JPS6116513B2 - - Google Patents

Description

[Detailed description of the invention] The present invention cleans dirty sand and removes organic matter (garbage) in the dirty sand.
The present invention relates to a dirty sand cleaning and transporting device that reliably transports only washed sand after separating it.

Conventionally, a device as shown in FIG. 4 has been proposed as a device for washing dirty sand and transporting the washed sand. This is done by installing a sand transport device in the washing tank to transport the washed sand out of the tank, and injecting high-pressure air into the washing water from the bottom of the tank to stir and wash the dirty sand thrown into the tank. The sewage along with the floating garbage is discharged through a trough, and the settled washed sand is discharged through a sand discharge device. However, with this method, stirring of the waste sand is insufficient and difficult to perform reliably, and organic waste cannot be completely discharged from the outflow trough.
The disadvantage is that organic waste is mixed into the discharged sand.

In view of this, the present invention is designed to reliably separate organic waste and inorganic sand after sufficiently stirring the input waste sand, and then to separate the waste and sand before discharging. be.

The present invention will be explained below based on examples.

In the figure, 1 is a cleaning tank designed to wash the sludge collected in a settling basin or other means to remove organic matter contained in the sewage. to supply. The washing water and the waste sand may be supplied simultaneously or separately, and may be supplied at regular intervals or continuously or by other methods. Stirring blades 2, 2 are provided on the inner surface of this cleaning tank 1.
is driven by a drive device 4, thereby effectively utilizing the stirring flow generated by the stirring blades to stir the dirty sand, thereby separating the inorganic and organic substances in the dirty sand and improving the cleaning effect. Further, a partition plate 3 is provided vertically in the cleaning tank for suppressing the water flow in the cleaning tank in the direction of movement from the position where the stirring blade is provided, that is, in the right direction in FIG. This partition plate 3 has the same width as the cleaning tank width, and is provided so as to create a gap between the lower edge of the partition plate 3 and the bottom of the tank. Preventing the sand from being short-passed to the next separation zone, thereby ensuring a well-defined cleaning of the sludge, so that the sludge obtains an adequate residence time in the agitation zone. . In order to make this stirring action more efficient, high-pressure air and pressure water may be auxiliary injected from the bottom of the cleaning tank. The dirty sand that has been stirred and washed in the cleaning tank stirring zone A, which is partitioned by a partition plate using the stirring blades, is separated into organic matter and inorganic matter, and the sand and organic matter are separated in the state in which they are suspended in the wastewater. It passes through the gap between the bottom edge of the plate and the bottom of the tank and reaches separation zone B, which serves as a drainage passage. An overflow trough 5 is provided in the upper part of this separation zone B, and the wash water flowing upward through the zone is discharged to the outside of the tank via this overflow trough. In addition, a gap W is provided at the lower end of the washing tank wall 6 opposite to the partition plate 3 that forms this separation zone B, and the discharge zone C adjacent to the downstream side of this separation zone B and the separation zone B are separated from each other as described above. It is made to be continuous through the gap W in the cleaning tank wall 6. Then, the stirred sludge moves from stirring zone A to separation zone B, and in the upward flow generated in this separation zone, organic waste is raised together with the washing water flow (upward flow) and discharged from the overflow trough. Inorganic substances such as sand and gravel that settle in this separation zone B flow into the carry-out zone C through a gap W at the lower end of the washing tank wall. Then, in this carry-out zone, a carry-out device 7 such as a flight conveyor, which is close to the outer surface of the cleaning tank wall and is driven at the bottom of the carry-out zone, is installed and driven, so that the flight 7a The washing sand that has flowed in is scraped up and carried out to a predetermined position by the drive of a carrying out device.

The gap between the lower edge of the partition plate 3 and the cleaning tank wall 4 can be adjusted, thereby adjusting the upward flow velocity generated in the separation zone B and determining the size of the organic waste to be removed. In some cases, the bottom of the agitation zone A is covered with burrs S, and high-pressure air is injected into the tank from within the burrs.

Furthermore, the inside of the cleaning tank is stirred by the cooperation of the inflow of high-pressure air, the injection of high-pressure water into the lower part of the tank, and the stirring blade, but this stirring means can be used alone or in combination of two or more. It is. Further, the bottom surface of the stirring zone may be sloped so that the stirred dirt can easily move toward the carrying-out device.

According to the present invention, the dirty sand introduced into the stirring zone of the cleaning tank is forcibly stirred by stirring blades, etc., and then sent to the separation zone through the bottom of the zone, where the specific gravity is reduced by the upward flow. Light organic garbage and sand are separated, the garbage is discharged from the overflow trough together with washing water, and the washed sand flows further into the carry-out zone from the bottom of this separation zone and falls.
Since the waste is carried out from here, the efficiency of cleaning the waste is high, and there is an advantage that the separation of waste and sand can be performed simultaneously easily and reliably.

[Brief explanation of the drawing]

1 is a vertical front view, FIG. 2 is a plan view, FIG. 3 is a side view, and FIG. 4 is a diagram of a known embodiment, A is a vertical front view, and B is a side view. 1... Cleaning tank, 2... Stirring blade, 3... Partition plate, 4... Drive device, 5... Overflow trough, 6...
Washing tank wall, 7... Carrying out device, A... Stirring zone,
B... Separation zone, C... Export zone.

Claims (1)

[Claims] 1. A stirring zone in which the input dirty sand is forcibly stirred by the rotation of a stirring blade, and the stirring zone and its bottom are connected to each other at an angle, and are adjacent to each other through a partition plate, There is a separation zone in which the organic matter after stirring and washing flows out of the overflow trough along with the washing water by the generation of an upward flow, and on the downstream side of this separation zone, the washing sand that settles in the separation zone is removed from the bottom of the separation zone. A device for washing and discharging dirty sand, comprising: a discharging zone in which the sand flows in and falls through the discharging zone, and a discharging device is provided in the discharging zone to transport and discharge the settled sand flowing into and falling into the discharging zone. .