JPH03257211A - Dust removing device - Google Patents

Abstract

PURPOSE:To improve the safety of a dust removing device by providing the outside of an opening provided on the upper horizontal member of a screen frame with a rotatable flapper which covers the opening and has a weight attached at its one end and a hinge attached at its other end. CONSTITUTION:When link chains 3x, 3y are driven, dust in flowing water abuts against a screen body 14 to be checked from drifting. When a screen frame 4 surfaces above the surface of water, the dust is accommodated in the bucket 17a of a lower beam 17. When a large quantity of dust flows into a dust removing device at a time water pressure acting onto a flapper 40 on the upper face of an upper beam 15 overcomes the gravity of a weight 40b to increase the pressure of water current, and the flapper 40 is thereby rotated upward centering around a hinge 40. In addition to that, the dust is caught by a bar-line 50 provided on the inside face of an opening 30 to ascend with the frame 4, and reversed by an upper sprocket to be discharged outside the device.

Description

[Detailed Description of the Invention] [Industrial Application Field J] The present invention relates to a molar removal device for removing dust from seawater or river water, and particularly relates to an improvement in the structure for dealing with emergencies (when a large amount of dust is generated). .

[Prior Art] Conventionally, commonly used dust removal devices have been widely used in industrial water canals or waterways for taking cooling water in power plants, etc., and the most well-known type is A link chain is provided on both sides, and a screen made of a bar screen or wire mesh is installed perpendicularly or almost perpendicularly to the flow direction for each link of the link chain, and by rotating this, the debris caught on the screen can be removed. There is a system that removes water outside the waterway.

3 and 4 show one embodiment of a conventional dust removal device, FIG. 3 is an overall schematic diagram, and FIG. 4 is a detailed vertical cross-sectional view (a) and a front view (b) of a screen frame having a bucket portion. ).

In FIG. 3, 1 is the upper sprocket foil, 2 is the lower sprocket foil, and 3 is both sprocket foils 1.
2 is a link chain mounted in an endless manner; 4 is a screen frame attached to the link chain 3 and has a packet part for storing captured garbage at the bottom; 5 is a transmission chain 6 and a chain wheel 7;
8 is a shaft of the upper sprocket wheel 1, 9 is a guide plate that guides the dust to the trough 10, 11 is a housing of the dust removal device, 12 is a flow channel, The arrow F indicates the direction of flowing water.The screen frame 4 is attached to each pitch of the link chain 3 as shown in Fig. 4, and 14 is the screen body, which is made of wire mesh or a large number of bars arranged in a spade shape. This is a member that prevents and scoops up dirt and debris in flowing water.

Reference numeral 15 denotes an upper beam provided at the upper end of the screen main body 14. This upper beam 15 is made of a pipe (or steel plate) having a suitable diameter depending on the width of the waterway, and its center is located at the roller 3b of the link chain 3. a mounting plate 16 located at the center of the section and protruding from the bottom of the mounting plate 16;
The screen main body 14 is integrally fixed through. Reference numeral 17 denotes a lower beam having a U-shaped cross section and provided at the lower end of the screen main body 14, and this lower beam 17 rotatably covers the upper part of the upper beam 15 of the screen frame 4 adjacent to the lower part of the lower beam 17. The screen main body 14 is integrally fixed via a mounting plate 18 that is provided and protrudes from the top of the mounting plate 18 . Reference numeral 19 denotes a side plate that holds the screen body 14 from its side, and this side plate 19 has a width wider than the link width of the link chain 3, as shown in FIG. They are integrally fixed to the left and right end faces, respectively. In other words, the frame body (screen frame 4
) is formed. This frame body is fixed to the link chain 3 by fixing its side plate 19 to the side surface of the link 3a with bolts and nuts 20. Reference numeral 21 denotes a garbage packet protruding from the lower beam 17. The garbage packet 21 is provided so as to diagonally cover the front lower part of the screen body 14, and its left and right ends are connected to the side plate 19 via the support plate 22. is integrally fixed to. Note that 23 is a spray pipe installed at the back of the screen frame 4 that is descending, and is used to remove dust adhering to the screen body 14 by spraying water onto the back of the screen frame 4 as shown by the chain line. It is something. therefore,
Dust floating in the flow is first blocked by the screen body 14, and as the link chain 3 rises,
The garbage packet 21, which is scooped up by the garbage packet 21 and contains the garbage, further rises, becomes horizontal at the top of the upper sprocket 1, and then turns around and descends.

Then, the garbage existing in the garbage packet 21 falls due to its gravity, is guided by the outer surface of the garbage bucket 21 of the lower screen and the guide plate 9, and is discharged into the waterway 10. On the other hand, the dust and the like adhering to the screen body 14 are separated by the spray water and are discharged into the trough IO via the outer surface of the dust packet 21 of the lower screen and the guide plate 9, as described above.

As shown in FIG.
It was driven by the upper sprocket wheel 1 of the teeth.

Note that the L arrow indicates the link chain driving direction.

[Problem to be solved by the invention] In recent years, as the amount of water intake has increased, the width of the waterways has become wider, and there has been a tendency for the amount of debris floating in the waterways to increase.
When a large amount of dust such as water matrix floods in, it exceeds the processing capacity of the installed dust removal equipment, and the dust cannot be processed completely, and the water passage part of the mesh frame or bar frame gradually becomes blocked. This made it impossible to ensure sufficient water flow, leading to a situation where the difference in water level before and after the dust removal equipment rose rapidly.

For this reason, if the water level difference before and after the dust removal equipment exceeds a certain value, the water pressure applied to the mesh frame or bar frame will become excessive and cause structural damage to the equipment, so it is unavoidable to limit the amount of water taken into the factory. Measures were taken such as:

However, if such a situation occurs during the electricity demand period,
At the power plant, the supply of electricity could not keep up with the demand for electricity, resulting in a power outage, which was a serious emergency for the public.

[Means for Solving the Problems] The m removal device of the present invention solves the above-mentioned problems and can be used when a large amount of dust such as water matrix temporarily flows in (hereinafter referred to as "emergency").
In order to eliminate the abnormal water level difference between the front and rear caused by the overload of the dust removal device, a screen frame equipped with a screen for dust collection is diagonally joined to an endless link chain, and the link chain is connected to a pair of upper and lower sprocket foils. The dust removing device is driven through a screen frame, the upper horizontal member of the screen frame has a flat shape, an opening is provided in the upper horizontal member, the opening is covered on the outside of the opening, and a weight is provided at one end. It has a structure in which a rotatable flapper is attached and a hinge is attached to the other end, and a lattice-shaped bar array is fixed to the inner surface of the opening.

[Function] In the dust removal device of the present invention, during normal operation, the dust is collected by the screen stretched over almost the entire inner surface of the screen frame, and the dust is discharged when the screen is turned over using the upper sprocket as in the conventional machine. . On the other hand, in an emergency when a large amount of dust is generated, a large amount of dust covers the screen during operation, and the water level difference before and after the dust removal equipment increases significantly.
A flapper sealed by a weight on the outside of the opening in the flat plate of the upper horizontal member of the screen frame is pushed open by water pressure, and water flows through this opening 30. At this time, relatively large debris contained in the water stream is suppressed and collected by a grid-like bar row arranged on the inner surface of the opening.

At the time of reversal, not only the screen portion but also the dust collected on the bar rows of the openings are discharged.

In this way, even in an emergency, it is possible to allow the upstream water to flow downstream via the opening, so the difference in water level before and after the dust removal device is relatively small, and there is no need to apply excessive force to each part of the device. It is possible to continue driving safely with less friction.

[Example" Examples of the present invention will be described in detail below.

1 to 2 show an embodiment of the dust removal device according to the present invention, in which FIG. 1(a) is an overall front view, FIG. 1(b) is an overall side view, and FIG. 2 is a partially enlarged side sectional view. It is a diagram.

In FIGS. 1 and 2, the screen frame 4 is composed of a flat plate, and four members are connected to each other: an upper beam 15 and a lower beam 17 bent in a 4-shape at the ends, and side plates 19, 19 at both left and right ends. It consists of a screen body (net) 14
are attached to the upper beam 15 and the lower beam 17 by the mounting plates 16 and 18, respectively, with bolts and nuts 16a and 18a (as shown in Figure 2), and the ends of the side plates 19 are shaped into a figure 5 shape at both ends. A screen frame configured as 0 or more, which may be bent and protruded and the screen body may be attached, is attached to the link chain 3y with mounting holes on both the left and right sides via the side plate 19 so that the plane of the upper beam 15 is inclined downwardly inward. and tighten with bolts and nuts. The maximum length of the screen frame in the vertical direction is approximately twice the link chain pitch, and the size of the screen frame is determined so that the gap between adjacent screen frames in the vertical direction is approximately 10 mm, as shown in Figure 1 (b). determine the If this gap is too large, some of the dust in the flowing water will not be able to be collected.
If the size is too small, there will be contact interference between adjacent screen frames as they rotate with the sprocket wheels.Both the upper beam 15 and the lower beam 17 can be press-formed from lightweight section steel, but especially the lower beam 1
The diagonal projecting part 7 on the side facing the running water forms a packet part 17a that serves as a storage place for the collected garbage.
Leave it a certain length as shown in the figure.

On the other hand, an opening 30 extending horizontally and longitudinally is provided near the screen 14 of the upper beam 15 described above, and at one end near the screen on the outside (upper side) of this opening 30 is a way 40b.
A flapper 40 in the shape of a flat plate is rotatably attached to the other end near the center via a hinge 40a, and covers the opening 30.

Further, on the inner surface of the opening 30, a lattice-shaped bar row 50 made of equally spaced round bars is arranged so as to cover the entire surface of the opening 30.

The operation of the dust removal device of the present invention configured as above will be explained.

When the dust removal device of the present invention is installed at a water intake that takes in seawater or river water in the state shown in FIG. When the screen frame 4 floats up from the water, the garbage is stored in the packet portion 17a of the lower beam 17 by its own gravity. after that,
The upper sprocket l is meshed and rotated, and the dust accumulated in the bucket part 17a of the lower beam 17 of the screen frame 4 which is turned upside down slides on the guide plate 9 and is discharged to a predetermined trough lO and collected. In the above operation, when the dust inflow is sufficient for the initial processing capacity of the dust removal device, the flapper 40 remains closed and the dust is collected by the screen 14, and sometimes there is a large amount of dust inflow. Sometimes, the entire surface of the screen body 14 is densely covered with dust, which obstructs the normal flow of water. As a result, the pressure of the water flow increases, pushing open the flapper 40 and causing the water flow to flow downstream from there. In this case, in order to prevent the dust accompanying this water flow from escaping downstream, there is a bar row 50 on the inner surface of the opening 30 along the flow direction, where the dust is collected and retained in the screen frame 4. It rises together with the screen frame 4 and is turned over by the upper sprocket 1, and is then discharged to the outside of the machine together with the dust collected by the screen frame 14.

At the time of reversal, the flapper 40 hangs down at the center of the hinge 40a as shown in FIG. 1(b) due to the weight of the way 40b, but when returning to normal rotation, it is pushed by the screen 14 of the subsequent screen frame 4, and as shown in FIG. Return to normal closed state.

In this manner, in the case of an emergency, the flapper 40 of the opening 30 can be automatically opened to maintain a smooth flow of water.

In the present invention, the opening 30 is a rectangular opening extending over almost the entire length in the horizontal longitudinal direction, but the opening may be provided intermittently.
The size of 0b can be appropriately selected in consideration of the rising speed of the screen frame 4, the water level difference in the conventional machine at the location of use, etc.

[Effects of the Invention] In the present invention, since the upper beam of the screen frame is provided with an opening and a flapper, the opening can be opened even in the event of an emergency, when a large amount of dust in flowing water temporarily increases. Since this can be handled by flowing water as a bypass, it is possible to keep the water level difference before and after the dust removal device as small as possible. Therefore, the load on each component of the dust removal device can be reduced, and damage to the device can be prevented, improving safety. In addition, since the minimum amount of water required can be ensured even in an emergency, continuous stable operation is possible, increasing the reliability of use of the device, and improving the maintenance and operability of the device.

[Brief explanation of drawings]

1 to 2 show an embodiment of the dust removal device according to the present invention, in which FIG. 1(a) is an overall front view, FIG. 1(b) is an overall side view, and FIG. 2 is a partially enlarged side sectional view. It is a diagram. Figures 3 and 4 show a conventional dust removal device, with Figure 3 being a schematic overall side sectional view, Figure 4(a) being a detailed longitudinal sectional view of the screen frame, and Figure 4(b) being a front view. be. 1... Upper sprocket foil, 2...
・Lower sprocket wheel, 3.3x, 3y...link chain, 3a...link chain, 3b・
...Roller, 4...Screen frame, 5.
...Power device, 6...Transmission chino,
7... Chain wheel. 8... Upper sprocket wheel shaft, 9...
... Guide plate, 10 ... Trough, 4.
... Screen body, 5 ... Upper beam, 16 ... Mounting plate, 7 ... Lower beam, 18 ...
...Mounting plate, 9...Side plate, 0...Bolt nut, 30...Opening, 0...Flapper, 40a...Hinge, 40b...・Weight 50...Par

Claims (1)

[Claims] (1) A dust removal device in which a screen frame equipped with a screen for collecting dust is diagonally joined to an endless link chain, and the link chain is driven via a pair of upper and lower sprocket wheels, the screen frame being The upper horizontal member is formed as a flat surface, an opening is provided in the upper horizontal member, the opening is covered on the outside of the opening, and a rotatable flapper is provided with a weight attached to one end and a hinge attached to the other end. What is claimed is: 1. A dust removal device comprising: a lattice-like bar row fixedly provided on the inner surface of the opening.