JPH0352718Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a blender silo that uniformly mixes and supplies powder and granular materials, and more specifically, the invention relates to a blender silo that uniformly mixes and supplies powder and granular materials, and more specifically, a blender silo that uniformly mixes and supplies powder and granular materials. This invention relates to an outlet structure of a blender silo provided in multiple stages.

[Conventional technology]

BACKGROUND ART Conventionally, there is a blender silo as shown in FIG. 2 as a device for uniformly mixing and supplying powder and granular materials such as two or more types of grains. This type of blender silo is provided with a plurality of inner cylinders 34, 34, . . . coaxially extending upward from the outlet 32 of a cylindrical silo main body 30. The outlet 32 is formed at the center of a hopper part 31 that has a conical saucer shape and is formed so as to gradually narrow the lower end of the silo body 30.
The lower end of the lowermost inner cylinder 34 is located above the outlet 32. Further, an opening is provided between each inner cylinder 34 to allow the powder and granular material to freely enter and exit.

Below the outlet 32, an outlet 32 and an inner cylinder 34 are provided.
An insert cone 36 is provided with its tip slightly inserted into the lower end opening of the insert cone 36. Furthermore, a rotary valve 38 is attached to the outlet 32,
A circulation line 40 is connected to this rotary valve 38.

A separator 42 for removing impurities and the like, and a charging line 44 for charging the material to be fed into the silo main body 30 are attached to the upper part of the silo main body 30. Separator 42 communicates with outlet 32 via circulation line 40 .

The circulation line 40 is connected to a transfer line 48 via a switching valve 46 .

Next, the operation of the conventional blender silo will be explained. A certain amount of one or more types of powder or granules is charged into the silo body 30 from the charging line 44. The powder particles fall while moving in and out between the silo main body 30 and the inner cylinder 34 and inside the inner cylinder 34. The granular material that has fallen to the hopper portion 31 flows out of the silo main body 30 through the space formed between the insert cone 36, the outlet 32, and the lower end opening of the inner cylinder 34.

The outflowing powder flows into the circulation line 40 through the rotary valve 38, is conveyed through the switching valve 46 to the separator 42, and is returned to the silo body 30.
It will be put into the interior and circulated.

After the powder and granules are appropriately circulated and uniformly mixed, the switching valve 46 is switched to the transfer line 48, and the uniformly mixed powder and granules flowing out from the silo body 30 are transferred to a container or the like.

The flow rate from the outlet 30 changes depending on the type of powder and granules, and the optimum circulation speed for mixing also differs. The flow rate is being adjusted.

[Problem that the invention attempts to solve]

In the structure of the conventional blender silo described above, in order to reduce the amount input into the silo body 30 and mix it in a short time, the diameter of the inner cylinder 34 is increased, and the amount of powder and granules flowing inside the inner cylinder 34 is increased. must be larger than the amount of powder flowing between the inner cylinder 34 and the silo body 30. However, if the diameter of the inner cylinder 34 is increased in this way, even if the inner cylinder 34 is moved up and down when the powder or granular material is changed, the opening around the inner cylinder 34 will change depending on the increase or decrease in the opening area of the inner cylinder 34. Since the area also increases or decreases, a problem arises in that the flow rate ratio cannot be adjusted.

The present invention takes the above-mentioned facts into consideration and aims to provide a blender silo discharge port structure that can ensure optimal flow rate adjustment depending on the powder and granular material to be handled.

[Means for solving problems]

In order to achieve the above-mentioned purpose, the present invention is a blender silo in which a plurality of inner cylinders are coaxially provided in multiple stages at the center of the silo body, and the area through which objects can pass in a plane perpendicular to the axis is The receiving hopper includes a hopper part of the silo main body that gradually decreases, and a receiving hopper part connected to the outlet of the hopper part and having the passable area larger than the opening area of the outlet. The section forms a confluence section of materials such as powder and granular materials from outside the inner cylinder and materials such as powder and granules from inside the inner cylinder, and also serves as the inner cylinder at the lowest stage of the multi-stage inner cylinders. The lower end is located below the outlet through the outlet, and a flow rate control member is provided in the hopper portion directly below the inner cylinder so as to be able to move toward and away from the end opening of the inner cylinder. There is.

[Effect]

According to the above configuration, the area of the hopper portion through which objects can pass in a plane perpendicular to the axis gradually decreases along the axial direction, so that the amount of objects flowing out at the outlet is reduced. However, since the lower end of the inner cylinder passes through the outlet and is located below this, the flow of the material flowing out between the outer surface of the inner cylinder and the inner surface of the hopper part is not obstructed. In addition, since the receiving hopper part is connected to the outlet and has the above-mentioned passable object area larger than the opening area of the outlet, the passable object spreads as soon as it passes through the outlet. For this reason, the amount of outflow of the passing material increases, and the amount of outflow is kept constant in this portion.

In this state, by moving the flow rate control member toward and away from the inner cylinder, the flow rate of the passing material from the inner cylinder is changed as appropriate. As a result, the ratio of the amount of material flowing out from the inner cylinder to the amount of material flowing out from around the inner cylinder,
That is, the mixing ratio can be changed easily and reliably. In this regard, when adjusting the flow rate of the passing material flowing between the outer surface of the inner cylinder and the inner surface of the hopper part, the mixed state of the passing material tends to be uneven; Since the amount of material flowing out is adjusted, the mixing state of the material passing through can be made uniform.

Furthermore, as described above, the flow rate control member is provided directly below the inner cylinder, and controls the mixture ratio at a predetermined level by only approaching and leaving the inner cylinder from directly below the inner cylinder, that is, without moving the inner cylinder up or down. Even in a silo where a large load is applied to the inner cylinder due to the filled material passing through, only a small load is applied to the flow rate control member, so the driving force required for its approach and departure movement is small. The mixing ratio of the passing material can be easily and reliably set to a predetermined mixing ratio.

〔Example〕

FIG. 1 is a sectional view showing a main part of an embodiment of the outlet structure of a blender silo according to the present invention. An outlet 12 is formed at the lower end of the conical saucer-shaped hopper portion 10, and an inner cylinder 14 is provided passing through the outlet 12. As is clear from the figure, the lower end of the lowermost inner cylinder 14 among the plurality of inner cylinders 14 is connected to the outlet 12.
It is located below. Although not shown, the silo body continues above the hopper part 10, and a plurality of inner cylinders are provided coaxially above the inner cylinder 14, as in the conventional example.

A receiving hopper part 16 is formed below the hopper part 10 and swells outward from the outlet 12. Due to this swelling, the receiving hopper part 16 has a larger area in a plane perpendicular to its axis through which powder or granules can pass than the opening area of the outlet 12. Further, an insert cone 18 serving as a flow rate control member is installed in the receiving hopper portion 16 directly below the inner cylinder 14 . The insert cone 18 has a conical shape, its center is on the axis of the inner cylinder 14, and is supported by the receiving hopper part 16 via a support member 20. Furthermore, this insert cone 18 is driven by a drive mechanism (not shown) in the axial direction of the inner cylinder 14 so as to be able to move toward and away from the open end of the inner cylinder 14 .

Although not shown, a rotary valve or the like is connected to the attachment portion 22 at the lower end of the receiving hopper portion 16 to form a circulation line, as in the conventional example.

Next, the operation of the discharge port having the above structure will be explained. At the outlet 12, that is, at the portion indicated by line A in the figure, the internal cross-sectional area of the inner tube 14 and the cross-sectional area of the annular portion formed by the outside of the inner tube 14 and the lower edge of the hopper portion 10 are constant. Therefore, when the insert cone 18 is sufficiently far away from the lower end of the inner cylinder 14, the flow rate ratio of the granular material as a passing object passing through both the above-mentioned cross sections is constant, and the flow rate ratio depends on the size of the granular material, etc. depends only on the nature of

When the insert cone 18 is brought close to the inner cylinder 14, the opening of the inner cylinder 14 is narrowed by the conical surface of the insert cone 18, and the amount of powder flowing down inside the inner cylinder 14 is reduced.

However, the annular part around the inner cylinder 14 is once constricted at the line A, but when the powder passes through this, the dynamic pressure applied to the powder is simultaneously released and the insert cone expands. The flow rate in this part is always kept constant without being affected by the flow rate. Therefore, the insert cone 18 and the inner cylinder 1
By adjusting the distance between the inner cylinder 14 and the inner cylinder 14, it is possible to control the ratio between the flow rate of the powder and granular material flowing inside the inner cylinder 14 and the flow rate of the powder and granular material flowing around the inner cylinder 14. According to such a structure, by appropriately changing the distance between the insert cone 18 and the inner cylinder 14, it is possible to always perform reliable mixing.

In this embodiment, a conical insert cone 18 is used, but it may be of any shape such as a hemisphere or a flat plate.

[Effect of idea]

As explained above, the outlet structure of the blender silo according to the present invention is such that the lower end of the inner cylinder penetrates the outlet of the hopper part of the silo body and is located below this, and the inner cylinder is located directly below the inner cylinder. Since the flow rate control member is provided in the cylinder so that it can move toward and away from the cylinder, the ratio of the flow rate of the particles such as powder flowing out from inside the inner cylinder to the flow rate of the flow rate of the flow substances flowing out from around the inner cylinder, that is, the mixing ratio. can be changed easily and reliably.
Moreover, it is possible to make the mixed state of the passing material uniform.

Furthermore, as described above, the flow rate control member is provided directly below the inner cylinder and controls the mixing ratio by approaching and leaving the inner cylinder from directly below the inner cylinder, that is, without moving the inner cylinder up or down. Since it can be set to a predetermined value, only a small load is applied to the flow rate control member, and it is effective even in a silo where a large load is applied to the inner cylinder due to the filled passing material.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view showing a main part of an embodiment of the outlet structure of a blender silo according to the present invention, and FIG. 2 is a cross-sectional view showing an outline of a conventional blender silo. 10... Hopper part, 12... Outlet, 14... Inner cylinder, 16... Receiving hopper part, 18... Insert cone (flow rate control member).

Claims (1)

[Scope of utility model registration request] In a blender silo in which a plurality of inner cylinders are coaxially provided in multiple stages at the center of the silo body, a hopper portion of the silo body has a passable area for passing objects in a plane perpendicular to the axis, which gradually decreases along the axial direction; a receiving hopper part connected to the outlet of the hopper part and having the passable area larger than the opening area of the outlet, and the receiving hopper part receives objects passing from the outside of the inner cylinder. The lower end of the lowermost inner cylinder of the multi-stage inner cylinder penetrates the outlet and is located below this, and the inner cylinder A discharge port structure for a blender silo, characterized in that a flow rate control member is provided in a hopper section directly below the hopper section so as to be able to approach and move away from the end face opening of the inner cylinder.