JPH03260210A - Dust removing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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).

[Conventional technology] Conventionally, in commonly used dust removal equipment.

It is widely used for industrial water canals or waterways for intake of cooling water in power plants, etc., and the most well-known example is a link chain on both sides of the waterway, and a bar for each link of this link chain. There is a structure in which a screen or a screen made of wire mesh is installed perpendicularly or almost perpendicularly to the flow direction, and by rotating the screen, debris caught on the screen is removed from the waterway.

Figures 3 and 4 show one embodiment of a conventional dust removal device, with Figure 3 being a schematic overall side sectional view, and Figure 4 being a detailed longitudinal sectional view (a) and front view of a screen frame having a bucket section. (b).

In FIG. 3, l 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 bucket section at the bottom for storing captured dust; 5 is an upper sprocket via a transmission chain 6 and a chain wheel 7; An electric motor transmits power to the boiler 1, 8 is the shaft 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, F arrow is the direction of the flow water, L indicates the link chain movement direction, screen frame 4 is 144
As shown in the figure, the screen body 14 is attached to each pitch of the link chain 3, and is made of a wire mesh or a large number of bars arranged in the shape of a spade, and prevents dirt and debris from flowing in the flowing water.

This is the member that 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 link chain 3.
The screen main body 14 is integrally fixed via a mounting plate 16 that is located at the center of the a-ra 3b portion and protrudes from the bottom thereof. 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 which is provided on the top of the mounting plate 18 and projects from the top thereof. 1
Reference numeral 9 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 1/S4 figure (a), and has an upper beam 15 and a lower beam 17. are integrally fixed to the left and right end faces of the 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. Then, this frame body has its side plate 19 fixed to a bolt nut 20.
It is fixed to the link chain 3 by fixing it to the side surface of the link 3a. Reference numeral 21 denotes a garbage bucket protruding from the lower beam 17. The 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. is integrally fixed to. Reference numeral 23 is a spray pipe installed on the back of the screen frame 4 located at the bottom, 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 and the like floating in the flow are first blocked by the screen body 14,
With the rise of link chain 3, garbage packet 21
The garbage packet 21 scooped up by the garbage container 21 further rises, becomes horizontal at the top of the upper block 1, and then turns over and falls next to it.

Then, the garbage existing in the garbage bag 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.

The endless link chain 3 that connects the screen frame 4 configured as described above is normal! $3 As shown in the figure, it was driven by an upper sprocket wheel 1 with approximately 6 teeth.

[Problem to be solved by the invention] In recent years, as the amount of water intake has increased, the width of waterways has become wider, and there has been a tendency for the amount of debris floating in 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, 1
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 before and after due to overload of the dust removal device, a pair of left and right φ upper and lower inner sprockets and outer sprockets are arranged in parallel in the direction of the rotation axis, and the rotation axis of the inner sprocket is aligned with the rotation axis of the outer sprocket. A ratchet that is concentrically supported on the outer periphery and allows rotation in only one direction is installed between the two rotating shafts, and an endless link chain is installed on each of the inner sprocket and the outer sprocket. An upper part of a side plate of a screen frame equipped with a collection screen is connected to a link chain mounted on the outer sprocket, and a long hole is provided in the lower part of the side plate along the vertical direction of the side plate. connecting a connecting rod penetrating through the inner sprocket to a link chain mounted on the inner sprocket;
A reversible electric motor for driving the rotating shaft of the outer sprocket is provided.

[Function] In the dust removal device of the present invention, during normal operation when there is relatively little inflow of dust, both the rotating shafts of the inner sprocket and the outer sprocket are driven simultaneously to maintain each screen frame at a constant angle close to a nearly vertical state. By continuing to operate the system, the screen frame collects dust in the flowing water.

On the other hand, in an emergency when a large amount of dust is generated, the electric motor, which had been rotating in the forward direction, is temporarily stopped, rotated in reverse for a predetermined period of time, then stopped, and then restarted in the forward direction.

By doing this, the ratchets attached to both rotating shafts rotate idly by the required angle, and the other link chain moves backward with respect to the link chain connected to the connecting rod at the bottom of the side plate. Therefore, the connecting rod ascends through the elongated hole in the side plate, and the side plate, that is, the screen frame, gradually tilts from its conventional almost vertical position, and a gap is created between the screen frames. Thereafter, at the end of the reversal, the connecting rod stops rising and reaches near the top of the elongated hole. By continuing the forward rotation operation while maintaining this state, each screen frame tilted, creating a gap between each screen frame, and the entire surface of the screen frame was covered with dust, which obstructed the flow. The large water level difference between the upstream and downstream sides of the dust removing device is eliminated by the flowing water flowing through this gap.0 To return to normal operation, the original state is restored by the reverse operation as described above.

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

Figures 1 and 2 show one embodiment of the dust removal device of the present invention,
FIG. 1(a) is a partially enlarged longitudinal cross-sectional view, and FIG. 1(b) is a cross-sectional view taken along line XX in FIG. 1(a).

Figures 2(a) and 2(b) are schematic side views;
1ffl(a) shows the state during normal operation, FIG. 2(b) shows the state in an emergency, and FIG. 2(C) shows a partially enlarged side sectional view of the screen frame.

@ In Figures 1 to 2, the screen frame 4 is composed of a flat plate, and four members are connected: an upper beam 15 bent into an L-shape at the end, a lower beam 17, and side plates 19, 19 at both left and right ends. The screen body (net) 1
4 is a mounting plate 16 on the upper beam 15 and the lower beam 17, respectively.
16a and 18a (as shown in Figure 2 (C)), and also at both ends, the ends of the side plates 19 are bent into an L shape and protruded, and the screen body is attached. A screen frame configured as 0 or more is fastened to the link chains 3A on both the left and right sides with a poldner 2 toro 0 via side plates 19 so that the front of the upper beam 15 is inclined downwardly inward. Further, an elongated hole 19a is provided in the lower part of the side plate 19 in the vertical direction, through which the headed connecting rod 70 passes and is connected to the overhang of the link chain 3B. The maximum length of the screen frame in the vertical direction is approximately equal to the link chain pitch, and the size of the screen frame 4 is such that the gap between adjacent screen frames in the vertical direction is approximately 10 mm, as shown in Fig. 1(a). Determine. If this gap is made too large, some of the dust in the flowing water will not be collected, and if it is made too small, the sprocket wheel will rotate, causing contact interference between the adjacent screen frames, and the upper beam 15 and the lower beam. 17 can be used by pressing lightweight section steel, but in particular, the diagonal projecting part on the side facing the flowing water of the lower beam 17 is used as a bucket part 17 that serves as a storage place for collected garbage.
A is formed, so it is made long to some extent as shown in FIG. 2(C).

On the other hand, the upper sprocket foil l is the outer sprocket (IA) as shown in FIG. 1(a).

Rotating shaft 8A with IA installed on the left and right side is connected to bearing 13A on both sides.
, 13A, and a chain wheel 7. It is rotationally driven by an electric motor 5 via a transmission chino 6.

On the outer periphery of the rotating shaft 8A, there are outer sprockets on both sides.
2) IA, inner sprocket IB with the same pitch circle diameter as the outer sprocket in parallel with IA.

The rotating shaft 8B with the IB attached has a pair of left and right bearings 13B,
13B, and both rotating shafts 8A.

As shown in FIG. 1(b), the central space of 8B is provided with a ratchet 80 that has a roller 80b attached to its tip and can rotate around a bottle fulcrum 80a, and a ratchet 80 that can rotate around a bottle fulcrum 80a.
It is pressed against the inner circumferential surface of the outer rotating shaft 8B by a tension coil spring 80d attached to the tip. On the other hand, the rotating shaft 8
A protrusion 81 is provided on the inner circumference of B, and a movable protrusion 82 is provided on the inner circumference at a certain angle from the protrusion 81 so as to normally protrude toward the inner circumference due to the biasing force of a compression coil spring 84. be done. The movable protrusion 82 is designed to be able to slide on the inside of the rotary shaft 8B, and has a permanent magnet 82a on the back side.
An electromagnet 83a is disposed on the inner surface of the housing 83 that houses the compression coil spring 84 at a position facing the permanent magnet 82a. Electrical wiring for energizing the electromagnet passes through the through hole 90a and is connected to the outside via a rotor such as a slip ring attached to the shaft end.

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 Figure 2(a) and the electric motor is driven, the rotating shaft 8A, ratchet 80° rotating shaft 8B rotate at the same rotation speed , the link chains 3A, 3B rise or fall at a constant speed, and the dust in the flowing water comes into contact with the screen body 14 and is prevented from drifting.When the screen frame 4 rises from the water, the dust falls into the bucket of the lower beam 17 due to its own gravity. It is stored in the section 17a. After that, the upper sprocket l is engaged and rotated, and the lower beam 1 of the screen frame 4 is turned upside down.
The garbage accumulated in the bucket portion 17a of the bucket 17a slides on the guide plate 9, is discharged to a predetermined trough 10, and is collected. In the above operation, when the dust inflow is sufficient for the initial processing capacity of the dust removal device, the screen frame side plate 19
The connecting rod 70 penetrated through the elongated hole 19a is at the lowest point of the elongated hole, and at this time, each screen frame 4 is almost continuously connected as shown in FIG. 2(a), and the water flow flowing from upstream to downstream. Most of it passes through the screen frame.

On the other hand, when a large amount of dust flows in from time to time, the dust densely covers the entire surface of the screen body 14, obstructing the normal flow of water and creating a large water level difference between upstream and downstream; When the electric motor is stopped for a moment during operation and then rotated in the reverse direction, the ratchet 80 idles in the counterclockwise direction (the rotational power is not transmitted to the rotational shaft 8B, and the rotational shaft 8B remains stopped), and eventually climbs over the movable protrusion 82. At this point, the reverse rotation is stopped due to a timeout of a set time such as a timer. During this time, when the link chain 3B stops, the link chain 3A moves backward (descends on the upstream side of the waterway), so the connecting rod 70 in the elongated hole 19a shown in FIG. 2(c) rises from the lowest point. , as a result, each screen frame changes from the state shown in Figure 82(a) to the second
The screen is tilted to the state shown in FIG. 3(b), and a large gap is created between each screen frame.

After this state, when rotating forward (clockwise) again, both rotating shafts 8A and 8B rotate at the same number of rotations, so
Operation can be continued while maintaining this state.

In this manner, in the present invention, water flow can smoothly pass through the large gaps between the inclined screen frames 4 in an emergency. When the inflow of a large amount of dust is finished and the normal inflow state returns, the electromagnet 83a is energized to cause the movable protrusion 82 to sink into the rotating shaft 8B, and then the motor is rotated forward and after idling for a while. The ratchet 80 has a protrusion 81
The screen frame 4 is restored to its original state and operation is resumed.

[Effects of the Invention] In the dust removal device of the present invention, the dust removal device is connected to two types of link chains mounted on the parallel inner sprocket and the outer sprocket, and the relative position between the two link chains is changed. , the slope of each screen frame can be changed and the gap between screens can be increased.
This gap can be used as a bypass only in so-called emergencies, when a large amount of dust is temporarily present in the running water, and the bypass can be closed again during normal times. The difference in water level between the two can be kept 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. Also,
Even in an emergency, the minimum amount of water required can be ensured automatically and remotely, allowing continuous stable operation, increasing reliability in equipment use, and improving equipment maintenance and operability.

[Brief explanation of drawings]

Figures 1 and 2 show one embodiment of the dust removal device of the present invention,
Figure 1(a) is a partially enlarged vertical sectional view, Figure 1(b) is the first
Figure 2 (a) is a cross-sectional view taken along the line X-X in Figure (a), Figure 2 (a) and Figure 2 (b) are schematic side views, Figure 2 (&) is a state during normal operation, Figure 2 ( b) shows the emergency situation, Figure 2 (
C) shows a partially enlarged side sectional view of the screen frame, Figures 3 to 4 show an example of a conventional dust removal device, wS3 is an overall side sectional view, and Figure 4 (a) shows the screen frame. FIG. 4(b) is a front view. l...Top sprocket foil. IA...Outer sprocket, 1B...Inner sprocket, 2...Lower sprocket foil, 3.3A, 3
B...Link chain, 3a...Link chain, 3b...Roller, 4
...Screen frame, 5...Electric motor, 6...Transmission check 7, 7...
Chain wheel, 8... Upper sprocket wheel shaft, 8
A, 8B...rotating shaft, 9...guide plate, lO...trough, 2...flow channel, 3A, 13B...bearing, 4... ... Screen body, 5 ... Upper beam, 1 7 ... Lower beam, 1 9 ... Side plate, l O ... Bolt nut, 6 0. ...Connecting rod, 80a... Bin fulcrum, 80c... Overhanging rod. Od...Tension coil spring l...Protrusion, 2a...Permanent magnet, 82...Movable protrusion, 6...Mounting plate, 8... mounting plate. 9a...Elongated hole, 0...Bolt nut, 0...Ratchet, Ob...Roller, 83...Housing, 83a...Electromagnet, 84... ...Compression coil spring, 90...Rotor, 90a...Through hole.

Claims (1)

[Claims] (1) A pair of left and right, upper and lower inner sprockets and outer sprockets are arranged in parallel in the direction of the rotation axis, and the rotation axis of the inner sprocket is supported concentrically around the outer periphery of the rotation axis of the outer sprocket, allowing rotation in only one direction. A ratchet is installed between the two rotating shafts, an endless link chain is installed on each of the inner sprocket and the outer sprocket, and the upper part 1 of the side plate of the screen frame is equipped with a screen for collecting dust. A point is connected to a link chain mounted on the outer sprocket, an elongated hole is provided in the lower part of the side plate along the vertical direction of the side plate, and a connecting rod passing through the elongated hole is connected to the link chain mounted on the inner sprocket. A dust removal device that is connected to a chain and provided with a reversible electric motor for driving the rotating shaft of the outer sprocket.