JPS6216166Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a method for scraping sludge deposited on the bottom surface of a settling tank in a water supply or industrial water treatment plant toward a hopper at the bottom end of the pond, and discharging the sludge from there to the outside of the pond. The present invention relates to a sludge raking device, and particularly to a submerged sludge raking device that rakes up deposited sludge by connecting a truck with a sludge raking plate to a traction rope underwater and moving it back and forth on the pond bottom.

The prior art of this type of sludge scraping device dates back to the 1970s.
44620, Utility Model Publication No. 56-16167, Utility Model Publication No. 56-24495, etc., when the cart moves forward, the sludge scraping plate is rotated and lowered using a mechanism that utilizes the traction force of the traction rope, and the sludge scraping plate is rotated and lowered. Sometimes the raking board is turned horizontally and raised to evacuate it from the pond bottom. In order to ensure that the raking device operates as described above, it is necessary that the running resistance of the cart is always greater than the turning resistance of the raking plate. If this relationship is reversed, the cart may move forward without the scraping plate rising sufficiently. For this reason, conventional sludge scraping devices either increase the weight of the trolley to increase the running resistance of the trolley, or incorporate a raking plate turning mechanism with a complicated structure to increase the turning force of the raking plate. However, all of these methods lead to increased costs and
Furthermore, since the traction force of the traction rope is applied directly to the elongated lever of the raking plate turning mechanism, a force pushing up the bogie is generated and there is a risk of the wheels coming off. Particularly when the sedimentation tank processes highly turbid water, the amount of sludge increases and the turning resistance of the scraping plate increases, so it is important to maintain the above-mentioned resistance relationship.

The present invention provides a solution to these problems of the prior art devices by minimizing the rolling resistance of the scraper plate at all times. The underwater tow type sludge scraper of the present invention is characterized by the provision of a pair of reversible disks around which a towing rope is wound on a rotating shaft that is supported by a carriage and swings the sludge scraper plate, and by the attachment of a balance weight to align the center of gravity of the swinging part with the center of the rotation shaft.

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 is a side view showing the operating state of the sludge scraping device of the present invention, and FIGS. 2 and 3 are enlarged side views showing the state of the cart having the scraping plate during forward sludge scraping and backward movement, respectively. , FIG. 4 is an enlarged side view showing details of the structure of the truck having the scraping plate, and FIG. 5 is a perspective view showing the drive system of the device. In Figure 1, at the front end of the bottom of settling tank 1, there is a mud collecting potper 2.
A tank is installed to receive the scraped sludge and discharge it outside the pond. There are 3 sloped boards in the pond.
A sedimentation accelerator consisting of the following equipment is installed to increase sedimentation efficiency and reduce the installation area. Below the inclined plate, a pair of rails 4 are installed on both sides of the sedimentation tank, and a truck 5 is mounted on the rails using its wheels 6 so as to be able to run on the rails in the front and rear directions. Towing ropes 8a and 8b led from the drive device 7 are connected to the truck 5 from the front and rear as described below, and the truck 5 is pulled by these ropes and moves forward in the direction of arrow A and retreats in the opposite direction of arrow B.
FIG. 5 shows an example of such wiring.

Figures 2 to 5 show details of the structure of the truck portion of the present invention. A rotating shaft 9 is horizontally supported on the trolley 5 so as to be able to swing and rotate freely, and the rotating shaft 9 is provided with a pair of reversing discs 10, 10 on both sides, and a pulling rope 8a from the front is attached to the reversing disc 10 The tow rope 8b from the rear is wound clockwise from the top and fixed at the tip, and the tow rope 8b from the rear is wound counterclockwise from the top and fixed at the tip. A sludge scraping board 11 is attached to a pair of reversing discs 10, 10,
When the reversing disk 10 is pulled by the towing rope 8a and swings counterclockwise, the scraping plate attached to it hits the stopper 12 and assumes a vertical position as shown in FIG. 2, and the towing rope 8a is pulled. When the sludge S is scraped up in the direction of the arrow A, and on the contrary, the reversing disk 10 is pulled by the pulling rope 8b and swings clockwise, the scraping plate 11 moves to the stopper 13 as shown in FIG. When this occurs, the vehicle takes a retreating position and moves backward by being pulled by the towing rope 8b. A balance weight 14 shown in dotted lines in FIGS. 2 and 3 is attached to the swinging part consisting of the rotating shaft 9, the reversing disk 10, the scraping plate 11, etc., so that the center of gravity of the swinging part is aligned with the rotating shaft. It is made to coincide with the center of 9. The balance weight 14 may be adjustable and attached separately from the reversing disk 10, or may be integrally formed as shown in FIG. By doing this, the gravitational moment of the swinging portion is reduced to the rotating shaft 9.
This eliminates the influence of the fluctuation of the gravitational moment due to the angular position of the scraping plate in the conventional structure, and the scraping plate 1
The turning resistance of No. 1 is always the minimum.

As shown in FIG. 4, wheel scrapers 15 are attached to the truck 5 before and after the running wheels 6, so that the running resistance of the truck 5 is kept constant without being increased by the accumulated sludge. This resistance must always be maintained larger than the rolling resistance of the scraping plate, but since the latter resistance is the minimum as described above, there is no need to make it extra large. Fig. 5 shows a set of two trolleys 5, 5 arranged so that if one is moving forward, the other is moving backwards.
This makes it possible to save on towing ropes. Tow ropes 8a and 8b are wound from the winding drum 16 connected to the drive device 7 to the guide pulley 17 and connected to the truck as described above, and the tow ropes 8a and 8b only pass through the connecting thimble 18 and turnbuckle 19. is connected to the trolley.

The forward raking operation and the backward moving operation of the truck 5 can be automatically and repeatedly operated by limit switches (not shown) at the raking end and the backward moving end installed in the sedimentation tank. In addition, by manual selection, it is possible to intensively collect the inlet side of the sedimentation tank where a large amount of sludge is deposited.

As described above, according to the present invention, the turning resistance of the scraping plate is minimized, and the running resistance of the trolley is not increased.
In addition, without creating a complicated scraping plate rotation mechanism, it is possible to maintain a predetermined relationship between both resistances and operate smoothly, so that the traction force is less attenuated by the running resistance of the trolley and is effective in scraping up the deposited sludge. be able to.

Therefore, according to the present invention, it is possible to obtain a submersible towed sludge scraping device of this kind, which has a relatively simple structure, can be manufactured at low cost, has excellent functionality, is stable, and has a low chance of failure, and is capable of handling high turbidity. It has the effect that it can be advantageously applied even in the case of boiling water.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the operating state of the sludge scraping device of the present invention, Fig. 2 is an enlarged side view showing the state of the trolley having the scraping plate when moving forward to collect sludge, and Fig. 3 is when moving backward. FIG. 4 is an enlarged side view showing details of the structure of the cart having the scraping board, and FIG. 5 is a perspective view showing the drive system of the device. 1... Sedimentation tank, 2... Sludge collection hopper, 3... Inclined plate,
4... Rail, 5... Dolly, 6... Wheel, 7... Drive device, 8a, 8b... Traction rope, 9... Rotating shaft, 10
... Reversing disk, 11... Sludge scraping board, 12, 13... Stopper, 14... Balance weight, 15... Wheel scraper, 16... Winding drum, 17... Guide pulley, 18... Connection thimble, 19... Turnbuckle, A , B...Directional arrow, S...Settled sludge.

Claims (1)

[Scope of utility model registration request] This sludge scraping device is a sludge scraping device in which a sludge scraping plate is swingably attached to a trolley that moves back and forth while being towed on the bottom of the settling tank, and uses the traction force to lower the sludge scraping plate when the trolley moves forward and raise it when it moves backwards. At the same time, a pair of reversing disks are provided on which a traction rope is wound around a rotating shaft that is supported by the truck and swings the sludge scraping plate.
An underwater towed sludge scraping device characterized by being equipped with a balance weight that positions the center of gravity of the swinging part on the rotation axis.