JP7541967B2 - Powder and granular material supply device - Google Patents

Description

The present invention relates to a powder/granular material supplying device, and in particular to a powder/granular material supplying device suitable for supplying a fixed amount of powder/granular material.

Conventionally, this type of powdered material supplying device is as shown in Patent Document 1. The granular material supplying device in Patent Document 1 includes a hopper into which the powdered material is fed, a discharge section that discharges the powdered material, a chute that guides the powdered material that has descended from the hopper to the discharge section, and an agitating section in which an agitating member rotates around an axial center section that protrudes obliquely upward from the lower part inside the chute.

JP 2013-139333 A

However, in the powder supplying device of Patent Document 1, the powder in the chute is pushed up by the stirring member and compressed against the inner wall surface of the hopper, which reduces the flowability of the powder when the stirring member is rotating at a low speed. This causes a problem in that with powder with poor flow characteristics, bridges or ratholes can form starting from points of high powder pressure in the hopper or chute.

The present invention aims to solve the above problems and provide a powder/granular material supplying device that can prevent the occurrence of bridges or ratholes in a hopper or chute.

In order to solve the above problems, the powdered material supplying device of the present invention is a powdered material supplying device including a hopper into which powdered material is introduced, a discharge section for discharging the powdered material, a chute for guiding the powdered material lowered from the hopper to the discharge section, and an agitating section provided inside the chute for agitating the powdered material lowered from the hopper, the agitating section having a first agitating member for agitating the powdered material by pushing it upward, and a second agitating member provided above the first agitating member for agitating the powdered material by pushing it downward.

In the above configuration, the powder particles pushed up by the first stirring member can be stirred by being pushed down by the second stirring member.

In the powder supplying device of the present invention, the second stirring member is arranged coaxially opposite the first stirring member.

In the above configuration, the powder in the chute can be stirred between the first and second stirring members.

The powder/granular material supplying device of the present invention has a slope on at least a portion of the surface of the second stirring member that faces the first stirring member.

In the above configuration, the second stirring member can stir the powder in the chute by pushing it down.

The powder/granular material supplying device of the present invention has a longitudinal end of the second stirring member curved toward the first stirring member.

The above configuration ensures that the powder near the inner wall surface of the chute is stirred reliably.

The powder and granular material supplying device of the present invention is provided with a branched stirring member formed by branching off from the longitudinal end of the second stirring member, and the branched stirring member is formed to fit along the inner wall surface of the chute.

The above configuration ensures that the powder near the inner wall surface of the chute is stirred reliably.

The powder supplying device of the present invention has a shape in which the longitudinal direction of the second stirring member tapers toward the tip.

The above configuration reduces the rotational resistance of the second stirring member.

The powder/granular material supplying device of the present invention has an inclined surface formed on the longitudinal end face of the second stirring member.

In the above configuration, the second stirring member can stir the powder in the chute by pushing it down.

The powder/granular material supplying device of the present invention is configured so that the phase between the first stirring member and the second stirring member can be changed according to the characteristics of the powder/granular material being lowered into the chute.

The above configuration allows for sufficient mixing of various powders and granular materials with different characteristics.

The powder supplying device of the present invention has different rotation periods for the first stirring member and the second stirring member.

The above configuration allows the powder and granular material in the chute to be thoroughly mixed.

In the powder supplying device of the present invention, the first stirring member and the second stirring member rotate in opposite directions.

The above configuration allows the powder and granular material in the chute to be thoroughly mixed.

In the powder supplying device of the present invention, the first stirring member and the second stirring member rotate about an axial center portion that protrudes obliquely upward from the lower portion inside the chute.

The above configuration allows the powder and granular material in the chute to be thoroughly mixed.

The powder supplying device of the present invention is such that at least one of the powder contact surfaces of the hopper, the discharge section, the chute, and the mixing section is subjected to a surface treatment that reduces the coefficient of friction with the powder.

The above configuration can improve the fluidity of the powder near the inner wall surface of the device.

According to the powder/granular material supplying device of the present invention, the powder/granular material pushed up by the first agitating member is pushed down by the second agitating member, which eliminates the compaction of the powder/granular material on the inner wall of the hopper caused by the first agitating member pushing up the powder/granular material, and improves the fluidity of the powder/granular material during low-speed rotation of the agitating member, which had been reduced by the compaction of the powder/granular material. This makes it possible to prevent bridges or ratholes from occurring in the hopper or chute.

1 is a perspective view of a powder/granular material supplying device according to a first embodiment of the present invention; FIG. FIG. FIG. 2 is a partially cutaway vertical sectional side view of the powder/granular material supplying device. FIG. 1A is a diagram showing the distribution of pressure due to powder and granular materials in a hopper and a chute of a conventional powder and granular material supplying device, and FIG. 1B is a diagram showing the distribution of pressure due to powder and granular materials in a hopper and a chute of a powder and granular material supplying device according to a first embodiment of the present invention. 1A is a bottom view of a second agitating member of a powder/granular material supplying device according to a first embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line A-A of FIG. 1A, FIG. 1C is a plan view of a first agitating member of the powder/granular material supplying device, and FIG. 1D is a cross-sectional view taken along line B-B of FIG. FIG. 6 is a perspective view of a powder/granular material supplying device according to a second embodiment of the present invention. FIG. 11 is a perspective view of a powder/granular material supplying device according to a third embodiment of the present invention. FIG. 10 is a perspective view of a powder/granular material supplying device according to a fourth embodiment of the present invention. FIG. FIG. FIG. 2 is a partially cutaway vertical sectional side view of the powder/granular material supplying device. FIG. 4 is a perspective view of a second agitating member of the powder/granular material supplying device. FIG. 13 is a partially cutaway vertical sectional side view of a powder or granular material supplying device according to a fifth embodiment of the present invention. FIG. 13 is a partially cutaway vertical sectional side view of a powder or granular material supplying device according to a sixth embodiment of the present invention.

The powdered material supplying device 10 according to the present invention will be described. In the following description, the direction in which the powdered material is discharged from the discharge section 12 is defined as the front of the powdered material supplying device 10.

1 to 4, the powdered material supplying device 10 includes a hopper 11 into which the powdered material is fed, a discharge section 12 that discharges the powdered material, a chute 13 that guides the powdered material that is lowered from the hopper 11 to the discharge section 12, an agitating section 14 that is provided inside the chute 13 and agitates the powdered material that is lowered from the hopper 11, a weighing section 15 that carries these components, and a control section (not shown). In the powdered material supplying device 10, the hopper 11, the discharge section 12, the chute 13, and the agitating section 14 are placed on the weighing section 15, and the combined weight of these components and the powdered material is measured by the weighing section 15. The control section (not shown) controls the rotation speed of the screw 12d of the discharge section 12 so that the weight of the powdered material discharged per hour is constant, or so that the weight of the powdered material discharged in one go is constant.

The hopper 11 is a cylindrical member that is roughly circular in plan view. The hopper 11 is formed with the same roughly circular cross-sectional shape in the vertical direction.

The chute 13 is a cylindrical member that is provided below the hopper 11 and has a generally elliptical shape in plan view. The side wall portion 13a of the chute 13 is formed in a cross-sectional shape that is larger on the lower side than on the upper side. When viewed from the front, the left and right side wall portions 13a of the chute 13 extend downward. When viewed from the side, the side wall portions 13a of the front and rear ends of the chute 13 are formed straight in the vertical direction. The left and right side wall portions 13a of the chute 13 and the front and rear end side wall portions 13a are formed in a shape that is gently connected in the circumferential and vertical directions.

The chute 13 has an inclined surface 13b formed on its lower rear side. The inclined surface 13b is formed so as to be inclined from the front side of the chute 13 to the rear side diagonally upward. The inclined surface 13b is formed in a substantially circular shape. The conical wall portion 13c of the chute 13 is formed in a shape that spreads forward, left and right, and upward from the inclined surface 13b in a truncated cone shape.

The discharge section 12 includes a discharge tube 12a and a screw casing 12b that extend in the front-rear direction, and a discharge outlet tube 12c that is connected to the tip of the discharge tube 12a. Inside the discharge tube 12a and the screw casing 12b, a single or double screw 12d is rotatably arranged.

The screw casing 12b has an opening at its upper edge that is connected in a straight line to the portion of the conical wall portion 13c of the chute 13 that extends forward and backward. The powder in the chute 13 is filled into the screw casing 12b through the opening 12e at the upper edge of the screw casing 12b. The powder filled inside the screw casing 12b is sent into the discharge outlet tube 12c by the screw 12d, and is discharged to the outside from the discharge outlet tube 12c.

The agitation section 14 is mainly composed of an axial center portion 16 and agitation members 17A and 17B that rotate around the axial center portion 16. The axial center portion 16 is disposed so as to be perpendicular to the inclined surface 13b and to protrude toward the center of the interior of the chute 13 in a plan view. In other words, the axial center portion 16 protrudes obliquely upward from the lower portion inside the chute 13.

The first stirring member 17A is provided on the base end side of the shaft center 16. The second stirring member 17B is provided on the tip end side of the shaft center 16, above the first stirring member 17A. That is, the first stirring member 17A and the second stirring member 17B are arranged facing each other on the same axis (on the shaft center 16). The first stirring member 17A and the second stirring member 17B extend along the diameter direction of the inclined surface 13b of the chute 13. The first stirring member 17A and the second stirring member 17B are arranged so that they are perpendicular to each other and extend at different angles of 90 degrees from each other, centered on the shaft center 16, so that their phases are 90 degrees.

The first stirring member 17A and the second stirring member 17B rotate in the same direction and at the same period around the shaft center 16 as the shaft center 16 is driven by the motor 18. The motor 18 is disposed diagonally rearward of the chute 13. A worm gear 18a is attached to the tip of the drive shaft of the motor 18. A stirring section gear 18b is attached to the end of the downward protruding portion of the shaft center 16 of the stirring section 14. Furthermore, a discharge gear 18c is attached to the protruding portion of the rear end of the shaft of the screw 12d. The stirring section gear 18b and the discharge gear 18c are meshed with the worm gear 18a attached to the tip of the drive shaft of the motor 18. As a result, the motor 18 is driven, and the first stirring member 17A and the second stirring member 17B of the stirring section 14 and the screw 12d of the discharge section 12 are rotated via the stirring section gear 18b, the discharge gear 18c, etc.

The first agitating member 17A rotates around the shaft center 16, pushing up the powder and granular material inside the chute 13. Meanwhile, the second agitating member 17B rotates around the shaft center 16, pushing down the powder and granular material pushed up by the first agitating member 17A onto the inner surface of the chute 13.

Here, a comparison is made between the conventional powder/granular material supplying device 10A (when the inside of the chute 13 is stirred only by the first stirring member 17A) and the powder/granular material supplying device 10. FIG. 5 shows the distribution of pressure due to the powder/granular material in the hopper 11 and the chute 13. In FIG. 5, the region L indicates the region where the pressure due to the powder/granular material is low, and the region H indicates the region where the pressure due to the powder/granular material is high. As shown in FIG. 5(a), when the inside of the chute 13 is stirred only by the first stirring member 17A, the pressure due to the powder/granular material received by the front side of the chute 13 increases (the region L is small in FIG. 5(a)). On the other hand, as shown in FIG. 5(b), when the inside of the chute 13 is stirred by the first stirring member 17A and the second stirring member 17B, the pressure due to the powder/granular material received by the front side of the chute 13 decreases (the region L increases in FIG. 5(b)). In this way, the second agitating member 17B pushes down the powder particles pushed up by the first agitating member 17A onto the inner surface of the chute 13, eliminating the compaction of the powder particles on the inner wall of the hopper 11 and the front side of the chute 13 caused by the first agitating member 17A.

Furthermore, the second stirring member 17B stirs the powder near the side wall 13a of the chute 13 on the side where the discharge section 12 is provided, improving the fluidity of the powder. In particular, the fluidity of the powder is improved when the stirring members 17A and 17B are rotating at low speeds, which had been reduced by compaction of the powder. This makes it possible to eliminate compaction of the powder near the side wall 13a, which is the starting point of bridges or ratholes in the hopper 11 or chute 13.

In addition, in the powder/granular material supplying device 10, the powder/granular material is compressed by the first agitating member 17A and then broken down by the second agitating member 17B in a continuous cycle between the first agitating member 17A and the second agitating member 17B, thereby making it possible to keep the supply amount of powder/granular material constant.

As shown in Figs. 1 to 4 and 6, the first stirring member 17A and the second stirring member 17B are composed of a first stirring blade 21, a second stirring blade 22, and a stirring blade support member 23. In other words, the first stirring member 17A and the second stirring member 17B are composed of multiple (two) stirring blades.

The first agitator blade 21 is a long plate material that extends from one side of the agitator blade support member 23. The second agitator blade 22 is a long plate material that extends from the other side of the agitator blade support member 23 so as to form a straight line with the first agitator blade 21. The agitator blade support member 23 is fixed to the base end and tip end of the shaft center portion 16.

The longitudinal tip of the first stirring member 17A is curved toward the second stirring member 17B. Specifically, the longitudinal tips of the first stirring blade 21 and the second stirring blade 22 of the first stirring member 17A are curved toward the first stirring blade 21 and the second stirring blade 22 of the second stirring member 17B. More specifically, a curved portion 24 is formed upward on the tip side of the first stirring blade 21 and the second stirring blade 22 of the first stirring member 17A so as to fit along the inner surface of the conical wall portion 13c of the chute 13.

The longitudinal tip of the second stirring member 17B is curved toward the first stirring member 17A. Specifically, the longitudinal tips of the first stirring blade 21 and the second stirring blade 22 of the second stirring member 17B are curved toward the first stirring blade 21 and the second stirring blade 22 of the second stirring member 17B. More specifically, a curved portion 24 is formed downward on the tip side of the first stirring blade 21 and the second stirring blade 22 of the second stirring member 17B so as to fit along the inner surface of the side wall portion 13a of the chute 13.

The first stirring blade 21 and the second stirring blade 22 have a tapered shape in the longitudinal direction toward the tip. By making the first stirring blade 21 and the second stirring blade 22 tapered, the rotational resistance of the first stirring blade 21 and the second stirring blade 22 can be reduced. This reduces the rotational torque, reduces power consumption, and allows the motor for rotating the first stirring member 17A and the second stirring member 17B to be made smaller.

The first stirring member 17A and the second stirring member 17B have an incline on at least a portion of the surfaces facing each other. Specifically, an inclined portion 25 is provided on the upper surface of the first stirring blade 21 and the second stirring blade 22 of the first stirring member 17A (surfaces facing the lower surface of the first stirring blade 21 and the second stirring blade 22 of the second stirring member 17B) and on the lower surface of the first stirring blade 21 and the second stirring blade 22 of the second stirring member 17B (surfaces facing the upper surface of the first stirring blade 21 and the second stirring blade 22 of the first stirring member 17A).

As shown in FIG. 6, the inclined portion 25 is formed on the surface of the first agitating blade 21 and the second agitating blade 22 on the rotation direction K side with respect to the center of the width direction of the first agitating blade 21 and the second agitating blade 22. That is, the inclined portion 25 is provided on the surface formed on one side of the width direction from the center of the width direction of the first agitating blade 21 and the second agitating blade 22. By providing the inclined portion 25 on the first agitating blade 21 and the second agitating blade 22 in this manner, when the powder and granular material in the chute 13 is stirred by the first agitating member 17A and the second agitating member 17B, the first agitating member 17A can push up the powder and granular material in the chute 13, and the second agitating member 17B can push down the powder and granular material pushed up by the first agitating member 17A to the inner surface of the chute 13.

The first stirring member 17A and the second stirring member 17B have inclined surfaces formed on their longitudinal end faces. Specifically, the first stirring blade 21 and the second stirring blade 22 have inclined surfaces 26 formed on their longitudinal end faces. The inclined surfaces 26 are formed on the rotation direction K side of the first stirring blade 21 and the second stirring blade 22 with respect to the center in the width direction of the first stirring blade 21 and the second stirring blade 22.

In addition, in the powder supplying device 10, at least one of the powder contact surfaces in the hopper 11, discharge section 12, chute 13, and agitation section 14 is surface-treated to reduce the friction coefficient with the powder. Specifically, the parts in the hopper 11, discharge section 12, chute 13, and agitation section 14 that come into contact with the powder are processed (coated) by electroplating or the like. By surface-treating the parts that come into contact with the powder in this way, the flow resistance of the powder in the device is reduced. In particular, by surface-treating the side wall 13a of the chute 13 near where the tip of the second agitation member 17B passes when the second agitation member 17B rotates, the flowability of the powder in the vicinity of the side wall 13a of the chute 13 is improved, and compaction of the powder in the vicinity of the side wall 13a, which is the starting point of bridges or ratholes in the hopper 11 or chute 13, can be sufficiently eliminated.

Furthermore, in the powder/granular material supplying device 10, the phase between the first stirring member 17A and the second stirring member 17B is changed according to the characteristics of the powder/granular material being lowered into the chute 13. Here, examples of the characteristics of the powder/granular material include the compaction, bulk density, particle size, and adhesiveness of the powder/granular material. Specifically, the phase between the first stirring member 17A and the second stirring member 17B is changed to 90 degrees (FIG. 1), 45 degrees (FIG. 7), or 0 degrees (FIG. 8) according to the characteristics of the powder/granular material being lowered into the chute 13. Note that the phase between the first stirring member 17A and the second stirring member 17B is not limited to 90 degrees (FIG. 1), 45 degrees (FIG. 7), or 0 degrees (FIG. 8), and can be changed to various phases according to the characteristics of the powder/granular material.

As described above, in the powder supplying device 10, the powder pushed up by the first agitating member 17A is pushed down by the second agitating member 17B, which eliminates the compaction of the powder on the inner wall of the hopper 11 and the front side of the chute 13 caused by the first agitating member 17A pushing up the powder, and improves the fluidity of the powder when the agitating members 17A and 17B are rotating at low speeds, which had been reduced by the compaction. This prevents bridges or ratholes from occurring in the hopper 11 or chute 13.

In addition, in the powder supplying device 10, at least one of the powder contact surfaces in the hopper 11, discharge section 12, chute 13, and agitator section 14 is surface-treated to reduce the coefficient of friction with the powder, reducing adhesion of the powder to the inner wall surfaces of the device and reducing the amount of powder remaining in the device. This reduces waste raw materials. In addition, because adhesion of the powder to the inner wall surfaces of the device is reduced, the device is easier for workers to clean.

In this embodiment, the longitudinal tip of the second stirring member 17B is curved toward the first stirring member 17A, but this is not limited thereto, and as shown in Figs. 9 to 13, a branch stirring member 27 may be provided at the longitudinal tip of the second stirring member 17B. The branch stirring member 27 is formed by branching off from the longitudinal tip of the second stirring member 17B. Specifically, the branch stirring member 27 is formed by branching off from the longitudinal tips of the first stirring blade 21 and the second stirring blade 22 of the second stirring member 17B.

12 and 13, the branched stirring member 27 is a long plate material, and branches from the longitudinal ends of the first stirring blade 21 and the second stirring blade 22 to form the substantially T-shaped second stirring member 17B. The branched stirring member 27 is formed at a predetermined angle with respect to the first stirring blade 21 and the second stirring blade 22 so as to follow the side wall portion 13a (inner wall surface) of the chute 13 when the second stirring member 17B rotates. By forming the branched stirring member 27 to follow the side wall portion 13a (inner wall surface) of the chute 13, the powder and granular material near the upper part of the chute 13 can be reliably stirred. Specifically, by providing the branched stirring member 27 to the second stirring member 17B, the powder and granular material in the upper region R of the chute 13 located above the second stirring member 17B can be reliably stirred.

The branch stirring member 27 is composed of one plate material, but is not limited to this, and may be composed of multiple (e.g., two) plate materials. The branch stirring member 27 is not limited to forming the substantially T-shaped second stirring member 17B together with the first stirring blade 21 and the second stirring blade 22, and may be formed into a substantially Y-shaped or substantially arrow-shaped second stirring member 17B by branching the branch stirring member 27 formed in a curved shape, or the branch stirring member 27 formed of two plate materials from the first stirring blade 21 and the second stirring blade 22. Furthermore, the branch stirring member 27 branches in two directions (e.g., up and down) from the tips of the first stirring blade 21 and the second stirring blade 22, but is not limited to this, and may be branched only in one direction (e.g., upward) from the tips of the first stirring blade 21 and the second stirring blade 22.

In addition, in this embodiment, the first stirring member 17A and the second stirring member 17B have the same rotation period, but this is not limited to this, and the first stirring member 17A and the second stirring member 17B may be rotated at different periods. In other words, the first stirring member 17A and the second stirring member 17B may be rotated a different number of times. For example, while the first stirring member 17A rotates once, the second stirring member 17B is rotated two times.

In addition, in this embodiment, the first stirring member 17A and the second stirring member 17B are rotated in the same direction, but this is not limited to this, and the first stirring member 17A and the second stirring member 17B may be rotated in opposite directions. In this case, the first stirring member 17A and the second stirring member 17B are rotated in opposite directions by changing the rotation direction of the rotation shaft of the first stirring member 17A and the rotation shaft of the second stirring member 17B using a crown gear or the like.

Furthermore, in this embodiment, an inclined surface 13b is formed on the lower rear side of the chute 13, and the axial center portion 16 of the stirring section 14 is protruded so as to be perpendicular to the inclined surface 13b, but this is not limited to the above, and the lower rear side of the chute 13 may be a horizontal plane, and the axial center portion 16 may be protruded from the horizontal plane. In other words, the axial center portion 16 may not only be protruded at an incline diagonally upward, but may also be protruded vertically without being inclined diagonally.

Furthermore, in this embodiment, the first stirring member 17A and the second stirring member 17B are rotated on the same axis, but this is not limited thereto, and they may be rotated on different axes.

Furthermore, in this embodiment, the first stirring member 17A and the second stirring member 17B are configured with two stirring blades, the first stirring blade 21 and the second stirring blade 22, but this is not limited to this, and the first stirring member 17A and the second stirring member 17B may be configured with one stirring blade (one long plate material). Furthermore, the first stirring member 17A and the second stirring member 17B may be configured with only one of the stirring blades, the first stirring blade 21 and the second stirring blade 22, or may be configured with three or more stirring blades.

Furthermore, in this embodiment, the inclined portion 25 of the first stirring member 17A and the second stirring member 17B is formed on the surface of the first stirring blade 21 and the second stirring blade 22 on the rotation direction K side with respect to the center of the width direction of the first stirring blade 21 and the second stirring blade 22, but this is not limited to this, and the inclined portion 25 may also be formed on the surface of the first stirring blade 21 and the second stirring blade 22 opposite the rotation direction K. In other words, the inclined portion 25 may be formed so that the cut surface in the width direction of the first stirring blade 21 and the second stirring blade 22 is approximately mountain-shaped or approximately trapezoidal.

Furthermore, in this embodiment, the stirring unit 14 is composed of the first stirring member 17A and the second stirring member 17B, but this is not limited to this, and it is also possible to provide a separate stirring member above the second stirring member 17B, making it possible to have three stirring members.

Furthermore, in this embodiment, the first stirring member 17A, the second stirring member 17B, and the screw 12d are configured to be driven by one motor 18, but this is not limited to this, and they may be driven by multiple motors that are independently controlled. For example, as shown in FIG. 14, a powder supplying device 10B is provided with a stirring motor 30 for rotating the first stirring member 17A and the second stirring member 17B, and a discharge motor 31 for rotating the screw 12d of the discharge section 12. The stirring motor 30 and the discharge motor 31 are connected to a control section (not shown) and are independently controlled by the control section. The driving force of the stirring motor 30 is transmitted to the shaft center section 16 via a driving bevel gear 32 and a driven bevel gear 33, etc. The driving force of the discharge motor 31 is transmitted to the screw 12d via a driving spur gear 34 and driven bevel gears 35, 36, etc.

Furthermore, in this embodiment, the worm gear 18a attached to the tip of the drive shaft of the motor 18 is meshed with the stirring gear 18b and the discharge gear 18c, so that the driving force of the motor 18 is transmitted to the first stirring member 17A, the second stirring member 17B, and the screw 12d via the stirring gear 18b, the discharge gear 18c, etc., but this is not limited to the configuration, and may be configured, for example, as in the powdered material supplying device 10C shown in Figure 15. In the powdered material supplying device 10C, a stirring driven spur gear 42 and a discharge input spur gear 43 are meshed with a driving spur gear 41 attached to the tip of the drive shaft of the stirring and discharge motor 40. As a result, the driving force of the stirring/discharge motor 40 is transmitted to the stirring driven spur gear 42 via the driving spur gear 41, and then to the driving bevel gear 44 and the driven bevel gear 45, causing the first stirring member 17A and the second stirring member 17B to rotate. At the same time, the driving force of the stirring/discharge motor 40 is transmitted to the discharge input spur gear 43 via the driving spur gear 41, and then to the driven bevel gears 35 and 36, causing the screw 12d to rotate.

REFERENCE SIGNS LIST 10 Powder/granular material supply device 11 Hopper 12 Discharge section 13 Chute 14 Agitation section 17A First agitation member 17B Second agitation member

Claims (12)

A hopper into which powder and granular material are fed;
A discharge section that discharges the powder and granular material;
a chute for guiding the powder or granular material dropped from the hopper to the discharge section;
a stirring unit provided inside the chute for stirring the powder or granular material dropped from the hopper;
A powder/granular material supplying device comprising:
The stirring unit includes:
A first stirring member that stirs the powder or granular material so as to push it upward;
a second agitating member provided above the first agitating member for agitating the powder or granular material by pushing it down;
A powder/granular material supplying device comprising: The powder material supplying device according to claim 1 , wherein the second agitating member is disposed coaxially opposite to the first agitating member. 3. The powder material supplying device according to claim 2, wherein the second agitating member has at least a part of a surface thereof opposed to the first agitating member that is inclined. 4. The powder or granular material supplying device according to claim 1, wherein a tip end of the second agitating member in a longitudinal direction is curved toward the first agitating member. The second stirring member includes a branched stirring member formed by branching from a tip end in a longitudinal direction thereof,
The powder material supplying device according to claim 1 , wherein the branching stirring member is formed so as to fit along an inner wall surface of the chute. 6. The powder material supplying device according to claim 4 or 5, wherein the second agitating member has a shape tapered toward a tip end in a longitudinal direction thereof. 7. The powder material supplying device according to claim 4, wherein the second agitating member has an inclined surface formed on an end surface in a longitudinal direction thereof. 8. The powdered or granular material supplying device according to claim 1, wherein a phase between the first agitating member and the second agitating member is changeable in accordance with characteristics of the powdered or granular material to be dropped into the chute. The powder material supplying device according to claim 1 , wherein the first agitating member and the second agitating member have different rotation periods. The powder material supplying device according to claim 1 , wherein the first agitating member and the second agitating member rotate in opposite directions to each other. The powdered material supplying device according to any one of claims 1 to 10, characterized in that the first stirring member and the second stirring member rotate about an axial center portion that protrudes obliquely upward from a lower portion inside the chute. 12. The powdered material supplying device according to claim 1, wherein at least one of the powder contact surfaces of the hopper, the discharge section, the chute and the stirring section is subjected to a surface treatment to reduce a friction coefficient with the powdered material.

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