JPS6231124Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for efficiently lifting sand in a long sand settling basin using a compact device.

When the conventional sand settling device in a long sand settling basin is installed near the center of the sand settling pit, the screws on the upstream and downstream sides are driven separately. Because the screw conveyor was installed in the center of the pond, there were problems such as the inability to install a sand pump. Furthermore, if separate drives are used, two sets of drive devices are required, which is unreasonable, such as poor efficiency and high cost.

In view of this, the present invention provides a sand settling and lifting device that is compact, efficient, inexpensive, and requires longer maintenance and repair intervals, and will be described below based on the illustrated embodiment.

In the figure, 1 is a long settling basin, and a settling pit 2 is provided near the center of this settling basin in the longitudinal direction of the basin, that is, in the direction of water flow. This sand settling pit is provided so that when viewed in cross section in the short direction of the sand settling basin, it is deeper on the side where the sand pump is installed, and a slope is provided on the bottom surface so that the sand scraped by the screw can slide down toward the sand pump side. A screw conveyor 3 is installed in the longitudinal direction of the settling basin 1 and at the bottom thereof, but the screw conveyors are twisted in opposite directions on the upstream and downstream sides of the settling pit 2 of the settling basin. I will make it happen. That is, upstream screw 3
If a is a rightward twist, then the downstream screw 3b
is twisted in the left direction, and the upper and lower screws 3a and 3b are connected by a shaft joint or the like in the center of the settling basin, that is, in the settling pit, to form a single screw conveyor 3. In this case, either a drive device is provided at the connecting portion of both screws, or they are connected via a gear box 4 fixed to the pond as shown in the figure, and a drive shaft 6 or a transmission mechanism such as a chain is connected to the drive device 5 installed on the pond. The gear box is driven through the screw conveyor to rotate the screw conveyor in the same direction. The twisting directions of both screws are such that even if the screws are driven in the same direction, the sand is collected into the sand pit in the center of the sand settling basin.

Further, the tips of both the upstream and downstream screws are rotatably supported by bearings 7, and the installation center of this screw conveyor 3, that is, the axis of the screw conveyor, is on either side of the center of the sand settling basin. For example, it is installed as shown in FIGS. 2 and 3.
In the sand pit, the lower bottom surface of this screw conveyor 3 is a slope surface 2a, and a sand lifter 8 is installed at the deeper side of this slope, and its position is offset from the axis of the screw conveyor. The sand collected in the pit is lifted and discharged to the outside of the pond using a sand pump.

In addition, the bottom of the sand settling basin other than this sand pit is fitted with a screw conveyor 3 as shown in Fig. 3.
A shaped trough 9 is formed, and the pond bottom has a slope surface 1a so that all the sediment in the pond falls into this trough.
It is becoming.

Any sand pump, air lift, bucket elevator, etc. can be selected as the sand pump, and its installation position is in the deep part of the sand settling pit, on the side opposite to the screw conveyor with respect to the center of the pond. In addition, if the sand settling pond is wide enough that a sand pump can be used to connect the upstream and downstream screws at the center, the screw conveyor may be installed at the center of the pond.

Further, although the above screw conveyor is driven by the top surface of the pond slurp, it can be driven underwater, upstream of the pond, in the middle of the pond, or underground, and can be driven by an electric motor in addition to a hydraulic motor.

In the apparatus configured as described above, when the drive device installed on the slab is rotated, the rotation is transmitted to the gear box fixedly provided in the waterway via the drive shaft. The output shaft of the gearbox is connected to the upstream and downstream screws, and the upstream and downstream screws are twisted in opposite directions, so even if they are rotated in the same direction, the sand will not be scraped into the sand pit located near the center. It is sent.

The sand raked into the sand pit slides down the slope of the sand pit and is collected on the side of the sand pump, and is lifted without moving the sand pump.

According to the present invention, in a long waterway, the screw shaft can be made smaller and lighter than when a sand pit is provided in the center, driven at the center, and an integral screw is used over the entire length of the waterway and driven on the upstream or downstream side. Since wear of the bearings, screw blades, and troughs can be reduced and maintenance and repair intervals can be extended, the device can be made inexpensive and labor-saving. This is because when one drive is used on the upstream or downstream side, the entire length of the load is generated at the joint between the output shaft of the drive device and the screw, so the shaft must be made larger, and the size of the shaft gradually becomes smaller than that on the drive side. However, if the size is gradually reduced, the manufacturing time and cost will increase, so it is usual to have the same shape and dimensions over the entire length.
Furthermore, as the distance between the bearings increases, the deflection due to its own weight increases. Since the equivalent bending moment and equivalent torsional moment become larger, the shaft must be made larger, which increases the dead weight and accelerates the wear of the bearings and the screw vanes and troughs. If a sand pit is installed near the center of the pond and driven centrally, the upstream and downstream screws will generate 1/2 the load at the joints with the driving device compared to a system in which the screws are installed along the entire length. By reducing the distance between the bearings to 1/2, the torsional moment is reduced to 1/2, and the bending moment is reduced to 1/2 even if the weight per unit length is the same.
8, the shaft diameter can be made smaller and the weight itself can be reduced, making it possible to provide the above-mentioned inexpensive and labor-saving device. By using a central drive, it is possible to scrape up sediment over the entire length of the pond.
There is no scraping left behind, which prevents sediment from rotting in the settling basin. This is because, in the case of central drive, the drive device can be installed above the sand settling pit, and the settled sand slides down the slope of the sand settling pit toward the sand lifter, leaving no residue on the drive device section. Until now, the method of installing an integrated screw along the entire length was to install a settling pit on the upstream side and a drive device on the outflow side, but the drive device required an installation space of 800 to 1000 mm square, and it was necessary to install a settling pit on the downstream side of the settling basin. This created a dead space of 800 to 1000mm, which caused the sediment to rot, but if a settling pit was installed in the center, only bearings would be needed at the upstream and downstream ends, which would be approximately 200mm.
A dead space is fine. There are also cases where no bearing is provided. Furthermore, compared to a system in which the upstream and downstream screw conveyors are driven individually and moved to the center, the central drive system according to the present invention requires only one set of drive units to generate the same power per channel, reducing manufacturing and installation costs. It is possible to provide an inexpensive sand raking machine. Up until now, separate upstream and downstream drives were used because there was not enough space to install the sand lifter, which resulted in expensive separate drives, but with this invention, the sand lifter can be installed even if the drive unit is installed in the center. It has advantages such as:

[Brief explanation of the drawing]

Figure 1 is a vertical front view, Figure 2 is a vertical side view of the settling pit, Figure 3 is a vertical side view of the settling basin, and Figure 4 is a vertical side view of the settling basin.
The figure is a sectional view of the drive section. 1...Sand basin, 1a, 2a...Slope surface, 2
...Sand pit, 3...Screw conveyor, 4
... Gearbox, 5 ... Drive device, 6 ... Drive shaft, 7 ... Bearing, 8 ... Sand lifter, 9 ... Trough.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A sand settling pit is provided near the center of a long sand settling basin, and the twisting directions of screws on the upstream and downstream sides of the sand settling basin are opposite to each other, A screw conveyor is provided which is driven in the same rotational direction to scrape the sand into the sand pit, and the screw conveyors on both the upstream and downstream sides are connected and driven within the sand pit, and the screw conveyor is installed. A sand settling device in which the center and the installation center of the sand pumping device installed in a sand settling pit are arranged in opposite directions with the center of the pond in between. (2) The driving device for the screw conveyor is placed above the water surface above the sand pit, and the screw conveyors are driven in the same direction via gear boxes connected in the sand pit of two screw conveyors with opposite twisting directions. A sand settling and lifting device according to claim 1 of the utility model registration claim.