JP4689654B2 - Sprocket and sludge collecting device - Google Patents

Description

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

2. Description of the Related Art Conventionally, a sludge collecting machine that collects sludge and the like precipitated in a sedimentation basin is used as a sedimentation 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 over a plurality of sprockets and driven by at least one sprocket. That is, the sprocket has a function of changing the moving direction of the chain and a function of giving a driving force to the chain. Moreover, since the sprocket used for a sludge scraper is normally installed in water, high corrosion resistance is requested | required. Therefore, the sprocket used for the sludge scraper may be made of resin or metal that has undergone surface treatment.

However, the surface treatment is expensive, and when the effect of the surface treatment disappears due to deterioration with time, corrosion proceeds immediately. On the other hand, although resin sprockets have no problem of corrosion resistance, they are inferior in strength compared to metal sprockets. In particular, since a large force is applied to the key portion provided to suppress the rotational slip between the shaft that drives the sprocket to rotate and the sprocket, the strength of the key groove provided in the resin sprocket becomes a problem. For this reason, the strength of the key groove is required for the sprocket as well as corrosion resistance.

As a sprocket having both such corrosion resistance and key groove strength, there is a sprocket wheel in which resin teeth and bosses and a metal bush are provided, and a key groove is provided in the metal bush (Patent Document 1). ).
JP 2002-276773 A

However, the sprocket wheel according to Patent Document 1 has a problem that since the entire shaft driving the sprocket wheel is made of metal, the sprocket wheel itself is heavy and the load on the motor is large. Further, since the metal bush is large and the shape is complicated, it is difficult to manufacture the bush, and there is a problem that the manufacturing cost is high.

The present invention has been made in view of such problems, and an object of the present invention is to provide a sprocket having excellent corrosion resistance, high strength of a key groove portion, a simple structure and a light weight, and a sludge scraping device using the sprocket. To do.

  In order to achieve the above-mentioned object, a first invention is a sprocket comprising a main body member and a pair of bosses having a shaft hole, wherein the main body member and / or the boss is polyacetal, nylon, superpolymer. It is made of resin made of polyethylene, and a plate installation part is provided on the upper surface of the boss at a depth up to the vicinity of the shaft hole, and a stainless steel plate with a key groove is installed in the plate installation part The main body member and the pair of plates are sandwiched by the bosses, and the plates are in the same position on both sides of the main body.

According to the first invention, since the metal plate is provided in the key groove portion, the strength of the key groove portion is high and the wear resistance is excellent. Since the main body member and the boss are made of resin, the corrosion resistance is high. Since it is provided only in the groove portion, it is possible to provide a sprocket that has a simple structure, is lightweight, and is easy to manufacture.

The second invention comprises a drive sprocket driven by a motor, a freely driven follower sprocket, a chain spanned between the drive sprocket and the follower sprocket, and a flight provided on the chain, The drive sprocket is a sprocket according to any one of claims 1 to 7, and is a sludge scraping device.

According to the second invention, since the drive sprocket is provided with a key groove on a metal plate, the strength of the key groove part receiving particularly force is high and the wear resistance is excellent, and the main body member and the boss are made of resin. Therefore, the corrosion resistance is high, and since the plate is used only for the key groove portion, the weight of the sprocket is light, and a sludge scraping device with a small load on the motor that rotates the sprocket can be provided.

ADVANTAGE OF THE INVENTION According to this invention, it is excellent in corrosion resistance, the intensity | strength of a keyway part is high, and a simple structure can provide the sludge scraping apparatus using the said sprocket.

Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a configuration diagram of a sprocket 1 according to the present embodiment, and FIG. 2 is an assembly diagram of the sprocket 1. The sprocket 1 mainly includes a sprocket body 3, a boss 7, a plate 9, and the like.

The sprocket body 3 is a disk-shaped member having a plurality of teeth 5 around it, and a boss hole 11 penetrating the sprocket 1 is provided at the center. The teeth 5 are portions that mesh with the chain, and are provided at regular intervals around the sprocket body 3. A bolt hole 13 is provided around the boss hole 11.

The boss 7 is a cylindrical member having a shaft hole 15 penetrating the boss 7 at the center. The shaft hole 15 is a part where a shaft for rotating the sprocket 1 is provided. Around the shaft hole 15 on one end face of the boss 7, a ring-shaped convex portion 20 is provided concentrically with the shaft hole 15. The outer diameter of the convex portion 20 is substantially equal to the diameter of the boss hole 11 of the sprocket 1, and the convex portion 20 is fitted into the boss hole 11.

A plate installation portion 19 is provided on the upper surface of the boss 7 where the convex portion 20 is provided. The plate installation part 19 is a part where a plate 9 to be described later is installed. Around the convex portion 20 (shaft hole 15), a plurality of bolt holes 17 penetrating the boss 7 are provided. At least one location of the bolt hole 17 is provided at a position penetrating the plate installation portion 19. The bolt hole 17 is provided in a shape into which the bolt 23 can be inserted.

The plate 9 is a plate-like member and is provided with a bolt hole 21 that penetrates the plate 9. As described above, the plate 9 has substantially the same width and thickness as the plate setting portion 19 provided on the boss 7. Although the shape of the plate 9 may be a rectangular parallelepiped, in order to prevent the plate 9 from protruding from the circumference of the boss 7 when the plate 9 is installed in the plate installation part 19, as shown in FIG. The upper corner of 9 may be cut out so as to match the circumferential shape of the boss 7 to form a hexagon.

The sprocket body 3 is sandwiched between a pair of bosses 7. The plate 9 is installed in the plate installation unit 19. The plate 9 is arranged to be at the same position on both sides of the sprocket body 3. At this time, the positions of the bolt holes 13 of the sprocket body 3 coincide with the positions of the respective bolt holes 17 and 21 of the boss 7 and the plate 9. Accordingly, the bolt 23 is inserted into the bolt hole 17 of the boss 7, passes through the bolt hole 13 of the sprocket body 3 and the bolt hole 21 of the plate 9, and is inserted to the opposite boss 7. A nut 25 is provided at the end of the bolt 23 and is fixed by a pair of bosses 7 so as to sandwich the sprocket body 3 and the plate 9.

The sprocket body 3 and the boss 7 may be made of a material having corrosion resistance, and is preferably made of a resin in consideration of the corrosion resistance, and more preferably polyacetal, nylon, or superpolymer having excellent corrosion resistance, workability, and the like. Polyethylene can be used. Moreover, the material of the plate 9 should just have intensity | strength more than a certain amount, and when it considers intensity | strength, it is desirable that it is metal, More desirably, stainless steel which is excellent also in abrasion resistance and corrosion resistance can be used.

3A and 3B are diagrams showing the sprocket 1, FIG. 3A is a front view of the sprocket 1, and FIG. 3B is a cross-sectional view taken along line AA in FIG. 3A. As shown in FIG. 3A, the plate 9 is installed on the plate installation portion 19 of the boss 7, and does not protrude from the circumference of the boss 7 at this time. Further, since the bottom surface of the plate installation part 19 is provided up to the vicinity of the shaft hole 15, the plate 9 fitted in the plate installation part 19 is arranged so that the bottom surface of the plate 9 comes to the vicinity of the shaft hole 15 provided in the boss 7. Installed.

As shown in FIG. 3B, the convex portion 20 of the boss 7 is fitted into the boss hole 11 of the sprocket body 3. Accordingly, the axes of the shaft holes 15 of the respective bosses 7 provided facing each other coincide. The plate 9 is provided between the boss 7 and the sprocket body 3 and is provided at the same position with the sprocket body 3 interposed therebetween. The boss 7 and the plate 9 are fixed to the sprocket body 3 by bolts 23. In addition, since the thickness of the plate installation part 19 and the plate 9 is substantially the same, the plate 9 does not move by rattling while being sandwiched between the boss 7 and the plate body 3.

4A and 4B are diagrams showing a state in which the keyway 27 is provided in the sprocket 1, FIG. 4A is a front view of the sprocket 1, and FIG. 4B is a cross-sectional view taken along line AA in FIG. is there. The key groove 27 is a groove having a rectangular cross section provided in the shaded portion in FIG. 4A and extending from the shaft hole 15 to the plate 9. As shown in FIG. 4B, the key groove 27 is provided through the boss 7 and the plate 9. That is, the key groove 27 is provided on the bottom surface of the plate 9 and has a rectangular cross section having an open portion in the shaft hole 15.

In addition, as shown in FIG. 4, the position of the key groove 27 of each plate 9 which pinches | interposes the sprocket 1 does not shift | deviate by processing the key groove 27 after the assembly of the sprocket 1. FIG. Therefore, the key 29 can be easily installed in the key groove 27 described later. However, if there is no problem in the processing accuracy of the keyway 27, the plate 9 and the boss 7 having the keyway 27 in advance can be used before assembly. In this case, when the sprocket 1 is assembled, it is necessary to assemble so that the positions of the key grooves 27 provided in each of the pair of plates 9 coincide with each other with the sprocket body 3 interposed therebetween.

FIG. 5 is a view showing a state where the shaft 33 and the key 29 are provided on the sprocket 1. A shaft 33 is inserted into the shaft hole 15 of the sprocket 1. The shaft 33 is an axis that rotates the sprocket 1 and has a keyway 31. The key groove 31 is substantially the same width as the key groove 27 and is provided in the axial direction of the shaft 33. The key groove 31 of the shaft 33 and the key groove 27 provided in the sprocket 1 are aligned, and a key 29 is inserted into a rectangular cross section formed by the key groove 27 and the key groove 31.

The key 29 is a plate-like member having a rectangular cross section having substantially the same width as the key groove 27 and the key groove 31. The key 29 is provided across the pair of plates 9 and is fitted into a key groove 27 provided in each plate 9. That is, the length of the key 29 is a length that can span at least the pair of plates 9 that sandwich the sprocket body 3, and the length of the key groove 31 provided in the shaft 33 is at least that of the key 29. A groove of possible length. Further, the thickness of the key 29 is such a thickness that the key 29 can be fitted over both the key groove 27 and the key groove 31 when the key 29 is installed in the key groove 27 and the key groove 31.

When a rotational force is applied to the shaft 33, the rotational force is transmitted from the shaft 33 to the sprocket 1 by the key 29. That is, the rotational force by the shaft 33 is transmitted to the key 29 provided in the key groove 31, and the key 29 transmits the rotational force to the key groove 27 provided in the plate 9, and the sprocket 1 provided with the plate 9. Rotate the whole. Therefore, the shaft 33 and the sprocket 1 rotate together without causing rotational slip.

The shaft 33 and the key 29 are preferably made of metal in consideration of strength and wear resistance. When the shaft 33 and the key 29 are made of metal, the shaft 33 and the key 29 are preferably made of the same material as the plate 9 in consideration of corrosion resistance.

Thus, according to the sprocket 1 according to the present embodiment, since the sprocket body 3 and the boss 7 are formed of a resin having corrosion resistance, the corrosion resistance is excellent, and the key groove 27 provided on the sprocket 1 and Since the key 29 is fitted in the key groove 31 provided in the shaft 33 that rotates the sprocket 1, the shaft 33 and the sprocket 1 do not rotate and slip, and the key groove 27 provided in the sprocket 1 has strength. Since the key groove 27 that receives a large force from the key 29 is not damaged and is not worn, the plate 9 is a plate-like member provided only in the vicinity of the key groove 27. Therefore, it is possible to obtain the sprocket 1 that is easy to manufacture and lightweight.

Next, the sludge scraper 50 using the sprocket 1 will be described. FIG. 6 is a view showing the sludge scraper 50. The sludge scraper 50 is installed in a sedimentation basin 51 and mainly includes a driving sprocket 61, a driven sprocket 63, a chain 57, a flight 59, and the like. The chains 57 are respectively provided in the vicinity of both side walls in the width direction of the sedimentation basin 51 (the depth direction in FIG. 6). That is, a total of two sets of the chain 57, the drive sprocket 61, and the driven sprocket 63 shown in FIG. 6 are provided near both side walls in the width direction of the settling basin 51.

The drive sprocket 61 is rotationally driven by a motor (not shown). The driven sprocket 63 is freely rotatable. A chain 57 is stretched between the drive sprocket 61 and the driven sprocket 63. The chain 57 is provided with a plurality of long plate-like flights 59 at regular intervals by an attachment (not shown). The flight 59 is a plate-like member having substantially the same length as the width of the sedimentation basin 51, and a pair of chains 57 provided in the width direction of the sedimentation basin 51 are connected so as to extend over the entire length of the sedimentation basin 51 in the width direction. Provided.

The driving sprocket 61 and the driven sprocket 63 are arranged in the settling basin 51 so that the flight 59 provided on the chain 57 can move along the bottom of the settling basin 51. As it moves, it circulates around the drive sprocket 61 and the driven sprocket 63.

When the driving sprocket 61 is driven to rotate in the direction of arrow C by a motor (not shown), the chain 57 that meshes with the driving sprocket 61 moves between the driving sprocket 61 and the driven sprocket 63 in the direction of arrow D according to the rotation of the driving sprocket 61. . As the chain 57 moves, the flight 59 also rotates in the settling basin 51. The flight 59 that moves along the bottom of the settling basin 51 draws sludge and the like that has settled on the bottom of the settling basin 51. A pit 55 is provided at the end of the sedimentation basin 51, and sludge collected by the flight 59 is discarded in the pit 55.

FIG. 7 is an enlarged view of a portion E in FIG. The sprocket 1 according to the embodiment of the present invention is used for the drive sprocket of the sludge squeezer 50. As described above, the driving sprocket 61 (hereinafter referred to as “sprocket 1”) is given a rotational force by a motor (not shown).

When the shaft 33 connected to the motor rotates, the rotational force is transmitted to the sprocket 1 by the key 29 fitted in the key groove 31 provided in the shaft 33 and the key groove 27 provided in the plate 9 of the sprocket 1. The sprocket 1 rotates in the direction of arrow F.

A chain 57 is hung on the outer periphery of the sprocket 1, and the bush 73 of the chain 57 and the teeth 5 of the drive sprocket 61 are engaged with each other. When the sprocket 1 rotates in the direction of arrow F, a driving force is transmitted from the tooth 5 to the chain 57 that meshes with the tooth 5.

That is, since the sprocket 1 used for the drive sprocket 61 needs to transmit the rotational force of the shaft 33 to the chain 57, when the chain 57 is driven, particularly near the key groove 27 to which the rotational force is transmitted from the shaft 33. Great power is applied. Further, the key groove 27 is likely to be worn by contact with the key 29. Therefore, high strength is required in the vicinity of the key groove 27 of the sprocket 1 used as the drive sprocket 61. Since the sprocket 1 is provided with the key groove 27 on the high-strength plate 9, the sprocket 1 is not damaged near the key groove 27, has excellent wear resistance, and is suitable as the drive sprocket 61. The driven sprocket 63 only meshes with the chain 57 and freely rotates, and does not give a driving force to the chain 57. Therefore, a normal sprocket without the plate 9 can be used.

In addition, since the sludge scraper 50 is used in the sedimentation basin 51, the parts other than the drive sprocket 61 constituting the sludge scraper 50 are made of a material having corrosion resistance. For example, for the driven sprocket 63 and the chain 57, in consideration of the corrosion resistance, a part having corrosion resistance such as resin is used. For example, polyacetal, nylon, or ultrahigh molecular polyethylene having excellent corrosion resistance and workability can be used.

Thus, according to the sludge scraper 50 according to the present embodiment, the sprocket 1 is used as the drive sprocket 61, and the key groove 27 to which a force is particularly applied when driving the chain 57 is formed on the high-strength plate 9. Since the drive sprocket 61 is not damaged during operation, the sludge scraper 50 with less wear can be obtained. Further, if the meshing portion of the drive sprocket 61 and the driven sprocket 63 with the chain 57 and the chain 57 are both made of resin, slippage is good when the chain 57 is engaged with the drive sprocket 61 and the driven sprocket 63. There is little loss of time.

Next, a second embodiment will be described. FIG. 8 is a perspective view showing a sprocket 40 according to the second embodiment. FIG. 9A is a front view of the sprocket 40, and FIG. 9B is a sectional view taken along line BB in FIG. 9A. is there. In the following embodiments, components having the same functions as those of the sprocket 1 shown in FIGS. 1 to 5 are denoted by the same reference numerals as in FIGS. 1 to 5, and redundant description is avoided.

The sprocket 40 is mainly composed of a sprocket body 3, a boss 7, a plate 9, and the like, and has the same configuration as the sprocket 1. However, a plate installation portion 19 is provided outside the boss 7, and the plate 9 is located outside the sprocket 40. And the sprocket 1 is different from the sprocket 1 in that the boss 7 and the sprocket body 3 are sandwiched.

As shown in FIG. 9B, a convex portion 20 is provided on one end face of the boss 7 and is fitted into the boss hole 11 of the sprocket body 3. On the other end face of the boss 7, a plate installation portion 19 on which the plate 9 can be installed is provided. The width and thickness of the plate installation part 19 are substantially the same as those of the plate 9, and the depth direction of the plate installation part 19 is provided up to the vicinity of the shaft hole 15.

The sprocket body 3 is sandwiched between the bosses 7, and a plate 9 installed in the plate installation unit 19 is provided so as to sandwich the boss 7 and the sprocket body 3. The pair of plates 9 that sandwich the sprocket body 3 and the boss 7 are provided at the same position with the sprocket body 3 interposed therebetween. The boss 7, the plate 9 and the sprocket body 3 are joined by a bolt 23 and a nut 25.

A key groove 27 is provided in the plate 9. The key groove 27 is a groove having a rectangular cross section provided so as to extend from the shaft hole 15 to the plate 9, and is provided through the plate 9 and the boss 7. The key groove 27 may be processed after assembling the sprocket body 3, the boss 7, and the plate 9, or the plate 9 provided with the key groove 27 in advance may be assembled. In the latter case, when the sprocket 40 is assembled, it is necessary to install the plate 9 so that the key groove 27 provided in the plate 9 is at the same position with the sprocket body 3 interposed therebetween.

FIG. 10 is a front view showing a state where the shaft 33 and the key 29 are provided on the sprocket 40. As shown in FIG. 10, the sprocket 40 has a shaft 33 having a key groove 31 inserted in the shaft hole 15. A key 29 is provided in the key groove 27 and the key groove 31. Therefore, when the shaft 33 rotates, the shaft 33 and the sprocket 40 do not rotate and slide, and the sprocket 40 rotates as the shaft 33 rotates.

Thus, according to the sprocket 40 concerning 2nd Embodiment, there exists an effect similar to the sprocket 1. FIG. In addition, since the plate 9 is disposed outside the sprocket 40 and is not sandwiched between the boss 7 and the sprocket body 3, even if the thickness of the plate 9 is smaller than the thickness of the plate installation portion 19, the plate 9 is secured to the bolt 23. The plate 9 does not rattle, so that the processing accuracy of the thickness of the plate 9 and the plate installation portion 19 is not required, and the sprocket 40 can be easily replaced.

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.

The block diagram of the sprocket 1 which concerns on 1st Embodiment. The assembly drawing of the sprocket 1. It is a figure which shows the sprocket 1, (a) is a front view, (b) is AA sectional drawing of (a). It is a figure which shows the state by which the keyway 27 was provided in the sprocket 1. FIG. (A) is a front view, (b) is AA sectional drawing of (a). The figure which shows the state by which the shaft 33 and the key 29 were provided in the sprocket 1. FIG. The figure which shows the sludge collecting machine 50. FIG. It is a figure which shows the drive sprocket 61, and is the E section enlarged view of FIG. The perspective view which shows the sprocket 40 concerning 2nd Embodiment. It is a figure which shows the sprocket 40, (a) is a front view, (b) is the B section of (a). The figure which shows the state in which the shaft 33 and the key 29 were provided in the sprocket 40. FIG. Sectional drawing.

Explanation of symbols

1, 40 ......... Sprocket 3 ......... Sprocket body 5 ......... Tooth 7 ......... Boss 9 ......... Plate 11 ......... Boss hole 13 ......... Bolt hole 15 ......... Shaft hole 17 ......... Bolt hole 19 ......... Plate installation part 20 ..... Projection 21 ..... Bolt hole 23 ........... Bolt 25 ..... Nuts 27 ........... Key groove 29 ..... Key 31 ..... Key groove 33 ... …… Shaft 50 ……… Sludge squeezer 51 ……… Sedimentation basin 53 ……… Sludge 55 ……… Pit 57 ……… Chain 59 ……… Flight 61 ……… Drive sprocket 63 ……… Drive sprocket 65… ...... Connecting part

Claims (6)

A body member;
A sprocket comprising a pair of bosses having shaft holes,
The main body member and / or the boss is made of a resin made of any of polyacetal, nylon, and ultrahigh molecular weight polyethylene,
On the upper surface of the boss, a plate installation part is provided at a depth up to the vicinity of the shaft hole, and a stainless steel plate provided with a keyway is installed in the plate installation part,
The sprocket characterized in that the main body member and the pair of plates are sandwiched between a pair of the bosses, and the plates are at the same position on both sides of the main body. The sprocket according to claim 1, wherein bolt positions of the main body member, the pair of bosses, and the plate are the same, and the bolt penetrates the pair of the boss, the plate, and the main body member. The sprocket according to any one of claims 1 and 2, wherein the boss portion is provided with a convex portion that fits into a boss hole of the main body member. The sprocket according to any one of claims 1 to 3, wherein the width and thickness of the plate installation portion of the boss portion are substantially the same as the width and thickness of the plate. The sprocket according to any one of claims 1 to 4, wherein the plate installed in the plate installation part does not protrude from the circumference of the boss part. A drive sprocket driven by a motor;
A freely rotatable driven sprocket,
A chain spanning the drive sprocket and the driven sprocket;
A flight provided in the chain;
Comprising
The said drive sprocket is the sprocket in any one of Claims 1-5, The sludge scraping apparatus characterized by the above-mentioned.

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