JP2006316561A - Dust elimination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a rake to be raised along a guide rail while stably keeping constant the clearance between the tip of the nail of the rake which is for scratching dregs captured by a screen, and a skirt plate. <P>SOLUTION: A dust-elimination device is provided with the screen 13, the skirt plate 14, and the rake 19. The screen 13 is provided with a plurality of screen bars extended in the up-and-down directions within a water passage, and the skirt plate 14 is arranged above the screen. Then the rake 19 scratches the dregs captured by the screen. The rake is provided with a plurality of rake nails 24, 25, and the skirt plate is provided with at least one skirt guide 15. Then at least one rake nail 24 among the plurality of rake nails is engaged with the skirt guide 15, and the rake 19 scratches the dregs captured by the screen. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dust removing device that removes dirt (sediment) in a water channel using a screen disposed in the water channel, and in particular, is disposed on the tip of the rake and the top of the screen that scrapes the screen trapped by the screen. The present invention relates to a dust removing device that can maintain a constant gap with a skirt plate.

  For example, in pumping stations that take in running water, it is necessary to protect the pump by catching coarse dust in the running water. Therefore, it is circulated with a screen consisting of a number of screen bars extending vertically in the suction channel. A dust removing device including an elevating rake is provided, and dust (sediment) deposited on a screen is continuously scraped and removed by the rake (see, for example, Patent Document 1).

When removing the residue trapped on the screen by scraping it upward with a rake, the screen is placed in the lower part of the slab (floor surface), and the upper part is a flat guide plate called a skirt plate As shown in FIG. 5, the rake and the residue retained on the rake rise (see FIG. 5 of Patent Document 1).
Japanese Patent Laid-Open No. 10-237848

  However, in the dust removing device, the rake is attached with guide rollers at both ends of the rake, and the guide rollers ascend along the guide rail. That is, the rake tip is determined by the position of the guide roller. The rake scraped off the residue with the screen rises while holding the residue, and rises from the water channel along the upper surface of the skirt plate while retaining the residue.

  When the rake rises along the upper surface of the skirt plate, it is necessary to keep the gap between the rake toe and the skirt plate constant. If this gap is not kept constant, the residue between the rake toes and the skirt plate will fall if the gap becomes large, and if the gap disappears, the rake toes will scratch the surface of the skirt plate. Because it will be attached. As described above, the rake rises while the guide rollers at both ends are regulated by the guide rails, but it is difficult to raise the rake plate while keeping the gap between the rake plate and the skirt plate constant over the entire width of the skirt plate. There was a problem.

  The present invention has been made in view of the above-described circumstances, and it is possible to raise the rake along the guide rail while keeping the gap between the toe of the rake and the skirt plate that scrapes the residue trapped on the screen constant and stable. An object of the present invention is to provide a dust removing device capable of preventing falling of a residue and contact of a rake toe with a skirt plate.

  The dust removing device of the present invention includes a screen in which a large number of screen bars extending vertically in a water channel are arranged, a skirt plate arranged at the top of the screen, and a rake that scrapes up the residue trapped on the screen. In the dust removing device, the rake includes a plurality of rake claws, the skirt plate includes at least one skirt guide, and at least one rake claw of the plurality of rake claws is associated with the skirt guide. In addition, the rake scoops up the residue trapped on the screen.

  The skirt plate includes at least one skirt guide, and the rake is captured by the screen while at least one rake claw is in contact with the skirt guide by its own weight. By scraping the residue, when the rake rises along the upper surface of the skirt plate, the gaps between the tips of all other rake claws and the skirt plate can be kept constant. In this way, with a very simple and simple structure, the gap between the rake claw and the skirt plate can be kept stable and constant, so that residue can fall along the way and the rake toe contacts the skirt plate. , Can prevent the surface from being scratched.

  The length of the rake claw that engages with the skirt guide is preferably shorter than the length of the rake claw that does not engage with the skirt guide. Thereby, the tip of another rake claw can be located inward rather than the thickness of a skirt guide.

  Further, a rake claw that engages with the skirt guide may be provided with a roller so that the rake is picked up by the screen while the roller is in contact with the skirt guide. Thereby, even if the weight of the rake increases, the problem of wear of the skirt guide does not occur, and the gap between the rake claw and the skirt plate can be kept stable and constant.

  The rake claw is preferably made of stainless steel, and the skirt guide is preferably made of high-polymer polyethylene having high wear resistance. Thereby, in the dust removing apparatus of a normal size, the problem of wear of the skirt guide hardly occurs, and the gap between the rake claw and the skirt plate can be stably kept constant.

  According to the present invention, since the gap between the rake toe and the skirt plate can always be kept constant over the entire width of the skirt plate, it is possible to provide a dust removing device capable of a stable scraping operation.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the member or element which has the same effect | action or function, and the overlapping description is abbreviate | omitted.

  FIG. 1 shows a dust removing apparatus according to an embodiment of the present invention, and FIG. 2 is a front view thereof. In this dust removing device, a screen 13 made up of a number of screen bars extending vertically in the water channel, which captures dust flowing in the water channel, is disposed in the water channel 11 between the side walls 12, 12. The screen 13 has a large number of screen bars extending in the vertical direction fixed and supported by spacer members (support members) extending in the horizontal direction and arranged at equal intervals. Is going to pass.

  The main members such as the screen bar of the screen 13 and its supporting member are preferably formed of a lightweight and highly corrosion-resistant resin material, but may be a steel material such as a strip steel.

  The screen 13 is disposed between the side walls 12 of the water channel 11, and a flat skirt plate 14 serving as a guide plate for the rake 19 is disposed above the slab (floor surface) 12A. Two skirt guides 15 and 15 are arranged on the skirt plate 14 as will be described in detail later. A wiper (not shown) is provided in the vicinity of the upper end of the skirt plate 14, and the residue transported by the rake 19 is transferred to the chute 23 for removal.

  The rake 19 is formed with a plurality of rake claws protruding into the space between the screen bars of the screen 13 so as to scrape the residue trapped on the front surface of the screen 13. Both ends of the rake 19 are connected to rake chains 18, 18 that run along frames 16, 16 provided at both ends of the screen 13, and run along the guide rails 17. The rake chains 18 and 18 travel by being driven by sprockets 21 and 21 installed at the top of the dust remover, and the sprockets 21 and 21 are attached to both ends of the drive shaft 20. The drive device 22 includes a speed reducer and a motor, and rotationally drives the drive shaft 20, whereby the chains 18 and 18 are rotated via the sprockets 21 and 21, and the rake 19 attached to the chains 18 and 18 is moved. It is designed to cycle.

  The drive shaft 20 has a mechanism that can be taken up and down so that the tension of the rake chains 18 and 18 can be adjusted. Moreover, although the drive device 22 has shown the system which attaches a drive machine directly to a drive shaft end, you may drive | operate with a separate drive machine via a chain by attaching a sprocket to a shaft end.

  The rake 19 that travels up along the screen 13 and the skirt plate 14 rakes up dust collected by the screen 13 on the front surface of the screen 13 and conveys it along the front surface of the skirt plate 14. In the vicinity of the upper end portion 14A of the skirt plate, the residue is transferred to the chute 23 and removed by a wiper (not shown). That is, the rake 19 is provided with a plurality of claws that are inserted into the space between the screen bars of the screen 13 and scrapes the residue, and when the rake rises along the screen 13, the tips of the claws are spaced between the screen bars. Drive on. As a result, when the residue is captured on the screen 13, the residue is held by the rake 19 and rises.

  When the rake 19 reaches the upper end 13 </ b> A of the screen 13, the tip of the claw of the rake 19 rises along the front surface of the skirt plate 14 while holding the residue. At this time, as will be described in detail later, a part (two in this case) of the claws of the rake 19 is pressed against the skirt guides 15 and 15 provided on the upper surface of the skirt plate 14 by its own weight. For this reason, the gap between the tip of the other nail and the skirt plate 14 is always kept constant over the entire width. Accordingly, it is possible to prevent the residue from falling due to the opening of the gap between the rake toe and the skirt plate seen in the conventional dust remover, and the damage to the skirt plate due to the rake toe contacting the skirt plate.

  When the rake 19 reaches the upper end 14 </ b> A of the skirt plate 14, the residue retained on the rake 19 by a wiper (not shown) is dropped onto the chute 23, and the rake 19 becomes empty. The rake 19 that has been raised ascends once to the highest position by the rotation of the rake chain 18, then reverses and descends to the lowest position on the upstream side of the water channel, and reverses from the vicinity of the lower end of the screen again. When the nail is inserted into the space between the screen bars and the rake 19 is raised, the residue trapped on the screen 13 is scraped up.

  FIG. 3A shows the overall structure viewed from above the rake, and FIG. 3B is an enlarged view of the main part thereof. In the rake 19, rake chains 18, 18 are fixed to attachments 19E at both ends of the fixing portion 19A, and guide shoes are provided on the attachment 19E. As the rake chains 18 and 18 travel, the guide shoes are guided to the guide rails 17 provided on the frame 16 and the rake 19 travels. A movable portion 19B is fixed to the fixed portion 19A of the rake so as to be rotatable with respect to the fixed portion 19A. The movable portion 19B is urged by a coil spring 19C and returns to a position regulated by the stopper 19D when rotated (see FIG. 4).

  The skirt plate 14 is provided with two skirt guides 15 on the left and right sides that engage with a part of the rake claws provided on the rake 19. The distal end of the movable portion 19B of the rake 19 is provided with a large number of two claws 24 that engage (contact) with the skirt guide 15 and many other claws 25 that do not engage (contact).

  FIG. 4 is a side view of the rake 19 that travels along the skirt plate 14. As shown in FIG. 4A, since the skirt guide 15 is provided on the skirt plate 14, some rake claws 24 are pressed against the skirt guide 15 by the weight of the rake 19. As the chains 18 and 18 run, the rake plate 14 is controlled while the guide shoe is regulated by the guide rail while the tip of the rake claw is pressed against the skirt guide 15 and the rake 19 holds the residue. Ascend along.

  At this time, as shown in FIG. 4B, all the other claws 25 have a certain clearance (in this case, 5 mm) with respect to the skirt plate 14. For this reason, it is possible to prevent the residue retained on the rake 19 from dropping with the claws open, and the claws contacting the skirt plate and scratching the surface.

  Here, the rake claw 24 is a claw that contacts the skirt guide 15, but is shorter than the other claw 25. In this embodiment, as shown in FIG. 4 (b), the height A of the skirt guide 15 protruding from the skirt plate 14 is 10 mm, and the length of the claw 24 contacting the skirt guide 15 is the other claw 25. Is shorter by a dimension B (in this case, 5 mm). Therefore, when the rake 19 travels along the skirt plate 14 while the claw 24 is in contact with the skirt guide 15, the gap between the tip of all the other claws 25 and the skirt plate 14 is a certain distance C, here 5 mm.

  As a result, the toes of the other claws 25 can be positioned inward of the contact surface of the skirt guide 15. Therefore, as the skirt guide 15, the thickness between the toe of the other claw 25 and the skirt plate 14 can be set to an arbitrary size while adopting a thickness that can be easily processed or assembled. In this embodiment, the two claws 24 come into contact with the skirt guide 15, so that the gap between the claw tips of the other claws 25 and the skirt plate 14 is 5 mm over the entire width of the rake 19 to prevent the fall of the residue. It can be kept in a small dimension suitable for the above.

  The main part of the rake 19 is preferably made of stainless steel having excellent corrosion resistance, and the claws 24 and 25 are also preferably made of stainless steel. As the skirt plate 14, a resin plate is generally used. However, as described above, the skirt plate 14 is rubbed and damaged when it comes into contact with the rake claw. Therefore, in the dust removing apparatus of this embodiment, it is preferable to use, as the skirt guide 15, a high molecular weight polyethylene resin having high wear resistance with respect to stainless steel having a thickness of 10 mm for the skirt plate 14. As a result, even if a portion of the rake 19 is pressed against the skirt guide 15 by its own weight so that the rake 19 travels along the skirt plate 14, the rake 19 has a large weight in the case of a normal channel width. In addition, the skirt guide 15 exhibits sufficient durability, and the skirt guide 15 is hardly worn.

  As shown in FIG. 4C, a roller 26 is attached to the tip of the claw that engages with the skirt guide, and the roller 26 is pressed against the skirt guide 15 on the skirt plate 14 so that the rake 19 travels. May be. The other claws 25 that do not engage with the skirt guide are secured to the skirt plate 14 in the same manner as in the above embodiment. Thus, by engaging the toe with the skirt guide with the roller, the wear of the skirt guide 15 can be reduced compared to the sliding method even when the water channel width is wide and the rake's own weight is large. Even in this way, it is the same that the residue retained on the rake 19 can be prevented from opening and dropping and the nail contacting the skirt plate and scratching its surface.

  In the above embodiment, the example in which the left and right skirt guides are provided on the skirt plate has been described. However, the number may be other than two as long as it is at least one.

  Here, one embodiment of the present invention has been described so far. However, the present invention is not limited to the above-described embodiment, and may of course be implemented in various forms within the scope of the technical idea. .

It is a perspective view which shows the dust removal apparatus of one Embodiment of this invention. It is a front view of the said dust removal apparatus. It is a top view which shows the relationship between the rake part of the said dust removal apparatus, and a skirt board. It is a side view which shows the relationship between the rake part of the said dust removal apparatus, and a skirt board.

Explanation of symbols

11 Waterway 12 Side wall 13 Screen 13A Screen upper end 14 Skirt plate 14A Skirt plate upper end 15 Skirt guide 16 Frame 17 Guide rail 18 Rake chain 19 Rake 19A Fixed portion 19B Movable portion 19C Coil spring 19D Stopper 19E Attachment 20 Drive shaft 21 Sprocket 22 Drive device 23 Chute 24 Rake claw 25 engaged with skirt guide Rake claw 26 not engaged with skirt guide Roller

Claims (4)

In a dust removing apparatus comprising a screen in which a large number of screen bars extending vertically in a water channel are arranged, a skirt plate arranged at the top of the screen, and a rake that scoops up residue trapped on the screen,
The rake has a plurality of rake claws,
The skirt plate includes at least one skirt guide,
A dust removing device, wherein at least one rake claw of the plurality of rake claws engages with the skirt guide, and the rake is picked up by the screen and scrapes up residue.   2. The dust removing device according to claim 1, wherein the length of the rake claw that engages with the skirt guide is shorter than the length of the rake claw that does not engage with the skirt guide.   2. The dust removing device according to claim 1, wherein a roller is provided on a rake claw that engages with the skirt guide, and the rake picks up the residue collected on the screen while the roller is in contact with the skirt guide. .   The dust removing apparatus according to claim 1, wherein the rake claw is made of stainless steel, and the skirt guide is made of high-polymer polyethylene having high wear resistance.

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