JPS59156406A - Operation of sludge scraping machine - Google Patents

Abstract

PURPOSE:To economically enhance scraping capacity, by a method wherein the amount of a precipitate scraped by a scraper is detected when reaches a reference scraping amount and the next time scraping is started from the detected position. CONSTITUTION:An underwater truck starts scraping running from a start end FS being an initial reference position and reaches a final end FE while a precipitate is scraped by a scraper. When the amount of the precipitate scraped by the scraper reaches a reference scraping amount, a high load detecting switch acts and the truck reversely runs to a reverse running position X1 corresponding to a high load generating signal after the truck reaches the final end FE. The truck again enters a scraping state and begins to move toward the final end FE and the similar operation is repeated hereinafter to complete the scraping of the precipitate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of operating an underwater reciprocating traction type sludge scraper installed in a water treatment facility or the like.

The one shown in Fig. 1 is known as an underwater reciprocating traction type sludge scraper. To give an overview of this well-known sludge scraper, an underwater trolley 9 equipped with wheels 9a is arranged at the bottom of a settling tank 1 of a water treatment facility, etc.; A scraper 9b for scraping up sediment (sludge) 2 deposited on the scraping surface F is attached.

A towing device 7 is installed at one end of the sedimentation tank 1 for towing the underwater cart 9 along the bottom of the sedimentation tank 1 via a rope 8 wound around a plurality of sheeps 8a. This traction device 7 is driven by a prime mover 4 via a drive shaft 5 and a secondary reduction gear 6. Further, at the end of the sedimentation tank 1, there is a contact detector 10-a that detects when the running underwater cart 9 comes into contact with the submersible cart 9, and a traction device 7 that detects the contact between the underwater cart 9 and the motor 4.
A controller 10 is installed that outputs a control signal for stopping or reversing the underwater vehicle 9 (reversing the traveling direction of the underwater vehicle 9 compared to before contact detection).

As shown in FIG.
Travel the distance to E in T time to scrape up the sediment 2, open the discharge valve 3 for TD time to discharge the sediment 2 out of the tank, and continue for time T.

After the lapse of time, the operation is repeated to return to the starting point Fs.

In order to improve the scraping ability in such an operation system, it is sufficient to increase the operating speed of the underwater cart 9, but inside the sedimentation tank 1, if the speed of the scraper 9b becomes excessive, the sediment 2 will fly up and impair the function of the settling tank 1.

Therefore, there is a limit to increasing the operating speed of the underwater trolley 9, and efficient scraping of the sediment 2 cannot be expected.

The present invention is different from the conventional method in which the underwater cart 9 is always reciprocated from the starting end FB of the raking surface F to the terminal end FE regardless of the amount of deposited sediment 2. Focusing on the fact that the proportion of low-load running time increases during scraping movement, when the amount of sediment scraped up by the scraper reaches the preset standard scraping amount of the underwater trolley, the position is determined. The next raking is started from the previous detector R, which eliminates the above-mentioned conventional interpolation point, and the raking capacity is improved by economical operation according to the state of sediment accumulation. It is an object of the present invention to provide a method of operating a sludge scraper that can improve the performance of the sludge scraper. Below is the drawing of the present invention? This will be explained in detail with reference to the following.

Figures 3 and 4 show a submersible reciprocating traction type sludge scraper that implements the operating method of the present invention, and have the same parts as the conventional underwater reciprocating type sludge scraper shown in Figure 1. It is marked with the reference numeral. In this sludge scraper, a traction device operation amount detector 7 is connected to the traction device 7 via a coupler 7a.
b is attached. The traction device 7 is configured to be driven by the prime mover 4 via a secondary sprocket 11, a drive chain 12, a secondary sprocket 13, and a secondary reduction gear 6, and the drive chain 12 is provided with a high load detection switch 15. is being imposed.

Further, the traction device operating amount detector 7b and a pair of controllers 1
0, the operating amount signal 1 issued from the operating amount detector 7b
6 and a position determining device 18 that determines the position of the underwater vehicle 9 upon receiving a pond end arrival signal 17 issued from the controller 10. Furthermore, the high load detection switch 15 and the position determiner 18 receive a high load generation signal 19 issued from the high load detection switch 15 and a position signal 20 issued from the position determiner 18, and then the A reverse feed amount determiner 22 that emits an amount signal 21 is connected, and this reverse feed amount determiner 2
2, an operation in which the prime mover 4 is controlled based on the content of the reverse feed amount signal 21 outputted from the reverse feed amount determiner 22, and the submersible trolley 9 that has completed the raking run is run backwards to a predetermined position. Controller 14 is in communication.

An example of the high load detection switch 15 is shown in FIG. This high load detection switch 15 urges a shaft 25 equipped with a roller 23 and a contact plate 24 with a spring 26a in a cover 26 to press the roller 23 against the drive chain 12, and also moves the contact plate 24. When the tension of the drive chain 12 increases due to a high load and the shaft 25 moves to the right in FIG. 5 against the elasticity of the spring 26a, A limit switch 27 is pressed by the contact plate 24 to detect a high load.

FIG. 6 is an explanatory diagram of an operating method according to the present invention using the above-mentioned sludge scraper. In this figure, the underwater cart first starts scraping travel as shown in FIG. and reaches the terminal FE. The position of the underwater vehicle 9 while traveling is determined by the position 16 determiner 18 receiving the operation amount signal 16 output from the traction device operation amount detector 7b,
The starting point Fs is determined as a zero point.

During the raking movement of the underwater cart 9, as shown in Fig. 7 (
As in b), when the amount of sediment 2a scraped by the scraper 9b reaches the standard scraping amount of the underwater cart 9,
Correspondingly, the tension in the drive chain 12 increases, and the high load detection switch 15 (limit switch) acts to issue the high load generation signal 19 as described above. Reverse travel amount determiner 22
receives the position signal 20 emitted from the position determiner 18 and the high load generation signal 19, and determines the distance that the underwater cart 9 should travel in reverse after completing the raking operation (the high load generation signal 19 is output from the start end FE). distance to the detected position X1) el
The reverse running amount signal 21 is issued. Note that even after the amount of sediment 2a scraped by the scraper 9b reaches the standard scraping amount, the submersible cart 9 continues the scraping movement. ), the current overflows backward and is left behind on the raking surface F.

When the underwater trolley 9 moves through the scraping point F as described above and reaches the terminal end FE, as is well known, the controller 10 on the terminal end FE side operates to cause the underwater trolley 9 to run backwards toward the starting end Fs. . In this case, it goes without saying that the scraper 9b is floated above the scraping surface F.

Under the control of the operation controller 14, the underwater trolley 9 converts the distance e determined by the reverse travel determination device 22 into t.

It moves in time and returns to the detection position X1. Note that the return of the underwater cart in this case does not have to be exact.

Underwater trolley 9 returned to detection position Xl (or near this)
continues to move toward the terminal end FE, and scrapes up the precipitate left behind on the scraping surface F.

After that, perform the same operation to complete collecting the sediment on the falling part, and then return the underwater Taito to the starting point Fs of the seed collecting surface F to collect the sediment. resume. Thus, in FIG. 6, X2 is the second detection position which is a distance e2 from the terminal end FE. Also, at t2, the underwater cart is at the detection position fiX from the terminal FE.
This is the time required to return to step 2.

As is clear from FIG. 6, the time required for scraping according to the present invention is 2 (T+t, +t2+3・T, 1 hour), and a simple comparison with the corresponding conventional method shown in FIG. 2 shows that the conventional method The required time is 6 (T+TI) hours @
(See Figure @2), so in the end, 2(2T-chi-%”
) time has been shortened.

Note that the structure, type, and mounting position of the high load detection switch 15 are not limited to those shown in the drawings, but may be arbitrary, and the sensitivity and the like are usually determined by taking into account the equal specific gravity of the sediment. Also,
In addition to the method of determining the running armor of the underwater vehicle (method of determining the detection position) from the amount of rotation of the traction device, there is also a method of determining from the speed of the lobe and the elapsed time, for example. be.

As explained above, in the present invention, when the crushing of the sediment scraped by the scraper reaches a preset standard scraping amount of the underwater cart during the pushing movement, the position is detected, Since the next raking operation starts from the above-mentioned previous detection position, it is possible to minimize the low-load running of the underwater cart and achieve economical operation according to the state of sediment accumulation.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional submersible column traction type sludge scraper, Figure 2 is an explanatory diagram of the operating method of a conventional sludge scraper, and Figure 3 is a submersible reciprocating traction type that implements the present invention. A side view of the sludge scraper, FIG. 4 is a circuit diagram of the control system, FIG. 5 is a side view showing an example of a high load detection switch, FIG. 6 is an explanatory diagram of the operating method of the present invention, and FIG. (A), (B), and (C) are side views showing the relationship between the screen drain and the sludge. 1... Sedimentation tank, 2... Sediment (sludge), 7
...Traction device, 9...Underwater trolley, 9b...
...Skretsk, F...Scraping surface, F8...
...Start end, FE...End, Xl...Detection position.

Claims (1)

[Claims] In a sludge scraper that uses a scraper to scrape up sludge that has settled into a settling tank by moving an underwater trolley back and forth using a towing device, the view of the sludge being scraped up by the scraper on the underwater trolley can be seen during the scraping process when the underwater trolley is set in advance. When the standard raking amount has been reached, the entire position is detected, the submersible cart is moved to the end of the raking surface, and then the submersible cart is returned to the above detection position to scrape the sludge from the middle of the raking surface. A method of operating a sludge scraping machine characterized by repeating a series of repeated rounds to complete scraping of the remaining portion of sludge, and then returning the submersible cart to the starting end of the scraping surface to resume scraping of sludge. .