JPH03146147A - Sand washing and separating machine - Google Patents

Abstract

PURPOSE:To facilitate the discharging operation of settled sand by a method wherein a sand lift pipe from a sand lift pump is connected with the inner tube of a cyclone and a cleaning pipe for supplying pressure air is connected with the outer tube thereof. CONSTITUTION:Foul water and sand are introduced into an inner tube 32 of a sand washing and separating machine 30 and move downwardly whirling round the inner wall thereof. While the sand in the foul water is whirling round the inner wall of the inner tube 32, contaminants are washed off from the surface of the grain of sand and the sand slows down in its movement and drops from a lower opening of the inner tube 32. A large-grain sand is then dropped onto a screw conveyor 18 and, during the aforesaid whirling time, contaminants are washed off from the surface of a fine-grain sand, which then slows down in its movement and drops from the lower opening thereof. The large-grain sand, after discharge from the lower opening of the inner tube 32, is carried upwardly on a rising air current in an outer tube 31. This permits a reduction in the amt. of sand discharged to the exterior.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a sand washing separator for washing sediment in sewage treatment facilities.

(Prior Art) In water treatment facilities, especially pump stations, a settling basin is provided in front of the pump in order to prevent pump wear and blockage. This settling basin is for removing settled sand from wastewater. Further, the settling basin is equipped with a settling discharge device for discharging the settled sand at the bottom of the settling basin to the outside.

FIG. 4 and FIG. 5 show a conventional sand settling and discharging device.

FIG. 4 is a diagram showing a rotating grab type sand lifter.

In FIG. 4, the grab type sand lifter 40 is connected to a traveling rail 41
It includes a support stand 42 that travels thereon, and a main body 44 that turns on a turning rail 43 provided on the support stand 42. A swing arm 45 is attached to the main body 44, and a grab 46 is provided at the tip of the swing arm 45 so as to be movable up and down.

In the grab-type sand lifter 40 having such a configuration,
The sediment discharge work is carried out as follows.

That is, first, a worker rides on the main body 44 and operates it, and moves the support stand 42 to a predetermined position above the settling basin 10. Next, the main body 44 is turned on the turning rail 43, and the grab 4
6 is brought to a predetermined position on the settling basin 10, the grab 46 is lowered to grasp the sand at the bottom of the settling basin 10. Thereafter, the grab 46 is raised and the main body 44 is rotated on the turning rail 43 to dispose of the settled sand at a disposal site outside the settling basin 10.

Further, FIG. 5 is a diagram showing the packet conveyor 50.

In FIG. 5, a packet conveyor 50 has a chain 52 running on a guide rail 51 provided in a settling basin 10.
And, a large number of packets 5 are successively attached to Cheno 52.
3.

In the packet conveyor 50 having such a configuration, when the packet conveyor 50 runs on the cheno 52 or the guide rail 51, the packet 53 scoops out the sediment at the bottom of the settling basin 10, and the cheno 52
move upwards along.

Thereafter, the packet 53 repeats itself at the upper part of the settling basin 50 and drops the sand stored therein onto the discharge conveyor 54. The sand that has fallen onto the discharge conveyor 54 is then cleaned by a cleaning pipe 55 and discharged to the outside.

(Problems to be Solved by the Invention) As described above, conventionally, as a settling and discharging device, a rotating grab type sand lifter 40 (FIG. 4) and a packet conveyor 50 have been used.
(Fig. 5) etc. are known.

However, the revolving grab type sand lifter 40 must be operated by a worker, and the sand discharge operation is complicated. In addition, the packet conveyor 50 includes a cheno 50 in the sand settling basin 10.
Because operating machines such as
This poses a problem in terms of maintenance and inspection.

The present invention has been made in consideration of these points,
(1) An object of the present invention is to provide a sand washing separator for use in a sand discharge device that allows easy sand discharge work and maintenance/inspection work.

[Structure of the invention]

(Means for Solving the Problems) The present invention consists of a double-structured cyclone having an outer cylinder and an inner cylinder, in which a sand pump from a sand pump is connected to the inner cylinder, and pressurized water or pressurized air is The sand discharging device is characterized in that a washing pipe for sending the sand is connected to the outer cylinder to wash the sand from the sand pump.

(Function) Sediment is sucked up along with sewage by a sand pump, and then fed into the inner cylinder of the sand washing separator. At the same time, pressurized water or pressurized air is sent to the outer cylinder of the sand washing separator to wash the sand. Completely separated from other wastewater.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3 are views showing one embodiment of the present invention.

In FIG. 1, the bottom of the sand settling basin 10 is slightly inclined, and a sand pump 15 is disposed at the extreme end (on the right side of FIG. 1). A washed sand separator 30 is connected to this sand pump 15 via a sand pump pipe 16, and a screw conveyor 18 is provided at the lower end of the washed sand separator 30 to send the sand separated by the washed sand separator 30. It is connected. The screw conveyor 18 is driven by a motor 18a, and its upper end is connected to the upper end of the sand hopper 20. Further, a belt gate 21 driven by a motor 21a is attached to the lower end of the sand hopper 20.

Further, slightly above the bottom of the sand settling area 10, there is a nozzle 14 for transferring the sand settled at the bottom to the sand pump 15 side.
are provided consecutively.

That is, the washing water in the water receiving tank 11 is pressurized by the pressurizing pump 12, and water is ejected from the nozzle 14 through the washing pipe 13, blowing off the sediment at the bottom of the sand settling tank 10 and transferring it to the sand lifting pump 15 side. It looks like this.

Further, a gate valve 25 is attached to the upstream side of each nozzle 14. Note that the cleaning pipe 13 branches in the middle, one side is connected to the nozzle 14 as described above, and the other side is connected to the cleaning pipe 3.
5 and is connected to the washed sand separator 30.

Next, the washed sand separator 30 will be explained with reference to FIGS. 2 and 3.

The washed sand separator 30 includes an outer cylinder 31 having a lid 33 and having a substantially cylindrical shape.
The cyclone is comprised of a double structure cyclone having a substantially inverted conical inner cylinder 32 disposed within an outer cylinder 3'1. Further, a flange 32a fixed to the inner wall surface of the outer rJ 31 is formed at the upper end of the inner cylinder 32, and one end of a drain pipe 36 is connected to the upper part of one side of the outer cylinder 31 via a discharge port 37. . The other end of this drain pipe 36 is connected to the sand settling tank 0, so that the waste water in the outer cylinder 31 and the overflow water in the inner cylinder 32 are returned to the sand settling tank 10.

Further, a sand pump 16 from a sand pump 15 is connected to the sand washing separator 30, and the tip 16a of the sand pump roller is connected to the outer cylinder 3.
1 and the inner cylinder 32 in order and extends into the inner cylinder 32. At this point, the tip 16a of the sand shield 16 is disposed approximately along the inner wall surface of the inner cylinder 32 (FIG. 3). Furthermore, a plurality of cleaning pipes 35 branched from the cleaning pipe 13 are provided in the F section of the outer cylinder 31, similar to the tip 16a of the sand pumping pipe 16.
It is arranged approximately along the inner wall surface of the Further, a bebicon 19 is connected to each cleaning pipe 35 so that pressurized cleaning water and pressurized air can be sent into the outer cylinder 31 through the cleaning pipe 35.

Further, a screw conveyor 18 is connected to the lower end of the outer cylinder 31 in a sealed state. This screw conveyor 1
8 is constructed by incorporating a screw blade 27 in a casing 26, and a comb body (not shown) that comes into contact with the inner surface of the casing 26 is attached to the tip of the screw blade 27. This rubber body increases the force of transporting sand between it and the inner surface of the casing 26.

Next, the operation of this embodiment having such a configuration will be explained.

First, the cleaning water in the water receiving tank 11 is pressurized by the pressurizing pump 12 and flows into the nozzle 14 via the cleaning pipe 13. Then, water is ejected from the nozzle 14, and the sand settled at the bottom of the sand settling basin 10 is transferred to the sand pump 5 side and collected. In this case, in the nozzle 14 near the sand pump 15,
Since the washing water flows in through the pressure reducing valve 29, the sediment can be reliably collected near the sand pump 15. continue,
The sand in the sand settling basin 1o is sucked up together with sewage by the sand pump 15, and is introduced into the sand washing separator 30 via the sand pump 16.

Next, the operation within the washed sand separator 30 will be described in detail.

As shown in FIGS. 2 and 3, the sewage and sand submerged in the inner cylinder 32 of the washed sand separator 30 swirl and descend along the inner wall surface of the inner cylinder 32 at a predetermined flow velocity. In this case, while the sand in the waste water swirls along the inner wall surface of the inner cylinder 32, dirt on the surface of the sand is washed off, decelerates, and falls from the lower end opening of the inner cylinder 32. Thereafter, the large sand falls toward the screw conveyor 18, and the fine sand exits the lower end opening of the inner cylinder 32 and rises along with the upward flow within the outer cylinder 31.

The fine sand that has risen into the outer cylinder 31 is agitated and cleaned by pressurized cleaning water and pressurized air flowing from the cleaning pipe 35, and then falls onto the screw conveyor 18 side. In this case, among the cleaning water or pressurized air from the cleaning pipe 35,
Only one of them may be allowed to flow in.

In this way, the washed sand with dirt removed from the surface falls onto the screw conveyor ]8 side, and the remaining lTi water (
(contains no sand) enters the outer cylinder 31 from the lower end opening of the inner cylinder 32, rises inside the outer cylinder 31, and reaches the discharge port 37 and the discharge pipe 3.
6 and then returned to the settling basin 10.

The sand that has fallen onto the screw conveyor 18 is transferred to the casing 2.
6 and the screw blades 27, and is thrown into the sand hopper 20. In this case, since the rubber body is attached to the tip of the screw blade 27, the sand transport force can be reliably increased.

After a predetermined period of time has elapsed, the belt gate 21 is opened and the sand put into the sand settling hopper 20 is discharged to the outside by an appropriate transfer means.

According to this embodiment, the sand at the bottom of the settling tank 10 collected by the nozzle 14 is sucked up together with waste water by the sand pump 15, and the sand is washed by the sand washing separator 30 and completely separated from other waste water. Only the washed sand can be fed into the sand hopper via the screw conveyor. Therefore, the sand can be reliably discharged without providing an operating machine such as a packet conveyor in the sand settling basin. Further, by charging only washed grains that do not contain mud or the like into the sand hopper, the amount of sand discharged to the outside can be reduced. Thereby, the cost of discharging the sediment to the outside can also be reduced.

〔Effect of the invention〕

As explained above, according to the present invention, only the sand that has been washed by the sand washing separator and separated from other wastewater can be charged into the sand settling hopper, thereby reducing the amount of sand discharged to the outside. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a schematic system diagram showing one embodiment of the sand settling and discharging device, Fig. 2 is a schematic side view of the sand washing separator, and Fig. 3 is Fig. 2
The line arrow view, FIGS. 4 and 5 are schematic system diagrams showing a conventional sand settling and discharging device. 10... Sand settling basin, 14... Nozzle, 15... Sand pump, 16... Sand pumping pipe, 18... Screw conveyor, 20... Bebicon, 30... Sand washing separator ,3
1...Outer cylinder, 32...Inner cylinder.

Claims (1)

[Scope of Claims] Consisting of a double-structured cyclone having an outer cylinder and an inner cylinder, a sand pump from a sand pump is connected to the inner cylinder, and a cleaning pipe for supplying pressurized water or pressurized air is connected to the outer cylinder. A sand washing separator, characterized in that it is connected to a cylinder and is configured to wash sediment from the sand pump.