JP7009683B2 - Chain, chain inspection method - Google Patents

Description

The present invention relates to a chain and a method for inspecting the amount of elongation thereof.

Conventionally, in various machines, chains are used to transmit power. As a structure of the chain, for example, a pin and a bush are arranged between the plates, and the adjacent plates rotate by the relative rotation of the pin and the bush. Such a chain is, for example, hung on a plurality of sprocket wheels and moved by the rotation of the sprocket. That is, in the sprocket, the chain is bent, and the chain is in a straight state between the sprockets.

In this way, the chain repeats bending and stretching due to sliding between the pin and the bush, so that friction of the sliding portion progresses. At this time, since a predetermined tension is applied to the chain, when the contact surface between the pin and the bush is worn, the entire chain is in a stretched state. If the chain is stretched more than a predetermined value, there is a risk of operation trouble or breakage.

Therefore, it is necessary to lubricate the sliding surface between the pin and the bush to reduce the amount of wear. For example, there is a method of providing a groove on the outer peripheral surface of the pin and holding the lubricating oil in the groove. (Patent Document 1).

Utility Model Registration No. 3126970 Gazette

However, even with sufficient lubrication, wear cannot be completely suppressed. Therefore, it is necessary to control the amount of chain elongation. However, it is difficult to measure the elongation of the chain for each connecting part. Therefore, there is a demand for a method capable of easily grasping the elongation of the chain.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a chain or the like whose elongation can be easily grasped.

In order to achieve the above-mentioned object, the first invention is an outer plate which is a chain in which a plurality of plates are connected, which is arranged on the outside in the connecting portion between the plates and has a pin fitting hole near the end portion. An inner plate that is arranged inside the outer plate and is provided with a bush fitting hole at a portion corresponding to the pin fitting hole, a bush that fits in the bush fitting hole, and the bush that penetrates the bush. A pin, which is fixed to the pin fitting hole of the outer plate, is provided, and a mark capable of grasping the elongation of the chain is provided at a portion of the inner plate that overlaps with the outer plate . When the chain is not stretched, the mark is covered with the end portion of the outer plate, the mark cannot be visually recognized from the outside of the outer plate, and when the chain is stretched by a predetermined amount, the stretch amount is increased. The chain is characterized in that a part of the mark is exposed .

The mark may be a hole penetrating the inner plate.
The second invention is a chain in which a plurality of plates are connected, and is an outer plate which is arranged on the outside in the connecting portion between the plates and has a pin fitting hole in the vicinity of the end portion, and the outer plate. An inner plate that is arranged inside the pin and is provided with a bush fitting hole at a portion corresponding to the pin fitting hole, a bush that fits into the bush fitting hole, and a bush that penetrates the bush and is said to be the outer plate. A state in which a through hole capable of grasping the elongation of the chain is provided at a portion of the outer plate that overlaps with the inner plate, and the chain is not extended. Then, the through hole overlaps with the inner plate, the through hole is closed by the inner plate, and when the chain is extended by a predetermined amount, a part of the through hole is formed of the inner plate according to the extension amount. The chain is characterized in that a part of the through hole is separated from the tip and communicates with the space inside the outer plate.

According to the first or second invention, when there is no elongation, the outer plate and the inner plate overlap each other, so that the mark cannot be seen from the outside or the through hole is closed , but when the chain is extended, the outer plate is formed. Since the positional relationship between the mark or the inner plate and the through hole changes, the elongation of the chain can be easily grasped from the outside.

In particular, if the mark is a through hole, the exposure amount of the through hole can be easily grasped by inserting a gauge or the like into the through hole, so that the elongation amount of the chain can be easily grasped for each connecting portion. You can inspect the chain.

A third aspect of the invention is the method for inspecting the elongation of a chain according to the first aspect of the present invention, wherein the mark is exposed from the end of the outer plate while tension is applied to the chain. It is a chain inspection method characterized by grasping the elongation of the chain.

A fourth aspect of the invention is the method for inspecting the elongation of a chain according to the first aspect of the present invention, wherein the mark is exposed from the end of the outer plate while tension is applied to the chain. It is a chain inspection method characterized in that the elongation of the chain is grasped and the exposed amount of the mark is grasped by inserting a gauge into the hole of the mark exposed from the end portion of the outer plate.
A fifth aspect of the present invention is the method for inspecting the elongation of a chain according to the second invention, in which the chain is separated from the tip of the inner plate and communicates with the space inside the outer plate in a state where tension is applied to the chain. This is a chain inspection method, characterized in that the elongation of the chain is grasped from the amount of communication of the through hole.
By inserting a gauge into the through hole that deviates from the end of the inner plate and communicates with the space inside the outer plate, the amount of communication of the through hole may be grasped.

According to any one of the third to fifth inventions, the extension amount of each connecting portion of the chain can be easily inspected by the mark or the through hole .

In particular, when the mark is a through hole, the extension amount of the chain can be easily grasped and the chain can be inspected by inserting a gauge or the like into the through hole.

According to the present invention, there is provided a chain or the like whose elongation can be easily grasped.

The perspective view which shows the chain 1. It is a side view of the chain 1, (a) is the figure which shows the state which the chain 1 is not extended, and (b) is the figure which shows the state which the chain 1 is extended. (A) is an enlarged cross-sectional view taken along line AA of FIG. 2 (a), and (b) and (c) are enlarged views taken along line BB of FIG. 2 (b). The perspective view which shows the chain 1a. (A) to (c) are diagrams showing the relationship between the elongation of the chain and the mark 13 in other embodiments.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the chain 1 according to the present embodiment. The chain 1 is mainly composed of a plate 3, a pin 5, a bush 7, and the like. Note that FIG. 1 is a perspective view of a part of the outer plate 4.

The plate 3 is a plate-shaped member, and is composed of an outer plate 4 and an inner plate 6. The pair of outer plates 4 and the pair of inner plates 6 are arranged alternately. Pin fitting holes 9 are provided near both ends of the outer plate 4. Further, bush fitting holes 11 are provided near both ends of the inner plate 6.

At the connecting portion between the outer plate 4 and the inner plate 6, a pair of inner plates 6 are arranged so as to face each other. A cylindrical bush 7 having a through hole is fitted in the bush fitting hole 11. Further, the pair of outer plates 4 are arranged on the outer side of the inner plate 6, and the pin 5 penetrating the bush 7 is fitted into the pin fitting hole 9 at the position corresponding to the bush fitting hole 11. That is, the pair of outer plates 4 and the pair of inner plates 6 are connected to each other by the pins 5 in the vicinity of both ends thereof. In this way, in the chain 1, the outer plate 4 and the inner plate 6 are rotatably connected around the pin 5. A roller may be further provided on the outer periphery of the bush 7.

The vicinity of both ends of the inner plate 6 overlaps with the vicinity of both ends of the outer plate 4, and is covered from the outside of the vicinity of both ends of the inner plate 6 to the vicinity of both ends of the outer plate 4. Marks 13 are formed in the vicinity of both ends of the inner plate 6 of the portion covered by the outer plate 4. The mark 13 is, for example, a hole penetrating the inner plate 6. The mark 13 is arranged on the center side (opposite to the tip) with respect to each bush fitting hole 11 near both ends of the inner plate 6.

2A is a side view of the chain 1, a perspective view of the outer plate 4, and FIG. 3A is an enlarged cross-sectional view taken along the line AA of FIG. 2A. The states shown in FIGS. 2A and 3A are states in which the pins 5 and the bush 7 are not worn. That is, the chain 1 is not extended. In this state, the mark 13 is covered with the end of the outer plate 4. Therefore, the mark 13 cannot be visually recognized from the outside of the outer plate 4.

On the other hand, FIG. 2B is a side view showing a state in which a part of the pin 5 and the bush 7 is worn, and FIG. 3B is an enlarged cross-sectional view taken along the line BB of FIG. 2B. Is. When the sliding portions of the pin 5 and the bush 7 are worn, the tension applied to the chain 1 causes the chain 1 to be in an stretched state. That is, the overlapping portion between the inner plate 6 and the outer plate 4 is reduced.

In this way, when the outer plate 4 is displaced to both sides with respect to the inner plate 6, the mark 13 arranged at the overlapping portion between the inner plate 6 and the outer plate 4 is exposed from the end portion of the outer plate 4. do. That is, the mark 13 can be visually recognized from the outside of the outer plate 4. Therefore, it is possible to easily grasp that the chain 1 has been extended.

As shown in FIG. 3B, when the chain 1 is stretched by a predetermined amount, a part of the mark 13 is exposed according to the stretched amount. By measuring this amount of exposure, the amount of elongation at the connecting portion can be grasped more accurately. For example, in the state shown in FIG. 3B, if a thin gauge 15a is inserted and the gauge 15a can be inserted, it can be grasped that the elongation amount of the chain 1 is equal to or more than a predetermined amount.

Further, as the wear of the pin 5 and the bush 7 progresses, the exposed portion of the mark 13 becomes larger as shown in FIG. 3 (c). Therefore, a thicker gauge 15b can be inserted. For example, when the chain 1 is extended enough to insert the gauge 15b, the chain 1 can be replaced to determine the replacement time of the chain 1. That is, the soundness of the chain 1 can be inspected by inserting it into the mark 13 using gauges 15a, 15b and the like.

As described above, according to the present embodiment, the mark 13 is formed in the vicinity of both ends of the inner plate 6 and in the overlapping portion with the outer plate 4. Therefore, in the normal state, the mark 13 cannot be visually recognized because it is covered with the outer plate 4. On the other hand, when the chain 1 is extended, the mark 13 is exposed from the end of the outer plate 4, so that the extension of the chain 1 can be easily grasped.

At this time, since the amount of elongation can be grasped for each connecting portion of the chain 1, local elongation can also be detected. For example, if wear progresses abnormally only on a part of the connecting portion of the chain 1, even if the amount of elongation of the chain 1 as a whole is small, the portion may be stretched more than a predetermined value. .. In the present embodiment, since the elongation can be grasped for each connecting portion, even if there is local abnormal wear, it can be easily detected.

Further, by measuring the exposure amount of the mark 13 by inserting the gauges 15a and 15b into the holes, it is possible to easily accurately grasp the elongation amount of the chain 1 and inspect the soundness of the chain 1.

The chain 1 of the present invention is not limited to the example shown in FIG. 1 and the like. For example, it can be applied to the chain 1a shown in FIG. The chain 1a is a so-called offset type chain. A plurality of plates 3a are connected to the chain 1a. The plate 3a is a plate-shaped member, and has an outer plate portion 4a and an inner plate portion 6a.

One end of the plate 3a becomes the outer plate portion 4a, and the other end becomes the inner plate portion 6a. The outer plate portion 4a is provided with a pin fitting hole 9. The inner plate portion 6a is provided with a bush fitting hole 11. A step is provided between the outer plate portion 4a and the inner plate portion 6a. The outer plate portion 4a and the inner plate portion 6a are not flush with each other due to the step, but the outer plate portion 4a and the inner plate portion 6a are substantially parallel surfaces.

In the pair of plates 3a, the outer plate portions 4a are arranged so as to spread outward from each other, and the inner plate portions 6a of the similarly arranged pair of adjacent plates 3a are arranged inside the outer plate portions 4a. Placed in. That is, the vicinity of the end portion of the inner plate portion 6a is covered from the outside by the outer plate portion 4a.

Further, as described above, a bush 7 having a through hole inside is provided inside the inner plate portion 6a, and is fitted into each bush fitting hole 11 of the inner plate portion 6a. Further, the pin fitting hole 9 and the bush 7 of the outer plate portion 4a are provided in a substantially linear shape, and the pin 5 is inserted into and fixed to the pin fitting hole 9. In this way, the chain 1a is rotatably connected to the outer plate portion 4a and the inner plate portion 6a around the pin 5.

As described above, in the chain 1a, the plate 3a has the same configuration as the one in which one outer plate 4 and one inner plate 6 of the chain 1 are integrally configured. Therefore, the outer plate in the present invention includes the outer plate portion 4a in the chain 1a, and the inner plate in the present invention includes the inner plate portion 6a. That is, even in the connecting portion between the plates 3a of the chain 1a, the outer plates are arranged outside the inner plates and overlap each other.

A mark 13 is formed near the end of the inner plate portion 6a and on the center side (outer plate portion 4a side) of the bush fitting hole 11. As described above, since the mark 13 is covered by the outer plate portion 4a, it cannot be visually recognized from the outside.

On the other hand, also in the chain 1a, when the pins 5 and the bush 7 are worn and the chain 1a is stretched, the mark 13 is exposed from the tip of the outer plate portion 4a. Therefore, the elongation of the chain 1a can be grasped by the degree of exposure of the mark 13. Further, the chain 1a can be easily inspected by the gauges 15a, 15b and the like. In this way, also in the offset type chain 1a, by forming the mark 13 on the inner plate of the portion covered with the outer plate, as in the chain 1, when the pin 5 and the bush 7 are worn out, the outer plate is formed. The mark 13 can be exposed from the end of the plate.

Further, the mark 13 does not have to be a through hole. For example, it may be a recess that does not completely penetrate or is partially thinned. In this case, a recess is formed at least on the outer surface side of the inner plate. As described above, the mark 13 may be visible from the outside even if it does not penetrate.

For example, the mark 13 may be a scribe line. For example, by forming a plurality of marking lines perpendicular to the longitudinal direction of the inner plate, the amount of elongation of the chain can be easily grasped.

Similarly, the mark 13 may be formed by a difference in color due to painting. For example, in order to improve corrosion resistance, when the chain is painted, the color of the portion covered by the outer plate on the outer surface side of the inner plate may be different from the color of the other portions. Similarly, the surface roughness may be changed by making the surface roughness of the portion covered by the outer plate on the outer surface side of the inner plate smaller than the surface roughness of the other portions.

Further, the gauge used for inspecting the chain may be a taper gauge. Further, since the mark 13 may be visible from at least one of the chains, it may not be formed on the inner plates on both sides facing each other, or may be formed only on one inner plate. Further, in the chain 1, marks 13 are formed in the vicinity of both ends of the inner plate 6, but only one of them may be formed.

Further, in the above description, the mark 13 is formed on the inner plate 6, but it may be formed on the outer plate 4. FIG. 5A is a cross-sectional view showing a state in which the mark 13 is formed on the outer plate 4. In this case, the mark 13 is limited to the through hole.

If the chain is not stretched, the mark 13 will completely overlap the inner plate 6. Therefore, the mark 13 is closed by the inner plate 6. When the chain extends from this state, as shown in FIG. 5B, a part of the mark 13 comes off from the tip of the inner plate 6, and a part of the mark 13 communicates with the space inside the outer plate 4. do. Therefore, for example, by inserting the gauge 15a, the amount of elongation can be grasped.

When the chain is further extended, as shown in FIG. 5C, the entire mark 13 is detached from the tip of the inner plate 6 and the entire mark 13 communicates with the space inside the outer plate 4. Therefore, for example, by inserting a gauge 15b thicker than the gauge 15a, it is possible to determine, for example, the replacement time. As described above, if the mark 13 capable of grasping the elongation of the chain is provided in the vicinity of the overlapping portion of at least one of the inner plate 6 or the outer plate 4, the elongation can be easily grasped. ..

Although the embodiments of the present invention have been described above with reference to the attached drawings, the technical scope of the present invention does not depend on the above-described embodiments. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1, 1a ………… Chain 3, 3a ………… Plate 4 ………… Outer plate 4a ………… Outer plate part 5 ………… Pin 6 ………… Inner plate 6a ………… Inner plate part 7 ………… Bush 9 ………… Pin fitting hole 11 ………… Bush fitting hole 13 ………… Marks 15a, 15b ………… Gauge

Claims (7)

A chain that connects multiple plates
At the connecting portion between the plates
An outer plate that is placed on the outside and has a pin fitting hole near the end,
An inner plate arranged inside the outer plate and provided with a bush fitting hole at a portion corresponding to the pin fitting hole, and an inner plate.
A bush that fits into the bush fitting hole and
A pin that penetrates the bush and is fixed to the pin fitting hole of the outer plate,
Equipped with
A mark on the inner plate that overlaps with the outer plate is provided so that the elongation of the chain can be grasped .
In the state where the chain is not extended, the mark is covered with the end portion of the outer plate, and the mark cannot be visually recognized from the outside of the outer plate.
A chain characterized in that when the chain is stretched by a predetermined amount, a part of the mark is exposed according to the stretched amount . The chain according to claim 1, wherein the mark is a hole penetrating the inner plate. A chain that connects multiple plates
At the connecting portion between the plates
An outer plate that is placed on the outside and has a pin fitting hole near the end,
An inner plate arranged inside the outer plate and provided with a bush fitting hole at a portion corresponding to the pin fitting hole, and an inner plate.
A bush that fits into the bush fitting hole and
A pin that penetrates the bush and is fixed to the pin fitting hole of the outer plate,
Equipped with
A through hole is provided in the outer plate at a portion overlapping the inner plate so that the elongation of the chain can be grasped .
In the state where the chain is not extended, the through hole overlaps with the inner plate, and the through hole is closed by the inner plate.
When the chain is stretched by a predetermined amount, a part of the through hole is disengaged from the tip of the inner plate according to the stretch amount, and a part of the through hole communicates with the space inside the outer plate. Chain to do. The method for inspecting chain elongation according to claim 1 or 2 .
A method for inspecting a chain, which comprises grasping the elongation of the chain from the exposure amount of the mark exposed from the end portion of the outer plate in a state where tension is applied to the chain. The method for inspecting chain elongation according to claim 2.
With tension applied to the chain, the elongation of the chain can be grasped from the exposure amount of the mark exposed from the end of the outer plate.
A method for inspecting a chain , which comprises inserting a gauge into a hole of the mark exposed from an end portion of the outer plate to grasp the exposure amount of the mark. The method for inspecting chain elongation according to claim 3.
It is characterized in that the elongation of the chain is grasped from the amount of communication of the through hole that deviates from the tip of the inner plate and communicates with the space inside the outer plate in a state where tension is applied to the chain. How to inspect the chain. 6 . _ _ _ _ The described chain inspection method.

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