JPH0414508A - Dust removing device - Google Patents

Abstract

PURPOSE:To increase the processing capacity of a dust removing device so as to reduce the water level difference between the upstream and downstream sides of the device to a very small by arranging an oblique bar row which retreats to the downstream side on the upstream side face of the device in the vertical direction and stretching a screen which is driven by means of an adjustable-speed motor on the downstream side face. CONSTITUTION:When this dust removing device is moved by driving link chains 3X and 3Y by means of a driving device, dust usually collides with a screen main body 14 after passing through bars 50 and stops flowing. Such dust is collected in the basket section 17a of a lower beam 17 and the basket section 17a is lifted up and overturned after passing around a sprocket 1. Therefore, the dust collected in the section 17a is emptied onto a guide plate 9 and gets into a trough 10 after sliding down the plate 9. Moreover, when a large quantity of dust flows into the basket 17a at once, the dust closely gathers on the upstream side of the screen main body 14 and the water level difference between the upstream and downstream sides of the device increases. When the level difference increases, the rotating speed of a motor is increased beyond a set value and the rising speed of a frame body 4 is increased so as to increase the processing capacity. Therefore, the water level difference can be eliminated by means of an overload and the device can be operated continuously in a safe state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a 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.

Figures 3 and 4 show one embodiment of a conventional dust removal device, with Figure 3 being an overall schematic diagram, and Figure 4 being a detailed vertical sectional view (a) and a front view (b) of a frame body 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.
2 is a link chain mounted in an endless manner; 4 is a frame body attached to the link chain 3 and has a bucket section for storing captured garbage in the lower part; 5 is an upper sprocket wheel via a transmission chain 6 and a chain wheel 7; 1 is a power device that transmits power, 8 is the shaft of the upper sprocket wheel 1, 9 is a trough 10
11 is a housing of the dust removal device, 12 is a flow channel, and arrow F indicates the direction of the flowing water. Frame 4
As shown in Fig. 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 and other particles from flowing in the flowing water. , is the member that scoops up this.

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 side plate 19, the upper beam 15, and the lower beam 17 form the frame 4 that holds the screen body 14. This frame body 4 has its side plate 19 fixed to the bolt nut 2.
It is fixed to the link chain 3 by fixing it to the side surface of the link 3a by the bolt 0. 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 on the back of the 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 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 packet 21 rises, the garbage packet 21 scooped up by the garbage packet 21 and containing 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 packet 21 of the lower screen and the guide plate 9, and is discharged into the trough 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 arrow indicates the direction in which the link chain is driven.

[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 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 the dust removal device due to overload, a dust collection frame is connected to an endless link chain, and the link chain is driven through a pair of upper and lower sprocket wheels. In the device, a diagonal row of bars that recede toward the downstream side as it goes downwards is arranged vertically on the front surface of the upstream side of the waterway, and a screen is stretched over the entire downstream side of the waterway, and a sprocket drive The electric motor is a variable speed electric motor, and a control device is provided to control the rotation speed of the variable speed electric motor according to the degree of the water level difference before and after the dust removal device.

[Function] In the dust removal device of the present invention, during normal operation, the dust that passes through the row of bars on the front side of the frame is collected by a screen stretched almost entirely on the inner surface of the rear side of the frame. In the same way as above, the upper sprocket discharges dust when it is reversed.

On the other hand, in an emergency situation where a large amount of dust is generated, such as a water carrier, the water level difference before and after the dust remover will increase, and the control device will increase the rotation speed of the electric motor accordingly, increasing the lifting speed of the frame and removing the dust. Among them, relatively large water carriers, etc. come into contact with the row of bars on the front of the frame body, descend downwards (therefore, they descend along the bars that are slanted to the rear, and the relatively small ones that pass through the row of bars) Screen (mesh) on the back of the shape of the garbage only
Since the water is collected by

Therefore, even in an emergency, a large amount of inflowing dust can be treated, and the water level difference that occurs before and after the dust removal device becomes small, and the electric motor, which had been rotating at high speed, returns to its original rotational speed.

In this way, in the event of an emergency, the processing capacity is increased, and by roughly scraping the dust with the front row of bars, it is possible to allow the upstream water flow to flow downstream as appropriate, thereby reducing the amount of dust generated before and after the dust removal equipment. The water level difference can be kept relatively small, and the equipment can continue to operate safely with less force being applied to each part of the equipment.

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

1 and 2 show an embodiment of the dust removal device according to the present invention, in which FIG. 1(a) is a partially enlarged vertical sectional view, FIG. 1(b) is a partially enlarged front view, and FIG. ) is a partially enlarged vertical sectional view showing another embodiment, FIG. 2(a) is a control command system diagram, and FIG.
b) is a control block diagram.

In FIGS. 1 and 2, the frame body 4 is composed of a flat plate, with an upper beam 15 and a lower beam 1 bent into an L shape at the ends.
7 and side plates 19 and 19 on both left and right sides are connected to form a substantially rectangular shape, and on the rear side, the screen body (mesh) 14 is connected to the upper beam 15 and the lower beam 1.
7, the bolts and nuts 16a, 1 are clamped by the mounting plate 18, respectively.
8a (as shown in Figure 1(b)).

In addition, on the upstream side of the waterway of the frame 4, in FIG. 1(a), a support 50a and a side plate 1 are horizontally stretched over an overhang support 40 that is fixed and protrudes from the upper beam 15 at both ends.
A row of bars 50 are disposed at equal intervals in the width direction and are arranged downwardly (accordingly, receding and sloping in the direction of the flow of the waterway) and a support 50b stretched horizontally between both inner surfaces of the channel 9. Ru.

As another embodiment, the bar array 50 may be curved in an arcuate manner, as shown in FIG.

It goes without saying that an appropriate space should be left between the lower beam 15 and the support 50b so that the dust collected by the screen body 14 can be discharged when the screen body 14 is turned over.

In addition, a variable speed electric motor is used as the driving motor for the dust removal device, and as shown in Figure 2 (b), a water level difference sensor measures the water level difference between the front and rear floats installed before and after the dust removal device. The comparator 101 determines whether the water level has exceeded the value predetermined by the setter 102. When the water level exceeds this value, the electric motor is controlled via the control device 103 according to the excess water level difference. It is configured to increase or decrease the number of rotations.

The actual motor rotation speed control is set, for example, based on the control command shown in FIG. 2(a), so as to give an appropriate rotation speed according to the actual water level difference. Timer 10 in the diagram
4 is for setting the frequency of measuring the water level difference with the water level difference sensor, and is selected, for example, in the range of 1 min to 5 min at a time, and the measurement interval is shortened in places where there are rapid changes in the inflow of dust into the waterway.

The frame body 4 constructed as described above is fastened to the link chain 3y, which has mounting holes on both left and right sides, with bolts and nuts through the side plates 19 so that the plane of the upper beam 15 is inclined downwardly inward. The maximum length of the frame 4 in the vertical direction is approximately twice the link chain pitch, and the frame 4 is arranged so that the gap between adjacent screen frames in the vertical direction is approximately 10 mm, as shown in FIG. 1(a). determine the size of If this gap is too large, some of the dust in the flowing water will not be collected, and if it is too small, adjacent screen frames will come into contact with each other as they rotate with the sprocket wheels. Both the upper beam 15 and the lower beam 17 can be used by pressing lightweight section steel, but the diagonal overhang on the side facing the flowing water of the lower beam 17 is particularly useful as a storage place for collected garbage. Since the bucket portion 17a is formed as shown in FIG. 1(a), it is made long to some extent.

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. In addition, when small-sized garbage normally flows in, it passes through the bar 50 and comes into contact with the screen body 14 to prevent it from drifting, and when the frame 4 rises from the water, the garbage's own gravity causes it to flow into the bucket portion 17a of the lower beam 17. is stored in. Then, rotate the upper sprocket l to engage it,
Bucket portion 17 of lower beam 17 of frame body 4 upside down
The dust accumulated in a slides on the guide plate 9, is discharged to a predetermined trough 10, and is collected. The above operation is
When the dust inflow is sufficient for the initial processing capacity of the dust removal device, the rotational speed of the electric motor is relatively low, and the dust is collected by the screen 14; Dust densely covers the entire surface of the screen body 14, obstructing the normal flow of water, and increasing the water level difference before and after the dust removal device. When this water level difference exceeds a certain set value, the rotational speed of the electric motor increases as described above, the rate of rise of the frame 4 increases, and the processing capacity increases. In the present invention, a large amount of generated debris (for example, a large swarm of water bodies) comes into contact with a row of bars provided on the upstream side of the front surface of the screen main body 14 and whose lower part slopes toward the downstream side, and increases the speed of the rising frame. body 4
As a result of the operation, the bucket part 17a quickly moves downward along this inclined bar and is stored, while the water flow continues to pass along with the flow, so that small debris that cannot be captured by the bar array is collected in the same way as in normal times. Since the dust is collected on the screen 14 and stored in the bucket section, the increase in the water level difference between the upstream and downstream sides of the dust removing device can be kept low. thus,
- When the frame 4 passes through the upper sprocket 1 and is reversed, the dust collected by the bar row 50 and the screen 14 is removed.
It is discharged into the trough 10 together. The gaps between the bar rows will be selected taking into consideration the size of water bodies that may occur in an emergency.

[Effects of the Invention] In the present invention, in an emergency, the rising speed of the frame increases as the water level difference increases, and in addition to the screen on the frame, a row of bars is provided in front of the screen, so even in an emergency, a large amount of Not only can garbage be treated, but the water level difference before and after the dust removal device 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. In addition, since the minimum required water intake can be secured even in an emergency, continuous and stable operation is possible, increasing the reliability of equipment use, and improving equipment maintenance and operability.

[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 a partially enlarged vertical sectional view, FIG. 1(b) is a partially enlarged side view, and FIG. ) is a partially enlarged vertical sectional view showing another embodiment of the present invention, FIG. 2(a) is a control command system diagram,
FIG. 2(b) is a control block 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
... Frame body, 5 ... Power device, 6 ... Transmission chaino, 7 ...
・Chain wheel, 8... Upper sprocket wheel shaft,
9...Guide plate, 10...Trough, 14...Screen body, 15...Upper beam, 16...
Mounting plate, 17...Lower beam, 18...
...Mounting plate, 19...Side plate, 2
0... Bolt nut, 40... Overhang support, 50... Bar row (bar), 50b... Support, 101... Setting device, 103... Control Device,

Claims (1)

[Claims] (1) In a dust removal device in which a frame for collecting dust is joined to an endless link chain, and the link chain is driven via a pair of upper and lower sprocket wheels, the link chain moves downward to the front surface on the upstream side of the waterway. A diagonal row of bars that recede toward the downstream side is arranged vertically in accordance with the above, and a screen is stretched across the entire downstream side of the waterway, and the sprocket drive motor is a variable speed motor, and the water level difference before and after the dust removal device is A dust removal device equipped with a control device that controls the rotation speed of the variable speed electric motor depending on the degree of rotation.