JPS6040517Y2 - Powder micro-feeding device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus that enables stable supply of a small amount of powder.

A screw feeder as shown in FIG. 1 is a typical example of a conventional small amount supply device for powder.

This screw feeder consists of a main body 1 and a powder storage container 2.
are fixed by a port 3, and a screw shaft 6 having a screw 11 integrally machined in a spiral shape with bearings 4 and 5 is supported on the left and right opposing side surfaces 1b and lc of the main body 1, respectively.

And a shaft joint 6a on one side of the screw shaft 6, a shaft joint part 6
b is coaxially fastened to the shaft joint 8 of the variable speed motor 9 by a bolt 7.

The powder 10 stored in the powder storage container 2 descends to the main body 1.
Enter the lower left 1d.

When the variable speed motor 9 rotates the screw shaft 6 supported by the bearings 4 and 5 via the shaft coupling 8, the screw shaft 6
The screw 11 integrated with the main body 1 rotates and the lower left 1d of the main body 1
The powder 10 that has reached the main body 1 is transferred to the right side 1f through the screw pipe 1e of the main body 1, and is discharged downward from the lower discharge port 1g of the right side 1f of the main body 1.

The supply amount of the powder 10 is determined by the diameter D1 and the pitch P of the screw 11, and the supply amount is changed by changing the rotation of the screw 11 using the variable speed motor 9.

In such a screw feeder, the screw 11
The structure is such that constant supply is performed by the diameter and pitch P of the powder and the rotation of the screw 11. However, in actual machine operation, the influence of the degree of compaction depending on the amount of powder in the powder storage container 2 and the influence of the degree of compaction due to the amount of powder in the powder storage container 2 and the Since the powder capacity between the screws 11 changes due to changes in the rotational speed of the screws, there is a drawback that the amount of powder supplied is not constant.

The above effects are particularly noticeable when the amount of powder supplied is small.
It is difficult to feed small amounts of powder below 0g/H, and with such a screw feeder, the powder tends to stick to each other and be fed in clumps. Moreover, it was impossible to supply it quantitatively.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of conventional devices, and to provide a powder feeding device that can stably supply even small amounts of powder, and has good dispersibility and continuity. A mesh-like quantitative supply plate provided at the powder storage container and the powder discharge port at the bottom of the container, and at the upper and lower parts of the quantitative supply plate, the bridging phenomenon of agglomeration and powder due to the degree of compaction of the powder is observed in the upper part. The brush is equipped with a blade that is placed on the rotating shaft to prevent the powder from floating and stirring, and an elastic brush is attached to the rotating shaft below the metering supply plate.

The rotary shaft is driven by an ultra-fine variable speed motor, and is configured to rotate while constantly brushing off the powder adhering to the quantitative supply plate.

Hereinafter, the present invention will be explained with reference to FIG.

101 is a funnel-shaped powder storage container, and 102 is a powder.

Reference numeral 101a designates a lower powder discharge port, to which a powder supply cylinder 105 is fixed by a bold 108 via a mesh-like quantitative supply plate 103 and a sealing gasket 104.

Further, a lid 101b is attached to the upper end surface of the powder storage container 101 by a port 109.

A hollow inner cylinder 107 is located at the center of the funnel-shaped powder storage container 101.
a is fixed by a support arm 107b.

Two upper and lower bearings 107c are fixed inside the hollow inner cylinder 107a to support a rotating shaft 107d.

The rotary shaft 107d has an elastic brush 11 at its lowermost end.
0 is fixed, and a blade 110b that is in charge of floating and stirring the powder is fixed above the quantitative supply plate 103.

A resin plate 107E with low sliding resistance is placed on the upper end surface of the upper bearing 107C, and a brush 11 is placed on the upper surface of the resin plate 107E.
A position adjusting ring 107f of 0 is attached so that the brush 110 can be adjusted so that it rolls into contact with the mesh-like quantitative supply plate 103.

The upper end of the rotating shaft 107d is connected to the low speed variable speed motor 107 by a small free joint 107g.

A rotary shaft 107d is rotated by a low speed variable speed motor 107.

The hole diameter of the mesh quantitative supply plate 103 is, for example, a particle diameter of 74~
53 micrometers, 124 micrometers for that particle
Use a micrometer with a hole diameter approximately twice the particle diameter.

In such a device, the lid 101b and the low speed variable speed motor 10 are fixed to the upper part of the powder storage container 101.
7 is removed and powder 102 is introduced from above into the powder storage container 101 and stored.

Next, the lid 101b is fixed, and then the low speed variable speed motor 107
Install.

Since the amount of powder falling is proportional to the rotation speed of the low speed variable speed motor 107, the rotation speed of the low speed variable speed motor 107 is determined in accordance with the required amount.

In this way, when the low speed variable speed motor 107 is rotated, a certain amount of powder is dispersed and continuously discharged into the powder supply cylinder 105 per unit time.

Moreover, under only the above conditions, the powder 102 is
A bridge is formed on the upper side of the powder to prevent it from falling, and the powder is formed into an agglomerate due to the dense pressure at the top of the powder.
The powder is pushed upward somewhat by the blade 110b fixed at point d, and is further subjected to a slight stirring action, thereby completely preventing bridging and agglomeration of the powder.

As explained above, in this embodiment, the supply amount of the powder 102 is determined by the hole diameter of the mesh quantitative supply plate 103, the contact strength between the quantitative supply plate 103 and the brush 110, and the low speed variable speed motor 107.
Since the amount of powder 102 supplied is always constant, it is easy to grasp the amount of powder supplied, and the dispersion is also good.

According to this embodiment, it is possible to It is possible to supply trace amounts of 100g/H or less.

FIG. 3 is a graph showing the experimental results of this powder supply performance, in which the vertical axis shows the supply amount per unit time, and the horizontal axis shows the rotation speed of the low-speed variable speed motor 107.

In this case, the powder container 101 is a metal container with a volume of approximately 500rrLL, and the diameter of the quantitative supply plate 103 is 35mmφ.
Supply plate 103 hole diameter 124 micrometers, powder 102
Pulverized coal having a particle size of 74 to 53 micrometers was used.

As is clear from this test result, it is possible to supply a small amount of powder below loOg/H, which was previously considered impossible, in a quantitative and stable manner in proportion to the rotational speed of the low-speed variable speed motor 107. I understand.

From the above results, the present invention is excellent as a stable fixed quantity supply device for powder, and its effectiveness is clear, especially when supplying a small amount of powder.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, FIG. 2 is a sectional view of an embodiment of the present invention, and FIG. 3 is a graph showing experimental results of powder supply performance. 101b: Lid, 105: Powder supply cylinder, 101: Powder storage container 107a: Hollow inner cylinder, 107: Variable speed motor, 1
10b: Feather, 103: Quantitative supply plate, 110: Brush, 1
07d: Rotation axis.

Claims (1)

[Scope of utility model registration request] A funnel-shaped powder storage container equipped with a lid on the upper end surface and a powder supply tube attached to the lower end surface via a mesh-like fixed quantity supply plate, and a hollow space coaxially installed in the powder storage container. The inner cylinder is coaxially attached to the hollow inner cylinder via a bearing, and the upper end is connected to a variable speed motor, and the lower end has a blade and below the blade, the lower surface of the quantitative supply plate. 1. A micro-feeding device for powder, comprising: a rotary shaft having a brush attached in a direction in which it comes into contact with the rotating shaft;