JPH0742131A - Auto-screen - Google Patents

Abstract

PURPOSE:To sharply reduce the accumulation of garbage at the bottom section in a conduit by using an auto-screen raking and removing the garbage captured by a screen with a circulatorily traveled rake. CONSTITUTION:A rake 31 is provided with an auxiliary screen 51 rotated around a matrix screen 16 and erected from the bottom face 12 in a conduit 11 to the front position of the lower end section of the main screen 16. The auxiliary screen 51 has a circular arc shape, and nearly the whole auxiliary screen 51 is formed along the locus of the rake 31. In this way, the comb teeth 37 of the rake 31 pass between the bars of the auxiliary screen 54 from the position behind the lower position of the lower end of the main screen 16 to the upper end. Lugs 38 protruded in the advance direction of the rake 31 are provided at the tip sections of the comb teeth 37. Captured garbage is raked at the lower section of the auxiliary screen 51. The raking effect of the rake 31 itself is improved by the lugs 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust remover installed in a waterway such as a river, an intake, a water and wastewater treatment plant, a wastewater treatment plant, or an intake of a hydroelectric power plant, and particularly to dust collected on a screen. The present invention relates to a dust remover for removing scraps by scraping them with a circulatory rake.

[0002]

2. Description of the Related Art Conventionally, as described in, for example, Japanese Utility Model Laid-Open No. 1-141824, there is known a dust remover for scraping dusts trapped on a screen by a circulating rake to remove them. FIG. 4 shows the lower end of a conventional dust remover of this type. In FIG. 1, reference numeral 1 is a water channel, and 2 is a bottom surface of the water channel 1. Then, in the water channel 1, a main screen 4 is vertically arranged via a support frame 3. The main screen 4 is a vertical grid bar screen. In addition, a chain 5 is provided on both sides of the main screen 4.
Is provided. The chain 5 circulates so as to rise on the front side, that is, the upstream side (left side in the drawing) and descend on the rear side, that is, the downstream side (right side in the drawing). Further, the chain 5 is hung on the driven sprocket 6 located near the lower end of the main screen 4, and here it is turned from bottom to top. The rake 7 is fixed to the chain 5.

In the dust remover in which the rake 7 circulates as described above, since the rake 7 goes around the lower end of the main screen 4, there is a gap between the lower end of the main screen 4 and the bottom surface 2 in the water channel 1. There must be a gap in. If left as it is, dust and debris will not be captured and will flow into the downstream side through this gap. Therefore, in this type of dust remover, the auxiliary screen 8 is provided. The auxiliary screen 8 is also composed of a vertical lattice-shaped bar screen, but rises from the bottom surface 2 in the water channel 1 to the front position below the main screen 4. Further, in the conventional dust remover, the auxiliary screen 8 is attached to the bottom surface 2 in the water channel 1 in front of the lower position of the lower end of the main screen 4, and the whole is substantially vertical. Further, although the rake 7 has comb teeth 9 that pass between the bars of the auxiliary screen 8, in the conventional dust remover, the comb teeth 9 are simply flat plate shapes substantially orthogonal to the traveling direction of the rake 7. It has become a thing.

[0004]

As described above, in the conventional dust remover in which the rake 7 circulates, the auxiliary screen 8 is located at the bottom of the water channel 1 in front of the lower position of the lower end of the main screen 4. Since it is attached to No. 2 and the whole is almost vertical, there is a problem that dust particles A trapped in the lower portion of the auxiliary screen 8 remain without being pulled up by the rake 7. That is, in FIG. 4, the locus B of the tip of the comb tooth 9 of the rake 7 is shown by a chain line. As can be seen from this, the comb tooth 9 comes to a height of about half the height of the auxiliary screen 8 and finally the auxiliary screen. Enter between 8 bars. Therefore, in the lower part of the auxiliary screen 8 where the comb teeth 9 do not enter, the dusts A trapped therein are not carried by the rake 7 and remain deposited on the bottom of the water channel 1.

Further, since the comb teeth 9 are simply flat plates which are substantially orthogonal to the traveling direction of the rake 7, there is a problem that the scraping effect of the dust A is weak.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a dust remover capable of significantly reducing the accumulation of dust and dirt trapped by the auxiliary screen. Moreover, it aims at providing the dust remover which can improve the scraping effect of the rake itself.

[0007]

In order to achieve the former object, the dust remover according to the first aspect of the invention is arranged vertically in a water channel with a gap between the dust remover and the bottom surface of the water channel. A main screen, a rake that rises on the front side of the main screen and descends on the rear side to circulate, and a guide member that guides and reverses the rake at the lower end of the main screen,
An auxiliary screen comprising a bar screen that rises from the bottom surface of the water channel to a front position below the main screen, and the rake passes through the rear side, and the rake has comb teeth passing between the bars of the auxiliary screen. In the machine, the auxiliary screen has a shape in which the comb teeth of the rake pass between the bars from a position below the lower end of the main screen to a position above the lower end of the main screen. is there.

Further, in order to achieve the latter object, the dust remover of the second aspect of the invention is similarly arranged vertically in the water channel with a gap between the bottom surface and the bottom. A main screen, a rake that rises on the front side of the main screen and descends on the rear side and circulates, a guide member that guides and reverses the rake at the lower end of the main screen, and a main member from the bottom of the water channel. In a dust remover having a comb screen that rises to a front position below the screen and the rake passes through the rear side, the rake is a dust remover having comb teeth that pass between the bars of the auxiliary screen. Is provided with a protrusion projecting in the direction of movement of the rake.

[0009]

In the dust remover according to the first aspect of the present invention, dust particles flowing in the water channel are trapped on the front side of the main screen and the auxiliary screen, and the trapped dust particles are scraped up by the rake rising on the front side of the main screen. Are removed. The rake circulates and is guided by the guide member to rotate around the lower end of the main screen and reverse, but at this time, the comb teeth pass between the bars of the auxiliary screen and carry the dust trapped on the auxiliary screen. And pull up. The auxiliary screen rises from the bottom of the waterway, but almost entirely follows the path of the rake, and the comb teeth of the rake extend from the lower position to the upper end of the lower end of the main screen. Pass through Therefore, even at the lower portion of the auxiliary screen, that is, at a position very close to the bottom surface in the water channel, the dust trapped on the auxiliary screen is carried by the rake.

Further, in the dust remover according to the second aspect of the present invention, the projections at the tips of the teeth of the rake that project toward the advancing direction of the rake catch the dusts, thereby effectively scraping the dusts. To be Most of the dust particles are string-shaped such as reeds and kaya, and when one string-shaped dust particles are caught by the protrusions and lifted, they are collectively entangled and pulled up.

[0011]

EXAMPLES Examples of the dust remover of the present invention will be described below.
Description will be made with reference to FIGS. 1 to 3. In the drawing,
11 is a water channel, and 12 is the bottom of this water channel 11. 16 is a main screen, and this main screen 16 is a bar screen in the form of a vertical lattice, and is composed of a large number of bars 17. The main screen 16 is vertically arranged in the water channel 11 via the support frame 18 in a slightly inclined state, and the lower end is the bottom surface 12 in the water channel 11.
There is a gap between and. And the support frame
A drive sprocket 21 is axially mounted on the main screen 16 near the upper end of the main screen 16, and a driven sprocket 22 as a guide member is axially mounted near the lower end. Further, the support frame 18 is provided with a guide rail 23 along the front surface side of the main screen 16, that is, the upstream side (left side in FIGS. 1 and 2). A substantially semicircular curved portion 24 is formed along the sprocket 22. In addition, the support frame 18,
A short guide rail 25 is provided on the rear side of the main screen 16, that is, on the downstream side (right side in FIGS. 1 and 2).

Reference numeral 26 denotes an endless chain that is stretched over the sprockets 21 and 22, and there are a pair of left and right chains 26, which are raised along the guide rails 23 and 25 by the front guide rail 23 and rearward. The guide rail 25 circulates so as to descend. The chain 26 is composed of a pair of chain links 27 and a roller 29 rotatably supported at the end of the chain link 27 via a pin 28, and a plurality of them are connected together. . A rake 31 is passed and fixed between the left and right chains 26. These rakes 31 are equidistant from each other. That is, in each rake 31, both ends of the rake body 32 are connected to the chain links 27 of the left and right chains 26 via the support shafts 33, respectively. A first comb body 34 and a second comb body 35 are fixed to the rake body 32 on the traveling direction side. These combs 34 and 35 have flat plate-like comb teeth 36 and 37, respectively, which are substantially orthogonal to the direction of travel of the rake 31. The comb teeth 36 of the first comb body 34 pass between the bars of the main screen 16. On the other hand, at the tip of the comb teeth 37 of the second comb body 35 on the opposite side, protrusions 38 projecting in the traveling direction of the rake 31 are provided. These protrusions 38
Has a tapered (fork-shaped) tip.
Further, 41 is a motor, which drives the chain 26 by transmitting power to the drive sprocket 21 via a chain 42. Further, 43 is an apron conveyor.

Reference numeral 51 is an auxiliary screen, and this auxiliary screen 51 is a bar screen in the form of a vertical lattice, and has a large number of bars.
It consists of 52. Further, the auxiliary screen 51 has a lower end mounting seat 53 fixed to the bottom surface 12 in the water channel 11 by anchor bolts 54, rises to the front position of the lower end portion of the main screen 16, and the rake 31 passes through the rear side. It is a thing. At this time, the comb teeth 37 of the second comb body 34 pass between the bars 52 of the auxiliary screen 51. In addition, the auxiliary screen 51
Has an arc shape, and almost entirely follows the locus C of the tips of the comb teeth 37. The mounting seat 53 is located rearward of the lower position of the lower end of the main screen 16. As a result, the comb teeth 37 of the rake 31 are not
It passes between 52 and from the lower position of the lower end of the main screen 16 to the upper end.

Next, the operation of the above configuration will be described. By driving the motor 41, the chain 26 turns clockwise in FIG. 1, and the rake 31 circulates together with the chain 26. Then, the rake 31 that rises on the front side of the main screen 16 scrapes up and removes the dust collected on the front side of the screens 16 and 51, that is, on the upstream side, flowing in the water channel 11. The scraps that have been scraped down fall onto the apron conveyor 43 as the rake 31 turns around the drive sprocket 21 and reverses. After that, the rake 31 descends on the rear side of the main screen 16, turns around the lower end of the main screen 16 with the driven sprocket 22 and reverses, and again the main screen 16
Rise in front of.

Then, while rotating the driven sprocket 22, the comb teeth 37 of the rake 31 pass between the bars 52 of the auxiliary screen 51, and the dust trapped on the auxiliary screen 51 is carried and pulled up. . At this time, the auxiliary screen 51
Almost along the locus 31 of the rake 31 and its comb teeth
Since 37 passes between the bars 52 from the position below the lower end of the main screen 16 to the upper end, the auxiliary screen
Even in the lower part of 51, that is, at a position very close to the bottom surface 12 in the water channel 11, dust collected on the auxiliary screen 51 is raked.
It will be taken by 31. Therefore, the waterway
Deposition of dust at the bottom of 11 is greatly reduced.
Especially when the water level is low, a large amount of dust is generated on the main screen 16
Since it will be captured by the auxiliary screen 51 rather than
It is effective.

Further, the protrusion 38 provided at the tip of the comb teeth 37 of the rake 31 greatly improves the effect of scraping up the rake 31 itself. In other words, the projections 38 protruding from the comb teeth 37 in the traveling direction of the rake 31 hook the dust and dirt, whereby the dust and dirt are effectively scraped up. Moreover, since the tip end of the protrusion 38 is sharpened in a taper shape, the scraping effect is further improved. Most of the dust particles are string-shaped such as reeds and kaya, and when one string-shaped dust particles are caught by the protrusions 38 and lifted, they are collectively entangled and pulled up.

The present invention is not limited to the above embodiment, and various modifications can be made. For example,
The driven sprocket may be provided as needed, and the chain may be guided only by the curved portion of the guide rail. Further, the main screen is not limited to the bar screen. Further, the protrusion provided on the tip of the comb tooth that passes through the auxiliary screen in the rake not only fixes a separate protrusion to the comb, but also bends the tip of the comb tooth formed on the plate-shaped member forming the comb. It may also be formed by the above.

[0018]

According to the first aspect of the present invention, in addition to the main screen in which the rake is of a circulating traveling type and has a gap between the rake and the bottom surface in the water channel, the rake rises on the front side and descends on the rear side. , In a dust remover equipped with an auxiliary screen consisting of a bar screen that rises from the bottom of the waterway and passes the rear side of the rake, the auxiliary screen is almost entirely along the rake locus and is located rearward of the lower position of the lower end of the main screen. Since the rake comb teeth pass between the bars from the top to the top, the dust caught in the auxiliary screen can be carried by the rake even at a position very close to the bottom of the auxiliary screen, that is, the bottom of the water channel. Dust accumulation in the inner bottom can be greatly reduced.

Further, according to the invention of claim 2, since the projections protruding toward the advancing direction of the rake are provided at the tips of the comb teeth of the rake, the raking effect of the rake itself is significantly improved. To be made.

[Brief description of drawings]

FIG. 1 shows an embodiment of a dust remover of the present invention and is a vertical sectional view of the whole.

FIG. 2 is an enlarged view of a lower end portion of FIG.

3 is a sectional view taken along line III-III of FIG.

FIG. 4 shows an example of a conventional dust remover and is a vertical cross-sectional view of a lower end portion.

[Explanation of symbols]

 11 Channel 12 Bottom surface in channel 16 Main screen 22 Driven sprocket (guide member) 31 Rake 37 Comb teeth 38 Projection 51 Auxiliary screen C Rake of comb teeth on rake

Claims (2)

[Claims] 1. A main screen vertically arranged in a water channel with a gap between the main screen and a bottom surface of the water channel, and a rake that circulates by going up in front of the main screen and down in the rear. A guide member that guides and reverses the rake at the lower end of the main screen, and an auxiliary screen that is a bar screen that rises from the bottom surface of the water channel to the front position of the lower portion of the main screen and the rake passes through the rear side. Wherein the rake is a dust remover having comb teeth passing between the bars of the auxiliary screen, the auxiliary screen is substantially entirely along the locus of the rake, and is located rearward of a lower position of a lower end of the main screen. A dust remover, characterized in that the teeth of the rake pass through between the bars from the top to the top. 2. A main screen vertically arranged in a water channel with a gap between the main screen and a bottom surface of the water channel, and a rake that circulates by going up in front of the main screen and down in the rear. A guide member that guides and reverses the rake at the lower end of the main screen, and an auxiliary screen that is a bar screen that rises from the bottom surface of the water channel to the front position of the lower portion of the main screen and the rake passes through the rear side. In the dust remover having comb teeth passing between the bars of the auxiliary screen, the rake is provided with a protrusion protruding toward the advancing direction of the rake at the tip end of the comb teeth of the rake. And dust remover.