JPH1072124A - Fixed quantity delivery device for tank storing mud or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw type delivery device which can continuously and quantitatively supply mud in a tank of large capacity from the all region of a tank bottom plate to the following treating process by a single shaft delivery device. SOLUTION: The inside of a mud storage tank 1 is provided with a fixed bottom plate 2, a turn barrel part 3 inserted in a central part of the bottom plate to be provided so as to be drive rotated around a tank center axis, a drive casing rotatably driven by a motor, a spiral ribbon type screw 4 fixed to the drive casing to be inserted in the barrel part to protrude to its outside to be assembled so as to turn around a peripheral edge of the bottom plate and a mud discharge port in one end of the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for extracting sludge provided in a storage tank for treating sludge or incinerated ash of municipal sewage, and more particularly to an apparatus for installing sludge in a large storage tank of 100 to 400 cubic meters. The present invention relates to a suitable screw type cutting device. The present invention can be applied not only to the above-mentioned sludge but also to a cutting device provided in a storage tank for storing powder or granules of food, feed, fertilizer, dust, sludge, garbage and the like.

[0002]

2. Description of the Related Art Recently, the amount of generated sludge has increased due to an increase in the size of sewage treatment facilities and the concentration of sludge, and the capacity of sludge storage tanks has also tended to increase. The properties of the sludge in the tank vary greatly depending on the dehydration conditions, season, storage time, etc. Generally, when the storage tank is cylindrical or horn-shaped, when the storage amount increases or the storage time increases, the inside of the tank increases. Since the sludge easily causes a bridge phenomenon and the sludge hardly descends, the actual storage capacity is low and smooth discharge cannot be performed.

When the sludge generated from a sewage treatment facility is sent to a subsequent treatment step, a sludge storage tank is provided between the facilities for storage or relay, in terms of work efficiency of the system.
It is necessary to adjust the operation time before and after, and store the sludge, and supply the sludge in the storage tank continuously and quantitatively to the subsequent processing steps, for example, incinerators, drying plants, compost plants, etc. .

[0004] Therefore, as a sludge discharge device for a storage tank which is required to have such a constant discharge property, a device in which a screw conveyor is installed on a multi-axis so as to cover the entire area of the tank bottom plate is known. The device increases the shape, size, length, number of screw blades, and the direction of rotation,
The number of rotations is adjusted according to the amount of cut-out and sludge properties, and by combining a scraping arm device, constant discharge performance is secured.

[0005]

However, in the conventional storage tank, the weight of the cut-out portion increases as the size of the storage tank increases, and it is necessary to provide a plurality of driving portions. Structure becomes complicated, equipment cost,
There are drawbacks such as high running costs and maintenance costs.

In view of the above, the present invention has been made in view of the above-mentioned conventional problems, and a single-shaft cutting device continuously and quantitatively converts sludge in a tank from the entire area of a large-capacity tank bottom plate. It can be supplied to the subsequent processing steps, and the weight of the cut-out part is reduced by integrating the drive unit, and the structure of the related power unit and control unit is simplified, so that equipment costs, running costs, It is intended to propose a screw type cutting device that is advantageous in terms of maintenance costs.

[0007]

In order to achieve the above-mentioned object, the present invention provides a bottom plate fixed inside a vertical sludge storage tank having a truncated cone, a cylinder or a box, and a bottom plate fixed to the bottom plate. A swivel body provided so as to be rotated around the central axis of the tank through the center, a casing provided in the body, and fixed to the casing, penetrating the body and out of the body. A shaftless shaft that is driven by a motor that protrudes and is built around the periphery of the bottom plate.
A spiral ribbon screw and a sludge discharge port are provided at one end of the casing, and a gate whose opening can be adjusted is provided inside the discharge port.

The spiral ribbon type screw is configured to orbit on the tank bottom plate with the rotation of the rotating body.

The spiral ribbon type screw is provided so as to keep a predetermined clearance from the bottom plate of the tank, and is configured to be driven to rotate reversibly by a motor.

[0010] Further, between the swivelable body and the sludge,
An umbrella-shaped cover that is rotatable relative to the body is provided.

[0011]

[Function] Since sludge has an odor due to its properties, the supply route to the storage tank and the discharge route from the tank must be completely sealed. Therefore, the main drive parts including the power unit and the control unit of the spiral ribbon screw must be operated completely shielded from sludge. According to the present invention, the rotary drive unit can be completely shielded from sludge by the above configuration, and the shield unit can be formed only around the central axis, and the diameter of the shield unit can be reduced and leakage of sludge can be prevented. Can be prevented.

When the sludge in the storage tank is continuously and quantitatively discharged, when the spiral ribbon type screw is rotated (rotated), the sludge in contact with or surrounded by the screw moves in the screw direction, and the cylindrical casing is rotated. Inside, the sludge is pushed out toward the discharge port by receiving the internal pressure of the sludge in the tank and the rotational force of the screw.

The screw and its drive casing rotate together, and the sludge is compacted in the axial direction of the screw with an appropriate degree of tackiness. The consolidation state of the sludge is adjusted by the earth pressure sensor and the opening of the gate, and the sludge is discharged without causing clogging and without discharging the sludge from the discharge port.

When the rotating body is rotated around the center axis of the tank via a motor provided at the lower part of the storage tank, the screw orbits around the tank bottom plate (revolves).
The contents (sludge) of the entire area of the tank bottom plate are sequentially discharged.

Since there is a clearance between the screw and the tank bottom plate, corrosion due to rubbing of the screw and the bottom plate is prevented, and foreign matter mixed in the tank sinks into the clearance at the tank bottom and bites into the screw. It is prevented and does not hinder cutting by the screw.

Further, since an umbrella-shaped cover portion rotatable with respect to the body portion is provided between the swivelable body portion and the sludge, the cover is provided when the screw is driven to rotate. Is not rotated and does not generate a large frictional force between the cutting device and the sludge.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes a frustum-shaped steel or concrete vertical storage tank, which is provided on a bottom plate 2 fixed therein so as to be driven to rotate around the central axis of the tank bottom plate. Turning body 3,
A shaftless spiral ribbon type screw 4 fixed to the body and incorporated around the periphery of the bottom plate is provided, and a part of the body is provided with a discharge port 5 for sludge which passes outside the tank. Are formed. The storage tank may have a cylindrical shape or a box shape instead of the truncated cone shape.

The above-mentioned bottom plate 2 is formed in a conical shape so that the center portion is the deepest, and a turning body portion 3 penetrating through the center portion of the bottom plate and projecting upward is rotated by driving means provided at the lower portion of the tank. It is mounted on a driven horizontal rotating plate 6. The turning body 3 is formed in a cylindrical shape, and an umbrella-shaped cover 7 that is rotatable relative to the main body is attached to the upper part of the main body. Although the bottom plate is formed in a conical shape in the drawing, it may be formed flat.

The spiral ribbon type screw 4 is provided in a casing 8 which is fixed to the swivel body 3 and is provided so as to pass through the inside and outside of the body. The casing 8 is shown in FIG.
The drive casing 8 which is formed in a cylindrical shape as shown in FIG.
b. An outer peripheral portion of one end of the ribbon screw 9 is fixed to the drive casing 8b.
The other end protrudes from the revolving drum 3 to the outside of the drum portion, and is attached to the bottom plate 2 so as to orbit around the shelf 10 formed in an annular shape at the peripheral edge of the bottom plate 2. Note that one end of the drive side of the ribbon screw 9 is fixed to a drive casing provided inside the revolving body 3, but as shown by the phantom line in FIG. It may be.

The other end of the ribbon screw 9 is formed so as to be free and orbit on the bottom plate 2.
From the bottom plate 2 inclined by 0, it is supported so as to keep a constant clearance of about 100 to 150 mm,
This prevents the bottom plate from being corroded by rubbing with the screw 9, and even if hard foreign substances such as wires, cans, stones, etc. are mixed in the tank, the foreign substances sink into the clearance, so that biting into the screw is prevented. It is prevented and does not hinder cutting by the screw. However, these are not indispensable to the present invention, and when there is no entry of foreign matter that hinders cutting, when the screw length is short, or the like, it is not necessary to provide a shelf or a clearance. The foreign matter is discharged from a separately provided cleaning port (not shown).

Next, the drive mechanism of the rotating body 3 and the drive mechanism of the ribbon screw 9 will be described with reference to FIGS. First, the revolving trunk 3 will be described. A disk (horizontal rotating plate) 6 that horizontally rotates via a slip ring 11 and a group of guide rollers 12a and 12b is mounted on a frame 23 of the tank 1. The disk 6 has a revolving body 3 with a spiral ribbon screw 4 mounted on the upper surface.
Is fixed, and an opening 13 is provided, and the sludge discharge port 5 provided at one end of the casing is connected to a pipe 14.
This disk 6 has a sprocket 15a and a chain 15b.
The rotation of the motor is reduced and transmitted to the disk 6 by way of a motor, and as an example, the motor is rotated continuously or intermittently at a rate of several rotations per 24 hours. In the figure, the horizontal rotating plate 6 is driven by a chain, but may be driven by a belt or a gear.

One end of the ribbon screw 9 is fixed to the drive casing 8b provided in the turning body 3 as described above. The casing 8b is rotatably driven by a speed reducer 18 and a reversible motor 19 via a drive gear 17 fixed to the outer periphery as shown in the figure. A discharge port 5 for sludge is formed at one end of the cylindrical casing 8a on the discharge side, and a guillotine-shaped gate 20, for example, is provided inside the discharge port 5 to adjust the opening degree. The gate is adapted to adjust the opening of the discharge port by a hydraulically driven jack 21. Reference numeral 22 denotes an earth pressure sensor attached to the casing 8, and as shown in FIG. 6, the sensing unit is attached to the inside of the casing 8a so as not to contact the screw 9, and the pressure density of the earth pressure in the cylindrical casing is reduced. Measure.
When the earth pressure in the casing becomes high and there is a possibility of causing blockage in the casing, the rotation direction and the number of rotations of the ribbon screw 9 are appropriately reversed by a reversible motor 19 via a control device (not shown). To adjust.

Next, an example of the specification of the ribbon screw will be described. Cutting amount 2.0T / H Screw blade φ350 × P210 Rotation speed 3.0rpm

According to the apparatus of the present invention, when the sludge in the storage tank is discharged, when the spiral ribbon type screw is rotated (rotated), the sludge in contact with or surrounded by the screw moves in the screw direction, Sludge discharge port 5 which is transferred inside the cylindrical casing of the revolving barrel and is provided on the discharge side
Is discharged under atmospheric pressure. Since the revolving drum 3 rotates around the central axis of the tank bottom plate, the ribbon screw 9 fixed thereto is located in the tank from the revolving drum to the tip,
As the revolving drum rotates, it revolves (revolves) on the tank bottom plate, and sequentially transfers the high-moisture content (sludge) to the center.

[0025]

As described above, according to the present invention, the sludge in the tank can be continuously and quantitatively supplied from the whole area of the tank bottom plate to the subsequent processing step by the single-shaft cutting device. Things. In addition, the present invention can reduce the weight of the cut-out portion by simplifying the structure of the related power device and control device by arranging the drive portion of the cut-out device at one central portion, so that equipment cost, running cost, There is an advantage in terms of maintenance costs. Further, according to the present invention, the consolidation state of the sludge introduced into the revolving drum can be adjusted by the earth pressure sensor and the opening of the gate, and the contents can be discharged without being ejected from the discharge port. Further, according to the present invention, the rotation drive unit can be completely closed from the discharge (sludge) by the above configuration,
In addition, the shield portion is formed only around the central axis, which can be reduced in diameter, and can prevent leakage of sludge. Further, in the present invention, since there is a clearance between the screw and the tank bottom plate, corrosion due to rubbing of the screw and the bottom plate is prevented, and foreign matter mixed in the tank sinks into the clearance at the tank bottom and bites into the screw. It is prevented and does not hinder cutting by the screw. Also, between the swivelable trunk and sludge,
Since the cover portion having an umbrella shape that is rotatable relative to the body portion is provided, when the screw is driven to rotate, the cover is not rotated, and between the cutting device and the sludge. There is also an advantage that a large frictional force is not generated.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a sludge storage tank provided with a cutting device of the present invention.

FIG. 2 is a schematic plan view taken along the line A of FIG.

FIG. 3 is an enlarged view of a cutting device.

FIG. 4 is a plan view showing a driving mechanism of the swing body.

FIG. 5 is a schematic perspective view of the same.

FIG. 6 is a perspective view showing a screw provided inside a cylindrical casing and an earth pressure sensor attached to the casing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sludge storage tank 2 Bottom plate 3 Revolving trunk part 4 Spiral ribbon screw 5 Discharge port 6 Horizontal rotating body (disk) 7 Umbrella-shaped cover 8 Cylindrical casing 9 Ribbon screw 10 Sheath plate 11 Slip ring 12 Guide roller 13 Opening 14 Pipe 15a Sprocket 15b Chain 16 Reversible motor for turning 17 Drive gear 18 Reduction gear 19 Reversible motor for screw 20 Gate 21 Hydraulic jack 22 Earth pressure sensor 23 Mount

Claims (7)

[Claims] A swiveling body provided inside a vertical storage tank so as to be driven to rotate around a central axis of a tank bottom plate;
A shaftless spiral ribbon screw screw fixed to the body, penetrating the body, projecting out of the body, and being incorporated around the periphery of the bottom plate; A fixed-quantity cutting device for a storage tank for sludge or the like, characterized by having a discharge port. 2. A fixed bottom plate inside a vertical storage tank, a swirling body portion provided to penetrate a center portion of the bottom plate and to be driven to rotate around a tank central axis, and inside the body portion. A casing provided, a shaftless spiral ribbon type screw fixed to the casing, protruding out of the body through the body, and driven to rotate by a motor incorporated so as to orbit around the periphery of the bottom plate; A sludge discharge port is provided at one end of the casing, and a gate capable of adjusting an opening degree is provided inside the discharge port; 3. The fixed quantity cutting device according to claim 1, wherein the spiral ribbon type screw is configured to orbit on a tank bottom plate with rotation of the rotating body. 4. The fixed quantity according to claim 1, wherein the spiral ribbon screw is installed so as to maintain a predetermined clearance between the screw and a bottom plate of the tank, and is driven to rotate reversibly by a motor. Cutting device. 5. The umbrella-shaped cover portion rotatable relative to the body portion is provided between the swivelable body portion and the sludge. Quantitative extraction device. 6. The sensor of the earth pressure sensor is attached to the inside of the casing so as not to be in contact with the screw, and the earth pressure in the cylindrical casing is measured. The quantitative cutout apparatus according to any one of claims 2 to 4, wherein the apparatus is configured to adjust a rotation speed. 7. The discharge port according to claim 1, wherein a gate for adjusting the opening degree is provided inside the discharge port, and the gate adjusts the opening degree of the discharge port by hydraulic means. 2. The quantitative extraction device according to 1.