Bar screen type dust collector

Abstract

To prevent bending of rake claws of a rake. [Solution] The bar screen dust remover includes a bar screen 2 that captures dust in a waterway and a rake 3 that raises and discharges the dust captured by the bar screen 2. The bar screen 2 has a plurality of coarse screen bars 21 arranged along a third direction D3 and a plurality of fine screen bars 22 arranged between adjacent coarse screen bars 21. The plurality of fine screen bars 22 include a first bar 221 and a second bar 222 that have different lengths along the first direction D1. A first downstream end face 225 of the first bar 221 is located downstream of a second downstream end face 226 of the second bar 222. The rake 3 has a plurality of fine rake tines 32 inserted between adjacent fine screen bars 22, and the third downstream end face 320 of the fine rake tines 32 is aligned with the second downstream end face 226 of the second bar 222.

Description

[Technical Field]

[0001] The present invention relates to a bar screen type dust remover. [Background technology]

[0002] Sewage treatment plants and sewage pumping stations are equipped with bar screen dust collectors that remove dust from sewage. These bar screen dust collectors have a bar screen that captures dust in the flowing water and a rake that moves along the bar screen to pick up and discharge the dust captured by the bar screen.

[0003] Patent Document 1 discloses a bar screen type dust collector equipped with a bar screen having a coarse bar screen and a fine bar screen. The coarse bar screen is composed of a plurality of screen bars arranged at intervals in a direction intersecting the direction of sewage flow. The fine bar screen is composed of a plurality of screen bars arranged at intervals in a direction intersecting the direction of flow of running water between the screen bars that make up the coarse bar screen. The rake is provided with rake claws that are inserted between the plurality of screen bars. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3768518 Summary of the Invention [Problem to be solved by the invention]

[0005] In the bar screen of Patent Document 1, oil and mud contained in sewage can adhere to the sides of the screen bars. In particular, the smaller the spacing between the screen bars, the more likely it is that the gaps between the screen bars will be clogged with deposits, preventing the sewage from passing through. Deposits on the sides of the screen bars are removed by inserting rake claws between the screen bars. To remove deposits on the sides of the screen bars, the rake claws have approximately the same length as the sides of the screen bars in the direction of sewage flow.

[0006] When moving the rake to remove pebbles caught between the screen bars, a load is applied to the tip of the rake tines, creating a bending moment in the rake tines, which can cause the rake tines to bend and interfere with the operation of the bar screen dust collector. An object of the present invention is to suppress bending of the rake tines. [Means for solving the problem]

[0007] A bar screen dust collector in one embodiment includes a bar screen disposed in a waterway for capturing dust in the waterway, and a rake that moves in a direction intersecting the direction of water flow in the waterway to scoop up and discharge the dust captured by the bar screen. The bar screen has a plurality of coarse screen bars arranged at a first interval along the width direction of the waterway, and a plurality of fine screen bars arranged at a second interval along the width direction between adjacent coarse screen bars. The plurality of fine screen bars include a first bar and a second bar having different lengths along the water flow direction. The upstream end face of the first bar is aligned with the upstream end face of the second bar. The downstream end face of the first bar is located downstream of the downstream end face of the second bar. The rake has a plurality of fine rake claws that are inserted between adjacent fine screen bars. details The downstream end face of the eye rake claw is aligned with the downstream end face of the second bar. The second interval is between 10 mm and 25 mm. [Effects of the Invention]

[0008] According to the present invention, bending of the fine rake tines can be suppressed. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an external perspective view of a bar screen type dust remover according to an embodiment of the present invention; [Figure 2] FIG. 2 is a diagram schematically illustrating a side view of a bar screen type dust remover. [Figure 3] 2 is a diagram showing a cross section of a bar screen taken along line AA in FIG. 1 and a portion of the upper surface of a rake. [Figure 4] FIG. 2 is an external perspective view of a rake provided in the bar screen type dust remover. [Figure 5] FIG. 10 is a view showing a cross section of a bar screen and a part of the upper surface of a rake in a first modified example. [Figure 6] FIG. 10 is a view showing a cross section of a bar screen and a part of the upper surface of a rake in a second modified example. [Figure 7] FIG. 10 is a view showing a cross section of a bar screen and a part of the upper surface of a rake in a third modified example. [Figure 8] FIG. 10 is a view showing a cross section of a bar screen and a part of the upper surface of a rake in a fourth modified example. [Figure 9A] FIG. 10 is a view showing a cross section of a bar screen and a part of the upper surface of a rake in a fifth modified example. [Figure 9B] FIG. 10 is a view showing a cross section of a bar screen and a part of the upper surface of a rake in a fifth modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] <Embodiment> Hereinafter, a bar screen type dust collector according to one embodiment will be described with reference to the drawings. In the following description, the same or substantially the same components and elements will be designated by the same reference numerals. Furthermore, once a component or element has been described, the description will not be repeated.

[0011] [Overall configuration] Fig. 1 is an external perspective view of a bar screen type dust remover 1 according to an embodiment. Fig. 2 is a diagram schematically showing a side view of the bar screen type dust remover 1. In the following description, the bar screen type dust remover will simply be referred to as the dust remover 1. As shown in Fig. 2, the dust remover 1 is installed in a flow channel 5 through which sewage 50 flows, for example, in a sewage treatment plant or a sewage pumping station. The dust remover 1 includes a bar screen 2, a rake 3, and a drive mechanism 4.

[0012] The direction in which the sewage 50 flows is referred to as the first direction D1, the direction intersecting the first direction D1 is referred to as the second direction D2, and the direction intersecting the first direction D1 and the second direction D2 is referred to as the third direction D3. The second direction D2 is the direction in which the rake 3 moves, as will be described later. The third direction D3 is the width direction of the flow channel 5. Although Figures 1 and 2 show a case in which the second direction D2 is not perpendicular to the first direction D1, the second direction D2 may be perpendicular or substantially perpendicular to the first direction D1. Furthermore, the base end side of the first direction D1 indicated by the arrow in Figures 1 and 2 may be referred to as the upstream side, and the tip side thereof may be referred to as the downstream side.

[0013] [Bar Screen] FIG. 3 is a diagram showing a cross section of the bar screen 2 taken along line AA in FIG. 1 and a portion of the surface of a rake 3, which will be described later. As shown in FIGS. 1 and 3, the bar screen 2 has a plurality of coarse screen bars 21 and a plurality of fine screen bars 22. Each of the coarse screen bars 21 is a flat bar extending along the second direction D2. The coarse screen bars 21 are arranged so that the thickness direction of the flat bar is aligned with the third direction D3. The width T1 of the coarse screen bar 21 along the third direction D3 is equal to the thickness of the flat bar. The coarse screen bars 21 are arranged at a predetermined first interval M1 from each other in the third direction D3. The first interval M1 may be, for example, approximately 100 mm to 150 mm.

[0014] Each of the fine screen bars 22 is a flat bar extending in the second direction D2. The fine screen bars 22 are arranged so that the thickness direction of the flat bar is aligned with the third direction D3. The width T2 of the fine screen bar 22 in the third direction D3 is equal to the thickness of the flat bar. The fine screen bars 22 are also arranged between adjacent coarse screen bars 21. That is, the fine screen bars 22 are arranged in the third direction D3 at a predetermined second interval M2 between first intervals M1. The second interval M2 can be approximately 10 mm to 25 mm, and more preferably approximately 20 mm. The width T2 of the fine screen bar 22 is smaller than the width T1 of the coarse screen bar 21.

[0015] A protrusion that protrudes downstream is formed on a portion of the downstream end of each of the multiple coarse screen bars 21 and a portion of the downstream end of each of the multiple fine screen bars 22. The protrusions have through holes that pass through the protrusions along the third direction D3. Fastening members 6 such as bolts are inserted into the through holes to secure the multiple coarse screen bars 21 and the multiple fine screen bars 22 together. Spacers having a length corresponding to the second interval M2 are sandwiched between the coarse screen bars 21 and the fine screen bars 22 and between adjacent fine screen bars 22 in the third direction D3.

[0016] The multiple fine screen bars 22 include multiple first bars 221 and multiple second bars 222. The first bars 221 and the second bars 222 have different lengths in the first direction D1. Specifically, the first bars 221 are longer than the second bars 222 in the first direction D1. The length of the first bars 221 can be, for example, approximately 50 mm.

[0017] 3, five fine screen bars 22 are provided within the range of the first interval M1 in which the coarse screen bars 21A and 21B are provided. Note that the number of fine screen bars 22 provided within the first interval M1 is not limited to five. The number of fine screen bars 22 may be four or less, or six or more, as long as it is plural.

[0018] In the third direction D3, the first bar 221A is provided between the second bars 222A and 222B, and the first bar 221B is provided between the second bars 222B and 222C. In addition, in the third direction D3, the second bar 222A is provided between the coarse screen bar 21A and the first bar 221A, and the second bar 222C is provided between the coarse screen bar 21B and the first bar 221B. In other words, the first bars 221 and the second bars 222 are alternately arranged along the third direction D3 within the range of the first interval M1. That is, the first bars 221 and the second bars 222 are arranged with regularity in their arrangement in the third direction.

[0019] The first bars 221 and the second bars 222 are not limited to being alternately arranged along the third direction. For example, depending on the number of first bars 221 and second bars 222, a predetermined number of second bars 222 may be arranged between adjacent first bars 221.

[0020] A first upstream end face 223, which is the upstream end face of the first bar 221, and a second upstream end face 224, which is the upstream end face of the second bar 222, are located at the same or approximately the same position in the first direction D1. That is, the first bar 221 and the second bar 222 are aligned on the upstream side. As described above, the first bar 221 is longer than the second bar 222 in the first direction D1. Therefore, a first downstream end face 225, which is the downstream end face of the first bar 221, is located downstream of a second downstream end face 226, which is the downstream end face of the second bar 222.

[0021] The first upstream end face 223 of the first bar 221 and the second upstream end face 224 of the second bar 222 are located downstream by a deviation amount G1 from the third upstream end faces 210, which are the upstream end faces of the coarse screen bars 21A and 21B. In other words, the coarse screen bar 21 is positioned to protrude further upstream than the fine screen bar 22.

[0022] [rake] The rake 3 is disposed upstream of the bar screen 2 in the first direction D1. The dust collector 1 includes a plurality of rakes 3. FIG. 2 shows a case where two rakes 3A and 3B are provided. However, the number of rakes 3 is not limited to two, and may be one, or three or more. The rakes 3 are moved along the second direction D2 by a drive mechanism 4, which will be described later.

[0023] 4 is an external perspective view of the rake 3. The rake 3 has a frame 30, a coarse rake tines 31, and a fine rake tines 32. The coarse rake tines 31 and the fine rake tines 32 are formed on a flat steel 33 provided on the frame 30. The flat steel 33 is plate-shaped and extends in a direction intersecting with the second direction D2. In the third direction D3, the coarse rake tines 31 and the fine rake tines 32 are formed on the downstream end face of the flat steel 33, i.e., the end face facing the bar screen 2.

[0024] The coarse rake prongs 31 have a width W1 along the third direction D3 that corresponds to the first interval M1. The coarse rake prongs 31 are protruding portions that protrude downstream along the first direction D1 from the downstream end face of the flat steel 33 with a protruding width W2. The protruding width W2 corresponds to the amount of deviation G1 between the third upstream end face 210 of the coarse screen bar 21 and the upstream end face 220 of the fine screen bar 22 (i.e., the first upstream end face 223 and the second upstream end face 224).

[0025] A plurality of coarse rake tines 31 are formed along the third direction D3. Specifically, the coarse rake tines 31 are formed at third intervals M3 corresponding to the width T1 of the coarse screen bar 21. Therefore, the coarse rake tines 31 of the rake 3 are inserted between adjacent coarse screen bars 21A and 21B on the upstream side of the bar screen 2. Note that four coarse rake tines 31A, 31B, 31C, and 31D are shown in FIG. 4. However, the number of coarse rake tines 31 may be three or less, or five or more.

[0026] The fine rake prongs 32 are formed on the downstream end faces of the multiple coarse rake prongs 31. The fine rake prongs 32 have a width W3 along the third direction D3 that corresponds to the second interval M2. The fine rake prongs 32 are protruding portions that protrude downstream along the first direction D1 from the downstream end faces of the coarse rake prongs 31 by a protruding width W4. The protruding width W4 corresponds to the length of the second bar 222 in the first direction D1. That is, as shown in FIG. 3 , the third downstream end face 320 of the fine rake prong 32 is positioned at or approximately the same position as the second downstream end face 226 of the second bar 222 in the first direction D1.

[0027] A plurality of fine rake tines 32 are formed along the third direction D3. Specifically, a plurality of fine rake tines 32 are formed on the downstream end surfaces of the plurality of coarse rake tines 31. The fine rake tines 32 are formed at fourth intervals M4 corresponding to the width T2 of the fine screen bar 22. Therefore, the fine rake tines 32 of the rake 3 are inserted between adjacent fine screen bars 22 from the upstream side of the bar screen 2. Note that FIG. 4 shows an example in which six fine rake tines 32 are formed on each coarse rake tine 31. However, the number of fine rake tines 32 formed on each coarse rake tine 31 may be five or less, or seven or more.

[0028] [Drive mechanism] The drive mechanism 4 has sprockets 41A and 41B and a chain 42. As shown in FIG. 2, the sprocket 41A is provided at one end of the bar screen 2 in the second direction D2. The sprocket 41B is provided at the other end of the bar screen 2 in the second direction D2. In the following description, the side on which the sprocket 41A is provided may be referred to as the upper side, and the side on which the sprocket 41B is provided may be referred to as the lower side.

[0029] Each of the sprockets 41A and 41B rotates due to the driving force output from a driving source such as a motor. A chain 42 is stretched across the two sprockets 41A and 41B. Rakes 3A and 3B are attached to a portion of the chain 42 at predetermined intervals.

[0030] When the sprockets 41A and 41B rotate, the chain 42 goes around the circumference S on the upstream side of the bar screen 2. As the chain 42 goes around the circumference S, the rakes 3A and 3B attached to the chain 42 also go around the circumference S.

[0031] [Operation] As shown in FIG. 2 , the dust remover 1 is disposed in the flow channel 5. At this time, the lower end of the bar screen 2 is in contact with the bottom 51 of the flow channel 5. The bar screen 2 of the dust remover 1 disposed in the flow channel 5 captures dust flowing through the flow channel 5. As described above, the third upstream end face 210 of the coarse screen bar 21 is located upstream of the upstream end face 220 of the fine screen bar 22. Therefore, the third upstream end face 210 of the coarse screen bar 21 captures dust having a width equal to or greater than the first interval M1 (coarse dust). Small dust having a width less than the first interval M1 (fine dust) is captured by the upstream end face 220 of the fine screen bar 22.

[0032] As described above, the width T1 of the coarse screen bar 21 is greater than the width T2 of the fine screen bar 22. Therefore, even if coarse dust comes into contact with the coarse screen bar 21, damage to the coarse screen bar 21 is suppressed.

[0033] When the sprockets 41A and 41B of the drive mechanism 4 rotate, the chain 42 moves along the circumferential direction D4 around the periphery S. As the chain 42 moves, the rake 3 attached to the chain 42 also moves along the circumferential direction D4.

[0034] The rake 3 engages with the upstream side of the bar screen 2 near the bottom 51 of the water channel 5. Specifically, the coarse rake tines 31 are inserted between the coarse screen bars 21 arranged at a first interval M1. The fine rake tines 32 are inserted between the fine screen bars 22 arranged at a second interval M2. This brings the rake 3 and the bar screen 2 into an engaged state.

[0035] Thereafter, the rake 3 moves in the second direction D2 in accordance with the movement of the chain 42. As the rake 3 moves, the coarse rake tines 31 scrape upward the coarse dust captured by the coarse screen bar 21. The fine rake tines 32 scrape upward the fine dust captured by the fine screen bar 22.

[0036] When fine debris, such as pebbles, trapped between the fine screen bars 22 is raked up, a load is generated on the downstream side of the fine rake tines 32. As described above, in the first direction D1, the third downstream end face 320 of the fine rake tines 32 is positioned at the same position as or approximately at the same position as the second downstream end face 226 of the second bar 222. That is, the length of the fine rake tines 32 along the first direction D1 (i.e., the length of the protruding width W4) is shorter than the length of the first bar 221 along the first direction D1. Therefore, the bending moment acting on the fine rake tines 32 of this embodiment is smaller than when the protruding width W4 of the fine rake tines 32 is the same as the length of the first bar 221 along the first direction D1. As a result, bending of the fine rake tines 32 when raking up fine debris is suppressed.

[0037] The dust picked up by the rake 3 is discharged above ground above the waterway 5 and collected in a collection section (not shown). After the dust has been discharged, the rake 3 moves back into the waterway 5 as the chain 42 moves. Thereafter, by repeating the above operation, the dust captured by the bar screen 2 is picked up and discharged.

[0038] [Effects obtained by the embodiment] According to the above-described embodiment, at least one of the following advantageous effects can be obtained.

[0039] (1) The multiple fine screen bars 22 include a first bar 221 and a second bar 222 that have different lengths along the first direction D1, and in the first direction D1, the first downstream end face 225 of the first bar 221 is located downstream of the second downstream end face 226 of the second bar 222. The rake 3 has multiple fine rake tines 32 that are inserted between the multiple fine screen bars 22. In the first direction D1, the position of the third downstream end face 320 of the fine rake tine 32 is aligned with the position of the second downstream end face 226 of the second bar 222.

[0040] This allows the length (projection width W4) of the fine rake tines 32 in the first direction D1 to be shortened while still allowing the fine rake tines 32 to remove deposits on the sides of the fine screen bars 22. As a result, the fine rake tines 32 are prevented from being subjected to excessive loads due to pebbles or the like caught between the fine screen bars 22, and bending of the fine rake tines 32 is prevented. This prevents operational problems, such as the dust collector 1 stopping, caused by bending of the fine rake tines 32.

[0041] Furthermore, the length of the second bar 222 along the first direction D1 can be made shorter than that of the first bar 221. As a result, the weight of the bar screen 2 can be reduced compared to when the fine screen bar 22 is made up of only the first bar 221.

[0042] (2) In the first direction D1, the positions of the first upstream end face 223 and the second upstream end face 224 are located downstream of the third upstream end faces 210 of the multiple coarse screen bars 21. As a result, coarse dust is captured by the coarse screen bars 21, and fine dust is captured by the fine screen bars 22. As a result, damage to the fine screen bars 22 due to collision of coarse dust with the fine screen bars 22 is suppressed.

[0043] (3) The width T2 of each of the fine screen bars 22 is the same. This makes it easier to manufacture the bar screen 2 and the rake 3, which contributes to reducing the manufacturing cost of the dust remover 1.

[0044] (4) The second interval M2 is constant, which makes it easy to manufacture the bar screen 2 and the rake 3, thereby reducing the manufacturing cost of the dust remover 1.

[0045] <First Modification> In the embodiment described above, the upstream end face of the fine screen bar 22 is located downstream by the offset amount G1 from the third upstream end face 210 of the coarse screen bar 21. However, the structure of the bar screen 2 is not limited to this example.

[0046] Fig. 5 is a diagram showing a cross section of the bar screen 2 included in the dust remover 1 in the first modified example and a portion of the upper surface of the rake 3. Note that Fig. 5 shows the cross section of the bar screen 2 at the same position as Fig. 3. In the first direction D1, the upstream end face 220 of the fine screen bar 22 (i.e., the first upstream end face 223 and the second upstream end face 224) and the third upstream end face 210 of the coarse screen bar 21 are located at the same or approximately the same position. In this case, the structure and arrangement of the multiple coarse screen bars 21 in the third direction D3 and the structure and arrangement of the multiple fine screen bars 22 in the third direction D3 are the same as those in the above-described embodiment.

[0047] In this case, the rake 3 does not need to have a coarse rake tine 31. That is, it is sufficient if a plurality of fine rake tines 32 are formed along the third direction D3 on the downstream end face of the flat steel 33, i.e., the end face facing the bar screen 2. In the first modified example, the plurality of fine rake tines 32A, 32B, 32C, 32D, 32E, and 32F are also provided at fourth intervals M4 corresponding to the width T2 of the fine screen bar 22. However, the fine rake tines 32A and 32G and the fine rake tines 32F and 32H are arranged at a third interval M3 corresponding to the width T1 of the coarse screen bar 21.

[0048] Since the bar screen 2 of the dust remover 1 has the above-described structure, coarse dust and fine dust are captured at the upstream ends of the coarse screen bars 21 and the fine screen bars 22.

[0049] In the first modified example, by having the above-described configuration, it is possible to obtain the same effects as the effects (1), (3), and (4) obtained by the embodiment. In addition, the bar screen 2 can be manufactured using the upstream end face 220 of the fine screen bar 22 and the third upstream end face 210 of the coarse screen bar 21 as the reference plane. This makes it possible to manufacture the bar screen 2 easily and accurately.

[0050] <Second Modification> In the above-described embodiment, the width T1 of each of the multiple coarse screen bars 21 is equal, and the width T2 of each of the multiple fine screen bars 22 is equal. However, the structure of the bar screen 2 is not limited to this example.

[0051] Fig. 6 is a diagram showing a cross section of the bar screen 2 and a portion of the upper surface of the rake 3 included in the dust remover 1 in the second modified example. Note that Fig. 6 shows the cross section of the bar screen 2 at the same position as Fig. 3. As shown in Fig. 6, in the third direction D3, the width T1A of the coarse screen bar 21A is smaller than the width T1B of the coarse screen bar 21B.

[0052] Additionally, in the second direction D2, the width T2A of the second bars 222A and 222C of the fine screen bar 22 is larger than the width T2B of the second bar 222B. The second bar 222B and the first bars 221A and 221B have the same width T2B. That is, the width T2A of some of the second bars 222 included in the fine screen bar 22 is larger than the width T2B of the other second bars 222. This improves the strength of the fine screen bar 22 in capturing fine dust.

[0053] In this case, in the third direction D3, the coarse rake tines 31A and 31B of the rake 3 are arranged at a third interval M3A corresponding to the width T1A of the coarse screen bar 21A. Also, the coarse rake tines 31B and 31C are arranged at a third interval M3B corresponding to the width T1B of the coarse screen bar 21A.

[0054] In addition, in the third direction D3, the fine rake tines 32A and 32B and the fine rake tines 32E and 32F of the multiple fine rake tines 32 of the rake 3 are arranged at a fourth interval M4A corresponding to the width T2A of the second bars 222A and 222C, respectively. The fine rake tines 32B, 32C, 32D, and 32E are arranged at a fourth interval M4B corresponding to the width T2B between the first bars 221A and 221B and the second bar 222B.

[0055] The widths T2A of the second bars 222A and 222C may be different from each other, i.e., each of the multiple second bars 222 may have a different width T2. Also, each of the multiple first bars 221 may have a different width T1. Alternatively, each of the multiple first bars 221 may have the same width, and each of the multiple second bars 222 may have the same width, but the widths of the first bars 221 and the second bars 222 may be different from each other. In other words, the multiple coarse screen bars 21 may include at least one coarse screen bar 21 whose width in the third direction D3 is different. Also, at least one of the multiple coarse screen bars 21 may have the same width as at least one fine screen bar 22 of the multiple fine screen bars 22.

[0056] In the second modified example, by having the above-described configuration, it is possible to obtain the same effects as the effects (1), (2), and (4) obtained by the embodiment. Furthermore, in the flow channel 5, second bars 222 having a width T2 larger than second bars 222 arranged in other positions can be arranged in positions where relatively large pieces of fine dust are likely to reach. This suppresses damage to the fine screen bars 22 and improves the durability of the bar screen 2. The bar screen 2 of the second modified example may have the same structure as that of the first modified example.

[0057] <Third Modification> In the above-described embodiment, the multiple coarse screen bars 21 are arranged at first intervals M1. Furthermore, the first bars 221 and second bars 222 of the multiple fine screen bars 22 are arranged alternately at second intervals M2. In other words, the fine screen bars 22 are arranged with regularity. However, the structure of the bar screen 2 is not limited to this example.

[0058] Fig. 7 is a diagram showing a cross section of the bar screen 2 provided in the dust collector 1 in the third modified example and a portion of the upper surface of the rake 3. Fig. 7 shows the cross section of the bar screen 2 at the same position as in Fig. 3. Fig. 7 shows, as an example of the third modified example, a case in which the fine screen bar 22 has two first bars 221 and six second bars 222.

[0059] Two second bars 222A and 222B are provided between the coarse screen bar 21A and the first bar 221A. Three second bars 222C, 222D, and 222E are provided between the first bars 221A and 221B. One second bar 222F is provided between the first bar 221B and the coarse screen bar 21B.

[0060] Furthermore, the second spacing M2 of each of the multiple fine screen bars 22 may be the same, different, or partially different. In FIG. 7, the second bars 222A and 222B and the first bar 221A are each spaced apart by a second spacing M2A. The first bar 221A and the second bar 222C are spaced apart by a second spacing M2B that is larger than the second spacing M2A. The second bars 222C and 222D are spaced apart by a second spacing M2C that is larger than the second spacing M2B. The second bars 222D and 222E and the first bar 221B are spaced apart by a second spacing M2B. The first bar 221B and the second bar 222F are spaced apart by a second spacing M2D that is larger than the second spacing M2C.

[0061] Furthermore, no fine screen bar 22 is provided between the coarse screen bars 21B and 21C. In this case, the first spacing M1B between the coarse screen bars 21B and 21C is smaller than the first spacing M1A between the coarse screen bars 21A and 21B. In other words, in the third modified example, the spacing between the multiple coarse screen bars 21 and the multiple fine screen bars 22 in the third direction D3 and the arrangement order of the first bars 221 and second bars 222 do not have any regularity.

[0062] In this case, the width W3 of the fine rake tines 32 of the rake 3 in the third direction D3 corresponds to the second spacing M2 between the fine screen bars 22. In the example shown in FIG. 7, the fine rake tines 32A, 32B, 32C, and 32J inserted into the second spacing M2A have a width W3A. The fine rake tines 32D, 32F, and 32G inserted into the second spacing M2B, which is larger than the second spacing M2A, have a width W3B, which is larger than the width W3A. The fine rake tine 32E inserted into the second spacing M2C, which is larger than the second spacing M2B, has a width W3C, which is larger than the width W3B. The fine rake tine 32H inserted into the second spacing M2D, which is larger than the second spacing M2C, has a width W3D, which is larger than the width W3C.

[0063] In the third modified example, by having the above-described configuration, it is possible to obtain the same effects as the effects (1), (2), and (3) obtained by the embodiment. Note that the bar screen 2 of the third modified example may have the same structure as the first modified example or the second modified example.

[0064] <Fourth Modification> In the above-described embodiment, the cross-sectional shapes of the plurality of coarse screen bars 21 and the plurality of fine screen bars 22 of the bar screen 2 are rectangular. However, the structure of the bar screen 2 is not limited to this example.

[0065] Fig. 8 is a diagram showing a cross section of the bar screen 2 provided in the dust remover 1 in the fourth modified example and a part of the upper surface of the rake 3. Note that Fig. 7 shows the cross section of the bar screen 2 at the same position as Fig. 3.

[0066] As shown in FIG. 8 , the first bars 221A and 221B of the fine screen bar 22 have widened portions 227 near the first upstream end faces 223 thereof, which are wider in the third direction D3 than the first downstream end faces 225 thereof. The second bars 222A and 222C are wedge-shaped, with their widths in the third direction D3 increasing toward the second upstream end faces 224. The second bar 222B has curved side faces 228 that increase in width in the third direction D3 toward the second upstream end faces 224. That is, the widths of the third upstream end faces 210 of the coarse screen bar 21 and the upstream end faces 220 of the fine screen bar 22 are wider than those on the downstream side. This prevents dust from getting caught between the fine screen bars 22 and prevents clogging of the bar screen 2.

[0067] In the fourth modified example, by having the above-described configuration, in addition to the same effects as the effects (1), (2), and (4) obtained by the embodiment, the following effects can be obtained.

[0068] The width of the fine screen bars 22 in the third direction D3 increases toward the upstream side in the first direction D1, thereby preventing dust from getting caught between the fine screen bars 22 on the downstream side and preventing the bar screen 2 from becoming clogged.

[0069] The bar screen 2 of the fourth modified example may have the same structure as those of the first, second, and third modified examples.

[0070] <Fifth Modification> In the above-described embodiment, each of the coarse rake tines 31 of the rake 3 is inserted between each of the coarse screen bars 21 arranged at a first interval M1. Each of the fine rake tines 32 of the rake 3 is inserted between each of the fine screen bars 22 arranged at a second interval M2. However, the structure of the rake 3 is not limited to this example.

[0071] 9A and 9B are diagrams showing a cross section of the bar screen 2 and the upper surface of the rake 3 included in the dust remover 1 in the fifth modified example. Note that FIGS. 9A and 9B show the cross section of the bar screen 2 at the same position as in FIG. 3.

[0072] The dust remover 1 of the fifth modified example includes a plurality of rakes 3. The arrangement of the plurality of coarse rake tines 31 and the arrangement of the plurality of fine rake tines 32 are different in each of the plurality of rakes 3. Specifically, as shown in Fig. 9A, the rake 3A has three coarse rake tines 31A, 31B, and 31D. In other words, no coarse rake tines are provided between the coarse rake tines 31B and 31D.

[0073] The coarse rake tines 31A are provided with four fine rake tines 32A, 32C, 32E, and 32F. The coarse rake tines 31B are provided with six fine rake tines 32A, 32B, 32C, 32D, 32E, and 32F. The coarse rake tines 31D are provided with four fine rake tines 32A, 32B, 32E, and 32F.

[0074] As shown in Figure 9B, the rake 3B has three coarse rake tines 31A, 31C, and 31D. That is, there is no coarse rake tine between the coarse rake tines 31A and 31C. The coarse rake tines 31A have three fine rake tines 32A, 32B, and 32D. The coarse rake tines 31C have six fine rake tines 32A, 32B, 32C, 32D, 32E, and 32F. The coarse rake tines 31D have four fine rake tines 32A, 32C, 32D, and 32F.

[0075] In this case, as the rakes 3A and 3B move along the circumferential direction D4, the coarse rake tines 31 are inserted at least once between all of the coarse screen bars 21 arranged at the first interval M1. Similarly, the fine rake tines 32 are inserted at least once between all of the fine screen bars 22 arranged at the second interval M2.

[0076] Specifically, the rake 3A does not have fine rake tines 32 inserted between the first bar 221A and the second bar 222A downstream of the coarse rake tines 31A, and between the first bar 221B and the second bar 222B. However, the fine rake tines 32B and 32D formed on the coarse rake tines 31A of the rake 3B are inserted between the fine screen bars 22.

[0077] Similarly, the rake 3A does not have fine rake tines 32 inserted between the first bar 221A and the second bar 222B downstream of the coarse rake tines 31D and between the first bar 221B and the second bar 222B. However, the fine rake tines 32C and 32D formed on the coarse rake tines 31D of the rake 3B are inserted between the fine screen bars 22.

[0078] Furthermore, the rake 3A does not have a coarse rake tine 31 or a fine rake tine 32 between the coarse rake tines 31B and 31D. However, the coarse rake tine 31C of the rake 3B and the fine rake tines 32A, 32B, 32C, 32D, 32E, and 32F formed on the coarse rake tine 31C are inserted between the coarse screen bars 21 and the fine screen bars 22. Similarly, the rake 3B does not have a coarse rake tine 31 or a fine rake tine 32 between the coarse rake tines 31A and 31C. However, the coarse rake tines 31B of the rake 3A and the fine rake tines 32A, 32B, 32C, 32D, 32E and 32F formed on the coarse rake tines 31B are inserted between the coarse screen bars 21 and the fine screen bars 22.

[0079] As a result, dust captured by the bar screen 2 that is not stirred up and discharged by the movement of rake 3A is stirred up and discharged by the movement of rake 3B. Dust captured by the bar screen 2 that is not stirred up and discharged by the movement of rake 3B is stirred up and discharged by the movement of rake 3A. In other words, dust captured by the bar screen 2 is discharged by rakes 3A and 3B without being left behind on the bar screen 2. At this time, the amount of dust stirred up by each of rakes 3A and 3B is less than the amount of dust stirred up by a single rake 3 in the embodiment. This reduces the load on each of rakes 3A and 3B. As a result, the durability of rakes 3A and 3B can be improved.

[0080] In the fifth modified example, by having the above-described configuration, in addition to the same effects as the effects (1), (2), (3) and (4) obtained by the embodiment, the following effects can be obtained.

[0081] The coarse rake tines 31 of the rake 3A and the coarse rake tines 31 of the rake 3B are positioned at different positions in the third direction D3. When the rakes 3A and 3B move along the second direction D2, the coarse rake tines 31 are inserted between the coarse screen bars 21 at least once. Furthermore, the fine rake tines 32 of the rake 3A and the fine rake tines 32 of the rake are positioned at different positions in the third direction D3. When the rakes 3A and 3B move along the second direction D2, the fine rake tines 32 are inserted between the fine screen bars 22 at least once. This allows the bar screen 2 to remove all captured dust and reduces the load on the rakes 3A and 3B due to the weight of the dust. As a result, the durability of the rakes 3A and 3B can be improved.

[0082] The bar screen 2 of the fifth modified example may have the same structure as the first, second, third, or fourth modified example.

[0083] Although various embodiments and modifications have been described above, the present invention is not limited to these. Other embodiments that are conceivable within the scope of the technical idea of ​​the present invention are also included within the scope of the present invention. [Explanation of symbols]

[0084] 1... dust remover (bar screen type dust remover), 2... bar screen, 3, 3A, 3B... rake, 5... flow channel, 21, 21A, 21B, 21C... coarse screen bar, 22... fine screen bar, 31... coarse rake tines, 32... fine rake tines, 210... third upstream end face, 220... upstream end face, 221, 221A, 221B... third 1 bar, 222, 222A, 222B, 222C, 222D, 222E, 222F... 2nd bar, 223... 1st upstream end face, 224... 2nd upstream end face, 225... 1st downstream end face, 226... 2nd downstream end face, 227... widened portion, 320... 3rd downstream end face, D1... 1st direction, D2... 2nd direction, D3... 3rd direction, M1... 1st interval, M2... 2nd interval

Claims

1. A bar screen provided in the flow channel to capture dust in the flow channel; a rake that moves in a direction intersecting the direction of flow of water in the flow channel to scoop up and discharge the dust captured by the bar screen; The bar screen is a plurality of coarse screen bars arranged at first intervals along the width direction of the flow channel; a plurality of fine screen bars arranged at second intervals along the width direction between adjacent coarse screen bars, The plurality of fine screen bars include a first bar and a second bar having different lengths along the water flow direction, the position of the upstream end face of the first bar and the position of the upstream end face of the second bar are aligned, a downstream end face of the first bar is located downstream of a downstream end face of the second bar, The rake has a plurality of fine rake claws inserted between adjacent fine screen bars, The position of the downstream end face of the fine rake claw is aligned with the position of the downstream end face of the second bar, The second interval is 10 mm to 25 mm. Bar screen type dust collector.

2. The bar screen type dust remover according to claim 1, a bar screen type dust remover, wherein the upstream end face of the first bar and the upstream end face of the second bar are positioned downstream of the upstream end faces of the plurality of coarse screen bars.

3. The bar screen type dust remover according to claim 1, A bar screen type dust remover, wherein the width of each of the fine screen bars in the width direction is the same.

4. The bar screen type dust remover according to claim 1, A bar screen type dust remover, wherein the second interval is constant.

5. The bar screen type dust remover according to claim 1, A bar screen type dust remover, wherein the width of the plurality of fine screen bars increases toward the upstream side in the width direction.

6. The bar screen type dust remover according to claim 1, A plurality of the rakes are provided, Each of the plurality of rakes has a coarse rake tine that is inserted between the plurality of coarse screen bars arranged at the first intervals, The coarse rake claws of one of the plurality of rakes and the coarse rake claws of the other rakes are provided at different positions in the width direction, When the plurality of rakes move, the coarse rake claws are inserted between the plurality of coarse screen bars at least once.

7. The bar screen type dust remover according to claim 1, A plurality of the rakes are provided, The fine rake claws of one of the plurality of rakes and the fine rake claws of the other rakes are provided at different positions in the width direction, In the bar screen type dust remover, when the plurality of rakes move, the fine rake claws are inserted at least once between the plurality of fine screen bars.

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