JPS5910278B2 - sludge scraper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for removing sediment,
This invention relates to a sludge scraping machine for scraping up and removing sludge such as condensation or scum floating on the water surface.

Conventionally, the flight conveyor type sludge scraper used in this type of sedimentation tank, etc., has two chains 1 connected endlessly, and scum scraping plates are placed at regular intervals, as shown in Figure 1. 2 and connect it to the four underwater axes 3, 4, 5, 6.
Each sprocket installed in , 8, 9, and 10, and the shaft 3 disposed at the upper part of the sedimentation tank is connected to the drive device 11, and serves as the drive shaft of the chain 1, and the water flows along the upper side of the chain 1 as shown by the arrow. It is designed to be driven in a circular manner so as to move along the direction.

In such a conventional sludge scraper, the chain 1 is driven by the drive shaft 3 at the upper end so as to push out the top of the guide rail 12, so if the slack portion 1b is not long enough, the chain 1 will not be horizontal. The force pushing part 1a becomes strong enough that chain 1 and drive sprocket 1 come off as well.

Therefore, the length of the horizontal portion 1a of the chain that acts to scrape up the scum must be shortened, and as a result, the scum scraping action is not sufficiently carried out to the position of the scum schimmer at the rear. was there.

Moreover, in the conventional sludge scraper, as shown in FIG. Since the sprocket 15 is mounted quite close to the center of the shaft 3, the chain 16 wound around it becomes an obstruction, and the width of the raking plate 2 had to be made considerably shorter than the width of the pond.

As a result, the scum scraping width became narrower, leaving unscavenged scum on both sides of the water surface, emitting a foul odor, and also requiring corbels 1γ on both sides of the pond bottom. .

Furthermore, the adjustment to correct the tension state of the chain 1 is performed on the shaft 5 located diagonally to the drive shaft 30, but since this adjustment shaft 5 is located at the bottom of the pond, it is difficult to adjust this shaft 5. , the drawback was that it could only be done by emptying the pond.

This invention was made in order to solve the above-mentioned conventional drawbacks, and the chain is driven by a shaft disposed at the rear upper part, and the driven sprocket of the drive shaft is housed in the cut arrow part of the side wall. In addition, the tension of the chain is adjusted at the upper shaft at the front end, thereby making the horizontal part of the chain sufficiently long, increasing the width of the raking plate, and greatly improving the raking efficiency. ,
The object of the present invention is to provide a sludge scraper in which the chain tension can be adjusted during operation.

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 3 is a schematic side sectional view showing the sludge scraper of the present invention installed in settling tank A, and FIG. 4 is an enlarged cross-sectional view of the drive mechanism. A large number of scraping plates 2 extending in the width direction of the sedimentation tank A are attached at predetermined intervals using endless chains.

Four rotating shafts 3, 4, 5, and 6 are arranged at the front and rear upper and lower parts of the sedimentation tank A, and sprockets 7, 8, 9, and 10 are installed on each of these shafts, respectively. The endless chain 1 is wound around these sprockets.

Among the shafts 3, 4, 5, and 6, the shaft 4 located at the rear upper part on the scum scraping side is a drive shaft, and the sprocket attached to this shaft is a drive sprocket.

Therefore, the other shafts 3, 5, and 6 are driven shafts, and the other sprockets are driven sprockets.

The drive shaft 4 is rotated by a transmission sprocket 15 attached to the shaft 4 via an intermediate transmission device 18 from a drive device 11 disposed above the rear part of the sedimentation tank A. .

The drive shaft 4 is a bearing mounted on a pedestal 20 fixed to a notched step 19 cut from above the sedimentation basin side wall 14. 13
A transmission sprocket 15 is mounted on the protruding end of the transmission sprocket 15 so as to be located within the notched step 19, and is connected to an intermediate transmission device 18 via a chain 16.

The driven shaft 3 located at the front upper part of the settling tank A is supported by a bearing 22 of a tension adjustment device 21 attached to the side wall 14, and this bearing 22 is supported by a threaded rod 23 provided in the longitudinal direction of the chain 1. By rotating the threaded rod 23 with a lever 24, it can be moved back and forth along a guide 25.

Therefore, when the threaded rod 23 is rotated via the lever 24, the driven shaft 3 is moved back and forth via the bearing 22, whereby the tension of the chain 1 can be adjusted freely. It is.

A rotary scum discharge device 26 is disposed at the rear of the drive shaft 4, and this is connected to the intermediate transmission device 18.
It is designed to be rotated by a chain 27.

This device 26, as shown in FIG.
In between, a discharge pipe 30 having an inlet 29 formed by opening the upper part of its circumferential surface is installed so as not to rotate, and a scum pump is installed between flanges 31 fixed to the hollow rotation shafts 28, 28. Lifting members 32, 32 are fixed at a required interval, and a chain 27 is attached to the hollow rotating shaft 28.
A transmission sprocket 33 is provided which is rotated by.

Therefore, through the conduction sprocket 33, the hollow rotation shaft 29
When the pump rotates, the pumping member 32 is rotated around the hollow rotating shaft 29, and at this time, the scum is pumped up and dropped from the inlet 29 into the discharge pipe 30. .

The scum that has entered the discharge pipe 30 moves in the axial direction, and its ends are also discharged and removed to the outside.

In this embodiment, the pumping member 32 is formed into a flat plate shape, but the shape of the pumping member 32 can be changed to any other suitable shape.

The solid matter in the water that enters the sedimentation tank A equipped with the sludge scraper of the above configuration is naturally separated by its own weight, with light scum etc. floating on the top of the water, and heavy solid matter etc. It begins to settle to the bottom 34 of the pond.

Therefore, the sludge scraper is operated by rotating the drive sprocket 8 from the drive device 11 via the intermediate transmission device 18.

The chain 1 moves in the direction of the arrow in Figure 3, that is, the upper horizontal part 1a moves from the front of the pond A to the rear, and the bottom part 1c of the chain moves in the opposite direction from the rear of the pond A to the front. It will be moved towards

As a result, the solid matter that has settled on the bottom 34 of the pond is sent by the scraping plate 2 to the sedimentation sludge reservoir 35 provided at the front of the pond A, and from there, it is discharged outside the pond A. .

Further, scum and the like floating on the top of the water are sent backward by the scraping board 2, pumped up by the scum discharge device, and discharged to the outside of the pond A.

As explained above, in this invention, the scum scraping side at the rear upper part of the sedimentation basin is used as the drive shaft of the chain, so that the upper horizontal part of the endless chain is forcibly drawn.
It will be driven in circulation.

Therefore, the upper horizontal part of the endless chain can maintain sufficient tension, and there is no sagging or rising phenomenon, so this horizontal part can be made much longer than before.
The scum scraping effect is significantly improved.

In addition, by locating the drive shaft at the rear upper part, it is close to the scum ejection device, so it is not necessary to use separate drive devices to drive the endless chain and the scum ejection device, as in the past, or to drive the scum ejection device. Since the same drive device can drive the endless chain and the scum ejector without using an inefficient manual ejector, power installation and operating costs can be greatly reduced. At the same time, it is possible to use a rotary, efficient, and easy-to-handle scum discharge device.

Furthermore, since the drive shaft is located at the rear upper part, a tension adjustment device for adjusting the tension of the endless chain can be installed at the front upper part, so that this adjustment can be done even when driving in the presence of water. This can be easily carried out, the apparatus can be operated continuously, and the capacity of the sedimentation tank can be greatly improved.

In addition, the drive shaft is driven by a transmission sprocket placed within the wall thickness of the notch step in the side wall, so the chain hooked on the transmission sprocket is housed within the wall thickness of the side wall. The width of the sedimentation pond can be made as long as the width of the sedimentation pond, so no scum is left behind (the generation of bad odors due to scum can be significantly reduced), and corbels can be installed on both sides of the bottom of the pond. It has many excellent effects such as eliminating the problem.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a settling tank equipped with a conventional sludge scraper, Fig. 2 is a front sectional view of the drive mechanism, and Figs. 3 to 5 are an embodiment of the present invention. Fig. 3 is a side sectional view showing an outline of the state in which the sludge scraper is installed in the sedimentation basin, Fig. 4 is an enlarged side sectional view along line E in Fig. 3, and Fig. 5 is It is an enlarged view showing a side cross section of the scum pumping device. 1... Endless chain, 2... Scraping board,
3, 5, 6... Driven shaft, 4... Drive shaft, γ, 9, 10... Driven sprocket, 8...
...゜゜Drive sprocket, 11... Drive device, 12... Guide rail, 13... Bearing, 14... Side wall, 15...・Transmission sprocket, 16...Chain, 1γ...
Haunch, 18... Intermediate conduction device, 19...
...Notch step, 20... Frame, 21...
・Tension adjustment device, 22...Bearing, 23...
...Screw rod, 24...Lever, 25...
・Guide, 26... Scum discharge device, 2T...
...Chain, 28...Hollow shaft, 29...
...Inflow port, 30...Discharge pipe, 31...
...flange, 32...pumping member, 33...
...Conduction sprocket, 34...Bottom, 35
...Sedimentation sludge basin, A...Sedimentation pond.

Claims (1)

[Scope of Claims] 1. In a sludge scraper that circulates and drives an endless chain provided with a sludge scraper, one drive shaft thereof is disposed on the scum scraping side at the rear upper part of the settling tank, and the upper part of the endless chain A sludge scraping machine characterized by being driven so as to forcibly pull a horizontal portion toward a drive shaft. 2. The sludge scraper according to claim 1, characterized in that the transmission sprocket attached to the drive shaft of the endless chain is located within the notch step of the side wall of the settling tank. 3. Sludge scraping device 4 according to claim 1, characterized in that the driven shaft of the endless chain disposed at the front upper part of the sedimentation tank is movable by a tension adjustment device of the endless chain. The sludge scraper according to claim 1, wherein a scum discharge device provided at a rear position of one drive shaft of the endless chain is driven by the drive device of the drive shaft.