JPH0679109A - Automatically scraping device for submergence type weir screen - Google Patents

Abstract

PURPOSE:To provide a scraping device capable of miniaturizing the device, simplifying its structure and automatically removing impurities stuck on the surface of a weir type screen which is provided in a submerged state in a running waterway of a sewage treatment equipment, etc. CONSTITUTION:A crankshaft 24 driven by a motor 35 is provided in the upper part of a running waterway 1. A rake arm 27 is connected to the crankshaft 24. A correction link 30 is connected in the middle of the rake arm 27. Scraping working necessary for the rake 26 of the tip part is obtained along a submerged type weir screen 10 by the correction link 30. Thereafter evacuating working is so obtained that the rake 26 is lifted and returned. Thereby the device is miniaturized and its structure is simplified and also consumption of motive power is decreased. Moreover maintenance and inspection are easily performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic scraping device for automatically removing contaminants attached to the surface of a slanting screen provided in a running water channel of a sewage treatment facility or the like. It is intended to downsize and simplify the structure.

[0002]

2. Description of the Related Art Industrial wastewater, rainwater, sewage, etc.
Dust, kitchen waste, textiles, sticks, and everything else that we can imagine as garbage floats in.

Inhaling a large amount of such suspended matter with a pump without removing it not only causes an accident such as blocking the pump, but also sends it to a sewage treatment plant as it is, so that the function of the treatment facility is improved. To interfere,
Normally, a screen is installed in front of the sand basin or pumping station to remove large suspended matter.

As shown in FIG. 6, the screens that have been used up to now are generally 45 degrees with respect to the water surface 2 of the running water channel 1.
It is installed with an inclination of about 75 degrees, and the foreign substances on the surface of the screen 3 are scraped by a manual scraping device or a mechanical scraping device and carried out of the system.

[0005]

When such a screen 3 is installed to remove suspended matters, the area effectively used as the screen 3 varies depending on the water level of the sewage flowing into the running water channel 1. Even if the design corresponds to the maximum load that flows in, most of it is usually not used.

Further, there are various types of automatic scraping devices used for removing foreign matters on the screen 3, but an example of a device capable of continuous scraping is shown in FIG. As shown in, an endless chain 4 etc. is arranged along the screen 3 which is installed to be inclined with respect to the running water channel 1, and a plurality of rakes (rakes) 5 are attached. It is configured to be carried out to the outside of the system by a conveyor 7 or the like via a hopper 6 installed on the path 1, and is mounted on the conveyor 7 via the hopper 6 so that the rake 5 scrapes it to a position considerably above the running water path 1. Therefore, the scraping device is increased in size.

Further, since the foreign substances scraped off the screen 3 are released into the atmosphere, there is a problem of generation of a foul odor, but under the present circumstances, no countermeasure is taken and it is often accepted silently.

Then, various examinations were made on a screen capable of solving these problems at present,
It was considered that the type of screen 8 as shown in FIG. 4 was adopted, and the screen 8 was installed by being submerged in a part of the bottom part of the running water channel 1.

According to this type of screen 8 the running water channel 1
Since it is installed almost parallel or slightly inclined to the water surface 2 of, the entire screen 8 can always be effectively used regardless of the amount of inflow water, and by providing the slag pool 9 in front of the screen 8 or the like, It is possible to expect great effects such as being able to scrape and collect foreign substances in water and solve the problem that a foul odor is constantly generated.

The present invention has been made in view of the above-mentioned state of the art, and it is possible to automatically remove impurities attached to the surface of a shed type screen provided in a running water channel of a sewage treatment facility in a submerged state. It is an object of the present invention to provide an automatic scraping device for a submersible type spatula screen, which is capable of downsizing the device and simplifying the structure.

[0011]

In order to solve the above-mentioned problems, an automatic scraping device for a submersible type elbow screen according to the present invention scrapes off contaminants on the submerged type elbow screen provided in a running channel. In the automatic scraping device, a crankshaft that is driven to rotate is installed above the flowing water channel, and the base end of a rake arm having a rake for scraping foreign matter at its tip is rotatably connected to this crankshaft. Then, a straightening link for correcting the movement locus of the rake into a scraping operation along the spatula screen and a retracting operation that rises up and returns from the spatula screen is provided near the lower side of the crankshaft to provide an intermediate portion of the rake arm. It is characterized by being connected to.

[0012]

According to this automatic submersion device for a submerged type drainage screen, a crankshaft driven by a motor or the like is installed above the flowing water passage to connect the rake arms, and the tip portion is connected by the straightening link connected in the middle of the rake arms. I am trying to obtain the trajectory necessary for the operation of the rake, and I can easily obtain the scraping operation along the submerged type rain screen provided in the running water channel and the evacuation operation that rises and returns after this, The device is made smaller and the structure is simplified.

By connecting the rakes in the third quadrant and the fourth quadrant of the rotation of the crankshaft in the xy coordinates, it is possible to approximate the rake from the sine value of the crankshaft length by the rake. The locus of the approaching motion can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 4 show an embodiment of an automatic scraping device for a submerged type drainage screen according to the present invention. FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a side view, and FIG. 4 is a whole running water channel. FIG.

First, referring to FIG. 4, an explanation will be given of a submersible type screen (hereinafter simply referred to as a screen) 10 for scraping foreign matters by an automatic scraping device 20 for the submersible type screen of the present invention.

The submerged type screen 10 is formed in a circular shape having a slightly curved outer shape or a rectangular shape like the conventional screens, and the screen members 11 are arranged at regular intervals.
Is attached to a part of the bottom 11 of the flowing water channel 1 and is attached substantially parallel to the water surface 2 or at a slight inclination.

The running water channel 1 in front of the screen 10
A slag pool 9 is formed on the wall of the slag and is separated by a partition wall 12 so as not to mix with sewage that has passed through the screen 10.

Therefore, while the raw water 14 such as sewage flowing into the running water channel 1 from the inflow pipe 13 flows into the partition wall 12, floating matters are removed while passing through the submerged screen 10, and these are contaminated. It accumulates on the screen 10 as an object. On the other hand, the sewage that has passed through the screen 10 is sent to a pump pond 15 or the like and sucked by a pump (not shown) to perform sewage treatment.

By adopting the submerged type screen 10 as described above, the effective area of the screen 10 does not change depending on the amount of inflowing water as compared with the conventional screen installed at an angle of 45 to 75 degrees, and its length or The water surface load condition can be determined by the area, and if the effective area is the same, the water surface load condition can be made smaller than the conventional one, and the aperture ratio can be made large in view of strength.

Further, by scraping the screen slag accumulated on the screen 10 to the slag pool 9 in front,
The screen slag can always be stored in a water-sealed state, and only when it is carried out, it is sufficient to suck it with a pump or the like and take it out of the system, which solves the problem of odor.

It is the automatic scraping device 20 of the present invention that scrapes foreign matter (screen sludge) accumulated on such a submerged screen 10 to the front sludge pool 9.

As shown in FIGS. 1 to 3, an automatic scraping device 20 for a submerged type spatula screen is provided with a pedestal 21 integrated with the screen 10 installed in the running water channel 1. Bearing bases 22 are arranged at both ends of the upper screen 10 in the width direction, and a crankshaft 24 is rotatably supported via bearings 23.

A rake arm 2 having a rake 26 attached to a tip end of a crank pin 25 of the crank shaft 24.
The base end of 7 is rotatably connected.

As shown in FIGS. 1 and 2, the rake 26 is fitted between the screen members 11 of the screen 10 so that the screen slag can be scraped up.

The rake arm 27 is divided into upper and lower arm members 27a and 27b and connected by a pin 28, and the rake 26 at the tip is provided between the arm members 27a and 27b.
A safety device 29 is connected so that it can be retracted rearward when an excessive force is applied to it, and the spring 29a makes it normally linear so that the set load to be retracted can be changed in case of emergency. .

The rake arm 27 which is driven by being connected to the crankshaft 24 cannot move the rake 26 at the tip end along the screen 10.

Therefore, a scraping operation for scraping foreign substances while moving the rake 26 along the screen 10 and a retracting operation for retracting from the surface of the screen 10 and returning to the original position at the same time when the scraping is completed are performed. A correction link 30 is provided for this purpose.

The straightening link 30 is composed of a set of two links, and a base end portion is attached to a support shaft 32 supported by a bearing 31 attached below a bearing base 22 attached to the pedestal 21, and is rotated. This is made possible, and the tip portion is connected to the intermediate portion of the upper arm member 27a, which is the intermediate portion of the rake arm 27, by the pin 33.

The length of the crank arm of the crank shaft 24, the center position of rotation, the length of the rake arm 27, the length of the straightening link 30, the center position of rotation, etc. are determined by the shape of the screen 10. In this case, it is determined that the raking operation and the retracting operation of the rake 26 as shown in FIGS. 1 and 5 can be realized, the crank arm is 75 mm, the correction link is 120 mm, the rake arm is 750 mm, and the horizontal portion of the screen is used. This is the case where the radius of curvature of the subsequent curved portion is 530 mm.

For example, with the center of rotation of the crankshaft 24 as the origin and the plane of rotation as the xy coordinate, the crankshaft 2
When the rotation position of 4 is in the third quadrant and the fourth quadrant and the position of the upper end of the rake arm 27 is regulated, the straightening link 30 is connected to the middle portion of the rake arm 27 to regulate the angle of the rake arm 27. Then, the locus of the scraping operation by the rake 26 can be approximately obtained from the sine value of the length of the crankshaft 24, and thereby the above-mentioned respective lengths, the rotation center position, etc. can be obtained.

In order to rotationally drive the crankshaft 24, a motor 35 having a cyclo gear reducer 34 is mounted on the mount 21, and power is transmitted by two sprockets 36, 37 and a chain 38. For example, the speed of the rake 26 is set to about 4.6 m / min to scrape the rake.

In addition, the automatic scraping device 20 is provided with a wiper mechanism 40 so that the foreign substances scraped by the rake 26 can be surely dropped into the slag pool 9.

The wiper mechanism 40 includes the screen 10
The upper end of the wiper arm 41, which is provided near the scraping completion position, is rotatable via a bearing 42 attached to the pedestal 21, and the lower end of the wiper arm 41 is made of rubber or the like. A scraping plate 43 is attached to the scraping plate 43.
Is moved for scraping and hits the upper end of the rake 26 just before the scraping is completed. As shown in FIG. 1, the rake 26 is scratched by the difference in the rotation centers of the warper arm 41 and the rake arm 27. After the scraping plate 43 has come into contact with the rake 26, the scraping plate 43 moves from the upper end to the lower end of the rake 26 until the scraping by the rake 26 is completed. Drop it.

The scraping of the screen slag by the automatic scraping device 20 for the submerged type drainage screen constructed as described above is as follows.
This is done as follows.

First, the motor 35 is driven to rotate the crankshaft 24 through the cyclo speed reducer 34 in the clockwise direction as shown in FIGS.

Then, the position of the upper end of the rake arm 27 is regulated by the rotation of the crankshaft 24, and the position of the intermediate portion of the rake arm 27 is regulated by the straightening link 30, so that the rake 26 is positioned in the linear direction connecting the two points. In addition, the vertical position is determined by the position of the crankshaft 24.

As a result, as shown in FIG. 5, during the downward rotation of the crankshaft 24 from the rotational positions a through b, c, d to the rotational position e, the scraping operation along the screen 10 is performed and the rotation is performed. During the upper rotation from the position e to the rotation position a to the rotation position a, the retracting operation is performed in which the rake 26 moves upward from the screen 10 and returns to the scraping start position.

When the rake arm 27 reaches the rotation position d immediately before the completion of the scraping operation, the tip of the scraping plate 43 of the wiper mechanism 40 contacts the rake 26, and the scraping operation by the rake 26 proceeds. The screen scraps attached by the scraping plate 43 are scraped off and scraped off into the scrap pool 9.

According to the automatic scraping device 20 for such a submerged type drainage screen, the crankshaft 24 and the straightening link 30 are provided.
With the combination of the above, the rake 26 can perform a scraping operation, compared to a device that scrapes outside the running water channel using a conventional endless chain.
The device can be simplified and downsized.

The crankshaft 24, the straightening link 30,
The movable part of the raking device constituted by the rake arm 27 and the rake 26 can be made lighter than the conventional device, and the power consumption required for driving can be greatly reduced.

Furthermore, since the structure of the device is simplified,
It has great effects such as easy maintenance and inspection.

It is needless to say that the present invention is not limited to the above-mentioned embodiments, and that each constituent element can be changed within the range not changing the gist of the present invention.

[0043]

As described above in detail with reference to the embodiment, according to the automatic raking device for a submersible type spatula screen of the present invention, the rake arm is installed above the flowing water channel so that the crankshaft is driven to rotate. The straightening link connected in the middle of the rake arm was used to obtain the trajectory required for the rake operation at the tip, so the raking operation along the submerged type elbow screen provided in the running water channel and this It is possible to easily obtain an evacuation operation that rises and then returns, and it is possible to reduce the size of the device and simplify the structure.

Further, due to the miniaturization and simplification of the device,
The weight can be reduced and the driving force can be greatly reduced.
Maintenance and inspection becomes easy.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of an automatic scraping device for a submerged type spatula screen according to the present invention.

FIG. 2 is a plan view of an embodiment of an automatic scraping device for a submersible type spatula screen according to the present invention.

FIG. 3 is a side view of an embodiment of an automatic scraping device for a submersible type spatula screen according to the present invention.

FIG. 4 is an overall sectional view of a running water channel according to an embodiment of an automatic scraping device for a submersible type spatula screen according to the present invention.

FIG. 5 is an operation explanatory view of an embodiment of an automatic scraping device for a submersible type spatula screen according to the present invention.

FIG. 6 is a schematic configuration diagram of a conventional automatic screen scraping device.

[Explanation of symbols]

 1 Flow Channel 2 Water Surface 9 Dust Retainer 10 Submerged Rattle Screen (Screen) 11 Bottom 12 Partition Wall 13 Inlet Pipe 14 Raw Water 20 Automatic Submerged Rattle Screen Scrubber 21 Stand 24 Crankshaft 26 Rake 27 Rake Arm 30 Correction Link 34 Cyclo Speed reducer 35 Motor 40 Wiper mechanism

Claims (1)

[Claims] 1. An automatic scraping device for scraping foreign matter on a submerged type drooping screen provided in a running water channel,
A crankshaft that is driven to rotate is installed above the running water channel, and the base end of a rake arm provided with a rake that scrapes foreign matter at its tip is rotatably connected to this crankshaft,
A straightening link is provided near the lower side of the crankshaft to correct the movement locus of the rake to a scraping operation along the bowl screen and a retracting operation to rise and return from the bowl screen, and is connected to an intermediate portion of the rake arm. An automatic scraping device for submerged type drainage screens.