JPH01231912A - Scum scraping-up device in precipitate scraping-up unit - Google Patents

Abstract

PURPOSE:To selectively carry out the precipitate scraping-up or the scam scraping-up by installing a backet conveyer to a vertically movable guide frame so as to be stretched along the bottom of a pool and providing scam collecting plates in the periphery of the guide frame. CONSTITUTION:The backet conveyer 2 provided with a number of backets B in a certain pitch to an endless chain is installed to the vertically movable frame so as to be stretched along the bottom of the pool. The scum collecting plates g are provided in the periphery of the guide frame 3 so as to be allowed to scrape up selectively the precipitate or the scum. Consequently, the scum is allowed to be scraped up with the same device as the precipitate scraping-up unit without providing other scum removing device.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a scum collection plate around the raking guide frame of a raking machine that rakes up sand and other sediment in a sedimentation basin, etc., to float it on the water surface. The present invention relates to a scum scraping device in a sediment scraper, which is capable of scraping up scum in the same machine.

[Conventional technology]

In a settling basin of a sewage treatment plant or the like, a settling machine is used as a means for scraping up sludge and other sediments that settle at the bottom of the settling basin. For example, Utility Model No. 61-19764, No. 61-
There is one disclosed in Japanese Patent No. 19765.

This sand raking machine is equipped with a sprocket wheel at the end of the front moat of a raking guide frame arranged along the bottom of the sand basin.
An endless bucket conveyor is stretched between this wheel and a sprocket wheel placed on the ground, and by driving the bucket conveyor, the buckets move along the pond bottom and remove sediment such as sand. The waste is collected and placed in a bucket to be discharged into an oily tank.

In addition, in order to prevent the bucket conveyor from being buried by inflowing earth and sand when the bucket conveyor is not in use, there is a system in which the guide frame for displaying the bucket conveyor is of an elevating type.

[Problem to be solved by the invention]

The sediment can be scraped up and discharged by driving a bucket conveyor placed along the bottom of the pond. Since it is used only for lifting up sediment, it is not used for removing scum floating on the water surface, and a separate scum removal device is provided for this scum removal.

In the present invention, by providing a scum collection plate around the guide frame of the elevator bucket conveyor, it is possible to scrape up both sediment and scum floating on the water surface with the bucket conveyor.

[Means for solving the problem] A sediment scraper in which a bucket conveyor, in which a large number of buckets are attached at a constant pitch to an endless chain, is stretched over a guide frame that is arranged in an ascending and descending manner along the bottom of the pond. In this method, a scum collection plate is provided around the guide frame so that sediment scraping and scum scraping can be selectively carried out. Furthermore, when scraping the scum, the sediment is scraped.
'M machine is linked with water level detection means to scrape up scum on the water surface.

[Effect]

By installing a scum collection plate around the #i drawing guide frame on which the bucket conveyor is stretched, and which is placed on the bottom of the pond, the lifting function of this guide frame and the t! When used in combination with the above functions, it is possible to selectively, efficiently, and cost-effectively scrape and remove sediment and scrape and remove scum floating on the water surface without providing a separate scum removal device.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

In the figure, l is a settling tank installed in a sewage treatment plant, etc. A bucket conveyor 2 for sand removal consisting of a large number of buckets B attached at a constant pitch to an endless chain is stretched in this settling tank l. The bucket conveyor 2 has sprocket wheels 3a, 3b, 5a installed on a guide frame 3 for raking, which rests on the bottom of the sand settling basin and has a required length in the front direction of the sand settling basin, and on a pedestal 4 on the ground. 5b...
Engage between 5c. The guide frame 3 is provided with submersible sprocket wheels 3a, 3b at its front and rear ends, and the pedestal 4 is provided with guide sprocket wheels 5a, 5b, 5c, a driving sprocket wheel 5d, and a take-up wheel 5e, and a bucket conveyor is installed between the second wheels. 2 is strung up. 6 is a drive machine, a drive sprocket wheel 5d
is driving.

Further, the guide frame 3 is supported by a lifting device 7 provided on the pedestal 4 in a suspended manner via cables 8 so as to be able to rise and fall freely, and thereby the guide frame 3 is of a lifting type. A scum collection plate 9 is detachably attached to the periphery of the guide frame 3 via a bracket 1° to enable scum scraping.

This scum collection plate 9 is attached to the guide frame 3 without interfering with the movement locus of the bammut B driven by the bucket conveyor 2, keeping a minimum distance from the locus.

In this case, the scum collection plate 9 surrounds the guide frame 3, and the lower end of the scum collection plate 9 is positioned at the same level or slightly lower than the lower end of the bucket supported by the guide frame, and the upper end is positioned at the upper end of the guide frame. The scum is placed in a higher position and has a shape in which the upper part gradually expands with respect to the lower part. The outer shape and size of the lower part of the collection board, as well as the distance between the inner surface of the pond and the outer surface of the scum collection board, are determined to be optimal depending on the terrain.

As shown in FIG. 4, the bracket 10 protruding from the inside of the scum collection plate 9 is fixed at its tip to the guide frame 3 or is movable vertically relative to the guide frame 3. Make sure that both pieces are locked. That is, the scum collection plate is slidable in the vertical direction between the upper and lower parts of the guide frame and is locked to the guide frame.

Next, the operation will be explained.

Note that since there is no difference in lifting up the sediment from the conventional method, a description of its operation will be omitted, and scum scraping will be explained.

When the guide frame 3 is positioned above the water surface of the settling basin at a predetermined upper limit of 11 positions ra (see Figure 4 (1) and Figure 5 (1)), in order to scrape up the scum, the lifting device 7 is driven. Then, the guide frame 3 is lowered from the upper limit standby position.

Then, in response to a signal from the water level detection means, the lifting device 7 is stopped at a predetermined position where the upper end of the scum collection plate 9 provided on the guide frame is above the water surface, that is, the position where the scum collection plate is completely submerged in water, and the lowering of the guide frame 3 is stopped. (Figure 4 (
2) See Figure 5 (2)). Then, the scum collecting plate 9, which has been submerged in water, is raised using a timer or the like to the point at which the scum scraping operation starts (FIG. 4 (3), FIG. 5 (3)).

At that time, that is, when the scum collection plate 9 moves upward with the guide frame 3, the scum on the water surface above the scum collection plate flows over the upper edge of the scum collection plate along the water flow and into the scum collection plate. flows into. However, once the scum has flowed into the scum collection plate, the scum is dammed by the scum collection plate and is prevented from flowing out of the plate.

At this time, when the bucket conveyor 2 is operated, i
The scum that is floating and is dammed up in the scum collection board is 1
・It is scraped together in the primary bucket, scooped up, and discharged. Therefore, the scum can be scraped up efficiently.

When the scum has been scraped up by operating the Hackett conveyor for a predetermined period of time, the bucket conveyor is stopped, or the scum collection plate is raised again to the upper limit standby position while the bucket conveyor is running, and the scum collection plate is raised to the upper limit standby position. Finish the pumping operation. At this time, the bucket conveyor is also stopped.

Further, in the embodiment shown in FIGS. 6 and 7, the scum collection plate 9 is individually raised and lowered relative to the guide frame.

This scum collection plate 9 has a size and shape that allows the guide frame to be inserted so as to surround the periphery of the bucket conveyor along the guide frame, and the size is not predetermined according to the shape and size of the settling basin. The same as the previous embodiment, but the difference is that the scum collection plate 9 in the actual Bv, example
The lower part has a flared trumpet shape, and the upper part is a vertical frame. This scum collection board 9 is attached to the mount 4
Scum collection 1 volume M11 to rope 12 arranged on top
It is supported in a suspended manner so that it can be lowered up to 4 times, and when not scraping up scum, it is stopped at the upper limit standby position above the water surface, as shown in FIG. 7 (1) and FIG. 6. To scrape up the scum, the scum collection plate 9 is lowered from this upper limit standby position by unwinding the cable 12, and stopped when it reaches a predetermined lowering position by the water level detection means as shown in FIG. 7 (2). . At this time, the lower trumpet-shaped part of the scum collection plate 9 is submerged in the water surface, and the scum floating on the water surface is flowed into the scum collection plate and buried, as in the first embodiment, and flows out into the root ball. Try not to. At this time, the upper part of the scum collection plate protrudes above the water surface. Next, as shown in Fig. 7 (3), the guide frame 3 is lowered from the upper limit standby position, inserted into the scum collection plate that has stopped lowering, and is floated on the water surface by operating the bucket conveyor. This method efficiently scrapes up scum in sequence.

Incidentally, in the first and second embodiments, the sediment on the pond bottom and the scum on the water surface are selectively scraped up by the same Bamut conveyor, but the scraped up scum and sediment are In order to separate and discharge, the scraping machine requires 11i! A transport means 12 is provided. This separating and conveying means is shown in Figs.
There is the one shown in the figure or the one shown in FIG.

The embodiment shown in FIG. 8 is equipped with a damper 14 on the chute 13 that receives the scraped material discharged from the bucket conveyor, and a scum conveyor 15 and a sediment conveyor 16 are provided at the lower part of the damper 14 and at the lower end of the chute. By opening and closing this damper, the scum and sediment scraped up by the same bucket conveyor are separated and carried out.

Furthermore, in the one shown in FIG. 9, the unloader 17 disposed at the bottom of the chute 14 is provided with two different discharge ports 17a and 17b. Scum and precipitate are separated by switching between 7a and 17b.

Also, what is shown in Figure 10 is Export B! When a flight conveyor is used for 118, while supplying water into the trough 19, the flight 20 on the return side scrapes the scum floating on the water surface and causes it to overflow, thereby discharging the scum and sediment by λ111. It is something.

〔Effect of the invention〕

Since the present invention has the configuration as described above, it produces the effects described below.

In the scum scraping device in the sedimentation↑rapping machine according to claim 1, the scum that causes odor is removed without sedimentation.
! Scum can be scraped up using the same device as the drawing machine without providing a separate scum removal device.

Claim 2 Kigeki no Precipitate i! At the beach, the scum collection board is linked to the water level detection means and stops moving up and down, so there is no scum! To make drawing removal economical and effective.

[Brief explanation of the drawing]

Figures 1 to 5 show the first embodiment; Figure 1 is a front view, Figure 2 is a side view, Figure 3 is a plan view, and Figures 4 and 5 are explanations of the operation of the scum collection plate. Figure 4 shows its side view.
FIG. 5 shows a front view of the same. 6 and 7 show the second embodiment, FIG. 6 is a side view,
FIG. 7 is an explanatory diagram of the operation of the scum collection plate. FIG. 8, FIG. 9, and FIG. 10 are explanatory diagrams showing means for separating scum and precipitate. 1 is a settling basin, 2 is a bucket conveyor, 3 is a guide frame, 4 is a pedestal, 7 is a lifting device, 9 is a scum collection Figure 4 Figure 9 IXJ (Q) (b) (C) Figure 10 Bell -

Claims (2)

[Claims] (1) In a sediment scraper in which a bucket conveyor in which a large number of buckets are attached to an endless chain at a constant pitch is stretched over a guide frame that is arranged in an upward and downward manner along the pond bottom, the guide frame is A scum scraping device for a sediment scraper, characterized in that a scum collecting plate is provided around the periphery so that sediment scraping and scum scraping can be selectively performed. (2) In a sediment scraper in which a bucket conveyor, in which a large number of buckets are attached at a constant pitch to an endless chain, is stretched over a guide frame that is arranged in an upward and downward manner along the pond bottom, the guide frame is A scum scraper in a sediment scraper characterized in that a scum collecting plate is provided around the periphery, and when scraping the scum, the sediment scraper is linked with a water level detection means to scrape up scum on the water surface. Lifting device.