JP2007198461A - Chain-sprocket mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chain-sprocket mechanism having a superior corrosion-resistant property. <P>SOLUTION: The chain-sprocket mechanism 1a is provided with a chain 7b and sprocket 9a, in which the chain 7a is engaged with the sprocket 9a. The sprocket 9a has a plurality of teeth 21 on its outer periphery. The chain 7a has plate-shaped outer plates 23a and 23b which are opposite with each other, and inner plates 25a and 25b are arranged inside of the outer plates 23a and 23b. A cylindrical bush 27 is fitted on the inner plates 25a and 25b, and is also engaged with the teeth 21 of the sprocket 9a. At least one surface of the bush 27 and teeth 21 is made of a nonmetallic material. Upon forming one of them by the nonmetallic material, the corrosion-resistant property of the chain-sprocket mechanism 1a can be improved so that corrosion caused by an electric potential difference is not generated in spite of contact between the bush 27 and teeth 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a chain / sprocket mechanism.

  Water treatment apparatuses such as clean water, sewage, and industrial wastewater include an apparatus called a sludge collecting machine that collects sand, sludge, and the like that have settled at the bottom of a sedimentation basin and sand basin.

  A sludge scraper usually has a plate called a flight that collects sludge between a pair of chains. By rotating the chain, the flight moves through the bottom of the sedimentation basin and sedimentation basin, and sand and sludge are collected. Collect etc.

  A chain usually connects a plurality of outer links and a plurality of inner links by means of pins, and each inner link is composed of a pair of opposed inner plates and bushes provided at both ends and having through holes. Yes.

  Each outer link is constituted by a pair of opposing outer plates and pins provided through the inner plate, the outer plate, and the bush.

The chain may be constituted by an offset type plate in which an inner plate and an outer plate are integrated.
In some cases, a rotatable roller is provided on the outer periphery of the bush.

The chain is provided between a plurality of gears called sprockets, and the sprocket teeth mesh with the chain bushings or rollers.
Therefore, when the sprocket rotates, the chain moves, and the flight provided on the chain collects sand, sludge and the like.

The following is known as such a chain / sprocket mechanism (Patent Document 1).
Japanese Utility Model Publication No. 4-64644

However, in such a mechanism, the chain and the sprocket are often made of different materials.
Therefore, when such a mechanism is used in a water treatment apparatus, there is a problem that when the chain and the sprocket come into contact with each other, corrosion due to a potential difference of metal occurs.

  The present invention has been made in view of such problems, and an object thereof is to provide a chain and sprocket mechanism having excellent corrosion resistance.

  In order to achieve the above-mentioned object, the first invention has a disk-like shape, a plurality of teeth are provided on the outer periphery, and a sprocket that is rotatably provided so as to contact the teeth of the sprocket. A chain that moves with the rotation of the sprocket, and the chain includes a pair of outer plates provided to face each other and a pair of inner plates provided on the inner side of the outer plate. And a structure in which a plurality of link plates including a cylindrical bush fitted to the inner plate and in contact with the teeth, and an outer plate, the inner plate, and a pin provided through the bush are connected. And at least one of the teeth and the bush is a chain / sprocket mechanism characterized in that the material constituting the surface is non-metallic.

The nonmetal may be a ceramic or a synthetic resin.
The synthetic resin may be nylon, polyacetal, polyester, or ultrahigh molecular polyethylene, and the synthetic resin may contain an additive.
The material constituting the surfaces of the inner plate and the outer plate may be the non-metal.
The chain may further include a cylindrical roller around the bush, and the material constituting the roller may be the non-metal.

  The second invention has a disk-like shape, a plurality of teeth are provided on the outer periphery, the sprocket is provided so as to be rotatable, the sprocket is provided in contact with the teeth of the sprocket, and the sprocket is rotated. The chain is fitted to the inner plate, a pair of outer plates provided so as to face each other, a pair of inner plates provided on the inner side of the outer plate, and the chain. A plurality of link plates comprising a cylindrical bush contacting the teeth, and the outer plate, the inner plate, and a pin provided through the bush, the teeth and the teeth The bush is a chain / sprocket mechanism characterized in that the material constituting the surface is the same metal.

The metal may be stainless steel.
The material constituting the surfaces of the inner plate and the outer plate may be the same metal.
The chain may further include a cylindrical roller around the bush, and the material constituting the roller may be the same metal.

  ADVANTAGE OF THE INVENTION According to this invention, the chain sprocket mechanism excellent in corrosion resistance can be provided.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a perspective view showing a sludge scraper 3 provided with chain and sprocket mechanisms 1a and 1b according to the present embodiment, and FIG. 2 is a side sectional view of FIG.

As shown in FIGS. 1 and 2, the sludge scraper 3 is provided in the water storage tank 5 and has chains 7 a and 7 b provided so as to face each other.
The chain 7a meshes with the sprockets 9a, 9b, 9c and 9d, and the chain 7a and the sprockets 9a, 9b, 9c and 9d constitute a chain / sprocket mechanism 1a.

The sprockets 9a, 9b, 9c, 9d are pivotally supported by shafts 11a, 11b, 11c, 11d fixed to the side wall of the water storage tank 5.
Accordingly, when the sprockets 9a, 9b, 9c, 9d are rotated, the chain 7a is rotated in the direction A in FIG.

  The chain 7b meshes with the sprockets 13a, 13b, 13c, and 13d, and the chain 7b and the sprockets 13a, 13b, 13c, and 13d constitute a chain / sprocket mechanism 1b.

The sprockets 13a, 13b, 13c, and 13d are pivotally supported by shafts 11a, 11b, 11c, and 11d fixed to the side wall of the water storage tank 5.
Therefore, when the sprockets 13a, 13b, 13c, and 13d are rotated, the chain 7b is rotated in the direction A in FIG.

A plurality of long plate-like flights 15 are provided between the chain 7a and the chain 7b, and ends of the flights 15 are connected to the chain 7a and the chain 7b.
Accordingly, the flight 15 rotates in the A direction in FIG. 1 when the chains 7a and 7b rotate in the A direction.

  When the flight 15 rotates in the direction A, as shown in FIG. 2, the flight 15 gathers the sludge 17 a, 17 b, 17 c that has settled on the bottom of the water storage tank 5 and discards it in the pit 19.

Next, the meshing structure between the sprocket and the chain will be described. FIG. 3 is an enlarged view of the vicinity of the sprocket 9a of FIG.
Note that the meshing structure of the sprockets 9b, 9c, 9d, 13a, 13b, 13c, and 13d and the chain is the same as the meshing structure of the sprocket 9a and the chain, and thus the description thereof is omitted.

As shown in FIG. 3, the sprocket 9a has a plurality of teeth 21 on the outer periphery.
The chain 7a has plate-like outer plates 23a and 23b facing each other, and inner plates 25a and 25b are provided inside the outer plates 23a and 23b.

A cylindrical bush 27 is fitted to the inner plates 25 a and 25 b, and the bush 27 meshes with the teeth 21.
The detailed structure of the chain 7a will be described later.

  When the sprocket 9a is rotated in the B direction in FIG. 3, the chain 7a moves in the C direction and the D direction in FIG.

Next, the constituent members of the chain 7a will be described in detail.
FIG. 4 is a detailed view showing the constituent members of the chain 7a, and FIGS. 5 and 6 are views showing modifications of the chain 7a. In addition, since the structural member of the chain 7b is the same as that of the chain 7a, description is abbreviate | omitted.

  As shown in FIG. 4, the chain 7a has plate-like outer plates 23a and 23b facing each other, and the outer plates 23a and 23b have pin insertion holes 29a, 30a, 29b, and 30b at their ends. .

  The chain 7a has plate-like inner plates 25a and 25b facing each other, and the inner plates 25a and 25b have bush fitting holes 31a, 33a, 31b and 33b, respectively, at their ends.

  Both ends of the cylindrical bush 27 are fitted in the bush fitting holes 33a and 33b, respectively.

The bush 27 is provided with a through hole 35 penetrating the inside, and a series of chains 7a are formed by inserting a rod-like pin 37 into the pin insertion holes 29a, 29b of the outer plates 23a, 23b and the through hole 35 of the bush 27. Is formed.
The outer plates 23a and 23b and the pin 37 constitute an outer link, and the inner plates 25a and 25b and the bush 27 constitute an inner link.

Here, at least one surface of the bush 27 of the chain 7a or the tooth 21 of the sprocket 9a is made of a non-metal.
Thus, by comprising one side with a non-metal, even if the bush 27 and the tooth | gear 21 contact, corrosion by a potential difference will not be caused, but the corrosion resistance of the chain 7a and the sprocket 9a can be improved.
That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.
Since the chain / sprocket mechanism 1b is the same, the description thereof is omitted.

  Here, the nonmetal is, for example, synthetic resin, ceramics, or the like.

  The synthetic resin is preferably one that has excellent wear resistance and is easy to mold and process. Examples of such materials include polyacetal, nylon, polyester, and 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 of the bush 27 or the tooth 21 is further improved.

  In addition, since non-metal should just be provided in the contact surface of the bush 27 and the tooth | gear 21, non-metal may be provided in the surface of the bush 27 and the tooth | gear 21 by coating etc., and the bush 27 and the whole tooth | gear 21 are not covered. You may comprise with a metal.

Moreover, you may comprise the surface of not only the bush 27 and the tooth | gear 21 but the outer plates 23a and 23b and the inner plates 25a and 25b with a nonmetal.
By adopting such a configuration, even when the outer plates 23a, 23b, the inner plates 25a, 25b and the teeth 21 come into contact with each other, corrosion due to a potential difference does not occur, and the corrosion resistance of the chain 7a and the sprocket 9a can be further improved. it can.

  On the other hand, you may comprise the bush 27 of the chain 7a, and the surface of the tooth | gear 21 of the sprocket 9a with the same kind of metal. Thus, by comprising both with the same kind of metal, even if the bush 27 and the tooth | gear 21 contact, corrosion by a potential difference will not be caused, but the corrosion resistance of the chain 7a and the sprocket 9a can be improved.

That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.
The same applies to the chain / sprocket mechanism 1b.

Here, as a metal, the thing excellent in corrosion resistance and abrasion resistance is preferable.
An example of such a material is stainless steel.

Moreover, you may comprise the surface of not only the bush 27 and the tooth | gear 21 but the outer plates 23a and 23b and the inner plates 25a and 25b with the same kind of metal.
By adopting such a configuration, even when the outer plates 23a, 23b, the inner plates 25a, 25b and the teeth 21 come into contact with each other, corrosion due to a potential difference does not occur, and the corrosion resistance of the chain 7a and the sprocket 9a can be further improved. it can.
That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.

A chain 8a shown in FIG. 5 may be used as the chain.
The structure of the chain 8a is substantially the same as that of the chain 7a, but a cylindrical roller 40 is provided on the outer periphery of the bush 27.

When such a chain 8a is used, since the roller 40 and the teeth 21 are in contact with each other, the surface of the roller 40 is preferably made of a non-metal.
By adopting such a configuration, even when the roller 40 and the teeth 21 come into contact with each other, corrosion due to a potential difference does not occur, and the corrosion resistance of the chain 8a and the sprocket 9a can be improved.
That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.

Or you may comprise the roller 40 and the tooth | gear 21 with the same kind of metal.
By adopting such a configuration, even when the roller 40 and the teeth 21 come into contact with each other, corrosion due to a potential difference does not occur, and the corrosion resistance of the chain 8a and the sprocket 9a can be improved.
That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.

On the other hand, a chain 10a shown in FIG. 6 may be used as the chain.
The chain 10a is a so-called offset plate in which an inner plate and an outer plate are integrated.

  As shown in FIG. 6, the chain 10a has a structure in which offset type plates 41a, 41b, 41c, and 41d are opposed to each other, and the offset type plates 41a, 41b, 41c, and 41d are outer plate portions 43a, 43b, and 43c. , 43d and inner plate portions 45a, 45b, 45c, 45d are joined by curved portions 47a, 47b, 47c, 47d.

  Pin insertion holes 49a, 49b, 49c, 49d are provided at the end portions of the outer plate portions 43a, 43b, 43c, 43d, and bush fitting holes are provided at the end portions of the inner plate portions 45a, 45b, 45c, 45d. 51a, 51b, 51c, 51d are provided.

A cylindrical bush 53 is fitted into the bush fitting holes 51a and 51b.
The bush 53 is provided with a pin through hole 57 penetrating the inside, and a series of chains are inserted by inserting the pin 59 into the pin insertion holes 49c, 49d of the outer plate portions 43c, 43d and the pin through hole 57 of the bush 53. 10a is formed.

Even when such a chain 10a is used as the chain, by forming at least one surface of the bush 53 and the tooth 21 with a non-metal, even if the bush 53 and the tooth 21 are in contact with each other, corrosion due to a potential difference may occur. In addition, the corrosion resistance of the chain 10a and the sprocket 9a can be improved.
That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.

Moreover, you may comprise the surface of not only the bush 53 and the tooth | gear 21, but the offset type | mold plates 41a, 41b, 41c, 41d with a nonmetal.
By adopting such a configuration, even when the offset type plates 41a, 41b, 41c, 41d and the teeth 21 are in contact with each other, corrosion due to a potential difference does not occur, and the corrosion resistance of the chain 10a and the sprocket 9a can be further improved. .
That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.

Or you may comprise the bush 53 and the tooth | gear 21 with the same kind of metal.
By configuring the bush 53 and the tooth 21 with the same kind of metal, even if the bush 53 and the tooth 21 come into contact with each other, corrosion due to a potential difference does not occur, and the corrosion resistance of the chain 10a and the sprocket 9a can be improved.
That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.

When the bush 53 and the tooth 21 are made of the same kind of metal, the surfaces of the offset plates 41a, 41b, 41c, and 41d may be made of the same kind of metal.
With such a structure, even if the offset plates 41a, 41b, 41c, 41d and the teeth 21 come into contact with each other, corrosion due to a potential difference does not occur, and the corrosion resistance of the chain 10a and the sprocket 9a can be improved.
That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.

A cylindrical roller may be provided around the bush 53 of the chain 10a.
When the roller is provided, the surface of the roller is made of a non-metal, so that corrosion due to a potential difference does not occur even when the roller contacts the teeth 21, and the corrosion resistance of the chain 10a and the sprocket 9a can be improved.
That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.

Or you may comprise a roller and the tooth | gear 21 with the same kind of metal.
By configuring the rollers and the teeth 21 with the same kind of metal, even if the rollers and the teeth 21 come into contact with each other, corrosion due to a potential difference does not occur, and the corrosion resistance of the chain 10a and the sprocket 9a can be improved.
That is, the corrosion resistance of the chain / sprocket mechanism 1a can be improved.

Thus, according to the present embodiment, the chain / sprocket mechanism 1a, 1b has the chain and the sprocket, and the surface of at least one of the bush 27 of the chain or the tooth 21 of the sprocket 6a is made of a non-metal. .
Therefore, corrosion due to the potential difference between the chain and the sprocket can be prevented, and the corrosion resistance of the chain / sprocket mechanisms 1a and 1b can be improved.

  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.

Perspective view showing the sludge scraper 3 Side sectional view of FIG. Enlarged view near the sprocket 9a Detailed view showing components of chain 7a The figure which shows the modification of the chain 7a The figure which shows the modification of the chain 7a

Explanation of symbols

1a ... Chain sprocket mechanism 3 ... Sludge scraper 5 ... Water tank 7a ... Chain 9a ... Sprocket 11a ... Shaft 13a ... Sprocket 15 ... Flight 17a ... Sludge 19 ......... Pit 21 ......... Tooth 23a ... Outer plate 25a ... Inner plate 27 ...... Bush 29a ... Pin insertion hole 30a ... Pin insertion hole 31a ... Bush fitting hole 33a ... Bush fitting Hole 35 ......... Through hole 37 ......... Pin 40 ...... Roller 41a ... Offset plate 53 ...... Bush

Claims (11)

A sprocket having a disk-like shape, provided with a plurality of teeth on the outer periphery and rotatably provided;
A chain that is provided in contact with the teeth of the sprocket and moves with the rotation of the sprocket;
Consists of
The chain is
A pair of outer plates provided to face each other;
A pair of inner plates provided inside the outer plate;
A cylindrical bush fitted to the inner plate and in contact with the teeth;
A pin provided through the outer plate, the inner plate, and the bush;
It has a structure where multiple link plates consisting of
The chain / sprocket mechanism is characterized in that a material constituting the surface of at least one of the teeth and the bush is non-metallic.   2. The chain and sprocket mechanism according to claim 1, wherein the nonmetal is ceramic.   2. The chain and sprocket mechanism according to claim 1, wherein the nonmetal is a synthetic resin.   4. The chain / sprocket mechanism according to claim 3, wherein the synthetic resin is any one of nylon, polyacetal, polyester, and ultrahigh molecular weight polyethylene.   The chain sprocket mechanism according to claim 3, wherein the synthetic resin contains an additive.   2. The chain and sprocket mechanism according to claim 1, wherein the material constituting the surfaces of the inner plate and the outer plate is the non-metal.   The chain / sprocket mechanism according to claim 1, wherein the chain further includes a cylindrical roller around the bush, and a material constituting the roller is the non-metal. A sprocket having a disk-like shape, provided with a plurality of teeth on the outer periphery and rotatably provided;
A chain that is provided in contact with the teeth of the sprocket and moves with the rotation of the sprocket;
Consists of
The chain is
A pair of outer plates provided to face each other;
A pair of inner plates provided inside the outer plate;
A cylindrical bush fitted to the inner plate and in contact with the teeth;
A pin provided through the outer plate, the inner plate, and the bush;
It has a structure where multiple link plates consisting of
The chain and sprocket mechanism according to claim 1, wherein the teeth and the bush are made of the same metal.   9. The chain and sprocket mechanism according to claim 8, wherein the metal is stainless steel.   9. The chain / sprocket mechanism according to claim 8, wherein the material constituting the surfaces of the inner plate and the outer plate is the metal made of the same material.   9. The chain sprocket mechanism according to claim 8, wherein the chain further includes a cylindrical roller around the bush, and the material constituting the roller is the metal made of the same material.

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