JP2007185625A - Chain for sludge scraping apparatus and sludge scraping apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chain which is used in a sludge scraping apparatus to be arranged in a sedimentation basin, is made lightweight, has high corrosion resistance and hardly lengthens and the durability of which is improved. <P>SOLUTION: Each of chain rings which are connected to each other to constitute the chain is composed of metal-made reinforcement piece 40 excellent in tensile strength and a synthetic resin-made wrapping member with which the whole of the reinforcement piece 40 is covered and which is excellent in corrosion resistance. The wrapping member is composed of an outside chain ring piece 60 and an inside chain ring piece 50. The chain ring is formed by inserting the reinforcement piece 40 into the inside 65 of a peripheral wall 63 of the outside chain ring piece 60 and fitting the inside chain ring piece 50 to the inserted reinforcement piece from its outside to integrate them into one body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a chain for a sludge squeezing device, which is installed in a sedimentation basin such as a sewage treatment facility, and a sludge squeezing device.

  The sewage that has flowed into the sewage treatment facility is generally sent to the first sedimentation basin after the sand and trash are removed in the sedimentation basin, etc., and then passed through the reaction tank, final sedimentation basin, etc. After water purification treatment such as decomposition and removal, it is sterilized and sterilized before being discharged into rivers.

  In each of the first and final sedimentation basins of this sewage treatment facility, solids settle and sludge is produced at the bottom of the pond. Therefore, a sludge collecting device is provided to collect and remove sludge by a hopper provided on one of the bottoms. Things have been done. As such a sludge scraping device, devices of a rotary type, a meda type, a siphon type and the like are known, but conventionally, a chain flight type sludge scraping device has been widely used (see Patent Document 1).

FIG. 8 is a side view showing a schematic configuration of this conventional sludge scraping device 110.
As shown in the figure, this sludge scraping device 110 includes a drive sprocket 111 that is driven to rotate by a drive means (not shown), a plurality (three in the figure) of rotatable sprockets 112, and a span between them. Two endless chains 113 that are circulated and driven are provided on the front side and the back side of the figure, and plate-like flights 114 are hung on the outer periphery of the pair of chains 113 at predetermined intervals in the longitudinal direction. Passed and fixed. The sludge scraping device 110 synchronously drives each drive sprocket 111 to circulate and move the chain 113, moves the flight 114 in the direction of the arrow in the figure, slides the bottom of the sedimentation basin, and moves the precipitated sludge to the arrow. The hopper (not shown) provided in the direction is scraped.

  In the sludge scraping device 110 having such a configuration, the chain 113 has a length of several tens of meters depending on the length of the settling basin to be installed, and is driven while supporting a plurality of flights 114 that scrape sludge. Therefore, a large tension is applied to the chain 113. For this reason, a chain 113 made of a metal such as cast iron or stainless steel, which has a high tensile strength and is difficult to extend, has been conventionally used.

  However, the metal chain 113 has low corrosion resistance in water, and particularly when the chlorine ion concentration is high, even the stainless steel chain 113 is easily corroded, and the durability of the chain 113 may be reduced. is there. In addition, since the weight is large, there is a problem that installation takes time and a large amount of power is required for driving.

  In order to cope with such problems, it has been proposed to form a chain with a synthetic resin, and in recent years, such a chain has been adopted mainly in a sludge scraping device used in a severe corrosive environment ( Patent Document 2).

  Synthetic resin chains have the advantage of being able to reduce installation effort and driving power because they are superior in corrosion resistance and are lighter in weight than the metal chains described above. However, synthetic resin has a lower tensile strength than metal, so the chain is likely to be plastically deformed and may gradually grow with the tension during driving. Especially when the temperature of treated water is high or the synthetic resin is easy to absorb water In such a case, there is a possibility that a large elongation may occur depending on the use environment.

In order to eliminate these disadvantages, a chain is known in which a steel reinforcing plate is incorporated into a part of a synthetic resin chain, thereby suppressing the increase in weight and improving the strength to prevent the elongation. (See Patent Document 3).
However, this conventional chain is not intended for use in a harsh environment such as a sedimentation basin, and has a structure in which a part of the reinforcing plate is exposed to the outside. It is easy to do and the durability of the chain may be reduced.

JP 2002-273105 A Japanese Patent Laid-Open No. Sho 61-238307 JP-A-10-184817

  The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to make a chain used in a sludge scraping device installed in a sedimentation basin lightweight, highly corrosion-resistant and difficult to stretch, and its durability. Is to reduce the installation effort and drive power.

The invention of claim 1 is a chain in which a plurality of chain links used in a sludge scraping device installed in a settling basin are connected in an endless manner, and each chain link is reinforced to reinforce the chain link. It is characterized by comprising a piece and an outer packaging member made of synthetic resin that covers the entire reinforcing piece.
According to a second aspect of the present invention, in the sludge scraping device chain according to the first aspect, the outer packet member includes outer and inner chain link pieces integrated with the reinforcing piece interposed therebetween. To do.
According to a third aspect of the present invention, in the sludge scraping device chain according to the second aspect, the outer and inner chain link pieces are fitted and integrated with each other.
According to a fourth aspect of the present invention, in the sludge scraping device chain according to the second or third aspect, the outer and inner chain link pieces have connecting means for integrally connecting each other.
According to a fifth aspect of the present invention, in the sludge scraping device chain according to the fourth aspect, the connecting means includes a protrusion provided on one of the outer or inner chain link pieces and the other of the outer or inner chain link pieces. And a hole that fits into the protrusion provided on the reinforcing piece.
A sixth aspect of the present invention is the sludge scraping device chain according to any one of the second to fourth aspects, wherein the chain link piece and the reinforcing piece are respectively cylindrical barrel portions that are fitted to one end side thereof. It is characterized by having.
A seventh aspect of the present invention is the sludge scraper chain according to any one of the first to sixth aspects, wherein the reinforcing piece is made of metal, ceramic, or a synthetic resin material having higher tensile strength than the outer packet member. It is characterized by.
The invention of claim 8 is characterized in that in the sludge scraping device chain according to any one of claims 1 to 7, a synthetic resin mounting portion for mounting a sludge scraping member to the chain link is provided. To do.
The invention of claim 9 is a sludge scraping device installed in a sedimentation basin, characterized in that the sludge scraping device chain according to any one of claims 1 to 8 is provided.

  According to the present invention, the chain link constituting the chain for the sludge scraping device is composed of a reinforcing piece made of metal or the like for reinforcement and a synthetic resin outer covering member covering the entire reinforcing piece. It is lighter than metal chains and can improve corrosion resistance. At the same time, it can improve tensile strength compared to synthetic resin chains. Accordingly, it is possible to improve the durability of the sludge scraping device and the chain by suppressing the corrosion and elongation of the chain, and to reduce the installation labor and the driving power.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the present embodiment, similarly to the conventional sludge scraping apparatus 110, a chain flight type sludge scraping apparatus installed in a sedimentation basin (first or final sedimentation basin, etc.) of a sewage treatment facility will be described as an example.

FIG. 1 is a side view showing a main part of a sedimentation basin 1 in which a sludge scraping device 10 is installed.
A sedimentation basin 1 according to the present embodiment is a sedimentation basin 1 in which raw water such as sewage containing suspended solids flows through a water channel 2 having a substantially rectangular shape in plan view, and sediments them to remove them as sludge. In addition, the raw water inlet 4 provided in the upstream end wall 3, the hopper 5 for accommodating sludge provided in the bottom of the upstream end of the water channel 2, and the upper provided in the downstream end wall A clear water outlet (not shown) and a sludge scraping device 10 for scraping sludge to the hopper 5 are provided.

FIG. 2 is a front view of the sludge scraping device 10 as seen from the direction of arrow K in FIG.
As shown in FIGS. 1 and 2, the sludge scraping device 10 has a pair of upper and lower bearings 11 and 12 provided on both side walls 6 above the hopper 5, and both ends of the upper and lower bearings 11 and 12 are freely rotatable. The upper and lower rotary shafts 13 and 14 supported, upper and lower sprockets 15 and 16 fixed to both end portions of the rotary shafts 13 and 14, and both side walls 6 near the bottom on the downstream end side of the sedimentation basin 1 And a guide sprocket (not shown) arranged.

  In addition, two endless chains 30 are spanned between the sprockets 15 and 16 and the guide sprocket, and are substantially parallel to each other, with their lower portions being substantially parallel to the bottom of the settling basin 1. Has been passed. Between the two chains 30, a plurality of long plate-like flights 17, which are sludge scraping members, are spanned and fixed at predetermined intervals in the longitudinal direction of the chains 30 so as to be orthogonal to each chain 30. ing.

  Further, a rotary drive device 18, for example, a motor 18 with a speed reduction mechanism is provided on the upper wall portion 7 of the sedimentation basin 1, and a drive sprocket 20 is fixed to the rotary shaft 19. A drive chain 22 is spanned between the drive sprocket 20 and a driven sprocket 21 fixed to the upper rotary shaft 13, and the rotational force of the motor 18 is used to drive the drive sprocket 20, the drive chain 22 and the driven sprocket. This is transmitted to the upper rotary shaft 13 via 21.

  By this rotational force, the sludge scraping device 10 rotates the two upper sprockets 15 fixed to the upper rotating shaft 13, and the two chains 30 meshing with them are moved in the direction in which the raw water flows on the water surface side of the sedimentation site 1. In the same direction, and in the direction opposite to the direction in which the raw water flows on the bottom side, each circulates at the same speed. At that time, the flight 17 fixed between the chains 30 is slid along the bottom of the sedimentation site 1 and the sludge deposited on the bottom is scraped toward the hopper 5.

  The sedimentation basin 1 is configured as described above. The raw water is supplied from the inlet 4 to the water channel 2, the solid matter floating while flowing through the water channel 2 is settled and removed from the raw water, and the downstream outlet is used. The supernatant water is discharged and sent to the next process. At the same time, the sludge deposited on the bottom is scraped by the sludge scraping device 10 and accommodated in the hopper 5, collected by a sludge extraction device (not shown), and transported to a sludge treatment device or the like.

FIG. 3 is an enlarged view of the chain 30 used in the sludge scraping device 10, FIG. 3A is a plan view, and FIG. 3B is a side view.
As illustrated, the chain 30 includes a chain link 31 and a substantially cylindrical pin 32 that is a connecting member between the ends of each chain link 31.

  The chain link 31 includes a pair of link plates 33 arranged in parallel with each other and a cylindrical barrel portion 34 fixed between the inner sides of one end of each link plate 33. As shown in FIG. 3A, each link plate 33 extends from both ends in the axial direction of the barrel portion 34 toward the same direction in the radial direction with a slight gap, bent in the middle, and substantially parallel to each other. It is formed in a letter-like shape in plan view. Further, a substantially circular connecting hole (barrel hole) 35 communicates with the inner peripheral portion of the barrel portion 34 at an end portion on the barrel portion 34 side, and an axial direction is parallel to the barrel hole 35 at the other end portion. Thus, the substantially circular connecting holes 36 are provided so as to be slightly larger in diameter than the pins 32, respectively. Further, the interval between the inner surfaces of the parallel parts is wider than the width of the end part on the barrel part 34 side so that the end part on the barrel part 34 side can be inserted between the parallel parts on the connection hole 36 side.

  The chain links 31 are connected to each other by inserting the end portion on the barrel 34 side between the link plates 33 of the other chain links 31 and aligning the positions of the barrel hole 35 and the connecting hole 36, and then connecting the pin 32 to one of the links. This is done by inserting from the hole 36 through the barrel hole 35 to the other connecting hole 36 and gently fitting the pin 32 to prevent the pin 32 from coming off with a retaining member (not shown) such as a split pin. In this way, the chain 30 is formed by connecting end portions of the plurality of chain links 31 endlessly via the pins 32.

  The chain link 31 is provided with a flight attachment portion 37 for attaching the flights 17 at predetermined intervals. As shown in FIG. 3, the flight attachment portion 37 is provided along the link plates 33, and has a plate-like reinforcing portion 38 that gradually decreases upward, and the chain link 31 from one end side of the reinforcing portion 38. A plate-like attachment portion 39 that extends outward in the width direction and gradually decreases upward is formed in a substantially L shape in plan view, and the attachment surface 39A of the attachment portion 39 is the longitudinal direction of the chain link 31. It is provided so as to be orthogonal to. In the sludge scraping device 10, as shown by a one-dot chain line in FIG. It is fixed with bolts 24 and nuts 25.

  Here, in the present embodiment, the chain link 31 and the pin 32 and other parts of the chain 30 are formed of a synthetic resin having excellent corrosion resistance and the like, and the tensile strength is reduced in order to suppress the elongation due to the tension when sludge is gathered. A reinforcing piece made of an excellent metal or a ceramic such as silicon nitride is provided inside the chain link 31. That is, the chain link 31 is composed of a reinforcing piece for reinforcement and an outer packaging member made of synthetic resin that covers the entire reinforcing piece, and prevents the reinforcing piece from being corroded without exposing the reinforcing piece to the outside. .

  This reinforcing piece is made of a high-strength metal material, for example, stainless steel represented by SUS304 (JIS standard), and is provided between them so as to maintain the distance between the pins 32 at both ends of the chain link 31. It has been. The outer packaging member is made of a plastic excellent in corrosion resistance, wear resistance, durability, or the like, for example, engineering plastic such as acrylic resin or fluorine resin. The chain link 31 is formed by molding such a synthetic resin by heating and melting. That is, after a reinforcing piece having a predetermined shape is arranged at a predetermined position in the gap in the mold, the molten resin is injected into the gap and integrated. In addition to molding, as will be described below, a plurality of divided outer packaging members are assembled and formed by interposing a reinforcing piece inside.

4A and 4B are schematic views showing a part of the constituent members of the chain link 31 used for assembly formation. FIG. 4A is a plan view corresponding to FIG. 3A and FIG. 4B is a side view seen from the direction of arrow X in FIG. is there.
Here, the member which comprises one link plate 33 and the barrel part 34 part is shown.

  As shown in the drawing, this portion includes a reinforcing piece 40, an inner chain link piece 50 that is an outer packet member that houses the reinforcing piece 40 from the inside and the outside and constitutes the surface of the chain link 31, and the outer chain link. It consists of a piece 60. Therefore, the inner chain link piece 50 and the outer chain link piece 60 are fitted and integrated with each other to form one link plate 33 and the barrel portion 34 of the chain link 31, and the reinforcing pieces are formed inside them. It is formed in a shape that creates a space corresponding to the shape of 40.

  The outer chain link piece 60 is a member that constitutes the outer portion in the width direction of the chain link 31 and the inner peripheral portion of the barrel portion 34, and is connected to the connecting hole 36 of the link plate 33 on one end side in the longitudinal direction according to its shape. A corresponding circular hole 61 is provided, and a cylindrical portion 62 corresponding to the barrel portion 34 is provided on the other end side. The hole 61 is formed in the same shape as the connection hole 36 to constitute the connection hole 36 after assembly, and the inner diameter portion of the cylindrical portion 62 is formed in the same shape as the barrel hole 35 in order to form the barrel hole 35. Yes. Further, the outer chain link piece 60 is formed with a peripheral wall 63 and an annular wall portion 64 that protrude in the same direction as the cylindrical portion 62 along the edge portion and the circumferential portion of the hole 61, respectively. The reinforcing piece 40 and the inner chain link piece 50 are accommodated in the inner side 65 partitioned by Further, between the hole 61 and the cylindrical portion 62, two columnar protrusions which are means for integrally connecting the outer chain link piece 60, the inner chain link piece 50, and the reinforcing piece 40 to each other. 66 is formed to protrude in the same direction as the peripheral wall 63 and the same length.

  The reinforcing piece 40 is formed in a shape that can be accommodated in the inner side 65 of the outer chain link piece 60, and similarly to the outer chain link piece 60, a circular hole 41 corresponding to the connecting hole 36 is provided on one end side. A cylindrical portion 42 corresponding to the barrel portion 34 is provided on the end side. The hole 41 is formed to have an inner diameter substantially the same as the outer diameter so as to be fitted to the outer periphery of the annular wall portion 64 of the outer chain link piece 60, and the cylindrical portion 42 is a cylindrical shape of the outer chain link piece 60. The inner diameter of the portion 62 is substantially the same as the outer diameter of the portion 62. Between the hole 41 and the cylindrical portion 42, two holes 43 into which the protrusions 66 of the outer chain link piece 60 are fitted are provided. The reinforcing piece 40 having such a shape is formed, for example, by punching and drawing the outer shape including the holes 41 and 43 and the cylindrical portion 42 from a metal plate material of about 1 mm with a die. . Therefore, in this case, it is preferable to use a material that is easily punched and drawn as the metal material.

  The inner chain link piece 50 is a member constituting the inner portion in the width direction of the chain link 31 and the outer peripheral portion of the barrel portion 34. According to the shape of the inner chain link piece 50, on the one end side in the longitudinal direction, similar to the outer chain link piece 60. A circular hole 51 corresponding to the connection hole 36 of the link plate 33 is provided, and a cylindrical part 52 corresponding to the barrel part 34 is provided on the other end side. Since this cylindrical part 52 comprises the outer periphery of the barrel part 34, it is substantially the same as the outer diameter so that it may fit in the outer diameter same as the outer diameter, and it may fit in the outer periphery of the cylindrical part 42 of the reinforcement piece 40. They are formed with the same inner diameter. Further, like the reinforcing piece 40, it is formed in a shape that can be accommodated in the inner side 65 of the outer chain link piece 60, and the hole 51 is fitted to the outer periphery of the annular wall portion 64 of the outer chain link piece 60. Two holes 53 are formed between the hole 51 and the cylindrical portion 52 and into which the protrusions 66 of the outer chain link piece 60 are fitted.

  Each piece 40, 50, 60 has each shape as described above, and one link plate 33 and the barrel portion 34 of the chain link 31 are formed by inserting the reinforcing piece 40 into the inner side 65 of the outer chain link piece 60. The inner chain link piece 50 is fitted and integrated from above, and the inner reinforcing piece 40 is bonded to each other with an adhesive or the like so that it does not come into contact with the raw water flowing through the sediment 1.

5 is a cross-sectional view of each part after assembly, FIG. 5A is a view taken along the arrow GG in FIG. 4A, FIG. 5B is a view taken along the arrow FF in FIG. 4A, and FIG. FIG.
In the link plate 33, as shown in FIG. 5A, the reinforcing piece 40 and the inner chain link piece 50 on the outer side thereof are fitted inside the peripheral wall 63 of the outer chain link piece 60. It is sandwiched between the link piece 60 and the inner chain link piece 50 so as not to be exposed to the outside. Further, the protrusion 66 of the outer chain link piece 60 is inserted through the hole 43 of the reinforcing piece 40 to the hole 53 of the inner chain link piece 50 and is engaged therewith. Other portions of the link plate 33 are formed in the same manner except for the protrusions 66. However, in the connection hole 36, as shown in FIG. 5B, the annular wall portion 64 of the outer chain link piece 60 is connected to the reinforcing piece 40. It is inserted through the hole 41 to the hole 51 of the inner chain link piece 50 and is fitted.

  On the other hand, in the barrel portion 34, as shown in FIG. 5C, the cylindrical portion 62 of the outer chain link piece 60 is fitted to the inner periphery of the cylindrical portion 42 of the reinforcing piece 40 to form the barrel hole 35. The cylindrical portion 52 of the inner chain link piece 50 is fitted to the outer periphery of the barrel portion 34 to constitute the outer periphery of the barrel portion 34. In addition, the cylindrical portions 42, 52, and 62 are combined, and the tip of the cylindrical portion 62 of the outer chain link piece 60 is axially outside by a predetermined length from the tip of the cylindrical portion 42 of the reinforcing piece 40. In addition, the tip of the cylindrical portion 52 of the inner chain link piece 50 is formed so as to be positioned on the inner side in the axial direction by a predetermined length from the tip of the cylindrical portion 42 of the reinforcing piece 40.

The chain link 31 is formed by attaching the other link plate 33 separately assembled to the other end side of the barrel portion 34 of the one link plate 33 formed as described above.
6A and 6B are schematic views of members constituting the other link plate 33. FIG. 6A is a plan view corresponding to FIG. 3A, and FIG. 6B is a side view seen from the direction of arrow Y in FIG.

  As shown in the figure, the other link plate 33 accommodates the reinforcing piece 70 and the inner chain link piece 80, which is an outer packaging member that forms the surface of the chain link 31, with the reinforcing piece 70 sandwiched from the inside and outside. And the outer chain link piece 90, which are formed in substantially the same manner as the corresponding pieces 40, 50, 60 described above, and thus the description thereof is omitted. However, each piece 70, 80, 90 does not have a cylindrical part constituting the barrel part 34, and circular holes 72, 82, 92 are formed in the part. Here, the inner diameter of the hole 92 of the outer chain link piece 90 is formed substantially the same as the outer diameter of the cylindrical portion 62 of the one outer chain link piece 60 of FIG. Is substantially the same as the outer diameter of the cylindrical portion 42 of one reinforcing piece 40, and the inner diameter of the hole 82 of the inner chain link piece 80 is the same as the outer diameter of the cylindrical portion 52 of one inner chain link piece 50. They are formed substantially the same.

FIG. 7 is a cross-sectional view in the width direction around the barrel portion 34 of the chain link 31 after assembly.
When the chain link 31 is assembled, as shown, the tip of the cylindrical portion 62 of one outer chain link piece 60 in FIG. 4 fits into the hole 92 of the other outer chain link piece 90 in FIG. Further, the tip of the cylindrical portion 42 of one reinforcing piece 40 is fitted into the hole 72 of the other reinforcing piece 70, and the tip of the cylindrical portion 52 of one inner chain link piece 50 is fitted to the other inner chain link piece 80. It fits in the hole 82. As a result, both the reinforcing pieces 40 and 70 are connected to each other, and all the outer surfaces are covered with the respective pieces 50, 60, 80 and 90 made of synthetic resin by bonding the connecting portions to each other with an adhesive or the like. It is not exposed to the outside.

  The flight attachment portions 37 (see FIG. 3) provided on the chain link 31 at regular intervals are made of only synthetic resin, and are integrally formed on the side surfaces of the peripheral walls 63 and 93 of the outer chain link pieces 60 and 90, for example. Provided on the plate 33. Further, the pin 32 which is a connecting member of the chain link 31 is also covered with a reinforcing piece sandwiched between synthetic resin outer covering members in the same manner as the chain link 31 in order to improve the durability against shear deformation and the like. It may be provided at a position not exposed to the outside.

  As described above, in the chain 30 for the sludge scraping device 10 according to the present embodiment, the surface of the chain link 31 is formed by the synthetic resin outer packaging member (each chain link piece 50, 60, 80, 90). Similarly to the resin chain, the corrosion resistance can be improved as compared with the conventional metal chain, and the chain 30 can be reduced in weight, so that the installation labor and driving power can be reduced.

  In addition, since the metal reinforcing pieces 40 and 70 are provided at positions that are covered with the outer cover member of the chain link 31 and are not exposed to the outside, the tensile strength is higher than that of the chain made of only synthetic resin while preventing the corrosion. be able to. Therefore, the elongation of the chain 30 can be suppressed, and the durability of the sludge scraping device 10 and the chain 30 can be improved.

  Further, the chain link 31 can be formed by a simple operation of fitting the chain link pieces 50, 60, 80, 90 to each other with the reinforcing pieces 40, 70 interposed therein, which increases the manufacturing cost. Can be suppressed. Furthermore, since each piece 40, 50, 60, 70, 80, 90 can be firmly connected through the projections 66, 96 and the holes 43, 53, 73, 83 etc. fitted to them, they are disassembled. Can also be prevented.

  The reinforcing pieces 40 and 70 are preferably as thin or small as possible in order to make the chain 30 lighter. Therefore, the reinforcing piece may be provided only in the link plate 33 without being provided in the barrel portion 34, and the shape of the reinforcing piece is, for example, such that an annular member such as a wire is included inside the holes 35 and 36 at both ends. It may be arranged in the link plate 33.

  In order to prevent corrosion of the reinforcing pieces 40 and 70 more reliably, it is preferable to fill a gap between them and the outer packaging member with a sealing material excellent in water resistance, adhesiveness, etc. such as epoxy resin. This reliably prevents the reinforcing pieces 40 and 70 from coming into contact with raw water or the like. In this case, in consideration of easiness of molding and assembly, the peripheral walls 63, 93 of the outer chain link pieces 60, 90 are provided only partially, or the reinforcing pieces 40, 70 are not provided at all. The chain link pieces 50, 60, 80, 90 are sandwiched, filled with the sealing material, and the gaps and the exposed portions of the reinforcing pieces 40, 70 are sealed and bonded to prevent corrosion or decomposition. May be.

  However, in order to prevent the occurrence of defects such as disassembly and cracks of the chain link 31 more reliably, the pieces 50, 60, 80, 90 are made into a fitting structure as described above and firmly fitted to each other. It is more preferable to bond and seal. In addition, a through hole may be formed in them and screwed with bolts and nuts, or the like, and tightening may be performed more firmly with a fastening member. In this case, each fastening member is preferably formed of a synthetic resin having the same corrosion resistance as that of the outer packaging member. In order to prevent raw water from entering the chain link 31, gaps around the fastening member, etc. It is more preferable to seal a portion that may communicate with the inside of the inside with the sealing material or the like.

  Here, in the present embodiment, the reinforcing pieces 40 and 70 are made of metal. However, in order to reduce the weight and the like, the reinforcing pieces 40 and 70 are made of a material other than metal such as synthetic resin having higher tensile strength than the synthetic resin of the outer packaging member. Also good. Examples of such materials include polyamide (including para-aramid), polyacetal, polyester, polyphenylene sulfide, phenol resin, or fiber reinforcement obtained by adding fibers such as glass fiber, carbon fiber, and aramid fiber to these resins. Plastic (FRP) or the like can be used. Among these, it is more preferable to use a fiber reinforced plastic having a small elongation when a tensile stress is applied, particularly a fiber reinforced plastic made of polyamide, polyacetal, or polyester from the viewpoint of preventing deformation of the chain 30. The high tensile strength here means that the elongation in ASTM (American Society for Testing and Materials) test method D638 (corresponding to ISO 527-1) is small. It is more preferable to use a synthetic resin having a result of 2% or less in this test method. This is because the sludge scraping apparatus 10 generally performs adjustment when the chain 30 is extended by 2% or more, and therefore, it is desirable to suppress the elongation of the chain 30 below that.

  The material of the outer packaging member is preferably a material excellent not only in corrosion resistance but also in weather resistance, water resistance, wear resistance, etc. In addition to the above acrylic resin and fluororesin, for example, acrylic urethane resin , Acrylonitrile / styrene copolymer, acrylonitrile butadiene styrene, polycarbonate, polyether ether ketone resin, vinylidene fluoride, polyvinyl chloride, polysulfone, polyethersulfone, polyamideimide, polyetherimide, polyimide, chlorinated polyethylene, etc. An acrylonitrile / styrene copolymer, acrylonitrile butadiene styrene, polyvinyl chloride or the like to which the above modifier is added can be used. Among them, the use of acrylic resin, fluororesin, acrylonitrile / styrene copolymer, acrylonitrile butadiene styrene, polyvinyl chloride to which acrylic resin, fluororesin, or chlorinated polyethylene is added, is excellent in weather resistance in addition to corrosion resistance. It is more preferable from the viewpoint of prevention and improvement of durability. Or what added the aramid resin made into chopped fiber to these synthetic resins is preferable from a viewpoint of improving abrasion resistance more.

  In this embodiment, the chain flight type sludge scraping device 10 has been described as an example. However, the chain 30 is used for other types of sludge scraping devices using a chain such as a meda type or a siphon type. You can also. The structure of the chain link 31 can also be used for a chain having a different shape such as a chain having cylindrical members at both ends of the chain link. It can also be used for other chains that have a fear, for example, the drive chain 22 (see FIGS. 1 and 2) of the sludge scraping device 10.

It is a side view which shows the principal part of the sedimentation basin in which the sludge scraping apparatus was installed. It is a front view of the sludge scraping apparatus seen from the arrow K direction of FIG. It is the top view (A) which expands and shows a part of chain used for a sludge scraping apparatus, and a side view (B). It is a schematic diagram which shows a part of structural member of the chain link used for assembly formation. It is sectional drawing of each part of the chain link after an assembly. It is a schematic diagram of the member which comprises the other link plate of a chain link. It is sectional drawing of the width direction around the barrel part of the chain link after an assembly. It is a side view which shows schematic structure of the conventional sludge scraping apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sedimentation basin, 2 ... Water channel, 3 ... End wall, 4 ... Inlet, 5 ... Hopper, 6 ... Side wall, 7 ... Upper wall part, 10 ... Sludge scraping device, 11 ... upper bearing, 12 ... lower bearing, 13 ... upper rotating shaft, 14 ... lower rotating shaft, 15 ... upper sprocket, 16 ... lower sprocket, 17 ... Flight, 18 ... Rotary drive device, 19 ... Rotating shaft, 20 ... Drive sprocket, 21 ... Drive sprocket, 22 ... Drive chain, 23 ... Intermediate member, 24 ... Bolt, 25 ... Nut, 30 ... Chain, 31 ... Chain link, 32 ... Pin, 33 ... Link plate, 34 ... Barrel, 35 ... Barrel hole 36 ... Connecting hole, 37 ... Flight mounting part, 38 ... Reinforcing part 39 ... mounting portion, 39A ... mounting surface, 40 ... reinforcing piece, 41 ... hole, 42 ... cylindrical portion, 43 ... hole, 50 ... inner chain link piece, 51 ... Hole, 52 ... Cylindrical part, 53 ... Hole, 60 ... Outer chain link piece, 61 ... Hole, 62 ... Cylindrical part, 63 ... Peripheral wall, 64 ... Annular wall, 65 ... inside, 66 ... projection, 70 ... reinforcing piece, 71 ... hole, 72 ... hole, 73 ... hole, 80 ... inner chain Link piece, 81 ... hole, 82 ... hole, 83 ... hole, 90 ... outer chain link piece, 91 ... hole, 92 ... hole, 93 ... peripheral wall, 94 ..Annular wall, 95 ... inner side, 96 ... projection.

Claims (9)

A chain in which a plurality of chain links used in a sludge scraper installed in a settling basin are connected endlessly,
A chain for a sludge scraping device, characterized in that each chain link is composed of a reinforcing piece for reinforcing the chain link and a synthetic resin outer covering member that covers the entire reinforcing piece. In the sludge scraping device chain according to claim 1,
The outer packaging member is composed of outer and inner chain link pieces integrated with the reinforcing piece interposed therein, and the sludge scraping device chain. In the sludge scraping device chain according to claim 2,
The chain for a sludge scraping device, wherein the outer and inner chain link pieces are fitted and integrated with each other. In the sludge scraping device chain according to claim 2 or 3,
The sludge scraping device chain, wherein the outer and inner chain link pieces have connecting means for connecting them together. In the sludge scraping device chain according to claim 4,
The connecting means includes a protrusion provided on one of the outer or inner chain link pieces, and a hole fitted into the protrusion provided on the other of the outer or inner chain link pieces and the reinforcing piece. Sludge scraper chain. In the sludge scraping device chain according to any one of claims 2 to 4,
The chain link piece and the reinforcing piece each have a cylindrical barrel portion that is fitted to one end of the chain link piece and a chain for a sludge scraping device. In the sludge scraping device chain according to any one of claims 1 to 6,
The reinforcing piece is made of metal, ceramic, or a synthetic resin material having a higher tensile strength than the outer packaging member. In the sludge scraping device chain according to any one of claims 1 to 7,
A chain for a sludge squeezing device, characterized in that a synthetic resin mounting portion for attaching a sludge squeezing member to the chain link is provided.   A sludge scraping apparatus installed in a sedimentation basin, comprising the sludge scraping apparatus chain according to any one of claims 1 to 8.

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