JP2013096204A - Dust remover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust remover capable of making screen residues flow downstream without catching them with a screen when emergency flooding of heavy rainfall or the like occurs.SOLUTION: A dust remover 1 includes: a coarse screen 2; a fine screen 3 installed in parallel with the coarse screen 2 on the downstream side of the coarse screen 2, whose upper end is positioned lower than an upper end of the coarse screen 2; an endless chain 7 disposed in a track shape along the coarse screen 2 and the fine screen 3; a coarse rake (rake 5) for raking a front surface of the coarse screen 2 in an upper direction; and a fine rake (rake 5) for raking a front surface of the fine screen 3 in a lower direction. When a water level rises above the upper end of the fine screen 3 when the emergency flooding occurs, the screen residues that pass through the coarse screen 2 flow downstream as they are from an upper space of the fine screen 3.

Description

  The present invention relates to a dust remover that is installed in a sewage treatment facility or the like and removes dust (hereinafter referred to as residue) in a water channel.

  The thing of patent document 1 as a back surface descent | floating front surface raising type dust remover provided with the front screen in which a lower end is spaced apart from the bottom part of a water channel, and the rear screen installed in the downstream of this front screen is provided. Can be mentioned. The lower end of the front screen is spaced from the bottom of the water channel to ensure a rake passage space. The residue passing between the lower end of the front screen and the bottom of the water channel is captured by the rear screen.

  In Patent Document 1, a guide plate and an intermediate screen are provided between the front screen and the rear screen, and any rake is always positioned between the guide plate and the upper end of the intermediate screen, so that any screen residue is provided. It relates to technology to capture by rake.

  Patent Document 2 describes a technique in which a movable auxiliary screen is provided between the lower end of the main screen and the bottom of the water channel, and this auxiliary screen prevents passage of screen residue.

Japanese Patent Publication No. 7-887 JP 2002-167735 A

Since the techniques of Patent Documents 1 and 2 are techniques for preventing the passage of the residue regardless of the size of the residue, a fine screen is provided, and the amount of inflow of sewage due to heavy rain is very high. When the amount increases, clogging of the residue trapped on the screen is not in time, and clogging occurs due to the fine residue, and the upstream water level may rise from the downstream side and the sewage may overflow. For this reason, in an emergency such as heavy rain, there is a case where a process of flowing upstream sewage downstream is required.
However, the techniques of Patent Documents 1 and 2 do not have any function of flowing a fine screen residue that causes clogging at the time of water increase without capturing it with a screen.

  Further, as a problem of the technology for catching residue, the technology of Patent Document 1 has a structure in which any rake is always positioned between the guide plate and the upper end of the intermediate screen, and therefore, the rake mounting pitch is limited. There is a problem of receiving. In the technique of Patent Document 2, since the auxiliary screen is disposed around the bottom of the water channel, the auxiliary screen is buried in the sandy mud residue collected at the bottom of the water channel, and the left screen remains attached to the auxiliary screen. The auxiliary screen may solidify and the smooth movement of the auxiliary screen may not be maintained. Further, in the technique of Patent Document 2, since the rake teeth pass between the teeth of the auxiliary screen, if the sludge is solidified on the auxiliary screen, the rake teeth may be bitten and damaged. .

  The present invention was created to solve such problems, and provides a dust remover that can flow downstream without catching fine screen residue on a screen when there is an extreme increase in water such as heavy rain. Objective. Furthermore, the purpose is to provide a dust remover that is not subject to the restrictions of the rake mounting pitch and that is less susceptible to sand and mud residue collected at the bottom of the water channel, for example, when capturing residue with a screen at normal water levels. And

  In order to solve the above problems, a dust remover according to the present invention is provided with a coarse screen whose lower end is set apart from the bottom of the water channel, and is installed on the downstream side of the coarse screen in parallel with the coarse screen, and the upper end is a coarse screen. A fine screen positioned lower than the upper end of the screen, an endless chain disposed in a track shape along the coarse screen and the fine screen, and attached to the endless chain, and scraping the front of the coarse screen upward A coarse rake for frying, and a fine rake that is attached to the endless chain and scrapes the front of the fine screen downward, and when the water level rises from the upper end of the fine screen when the water level increases, the coarse screen is Passed and the residue flows downstream from the space above the fine screen. That.

  According to this dust remover, when there is an extreme increase in water due to heavy rain or the like, the dust that has passed through the coarse screen flows directly downstream from the space above the fine screen. Since the coarse screen is formed coarse, the screen is less likely to be clogged, thereby ensuring the flow of sewage in the water channel.

  The dust remover according to the present invention is provided between the coarse screen and the fine screen, shields screen residue between the coarse screen, and the coarse rake and fine rake between the fine screen. And an intermediate shield that forms a residue catching path, and when the coarse rake and the fine rake pass through the residue catching path, retreats behind the fine screen, and passes through the coarse rake and the fine rake. And a lid screen that protrudes from the opening portion of the fine screen to the residue catching path and closes the residue catching path.

According to this dust remover, in order to prevent the residue from flowing out after passing under the coarse screen, the residue can be prevented from flowing out by the lid screen even when the rake is not positioned in the residue catching path. Accordingly, it is not necessary to always place the rake in the residue catching path, and the rake attachment pitch can be set larger than that of the conventional one without being restricted by the rake attachment pitch in the endless chain.
The lid screen is retracted to the back of the fine screen when the rake passes, and after the rake, the lid screen protrudes from the fine screen opening to the residue catching path, so that the sand mud collected at the bottom of the water channel Not affected. Therefore, the smooth movement of the lid screen is maintained over a long period of time, and the rake is not damaged by the biting of teeth caused by sludge.

  Further, in the dust remover according to the present invention, the movable mechanism of the lid screen is integrally attached to the first cam member attached to the endless chain and the lid screen, and is operated by contact and separation with the first cam member. And a cam mechanism including the second cam member.

  According to this dust remover, the lid screen can be interlocked and opened with a simple structure with respect to the movement of the rake.

  In the dust remover according to the present invention, the lid screen is retracted to the rear of the fine screen when the first cam member presses the second cam member, and the first cam member is the second cam. When separated from the member, it protrudes into the residue catching path by gravity.

  According to the dust remover, the lid screen can be further opened and closed with a simple structure with respect to the movement of the rake.

  Moreover, the dust remover according to the present invention is characterized in that the coarse rake and the fine rake are formed as an integrally molded product.

  According to this dust remover, it is possible to reduce the number of parts and improve the assembly work by making the coarse rake and the fine rake into an integrally molded product.

According to the present invention, at the time of emergency water increase due to heavy rain or the like, it is possible to flow downstream without capturing fine screen residue with a screen. Thereby, clogging of the screen does not occur, and the flow of sewage in the water channel at the time of emergency water increase is ensured.
Also, for example, in order to prevent the residue from flowing out when passing under the coarse screen at the normal water level, the lid screen can prevent the residue from flowing out even when the rake is not positioned in the residue catching path. No restrictions on rake mounting pitch. In addition, the smooth movement of the lid screen is maintained for a long time without being affected by sand mud accumulated at the bottom of the water channel, and the rake is not damaged by the biting of teeth caused by sludge.

BRIEF DESCRIPTION OF THE DRAWINGS It is whole explanatory drawing of the dust remover which concerns on 1st Embodiment of this invention, (a), (b) is a side view and a front view, respectively. It is AA sectional drawing in FIG. It is whole explanatory drawing of the dust remover which concerns on 2nd Embodiment of this invention, (a), (b) is a side view and a front view, respectively. It is drawing of 2nd Embodiment of this invention, and is a partial side view around a lid screen. It is drawing of 2nd Embodiment of this invention, and is a front view around a lid screen. It is drawing of 2nd Embodiment of this invention, (a), (b) is a side action figure of a dust remover.

“First Embodiment”
In FIG. 1 (a), (b), the dust remover 1 is installed in the water channel which shows a rectangular cross section. The dust remover 1 is installed at the bottom of the water channel in parallel with the coarse screen 2 on the downstream side of the coarse screen 2 at the lower end of the coarse screen 2 so as to pass the rake 9 which will be described later. The fine screen 3 has an upper end positioned lower than the upper end of the coarse screen 2. The coarse screen 2 has a configuration in which a plurality of vertical screen bars 2A are arranged in parallel in the channel width direction at coarse intervals, and the fine screen 3 similarly has a plurality of vertical screen bars 3A in the channel width direction with fine intervals. It consists of the configuration arranged side by side.

  An opening 4 is provided in the ceiling of the water channel, and the upper portion of the coarse screen 2 extends through the opening 4 to a section on the ceiling. A side view is provided between a drive sprocket 5 having an axial direction in the direction of the water channel installed in a section on the ceiling and a driven sprocket 6 having an axial direction in the direction of the water channel installed below the coarse screen 2. Thus, the endless chain 7 is wound around in a track shape so as to have a pair of linear tracks along the front surface of the coarse screen 2 and the front surface of the fine screen 3. The endless chain 7 circulates in the clockwise direction in FIG. The drive sprocket 5, the driven sprocket 6 and the endless chain 7 are disposed as a pair on both sides of the coarse screen 2. A guide roller (not shown) is attached to the endless chain 7 with a space therebetween, and this guide roller is guided by a guide rail (not shown) so that the movement trajectory of the endless chain 7 is maintained.

  The fine screen 3 is formed in an arc shape around the lower end thereof in accordance with the arc locus of the endless chain 7 on the driven sprocket 6. The position of the upper end of the fine screen 3 is a position that protrudes slightly from the normal water level L1.

  A rake 9 is attached to the endless chain 7 through a bracket 8 at a predetermined pitch (at least one rake is always positioned in the residue catching path 12 as will be described later). The bracket 8 is, for example, a channel steel having a U-shaped side section, and the rake 9 is fixed to one flange of the channel steel. The rake 9 is formed of a substantially rectangular flat plate member, and comb-shaped teeth 9A and 9B are formed on one end side and the other end side in the water channel direction as shown in FIG. The teeth 9 </ b> A are teeth that are inserted into the coarse openings of the coarse screen 2 and have a large tooth width. The teeth 9 </ b> B are teeth that are inserted into the fine openings of the fine screen 3 and have a small tooth width.

  As the endless chain 7 (FIG. 1) circulates, the rake 9 moves upward in a state where the teeth 9A are inserted into the opening portions of the coarse screen 2, thereby scooping up the residue on the front surface of the coarse screen 2. The scraped residue is put into a hopper 10 (FIG. 1) arranged in a section on the ceiling. Further, the rake 9 moves downward with the teeth 9 </ b> B inserted into the opening portions of the fine screen 3, thereby scraping off the residue on the front surface of the fine screen 3. The scraped residue is captured by the rake 9 as it is, and then passed through the front surface of the coarse screen 2 and put into the hopper 10 (FIG. 1). As can be seen from the above, the rake 9 functions as a coarse rake that lifts the front surface of the coarse screen 2 upward by the teeth 9A, and functions as a fine rake that scrapes the front surface of the fine screen 3 downward by the teeth 9B. And have. That is, in the present embodiment, the coarse rake and the fine rake are configured as an integrally molded product.

  As shown in FIG. 1, an intermediate shield 11 is provided between the coarse screen 2 and the fine screen 3. The intermediate shield 11 shields the residue from the coarse screen 2, and allows the rake 9 to pass between the fine screen 3, and passes the residue below the coarse screen 2. A residue catching path 12 for catching is formed.

  The intermediate shield 11 includes a cover plate 13 and an intermediate screen 14. The intermediate screen 14 has a configuration in which a plurality of vertically-drawn screen bars 14 </ b> A are juxtaposed in the water channel width direction, and is provided in parallel to the coarse screen 2 and the fine screen 3. The screen bars 14 </ b> A are arranged side by side at the same intervals as the openings of the screen bars 2 </ b> A of the coarse screen 2, that is, with coarse intervals. The teeth 9 </ b> A of the rake 9 are inserted through the opening of the intermediate screen 14. The lower end of the intermediate screen 14 is positioned at substantially the same height as the lower end of the coarse screen 2, and the upper end of the intermediate screen 14 protrudes slightly from the normal water level L 1 and is slightly higher than the upper end of the fine screen 3. It is in. A rectangular flat plate 13 covering the entire width of the water channel is attached between the upper end of the intermediate screen 14 and the coarse screen 2. As described above, the residue passing under the coarse screen 2 is blocked by the cover plate 13 and flows into the residue catching path 12 without flowing out between the coarse screen 2 and the intermediate screen 14. Since at least one of the plurality of rakes 9 is always located in the residue catching path 12, the residue flowing into the residue catching path 12 is reliably captured by the rake 9.

"Action"
As shown in FIG. 1, at the normal water level L <b> 1, the upper end of the fine screen 3 is located above the normal water level L <b> 1, so that all the residue is captured by the fine screen 3.
The residue captured by the fine screen 3 becomes larger during the movement of the rake 9, is captured by the coarse screen 2 on the upstream side, and is discharged to the hopper 10.
Then, at the increased water level L2 at the time of emergency increase due to heavy rain or the like, the residue that has passed through the coarse screen 2 flows directly downstream from the space above the fine screen 3.

  In a conventional dust remover, the upstream screen and the downstream screen are set at the same opening, and so on the function of trapping residue, so to speak, both the upstream screen and the downstream screen It can be said that the “fine screen” of the invention is arranged. On the other hand, according to the present invention, since the upstream coarse screen 2 is formed coarse, clogging of the screen is reduced at the time of emergency water increase, and the flow of sewage in the water channel is ensured. The opening size of the coarse screen 2 is appropriately set for each water channel in consideration of the size of the residue that is desired to flow as it is when the water increases in an emergency.

“Second Embodiment”
A second embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same component as 1st Embodiment, and the description is abbreviate | omitted. The dust remover 1 of the second embodiment is retracted to the rear of the fine screen 3 when the rake 9 passes through the residue catching path 12, and after passing through the rake 9, the dust remover 1 moves from the opening of the fine screen 3 to the residue catching path 12. A lid screen 15 that protrudes and closes the residue catching path 12 is provided. The movable mechanism of the lid screen 15 of this embodiment includes a cam mechanism. This cam mechanism is composed of a first cam member attached to the endless chain 7 and a second cam member attached integrally to the lid screen 15 and operated by contact with and separation from the first cam member. In the second embodiment, the rake 9 does not necessarily have to be positioned in the residue catching path 12, and the mounting pitch can be larger than that in the first embodiment.

  Specifically, as shown in FIGS. 4 and 5, the lid screen 15 has a configuration in which a plurality of arc-shaped screen bars 15 </ b> A are arranged in parallel in the water channel width direction. The screen bar 15A is positioned so that its convex side faces the bottom of the water channel, and is integrated by connecting each downstream end with a connecting member 16 extending in the water channel width direction. The lid screen 15 rotates around the rotation shaft 17 whose axial direction is the water channel width direction. The rotary shaft 17 is located above and downstream of the upper end of the fine screen 3. The screen bar 15A is formed so that the radius of curvature from the rotating shaft 17 is constant.

  As the cam mechanism, a cam striker 19 as a first cam member is attached to the endless chain 7 via an attachment 18, and cam plates 20 as second cam members are attached to both ends of the connecting member 16. . A cam striker 19 is located beside each rake 9. An upper end of the cam plate 20 is attached to be rotatable around the rotation shaft 17 provided on the side wall of the water channel. The cam plate 20 is a flat plate member having a substantially triangular shape when viewed from the side, and one side thereof forms a cam surface 20A having a concave curve. The lid screen 15 and the cam plate 20 are rotated together around the rotary shaft 17 by the connecting member 16.

  A weight 21 is integrally attached to the cam plate 20. The weight 21 always urges the lid screen 15 to protrude into the residue catching path 12. As shown in FIG. 5, the cam plate 20 and the weight 21 are provided on one side, but may be provided on both sides.

"Action"
The action of suppressing clogging of the screen at the time of emergency water increase is the same as that of the first embodiment. That is, at the increased water level L 2, the residue that has passed through the coarse screen 2 flows directly downstream from the space above the fine screen 3.

The action of trapping the residue in the residue capturing path 12 is as follows. As shown in FIG. 4, when the rake 9 is not positioned in the residue catching path 12, the cam plate 20 is not in contact with the cam striker 19, so that the lid screen 15 is shown in FIG. In this way, the fine screen 3 protrudes from the opening portion of the fine screen 3 to the residue trapping path 12. The periphery of the tip of the lid screen 15 is inserted into the opening of the intermediate screen 14.
As a result, the screen catching path 12 is surrounded by the intermediate screen 14, the fine screen 3 and the lid screen 15 to form a bag path, and the screen residue passing below the coarse screen 2 is transferred to the intermediate screen 14, the fine screen 3, and the lid. The screen 15 is captured by any of the screens 15 to prevent the residue from flowing downstream.

  Next, when the rake 9 enters the residue catching path 12, the cam striker 19 presses the cam surface 20A of the cam plate 20 against the urging force of the weight 21 as shown in FIG. The screen 15 rotates counterclockwise about the rotation shaft 17, and the cover screen 15 is retracted to the rear of the fine screen 3 to avoid interference with the rake 9 as shown in FIG. To do. The residue trapped by any of the intermediate screen 14, the fine screen 3 and the lid screen 15 is scraped off by the rake 9. Specifically, the residue that has been captured by the lid screen 15 is moved to the fine screen 3 side when the lid screen 15 is retracted, or floats in the residue capture path 12. The rake 9 captures the residue suspended in the residue collection path 12, and the teeth 9A and 9B are respectively inserted into the openings of the intermediate screen 14 and the fine screen 3 to scrape the residue. The scraped residue is captured by the rake 9 as it is, and then passed through the front surface of the coarse screen 2 and put into the hopper 10 (FIG. 3A). After the rake 9 has passed, the cam striker 19 is separated from the cam plate 20, and the lid screen 15 protrudes again from the opening portion of the fine screen 3 into the residue catching path 12 by the gravity action of the weight 21 as shown in FIG. .

  As described above, the screen is provided between the coarse screen 2 and the fine screen 3, shields residue from the coarse screen 2, and allows the rake 9 to pass between the fine screen 3 and the residue capture path 12. The intermediate shield 11 (cover plate 13 and intermediate screen 14) that forms the screen and retracts to the back of the fine screen 3 when the rake 9 passes through the residue catching path 12, and the fine screen 3 is opened after the rake 9 passes. When the dust remover 1 includes a lid screen 15 that protrudes from the section and protrudes into the residue catching path 12 and closes the residue catching path 12, the rake can be prevented from flowing out under the coarse screen 2. Even when 9 is not positioned in the residue catching path 12, the lid screen 15 can prevent the residue from flowing out. Accordingly, the rake 9 need not necessarily be positioned in the residue catching path 12, and the attachment pitch of the rake 9 can be set larger than, for example, the conventional one without being restricted by the attachment pitch of the rake 9 in the endless chain 7.

  The lid screen 15 is retracted to the rear of the fine screen 3 when the rake 9 passes, and after the rake 9 passes, the lid screen 15 protrudes from the opening portion of the fine screen 3 to the residue catching path 12, and the bottom of the water channel Not affected by sand and mud collected in Therefore, the smooth movement of the lid screen 15 is maintained over a long period of time, and the rake 9 is not damaged by the biting of teeth caused by sludge.

  Further, as a movable mechanism of the lid screen 15, the first cam member (cam striker 19) attached to the endless chain 7 and the lid screen 15 are attached integrally, and are brought into contact with and separated from the first cam member (cam striker 19). If the configuration includes a cam mechanism including the actuating second cam member (cam plate 20), the lid screen 15 can be interlocked and opened with a simple structure with respect to the movement of the rake 9.

  As in the present embodiment, the lid screen 15 is retracted to the rear of the fine screen 3 when the first cam member presses the second cam member, and when the first cam member is detached from the second cam member, gravity is applied. Thus, if the structure projects into the residue catching path 12, the lid screen 15 can be further opened and closed with a simple structure with respect to the movement of the rake 9.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to those described in the drawings, and various design changes can be made without departing from the spirit of the present invention.
In the described embodiment, the coarse rake that scrapes the front surface of the coarse screen 2 upward and the fine rake that scrapes the front surface of the fine screen 3 downward are formed from the integrally formed rake 9. The fine rake may be composed of separate members.

In the described cam mechanism, when the first cam member is detached from the second cam member, the lid screen 15 is projected by the gravity using the weight 21 and protrudes to the residue catching path 12. Thus, a structure may be provided in which a spring member that constantly biases the lid screen 15 to protrude in the residue catching path 12 is provided.
In the described cam mechanism, the first cam member is the cam striker 19 and the second cam member is the cam plate 20, but conversely the first cam member is the cam plate 20 and the second cam member is the cam striker 19. It may be.

DESCRIPTION OF SYMBOLS 1 Dust remover 2 Coarse screen 3 Fine screen 7 Endless chain 9 Rake 10 Hopper 11 Intermediate shielding body 12 Screen residue path 13 Cover body 14 Intermediate screen 15 Cover screen 19 Cam striker 20 Cam plate 21 Weight

Claims (5)

A coarse screen, the lower end of which is set apart from the bottom of the waterway;
A fine screen that is installed downstream of the coarse screen in parallel with the coarse screen, and whose upper end is positioned lower than the upper end of the coarse screen;
An endless chain disposed in a track shape along the coarse screen and the fine screen;
A coarse rake attached to the endless chain and scraping the front of the coarse screen upward;
A fine rake attached to the endless chain and scraping the front of the fine screen downward;
With
A dust remover characterized in that when the water level rises from the upper end of the fine screen during an emergency increase of water, the dust passes through the coarse screen and the residue flows downstream from the space above the fine screen. Provided between the coarse screen and the fine screen, shields residue from the coarse screen, and forms a residue catching path that allows the coarse rake and fine rake to pass through the fine screen. An intermediate shield to
When the coarse rake and the fine rake pass through the screen, the screen is retracted to the back of the fine screen, and after passing the coarse rake and the fine rake, the fine screen is opened from the opening portion of the fine screen to the screen. A lid screen that protrudes and closes the residue catching path;
The dust remover according to claim 1, comprising:   The movable mechanism of the lid screen is composed of a first cam member attached to the endless chain and a second cam member attached integrally to the lid screen and operated by contact with and separation from the first cam member. The dust remover according to claim 2, comprising:   The lid screen is retracted to the rear of the fine screen by the first cam member pressing the second cam member, and when the first cam member is detached from the second cam member, the screen is caused by gravity. The dust remover according to claim 3, wherein the dust remover protrudes into the catching path.   The dust remover according to any one of claims 1 to 4, wherein the coarse rake and the fine rake are integrally formed.

Images