JPH07268845A - Rake of trashrack rake - Google Patents

Abstract

PURPOSE:To scrape out sediment jammed in screen meshes without pushing it into the meshes and securely rake up and discharge it without dropping out from the rakes. CONSTITUTION:In a trashrack rake moving down at the rear side and raking up at the front side, the part 32a engaging into screen meshes, of the front end of a rake is bent forward so that the component of the force by which the sediment collected on the screen and the sediment jammed in the screen meshes are scrapped out of the screen 2 by the driven rakes 32 of the raking device driven along the screen surface, is given. In this way, sediment jammed in the screen meshes is picked up and perfectly scrapped out. Since the other end of the rakes is bent forward, sediment scrapped up by the rake faces does not drop out and hence, it is securely scraped up and discharged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rake for a dust remover capable of scraping out dust caught in a screen eye without pushing it into the screen eye and reliably scraping and discharging it without spilling from the rake. It is one.

[0002]

2. Description of the Related Art In a sewage treatment plant, in order to remove solids contained in wastewater in advance, a dust remover is installed so as to block the water flow in a water channel. This dust remover is composed of a screen fixed in the water channel and a rake that moves up and down along the screen to scoop up and discharge the screen residue captured by the screen. The rake having a comb-like tip is projected on the endless chain so that the rake meshes with the eyes of the bar screen to move.

[0003]

Since the rake which is meshed with and moves in the eyes of the screen has a flat plate shape and is arranged at a right angle to the screen surface or at a predetermined angle as shown in FIG. When scooping up the screen residue captured by the rake with the rake, the screen residue that has been caught in the screen width is pushed down into the screen eye by the operation of the rake and is made to flow downstream as shown in FIG. There are drawbacks. In addition, the residue scraped off from the screen surface by the rake during the rake was sometimes spilled.

It is an object of the present invention to surely scrape off the residue that has been caught in the screen mesh by changing the cross-sectional shape of the rake, and prevents the residue from spilling during the operation of the rake.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and in a back descent front scraping type dust remover, removes a screen residue captured by a screen and a screen residue caught in a screen eye. The gist is that the part of the rake tip that engages the screen eye is bent forward so as to give a component force to be scratched from the screen when the rake runs along the screen surface.

[0006]

[Operation] The residue captured on the screen surface and the residue caught in the screen mesh is caught in the screen mesh and bends in the forward tilt direction at the rake tip that runs along the screen surface. By the rake operation, component force is applied in the direction of scraping from the screen surface, so that the scraping can be surely performed without being pushed into the eyes of the screen. Further, since the other end of the rake is also bent forward, it is possible to prevent the residue on the rake from falling.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The rake of the dust remover of the present invention will be described below with reference to the embodiments shown in the drawings. In FIG. 2, reference numeral 1 denotes a water channel of a sewage treatment plant. A screen 2 having a required mesh width is installed so as to block the water channel 1, and when the sewage flows down the eyes of this screen, the residue contained in the sewage. And a rake device 3 for scraping up and discharging the screen residue captured by the screen is arranged along the screen.

The rake device 3 has rakes 32, 32, ... Protrudingly provided at predetermined intervals on an endless chain 31 disposed upstream and downstream of the screen 2 and the endless chain 31. Is guided by a curved U-shaped guide rail 33 at the lower bottom of the screen, each rake 32 descends downstream of the screen 2, at a position farther from the back of the screen, and upstream the comb teeth of the rake on the upstream side. The part is raised so as to come into contact with the screen surface so that the part meshes with the inside of the screen.

The endless chain 31 is engaged with a drive sprocket wheel provided on the body frame F of the dust remover above the water surface, and is guided to a U-shaped guide rail 33 along the screen from the central portion to the lower portion. It is designed to drive.

As shown in detail in FIG. 1, the rake 32 is arranged so as to be substantially orthogonal to the endless chain 31,
In addition, the rake tip portion 32a is fixed so as to be substantially orthogonal to the screen surface, and the tip of the rake tip portion 32a, which is inserted into the comb-shaped screen mesh, is moved forward by a predetermined angle θ with respect to the rake traveling direction. The rake is tilted in the direction so that the scraps sandwiched in the screen mesh are scraped up by the rake tip 32a.

The other end 32b of the rake 32, which projects upward from the chain on the other end side, is similarly bent so as to incline forward with respect to the rake traveling direction, whereby the rake 32 extends along the screen surface. It moves upwards so that the screen residue captured on the screen surface does not spill even when the rake runs.

Therefore, when the rake 32 fixed to the endless chain 31 is moved in a direction in which it meshes with the screen mesh and moves upward, the rake tip portion 32a is bent so as to incline forward by a predetermined angle θ. The shavings caught in the screen eyes are also operated by the rake and the horizontal component of force with the inclined surface of the rake tip acts in the direction of the arrow shown so that the residues are picked up from the screen eyes and trapped on the screen surface. The screened residue and the screen residue caught in the screen eyes are surely scraped up, and are not pushed into the screen eyes and flow out to the downstream side of the water channel.

Further, since the rake other portion 32b is also bent in the forward tilt direction, the shavings trapped on the screen surface by the rake operation are pushed out in the upward direction of the screen and are not spilled, so that the rake is sure to occur. It will be fried in the air.

[0014]

EFFECT OF THE INVENTION The rake of the dust remover of the present invention is a rear descent front rake type dust remover for operating a rake that is operated along the screen surface of the screen residue captured by the screen and the screen residue caught in the screen. Since the part of the rake tip that bites into the screen eye is bent forward to give the component force to be pushed out from the screen, scraps that are bite into the screen are also lifted up and reliably scraped. Further, since the other end of the rake is also bent in the forward tilt direction, there is an advantage that the rake can be scraped up on the rake surface and the residue can be reliably scraped up and discharged without spilling.

[Brief description of drawings]

FIG. 1 is an enlarged front view showing an embodiment of a rake of a dust remover of the present invention.

FIG. 2 is a front view showing the entire shape of the rake of the dust remover of the present invention.

FIG. 3 is a plan view of a rake meshed with a screen.

FIG. 4 is a front view of a known example.

FIG. 5 is an explanatory diagram of a known example.

[Explanation of symbols]

 1 Water Channel 2 Screen 3 Rake Device 31 Endless Chain 32 Rake 32a Rake Tip 32b Rake Other End

Claims (2)

[Claims] 1. A rear descent front scraping type dust remover is provided with a component force for scraping off the screen dust and the screen dust caught on the screen by the rake running along the screen surface. A rake for a dust remover, characterized in that the part of the rake tip that engages with the screen eye is bent forward. 2. The rake for a dust remover according to claim 1, wherein the rake whose front end is bent forward is inclined and bent at the other end so as to prevent the residue from spilling and spilling.