Bar Screen Device

Abstract

To provide a bar screen device capable of continuously removing stuck dust at a downstream side of a bar screen.SOLUTION: In a bar screen device, a bar screen 7 is installed so as to cross a water intake passage in a width direction. The bar screen device comprises: a rake 5 moving to ascend along a face at an upstream side of the bar screen 7; a rotary brush 10 between horizontal beams 4 provided so as to vertically face each other with a constant interval at a downstream side of the bar screen 7; and a guide rail 9 for the rotary brush 10 to vertically move. The rotary brush 10 ascends to rotate by being in contact with a claw 8 of the rake moving to ascend.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a dust removal device which is installed for the purpose of removing foreign matter such as dust from water when taking water from a river or the sea. [Background technology]

[0002] In power plants such as thermal power plants, water is taken from rivers and the sea at intake sites set up to be used as cooling water, but this water may contain dust and aquatic organisms and cannot be used as is. For this reason, dust removal equipment is installed at the intake sites to capture dust and aquatic organisms in the water. Multiple dust removal devices are installed in the intake channel, starting from the upstream side with a screen to capture coarse dust, followed by a screen to capture fine dust, to efficiently remove dust.

[0003] A bar screen device, which is one type of dust removal equipment, is a structure in which a bar screen (a vertical grid of multiple flat bars arranged at equal intervals within a rectangular frame) is set upright across the intake channel, either perpendicular to the water flow direction or at a specified inclination angle, and the device removes any debris attached to the screen from the waterway.

[0004] To remove the debris from the bar screen, a bucket with a rake is provided, and the rake attached to a carrying chain rises along the bar screen, picking up the debris. At this time, shellfish and shellfish spores are also removed along with the debris.

[0005] However, while the above-mentioned method can remove the dust and shellfish that have adhered to the front surface (upstream side) of the bar screen, it is difficult to remove the dust and shellfish that have adhered to the back surface (downstream side) of the bar screen. As a result, highly reproductive shellfish attach to the underside of the bar screen and multiply, causing the screen to become clogged.

[0006] When this happens, the bucket with the rake comes into contact with the shellfish and, in the worst case scenario, the bucket with the rake may become deformed, so divers must dive into the water intake channel to remove the debris and shellfish, or the flow of water must be blocked with a waterstop gate to create a dry space without water and then the debris and shellfish can be removed, or even the bar screen must be pulled above ground to allow the removal work to be carried out. In addition, at this time, the shellfish attached to the bar screen give off an odor, so the removal work in a dry space creates a poor working environment.

[0007] All of these removal works are very time-consuming and will take a long time, so power plants such as thermal power plants that use cooling water from the intake channel will have to suspend operations during that time. If the operation of power plants is suspended during the summer when the power supply is high, the resulting power shortage will have a major impact on our lives.

[0008] Therefore, as disclosed in Patent Document 1, it has been proposed to provide a scraper on the downstream side of the bar screen that moves by utilizing the upward movement of a rake that scrapes up the dust adhering to the upstream side of the bar screen. This allows the scraper to scrape the downstream side of the bar screen and remove the dust adhering to the bar screen. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 5-17921 Summary of the Invention [Problem to be solved by the invention]

[0010] However, pieces of wood and other objects may be floating in the water taken from rivers or the sea. In such cases, the structure of Patent Document 1 has the risk of hard objects such as wood becoming caught between the bar screen and the scraper, causing the function of removing attached debris to cease. This would require divers to descend into the water intake channel to carry out the removal work, or to block the flow of water with a waterstop gate to create a dry space and carry out the removal work, which would mean the power plant would have to be shut down for an extended period of time.

[0011] Furthermore, with conventional techniques including Patent Document 1, it was impossible to remove debris that had adhered to the bar braces that support and secure the bar screen. Even in places other than the bar screen, if debris or shellfish adheres to the structural parts of the bar screen device that are submerged in the intake channel, it can affect the water flow area and reduce the amount of water intake.

[0012] The present invention has been made in consideration of the above-described problems, and has an object to provide a bar screen device capable of continuously removing adhering dust on the downstream side of the bar screen. [Means for solving the problem]

[0013] In order to solve the above problem, as a first means, a bar screen is installed across the intake channel in the width direction, A rake that moves upward along an upstream surface of the bar screen; A rotary brush is provided between two cross beams that are arranged at equal intervals and face each other vertically on the downstream side of the bar screen, and a guide rail for the rotary brush to move vertically is provided, The rotating brush includes a cylindrical tube having brush bristles formed radially thereon, the brush bristles being provided with a plurality of rubber members spaced at predetermined intervals in the longitudinal direction of the cylindrical tube, The rake's claws move upwards and The tip of the rubber material of the rotating brush The object of the present invention is to provide a bar screen device characterized in that the rotating brush rises and rotates upon contact with the surface of the bar.

[0014] According to the first means described above, the rotating brush moves upward while rotating on the downstream side of the bar screen due to the upward movement of the rake which scrapes off the debris adhering to the upstream side of the bar screen, so that the debris captured by the bar screen can be continuously removed and clogging can be prevented.

[0015] In order to solve the above problem, as a second means, the rotating brush has brush bristles formed radially on the entire outer circumferential surface of a cylindrical tube, The object of the present invention is to provide a bar screen device according to the first aspect, characterized in that the cylindrical tube has a hollow structure.

[0016] According to the second means described above, the rotating brush moves upward while rotating on the downstream side of the bar screen due to the upward movement of the rake which scrapes off the debris adhering to the upstream side of the bar screen, so that the bristles of the rotating brush continuously remove the debris captured by the bar screen and prevent clogging. In addition, by sealing air inside the hollow cylindrical tube that constitutes the rotating brush, the rotating brush can easily rise in the water, thereby reducing the power required for the rake's tines to come into contact with and raise the rotating brush.

[0017] In order to solve the above problems, as a third measure ,before The length of the rubber material is longer than the length of the brush bristles, The tip of the rubber material is curved toward the water flow direction. The object of the present invention is to provide a bar screen device.

[0018] According to the third means described above, the rotating brush moves upward while rotating on the downstream side of the bar screen due to the upward movement of the rake which scrapes off the debris adhering to the upstream side of the bar screen, so that the debris captured by the bar screen can be continuously removed and clogging can be prevented. In addition, the tip shape of the rubber material that makes up the rotating brush is curved toward the direction of the water flow, making it easier to rotate under the force of the water flow, and enabling the brush to efficiently remove dust adhering to the bar screen. Effect of the Invention

[0019] According to the present invention, dust adhering to the back surface of the bar screen can be continuously removed and cleaned, so clogging of the bar screen can be constantly prevented. Therefore, not only can sudden shutdowns of the power plant due to clogging of the bar screen be avoided, but the labor required for cleaning the bar screen is reduced and there is no need to suspend operation of the power plant. [Brief description of the drawings]

[0020] [Figure 1] 1A and 1B are partial cross-sectional side views of a bar screen device according to an embodiment of the present invention, in which (a) shows the state before the tines of a rake ascend, and (b) shows the state after the tines ascend. [Diagram 2] 1A to 1C are explanatory diagrams of a rotating brush of a bar screen device according to the present embodiment, in which (a) is a plan view, (b) is a perspective view, and (c) is a side view. [Diagram 3] FIG. 2 is a perspective view for explaining the positional relationship between a rotating brush and a guide rail of the bar screen device according to the present embodiment. [Figure 4] FIG. 1 is a simplified cross-sectional side view of a conventional bar screen device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bar screen device according to an embodiment of the present invention will be described with reference to the drawings.

[0022] [Conventional bar screen device 20] 4 shows a conventional bar screen device 20 in which the downstream side of the bar to which the bar screen 27 is fixed is connected by a cross beam 24, and as a carrying chain 26 that is endlessly wound around an upper sprocket 21A and a lower sprocket 21B rotates, a rake 25 rises and scrapes out the garbage captured by the bar screen 27. The scraped out garbage is lifted upward by the rake 25 and passes along a guide plate 23 inside the housing 22 to be disposed of in a trough 28.

[0023] However, since the rake 25 cannot protrude to the rear surface (downstream side) of the bar screen 27 to scrape off the debris, it is difficult to remove the debris and shellfish adhering to the downstream side of the bar screen 27. Therefore, there was a problem that clogging occurred when leftover garbage accumulated downstream of the bar screen 27 or when highly fertile shellfish proliferated. When the bar screen 27 became clogged, water could not pass through, causing a lack of flow rate, and it became impossible to secure sufficient cooling water. Furthermore, the rake 25 may come into contact with shellfish that have not been removed, and in the worst case scenario, the rake 25 may be deformed.

[0024] When this happens, divers dive into the intake channel or use a water stop gate to block the water flow and create a dry space to remove the rubbish and shellfish. In some cases, the bar screen 27 must be pulled above ground to perform the removal work. At this time, the shellfish attached to the bar screen 27 give off an odor, making the removal work in a dry space a poor working environment. Furthermore, all removal work is extremely time-consuming and takes a long time, during which time power plants that use cooling water from the intake channel will have to be shut down.

[0025] [Bar screen device according to an embodiment of the present invention] 1 is a partial side cross-sectional view of a bar screen device according to an embodiment of the present invention, in which the downstream sides of the bars that support and fix the bar screen 7 are connected by vertically opposed cross beams 4. A rotating brush 10 that moves along a guide rail 9 is provided between the cross beams 4. As the rake 5 rises, the tines 8 of the rake come into contact with the tip of the rubber material 2 of the rotating brush 10, causing the rotating brush 10 to rise and rotate.

[0026] Between the cross beams 4 facing each other vertically, a guide rail 9 is provided on which a rotating brush 10 can slide and move vertically. The number of rotating brushes 10 is preferably one or two. 1 is trapezoidal in shape with a lower base on the upstream side and an upper base on the downstream side when viewed from the side, and the two rotating brushes 10 pass through different paths when ascending and descending. Alternatively, the guide rail 9 may be shaped linearly so that the rotating brushes 10 pass through the same path when ascending and descending.

[0027] 1(b) shows the state after the rake 5 has moved from the positional relationship shown in FIG. 1(a) during its upward movement. In other words, as the tines 8 of the rake move upward, come into contact with the tip of the rubber material 2 of the rotating brush 10, the rotating brush 10 rises while rotating, and when it separates from the tines 8 of the rake, it descends while rotating along the guide rail 9.

[0028] [Rotary Brush 10] In the embodiment shown in FIG. 2, the rotating brush 10 has a cylindrical tube 13 at its center and an innumerable number of brush bristles 14 formed radially therefrom so as to cover the entire outer circumferential surface of the cylindrical tube 13 . The cylindrical tube 13 is preferably made of a lightweight metal such as stainless steel or fiber-reinforced plastic. The inside of the hollow cylindrical tube 13 is hollow and filled with air, so that when the tines of the rake come into contact with it, it easily rises in the water.

[0029] A plurality of rubber members 12, each longer than the brush bristles 14, are arranged at predetermined intervals in the longitudinal direction of the rotating brush 10. As shown in the plan view of the rotating brush 10 in Fig. 2(a), it is preferable to arrange two rubber members 12 at equal intervals in the middle of the longitudinal length of the cylindrical tube 13. It is also preferable that the rubber members 12 are made of flexible hard rubber.

[0030] 2(b) is a perspective view showing only a portion of the brush bristles 14 and rubber material 12 formed on the cylindrical tube 13. The rubber material 12 is disposed symmetrically with the cylindrical tube 13 as the axis of symmetry. 2(c), six rubber members 12 are arranged at predetermined intervals in a point-symmetric manner on the brush bristles 14 formed radially on the entire outer peripheral surface of the cylindrical tube 13. The number of rubber members 12 arranged is preferably 2 to 8, and more preferably 6. Furthermore, the tip of the rubber material 12 constituting the rotary brush 10 is curved in the direction of the water flow so as to be easily subjected to the force of the water flow.

[0031] 3 is a perspective view of the rotating brush 10 engaged with the guide rail 19. In this figure, the brush bristles 14 and the rubber material 12 of the rotating brush 10 are omitted. In the embodiment shown in Fig. 3, both ends of the cylindrical tube 13 constituting the rotating brush 10 are engaged with the guide rails 19, so both ends of the rotating brush 10 are prone to wear. Therefore, resin liners such as ultra-high molecular weight polyethylene are formed on both ends of the cylindrical tube 13 constituting the rotating brush 10 to improve sliding at the engagement parts. Furthermore, flanges 16 are provided to prevent the rotating brush 10 from tilting and getting caught when lifting and lowering, and to prevent both ends of the cylindrical tube 13 from coming off the guide rails 19.

[0032] In the embodiment of the present invention described above, as the rake 5 moves upward, the tines 8 of the rake come into contact with the tips of the rubber material 12 of the brush bristles 14 of the rotating brush 10, and a force is applied to raise and rotate the rotating brush 10. At this time, the cylindrical tube 13 constituting the rotating brush 10 has a structure having buoyancy so that it can easily float on water, so that the rotating brush 10 tends to rise due to the buoyancy. In addition, the tip shape of the rubber material 12 of the rotating brush 10 is curved in the direction of the water flow, so that it is easy to rotate by the force of the flowing water in the water intake channel. For these reasons, the lifting and rotation of the rotating brush 10 in this embodiment does not depend only on the power generated by the lifting movement of the rake 5, making it possible to perform energy-saving operation.

[0033] In the trapezoidal guide rail 9 shown in Figure 1, the rotating brush 10 moves to the top of the upstream guide rail 9 while rotating due to the rising rake 5. Then, the rake's tines 8 come off the tip of the brush and move from the trapezoidal leg part to the downstream guide rail 9, and the rotating brush 10 descends under its own weight while continuing to rotate.

[0034] In this way, the rotating brush 10 is constantly rotating while repeatedly moving up and down along the guide rail 9, so that even if there are pieces of wood or the like in the water taken from a river or the sea, they will not get caught between the bar screen 7 and the rotating brush 10, and the attached debris can be continuously removed. In addition, in the trapezoidal guide rail 9 of this embodiment, it is possible to remove dust and debris not only from the back surface (downstream side) of the bar screen 7, but also from the brace 6 that connects the bar that supports and fixes the bar screen 7 on the downstream side to the cross beam 4.

[0035] Furthermore, by adjusting the diameter of the cylindrical tube 13 of the rotating brush 10 and the length of the brush bristles 14 and rubber material 12 that make up the brush part, the contact range of the brush part of the rotating brush 10 can be adjusted, and therefore the range of dust removal can be adjusted.

[0036] According to the bar screen device of the present invention, the dust adhering to the back surface of the bar screen can be continuously removed and cleaned, so that clogging of the bar screen can be constantly prevented. Therefore, not only can sudden shutdowns of the power plant due to clogging of the bar screen be avoided, but the labor required for cleaning the bar screen is reduced and there is no need to suspend operation of the power plant.

[0037] In addition to the above, the configurations given in the above embodiments can be selected or appropriately changed to other configurations without departing from the spirit of the present invention. [Explanation of symbols]

[0038] 2, 12 Rubber material 4, 24 crossbeam 5, 25 rake 6 Braces 7, 27 Bar Screen 8 Rake's Teeth 9, 19 Guide rail 10 Rotating Brush 13 Cylindrical Tube 14 Brush bristles 16 Flange 20 Conventional bar screen device 21A Upper sprocket wheel 21B Lower sprocket wheel 22 Housing 23 Information Board 26 Carrying Chain

Claims

1. A bar screen installed across the intake channel in the width direction, A rake that moves upward along an upstream surface of the bar screen; A rotary brush is provided between two cross beams that are arranged at equal intervals and face each other vertically on the downstream side of the bar screen, and a guide rail for the rotary brush to move vertically is provided, The rotating brush includes a cylindrical tube having brush bristles formed radially thereon, the brush bristles being provided with a plurality of rubber members spaced at predetermined intervals in the longitudinal direction of the cylindrical tube, A bar screen device characterized in that the tines of the rake moving upward come into contact with the tip of the rubber material of the rotating brush, causing the rotating brush to rise and rotate.

2. The rotating brush has brush bristles formed radially around the entire outer surface of the cylindrical tube.

2. The bar screen apparatus according to claim 1, wherein the cylindrical tube has a hollow structure.

3. The length of the rubber material is longer than that of the brush bristles, 3. The bar screen device according to claim 2, wherein a tip of the rubber material is curved toward a water flow direction.

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