JP4497670B2 - Sludge scraping member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a scraping member used in a sedimentation basin scraping machine that moves a scraping member on a bottom surface of a sedimentation basin and scrapes sludge.
[0002]
[Prior art]
FIG. 2 is a schematic configuration diagram showing, in section, a settling basin provided in a water treatment facility such as a sewage treatment plant. This sedimentation basin a receives raw water from one end side (left side in FIG. 2) through the raw water inflow pipe 1a, and discharges treated water (supernatant water) through the treated water outflow pipe 1b provided on the other end side. It is in the shape of a well-known cross-flow sedimentation basin configured to be able to.
[0003]
The bottom surface 2 of the settling basin a is formed in a substantially horizontal plane, and a sludge pit 3 is provided on the raw water receiving side of the bottom surface 2.
[0004]
Raking device 4 is mounted to reciprocally move on the bottom surface 2 of the sedimentation tank a, a plurality of raking members 5a, 5a ... have a predetermined interval in the direction of flow of the raw water, and, perpendicular to the direction of flow of raw water It is provided in parallel with the direction to be performed. And each scraping member 5a, 5a ... has a length substantially equal to the width of the settling basin a ( distance in a direction orthogonal to the direction in which the raw water flows), similarly to the known reciprocating scratching member. , beside the cross-sectional shape, as shown, a substantially vertical surface shape of the rake face that slightly recessed sludge pit 3 side, and a bottom surface extending horizontally in the direction opposite to the sludge pit from the lower end of the rake face, rake face upper end and a sludge pit 3 of the bottom surface of a side opposite to the end portion or in flank the downward inclination of, and has a substantially triangular shape. And the upper part of these scraping members 5a, 5a ... is integrated via the connecting rod 6a and the assembly material 6b mentioned later, and the scraping machine 4 is comprised.
[0005]
The link mechanism 7 converts the rotational movement by the motor M into the horizontal reciprocating movement of the scraper 4, and the upper end portion of the connecting rod 7a of the link mechanism 7 has the rotation speed of the motor M at a predetermined rate. It is pivotally attached to one point on the rotation path of a known speed reducer 8 such as a speed reducing gear, and the lower end portion of the connecting rod 7a is the second of a triangular conversion portion 7b provided on the side wall of the settling basin a. It is pivotally connected to one vertex . Further, the second apex portion of the conversion portion 7b is rotatably supported on the side wall of the sedimentation tank a, the third vertex portion of the turning portion 7b is round one end to the connecting rod 6a of raking machine 4 A connecting rod 7c that is movably connected is coupled to be freely rotatable. Therefore, when the speed reducer 8 is rotated by the motor M and the connecting rod 7a moves up and down, the scraper 4 reciprocates on the bottom surface 2 of the settling basin a as shown by the arrows 1 and 2 in FIG. can do. The reciprocation interval is determined to be slightly larger than the interval between the scraping members 5a and 5a.
[0006]
The sludge pit 3 is provided with a sludge pipe P having a valve V. When the valve V is opened, the sludge in the sludge pit 3 can be discharged to a sludge treatment device (not shown).
[0007]
Raking device 4 configured as described above, in the forward moving the sludge pit 3 side (see arrow circle 1 in Figure 2), moves the sludge forward by the rake face of the raking member 5a (sludge pit 3 side) is, in the backward (arrow circle 2 in FIG. 2) that raking device 4 moves away from the sludge pit 3 side, the flank of the raking member 5a is to reduce the resistance received from the sludge moves the sludge Not . Therefore, the sludge on the bottom surface 2 of the settling basin a is scraped to the sludge pit 3 by the reciprocating motion of the scraper 4.
[0008]
[Problems to be solved by the invention]
However, since the conventional sedimentation tank scraper cannot scrape the sludge on the bottom surface of the sedimentation basin, there is a drawback that the sludge on the bottom surface of the sedimentation tank rots.
[0009]
This will be further described with reference to FIG. 3. FIG. 3 (a) is an enlarged perspective view of a part of the scraper 4 shown in FIG. 2, and FIG. 3 (b) is a BB line in FIG. It is an expanded sectional view.
[0010]
As shown in FIG. 2, the plurality of scraping members 5 a, 5 a... Of the scraping machine 4 are not only the connecting rod 6 a connected to the link mechanism 7, but as shown in FIG. The bottom surfaces of the members 5a, 5a,... Are assembled by a plurality of assembly materials 6b, 6b,. .. Are fixed to the bottom surfaces of the scraping members 5a, 5a... By welding or the like at a predetermined interval in a direction orthogonal to the longitudinal direction of the scraping members 5a, 5a. That is, the scraping machine 4 is configured by combining a plurality of scraping members 5a, 5a... And a plurality of assembly materials 6b, 6b.
[0011]
In FIG. 3, 9, 9... Are synthetic resin receivers provided at positions corresponding to the respective assembly materials 6 b, 6 b, etc. on the bottom surface 2, and smoothly reciprocate the scraper 4. It is provided so that it can be done.
[0012]
As described above, a gap d of about 10 mm is formed between the scraping member 5a and the bottom surface 2 by the assembly material 6b and the receiving material 9 existing at the lower part of the scraping machine 4, and therefore , The sludge stayed without being scraped by the scraping member 5a , causing rot.
[0013]
Then, this invention was made | formed in order to solve the said fault, Comprising: The objective is to prevent sludge from staying between a scraping member and a sedimentation basin bottom face.
[0014]
[Means for Solving the Problems]
This onset Ming, in order to achieve the above object, are spaced apart towards the slightly from the bottom of the settling tank, the sedimentation pond sludge of the sedimentation tank are deposited on the bottom surface of the reciprocating In the scraping member scraping to the sludge pit side provided on the bottom surface, the scraping member is a substantially vertical scoop surface slightly recessed to the sludge pit side, and a direction opposite to the sludge pit from the lower end portion of the scoop surface A bottom surface that extends horizontally, and a flank surface that slopes downward from the upper end of the rake face to the end opposite to the sludge pit on the bottom face, and has a substantially triangular shape with a cross-sectional shape having a hollow inside An opening that communicates with the cavity , leaving inner bent flanges at both ends of the bottom surface , and the flank is formed in a curved surface that is convex on the upper side. It is characterized in that there.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same components as those in FIGS. 2 and 3 are described using the same reference numerals.
[0016]
1 (a) is an enlarged perspective view of a portion of a raking machine 14 corresponding to FIG. 3 (a), 1 (b) is an A-A line enlarged sectional view of FIG. 1 (a).
[0017]
Like the one shown in FIG. 2, the scraper 14 is connected to a connecting rod (see 6a in FIG. 2) connected to a link mechanism (see 7 in FIG. 2). preferred members 15a, 15a ... is, as shown in FIG. 1 (a), raking members 15a, 15a ... plurality of assembly members 6b disposed on the bottom side of, are assembled in 6b .... .. Are fixed to the bottom surfaces of the scraping members 15a, 15a,... By welding or the like at a predetermined interval in a direction orthogonal to the longitudinal direction of the scraping members 15a, 15a,. That is, the scraping machine 14 is configured by combining a plurality of scraping members 15a, 15a... And a plurality of assembly materials 6b, 6b.
[0018]
In Figure 1, 9, 9 ... is set Tatsuzai 6b on the bottom surface 2, an image receiving material made of a synthetic resin provided on the respective positions corresponding to 6b ..., smooth reciprocation of raking machine 14 It is provided so that it can be done.
[0019]
The external shape of the scraping member 15a is the same as the scraping member 5a shown in FIG. That is, the scraping member 15a has a length substantially equal to the width of the sedimentation basin (see a in FIG. 2 above) ( distance in a direction orthogonal to the flow direction of the raw water), and its cross-sectional shape (the flow direction of the raw water) As shown in an enlarged view in FIG. 1 (b) , the parallel vertical cross-sectional shape is a substantially vertical rake face 151 slightly recessed on the sludge pit (see 3 in FIG. 2) side and the lower end of the rake face. And a bottom surface 152 extending horizontally in the opposite direction to the sludge pit, and a relief surface 153 that is curved upward and curved downward from the upper end of the rake face 151 to the end opposite to the sludge pit on the bottom surface 152. It is almost triangular. Then, the raking members 15a are hollow portion 15a1 is formed in the inner portion, the bottom surface 152, leaving the flange 152b1,152b2 bending the inner end portions, an opening 15a2 is provided communicating with the hollow portion 15a1 Yes.
[0020]
When the scraper 14 having the above-described configuration is reciprocated in the sedimentation basin (see arrows A and B in FIG. 1A), the forward movement of the scraper 14 (see arrows A in FIG. 1A and FIG. 1B ) . ) when the sludge is moved forward by the rake face 151 of the raking member 15a. Since the flank 153 of the scraping member 15a is formed in a curved surface that is convex upward, the occurrence of vortex (or turbulence) behind the upper end of the rake face 151 is suppressed. Further, since the relief surface 153 of the raking member 15a is formed in a curved surface shape that is convex upward, backward away from the sludge pit side of the raking machine 14 (FIG. 1 (a) (b) arrow b during reference), flank 153 of the raking member 15a because receives from the sludge resistance is reduced, without moving the sludge (scattering), raking machine 14 is backward. Therefore, the sludge on the bottom surface 2 of the sedimentation basin is efficiently scraped to the sludge pit by the reciprocating motion of the scraper 14.
[0021]
Further, when the raking member 15a reciprocates is in the cavity 15a1 of the raking member 15a, as shown in FIG. 1 (b), actively is and out of water containing sludge from the opening 15a2 A swirling flow is generated and according to the moving direction of the scraper 14. Thereby , the sludge which exists in the clearance gap d of the lower surface of the scraping member 15a and the bottom face 2 of a sedimentation basin is disturbed. Therefore, it is possible to prevent sludge from staying in the gap d for a long time and causing the sludge to rot.
[0022]
Further, since the scraping members 15a, 15a,... Are formed hollow, the entire mass of the scraping machine 14 can be reduced, and an effect of reducing the power cost can be obtained.
[0023]
【The invention's effect】
As described above, according to the present invention, the scraping member has a substantially vertical rake face that is slightly recessed on the sludge pit side, and a bottom face that extends horizontally from the lower end portion of the rake face in the opposite direction to the sludge pit. And a flank that slopes down from the upper end of the rake face to the end opposite to the sludge pit on the bottom face, and the cross-sectional shape is formed in a substantially triangular shape having a hollow portion therein The flank is formed in a curved surface with a convex surface on the upper side, so that the generation of vortex (or turbulence) behind the scraping member is suppressed, and the sludge on the bottom of the sedimentation basin is efficiently sludge. Scratched into the pit. In addition, an opening that communicates with the hollow portion leaving an inner bent flange is provided at both ends of the bottom surface of the scraping member , and the flank is formed in a curved surface that is convex upward. In the reciprocating motion of the scraping member, a swirl flow is likely to be generated in the cavity, so that the sludge between the scraping member and the bottom surface of the sedimentation basin actively enters and exits the cavity from the opening. Therefore , it can prevent beforehand that it stays for a long time and decays.
[Brief description of the drawings]
FIG. 1A is a perspective view of a part of a settling basin scraper according to the present invention, and FIG. 1B is an enlarged sectional view taken along line AA in FIG.
FIG. 2 is a cross-sectional view of a sedimentation basin using a conventional reciprocating scraper.
FIG. 3A is a perspective view of a part of a conventional sedimentation basin scraper, and FIG. 3B is an enlarged cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
1a Raw water inflow pipe 1b Treated water outflow pipe 2 Bottom surface of sedimentation basin 3 Sludge pit 4 Scraper 6b Assembly material 9 Receiving material 15a Scratching member
151 Rake face
152 Bottom
153 Flank 15a1 Hollow 15a2 Opening
152b1, 152b2 Inner bending flange 6a Connecting rod 7 Link mechanism a Sedimentation basin P Drainage pipe V Valve

Claims (1)

From the bottom of the settling tank are spaced apart towards the slightly, raking causes the sludge is reciprocated is deposited on the bottom of the settling pond sludge pit side which is provided on the bottom of the settling basin raking In the member,
The scraping member has a substantially vertical rake face that is slightly recessed on the sludge pit side, a bottom face that extends horizontally from the lower end of the rake face in a direction opposite to the sludge pit, and the bottom face from the upper end of the rake face. A sloping pit and a flank face that slopes down to the opposite end, and the cross-sectional shape is formed in a substantially triangular shape having a hollow portion therein, and the bottom is bent inward at both ends thereof An scraping member, characterized in that an opening that communicates with the cavity is provided , leaving a flange , and the flank is formed in a curved surface that is convex upward .

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