JP3121183U - Device to eliminate bridging of powder particles - Google Patents

Abstract

An apparatus for eliminating a bridge generated in a silo-type granular material storage tank, having a simple structure, and therefore can be provided easily and at low cost, and can be reliably eliminated, and Provide something that is easy to maintain.
A socket (4) is provided on an inclined wall at the bottom of a silo-type granular material storage tank, and an air blowing pipe (5) capable of moving forward and backward through the socket with respect to the inside of the storage tank is hermetically disposed. To do. At the tip of the pipe is provided an air outlet (51) that opens transversely to the axis of the pipe, the base of the pipe is connected to a compressed air source via a valve (6), and the pipe is connected to the axis. A handle (52) is provided that can be moved in and out and can be rotated about an axis.
[Selection] Figure 2

Description

The present invention relates to a mechanism for preparing for the occurrence of a bridge or a rathole in a container for storing powder particles or a passage for supplying the powder, and to easily eliminate the trouble of discharging caused by them. Since the apparatus of the present invention exhibits its effect best when applied to a silo type granular material storage tank, such a case will be described below as a representative example.

A storage tank for storing various inorganic particles such as slaked lime and cement, or organic particles such as wheat flour, has an inverted conical bottom extending from the bottom of a cylindrical body having a lid, and a rotary valve below it. A structure having a discharge port provided with a screw conveyor is common. Since this type of silo-type granular material storage tank often causes trouble of poor discharge due to the occurrence of bridges and ratholes, various countermeasures have been devised and disclosed.

One type uses porous parts. For example, a porous material is flexibly attached to the inner wall surface of the lower part of the storage tank, and the air between the porous material and the inner wall surface is pressurized. This is a technique of increasing the fluidity of the granular material by reducing the pressure and vibrating the porous material (Patent Document 1). There is also an attempt to do the same thing using a breathable flexible cloth (Patent Document 2). There has also been proposed a powder tank in which a porous body for gas ejection is attached to the tip of a nozzle and dispersed in an inverted conical portion (Patent Document 3).

The other type is a slit that blows out air. A typical example is an air cone that has a number of slits that open downwards at the bottom of an inverted conical shape. This is a mechanism that prevents bridging by blowing out (Patent Document 4).

Yet another type is to blow out gas from the nozzle to break or prevent the bridge of particles, and the most basic aspect of this idea is to blow gas from directly above the outlet (Patent Document 5). On the other hand, an apparatus has also been proposed in which gas is ejected from a gas ejection three-dimensional nozzle to rotate the nozzle and thereby break the bridge (Patent Documents 6 and 7). Further, a nozzle that jets gas in the horizontal direction is rotated horizontally or moved up and down just above the discharge port to widen the gas jet range (patent). Reference 8).
JP 08-002629 A JP 2000-255680 A JP 08-207987 JP-A-10-167380 JP 2000-142989 A JP-A-10-310256 JP-A-11-268792 JP-A-11-165792

The various bridging measures described above are not definitive because the structure is complicated, the effect is not obtained with certainty, or the maintenance is troublesome. Eliminates silo granule storage bridges that have a simpler structure and therefore can be provided easily and at low cost, can reliably eliminate bridges, and are quite easy to maintain This is why there is still a strong demand for a mechanism to do this. The purpose of the present invention is to provide a solution to such a need.

The device for eliminating the bridge in the container for storing the granular material or the passage for supplying it according to the present invention is shown in FIG. 1 as a whole, and in FIG. As shown in detail, a silo type body comprising a cylindrical main body (1) having a lid and an inverted conical bottom (2) having a powder outlet (3) at the bottom and extending downward therefrom. A socket (4) is provided on the inclined wall of the bottom of the powder storage tank, and an air blowing pipe (5) that can be moved forward and backward through the socket is airtightly arranged. Is provided with an air outlet (51) that opens transversely to the axis of the pipe, the base of the pipe is connected to a compressed air source (not shown) via a valve (6), and the pipe is A hand that allows it to move in and out along its axis and to rotate around the axis. Is a device formed by providing a Le (52).

When a bridge is generated inside the powder storage tank, the valve (6) at the base of the pipe (5) is opened to supply compressed air, and air is ejected from the air outlet (51) at the tip of the pipe. If it does, since the bridge | bridging of a granular material will be destroyed and eliminated by the impact of the ejected air, a discharge trouble will disappear. In this operation, the pipe is advanced or retracted toward the inside of the storage tank with the handle (52), and further rotated around the shaft so that a wide space area can be formed from one air jet outlet at the bottom of the storage tank. In addition, since air can be ejected in the direction of 360 degrees, it is possible to easily break any bridge wherever and what is formed.

When the device of the present invention is not in use, the direction in which the air jets open is directed downward, thereby eliminating the possibility of powder particles entering the pipe and closing the pipe. Still, troubles such as blockage may occur, and it may be desired to clean the inside of the pipe. In that case, the pipe can be pulled out and maintenance work can be performed outside the storage tank. Since this apparatus has a simple structure and can be configured without processing inside the powder storage tank, it can be attached to an existing powder storage tank later.

To airtightly arrange the pipe (5) with respect to the bottom wall surface of the granular material storage tank, as shown in FIG. 2, a screw is cut in the socket (4), and a nipple with a screw engaged therewith is cut. It is preferable to adopt a configuration in which an appropriate packing (8) is tightened with the group (7), fixed to the socket in that state, and the pipe (5) is passed therethrough.

The number of pipes to be arranged in the device of the present invention is arbitrary, taking into consideration factors such as the size of the powder storage tank, the shape of the inverted conical part at the bottom, and the ease of occurrence of bridges depending on the type of powder stored Then, the number should be determined. For a relatively small storage tank, it is sufficient to provide a socket for arranging the pipe at only one place on the bottom wall surface. In this case, the length of the pipe should be such that when the pipe is most advanced, its tip can reach close to the opposite wall of the powder storage tank, and the entire area of the bottom with one pipe. Cover.

For a large storage tank, sockets for arranging pipes are provided at a plurality of positions at symmetrical positions on the bottom wall surface, for example, three at intervals of 120 degrees or four at intervals of 90 degrees. In this case, the length of the pipe can cover all regions in the storage tank if the length of the pipe reaches the center of the powder storage tank when the pipe is most advanced.

As described above, the position where the socket is provided is recommended to be approximately three times or more the diameter of the discharge port from the discharge port upward. It is empirically known that setting such a distance allows the air to be blown out close to the position where the bridge is likely to be generated and effective for breaking the formed bridge. If necessary, pipes are arranged in two or three stages in the vertical direction.

The direction in which the pipe advances and retreats with respect to the inside of the storage tank is substantially horizontal in the illustrated example, and this is a typical aspect, but is not limited thereto. For example, if the pipe is perpendicular to the inclined wall at the bottom of the storage tank, the pipe advances and retreats in a direction heading obliquely upward within the storage tank, but that may be used. This aspect has an advantage that the socket can be easily attached to the bottom of the storage tank.

As is apparent from the above description, the device of the present invention is advantageously installed so as to be operated manually. Of course, it can be installed so that it operates automatically, but it is almost determined at the start of discharge that the bridge of the granular material is easily formed. Another meaning of manual operation is that when air is blown out with the intention of breaking the bridge, there is no “response” if the direction of the blow is a hollow part, but when it hits the bridge, the reaction causes vibrations in the pipe. felt. In this way, effective bridge elimination can be realized by manually changing the position and direction of the ejection port in various ways.

As mentioned above, although the apparatus which eliminates the bridge | bridging of this invention was demonstrated taking the example of the silo type granular material storage tank which is the typical application example, this apparatus is not limited to it, and is for supplying granular material. The present invention can also be applied to a passage having a structure that is arranged substantially vertically and in which the powder particles pass by its own weight.

The longitudinal cross-sectional view which shows the whole structure of the granular material storage tank provided with the apparatus which eliminates the bridge | bridging of this invention. The longitudinal cross-sectional view which shows the detail about the principal part of the apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical main body 2 Bottom part of reverse cone 3 Outlet 4 Socket 5 Pipe for air blowing 51 Air outlet 52 Handle 6 Valve 7 Nipple 8 Packing

Claims (6)

A socket is provided on the wall of the container for storing the granular material or the passage for supplying it from the outside, and an air blowing pipe that can be moved forward and backward through the socket to the inside of the container or the passage is airtightly arranged. The pipe tip is provided with an air outlet opening laterally to the axis of the pipe, the base of the pipe is connected to a compressed air source via a valve, and the pipe is moved in and out along the axis. An apparatus for eliminating the bridge of powder particles, which is provided with a handle that is rotatable about an axis. A silo comprising a cylindrical main body (1) having a lid and an inverted conical bottom (2) having a powder outlet (3) at the bottom and having a lid for storing the granular material. A storage tank of a mold, which is provided with a socket (4) on an inclined wall at the bottom, and an air blowing pipe (5) that can be moved forward and backward through the socket and is airtightly arranged at the tip of the pipe Provides an air outlet (51) that opens transversely to the axis of the pipe, the base of the pipe is connected to a compressed air source via a valve (6), and the pipe is moved in and out along that axis. And the apparatus which eliminates the bridge | bridging of the granular material in a granular material storage tank provided with the handle | steering-wheel (52) which enables rotation centering on an axis | shaft. 3. The apparatus according to claim 2, wherein the socket (4) is provided at a position that is approximately three times or more the diameter of the discharge port from the discharge port upward. Device according to claim 1 or 2, wherein the pipe (5) is hermetically arranged by tightening the packing (8) with a nipple (7) meshing with a screw cut in the socket (4). The socket where the pipe is placed so that when the pipe is most advanced, its tip can reach near the opposite wall of the container for storing powder or the passage for feeding The apparatus of Claim 1 or 2 which provided in one place of the exterior. The pipe is long enough to reach the center of the container for storing the powder or the passage for supplying the pipe when the pipe is most advanced, and the socket in which the pipe is placed is placed in an external symmetrical position. The apparatus of Claim 1 or 2 provided in multiple places.

Images