JPH0647959Y2 - Dust remover - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a dust remover in which dust collected by a bar screen provided in a water channel such as an irrigation channel and a drainage channel is scraped up by a rake and discharged.

[Prior Art] Conventionally, in this type of dust remover, a rake is attached to an endless chain, and the chain is rotated by a motor or the like to rake up dust collected by a bar screen installed in a waterway. Are discharged. Further, the lower end of the bar screen is arranged with a space from the bottom surface of the water channel in order to secure a space for the rake to pass through. Therefore, it is located on the upstream side of the bar screen and below the bar screen. An auxiliary screen is provided to prevent dust from passing through the gap between the bar screen and the bottom of the water channel. However, such a dust remover is apt to be clogged at the auxiliary screen portion, and dust such as earth and sand is accumulated near the auxiliary screen after long-term use. For this reason, there has been a problem that not only the rake cannot be smoothly rotated but the dust captured by the bar screen cannot be satisfactorily scraped up, but also the motor is loaded and its durability is reduced.

In consideration of such a problem, in JP-A-62-33917, a frame having a screen and an auxiliary screen is fixed in a water channel, and a water tube channel is provided at or near the rotation axis of the auxiliary screen. There has been proposed a dust remover configured to remove high pressure water from a plurality of water jet nozzles mounted at predetermined intervals in the water pipe to remove dust around the auxiliary screen.

[Problems to be Solved by the Invention] In the above-described conventional example, the water pipe in which the water jet nozzle is mounted supplies high-pressure water to the jet nozzle, so that it is formed in a hollow shape and weak in strength. It is laid over the frame and placed in the water conduit, and there is a risk of damage due to collision with driftwood, stones, rocks, etc. Therefore, in order to protect the hollow water channel, which is weak in strength, on the upstream side of the auxiliary screen, the guide dike section that avoids collision of driftwood, stones, rocks, etc. on the water channel is installed on the bottom wall of the channel. The guide ridge portion causes a turbulent flow, resulting in a structure in which dust easily accumulates around the auxiliary screen. Further, in order to effectively remove dust accumulated before and after the auxiliary screen, it is necessary to provide two water pipe passages before and after the auxiliary screen. , The number of parts also increases. In addition, since the high-pressure water is jetted from the jet nozzle, the fluid resistance in the pipe line is large, and in a long water pipe line, the jet pressure of water weakens as the distance from the pressure supply source such as a pump increases, There is a concern that dust cannot be removed uniformly.

The present invention is intended to solve such a problem,
An object of the present invention is to provide a dust remover that does not require a special structure for protecting the air pipe, can reduce the number of parts, and can reduce the resistance in the air pipe to uniformly remove dust.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a bar screen that is inclined over the entire width of a water channel, and an endless chain that rotates along both sides of the bar screen. , A rake attached to this chain that scrapes up and discharges the debris captured by the bar screen, an auxiliary screen that prevents passage of the debris between the bar screen and the bottom of the water channel, and this auxiliary An injection device provided below the screen for blowing away dust accumulated around the auxiliary screen, the injection device being embedded along a lower portion of the auxiliary screen in a bottom wall portion of the water channel, and having a bottom surface of the water channel on an upper surface. The flat surface is formed by an air pipe having a flat surface that is continuous with the wall and formed into a substantially semicircular cross section, and an air supply device that supplies compressed air to the air pipe. Is provided with a plurality of injection holes at least before and after the auxiliary screen.

[Operation] In the present invention, the dust flowing in the water channel is caught on the bar screen, and the dust captured by the bar screen is scraped up by the rake and discharged. On the other hand, the debris flowing in the gap between the bar screen rake and the water channel is caught by the auxiliary screen, and the debris captured by this auxiliary screen is sprayed by the compressed air supply device located before and after the auxiliary screen. It is scattered by the air jetted from the holes, and the scattered dust is captured by the bar screen and removed by the rake. Further, the air pipe is buried in the bottom wall portion of the water channel without blocking the water channel, and the flat surface of the upper surface of the air pipe is continuous with the bottom wall portion of the water channel. The air pipe has a wide flat surface on the upper surface and has a large cross-sectional shape. By supplying air to such a large air pipe, the resistance in the air pipe is suppressed to a small level, and the air is uniformly discharged from each injection hole. It is possible to effectively remove dust accumulated on the auxiliary screen portion by injecting air into the.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 4 show a first embodiment of the present invention, in which 1 is a bar screen in the form of a vertical lattice supported by a frame body 2, which is inclined over the entire width of the water channel A. Is provided. A front plate 3 of the frame 2 is formed along the bar screen 1 on both sides of the bar screen 1, and guide rollers 4 made of a resin such as MC nylon are arranged on the front plate 3 at substantially equal intervals. It is rotatably installed.

Reference numeral 5 denotes a pair of endless chains located on both sides of the bar screen 1 and guided and supported by the guide rollers 4.
The chain 5 is mounted between a drive sprocket 7 connected to a motor 6 installed on the upper part of the water channel A and a driven sprocket 8 provided on the bottom part of the water channel A, and the chain 5 serves as a scraper. Motor 6 with rake 9 fixed
Is driven to raise the rake 9 along the bar screen 1 via the chain 5, and the rake 9 picks up the dust trapped on the bar screen 1 and drops it onto the discharge conveyor 10.

Further, an apron 11 is provided on the upper portion of the bar screen 1, and its lower end portion is arranged with a gap from the bottom portion of the water channel A so that the rake 9 can pass therethrough. An auxiliary screen 12 is provided on the frame 2 at the bottom of the water channel A located upstream of the bar screen 1 in order to prevent the flow of waste.

Reference numeral 13 is a spraying device for removing the sediment deposited on the auxiliary screen 12, a compressor 14 for generating compressed air and an air pipe 15 provided along the lower portion of the auxiliary screen 12.
The air pipe 15 is formed in a substantially semi-circular shape having a wide flat surface 15A on the upper surface, and the flat surface 15A has a plurality of injection holes 16 positioned in front of and behind the auxiliary screen 12. Are perforated at appropriate intervals.

Then, when the sediment, dust, etc. in the water channel A are accumulated on the auxiliary screen 12, the compressor 14 is started, and the compressed air from the compressor 14 is injected into the injection hole 16 of the air pipe 15.
The rake 9 is smoothly rotated by ejecting the rake 9 from the bar screen 1 by scattering it to remove it.
It is possible to stably remove the dust and dirt captured by, and to reduce the load on the motor 6 and improve its durability.

Further, the air pipe 15 is embedded in the bottom wall portion of the water channel A along the lower portion of the auxiliary screen 12, and the upper surface of the air pipe 15 is formed as a flat surface 15A continuous with the bottom wall portion of the water channel A. The air pipe 15 is not damaged by floating matter such as driftwood colliding with the air pipe 15 without blocking the water channel. Therefore, as in the conventional example,
There is no need to provide a special guide bank to protect the air pipe 15. Further, since the bottom wall portion of the water channel A and the flat surface 15A of the air pipe 15 buried in the water channel A are continuous with each other, no turbulent flow occurs, and dust and the like around the auxiliary screen 12 are less likely to accumulate. In addition, the wide flat surface 15A has an auxiliary screen 1
It is also possible to form the injection holes 16 at positions before and after 2, and dust can be effectively removed by one air pipe 15, and the number of parts can be reduced. Further, the air pipe 15 has a wide flat surface 15 on the upper surface, and has a large cross-sectional shape. By supplying air to such a large air pipe 15, the resistance of the air pipe 15 can be suppressed to a low level. For this reason, there is little difference in the ejection pressure of the air ejected from the ejection holes 16 close to the compressor 14 and the ejection holes 16 distant from each other, and it is possible to uniformly eject from the ejection holes 16 and accumulate on the auxiliary screen 12 portion. It can be effectively removed without the concern that dust that remains will partially remain.

The present invention is not limited to the first embodiment, and various modifications can be made within the scope of the present invention. For example, the auxiliary screen has a bar shape as shown in FIG. A rod-shaped auxiliary screen 12A having a curved upper portion may be provided below the screen 1, and the injection hole 16 may be provided.
In the first embodiment described above, two pieces are provided on the front side and the rear side of the auxiliary screen 12, but the air pipe 15 is formed wide and the three injection holes 16 are provided at appropriate intervals. They may be provided, and the number thereof may be appropriately selected. Further, an air valve 17 may be provided between the air pipe 15 and the compressor 14, and air may be injected by opening / closing the air valve 17. Also, the shape of the air pipe may be appropriately selected.

[Effects of the Invention] The present invention provides a bar screen that is inclined over the entire width of a water channel, an endless chain that rotates along both sides of the bar screen, and is attached to the chain. A rake for scraping up and discharging the supplemented garbage, an auxiliary screen for preventing passage of the garbage from between the bar screen and the bottom of the water channel, and a sub-screen provided under the auxiliary screen and around the auxiliary screen. An injector for blowing away accumulated dust, the injector is embedded along the lower portion of the auxiliary screen in the bottom wall of the channel, and has a flat surface on the upper surface that is continuous with the bottom wall of the channel. An air pipe having a substantially semicircular cross section and an air supply device for supplying compressed air to the air pipe, and the flat surface has at least the auxiliary screen. A special structure that protects the air pipe is not required because multiple injection holes are provided, and the number of parts can be kept low and the resistance inside the air pipe can be reduced to remove dust uniformly. Machine can be provided.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a perspective view, FIG. 2 is an overall sectional view, FIG. 3 is a front view with a part omitted, and FIG. And FIG. 5 is a sectional view of the essential part showing a modified example of the present invention. 1 ... Bar screen 5 ... Chain 9 ... Rake 12, 12A ... Auxiliary screen 13 ... Injection device 14 ... Compressor (compressed air supply device) 15 ... Air pipe 15A ... Flat surface 16 ... Injection hole A ... Water channel

Claims (1)

[Scope of utility model registration request] 1. A bar screen inclined along the entire width of a water channel, an endless chain that rotates along both sides of the bar screen, and a piece of garbage attached to the chain and supplemented by the bar screen. A rake for picking up and discharging the dust, an auxiliary screen for preventing passage of dusts from between the bar screen and the bottom of the water channel, and a dust provided around the auxiliary screen and accumulated around the auxiliary screen. And an injection device for blowing away the water, the injection device is embedded in the bottom wall portion of the water channel along the lower portion of the auxiliary screen, and has a flat surface that is continuous with the bottom wall portion of the water channel on the upper surface and has a substantially semicircular cross section. And a compressed air supply device for supplying compressed air to the air pipe, and the flat surface is positioned at least before and after the auxiliary screen. Dust remover, characterized in that a plurality of injection holes Te.