JP2007170602A - Chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chain which exhibits excellent corrosion resistance and wear resistance and achieves weight reduction. <P>SOLUTION: A link plate 15 forming a chain 1 is provided with offset plates 21a, 21b, 21c and 21d, wherein a bush 33 is fitted to the offset plates 21a, 21b. The bush 33 is made of a synthetic resin, and has notches 35a, 35b for preventing the bush from being rotated alone when fitted to the offset plates. Since the material constituting the bush 33 is synthetic resin, corrosion caused by a potential difference between the bush and the other member can be prevented, thereby improving the corrosion resistance of the chain 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a chain.

  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.

Since the chain used in such a sludge scraper is required to have corrosion resistance and wear resistance, it is often made of stainless steel, and the following is known (Patent Document 1). .
Japanese Utility Model Publication No. 4-64644

However, in the case of such a chain, since all the components of the chain are made of metal, there is a problem that, when metals of different materials come into contact with each other, potentiometric corrosion occurs and the life is shortened.
In addition, there is a problem that potential difference corrosion occurs even when the chain and the sprocket are engaged.
Furthermore, if all the components are made of metal, there is a problem that the weight increases.

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

In order to achieve the above-described object, the present invention provides an outer plate portion in which a pin insertion hole is provided at one end portion, a bushing fit at the other end portion, provided at another end portion of the outer plate portion. An inner plate portion provided with a joint hole; and a pair of offset plates, a bush fitted into the bush fitting hole, and the pin insertion hole and the pin inserted into the bush. The bush is made of a synthetic resin, the bush has a notch at an end, and the bush fitting hole has a shape corresponding to the notch.
The outer plate portion side of the pair of offset plates is defined as the forward direction of the chain.
The synthetic resin may be any of polyacetal, nylon, and ultrahigh molecular polyethylene.
The offset plate and the pin are made of the same material stainless steel.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in corrosion resistance and abrasion resistance, and can provide a lightweight chain.

  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 1 provided with chains 3a and 3b according to the present embodiment, and FIG. 2 is a side sectional view of FIG.

As shown in FIG. 1 and FIG. 2, the sludge scraper 1 is provided in a water storage tank 2, and has chains 3a and 3b provided so as to face each other, and the chain 3a includes sprockets 5a, 5b, and 5c. 5d is engaged.
The sprockets 5a, 5b, 5c, and 5d are pivotally supported by shafts 6a, 6b, 6c, and 6d fixed to the side wall of the water storage tank 2.
Accordingly, the sprockets 5a, 5b, 5c, and 5d are rotated in the direction A in FIG.

The chain 3b meshes with the sprockets 7a, 7b, 7c, and 7d.
The sprockets 7 a, 7 b, 7 c, and 7 d are pivotally supported by shafts 6 a, 6 b, 6 c, and 6 d that are fixed to the side wall of the water storage tank 2.
Therefore, the sprockets 7a, 7b, 7c, and 7d are rotated in the direction A in FIG.

A plurality of long plate-like flights 9 are provided between the chain 3a and the chain 3b, and ends of the flights 9 are connected to the chain 3a and the chain 3b.
Accordingly, the flight 9 rotates in the A direction in FIG. 1 when the chains 3a and 3b rotate in the A direction.

  When the flight 9 rotates in the direction A, as shown in FIG. 2, the flight 9 scrapes the sludge 13 a, 13 b, 13 c that has settled on the bottom of the water storage tank and discards it in the pit 11.

Next, the structure of the chains 3a and 3b will be described. 3 is a detailed view of the chain 3a, and FIG. 4 is a detailed view of the link plate 15 constituting the chain 3a. In FIG. 4, the notation of the attachment plate 17 is omitted.
Moreover, since the structure of the chain 3b is the same as that of the chain 3a, description thereof is omitted.

  As shown in FIG. 3, the chain 3 a has a structure in which a plurality of link plates 15 are coupled. Further, an attachment plate 17 is provided for every fixed number of link plates 15, and flights 9 are connected to the attachment plate 17.

  As shown in FIG. 4, the link plate 15 is composed of offset mold plates 21a and 21b provided so as to face each other. The outer side of the inner plate portion of the offset mold plates 21a and 21b is outside the offset mold plates 21c and 21d. The plate parts are connected.

  The offset type plate 21a includes an outer plate portion 23a and an inner plate portion 25a, and a curved portion 27a is provided between the outer plate portion 23a and the inner plate portion 25a.

  The offset type plate 21b includes an outer plate portion 23b and an inner plate portion 25b, and a curved portion 27b is provided between the outer plate portion 23b and the inner plate portion 25b.

  That is, in the link plate 15, the interval between the outer plate portion 23a and the outer plate portion 23b is wider than the interval between the inner plate portion 25a and the inner plate portion 25b.

A pin insertion hole 29a is provided at the end of the outer plate portion 23a of the offset plate 21a, and a bush fitting hole 31a is provided at the end of the inner plate portion 25a.
A pin insertion hole 29b is provided at the end of the outer plate portion 23b of the offset plate 21b, and a bush fitting hole 31b is provided at the end of the inner plate portion 25b.

The structure of the offset plates 21c and 21d is the same as that of the offset plates 21a and 21b.
That is, the offset plates 21c and 21d are composed of outer plate portions 23c and 23d and inner plate portions 25c and 25d, and curved portions 27c and 27d are provided between the outer plate portions 23c and 23d and the inner plate portions 25c and 25d. ing.

  Pin insertion holes 29c and 29d are provided at the ends of the outer plate portions 23c and 23d, and bush fitting holes 31c and 31d are provided at the ends of the inner plate portions 25c and 25d.

Both ends of the bush 33 are fitted in the bush fitting holes 31a and 31b, respectively.
The bush 33 is provided with a pin through hole 37 penetrating the inside, and a series of chains are inserted by inserting the pin 39 into the pin insertion holes 29c, 29d of the outer plate portions 23c, 23d and the pin through hole 37 of the bush 33. 1 is formed.

Here, the material constituting the bush 33 is a synthetic resin.
Moreover, the material which comprises the offset type | mold plates 21a, 21b, 21c, 21d and the pin 39 is stainless steel of the same material.

  By using a synthetic resin as the material constituting the bush 33, even if the bush 33 and the offset plate 21a, 21b, 21c, 21d, the pin 39 and the tooth portion 43 of the sprocket 41 to be described later contact, corrosion due to a potential difference occurs. The corrosion resistance of the chain 1 can be improved.

  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, UHMW-PE (Ultra High Molecular Weight Polyethylene), and most preferably polyacetal.

In addition, since synthetic resin is an elastic body, even if it fits, it may not rotate between offset type | mold plates 21a and 21b, but may rotate.
Therefore, as shown in FIG. 4, the bush 33 is provided with notches 35a and 35b, and the bush fitting holes 31a and 31b have shapes corresponding to the shapes of the notches 35a and 35b. It has become.

  Therefore, even if the bush 33 tries to rotate, the shape of the notches 35a and 35b prevents the rotation, so that the bush 33 is integrated with the offset plates 21a and 21b and does not rotate.

  Moreover, since the material which comprises the offset type | mold plates 21a, 21b, 21c, 21d and the pin 39 is the same material stainless steel, even if these contact, a potential difference does not arise. Therefore, corrosion due to a potential difference between these members can be prevented, and the corrosion resistance of the chain 1 can be improved.

  When the chain 1 is used, the offset plates 21a, 21b, 21c, and 21d are connected to the outer plate portions 23a, 23b, 23c, and 23d with respect to the traveling direction of the chain 1, and the inner plate portions 25a, 25b, and 25c are used. , 25d is preferably used in an orientation that is more forward than 25d.

  5 and 6 are enlarged views showing the engagement between the chain 3a and the sprocket 41. FIG.

  In FIG. 5, the offset mold plates 21a and 21c are arranged in such a direction that the outer plate portions 23a and 23c are in front of the inner plate portions 25a and 25c with respect to the traveling direction C1 of the chain 1.

  In this case, when the sprocket 41 is rotated in the B1 direction, the tooth portion 43 is engaged with the bush 33 and the chain is advanced in the C1 direction.

  At this time, since the bush 33 is fitted to the offset plates 21a and 21b, the bush 33 does not rotate even if the offset plates 21c and 21d rotate in the direction D1. Therefore, the bush 33 does not slide with the tooth portion 43 due to rotation, and does not wear.

  On the other hand, in FIG. 6, the offset type plates 21a and 21c are arranged in such a direction that the outer plate portions 23a and 23c are rearward of the inner plate portions 25a and 25c with respect to the traveling direction C2 of the chain 1. Yes.

  Also in this case, when the sprocket 41 rotates in the B2 direction, the tooth portion 43 meshes with the bush 33 to advance the chain in the C2 direction. .

  At this time, since the bush 33 is fitted to the offset mold plates 21c and 21d, when the offset mold plates 21c and 21d rotate in the D1 direction, the bush 33 is integrated with the offset mold plates 21c and 21d in the D2 direction. Rotate. Accordingly, the bush 33 slides with the tooth portion 43 by rotation, and wears.

  Therefore, in order to suppress wear of the chain 1, the offset plates 21a, 21b, 21c, 21d are connected to the outer plate portions 23a, 23b, 23c, 23d with respect to the traveling direction of the chain 1, and the inner plate portions 25a, 25b. , 25c, and 25d are preferably arranged and used in the front direction.

Thus, according to this Embodiment, the chain 3a consists of offset type | mold plates 21a, 21b, 21c, 21d, and the bush 33, and the material which comprises the bush 33 is a synthetic resin.
Therefore, corrosion due to a potential difference between the bush 33 and another member can be prevented, and the corrosion resistance of the chain 1 can be improved.

  Further, according to the present embodiment, the notches 35a and 35b are provided at both ends of the bush 33, and the shape of the bush fitting holes 31a and 31b into which the bush 33 is fitted is the notch 35a. , 35b. Therefore, even if the bush 33 is made of a synthetic resin, the bush 33 can be prevented from rotating alone.

  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, in the present embodiment, the material constituting the offset mold plates 21 a, 21 b, 21 c, 21 d and the pins 39 is stainless steel of the same material, but may be a synthetic resin like the bush 33.

The perspective view which shows the sludge scraper 1 provided with the chains 3a and 3b Side sectional view of FIG. Detailed view of chain 3a Detailed view of link plate 15 constituting chain 3a Enlarged view showing meshing of chain 1 and sprocket 41 Enlarged view showing meshing of chain 1 and sprocket 41

Explanation of symbols

1 ………… Sludge squeezer 3a ………… Chain 5a ……… Sprocket 7a ………… Flight 11 ……… Pit 13a …… Sludge 15 ……… Link plate 17 ……… Attachment plate 21a …… Offset type plate 23a …… Outer plate portion 25a …… Inner plate portion 27a …… Bent portion 29a …… Pin insertion hole 31a …… Bush fitting hole 33 ……… Bush 35a …… Notch portion 37 …… ... Pin through hole 39 ......... Pin 41 ......... Sprocket 43 ......... Tooth

Claims (4)

An outer plate portion provided with a pin insertion hole at one end portion, and an inner plate portion provided at another end portion of the outer plate portion and provided with a bush fitting hole at the other end portion. A pair of offset plates;
A bush fitted in the bush fitting hole;
A pin inserted through the pin insertion hole and the bush;
Consists of
The material constituting the bush is a synthetic resin,
The bush has a notch at the end,
The chain, wherein the bush fitting hole has a shape corresponding to the notch.   The chain according to claim 1, wherein the outer plate portion side of the pair of offset type plates is a forward direction of the chain.   The chain according to claim 1, wherein the synthetic resin is any one of polyacetal, nylon, and ultrahigh molecular weight polyethylene.   The chain according to claim 1, wherein the offset plate and the pin are formed of stainless steel of the same material.

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