JPH03281813A - Dust remover - Google Patents

Abstract

PURPOSE:To reduce a load in each part and to promote safety by providing an opening, flapper and a closed holding means thereof to the upper beam of a screen frame, and making the opening as a bypass to flow running water when dust tentatively reaches a large quantity. CONSTITUTION:A screen frame 4 provided with a dust collecting screen 14 is joined aslant to an endless link chain 3, and a dust remover driving the link chain 3 through a pair of up and down sprocket wheels 1 and 2 is provided. After that, an opening 30, flapper 40 and closed holding means thereof are provided to the upper beam 15 of the screen frame 4. When dust contained in running water tentatively reaches a large quantity, the opening 3 is a bypass to flow the running water, and in the case of the normal time, it is closed again. According to the constitution, a difference in the water level rising between front and rear of the dust remover is reduced as much as possible, a load to every part of an equipment is reduced, and the damage to the equipment can be prevented.

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 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 are structures that remove 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 tin sprocket foil, 2 is the lower tin sprocket foil, and 3 is both the tin 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 section for storing captured dust at the bottom; 5 is a transmission chain connected to an upper sprocket wheel via a transmission chain 6 and a chain wheel 7; 8 is the axis of the upper sprocket wheel 1, 9 is a guide plate that guides the dust to the trough 10, 11 is the housing of the dust removal device, 12 is the flow channel, and the arrow F indicates the direction of the flowing water. 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 prevent dust, etc. in flowing water. This is a member that prevents this from occurring 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. established in
The screen main body 14 is integrally fixed via a mounting plate 18 projecting from the top thereof. Reference numeral 19 denotes a side plate that holds the screen main body 14 from its side, and this side plate 19
$4 has a width wider than the link width of the link chain 3 as shown in Figure (a), and has an upper beam 15 and a lower beam 1.
They are integrally fixed to the left and right end surfaces of 7, 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 F. This garbage packet 21 is provided so as to obliquely cover the lower front part of the screen body 14, and its left and right ends are connected to the side plate 19 via the support plate 22. It is fixed integrally. 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 the link chain 3
As the garbage bucket) 21 rises, the garbage packet 21 containing the garbage is scooped up by the garbage bucket) 21, further rises, becomes horizontal at the top of the upper sprocket), 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 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 top sprocket wheel l 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.
If a large amount of dust such as water matrix floods in, the processing capacity of the installed dust removal equipment will be overwhelmed, and the dust will not be able to be processed completely, and the water passage part of the mesh frame or bar frame will gradually become 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, in Poai, where this situation occurred 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 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 garbage equipment, 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 removal device is driven through a screen frame, 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 screen is attached to the lower end of the inner surface of the screen frame so as to be swingable around a horizontal axis, and the screen frame is attached to the lower end of the inner surface of the screen frame, and includes a rotatable flapper with a hinge attached to the other end and means for holding the flapper closed. A stopper for suppressing the swinging of the screen is provided at a position where the screen is approximately vertical when it is on the side.

[Function] In the dust removal device of the present invention, during normal operation, the screen is stretched almost entirely on the inner surface of the screen frame, and the screen is attached to the upper end of the inner surface of the screen frame so as to be able to swing freely around a horizontal axis. Similar to the conventional machine, the upper sub-route cage 7 discharges the garbage when it is turned over.

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 device increases significantly. The flapper, which was sealed by a weight, is pushed open by water pressure, and a stream of water passes through this opening. At this time, relatively large debris contained in the water stream is suppressed and collected by a lattice-like bar row arranged on the inner surface of the opening.

Relatively small debris that has passed through the opening is interposed between the rising screen frame on the upstream side of the waterway and the screen frame after inversion on the downstream side of the waterway, The water hangs down around the horizontal axis at the upper end and is in a nearly vertical state, creating a gap between the lower end of the rescreen and the lower end of the screen frame through which the water flow can pass, from which it is discharged and flows downstream into the waterway.

In this way, the dust collected on the rising screen frame is discharged when it is turned over, and at the same time, the dust that has passed through the opening is also discharged without being accumulated between the upstream and downstream sides of the dust removal device.

As mentioned above, 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 safely with little additional damage.

[Example] Hereinafter, one embodiment 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(L) 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, Figure 2(b) is Figure 2(a) (7) Plan view taken along line XX, Figure 2(c)
is a partially enlarged side view taken along the Y-Y line in FIG. 2(b).

Figures 1 to 25! In J, the screen frame 4 is composed of a flat plate, and the upper beam 15 is bent into an L shape at the end.
The screen body (mesh) 14 is constructed by connecting four members: a lower beam 178 and side plates 19, 19 at both left and right ends.
A stopper 14c made of a round bar extending horizontally on the inner surface of the side plate 19 is rotatably attached via a horizontal rotating shaft 14a pivotally supported by the side plate 19 (as shown in FIG. 2(a)). 14 is fixed in a position where it does not swing more than vertically when it is inverted.The screen frame configured as above is attached to a link chain with bubble sealing holes on both the left and right sides so that the plane of the upper beam 15 is inclined downwardly inward. 3y through the side plate 19 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 adjusted 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 bucket part 17a that serves as a storage place for the collected garbage.
As shown in Figure (a), the length is set to some extent.

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

Further, on the lower surface of the weight 40b of the flapper 40, as shown in FIG.
is fixedly installed, and on the other hand, a concave groove is provided in the center at a position facing the convex strip 44, and a pole 40 protrudes toward the concave groove.
A clamp 42 is disposed on the upper beam 15 and has a built-in cylinder 40b that accommodates a compression coil spring 40d and a compression coil spring 40d.

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 4Oe in the groove of the clamp 42, thereby maintaining the flapper 40 in the closed state. Therefore, when the protrusion 44 and the clamp 42 are in the engaged state, they act as means for holding the flapper 40 closed.This embodiment shows a case in which 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 engaged 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 large debris accompanying this water flow from escaping downstream, there is a row 50 along the flow direction on the inner surface of the opening 30, where the debris is collected and stored inside the screen frame 4. While staying there, it rises together with the screen frame 4, and after reversing at the upper block (1), the screen 1
It is discharged out of the machine along with the dust collected in step 4.

The flapper 40 that opens in an emergency will release the weight 40 when it is reversed.
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 gradual decrease from α3, push rod 40c near the top.
The flapper 40, which was in the open state, returns to the closed state when the tip of the flapper 40 is pushed by the screen main body 4 directly above it.

On the other hand, at normal times, the flapper 40 maintains the closed state even during reversal due to the engagement between the protrusion 44, which serves as a closed holding means, and the clamp 42, and continues in the -1-up, 9-inversion, and lower stages, ensuring safe operation. is ensured.

In this way 1. According to the present invention, in an emergency, the flapper 40 of the opening 30 is automatically opened to maintain a smooth flow of water waves.

In the present invention, the opening r130 is a rectangular opening extending over almost the entire length in the horizontal longitudinal direction.
It is also possible to provide intermittent openings. Also, the size of the weight 40b of the flapper 40 is determined by the rising speed of the screen frame 4.
It can be selected as appropriate, taking into consideration the water level difference in conventional models at the location of use.

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.

In addition, relatively small pieces of dust that enter between the upstream and downstream sides of the dust remover via the emergency opening are cooled out of the machine through the gap between the lower end of the screen 14 and the screen frame when the machine is turned over, and do not accumulate.

[Effects of the Invention] In the present invention, the upper beam of the screen frame is provided with an opening, a flapper, and a stage f for holding the flapper closed, so that the amount of dust contained in the flowing water becomes large at times. Bypass this opening only in case of emergency.
This can be done by closing this bypass again, so the difference in water level before and after the dust remover can be kept as small as possible.Therefore, it is possible to keep the water level difference between the front and rear of the dust remover as small as possible. The added load can be reduced.

Safety is improved because damage to equipment can be prevented. In addition, when the screen frame is turned over, a gap is created between the screen and the screen frame, and the dust that enters through the opening is easily discharged outside the machine (downstream), so no dust remains inside the machine. Prevents equipment trouble. moreover,
Even in an emergency, the minimum amount of water required can be secured, allowing continuous stable operation, increasing the reliability of equipment use, and facilitating equipment maintenance and management.

Improves driving operability.

[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) c7) Plan view from X-X, Fig. 2(c)
is a partially enlarged side view taken along the Y-Y line in FIG. 2(b). 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. l...Top sprocket foil, 2...
・Lower sprocket wheel, 3.3x, 3y...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 brake 10...Trough, 14a...Horizontal rotating shaft, 14c...Stopper 17...Lower beam, 20...Bolt neck 30...Opening , 40a...Hinge, 40c...Push rod, 42c...Pole, 44...Protrusion, G. 40... Flapper 40b... Weight, 42... Clamp, 42d... Compression coil spring, 50... Bart 14... Screen body 14b. ... Bearing, 15 ... Upper beam 19 ... Side plate

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 means for holding the flapper closed is provided, and the screen is attached to the lower end of the inner surface of the screen frame so as to be swingable around a horizontal axis, and the screen is placed in a position where the screen is substantially vertical when the screen frame is on the downstream side of the waterway. A dust removal device equipped with a stopper that prevents the screen from swinging.