High-speed settling device and method for manufacturing the same

Abstract

To provide a high-speed sedimentation apparatus which can shorten a construction period and reduce a construction cost, and a manufacturing method of the high-speed sedimentation apparatus.SOLUTION: A high-speed sedimentation apparatus 1 includes a separator 10 which is attached with a plurality of plates 30 on the outer peripheral surface of a cylinder 20 arranged in a sedimentation tank 2. The cylinder 20 is constituted by connecting a plurality of strip members 21 and forming a cylindrical shape. The separator 10 is attached so as to spirally wound the outer peripheral surface of the cylinder 20 by connecting a plurality of blade units 40 having spiral plates 30 attached to the outer surfaces of the strip members 21. The cylindrical cylinder 20 is assembled by sequentially connecting the strip member 21 of each blade unit 40 with each other in the vertical direction, and the separator 10 to which each spiral plate 30 is attached so as to spirally wound the outer peripheral surface of the cylinder 20 is assembled.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a high-rate settling device and a method for manufacturing a high-rate settling device. [Background technology]

[0002] Conventionally, as a sedimentation and concentration device for sewage treatment plants, water purification plants, and industrial wastewater treatment facilities, a high-speed sedimentation device has been known in which a separator with a spiral plate is placed inside a sedimentation tank and rotated to speed up sedimentation (solid-liquid separation) (see, for example, Patent Document 1).

[0003] If the spiral plates that make up the separator are made of fiber-reinforced plastic (FRP), a composite material containing resin and fiber, they may be subject to breakage or damage. Therefore, as a measure to prevent breakage or damage to the spiral plates, the separator is assembled by attaching each spiral plate to a cylindrical cylinder at the site where the high-speed settling device is being constructed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3291626 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional high-speed settling devices have the problem that the separators must be assembled by attaching spiral plates one by one to a cylinder at the site where the device is being constructed, which lengthens the construction period and increases construction costs.

[0006] An object of the present invention is to provide a high-speed settling device and a method for manufacturing a high-speed settling device that can solve the above-mentioned problems of breakage and damage during the manufacturing process and the transportation process from the manufacturing factory to the construction site, thereby shortening the construction period and reducing the construction cost. [Means for solving the problem]

[0007] In order to solve the above problems, the high-speed settling device of the present invention comprises a cylindrical settling tank with a bottom, and a separator disposed in the settling tank, with a plurality of plates attached to the outer circumferential surface of the cylinder. The cylinder is formed by connecting a plurality of strip-shaped members to form a cylindrical shape. The separator is formed by connecting a plurality of blade units each having the strip-shaped member and a spiral-shaped plate attached to the outer surface of the strip-shaped member, and the outer circumferential surface of the cylinder is formed by connecting a plurality of blade units. A plurality of the spiral-shaped plates It has a structure that can be attached so as to be wound in a spiral shape.

[0008] and, The cylinder is By sequentially connecting the strip-shaped members of each blade unit in the vertical direction, The separator is configured as follows: Each of the spiral plates is attached so as to spirally wrap around the outer circumferential surface of the cylinder. The belt-shaped member extends from the upper end to the lower end of the cylinder. Each of the spiral plates is made of a single flat plate that extends so as to wrap around the outer circumferential surface of the cylinder in a spiral shape.

[0009] Here, the spiral shape means a shape that traces a trajectory that rotates around the circumferential direction of the outer peripheral surface of a cylinder and has an angle in the vertical direction.

[0010] In the high-speed sedimentation device of the present invention, multiple sets of blade units are prepared, each having a spiral-shaped plate attached to the outer surface of a strip-shaped member, and the strip-shaped members of each blade unit are sequentially connected in the vertical direction, thereby assembling a cylindrical cylinder and assembling a separator in which each spiral-shaped plate is attached so as to wrap around the outer surface of the cylinder in a spiral shape.

[0011] This eliminates the need for the conventional, cumbersome process of attaching spiral plates one by one to a cylinder, simplifying the manufacturing of separators and reducing the construction time and costs of high-speed settling devices.

[0012] Furthermore, in the high-speed settling device of the present invention, the separator can be made of metal. That is, since the spiral plate is attached to the belt-shaped member, welding space can be easily secured when these are made of metal and the spiral plate can be reliably fixed by welding.

[0013] If, as in the past, the spiral plates were attached one by one by welding after forming a cylindrical cylinder, the spiral plates would be too close to each other, making it difficult to ensure sufficient welding space, and the locations where welding can be performed would be limited. In contrast, the present invention makes it easy to ensure welding space around the belt-shaped member, making it possible to easily attach the spiral plates by welding. As a result, a separator with high strength can be obtained.

[0014] Furthermore, because a separator with high strength can be obtained, the assembly of the separator and its installation inside the settling tank can be carried out in a factory, thereby shortening the construction period of the high-speed settling device and reducing construction costs.

[0015] The high-speed settling device of the present invention preferably includes a connecting member that connects the belt-shaped members together.

[0016] In this configuration, the strip-shaped members (blade units) can be easily connected to each other via the connecting members, making the assembly of the separator easier, thereby shortening the construction period of the high-speed settling device and reducing construction costs. In addition, in the high-speed settling device of the present invention, it is preferable that one spiral-shaped plate is attached to one strip-shaped member extending from the upper end to the lower end of the cylinder.

[0017] In addition, the high-speed settling device of the present invention may have a plurality of spiral plates attached to each of the belt-shaped members.

[0018] In this configuration, the number of strip-shaped members that need to be connected to each other can be reduced compared to when one spiral-shaped plate is attached to one strip-shaped member, which simplifies the manufacture of the separator.

[0019] In order to solve the above-mentioned problems, the manufacturing method of a high-speed settling device of the present invention is a manufacturing method of a high-speed settling device comprising a bottomed cylindrical settling tank and a separator disposed in the settling tank and having a plurality of plates attached to the outer peripheral surface of the cylinder.

[0020] In the manufacturing method of the high-speed sedimentation device, the cylinder is constructed by connecting multiple strip-shaped members to form a cylindrical shape, and the separator has a structure in which multiple blade units each comprising the strip-shaped member and a spiral-shaped plate attached to the outer surface of the strip-shaped member are connected together to be attached so as to wrap around the outer surface of the cylinder in a spiral shape.

[0021] Furthermore, the manufacturing method for a high-speed sedimentation device further includes a blade unit forming process, which includes a process of fixing the strip-shaped member in a spiral shape to the outer periphery of a cylindrical forming jig, and a process of attaching the spiral-shaped plate to the strip-shaped member.

[0022] The manufacturing method of the high-speed sedimentation device also includes a separator assembly process in which the cylindrical cylinder is assembled by sequentially connecting the strip-shaped members of the multiple blade units formed in the blade unit formation process in the vertical direction, and the separator is assembled so that each of the spiral-shaped plates is attached so as to wind in a spiral shape around the outer peripheral surface of the cylinder.

[0023] In the method for manufacturing a high-speed sedimentation device of the present invention, a blade unit in which a belt-shaped member and a spiral-shaped plate are integrated can be formed using a cylindrical forming jig. During this formation, the belt-shaped member can be fixed to the cylindrical forming jig before the spiral-shaped plate is attached, making it easy to secure the working space required for attachment.

[0024] Then, by forming multiple blade units and then sequentially connecting the strip-shaped members of the multiple blade units in the vertical direction, a cylindrical cylinder can be assembled, and a separator can be assembled in which each spiral-shaped plate is attached so as to wrap around the outer surface of the cylinder in a spiral shape.

[0025] This eliminates the need for the conventional, cumbersome process of attaching spiral plates one by one to a cylinder, simplifying the manufacturing of separators and reducing the construction time and costs of high-speed settling devices.

[0026] Furthermore, in the manufacturing method of the high-speed settling device of the present invention, the separator can be made of metal. That is, since the spiral plate is attached to the belt-shaped member in the blade unit forming step, welding space can be easily secured when welding these metal components, and the spiral plate can be reliably fixed by welding.

[0027] If, as in the past, the spiral plates were attached one by one by welding after forming a cylindrical cylinder, the spiral plates would be too close to each other, making it difficult to ensure sufficient welding space and limiting the welding locations. In contrast, the present invention makes it easy to ensure welding space around the strip-shaped member, allowing the spiral plates to be easily attached by welding. As a result, a separator with high strength can be obtained.

[0028] Furthermore, because a separator with high strength can be obtained, the assembly of the separator and its installation inside the settling tank can be carried out in a factory, thereby shortening the construction period of the high-speed settling device and reducing construction costs.

[0029] In addition, in the manufacturing method of the high-speed sedimentation device of the present invention, it is preferable that the separator is provided with a connecting member that connects the strip-shaped members to each other, and the blade unit forming process includes a connecting member attachment process that attaches the connecting member to the strip-shaped member.

[0030] In this configuration, the blade units can be easily connected via the connecting members attached in the connecting member attachment step of the blade unit formation step, making the assembly of the separator simpler, thereby further shortening the construction period of the high-speed settling device and reducing construction costs. [Effects of the Invention]

[0031] The high-speed settling device and the method for manufacturing the high-speed settling device of the present invention can shorten the construction period and reduce the construction costs. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a schematic diagram showing a high-speed sedimentation device according to one embodiment of the present invention. [Figure 2] 1 is an enlarged front view showing a separator provided in a high-speed settling device according to an embodiment of the present invention. FIG. [Figure 3] 3(a) and 3(b) are diagrams showing a separator provided in a high-speed settling device according to one embodiment of the present invention, in which (a) is a plan view and (b) is a cross-sectional view taken along line IIIb-IIIb in FIG. 3(a). [Figure 4A] 1A and 1B are diagrams showing a blade unit (spiral-shaped plate) that constitutes a separator of a high-speed settling device according to one embodiment of the present invention, where (a) is a plan view and (b) is a front view shown in comparison with a cylinder. [Figure 4B]FIG. 2 is a front view showing a state in which blade units (spiral-shaped plates) constituting a separator of a high-speed settling device according to one embodiment of the present invention are connected in the vertical direction. [Figure 5] 1A and 1B are diagrams showing a blade unit constituting a separator of a high-speed sedimentation device according to one embodiment of the present invention, where (a) is an oblique view and (b) is a partially enlarged cross-sectional view showing the fixing structure between a cylinder member and a spiral-shaped plate. [Figure 6A] 1A and 1B are diagrams showing elements of the cylinder member that constitute the blade unit of a high-speed sedimentation device according to one embodiment of the present invention, where (a) is an expanded view of the belt-shaped member, and (b) is an expanded view of the connecting member. [Figure 6B] FIG. 2 is an exploded view of a cylinder member that constitutes a blade unit of a high-speed sedimentation device according to one embodiment of the present invention. [Figure 6C] FIG. 2 is an enlarged explanatory view showing a cylinder member of a high-speed settling device according to one embodiment of the present invention. [Figure 6D] 6D is an enlarged cross-sectional view taken along line VID-VID in FIG. 6C, showing a cylinder member of a high-speed settling device according to one embodiment of the present invention. FIG. [Figure 6E] 6D is an enlarged cross-sectional view of a portion corresponding to line VID-VID in FIG. 6C, illustrating how the cylinder members of a high-speed settling device according to one embodiment of the present invention are connected to each other. [Figure 7A] 1 is a development view showing a schematic diagram of multiple connected cylinder members of a high-speed settling device according to one embodiment of the present invention. FIG. [Figure 7B] FIG. 1 is a perspective view showing a schematic configuration of a cylinder of a high-speed settling device according to one embodiment of the present invention. [Figure 7C] FIG. 1 is a perspective view showing a schematic configuration of an assembled cylinder of a high-speed settling device according to one embodiment of the present invention. [Figure 8] 8(a) and 8(b) are diagrams showing a cylinder of a high-speed settling device according to one embodiment of the present invention, in which (a) is a plan view and (b) is a cross-sectional view taken along line VIIIb-VIIIb in FIG. 8(a). [Figure 9] 1 is an exploded view of a spiral plate of a high speed settling device according to an embodiment of the present invention. FIG. [Figure 10] 1A and 1B are diagrams showing a cylindrical forming jig for a blade unit that constitutes a separator of a high-speed sedimentation device according to one embodiment of the present invention, where (a) is an oblique view and (b) is an oblique view showing the state in which a cylinder member fixing jig is fixed to the cylindrical forming jig. [Figure 11] This is an oblique view showing a state in which a cylinder member is fixed to a cylinder member fixing jig of a cylinder forming jig for forming a blade unit of a high-speed sedimentation device according to one embodiment of the present invention. [Figure 12] This is an oblique view showing the state when attaching a spiral-shaped plate to a cylinder member fixed to a cylinder member fixing jig in a cylindrical forming jig for forming a blade unit of a high-speed sedimentation device according to one embodiment of the present invention. [Figure 13] This is an explanatory diagram showing a cross section of a spiral-shaped plate attached to a cylinder member fixed to a cylinder member fixing jig when forming a blade unit of a high-speed sedimentation device according to one embodiment of the present invention. [Figure 14] 1 is an enlarged front view showing a separator manufactured by a manufacturing process of a high-speed settling device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description, the up and down directions refer to the vertical direction perpendicular to the surface on which the high-speed settling device is installed.

[0034] Fig. 1 is a diagram showing a schematic diagram of the overall configuration of a high-speed settling device 1. As shown in Fig. 1, the high-speed settling device 1 includes a settling tank 2 and a separator 10 installed in the settling tank 2. The high-speed settling device 1 is a device that efficiently performs solid-liquid separation by rotating the separator 10 in the settling tank 2 in accordance with the ascending speed of the suspended water to be treated.

[0035] As shown in Figure 1, the settling tank 2 has a cylindrical body 3a and a bottom 3b that closes the lower part of the body 3a, giving it a cylindrical shape with a bottom. An inlet pipe 2a, through which the suspended water to be treated is introduced, passes through the body 3a. The inlet pipe 2a extends inside a cylinder 20 (described later) of the separator 10, and has a discharge port 2b at an upper position inside the cylinder 20. A water collecting trough 2f is attached to the top of the body 3a.

[0036] An outlet 2c is attached to the water collection trough 2f for discharging the sedimentation treatment liquid of the suspended water to be treated that has flowed over the overflow weir of the body portion 3a. A bridge portion 4 extending in the radial direction of the body portion 3a is provided at the top of the water collection trough 2f. A drive mechanism 11 for driving and rotating the separator 10 is disposed in the center of the extension direction of the bridge portion 4. The drive mechanism 11 is housed in a storage portion 12 and is driven by the driving force of an electric motor 6 disposed on the side of the storage portion 12.

[0037] As shown in Fig. 1, the drive mechanism 11 rotates a drive shaft cylinder 13 connected to the upper end of the cylinder 20 of the separator 10. The drive shaft cylinder 13 has an upper cylindrical portion 13a whose diameter is smaller than the outer diameter of the cylinder 20, and a tapered cylindrical portion 13b that is continuous with the lower portion of the upper cylindrical portion 13a and tapers downward. The lower end of the tapered cylindrical portion 13b is connected to an upper flange 25 (see Fig. 2) of the cylinder 20, which will be described later.

[0038] The bottom 3b is formed in a funnel shape (approximately V-shaped cross section). A sludge collector 5 is provided at the bottom of the settling tank 2 to scrape together sludge containing settled particles. The sludge collector 5 is equipped with a scraper blade 5a that comes into contact with the upper surface of the bottom 3b and scrapes up the sludge. The scraper blade 5a has the function of scraping the sludge into a recess 5b provided in the center of the bottom 3b. A sludge discharge pipe 5c is connected to the recess 5b.

[0039] The bottom 3b is not limited to being formed in the above-described substantially V-shape, but may be formed in a downward slope from the center toward the outside in the radial direction (a substantially inverted V-shape in cross section). In this case, the scraper blade 5a is made to correspond to the shape of the bottom 3b, and an annular recess or the like to which the sludge discharge pipe 5c is connected is provided on the outer periphery of the bottom 3b, so that the scraper blade 5a has the function of scraping sludge toward the outer periphery of the bottom 3b.

[0040] As shown in Figure 1, the sludge collector 5 is rotated by a drive shaft 8. The drive shaft 8 is disposed on the central axis of the settling tank 2, passes through a separator 10, and is driven by the driving force of an electric motor 7 provided above the storage section 12 at the top of the settling tank 2.

[0041] Fig. 2 shows a front view of the separator 10 installed in the settling tank 2. As shown in Fig. 2, the separator 10 includes a cylindrical cylinder 20 (see also Fig. 1) and a plurality of spiral plates 30 attached so as to wrap around the outer circumferential surface of the cylinder 20 in a spiral shape.

[0042] Here, the term "spiral shape" refers to a shape that traces a locus at an angle in the vertical direction while going around the outer peripheral surface of the cylinder 20 in the circumferential direction, and includes a curved configuration that does not wind around the outer peripheral surface of the cylinder 20. Furthermore, the spiral-shaped strip member 21 (FIGS. 4A(b), 5(a), etc.) described below includes not only one made of a single member in the direction in which the locus extends, but also one made of multiple members connected in the direction in which the locus extends.

[0043] Stainless steel plate is used as the material for the cylinder 20 and the spiral plate 30, which allows for weight reduction and cost reduction. In addition to stainless steel plate, various metal materials such as various steel plates and titanium alloy plates can be used. Furthermore, resin materials such as fiber reinforced plastic (FRP) and polymer materials such as polycarbonate, acrylic, and fluororesin may also be used.

[0044] As shown in FIG. 2, the separator 10 has an appearance in which the separator 10 is covered almost entirely with a plurality of spiral-shaped plates 30 when viewed from the front, and a part of the cylinder 20 is exposed at the top of the separator 10.

[0045] FIG. 3(a) shows a plan view of the separator 10, and FIG. 3(b) shows a cross-sectional view comparing the separator 10 with a spiral-shaped plate (phantom line) 30. 3(a) and 3(b), the separator 10 has a structure in which a plurality of spiral plates 30 extend radially outward from the cylinder 20. The spiral plates 30 are configured as blade units made up of a combination of multiple components, as described below.

[0046] 4A(a) and (b) show a spiral-shaped plate 30 configured as a blade unit 40. Fig. 4A(a) shows a plan view of the spiral-shaped plate 30, and Fig. 4A(b) shows a front view comparing the spiral-shaped plate 30 with a cylinder (phantom line) 20.

[0047] FIG. 4B shows a front view of the process of sequentially connecting blade units 40 in the vertical direction. FIG. 4B illustrates the process of sequentially connecting blade units 40 in the vertical direction in an upside-down position, corresponding to the manufacturing process of separator 10 described below. Note that when separator 10 is installed in settling tank 2, it is rotated 180 degrees from its upside-down position in a direction that causes separator 10 to overturn. The position of separator 10 shown in FIG. 2 is the position at the time of installation. FIG. 5(a) shows a perspective view of a spiral-shaped plate 30 configured as blade unit 40.

[0048] The separator 10 of this embodiment is constructed by connecting (assembling) a plurality of substantially conical blade units 40 shown in FIGS. 4A(a)(b) and 5(a) in the vertical direction of the cylinder 20 using a manufacturing process described below. Specifically, as shown in FIG. 4B, the blade units 40 are sequentially connected in the vertical direction in an upside-down orientation, thereby connecting each cylinder member 21A having a spiral-shaped plate surface and forming the wall portion of the cylinder 20, thereby forming the wall portion of the cylindrical cylinder 20 as shown in FIGS. 1, 2, and 3(a)(b). At the same time, the spiral-shaped plates 30 individually provided on the outer surfaces of the cylinder members 21A are attached so as to spirally wrap around the outer peripheral surface of the formed cylinder 20, thereby assembling the separator 10 with the appearance shown in FIG. 2. Details of the manufacturing process for the separator 10 will be described later.

[0049] Fig. 5(b) is a cross-sectional view illustrating the configuration of the blade unit 40. As shown in Figs. 5(a) and 5(b), the blade unit 40 includes a cylinder member 21A that constitutes the cylinder 20, and a spiral-shaped plate 30 attached to the cylinder member 21A. The cylinder member 21A includes a spiral strip-shaped member 21 that constitutes part of the wall of the cylinder 20, and a strip-shaped connecting member 22 attached to the strip-shaped member 21. The strip-shaped member 21 and the connecting member 22 are disposed at a predetermined distance (the distance forming the radius of the cylinder 20) from the central axis O1, and are disposed so that their plate surfaces are parallel to the central axis O1.

[0050] Figures 6A(a) and 6A(b) show the belt-shaped member 21 and the connecting member 22 that constitute the cylinder member 21A. Figure 6A(a) shows a development of the belt-shaped member 21, and Figure 6A(b) shows a development of the connecting member 22. Note that in Figures 6A(a) and 6A(b) and Figures 6B and 6C, which will be described later, the other end 21e, which will be described later, is shown on the upper side of the paper, and one end 21d, which will be described later, is shown on the lower side of the paper, in accordance with the top-bottom arrangement in the manufacturing process, which will be described later.

[0051] 6A(a), the strip-shaped member 21 is a flat plate that extends linearly when unfolded, and is bent into a spiral shape by a bending machine. The strip-shaped member 21 forms part of the cylindrical body of the cylinder 20, and by connecting multiple blade units 40 in a manufacturing process described below, the cylindrical cylinder 20 shown in FIGS. 1, 2, and 3(a) and 3(b) is formed.

[0052] 6A(a), the strip-shaped member 21 of this embodiment is formed into a long plate by welding three members, namely, short strip-shaped members 21a and 21c and long strip-shaped member 21b, at connecting portions 21f and 21g. Note that the strip-shaped member 21 is not limited to a long plate formed by joining a plurality of members together, and may be formed from a single long plate.

[0053] A plurality of nuts 23 are attached at predetermined intervals to one side edge 21m of the belt-shaped member 21. As shown in Fig. 6D, which will be described later, holes 21j communicating with the nuts 23 are formed in one side edge 21m of the belt-shaped member 21.

[0054] One longitudinal end 21d of the belt-shaped member 21 is cut out at an inclination angle γ inclined relative to the longitudinal direction of the belt-shaped member 21 (see FIGS. 6A and 6C). The inclination angle γ is preferably set to approximately 20 to 60 degrees. More preferably, the inclination angle γ is set to 45 degrees. The other longitudinal end 21e of the belt-shaped member 21 on the opposite side is also cut out at an inclination angle γ (see FIG. 6A) with the same inclination angle γ.

[0055] One end 21d is a portion that is held by an upper flange 25 (described later) (see FIG. 8(b)), and the other end 21e is a portion that is held by a lower flange 26 (described later) (see FIG. 8(b)).

[0056] In Fig. 6A(a), a dashed two-dot line in the widthwise center of the strip-shaped member 21 indicates an attachment point 27 where the base end 31 (see Fig. 5(b)) of the spiral-shaped plate 30 is attached by welding. As shown in Fig. 6A, this attachment point 27 extends from the long strip-shaped member 21b, over the connecting portions 21f and 21g, to the short strip-shaped members 21a and 21c. Note that grooves, marks, etc. may be formed along the attachment point 27 to improve the efficiency of the welding work.

[0057] 6A(b), the connecting member 22 is a flat plate that extends linearly in the unfolded state and is bent into a spiral shape by a bending machine. The connecting member 22 is formed into a long plate by welding three members: short connecting members 22a and 22c and a long connecting member 22b. Note that the connecting member 22 is not limited to a long plate formed by joining multiple members together, and may be formed from a single long plate.

[0058] A plurality of insertion holes 24 are formed at predetermined intervals in the connecting member 22. Each insertion hole 24 is formed corresponding to each nut 23 of the belt-shaped member 21. Each insertion hole functions as an insertion hole for a fixing bolt 28, which will be described later (see FIG. 6E).

[0059] FIG. 6B shows a cylinder member 21A formed by attaching a connecting member 22 to a belt-shaped member 21. FIG. 6C shows an enlarged view of one end 21d of the cylinder member 21A. FIG. 6D shows a cross section of the attachment of the connecting member 22 to the belt-shaped member 21. Furthermore, FIG. 6E shows a cross section of the state when connecting cylinder members 21A to each other. In FIG. 6E, adjacent cylinder members 21A are denoted by the reference numerals 21A-1 and 21A-2.

[0060] 6B and 6, cylinder member 21A is formed by attaching connecting member 22 by welding to the back surface side of other side edge 21n of belt-shaped member 21. In the manufacturing process of cylinder member 21A, belt-shaped member 21 and connecting member 22 are individually bent, and then connecting member 22 is attached to belt-shaped member 21 by welding.

[0061] 6C and 6D, when the connecting member 22 is attached to the belt-shaped member 21, a step 21h that is one step lower is formed between the connecting member 22 and the other side edge 21n of the belt-shaped member 21. Then, one side edge 21m of the cylinder member 21A-2 adjacent to the cylinder member 21A-1 is positioned using this step 21h, as shown in FIG.

[0062] Then, in a manufacturing process described below, when connecting adjacent cylinder members 21A-1 and 21A-2, as shown in Fig. 6E, fixing bolts 28 inserted through insertion holes 24 of connecting member 22 are screwed into nuts 23 of belt-shaped member 21 arranged on stepped portion 21h. Furthermore, although not shown, by sequentially connecting cylinder members 21A-3 to 21A-16, connected body 21B (see Fig. 7A) which is an assembly of cylinder members 21A-1 to 21A-16 is formed.

[0063] 7A to 7C are schematic diagrams sequentially illustrating the formation of a cylinder 20 by rolling up a connected body 21B formed by connecting multiple cylinder members 21A. In other words, FIGS. 7A to 7C are hypothetical diagrams for the future formation of a cylinder structure, and illustrate the future generation of the wall surface of the cylinder 20 by sequentially connecting the cylinder members 21A. Note that in the manufacturing process described below, individual cylinder members 21A are not connected to each other, but here, in order to simply explain the formation of the cylinder 20, a sheet formed by connecting multiple cylinder members 21A is used.

[0064] FIG. 7A shows that a connected body 21B (sheet-shaped) is formed by connecting a plurality of cylinder members 21A. In FIG. 7A, the plurality of cylinder members 21A are denoted by reference numerals 21A-1 to 21A-16 (a total of 16). FIG. 7B shows that a tube is generated as a result of connecting 16 strip-shaped members 21 (cylinder members 21A) in the vertical direction. FIG. 7C shows the generated tube. Note that, in this embodiment, the description has been given using 16 strip-shaped members 21, but the number of strip-shaped members 21 is not limited thereto.

[0065] As shown in Fig. 7A, a sheet-like, generally diamond-shaped connected body 21B is formed by connecting multiple cylinder members 21A-1 to 21A-16 with fixing bolts 28 (not shown). In Fig. 7A, if the four sides of connected body 21B are respectively designated by symbols S1 to S4, the sides that are connected when the connected body 21B is rolled into a three-dimensional cylindrical shape are sides S2 and S4.

[0066] As shown in FIG. 7B, connecting body 21B is rolled up, and edges S2 and S4 that approach each other in the circumferential direction in the rolled state are connected and closed with fixing bolts 28 (not shown). As a result of connecting the rolled up parts, a cylindrical cylinder 20 will be formed in the future (see FIG. 7C).

[0067] 7A is calculated by the formula W=L1 / n, where L1 is the circumferential length of the cylinder and n is the number of spiral plates 30. The total number of cylinder members 21A constituting the connecting body 21B is set appropriately based on the design of the separator 10.

[0068] 8(a) and 8(b) show the final form (post-assembly form) of the flange 20 described above with reference to Fig. 6A to Fig. 7C. Fig. 8(a) shows a plan view of the cylinder 20 in its final form, and Fig. 8(b) shows a longitudinal cross-sectional view of the cylinder 20 in its final form.

[0069] As shown in Figures 8(a) and 8(b), the upper flange 25 is a member that holds one end 21d, which is the upper edge of the cylinder 20. The upper flange 25 reinforces the one end 21d of the cylinder 20 by tightening it from the radial outside. As shown in Figure 8(a), a plurality of bolt holes 25b are formed in the flange portion 25a of the upper flange 25. The upper flange 25 is fixed to the drive shaft cylinder 13 (see Figure 1) of the drive mechanism 11 by bolts (not shown) that are inserted into the bolt holes 25b.

[0070] 8(b), the lower flange 26 is a member that holds the other end 21e of the cylinder 20, which is the lower edge of the cylinder 20. The lower flange 26 reinforces the other end 21e of the cylinder 20.

[0071] As shown in Fig. 8(b), the belt-shaped members 21 and the connecting members 22 are alternately exposed in a spiral shape on the inner surface of the cylinder 20. Note that the heads of the fixing bolts 28 are omitted from Fig. 8(b).

[0072] Next, the spiral-shaped plate 30 will be described with reference to Figures 4A(a)(b), Figures 5(a)(b), and Figure 9. Figure 9 shows a development view of the spiral-shaped plate 30.

[0073] As shown in FIG. 4A(a), the spiral plate 30 has a substantially C-shape in plan view. The angle from the upper end 33 to the lower end 34 of the spiral plate 30 (angle α around the central axis O1 in plan view) is preferably set to approximately 150 to 300 degrees. More preferably, the angle α is set to 180 degrees. The angle of the spiral plate 30 can be appropriately set, for example, within the range of 150 to 300 degrees, depending on the size of the separator 10 (such as the axial length and outer diameter of the cylinder 20).

[0074] As shown in Figure 4A(b), the spiral-shaped plate 30 extends in a spiral shape starting from a portion near the upper flange 25 so that the outer edge 32 protrudes diagonally downward, and is positioned so that a portion of the lower end 34 of the spiral-shaped plate 30 protrudes below the lower flange 26.

[0075] As shown in Fig. 5(b), the spiral-shaped plate 30 is attached by welding at an inclination angle β of approximately 30 degrees to the vertically disposed strip-shaped member 21. As shown in Fig. 9, the spiral-shaped plate 30 is a flat plate that is curved in an unfolded state, and is bent by a bending machine into a spiral shape as shown in Figs. 4A(a) and (b).

[0076] That is, the spiral-shaped plate 30 is bent so as to have an inclination angle β of approximately 30 degrees with respect to the plate surface of the strip-shaped member 21 of the cylinder member 21A. By attaching the spiral-shaped plate 30 to the cylinder member 21A at an inclination angle β of approximately 30 degrees, suspended particles contained in the suspension water to be treated can slide down smoothly along the upper surface of the spiral-shaped plate 30. In this embodiment, one spiral-shaped plate 30 is attached to one cylinder member 21A.

[0077] The number of spiral plates 30 in the separator 10 is determined based on the water surface load (m 3 / m 2 × days) can be calculated using the following formulas (1) and (2). Water area load (m 3 / m 2 × days) = Amount of inflowing suspension water to be treated (m 3 / day) / total area of ​​horizontal projection of spiral plate (m 2 ) ···(1) Total horizontal projection area of ​​the spiral plate (m 2 ) = horizontal projection area of ​​one spiral plate (m 2 ) × number of spiral plates (2)

[0078] Next, the manufacturing process of the separator 10 will be described with reference to Figures 10(a) and 10(b) and Figures 11 to 13. Figures 10(a) and 10(b) show a cylinder forming jig 50. Figure 10(a) shows a perspective view of the cylinder forming jig 50, and Figure 10(b) shows a perspective view of the cylinder forming jig 50 to which a cylinder member fixing jig 55 is attached.

[0079] Fig. 11 shows the state in which cylinder member 21A is fixed to cylinder member fixing jig 55. Fig. 12 shows the state in which spiral-shaped plate 30 is attached to band-shaped member 21 of fixed cylinder member 21A. Fig. 13 shows a partial cross section of the manner in which spiral-shaped plate 30 is attached to band-shaped member 21. Fig. 14 shows the manufactured separator.

[0080] In the manufacturing process of the separator 10 of this embodiment, the blade unit 40 is formed using a cylindrical forming jig 50 shown in Fig. 10(a). In the separator manufacturing process, the blade unit 40 is formed upside down in consideration of ease of welding work (see Fig. 12).

[0081] The manufacturing process of the separator 10 includes a process of forming the blade units 40 and a process of assembling the separator 10. The blade unit forming process is a process of forming a plurality of blade units 40. Note that the blade unit forming process of this embodiment includes a connecting member attaching process. On the other hand, the separator assembling process is a process of assembling the separator 10 by connecting (combining) the plurality of blade units 40 formed in the blade unit forming process.

[0082] As shown in Figure 10(a), the cylinder forming jig 50 has a cylindrical framework formed by vertically spaced apart multiple ring-shaped members 51 and multiple pillar members 52. As shown in Figure 10(b), two spirally extending cylinder member fixing jigs 55 are attached to the outer circumferential surface of the cylinder forming jig 50, one at the front and one at the back.

[0083] The cylinder member fixing jig 55 is a jig for positioning the cylinder member 21A (see Figures 11 and 4A(b)), and is attached so that it fits along the cylinder member 21A. Although two cylinder member fixing jigs 55 are attached to the cylinder forming jig 50, one at the front and one at the back, only one may be provided. When two are attached, one at the front and one at the back, mass productivity of the blade unit 40 is improved.

[0084] In the blade unit forming process, first, in the connecting member attaching process, the connecting member 22 is attached to the other end of the belt-shaped member 21 by welding to form the cylinder member 21A. In this case, in the connecting member attaching process, the same work is repeated to form the required number of cylinder members 21A. Note that in the connecting member attaching process, the belt-shaped member 21 may be first fixed to the cylinder member fixing jig 55 of the cylinder forming jig 50, and then the connecting member 22 may be fixed thereto by welding.

[0085] 11, in the blade unit forming process, the cylinder member 21A is attached by being pressed against the cylinder member fixing jig 55. In this case, a clamping tool 56 is used to position the cylinder member 21A in the cylinder member fixing jig 55. At this time, the cylinder member 21A is arranged so that the other end 21e (see FIG. 12) of the belt-shaped member 21 is positioned at the upper end of the cylinder forming jig 50.

[0086] After the cylinder member 21A is attached to the cylinder member fixing jig 55, as shown in FIG. 12, the base end 31 of the spiral-shaped plate 30 is brought close to the cylinder member 21A, and the spiral-shaped plate 30 is attached to the attachment location 27 (see FIG. 6A) of the strip-shaped member 21 by welding. An example of the attachment method by welding is shown in FIG. 13. In FIG. 13, welding is performed from the lower side (rear side) of the base end 31 of the spiral-shaped plate 30. Note that welding may also be performed from the upper side (front side) of the base end 31, or from both the lower and upper sides.

[0087] In this assembly process, the base end 31 of the spiral-shaped plate 30 is abutted against the attachment point 27 (see FIG. 6A) of the strip-shaped member 21 upside down, so that the base end 31 of the spiral-shaped plate 30 abuts against the strip-shaped member 21 in a wedge-like manner, making it less likely to slip, and the angle of the welded portion is wider, making welding easier. Then, by repeating the same operations described with reference to FIGS. 11 and 12, the required number of blade units 40 (for example, 16 in this embodiment) are individually formed. The required number is not limited to 16.

[0088] Furthermore, since a welding space can be easily secured around the belt-shaped cylinder member 21A during welding, the welding work is easy to perform and the spiral-shaped plate 30 can be reliably fixed to the cylinder member 21A (belt-shaped member 21).

[0089] If, as in the past, the spiral-shaped plates were attached by welding one by one after forming a cylindrical cylinder, the wall of the cylindrical cylinder would get in the way, making it impossible to reach from the outside of the cylinder to the inside of the cylinder, or from the inside of the cylindrical cylinder to the outside of the cylinder.In addition, since the spiral-shaped plates are close to each other, it is not possible to ensure sufficient welding space, and there is a risk that the welding points will be limited.

[0090] In contrast, in this embodiment, the top and bottom of the strip-shaped member 21 are left open during the blade unit formation process, which increases the reach and makes it easy to secure welding space around the strip-shaped member 21, making it possible to easily attach the spiral-shaped plate 30 by welding.

[0091] Next, the plurality of blade units 40 formed in the blade unit forming step are connected in succession in the vertical direction in the separator attaching step, thereby forming the cylinder 20.

[0092] 14 shows a product in which a cylindrical cylinder 20 is assembled by sequentially connecting multiple blade units 40 in the separator mounting process, and each spiral-shaped plate 30 is attached so as to spirally wind around the outer circumferential surface of the cylinder 20. That is, in the separator mounting process, multiple blade units 40 formed upside down in FIG. 12 are sequentially connected in that orientation (see FIG. 4B) to assemble the separator 10.

[0093] In the separator attachment process, when connecting the belt-shaped members 21 to each other in the vertical direction via the connecting members 22 (three sets of blade units 40 are shown in FIG. 4B ), the fixing bolts 28 are inserted from the inside of the blade units 40 through the insertion holes 24 of the connecting members 22 and screwed into the nuts 23 of the belt-shaped members 21. In this case, since the fixing bolts 28 can be inserted from the inside of the blade units 40 and tightened to the nuts 23, the work of connecting the blade units 40 to each other can be easily performed.

[0094] The same process is then repeated multiple times to sequentially connect the blade units 40 in the vertical direction of the cylinder 20. Thereafter, the last blade unit 40 is connected to the first blade unit 40, completing the process of connecting the blade units 40. As a result, as shown in FIG. 14, a cylindrical cylinder 20 is formed, and a separator 10 is assembled in which a predetermined number of spiral-shaped plates 30 are attached to the outer peripheral surface of the cylinder 20.

[0095] Thereafter, the upper flange 25 and the lower flange 26 are attached to the cylinder 20 with respect to the separator 10 in the upside-down state shown in Figure 14. In this case, since the separator 10 is in the upside-down state, the upper flange 25 and the lower flange 26 are also attached upside-down to the cylinder 20. In other words, the upper flange portion 25 is attached to the part that will become the upper edge when the separator 10 is installed in the settling tank 2, and the lower flange portion 26 is attached to the part that will become the lower edge when the separator 10 is installed in the settling tank 2. This completes the final product of the separator 10.

[0096] In this way, in the manufacturing process, separator 10 is manufactured in an upside-down position. Furthermore, when separator 10 is stored in the manufacturing factory after manufacturing, and when it is transported from the manufacturing factory to the construction site, separator 10 is stored and transported in an upside-down position. Then, when separator 10 is to be installed in settling tank 2, separator 10 is rotated 180 degrees from the upside-down position in an inverted direction, so that upper flange 25 is positioned on the upper side, as shown in FIG. 2 . Then, separator 10 is installed in settling tank 2 in this position.

[0097] According to the high-speed settling device 1 of this embodiment described above, multiple sets of blade units 40 each having a spiral-shaped plate 30 attached to a spiral-shaped strip member 21 (cylinder member 21A) are prepared, and each blade unit 40 is sequentially connected in the vertical direction of the cylinder 20, thereby assembling a separator 10 having multiple spiral-shaped plates 30 attached to the outer peripheral surface of the cylindrical cylinder 20.

[0098] This eliminates the need for the conventional complicated process of attaching spiral plates one by one to a cylinder, and simplifies the manufacture of the separator 10. This reduces the construction time and costs of the high-speed settling device 1.

[0099] Furthermore, in the high-speed settling device 1 of this embodiment, the separator 10 can be made of metal. That is, since the spiral-shaped plate 30 is attached to the strip-shaped member 21, welding space can be easily secured when these are made of metal and welded together, and the spiral-shaped plate 30 can be reliably fixed by welding. Therefore, a separator 10 with high strength can be obtained.

[0100] Furthermore, the high-speed settling device 1 of this embodiment provides a separator 10 with high strength, which allows the assembly of the separator 10 and the installation of the separator 10 inside the settling tank 2 to be carried out in a factory. In other words, even in its assembled state, the separator 10 can withstand external forces acting during transportation and installation. If the separator 10 assembled in a factory can be transported to the installation site of the high-speed settling device 1, the construction period for the high-speed settling device 1 can be shortened and the construction costs can be reduced.

[0101] Furthermore, in the high-speed settling device 1 of this embodiment, the belt-shaped members 21 (blade units 40) can be easily connected to each other via the connecting members 22, which makes it easier to assemble the separator 10. Therefore, the construction period for the high-speed settling device 1 can be further shortened, and the construction costs can be further reduced.

[0102] Furthermore, in the manufacturing method of the high-speed settling device 1 of this embodiment, the blade unit forming step can form the blade unit 40 in which the strip-shaped member 21 (cylinder member 21A) and the spiral-shaped plate 30 are integrated using a cylindrical forming jig 50. During this formation, the spiral-shaped plate 30 can be attached after the strip-shaped member 21 (cylinder member 21A) is fixed to the cylindrical forming jig 50, so that the working space required for attachment can be easily secured.

[0103] Then, a predetermined number of blade units 40 are formed, and then the separator attachment process is performed to sequentially connect the strip-shaped members 21 (cylinder members 21A) of the multiple blade units 40 in the vertical direction to form a cylindrical cylinder 20, and a separator 10 is manufactured in which each spiral-shaped plate 30 attached to each strip-shaped member 21 (cylinder member 21A) is arranged side by side on the outer periphery of the cylinder 20.

[0104] This eliminates the need for the conventional complicated process of attaching spiral plates one by one to a cylinder, and simplifies the manufacture of the separator 10. This reduces the construction time and costs of the high-speed settling device 1.

[0105] Furthermore, in the manufacturing method of the high-speed settling device 1 of this embodiment, the separator 10 can be made of metal. That is, since the spiral-shaped plate 30 is attached to the strip-shaped member 21 (cylinder member 21A) in the blade unit forming process, welding space can be easily secured when welding these members made of metal, and the spiral-shaped plate 30 can be reliably fixed by welding. Therefore, a separator with high strength can be obtained.

[0106] Furthermore, since a separator 10 with high strength can be obtained, it is possible to assemble the separator 10 and install the separator 10 inside the settling tank 2 in a factory. Therefore, the construction period of the high-speed settling device 1 can be shortened, and the construction cost can be reduced.

[0107] Furthermore, in the manufacturing method of the high-speed settling device 1 of this embodiment, the blade units 40 can be easily connected via the connecting members 22 attached in the connecting member attachment step in the blade unit formation step, making it easier to assemble the separator 10. Therefore, the construction period for the high-speed settling device 1 can be further shortened, and the construction cost can be further reduced.

[0108] Next, a modified example of the embodiment will be described. In this modified example, the effective width W (the portion corresponding to FIG. 7A) of the belt-shaped member 21 is made larger than that of the above embodiment, thereby increasing the surface area of ​​the belt-shaped member 21, and multiple spiral-shaped plates 30 are attached to one belt-shaped member 21.

[0109] In this modified example, when multiple spiral-shaped plates 30 are attached to one strip-shaped member 21, the effective width W of the strip-shaped member 21 can be calculated by the formula W=L1 / (n / m), where L1 is the circumferential length of the cylinder, n is the total number of spiral-shaped plates 30, and m is the number of spiral-shaped plates 30 to be attached to one strip-shaped member 21.

[0110] In the modified high-speed sedimentation device 1, the number of connected strip-shaped members 21 can be reduced compared to a device in which one spiral-shaped plate 30 is attached to one strip-shaped member 21, making it easier to manufacture the separator 10.

[0111] When the separator 10 is made of metal, the number (m) of spiral-shaped plates 30 that can be attached to one strip-shaped member 21 can be set appropriately within a range that ensures welding space for each spiral-shaped plate 30.

[0112] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate within the scope of the invention. For example, in the above embodiment, the separator 10 is made of metal, but this is not limited to this, and the separator 10 can also be made of fiber reinforced plastic (FRP) or the like as long as it meets the strength required for the separator 10.

[0113] Furthermore, in the above embodiment, a plate-shaped member is used as the connecting member 22, but this is not limited to this, and various shapes can be used as long as they can connect the strip-shaped members 21 together.

[0114] Furthermore, in the above embodiment and modified examples, a configuration in which one spiral-shaped plate 30 is attached to one strip-shaped member 21 and a configuration in which multiple (m) spiral-shaped plates 30 are attached to one strip-shaped member 21 are described, but this is not limited to this, and the cylinder 20 may be formed by mixing both of these.

[0115] Furthermore, spiral plates 30 having different shapes and specifications may be formed and used as part of the separator 10.

[0116] Furthermore, in the above embodiment and modified example, a high-speed settling device 1 equipped with a cylindrical settling tank 2 with a bottom has been described, but this is not limited to this, and the present invention can also be suitably applied to a device equipped with a settling tank of a shape other than cylindrical.

[0117] In the above embodiment, the belt-shaped member 21 is formed by connecting three members, namely, the short belt-shaped members 21a and 21c and the long belt-shaped member 21b. However, this is not limited to this, and the belt-shaped member 21 may be formed by connecting four or more divided arc-shaped (curved) members to form a spiral shape. Similarly, the connecting member 22 may be formed by connecting four or more divided members to form a spiral shape. Furthermore, the spiral-shaped plate 30 may also be formed by connecting a plurality of divided plates to form a spiral shape. [Explanation of symbols]

[0118] 1. High-speed sedimentation device 2 Settling tank 10 Separator 20 cylinders 21 Belt-shaped member 22 Connecting member 30 Spiral Plate 40 Blade Unit

Claims

1. a cylindrical settling tank with a bottom; and a separator disposed in the settling tank and having a plurality of plates attached to an outer peripheral surface of a cylinder; The cylinder is formed by connecting a plurality of strip-shaped members to form a cylindrical shape, the separator has a structure in which a plurality of blade units each including the strip-shaped member and a spiral-shaped plate attached to the outer surface of the strip-shaped member are connected together, and the spiral-shaped plates are attached so as to spirally wind around the outer peripheral surface of the cylinder; the cylinder is configured by sequentially connecting the belt-shaped members of the blade units in a vertical direction, the separator has a structure in which each of the spiral plates is attached to the cylinder so as to spirally wind around the outer circumferential surface of the cylinder, the strip-shaped member extends from the upper end to the lower end of the cylinder, A high-speed settling device, characterized in that each of the spiral-shaped plates consists of a single flat plate extending so as to wind around the outer circumferential surface of the cylinder in a spiral shape.

2. 2. The high-speed sedimentation device according to claim 1, further comprising a connecting member for connecting the belt-shaped members to each other.

3. A high-speed sedimentation device as described in claim 1 or claim 2, characterized in that one spiral-shaped plate is attached to one strip-shaped member extending from the upper end to the lower end of the cylinder.

4. 3. The high-speed sedimentation device according to claim 1, wherein a plurality of spiral plates are attached to each of the belt-shaped members.

5. A method for manufacturing a high-speed settling device including a cylindrical settling tank with a bottom and a separator disposed in the settling tank and having a plurality of plates attached to an outer peripheral surface of a cylinder, the method comprising: The cylinder is formed by connecting a plurality of strip-shaped members to form a cylindrical shape, the separator has a structure in which a plurality of blade units each including the strip-shaped member and a spiral-shaped plate attached to the outer surface of the strip-shaped member are connected together, and the spiral-shaped plates are attached so as to spirally wind around the outer peripheral surface of the cylinder; a blade unit forming step including a step of fixing the belt-shaped member in a spiral shape to an outer periphery of a cylindrical forming jig, and a step of attaching the spiral-shaped plate to the belt-shaped member; a separator assembly process for assembling the cylindrical cylinder by sequentially connecting the strip-shaped members of the plurality of blade units formed in the blade unit forming process in the vertical direction, and for assembling the separator in which each of the spiral-shaped plates is attached so as to wind in a spiral shape around the outer peripheral surface of the cylinder.

6. a connecting member that connects the belt-shaped members together, 6. The method for manufacturing a high-speed sedimentation device according to claim 5, wherein the blade unit forming step includes a connecting member attaching step of attaching the connecting member to the belt-shaped member.

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