JPS6152069B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a helicoidal silo.

A helicoidal silo is composed of an outer cylinder wall 1 and an inner cylinder wall 2 of a metal double cylinder arranged concentrically as shown in Figs. 1 to 5. There are usually 6 to 12 spiral partition walls 3 between the wall 2
This is a specially shaped silo that is divided into sections and used as a storage room. For example, the angle of inclination of the joint between the silo outer cylinder wall 1 and the spiral partition wall 3 is 60°, and the angle of inclination of the joint between the inner cylinder wall 2 and the spiral partition wall 3 is 79.1°. As a result, one storage chamber 4 includes vertical walls of the outer cylinder wall 1 and the inner cylinder wall 2, a spiral partition wall 3A with a positive slope, that is, a bottom wall, and a spiral partition wall 3B with a negative slope. In other words, it is composed of four sides including the ceiling and walls. Note that a spiral partition wall with a negative slope becomes a spiral partition wall with a positive slope in the adjacent room. A hopper portion 5 is provided at the lower end of the storage chamber 4 having such a configuration, and the hopper portion 5 includes a hopper outer wall 6 formed in a state that is squeezed from the lower end of the outer cylinder wall 1 toward the inner cylinder wall 2; It consists of hopper side walls 8 and 9 that contract toward the discharge port 7 and the inner cylinder wall 2, and at the bottom of the hopper side walls 8 and 9 there are declectors 10 and 11 that further compress the hopper portion 5 toward the discharge port 7. is provided.
However, since the helicoidal silo has the above-mentioned storage chamber shape, the storage powder 12 is discharged through the vertical inner cylinder of the storage chamber 4, as shown by the arrows in FIGS. 3 to 5. There was a drawback that only the corner portion 13 formed by the wall 2 and the spiral partition wall 3B having a negative slope resulted in funnel flow discharge.

The present invention aims to eliminate the above-mentioned drawbacks, and in a helicoidal silo that is divided into a plurality of storage chambers by a spiral partition wall between the inner cylinder and the outer cylinder of the helicoidal silo, from the lower end of the outer cylinder wall. A convex powder flow control plate with an inclination is extended from the inner cylinder wall side toward the hopper wall side which has a constricted shape toward the inner cylinder wall, and between the flow control plate and the hopper wall. By configuring the gap formed in the gap to be fan-shaped and wide on the side of the partition wall with a positive slope and narrow on the side of the partition wall with a negative slope, the stored powder discharged from the gap can be reduced. The present invention provides a helicoidal silo that converts the flow of granules into a mass flow.

Hereinafter, the method of the present invention will be explained in detail based on the drawings showing one embodiment thereof. In FIGS. 6 and 7, as indicated by hatching in the figures, a powder flow control plate 14 is attached to extend from the inner cylinder wall 2 of the helicoidal silo toward the hopper outer wall 6 of the hopper section 5. The mounting angle (angle of inclination) of the flow control plate 14 is generally the same as the hopper angle, and the flow control plate 14 has a convex shape (part of a conical shape) with respect to the concave shape of the hopper outer wall 6. The gap 15 formed between the flow control plate 14 and the hopper outer wall 6 is
As shown in FIG. 8, the side of the spiral partition wall 3A with a positive slope is wide, and the side of the spiral partition wall 3B with a negative slope is narrow. However, storage powder 1
The mounting angle of the flow control plate 14 may be different from the hopper angle due to the difference in physical properties (internal friction angle, wall surface friction angle, etc.) between the two. flow control plate 14
The lower part of the silo may be maintained in its original state as the hopper part 5, or the lower part may be removed to keep the overall height of the silo body low; however, in this case, the storage powder 12 A prerequisite for mass flow discharge is to allow the stored powder and granular material 12 to flow down from the entire gap 15 when discharge is started, regardless of the amount of discharge. Therefore, the method of squeezing the elongated gap 15 to the discharge port 7 is important.

An example of a case where mass flow can be achieved will be explained based on FIGS. 9 to 12. As shown by the arrows in FIG. 9, when mass flow is achieved, the stored powder and granular material 12 as a whole descends and can be properly discharged. This will be explained based on the diagrams shown in FIGS. 11 and 12 showing the relationship between the remaining position of the stored powder and granular material and the vertical descent speed of the stored powder and granular material immediately above the hopper section. Each symbol in the figure corresponds to the symbol of the powder at each corner of the storage chamber 4 shown in FIG. 10a, and the width of the gap 15 is a spiral with a negative slope as shown in FIG. 10b. The width (x) on the side of the spiral partition wall 3B has a positive slope and the width (2x) on the side of the spiral partition wall 3A.
Set it to 1/2. Fig. 11 shows the case where the mounting angle of the flow control plate 14 is the same as the hopper angle, and Fig. 12 shows the case where the mounting angle of the flow control plate 14 is the same as the hopper angle on the side of the spiral partition wall 3A having a positive slope. However, it gradually becomes gentler toward the spiral partition wall 3B side, which has a negative slope. In other words, in FIG. 11, only the stored powder material at the corner formed by the vertical inner cylinder wall 2 and the spiral partition wall 3B having a negative slope flows down well at a high descending speed regardless of the height. On the other hand, all of the powder and granules stored in other corners have a lower vertical descent speed than the powder and granules in the corner.
Furthermore, it can be seen that when the residual height is low, the descending speed also decreases. On the other hand, in the case of Fig. 12, the stored powder and granules at each corner are in the
The vertical descent speed is more even than in the case shown in FIG. 11, and even when the residual height is low, the vertical descent speed is faster than in the case shown in FIG. Therefore, as can be seen by comparing these two figures, the flow control plate 14
The installation angle of the storage target powder 12 is delicate.
It changes depending on the situation.

As described above, according to the method of the present invention, a convex, sloped powder flow control plate is extended from the inner cylinder wall side of the helicoidal silo toward the hopper wall side, and the flow control plate and the hopper wall are connected to each other. In between, the stored powder and granules are discharged through the gap formed so that the side of the partition wall that is fan-shaped and has a positive slope is wide and the side of the partition wall that has a negative slope is narrow. What used to be funnel flow discharge can be very easily mass flow discharged.

[Brief explanation of the drawing]

Fig. 1 is a schematic partially cutaway perspective view of the helicoidal silo, Fig. 2 is a partially plan view of the helicoidal silo, Figs. 3 to 5 are drawings for explaining the funnel flow, and Fig. The figure is a schematic plan view,
The figure is a perspective view of one storage chamber, FIG. 5 is a vertical side view of the storage chamber, FIGS. 6 to 12 are drawings for explaining the method of the present invention, and FIG. 6 is a flow control plate installed. Fig. 7 is a longitudinal sectional side view of the same state;
Figure 8 is a diagram showing the gap, Figure 9 is a longitudinal side view of the storage chamber to explain the flow of powder and granules, and Figure 10 is a diagram showing the gap.
Figure a is a plan view for explaining symbols, Figure 10 b is an explanatory diagram of the size of the gap, Figures 11 and 12
The figure shows the relationship between the residual height of powder and the vertical descent speed. 1... Outer cylinder wall, 2... Inner cylinder wall, 3... Spiral partition wall,
5... Hopper part, 14... Powder flow control plate, 1
5...Gap.

Claims (1)

[Claims] 1 In a helicondal type silo that is divided into multiple storage chambers by a spiral partition wall between the inner cylinder and the outer cylinder,
A convex powder flow control plate is extended from the inner cylinder wall side toward the hopper wall, which has a shape constricted from the lower end of the outer cylinder wall toward the inner cylinder wall. A helicoidal silo characterized in that the gap formed between the hopper and the hopper wall is fan-shaped and is wide on the side of the partition wall with a positive slope and narrow on the side of the partition wall with a negative slope. .