of the inner tube 22b is provided with two protrusions 22c downward so as to extend the peripheral surface from the circumferentially opposed position, and the cone 23 and the rotary wing body 24 are supported by these protrusions 22c. Has been. And it rotates with the supply pipe | tube 22 around the axis line of this supply pipe | tube.

The cone 23 is supported so that the central axis thereof coincides with the central axis of the supply pipe 22 with the apex facing upward, and the powder falling inside the supply pipe 22 is discharged from the opening at the lower end. It strikes the circumference of the cone and is distributed around it.
The rotary wing body 24 is provided below the position where the powder dispersed by hitting the cone 23 is supplied into the supply tank 21, and a plurality of wings project in the radial direction from the center. . Each blade is inclined in the rotational direction and conveys the supplied powder so as to be uniform in the circumferential direction.

A perforated plate 27 is horizontally supported by a funnel-shaped portion where the inner diameter of the supply tank 21 is reduced below the rotary blade body 24 and is close to the rotating rotary blade body 24. As shown in FIG. 3, the perforated plate 27 is provided with small holes through which the powder can pass almost evenly. These small holes can appropriately set the inner diameter according to the particle diameter of the powder. For example, the inner diameter can be about 2 to 10 mm, preferably about 3 to 7 mm. In this embodiment, it is 5 mm.
The rotational speed of the rotor blade 24 is such that the diameter of the small holes, the amount of powder supplied, It can be appropriately set in consideration of the properties and the like, and can be set to 0.5 to 5 times / second, for example, and preferably 1 to 3 times / second.

  The drop guide tube 25 is fitted on the outside of the connection portion 21a of the supply tank 21 so as to be movable relative to the vertical direction. And then. While being supported by the supply tank 21 via the bolt 28, the position in the height direction can be changed by adjusting the bolt 28, and the annular gap generated between the lower edge and the cone 11 can be adjusted. It is possible.

FIG. 4 is a schematic cross-sectional view showing the upper part of the powder sliding part 1 and the sampling part 3 provided below the powder supply part 2.
The powder sliding portion 1 includes a cone 11 supported on the top of a support column 12 fixed to a support frame 5, and the powder falling from the drop guide tube 25 of the powder supply unit 2 is the cone. 11 on the peripheral surface. The cone 11 has a substantially conical shape and is supported so that the drop guide tube 25 and the central axis coincide with each other. Since the powder is uniformly dropped in the circumferential direction from the drop guide tube 25, the powder dispersed and dropped from the apex of the cone 11 in all directions is substantially uniform in the circumferential direction.

  A step 11 a is provided at a position that is a predetermined distance downward from the apex of the cone 11. The step 11a is provided such that the inclined surface on the downstream side of the step is below the extended line of the inclined surface on the upstream side of the step. Therefore, the powder sliding down the upstream side of the step 11a jumps away from the inclined surface once on the downstream side of the step, and then falls onto the inclined surface below the step and further slides down. Thereby, the friction which acts on the powder sliding down the inclined surface of the cone 11 is reduced, and the distribution in the circumferential direction of the powder sliding down on the inclined surface due to the influence of friction is reduced. .

Further, a plurality of partition walls 13 are provided from the downstream side of the position where the step of the cone 11 is provided to the lower end portion, and the peripheral surface of the cone 11 is distributed in the circumferential direction as shown in a plan view in FIG. The powder that slides down is equally divided in the circumferential direction. That is, the tops of the plurality of partition walls 13 have the same height, and the tops are equally spaced in the circumferential direction. And the powder divided | segmented between each partition wall is restrict | limited to a predetermined width | variety, and is made to flow down so that it may not spread in the circumferential direction.
In this embodiment, the peripheral surface of the cone 11 is equally divided into 16 by the partition wall 13 in the circumferential direction. However, the number of equally dividing portions is not limited to the 16 equal parts, and is appropriately selected. be able to.

  A cover plate 14 is provided over the entire circumference of the upper portion of the partition wall 13 so as to oppose the peripheral surface of the cone 11, and the powder flow channel between the partition walls is closed in a tubular shape. Yes. As a result, even if the powder flowing down rises and scatters, it is prevented from mixing with the powder flowing down in the adjacent area partitioned by the partition wall.

The powder flowing down between the partition walls 13 is discharged from the lower end portion 11b of the cone 11 and falls, and a sampling chute 33 provided on the sampling unit 3 to rotate and move the discharged powder. It is to receive.
The cover 15 provided so as to cover the outside of the cone 11 is supported on an upper table 31 (described later) whose lower end rotates, and rotates together with the upper table 31. The upper portion of the cover 15 is supported by a drop guide tube 25 fixedly supported via an upper support rotating body 16 and a bearing 17.

FIG. 6 is a schematic cross-sectional view of the sampling unit 3 provided on the lower side of the powder sliding portion 1.
The sampling unit 3 includes an upper table 31 that is rotationally driven around a vertical central axis of the cone 11 and a lower table 32 that is below the upper table 31 and rotates together with the upper table 31. The upper table 31 is provided with a plurality of sampling chutes 33 and discharge chutes 34 alternately along the outer periphery as shown in FIG. The sampling chute 33 and the discharge chute 34 move as the upper table 31 rotates, and divide the powder falling through the position where the powder continuously falls from the lower end of the cone 11. It is to be accepted. And it sends out to the lower table 32 through the conduit | pipe 35 connected to the lower part.

  A partition 36 is provided between the collection chute 33 and the discharge chute 34 so that the powder is introduced into either the collection chute or the discharge chute. These partition portions 36 are provided in the radial direction of the rotating upper table 31 and have edges that are pointed upward. The central angle α formed by the two partition portions 36 provided on both sides of the sampling chute 33 and the central angle β formed by the partition portions 36 provided on both sides of the discharge chute 34 are set to have a predetermined ratio. Yes. As a result, when passing through the position where the powder continuously falls from the lower end of the cone 11, the powder is accurately divided into the ratio of the central angles by the partitioning portion 36 having a sharp tip edge, and the sampling chute 33 and the discharge chute 34 respectively.

In the present embodiment, eight collection chutes 33 and eight discharge chutes 34 are provided, the central angle α of the range flowing down to the collection chutes 33 is set to 9 °, and the central angle of the range flowing down to the discharge chute 34 is set. β is set to 36 °.
In addition, the number of the collection chutes 33 and the discharge chutes 34, the respective central angles, and the ratio of these central angles are not limited to the above values, and can be set as appropriate.

  In the lower table 32, as shown in FIG. 8, an outer discharge port 37 is arranged along the outer peripheral portion, and an inner discharge port 38 is arranged inside thereof. The outer discharge ports 37 are provided with the same number as the sum of the collection chutes 33 and the discharge chutes 34, and the inner discharge ports 38 are provided with the same number as the collection chutes 33. A first conduit 35 a connected to the lower portion of the discharge chute 34 is connected to the outer discharge port 37, and the powder received by the discharge chute 34 is guided to the outer discharge port 37. Further, the second conduit 35b connected to the lower portion of the sampling chute 33 can select and connect either the outer discharge port 37 or the inner discharge port 38, and the connection is changed as appropriate. It has become something that can be.

  The upper table 31 is attached to the support column 12 via a bearing 71 and is supported by a rotation base 72 that can rotate about the central axis of the support column 12. An internal gear 73 is fixed to the rotation base 72. A drive gear 74 is meshed with the internal gear 73, and a rotational driving force is transmitted from the drive motor 75 fixed to the support column 12 to the drive gear 74 and the internal gear 73 to drive the upper table 31 to rotate. It has become.

  The lower table 32 is supported by a base 76 of the support column 12 via a bearing 77 so as to be rotatable around the central axis of the support column 12. The lower table 32 is supported by a sampling chute 33, a discharge chute 34 and a conduit 35 of the upper table 31. It is connected. As a result, the rotational driving force is transmitted and rotates together with the upper table.

  The rotation speeds of the upper table 31 and the lower table can be appropriately determined, preferably set to about 1 to 10 times / minute, more preferably 3 to 7 times / minute. When the rotation speed of the upper table is high, powder sampling can be performed in a large number, but the powder scattering increases when the powder falling from the cone 11 is collected. For this reason, it is desirable to determine in consideration of the number of divided samples and the sampling amount error due to scattering. In this embodiment, it is set to 5 times / minute.

FIG. 9 is a schematic cross-sectional view showing the discharge unit 4 provided below the sampling unit 3.
The discharge unit 4 includes an outer hopper 41 supported below the outer discharge port 37 and an inner hopper 42 supported below the inner discharge port 38. The outer peripheral portion of the outer hopper 41 is outside the outer discharge port 37 arranged in an annular shape, and the powder guided to the outer discharge port 37 is dropped. Further, the outer peripheral portion of the inner hopper 42 is outside the inner discharge ports 38 arranged in a ring and inside the outer discharge ports 37, and the powder guided to the inner discharge ports 38 is dropped onto the outer hopper 37. It is dropped so as not to mix with the powder. The powder dropped on the inner hopper 38 is taken out by a collection tube 43 that penetrates the outer wall portion of the outer hopper 41. Further, the powder dropped on the outer hopper 41 is sent out to the discharge pipe 44.

In such a reduction device, the powder dropped in the supply pipe 22 from the powder receiving pipe 66 hits the conical surface of the conical body 23 supported by the lower end of the supply pipe 22 and is dispersed to the surroundings to supply the supply tank 22. Supplied in. In the supply tank, it passes through the perforated plate 27 while being leveled in the circumferential direction by the rotary blade body 24, and is distributed almost evenly in the circumferential direction and falls onto the cone 11 from the drop guide tube 25.
Since the vertical axis of the cone 11 coincides with the central axis of the drop guide tube 25, the powder dropped on the peripheral surface of the cone 11 is distributed almost evenly in the circumferential direction and exceeds the step 11a. And flows down between the partition walls 13. The tops of the partition walls 13 are equally spaced in the circumferential direction, and the powder that slides evenly in the circumferential direction is evenly divided and reaches the lower end of the cone 11.

  The powder continuously falling from the lower end portion of the cone 11 is received by a collecting chute 33 or a discharge chute 34 provided on the rotating upper table 31 and dropped into the outer hopper or the inner hopper via a conduit 35. The powder dropped on the inner hopper 42 is taken out from the collection tube 43 as a sample. Further, the powder dropped on the outer hopper 41 is discharged from the discharge pipe 44.

  In the sampling unit 3 that collects a sample as described above, the second conduit 35b connected to the collection chute 33 can select and connect either the outer discharge port 37 or the inner discharge port 38. Therefore, it is possible to select whether the received powder is dropped on the outer hopper or the inner hopper for each of the plurality of collection chutes 35b. Thereby, the amount of sample to be collected can be changed.

  For example, when all of the connected second conduits are connected to the inner discharge port 38 for the sampling chute 33 provided with eight in the present embodiment, all of the powder taken in the eight sampling chutes is used as a sample. According to the ratio of the central angle with the discharge chute 34, 1/5 of the total amount is sampled. The collected powder is divided into 16 parts and slides around the peripheral surface of the cone 11, and eight collection chutes each sample five times per minute. Therefore, sampling is performed from 640 different powders supplied in one minute, and the accuracy is high as a sample representing the entire amount.

When reducing the amount of sample, for example, four of the second conduits are connected to the inner discharge port 38, and the other second conduit 35 is connected to the outer discharge port 37. In such a state, the powder taken into the four collecting chutes is dropped into the inner hopper and collected. That is, the central angle occupied by these four sampling chutes 34 is 36 °, and 1/10 of the total amount is sampled. Then, four sampling chutes from each of the 16 divided powders sample five times each minute, and 320 samples are sampled from the powder supplied per minute.
Similarly, when two of the second conduits 35b are connected to the inner outlet 38 and the other second conduit 35b is connected to the outer outlet 37, 1/20 of the total amount is collected. Then, two sampling chutes from each of the 16 divided powders sample each 5 times per minute, and are sampled at 160 locations from the powder supplied per minute.

1: powder sliding part, 2: powder supply part, 3: sampling part, 4: discharge part, 5: support frame,
11: Cone, 12: Support column, 13: Partition wall, 14: Cover plate, 15: Cover, 16: Upper support rotating body, 17: Bearing,
21: Supply tank, 22: Supply pipe, 22a: Outer pipe of the supply pipe, 22b: Inner pipe of the supply pipe, 23: Conical body, 24: Rotating wing body, 25: Falling guide pipe, 26: Upper lid, 27: Hole Perforated board 28: Bolt,
31: upper table, 32: lower table, 33: sampling chute, 34: discharge chute, 35a: first conduit, 35b: second conduit, 36: partitioning part, 37: outer outlet, 38: inner outlet ,
41: outer hopper, 42: inner hopper, 43: sampling tube, 44: discharge tube,
61: Support part of supply pipe, 62: Bearing, 63: Drive transmission gear, 64: Motor, 65: Drive gear, 66: Powder receiving pipe, 67: Conveying pipe,
71: Bearing, 72: Rotating base, 73: Internal gear, 74: Drive gear, 75: Drive motor, 76: Base of support column, 77: Bearing

Claims (7)

A cone having an axisymmetric shape with respect to a vertical axis, a sharp upper end and a lower diameter,
A supply unit for dropping powder from above the top of the cone,
A reduction device that slides the powder supplied from the supply unit along the peripheral surface of the cone and collects a part of the powder that is distributed and slides in the circumferential direction at the lower end of the cone. There,
The supply unit
A feed tank in which the cross section is circular and supported so that the center axis coincides with the vertical axis of the cone, and powder is charged from above,
A perforated plate that is horizontally supported in the supply tank and provided so that a large number of small holes that allow powder supplied from above to pass therethrough are distributed substantially uniformly;
A rotary wing provided near the upper side of the perforated plate and swiveling around the central axis of the supply tank so as to level the powder on the perforated plate;
A fall-inducing tube having a circular cross section that is supported so that the vertical axis of the cone and the center axis coincide with each other and that drops the powder that has passed through the perforated plate onto the cone. Feature reduction device. The supply tank is supported so that the central axis coincides with the supply tank, and has a supply pipe inserted into the supply tank from above,
The rotary wing body is fixed to the lower end portion of the supply pipe and is rotated around the central axis of the supply pipe together with the supply pipe.
The said powder is supplied to the upper side of the said perforated board in the said supply tank from the opening provided in the said supply pipe | tube, The reduction apparatus of Claim 1 characterized by the above-mentioned.   It has a cone that is supported at the lower part of the supply pipe so that the central axis coincides with the supply pipe, and the powder falling in the supply pipe is radially dispersed and discharged from the opening into the supply tank. The reduction device according to claim 2.   The amount of the powder supplied to the supply tank per predetermined time is adjusted to be smaller than the amount that can pass through the perforated plate per predetermined time. The reduction device according to claim 2 or claim 3. The lower end of the drop guide tube is cut horizontally,
2. The drop guide tube according to claim 1, wherein the drop guide tube moves in a vertical direction to adjust a size of an annular gap between a lower end of the drop guide tube and a peripheral surface of the cone. 5. The reduction device according to any one of 4 to 4.   The cone is provided with a plurality of partition walls in the circumferential direction having an upper end at a position lower than the apex and continuing downward, and the powder is divided between the plurality of partition walls to slide down. A reduction device according to any one of claims 1 to 5.   The reduction device according to claim 6, wherein a lid plate is provided so as to be joined to the top portion of the partition wall and to face the peripheral surface of the cone with a gap.

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