JPS5962479A - Screw feeder hopper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screw feeder hopper configured to quantitatively discharge compactable powder such as wheat flour.

Filling the hopper with powder and granules when discharging them with the screw! The filling density of the screw changes depending on the level. In particular, wheat flour
This phenomenon is noticeable in compacted granular materials such as cement, and the discharge amount fluctuates as the packing density changes, and if the compaction is severe, the compacted granular materials may cause a bridging phenomenon in the hopper. be.

In a conventional screw feeder, as shown in FIG. 1, a granular material 2 in a hopper 1 is discharged from a discharge port 4 by a screw 3 having a constant pitch. When the pitch is constant in this way, as shown by arrow 5, there is a non-mass flow where the discharge is mainly from the back of the hopper 1, and other parts where no discharge occurs are consolidated and the discharge fluctuates. was occurring. Therefore, in other types of conventional screw feeders, as shown in FIG. Attempts have been made to equalize the discharge amount by creating a mass flow as shown in Figure 2. However, even with screw feeders that generate mass flow, it is difficult to ensure uniformity of the discharge amount over a long period of time. This was difficult in the case of compactable powder.

Therefore, an object of the present invention is to provide a hopper structure for a screw feeder that can quantitatively discharge compactable powder or granular materials.

The present invention provides a screw feeder in which a screw is disposed at the bottom of a powder hopper, in which one first wall of the hopper walls extending in the axial direction of the screw is moved from a vertical position relative to the other second wall. The second wall is extended to the lower part of the hopper to form a small chamber between the second wall and the first wall, and a vent is provided at the top of the small chamber and a screw is provided at the bottom of the small chamber. In the small chamber, an agitator is provided that extends above the screw over the entire length of the hopper near the boundary between the hopper and the small chamber, and this agitator moves the powder and granules in the hopper into the The present invention provides a screw feeder hopper configured to rotate in a direction to feed bacteria from the first wall toward the second wall, while the screw rotates in the opposite direction to the agitator.

Next, a screw feeder hopper according to the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

FIG. 3 shows a cross-sectional view of the screw feeder of the present invention. The hopper 1 has a substantially trapezoidal cross section. When viewed in the axial direction of the screw 3 disposed below the hopper 1, the hopper walls extending in the axial direction are such that one first wall 7 is inclined from a vertical position compared to the other second wall 8. The pressure is reduced (α1 < α2), and the second wall 8 is configured to bear more of the pressure of the granular material 2. + below this hopper l! The second wall 8 is extended to form a small chamber 10 between it and the first wall together with the seven walls 9, and the screw 3 is disposed at the lower end of this small chamber. The screw 3 may have a constant pitch, but it is more preferable to have a variable pitch.

In addition, if we take the case of flour as an example, the wall of the hopper is
Preferably, the rigidity f+degree α1 of the wall 7 is 150 to 25°, and the slope α2 of the second wall 8 is 25° to 35°.

Between the hopper 1 and the small chamber 10, a stirrer 11 is disposed in the small chamber 10 on the -E side of the screw 3. Stirrer 1
1 can be constructed of a commonly used grade or rotary shaft with a face.

The direction of rotation of the agitator 11 is preferably the direction indicated by the arrow 12 so as to feed the granular material 2 toward the first wall 7 or the second wall 8 having a large slope. On the other hand, screw 30
The direction of rotation is preferably opposite to the direction of rotation of the stirrer 11, as shown by the arrow 13, so as to receive the granular material sent out by the stirrer 11.

In addition, a vent 14 is provided above the small chamber 10 to prevent the generation of air bubbles or bridging phenomenon in the powder layer.
will be established.

Next, the operation of the screw feeder of the present invention will be briefly explained.

5- Consolidated powder 2 such as flour filled in hopper 1
As the stirrer 11 rotates in the direction of arrow 12, it is fed toward the second wall 8 with a larger inclination, and is fed into the small chamber lO along the second wall 8, and rotated in the direction of arrow 13. The unnecessary air in the small chamber 10 is exhausted from the vent 14.

The screw feeder of the present invention that operates in this manner has many advantages as described below.

(Since a small chamber is formed above the IJ screw to relieve the pressure of the powder, the pressure of the powder does not directly apply to the screw, and the screw does not directly discharge the consolidated powder. .

12) Before filling the screw with powder or granules, the density of the compacted powder or granules is made uniform using a stirrer, so that quantitative discharge is possible.

+3) Since a vent is formed in the small chamber, it is possible to smoothly fill the screw with powder and granular material.

(4) Due to the combined effect of the above-mentioned medium to +3), smooth quantitative discharge can be performed even if the powder is compacted.

The screw feeder of the present invention described below and the second
The discharge performance of the screw feeder shown in the figure was compared using wheat flour. The results are shown in FIG. The screw feeder of the present invention has an inclination angle of 2 of the first wall.
5°, the second wall has an inclination angle of 3o''J, the stirrer is of the type in which rod-shaped bodies are arranged in a cylindrical shape at intervals of 50 mm, the maximum pitch is a screw with a maximum pitch of 35 mm, and the discharge is carried out at a filling amount of 129 mm. As is clear from the graph shown in Fig. 4, the discharge curve I of the screw feeder of the present invention realizes more stable quantitative discharge than the discharge curve I of the conventional feeder.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the discharge characteristics of a conventional screw feeder, Figure 3 is a cross-sectional view of the screw feeder hopper of the present invention, and Figure 4 is a diagram showing the Sufu 1 feeder of the present invention and a conventional screw feeder. 2 is a graph showing the emission characteristics of. Explanation of symbols 1... Hopper, 2... Powder, 3... Screw, 4... Discharge port, 7, 8... Hopper wall, 9...
Small chamber wall, 10...small size, 11...stirrer, 12...
Rotation direction of the stirrer, 13...Rotation direction of the screw,
14 Pa Bento Figure 1

Claims (1)

[Claims] Powder hopper〇In a screw feeder with a screw disposed at the bottom, one first wall of the hopper wall extending in the axial direction of the screw is connected to the other second wall.
The second wall is extended to the lower part of the hopper to form a small chamber between the wall and the first wall, and a vent is provided at the top of the small chamber, and a vent is provided at the bottom of the small chamber. A screw is provided in the small chamber, and a stirrer is provided in the small chamber that extends above the screw over almost the entire length of the hopper near the boundary between the hopper and the small chamber, and this stirrer is used to control the powder and granular material in the hopper. A screw feeder hopper, characterized in that the screw is configured to rotate in a direction in which the agitator is fed from the first wall toward the second wall, while the screw is configured to rotate in the opposite direction to the agitator.