JP3015925B2 - Discharge method and discharge device for sludge stored in hopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to sludge (especially sewage sludge).
The present invention relates to a method and an apparatus for discharging sludge stored in a hopper for storing and transporting sludge.

[0002]

2. Description of the Related Art Generally, there is a storage hopper and a discharge device for storing and transporting powdery substances, various kinds of dust, sludge, and the like. In the storage hopper and the discharge device, powdery substances, various kinds of dust, sludge, and the like are shelved in the storage hopper or clogged in the storage hopper. Therefore, conventionally, in order to solve these problems, for example, as disclosed in Japanese Utility Model Laid-Open Publication No. 50-127177, air is blown into the upper portion of the discharge device in the lower portion of the storage hopper to stably flow the stored material. Discharging mechanism,
Alternatively, Japanese Unexamined Patent Publication No. Sho.
As shown in JP-A-74482, JP-A-55-56287, etc., the operating pieces provided in the storage hopper are alternately moved, or the shelving or the storage hopper is clogged by a stone box extending into the storage hopper. To solve this problem, it has been proposed to prevent the hopper from clogging by dispersing the fitting holes in the peripheral wall of the storage hopper and displacing the pushing element into and out of the hopper in the fitting holes.

[0003]

However, the above-mentioned shelving of the storage hopper and prevention of clogging of the hopper have the following problems. First, in the air flow caused by air blowing, shelving and clogging of the hopper cannot be reliably prevented, and pulsation of the discharged material due to the air flow occurs, and fluctuations in the discharged amount cannot be avoided. In addition, the means for causing the push-out element to move into and out of the ston box and the hopper can substantially eliminate shelving and clogging of the hopper. However, when the discharging device is a screw conveyor, a paddle screw conveyor, or a ribbon screw conveyor (hereinafter simply referred to as a screw conveyor), the material of the screw conveyor is not limited even if the storage hopper is simply shelved or prevented from clogging due to the structure of the screw conveyor itself. Is easily generated at the inflow portion of the screw, and the storage material cannot be continuously supplied into the screw and cannot be discharged. Further, there is a problem that the storage material is filled between the spiral blades of the screw conveyor, and the screw runs idle in this state, and the storage material itself cannot be discharged. The present invention solves the problems inherent to the discharge device that cannot be solved by the conventional shelving and hopper clogging prevention, such as the shelving in the immediate vicinity of the discharging device, and the inability to discharge due to the idle rotation of the storage material between the spiral blades of the screw conveyor. In addition to the stable discharge of storage material, the angle of repose of the storage hopper itself can be made smaller than the required angle of repose of the material, and the hopper capacity can be increased. It is an object of the present invention to provide a method and an apparatus for discharging sludge stored in a hopper, which can supply a stable amount of sludge.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The method of discharging sludge for storage in the hopper according to the description, when discharging the stored sludge via at least one screw conveyor provided at the lower part of the storage hopper, slides at least a part of the bottom plate surface of the storage hopper. Meanwhile, the front-side pushing surface of the pushing plate for forcibly pushing the sludge into the screw conveyor is orthogonal to the front-rear movement direction of the pushing plate, and the shaft of the screw conveyor extends in the entire forward direction of the front-side pushing surface of the pushing plate. Position your body,
The pushing plate pushes the sludge toward the shaft of the screw conveyor. Further, in the apparatus for discharging sludge stored in a hopper according to claim 2, at least one screw conveyor is provided at a lower portion of the storage hopper, and a push plate is slidably disposed on a bottom plate of the storage hopper. In the sludge discharge device for storage in a hopper, which is provided so as to be able to move back and forth toward the shaft of the screw conveyor, the front-side pressing surface of the pushing plate is arranged orthogonal to the longitudinal movement direction of the pushing plate, and The shaft of the screw conveyor is located in the entire frontward pushing surface of the pushing plate in the forward direction.

[0005]

The operation of the method and apparatus for discharging sludge stored in a hopper according to the present invention will be described below. When storing and transporting powdery materials, various types of dust, sludge, etc., screw conveyors have the advantage of stable fixed-quantity cutting and the ability to take out the cutout in the longitudinal direction of the storage hopper, etc. On the other hand, the screw conveyor rotates and conveys and discharges the sludge while filling between the spiral blades. Therefore, when the viscosity becomes a certain level, the material in the hopper is easily densified due to the resistance between the sludge and the spiral blades. In the present invention, these phenomena could be found through experiments using various materials and analysis of the phenomena. As a result, it has been clarified that the conventional simple shelving and conveyance and discharge for preventing clogging of the hopper cannot be carried out by taking advantage of the advantages of the screw conveyor. The present invention has been made based on these findings, and when discharging sludge through at least one screw conveyor provided at the lower part of the storage hopper, while sliding at least a part of the area of the bottom plate surface of the storage hopper, the screw The front-side pressing surface of the pressing plate for forcibly pressing the sludge into the conveyor is orthogonal to the longitudinal movement direction of the pressing plate, and the shaft of the screw conveyor is positioned in the entire forward direction of the pressing-side pressing surface of the pressing plate. Therefore, the sludge pushed by the pushing plate is pushed straight toward the screw conveyor, and the pushed sludge is more efficiently discharged by the screw conveyor.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 shows an overall view of the present invention, and FIG.
FIG. 3 is a sectional view taken along a line BB in FIG. 2. First, 1 is a storage hopper and 2 is a storage hopper 1
Is a screw conveyor provided at the bottom of the storage hopper 1 for discharging sludge, 3 is a sludge pushing device provided on the bottom plate below the storage hopper 1, and 4 is a cylinder which reciprocates the pushing device 3. In addition, the pushing device 3 is formed by integrating the pushing plate 5 into a well shape with the connecting rod 6,
Further, the pushing device 3 is fixedly provided with a lifting prevention plate 8 which is engaged with a guide 7 provided on a bottom plate below the storage hopper 1 and is slidably slidable. The pushing plate 5 is pushed in as shown in FIG. Although it is formed in a triangular shape with an acute angle in a direction opposite to the direction, the front-side pressing surface 5a of the pressing plate 5 is orthogonal to the longitudinal movement direction of the pressing plate 5, and furthermore, the front-side pressing surface 5a
Is extended in the direction of the screw conveyor 2, it is within the diameter of the shaft 2 a of the screw conveyor 2. In other words, the screw conveyor 2 extends over the entire forward direction of the front-side pressing surface 5a.
Shaft 2a.

[0007] The present invention having the above-described structure is a storage hopper 1.
Is discharged by the screw conveyor 2.
At the time of this discharge, the sludge sticks near the discharge port due to viscosity. Due to the shelving, sludge cannot be supplied into the screw conveyor 2, and the inside of the screw conveyor 2 becomes hollow. At this point, the screw conveyor 2 does not reduce the discharge amount or discharge itself. Then, when the sludge is extruded toward the screw conveyor 2 at a predetermined stroke by the cylinder 4 reciprocating the pushing device 3, the shelves on the upper side of the storage hopper 1 are disintegrated and the shelves are disintegrated near the discharge port and the screw conveyor 2 is disassembled. The forced discharge of sludge into the inside recovers a stable discharge amount of the screw conveyor 2. The reciprocating movement of the pushing device 3 can be appropriately performed according to the discharge state of the screw conveyor 2. After the push-in device 3 is pushed in, the push-in plate 5 is returned to its original position. However, as shown in FIG. 2, the push-in plate 5 has an acute triangular shape in the direction opposite to the push-in direction. Easy return. Naturally, the push-in plate 5 can be freely slid, reciprocated, and stably cut open in the material by the guide 7 and the floating prevention plate 8 provided on the bottom plate of the storage hopper 1.

Further, a so-called roll phenomenon occurs in which material is not supplied and discharged into the screw conveyor 2 in a state where sludge is filled between the spiral blades of the screw conveyor 2.
When this rolling phenomenon occurs, the material in the screw conveyor 2 can be discharged by the forced repulsion larger than the sludge resistance between the spiral blades of the screw conveyor 2 by the reciprocating motion of the pushing device 3 as described above. For this reason, the angle of repose of the bottom plate of the storage hopper 1 may be flat, but preferably 10 degrees or more is sufficient, and the capacity can be greatly increased as compared with a storage hopper having the same height. It is to be noted that a more preferable result can be obtained by directing the push plate 5 in the reciprocating direction by directing substantially the axis of the screw conveyor 2 in order to supply the material to the screw conveyor 2 accurately.

Next, an example in which an experiment was conducted using the apparatus for discharging sludge stored in a hopper according to the above embodiment will be described below. A double screw conveyor was provided at the bottom of the hopper storing 50 tons of sludge sludge, the bottom plate was set at a repose angle of 15 degrees, and the bottom plate was provided with two pushing devices to perform a discharge test. As a result, a rolling phenomenon occurred early, and the rolling phenomenon was eliminated by the reciprocating motion of the pushing device a plurality of times.
However, sludge could not be supplied into the screw conveyor in the middle, and cavitation occurred in the screw conveyor. However, this was also solved by a plurality of reciprocating motions of the pushing device, and stable material discharge was possible.

[0010]

As is apparent from the above description, the method and apparatus for discharging sludge stored in a hopper according to claims 1 and 2 disintegrate shelves, prevent cavitation of a screw conveyor, and improve the performance of screws. The rolled phenomenon of the conveyor was prevented, and excellent effects such as stable discharge of sludge and a large capacity increase of the storage hopper were obtained.

[Brief description of the drawings]

FIG. 1 is an overall plan view of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along a line BB in FIG. 2;

[Explanation of symbols]

1: Storage hopper, 2: Screw conveyor, 2a: Shaft, 3: Pushing device, 4: Cylinder, 5: Pushing plate, 5a: Front side pushing surface, 6: Connecting rod, 7: Guide, 8: Floating prevention plate

Claims (2)

(57) [Claims] When discharging the stored sludge via at least one screw conveyor provided at a lower portion of a storage hopper, the screw conveyor conveys the sludge while sliding at least partially through a bottom plate surface of the storage hopper. The front-side pushing surface of the pushing plate forcibly pushing the sludge is perpendicular to the front-rear movement direction of the pushing plate, and the shaft of the screw conveyor is positioned in the entire forward direction of the front-side pushing surface of the pushing plate. A method of discharging sludge stored in a hopper, wherein the sludge is pushed toward a shaft of the screw conveyor by a plate. 2. At least one screw conveyor is provided at a lower portion of the storage hopper, and a pushing plate is slidably disposed on a bottom plate of the storage hopper, and the pushing plate is moved back and forth toward a shaft of the screw conveyor. In the discharge device for sludge stored in a hopper freely provided, a front-side pushing surface of the pushing plate is disposed orthogonally to a forward and backward movement direction of the pushing plate, and furthermore, a forward direction of the front-side pushing surface of the pushing plate. An apparatus for discharging sludge stored in a hopper, wherein a shaft body of the screw conveyor is located as a whole.