JPS6129442Y2 - - Google Patents

Description

[Detailed description of the invention] When lifting and transporting away sand that has accumulated in a sand-setting area at a water purification plant or other such facility, if a normal sand-lifting device such as a bucket conveyor is used, the water is scooped up along with the sand. If this is then dumped directly into a storage facility such as a hopper, the water will not drain, which is inconvenient.
Furthermore, if the water is drained through a screen, not only will fine sand particles fall along with the water and be unable to be removed, but the mesh of the screen may become clogged with sand.

In this project, this dewatering operation is carried out using a sand filter to prevent the fine sand from flowing out during pumping, and the sand itself is used as a material and is repeatedly scraped off to renew the sand surface. It is characterized by carrying out the removal and removal in one movement, and aims to improve the effectiveness using a simple principle.

Next, the aspect will be explained with reference to examples.

Example As shown in Fig. 1, the sand settling basin 5 is laterally crossed and the running trough 2 of the flight conveyor 1 is crossed, and dewatering pits 3 are provided at the bottom near both ends of the trough 2, close to both side walls of the basin. .

Next, as shown in FIG. 2, in the dewatering pit 3, a water culvert 6, a porous slab 7, a gravel layer 8, and a coarse sand layer 4 are provided from the bottom, respectively, and a drain pipe 9 is passed through the water culvert 6, so that the water flows into the trough 2. The water immediately flows into two or any of the dewatering pits 3, passes through the coarse sand layer 4, and is discharged. In the inner cavity of the trough 2, a large number of flights 12 stretched between a pair of endless chains 10 are connected at a constant distance, and a sprocket 11 and its driving device (not shown) are engaged with the chains 10. The hopper 13 is equipped with a flight conveyor 1 having a scraping end 1' disposed on a hopper 13.

Separately, in the sand settling pond 5, a bucket conveyor is arranged, which is made up of a pair of endless chains 14 that rotate in the vertical direction with respect to the pond, and in which long buckets 15 are inserted in multiple stages at a certain distance and fixed to each other. As shown in Fig. 3, the opening side of the bucket 15 is tilted in the direction of movement of the conveyor, and the sand is moved while scraping the pond bottom 5', and the sand is pulled upwards at the sand settling basin entrance side.
Bucket 1 directly above flight conveyor 1
5 is installed so that it can be overturned.

In this way, raw water is introduced into the sand settling basin, the flow rate is reduced, and the water is allowed to stagnate for several minutes.Then, the sand deposited on the bottom of the pond is scooped up by the bucket conveyor and moved along with the water in the bucket 15. , the water reaches the top of the flight conveyor 1 and is scattered, but at this time, the water passes through the watering pit 3 and is immediately removed, and the remaining sand moves through the trough 2 by the action of the flight 12, and some of the water is scattered. The sand accumulates on the upper surface of the coarse sand layer 4 of the dewatering pit 3 and becomes oversand by itself, and is successively scraped off by the flights 12 that follow, and accumulates again.In this way, the sand is transferred within the trough 2 as the flights 12 move. The sand is then scraped up the slope of the trough and finally dropped into the disposal hopper 13 from the scraping end 1', thereby achieving the purpose of dewatering and transporting the sand.

In the present invention, the flight conveyor 1 is provided with the dewatering pit 3 having a regular filtration mechanism, so its solid-liquid separation ability is excellent and is effective in improving the functionality of the device.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of this invention, FIG. 2 is a partially longitudinal side view of a watering pit, and FIG. 3 is a perspective view of the main parts of this invention. In the figure, 1... flight conveyor, 2...
...Trough, 4...Coarse sand layer, 5...Sand settling basin, 10...
...Chain, 12...Flight, 13...Hopper, 14...Chain, 15...Bucket.

Claims (1)

[Scope of utility model registration request] In a sand transport device that uses a combination of a sand pumping mud mechanism such as a bucket conveyor or a sand pump, and a flight conveyor for transporting the sand, there is a sand pump made of coarse sand particles at the bottom of the running trough of the flight conveyor. A dewatering pit with a sand layer is provided, and the lifted sand is spread over the oversand layer to be used as oversand, and the water is drained, and excess sand accumulated on the oversand layer is scraped off and disposed of by shifting flights. A sand pumping and dewatering device characterized by: