JP2016000387A - Return path side guide shoe, and chain flight type sludge scraper having the return path side guide shoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a return path side guide shoe capable of preventing a chain and a flight from falling due to sloshing phenomenon by the return path side guide shoe of a simple structure and capable of being applied to an existing facility in a post-installation manner, and a chain flight type sludge scraper having the return path side guide shoe.SOLUTION: A return path side guide shoe 12 for guiding along a return path side guide rail 9, a flight 4 arranged in a chain flight type sludge scraper is equipped, on both end portions of a slide face for the return path side guide rail 9, with protrusions 12a having a height dimension H higher than a height dimension L of a head part of the return path side guide rail 9.

Description

  The present invention relates to an improvement of a chain flight type sludge scraping machine used in a sewage and wastewater treatment sedimentation basin, and more particularly to a return flight side guide shoe and a chain flight type sludge scraping machine equipped with the return side guide shoe. It is.

2. Description of the Related Art Conventionally, chain flight type sludge scrapers installed in a sedimentation basin include those shown in FIGS. 2 to 4 (see, for example, Patent Document 1).
In this chain flight type sludge scraper, the scum that floats on the water surface on the flight traveling on the return path side is raked up to the scum skimmer, the scum is swollen together with the surface water, and discharged outside the pond.

JP-A-8-267059

By the way, in the conventional chain flight type sludge scraper, there are many cases where the chain 2 and the flight 4 fall off due to the sloshing phenomenon in which the accumulated water in the settling pond fluctuates due to the earthquake, leading to a serious accident. It was sought after.
That is, as a measure against sloshing, it is necessary to suppress the swinging of the chain 2 and the flight 4 near the water surface between the drive shaft and the intermediate shaft and to prevent the return-side guide rail 9 from falling off. The sludge scraper could not suppress the rocking due to its structure.

  Although a method of providing a guide rail for preventing the flight 4 from rising above the return-side guide rail 9 has been proposed, in addition to the problem that the cost of countermeasures is high, the flight 4 is lifted later on the existing equipment. Providing a guide rail for prevention is often difficult due to structural limitations.

  In view of the problems of the conventional chain flight type sludge scraping machine, the present invention can prevent the chain and the flight from dropping off by a sloshing phenomenon by using a return-side guide shoe having a simple structure. It is an object of the present invention to provide a return flight guide shoe that can be retrofitted to the above equipment and a chain flight type sludge scraper equipped with the return flight guide shoe.

  In order to achieve the above object, the return side guide shoe of the present invention is a return side guide shoe for guiding a flight arranged in a chain flight type sludge scraper along a return side guide rail. Protrusions having a height dimension equal to or higher than the height dimension of the head of the return path guide rail are provided at both ends in the width direction of the sliding surface with respect to the return path guide rail.

  In this case, the shape of the inner side surface of the protrusion can be formed in a shape along the shape of the outer side surface of the head of the return path guide rail.

  Moreover, the chain flight type sludge scraper of the present invention is characterized in that the return-side guide shoe is attached at a position corresponding to the return-side guide rail of the flight.

The return flight side guide shoe of the present invention and the chain flight type sludge scraper equipped with the return pass side guide shoe are provided at both ends of the sliding surface of the return pass guide shoe with respect to the return pass guide rail in the width direction. By providing a protrusion with a height dimension greater than the height dimension of the head, even if the flight lifts due to the sloshing phenomenon and the return-side guide shoe is detached from the return-side guide rail, the return-path side The projection provided on the guide shoe is maintained in a position where the head of the return-side guide rail is sandwiched between them, and the return-side guide shoe is positioned at the fixed position of the return-side guide rail without causing a positional shift by the projection. It is possible to prevent the chain and the flight from dropping off by the return side guide shoe having a simple structure.
In addition, the return-side guide shoe has no structural restrictions when it is attached to a position corresponding to the return-path guide rail of the flight, and can be applied to existing equipment as a retrofit. The scraper can be easily modified to an earthquake-resistant chain flight sludge scraper.

  Further, by forming the shape of the inner surface of the protrusion along the shape of the outer surface of the head of the return-side guide rail, the inner surface of the protrusion becomes the outer surface of the head of the return-side guide rail. It is possible to prevent partial exhaustion by hitting a piece.

It is explanatory drawing which shows one Example of the chain flight type sludge scraping machine of this invention. It is explanatory drawing of the conventional chain flight type sludge scraping machine. It is a top view of the chain flight type sludge scraping machine. It is a side view of the chain flight type sludge scraper.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a return flight side guide shoe and a chain flight type sludge scraper equipped with the return pass side guide shoe of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the return side guide shoe and the chain flight type sludge scraper of the present invention.
This chain flight type sludge scraping machine is installed in the sedimentation basin 1 like the chain flight type sludge scraping machine shown in FIGS. The two chains 2 are stretched endlessly between the sprocket wheels 31, 32, 33, 34 provided on the drive shaft and the support shaft (intermediate shaft) installed in the sedimentation basin 1, and many at regular intervals. The flight 4 is attached.

And this one sprocket wheel 31 is driven with the drive device 5, and a chain flight type sludge scraper is driven at a predetermined speed.
In addition, an outward guide rail 6 is disposed in the longitudinal direction of the bottom of the sedimentation basin 1, and an outward guide shoe 11 is attached at a position corresponding to the outward guide rail 6 of the flight 4. 11 is slid on the outward guide rail 6 and the flight 4 moves on the outward route so that the sludge settled on the pond bottom is scraped into the hopper 10 provided on the pond bottom end side.

  In the sedimentation pond 1, a scum skimmer 7 and an overflow trough 8 are provided on the surface of the terminal position of the flight 4 moving on the return path side, and the scum scraped by the flight 4 moving on the return path side It is discharged to the scum pit S, and the supernatant treated water is discharged from the overflow trough 8 to the outside of the pond.

  Then, the return side guide rail 9 that supports the flight 4 so that the flight 4 moving on the return side moves on a predetermined trajectory from the hopper 10 side, that is, the upstream side of the sedimentation basin 1 at the water surface position. At least along the moving length of the flight 4 on the return path via a mounting bracket 9B installed on the wall surface of the sedimentation basin 1 and at the position corresponding to the return path guide rail 9 of the flight 4 The shoe 12 is attached.

Furthermore, the scum skimmer 7 provided in front of the overflow trough 8 on the outflow side of the sedimentation basin employs a pipe skimmer linked to the operation of the chain flight type sludge scraper in this embodiment, but is not limited thereto.
Further, a scum pit S and a scum transfer pump P are provided on the side of the sedimentation basin 1.

This chain flight type sludge scraper rotates a drive shaft and a drive sprocket wheel from a drive device 5 via a transmission chain C, and a chain 2 and a flight 4 attached to the chain 2 are set in a sedimentation basin 1. Let it go around.
The flight 4 attached to the chain 2 is guided along the forward guide rail 6 on the forward path side, and the sludge that has settled on the bottom of the pond is raked up to the hopper 10 on the inflow side and is reversed and returned to the water surface. Then, the scum that is guided along the return-side guide rail 9 and floats on the water surface is raked up to the scum clearance 7.

  The scraped scum is swollen together with the surface water by the scum skimmer 7 that periodically operates, flows into the scum pit S, and is pumped and processed by a separate scum transfer pump P.

  By the way, in this chain flight type sludge scraping machine, in order to prevent the outward guide shoe 11 and the return guide shoe 12 from separating from the outward guide rail 6 and the return guide rail 9, the outward guide shoe 11 and the return path side guide shoe 12 are provided with protrusions 11a and 12a, respectively.

  Among these, the protrusion 11 a provided on the outward path guide shoe 11 has a height of the head of the outward path guide rail 6 at the outer end in the width direction of the sliding surface of the outward path guide shoe 11 with respect to the outward path guide rail 6. A relatively low height dimension h less than the dimension is set.

  On the other hand, the protrusion 12a provided on the return side guide shoe 12 is a sliding surface of the return side guide shoe 12 with respect to the return side guide rail 9 in order to prevent the chain 2 and the flight 4 from falling off due to the sloshing phenomenon (here, The dimension of the sliding surface in the width direction should be set to about 2 to 3 times the width of the head of the return path guide rail 9 (for example, about 38 mm when the return path guide rail 9 is a 12 kg rail). The height dimension H of the head of the return-side guide rail 9 is greater than the height dimension L (for example, about 20 mm when the return-side guide rail 9 is a 12 kg rail) at both ends in the width direction. Specifically, it is set to 20 to 40 mm, preferably about 25 to 35 mm.

The protrusion 12a is preferably formed such that the shape of the inner surface of the protrusion 12a conforms to the shape of the outer surface of the head of the return path guide rail 9.
Thereby, it is possible to prevent the inner surface of the protrusion 12a from being partially consumed due to the one-side contact with the outer surface of the head of the return path guide rail 9.

The protrusion 12a provided on the return-side guide shoe 12 is provided with the protrusion 12a even when the flight 4 is lifted by the sloshing phenomenon and the return-side guide shoe 12 is detached from the return-side guide rail 9. 9 is maintained in a state where the head of 9 is opposed to the middle, and the return-side guide shoe 12 returns to the home position of the return-side guide rail 9 without causing a positional shift by the protrusion 12a, and the chain 2 and the flight 4 can be prevented from falling off by the return-side guide shoe 12 having a simple structure.
In addition, the return-side guide shoe 12 is not structurally limited when it is attached to the position corresponding to the return-side guide rail 9 of the flight 4, and therefore can be applied to existing equipment as a retrofit. The flight-type sludge scraper can be easily modified to an earthquake-resistant chain-flight sludge scraper.

  The forward path side guide shoe 11 and the backward path side guide shoe 12 can be made of any material having corrosion resistance and wear resistance, such as cast iron, cast steel, stainless steel, and synthetic resin.

  In addition, it is preferable that the return path side guide shoe 12 provided with the protrusions 12a is attached to the flight 4 on all of them and on both the left and right sides of the flight 4, but a part or one side of the flight 4 You may make it attach the return path side guide shoe 12 which does not provide the protrusion 12a.

  As mentioned above, although the chain flight type sludge scraping machine of the present invention has been described based on the embodiments thereof, the present invention is not limited to the configurations described in the above embodiments, and is appropriately within a range not departing from the spirit thereof. The configuration can be changed.

  The return flight side guide shoe of the present invention and the chain flight type sludge scraper equipped with the return pass side guide shoe can prevent the chain and the flight from dropping off due to the sloshing phenomenon by the return path guide shoe having a simple structure. Therefore, it can be used suitably for earthquake-fighting chain flight sludge scraping machines, and can be applied to existing facilities as a retrofitting chain flight sludge scraping machine. Can be modified.

DESCRIPTION OF SYMBOLS 1 Settling basin 2 Chain 31, 32, 33, 34 Sprocket wheel 4 Flight 5 Drive device 6 Outward guide rail 7 Scum skimmer 8 Overflow trough 9 Return side guide rail 10 Hopper 11 Outward side guide shoe 11a Protrusion 12 Return side guide shoe 12a Protrusion

Claims (3)

  In the return-side guide shoe that guides the flight arranged in the chain flight type sludge scraper along the return-side guide rail, at both ends in the width direction of the sliding surface of the return-side guide shoe with respect to the return-side guide rail, A return-side guide shoe characterized in that a protrusion having a height dimension equal to or greater than the height of the head of the return-path side guide rail is provided.   The return side guide shoe according to claim 1, wherein the shape of the inner side surface of the protrusion is formed in a shape along the shape of the outer side surface of the head of the return side guide rail.   A chain flight type sludge scraping machine, wherein the return-path guide shoe according to claim 1 or 2 is attached to a position corresponding to a return-path guide rail of a flight.

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