JPH07108729B2 - Method and device for discharging powder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a method for discharging a granular material and an apparatus therefor, particularly for discharging a stored material from within a granular silo such as a large cement. The present invention relates to a method for discharging powder and granular material and its apparatus.

(Prior Art) Powders, such as cement, are generally stored in silos, and there are various problems in discharging cement and the like from inside the silo.

First, since the object to be stored is a granular material and its characteristics change due to aging, etc., in the case of cement etc. which are sequentially deposited from the bottom of the silo and stored,
It is necessary to be able to discharge all from the bottom. Various proposals have hitherto been made to meet these demands.

FIG. 6 is a diagram showing a configuration example showing a conventional method (Japanese Patent Laid-Open No. 59-15 / 1984).
No. 2179), this will be explained. In the silo main body 1, a base 2 is formed so that the bottom plate is the lowest point in the center, a pit 3 is provided in the center, and a conveyor 4 is provided inside the pit 3.
One or a plurality of linear paddles 5 extending radially from the center almost contacting the upper surface of the foundation 2 of the silo body 1 are provided, and the outer peripheral portion of each paddle is arranged along the peripheral wall of the silo body 1. Further, the rack-combined ring 6 is connected, and the pinion 7 that engages with the rack-combined ring 6 is formed by providing a notch in the peripheral wall of the silo body 1 and is driven by the electric motor 8 and the speed reducer 9. .

When discharging the stored material 10, the electric motor 8
To rotate the pinion 7 via the speed reducer 9, and further rotate the paddle 5 via the rack / ring 6 as well.
As a result, the stored material 10 is forcibly urged by the rotation of the paddle 5 to move to the lowest portion, and is discharged to the outside via the conveyor 4.

(Problems to be Solved by the Invention) In the above conventional method, a paddle is provided in the silo body 1,
This has to be rotated, and in view of the weight of the stored deposits, it requires a lot of energy. Along with that, it is structurally complicated, and since the paddle itself is inside the silo, maintenance and inspection of these is not easy.

Therefore, when the paddle is in a failure state, it becomes difficult to completely discharge the stored material, and dead stock is formed on the inner peripheral edge.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a discharging method of powdery particles and a device thereof which has a large volume, requires little power for discharging, and has no dead stock. I am trying.

[Structure of the Invention] (Means for Solving the Problems) The first invention of the present invention is a method invention, and as shown in FIG. 1, through a central cone portion 12 provided in a silo cylinder. Center discharge through the central discharge port 13 and discharge around the silo by the discharge chute 15 around the silo.

The second invention of the present invention is an apparatus for carrying out the method of the first invention, wherein a central cone portion 12 is provided at the bottom of the silo, and the lowermost portion of the inner inclined surface is opened to the central discharge port 13, and the outer inclined surface is Peripheral air slides 14 are provided at the lowermost peripheral edge position, and discharge chutes 15 are provided at a plurality of locations on the peripheral air slides 14 to connect to an outer peripheral transportation machine 17 provided outside the silo, and the central discharge port is provided.
A central discharge transporting machine 18 via 13 and the outer peripheral transporting machine 17 are connected at the central position of the outer periphery of the silo.

(Operation) The powders and granules due to their own weight are distributed to the central part and the peripheral part by the central cone part 12, the central part is collected by the central discharge port 13 and the central discharge transport machine 18, and the peripheral part is the peripheral air slide 14
The discharge chute 15 temporarily collects the waste on the outer peripheral transporter 17, and then the central discharge transporter 18 and the outer peripheral transporter 17 are merged and discharged.

(Examples) Examples will be described below with reference to the drawings.

FIG. 1 is a perspective configuration diagram of a silo of an embodiment for explaining a discharging method of powdery or granular material and an apparatus therefor according to the present invention, and FIG. 2 is a plan view of a bottom surface of the silo.

In Fig. 1 and Fig. 2, 11 is a silo cylinder whose diameter becomes slightly larger from the upper side to the lower side, and 12 is a central cone portion provided on the bottom surface of the silo cylinder, which is a volcanic caldera-type crater. It resembles an outer ring, and the angle θ of these chevrons is 50 ° to 100 °.

A central outlet 13 is provided at the center of the central cone.
A peripheral air slide 14 is provided on the peripheral edge of the central cone portion on the silo cylinder side.

That is, with the peripheral edge of the summit of the central cone portion 12 as a watershed, the central discharge by the central discharge port 13 and the peripheral discharge by the air slide by the peripheral foot position are performed. Peripheral air slide 14
Are connected to discharge chutes 15 provided at equal intervals on the periphery of the silo cylinder, and each discharge chute 15 is connected to an air slide 17 of an outer peripheral transport machine provided on the outer circumference of the silo cylinder via a flow rate adjuster 16. It is in communication.

Although there are chain conveyors, screw conveyors, and the like as transportation machines at the outer periphery and the central discharge portion, an air slide is used in this embodiment. A central tunnel 19 is provided at a diameter position below the silo cylinder, and a central discharge air slide 18 is provided in the tunnel.

Then, tunnel end discharge ports 20 and 20-1 are provided at the joint position between the center discharge air slide 18 and the silo cylinder 11, and each discharge port communicates with the center discharge air slide 18 ( (See FIG. 3 cross section).

Then, as shown in FIG. 2, the central exhaust air slide
The outer peripheral air slide 18 and the outer peripheral air slide 17 join together and are connected to the bucket elevator 21.

FIG. 4 is a sectional view taken along line XX of FIG. 2, showing a connection state from the peripheral air slide 14 inside the silo to the outer peripheral air slide 17. FIG. 5 (a) shows the peripheral air slide from above. 5B is a partial view seen from the outside of the silo cylinder as shown in FIG. 5A.
(B) is shown correspondingly. As shown in FIG. 5 (b), the peripheral air slide 14 has a negative slope θ ₁ on the left and right with the middle position of the peripheral discharge chute 15 as the apex 22.
This angle is about 4 to 30 degrees.

Therefore, the granular material deposited on this portion is distributed in the left and right arrow A and B directions with the apex 22 as a boundary, and collected on the exhaust air slide 14-1.

On the other hand, the air slide 14-1 for discharge also has a slope of 4 ° to 30 °, so that it is thrown into the discharge chute 15 through this. The outer peripheral transport aircraft air slide 17 connected to the discharge chute 15 also has a slope of θ ₂ toward the tunnel end discharge port 20-2, and this angle is 4 ° to 15 °.

As is well known, the air slide has a canvas inside the case, and by supplying air from below,
The placed powder and granulate is fluidized and conveyed.

Therefore, as shown in FIG. 4, an air supply chamber 24 is provided below the canvas 23, and an air supply pipe 25 is further provided as shown in FIG. 5 (b). In addition, 26 is an opening / closing gate.

As is apparent from the above configuration, in the present invention, when discharging the weight of the granular material, it is divided into the central portion discharge with the peripheral watershed by the central cone portion and the silo peripheral discharge by the skirt of the cone portion. It was done.

A series of operations will be described below. As shown in FIG. 1, the powder or granular material stored in the silo cylinder 11 is always weighted in the direction of the arrow.

In this state, when the central discharge port 13 and the opening / closing gate 26 at a predetermined position are opened, the granular material accumulated in the silo cylinder falls and moves by its own weight. At this time, the peripheral cone of the central cone portion 12 distributes the central cone portion 12 toward the central portion and the peripheral portion, and the central cone portion 12 moves in accordance with the gradient. In this case, the particles in the direction of the central portion are dropped through the central outlet 13 onto the air slide 18 of the central discharge transport machine in the central tunnel 19, which follows the above-mentioned gradient to the tunnel end outlet 20-2. Be carried to the side.

On the other hand, the granular material distributed in the peripheral edge direction of the central cone portion 12 moves in the skirt direction according to the gradient of the central cone portion, but in this case, the granular material is activated by the operation of the peripheral air slide 14 at the skirt position. Fluidized and open discharge chute
It moves in 15 directions and is carried into the outer peripheral air slide 17. Then, according to the gradient of the air slide 17 of the outer peripheral transport machine, join at the tunnel end discharge port 20-2 side,
Finally, it is transported by the bucket elevator 21.

In this case, in order to uniformly discharge the stored powder and granules in order from the old one, it is necessary to predetermine the opening order of the plurality of discharge chutes, and further, the combination of opening the discharge chutes at each position. Should be decided as a sequence.

In addition, the area ratio of the central part discharge of the granular material and the peripheral part discharge is
The central portion is 20 to 50%, and in the case of cement, around 30% is considered optimal.

[Effects of the Invention] As described above, according to the present invention, the central cone portion is provided at the bottom of the silo cylinder, and the stored powder and granules are divided into the central portion discharge and the silo peripheral portion discharge. Since it is carried by, the power required for discharging is small, dead stock is not generated, and complete discharging is possible.

Further, since the shape of the silo is increased downward, the powder particles can be easily discharged by its own weight, and the volume can be increased, so that the height of the silo can be reduced. This silo shape allows the contents to be supported directly on the ground, which allows economical design of the foundation and tubular structure.

[Brief description of drawings]

FIG. 1 is a perspective configuration diagram of an embodiment for explaining a method and apparatus for discharging powder particles according to the present invention, FIG. 2 is a plan view of the bottom of a silo, and FIG. 3 is a center discharge air slide. 4 is a partial sectional view of FIG. 4, FIG. 4 is a sectional view taken along line XX of FIG.
FIG. 6 is a diagram for explaining the peripheral air slide, and FIG. 6 is a diagram for explaining the conventional method. 1 ... Silo body, 2 ... Foundation 3 ... Pit, 4 ... Conveyor 5 ... Paddle, 6 ... Rack combined ring 7 ... Pinion, 8 ... Electric motor 9 ... Reducer, 10 ... Storage Object 11 …… Silo cylinder, 12 …… Center cone part 13 …… Center discharge port, 14 …… Peripheral air slide 14-1 …… Discharge air slide 15 …… Discharge chute, 16 …… Flow adjuster 17… Outer peripheral transporter (air slide) 18 Central exhaust transporter (air slide) 19 Central tunnel 20, 20-1, 20-2 ...... Tunnel end outlet 21 ...... Bucket elevator 22 ...... Apex , 23 ... canvas 24 ... air supply chamber, 25 ... air supply pipe 26 ... open / close gate

Claims (2)

[Claims] 1. A method of discharging a granular material stored in a silo cylinder, wherein the granular material is discharged to the outside of the silo by its own weight,
Using the central cone provided at the center of the bottom of the silo cylinder to discharge the central part from the central outlet, and using the inclined surface from the circular top position of the central cone to the base of the silo cylinder, the silo cylinder Discharge method of powder and granules, characterized in that it is divided into a peripheral part discharge from the lower part toward the outside and a peripheral part discharge from multiple places respectively. 2. A silo cylinder, a roof and a bottom,
In a silo that discharges powder and granules from a discharge port provided at the bottom, a central cone portion that opens to the central discharge port at the bottom of the silo and a circular top position of the central cone portion extends from the starting point to the front edge of the base of the silo cylinder Connected to each other, an air slide provided in a predetermined width portion between the inclined surface and the peripheral edge of the base, and a plurality of discharge chutes provided from the air slide toward the outside of the silo cylinder, An outer peripheral transporting machine in which the respective discharge chutes are connected, and a central discharging transporting machine provided corresponding to the central discharge port and the outer peripheral transporting machine are joined at a central position of the outer lower part of the silo, Silo to do.