JP2011052451A - Laterally-raking-type dust remover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce raking residue by a simple structure around a separation part where a rake-mounting part of a chain is moved onto a sprocket and a rake is separated from a screen. <P>SOLUTION: A laterally-raking-type dust remover 1 to be installed in a water channel includes the screen 3 comprising screen bars 3A arranged vertically in parallel, and the rake 8 attached to a drive chain 7 for raking the residue in a manner of passing through the screen bars 3A. The rake 8 is separated from the screen 3 on the way from a first passage S1, where the rake-mounting part 7A extends along the screen 3, to a second passage S2 on the drive sprocket 5. In the dust remover 1, a projection 18 is formed on the screen 3 as a rake-retreating means 17 to allow the rake 8 to retreat from a front edge 3B of the screen 3 when the rake-mounting part 7A is positioned on the first passage S1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a horizontal scraping dust remover installed in a sewage treatment plant or the like.

  A conventional example of a horizontal scraping type dust remover that captures residue with screen bars arranged in parallel in the vertical direction and scrapes the residue with a rake passing between the screen bars is disclosed in Patent Document 1. In this document, the rake is attached to a chain that is hung between sprockets, and the rake is separated from the screen in the process in which the rake attachment portion of the chain moves from the track along the screen to the track on the sprocket.

  When the rake is detached from the screen, a part of the residue remains scraped around the detached part. If this residue scraping residue gradually accumulates and compresses and solidifies and becomes clogged, it gives a large sliding resistance to the rake, and external force is applied to the meshing part of the chain and sprocket when the rake attachment part reaches the sprocket. May be added, and smooth engagement may be impaired.

  A conventional example of the technique for removing the scraping residue is disclosed in Patent Document 2. This document describes that a delivery mechanism having a delivery bar for forcibly removing the scraping residue from the screen is provided.

JP 2006-255582 A JP 2006-112142 A

  However, according to the technique described in Patent Document 2, since a feeding mechanism including a movable mechanism is required to remove the scraping residue from the screen, the number of components and the number of assembling steps increase, and the dust remover tends to be expensive. There is a problem.

  The present invention was created to solve such a problem, and the rake attachment portion of the chain moves onto the sprocket and the rake is separated from the screen. An object of the present invention is to provide a side-scraping dust remover that can be reduced by the structure.

  In order to solve the above problems, the present invention comprises a screen in which screen bars are arranged side by side, and a rake that is attached to a chain and passes between the screen bars and scrapes the residue. In the horizontal scraping type dust remover for water channel installation, the rake mounting portion of the chain has a configuration in which the rake is detached from the screen in the process from the first path along the screen to the second path on the sprocket. Rake evacuation means for evacuating the rake from the front edge of the screen when located in the first path is provided.

  According to this configuration, since the rake is retracted from the front edge of the screen when the rake mounting portion of the chain is located in the first path, the scraping residue of the residue is generated around the retracted portion, As a result, scraping residue of the residue around the separation portion where the rake separates from the screen is reduced. And even if sliding resistance is generated in the rake due to the remaining scraping around the retracted portion, the rake mounting portion of the chain is still not in contact with the sprocket, so it acts on the meshing portion between the sprocket and the chain. External force is small.

  Further, the present invention is characterized in that as the rake retracting means, a protrusion is formed at the front edge of the screen, and the protrusion hides the rake.

  By adopting a structure in which the protruding portion hides the rake, the rake retracting means has a simple structure, and the manufacturing cost of the side-scraping type dust remover can be suppressed.

  Further, according to the present invention, the protruding portion has a tapered portion in which a protruding amount from the front edge of the screen increases as it goes in the moving direction of the rake, and the tapered portion gradually hides the rake. It is characterized by that.

  Since the taper portion gradually hides the rake, the scraping residue of the residue is dispersed along the taper portion, so that the screen is not easily clogged.

  Further, the present invention is characterized in that as the rake retracting means, a part of the first path of the chain is kept away from the screen.

  According to this configuration, the screen having the existing shape can be used as it is, and it becomes an economical rake evacuation means.

  According to the horizontal scraping type dust remover according to the present invention, it is possible to reduce the scraping residue of the residue around the separation portion where the rake attachment portion moves onto the sprocket and the rake separates from the screen with a simple structure.

It is a top view of the side-scraping type dust remover according to the present invention. It is an AA arrow line view in FIG. It is BB sectional drawing in FIG. It is plane explanatory drawing which shows the structure of a screen. It is a perspective view which shows the protrusion part of a screen. It is a plane effect | action figure of the protrusion part of a screen. It is a plane explanatory view of the horizontal scratch type dust remover of the 1st modification. It is a plane explanatory view of the horizontal scratch type dust remover of the 2nd modification.

  The horizontal scratch type dust remover 1 according to the present invention has a horizontal screen bar 3A extending obliquely with respect to the water flow direction in plan view as shown in FIG. A so-called horizontally-drawn screen 3 is provided in parallel. 3 A of screen bars are comprised as a flat member, and are arrange | positioned so that a plate | board surface may become horizontal. A blocking plate 4 is applied between the vertical frame 16 that supports the upstream end of the both ends of the screen 3 and one side wall of the water channel. The downstream end of the screen bar 3 </ b> A is attached to a vertical shaft 15 that spans between the upper frame 10 and the lower frame 11. A gap formed between the downstream end of the screen 3 and the other side wall of the water channel is configured as a residue passage. As shown in FIG. 1, a residue crusher 2 is installed downstream of the passage. Is done.

  A drive sprocket 5 and a driven sprocket 6 are arranged around the downstream end of the screen 3 and the upstream end, respectively, with the vertical direction as the rotation axis direction, and the drive chain 7 is formed in a track shape between both sprockets. It is hung around. The first path S <b> 1 of the drive chain 7, which is a linear track, is parallel to the straight part of the screen 3. The drive sprocket 5, the driven sprocket 6, and the drive chain 7 are arranged as a pair of upper and lower as shown in FIG. 2, and a plurality of (three in the figure) rakes 8 are provided between the drive chains 7 and 7 as shown in FIG. It is attached at regular intervals. In FIG. 3, the rake 8 has a structure in which a rectangular plate-like substrate 8A is fixed to an L-shaped steel spanned between the drive chains 7 and 7, and the substrate 8A has a groove through which a part of the screen bar 3A passes. A plurality of scraping plates 8B that are formed and are inserted between the screen bars 3A and project upstream from the front edge of the screen bar 3A are fixed.

  A guide roller 9 is attached to the link shaft of the drive chain 7, and the guide roller 9 is guided by the guide rails 12 of the upper frame 10 and the lower frame 11, thereby positioning the first path of the drive chain 7. The As shown in FIGS. 1 and 2, a drive motor 13 and a speed reducer 14 that drive the drive sprocket 5 are placed on the upper frame 10.

  As described above, when the drive motor 13 is driven and the drive chain 7 rotates clockwise in FIG. 1, the screen residue captured by the screen 3 (FIG. 2) is retained by the rake 8 (scraping plate 8B). It is scraped toward the crusher 2 side, flows into the residue crusher 2 from the end of the screen 3 and is crushed. Examples of the screen crusher 2 include those described in JP-A-2004-49944.

  In the process from the first path S1 to the second path S2 on the drive sprocket 5 by the rake mounting portion 7A of the drive chain 7, the rake 8 is retracted from the screen 3 and is separated. Scraped and part of the residue remains. If this gradually becomes accumulated and compressed and solidified, it becomes easy to give a large sliding resistance to the rake 8. That is, when the rake attachment portion 7A to which the rake 8 is attached reaches the drive sprocket 5, a large external force is applied from the rake 8 to the engagement portion, which may impair the smooth engagement.

  In order to solve this problem, the present invention includes a rake retracting means 17 for retracting the rake 8 from the front edge 3B of the screen 3 when the rake mounting portion 7A of the drive chain 7 is positioned in the first path S1. That is, the rake 8 is hidden from the front edge 3B of the screen 3, and the blade of the rake 8 does not protrude. As an example of the rake retracting means 17, as shown in FIG. 4, a protruding portion 18 is formed on the front edge 3 </ b> B <b> 1 of the straight portion of the screen 3, and the rake 8 is hidden by the protruding portion 18. The projecting portion 18 has a tapered portion 19 in which the projecting amount from the front edge 3B1 increases as it goes toward the downstream end of the screen 3, that is, as it moves in the moving direction of the rake 8. Thereby, as shown in FIG. 6, when the rake 8 passes through the tapered portion 19, the periphery of the tip is gradually hidden by the tapered portion 19 and finally completely hidden from the front edge 3 </ b> B <b> 2 of the protruding portion 18. It becomes an aspect.

  It is desirable that the protruding portion 18 be provided near the downstream end of the straight portion of the screen 3. The positional relationship of the protrusions 18 in the length direction of each screen bar 3A may be the same position as shown in FIG. 5 (a), or may be shifted from each other as shown in FIG. 5 (b). Good. Moreover, you may provide at random. Further, when the straight line portion is long, it may be provided at a plurality of positions with intervals. In FIG. 4, after the rake 8 has passed through the protruding portion 18, the rake 8 protrudes again from the front edge 3 </ b> B <b> 1 of the straight portion of the screen 3, and then the rake attachment portion 7 </ b> A moves from the first path S <b> 1 to the second path S <b> 2. In the figure, the rake 8 is detached from the screen 3. Since the distance during which the rake 8 protrudes from the front edge 3B1 of the linear portion of the screen 3 after passing through the protruding portion 18 is short, the amount of residue that is scraped during this time is small. Therefore, clogging does not occur so much at the detachment portion of the rake 8 on the screen 3.

  According to the present invention, when the rake attachment portion 7A of the drive chain 7 is located in the first path S1, that is, when the rake attachment portion 7A to which the rake 8 is attached has not yet reached the drive sprocket 5, the rake 8 Is retracted from the front edge 3B of the screen 3, even if the residue is scraped away and sliding resistance is generated in the rake 8 at this retracted position, the rake mounting portion 7A is still in the drive sprocket 5. Therefore, the external force acting on the meshing portion between the drive sprocket 5 and the drive chain 7 is small. Therefore, according to the present invention, the smooth engagement between the drive sprocket 5 and the drive chain 7 is maintained.

  Further, if the protrusion 18 is formed on the front edge 3B1 of the straight portion of the screen 3 and the protrusion 18 hides the rake 8, the rake retracting means 17 having a simple structure is obtained, and the side scraping dust remover 1 is Production costs can be reduced.

  Further, as the projecting portion 18, a taper portion 19 in which the projecting amount from the front edge 3 </ b> B <b> 1 of the linear portion of the screen 3 becomes larger as it goes in the moving direction of the rake 8 is gradually increased. If the concealing configuration is adopted, the scraping residue of the residue is dispersed along the taper portion 19, so that the screen 3 is not easily clogged.

"First modification"
As described above, the example shown in FIG. 4 is configured so that the rake 8 protrudes again from the front edge 3B1 of the linear portion of the screen 3 after passing through the protruding portion 18, but FIG. In the first modification shown, the protrusion 18 extends long to the vicinity of the downstream end of the screen 3, so that after the rake 8 is hidden by the protrusion 18, it is detached from the screen 3 without protruding again. It is a configuration. According to this, at the timing when the rake mounting portion 7A moves from the first path S1 to the second path S2, there is no interference between the residue of scraping on the screen 3 and the rake 8, so that the drive sprocket 5 and Smooth engagement with the drive chain 7 is maintained over a long period of time.

"Second modification"
The second modified example shown in FIG. 8 is configured such that a part of the first path S1 of the drive chain 7 is moved away from the screen 3 as the rake retracting means 17. As a specific structural example, a part of the guide rail 12 shown in FIG. 3 is curved downstream so that the linear track of the drive chain 7 is partially curved downstream. According to this configuration, the rake 8 is retracted from the front edge 3B of the screen 3 when the rake attachment portion 7A is positioned on the curved track, and the same effect as that of the protruding portion 18 shown in FIG. Since the rake 8 is retracted from the front edge 3B of the screen 3 when the rake mounting portion 7A has not yet reached the drive sprocket 5, even if the rake 8 is left behind at the retracted portion, the rake 8 has a sliding resistance. Even if this occurs, there is an effect that the influence of external force acting on the meshing portion between the drive sprocket 5 and the drive chain 7 is reduced. Further, according to the second modification, the existing screen 3 having no protrusion can be used as it is, and the rake retracting means 17 becomes economical.

  The preferred embodiment of the present invention has been described above. The shape of the screen 3 is not limited to the linear shape shown in FIG. 4 or the like, and the screen 3 may be curved as long as the first path S1 of the drive chain 7 is laid out along the screen 3.

DESCRIPTION OF SYMBOLS 1 Side scraping type dust remover 3 Screen 3A Screen bar 3B Front edge 5 Drive sprocket 6 Driven sprocket 7 Drive chain 7A Rake attachment part 8 Rake 17 Rake retraction means 18 Protrusion part 19 Tapered part S1 1st path | route S2 2nd path | route

Claims (4)

A screen formed by arranging screen bars side by side; and a rake attached to the chain and inserted between the screen bars to scrape the residue, the rake attachment portion of the chain from a first path along the screen In the horizontal scraping type dust remover for installing a waterway having a configuration in which the rake is detached from the screen in the process of reaching the second path on the sprocket,
A lateral scraping type dust remover comprising rake evacuation means for evacuating the rake from the front edge of the screen when the rake attachment portion of the chain is located in the first path.   The horizontal scraping type dust remover according to claim 1, wherein the rake retracting means is configured such that a protrusion is formed on a front edge of a screen, and the protrusion hides the rake.   The projecting portion has a tapered portion in which a projecting amount from a front edge of the screen increases as the rake moves in the moving direction, and the tapered portion gradually hides the rake. Item 3. A side-scraping dust remover according to Item 2.   The side scraping type dust remover according to claim 1, wherein a part of the first path of the chain is kept away from the screen as the rake retracting means.

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