JP4897147B2 - Chain structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chain structure used for a sludge scraper provided in a water treatment facility, for example, a settling basin in a sewer sewage treatment facility.
[0002]
[Prior art]
Wastewater such as sewage and rainwater from households and companies is purified through a relay pump station as a sewage treatment facility, a sand basin, a first sedimentation basin, an aeration tank, a final sedimentation basin, a sterilization tank, etc. Released to the sea.
[0003]
Sludge scrapers are installed in the first and final sedimentation basins in the sewage treatment facility, and sludge composed of various components accumulated at the bottom of the sedimentation tanks is settled by the sludge scraper. It collects on one of the bottoms of the pond, sucks out the sludge with a pump and discharges it outside.
[0004]
In such a sludge scraper, as shown in FIG. 5, a plurality of rectangular plate-like flights 12 for sludge scraping are connected in the longitudinal direction of the chain 14 at intervals. Attaching to some link plates (attachments), circulating the chain 14 endlessly in its length direction, the sludge collecting flight 12 is moved in the direction of the arrow, and the sludge is moved to one of the bottoms of the sedimentation basin. It is supposed to collect scents.
[0005]
That is, in the figure, a chain 14 is stretched over each of a drive sprocket wheel 16, a driven sprocket wheel 18, a tail sprocket wheel 20, and an intermediate sprocket wheel 22, and the drive sprocket wheel 16 drives its rotation by a motor (not shown). As a result, the chain 14 circulates endlessly in the length direction. Such a chain 14 has conventionally been formed of plastic or formed of martensitic SUS403 (JIS standard) stainless steel.
[0006]
[Problems to be solved by the invention]
However, the chain 14 made of the conventional plastic is used because it is light and does not corrode. However, the chain 14 is small in strength, easily broken, has low wear resistance, and stretches while being used. Therefore, measures to absorb the elongation are sometimes required. In addition, there is a problem that plastic is difficult to recycle.
[0007]
Further, since the chain 14 made of the above-mentioned conventional stainless steel uses martensitic SUS403 stainless steel, the strength can be increased by heat treatment, the wear resistance is high, and the chain 14 is stretched like a plastic. However, there is a problem that it is easy to corrode and becomes heavy.
[0008]
A chain 14 as shown in FIG. 6 was used as the chain 14 formed of the above-described conventional martensitic SUS403 stainless steel. The chain 14 has a pair of inner link plates 24, 24 facing each other, and a pair of outer link plates 26, which are arranged on the outside of the inner link plates 24, 24 by being shifted by one pitch and connected by pins 28. 26, and between the inner link plates 24, 24, a bush 30 that fits loosely around the pin 28 is provided.
[0009]
The inner link plate 24 and the outer link plate 26 have a constriction at each of the length center portions 24b and 26b, and a maximum width portion 24a having a dimension H1 and a maximum width having a dimension H2 smaller than H1 at both ends thereof. A portion 26a is formed.
[0010]
Such a chain 14 is stretched over a drive sprocket wheel 16 or the like as shown in FIG. 2, and the bush 30 of the chain 14 is locked to the teeth 16a of the drive sprocket wheel 16 and also in the tooth groove 16c. It is supported (see FIG. 2 (a)).
[0011]
Annular protrusions 16b are formed on both front and back sides of the drive sprocket wheel 16 (see FIG. 2B), and when the bush 30 is locked to the teeth 16a and supported by the tooth grooves 16c, the inner links The maximum width portions 24 a and 24 a at both ends of the plate 24 are supported by being in contact with the outer peripheral surface of the annular protrusion 16 b of the drive sprocket wheel 16. At this time, the constricted length center portion 24b of the inner link plate 24 escapes so as not to contact the outer peripheral surface of the annular protrusion 16b of the drive sprocket wheel 16.
[0012]
As described above, in the conventional chain 14, the bush 30 is not only supported by the tooth groove 16 c of the drive sprocket wheel 16, but the maximum width portions 24 a and 24 a at both ends of the inner link plate 24 are also arranged on the outer peripheral surface of the annular protrusion 16 b. Therefore, compared with the case where only the bush 30 of the chain 14 is supported only by the tooth groove 16c of the drive sprocket wheel 16, the support load is distributed and the wear at the contact points is reduced. Can be done.
[0013]
However, such a conventional chain 14 has a maximum width at both end portions of the outer link plate 26 rather than a width dimension H1 of the maximum width portion 24a of the inner link plate 24 due to the relationship between the diameters of the bush 30 and the pin 28. Since the width dimension H2 of the portion 26a is smaller, only the maximum width portion 24a of the inner link plate 24 hits the annular protrusion 16b of the drive sprocket wheel 16, and the maximum width portion 26a (length center portion 26b of the outer link plate 26). No) is not.
[0014]
That is, in the drive sprocket wheel 16 shown in FIG. 4, there are a region C1 facing the inner link plate 24 and a region C2 facing the outer link plate 26 on the outer peripheral surface of the annular protrusion 16b. The maximum width portion 24a of the plate 24 contacts, but the maximum width portion 26a (also the length center portion 26b) of the outer link plate 26 does not contact the region C2.
[0015]
For this reason, since the load concentrates only on the region C1 of the outer peripheral surface of the annular protrusion 16b of the drive sprocket wheel 16 due to the contact with the maximum width portions 24a, 24a of the inner link plate 24, the wear proceeds. 14 is still not sufficient, and the region C1 between the bush 30 and the teeth 16a and the tooth grooves 16c, and the outer peripheral surface of the maximum width portion 24a of the inner link plate 24 and the annular protrusion 16b. There was a problem that the degree of reduction in wear between the two was still not sufficient.
[0016]
Therefore, in view of the above problems, an object of the present invention is to provide a chain structure capable of sufficiently promoting the degree of dispersion of the chain support load and the reduction of wear in the sprocket wheel.
[0017]
[Means for Solving the Problems]
In order to solve the above problems, the chain structure according to the present invention is:
A chain structure used in a sludge scraper for water treatment equipment and supported by a sprocket wheel,
A bush provided at a connection portion between the inner link plate and the outer link plate is locked to and supported by the teeth of the sprocket wheel and in contact with the tooth groove,
Each length center portion of the inner link plate and the outer link plate is supported in contact with the annular protrusion of the sprocket wheel ,
And the length part between the length center part of each said link plate to each both ends is constituted so that it may be gradually separated from the above-mentioned annular projection ,
The inner link plate and the outer link plate,
The dimensions of the maximum width at each end are almost the same,
The width dimension of the constricted part at the center of each length is almost the same,
Each of the inner link plate and the outer link plate is formed in substantially the same outer peripheral shape as a whole.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 to FIG. 4 are views referred to for explaining an embodiment of a chain structure according to the present invention. The same parts and portions as those of the conventional chain 14 and the drive sprocket wheel 16 will be described with the same reference numerals.
[0019]
The chain 34 shown in FIG. 1 is used for a sludge scraper provided in a settling basin in a sewage sewage treatment facility. As with the conventional chain 14 of FIG. 5, a rectangular plate for collecting sludge is attached to some link plates (attachment, not shown) connected at intervals in the length direction of the chain 34. By attaching and circulating the shaped flight 12, sludge accumulated at the bottom of the sedimentation basin can be unilaterally scraped.
[0020]
In FIG. 1, the chain 34 is disposed with a pair of inner link plates 35, 35 facing each other and shifted by one pitch on the outer side of the inner link plates 35, 35, and is coupled by pins 28 (connection members) to face each other. A bush 30 (a connecting member) that loosely fits around the pin 28 is provided between the inner link plates 35 and 35. The inner link plate 35 and the outer link plate 36 have a constriction in the central portion in the length direction, and are formed in substantially the same shape.
[0021]
The inner link plate 35, outer link plate 36, pin 28, bush 30 and attachment for mounting the flight 12 of the chain 34 are made of austenitic SUS304 (JIS standard) stainless steel. For this reason, compared with the chain formed with the conventional plastic, strength is large and wear resistance is large, and since it does not stretch like plastic, it is not necessary to take measures to absorb the elongation.
[0022]
Further, unlike the plastic chain, the chain 34 formed of the austenitic SUS304 stainless steel can be easily recycled.
The chain 34 formed of the austenitic SUS304 stainless steel has an advantage that it cannot be heat-treated as compared to the conventional chain 14 formed of martensitic SUS403 stainless steel, but is hardly corroded. Yes.
[0023]
In this way, all the parts constituting the chain 34 are formed of the same metal SUS304 stainless steel, so that a disadvantage is caused when different chains are assembled to form a chain, that is, a potential difference occurs between different kinds of metals in water. It can prevent flowing and corroding.
[0024]
By the way, the chain 34 made of stainless steel of SUS304 has a lower strength than the chain 14 made of stainless steel of conventional SUS403 (19 ton), but the strength of the chain made of conventional plastic (3 ton). ) Has a strength (6 tons) that is twice as large as).
[0025]
Such a chain 34 is also hung on the drive sprocket wheel 16 as shown in FIG. 2, and the bush 30 of the chain 34 is locked to the teeth 16a of the drive sprocket wheel 16 and supported by the tooth groove 16c. Is done.
[0026]
Annular protrusions 16b are formed on both front and back sides of the drive sprocket wheel 16, and when the bush 30 of the chain 34 is locked to the teeth 16a and supported by the tooth grooves 16c, as shown in FIG. The length center portions 35b and 36b (neck portions) of the link plates 35 and 36 are both supported by being in contact with the outer peripheral surface of the annular protrusion 16b of the drive sprocket wheel 16.
[0027]
That is, in the drive sprocket wheel 16 shown in FIG. 4, there are a region C1 facing the inner link plate 35 and a region C2 facing the outer link plate 36 on the outer peripheral surface of the annular projection 16b. The length center part 35b of the plate 35 contacts, and the length center part 36b of the outer link plate 36 contacts the area C2.
[0028]
Thus, in the chain 34, not only the bush 30 is supported by the tooth groove 16c of the drive sprocket wheel 16, but also the center portions 35b and 36b of the inner link plate 35 and the outer link plate 36 are respectively connected to the annular protrusion 16b. In the case where the chain 14 is supported by the point contact with the maximum width portion 24a of the inner link plate 24 only in the region C1 of the outer peripheral surface of the tooth groove 16c of the drive sprocket wheel 16 and the annular protrusion 16b as in the prior art. Compared with the above, since the central portions 35b and 36b are supported by line contact or surface contact in the tooth gap 16c and the regions C1 and C2 of the annular protrusion 16b, the support load of the chain 34 on the drive sprocket wheel 16 is further dispersed. Thus, it is possible to sufficiently promote the degree of reduction in wear at the contact points with each other.
[0029]
Although the chain 34 has been described in relation to the drive sprocket wheel 16 in the above embodiment, the same applies to the relation to each of the driven sprocket wheel 18, the tail sprocket wheel 20 and the intermediate sprocket wheel 22 in FIG. .
[0030]
In the above embodiment, the case where the inner link plate 35, the outer link plate 36, the pin 28, the bush 30 and the austenitic SUS304 stainless steel are used as the attachment material has been described. Other austenitic stainless steels may be used.
[0031]
In the above embodiment, the chain structure used in the sludge scraper provided in the sedimentation basin in the sewerage sewage treatment facility has been described. The chain structure of the present invention can also be applied to a scraper.
[0032]
Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described embodiments, and various other modifications can be made based on the technical idea of the present invention. It is possible.
[0033]
【Effect of the invention】
As described above, according to the chain structure of the present invention, the connecting member that connects the inner link plate and the outer link plate, and the central portions of the lengths of the inner link plate and the outer link plate are supported by the sprocket wheel. Therefore, it is possible to sufficiently promote the dispersion of the chain support load in the sprocket wheel and the reduction in wear between the members.
[Brief description of the drawings]
FIG. 1 is a view showing the structure of a chain 34 according to an embodiment of the present invention, FIG. 1 (a) is a plan view thereof, and FIG. 1 (b) is a side view thereof.
2 is a view showing a drive sprocket wheel 16 around which a chain 34 of FIG. 1 is wound, FIG. 2 (a) is a partial front view thereof, and FIG. 2 (b) is an upper half sectional view thereof.
FIG. 3 is a partially enlarged front view showing a chain 34 supported by a drive sprocket wheel 16;
4 is a partially enlarged cross-sectional view of the drive sprocket wheel 16 of FIGS. 2 and 3. FIG.
FIG. 5 is a side view schematically showing an entire conventional chain 14 provided in a sludge scraper.
6A and 6B are diagrams showing the structure of a conventional chain 14 provided in a sludge scraper, FIG. 6A is a plan view thereof, and FIG. 6B is a side view thereof.
[Explanation of symbols]
12 Flight 14 Chain 16 Drive sprocket wheel 16a Tooth 16b Annular protrusion 16c Tooth groove 18 Driven sprocket wheel 20 Tail sprocket wheel 22 Intermediate sprocket wheel 24 Inner link plate 24a Maximum width portion 26 Outer link plate 26a Maximum width portion 28 Pin 30 Bush 34 Chain 35 Inner link plate 35b Center length 36 Outer link plate 36b Center length C1, C2 Area H1, H2 Width dimension

Claims (2)

A chain structure used in a sludge scraper for water treatment equipment and supported by a sprocket wheel,
A bush provided at a connection portion between the inner link plate and the outer link plate is locked to and supported by the teeth of the sprocket wheel and in contact with the tooth groove,
Each length center portion of the inner link plate and the outer link plate is supported in contact with the annular protrusion of the sprocket wheel ,
And the length part between the length center part of each said link plate to each both ends is constituted so that it may be gradually separated from the above-mentioned annular projection ,
The inner link plate and the outer link plate,
The dimensions of the maximum width at each end are almost the same,
The width dimension of the constricted part at the center of each length is almost the same,
The chain structure, wherein the inner link plate and the outer link plate are formed in substantially the same outer peripheral shape as a whole.   The chain structure according to claim 1, wherein the connecting portion including the inner link plate, the outer link plate, and the bush is formed of austenitic stainless steel.

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