JP2000255788A - Dehydrated sludge storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an installation space in dehydrated sludge storage device having a slide frame as compared to before. SOLUTION: This dehydrated sludge storage device has a storage tank 2, a sludge discharge means 3, and a dehydrated sludge stirring device including a slide frame 4 for reciprocating on a storage tank bottom plate 2 with sliding to stir dehydrated sludge within the storage tank 2 in time of discharging the dehydrated sludge. The dehydrated sludge stirring device has a forward moving wire 11A connected to the slide frame 4; a forward moving pulley 12A for changing a tractional direction of the wire 11A by 90 degrees halfway; a forward moving hydraulic cylinder 13A for pulling the direction-changed forward moving wire 11A; a backward moving wire 11B connected to the slide frame 4; a backward moving pulley 12B for changing a tractional direction of the wire 11B by 90 degrees halfway; and a backward moving hydraulic cylinder 13B for pulling the direction-changed backward moving wire 11B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dewatered sludge storage device for storing and discharging solid dewatered sludge (dewatered cake) obtained by dewatering sewage sludge, and more particularly, to reciprocatingly agitating dewatered sludge in a storage tank. The present invention relates to a dewatered sludge storage device having a sliding frame.

[0002]

2. Description of the Related Art Sewage sludge is forcibly dewatered by a dehydrator such as a filter press, a vacuum dehydrator, and a belt press to form solid dehydrated sludge having a water content of about 60 to 80%. Is done. In the sludge treatment process, the dewatered sludge storage device dries the dewatered sludge from the dehydrator,
When transported to the next process such as incineration, composting, landfill disposal, etc., it serves as a front and rear capacity adjustment facility. This dewatered sludge storage device is provided with a storage tank called a silo or a hopper installed on a gantry, a sludge discharge means composed of, for example, a cutting screw for discharging dewatered sludge to the outside of the storage tank, and a dewatered sludge stirring device. And
The dewatered sludge from the dehydrator is temporarily stored in a storage tank, and the dewatered sludge is discharged out of the storage tank to be sent to, for example, an incinerator.

The dehydrated sludge introduced into the storage tank will be briefly described. Lime-based (inorganic) dehydrated sludge uses slaked lime or the like as a dehydration aid (conditioning agent) in the sludge dewatering step. The individual appearance is a small piece of wood (for example, a thickness of about 10 to 20 mm and a size of 100 to 150
mm). In addition, polymer-based (organic) dewatered sludge uses an organic dehydration aid, each of which has the appearance of a small mass (for example, about 100 to 150 mm) of clay. ing.

In such a dewatered sludge storage device, when the dewatered sludge is discharged, the cutting screw disposed at the bottom of the storage tank is rotated to drive the dewatered sludge in the storage tank first. It falls into the screw in order from the left, and is discharged out of the storage tank. When discharging the dewatered sludge, the dewatered sludge is stirred in order to destroy the bridging in order to prevent the dewatered sludge from causing so-called bridging (bridging phenomenon) in the storage tank and falling and moving into the cutting screw. The dewatered sludge is stirred by the device.

There are two types of dewatered sludge stirring devices for stirring the dewatered sludge: a rotary arm type and a slide frame type (slider type). The rotating arm type dewatered sludge stirring device has two rotating arms extending radially around the center axis of the storage tank at the bottom of the storage tank, and these rotating arms slowly rotate on the bottom plate of the storage tank. The dewatered sludge is stirred. This rotating arm type stirring device is
Although the rotating arm requires a large torque due to its cantilever structure and is not suitable for large-capacity storage tanks, actuators such as hydraulic motors and reduction gears for driving the rotating arm are installed in the empty space below the storage tank. There is an advantage that it can be installed.

On the other hand, the slide frame type dewatered sludge stirring device has a slide frame at the bottom of the storage tank, and the slide frame slowly reciprocates while sliding on the bottom plate of the storage tank to stir the dewatered sludge. It was made. FIG. 4 is a partially cutaway perspective view showing a schematic configuration of a conventional dewatered sludge storage device having a slide frame.

As shown in FIG. 4, the conventional dewatered sludge storage apparatus is provided on the gantry 1 with (a) a gantry 1 and (b) a cylindrical or frustoconical (conical) shape with a circular cross section. Steel tank 2 and (c) cut-out as a sludge discharge means disposed below the bottom plate 2a facing the sludge discharge port 2b of the bottom plate 2a of the storage tank and discharging the dehydrated sludge outside the storage tank 2. A screw (not shown) and (d) sliding on the storage tank bottom plate 2a, and reciprocating in a direction perpendicular to the direction in which the sludge discharge port 2b extends (the dewatered sludge discharge direction), to move the dewatered sludge in the storage tank 2 A steel slide frame 4 for stirring the
(E) an overhanging bracket 5 fixed to the end of the gantry 1 and extending elongated while protruding outward from the gantry 1;
(G) a hydraulic cylinder 6 attached to the bracket 5 in a posture in which the piston rod 6a advances and retreats in the horizontal direction;
The slide frame 4 and the rod 6 a of the hydraulic cylinder 6 advance and retreat through a penetration seal portion provided on the peripheral wall of the storage tank 2.
And a connecting shaft 7 for connecting the two. In this example, the storage tank bottom plate 2a is also used as the ceiling plate of the gantry 1, and
The sludge discharge port 2b extending in the dewatered sludge discharge direction at a predetermined width is divided into three. Reference numeral 3 denotes a screw casing which has an elongated box shape with an open upper side and accommodates the above-mentioned cutting screw (not shown).

As shown in FIG. 4, the slide frame 4 has an elliptical annular member 4b fixed to a shaft member 4a extending in the reciprocating direction, and a radial rib member 4c and the like fixed thereto. is there. The connecting shaft 7 is connected to an end portion of the shaft member 4 a of the slide frame 4 on the forward movement direction side, and the other end of the connecting shaft 7 is connected to the rod 6 a of the hydraulic cylinder 6.
It is connected to the. The slide frame 4, the connecting shaft 7, the hydraulic cylinder 6, and the overhang bracket 5 constitute a dewatered sludge stirring device. Here, the length of the shaft member 4a of the slide frame 4 is equal to the inner diameter D of the storage tank 2 (for example, 40 mm).
00 mm), so that the slide frame 4 is reciprocated by the remaining length of about D / 4. Further, the length from the outer peripheral surface of the storage tank 2 to the base end of the hydraulic cylinder 6 is substantially the same as the length of the shaft member 4a and is considerably longer.

As described above, in the dewatered sludge storage device having the slide frame 4, since the dewatered sludge stirring device is of an operation type in which the slide frame 4 is reciprocated linearly, bridging is larger than that of the rotary arm type. It is easy to obtain destructive power and has a large capacity (for example, when the storage amount is 100
m ³ or more). However, in the above-mentioned conventional dewatered sludge storage device, the dewatered sludge stirring device has a structure in which the hydraulic cylinder 6 for driving the slide frame 4 protrudes greatly outside the storage tank 4, and thus requires a large installation space. There was a problem that.

The present invention solves the above-mentioned problems, and provides a dewatered sludge storage device having a slide frame, which requires less installation space and saves space as compared with the prior art. The purpose is to do so.

[0011]

In order to achieve the above object, the invention of claim 1 comprises a storage tank, sludge discharge means for discharging dewatered sludge from the storage tank, and a storage tank bottom plate for discharging dewatered sludge. A dewatered sludge storage device including a dewatered sludge stirring device having a slide frame that reciprocates while sliding on the top and stirs dewatered sludge in the storage tank, wherein the dewatered sludge stirring device is connected to the slide frame. Forward movement wire, forward movement direction changing means for changing the direction of pulling of the forward movement wire in the middle, forward movement actuator for pulling the forward movement wire whose direction has been changed, and backward movement connected to the slide frame. A wire, a reversing direction changing means for changing the retraction direction of the reversing wire in the middle, and a reversing actuator for retraction of the reversing wire having the changed direction. It is dewatered sludge storage apparatus according to claim.

According to a second aspect of the present invention, in the dewatered sludge storage device according to the first aspect, each of the forward actuator and the backward actuator is a hydraulic cylinder. According to a third aspect of the present invention, in the dewatered sludge storage device according to the first aspect, the forward movement actuator and the backward movement actuator are shared by one double rod type hydraulic cylinder. According to a fourth aspect of the present invention, in the dewatered sludge storage device according to the first aspect, the forward direction changing means and the backward direction changing means are each a pulley rotatably supported. I have.

In the conventional dewatered sludge stirring device in the dewatered sludge storage device, the driving force of the hydraulic cylinder as an actuator is transmitted to the slide frame by a horizontally extending connecting shaft, and the slide frame is linearly reciprocated. On the other hand, in the dewatered sludge stirring device in the dewatered sludge storage device according to the present invention, using a forward wire and a backward wire in place of the conventional connecting shaft as a transmission element,
Since each of these wires is provided with a direction changing means for changing the pulling direction of the wire halfway, a forward actuator for pulling the forward-turned wire that has been changed in direction and a return wire that has been turned in the reverse direction are provided. The retracting actuator that pulls the storage tank can be provided, for example, in an empty space below the storage tank, instead of protruding greatly outside the storage tank.

[0014] As the direction changing means, a pulley that changes the pulling direction of the wire by, for example, 90 ° on the way can be used. A hydraulic cylinder can be used as each of the forward actuator and the backward actuator. Further, the forward actuator and the backward actuator can be shared by one double rod type hydraulic cylinder.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing a schematic configuration of a dewatered sludge storage device according to an example of the present invention. Here, except that the configuration of the dewatered sludge stirring device is different, it has the same configuration as the conventional device shown in FIG.
The same parts as those of the conventional device are denoted by the same reference numerals, and description thereof will be omitted. Only different points will be described.

Referring to FIG. 1, the forward side of the dewatered sludge stirring apparatus will be described. Reference numeral 11A denotes a forward wire made of stainless steel. 12A is a forward pulley rotatably supported at one end position of the gantry 1, 13A is fixed to the floor surface in this example below the pulley 12A, and the piston rod 13Aa moves vertically in a vertical direction. This is a stationary hydraulic cylinder for forward movement. The forward movement wire 11A whose one end is connected to the forward movement direction end of the shaft member 4a of the slide frame 4 passes through a not-shown through seal portion provided on the peripheral wall of the storage tank 2, and then is pulled. The direction is changed downward by 90 ° by the forward pulley 12A on the way, and then connected to the distal end of the piston rod 13Aa of the forward hydraulic cylinder 13A as the forward actuator. The forward pulley 12A constitutes a forward direction changing means for changing the pulling direction of the forward wire 11A halfway.

Next, the return side will be described. As shown in FIG. 1, a return wire 11B having one end connected to the end of the shaft member 4a of the slide frame 4 on the return direction side.
After passing through a not-shown through seal portion provided on the peripheral wall of the storage tank 2, the pulling direction of the return pulley 12
After the direction is changed downward by 90 ° by B, it is connected to the distal end of the piston rod 13Ba of the return hydraulic cylinder 13B as the return actuator. The backward pulley 12B constitutes a backward direction changing means. Also, the slide frame 4, the wires 11A, 11A
B, pulleys 12A, 12B and hydraulic cylinder 13A,
13B constitutes a dewatered sludge stirring device.

The operation of the dewatered sludge stirring device at the time of discharging the dewatered sludge in the dewatered sludge storage device thus configured will be described. The piston rod 13Aa of the forward hydraulic cylinder 13A is moved backward (down) to move the forward sludge wire. By pulling 11A, the slide frame 4 can be moved forward. At this time, in this example, the other return hydraulic cylinder 13B is operated synchronously, and the piston rod 13Ba of the hydraulic cylinder 13B is advanced (up). In the case of the backward movement, the slide frame 4 can be moved backward by retracting the piston rod 13Ba of the hydraulic cylinder 13B for backward movement and pulling the wire 11B for backward movement. At this time, the other hydraulic cylinder 13A for forward movement is operated synchronously, and the piston rod 13Aa of the hydraulic cylinder 13A is advanced.

As described above, in this example, the standing-type hydraulic cylinders 13A and 13B can be disposed in an empty space below the storage tank 2, and the installation space of the dewatered sludge storage device is smaller than that of the conventional one. Small enough.

In the above embodiment, the wires 11A and 11B are directly connected to the shaft member 4a of the slide frame 4. However, the present invention is not limited to this. . That is, a forward connection shaft having an appropriate length is connected to the forward end of the shaft member 4a, and a return connection shaft having an appropriate length is connected to the forward end. By connecting the forward movement wire 11A to the forward movement connection shaft and connecting the backward movement wire 11B to the backward movement connection shaft, the lengths of the wires 11A and 11B whose directions are changed by the pulleys 12A and 12B are minimized. You may make it become.

FIG. 2 is a partially cutaway perspective view showing a schematic configuration of a dewatered sludge storage device according to another embodiment of the present invention.

Referring to FIG. 2, the forward side of the dewatered sludge stirring device will be described. 21A is a forward wire made of stainless steel, and 22A is a forward pulley rotatably supported at one end position of the gantry 1. is there. 22A 'is a forward pulley rotatably supported on the floor below the pulley 22A in this example, 23A is fixed to the floor below the storage tank 2 in this example, and the piston rod 23Aa advances and retreats in the horizontal direction. This is a horizontal hydraulic cylinder for forward movement. The forward movement wire 21A whose one end is connected to the forward movement direction end of the shaft member 4a of the slide frame 4,
After passing through a not-shown penetrating seal portion provided on the peripheral wall of the storage tank 2, the pulling direction is changed by 90 ° downward in the middle by the forward pulley 22 </ b> A and guided downward.
Further, the forward movement wire 21A is connected to the distal end portion of the piston rod 23Aa of the forward movement hydraulic cylinder 23A as the forward movement actuator after the pulling direction of the forward movement wire 21A is changed to the 90 ° backward movement direction by the forward movement pulley 22A '. Have been. The forward pulleys 22A and 22A 'constitute forward-direction changing means.

Next, the return side will be described. As shown in FIG. 2, a return wire 21B having one end connected to an end of the shaft member 4a of the slide frame 4 on the return direction side.
After passing through a not-shown penetrating seal provided on the peripheral wall of the storage tank 2, the pulling direction of the return pulley 22
B is turned downward by 90 ° and guided downward, and further, the pulling direction is changed to 90 ° by the forward pulley 22B ′. The moving hydraulic cylinder 23B is connected to a distal end of a piston rod 23Ba. The return pulleys 22B and 22B 'constitute return direction changing means. Further, the slide frame 4, the wires 21A and 21B, the pulleys 22A and 22A ', 22
B, 22B 'and the hydraulic cylinders 23A, 23B constitute a dewatered sludge stirring device.

The operation of the dewatered sludge stirring device at the time of discharging the dewatered sludge in the dewatered sludge storage device thus constructed will be described. The piston rod 23Aa of the forward hydraulic cylinder 23A is retracted to pull the forward wire 21A. By doing so, the slide frame 4 can be moved forward. At this time, in this example, the other backward movement hydraulic cylinder 23B is operated synchronously to
The B piston rod 23Ba is moved forward. In the case of returning, the returning hydraulic cylinder 23 is used.
The slide frame 4 can be moved backward by retracting the piston rod 23Ba of B and pulling the return wire 21B. At this time, the other hydraulic cylinder 23A for forward movement is operated synchronously, and the piston rod 23Aa of the hydraulic cylinder 23A is advanced.

As described above, in this example, the horizontal hydraulic cylinders 23A and 23B can be disposed in the empty space below the storage tank 2, and the installation space of the dewatered sludge storage device is smaller than in the conventional case. Small enough.

FIG. 3 is a partially cutaway perspective view showing a schematic configuration of a dewatered sludge storage device according to another example of the present invention. Here, except that the hydraulic cylinder of the dewatered sludge stirring device is different, the device is the same as the device shown in FIG. I do.

As shown in FIG. 3, in this example, the forward hydraulic cylinder and the backward hydraulic cylinder are shared by one double-rod hydraulic cylinder 33. A forward movement wire 21A is connected to one piston rod 33a of the reciprocating double rod hydraulic cylinder 33, and a backward movement wire 21B is connected to the other piston rod 33b.
Is connected. The slide frame 4 can be moved forward by retracting the piston rod 33a to pull the wire 21A for forward movement and advancing the other piston rod 33b, and by performing the reverse operation. , The slide frame 4 can be moved back. Thus, in this example, the double rod type hydraulic cylinder 33 can be disposed in an empty space below the storage tank 2. Further, since one hydraulic cylinder for forward movement and one hydraulic cylinder for backward movement can be used, the cost is lower than that of the apparatus shown in FIG.

[0028]

As described above, according to the dewatered sludge storage device of the present invention, the hydraulic cylinder for reciprocating the slide frame can be disposed in the empty space below the storage tank. The installation space of the device is smaller than that of the device, the space can be saved, and the storage capacity can be increased.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a schematic configuration of a dewatered sludge storage device according to an example of the present invention.

FIG. 2 is a partially cutaway perspective view showing a schematic configuration of a dewatered sludge storage device according to another example of the present invention.

FIG. 3 is a partially cutaway perspective view showing a schematic configuration of a dewatered sludge storage device according to another example of the present invention.

FIG. 4 is a partially cutaway perspective view showing a schematic configuration of a conventional dewatered sludge storage device having a slide frame.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stand 2 ... Storage tank 2a ... Storage tank bottom plate 2b ... Sludge discharge port 3 ... Screw casing 4 ... Slide frame 4a ... Shaft member 4b ... Elliptical annular member 4c ... Radial rib member 5 ... Overhang bracket 6 ... Hydraulic cylinder 6a ... Piston rod 7: Connecting shaft 11A, 21A
... wires for forward movement 11B, 21B ... wires for return movement 12
A, 22A, 22A '... pulley for forward movement 12B, 22
B, 22B ': Backward pulley 13A, 23A: Forward hydraulic cylinder 13Aa, 23Aa: Piston rod 13B, 23B: Backward hydraulic cylinder 13Ba, 2
3Ba: Piston rod 33: Double rod type hydraulic cylinder for reciprocation 33a, 33b: Piston rod

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F075 AA07 BA09 BB01 CA02 CA09 DA06 4D059 AA03 BE08 BE16 BJ20 CB09 CB30

Claims (4)

[Claims] 1. A storage tank, a sludge discharge means for discharging dewatered sludge from the storage tank, and a slide for reciprocating while sliding on a bottom plate of the storage tank when discharging dewatered sludge to stir the dewatered sludge in the storage tank. A dewatered sludge storage device comprising a dewatered sludge stirring device having a frame, wherein the dewatered sludge stirring device includes a forward movement wire connected to the slide frame, and a forward movement wire that changes a pulling direction of the forward movement wire halfway. Direction changing means, a forward actuator for pulling the forward-turned wire whose direction has been changed, a backward wire connected to the slide frame, and a backward-direction changing means for changing the pulling direction of the backward wire halfway And a return actuator that pulls the return wire whose direction has been changed. 2. The dewatered sludge storage device according to claim 1, wherein each of the forward movement actuator and the backward movement actuator is a hydraulic cylinder. 3. The dewatered sludge storage device according to claim 1, wherein the forward movement actuator and the backward movement actuator are shared by one double rod type hydraulic cylinder. 4. The dewatered sludge storage device according to claim 1, wherein the forward-direction changing means and the backward-direction changing means are each a rotatably supported pulley.