Sludge scraper

Abstract

To provide a chain flight type sludge scraper in which the number of components is reduced with a simple structure in which a guide rail for supporting a chain is configured integrally with a support part of a flight, and anti-sloshing is realized.SOLUTION: A sludge scraper comprises: a flight which scrapes sludge or scum; a chain which supports the flight; a chain support member which supports the chain; a flight shoe provided at a lower end of the flight; and a water surface guide rail which supports the chain support member and the flight shoe from a bottom surface.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a sludge scraper that scrapes up sludge that has accumulated on the bottom of a sedimentation tank. [Background technology]

[0002] The chain flight type sludge collector is a device that has traditionally been used in rectangular settling tanks, and is installed to scrape the sludge that has settled and separated in the settling tank into a pit. The sludge collector is a device that scrapes the settled sludge into the pit by sliding flights attached at regular intervals to a double endless chain along rails installed on the bottom of the tank.

[0003] Since sludge scrapers are operated with water flowing through the settling tank, a phenomenon known as sloshing, in which the water surface sways, can occur during earthquakes. When sloshing occurs, the flights near the water surface are affected by the water's swaying, causing malfunctions such as the flights falling off or the wheels coming off each axle, and in order to restore operation, it becomes necessary to drain the water and return the flights and chains to their original positions, so in recent years, technologies have been developed to hold the flights in place against sloshing.

[0004] Patent Document 1 describes a sludge scraper comprising: a chain disposed within a sedimentation tank; a movable flight body that is driven by the chain and scrapes up sludge within the sedimentation tank; stoppers provided at both ends of the movable flight body; a pond bottom guide rail that guides the movement of the movable flight body when it travels on the bottom of the sedimentation tank; a water surface guide rail that guides the movement of the movable flight body when it travels on the water surface of the sedimentation tank; and a guard rail that regulates the upward and lateral movement of the movable flight body traveling on the water surface guide rail, the movable flight body has guide shoes that can slide on the water surface guide rail, the guard rail regulates the upward and lateral movement of the movable flight body by the stopper coming into contact with the guard rail, the stopper and the guard rail are located below the water surface of the sedimentation tank, and the width of the stopper is wider than the width of the movable flight body. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-231627 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the conventional technology, the flight is supported by providing shoes at both ends of the flight and supporting the flight with guide rails. Also, stoppers are provided at both ends of the flight to restrict the upward and lateral movement of the flight movable body, preventing the flight from being affected by the sloshing of the water and causing problems such as the flight falling off or coming off each shaft.

[0007] However, in this conventional support method, the chain as well as the flights are supported by shoes at both ends of the flights, which means that the chain and the supports are horizontally separated, and a moment of force acts on the end flights. Therefore, it is necessary to support the flight plate and the chain via a base member that structurally supports them. In addition, the load on the sliding surface of the shoe, particularly on the chain side, increases while the load on the side wall of the sedimentation tank decreases, so that only the wear on the chain side of the sliding surface of the shoe increases.

[0008] Therefore, an object of the present invention is to provide a chain flight type sludge scraper that has a simple structure and provides measures against sloshing. [Means for solving the problem]

[0009] As a result of thorough investigation into the above-mentioned problems, the inventor discovered that it is possible to implement measures against sloshing by providing a member for supporting the chain, a flight shoe, and a water surface guide rail, and thus completed the present invention. That is, the present invention relates to the following sludge scraper.

[0010] The sludge scraper of the present invention, which is intended to solve the above problems, is characterized by comprising a flight for scraping sludge or scum, a chain supporting the flight, a chain support member for supporting the chain, a flight shoe provided at the lower end of the flight, and a water surface guide rail for supporting the chain support member and the flight shoe from the bottom. According to this feature, it is possible to provide a sludge collector with a simple structure having a small number of component parts, consisting of a chain, a chain support member, a flight shoe attached to the chain, and a water surface guide rail that supports the flight shoe.

[0011] In one embodiment of the sludge scraper of the present invention, the flights are configured to restrict movement in the left and right directions. According to this feature, costs can be reduced by reducing the number of components, and highly accurate arrangement can be achieved by the integral structure with the chain support portion, while the simple structure can effectively resist sloshing.

[0012] In one embodiment of the sludge scraper of the present invention, the water surface guide rail has a structure that restricts the upward and left-right movement of the flight. According to this feature, costs can be reduced by reducing the number of components, and highly accurate arrangement can be achieved by integrating the structure with the chain support portion, while the simpler structure can effectively resist sloshing.

[0013] In one embodiment of the sludge scraper of the present invention, the chain support member is fixed to a water surface guide rail. According to this feature, the chain support member and the water surface guide rail can be formed into an integral structure, making it possible to provide a sludge scraper with a simple structure having a small number of component parts. Effect of the Invention

[0014] According to the present invention, it is possible to provide a chain flight type sludge scraper that realizes measures against sloshing with a simple structure that shares a water surface guide rail that supports the flight and a chain support part that is provided on the upper surface of the water surface guide rail and supports the chain. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a schematic diagram showing a longitudinal cross section of a settling tank having a sludge scraper. [Diagram 2] FIG. 2 is a front schematic view of a chain flight type sludge collector. [Diagram 3] 1 is a schematic diagram showing the structure of a chain, a chain support member, a flight shoe, a water surface guide rail, a flight, and an end flight. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the sludge scraper according to the present invention will be described in detail with reference to the drawings. Note that the structures of the settling tank, sludge scraper and settling tank equipment described in the embodiment are merely examples for the purpose of explaining the sludge scraper according to the present invention, and are not limited thereto.

[0017] [First embodiment] The present invention relates to a sludge scraper. First, an outline of a settling basin 50 and a sludge scraper 10 will be described with reference to FIG. FIG. 1 is a schematic diagram showing a longitudinal section of a sedimentation tank having a sludge scraper as a typical example of a sedimentation tank facility according to an embodiment of the present invention. As shown in FIG. 1, a sludge collector 10 according to an embodiment of the present invention is installed inside a settling basin 50 in a sewage treatment plant, a water purification plant, or the like.

[0018] (Sedimentation tank) The sedimentation basin 50 is long horizontally, and water to be treated, such as sewage, is supplied to it from the left side of Fig. 1. A sludge pit 50b is provided at the end of the bottom 50a of the sedimentation basin 50 on the supply side of the water to be treated, and a discharge pipe 50c is provided in the sludge pit 50b for discharging the sludge to the outside. The settling basin 50 in this embodiment is equipped with a sludge collector 10, which collects sludge that has accumulated on the bottom 50a of the settling basin 50. A scum discharger 61 consisting of a scum pipe that can rotate around its axis is provided in the vicinity of the water surface 50d at the approximate center of the sedimentation basin 50 across the entire width of the sedimentation basin 50 in the width direction (perpendicular to the paper surface). An opening extending in the axial direction is formed in the upper peripheral surface of this scum pipe, and its cross section is C-shaped. In order to collect floating matter (scum) floating on the water surface 50d, the scum pipe rotates counterclockwise in FIG. 1 so that the opening is positioned below the water surface 50d, and then repeats the returning motion.

[0019] (Sludge collector) The sludge scraper 10 according to one embodiment of the present invention has four shafts: a drive shaft 54 ​​installed near the water surface 50d of the tank forming the sedimentation basin 50, a driven shaft 55a installed upstream of the scum discharger 61 near the water surface 50d at a predetermined distance from the drive shaft 54, a driven shaft 55b installed near the sludge pit 50b, and a driven shaft 55c installed near the pond bottom 50a at a predetermined distance from the driven shaft 55b. A pair of chains 31 are stretched around the drive shaft 54 ​​and the driven shafts 55a, 55b, and 55c and run around the water surface 50d and the pond bottom 50a of the sedimentation basin 50.

[0020] FIG. 2 shows a schematic front view of a chain flight type sludge collector. The chain, chain support member, flight shoe, and water surface guide rail are provided in pairs along both side walls of the settling basin 50, and support one flight 32 near the ends on both sides. Fig. 3 explains one chain, flight, chain support member, flight shoe, and water surface guide rail, but in the following explanation, the explanation of the chain 31, flight 32, chain support member 23, flight shoe 21, water surface guide rail 22, and regulating members on one side wall side also applies to the explanation of the chain, flight, chain support member, flight shoe, water surface guide rail, and regulating members on the other side wall side. For ease of explanation, FIG. 3 illustrates the chain, flights, chain support member, flight shoe, and water surface guide rail that are provided along the right side wall of the settling basin 50 when facing upstream. That is, Figure 3 shows a chain flight type sludge scraper 10, which is arranged along the right side wall facing upstream of the settling tank 50, and has a chain 31, a flight 32, an end flight 34, a chain support member 23, a flight shoe 21, and a water surface guide rail 22.

[0021] A plurality of flights 32 are attached to the chain 31 at regular intervals. As the chain 31 moves, each flight 32 moves around the vicinity of the water surface 50d and the vicinity of the pond bottom 50a of the settling pond 50, and collects scum and sludge. More specifically, the flight 32 moves in the forward direction of the water flow near the water surface 50d, and moves in the opposite direction to the water flow near the pond bottom 50a. When the flight 32 moves in the forward direction of the water flow near the water surface 50d, it collects scum floating on the water surface 50d to the scum discharger 61, and when it moves in the opposite direction to the water flow near the pond bottom 50a, it collects sludge accumulated on the pond bottom 50a to the sludge pit 50b. The sludge collected by the flight 41 and the end flight 42 is stored in the sludge pit 50b.

[0022] FIG. 3 is a schematic diagram showing the structure of the chain, the chain support member, the flight shoe, the water surface guide rail, and the flight. The sludge scraper 10 includes a chain 31, a chain support member 23, a flight shoe 21, a water surface guide rail 22, and a flight 32. A portion of the flight 32 between one chain and the other chain is called a flight center portion 32a, and portions of the flight 32 that extend from the chain toward the settling tank side wall 51 at both ends are called flight end portions 32b. In the embodiment shown in Fig. 3, the chain 31 is provided between the flight center portion 32a and the flight end portion 32b, and the flight center portion 32a and the flight end portion 32b are spaced apart, but the flight center portion 32a and the flight end portion 32b may be structured to be continuous as one unit.

[0023] The chain 31 is a so-called endless chain. The chain 31 is provided along the longitudinal side wall of the settling basin 50. The chain 31 extends in a direction perpendicular to the plane of the paper in FIG. A chain 31 is provided along the left and right side walls of the settling tank 50 and is wound around a drive shaft 54 ​​and driven shafts 55a, 55b, and 55c. When the motor sprocket 56a is driven to rotate by the motor 56, the drive chain 57 runs in the settling tank 50 in the direction of the arrow shown in Figure 1. The drive chain 57 drives the drive shaft 54, causing the chain 31 of the sludge scraper 10 to run in the direction of the arrow shown in Figure 1.

[0024] The chain 31 supports the flight 32. In the embodiment shown in Fig. 3, the flight 32 is fixedly supported at an end of a flight center portion 32a to the chain 31 via a flight attachment 33. In addition, the flight end portion 32b is fixedly supported via a flight support portion 32c to a right outer plate, which is a component of the chain 31. When the chain 31 runs, the flight 32 runs along with it.

[0025] The material of the chain 31 may be stainless steel (SUS material) or general structural rolled steel (SS material). In addition, other materials such as resin materials may be used as long as sufficient strength is obtained. By using modified polyphenylene ether, a chain with excellent sulfuric acid resistance can be obtained. Modified polyphenylene ether is a general term for synthetic resin polymer alloys belonging to thermoplastic resins containing polyphenylene ether having an aromatic polyether structure. Examples of resin components other than polyphenylene ether contained in modified polyphenylene ether include polystyrene resin, high impact polystyrene resin, polyamide resin, polypropylene resin, polyester resin, polyacetal resin, polyphenylene sulfide resin, and fluororesin.

[0026] The preferred modified polyphenylene ether is a polymer alloy containing high-impact polystyrene resin, polyamide resin, polyester resin, or polypropylene resin, and the most preferred modified polyphenylene ether is a polymer alloy containing high-impact polystyrene resin. The high-impact polystyrene resin is a resin obtained by blending or copolymerizing a rubber component with a polystyrene resin.

[0027] The chain support member 23 supports the chain 31 by making sliding contact with it. The chain 31 runs by sliding on the upper surface of the chain support member 23. The chain support member 23 is fixed at its lower part to the left side of the lower guide part 22c of the water surface guide rail 22. The chain support member 23 is fixed to the lower guide part 22c by tightening with a bolt, for example. The chain support member 23 extends in a direction perpendicular to the plane of the paper in Fig. 3. The chain support member 23 may be provided over the entire length of the straight portion between the drive shaft 54 ​​and the driven shaft 55a and the straight portion between the driven shaft 55b and the driven shaft 55c, or may be provided on a part of the straight portion. The chain support member 23 is made of a wear-resistant material since it comes into sliding contact with the chain 31.

[0028] As shown in Fig. 2, the flight 32 has an elongated shape as a whole. More specifically, the longitudinal direction of the flight 32 is the direction in which the left and right side walls face each other toward the upstream side of the settling basin 50. In the embodiment shown in Fig. 3, the flight 32 is fixedly attached to the left outer plate of the chain 31 via a flight attachment 33. The flight 32 is made of metal such as stainless steel, or resin such as fiber-reinforced plastic. The flight 32 is a member having a U-shaped cross section perpendicular to the longitudinal direction. If the surface where the horizontal part of the U-shaped cross section of the flight 32 extends is the back surface and the opposite side is the front surface, the flight 32 moves in the forward direction of the water flow in the vicinity of the water surface 50d of the settling tank 50, scraping up scum floating on the water surface 50d, and then changes course to the pond bottom 50a after passing the driven shaft 55a, and after passing the driven shaft 55b, moves in the opposite direction to the water flow of the settling tank 50, scraping up sludge on the pond bottom 50a toward the sludge pit 50b.

[0029] A flight support portion 32c is formed on the flight end portion 32b of the flight 32. The flight support portion 32c has a substantially L-shaped cross section. The right outer plate portion of the chain 31 and the left surface of the flight support portion 22c are fixedly attached. The flight support portion 32c is also part of the structure of the side plate of the chain 31. The flight shoe 21 is fixedly attached to the bottom surface of the flight support portion 32c via the lower end horizontal portion of the flight support portion 32c. The flight shoe 21 extends to the right from the lower end of the flight support portion 32c, and its bottom surface is supported in sliding contact with the upper surface of the water surface guide rail 22.

[0030] 3, the right side surface of the lower part of the flight attachment 33, which is also part of the left side plate of the chain 31, comes into contact with the left side surface of the chain support member 23, thereby stopping the movement, and the left movement of the flight 32 is restricted when the left side surface of the flight shoe 21 comes into contact with the right side surface of the chain support member 23, thereby stopping the movement.

[0031] The end flight 34 is preferably made of stainless steel (SUS material), but may be made of general structural rolled steel (SS material). As long as sufficient strength is obtained, other materials such as resin may be used.

[0032] As an example of the regulating member in the water surface guide rail 22, for example, a cross section of a substantially J-shape rotated 90° as shown in FIG. 3 is preferable. Specifically, the water surface guide rail 22 is structured to include a side wall guide portion 22a, an upper guide portion 22b, and a lower guide portion 22c. The upper guide portion 22b and the lower guide portion 22c extend leftward relative to the side wall guide portion 22a with respect to the paper surface of FIG. 3. The lower guide portion 22c extends relatively longer than the upper guide portion 22b. The upper guide portion 22b regulates the upward movement of the lower end horizontal portion of the flight support portion 32c. This is because when the flight 32 and the chain 31 attempt to move upward, the upper surface of the lower end horizontal portion of the flight support portion 32c abuts against the lower surface of the upper guide portion 22b, stopping the upward movement. The side wall guide portion 22a regulates the movement of the lower end horizontal portion of the flight support portion 32c toward the sedimentation tank side wall 51 side. This is because, when the flight 32 and chain 31 attempt to move rightward on the paper surface of Fig. 3, the right end face of the lower horizontal part of the flight support part 32c abuts against the left side face of the side wall guide part 22a, stopping the movement to the right. The lower guide part 22c has a width sufficient to support the chain support member 23, the flight support part 32c, and the flight shoe 21. The water surface guide rail 22 extends in a direction perpendicular to the paper surface of Fig. 3.

[0033] As another specific shape of the regulating member, the cross-sectional shape of the end of the water surface guide rail 22 on the side wall 51 of the sedimentation tank may be a substantially U-shape with its back to the side wall 51 of the sedimentation tank. The lower surface of the upper horizontal part of the U-shape abuts against the upper surface of the lower horizontal part of the flight support part 32c, stopping the upward movement and regulating the upward movement. The left side surface of the vertical part of the U-shape abuts against the right end surface of the flight support part 32c, stopping the movement and regulating the movement of the lower horizontal part towards the side wall 51 of the sedimentation tank.

[0034] As another shape of the restricting member, the cross-sectional shape of the end of the water surface guide rail 22 on the side wall 51 of the sedimentation tank may be an approximately U-shape rotated 90° to the left. The lower surface of the upper horizontal part of the approximately U-shape rotated left abuts against the upper surface of the lower horizontal part of the flight support part 32c, stopping the upward movement and restricting the upward movement. The left side surface of the arc-shaped curved part of the approximately U-shape rotated left 90° abuts against the right end surface of the flight support part 32c, stopping the movement and restricting the movement of the lower horizontal part towards the side wall 51 of the sedimentation tank.

[0035] The water surface guide rail 22 is preferably made of stainless steel (SUS material), but may be made of general structural rolled steel (SS material). In addition, other materials such as resin materials may be used as long as sufficient strength is obtained.

[0036] The water surface guide rail 22 has its lower portion fixed and supported by a water surface guide rail bracket 52. The water surface guide rail bracket 52 is fixed and supported on a side wall 51 of the sedimentation basin. That is, the chain support member 23 and the water surface guide rail 22 are fixed and supported integrally to the sedimentation basin side wall 51 via the water surface guide rail support member 24 and the water surface guide rail bracket 52.

[0037] (Operation of sludge collector 10) The operation of this embodiment configured as above will be described. The chain 31 slides and travels on the chain support member 23 . When the flight 32 and chain 31 move upward and left and right in the running direction, the movement of the flight 32 and chain 31 to the right is regulated by the end face of the lower horizontal part of the flight 32c, which is fixed to the chain 31, on the sedimentation tank side wall side abutting the left face of the side wall side guide portion 22a of the water surface guide rail 22. The movement of the flight 32 and the chain 31 to the left is restricted by the lower part of the left surface of the flight support portion 32 c fixed to the chain 31 abutting against the right surface of the chain support member 23 . The upward movement of the flight 32 and chain 31 is regulated by the upper surface of the lower end horizontal part of the flight support part 32c of the flight end part 32b fixed to the chain 31 abutting the lower surface of the horizontal guide part 22a of the water surface guide rail 22.

[0038] If an earthquake occurs while the sludge scraper 10 is in operation, causing the liquid surface to slosh, the chain 31 will move up and down and left and right due to the sloshing of the water in the settling basin 50. The configuration of the chain 31, chain support member 23, flight shoe 21, and water surface guide rail 22 regulates the up and down and left and right movements of the chain 31, preventing the chain 31 from falling off the water surface guide rail 22.

[0039] [Second embodiment] A flight shoe support member 21A (not shown) may be provided on the lower surface of the flight shoe 21. The underside of the flight shoe 21 slides in contact with the upper surface of the lower guide portion 22c of the water surface guide rail 22. Due to friction caused by the sliding, even if the flight shoe support member 21A placed on the upper surface of the water surface guide rail 22 wears out, the upper surface of the water surface guide rail 22 can be prevented from wearing out, and in maintenance, it is only necessary to replace the flight shoe support member 21A, making part replacement easier than replacing the water surface guide rail 22 itself.

[0040] (others) The sludge scraper in the settling tank facility of this embodiment is not limited to a chain flight type sludge scraper equipped with a flight and an endless chain, as long as it can scrape sludge accumulated on the bottom of the settling tank. For example, it may be a sludge scraper that reciprocates on the bottom of the settling tank, or a two-shaft or three-shaft chain flight type sludge scraper. [Industrial Applicability]

[0041] The sludge scraper of the present invention is used to scrape sludge in settling ponds in, for example, sewage treatment plants, wastewater treatment plants, water purification plants and the like. The sedimentation tank facility of the present invention is used for treating solid-containing water to be treated in a sedimentation tank of a sewage treatment plant, a wastewater treatment plant, a water purification plant, etc. More specifically, the sedimentation tank facility is used for scraping up sludge accumulated on the bottom of the sedimentation tank. [Explanation of symbols]

[0042] 10...sludge collector, 21...flight shoe, 22...water surface guide rail, 22a...side wall guide portion, 22b...upper guide portion, 22c...lower guide portion, 23...chain support member, 24...water surface guide rail support member, 31...chain, 32...flight, 32a...flight center portion, 32b...flight end portion, 32c...flight support portion, 33...flight attachment, 41...pond bottom guide rail, 50...sedimentation tank, 50a...pond bottom, 50b...sludge pit, 50c...discharge pipe, 50d...water surface, 51...sedimentation tank side wall, 52...water surface guide rail bracket, 54...drive shaft, 54a...drive sprocket, 55a...driven shaft, 55b...driven shaft, 55c...driven shaft, 56...motor. 56a...motor sprocket, 57...drive chain

Claims

1. a flight for scraping sludge or scum; A chain supporting the flight; A chain support member that supports the chain; A flight shoe provided at a lower end of the flight; a water surface guide rail that supports the chain support member and the flight shoe from the bottom surface; A sludge scraper comprising:

2. The flight has a structure that restricts the flight from moving in the left or right direction. The sludge scraper according to claim 1.

3. 2. The sludge scraper according to claim 1, wherein the water surface guide rail has a restricting member that restricts the upward and left-right movement of the flight.

4. The chain support member is fixed to the water surface guide rail. A sludge scraper according to any one of claims 1 to 3.

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