JP2004020453A - Link chain inspection equipment - Google Patents

Abstract

An inspection device capable of easily and accurately detecting a deformed portion of a link chain without relying on visual observation.
The link chain has a cross-shaped groove corresponding to the cross section of the link chain, and at least one end of the cross-shaped groove is freely openable and closable so that the link chain can be inserted into the cross-shaped groove. An inspection device for a link chain, wherein the deformation of the link chain is inspected by being inserted along a cross groove.
[Selection diagram] Fig. 4

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inspection apparatus for easily and accurately inspecting a link chain for deformation such as bending or twisting.
[0002]
[Prior art]
Chains are widely used in civil engineering construction sites, harbor work sites, and transportation operations. For example, a link chain is generally used as a suspension chain for a suspension scaffold at a construction site. As shown in FIG. 8, a link chain is a chain in which elongated iron rings are engaged with each other to form a chain. For example, one horizontal ring has adjacent rings engaged vertically. Therefore, the cross-section of the entire chain has a cross-shaped cross-section as a whole as a result of the vertical cross-section and the horizontal cross-section appearing alternately along the longitudinal direction.
[0003]
When this link chain is deformed, the predetermined strength is lost, and the safety of work cannot be maintained. For this reason, safety regulations and the like require inspection of chain deformation.
Conventionally, the deformation of the chain has mainly relied on visual observation, which inevitably causes errors by the workers, and in addition, it is necessary to observe the deformation of each link in a long chain, so there are many oversights, There is a problem that reliability is low although it takes time.
[0004]
[Problems to be solved by the invention]
The present invention solves the problem of the conventional inspection of the deformation of the link chain by visual observation. SUMMARY OF THE INVENTION An object of the present invention is to provide an inspection apparatus capable of accurately and easily inspecting the deformation of a long chain over its entire length by a simple mechanical operation.
[0005]
[Means to solve the problem]
The present invention has the following configuration to achieve the above object.
That is, the basic configuration of the chain inspection apparatus according to the present invention has a cross-shaped groove (referred to as a cross groove) formed corresponding to the cross section of the link chain, and the cross is inserted so that the link chain can be inserted into the cross groove. At least one end of the groove is free to be released, and the inserted link chain is inserted along the cross groove to inspect the deformation of the link chain.
[0006]
In the above inspection device, when the link chain passes through the cross groove, the cross section of the cross groove corresponds to the cross section of the normal portion, so that the normal portion passes through the cross groove, but the deformed portion passes through the cross groove. The protruding part hits the surrounding wall and cannot pass through the cross groove, and the deformed part of the chain can be easily detected.
[0007]
The cross groove forming body can be formed by a block, a planar body, a frame plate, or a combination thereof, and may be configured by a single body or a plurality of divided bodies.
The specific first configuration example includes a lower groove forming body and an upper groove forming body that cooperate with each other to form a cross groove. A groove having a T-shaped cross section is formed through the upper surface of the lower groove forming body from the front end to the rear end. The upper groove forming body is formed from a pair of left and right groove forming bodies slidably mounted along the open upper surface of the T-shaped cross-sectional groove of the lower groove forming body so that the inner ends of each other maintain a predetermined gap. Become. A pair of left and right upper groove forming bodies is fixed to the T-shaped cross-sectional groove of the lower groove forming body, thereby forming a cross groove through which the link chain is inserted. Then, the deformation of the link chain is inspected by inserting the link chain along the cross groove.
[0008]
The upper and lower groove forming bodies can quickly and easily attach and detach the link chain by opening and closing the left and right upper groove forming bodies. When the chain is deformed, the deformed portion abuts the inner wall of the upper groove forming member or the lower groove forming member, so that the chain cannot pass through the cross groove, and the deformed portion can be easily detected. Further, a portion surrounding the T-shaped cross-sectional groove of the lower groove-formed body is detachably formed, and by replacing this portion, the groove width of the T-shaped cross-sectional groove and, accordingly, the inner ends of the left and right upper groove-formed bodies. If the facing gap width is changed, the present inspection apparatus can be applied to chains having different link wire diameters and diameters.
[0009]
A second specific configuration example of the device of the present invention has a fixed frame that can be divided into an upper frame and a lower frame. The upper frame and the lower frame each have a concave portion facing each other, and a pair of inner blocks are fixed to the concave portion with a space therebetween. A cross groove is formed by the interval between the inner blocks. Then, the deformation of the link chain is inspected by inserting the link chain along the cross groove.
[0010]
The inspection device including the splittable fixed frame and the inner block can quickly and easily attach and detach the link chain by opening and closing the fixed frame. Further, if the chain is deformed, the deformed portion abuts on the inner block, so that the deformed portion of the chain can be easily detected. In addition, this inspection device has a simple structure, so it can be reduced in weight, can be used as a portable device in addition to being used by attaching it to a work table, etc., and can be easily moved by moving the inspection device attached to the chain along the chain. A deformed portion can be detected. Furthermore, if the inner block is formed detachably and the inner block is replaced to adjust the groove width of the cross groove, as in the first configuration example, even for chains having different link wire diameters and diameters, The present inspection apparatus can be applied.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the inspection apparatus of the present invention will be specifically described with reference to the drawings.
The configuration shown in FIGS. 1 to 5 is an example of an inspection apparatus including a pedestal forming a lower groove forming body and a slidable fixed block forming an upper groove forming body.
As shown in the figure, the inspection apparatus 10 has a pedestal 11 and a pair of fixed blocks 12 and 13 provided on the upper surface of the pedestal 11. On the upper surface of the pedestal 11, a groove 14 is provided in the longitudinal direction. The groove 14 has a T-shaped cross section which is horizontal and perpendicular to the lower side. The upper groove height and the lower groove width correspond to the thickness of the link chain, and are formed to have a size that allows a normally shaped chain to be inserted. In the drawings, reference numeral 14a denotes a horizontal groove of the T-shaped cross-sectional groove 14, and 14b denotes a lower vertical groove 14b.
[0012]
The fixing blocks 12 and 13 on the pedestal upper surface are provided to face each other with the T-shaped cross-sectional groove 14 interposed therebetween. An elongated hole 15 is formed in the upper surface of each of the fixing blocks 12 and 13, and a bolt 16 is screwed to the pedestal 11 through the elongated hole 15. By loosening the bolt 16, the fixing blocks 12 and 13 can slide along the long hole 15. A guide plate 17 for guiding the sliding of the fixed blocks 12 and 13 is attached so as to protrude from a side end of the fixed blocks 12 and 13 to a side end of the pedestal.
[0013]
As shown in FIG. 1, when the bolts 16 are loosened and the fixing blocks 12 and 13 are slid outward from each other, the upper surface of the pedestal 11 is opened and the horizontal groove 14a of the T-shaped groove 14 is released. Become. On the other hand, as shown in FIG. 2, the fixed blocks 12, 13 are slid inward each other, and the inner ends of the fixed blocks 12, 13 are covered with the T-shaped cross-sectional groove 14, and the same interval as the groove width is set. By holding and fixing, the horizontal groove 14b is closed, and the upper vertical groove 12a communicating upward with the lower vertical groove 14b is formed, thereby forming a cross-shaped groove as a whole.
[0014]
The use state will be described.
As shown in FIG. 3, the fixing blocks 12 and 13 are slid outward to open the T-shaped cross-sectional groove 14, and the link chain 20 is inserted into the T-shaped cross-sectional groove 14 along the longitudinal direction.
The horizontal link 21 in the figure of the chain 20 is horizontally supported by the horizontal groove 14a of the T-shaped groove 14, while the vertical link 22 is inserted into the lower vertical groove 14b. In this state, when the fixing blocks 12 and 13 are slid inward to cover the inner end of the block with the upper end of the T-shaped cross-sectional groove 14 and fixed at intervals to form a cross groove, as shown in FIG. The chain 20 is sandwiched between the cross grooves.
[0015]
When the chain 20 is inserted along the cross groove in this state, a normal portion passes through the cross groove. However, if the chain is deformed, the deformed portion hits the pedestal or the fixed block, so that the normal portion may pass through the cross groove. No, the deformed portion can be easily detected.
Since the cross groove is open at the upper end, a link chain, particularly a chain chain having a hook at its end, such as a suspension chain for a construction site, can be inserted without any trouble.
[0016]
Further, in the above-described inspection apparatus, if the portion 18 surrounding the T-shaped cross-sectional groove 14 of the pedestal 11 is detachably formed, the groove width can be adjusted by replacing the portion 18, and the wire diameter (thickness) of the link can be adjusted. The present inspection apparatus can be applied to chains having different diameters or sizes.
[0017]
The configuration shown in FIGS. 6 and 7 is an example of a device having a fixed frame that can be divided and an inner block.
As shown in the figure, the present inspection apparatus has a fixed frame 30 that can be divided into an upper frame 31 and a lower frame 32, and the upper frame 31 and the lower frame 32 are formed with opposing concave portions. . In these recesses, a pair of inner blocks 33 to 36 are fixed to the upper frame 31 or the lower frame 32 with an interval therebetween.
[0018]
The upper frame 31 and the lower frame 32 are provided with flange portions 37 and 38 projecting outward, and screw holes 39 and 40 for connection are formed in the flange portions 37 and 38.
As shown in FIG. 7, when the bolts 41 are inserted through the screw holes 39 and 40 to integrally connect the upper frame 31 and the lower frame 32 to form the fixed frame 30, the inner block is provided inside the fixed frame 30. A cross groove is formed by the interval of. The width of the cross groove corresponds to the thickness of the chain, and is formed to have a size such that a normally shaped chain can be inserted. If the inner blocks 33 to 36 are detachably fixed by a method such as screwing, the groove width can be adjusted by replacing the inner blocks with different sizes.
[0019]
With the fixed frame 30 opened, the chain is inserted into the gap between the inner blocks, and then the upper frame 31 and the lower frame 32 are integrally connected, and the chain is sandwiched between the cross grooves. When the chain is inserted into the cross groove in this state, the normal part passes through the cross groove, but if the chain is deformed, the deformed part hits the pedestal or the fixed block, so it can not pass through the cross groove, A deformed portion can be easily detected. Further, if the groove width is adjusted by replacing the inner block, the present inspection apparatus can be applied to chains having different link diameters and diameters.
[0020]
【The invention's effect】
According to the inspection device of the present invention, the following effects can be obtained.
Since the present device has a cross groove set to a predetermined groove width in advance, a deformed portion of the chain can be easily and accurately detected only by inserting the link chain into the cross groove.
In addition, since the present inspection apparatus mechanically detects a deformed portion by a simple operation without relying on visual observation, there is no problem such as an error or an oversight by an operator, and the reliability of the inspection is high. In addition, the simplicity of the apparatus makes it practical.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state where an upper part of an inspection apparatus according to the present invention is opened.
FIG. 2 is a perspective view showing a state in which an upper portion of the inspection device of FIG. 1 is closed.
FIG. 3 is a perspective view showing a state where a chain is inserted into the inspection device of FIG. 1;
FIG. 4 is a perspective view showing a state in which an upper portion of the inspection device of FIG. 3 is closed and fixed.
FIG. 5 is a perspective view showing another structure of the groove portion in the inspection device of FIG. 1;
FIG. 6 is a perspective view showing an assembled state of another inspection apparatus according to the present invention.
FIG. 7 is a perspective view showing a state where the inspection device of FIG. 6 is closed and fixed.
FIG. 8 is a partial external view of a link chain.
[Explanation of symbols]
10-inspection device,
11-pedestal,
12, 13-fixed block,
14-T type groove,
15-slot,
16-bolt,
17-guide plate,
18-replacement part,
20-link chain,
21-horizontal link,
22-portrait link,
30-fixed frame,
31-upper frame, 32-lower frame,
33-36-inner block,
37, 38-flange part,
39, 40-screw holes,
41-connecting bolt.

Claims (5)

A groove forming body having a cross groove corresponding to the cross-sectional shape of the link chain,
This groove forming body has at least one end of the groove freely releasable so that the link chain can be inserted into the groove,
Inspecting the deformation of the link chain by inserting the link chain inserted from the end along the cross groove,
An inspection apparatus for a link chain, characterized in that: Having a lower groove forming body and an upper groove forming body that cooperate with each other to form a cross groove,
On the upper surface of the lower groove forming body, a groove having a T-shaped cross section is formed penetrating from the front end to the rear end,
The upper groove forming body is formed from a pair of left and right groove forming bodies slidably mounted along the open upper surface of the T-shaped cross-sectional groove of the lower groove forming body so that the inner ends of each other maintain a predetermined gap. Consisting of
By forming a pair of left and right upper groove forming bodies over the T-shaped cross-sectional grooves of the lower groove forming body and fixing them, a cross groove through which a link chain is inserted is formed,
Inspecting the deformation of the link chain by inserting the link chain along this cross groove,
An inspection apparatus for a link chain, characterized in that: In the lower groove forming body, a portion surrounding the T-shaped cross-sectional groove is detachably formed,
By replacing this part, the groove width of the T-shaped groove can be adjusted.
The inspection device according to claim 2. Has a fixed frame that can be divided into an upper frame and a lower frame,
The upper frame and the lower frame each have opposing concave portions,
In this recess, a pair of inner blocks are fixed at an interval from each other,
A cross groove is formed by the interval between the inner blocks,
Inspecting the deformation of the link chain by inserting the link chain along this cross groove,
An inspection apparatus for a link chain, characterized in that: The inspection device according to claim 4, wherein the inner block is formed detachably, and the width of the cross groove can be adjusted by replacing the inner block.

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