JP2001248082A - Braid rope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a braid rope allowing to confirm looseness of a fastened part fixing a thimble, etc., at a glance and having a display part scarcely subjected to a damage at the end part of the braid rope. SOLUTION: Inner lines 71a at the base end side and inner lines 71b at the end side are installed so as to overlap by winding the end part of the rope around the thimble 73 and the thimble 73 is fixed by fastening the overlapped part with yarns 75 and 77 at the end part of the braid rope 70. At least one line of the turned inner lines 71b is a display line 710 painted with a different color or pattern according to the longitudinal direction and the display line 710 is partially exposed from an outer layer 72a to form the display part 80. The display line 710 is moved toward the thimble 73 with the inner lines 71b at the end side and the color, etc., exposed to the display part 80 is varied when the fastened part is loosed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade rope (a fiber rope, also referred to as a sling) used for lifting a heavy object which is used for a winch or a crane, and more particularly to an end of a blade rope. The present invention relates to a blade rope deterioration detecting means for detecting a looseness (a detachment) of an annular portion or a thimble fastening portion formed in a portion.

[0002]

2. Description of the Related Art A braided rope formed by bundling a plurality of strands of high-strength nylon fiber or polypropylene fiber to form an inner layer wire and covering the outer periphery with a cloth-like sheath such as tetron is a metal wire. Compared to conventional wire ropes, it has superior properties in terms of lightness, weather resistance, impact cushioning, flexibility, resilience, etc.It is widely used in the industry taking advantage of these characteristics. . In addition, since these synthetic fibers have electrical insulation properties and certain chemical resistance, it is not possible to use wire ropes, for example, lifting ropes used in electric wiring work and surface treatment plants. In addition, it has become an indispensable existence as a winch rope used for a lifting device such as a winch or a crane.

[0003] When a blade rope is used as a lifting rope, it is necessary to provide annular eyeballs at both ends of the rope. When used as a winch rope, it is necessary to provide a hanging hook at the tip of the rope, and a thimble is generally provided on the blade rope so that an uneven load or a local concentrated load does not act. The thimble is a small-diameter pulley-shaped member, and after winding the rope to the outer diameter of the thimble, the wound rope tip is inserted into the outer layer of the proximal rope to provide an overlap between the inner layer lines, The thimble is fastened and fixed by tightening the overlapping portion with a synthetic fiber yarn (fastening thread). The hook for hanging the suspension is locked with a shackle or the like in a hole provided in the center of the thimble. The annular eyeball portion is the same as the state without the thimble, and the overlapping portion is fastened and configured by the same method as described above.

In the blade rope having such a structure, the shape of the eyeball portion is maintained and the thimble is fixed.
It is the frictional force at the overlapping portion of the inner layer line, and what keeps the frictional force high is the yarn tightening force at the fastening portion. For this reason, if the yarn tightening force is reduced during long-term use or an impact load is repeatedly applied in the rope pulling direction, the frictional force between the inner layer lines in the overlapping portion cannot withstand the rope tension. The so-called "pull-out", in which the folded end is gradually drawn toward the annular portion
Occurs. The detachment of the inner layer line indicates a decrease in the yarn fastening force and a decrease in the contact length of the inner layer line overlapping portion, that is, the loosening of the fastening portion as described above, and when this state is left,
When the load is lifted, the fastening portion may suddenly come off and the load may fall, causing serious danger.

[0005] For this reason, in a lifting device using a blade rope, it is mandatory to visually inspect the loosened or loosened connection portion at the start of daily inspections to ensure safety. Since it is generally difficult to quantitatively grasp the state of the detachment, a blade rope provided with an “exit detection indicator” for quantitatively displaying the detachment state has been devised. For example, Japanese Patent Application No. 10-121390 discloses that at least one end portion of a braided rope inner layer wire wound around a thimble, folded and fastened,
A blade rope is disclosed in which a predetermined length is exposed from an outer layer covering a fastening portion outer layer. When the inner rope is dislodged with use of this braided rope, the tip length of the inner layer wire exposed to the outer layer of the fastening part changes (shortens). It is configured such that the state of the omission can be detected by measuring.

[0006]

According to the blade rope having the disclosed structure, it is possible to quantitatively detect and grasp the detached state of the inner layer line by measuring the tip length of the exposed inner layer line. Can be. However, in such a configuration, there is a problem that the terminal of the inner layer line serving as an indicator is protruded from the outer layer, so that the terminal is easily damaged, and it is not possible to judge when the terminal is broken off. Also, since the degree of the protruding length indicates the loosened state of the fastening portion, it is necessary to measure the protruding length sequentially in daily inspection, and it is difficult to judge immediately visually,
There was a problem that. These were important issues to be solved in order to ensure safety.

[0007] The present invention has been made in view of the above-mentioned problems, and does not break even under severe use conditions.
It is another object of the present invention to provide a blade rope having a safety function capable of detecting loosening of a fastening portion at a glance.

[0008]

In order to achieve the above-mentioned object, the present invention has a rope wire in which an outer layer is coated on an inner layer wire formed by bundling a plurality of strands, and at least an inner layer in the rope wire is provided. The overlapping portion is formed by looping the distal end of the wire in an annular shape, and the folded distal end of the overlapping portion is inserted into the outer layer of the base rope line, and the overlapping portion is fastened to the end of the rope line. Blade rope having an annular portion (for example, winch rope 7 in the embodiment)
In (0), the wire has a display line having a different color or pattern depending on the longitudinal position of the wire at a portion folded back in an annular shape, and an intermediate portion in the folded portion of the display line is provided outside the outer layer. Exposed to form a blade rope.

In the blade rope having the above structure, the wire has a display line having a different color or pattern depending on the longitudinal position of the wire at the folded portion, and the display line has the folded portion. Are exposed to the outside of the outer layer. When the fastening part is loosened and the inner layer (element wire) comes off, the display line also moves at the same time. Therefore, it is necessary to detect the loosening of the fastening part by visually checking the change in the color or pattern of the display line in this exposed part. Can be. As described above, in the above configuration, the middle part of the display line is exposed, and the display line is embedded in the outer layer on both sides of the exposed part (hereinafter, referred to as “display part”). There is no risk that the protruding end will be torn off or lost, and the protruding length will be unknown due to wear. In addition, since the display unit displays a color or a pattern according to the progress of the inner layer removal, the worker can immediately detect the situation at a glance. For example, if the color appearing on the display unit is changed from blue in the initial state to red or from blue to red via yellow, the operator can intuitively grasp the deterioration state in daily inspection. be able to.

[0010] In addition to the above chromatic colors,
For example, it may be an achromatic color such as white changing to black, or a metallic color such as gold or silver. In addition, the pattern may include characters such as "attention" and "danger" in addition to figures such as dot size and density change, obliquely colored diagrams, pictograms, etc. in the polka dot pattern.

A thimble, which is a connecting member, is provided at the center portion of the annularly folded portion, and the thimble is fastened and fixed to the end of the rope wire by fastening an overlapping portion to form a blade rope. It is possible to provide a blade rope for a winch rope or the like, in which an uneven load or a local concentrated load is not applied to the annular portion of the rope and loosening of the fastening portion is not easily generated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, an aerial work vehicle equipped with the blade rope according to the present invention as a rope of a winch device is shown in FIG. 9, and the configuration of the aerial work vehicle will be described. The aerial work vehicle 1 is provided with a swivel 3 disposed on a vehicle body 2 of a vehicle capable of traveling with a driving cabin 2a so as to be horizontally rotatable with respect to the vehicle body by the operation of a swing motor (not shown). The boom 4 which is raised and lowered by the raising and lowering cylinder 12 is pivotally mounted on the boom 4. The boom 4 includes a telescopic boom 4a, a middle boom 4b, and a distal boom 4c, which are telescopically moved by a telescopic cylinder 13 built in the boom 4. Base end boom 4a
Is pivotally connected to the swivel 3.

A vertical post 6 which is always vertically held by a leveling cylinder (not shown) is pivotally connected to the distal end of the distal end boom 4c, and a work table 8 is attached to the vertical post 6 via a swing arm 7. I have. The worktable 8 is configured to be horizontally swingable (freely swingable) around the vertical post 6 by the operation of a swing motor (not shown) built in the vertical post 6. A winch device 40 is provided at the upper end of the vertical post 6, and can lift heavy objects. Outrigger jacks 18 are provided on the front, rear, left and right sides of the vehicle body 2, and when working at a high place, the outrigger jacks 18 are extended downward to lift and support the vehicle body 2 stably.

A winch device 40 is provided at the upper end of the vertical post 6 as shown in FIG. 8 and is mounted horizontally and freely by a winch turning motor 61 incorporated in the vertical post 6. A winch body 42 and a winch body 4 pivotally connected on a swivel base 41 and mounted to be able to move up and down by a winch up and down cylinder 62.
The winch arm 43 is attached to the winch arm 43 so as to be able to extend and retract, the sheave 45 is rotatably attached to a sheave bracket 44 at the tip of the winch arm 43, and the winch rope 70 is attached to the winch body 42 so that the winch rope 70 can be wound up or extended. And a winch mechanism 50. The terminal of the winch rope 70 is fixed to the winch drum 52 of the winch mechanism 50 and wound around the drum 52, and the end of the winch rope 70
5, and a hook 82 is provided at a tip end thereof via a shackle 81 for hanging the suspension.

The work table 8 is provided with an upper operating device 20 capable of operating a boom and a winch, and a lower operating device 21 capable of operating a boom is provided at a rear portion of the vehicle body 2. For this reason, the worker who boarded the worktable 8 can operate the upper operation device 20 to perform the boom operation such as the swivel operation of the swivel table 3, the up and down movement of the boom 4, and the expansion and contraction operation. Can be moved to a desired height. Further, the upper operation device 20 can be operated to perform a swing operation of the winch swivel table 41, an up-and-down operation of the winch arm 43, and a winding and unwinding operation of the winch rope 70 by the winch mechanism 50. The locked heavy object can be lifted from the ground or suspended from the ground. The operator on the ground can operate the boom by operating the lower operation device 21.

By the way, the aerial work vehicles as described above are often used for electrical installation work such as maintenance of overhead electric wires and replacement work of pole transformers and switches. In such an aerial work vehicle, it is necessary to perform work in the vicinity of a complicated overhead electric wire, and the operator mistakenly operates the work table 8 or the winch arm 4.
3. Even when the winch rope 70 or the like is brought into contact with a live line, it is necessary to prevent an electric shock or damage to an operator on board.

For this reason, in the case of an electric work aerial work vehicle, the work table 8, the tip boom 4c, the winch arm 43 and the like are formed of GFRP which is an electrically insulating material.
Optical communication using an optical fiber is performed for communication between the vehicle side and the vehicle body side. The winch rope 70 is a blade rope (fiber rope) using a synthetic fiber having electrical insulation so that a member charged with electric potential can be lifted in an uninterrupted construction method, not only when the winch rope 70 is accidentally brought into contact with a live line. Is used.

Therefore, when the worker mistakenly performs the boom operation or the winch operation to bring the work table 8 or the winch arm 43 into contact with a live line, or temporarily supports the overhead electric wire with the winch arm 43, the winch rope Even when a member charged with the electric potential is lifted at 70, the worker who gets on the work table 8 does not receive an electric shock or damage the aerial work vehicle 1.

The winch rope 70 is connected to the winch drum 5
And a winch rope tip 70 which has a thimble 73 at one end of the rope and is connected to a hook 82 via a shackle 81.
b. The rope is made of synthetic resin fiber having electrical insulation such as high-strength nylon, and the inner layer wire 71 formed by bundling a plurality of strands of which the surface is subjected to a non-slip surface treatment such as rosin treatment, and an electric insulation such as tetron. The inner layer wire 71 made of synthetic resin fiber having
And a mesh-like outer layer 72 for protecting the inner layer line 71 from the outside.

The tip 70b of the winch rope 70 is shown in FIG. 1 in a longitudinal sectional view, and as shown in FIG.
It is wound around and folded, and the inner layer line 71a on the proximal end side
And the folded inner layer wire 71b is tightly fastened with yarns 75 and 77 to form a thimble 73.
Is fixed. Thimble 73
Is made of a synthetic resin material such as nylon or a metal material such as stainless steel into a pulley shape by a known processing method. A connection hole 73h for connecting a shackle 81 is provided at the center of the cylinder. ing.

The rope tip 70b is shown in FIGS.
It is formed by a method as shown in FIG. First, as shown in FIG. 3 (A), the outer layer 72 at a predetermined dimension position at the tip of the rope.
The markings 72h and 72i are made on the portion, and the mesh of the outer layer mesh at the position 72h is expanded to take out the inner layer line 71 (B).
Next, the mesh mesh at the position of the marking 72i is expanded,
From here, the leading end 71b of the inner layer line is inserted into the outer layer as shown by the arrow, and is fed into the rope base end side (C). As a result, in the outer layer 72a on the proximal side of the rope,
And an overlapping portion of the tip side inner layer line 71b is formed. The surplus outer layer end 72b is covered over the inner layer line as shown by the arrow in FIG. (C), and the distal end is inserted into the proximal outer layer from the opening 72h (D). ). Thereby, the outer layer 72b on the distal end side is arranged to be crushed in the outer layer 72a on the proximal side of the rope. Further, the annular portion 70c thus formed is in a state where the inner layer wire 71 is covered with the outer layer 72 and is protected, so that the strength of the annular portion can be maintained high.

FIG. 1 or FIG.
In the lower part of the rope, the inner layer lines (71a, 71
b) has an overlapping portion that comes into contact with each other, and the upper layer in the figure has an outer layer (72a, 72b) that has an overlapping portion that comes into contact with each other. These two layers tend to move in opposite directions when a tensile force is applied to the annular portion 70c, and therefore have a high resistance to disengagement (there is little occurrence of disengagement).
It has a configuration. A thimble 73 is disposed on the annular portion 70c formed at the tip of the rope.
The thimble 73 is tightened by further drawing the outer layer 1b and the outer layer distal end portion 72b toward the proximal end side. Then, in this state, the inner product winding and the outer product winding for more securely fastening the overlapping portion are performed.

In the inner winding, the overlapping portion of the rope is skewered (referred to as yarn piercing) with a small-diameter synthetic resin yarn (fastening thread) 75 and sewn in a figure-eight shape, and the inner layer line and the outer layer line at the overlapping portion are formed. It is intended to strengthen the conclusion. This yarn stab is performed at a plurality of positions in the orthogonal direction in the overlapping section. The outer product winding is performed by winding and binding a yarn 77 made of a synthetic resin having a larger diameter around the outer periphery of the inner product winding, and a method called a ligature is used. In this method, the yarn 77 is tied and tied every one turn, so that even if some knots are loosened, the fastening force does not suddenly decrease. The outer product winding is performed in a plurality of blocks, and the knot in each block is arranged at a position shifted by rotating the rope by 90 degrees in the circumferential direction of the rope. Such an outer product winding protects the inner inner product winding and prevents the inner product winding from being loosened by tightening the outer product winding. Note that in FIG.
n is schematically shown by a black solid circle.

At the base end side of the winch rope fastening portion where the inner and outer windings are applied and the overlapping portion of the inner and outer layers is firmly fastened, a "pull-out detection indicator" for indicating the looseness of the fastening portion is formed. You. This means that among the wires of the inner layer wire 72b wound around the thimble 73 and turned back, one of the wires having different colors according to the longitudinal position is partially exposed from the outer layer 72a as a display line. It is a thing. In this embodiment, an element wire in which the middle part of the inner layer line 71b is painted in two colors of blue and red is used as the display line 710, and the colored display line is exposed from the outer layer. Is configured to detect looseness. The display line 71
A configuration may be adopted in which a plurality of display units 80 are provided in the circumferential direction by using a plurality of 0s.

FIG. 4 is a partially enlarged view of the indicator portion shown in FIG.
4 (A) to 4 (C) show, in chronological order, changes in the display from the beginning of use of FIG. Since the color cannot be displayed on the attached drawing, the portion 710g colored blue in the display line 710 is formed as a grain pattern (a collection of black dots), and the portion 710r colored red is painted black and displayed. I have.

In the initial state of use shown in FIG. 4A, that is, in a state before the inner layer line 71b is still missing, the display line 7
Reference numeral 10 is at the initial position, and blue color indicating safety is displayed on the display unit 80. With the use of the winch rope 70, the tightening force of the yarn gradually decreases, and in this state, when an impact load is repeatedly applied in the pulling direction of the rope, the frictional force between the overlapping inner layer lines 71a and 71b withstands the rope tension. As a result, the inner layer line 71b on the folded side is gradually drawn in the thimble 73 direction (to the right in FIG. 4). Therefore, the display line 710 moves together with the return-side inner layer line 71b, and the red portion 710r is partially displayed on the display unit 80 as shown in FIG. 4B. This state indicates usage caution. When the loosening of the fastening portion further proceeds, the display line 710 further moves to the right in the figure together with the inner layer line 71b, and only the red portion 710r is completely displayed on the display portion 80 as shown in FIG. Become so. This display form means that use is prohibited.

Therefore, the operator who uses the winch rope can immediately and intuitively check the color of the display line displayed on the display unit 80 not only at the time of starting inspection but also at the time of normal use. The deterioration state of the winch rope 70 can be detected. Further, according to the omission detection indicator having such a configuration, the display line has a configuration in which the intermediate portion is exposed instead of the tip portion of the strand, so that the display line does not break or wear, and the reliability is improved over a long period of time. A high safety display function can be provided.

In the above, the case where the blade rope is used as the winch rope 70 has been described as an example, and the configuration example in which the thimble 73 is provided at the tip of the rope has been described. However, the present invention is not limited to this embodiment. For example, a structure having an annular portion without providing the thimble 73 at the distal end portion (see FIG. 3) can be used as a rope for lifting or pulling sideways. Further, in the embodiment, a rope having a circular cross section is exemplified. However, for example, a rope having a rectangular cross section (also referred to as a belt-shaped rope or a sling) may be used. Can be.

[0029]

As described above, according to the present invention, an annular portion is formed by looping the tip of a rope wire formed by bundling a plurality of strands and covering the outer layer with an inner layer wire.
In the blade rope configured by inserting the folded back portion into the outer layer and fastening this portion, a display line having a different color or pattern is provided according to the longitudinal position of the folded wire, and the display line is provided. The blade rope is configured such that a middle portion of the wire is exposed to the outside of the outer layer, and the looseness of the fastening portion can be detected based on the color or pattern of the displayed display wire. In the above configuration, the middle part of the display line is exposed and the display line is embedded in the outer layer on both sides of the display part, so that the protruding end is torn off or worn away, and the display content is unknown. There is no danger. Further, since a color or a pattern corresponding to the looseness of the fastening portion is displayed on the display unit, the operator can immediately and intuitively detect the deterioration of the winch rope 70 by visually checking the color of the display line. be able to. Therefore, it is possible to provide a blade rope having a highly reliable safety display function over a long period of time.

A thimble, which is a connecting member, is provided at the center of the looped-back portion, and the overlapping portion is fastened. The thimble is fastened and fixed to the end of the rope to form a blade rope. It is possible to provide a blade rope that does not apply an eccentric load or a localized concentrated load to the annular portion and is unlikely to cause loosening of the fastening portion.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a tip portion of a blade rope according to the present invention.

FIG. 2 is an external view of a tip portion of the blade rope.

FIG. 3 is an explanatory diagram for explaining a method of forming the tip of the blade rope in a time series.

FIG. 4 is an explanatory diagram illustrating the operation of a slack detection indicator in the blade rope according to the present invention.

FIG. 5 is a perspective view showing a configuration of an aerial work vehicle using the blade rope as a winch rope.

FIG. 6 is a front view showing a winch device of the aerial work vehicle.

[Explanation of symbols]

70 Winch Rope (Blade Rope) 70a Rope (Rope Line) 70b Winch Rope Tip 70c Annular Part 71 Inner Line (71a Base Inner Line, 71b Folded Inner Line) 72 Outer Layer 73 Thimble 710 Indicator Line

Claims (2)

[Claims] An inner layer formed by bundling a plurality of strands has a rope line in which an outer layer is covered, and at least a tip portion of the inner layer line of the rope line is folded back to form an overlapping portion. A blade rope formed by inserting the folded distal end portion of the overlapping portion into an outer layer of a proximal rope line and forming an annular portion at an end portion of the rope line by fastening the overlapping portion; The strand has a display line having a different color or pattern depending on the longitudinal position of the strand in the annularly folded portion, and exposes an intermediate portion in the folded portion of the display line to the outside of the outer layer. A blade rope characterized in that: 2. A thimble, which is a connecting member, is provided at the center of the annularly folded portion, and the thimble is fastened and fixed to an end of the rope by fastening the overlapping portion. Blade rope according to 1