JPH0716406A - Dehydrator for slurry - Google Patents

Abstract

PURPOSE:To provide a dehydrator for slurry hardly generating the clogging of a filter and low in running cost. CONSTITUTION:A feed port 21 and discharge port 22 are formed in a transporting pipe 14. A freely bendable driving loop member 15 is arranged so as to circulate through the transporting pipe 14. Plural flight panels 16 are attached to the loop member 15. At least one part between the feed port 21 and the discharge port 22 of the transporting pipe 14 is composed of a filter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for dewatering slurry such as muddy water discharged from a construction site.

[0002]

2. Description of the Related Art Filter presses, centrifuges and the like are known as devices of this type.

[0003]

The basic principle of the above apparatus is that the slurry is dehydrated by passing the slurry through a filter, but there is a problem that the filter is easily clogged. If the filter becomes clogged, the filter must be cleaned or replaced, and frequent maintenance such as this adds to the running cost.

An object of the present invention is to provide a slurry dewatering device in which the filter is unlikely to be clogged and the running cost is low.

[0005]

SUMMARY OF THE INVENTION A slurry dehydrator according to the present invention comprises a carrier pipe having an inlet and an outlet, and a plurality of flight plates arranged so as to circulate through the carrier pipe. And a bendable drive loop member to which is attached, and at least a part between the inlet and the outlet of the transport pipe is formed of a filter.

[0006]

The slurry dewatering device according to the present invention is provided with a carrier pipe having an inlet and an outlet, and a plurality of flight plates arranged so as to circulate through the carrier pipe. A flexible drive loop member is provided, and at least a part between the inlet and outlet of the transfer pipe is formed by a filter, so that the slurry is moved inside the filter while being stirred by the flight plate. Therefore, the slurry does not settle in the filter, and the slurry is scraped off by the flight plate even when trying to settle.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

The slurry dehydrator is, as shown in FIG.
A rectangular base 11 which is long in the front-rear direction, a rear loading hopper 12 and a front discharging tank 13 which are supported on the base 11 at predetermined intervals, and a lower loading hopper 12 and an upper discharging tank 13 are arranged to extend. The transport pipe 14 that is arranged in
A loop member 15 arranged so as to circulate through the transfer pipe 14, a plurality of flight plates 16 attached to the loop member 15 at predetermined intervals, and a loop member 15 wound above the discharge tank 13. It is equipped with a sprocket 17 that is hung.

The transport pipe 14 has a charging port 21 connected to the bottom of the charging hopper 12 and a discharging port 22 facing above the discharging tank 13, and a feeding side extending from the charging port 21 to the discharging port 22. It has a path 23 and a return path 24 extending from the discharge port 22 to the input port 21. The sending side path 23 and the returning side path 24 are formed by sequentially connecting a plurality of types of pipe members via flanges. A horizontal pump chamber 25 and a vertical filter chamber 26 are provided in the feed-side path 24 in the order close to the inlet 21.

Referring to FIG. 2, the pump chamber 25 has a predetermined length L and an inner diameter d. Inner diameter d of pump chamber 25
Is smaller than the inner diameter d'of the path other than this portion, and a tapered guide portion 27 is provided at the boundary between the two. The pipe member forming the pump chamber 25 is made of an abrasion resistant material such as synthetic resin or ceramic,
The other pipe materials are made of iron.

Referring to FIG. 3, the filter chamber 26 comprises an inner pipe member 31 and an outer pipe member 32. The inner pipe member 31 includes a wire mesh tubular filter 33 and a filter 33.
It consists of inner and outer perforated plate cylindrical holders 34 and 35 that sandwich and hold. Between the inner pipe member 31 and the flight plate 16, 4 ~
There is a gap of about 5 mm. A discharge pipe 36 is provided near the lower end of the outer pipe member 32. The discharge pipe 36 is provided with a discharge pump (not shown). The discharge pump is preferably a reversible rotary type, such as a tube pump, which can supply and drain water.

The loop member 15 is a large number of rods of two types, long and short.
It is composed of 51 and 52. As shown in detail in FIGS. 4 and 5, one-letter-shaped notch grooves 53 are formed on both end surfaces of the long rod 51, respectively. Pin fixing holes 54 are concentrically formed on both side walls of both notch grooves 53. A flange-shaped sprocket engaged portion 55 is provided at the center of the outer surface of the long rod 51.
Is provided. An annular flight plate mounting groove 56 is formed on the outer surface of the engaged portion 55. Four pin insertion holes 57 are equally formed on both side walls of the mounting groove 56 at equal intervals. As with the long rod 51, a cutout groove 58 and a pin fixing hole 59 are also formed on the end surface of the short rod 52.

The long and short rods 51 and 52 are placed endlessly so that every other one of the long and short rods abuts each other, and the two elliptical rings 61 connected to each other at opposite ends of the long and short rods 51 and 52. The long and short rods 51 and 52 are connected by. That is, one of the two elliptical rings 61 is fitted in the notch groove 53 of the long rod 51, and the other is fitted in the notch groove 57 of the short rod 52, and the two connecting pins 62 are connected to each other.
One of the rings 61 is inserted into the pin fixing holes 54, 59 of the long and short rods 51, 52.

In the state where the long and short rods 51 and 52 are connected as described above, the gap between the two rods 51 and 52 is set to be substantially equal to zero (of course, in consideration of manufacturing error). A gap is necessary). To explain this in detail, long rod
One end 61 of the outer surface of the ring 61 fitted in the notch groove 53 of the 51
a is brought into contact with the bottom 53a of the cutout groove 53 of the long rod 51,
The other end 61b of the outer surface of the ring 61 is an end surface 52a of the short rod 52.
Is abutted against. The same applies to the ring 61 fitted in the cutout groove 57 of the short rod 52 (see reference numeral).
Furthermore, the inner surface of the connecting end of the two rings 61 connected to each other
61c are brought into contact with each other.

The flight plate 16 is composed of two divided pieces 71 which are made of a wear resistant material such as synthetic resin and are formed in a semi-annular shape. Both the split pieces 71 are fitted into the mounting groove 56 and are joined together to form an annular shape. A rubber bush 72 is attached in a penetrating manner at a location corresponding to the pin insertion hole 57 of each of the divided pieces 71. The engagement pin 73 is forcibly pushed into the rubber bush 72 through the pin insertion hole 57. The frictional resistance of the rubber bush 72 prevents the engagement pin 73 from accidentally coming off from the rubber bush 72.
Is attached to the long rod 51 of. Engagement pin 73
The flight plate 16 can be easily replaced by attaching or detaching 72 to or from the rubber bush.

Referring to FIG. 2 again, the gap between the inner surface of the pump chamber 25 and the outer surface of the flight plate 16 is maintained at a size capable of maintaining watertightness, for example, about 0.1 to 0.2 mm. On the other hand, the inner surface of the carrier pipe 11 other than the pump chamber 25 and the flight plate 16
The gap on the outer surface is large enough to prevent the slurry from leaking and is kept large enough to reduce the frictional force on both surfaces as much as possible, for example, about 4 to 5 mm. Further, the pitch P of the flight plate 16 is set to be equal to or slightly smaller than the length L of the small diameter portion 35.

The length of the long and short rods 51 and 52 will be described with reference to FIG. Two adjacent flight boards
It is assumed that 16 is located at the start point and the end point of the route M in the locality R of the transport pipe 14 together with the long rod 51, and the short rod 52 is located at the intermediate point between the start point and the end point of the route M. in this case,
The lengths l1 and l2 of the long and short rods 51 and 52 are determined so that the axis N of the short rod 52 becomes a tangent to the same path M. As a result, the long and short rods 51, 52 always move on the same path M, that is, on the axis of the transport pipe 14, and the clearance between the rods 51, 52 is zero. It is not tilted with respect to the axis of the carrier pipe, and therefore the flight plate 16 does not fall over.

As shown in detail in FIGS. 7 and 8, the sprocket 17 includes a boss 82 mounted on a horizontal rotary shaft 81 extending in the left-right direction above the discharge tank 13, and a loop member.
It has a pair of vertical discs 83 which are attached to the boss 82 so as to face each other at intervals so that the 15 can be loosely inserted.

The rotary shaft 81 is supported by brackets 84 provided on the discharge tank 13 on both left and right sides of the disk 83 by bearings 85. The output shaft of the motor 86 is connected to the right end of the rotary shaft 81 via a coupling 87.

Four engagement pins 88, around which the loop member 15 is wound, are provided at equal intervals on the circumference around the center of rotation of both discs 83. Four notches 89, into which the flight plate 16 is inserted, are formed at equal intervals on the outer peripheral edge of the disc 43 immediately upstream of the engaging pin 88 in the disc rotation direction, so that between the notches 89 adjacent to each other. Tooth 90 is formed.

When the disk 83 is rotated while the loop member 15 is wound around the engagement pin 88, the teeth 50 move to the loop member.
It abuts the engaging portion 55 of 15 and pushes it. At this time,
The shape of the notch 89 is set to the minimum size that can avoid the interference between the disc 83 and the flight plate 16, and the teeth 90 occupy the gap between the adjacent flight plates 16 when viewed from the side. ing.

When the movement path of the loop member 15 when the loop member 15 is wound around the engagement pin 88 is the pitch circle diameter D of the sprocket 17, the pitch circle diameter D is twice the local ratio R. .

When the sprocket 17 is rotationally driven by the motor 86, the teeth 90 of the sprocket 17 engage with the engaged portion 55 with the long rod 51 sandwiched therebetween and push it to move the flight plate 17. Are sequentially moved from the input port 21 toward the discharge port 22 along the transport path.

The slurry introduced from the inlet 21 is pushed along the conveying path by the flight plate 17 approaching the inlet 21, and is discharged from the outlet 22 when it reaches the outlet 22.

The pump chamber 25 of the carrier pipe 14 is replaced by the flight plate 17
As described above, when the slurry moves while transporting the slurry, the gap between the slurry and the slurry is set to be watertight, so that the slurry does not leak into the gap between the slurry and the slurry. Therefore, the slurry can be reliably passed through the pump chamber 25 without leakage. If the slurry passed through the pump chamber 25 reaches the downstream side in the transport direction, the slurry may leak from between the transport pipe 14 and the flight plate 17 there, but the pump chamber 25 from the upstream side in the transport direction. Since the slurry that has passed through is sent, it is reliably transported downstream.

When the conveyed slurry passes through the filter chamber 26, the water contained in the slurry passes through the filter 33 and flows out through the discharge pipe 36. At this time, if the discharge pump is operated and the water is forcibly discharged, the water is efficiently discharged.

When the discharge pump is rotated in the reverse direction while the slurry transfer is stopped and the pressurized water is sent to the transfer pipe 14 through the discharge pipe 36, the filter 33 is washed by the sent pressurized water.

FIG. 9 shows an example of use in which the dehydrator is applied to an elevator conveyor.

The elevator conveyor is a transfer pipe arranged so as to extend through a low place H1 and a high place H2.
91, a loop member 92 arranged so as to circulate through the carrier pipe 91, a plurality of flight plates 93 attached to the loop member 92 at predetermined intervals, and the loop member 92 is wound at a height H2. It has a sprocket 94 that is hung.

The conveying pipe 91 has a charging port 95 at a low place H1 and a discharging port 96 at a high position H2, and has a feed path 97 extending from the charging port 95 to the discharging port 96 and a discharging port from the discharging port 96.
It has a return path 98 extending to 95. Then, the pump chamber 25 and the filter chamber 26 described above are provided in the sending-side path 98 in the order of being closer to the inlet 95.

[0031]

According to the present invention, since the slurry is moved in the filter while being stirred by the flight plate, the slurry is not settled in the filter, and even if the slurry is settled, the slurry is scraped off by the flight plate. As a result, a slurry dewatering device that does not easily clog the filter and has a low running cost can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a dehydrator according to the present invention.

FIG. 2 is a vertical sectional view of a pump chamber of the apparatus.

FIG. 3 is a vertical sectional view of a filter chamber of the apparatus.

FIG. 4 is an exploded perspective view of a rod and a flight plate of a loop member of the same device.

FIG. 5 is a side view of a connecting end portion of the rod.

FIG. 6 is a vertical cross-sectional view of a bent portion of a carrier pipe of the apparatus and a peripheral portion thereof.

FIG. 7 is a side view of a sprocket and its peripheral portion of the same device.

8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a perspective view showing a usage example in which the device is applied to a vertical conveyor.

[Explanation of symbols]

 14 Transport pipe 15 Loop member 16 Flight plate 21 Input port 22 Ejection port 33 Filter

Claims (1)

[Claims] 1. A flexible pipe having a feed port (21) and a discharge port (22) and a plurality of flight plates (16) arranged so as to circulate through the transport pipe (14). A slurry dewatering device comprising: a drive loop member 15;