Scum scraping device

Abstract

To provide a scum scraping device that can continuously scrape scum at a constant speed. [Solution] The scum scraping device (101) includes arms (14, 15) that connect the flight (1) and the running chains (12, 13). One end of each arm (14, 15) is fixed to the flight (1), the other end is rotatably attached to the running chains (12, 13), and the middle part is rotatably attached to the side wall members (25, 26) of the trolley (16). As the running chains (12, 13) travel between the first running sprockets (8, 9) and the second running sprockets (10, 11), the flight (1) scrapes up the scum floating on the surface of the sedimentation tank.

Description

Technical Field

[0001] The present invention relates to a scum scraping device installed in a sedimentation tank of a sewage treatment facility or the like.

Background Art

[0002] As a technology related to a scum scraping device, for example, there is the technology described in Patent Document 1. The scum scraping device described in Patent Document 1 includes a guide rail, a carriage that supports a scraping plate swingably, and a carriage reciprocating mechanism that reciprocates the carriage. The carriage reciprocating mechanism is composed of a reciprocating member provided with a plurality of feed claws and a ratchet or the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, in the scum scraping device described in Patent Document 1, due to its structure, the scraping plate does not move continuously at a constant speed. The scraping plate is intermittently fed by the carriage reciprocating mechanism. Therefore, the scraping plate scrapes the scum while intermittently repeating moving and stopping.

[0005] An object of the present invention is to provide a scum scraping device that can continuously scrape scum at a constant speed.

Means for Solving the Problems

[0006] (1) The scum scraping device disclosed herein comprises: rails installed along the longitudinal direction of a sedimentation tank; a trolley with wheels attached that runs on the rails; a flight for scraping scum floating on the surface of the sedimentation tank; an arm connecting the flight and a running chain, the arm having one end fixed to the flight, the other end rotatably attached to the running chain, and the middle portion rotatably attached to a side wall member of the trolley; a first running sprocket on which the running chain is attached; a second running sprocket positioned at a distance from the first running sprocket in the longitudinal direction and on which the running chain is attached; and a driving means for rotationally driving the first running sprocket. The flight scrapes the scum as the running chain runs between the first running sprocket and the second running sprocket.

[0007] (2) The scum scraping device disclosed herein may have the following configuration in addition to the configuration of (1) above: It further comprises an upper chain guide that is located between the first travel sprocket and the second travel sprocket and is positioned above a virtual straight line connecting the center of the first travel sprocket and the center of the second travel sprocket, and supports the travel chain from below.

[0008] (3) The scum scraping device disclosed herein may have the following configuration in addition to the configuration of (1) or (2) above: a lower chain guide located between the first travel sprocket and the second travel sprocket, positioned below a virtual straight line connecting the center of the first travel sprocket and the center of the second travel sprocket, which restricts the upward movement of the travel chain.

[0009] (4) The scum scraping device disclosed herein may have the following configuration in addition to any of the configurations described in (1) to (3) above: A guide roller is attached to the traveling chain to prevent the traveling chain from contacting the upper surface of the rail.

[0010] (5) The scum scraping device disclosed herein may have the following configuration in addition to any of the configurations described in (1) to (4) above: The driving means comprises a drive sprocket driven by a drive device and a drive shaft to which the drive sprocket and the first travel sprocket are attached. [Effects of the Invention]

[0011] According to this invention, a scum scraping device can be provided that can continuously scrape up scum at a constant speed. [Brief explanation of the drawing]

[0012] [Figure 1] This is a perspective view of a scum scraping device according to one embodiment of the present invention. [Figure 2] Figure 1 is a front view of the arm section of the scum scraping device. [Figure 3] This is an enlarged view of section A in Figure 2. [Figure 4] Figure 1 is a diagram illustrating the operation of the scum scraping device. [Figure 5] Figure 1 is a diagram illustrating the operation of the scum scraping device. [Modes for carrying out the invention]

[0013] The embodiments for implementing this invention will be described below with reference to the drawings.

[0014] The scum scraping device of this invention is installed in sedimentation tanks in sewage treatment facilities and the like. The scum scraping device is a device that scrapes scum floating on the surface of the sedimentation tank down to the scum gaps.

[0015] Figures 1 to 3 are diagrams for explaining the configuration of a scum scraping device 101 according to an embodiment of the present invention. In FIG. 1, the drive chain 20 shown in FIG. 2 is not shown. The scum scraping device 101 includes a flight 1, a drive mechanism 2 for driving the flight 1, and a base 3 for supporting the drive mechanism 2.

[0016] The flight 1 is a plate-shaped object that scrapes the scum floating on the water surface of the sedimentation tank. The flight 1 may be made of metal or resin. The material of the flight 1 is not particularly limited. The flight 1 may be composed of a plurality of members or may be composed of one member. The flight 1 of the present embodiment is composed of a plurality of members.

[0017] The base 3 is composed of a pair of left and right rails 4, 5 and a gantry 6. The gantry 6 is arranged between the rail 4 and the rail 5. The gantry 6 and the rails 4, 5 are fixed by welding or the like. The base 3 is arranged along the longitudinal direction of the sedimentation tank. That is, the rails 4, 5, and the gantry 6 are all arranged along the longitudinal direction of the sedimentation tank. Also, the base 3 is arranged above the water surface of the sedimentation tank. That is, the rails 4, 5, and the gantry 6 are all arranged above the water surface of the sedimentation tank.

[0018] The rail 4 and the rail 5 are parts of the same shape and dimensions. The rails 4, 5 have rail grooves 4a, 5a on their side surfaces. The rails 4, 5 of the present embodiment are H-shaped steel, but the rails 4, 5 are not limited to H-shaped steel.

[0019] The drive mechanism 2 includes a drive means 7, a pair of left and right first running sprockets 8, 9, a pair of left and right second running sprockets 10, 11, a pair of left and right running chains 12, 13, a pair of left and right arms 14, 15, and a carriage 16.

[0020] The first traveling sprocket 8 and the first traveling sprocket 9 are parts with the same shape and dimensions. Similarly, the second traveling sprocket 10 and the second traveling sprocket 11 are parts with the same shape and dimensions. The traveling chain 12 and the traveling chain 13 are parts with the same shape and dimensions. Also, the arm 14 and the arm 15 are parts with symmetric shapes to each other.

[0021] The driving means 7 is a device that rotationally drives the first traveling sprockets 8 and 9. The driving means 7 includes a driving sprocket 17 and a driving shaft 18. The driving sprocket 17 and the first traveling sprockets 8 and 9 are attached to the driving shaft 18. In this embodiment, the driving sprocket 17 is attached to the central portion of the driving shaft 18. Also, the first traveling sprocket 8 is attached to one end of both ends of the driving shaft 18, and the first traveling sprocket 9 is attached to the other end.

[0022] The driving shaft 18 is supported by a bearing member 19. The driving shaft 18 is rotatably supported by two bearing members 19. The bearing member 19 is fixed to the gantry 6.

[0023] The driving sprocket 17 is driven by a driving device (not shown). The driving device is installed, for example, above the sedimentation tank. A sprocket (not shown) attached to the driving device and the driving sprocket 17 are connected by a driving chain 20. The driving device is, for example, an electric motor with a speed reducer.

[0024] The driving sprocket 17 is rotationally driven via the driving chain 20 by a driving device (not shown). When the driving sprocket 17 rotates, the first traveling sprockets 8 and 9 rotate.

[0025] The second travel sprockets 10 and 11 are positioned at a distance from the first travel sprockets 8 and 9 in the longitudinal direction of the sedimentation tank. The second travel sprockets 10 and 11 are attached to the driven shaft 21. In this embodiment, the second travel sprocket 10 is attached to one end of the driven shaft 21, and the second travel sprocket 11 is attached to the other end. The driven shaft 21 is supported by bearing members 22. The driven shaft 21 is rotatably supported by two bearing members 22. The bearing members 22 are fixed to the frame 6.

[0026] In this embodiment, both the second travel sprockets 10 and 11 are mounted on a single driven shaft 21. Alternatively, two driven shafts 21, each shorter than the first driven shaft 21, may be used, with one second travel sprocket 10 and 11 mounted on each of them.

[0027] The distance between the second travel sprockets 10 and 11 and the first travel sprockets 8 and 9 is the distance over which Flight 1 scrapes up scum floating on the surface of the sedimentation tank. Increasing the distance between the second travel sprockets 10 and 11 and the first travel sprockets 8 and 9 increases the distance over which Flight 1 scrapes up scum. The distance between the second travel sprockets 10 and 11 and the first travel sprockets 8 and 9 is determined as appropriate. The distance between the second travel sprockets 10 and 11 and the first travel sprockets 8 and 9 is determined by the type of chain flight type sludge scraper (not shown) installed in the sedimentation tank, the amount of scum generated in the sedimentation tank, etc.

[0028] The running chains 12 and 13 are attached to the first running sprockets 8 and 9, and also to the second running sprockets 10 and 11. When the first running sprockets 8 and 9 are rotated by the drive means 7, the running chains 12 and 13 travel between the first running sprockets 8 and 9 and the second running sprockets 10 and 11. The running chains 12 and 13 are endless chains in which multiple chain links are connected endlessly.

[0029] Guide rollers 23 are attached to each of the running chains 12 and 13. Multiple guide rollers 23 are attached to each of the running chains 12 and 13 at predetermined intervals. The guide rollers 23 prevent the running chains 12 and 13 from contacting the upper surfaces of the rails 4 and 5. The guide rollers 23 are attached to the running chains 12 and 13 by pin members 24. The guide rollers 23 are rotatable around the pin members 24. The material of the guide rollers 23 is resin. The material of the guide rollers 23 is ultra-high molecular weight polyethylene. However, the material of the guide rollers 23 is not limited to resin.

[0030] The bogie 16 has a pair of side wall members 25 and 26 and a connecting member 27 that connects the side wall members 25 and 26 to each other. The bogie 16 has a plurality of wheels 28. The wheels 28 are rotatably mounted on both ends of the side wall members 25 and 26 in the longitudinal direction. The wheels 28 are positioned in the rail grooves 4a and 5a so that they run on the rail grooves 4a and 5a of the rails 4 and 5. Note that the mounting positions of the wheels 28 are not limited to both ends of the side wall members 25 and 26 in the longitudinal direction.

[0031] Arms 14 and 15 connect Flight 1 to the drive chains 12 and 13. Arms 14 and 15 are a pair of symmetrical and similar parts. Therefore, arm 14 will be described as an example. For the configuration of arm 15, please refer to the description of arm 14.

[0032] One end of the arm 14 is fixed to the flight 1, the other end is rotatably attached to the running chain 12, and the middle part is rotatably attached to the side wall member 25 of the trolley 16.

[0033] The arm 14 in this embodiment is composed of a first member 29 and a second member 30. The first member 29 is a hollow box-shaped member, and the second member 30 is a plate-shaped member. The first member 29 and the second member 30 are connected and fixed to each other at their ends. In this embodiment, the second member 30 is connected and fixed to the first member 29 at a slight angle to it. That is, in this embodiment, the arm 14 is in the shape of a V. However, the shape of the arm 14 is not limited to a V shape.

[0034] The lower end of the first member 29, which is one end of the arm 14, is fixed to the flight 1. The upper end of the first member 29 is rotatably attached to the side wall member 25 of the trolley 16. The upper end of the first member 29 is the middle part of the arm 14. In this embodiment, as shown in the left arm 15 in Figure 3, the upper end of the first member 29 is rotatably attached to the side wall member 25 of the trolley 16 using a pin member 31 and a bearing member 32. The bearing member 32 is positioned inside the first member 29. The pin member 31 is positioned to pass through the first member 29 and the bearing member 32, and the shaft end of the pin member 31 is fixed to the side wall member 25. The arm 14 is rotatable around the pin member 31. The material of the bearing member 32 is resin. The material of the bearing member 32 is ultra-high molecular weight polyethylene. However, the material of the bearing member 32 is not limited to resin.

[0035] The upper end of the second member 30, which is the other end of the arm 14, is rotatably attached to the running chain 12. In this embodiment, as shown in the left arm 15 in Figure 3, the upper end of the second member 30 is rotatably attached to the running chain 12 using a pin member 33, a bush 34, and a connecting member 35. The pin member 33 is positioned to pass through the second member 30, and the shaft end of the pin member 33 is fixed to the connecting member 35. The arm 14 is rotatable around the pin member 33. The material of the bush 34 is resin. The material of the bush 34 is ultra-high molecular weight polyethylene. However, the material of the bush 34 is not limited to resin.

[0036] As shown in Figure 1, the drive mechanism 2 of this embodiment further includes a pair of left and right upper chain guides 36 and 37. The upper chain guides 36 and 37 support the running chains 12 and 13 from below. The upper chain guides 36 and 37 are located between the first running sprockets 8 and 9 and the second running sprockets 10 and 11, and are positioned above a virtual straight line L connecting the centers of the first running sprockets 8 and 9 and the centers of the second running sprockets 10 and 11.

[0037] In this embodiment, the upper chain guides 36 and 37 are elongated plate-shaped objects. The upper chain guides 36 and 37 are supported by a support member 38. The support member 38 is fixed to the frame 6. The material of the upper chain guides 36 and 37 is resin. The material of the upper chain guides 36 and 37 is ultra-high molecular weight polyethylene. However, the material of the upper chain guides 36 and 37 is not limited to resin.

[0038] As shown in Figure 1, the drive mechanism 2 of this embodiment further includes a pair of left and right lower chain guides 39 and 40. The lower chain guides 39 and 40 restrict the upward movement of the running chains 12 and 13. The lower chain guides 39 and 40 are positioned below the upper chain guides 36 and 37. The lower chain guides 39 and 40 are located between the first running sprockets 8 and 9 and the second running sprockets 10 and 11, and are positioned below the imaginary straight line L connecting the centers of the first running sprockets 8 and 9 and the centers of the second running sprockets 10 and 11.

[0039] In this embodiment, the lower chain guides 39 and 40 are elongated plate-shaped objects. The lower chain guides 39 and 40 are supported by a support member 38. The material of the lower chain guides 39 and 40 is resin. The material of the lower chain guides 39 and 40 is ultra-high molecular weight polyethylene. However, the material of the lower chain guides 39 and 40 is not limited to resin.

[0040] The upper chain guides 36 and 37 and the lower chain guides 39 and 40 are supported by a common support member 38, but the upper chain guides 36 and 37 and the lower chain guides 39 and 40 may be supported by separate support members.

[0041] The operation of the scum scraping device 101 will be described with reference to Figures 4 and 5. In the scum scraping device 101, the travel chains 12 and 13 travel between the first travel sprockets 8 and 9 and the second travel sprockets 10 and 11, so that the flight 1 scrapes up the scum floating on the surface of the sedimentation tank.

[0042] Figure 4 illustrates the start of scum removal by the scum removal device 101. Figure 5 illustrates the end of scum removal by the scum removal device 101. In Figures 4 and 5, not all of the running chains 12 and 13 are shown; only some of the running chains 12 and 13 are depicted.

[0043] In Figures 4 and 5, the position and orientation of the arms 14 and 15 of the scum scraping device 101 change, for example, from Figure 4(a) as the reference point, to Figure 4(a) to Figure 4(b), from Figure 4(b) to Figure 4(c), from Figure 4(c) to Figure 5(a), from Figure 5(a) to Figure 5(b), from Figure 5(b) to Figure 5(c), and from Figure 5(c) to Figure 4(a).

[0044] The drive sprocket 17 is rotationally driven via the drive chain 20 by a drive device (not shown in the figures). As the drive sprocket 17 rotates, the first travel sprockets 8 and 9, which are connected to the drive sprocket 17 via the drive shaft 18, also rotate. In this embodiment, the first travel sprockets 8 and 9 are rotationally driven clockwise in Figures 4 and 5. When the first travel sprockets 8 and 9 are rotationally driven clockwise, the travel chains 12 and 13 stretched between the first travel sprockets 8 and 9 and the second travel sprockets 10 and 11, the portion of the travel chains 12 and 13 below the imaginary straight line L connecting the centers of the first travel sprockets 8 and 9 and the centers of the second travel sprockets 10 and 11, travel from the first travel sprockets 8 and 9 towards the second travel sprockets 10 and 11.

[0045] Arms 14 and 15 are rotatably attached to the running chains 12 and 13 at their upper ends, and rotatably attached to the side wall members 25 and 26 of the trolley 16 at their middle ends. As a result, in the posture shown in Figures 5(c) and 4(a) (lying on their sides), arms 14 and 15 are pulled by the running chains 12 and 13 and move together with the trolley 16 from the first running sprockets 8 and 9 towards the second running sprockets 10 and 11. At this time, the flight 1 fixed to the lower ends of arms 14 and 15 is positioned above the water surface of the sedimentation tank. Therefore, the flight 1 does not disturb the water surface of the sedimentation tank.

[0046] When the running chains 12 and 13 attached to the upper ends of arms 14 and 15 reach the second running sprockets 10 and 11 (see Figure 4(b)), and reverse direction by moving along the second running sprockets 10 and 11, arms 14 and 15 rise up, assuming the posture shown in Figure 4(c). At this time, a portion of Flight 1 goes underwater.

[0047] Subsequently, arms 14 and 15, while maintaining the upright position shown in Figure 4(c), are pulled by the travel chains 12 and 13 and move together with the trolley 16 from the second travel sprockets 10 and 11 towards the first travel sprockets 8 and 9. During this process, flight 1 scoops up scum floating on the surface of the sedimentation tank.

[0048] When the travel chains 12 and 13 attached to the upper ends of arms 14 and 15 reach the first travel sprockets 8 and 9 (see Figure 5(a)), and reverse direction by moving along the first travel sprockets 8 and 9, arms 14 and 15 lie on their sides, assuming the posture shown in Figure 5(c). At this time, Flight 1 emerges from the water surface of the sedimentation tank into the air.

[0049] Subsequently, the arms 14 and 15, while remaining in the sideways position shown in Figure 5(c), are pulled by the travel chains 12 and 13 and move together with the trolley 16 from the first travel sprockets 8 and 9 towards the second travel sprockets 10 and 11.

[0050] (effect) The scum scraping device 101 of this embodiment provides the following effects.

[0051] (1) The scum scraping device 101 includes arms 14 and 15 that connect the flight 1 to the running chains 12 and 13. One end of each arm 14 and 15 is fixed to the flight 1, the other end is rotatably attached to the running chains 12 and 13, and the middle part is rotatably attached to the side wall members 25 and 26 of the trolley 16. As the running chains 12 and 13 travel between the first running sprockets 8 and 9 and the second running sprockets 10 and 11, the flight 1 fixed to one end of each arm 14 and 15 scrapes up the scum floating on the surface of the sedimentation tank. With the scum scraping device 101, the flight 1 can be moved continuously at a constant speed, and thus the scum can be scraped up continuously at a constant speed by the flight 1.

[0052] (2) The scum scraping device 101 is located between the first travel sprockets 8 and 9 and the second travel sprockets 10 and 11, and is positioned above a virtual straight line L connecting the centers of the first travel sprockets 8 and 9 and the centers of the second travel sprockets 10 and 11, and includes upper chain guides 36 and 37 that support the travel chains 12 and 13 from below.

[0053] According to this, when the running chains 12 and 13, to which the arms 14 and 15 are attached, travel between the first running sprockets 8 and 9 and the second running sprockets 10 and 11, above the virtual straight line L, the weight of the flight 1 and the arms 14 and 15 causes the running chains 12 and 13 to bend downward, which can prevent the arms 14 and 15 from losing their proper posture. In other words, the scum scraping device 101 is equipped with upper chain guides 36 and 37, making it easier to maintain the proper posture of the arms 14 and 15.

[0054] (3) The scum scraping device 101 is located between the first travel sprockets 8 and 9 and the second travel sprockets 10 and 11, and is positioned below the imaginary straight line L connecting the centers of the first travel sprockets 8 and 9 and the centers of the second travel sprockets 10 and 11, and includes lower chain guides 39 and 40 that restrict the upward movement of the travel chains 12 and 13.

[0055] According to this, when the running chains 12 and 13 to which the arms 14 and 15 are attached travel between the first running sprockets 8 and 9 and the second running sprockets 10 and 11, and below the virtual straight line L, the weight of the flight 1 and the arms 14 and 15 causes the running chains 12 and 13 to bend upward, which can prevent the arms 14 and 15 from losing their proper posture. In other words, the scum scraping device 101 is equipped with lower chain guides 39 and 40, making it easier to maintain the proper posture of the arms 14 and 15.

[0056] (4) In addition, guide rollers 23 are attached to the traveling chains 12 and 13 in the scum scraping device 101 to prevent the traveling chains 12 and 13 from coming into contact with the upper surfaces of the rails 4 and 5.

[0057] According to this, it is possible to suppress the contact between the running chains 12 and 13 and the rails 4 and 5, thereby preventing damage to the upper surfaces of the rails 4 and 5. In addition, the frictional force between the running chains 12 and 13 and the rails 4 and 5 can be reduced, allowing the running of the running chains 12 and 13 to be smoother.

[0058] (5) The drive means 7 comprises a drive sprocket 17 driven by a drive device, and a drive shaft 18 to which the drive sprocket 17 and the first travel sprockets 8 and 9 are attached.

[0059] According to this, the drive means 7 that rotates the first travel sprockets 8 and 9 can be configured with a simple structure.

[0060] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The present invention is not limited to the embodiments described above, and various modifications are possible without departing from its spirit.

[0061] For example, the above embodiment can be modified as follows:

[0062] The scum scraping device 101 in the above embodiment is equipped with a pair of left and right rails 4, 5, a pair of left and right first travel sprockets 8, 9, a pair of left and right second travel sprockets 10, 11, a pair of left and right travel chains 12, 13, a pair of left and right arms 14, 15, a pair of left and right upper chain guides 36, 37, and a pair of left and right lower chain guides 39, 40, with each component (member) provided in pairs, i.e., two of each. Alternatively, the rails 4, 5, first travel sprockets 8, 9, second travel sprockets 10, 11, travel chains 12, 13, arms 14, 15, upper chain guides 36, 37, and lower chain guides 39, 40 may be composed of only one side, rather than a pair. In other words, the rails 4 and 5, the first running sprockets 8 and 9, the second running sprockets 10 and 11, the running chains 12 and 13, the arms 14 and 15, the upper chain guides 36 and 37, and the lower chain guides 39 and 40 may each be composed of only one part (component), rather than being a pair. [Explanation of symbols]

[0063] 1: Flight 4, 5: Rails 7: Driving means 8, 9: First running sprocket 10, 11: Second running sprocket 12, 13: Running chains 14, 15: Arm 16: Dolly 17: Drive sprocket 18: Drive shaft 23: Guide roller 25, 26: Side wall members 28: Wheels 36, 37: Upper chain guide 39, 40: Lower chain guide 101: Scum scraping device L: virtual line

Claims

1. Rails installed along the longitudinal direction of the sedimentation tank, A trolley equipped with wheels that run on the aforementioned rails, Flights that rake up scum floating on the surface of the sedimentation tank, An arm connecting the flight and the running chain, wherein one end is fixed to the flight, the other end is rotatably attached to the running chain, and the middle part of the arm is rotatably attached to the side wall member of the trolley, The first travel sprocket on which the aforementioned travel chain is attached, A second travel sprocket is positioned at a distance from the first travel sprocket in the longitudinal direction, and the travel chain is attached to it. A drive means for rotationally driving the first travel sprocket, Equipped with, As the travel chain moves between the first travel sprocket and the second travel sprocket, the flight scrapes up the scum. Scum scraping device.

2. In the scum scraping device according to claim 1, The system further includes an upper chain guide positioned between the first travel sprocket and the second travel sprocket, above a virtual straight line connecting the center of the first travel sprocket and the center of the second travel sprocket, and supporting the travel chain from below. Scum scraping device.

3. In the scum scraping device according to claim 1 or 2, The system further includes a lower chain guide positioned between the first travel sprocket and the second travel sprocket, below a virtual straight line connecting the center of the first travel sprocket and the center of the second travel sprocket, which restricts the upward movement of the travel chain. Scum scraping device.

4. In the scum scraping device according to claim 1 or 2, A guide roller is attached to the running chain to prevent the running chain from contacting the upper surface of the rail. Scum scraping device.

5. In the scum scraping device according to claim 1 or 2, The aforementioned driving means is A drive sprocket driven by a drive unit, The drive shaft to which the drive sprocket and the first travel sprocket are attached, Equipped with, Scum scraping device.

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