JPS5935648B2 - Sand raking equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sand scraping device installed in a sand settling pond of a sewage treatment plant, etc., and more particularly to a device for adjusting the scraping surface of a sand settling packet in accordance with the amount of settled sand.

The structure of a conventional, odor-proof sand settling and scraping device that has been commonly used will be explained.

An endless chain wheel, on which multiple packets can be attached, is rotatably suspended between chain wheels installed at the front and back near the bottom of the sand settling basin and chain wheels installed at appropriate positions above the pumping basin. As the packet moves forward, the amount of sand scraped into the packet is gradually increased, and as the packet rotates around the head chain wheel at the forward end of the packet and moves upward, the packet is filled with sand. Then, the sand-filled packets were lifted onto the water surface and then discharged.

However, when a large amount of sand flows into the sand settling basin during heavy rains or when rain is suspended, the packets become buried in the sand and become overloaded, making it impossible for the raking equipment to resume operation. There was a drawback that inefficient sand removal work had to be continued due to the use of sandbars, etc.

It is an object of the present invention to solve the above-mentioned drawbacks and to provide a sand raking device in which a packet-equipped cheno can be freely tensioned so as to travel near the bottom of a sand settling basin according to the amount of sand settled.

The purpose of this invention is to arrange an underwater head chain wheel for suspending a rotating chain near the bottom of a sand settling basin, and to move the underwater head chain wheel across the suspended rotating chain (with a drive device). The submersible head chain wheel is driven by a drive device so that the rotating check 7 is always extended outward, and when the sand scraping load exceeds a predetermined value, the underwater head chain is moved by the drive device. By making it possible to pull the car into the rotating chain, the packets are prevented from being buried in the sand even if there is an abnormal increase in the amount of sand.

Next, the configuration of an embodiment of the present invention will be explained based on the drawings.

Figure 1 is a front view of the embodiment of the present invention, Figure 2 is A of Figure 1,
B, C, D, E, and F cross sections are shown.

In the figure, a chain wheel 5 is rotatably suspended between a driving chain wheel 2 installed above the pumping part of a sand settling basin 1, an underwater head chain wheel 3 installed near the bottom of the pond, and an underwater tail chain wheel 4 similarly installed. The packets 6 are attached to the cheno 5 at approximately equal intervals.

One end of an arm 8 having a fan-shaped gear 7 is pivotally mounted on both walls of the settling basin 1, and the underwater head chain wheel 3 is attached to the free end of the arm 8, and the free end of the arm 8 is moved. A support device 9 for a chain wheel 3 is formed so that an arc reciprocates in a direction approximately bisecting the angle θ between the chains 750 suspended between the underwater head chain wheel 3.

On the support device 9 is a sector gear 1 that meshes with the sector gear 7.
An arm 11 having a diameter of 0 is pivotally attached to both walls of a settling basin 1, and a winding rope 12 is wound around the free end of the arm 11.

One end of the winding rope 12 is connected to a winding device 13 on the sand settling basin 1, and the other end of the winding rope 12 is connected to a tension detector 14 fixed on the sand settling basin 1. Rope 12, winding rope 12, winding device 13, and tension detector 14
This serves as a drive device 15 for the support device 9, and constitutes a sand-slitter and scraper.

The operation of the above configuration will be explained.

The sand to be deposited on the bottom of the sand settling basin 1 is produced by rotating the chain wheel 5 and the packet 6 in the direction of arrow G by the driving chain wheel 2.

In order to cause the packet 6 rotating in the direction of arrow G to dig into the sand, the rope is wound up by the winding device 13 and the free end of the arm 11 is pulled upward.

This motion is transmitted to the arm 8 via the meshed sector gears 7 and 10, and the arm 8 is rotated in the direction of arrow J.

The arm 8 rotating in the direction of the arrow J extends the chino 5 so that the packet 6 bites into the sediment and scrapes off the sediment.

Next, when the amount of sediment accumulation increases and the tension of the chain exceeds the normal tension, the chain 5 attempts to pull up the arm 8 in the opposite direction to the arrow J, and the force is transmitted to the tension detector via the arm 11 and the rope 12. The winding device 13 relaxes the rope 12 in response to a signal from the tension detector 14 transmitted to the winding device 14 .

When the rope 12 is relaxed, the arm 8 and the arm 11 are free to move in the direction opposite to the arrows J and H, and the chain wheel 5 pulled by the drive chain wheel 2 pulls in the underwater head chain wheel 3, causing sedimentation. The packet 6 that has been bitten inside is pulled up onto the sand pile.

The packet 6 pulled up on the sand pile reduces the sand scraping resistance and brings the tension of the chain 5 within the normal tension.

When the tension of Cheno 5 falls within the normal tension range, tension detector 1
4 stops, and the winding device 13 stops relaxing the rope 12.

When the tension of the chain 5 falls below the normal tension range, the tension detector 14 issues a winding signal, and the winding device 13 performs the winding operation of the rope 120 until the signal from the tension detector 14 stops. supports the underwater head chain wheel 3 so as to be movable so as to almost follow the direction of the resultant force of the tension of the chain 5, reduces the movement resistance of the underwater head chain wheel 3, and faithfully changes the tension of the chain 5. This is transmitted to the tension detector 14.

Incidentally, an intermediate wheel 16 may be attached to the free end of the arm 11 to limit the swing of the chino 5 on the return side.

As explained above, the present invention is directed to a sand raking device in which a drive device equipped with a tension detector is connected to a support device that supports the underwater head chain wheel 3 so as to be movable in the direction of the resultant force of the tension of the chain. Therefore, the movement resistance of the submersible head chain wheel 3 is reduced, and the support device faithfully transmits the increase and decrease of the tension of the chain to the tension detector, thereby making it an effective sand scraping device that operates sensitively to sediment accumulation. was completed.

[Brief explanation of the drawing]

FIG. 1 is a front development view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along lines A, B, C, D, E, and F in FIG. 3: underwater head chain wheel, 5: chain wheel, 6: packet, 9: support device, 15: drive device of the support device, 0: angle at which the chain wheel is suspended on the underwater head chain wheel.

Claims (1)

[Claims] 1 In a sand-slitter scraper in which a chain wheel is provided near the bottom of the sand settling basin and above the pump, and a chain wheel for attaching a packet to the chain wheel is rotatably suspended, the submersible head chain wheel 3 is installed at the free end of the arm 8. A rotating chino 5 is suspended from the chino 5, and one end of the arm 8 is pivoted to a thin wall so that the tip of the arm 8 draws an arc in a direction that approximately bisects the angle Q formed by the chino 5. A sand raking device characterized in that it is equipped with a drive device 15.