JP2002294667A - Sprocket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem in a conventional sprocket 2 that, since a sprocket body 2A is provided with the complicated shapes of a gear tooth 2B, a guide projection 2C, and a ring-shaped projection 2D, and receives a large load, the sprocket body is integrally formed as a casting and, therefore, the sprocket 2 is not only very expensive but also requires a large scale operation in replacement operation to remarkably increase a replacement cost. SOLUTION: In this sprocket 10, an endless carrier chain 20 having a plurality of baskets (not shown) for dust collection connected thereto is applied to the outer periphery of the sprocket body 11, and a guide part to correct rolling is installed thereon. The sprocket 2 is formed as a liner 15 having a replaceable guide part, and the liner 15 is detachably installed on the sprocket body 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sprocket on which an endless link chain with a high load is hung, and more particularly, a traveling screen, a bar rotary screen provided at a seawater intake, water supply and sewage, etc. The present invention relates to a large sprocket suitably used as a drive mechanism of an automatic dust removing device such as a rake bar screen, a bucket type screen and the like.

[0002]

2. Description of the Related Art For example, a traveling screen is installed as an automatic dust removing device in an intake channel when a large amount of seawater is taken as cooling water at a nuclear power plant, a thermal power plant, or the like. As shown in FIG. 2, the traveling screen includes a lower sprocket 1 immersed in water in an intake channel and an upper sprocket 2 paired with the lower sprocket 1 and disposed above the water surface. An endless link chain (hereinafter referred to as a “carrier chain”) 3 wound between the two sprockets 1 and 2 and a plurality of filters attached to each link of the carrier chain 3 at equal intervals. And a basket 5. A motor 7 is connected to the upper sprocket 2 via an endless drive chain 6, and when the motor 7 is driven, the basket 5 catches dust in the intake channel and rises in the direction of the arrow in FIG. The dust in the basket 5 naturally falls when it is turned over at 2 and is collected in the dust trough 9 via the fixed chute 8. At this time, a large load is applied to the upper and lower sprockets 1 and 2.

FIG. 3 is an enlarged view showing the relationship between an upper sprocket (hereinafter simply referred to as “sprocket”) 2 and a carrier chain 3. As shown in the figure, the sprocket 2 has a predetermined number of teeth 2B formed at equal intervals on the outer periphery of a sprocket body 2A. The carrier chain 3 includes a plurality of link pairs 3A, a plurality of pins 3B for connecting the front and rear link pairs 3A endlessly, and a plurality of these pins 3B.
And a roller 3C rotatably mounted on each of the rollers. This carrier chain 3 is composed of upper and lower sprockets 2.
, And the roller 3C and the teeth 2B mesh with each other.
As shown in FIG. 4A, the teeth 2B are fitted between the link pairs 3A. When the sprocket 2 rotates in this state, the carrier chain 3 slightly swings left and right with respect to the teeth 2B. Therefore, in order to correct the roll of the carrier chain 3, as shown in FIGS. 4 (a) and 4 (b), streak-like guide projections 2C, 2C are formed in the front and rear sides of both sides of the tooth 2B in the radial direction. The guide projections 2C and 2C correct the lateral swing of the carrier chain 3 so that the carrier chain 3 rotates on a stable orbit. As shown in FIGS. 4A and 4B, these guide protrusions 2C extend substantially radially from reinforcing rings 2D formed on both side surfaces of the sprocket main body 2A. As described above, the sprocket 2 has a complicated form having the teeth 2B, the guide projections 2C, the ring-shaped projections 2D, and the like on the sprocket body 2A, and is subjected to a high load. Therefore, the sprocket 2 is formed of a cast article so as to withstand a high load. ing.

[0004] During operation of the traveling screen, the carrier chain 3 rotates smoothly without rolling over a predetermined track via the guide projection 2C of the sprocket 2. However, since the guide projection 2C constantly repeats sliding contact with the link pair 3A of the carrier chain 3 in order to correct the roll, aging wear cannot be avoided. When the worn portion of the guide projection 2C shown in FIG. 4A wears over time, the narrow gap between the guide projections 2C, 2C and the link pair 3A increases, so that the horizontal swing of the carrier chain 3 increases, and the traveling screen becomes larger. There is a risk of causing various adverse effects on the operation of the vehicle. Therefore, conventionally, if the guide projection 2C is worn, the sprocket 2 is replaced at an appropriate time.

[0005]

However, when replacing a large sprocket 2 used as a drive mechanism of an automatic dust removing device, it is not necessary to simply replace the sprocket 2, but to replace the sprocket 2 with the carrier chain 3 or the like. Since the replacement work is large-scale with the accompanying work such as the removal of the basket, there has been a problem that the replacement work cost becomes extremely high. Moreover, the sprocket 2 is expensive because only a part of the sprocket 2 is worn.
There is a problem that the cost is further increased because the whole is replaced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a portion for correcting the lateral sway of an endless link chain is replaceable so that a sprocket main body can be used repeatedly. It is an object of the present invention to provide a sprocket that can significantly reduce costs and replacement costs.

[0007]

According to a first aspect of the present invention, there is provided a sprocket according to the first aspect of the present invention, wherein a high-load endless link chain is wound around a sprocket main body, and the endless link chain is provided between the link pairs of the endless link chain. In the sprocket for correcting the roll by the fitted guide portion, the guide portion is configured as a replaceable liner, and the liner is detachably attached to the sprocket body.

[0008] The sprocket according to the second aspect of the present invention is arranged such that the endless link chain in which a basket for capturing dust is connected around the entire circumference is wound around the sprocket body. A sprocket that corrects roll by a guide portion fitted between the pair of links, wherein the guide portion is configured as a replaceable liner, and the liner is detachably attached to the sprocket body. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in FIG. FIG. 1 is a view showing a main part of an embodiment of a sprocket according to the present invention, (a) is a side view thereof, and (b) is a sectional view taken along the line BB of (a).

As shown in FIGS. 1 (a) and 1 (b), a sprocket 10 of the present embodiment has a substantially circular sprocket body 11 and an outer peripheral surface of the sprocket body 11 which is circumferentially formed. A meshing portion 12 formed by indenting radially inward at an interval, and a through hole 14 provided at the center in the circumferential direction of the outer peripheral edge 13 of the sprocket body 11 between the adjacent meshing portions 12 and 12 ( FIG. 1B), a pair of liners 15, 15 attached to the through hole 14 from both sides of the sprocket body 11, and a fastening member 16 for fastening the two 15, 15 to the sprocket body 11. ing. The sprocket 10 is used, for example, as a driving mechanism of a traveling screen, and an endless carrier chain (hereinafter, simply referred to as a “carrier chain”) 20 is wound around a pair of sprockets 10 and 10 arranged vertically. . The sprocket main body 11 is different from a conventional casting, and can be formed of, for example, a thick steel plate.

The meshing portion 12 is covered with a contact plate (insert) 17 which is curved in accordance with its shape. That is, bolt holes 12A and 17A are formed at both ends in the circumferential direction of the engagement portion 12 and the insert 17, respectively. Further, oblong mounting holes 12B, 12B are formed between the meshing portions 12, 12, ie, at both ends in the circumferential direction of the outer peripheral edge portion 13, in a substantially C-shape. The bolt hole 12A of the engagement portion 12 penetrates from the engagement portion 12 to the mounting hole 12B. Then, a bolt (not shown) is inserted into the bolt holes 17A, 12A, and a nut (not shown) is screwed into a screw portion protruding into the mounting hole 12B, thereby fastening the insert 17 to the meshing portion 12. It is. It goes without saying that the bolt head is housed in the bolt hole of the insert 17.

Further, the liner 15 is formed as shown in FIG.
As shown in FIG. 5, a straight body 15A fitted into the through hole 14 between the meshing parts 12, 12 and a head 15C having a flange 15B formed at one end of the straight body 15A are provided. Are engaged with an engagement step 13A formed along the outer periphery of the through hole 14. A tapered surface 15D is formed at the periphery of the head 15C, and a bolt hole 1 is formed at the center thereof.
5E is formed. The bolt hole 15E has a small diameter portion through which the shaft portion of the bolt 16A constituting the fastening member 16 penetrates, and a large diameter portion in which the head is accommodated. And the through hole 1
4, a pair of liners 15, 15 are mounted from both sides thereof. A bolt 15 </ b> A is inserted into a bolt hole 15 </ b> E from one of the left and right liners 15 (the left side in FIG. 1B), and the other liner 15 side. A nut 16B is screwed into a bolt 16A protruding from the bolt hole 15E, and the pair of liners 15, 15 is fixed to the through hole 14. In this state, the pair of liners 15, 15 is engaged with the engagement step portions 13A, 13A on the outer periphery of the through hole 14 by the flange portions 15B, 15B.
Accordingly, the heads 15C of the pair of liners 15, 15 are fixed to the through-holes 14, and each head 15C protrudes from both surfaces of the outer peripheral edge 13, and the carrier 15C, 15C protrudes from both sides of the outer peripheral edge 13. Straightening of the chain 20 is corrected. That is, since the head 15C of the liner 15 is a guide for correcting the trajectory of the carrier chain 20,
Hereinafter, the head of the liner 15 is referred to as a guide portion 15C.
Further, the tapered surface 15D formed on the outer peripheral edge of the guide portion 15C has a sprocket 10
It is a guide surface when meshing.

On the other hand, the carrier chain 20 is shown in FIG.
(A), a plurality of link pairs 21, a pin 22 for connecting adjacent link pairs 21 and 21, and a pin 2
2 and a roller 23 rotatably mounted and sandwiched between link pairs 21. When the carrier chain 20 is wound around the sprocket 10 as shown in FIG.
The roller 23 of the carrier chain 20 is
And the outer peripheral edge 13 of the sprocket body 11 is fitted between the link pairs 21. FIG. 4B shows a cross section in this state. As shown in this drawing, guide portions 15C, 15 of a pair of liners 15, 15 attached to a link pair 21 and a through hole 14 of an outer peripheral edge portion 13.
A slight gap is formed between C.

Next, the operation will be described. When the sprocket 10 rotates during the operation of the traveling screen,
The engagement portion 12 of the sprocket 10 and the carrier chain 20
Of the sprocket main body 11 is fitted between the link pairs 21. Also,
The meshing portion 12 and the roller 23 that have already meshed are sequentially separated, and the outer peripheral edge portion 13 is separated from between the link pairs 21. When the carrier chain 20 meshes with the sprocket 10 in this manner, the roll of the carrier chain 20 is corrected by the liner 15 (more precisely, the guide portion 15C) of the sprocket 10, and the carrier chain 20 rotates smoothly along the track without almost rolling. A plurality of baskets (not shown) sequentially sink into the seawater or water and catch and remove dust as they float.

However, when the traveling screen has been operated for a long period of time, when the roll of the carrier chain 20 is corrected by the liner 15 of the sprocket 10,
The guide portion 15C of the liner 15 slides on the link pair 21, and the guide portion 15C of the liner 15 wears over time,
Eventually, if the carrier chain 20 rolls and the guide portion 15C further wears, there is a possibility that the operation of the traveling screen may be impaired. In such a case, in the case of a conventional sprocket, it was necessary to replace the sprocket itself. However, in this embodiment, the roll of the carrier chain 20 can be corrected only by replacing the liner 15. Therefore, although the operation of the traveling screen must be interrupted, the sprocket main body 11 is left intact without being removed, and is restored to the original sprocket 10 in which the roll can be corrected only by replacing the liner 15. Can be. Therefore, the sprocket main body 11 can be continuously used as it is, and a large-scale on-site replacement work for restoring the sprocket 10 becomes unnecessary. Even if the sprocket main body 11 is damaged and needs to be replaced, the sprocket main body 11 can be manufactured from a thick plate steel plate instead of a conventional cast article. Can be.

As described above, according to the present embodiment,
The guide portion for correcting the roll of the carrier chain 20 is configured as a replaceable liner 15 and the liner 15 is detachably attached to the outer peripheral edge 13 of the sprocket body 11, so that even if the liner 15 is worn, The sprocket 10 can be restored to the original state only by the replacement operation of 15 to correct the roll of the carrier chain 20. Therefore, the sprocket body 11 can be continuously used as it is, so that both the component cost and the operation cost can be remarkably reduced as compared with the related art.

It should be noted that the present invention is not limited to the above-described embodiment at all. The present invention is applicable to any sprocket provided that the guide portion for correcting the lateral movement of the link chain is configured to be detachable with a liner. Included.

[0018]

According to the first and second aspects of the present invention, the portion for correcting the lateral movement of the link chain is replaceable so that the sprocket body can be used repeatedly. It is possible to provide a sprocket that can significantly reduce the manufacturing cost and replacement cost thereof.

[Brief description of the drawings]

FIG. 1 is a view showing a main part of an embodiment of a sprocket according to the present invention, (a) is a side view thereof, and (b) is BB of (a).
It is sectional drawing of a line direction.

FIG. 2 is a side view conceptually showing a traveling screen to which a conventional sprocket is applied.

FIG. 3 is a side view showing the upper sprocket shown in FIG. 2;

4A and 4B are diagrams showing a relationship between an upper sprocket and a carrier chain shown in FIG. 2, wherein FIG. 4A is a side view showing an enlarged main part, and FIG. 4B is a cross-sectional view taken along line BB of FIG. It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Sprocket 11 Sprocket main body 15 Liner 15C Head (guide part) 20 Carrier chain (endless link chain)

Claims (2)

[Claims] 1. A sprocket in which a guide portion fitted between a pair of links of the endless link chain corrects the roll in a state where the endless link chain with a high load is hung around the sprocket body. Characterized in that the sprocket is configured as a replaceable liner and the liner is detachably attached to the sprocket body. 2. An endless link chain in which a garbage trapping basket is connected around the entire circumference of the endless link chain, and is swayed by a guide portion fitted between a pair of links of the endless link chain. A sprocket for correcting the above problem, wherein the guide portion is configured as a replaceable liner, and the liner is detachably attached to the sprocket body.