JPH0326883Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is applied to a sediment scraping machine that scrapes up sludge deposited in a settling pond of a sewage treatment plant, etc. using buckets attached to the main chain at arbitrary pitches. If the conveyor on the front side of the submersible shaft connected to the bucket conveyor is likely to be buried due to a large amount of sediment flowing in during rain, etc. When the load of the main chain reaches the set lifting load or more, the front side of the submersible shaft This invention relates to a swing-type sand settling and scraping machine that automatically swings its parts to absorb slack in the main chain while preventing the conveyor from being buried.

[Conventional technology and its problems]

Conventionally, a sediment scraping machine has been widely used in which a large number of buckets are attached to a main chain that runs along the pond bottom, and the sediment is successively scraped up and discharged by the buckets to remove the sediment deposited on the bottom of the sediment pond. However, the bucket conveyor that runs along the bottom of the pond may become buried if a large amount of dirt temporarily flows in, such as during rain. In order to prevent the bucket conveyor from being buried, a method has been proposed in which the bucket conveyor on the inflow side (upstream side) of the pond is temporarily raised. Since the overall length of the main chain does not change by raising this inflow side conveyor, the main chain becomes slack somewhere between the submersible shaft and the sprocket wheel fixed to the shaft provided above the water surface. This may lead to accidents such as breakage of the main chain. To prevent this, one sprocket wheel that is engaged with the main chain is moved up and down using a weight or cylinder to absorb the slack in the chain. However, this method has the drawback that the number of axes having sprocket wheels increases and the structure becomes complicated.

[Means to solve problems]

In view of this, the present invention has been developed by attaching the upstream sprocket wheel to the swing lever when the inflow side of the bucket conveyor swings to prevent burying, without increasing the number of sprocket wheels.
It is designed to automatically swing to absorb the slack of the main chain.

〔Example〕

The present invention will be explained below based on the illustrated embodiments. In the figure, P is a sand settling basin, and an endless main chain 15 is connected between the discharge hoppers 8 that carry out sand scraping and discharge along the bottom of the settling basin and at a position above the pond.
A bucket conveyor is provided in which the chain 15 is provided with a large number of buckets 16 at required intervals. The main chain 15 of this bucket conveyor is
Driving sprocket wheel 1 and tensioning sprocket wheel 2 located in Ikegami and driven by a driving source.
A swinging sprocket wheel 3 above the water surface on the upstream side of the pond, a fixed sprocket wheel 4 provided above the water surface on the downstream side of the pond, an underwater sprocket wheel 5 on the downstream side of the pond, and an underwater sprocket wheel 6 on the upstream side of the pond. The buckets are meshed with each other and driven at a required speed by the drive sprocket wheel 1, and as the bucket moves along the pond bottom, it scrapes off the sediment and discharges it from the water to the top of the water to the discharge hopper 8. .

As shown in the figure, the swinging sprocket wheel 3 is rotatably supported at the tip of a swinging lever 9 which is swingably supported on a shaft 10 provided on the pond wall. A sprocket wheel 7 may also be provided. Underwater sprocket wheel 6
is rotatably supported at the tip of a swing lever 12 which is swingably supported on a shaft 11 provided on the pond wall.

Reference numeral 13 is a stopper provided to limit the maximum swing when the swing lever 12 swings upward, and 14 is a stopper provided to limit the maximum swing position (during normal operation) of the swing sprocket wheel 3. The stopper 13 and the fixing metal fittings 14 also function as a reversal lock when the bucket conveyor rotates in the opposite direction. Also, the swing lever 9
In some cases, weights are set considering the balance of the main chain. In the embodiment shown in FIG. 2, the midpoint of a swinging lever 9 is pivotally supported on a shaft 10, and swinging sprocket wheels 3, 7 are attached to both ends of this lever.
The other features and functions are the same as those shown in FIG. 1.

[Effect]

Below the main body frame where the driving sprocket wheel 1 and the tensioning sprocket wheel 2 are installed, a submersible sprocket wheel and a swinging sprocket wheel are installed on the upstream side of the pond, so if a large amount of sediment flows into the settling basin, The bucket conveyor at the submersible sprocket wheel on the upstream side of the pond is buried by the inflowing sediment, and the load for raking the sediment becomes larger than the set load. Due to this increase in load, the swing lever 1
The tip of the submersible sprocket wheel 6 rises in an attempt to escape the load. As the wheel 6 rises, the main chain inevitably becomes slack between the tension sprocket wheel 2 and the fixed sprocket wheel 4 on the downstream side of the pond. At this time, the swinging sprocket wheel 3 located between both wheels 2 and 4
is swingably supported by the swing lever 9, so that by raising the sprocket wheel 6, only the slack of the main chain is reduced by the weight of the bucket conveyor.
The lever 9 swings downward due to its own weight or the like. This is because the weight of the main chain/bucket becomes lighter when the upstream submersible shaft is raised, and the balance of the moment is lost, so that the swing lever 9 swings downward.

As mentioned above, when the submersible sprocket on the upstream side of the pond rises and falls due to changes in load, the oscillating sprocket wheel automatically moves up and down accordingly to absorb the slack in the chain, keeping the chain tensioned at all times. Prevents the chain from being cut or coming off the sprocket wheel.

[Effect of idea]

According to the present invention, when the upstream side of the bucket conveyor moves upward due to load, the slack of the main chain can be absorbed by swinging a part of the sprocket wheel provided above the water as a lever mechanism, which is a simple method. The structure allows normal operation even when a large amount of earth and sand flows in, and has the advantage of being easily applicable to existing sand settling and scraping machines.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows a different embodiment, in which a shows a longitudinal front view, b shows a side view, and c shows a plan view. P is a settling basin, 1 to 7 are sprocket wheels,
8 is a discharge hopper, 9 and 12 are swing levers, 1
0 and 11 are shafts, 13 is a stopper, 14 is a fixture, 15 is a main chain, and 16 is a bucket.

Claims (1)

[Scope of utility model registration request] A sand-settling scraper comprising a driving sprocket wheel provided above a sand-settling basin, and driven sprocket wheels disposed in the basin and above the basin, and in which a chain with a bucket attached to each sprocket wheel is stretched. , the inflow side sprocket wheel at the bottom of the pond is configured to be movable up and down with a swing lever,
Furthermore, the swinging sprocket wheel, which is one of the driven sprocket wheels installed between the driving sprocket wheel and the outflow side sprocket wheel at the bottom of the pond, and is located under the slab, absorbs slack by swinging. What is claimed is: 1. A sand-settling and scraping machine characterized by being supported by a swinging lever and provided with a fixing fitting above the swinging sprocket wheel for regulating the maximum swinging position of the swinging sprocket wheel.