JP4979984B2 - Resin-filled wire rope and method of manufacturing the rope - Google Patents

Description

  The present invention relates to a resin-filled wire rope suitable for a wire rope, particularly a crane hoisting rope.

  As a crane hoisting line, a conventional twisted JIS rope such as 6xFi (29) or 6xWS (31) is conventionally used. These wire ropes are made by twisting strands around the fiber core and IWRC, and are used by applying rope grease. Since the wire is worn and fatigued at the portion, and the wire rope is wound around the winch drum and driven, there is a problem that the wire rope is crushed and deformed due to contact between the ropes on the drum.

  In order to solve these problems, in the wire rope for moving ropes, the prior art 1 discloses a rope in which an insert material is inserted between strands in a closing process. Prior art 2 proposes a rope that is resin-coated all around the rope.

  In the prior art 1, the insert material inserted between the strands reaches the circumscribed circle of the rope to maintain the role of reducing elongation and preventing noise and extending the life. Because the number is required and the number of fryer increases, a closing machine capable of special twisting and twisting is required. Moreover, since insert material is twisted together at normal temperature, there exists a problem which cannot be filled with resin between strands.

In Prior Art 2, it is said that covering the entire outer circumference of the rope reduces the wear of the strands and prolongs the service life. Immediate introduction to is difficult. Moreover, since the surface of the rope is not visible due to the covering, there is a problem that the appearance inspection cannot be performed.
JP-A-8-209568 JP 2002-275773 A

  The present invention has been made to solve the above-mentioned problems. The object of the present invention is to prevent wear, fatigue disconnection, and deformation, and to provide a long service life without increasing the rope diameter. It is an object of the present invention to provide a resin-filled wire rope which can be easily inspected visually and manufactured easily.

In order to achieve the above object, the present invention provides a rope in which a plurality of strands are arranged and twisted around a core part,
The core portion is made of a core rope and a coating resin surrounding the core rope, and the plurality of strands are embedded in the coating resin of the core portion while being spaced apart from each other, and the plurality of adjacent strands Between the strands is a member separate from the coating resin, and a filling resin layer integrated with the coating resin is provided,
The filled resin layer is characterized in that the inside of the rope circumscribed circle is filled so that the surface of the strands at the peak portions of the plurality of strands is exposed .
Further, in order to achieve the above object, the present invention is a method for manufacturing a rope in which a plurality of strands are arranged and twisted around a core part,
The plurality of strands are embedded in the coating resin of the core portion while being spaced apart from each other with respect to the coating resin in the core portion formed by arranging the coating resin on the outside of the core rope. A step of arranging the strands, a step of filling the filling resin between the plurality of adjacent strands, and a step of removing excess resin so as to expose the surface of the strands of the mountain portions of the plurality of strands It is characterized by having.

According to the present invention, the trough of each strand is filled with the synthetic resin, and the surface pressure received by the strand is reduced because the surface pressure is received by the strand and the resin. Can be extended. In addition, the contact surface pressure reduction effect can also improve the collapse and deformation of the sheave or drum.
Moreover, the synthetic resin is not covered with a large circumscribed circle that extends beyond the peak of the strand, and some strands on the outermost side of the peak are exposed, so there is no increase in the rope diameter. It can be applied immediately and the surface of the rope can be visually observed, so that the appearance inspection is easy and the maintenance is easy.
Further, since the synthetic resin is filled with a molten resin, the production can be performed continuously and efficiently.

The filling rate of the synthetic resin is in the range of 75 to 115%.
According to this, since the sheave and the resin are in contact with each other, the effect of reducing the contact surface pressure of the strand can be obtained, and since the sheave groove is not relatively small, the problem of squeezing and breaking the resin can be avoided. As a result, the rope diameter slightly increases, but since it is deformed by the elasticity of the resin, there is no problem in using the same sheave.
Preferably, the synthetic resin is filled by extrusion.
According to this, since the synthetic resin is continuously filled, the productivity is high, it can be mass-produced at a low cost, and the molten resin with good fluidity is filled in the gap, so that it can quickly cope with the complex unevenness of the strand. Can be surely filled.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 and 2 show a first embodiment of a resin-filled wire rope according to the present invention.
Reference numeral 1 denotes a rope body, which is composed of a core portion 2 and a plurality of (three in this example) strands 3 arranged around the core portion 2 and twisted together. The core portion 2 is composed of a core rope 4 and a coating resin 5 surrounding the core rope 4, and the core rope 4 is made of IWRC in which six strands 4b are sealed around a core strand 4a and twisted together with grease. In this example, the strand 3 has a 6 × Fi (29) structure. The strand 3 is tightly twisted so that the inscribed circle side is embedded in the coating resin 5 of the core portion 2.

Reference numeral 6 denotes a filling resin layer that fills the valleys of the strands 3, and the innermost part reaches the coating resin 5 of the core portion 2 and is joined thereto. In this example, the filling resin layer 6 is such that the outer surface 60 is substantially flush with the surface of at least one strand 30 on the outermost side of the peak portion of each strand 3, and the filling resin layer corresponds to the cross-sectional area of the valley portion. When the ratio of the cross-sectional area of 6 is defined as the filling rate, in this example, the filling rate is 100%.
In this embodiment, the entire cross section of the rope is circular. According to this, the unevenness when the rope moves is reduced, and there is an advantage that noise generated by contact with the sheave is also reduced.

  3 and 4 show a second embodiment of the present invention. Also in this embodiment, the rope body 1 is composed of the core portion 2 and a plurality of (three in this example) strands 3 arranged around the core portion 2 and twisted together, and the valleys of the strands 3 are filled. Although the resin layer 6 is buried, the core portion 2 is composed of a core rope 4 made of IWRC in which six strands 4b are enclosed and twisted around a core strand 4a, and a grease layer 7 surrounding the core rope 4a. The strand 3 is tightly twisted so as to be embedded in the grease layer 7.

In this embodiment, the filling resin layer 6 is filled such that the outer surface 60 exposes the surface of at least one strand 30 on the outermost side of the peak portion of each strand 3. When the ratio of the cross-sectional area of the filling resin 6 to the cross-sectional area of the valley portion is defined as the filling ratio, this embodiment has a filling ratio of about 80%. Although the cross section of the entire rope is close to a circle, convex portions are formed at intervals due to the presence of the strands 30 whose surface is exposed.

  FIG. 5 shows a third embodiment of the present invention. In this embodiment as well, the rope body is formed from the core 2 and a plurality of (six in this example) strands 3 arranged around the core 2 and twisted together. In this embodiment, the core portion 2 is made of a synthetic fiber core, and the strand 3 is tight so as to sink into the core portion 2. Twisted.

  In this embodiment, the filling resin layer 6 is filled such that the outer surface 60 exposes the surface of at least one strand 30 on the outermost side of the peak portion of each strand 3. In this example, it is configured such that the surface of the next strand swells outwardly between the exposed strands 30 with the exposed strand 30 as a boundary, and thus the entire cross section of the rope is nearly circular. However, convex portions are formed at intervals by the bulge. When the ratio of the cross-sectional area of the filling resin 6 to the cross-sectional area of the valley is defined as the filling rate, this example has a filling rate of about 110%.

In the three embodiments, the resin of the filling resin layer 6 is a thermoplastic resin that has high wear resistance and high strength and can be extruded. Examples thereof include polyethylenes typified by high-density polyethylene, polypropylenes, polyurethanes, engineering plastics, and the like.
When the core part 2 has the coating resin 5 as in the first embodiment, the coating resin 5 is preferably the same quality as the resin of the filling resin layer 6, but may be different.

  The filling rate of the filling resin layer 6 is desirably in the range of 75 to 115%. When the filling rate is 75% or less, the sheave and the resin are not in contact at all, so that the contact surface pressure reduction effect on the strand cannot be obtained. However, if the filling rate is higher than 115%, the sheave groove is relatively small, and the filling resin is broken by rubbing, which is not preferable. At 115%, the rope diameter increases by about 1%, but since it deforms due to the elasticity of the resin, there is no problem in use with the same sheave. Most preferably, the filling rate of the filling resin layer 6 is 80 to 110%.

  In order to obtain the filled resin layer 6, as shown in FIG. 6, an extruder 7a, a forming roll 7b, a cooling tank 7c such as a water tank, and a take-up machine 7d are arranged in this order on the movement path of the rope body 1. By pulling the rope body 1 with the take-up machine 7d, the molten resin is extruded and coated so as to fill the valleys of the strand 3 of the rope body 1 in the extruder 7a, and is heated when it exits from the extruder 7a. The molding roll 7b is squeezed to remove excess resin, and the filling rate is adjusted to 75 to 115%. Then, the resin is cured by passing through the cooling tank 7c.

  In addition, what is illustrated is several examples of the present invention, the rope body structure may be any, the structure and number of the strands are not limited, the core portion is made of a material, and the presence or absence of oiling is not limited.

The result of producing a rope of the present invention and conducting a bending fatigue test is shown.
As the rope body, the structure of the second embodiment: IWRC 6 × Fi (29), 0/0 diameter 16 mm, type B was used. The rope body was covered with 50, 75, 100, 115, and 140% high density polypropylene by an extruder to obtain a rope.
A sample is prepared from the obtained rope, and a fatigue test is performed by reciprocating the test sheave under the conditions of D / d = 25, safety factor: 8,500,000 times using the U bending fatigue tester shown in FIG. The bending fatigue properties were evaluated from the case without filling. The results are shown in Table 1.

  As is apparent from Table 1, the contact surface pressure received by the strand when the filling rate is 75 to 115% is reduced, the occurrence of wear and fatigue breakage is suppressed, and the contact surface pressure is reduced to reduce crushing and Good results with improved shape loss are obtained. The best results are obtained especially when the filling rate is 100%.

(A) is an expanded sectional view which shows 1st Example of the resin filling rope concerning this invention, (b) is the partially expanded view. It is a fragmentary perspective view of 1st Example. It is an expanded sectional view of 2nd Example. It is a partial perspective view of 2nd Example. It is an expanded sectional view of 3rd Example. It is explanatory drawing which shows the example of a filling rope manufacturing process of this invention. It is explanatory drawing which shows a bending fatigue test method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rope main body 2 Core part 3 Strand 6 Filling resin layer

Claims (3)

In the rope twisted by arranging multiple strands around the core,
The core portion is made of a core rope and a coating resin surrounding the core rope, and the plurality of strands are embedded in the coating resin of the core portion while being spaced apart from each other, and the plurality of adjacent strands Between the strands is a member separate from the coating resin, and a filling resin layer integrated with the coating resin is provided,
The resin-filled wire rope is characterized in that the filled resin layer fills the inside of a rope circumscribing circle so as to expose the surface of the wire at the peak portion of the plurality of strands. The resin-filled wire rope according to claim 1 , wherein the filled resin layer is filled by extrusion molding.   A method of manufacturing a rope in which a plurality of strands are arranged and twisted around a core part,
  The plurality of strands are embedded in the coating resin of the core portion while being spaced from each other with respect to the coating resin in the core portion formed by arranging the coating resin on the outside of the core rope. A step of arranging the strands, a step of filling the filling resin between the plurality of adjacent strands, and a step of removing excess resin so as to expose the surface of the strands of the mountain portions of the plurality of strands A method for manufacturing a rope, comprising:

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