JPS6034323Y2 - Reversing mechanism in underwater sludge scraper - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an inversion mechanism in an underwater sludge scraper installed in a settling tank for water treatment operations.

In recent years, it has become difficult to secure a place to install sedimentation tanks, which require a large installation area, so inclined plate type sedimentation tanks, which require a small installation area, have been increasingly adopted.

A sludge scraper is installed in an inclined plate type settling tank, one of which is a link belt type scraper.

This link belt type scraping board is structurally expensive.

Therefore, an underwater sludge scraper is adopted, but the conventional underwater sludge scraper has drawbacks such as the complicated scraper part and not smooth operation.

Figure 1 shows an example of a conventional underwater sludge scraper.

As can be seen from the figure, in this example, the scraper 1 is driven by a drive means for advancing and retracting the vehicle via a wire 104 for advancing and retracting the vehicle.
A complex link mechanism consisting of a large number of links 102 is used so that the scraping plate 101 of No. 00 maintains an upright posture without rotating in the backward direction (inversion side) of the truck when the truck moves forward.

In such a complex linkage, part 1 of the pin hinge
03 In other words, the amount of emotion increases and the frictional resistance increases accordingly, so if the wire tension is less than the wire tension required for moving the cart,
1 cannot be rotated in reverse.

In addition, since the raking plate is used underwater, in order to rotate the raking plate smoothly, it is necessary to use an oilless bush (oil-impregnated bearing) or the like on the pin hinge portion 103 to reduce the labor of oiling as much as possible. There is.

Therefore, the more rotation bearing parts a scraper has, the more
This is disadvantageous in terms of maintenance, cost, etc.

In addition, the raking capacity of the raking machine was lower than that of the link belt raking machine.

This idea was devised to solve the above-mentioned conventional problems, and it is an underwater sludge scraper with an extremely simple structure that allows the scraping plate to be easily reversed and is easy to manufacture and maintain. The purpose is to provide.

The main feature of this invention is that the buoyancy and counterweight of the raking board are made of lightweight wood or wood, which simplifies the structure and facilitates the reversal of the raking board. In addition, the sludge scraping ability is improved by providing at least two sets of scrapers in the forward and backward directions of the scraper.

This invention will be explained below with reference to illustrated embodiments.

FIG. 2 is a longitudinal sectional view showing the configuration of the settling tank 1 and the underwater sludge scraper 2 according to this invention.

A hopper 3 for collecting collected sludge is provided at the bottom of one end of the sedimentation tank 1, and a scraper 2 moves forward and backward toward the hopper 3.

As shown in FIG. 3, the underwater sludge scraper 2 of this invention includes a trolley 6 that moves back and forth on rails 5 laid on the bottom surface 4 in the opposite direction to the hopper 3, and at least two sets of trolleys 6. It consists of a provided scraper 7.7' and drive means 14 for actuating the scraper 7.7' and the carriage 6 (see FIG. 2).

Since the scrapers 7 and 7' have the same configuration, the scraper 7 is mounted on the left and right sides of the truck 6 so as to be rotatable (or tiltable) in the direction of advancing and retracting the truck, and in the direction of longitudinal force. A pair of left and right arms 8.8 whose substantially central portions are pivoted, a lightweight wooden or synthetic resin scraping board 9 disposed between the lower portions of the arms 8, 8;
It is composed of a scraping plate 9 and a counterweight 10 that rotates together.

When the scraper plate 9 is upright, the center of gravity of the counterweight 10 is located on an extended line C passing through the center A and tilted by a small angle θ0 in the direction of carriage movement from a vertical line B passing through the center A of the shaft support 13 of the arm 8. It is set up like this.

At least two sets of scrapers 7 having such a configuration
．． 1' are provided on the carriage 6 at appropriate intervals in the direction of movement.

The upper portions of the arms 8, 8' are interlockably connected by a connecting part 11 (or wire), and the bar 11 and the tow cable (hereinafter referred to as wire 12).

) is connected to a drive means 14 for moving the cart forward and backward.

Next, the operating state of the scraper 2 will be explained.

When scraping sludge, move the scraper 2 to M in Figure 2.
The wire 12 is wound up by the driving means 14.

Then, the arm 8゜8' is pulled in the direction of carriage movement, and the scraping plate 9゜9' becomes upright, and the scraping plates 9, 9'
The sludge is collected by moving toward the hopper 3 by the cart 6.

At that time, the scraping plates 9, 9' have a counterweight of 10.10
(10' is not shown) is stable and does not vibrate due to changes in resistance received from the sludge, so raking is performed reliably.

In addition, since two sets of scrapers 7 and 7' are provided in the forward and backward direction of the trolley, even if the sludge overflows beyond the scraping plate 9 without being scraped up by the previous scraper 7, the scraper 7 and the subsequent scraper 7 ′, the raking ability can be improved.

Next, when the cart 6 reaches the N position of the hopper 3, the driving means 14 temporarily stops winding, and this time winds the wire 12 in the opposite direction.

Then, the wire 12 is pulled toward the M position, thereby causing the arms 8, 8' to reverse in the direction in which the truck moves backward.

Along with this reversal, the scraping plates 9, 9' are pulled up, but at this time, when the center of gravity of the counterweight 10 is aligned with the vertical line B, the scraping plates 9, 9' are pulled up by the counterweight 10 and 10' alone. Furthermore, since the raking plates 9° 9' are made of wood or lightweight synthetic resin, if the specific gravity is lighter than water, the counterweights 10, 10' will promote inversion.

Therefore, when the scraping plates 9, 9' are reversed, the tensile force of the wire 12 is not required at all, and the tensile force of the wire 12 serves mostly to drive the carriage 6.

Moreover, once the scraping plates 9, 9' are reversed, the center of gravity of the counterweight 10, 10' is stabilized in a state far away from the vertical line B.
There will be no inconveniences such as standing upright and raking sludge in the opposite direction.

In addition, in this invention, the pin hinge portions of the arms 8, 8' are only at two points, so the structure is simple;
It is superior to conventional scrapers in terms of ease of manufacture and maintenance.

Now, when the wire 12 is pulled in the opposite direction, the scraping plates 9, 9' are reversed as described above, and become parallel to the bottom surface of the sedimentation tank 1 or at an acute angle with the parallel line, and then the trolley 6
travels (backwards) toward position M, and when it reaches position M, the process described above is repeated again to scrape up the sludge that has settled in the settling basin.

As described above, according to this invention, the structure of the scraper has a single pin hinge, and the reversing mechanism of the scraper is made extremely simple by providing a counterweight and a scraping plate made of lightweight wood or synthetic resin. It is possible to provide an underwater sludge scraper which is easy to manufacture and maintain, and which can operate smoothly and reliably.

[Brief explanation of the drawings] Figure 1 is an elevational view 1 showing an example of a conventional underwater sludge scraper;
Figure 2 is a longitudinal sectional view showing the underwater sludge scraper of this invention installed in a settling tank, Figure 3 is an elevational view 1 showing details of the underwater sludge scraper, and Figure 4 is its plan view. be. 1...Sedimentation tank, 2...Underwater sludge scraper, 3...Hopper, 4...Bottom, 5...
...Rail, 6......stand IL 7,7'...
...Scraper, 8,8'...Arm, 9
．． 9'...Scraping board, 10...Counterweight, 11...Connection bar, 12...
・Wire, 13... Axis support, 14...
Drive means.

Claims (1)

[Scope of utility model registration request] A trolley capable of advancing and retracting along the bottom of a sedimentation tank having a sludge collection hopper at one end toward the hopper; In an underwater sludge scraping machine having a scraping plate, an arm is rotatably supported on the trolley at approximately the center in the longitudinal direction so as to be rotatable in the advancing and retracting direction of the trolley, and an arm that is perpendicular to the traveling direction of the trolley is attached to the lower part of the arm. A lightweight wooden or synthetic resin scraping plate is arranged, and when the scraping plate is upright, the arm spindle is tilted at a slight angle in the direction of carriage movement from a vertical line passing through the center of the arm spindle. Two or more sets of counterweights are cut into the arm support shafts so that the center of gravity is on an extension line passing through the center, spaced apart from each other in the direction of advancing and retracting the trolley, and the upper ends of the arms are connected to each other via a connecting bar. A reversing mechanism in an underwater sludge scraper, characterized in that the reversing mechanism is connected to a drive means for advancing and retracting the truck via a wire for advancing and retracting the truck.