JPS6119764Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for smoothly scraping up sand in a sand settling basin.

Part or all of the bucket conveyor for sand removal may become buried by the inflow of sand during suspension of operations or when the amount of sediment that flows into the settling basin temporarily exceeds the lifting capacity due to rain, etc. is often the case. In this condition, the bucket conveyor may be overloaded and damage the bucket conveyor or the drive system.

The present invention was developed in view of this.

In the figure, reference numeral 1 denotes a settling basin installed in a sewage treatment plant or the like having the required settling capacity, and the settling basin 1 is equipped with a bucket conveyor 2 for scooping up and discharging the settled sand. This bucket conveyor 2 has a large number of buckets B protruding from an endless chain.
This conveyor 2 is attached to submersible sprocket wheels 3a and 3b installed at the bottom of the pond, a drive sprocket wheel 4, a take-up sprocket wheel 5, and a guide sprocket wheel 6 installed above the pond water surface.
It is stretched between a, 6b, and 6c.

These submersible sprocket wheels 3a, 3b are rotatably supported via support shafts 8a, 8b at both front and rear ends of a conveyor frame 7 arranged on the pond bottom in the front-rear direction of the pond. The conveyor frame 7 is pivotally supported on the bottom of the pond via a side wall or a bracket, and the front end of the conveyor frame 7 swings vertically about the support shaft 8b as a fulcrum.
Further, the front end of the conveyor frame is raised and lowered by a conveyor frame lifting device 9 using the support shaft 8b as a fulcrum. As shown in Fig. 1, this conveyor frame lifting device has a cylinder and a machine frame F installed above the pond.
A hoisting machine or the like is provided, whereby a part of the conveyor frame is fastened via a wire rope W, and the frame is swung by hoisting or lowering the wire rope, or by operating a cylinder, or as described below. This is done via a bucket conveyor by movement of a take-up sprocket wheel. The bucket conveyor is driven by driving a drive sprocket wheel 4 with a motor M, which may be at a constant or variable speed.

The sprocket wheel 5 for take-up is
A bearing 11 is supported on the guide 10, and the tension of the bucket conveyor can be adjusted by moving the bearing 11 by rotating a screw rod 12. Although the screw rod 12 is rotated manually, the conveyor frame When used for swinging purposes, it shall be driven by a reversible motor.

When performing normal sand scraping using the sand settling and scraping machine configured as described above, the bucket conveyor 2 is driven by driving the motor M, and the sand is scraped up by each bucket. Discharge machine C
are sequentially discharged to At this time, the reaction force applied to the conveyor frame is supported by the support shaft 8b, but is not strong enough to cause the conveyor frame to rise. The weight of the conveyor frame is set so that the front end of the conveyor frame cannot be lifted during normal sand removal.

If the amount of inflowing earth and sand increases temporarily due to rain, etc., or if the bucket conveyor is buried or about to be buried during suspension of operation, if a load exceeding the set value is applied to the bucket conveyor, the reaction force will also increase on the conveyor frame. Even if the reaction force increases, the conveyor frame is supported by the support shaft 3b, so it will not move backward in the direction of the reaction force, but in response to the increased reaction force, the front end side of the conveyor frame will be The conveyor frame is lifted up, the front part of the bucket conveyor is no longer buried, the raking resistance is reduced, and the load becomes normal, and the raking of the sand continues, and as the sand raking progresses, the conveyor frame gradually descends under its own weight. . In this way, the sand can be scraped up smoothly without affecting the bucket conveyor or drive device.

According to the present invention, the weight of the conveyor frame equipped with submersible sprocket wheels is determined so that the front end side of the conveyor frame equipped with submersible sprocket wheels is lifted due to an increase in the load applied to the bucket conveyor, and the rear end side of the frame is rocked to raise the front end of the frame. Since it is movably supported, the load on the bucket conveyor can be automatically adjusted, so even if the bucket conveyor is buried due to inflow of more soil than its lifting capacity, the amount of inflowing soil will not increase temporarily. However, by slightly raising the front end of the conveyor frame, there is an advantage that the sand can be scraped up smoothly.

In the present invention, when the bucket conveyor is not in operation, the front end of the conveyor frame may be raised and kept on standby.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal front view, and FIG. 2 is a side view of the same, with the left half seen from the rear of the conveyor frame and the right half seen from the front. 1...Sand basin, 2...Bucket conveyor, 3a,
3b... Submersible sprocket wheel, 4... Drive sprocket wheel, 5... Take-up sprocket wheel, 6a, 6b, 6c... Guide sprocket wheel, 7... Conveyor frame,
8a, 8b...Support shaft, 9...Conveyor frame lifting device, 10...Guide, 11...Bearing, 12
...screw rod, B...bucket, C...discharge machine, F
...Machine frame, M...Motor, W...Wire rope.

Claims (1)

[Scope of utility model registration request] In a sand-sloughing machine that has a bucket conveyor arranged along a sand-settling pond to scrape up sand, the conveyor has a submersible sprocket wheel that meshes with the bucket conveyor and is arranged along the bottom of the pond. The weight of the conveyor frame is supported by the front and rear ends of the frame, and the rear end of the conveyor frame is supported on the pond side so that when an overload is applied to the bucket conveyor, the front end of the conveyor frame can be lifted up by itself. A sand raking machine characterized by being set.