Dust removal device

Abstract

To provide a dust remover that facilitates a work such as maintenance and inspection of rollers in a carrying chain comprising rollers that roll along guide rails.SOLUTION: A dust remover 1 comprises: a pair of carrying chains 11 each of which is endless and is arranged along a vertical direction V; a screen 17 that is provided between the pair of carrying chains 11 and catches dust carried by water flow WF; a sprocket wheel 13 around which the carrying chain 11 is wound at the upper end side; a plurality of second roller 27 rotatably supported outside in the width direction W of each of the pair of carrying chains 11; and a second guide 15 protruding downward at the lower end side of the pair of carrying chains 11, on which the second roller 27 rolls.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Generally, power plants such as thermal power plants have intake channels for taking in seawater from the ocean as cooling water, but since the water taken in can contain debris and aquatic organisms and cannot be used as is, a dust removal device is installed in the intake channel to capture debris and aquatic organisms in the water. The dust removal equipment is arranged across the width of the intake channel, and power plants with large water intake volumes use a continuous traveling screen that continuously moves in a circle to capture dust and other debris and pull it above the water. This dust removal device moves a pair of endless carrying chains from a drive unit via upper and lower and left and right sprocket wheels, and a screen with a mesh frame attached is attached to this carrying chain so that it crosses the intake channel. The upper sprocket wheel is fixed to an upper rotating shaft on the ground, and the lower sprocket wheel is fixed to a lower rotating shaft at the bottom of the channel. The left and right sprocket wheels are installed so that the intake channel is sandwiched between the pair of upper and lower sprocket wheels, and the upper and lower rotating shafts are provided between the left and right sprocket wheels so that they cross the channel.

[0003] When the area where the dust removal device is installed is narrow, it is necessary to reduce the turning radius or bending radius of the lower rotating shaft. Patent Document 1 discloses a carrying chain that can reduce the turning radius of the lower rotating shaft. The carrying chain of Patent Document 1 has end rollers at both longitudinal ends of each link plate, and an intermediate roller between the two end rollers. These rollers and the intermediate roller are arranged between a pair of parallel link plates. As a result, according to Patent Document 1, the end roller, intermediate roller, and end roller roll in contact with the outer inner wall surface, inner inner wall surface, and outer inner wall surface of the groove of the guide rail, respectively, allowing the carrying chain to turn smoothly even around guide rails with a small bending radius. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-137923 Summary of the Invention [Problem to be solved by the invention]

[0005] In the carrying chain of Patent Document 1, the end rollers and intermediate rollers are arranged between a pair of parallel and connected link plates. When performing maintenance, inspection, or repairs on the end rollers and intermediate rollers, it is necessary to disconnect the pair of link plates.

[0006] SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a dust removal device for a carrying chain having rollers that roll along guide rails, which allows for easy maintenance and inspection of the rollers. [Means for solving the problem]

[0007] The dust removal device of the present invention comprises a pair of endless carrying chains arranged vertically, a screen disposed between the pair of carrying chains to capture foreign matter carried by the water current, a sprocket wheel around which the carrying chain is wound at its upper end, a plurality of second rollers rotatably supported on the outer side of each of the pair of carrying chains in the width direction, and a second guide that protrudes downward at the lower end of the pair of carrying chains and on which the second rollers roll.

[0008] In the dust removal device of the present invention, each of the pair of carrying chains preferably comprises a pair of link plates arranged parallel to each other in the width direction W and connected in their longitudinal direction, a pair of connecting pins at both ends of the pair of link plates for connecting the pair of link plates to an adjacent pair of link plates, and a first roller rotatably supported on the connecting pin, the first roller being arranged more inward in the width direction W than the second roller and rolling on a first guide that protrudes downward.

[0009] In the dust removal device of the present invention, preferably, with respect to the vertical direction, the downward-facing second running surface of the second guide is provided above the upward-facing first running surface of the first guide, and the second roller runs on the second running surface and the first roller runs on the first running surface.

[0010] In the dust remover of the present invention, one or more second rollers are preferably provided between the pair of connecting pins.

[0011] In the dust remover of the present invention, the second roller is preferably rotatably mounted on a fixing pin that fixes the screen to the link plate.

[0012] In the dust removal device of the present invention, the second roller is preferably a pair of connecting pins at both ends of a pair of link plates that connect the pair of link plates to an adjacent pair of link plates, and is rotatably arranged coaxially with the first roller that is rotatably supported on the connecting pins. [Effects of the Invention]

[0013] According to the dust removal device of the present invention, the second roller is provided further outward in the width direction W than the carrying chain, so that maintenance and inspection of the rollers can be easily performed in a carrying chain having rollers that roll along the guide rail. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a side view showing a schematic configuration of a dust removal device according to an embodiment of the present invention. [Figure 2] 3 is a side view partially showing a carrying chain constituting the dust removal device according to the present embodiment. FIG. [Figure 3] FIG. 2 is a front view partially showing a carrying chain that constitutes the dust removal device according to the present embodiment. [Figure 4] 3 is a view showing the vicinity of the first guide and the second guide of the dust remover according to the present embodiment, viewed from the direction of arrow A in FIG. 2. FIG. [Figure 5] FIG. 10 is a side view showing the circular movement at the lower end side of the screen structure according to the embodiment. [Figure 6] 10A and 10B are diagrams illustrating a modified example of the screen structure according to the embodiment. [Figure 7] 10A and 10B are diagrams illustrating a modified example of the screen structure according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The dust remover 1 according to this embodiment employs a continuous traveling screen that continuously moves a screen structure 20 around and pulls it above water, removing foreign matter such as dust from the water when drawing water from the sea or a river. The upper end of the dust remover 1 is supported by a sprocket wheel 13 for circulating movement. The lower end of the carrying chain 11 is supported by a first roller 25 and a second roller 27 that are provided on the carrying chain 11 and are guided by a first guide 14 and a second guide 15, respectively, for circulating movement. The support structure for the lower carrying chain 11, which will be described later, facilitates maintenance and inspection of the dust remover 1. The dust remover 1 will now be described in the order of its configuration, operation, and effects.

[0016] [Overall configuration of dust removal device 1: Figure 1] 1, the dust removal device 1 is installed in a waterway WW such as the sea or a river, and includes a dust removal unit 10 that removes dust using a screen structure 20 that captures foreign matter such as garbage carried in the water, and a drive unit 30 that operates the dust removal unit 10. The dust removal device 1 also includes a cleaning unit 40 that removes the foreign matter 17 captured by the screen structure 20. The dust removal section 10 is provided across the water surface OW above the water surface WS of the waterway WW and the underwater UW below the water surface WS, and removes dust and the like from the water flow WF when the screen structure 20 moves around in the underwater UW. The drive unit 30 is provided on the ground AG and drives the sprocket wheel 13 to rotate, thereby moving the carrying chain 11 in a circular motion. The cleaning unit 40 is also provided on the ground AG and sprays cleaning water toward the screen structure 20 to remove foreign matter from the screen 17 of the screen structure 20.

[0017] [Configuration of dust removal unit 10: Figures 1, 2, 3, and 4] As shown in Figure 1, the dust removal unit 10 includes an endless carrying chain 11 that moves in a vertical direction V, a sprocket wheel 13 that supports the carrying chain 11 at its upper end, and a first guide 14 and a second guide 15 that support the carrying chain 11 at its lower end underwater. The carrying chain 11, sprocket wheel 13, first guide 14, and second guide 15 are made of iron or other metallic materials. The carrying chain 11, sprocket wheel 13, and second guide 15 may also be made of a resin material as long as they have the required strength.

[0018] The carrying chain 11 has an upper end 11A supported by a sprocket wheel 13 and a lower end 11C supported by a second guide 15, each of which has an arc-shaped configuration. The intermediate portion 11B of the carrying chain 11, connecting the upper end 11A and the lower end 11C, has an upstream side 11B1 and a downstream side 11B2, which are arranged parallel to each other with respect to the water flow WF. As the carrying chain 11 moves in a circular motion, the portion of the carrying chain 11 located at the upper end 11A passes through the downstream side 11B2, the lower end 11C, and the upstream side 11B1 and returns to the upper end 11A. A pair of carrying chains 11 are provided spaced apart in the width direction W (FIG. 3) that intersects with the water flow WF. A plurality of screen structures 20 are provided between the pair of carrying chains 11. Specific configuration examples of the carrying chain 11 will be described later. A screen structure 20 is supported on the carrying chain 11, and a specific example of the structure will be described later.

[0019] The sprocket wheel 13 has a rotating shaft 13A rotatably supported by a fixed bearing (not shown), and a disk-shaped pulley 13B fixed coaxially to the rotating shaft 13A. An endless operating belt 35 of the drive unit 30 is wound around the pulley 13B, and by moving the operating belt 35 in a circular motion, the sprocket wheel 13 rotates, for example, clockwise in FIG. 1, and the carrying chain 11 moves in a circular motion.

[0020] 2 and 4, the first guide 14 has a first running surface 14A on the underside of the first roller 25. As an example, the first guide 14 has a J-shape that protrudes downward and is provided outside (below) the lower end side 11C of the carrying chain 11, and guides the circular movement of the carrying chain 11 from the lower end side 11C to the upstream side 11B1.

[0021] 2 and 4, the second guide 15 has a second running surface 15A on the upper side of the second roller 27. As an example, the second guide 15 has an arc shape that is provided inside (above) the lower end side 11C of the carrying chain 11. With respect to the vertical direction V as the reference, the downward-facing second running surface 15A is provided above the first running surface 14A of the first guide 14 and protrudes downward.

[0022] 3 and 4, the second roller 27 is disposed outboard of the first roller 25 in the width direction W, and the second roller 27 runs on the downward-facing second running surface 15A of the second guide 15, which is disposed outboard of the first roller 25. The first roller 25 is disposed inboard of the second roller 27 in the width direction W, and the first roller 25 runs on the upward-facing first running surface 14A of the first guide 14, inside the second roller 27. In this way, the first roller 25 and the second roller 27 run in association with the circular movement of the carrying chain 11 while being sandwiched between the first guide 14 and the second guide 15 in the area where the first guide 14 and the second guide 15 overlap.

[0023] [Examples of carrying chain 11: Figures 1, 3, and 4] Next, an example of the configuration of the carrying chain 11 will be described with reference to FIGS. As shown in Fig. 3, the carrying chain 11 includes a pair of link plates 21A, 21B arranged parallel to each other in the width direction W, and connecting pins 23, 23 that connect the upper and lower ends of the link plates 21A, 21B to the adjacent link plates 21A, 21B. The carrying chain 11 also includes first rollers 25, 25 that are rotatably supported by the connecting pins 23, 23 between the link plates 21A and 21B. The first rollers 25 run while rolling along the first running surface 14A of the first guide 14 at the lower end side 11C of the carrying chain 11. The link plate arranged on the inside in the width direction W with respect to the screen structure 20 is referred to as the link plate 21A, and the link plate arranged on the outside is referred to as the link plate 21B.

[0024] The carrying chain 11 is an endless chain having an upper end side 11A, a middle portion 11B, and a lower end side 11C connected together as shown in Fig. 1 by continuously connecting chain elements including link plates 21A, 21B, connecting pins 23, 23, and first rollers 25, 25 in the longitudinal direction. Also, as shown in Fig. 3, the pair of carrying chains 11, 11 are arranged at a predetermined interval in the width direction W, and the screen structure 20 is fixed between the chain elements.

[0025] As shown in FIGS. 3 and 4, the carrying chain 11 is provided with a second roller 27 on the outer side of the link plate 21B in the width direction W with respect to the screen structure 20. As an example in this embodiment, a pair (two) of second rollers 27 are provided between a pair of upper and lower connecting pins 23. That is, a pair of second rollers 27 are provided for a pair of link plates 21A and 21B with a gap in their extension direction. Each second roller 27 is rotatably mounted on a fixed pin 29 that penetrates from the link plate 21A through the link plate 21B. The second roller 27 travels while rolling along the second running surface 15A of the second guide 15 at the lower end side 11C of the carrying chain 11.

[0026] [Screen structure 20: Figures 2 and 3] Each screen structure 20 includes a screen 17, a screen frame 18 for fixing and holding the screen 17, and a foreign matter support 19 for collecting foreign matter captured on the screen 17.

[0027] 2 and 3, the screens 17 are moved around by a pair of carrying chains 11, 11 via a screen frame 18, capturing foreign matter in the underwater UW and removing it from the passing water flow WF. To this end, the screens 17 are arranged so as to intersect, typically perpendicular to, the water flow WF at least in the underwater UW. This arrangement is based on the arrangement of the carrying chains 11. 3 shows an example in which only one screen 17 is provided between a pair of carrying chains 11, 11, i.e., in the width direction W. However, in the present invention, a plurality of screens 17 can also be arranged side by side in the width direction W between a pair of carrying chains 11, 11.

[0028] The screen 17 is made of a member having a mesh size corresponding to the size of the debris to be removed, typically a rectangular wire mesh or punched metal in a plan view. For example, this wire mesh is made of a highly corrosion-resistant metal material, such as a mesh-like member woven with stainless steel wires. However, the stainless steel screen 17 is merely an example, and other highly corrosion-resistant metal materials, such as titanium, titanium alloys, nickel, nickel alloys, copper, and copper alloys, can also be used. Furthermore, the screen 17 is not limited to a metal material and may be made of a resin material, such as fiber-reinforced plastic.

[0029] As shown in Fig. 3, the periphery of each screen 17 is supported by a screen frame 18. Each screen frame 18 is fixed to the link plate 21A between the first rollers 25 on both sides in the width direction W by two fixing pins 29, 29. In this way, the fixing pins 29 perform the dual function of fixing the screen 17 to the link plate 21 in addition to rotatably supporting the second roller 27.

[0030] The screen frame 18 has, for example, a frame-like shape with a gap provided inside, and the screen 17 is attached to cover the gap with fasteners such as bolts (not shown). The screen frame 18 is also made of the same material as the screen 17.

[0031] The screen frame 18 is provided with a foreign object support 19 for holding foreign objects captured by the screen 17. The foreign objects held by the foreign object support 19 are collected in a foreign object container 34 shown in FIG.

[0032] 2 and 3, the foreign object support 19 is basically composed of three elements: an upper support 19A, a side support 19B, and a lower support 19C. These three elements are made of the same metal and resin materials as the screen 17. In addition to these three elements, ribs may also be provided to maintain the assembled state of the upper support 19A, side support 19B, and lower support 19C. When the screen 17 moves upstream relative to the direction of the water flow WF, that is, when the screen 17 is capturing foreign matter, an upper support 19A is attached to the top of the screen 17. As an example, the upper support 19A is continuous in the width direction W and is formed in a generally linear shape in a cross-sectional side view. The upper support 19A is provided at an angle so that its tip faces upward.

[0033] A side support 19B is attached to each side of the screen 17 in the width direction W. The upper part of the side support 19B is connected to the upper support 19A, and the lower part is connected to the lower support 19C. The side support 19B has a pentagonal shape, for example. A lower support 19C is attached to the lower part of the screen 17. The lower support 19C is formed in a V-shape (or an L-shape) in a cross-sectional side view.

[0034] When the screen 17 is in a state where it captures foreign matter, the upper support 19A, the pair of side supports 19B, and the lower support 19C form a capture area 19E that surrounds the area in front of the screen 17. The foreign matter captured by the screen 17 is captured in this capture area 19E mainly by the upper support 19A and the pair of side supports 19B. The captured foreign matter is transported to the cleaning unit 40, and then receives cleaning agent from the spray nozzle 41 and is collected in a foreign matter container 43.

[0035] [Drive unit 30: Figure 1] 1, the drive unit 30 includes a drive source 31, such as an electric motor, a rotary shaft 33 that is rotated by the drive source 31, and an actuation belt 35 that is wound around the rotary shaft 33 and the pulley 13B of the dust removal unit 10. When the drive source 31 is rotated via a control device (not shown), the sprocket wheel 13 is rotated, for example, clockwise via the rotary shaft 33 and actuation belt 35. This causes the carrying chains 11, 11 to move in a clockwise direction. This will be described in more detail in the next section on the operation of the dust removal device 1.

[0036] [Cleaning section 40: Figure 1] 1, the cleaning unit 40 includes a spray nozzle 41 that sprays cleaning water toward the screen 17 from inside the orbit of the carrying chain 11, and a foreign matter container 43 that collects foreign matter removed from the screen 17 and the foreign matter support 19 by the spray of cleaning water. The collected foreign matter is transported from the foreign matter container 43 to the outside periodically or at an appropriate time, and then processed.

[0037] [Operation of dust removal device 1: Figures 1 and 5] Next, the operation of the dust remover 1 will be described with reference to FIGS. In FIG. 1, when the drive source 31 of the drive unit 30 is driven to rotate, the carrying chains 11, 11 move clockwise. Accordingly, the screens 17 also move in a circular motion, sequentially passing from the upper end side 11A to the downstream side 11B2, the lower end side 11C, and the upstream side 11B1, and then returning to the upper end side 11A. As the screens 17 move upward in the vertical direction V through the upstream side 11B1, they capture foreign matter such as dust contained in the water flow WF. The captured foreign matter may remain trapped on the screen 17 and move to the upper end side 11A together with the screen 17, or may be housed in the foreign matter support 19 and move to the upper end side 11A. After the screen 17 passes the upper end side 11A, the foreign matter captured on either or both of the screen 17 and the foreign matter support 19 is sprayed with cleaning liquid from the spray nozzle 41 of the cleaning unit 40 and collected in the foreign matter container 43.

[0038] As the screen 17 moves from the downstream side 11B2 through the lower end side 11C to the upstream side 11B1, the first roller 25 runs along the first guide 14, and the second roller 27 runs along the second guide 15, as shown in Figures 5(a), (b), and (c). During this process, as shown in Fig. 2, when viewed from the side, the second guide 15 and the link plate 21 interfere with each other. However, as shown in Fig. 4, the link plate 21 does not interfere with the second guide 15 because the link plate 21 is located further outward in the width direction W than the position where the first roller 25 is located, that is, the position where the link plate 21 is located. It is also conceivable that the second roller 27 is not provided, and the second guide 15 is provided at a position corresponding to the first roller 25, and the first roller 25 is intended to run along the second guide 15. However, in this case, interference between the second guide 15 and the link plate 21 becomes more pronounced, and the carrying chain 11 cannot move in a circular motion. Therefore, according to this embodiment, the carrying chain 11 can be smoothly moved in a circular motion at the lower end side 11C without providing a sprocket wheel.

[0039] [effect] The effects of the dust remover 1 according to this embodiment will be described below. In the dust remover 1 according to this embodiment, the second roller 27 is provided outside the link plate 21 in the width direction W. If second roller 27 were provided between link plate 21A and link plate 21B, it would be necessary to release link plate 21A from link plate 21B when performing maintenance or inspection of second roller 27. However, according to dust removal device 1, second roller 27 is not provided between link plate 21A and link plate 21B, but is provided outside link plate 21 in the width direction W. This makes maintenance and inspection of second roller 27 easy.

[0040] Furthermore, if the second roller 27 is located further outward in the width direction W than the link plate 21, as mentioned above, the link plate 21 will not come into contact with the second guide 15, thereby ensuring smooth circular movement of the carrying chain 11. Furthermore, if the second roller 27 is provided outside the link plate 21 in the width direction W, the second roller 27 will not interfere with the sprocket wheel 13 provided on the upper end side 11A. Therefore, the sprocket wheel 13 can also be used in the same way as when only the first roller 25 was used at the time.

[0041] Next, the second roller 27 is attached using a fixing pin 29 for fixing the screen frame 18 to the link plate 21. Therefore, according to this embodiment, the structure between the pair of first rollers 25, 25 provided on the link plate 21 does not need to be changed, and there is no need to prepare any pins other than the fixing pin 29 that are dedicated to attaching the second roller 27.

[0042] The above describes a preferred embodiment of the present invention, but as long as it does not deviate from the gist of the present invention, which is to provide the second roller 27 on the outside of the link plate 21, it is possible to select and discard the configurations described in the above embodiment or to change to other configurations as appropriate. For example, the number of second rollers 27 provided in one screen structure 20 is not limited to two, and can be one, three, or four, for example, as shown in Figures 6(a), (b), and (c), depending on the structure and dimensions of the screen structure 20. In the example of four rollers as shown in Figure 6(c), the second roller 27 can be provided at the tip of the first roller 25 by utilizing the connecting pin 23 of the first roller 25, as shown in Figures 6(d) and 7. [Explanation of symbols]

[0043] 1 Dust removal device 3 Drive belt 10 Dust removal section 11 Carrying chain 11A Upper end side 11B Middle part 11B1 Upstream side 11B2 Downstream side 11C Lower end side 13 Sprocket wheel 13A Rotating shaft 13B Pulley 14 First Guide 15 Second Guide 20 Screen structure 17 screens 18 Screen Frame 19 Foreign body support 19A Upper Support 19B Side Support 19C Lower Support 19E Capture area 21, 21A, 21B link plates 23 Connecting pin 25 First Roller 27 Second Roller 29 Fixing pin 30 Drive unit 31 Power Source 33 Rotation axis 35 Operating belt 40 Cleaning section 41 Injection nozzle 43 Foreign object container OW Mizukami UW Underwater WF water flow WS water surface WW waterway V vertical direction W width direction

Claims

1. a pair of endless carrying chains arranged vertically; a screen provided between the pair of carrying chains for capturing foreign matter carried by the water current; a sprocket wheel around which the carrying chain is wound at its upper end; a plurality of second rollers rotatably supported on the outer sides of each of the pair of carrying chains in the width direction; a second guide on which the second roller rolls, the second guide protruding downward at the lower end side of the pair of carrying chains; Each of the pair of carrying chains includes: a pair of link plates arranged parallel to each other in the width direction W and connected in the longitudinal direction; a pair of connecting pins at both ends of the pair of link plates for connecting the pair of adjacent link plates; a first roller rotatably supported by the connecting pin, The dust removal device is characterized in that the first roller is disposed on the inner side of the second roller in the width direction and rolls on a first guide that protrudes downward.

2. With respect to the vertical direction, a downward second running surface of the second guide is provided above a first upward running surface of the first guide, the second roller travels on the second travel surface; The first roller runs on the first running surface. The dust removal device according to claim 1.

3. The second roller is One or more connecting pins are provided between the pair of connecting pins. The dust removal device according to claim 1 or 2.

4. The second roller is a fixing pin that fixes the screen to the link plate, the fixing pin being rotatably mounted on the fixing pin; The dust removal device according to claim 1 or 2.

5. The second roller is a pair of connecting pins at both ends of the pair of link plates for connecting the pair of adjacent link plates, the pair of connecting pins being rotatably provided coaxially with the first roller rotatably supported by the connecting pins; The dust removal device according to claim 1 or 2.

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