JPS5847206B2 - Sand raking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sand raking device, and more particularly to a sand raking device suitable for raking up sand accumulated in a settling basin of a sewage treatment plant, a drainage pump station, or a waterworks.

BACKGROUND ART Conventionally, as a sand raking device, one is known in which, for example, a fly is attached to a chain attached to a pond bottom, and the chain is driven by an electric motor to scrape sand from the pond bottom.

However, with this type of equipment, if there is abnormal accumulation of sand on the bottom of the pond due to rainwater flowing in, it may become difficult to rake or damage the equipment, and the sliding parts are always under water. Because of this, corrosion is promoted and it is necessary to empty the pond during maintenance inspections.

Furthermore, a conventional method is known in which a screw is provided at the bottom of the pond and is driven by an oil or submersible electric motor to scrape sand from the bottom of the pond.

However, in this type of equipment, the civil engineering structure has a special shape, and the reduction gear, drive unit, screw, etc. are located below the water surface, which promotes corrosion. A special seal mechanism is used to prevent sand from entering the pond, but it has a short lifespan and requires replacement after emptying the pond.

Furthermore, there is also known a method in which a raking blade is suspended below the water surface from a running body installed on oil to perform raking.

With this type of device, maintenance and inspection can be carried out on the water surface, making inspection easy. However, if there is abnormal accumulation of sand on the bottom of the pond, the raking blades may float up, making it difficult to rak the sand. It is certain.

Furthermore, in order to improve the working environment of sand settling basins, it has recently become necessary to provide a protective cover over the oil, and the structure must be able to meet these demands.

The present invention was devised in view of the current situation, and its purpose is to provide a sand raking device that can perform reliable raking, is free from corrosive wear, and is easy to maintain and inspect.

In the present invention, a scraping slide arm is provided on an arm that scrapes along an endless guide so as to be able to swing and move up and down, and when the load exceeds a certain level, the scraping slide arm is raised so that the load is always constant. It is constructed so that the sand can be collected by raking.

The present invention will be described below based on an illustrated embodiment.

In the figure, reference numeral 1 denotes a waterway, and on the waterway wall 2 of the waterway 1, an endless chain 3 is stretched across opposite sides of both walls, and an endless guide 4 is provided below the chain.

An upper end portion of an arm 6 with rollers is attached to the endless chain 3 via a running body 5, and the roller 7 is movable along the guide 4.

A telescope 8 is attached to the lower end of the arm 6 with a roller via a pin 9 so as to be able to swing in the raking direction.
is arranged so that the telescope 8 is vertically supported in an unloaded state.

The telescope 8 is provided with a scraping slide arm 11 that can be slid up and down and a cylinder 12 that raises and lowers the slide arm 11, as shown in the figure.

A scraper 13 for scraping up sediment 14 is attached to the lower end of the scraping slide arm 11.

In the figure, WL indicates the water level, and in FIG. 1, FL indicates the upper end level of the water channel 1, and P indicates the pump.

Next, the effect will be explained.

When the endless chain 3 is driven by a motor or the like (not shown), the endless chain 3 is driven in the direction shown by the arrow in FIG.

Along with this, the roller arm 6, the telescope 8, the scraping slide arm 11, etc. also move along the guide 4, and the conveying tag scraper 13 makes a reciprocating elliptical movement as shown by the chain line in FIG.

The sediment 14 on the bottom of the pond is collected at one point.

The collected sediment 14 is discharged to the outside of the waterway 1 by a pump P.

Next, as shown in FIG. 2, if there is a large amount of sediment 14, the scraper 13 will catch on the sediment 14, and the telescope 8 will tilt against the biasing force of the buffer device 10.

Then, a detector (not shown) is activated, causing the cylinder 12 to contract and the scraping slide arm 11 to rise.

When the slide arm 11 rises, the load applied to the scraper 13 decreases as shown in FIG. 3, so the scraping slide arm 11 becomes vertical as shown in FIG. 4 due to the biasing force of the shock absorber 10.

Then, the accumulated sand 14 is scraped up sequentially from the upper layer.

Incidentally, the cylinder 12 will be extended again during the next scraping operation, and the operations shown in FIGS. 2 to 4 will be repeated thereafter.

As explained above, according to this embodiment, even if the sand is abnormally accumulated, it can be reliably raked, and there is no fear that the equipment will be damaged due to overload.

Furthermore, since the driving part is located above the water surface, there is no corrosion or wear, and maintenance and inspection are easy.

In the above embodiment, the case where an endless chain is used to move the scraper in a reciprocating elliptical motion has been described, but the same effect can be expected by using a wire rope, a rack and pinion, or the like.

Further, although the cylinder inclination detection means was not particularly described in the above embodiments, any device such as a limit switch, a load detector, a reed relay, or a differential transformer can be used.

The present invention has been described above based on the preferred embodiments. According to the present invention, even if sand is abnormally accumulated, it can be reliably raked up, and there is no risk of equipment damage.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIGS. 2 to 4 are schematic diagrams each showing operating states during abnormal sand accumulation. 3...Endless chain, 4...Guide,
6...Arm with roller, 8...Telescope, 11...Kakiyoshi slide arm, 12
...Cylinder, 13...Scraper.

Claims (1)

[Claims] 1 In a sand raking device that rakes sediment accumulated on the pond bottom to a single point in the pond, there is an arm that runs along an endless guide for raking, and a machine frame that is pivoted to this arm and swings in the raking direction. and a scraping slide arm that can be raised and lowered within this machine frame, and when a load above a certain level is applied to the scraping slide arm and the machine frame tilts, the scraping slide arm rises to adjust the load. A sand raking device characterized by: