JPH0475964B2 - - Google Patents

Description

Detailed Description of the Invention ``Field of Industrial Application'' The present invention is applicable to wastewater flowing through waterways such as agricultural canals, water supply and sewage drainage channels, and other intake channels, as well as garbage floating in seawater or floating on the water surface. In addition, the present invention relates to a dust removal device for waterways such as irrigation canals that can effectively capture settling debris such as sand, pebbles, wood chips, metals, etc. that are washed away from the bottom of the waterway.

``Prior Art'' There are various dust removal devices using this type of screen bar, and many technical documents can be found here and there.

For example, the device for removing dust in a waterway disclosed in Japanese Patent Publication No. 54-42742 has a structure in which a screen is swingably provided with respect to the waterway, and the purpose is to prevent an excessive increase in head loss and to automatically remove dust.

In addition, in the garbage processing equipment for waterways in Japanese Patent Publications No. 59-4005 and No. 59-38365, the screen is arranged so as to have the same directionality as the water flow, which prevents clogging of the screen and facilitates maintenance. It is in.

Furthermore, there is a dust remover disclosed in Utility Model Publication No. 47-19895, and this document discloses a screen bar having holes.

In addition, the garbage device for waterways in Utility Model Publication No. 57-43943 has a configuration consisting of a combination of a screen and a screen conveyor having rake pieces, and mainly captures large garbage with the screen and captures small garbage with the screen conveyor. The feature is that the dust caught on the screen is raked up using rake pieces.

Furthermore, in the dust removal device in Utility Model Publication No. 60-35626, rakes are installed according to the width of the screen.
The purpose is to make it removable and to be able to effectively deal with changes in the amount of inflow into the waterway.

In addition, there is a dust removal device for open channels disclosed in Japanese Patent Application Laid-Open No. 54-125840, the gist of which discloses the structure of a screen that is a combination of a bar screen having grooves and a rake having rake blades for scraping up the inside of the grooves. has been done.

``Problems to be Solved by the Invention'' In the various technical documents mentioned above, the screen bar has a V-shape or U-shape, and the screen bar itself has a structure that does not allow running water to pass through. ing.

Therefore, the head loss due to the reduction in the cross-sectional area of flowing water, which is the area where this screen bar is arranged, will increase, and the occurrence of clogging and overflow of flowing water will be avoided. It was unavoidable.

In addition, there was a risk that dust would be dropped (missed) due to insufficient upward movement of the flowing water against the groove surface of the screen bar, reflection of the flowing water, and insufficient self-cleaning effect due to upward flow.

Furthermore, in a configuration in which a rake rotating with an endless chain is slid onto this screen, as shown in FIG. 32
Very often, complex and/or superimposed vortices are generated at the bottom of the triangular shape formed by the top surface of the screen 31 that is in contact with the top surface of the screen 31.

Due to the generation of this vortex, the screen bar 3
The garbage caught in 1a may be pulled back and become disturbed, causing the garbage to be dropped or not being captured, or causing a large noise and causing inconvenience to people in the vicinity.
There were other problems.

Among the above technical documents, in the invention of JP-A No. 54-125840, the rake with rake blades does not have the same directionality as the flowing water of the waterway, so as mentioned above, the rake has a triangular rear surface. It is conceivable that eddy currents may be generated in the basin, and this invention is also conceivable to have the same problem as described above.

Furthermore, the above-mentioned Japanese Utility Model Publication No. 19895/1989 discloses a screen bar having holes.

However, creating holes in the entire screen bar poses problems in terms of commercialization, such as problems in terms of strength and the need for labor and cost in manufacturing the screen bar.

``Means for Solving the Problems'' In view of the above, the present invention effectively utilizes the upward flow in the grooves of the screen bar to trap dust, and then collects and deposits the dust in the upstream part of the screen bar, and the water flow Equipped with a rake that moves while maintaining the same direction as the screen bar, the screen bar with holes is equipped with a rake that moves while maintaining the same direction as the screen bar, in order to securely capture dust and reduce noise. The following configuration was adopted for the purpose of:

That is, the dust removal device for waterways such as irrigation canals of the present invention is a screen in which V-shaped, U-shaped, etc. screen bars with the groove surfaces facing upward are arranged in the waterway at appropriate intervals, a screen having a through hole for passing running water in a part thereof, and a part of the through hole is always located below the water surface of the waterway and in contact with the running water; and the inside of the groove of the screen bar; A rake having rake teeth inserted with a gap between the screen bars and a horizontal surface that slides into contact with the water flow while maintaining the same directionality as the water flow, and a drive that moves the rake. It consists of means and.

"Action" Next, the operation of the present invention will be explained.

As shown in the figure, a screen bar is installed in a waterway such as an irrigation canal with a gentle upward slope, and through holes for flowing water to pass through are provided above the water level and at the protruding portion of the water surface.

Therefore, since the through holes provided in the screen bar are located in the portion of the flowing water with the maximum flow velocity in the flow velocity distribution of the waterway, the flowing water portion with the maximum flow velocity can smoothly pass through the through holes. , the head loss that occurs in proportion to the square of the flow velocity becomes smaller, and the flow from the through holes located at the top of the screen bar reduces the lower part of the screen bar groove (hereinafter simply referred to as the groove). An upward flow of running water is also generated, and the dust, which was conventionally thrown away due to reflection of running water on the groove surface, is reliably captured by the screen bar.

The captured dust is then removed out of the waterway through the rising rake while maintaining the same directionality as the water flow.

Furthermore, even if dust accumulates on the upper part of the screen bar, the accumulated dust will not penetrate into the groove, so the through hole will not be blocked, and the flow from this through hole will flow into the groove surface. maintained along.

Therefore, garbage will not be missed due to reflection of running water on the groove surface.

In this way, the dust can be efficiently captured and collected above the screen, and in some cases, the dust can be naturally dried.

In addition, in a device equipped with a rake, along with the upward flow of the screen bar, the dust captured by the screen bar is forcibly raked up through the rake teeth, and during the raking process, the dust is forcibly raked up through the rake teeth. Then, it is stacked on the top surface of the flat plate part of the rake.

In this case, the rake maintains the same directionality as the water flow, and provides rake teeth with gaps in the grooves and in the gaps between the screen bars, and the water is captured by the screen bar through the rake teeth. Since the structure is designed to scrape up dust, the water resistance of the rake is extremely reduced, and there is no vortex generated between the rake and the bottom of the screen near the rake. The various disadvantages mentioned above can be further exacerbated.

Therefore, the dust captured by the screen bar will not be missed, and the generation of noise will be extremely reduced.

Furthermore, with this device, it is possible to automate the capture and removal of dust, and as mentioned above, it is highly expected that it will be possible to remove dust reliably and reduce noise.

``Embodiment'' An embodiment of the present invention will be specifically described below based on the drawings.

First, the dust removal device of the first invention, specifically the first
The screens in the examples shown in Figures to Figure 3 will be described in detail. 1 is a V-shaped, U-shaped, etc. screen bar, and the downstream side of this screen bar 1 (however, if the screen bar 1 is installed in the waterway 2) ) are provided with through holes 4 such as windows or slits for the passage of running water, and the number and length of these through holes 4 are set as appropriate.

The screen bar 1 configured in this manner is installed in the waterway 2 via the attachment bodies 5 and 6 with a gentle slope of 65 degrees or less (preferably around 20 degrees to 30 degrees), so that the screen A is configured. be done.

Also, as shown in Figures 4 and 5, it is adopted for the intake channel, and in this case, as shown in the figure, it is installed between the submerged weir 7 and the intake basin 8, and is arranged so that the downstream side is lowered. screen A is constructed.

Therefore, the through hole 4 is provided on the downstream side and in a lowered position, and the running water that overflows the submerged weir 7 is cleaned of dust by this screen A and becomes clean running water, and this running water is passed through the pipe. It flows out into waterway 9.

On the other hand, the dust is collected near the through holes 4 of the screen bar 1.

Next, to explain the dust removal device of the second invention in detail, in the examples shown in FIGS. 20° to 30°), a rake 10 that slides into contact with this screen A, and an endless chain 11 installed on the upstream side of the screen A that controls the transition of this rake 10. Moreover, the rakes 10 are provided at appropriate intervals on the endless chain 11 in a so-called substantially horizontal state so as to have the same directionality as the water flow.

Therefore, the flowing water resistance to the rake 10 is
It has a mechanism to hold it down as much as possible.

In the figure, 12 is a drive roller, 13 is a guide roller, and 14 is a dust collection trough.

In addition, in the examples shown in FIGS. 8 to 11, the fourth
A rotatable bucket device B is equipped on the screen A used for the intake channel shown in FIGS.

Therefore, to explain a preferable example of the bucket device B, a bottom rod 16 for a bucket that corresponds to the screen bar 1 constituting the screen A and is mounted in this groove 3, and a bottom rod 16 for the bucket that is framed by the bottom rod 16 for the bucket A frame rod 17, a mounting rod 18 having a weight 19 at the upper end for suspending the frame rod 17, and a mounting rod 18 rotatably supported, and the bucket bottom rod 16 is mounted on the screen bar 1. Alternatively, it is composed of a rotating means 20 installed on the water intake rod 8 to enable separation.

Then, when the mounting rod 18 is rotated rearward via the weight 19 at the point where the dust is caught on the screen bar 1 and the bucket bottom rod 16 supported on the screen bar 1, as shown in FIG. The dust collected by rotating in the opposite direction falls into a dust collection trough (not shown), etc.
Through this operation and procedure, the removal of garbage is completed.

Now that this elimination is complete, we will move on to mounting rod 1.
8 is rotated in the forward direction to return to the above-mentioned state, and the bottom rod 16 for the bucket is placed on the so-called groove surface 3 of the screen bar 1, and the dust trapping operation is started again.

This operation is repeated to remove dust from the running water.

Next, to explain the operation of the present invention, a through hole 4 for flowing water to pass is formed in a part of the groove 3 of the screen bar 1 which is arranged with a gentle slope in a waterway 2 such as an irrigation canal.

Therefore, the water flowing above the channel 2 where the flow velocity is high in the normal flow velocity distribution schematically shown in FIG. Moreover, due to the flow from the through hole 4 located at the top of the screen bar 1, an upward flow of the flowing water from the lower part to the upper part in the groove 3 is also generated. The spilled garbage is also captured by the screen bar 1.

The captured dust then rises to the downstream part of the screen bar 1, and is finally led to the vicinity of the water surface, so-called the upper surface of the water level, and the vicinity of the through holes 4 in the water surface protrusion. , are efficiently deposited in sequence near this through hole 4.

Also, even if dust accumulates above the water level,
Most of the dust is caught by the screen bar 1 in a wrap-around manner, and the accumulated dust does not penetrate into the groove 3, so the through hole 4 is not blocked.
The flow from the groove is maintained along the groove surface.

Therefore, garbage will not be missed due to reflection of running water on the groove surface.

On the other hand, the dust efficiently collected above the screen A as described above can be naturally dried when the water level drops.

In addition, in the waterway 2 cross section, at the top of the water flow cross section,
For safety, a sufficient amount of passage through the free boat section is also provided.

Further, in a device equipped with a rake 10, along with the upward flow of the screen bar 1, the dust captured by the screen bar 1 is transferred via the endless chain 11, and is transferred into the groove 3 of the screen bar 1 and into the screen bar 1. The so-called rake 1
0 and forcefully scrape up.

Further, the debris captured by the rake teeth 10a is then sequentially deposited on the rake flat plate portion 10b having the same directionality as the water flow.

Further, in this case, since the rake 10 has a structure having the same directionality as the water flow, the water flow resistance of the rake 10 is extremely reduced, so that the load of the rotational driving force of the rake 10 is also reduced.

Furthermore, in the conventional rake 31 shown in FIG. 12, a negative pressure is generated in the trailing area of the rake 31 which is in the shadow of running water, and a vortex is generated which causes a drop in water. Arrow X in figure 6
As shown in , the same directionality as the water flow is ensured and negative pressure is not generated in the downstream area, so
The above-mentioned vortex no longer occurs, and screen bar 1
It is possible to reliably capture and remove dust adhering to the rake 10, and furthermore, the generation of noise caused by the water level difference caused by the rake 10 itself can be extremely reduced.

Therefore, with this device, it is possible to automate the capture and removal of dust, and it is also expected that reliable dust removal will be possible and that noise will be greatly reduced.

The trash scraped up in the manner described above is carried into the trash accumulation trough 14, and then transported to an appropriate location.

``Effects of the Invention'' The present invention comprises a screen consisting of a screen bar having a through hole arranged at a gentle slope in a waterway, a rake that can be raised and lowered freely on this screen, and rake teeth provided on this rake and a water flow. This configuration captures and removes debris from the waterway through the rake plane plate portion having the same directionality, and has the following effects.

(1) The water resistance of the rake is extremely reduced, which has the effect of significantly reducing the resistance to movement of the rake.

(2) The reduction of the load of the rotational driving force of the rake, in combination with the through holes opened above the screen, has a great effect of reducing the load near the water surface where there is a large amount of trapped dirt.

(3) There is no generation of vortices in the downstream area of the rake.
Dust attached to the screen bar can be removed reliably. It also helps reduce noise.

(4) There is also less noise caused by the water level difference caused by rake migration.

Further, the present invention has a structure in which a through hole is opened in a part of the screen bar, and a part of the through hole is under the water surface or comes into contact with running water, and has the following effects.

(5) Screen bars can effectively respond to water flow resistance.

Furthermore, the present invention provides a rake equipped with a horizontal surface that slides into contact with the water flow while maintaining the same directionality as the water flow.
Since it is configured with rake teeth, it has the following effects.

(6) Dust trapped on the screen bar or between the screen bars can be removed reliably and with one touch by pulling up the rake.

(7) Dust entangled in the screen bars or between the screen bars can be reliably captured, which has the effect of ensuring a constant water flow cross-sectional area between the screen bars and eliminating pressure loss and overflow phenomena.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Figs. 1 to 5 show the first invention, and Figs. 1 to 3 show the first embodiment installed in a waterway with a gentle slope. The figure is a plan view of a partially cutout, Figure 2 is a side cross-sectional view, and Figure 3 is a cross-sectional view of a partially cutout. Figure 4 is a partially cutaway plan view, Figure 5 is a partially cutout side sectional view,
Figures 6 to 11 show the second invention, of which Figures 6 and 7 are installed on a gentle slope in a waterway.
Figure 6 is a side view of the partially cutout, Figure 7 is a cross-sectional view of the partially cutout, and Figures 8 to 11 show the open channel device installed approximately horizontally; Fig. 8 is a side sectional view of the bucket device mounted on the screen, Fig. 9 is a side sectional view of the bucket device separated from the screen and inverted, and Fig. 10 is a partially cutaway view of Fig. 8. 11 is a partially cutaway plan view of FIG. 9, and FIG. 12 is a schematic diagram showing the relationship between the conventional screen bar and rake. 1...Screen bar, 2...Waterway, 3...
Groove, 4... Through hole, 5, 6... Mounting body, 7... Submerged weir, 8... Intake pit, 10... Rake, 10a...
Rake teeth, 11... Endless chain, 12... Drive roller, 13... Guide roller, 14... Dust accumulation trough, 16... Bottom rod, 18... Mounting rod, 19
... Weight, 20 ... Rotating means, A ... Screen, B ... Bucket device.

Claims (1)

[Scope of Claims] 1. A screen comprising V-shaped, U-shaped, etc. screen bars with grooves facing upward, arranged at appropriate intervals in a waterway, wherein a part of the screen bars is provided for the passage of running water. a screen having a through hole, and a part of the through hole is always located below the water surface of the waterway and in contact with the flowing water, and the screen bar has a hole in the groove of the screen bar and a gap between the screen bars. An irrigation channel comprising: a rake having rake teeth inserted with a gap therein, and a horizontal surface that slides into contact with the water flow while maintaining the same directionality as the water flow; and a drive means for moving the rake. Isochannel dust removal equipment.