JP2020100485A - Constant feeder device of powder and granular material - Google Patents

Abstract

To reduce a phenomenon of powder and granular material bridging in a storage container.SOLUTION: The device includes: a storage container; a main shaft protruding into the storage container; a first blade body which is fixed to the main shaft and has a plurality of blades for feeding out powder and granular material are provided; a quantification part which is positioned below the first blade body to quantify the powder and granular material supplied from the first blade body; and a second blade body which is, at the upper part of the first blade body, fixed to the main shaft and has a plurality of blades. In the second blade body, a distance from the tip end of at least one blade of the second blade body to an inside surface of the storage container is smaller than a distance from the tip end of the blade of the first blade body to the inside surface of the storage container.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a quantitative feeder device that precisely and quantitatively discharges powdered particles.

Conventionally, quantitatively discharging (supplying) a powder or granular material (powder, powder or granular material, or a mixture of powder and powder or granular material) in a trace amount is a physical property of the powder or granular material, for example, specific gravity. , Particles, difference in particle size, and adhesion and cohesiveness caused by moisture and static electricity make the work extremely difficult. With respect to such a problem, the applicant has developed a powdery/quantitative powder feeder described in Patent Document 1. This powdery/quantitative substance feeder is attached to a main body, a container for storing the powdery body, a drive unit installed below the storage container, a main shaft projecting from the drive unit into the storage container, and a main shaft. It has a supply means composed of a plurality of blades, a supply plate attached to the rotary shaft and having a powder measuring groove formed on the periphery at an appropriate pitch, and a discharge chute formed below the outer end of the supply plate. doing.

The powder or granular material supplied to the storage container is sent to the lower supply plate by the blade member of the supply means that rotates in the storage container. Since the metering groove is formed on the supply board, the powder particles measured by the metering groove are rotatably conveyed by the rotation of the supply board and discharged from the discharge chute.

Japanese Patent No. 5430170

However, the granular material is in the form of fibers such as cotton shavings of pencil sharpener and cotton, and in the case where the granular materials are entangled with each other, in the vicinity of the center in the height direction of the granular material in the container, A phenomenon (hereinafter, simply referred to as a bridge) in which the powder and granules are compressed to close the lid in a dome shape may occur. When this bridge occurs, there is a problem that the powder or granular material is not supplied from the container to the supply board having the measuring groove, and the quantitative determination is interrupted.

The present invention has been made to solve such a problem, and prevents a granular material from bridging in a container, and a quantitative granular material feeder device capable of realizing highly accurate quantitative determination. The purpose is to provide.

The inventors examined the phenomenon that powder particles are bridged in the storage container as described above. As a result, the force of the powder or granules being compressed downward by its own weight in the container and the force of pushing up the powder or granules that have surpassed the surface of the blade by the rotation of the blade of the supply means work simultaneously. , It was predicted that the granular material would be compressed at the center of the granular material in the height direction of the container.

If the inventors can make the force for pushing up the powder or granular material upward by the blade body in the circumferential direction through this prediction, the powder or granular material in the storage container is difficult to be compressed in the horizontal direction. Therefore, it was thought that the bridge could be collapsed from there and eventually the occurrence of the bridge could be prevented. Therefore, in addition to the conventional blade body, by providing another blade body having a shorter length above the conventional blade body, the force of the blade body pushing up the powder body is made uneven in the circumferential direction, and The present invention has been accomplished based on the finding that the body can be prevented from being bridged.

The present invention has the following features in order to achieve such an object.

[1] An accommodating container, a main shaft protruding into the accommodating container, a first blade body provided with a plurality of blades attached to the main shaft and for feeding out the powder and granular material, and located below the first blade body, A quantification unit for quantifying the powder or granular material supplied from the first blade body,
A second blade body attached to the main shaft above the first blade body and provided with a plurality of blades,
The quantitative feeder device for powder particles, wherein the distance from the tip of at least one blade of the second blade to the inner surface of the storage container is smaller than the distance from the tip of the blade of the first blade to the inner surface of the storage container.

[2] In the plan view, each blade of the second blade body is overlapped with at least a part of the blade of the first blade body, and the quantitative powder feeder for granular material according to [1].

[3] The quantitative feeder for powder particles according to [2], wherein the first blade body and the second blade body rotate in synchronization.

[4] A part of the inner surface of the container is provided with a partition plate projecting from the inner surface of the container toward the main shaft at a height between the first blade body and the second blade body. The tip end of the plate is located between the main axis and the outer circumference of the circle onto which the rotation of the second blade body is projected in plan view, [1] to [3] quantitative feeder for powder particles ..

It is sectional drawing which shows the whole structure of the fixed_quantity|quantitative_assay feeder apparatus of the granular material which concerns on embodiment of this invention. It is a top view which shows the structure of the fixed_quantity|quantitative_assay part of the fixed_quantity|quantitative_assay feeder of the granular material which concerns on embodiment of this invention.

Hereinafter, with reference to the attached drawings, a quantitative powder feeder for powder and granular materials according to an embodiment of the present invention will be described. FIG. 1 is a diagram showing an overall configuration of a powdery/quantitative material quantitative feeder device according to an embodiment of the present invention. As shown in FIG. 1, the quantitative feeder for powder and granules includes a container 2 in which the powder and granules 1 are housed, a quantifying unit 3 for quantifying the powder and granules 1 dropped from the container 2, and a quantifying unit. A discharge chute 4 for discharging the powdery or granular material 1 weighed by 3 is provided in this order from the top. The storage container 2, the fixed amount unit 3, and the discharge chute 4 are fixed to the frame 8. The storage container 2 has a cylindrical shape, and is provided with an opening 2a on the upper side to which the powdery material 1 as a raw material is supplied. The storage container 2 is mounted on the frame 8 via the fixed amount unit 3.

A main shaft 11 is provided below the storage container 2, and a first blade body 14 and a second second blade body 15 are attached to the main shaft 11 in order from the top. The first blade body 14 has the same configuration as a conventional blade body that feeds out the powder particles from the lower portion of the container 2 to the quantification unit 3. The second blade body 15 agitates the powder or granular material in the storage container 2. The first blade body 14 and the second blade body 15 are installed apart from each other in the height direction by t, and when the height of the container 2 is T, a distance of t=T/20 to T/5 or so. Is set to.

The quantification unit 3 has a cylindrical tray 21 (FIG. 2) having a bottom, and a supply plate 5 and a discharge plate 6 which are two discs housed in the tray 21. The tray 21 has a shape of “8” along the outer shapes of the supply board 5 and the discharge board 6 in a plan view. The supply board 5 is configured to rotate around a rotation shaft 51. The rotating shaft 51 is coupled to the output shaft of the motor 7 via a speed reducer (not shown).

The supply board 5 is formed with a plurality of recesses on its peripheral edge. The granular material is accommodated in this concave portion, and the granular material is weighed. This recess is referred to as a metering hole 5a.

The discharge plate 6 is provided with a convex portion that meshes with the fixed amount holes 5 a of the supply plate 5. The discharge plate 6 is configured to forcibly discharge the powder or granular material from the fixed amount holes 5a at a position where it meshes with the supply plate 5.

Holes 21a are formed in the tray 21 at positions where the supply plate 5 and the discharge plate 6 mesh with each other. The discharge chute 4 is arranged below the hole 21a. The powder or granular material filled in the fixed quantity holes 5a of the supply board 5 is forcibly discharged by the discharge board 6, passes through the holes 21a, and is discharged from the discharge chute 4.

In addition, the configuration of the quantification unit is not limited to the above-described form, and various configurations can be used. For example, the discharge board 6 may not be provided.

A cover 12 having an opening 12 a is provided between the container 2 and the quantification unit 3. Further, on the inner surface of the container 2, a partition plate is provided between the first blade body 14 and the second blade body 15 in the height direction so as to cover a part of the opening 12a of the cover 12 in a plan view. 16 are provided. The tip of the partition plate 16 is located between the center of the container 2 and the circle through which the tip of the second blade body 15 passes in plan view.

FIG. 2 is a plan view showing the configuration of the quantification unit of the quantification feeder for powder and granules according to the embodiment of the present invention.

As shown in FIG. 2, the first blade body 14 has four blades, and each blade extends in the tangential direction of the main shaft 11 to the vicinity of the inner side surface of the container 2. The first blade body 14 rotates in a clockwise direction, and an inclined portion 14a that is inclined so that its height decreases toward the front end side is formed at the front end side in the traveling direction of each blade.

The second blade body 15 has four blades, and each blade extends in the tangential direction of the main shaft 11. The second blade body 15 rotates clockwise in synchronization with the first blade body 14.

In a plan view, the second blade body 15 arranged above has a shape overlapping the first blade body 14 arranged below. The blades of the second blade body 15 are formed in a shape shortened by the amount of the first blade body 14 excluding its tip. Each blade of the second blade body 15 is shorter by a distance L than each blade of the first blade body 14. Specifically, when the length from the central axis of the storage container 2 to the tip of the blade of the first blade body 14 is r, at least one blade of the second blade body 15 is The length to the tip has a length of 0.2 to 0.7 times r. In this embodiment, all the blades have the same shape, and the blade length of the second blade body 15 is 0.6 times the blade length of the first blade body 14. There is.

In the quantitative powder feeder according to the present embodiment described above, first, when the first blade body 14 rotates along the surface of the cover 12, one of the powder particles 1 stacked on the surface of the cover 12 is The portion intermittently rides on each blade of the first blade body 14.

This action is the same as in the conventional fixed amount feeder device having no second blade body 15. That is, the powder particles 1 are pushed upward by each blade of the first blade body 14, and at this time, the powder particles 1 are pressed downward by their own weight and the powder particles 1 are compressed from the vertical direction. Occurred, and a bridge was generated in the conventional quantitative feeder device.

On the other hand, in the quantitative feeder device of the present embodiment, the second blade 15 having the blade that overlaps the blade of the first blade body 14 in plan view is provided on the first blade 14. With such a configuration, the second blade body 15 pushes up the powder or granular material upward on the upper surface and blocks the force from the first blade body 14 on the lower surface.

As a result, it is possible to reduce the force applied to the portion that has been compressed in the vertical direction due to its own weight and the rotation of the first blade body 14, and it is possible to make the bridge less likely to occur.

Further, by providing the partition plate 16 that closes a part of the opening 12a of the cover 12 on the inner side surface side of the storage container 2 with respect to the second blade body 15, at least above the opening 12a, the first blade body is provided. By preventing the tip end side of 14 from transmitting the force for pushing up the granular material 1, it is possible to further prevent the occurrence of the bridge. At the same time, by providing the partition plate 16 below the second blade body 15, the powder particles 1 accumulated on the surface of the partition plate 16 are agitated and the blade 15a is agitated by the second blade body 15 having a shorter length. In the outer periphery of the storage container 2 that is not protected, the powder and granular material 1 is prevented from being crushed by its own weight and moving to the fixed quantity portion 3 through the opening 12a by a larger amount than expected, The amount of movement to the quantification part 3 can be stabilized.

In addition, in this embodiment, although the 2nd blade|wing body 15 demonstrated the example which has a shape which corresponds to the base end side of the 1st blade|wing body 14, the one part of the 1st blade|wing body 14 is planarly viewed. It suffices that the shape of the second blade body 15 overlaps with the second blade body 15. The blades of the second blade body 15 may be wider, narrower, or have a phase shift in the circumferential direction.

The number of blades and the extending direction thereof are not limited to this, and can be set arbitrarily.

DESCRIPTION OF SYMBOLS 1 Powder/granule 2 Storage container 3 Fixed amount section 21 Tray 4 Ejection chute 5 Supply board 6 Emission board 7 Motor 8 Frame 12 Cover 14 First blade body 15 Blade body 16 Partition plate

Claims (4)

A storage container, a main shaft projecting into the storage container, a first blade body attached to the main shaft and provided with a plurality of blades for sending out powdery particles, and a first blade body located below the first blade body. A quantification unit that quantifies the powder and granules supplied from the body,
A second blade body attached to the main shaft above the first blade body and provided with a plurality of blades,
The quantitative feeder device for powder particles, wherein the distance from the tip of at least one blade of the second blade to the inner surface of the storage container is smaller than the distance from the tip of the blade of the first blade to the inner surface of the storage container. The quantitative feeder for a granular material according to claim 1, wherein each blade of the second blade body overlaps at least a part of the blade of the first blade body in a plan view. The quantitative feeder device for powder particles according to claim 2, wherein the first blade body and the second blade body rotate in synchronization with each other. A partition plate projecting from the inner surface of the storage container toward the main shaft is provided at a part of the inner surface of the storage container at a height between the first blade body and the second blade body, and a tip of the partition plate. Is located between the main axis and the outer circumference of the circle onto which the rotation of the second blade body is projected in plan view, The quantitative feeder device for powdery or granular material according to any one of claims 1 to 3.

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