JP2006068703A - Dust remover, and removal method for grit and screen residue - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust remover which facilitates the maintenance of the device, and enables easy restart of operation even when a large amount of gravel is accumulated in the lower part of the dust remover during the stop of the operation. <P>SOLUTION: The dust remover comprises a screen for removing screen residues from flowing water, a pair of endless chains which are installed in both sides of the screen in the width direction and in which links composing the chains are connected so as to be rotated to a prescribed angle, a scraping plate which is connected to the pair of the endless chains, and scrapes up grit accumulated on the bottom of a water passage below the screen and the screen residues caught by the screen accompanied with the rotation of a pair of the endless chains, a drive sprocket which is installed in the upper part of the endless chain above the water surface, a support means which supports a part of the inside of the descending side of the endless chain, and a position adjusting means which displaces the position of the support means to enable the adjustment of the height position of the lowest part of the endless chain. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dust removing device for removing sediment in flowing water flowing into a sewage treatment plant or the like and removing sand sediments accumulated in a water channel, and a method for removing sand sediment and sieve.

  In sewage treatment plants, waste such as plastic, hair, leaves, wooden pieces, and scum in inflow raw water is previously removed by a dust removing device and sent to a treatment process. The separated material removed by the dust removing device is called sieve.

  The dust removing device for removing the sieve residue in the inflowing raw water is usually provided in a water channel that draws the raw water into a sewage treatment plant or the like. Gravels carried by the inflowing raw water may accumulate on the bottom of the water channel, particularly in the vicinity of the bottom of the screen of the dust removal device, which may reduce the sieve removal function of the dust removal device. Therefore, it is necessary to periodically remove the gravel (sedimentation) accumulated at the bottom of the channel.

On the other hand, in Japanese Patent Laid-Open No. 4-126505 (Patent Document 1), as a device capable of simultaneously lifting and removing the sieve residue and sedimentation in running water, “Sedimentation sediment removal machine” is disclosed. There is a description. The “sedimentation litter cleaning machine” described in Patent Document 1 includes a rake in each bucket of a sediment conveyor for lifting sand in a sand basin, and a lower portion of a bar screen disposed in an upstream water channel of the sand basin. A horizontal portion of the horizontal screen is connected to each other, and the bucket rake operated along the bottom of the pond is shifted from the horizontal portion of the screen to the bar screen to simultaneously sink sand and sediment.
JP-A-4-126505

  However, the “sedimentation litter scraper” described in Patent Document 1 has the following problems.

  (1) “Sedimentation and litter removal machine” described in Patent Document 1 requires machine parts such as a driven sprocket wheel, guide rollers, and guide rails for guiding an endless chain in the underwater part. Wear due to sedimentation is inevitable. For this reason, although these “sedimentation scouring machines”, especially the mechanical parts such as the driven sprocket wheel, guide rollers, and guide rails, are indispensable for daily inspection, these parts are always immersed in water. Therefore, visual inspection cannot be performed, which is a major problem in maintenance.

  (2) Also, in order to inspect and repair underwater machinery parts, it must be done after draining the sewage in the sand basin and emptying the sand basin, so the work is very long and complicated. Man-hours and costs increase.

  (3) The “sedimentation scouring machine” described in Patent Document 1 is provided with a bar screen on the inflow side of the sand basin for the purpose of capturing dust, and the bar screen is swept up by a rake or a bucket rake. I have to. However, since the rake or the bucket rake rakes the sand from the outflow (downstream) side of the sand basin toward the inflow (upstream) side, and then lifts it up, the lower part of the bar screen is It is necessary to provide a clearance that allows these to pass. The lower part of the bar screen has at least a bucket, a rake, or a bucket at the lower end of the bar screen toward the outflow side in parallel with the bottom of the sand basin in order to prevent dust from entering the sand basin from the part. It must be extended beyond the mounting interval of the dual-purpose rake. Due to such a structure, when sewage containing a large amount of gravel due to torrential rain or typhoon flows during the shutdown of the equipment, it extends to the outflow side in parallel with the bottom of the sand basin. The bucket or rake between the screen and the bottom of the pond, or the bucket combined rake, will be buried in the settling sand while being sandwiched between the screen and the pond bottom, literally losing the escape place and impossible to operate There is a serious problem that falls into. Once such a situation occurs, automatic recovery is impossible, and after the sand basin has been emptied, buckets and rakes buried in the sand or bucket rakes must be dug by hand. Therefore, it takes a lot of labor and cost.

  The present invention has been made to solve the above-mentioned problems, and the inspection and repair of the apparatus can be easily performed from the pond, facilitating the maintenance and management of the apparatus, and stopping the lifting of sand and sieve. Dust removal equipment that can easily resume work even if sewage containing a large amount of gravel due to heavy rain, typhoon, etc. flows in and accumulates in the lower part of this dust removal equipment, and sand settling And it aims at providing the removal method of a sieve residue.

The above problems are solved by the following invention.
[1] a screen for removing sieve residue from running water;
A pair of endless chains provided on both sides of the screen in the width direction, and links constituting the chain are rotatably connected to a predetermined angle only in one direction;
A scraping plate connected to the pair of endless chains, and with the rotation of the pair of endless chains, the sand settled on the bottom of the water channel at the bottom of the screen and the screen trapped by the screen;
A drive sprocket provided on the water surface above the endless chain, for driving the endless chain;
A support means for supporting a part of the chain inside the endless chain descending side;
A dust removing apparatus comprising: a position adjusting unit that displaces the position of the supporting unit to adjust a height position of the lowermost end of the endless chain.
[2] In the above [1], the support means is configured to be rotatable about the drive shaft of the drive sprocket,
A dust removing device, wherein the position adjusting means displaces the position of the supporting means by rotating around the fulcrum.
[3] A method for removing sand sediment and sieve residue in a water channel using the dust removing device according to [1] or [2],
When stopping the sedimentation and sieving scraping operation, the position of the support means for supporting a part of the chain inside the endless chain descending side is displaced from the working position, and the position of the bottom end of the endless chain is set to a predetermined height from the bottom of the waterway. Pull it up to the position,
A method for removing sand settling and sieve residue in a water channel, wherein the position of the support means is returned to the work position at the start of work after stopping.
[4] In the above [3], after the work is started after the stop, the height position of the lower end of the endless chain is substantially the same as the accumulated height of the sedimentation sand deposited on the bottom of the water channel until the position of the support means returns to the work position. The method of removing sand sediment and sieve residue in a waterway is characterized in that the operation is performed while adjusting the position of the support means.

  According to the present invention, inspection and repair of the apparatus can be easily performed from the pond, facilitating the maintenance and management of the apparatus, and a large amount of heavy rain, typhoon, etc. during suspension of the sedimentation and phlegm scraping operations. Provided are a dust removal device capable of easily resuming work even when sewage containing sand and gravel flows in and this gravel deposit accumulates in the lower part of the dust removal device, and a method for removing sedimentation and sieving. .

  Hereinafter, an example of the best mode for carrying out the present invention will be described.

  FIG.1 and FIG.2 is a schematic block diagram which shows one Embodiment of the dust removal apparatus which concerns on this invention. FIG. 1 is a schematic configuration diagram viewed from the lateral direction of the water channel, and FIG. 2 is a schematic configuration diagram viewed from the front of the water channel. In addition, the structure etc. which are not the essential part of this invention apparatus are abbreviate | omitting illustration.

  As shown in FIGS. 1 and 2, the dust removing apparatus according to the present invention includes a screen 1 for removing sieve residue from running water, and links provided on both sides of the screen 1 in the width direction and constituting a chain. A pair of endless chains 2 connected to be pivotable to a predetermined angle only in one direction, and both ends thereof are connected to the pair of endless chains 2, respectively, and with the rotation of the pair of endless chains 2 A scraping plate 3 for scooping up the sand sediment deposited on the bottom of the water channel at the bottom of the screen 1 and the sieve trap captured by the screen 1, and a water surface above the endless chain 2; A driving sprocket 4 for driving, a supporting means 5 for supporting a part of the chain inside the endless chain 2 descending side, and a position of the endless chain 2 by adjusting the position of the supporting means 5 It is displaced, in which a position adjusting means 6 which allow adjusting the height position of the endless chain 2 lowermost.

  Here, as the screen 1, for example, a bar screen or the like can be used. By installing the screen 1 so as to block the water channel, the screen residue in the flowing water passing through the water channel can be captured by the screen 1 and removed from the flowing water. In addition, although there is no restriction | limiting in particular in the installation method of the said screen 1, as shown in FIG. 1, it is preferable to incline with a slight angle, for example, an angle of about 75 degrees, from the perpendicular direction to the water flow direction.

  The endless chain 2 is provided on the both sides in the width direction of the screen 1 as a pair in the vertical direction along the end portion on the screen 1 side. The track of the endless chain 2 is held by a rail or the like (not shown) so as to rotate in a plane orthogonal to the screen 1.

  The link constituting the chain 2 is configured to be rotatable to a predetermined angle only in one direction at each connecting portion. For example, in a chain formed by alternately connecting two types of links, that is, an outer link and an inner link, the inner edge and the outer edge of the outer link are provided with locking portions projecting sideways, and the longitudinal direction of the inner link. A shape that engages with the engaging portion of the outer edge when both links are refracted inward at a predetermined angle at both ends, and engages with the engaging portion of the inner edge when both links are linear. This can be achieved by providing a projecting portion.

  The movement of the endless chain 2 will be described in more detail with reference to FIG. At both ends in the longitudinal direction of the inner link 21 of the endless chain 2, a projecting portion 22 is provided so as to form a long trapezoid when viewed from the side, and the outer link 23 connected to the inner link 21 has A locking portion 24 that engages with the projecting portion 22 is provided so as to protrude laterally from the inner edge and the outer edge thereof. As shown in FIG. 3, the inner link 21 and the outer link 23 are inwardly directed between 0 degree and a predetermined angle (α degree) by the interaction between the projecting part 22 and the locking part 24. It can only be refracted. That is, when both links are linear, the lower side of the trapezoidal contact portion 22 of the inner link 21 comes into contact with the engaging portion 24 of the inner edge of the outer link 23, and both links are refracted inward by α degrees. Sometimes, the trapezoidal hypotenuse part of the projecting part 22 is formed so as to abut against the locking part 24 at the outer edge.

  The structure of the endless chain 2 is not limited to the above structure, and the links constituting the chain 2 are configured to be rotatable to a predetermined angle only in one direction at each connecting portion. The present invention can be applied to the present invention.

  Both ends of the scraper plate 3 are connected to the pair of endless chains 2, and as the pair of endless chains 2 rotate, the sand settled on the bottom of the water channel below the screen 1 and the screen 1 Scrape the sieve trapped in Both ends of the scraper plate 3 constitute the endless chain 2 such that the lateral surface of the plate-like member protrudes in a direction substantially orthogonal to the traveling direction of the endless chain 2 and toward the outside. Connected to the link. In addition, it is preferable to provide a nail | claw part in the outer end edge of the said scraper board 3 in order to carry out the sifting of a sieve residue and sand sediment efficiently.

  The scraper plate 3 is attached to the endless chain 2 at a predetermined interval, but the number of attachments and the attachment interval can be appropriately changed in consideration of the operation status, the installation location, and the like.

  Further, the scraper plate 3 can be constituted by, for example, a bucket and a rake, or a rake also serving as a bucket.

  The drive sprocket 4 is rotated by a reduction gear motor or the like, and drives the pair of endless chains 2. Here, the drive sprocket 4 is provided on the water surface above the endless chain 2. By providing the drive sprocket 4 on the water surface, it is possible to prevent wear due to sand settling and the like, and the drive unit can be easily inspected and repaired from the pond.

  1 and 2 show a case where only one set of the drive sprocket 4 is provided on the upper part of one endless chain, but the number of sprockets is not limited to one set. Two or more pairs may be provided for the pair of left and right endless chains, at least one of which may be a driving sprocket, and the other may be a driven sprocket or a guide roller. Even when two or more sets are provided, each sprocket is preferably provided on the water surface for maintenance.

  The support means 5 supports a part of the chain inside the endless chain 2 descending side. Here, as the support means 5, for example, a guide rail 5 that supports a part of the inside of the descending chain as shown in FIG. 1 can be used. In addition to the guide rail as shown in FIG. 1, for example, the support means 5 is an arm-shaped support member 5a that supports a part of the inner side of the descending chain as shown by a dotted line in FIG. Can also be used. Further, as the support means 5, a guide roller (not shown) using a pulley can be used instead of the guide rail as shown in FIG.

  Further, the support means 5 is displaced by changing the position of the support means 5 to displace the track of the endless chain 2 so that the height position of the lowermost end of the endless chain 2 can be adjusted. Is attached.

  Examples of the position adjusting means 6 include an electric cylinder, a hydraulic cylinder, a pneumatic cylinder, an electric ball screw, a wire rope and a winding drum, a wire rope and a cylinder, a rack and a pinion, a transmission roller chain and a sprocket, and a link mechanism. Any one or a combination of them can be used, and the position can be displaced by attaching them to the support means 5.

  Here, when the guide rail 5 that supports a part of the lower chain inside as shown in FIG. 1 is used as the support means 5, the guide rail 5 serves as a drive shaft of the drive sprocket 4. It is preferable that the fulcrum is configured to be rotatable. Furthermore, in such a configuration, the position adjusting means 6 is attached so as to displace the position of the guide rail 5 by turning around the drive shaft of the drive sprocket 4 as the fulcrum.

  With such a configuration, the endless chain 2 sent out from the drive sprocket 4 is smoothly guided to the guide rail 5, and troubles such as chain detachment can be prevented in advance.

  Further, when an arm-shaped support member 5a as shown by a dotted line in FIG. 1 is used as the support means 5, the support member 5a is used as the position adjustment means 6, for example, an electric cylinder, a hydraulic cylinder, an empty cylinder. Pressure cylinder, electric ball screw, wire rope and take-up drum, wire rope and cylinder, rack and pinion, transmission roller chain and sprocket, link mechanism, or a combination of them can be configured to be displaceable Can be used.

  In the apparatus configuration as described above, by driving the drive sprocket 4, the pair of endless chains 2 rotate in a substantially oval shape in conjunction with each other. In FIG. 1, by driving the drive sprocket 4 counterclockwise toward the paper surface, the endless chain 2 descends on the support means 5 and is bent near the bottom of the water channel, along the screen 1. Ascend and return to the drive sprocket 4 to rotate repeatedly. At this time, the scraper plate 3 attached to the endless chain 2 rises while scooping up the sand sediment deposited on the bottom of the water channel at the bottom of the screen 1 and the sieve trapped by the screen 1.

  At the bent portion of the endless chain 2 located near the bottom surface of the water channel, the trapezoid oblique side portion of the projecting portion 22 of the inner link 21 engages with the engaging portion 24 of the outer edge of the outer link 23 as shown in FIG. Then, the light is refracted by α degrees, and the subsequent links are also refracted in the same manner, so that the whole can smoothly bend and rotate while drawing an arc having a diameter d as a whole without providing a sprocket or the like in the water.

  As described above, in the present invention, except for the endless chain 2, there is no mechanical part in the underwater part, so that daily inspections and repairs can be easily performed from the pond.

  The endless chain 2 bent near the bottom surface of the water channel rises along the screen 1. Here, the endless chain 2 is guided by a rail, which is a support member (not shown), and the scraper 3 is slidably in contact with the screen 1. Ascending at intervals.

  Here, when the sand settling and the sieve cake swept up by the scraping plate 3 are reversed by the drive sprocket 4, for example, they fall into a running water trough 10 provided below the drive sprocket 4 to be conveyed. Is done. As such a transporting means, the running water trough can transport the settling sand and the sieve residue without scattering, and thus is excellent for hygienically transferring the settling sand and the sieve residue. However, the conveying means is not limited to the running water trough, and may be a screw conveyor, a flight conveyor, or the like.

  In the operation in the steady state, the position of the bent portion of the endless chain 2 located near the bottom surface of the water channel is supported by the position adjusting means 6 so that the scraper 3 secures a predetermined clearance from the bottom surface of the water channel. It is adjusted by adjusting the position of the means 5.

  The position of the support means 5 in such a steady state is called a work position.

  The method for removing sand settling and sieving in a water channel according to the present invention includes the position of the support means 5 that supports a part of the inner side of the chain on the lowering side of the endless chain 2 when the sanding and sieving scraping operation is stopped. It is displaced from the working position, the position of the lowermost end of the endless chain 2 is pulled up to a predetermined height position from the bottom of the water channel, and the position of the support means 5 is returned to the working position at the start of work after stopping. Is.

  The time when the sanding and sieving work is stopped is generally at the end of a day's work, but other cases are also applicable when the work is stopped for a long time, for example several hours or more. To do.

  The predetermined height position from the bottom surface of the water channel means a height position equal to or higher than the sedimentation height of sedimentation sediment deposited on the bottom of the water channel at the lower part of the screen 1 while the operation is stopped, and is determined by an operation record or the like. When it is expected that sewage containing a large amount of gravel will flow in due to torrential rain, typhoon, etc., the predetermined height position is high considering the effects of torrential rain, typhoon, etc. It is corrected in the direction to do.

  This makes it possible to easily resume work even when sewage containing a large amount of gravel due to heavy rain or a typhoon flows during the work stoppage, especially when the work is stopped. .

  At the start of work after stopping, the position of the support means 5 is returned to the work position. Here, when sedimentation has accumulated at the bottom of the water channel at the bottom of the screen 1, the endless chain 2 bends at a position in contact with the sedimentation. In this state, the driving sprocket 4 is rotated to drive the endless chain 2, so that the sand settling on the bottom of the water channel is gradually removed, and eventually the bent portion of the endless chain 2 is positioned at the steady state position. Will return.

  Here, after the work is started after the stop, the height position of the lowermost end of the endless chain 2 is substantially the same as the accumulated height of the sediment deposited on the bottom of the water channel until the position of the support means 5 returns to the work position. It is preferable to work while adjusting the position of the support means 5 as described above. That is, at the start of work after stopping, the position of the support means 5 is adjusted so that the position of the lowermost end of the endless chain 2 is in contact with the sand sediment accumulated on the bottom of the water channel, and then the endless chain 2 is driven, The position of the support means 5 is gradually lowered according to the height of the sedimentation sediment deposited on the bottom of the water channel, and the position adjustment is performed until the position of the support means 5 returns to the working position. In addition, as a method of measuring the sedimentation height of the sedimentation sediment deposited on the bottom of the water channel, for example, a detection means such as a sludge interface meter may be used.

  In this way, by adjusting the height position of the lowermost end of the endless chain 2 so as to be substantially the same as the height of sedimentation deposited on the bottom of the water channel, the weight of the endless chain 2 is the contact portion with the sandfall. It will not take. As a result, it is possible to scrape the sand settled on the bottom of the water channel in order from the top without any overload, so that it is possible to more efficiently remove the sand settled and the sieve residue.

  FIG. 4 is a schematic configuration diagram showing another embodiment of the dust removing device according to the present invention, and is a schematic configuration diagram seen from the lateral direction of the water channel. In addition, like FIG.1 and FIG.2, the structure etc. which are not an essential part of this invention apparatus are abbreviate | omitting illustration.

  In the example shown in FIG. 4, in addition to the drive sprocket 4, a driven sprocket 7 is separately provided on the water surface above the endless chain 2 in the apparatus configuration of FIG. 1. Here, since the other components are the same as those in FIGS. 1 and 2, the same numbers are assigned and the description thereof is omitted. In addition, the removal method of the sand settling in a water channel and a sieve residue using the apparatus shown in FIG. 4 is the same as that of the case of FIG.1 and FIG.2. Here, the driven sprocket 7 does not have a power source and rotates according to the movement of the chain 2.

  In FIG. 4, a driven sprocket 7 is provided on the drive sprocket 4 entering the endless chain 2, that is, on the upstream side in the rotation direction of the endless chain 2. As shown in FIG. 4, by providing the driven sprocket 7 on the upstream side in the rotational direction of the chain 2 of the drive sprocket 4, tension is always applied to the chain 2 on the driven sprocket 7 entering side. The effect of preventing the detachment of 2 is further increased. This is because the engagement between the chain 2 and the driven sprocket 7 is more reliably performed. However, it is not always necessary to provide the driven sprocket 7 on the upstream side in the rotational direction of the endless chain 2 with respect to the drive sprocket 4, and can be appropriately changed depending on the device configuration and the arrangement of individual members.

  In addition, by setting it as the structure shown in FIG. 4, it becomes possible to ensure the installation space of the flowing water trough 10 widely compared with the case of FIG. 1, for example, and the flowing water trough 10 is installed in a more efficient position. It becomes possible to do. Further, by providing the driven sprocket 7, the installation angle of the guide rail 5 as the support means 5 can be made more vertical than in the case of FIG. As a result, it is possible to perform the displacement of the position of the guide rail 5 by the position adjusting means 6 with less force, the load on the position adjusting means 6 can be reduced, and the installation cost and operating cost due to the downsizing of the apparatus can be reduced. It has the merit that reduction can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows one Embodiment of the dust removal apparatus which concerns on this invention, and is a schematic block diagram seen from the horizontal direction of the water channel. It is a schematic structure figure showing one embodiment of a dust removing device concerning the present invention, and is a schematic structure figure seen from the front of a waterway. It is explanatory drawing for demonstrating the motion in the bending part of the endless chain which comprises the dust removal apparatus which concerns on this invention. It is a schematic block diagram which shows other embodiment of the dust removal apparatus which concerns on this invention, and is a schematic block diagram seen from the horizontal direction of the water channel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen 2 Endless chain 21 Inner link 22 Projection part 23 Outer link 24 Locking part 3 Scraping plate 4 Drive sprocket 5 Support means (guide rail)
6 Position adjustment means 7 Driven sprocket 10 Flowing trough

Claims (4)

A screen for removing sieve residue from running water;
A pair of endless chains provided on both sides of the screen in the width direction, and links constituting the chain are rotatably connected to a predetermined angle only in one direction;
A scraping plate connected to the pair of endless chains, and with the rotation of the pair of endless chains, the sand settled on the bottom of the water channel at the bottom of the screen and the screen trapped by the screen;
A drive sprocket provided on the water surface above the endless chain, for driving the endless chain;
A support means for supporting a part of the chain inside the endless chain descending side;
A dust removing apparatus comprising: a position adjusting unit that displaces the position of the supporting unit to adjust a height position of the lowermost end of the endless chain. The support means is configured to be rotatable about the drive shaft of the drive sprocket,
2. The dust removing apparatus according to claim 1, wherein the position adjusting means displaces the position of the support means by rotating around the fulcrum. A method for removing sand sediment and sieve residue in a water channel using the dust removing device according to claim 1,
When stopping the sedimentation and sieving scraping operation, the position of the support means for supporting a part of the chain inside the endless chain descending side is displaced from the working position, and the position of the bottom end of the endless chain is set to a predetermined height from the bottom of the waterway. Pull it up to the position,
A method for removing sand settling and sieve residue in a water channel, wherein the position of the support means is returned to the work position at the start of work after stopping.   After starting the work after stopping, the position of the support means is adjusted so that the height position of the bottom end of the endless chain is substantially the same as the sedimentation height of the sediment deposited on the bottom of the channel until the position of the support means returns to the work position. 4. The method for removing sand settling and sieve residue in a water channel according to claim 3, wherein the operation is performed while adjusting.

Images