JP2010048306A - Sprocket wheel and sludge collecting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sprocket wheel excellent in corrosion resistance, simple in structure, and whose teeth are replaceable, and to provide a sludge collecting apparatus using the sprocket wheel. <P>SOLUTION: Bolts 35 are used to joint teeth 19 and a body 16. Bushes 27 with a flange are provided between the bolts 35 and bolt insertion holes 25a, 25b. The bushes 27 with the flange each include a cylindrical part 33, through which a bolt insertion hole 31 is pierced, a flange part 29 provided at one end of the cylindrical part 33, etc. The flange part 29 is larger than the cylindrical part 33 in diameter. Each bolt 35 can pass through the bolt insertion holes 31. The diameter of the flange parts 29 is larger than that of the circumscribing circle of the head of the bolts 35. The bolts 35, passing through the bolt insertion holes 31 of the bushes 27 with flange, are screwed to female threads provided in the bolt insertion holes 25a, 25b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sprocket wheel having excellent corrosion resistance and a simple structure, and a sludge scraping device using the sprocket wheel.

  Conventionally, a sludge collecting machine for collecting sludge and the like precipitated in a settling basin is used as a settling basin in water treatment facilities such as clean water, sewage, and industrial wastewater. In the sludge scraper, a plate-like member called a flight for scraping sludge is provided between a pair of chains, and the sludge at the bottom of the sedimentation basin is collected by moving the flight with the chain.

  The chain is stretched around a plurality of sprocket wheels. Since the sprocket wheel used for the sludge scraper is usually installed in water, high corrosion resistance is required. Therefore, a sprocket wheel used in a sludge scraper may be made of a resin or a metal that has been surface-treated.

  However, the surface treatment is expensive, and when the effect of the surface treatment disappears due to deterioration with time, corrosion proceeds immediately. In addition, although resin sprockets have no problem of corrosion resistance, they are inferior in strength compared to metal sprocket wheels.

  On the other hand, in the sprocket wheel, wear of a tooth portion that is a contact portion with the chain proceeds more than the main body portion. Therefore, in order to improve the service life of the sprocket wheel, a method is adopted in which the tooth portion where wear progresses can be replaced.

  In such a replaceable tooth type sprocket wheel, the tooth body mounting portion is formed radially, the hole provided in the sprocket body is decentered toward the center of the sprocket body from the hole provided in the tooth body, and the inner circumference is There is a replacement sprocket in which each tapered sleeve that can be shrunk and an outer taper bolt are passed through a hole and tightened (Patent Document 1).

  In addition, there is a sprocket wheel in which at least two of the sprocket body, the replacement teeth, and the bolts are made of non-metal or the same material (Patent Document 2).

JP-A-8-233302 JP 2007-198460 A

  However, although the sprocket wheel according to Patent Document 1 can prevent wear due to rattling of the replacement teeth, there is a problem that corrosion occurs when used in water. In other words, the sprocket wheel is usually made of steel, and the bolts are often made of stainless steel due to corrosion resistance.If the mounting bolt and the sprocket wheel are made of different metals in this way, corrosion due to the potential difference of the metal will occur. There is a problem that arises. Further, if all are made of steel, removal may be difficult due to corrosion of the bolts, and if all are made of an expensive material such as stainless steel, the cost increases.

  Further, in the sprocket wheel according to Patent Document 2, corrosion can be prevented because the bolts are made of resin, but the resin bolt is weak in strength and may be damaged during installation. Similarly to Patent Document 1, if all are made of stainless steel or the like, the cost increases.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a sprocket wheel that is excellent in corrosion resistance, has a simple structure, and can replace teeth, and a sludge scraping device using the sprocket wheel. .

  In order to achieve the above-described object, the first invention is a disc-shaped main body, a tooth portion detachably provided on the outer periphery of the main body, a hole provided in the main body, and a hole inserted in the hole. A cylindrical member having a flange portion; and a fastening member that penetrates the cylindrical member and fastens the tooth portion and the main body. The cylindrical member is provided between the main body and the fastening member. This is a sprocket wheel characterized by the above.

  The cylindrical member is preferably made of synthetic resin. Preferably, the fastening member is a bolt, and the outer diameter of the flange portion of the cylindrical member is larger than the outer diameter of the circumscribed circle of the head portion of the bolt.

  The fastening member may be integrated in advance in a state of being inserted into the cylindrical member, and a plurality of protrusions may be provided on the surface of the flange portion.

  According to the first invention, the tubular member having the flange portion is used, and the attachment member used for attachment between the tooth portion and the sprocket body penetrates the tubular member, and the sprocket and the fastening member do not come into contact with each other. For this reason, even if the bolt and the sprocket body are made of different metals, corrosion due to a potential difference does not occur.

  In particular, when the cylindrical member is made of resin, corrosion does not occur at the contact portion between the cylindrical member and the bolt or the sprocket body. Further, if the outer shape of the flange portion is larger than the outer diameter of the circumscribed circle of the head of the bolt that is the fastening member, it is possible to reliably prevent the head of the bolt from contacting the sprocket body. Moreover, if the cylindrical member and the bolt are integrated, the bolt or the cylindrical member is not dropped or the cylindrical member is not forgotten to be attached when the tooth portion is replaced. Further, if a protrusion is provided on the surface of the flange portion, the protrusion functions as a washer when the bolt is tightened, and the bolt can be prevented from loosening.

  A second aspect of the present invention is a sludge scraping device using the sprocket wheel according to the first aspect of the present invention, comprising a chain spanned over the sprocket wheel and a flight provided on the chain.

  According to the second aspect of the present invention, it is possible to provide a sludge scraping device that can prevent corrosion with a simple structure and can replace a worn tooth portion.

  According to the present invention, it is possible to provide a sprocket wheel having excellent corrosion resistance, a simple structure and capable of exchanging teeth, and a sludge scraping device using the sprocket wheel.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a view showing a sludge scraper A using a sprocket 1 according to the present embodiment. The sludge scraper A is installed in the sedimentation basin 5 and mainly includes a sprocket 1, a chain 3, a flight 7, and the like. The chains 3 are respectively provided in the vicinity of both side walls in the width direction of the sedimentation basin 5 (the depth direction in FIG. 1). That is, a total of two sets of chains 3 and sprockets 1 (four on one side) shown in FIG.

  Any one of the sprockets 1 is rotationally driven by a motor (not shown). A chain 3 is stretched over each sprocket 1. The chain 3 is provided with a plurality of long plate-like flights 7 at regular intervals by an attachment (not shown). The flight 7 is a plate-like member having substantially the same length as the width of the sedimentation basin 5, and a pair of chains 3 provided in the width direction of the sedimentation basin 5 are connected so as to extend over the entire length of the sedimentation basin 5 in the width direction. Is provided.

  The sprocket 1 is arranged in the settling basin 5 so that the flight 7 provided on the chain 3 can move along the bottom of the settling basin 5, and the flight 7 moves along with the movement of the chain 3 in the settling basin 5. Circulate around 1

  When the sprocket 1 is rotationally driven in the direction of arrow B by a motor (not shown), the chain 3 meshing with the sprocket 1 moves between the sprockets 1 in the direction of arrow C in accordance with the rotation of the sprocket 1. As the chain 3 moves, the flight 7 also rotates in the settling basin 5. The flight 7 moving along the bottom of the sedimentation basin 5 scrapes the sludge 9 and the like that has settled on the bottom of the sedimentation basin 5. A pit 11 is provided at the end of the sedimentation basin 5, and the sludge 9 and the like scraped by the flight 7 is discarded in the pit 11.

  FIG. 2 is an enlarged view of a portion D in FIG. The sprocket 1 according to the embodiment of the present invention is used for the sprocket of the sludge scraper A. The sprocket 1 is mainly composed of a disc-shaped main body portion 16 and a tooth portion 19. A plurality of notches 15 are provided around the main body 16. Each notch 15 is provided with a tooth portion 19.

  As described above, the sprocket 1 is given a rotational force by a motor (not shown). When the shaft 17 connected to the motor rotates, the sprocket 1 rotates in the direction of arrow E. The chain 3 is hung on the outer peripheral portion of the sprocket 1, and the bush 13 of the chain 3 and the tooth portion 19 of the sprocket 1 are engaged with each other. When the sprocket 1 rotates in the direction of arrow E, a driving force is transmitted from the tooth portion 19 to the chain 3 meshing with the tooth portion 19.

  That is, the tooth portion 19 of the sprocket 1 comes into contact with the bush 13 to transmit a driving force to the bush 13 of the chain 3, and a large force acts between the bush 13. Accordingly, the tooth portion 19 is more worn than the other portions. The sprocket 1 is detachable from the tooth portion 19 where the wear progresses, and only the tooth portion 19 can be replaced as necessary.

  As the material of the tooth portion 19, for example, synthetic resin or ceramics can be used. The synthetic resin is preferably one that has excellent wear resistance and is easy to mold and process. Examples of such a material include polyacetal, nylon, polyester, UHMW-PE (Ultra High Molecular Weight Polyethylene). Moreover, you may use the material which added glass fiber etc. to the synthetic resin. By using such a material, the wear resistance is further improved.

  FIG. 3 is a perspective view of the chain 3. The chain 3 mainly includes an outer plate 71, an inner plate 73, a bush 13, a pin 77, and the like.

  The outer plate 71 is a plate-like member, and pin holes 75 are provided in the vicinity of both ends of the outer plate 71. The inner plate 73 is also a plate-like member, and bush holes 76 are provided near both ends of the inner plate 73. The bush 13 is a cylindrical member having a through hole inside. A pin 77 can be inserted into the hole of the bush 13. The pin 77 is a rod-shaped member.

  A pair of outer plates 71a and 71b are provided facing each other, and inner plates 73a and 73b are provided facing each other inside the outer plates 71a and 71b. A bush 13 is provided between the inner plates 73a and 73b, and both ends of the bush 13 are fitted in the bush holes 76 of the inner plates 73a and 73b, respectively. The pin holes 75 of the outer plates 71a and 71b and the inner plates 73a and 73b and the through holes of the bush 13 are arranged linearly, and the pins 77 are inserted.

  The pin 77 passes through the pin hole 75 of the outer plate 71 b, the through hole of the bush 13, and the pin hole 75 of the outer plate 71 a in this order, and the pin 77 is fitted into the pin hole 75. The pins 77 connect the outer plates 71a and 71b, the inner plates 73a and 73b, and the bush 13, and the chain 3 includes the outer plate 71 (71a and 71b) and the inner plate 73 (73a and 73b) around the pin 77. It is rotatably connected.

  The material of the outer plate 71, the inner plate 73, the bush 13, and the pin 77 is not specified, but resin or metal can be used. For example, polyacetal, nylon, ultra high molecular polyethylene, metal If so, stainless steel, aluminum or the like can be used. Here, in order to prevent corrosion due to the contact potential of the outer plate 71, the inner plate 73, the bush 13, etc., the outer plate 71, the inner plate 73, the bush 13, etc. are made of the same material metal or made of resin. Is desirable.

  Further, a chain 3 ′ further provided with a roller 78 can be used for the straight chain 3 shown in FIG. 3. FIG. 4 shows the chain 3 '. The chain 3 ′ is provided with a cylindrical roller 78 on the outer periphery of the bush 13 of the chain 3. The bush 13 passes through the cylindrical portion of the roller 78, and the roller 78 can rotate with respect to the bush 13. If the roller 78 is made of non-metal such as resin, even if the roller 78 and the sprocket come into contact with each other, corrosion due to a potential difference does not occur.

  Further, instead of the straight type chains 3 and 3 ′, an offset type chain 3 ″ as shown in FIG. 5 can be used. The chain 3 ″ mainly includes an offset plate 79, a bush 13, a pin 83, and the like. The offset plate 79 is a plate-like member, and one end portion is an outer plate portion 81 and the other end portion is an inner plate portion 83. A pin hole 89 is provided in the outer plate portion 81. A bush hole 88 is provided in the inner plate portion 83. A step 85 is provided between the outer plate portion 81 and the inner plate portion 83. Although the outer plate portion 81 and the inner plate portion 83 are not coplanar due to the step 85, the outer plate portion 81 and the inner plate portion 83 are substantially parallel surfaces.

  A pair of offset plates 79a and 79b are arranged so that the outer plate portions 81a and 81b spread outward, and the inner plate portions 83c and 83d of a pair of adjacent offset plates 79c and 79d arranged in the same manner are arranged. The offset plates 79 (79a, 79b, 79c, 79d) are arranged so as to be inside the outer plate portions 81a, 81b.

  A bush 13 having a through hole is provided inside the inner plate portions 83c and 83d, and the bush 13 is fitted into the bush holes 88 of the inner plate portions 83c and 83d. The pin hole 89 and the bush 13 of the outer plate portions 81 a and 81 b are provided in a substantially linear shape, and the pin 87 is inserted into the pin hole 89.

  The pin 87 passes through the pin hole 89 of the outer plate portion 81b, the bush hole 88 of the inner plate portion 83d, the through hole of the bush 13, the bush hole 88 of the inner plate portion 83c, and the pin hole 89 of the outer plate portion 81a in this order. Inserted. The pin 87 is fitted in the pin hole 89, and the outer plate portion 81 and the inner plate portion 83 are rotatably connected to the chain 3 ″ around the pin 87.

  In addition, although the material of the offset plate 79, the bush 13, and the pin 87 is not specified, resin or metal can be used, and if it is made of resin, for example, polyacetal, nylon, ultrahigh molecular polyethylene, or metal, Stainless steel, aluminum, etc. can be used. Here, in order to prevent corrosion due to the contact potential of the offset plate 79, the bush 13, etc., it is desirable that the offset plate 79, the bush 13, etc. be made of the same metal or resin. A roller 78 can also be provided for the chain 3 ″.

  Next, the tooth part 19 will be described. FIG. 6 is a perspective view showing the tooth portion 19 and its periphery. The tooth portion 19 includes a body portion 21 having a concave shape, and flange portions 23 a and 23 b provided at both ends of the body portion 21. The flange portions 23 a and 23 b are provided on the opposite side surfaces at both ends of the body portion 21. Bolt insertion holes 25a and 25b are provided in the flange portions 23a and 23b, respectively. A female screw (not shown) is provided on the inner periphery of the bolt insertion holes 25a and 25b.

  For joining the tooth portion 19 and the main body portion 16, a bolt 35 that is a fastening member is used. Between the bolt 35 and the bolt insertion holes 25a and 25b, a bush 27 with a flange, which is a cylindrical member, is provided.

  The flanged bush 27 includes a cylindrical portion 33 through which the bolt insertion hole 31 passes, a flange portion 29 provided at one end of the cylindrical portion 33, and the like. The outer diameter of the flange portion 29 is larger than the outer diameter of the cylindrical portion 33. Bolts 35 can pass through the bolt insertion holes 31 that penetrate the tube portion 33 and the flange portion 29.

  The outer diameter of the flange portion 29 is larger than the circumscribed circle of the head of the bolt 35. Moreover, the outer diameter of the cylinder part 33 is larger than the bolt insertion holes 25a and 25b. Therefore, the cylinder part 33 is not inserted into the bolt insertion holes 25a and 25b. The bolt 35 penetrates the bolt insertion hole 31 of the bush 27 with flange, and is screwed and joined to female screws provided in the bolt insertion holes 25a and 25b. The flanged bush 27 can be made of synthetic resin, for example.

  Next, the attachment method of the tooth part 19 and the main-body part 16 is demonstrated. FIG. 7 is a view showing a state in which the tooth portion 19 is attached to the main body portion 16. As described above, the notches 15 are provided on the outer periphery of the main body 16 at predetermined intervals. The outer shape of the tooth portion 19 corresponds to the shape of the notch portion 15. Therefore, the tooth portion 19 can be attached to the notch portion 15. A bush insertion hole 37 is provided in the vicinity of the notch 15.

  In order to attach the tooth part 19 to the main body part 16, first, as shown in FIG. 8 (a), the tooth part 19 to be attached to the notch part 15 is prepared and cut as shown in FIG. 8 (b). The tooth portion 15 is fitted into the notch portion 15. At this time, one flange portion 23a is located on the front surface (front side of the drawing) of the main body portion 16, and the other flange portion 23b is located on the rear surface (rear side of the drawing) of the main body portion 16. That is, it attaches so that the main-body part 16 may be pinched | interposed with the flange parts 23a and 23b. Further, as shown in FIG. 8B, when the tooth portion 19 is completely fitted into the notch portion 15, the positions of the bolt insertion holes 25 a and 25 b substantially coincide with the position of the bush insertion hole 37.

  Next, as shown in FIG. 9, the cylindrical portion 33 of the bush 27 with flange is inserted into the bush insertion hole 37. 9A is a front view, and FIG. 9B is a cross-sectional view taken along line FF in FIG. 9A. The diameter of the bush insertion hole 37 is slightly larger than the outer diameter of the cylindrical portion 33 of the flanged bush 27. Therefore, the cylindrical portion 33 can be inserted into the bushing insertion hole 37 of the main body portion 16. Further, the length of the cylindrical portion 33 below the flange portion 29 is substantially equal to the thickness of the main body portion 16. Therefore, in a state in which the flanged bush 27 is completely inserted into the main body portion 16, the flange portion 29 contacts the surface of the main body portion 16, and the end portion of the cylindrical portion 33 substantially coincides with the other side surface of the main body portion 16. .

  Next, as shown in FIG. 10, the bolt 35 is inserted into the bolt insertion hole 31 of the bush 27 with flange, and is screwed into the bolt insertion holes 25a and 25b. 10A is a front view, and FIG. 10B is a cross-sectional view taken along the line GG of FIG. 10A.

  The bolt 35 passes through the flanged bush 27 and is joined to the tooth portion 19. Thus, the attaching operation of the tooth portion 19 is completed. In addition, what is necessary is just to reverse the above process in order to remove the tooth | gear part 19. FIG.

  Thus, according to the sprocket 1 according to the present embodiment, it is possible to obtain the sprocket 1 that is excellent in corrosion resistance, simple in structure, and excellent in attachment / detachment work. Since the penetration part of the main body part 16 of the bolt 35 is covered with the cylindrical part 33 of the bush 27 with flange, and the outer diameter of the flange part 29 is larger than the circumscribed circle of the head part of the bolt 35, the bolt 35 is There is no contact with the main body 16.

  Therefore, for example, even if a stainless steel bolt 35 which is a metal is used, there is no progress of corrosion between the bolt 35 and the steel main body portion 16 due to contact of different metals. For this reason, the sprocket especially suitable for the sludge scraper used underwater can be obtained.

  Further, since the bolt 35 is made of metal, it is not broken during mounting or the like unlike a resin bolt. Moreover, since it is not necessary to make the material of the main-body part 16 and the volt | bolt 35 the same, the material which is more excellent in cost and workability can be selected. Moreover, since only the bush with a flange is attached, the attaching / detaching workability of the tooth portion 19 is excellent.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, although the flanged bush 27 and the bolt 35 are separate members, they may be integrated in advance. FIG. 11 shows a member in which the flanged bush 27 and the bolt 35 are integrated. The bolt 35 and the flanged bush 27 are joined together by adhesion, direct injection molding, or the like. The bolt 35 is made of stainless steel, for example, and the flanged bush 27 is made of synthetic resin.

  By using the flanged bush 27 and the bolt 35 that are integrated, the flanged bush 27 and the bolt 35 can be attached at the same time. In addition, the bush 27 with a flange and the bolt 35 are rarely dropped during work, and there is no fear of forgetting to attach the bush 27 with a flange, for example. Accordingly, it is possible to obtain a sprocket that is particularly excellent in attaching / detaching workability of the tooth portion 19.

  Further, the shape of the flanged bush 27 is not limited to this embodiment. FIG. 12 shows an example in which a protrusion is provided on the flange portion 29. In each example of FIG. 12, the same reference numerals as those in FIG. 6 are given to the constituent elements that perform the same functions as the flanged bush 27 shown in FIG.

  The flanged bush 40 shown in FIG. 12A is provided with a plurality of radially linear protrusions 41 on the upper surface of the flange portion 29. The protrusion 41 has a function as a washer. That is, when the bolt 35 is tightened, the protrusion 41 functions as a washer, and the loosening of the bolt 35 is suppressed.

  Similarly, the flanged bush 50 shown in FIG. 12B is provided with a plurality of columnar protrusions 51 concentrically with the flange portion 29 on the upper surface of the flange portion 29. The protrusion 51 also has a function as a washer, and when the bolt 35 is tightened, loosening of the bolt 35 is suppressed. Similarly, the flanged bush 60 shown in FIG. 12C is provided with a circular protrusion 61 concentrically with the flange portion 29 on the upper surface of the flange portion 29. The protrusion 61 also functions as a washer, and when the bolt 35 is tightened, loosening of the bolt 35 is suppressed. Similarly, a bushing 65 with a flange shown in FIG. 12D is provided with a knurled protrusion 67 on substantially the entire top surface of the flange portion 29. The protrusion 67 also has a function as a washer, and when the bolt 35 is tightened, loosening of the bolt 35 is suppressed.

The figure which shows the sludge scraper A. FIG. 2 is an enlarged view of a portion D in FIG. The perspective view which shows the chain 3. FIG. The perspective view which shows the chain 3 '. The perspective view which shows chain 3 ". The perspective view which shows the tooth | gear part 19. FIG. The figure which shows the attachment state of the tooth | gear part 19 to the main-body part 16. FIG. The figure which shows the attachment method of the tooth | gear part 19 to the main-body part 16. FIG. The figure which shows the attachment method of the tooth | gear part 19 to the main-body part 16. FIG. The figure which shows the attachment method of the tooth | gear part 19 to the main-body part 16. FIG. The figure which shows the state in which the volt | bolt 35 and the bush 27 with a flange were integrated. The figure which shows the example by which protrusion was provided in the flange part 29 upper surface.

Explanation of symbols

A ……… Sludge squeezer 1 ……… Sprocket 3 ……… Chain 5 ……… Sedimentation basin 7 ……… Flight 9 ……… Sludge 11 ……… Pit 13 ……… Bush 15 ……… Notch 16 ......... Main body part 17 ......... Shaft 19 ......... Tooth part 21 ......... Same part 23a, 23b ...... Flange part 25a, 25b ......... Bolt insertion hole 27 ......... Bushing with flange 29 ... ... Flange part 31 ......... Bolt insertion hole 33 ......... Cylinder part 35 ......... Bolt 37 ......... Bushing insertion hole 40, 50, 60, 65 ......... Bushings with flanges 71a, 71b, 71c, 71d ... ... Outer plate 73a, 73b, 73c, 73d ......... Inner plate 75 ......... Pin hole 76 ......... Bush hole 77 ......... Pin 78 ......... Rollers 79a, 79b, 79c, 79d ......... Offset plate Rate 81a, 81b, 81c, 81d ......... Outer plate part 83a, 83b, 83c, 83d ......... Inner plate part 85 ......... Step 87 ......... Pin 88 ......... Bushing hole 89 ......... Pin hole

Claims (6)

A disc-shaped body,
A tooth portion detachably provided on the outer periphery of the main body;
A hole provided in the body;
A cylindrical member inserted into the hole and having a flange portion;
A fastening member that penetrates the tubular member and fastens the tooth portion and the main body;
The sprocket wheel is characterized in that the cylindrical member is provided between the main body and the fastening member.   2. The sprocket wheel according to claim 1, wherein the cylindrical member is made of a synthetic resin. The fastening member is a bolt;
The sprocket wheel according to claim 1 or 2, wherein an outer diameter of the flange portion of the cylindrical member is larger than an outer diameter of a circumscribed circle of a head portion of the bolt.   The sprocket wheel according to any one of claims 1 to 3, wherein the fastening member is integrated in advance in a state where the fastening member is inserted into the cylindrical member.   The sprocket wheel according to any one of claims 1 to 4, wherein a plurality of protrusions are provided on a surface of the flange portion. Using the sprocket wheel according to any one of claims 1 to 5,
A chain that spans the sprocket wheel;
A flight provided in the chain;
A sludge scraping device characterized by comprising:

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