JPH03257212A - Dust removing device - Google Patents

Abstract

PURPOSE:To improve the safty of a dust removing device by providing the outside of an opening provided on an upper horizontal member with a rotatable flapper for covering the opening and a flapper closedly-holding means, and arrangedly providing a grid-shaped bar-line on the inside face of the opening. CONSTITUTION:When link chains 3x, 3y are driven, dust in flowing water abuts against a screen body 14, and when a screen frame 4 surfaces above the surface of water, the dust is accommodated in a bucket 17a. When the duct flows into a dust removing device at the rate within its processing capacity, the flapper 40 is kept in a closed state by a clamp 42. When a large quantity of dust temporarily flows into the device, the pressure of water current increases so much as to overcome water pressure acting onto the flapper 40 and the gravity of a weight 40b to rotate the flapper 40 upward centering a hinge 40a. The dust is then 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] The present invention relates to a dust 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 are widely used in industrial water channels or water channels for taking in cooling water in power plants, etc., and the most well-known ones include: A link chain is provided on both sides of the waterway, and a par screen or a screen made of wire mesh is installed perpendicularly or almost perpendicularly to the flow direction for each link of the link chain, and the water is caught on the screen by rotating the link chain. There are structures that remove dust from 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 link chain 3 and has a bucket portion for storing captured dirt at the bottom; 5 is a transmission chain 76 and a chain wheel 7 that connect the upper sprocket wheel to the upper sprocket wheel; 8 is an upper sprocket, the shaft of the foil 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, and the arrow F indicates the direction of the flowing water. show. As shown in Fig. 4, the screen frame 4 is attached to each pitch of the link chain 3, and 14 is the screen body, which is made of a wire mesh or a large number of bars arranged in the shape of a spade, and is designed to remove dust, etc. from flowing water. This is a member that prevents this and also scoops it up. 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.
The screen main body 14 is integrally fixed via a mounting plate 16 that is located at the center of the screen and protrudes from the bottom of the mounting plate 16. 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 . 19 is a side plate that holds the screen main body 14 from its side;
9 has a width wider than the link width of the link chain 3, as shown in FIG. 4(&), and is integrally fixed to the left and right end surfaces of the upper beam 15 and the lower beam 17, respectively.

In other words, the side plate 19, the upper beam 15, and the lower beam 17 form a frame (screen frame 4) that holds the screen body 14. The side plate 19 of this frame body is connected to the link 3 by means of bolts and nuts 20.
It is fixed to the link chain 3 by fixing it to the side surface of a. Reference numeral 21 denotes a garbage packet protruding from the lower beam 17, and this garbage bucket 21
The left and right ends are integrally fixed to the side plate 19 via the support plate 22. 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, the garbage floating in the flow is first blocked by the screen body 14, and as the link chain 3 rises, it is scooped up by the garbage packet 21. The garbage packet 21 containing the garbage further rises, and the upper sprocket 1 It becomes horizontal at the top, 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 packet 21 of the lower screen and the guide plate 9, and is discharged into the waterway 10. On the other hand, the dust adhering to the screen body 14 is separated by the spray water and is discharged into the trough 10 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 dust removal device of the present invention solves the following five problems and is capable of temporarily removing dust when a large amount of dust such as water mother flows in (hereinafter referred to as "emergency J").
In order to eliminate the abnormal water level difference before and after the overload of the FJ removal device, a screen frame equipped with a screen for collecting dust is diagonally joined to an endless link chain, and the link chain is connected to a pair of upper and lower sprockets. A dust removal device driven through a foil, in which the upper horizontal member of the screen frame is formed of a flat plate, an opening is provided in the upper horizontal member, the opening is covered on the outside of the opening, and a weight is attached to one end. The opening is provided with a rotatable flapper having a hinge attached to the other end thereof, and means for holding the flapper closed, and a grid-like par row is arranged on the inner surface of the opening.

[Function] Exclusion of the present invention! ! ! During normal operation, the device collects dust using a screen stretched over almost the entire inner surface of the screen frame, and as with conventional machines, the upper sprocket discharges the dust when it is reversed. In the event of an emergency, a large amount of dust covers the screen during operation, greatly increasing the water level difference before and after the dust remover. The flapper is pushed open by water pressure and water flows through this opening o30. At this time, relatively large pieces of dust contained in the water stream are suppressed and collected by the grid-like par rows arranged on the inner surface of the opening.

At the time of one reversal, not only the screen portion but also the dust collected in the par rows of the openings are discharged.

In this way, even in an emergency, it is possible to allow 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 strain each part of the equipment. You can continue driving safely with less force applied.

[Example] Hereinafter, embodiments of the present invention will be described in detail.

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

In FIGS. 1 and 2, the screen frame 4 is composed of a flat plate, and the end portion is bent into a 5-shape with a -1 section beam 15.
The screen body (mesh) 14 is connected to the lower beam 17 and the side plates 19, 19 on both the left and right sides, and the screen body (mesh) 14 is clamped by the upper beam 15 and the lower beam 17, respectively, by the mounting plate 16 and the mounting plate 18. Porto nara) 16a, 18
a (as shown in Figure 2), or at both ends, the ends of the side plates 19 may be bent into an L-shape to protrude and the screen body may be attached. It is fastened to the link chain 3y, which has mounting holes on both the left and right sides, with bolts and nuts through the side plates 19 so that the planes of 15 are inclined downwardly inward. 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 made too wide, some of the dust in the flowing water will not be collected, and if it is made too small, the screen frames will rotate with the screen frame and the adjacent screen frames will come into contact with each other. Both the upper beam A 5 and the lower beam 17 can be used by processing lightweight section steel into a bush.
In particular, the diagonal ridged portion of the lower beam 17 on the side facing the flowing water forms a ridge 71 portion 17a that serves as a storage place for the collected debris, so it should be made somewhat longer as shown in Fig. 2(a). put.

On the other hand, an opening D30 extending in the horizontal and longitudinal direction is provided near the screen 14 of the upper beam 15 described above, and a way 40b is provided at one end near the screen on the outside (upper side) of this opening D30.
A flat flapper 40 is rotatably attached to the other end near the center via a hinge 40a, and covers the opening 30.

In addition, a second
As shown in Figure (c), the protruding strip 4 is made by curving a flat plate.
4 is fixedly installed, and on the other hand, a groove is provided in the center at a position facing the protrusion 44, and a pole 4 protrudes toward the groove.
0c and a cylinder 40b that houses the compression coil spring 40d.
A clamp 42 having a built-in clamp is disposed on the upper beam 15.

When the flapper 40 is in the closed state, a convex strip 44 having a semicircular tip is fitted between the pair of left and right poles 4Oc in the groove of the clamp 42 to maintain the closed state of the flapper 40. Therefore, the protrusion 44 and the clamp 42 function as means for holding the flapper 40 closed when in the locked state.In this embodiment, two clamps are used.

Further, on the inner surface of the opening 30, grid-like bar arrays 50 made of round bars are arranged at equal intervals so as to cover the entire surface of the opening 30.

Also, near the center of the outer surface of the flapper 40, as shown in FIG.
, As shown in (b), a push rod with an elastic body such as rubber attached to the tip is fixed at right angles to the outer surface.

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 bucket part 17a of the lower beam 17 by its own gravity. after that,
The upper sprocket 1 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 10 and collected. In the above-mentioned operation, when the initial processing capacity of the dust removal device is sufficient for the inflow of dust, the flapper 40 remains closed and the dust is collected by the screen 14, and when there is a large amount of dust flowing in from time to time, the flapper 40 remains closed and the dust is collected by the screen 14. Although the entire surface of the screen body 14 is densely covered with dust and obstructs the normal flow of water, it overcomes the water pressure applied to the flapper 40 on the upper surface of the upper beam 15 of the rising screen frame 4 and the gravity of the weight 40b. As a result of the increased pressure of the water stream, the flapper 40 is pushed open and the water stream flows 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. The screen n-4 rises together with the screen n-4, and after being reversed by the upper sprocket 1, it is discharged to the outside of the machine together with the dust collected by the screen 14.

The flapper 40 that opens in an emergency will have a weight of 40 per turn.
Due to the weight of the hinge 40a as shown in FIG.
In order to prevent this, the screen frame is raised as shown in Figure 1(b), and as it is reversed at the top, the angle between the upper beam of the screen frame and the screen frame directly above becomes α1. , α2. Focusing on the fact that it gradually decreases to α3, press the push rod 40c near the top.
When the tip of the flapper 40 is pushed by the screen body 14 directly above, the flapper 40, which was in the open state, returns to the closed state.

On the other hand, under normal conditions, the flapper 40 continues to ascend, reverse, and descend while maintaining its closed state even during reversal due to the engagement between the protrusion 44 serving as a closed holding means and the clamp 42, thereby ensuring safe operation.

In this manner, in the present invention, in an emergency, the seven flaps 40 of the opening 30 are 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.

In the present invention, the flapper is returned from the open state to the closed state using the action of the push rod of the screen frame in the previous embodiment, but this can also be done by fastening a tension spring between the flapper and the upper beam.

[Effects of the Invention] In the present invention, since the upper beam of the screen frame is provided with an opening, a flapper, and means for holding the flapper closed, it is possible to prevent the amount of dust contained in flowing water from temporarily increasing.
This opening can be used as a bypass to allow water to flow only in so-called emergencies, and in normal times the bypass can be closed again, so the difference in water level between the front and back of the dust removal device can be kept as small as possible. Therefore, the load on the components of the dust removal device can be reduced, and damage to the equipment can be prevented, improving safety.

In addition, since the necessary minimum water intake can be secured even in an emergency, continuous and stable operation is possible, which increases the reliability of use of the device, and improves the maintenance and operation of the device.

[Brief explanation of drawings]

1 to 2 show an embodiment of the dust removal device according to the present invention, FIG. 1(a) is an overall front view, FIG. 1(b) is an overall side view, and FIG. 2(a) is a partial view. Enlarged side sectional view, Fig. 2(b) is Fig. 2(a) (7) Plan view taken along line XX, Fig. 2(e)
2 is a partially enlarged side view taken along the Y-Y line in FIG. 2(b). Figures 3 and 4 show a conventional m 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. It is. 1...Top subroket/) foil, 2...
...Lower sprocket foil. 3.3x, 3y...Link chain, 3a...Link chain, 3b...Roller, 4
...Screen frame, 5...Power unit, 6...Transmission chaino, 7...
... Chain wheel, 8 ... Upper sprocket wheel shaft, 9 ... Guide plate, 10 ... Trough, 14 ... Screen body, 15 ... ...Top beam, 17...Bottom beam, 19...Side plate, 30...Opening, 40a...Hinge, 40C...Push rod, 42c... ··Pole. 16... Mounting plate, 18... Mounting plate, 20... Bolt nut, 40... Flapper, 40b... Weight. 42... Clamp, 42d... Compression coil spring, 44... Convex strip,
50... Bar Figure 1 (b)

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 A rotatable flapper in which the upper horizontal member is formed of a flat plate, an opening is provided in the upper horizontal member, the opening is covered on the outside of the opening, a weight is attached to one end, and a hinge is attached to the other end; A dust removal device comprising a means for holding the flapper closed, and a grid-like bar row arranged on the inner surface of the opening.