JPS5931286Y2 - Sand raking equipment - Google Patents

Description

[Detailed description of the invention] This invention relates to a sand raking device installed in a sand settling basin in a sewage treatment plant, etc., and particularly relates to a sand raking device that can operate smoothly even when a large amount of sand flows into the sand basin. It is something.

The fixed packet type shown in Figure 1, number g, is often used as a conventional sand settling and scraping device.

A discharge chute 2 is installed above the sedimentation tank 1, and a submersible head wheel 4 is installed on the upstream side at the bottom end of the pond, a submersible tail wheel 3 is installed on the downstream side, and a drive device (not shown) is installed above the discharge chute 2. ) A driving wheel 5 and a wheel 6 are connected to each other. An intermediate wheel 1 is rotatably arranged below the wheel 6, and an endless chino 8 is rotated around these wheels 3, 4, 5, 6, and 7. A plurality of draining packets 9 are attached to the endless chain 8 so as to be freely wound around the draining packets 9 and can be opened in the rotating direction.

While the packet 9 rotating together with the cheno 8 moves from the submersible tail wheel 3 to the submersible head wheel 4, it scrapes up the sediment accumulated on the bottom of the settling basin to the upstream side, and from the submersible head wheel 4 to the driving head wheel 4. The sand raked up while moving towards the wheel 5 is raked up above the discharge chute 2 and drained.

When the draining packet 9 passes the driving wheel 5, the packet 9 is overturned and discharges the sediment into the discharge chute 2.

The packet 9 returns from the wheel 6 via the intermediate wheel 7 to the underwater tail wheel 3 again.

By repeating this process, the sediment accumulated in the settling basin is removed.

However, during heavy rains or typhoons, a large amount of sediment flows into the settling basin, and the submersible wheels become buried in the sediment, making the device inoperable and requiring a large amount of manpower to recover.

In view of the drawbacks of the fixed packet type sand scraper as described above, the object of this invention is to provide a sand scraper that can avoid burying of the equipment due to sediment even if the amount of sand flowing in increases.

In a packet-type sand settling and scraping machine, sediment is gradually scraped from the submersible tail wheel section to the submersible head wheel section, so the maximum load is generated on this submersible head wheel section, and this load amount or the allowable load amount If it exceeds the limit, it becomes overloaded and becomes inoperable.

The purpose of this invention is to automatically raise the submersible head wheel when a load exceeding a certain set load is applied, in order to avoid an inoperable state due to overload of the submersible head wheel. This allows raking operation to be performed under constant load conditions while avoiding overload.

The configuration of this invention will be explained with reference to figures of embodiments.

FIG. 2 shows an embodiment of the present invention, and parts common to those in FIG.

In the figure, on the downstream side of the hopper 2, an intermediate wheel 10 is added between the tension wheel 6 and the intermediate wheel 1, on which the chain 8 is wound.

The underwater head wheel 4 at the bottom of the pond is pivotally supported by the lower end of a rack arm 11, and the rack arm 11 is driven by a pinion gear 13 so as to be raised and lowered in conjunction with a drive device 12 on the oil.

The wheel 6 is movably supported on the bearing guide 14.

The wheel 6 is movably supported on the bearing guide 14.

A winding device 15 interlocked with the drive device 12 is provided, a rope 16 of the winding device 15 is connected to the bearing of the wheel 6, and the rope 16 is wound around the rope sheep 11.

Further, the rack arm 11 is slidably supported within a guide 18 fixed to the side wall of the pond.

Furthermore, the tension of the cheno 8 (the amount of load during sand raking can be detected as the tension of the cheno).

) is electrically connected to a tension detector (not shown) for detecting the force.

If the tension of the chain exceeds the set value, the underwater head wheel 4
The drive device 12 rotates forward and backward in the direction of raising the underwater head wheel 4, or in the direction of lowering the underwater head wheel 4 when the tension of the chain is less than the set value.

Next, the operation of the above configuration will be explained.

First, at the start of operation, the submersible head wheel is at the lowest position, and the chain 8 rotates, and the packet 9 attached to the chain 8 scrapes up the sediment.

If the amount of sand raking load is large, the drive device 12 is actuated by an electric signal from the tension detector 18 to raise the submersible head wheel 4, and the tension wheel 6 is raised by a winding device interlocked with the drive device 12. The driving device 12 is moved to the right on the bearing guide 14, and when the looseness of the cheno 8 is tightened, the driving device 12 is stopped when it comes to a position where the sand raking load amount becomes the set value.

The operation continues in this state, and when the sand raking load becomes 1 or less than the set value, the drive device is activated again by the electric signal from the tension detector to lower the underwater head wheel 4 and move the tension wheel 6 to the left. let

When the sand removal load amount reaches the set value, the drive device 12 stops.

As explained above, the present invention allows the submersible head wheel to be operated continuously with the sand removal load always constant.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a conventional sunken object scraping device, and FIG. 2 is a diagram of a sunken object scraping device according to an embodiment of the present invention. 4.6, 10: Wheel, 11 Nirakku arm, 13:
Pinion gear, 14: Bearing guide, 15: Winding machine.

Claims (1)

[Scope of utility model registration request] In a sand-sloughing device in which wheels are provided near the bottom of a sand-settling basin and on top of the oil, and a chain for attaching packets to these wheels is rotatably suspended, an underwater head wheel 4 is installed at one end.
1. A sand raking device characterized by being provided with a drive device 12 for raising and lowering a rack arm 11 that supports a rack arm and moving a tension wheel 6, and a tension detector for operating the drive device.