JPH06116925A - Dust removing device - Google Patents

Abstract

PURPOSE:To suppress the increase of a water level difference by a method wherein elongated openings each having a moving cover are formed on both sides of a net type screen for collecting refuse and when a trouble on the passage of water owing to the rapid increase of refuse occurs, the moving cover automatically opens to cause discharge of only flow water through the opening. CONSTITUTION:During normal operation, flow water is caused to pass, as shown by flows A, through a net type screen 51. After refuse is collected by means of the screen 51, an endless link chain to which the screen 51 is attached is rotated to recover the refuse. When a water level difference between positioned before and after a device is abnormally increased owing to the rapid increase of the refuse, the whole surface of the screen 51 is covered with the refuse and a flow water press force is exerted on a screen frame 40. A moving cover 50 is opened around a hinge 47 serving as a fulcrum, flow water flows, as shown by flows B, through an opening 46, and the escape of the refuse to a downstream is blocked by a labyrinth 48. When the refuses is further decreased and a water level difference is decreased, the cover 50 is restored to a closed state through the force of a compression spring 61. This constitution causes prevention of the damage of a device through suppression of the increase of a water level difference and suppression of the outflow of the refuse to a minimum limit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust remover for removing dust from seawater or river water, and more particularly to a dust remover for preventing an abnormal water level difference before and after the dust remover caused by a large amount of dust temporarily flowing in. .

[0002]

2. Description of the Related Art Conventionally, generally used dust removers have been widely used in industrial water canals or water canals for collecting cooling water in power plants, and the most well-known ones are water canals. A link chain is provided on both sides, and a bar screen or a screen made of wire mesh is erected vertically or almost perpendicularly to the flow direction for each link of this link chain, and the dust caught on the screen is rotated by rotating it. There is a structure to remove it outside the waterway.

4 to 6 show one embodiment of a conventional dust removing device, FIG. 4 is an overall schematic view, FIG. 5 is a vertical sectional view of a screen frame, and FIG. 6 is a front view of the screen frame.

In FIG. 4, 1 is an upper sprocket wheel, 2 is a lower sprocket wheel, 3 is a link chain endlessly mounted on both sprocket wheels 1 and 2, and 4 is a lower part attached to the link chain 3. A screen frame having a bucket portion for storing the collected dust, a power unit 5 for transmitting power to the upper sprocket wheel 1 via a transmission chain 6 and a chain wheel 7, 8 a shaft of the upper sprocket wheel 1, and 9 a trough 10. A guide plate for guiding dust, a housing 11 of the dust removing device, a flowing water channel 12, and an arrow F indicates a flowing water direction.

As shown in FIG. 5, the screen frame 4 is attached at every pitch of the link chain 3, and 14 is a screen main body, which is composed of a large number of rods arranged in the shape of a wire mesh or a plow, and is dust in running water. It is a member that scoops up this as well as prevents it.

Reference numeral 15 is an upper beam provided on the upper end of the screen body 14, and the upper beam 15 is a pipe having a diameter suitable for the width of the water channel, and the center of which is the roller 3b of the link chain 3. The screen body 14 is integrally fixed via a mounting plate 16 provided so as to be located at the center of the screen and projecting from the lower part thereof.
Reference numeral 17 denotes a lower beam having a U-shaped cross section provided at the lower end of the screen body 14, and the lower beam 17 rotatably covers the upper portion of the upper beam 15 of the screen frame 4 adjacent to the lower portion thereof. The screen body 14 is integrally fixed via a mounting plate 18 provided on the upper part of the screen.

Reference numeral 19 denotes a side plate for holding the screen body 14 from its side portion. The side plate 19 has a width wider than the link width of the link chain 3 as shown in FIG. It is fixed integrally to each end face. In other words, the side plate 19, the upper beam 15 and the lower beam 17 form a frame body (screen frame 4) for holding the screen body 14. Then, the frame body is fixed to the Linlichen 3 by fixing the side plate 19 to the side surface of the link 3a with the bolt 20. Reference numeral 21 denotes a dust bucket projecting from the lower beam 17, and the dust bucket 21 is provided so as to obliquely cover the lower front part of the screen body 14, and the left and right ends of the dust bucket 21 are provided with side plates 19 via a support plate 22. Is integrally fixed to. Reference numeral 23 is a spray pipe provided on the back of the descending screen 13 for ejecting spray water to the back surface of the screen 13 as shown by a chain line so as to remove the dust attached to the screen body 14. Is. Therefore, dust and the like floating in the flow are first blocked by the screen body 14, and are scooped up by the dust bucket 21 as the link chain 3 rises, and the dust bucket 21 containing the dust further rises, and the upper sprocket 1 It becomes horizontal at the top of, then flips and descends.

The dust existing in the dust bucket 21 falls due to its gravity, and is guided by the outer surface of the dust bucket 21 of the lower screen and the guide plate 9 to form the water channel 10.
Is discharged inside. On the other hand, dust and the like adhering to the screen body 14 is separated by the spray water and discharged to the trough 10 via the outer surface of the dust bucket 21 of the lower screen and the guide plate 9 as described above.

The endless link chain 3 to which the screen frame 4 constructed as described above is joined is usually driven by the upper sprocket wheel 1 having about 6 teeth. In addition,
The L arrow indicates the link chain driving direction.

[0010]

In recent years, as the amount of water intake increases, the width of the water channel becomes wider, while the dust particles floating in the water channel tend to increase, and the inflow dust particles also frequently increase rapidly. Especially when a large amount of dust such as paddy fields in summer is temporarily concentrated and flows in, the screen surface is almost completely covered so that the running water cannot pass through. The water level difference exceeds 1500 mm, and sometimes reaches 2000 mm in severe cases. Therefore, a large force is applied to the screen frame and the link chain, which shortens the life of the link chain and causes a serious accident such as damage to the link chain, causing operation. There were problems such as cancellation.

[0011]

In order to solve the above-mentioned problems, an endless link chain is joined to a screen frame having a net screen for collecting dust, and the link chain is paired with a pair of upper and lower sprockets. In a dust remover driven via a foil, vertically long openings are provided on both sides of the screen frame, and a movable lid for covering the opening is provided on the rear surface side of the opening, and one end of the movable lid is provided with a hinge. And the other end is pressed against the screen frame via a hinge bolt penetrating a compression coil spring, and a forward path is formed on the front side of the opening to bypass flowing water passing through the opening. .

[0012]

In the dust removing device of the present invention, when the dust covers the entire surface of the mesh type screen due to the rapid increase of the dust to cause a water flow failure, the movable lids arranged on both sides of the screen frame are spring-loaded. The pressing force of the running water pushes open against it, and the running water passes through the detour. At this time, the dust that has already been collected by the mesh screen is difficult to pass through the detour provided on the front side of the opening, and only the running water passes through the opening, so the loss of the dust downstream at the time of abnormality is very small. When the inflow of dust decreases and the pressing force of the flowing water decreases, the movable lid seals the opening again by the spring force and returns to the normal operating condition.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 3 show an embodiment according to the present invention, FIG. 1 is a vertical cross-sectional view of a screen frame, FIG. 2 is a cross-sectional plan view of the screen frame, and FIG. It is a figure. In the figure, the screen frame 40 is an upper frame 42.
And a quadrilateral shape formed from a lower frame 44 having a bucket 44a and a pair of left and right side plates 43, 43,
A rectangular opening 45 is provided in the center of the back surface and a mesh screen 51 is attached. Longitudinal openings 46 are provided on both sides of the screen frame 40. One end of each opening 46 is pin-joined with a hinge 47, and the other end is a fork end 53.
A movable lid 50 having a hinge bolt 54 that is pin-joined to is arranged, and the hinge bolt 54 penetrates the compression coil spring 61 and has its tip screwed to the nut 55. Therefore,
The opening 46 is normally covered with the movable lid 50 and is in a sealed state. The urging force with which the movable lid 50 seals the opening 46 is controlled by the compression margin of the compression coil spring 61, and is adjusted by the screwing amount of the nut 55.

On the other hand, on the front side of the opening 46, as shown in FIG. 2, a vertical flat plate and the flat plate are wrapped so that the running water passing through the opening 46 does not flow linearly like the flow direction of the water channel. A detour (labyrinth) 48 composed of a vertical substantially L-shaped bent plate is formed, and the running water that has proceeded in the direction of the waterway is once inverted and then flows downstream.

The operation of the screen frame 40 provided with the movable lid 50 constructed as described above will be explained. Under normal operating conditions or when there is almost no water level difference, running water passes through the mesh screen 51 like the flow A. The dust that accompanies the flowing water is collected by this, and is then collected after turning over the upper sprocket. On the other hand, the amount of dust suddenly increases and the water level difference before and after the device exceeds 1000 mm,
In a so-called abnormal condition, dust covers the entire surface of the net-type screen 51, making it difficult for the running water to flow downstream of the water channel. Therefore, horizontal pressing force of the running water is applied to the screen frame 40. As a result, the movable lid 50 receives a large pressing force on the downstream side and opens to the downstream side centering on the hinge 47, so that the running water flows downstream like the flow B from the gap formed between the opening 47 and the movable lid 50. Flowing. In this case, a part of the dust already collected by the mesh screen 51 tries to move to the downstream side of the opening 46 along with the flowing water, but is blocked by the labyrinth 48 provided on the front side of the opening 46 to the downstream side. Is prevented from escaping. Therefore, it is possible to minimize the amount of dust that has been lost during an abnormality. When the amount of dust decreases and the water level difference between the front and the rear of the device decreases, the pressing force of the flowing water decreases, and the restoring force of the compression coil spring 61 is improved, so that the movable lid 50 is returned to the original closed state.

As described above, in the screen frame 40 having the movable lid 50, even if a large amount of dust flows in temporarily during operation and the dust covers the entire surface of the net-type screen 51 to cause a water flow failure. The movable lid 50 moves rearward to form a gap, which allows running water to pass therethrough, thereby reducing water flow obstacles. Therefore, the water level difference between the front and the rear of the device does not increase extremely and the device is operated safely, so that damage to the device is prevented. In addition, the flow of dust to the downstream at the time of abnormality is relatively small.

[0017]

As described above, in the dust removing device of the present invention, even if a water flow failure occurs due to a sudden increase in dust, the movable lid is automatically moved rearward to secure a passage for running water. Therefore, the increase in the water level difference is suppressed, the equipment is prevented from being damaged, and the continuous stable operation is ensured. Further, it is possible to minimize the loss of dust caused by the passage of running water.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a screen frame of a dust remover according to an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of a screen frame of the dust removing device according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part taken along line XX of FIG.

FIG. 4 is an overall vertical sectional view of a conventional dust removing device.

FIG. 5 is a vertical cross-sectional view of a screen frame of a conventional dust removing device.

FIG. 6 is a front view of a screen frame of a conventional dust removing device.

[Explanation of symbols]

 1 Upper sprocket wheel 2 Lower sprocket wheel 3 Link chain 3a Link chain 3b Roller 4 Screen frame 5 Power unit 6 Transmission chain 7 Chain wheel 8 Upper sprocket wheel shaft 9 Guide plate 10 Trough 14 Screen body 15 Upper beam 16 Mounting plate 16a Bolt Nut 17 Lower beam 18 Mounting plate 19 Side plate 20 Bolt nut 21 Dust bucket 40 Screen frame 42 Upper frame 43 Side plate 44 Lower frame 44a Bucket 45 Opening 46 Opening 47 Hinge 50 Movable lid 51 Net screen 53 Fork end 54 Hinge bolt 55 Nut 60 Protective tube 61 Compression coil spring L Direction of movement of link chain F Flow direction of flowing water A Flow of flowing water (normal time) B Flowing water (at abnormal time)

Claims (1)

[Claims] 1. A dust remover in which a screen frame provided with a net screen for collecting dust is joined to an endless link chain, and the link chain is driven through a pair of upper and lower sprocket wheels. Longitudinal openings are provided on both sides, and a movable lid that covers the opening is provided on the rear side of the opening. One end of the movable lid is pin-joined through a hinge and the other end penetrates a compression coil spring. The dust removing device which presses against the screen frame via the hinged bolt and forms a forward path on the front side of the opening for bypassing the flowing water passing through the opening.