JP2006009174A - Covered wire rope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a covered wire rope for a running wire, having good flexibility against bending, prevented from abrasion caused by the contact of wires of a core rope and side members with each other, the contact of the core rope with the side members and the contact of the side members with each other, and achieving good transmission of driving force to a sheave and silence. <P>SOLUTION: The core rope 1 has a core rope body 1a having a synthetic resin core 4 and two or more side strands 5 arranged around the resin core 4 and twisted so as to have spaces between them at one or more parts, and a resin covering layer 1b including the core rope body 1a. The side member 2 has a synthetic resin core and two or more strands or wires twisted around the core. The resin covering layer has spacer parts at the outer periphery, and uniform spaces are formed among respective side members by the spacer parts. A resin layer 301 integrated with the resin layer 300 of the outer layer, going over the circumcircle of the side member fills the spaces, and also fills the spaces among the strands or wires of each of the side members. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a covered wire rope suitable as a moving rope in a wire rope, particularly a crane or an elevator.

A moving rope used in an elevator hoisting rope or a cargo handling machine such as a crane is moved and wound up through a sheave, so that it is subjected to severe conditions in which tension and bending act over the entire length. Moreover, for example, elevator hoisting ropes are strongly required to reduce the sheave diameter and make the system more compact. To achieve this, it is essential to improve the bending fatigue resistance of the wire rope used. It is.

Conventionally, as a rope for a moving rope used at a ratio of sheave diameter to rope diameter of about D / d: 40, as defined in JIS G3525 or 3546, a fiber or steel strand or A structure in which a plurality of side strands are arranged and twisted on the outer periphery of a core rope made of rope was used.
However, in this structure, a high surface pressure is generated between the core rope and the side strand, and friction between the core rope and the side strand is generated when the rope is bent by a sheave or the like. As the core rope wears away and the rope diameter decreases, the surface pressure between adjacent strands increases more and more. As a result, there has been a problem that each strand is worn out or that the strands constituting the core rope and the side strand are broken.

In addition, since the side strand always slides relative to the sheave by metal touch, not only the noise increases, but also the relatively soft sheave wears, and it takes a lot of labor and time to replace an expensive sheave. There was a problem.
In addition, it is necessary to apply oil while using the rope in order to generate rust and improve fatigue, which reduces the coefficient of friction between the sheave and the rope, and the sheave rotation causes the rope to rotate due to slippage between the sheave and the rope. It becomes difficult to transmit accurately, and the accuracy of position control of the object connected to the rope is lowered. For example, in an elevator, the rotational movement of the sheave and the vertical movement of the car are not accurately linked, making it difficult to accurately control the position of the car. As countermeasures, it is necessary to take special measures such as providing undercuts in the groove of the sheave or winding the rope with a double wrap method, resulting in an increase in equipment costs or ropes. This causes a problem that it takes a very long time to install and replace.

As a measure for preventing wear due to contact between the side strands, it is effective to provide a space between the side strands. As a method, side strands are intentionally made to have a thin diameter, and a plurality of such side strands are arranged around the core rope to create a gap between the side strands. In this case, it is inevitable that the position of the side strands becomes unstable and the gaps between the side strands become uneven.
For this reason, problems occur such that the side strands are in direct contact with each other and are abraded or the strands are broken, and the effectiveness cannot be obtained. Further, even if a coating is provided to prevent metallic contact of the side strands, the thickness of the resin layer between the side strands becomes uneven, the thin portion of the resin intervening layer is destroyed, or the side strands are It was not effective because it could not be prevented from being worn by direct contact.

As a breakthrough measure, there is a rope having a structure in which a member having this shape (triangular shape) is interposed in each substantially triangular gap between the core rope and the side strand and twisted together with the side strand.
According to this prior art, contact between the core rope and the side strands is prevented, but since the side strands are in direct contact with each other, it still cannot be avoided that wear occurs. In order to avoid this, it is necessary to interpose the molding filler between the side strands. However, the side strand has a cross-sectional shape having complicated irregularities because a plurality of strands are twisted together. Therefore, it is difficult to produce a filler having a cross-sectional shape that matches this.
In addition, it is difficult to arrange the filler in twisting so as to accurately match the cross-sectional shape of the side strand. Therefore, the generation of gaps and damage to the filler are unavoidable, and the molded filler falls off during use of the rope, and the side strands easily come into direct contact with each other. In addition, the circumscribed circle part of the side strand always touches the sheave and makes a relative sliding to generate noise, and the problem that the sheave is worn and the sheave replacement takes a lot of time and effort is still not solved. . Furthermore, since oiling is necessary, the coefficient of friction between the sheave and the rope changes due to the oil, and the problem that the rotation of the sheave is difficult to be accurately transmitted to the rope still remains.
Japanese Unexamined Patent Publication No. 60-9987 JP 57-121684 A JP 54-30962 A

The present invention has been made in order to solve the above-described problems, and the object of the present invention is to provide a good flexibility for bending, and by contact between the strands of the core rope and the side member. Bending fatigue resistance is improved by reliably preventing wear, wear due to contact between the core rope and the side members, and wear due to contact between the side members, and at the same time, wear due to direct contact between the sheave and the side members is reliably prevented. It is another object of the present invention to provide a covered wire rope for a moving cord capable of realizing good driving force transmission and quietness with a sheave.
Another object of the present invention is to realize a simple structure for preventing contact between strands in each of the core rope and the side member, preventing contact between the core rope and the side member, and preventing contact between adjacent side members. It is another object of the present invention to provide a covered wire rope that can be manufactured at low cost without using a special twisting machine.

  In order to achieve the above object, a covered wire rope of the present invention is a rope having a core rope, a plurality of side members disposed on the outer periphery of the core rope, and a resin coating surrounding the side member. The core rope has a core body having a synthetic resin core and a plurality of side strands twisted so as to have a gap between one or more places around the synthetic resin core, and a resin coating layer enclosing the core rope body, The side member has a synthetic resin core and a plurality of strands or strands twisted around the synthetic resin core, and the resin coating layer has a spacer part on the outer periphery, and the spacer part is substantially between each side member. Uniform gaps are formed, and these gaps are filled with a resin layer integrated with the outer resin layer that exceeds the circumscribed circle of the side member, and gaps between strands or strands of each side member are also provided. The basic feature is that it is buried.

When the present invention, since the core rope body of the core rope is a resin core, metal contact does not occur between the core and the side strands, and at least one gap is formed between the side strands. The contact pressure between the side strands is reduced, and wear damage (fretting breakage) can be prevented. And since the resin coating layer which surrounds the core rope main body of a core rope penetrate | invades into the said clearance gap of the side strand which comprises a core rope main body, metal contact can be prevented further.
Similarly, the side members are also made of resin, so there is no metal contact between the core and side strands (or between the core and side strands), and one or more gaps are formed between side strands or side strands. Therefore, the contact pressure between the side strands or the side strands is reduced, and wear damage can be made difficult.

Since the core rope body and the side member are substantially separated by the resin coating layer that surrounds the core rope body of the core rope, wear due to contact between the core rope and the outer strand is prevented. In addition, since the resinous spacer portion interposed between the valleys of the side members forms a substantially uniform gap between the side members, the metal contact between the side members is prevented and the outer layer that surrounds the side members Since the gap is filled with a resin layer extending from the resin in a centripetal manner, there is no change in the mutual spacing between the side members, and the resin layer interposed between the side members functions as a cushioning material. Wear between each side member is completely prevented.
And since the resin layer integral with outer layer resin surrounding the said side member penetrate | invades in the said clearance gap between side strands or between side strands, the metal contact between side strands or between side strands can be prevented.
Therefore, by these synergistic effects, the bending fatigue resistance can be improved and the life of the rope can be extended.

  In addition, since the entire covering resin layer exceeds the circumscribed circle of the side member, wear due to metal touch between the sheave and the side member is prevented, and the entire covering resin layer is less hard than the sheave so Wear can be prevented. In addition, the entire coating resin layer reduces noise during contact with the sheave and keeps quietness. Nevertheless, a good friction coefficient with the sheave can be obtained, and the force from the sheave can be reliably transmitted to the side member and the core rope. Moreover, since the cross section of the rope is almost circular, the influence of rotation and twisting is reduced. There is no need to lubricate the ropes, so the excellent effect of avoiding surrounding fouling can be obtained.

The side member has a Schenkel structure including a synthetic resin core and a plurality of side strands that are twisted so as to surround the synthetic resin core and have one or more gaps therebetween, or surround the synthetic resin core and the It consists of a strand structure provided with a plurality of strands twisted so as to have a gap between one or more places. The former can make the wire diameter thin, so it can easily cope with a small sheave diameter, and the core rope body and side members of the core rope have the same structure, so it is easy to manufacture. Moreover, since it is not a multi-layer twist structure, there is an advantage that it is easy to form a gap between the side strands and fill the resin into this.
In the case of the former Schenkel structure, the core rope and / or the side strands of the side members are composed of a synthetic resin core and a plurality of strands that are twisted so as to surround the core and to have a gap between one or more places. including. According to this, since the resin is filled also between the strands constituting the side strand, the metal contact can be avoided or the contact surface pressure can be reduced, and the bending fatigue can be further improved.

Preferably, the pitch multiple of the rope is 7 to 15 times the rope diameter. Since the elastic modulus can be increased by increasing the twist pitch of the entire rope in this way, structural elongation under load can be suppressed and productivity can be improved, and even with such a large twist pitch multiple, the outer layer resin coating can be applied. Therefore, there is no problem in shape stability.
Preferably, the twist pitch of the core rope is made smaller than the twist pitch of the side members. This makes it easier for the heart at the center of the rope that has a greater load to be stretched, so that the load balance of the entire rope is uniform and premature damage to the heart can be prevented. That is, when a load is applied to the rope, a uniform load is applied to the core rope and the side member, and the breaking load can be made substantially uniform.

Preferably, the spacer portion is a plurality of spiral grooves formed at intervals on the outer peripheral portion of the resin coating layer surrounding the core rope main body, and each spiral groove has a pitch equal to the twist pitch of the rope. And each of the spiral grooves has a width that allows one or more of the constituent wires of each side member to enter, and the spiral grooves are separated from each other by spiral projections that are interposed between the valleys of the side members. Has been.
According to this aspect, since the resin coating layer of the core rope body itself is a means for separating the core rope body and the side member, it also serves as a means for forming an equal gap between the side members. The number of parts used is small, and the twisting process can be carried out with a general-purpose twisting machine. Further, since the size of the gap between the side members does not change during the use of the rope, and the spacer does not move or wear out, the role of the cushioning material can be reliably maintained until the life of the strand.

  In the above aspect, the resin coating layer and the spiral groove surrounding the core rope main body are incorporated in the resin extruder with a nozzle having a groove for forming a spiral projection, and the core rope main body is inserted into the nozzle. It is made by rotating the nozzle. According to this, the resin coating layer and the spacer can be manufactured efficiently and at low cost.

  The rope according to the present invention is a rope having a core rope, a plurality of side members arranged on the outer periphery of the core rope and twisted, and a resin coating surrounding the entire side member. Arranging a side strand of the two strands and twisting them to form a core rope body, arranging a plurality of side strands or strands around the synthetic resin core and twisting them to form side members, and a core A process of making a core rope by processing a resin coating layer containing a plurality of helical grooves as spacers on the outer periphery, including a rope body, and a part of each side member in each helical groove The process of manufacturing a bare rope in which almost uniform gaps are formed between each side member, and the outer layer of resin that exceeds the circumscribed circle of the side member by passing the bare rope through the extruder And forming, in which the made in the step of forming the intermediate resin layer satisfying the gaps between the strands or between the strands constituting the gap and each side member between the side members.

According to this configuration, the production of the raw rope can be performed by a general-purpose twisted wire machine, and it is not necessary to apply the resin coating surrounding each side member, and the coating process can be performed once, so that the production is easy. A rope can be efficiently manufactured at low cost.
Other aspects and advantages of the present invention will become apparent from the following detailed description, but the present invention is not limited to the configurations shown in the embodiments as long as they have the basic features of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 9 show a first embodiment of a covered wire rope according to the present invention.
In FIG. 1, reference numeral RP <b> 1 indicates the entire rope, and is composed of a single core rope 1, a plurality of side members 2, and an overall covering resin 3 applied so as to enclose the side members 2. ing. The rope structure is 7 × (6 × 7).

  As shown in FIG. 4, the core rope 1 is provided with a resin coating layer 1b so as to enclose the core rope body 1a. The core rope body 1a has a Schenkel structure in which six strands 5 are arranged around a bar-shaped or linear synthetic resin core 4 and twisted. In this embodiment, the side member 2 has a Schenkel structure in which six strands 5 are arranged around the synthetic resin core 4 and twisted.

The synthetic resin core 4 plays a role of improving elongation and preventing core-strand metal contact. The synthetic resin core 4 may be selected from various materials such as polyvinyl chloride, nylon, polyester, polyethylene, polypropylene, and copolymers of these resins in consideration of wear resistance and the like. Resin having abrasion resistance, weather resistance, flexibility (stress crack resistance), and moderate elasticity represented by
However, in order not to collapse the shape by softening due to the heat effect when the resin coating layer or the entire coating resin is applied, it is preferable that the melting point is 120 ° C. or higher and the tensile strength is 20 Mpa or higher. Thermoplastic resins such as polypropylene and high density polyethylene can be mentioned.
The synthetic resin core 4 may be composed of a stranded thermoplastic resin. Further, a reinforcing wire may be provided at the center and a synthetic resin layer may be provided around the reinforcing wire.
A plurality of the reinforcing wires may be twisted together. The material may be other metal such as steel wire or copper, or may be synthetic fiber.

  The thickness (d2) of the synthetic resin core 4 needs to be larger in terms of diameter than the thickness (d1) of the strand 5 in order to reduce the contact pressure between the strands 5. Specifically, since the diameter is preferably increased by 10% or more from the stacking diameter, the thickness of the strand is usually preferably about 0.70 to 0.80 with respect to the thickness of the synthetic resin core. By setting in this way, a moderately large gap (S1) can be formed between the strands 5 as shown in FIG. However, the gaps are not necessarily equal in size, and some strands may be in contact with each other. However, it is not appropriate for all strands to contact.

In this example, the strand 5 has a structure in which six side strands 51 are arranged around the central strand 50 and twisted together. However, the strand 5 is not limited to this, and S (19) or the like. But you can. Steel wires are used as the wires.
The diameter (δ) of the strand is selected so as to be able to cope with fatigue due to repeated bending even if a small-diameter sheave is adopted. In general, when the rope diameter is D, preferably 15 ≦ D / A high-strength strand of δ ≦ 100 is used. For example, a material having a tensile strength of 2400 Mpa or more is used. Such a steel wire is obtained by drawing a raw material wire having a carbon content of 0.70 wt% or more. The strands may have a thin corrosion-resistant coating such as galvanized or zinc / aluminum alloy plated on the surface.

The strand and diameter of the core rope body (heart Schenkel) 1a and the strand diameter of the side member 2 are usually selected from 0.2 to 0.45 mm. The core wire diameter in the side strand 5 of the core rope body 1a and the core wire diameter in the side strand 5 of the side member 2 may be the same or different. Moreover, the side strand diameter in the side strand 5 of the core rope main body 1a and the side strand diameter in the side strand 5 of the side member 2 may be the same, or may differ.
The synthetic resin core 4 may have a circular cross section, or a spiral groove suitable for positioning and arranging strands or strands on the outer periphery may be formed. Even in the former case, by twisting from the state of FIG. 3 where the strands are arranged, the synthetic resin core 4 has a shape in line with the strands like a virtual line due to the strong compressive force generated (in this example, a star shape). Each of the radial projections becomes a spacer, and a preferable gap can be formed between the strands.

As the resin of the resin coating layer 1b of the core rope 1, a thermoplastic resin having good adhesion to the core rope body 1a, such as polyvinyl chloride, nylon, polyester, polyethylene, polypropylene, and a copolymer of these resins can be used. However, a thermoplastic resin having a tensile strength of 30 MPa or more and a D hardness of 50 or more is preferably used so that the resin does not deteriorate even when subjected to repeated bending and the rope shape is kept good. Examples thereof include acrylics and polyurethanes such as ether polyurethanes and elastomers thereof.
Since it is better that the rope has the same or similar physical and chemical properties as the entire rope, a material that is the same as or similar to the overall coating resin 3 is preferable. In the case where a resin different from the whole covering resin 3 is used, those having good adhesion to the whole covering resin 3 are preferable.

The resin coating layer 1b has a thickness sufficiently exceeding the circumscribed circle of the core rope body 1a in order to prevent direct contact between the side member 2 and the core rope body 1a.
The resin coating layer 1b encloses the outline of the strand 5 constituting the core rope body 1a in the same shape, and enters so as to fill the gap S1 formed by the difference in diameter between the synthetic resin core 4 and the strand 5, Thereby, the strands 5 are separated and a buffering action is obtained.

The resin coating layer 1b integrally has a spacer portion for forming a gap between the side members on the outer periphery. That is, spiral grooves 10 are formed on the outer periphery of the resin coating layer 1b at equal intervals by the number of the side members 2, and the pitch of each spiral groove 10 is equal to the twisted pitch of the rope. Yes.
Each spiral groove 10 has a depth and a width capable of dropping one or more strands of the strand 5 constituting the side member 2. In this example, it has an arcuate cross section so that three strands can be positioned. The adjacent spiral grooves 10 and 10 are separated by spiral continuous protrusions 11, and each protrusion 11 has a height that can extend between the valleys of each side member 2 as shown in FIG. 5. The top of the protrusion is flat.
The respective side members 2 are laid along the spiral grooves 10 of the resin coating layer 1b and twisted in that state. This state is shown in FIG. 5, and each side member 2 is stably held by the contact of the three side strands with the spiral groove bottom that forms an arc, and the side members 2 are almost evenly spaced between the side members 2. Since the spiral protrusions 11 are arranged at a proper interval, a substantially uniform gap S2 is secured between the side members. In FIG. 5, only some of the strands 5 constituting the side member 2 are shown in detail, and others are omitted.

The twisting pitch of the core rope body 1a is preferably equal to or less than the twisting pitch of the side member 2. This is to apply an equal load to the core rope 1 and the side member 2 when a load is applied to the rope. Specifically, the pitch multiple of the core rope body 1a is set to 4.0-8. 0, that of the side member 2 is 6.0 to 12.0.
This is a core rope pitch multiple / side member pitch multiple: 0.3 to 1.0. As a result, the elastic modulus of the core rope body 1a is 70 to 100 GPa, the elastic coefficient of the side member 2 is 100 to 130 GPa, and the core rope body 1a having a large load is easily stretched. It is possible to prevent prior damage to the main body.
And it is preferable that the twist pitch multiple of the whole rope, ie, the twist pitch of the whole rope with respect to the rope diameter, is as long as 7-15. Although it is 6.0 to 6.5 in a normal rope, the elastic modulus can be increased by using a long pitch as described above even though the resin coating layer 1b is present in the inner layer.

The resin of the outer coating 3 may be polyethylene, polypropylene, etc., but in addition to wear resistance, weather resistance and flexibility (stress crack resistance), it has moderate elasticity and friction to adjust the coefficient of friction with the sheave. A thermoplastic having a relatively high coefficient and not hydrolyzing is preferred. Examples thereof include acrylics and polyurethanes such as ether polyurethanes and elastomers thereof.
The outer layer coating resin 3 includes a cylindrical outer layer 300 that exceeds the circumscribed circle of the side strand indicated by a one-dot chain line in FIG. 2 and a resin layer 301 that is press-fitted into each gap S2 while enclosing the contour between the side members 2 and 2 in the same shape. have. Thereby, the metal contact between the side members 2 and 2 is completely stopped, wear damage is prevented, and the role of the cushioning material can be maintained until the life of the strand in cooperation with the spacer portion.

If the thickness t from the circumscribed circle of the side member 2 of the outer layer 300 is too thin, the durability t is poor and the wear life is also reduced. However, if it is too thick, the flexibility as a moving cord is impaired, and the rope diameter becomes thick and the strength efficiency is lowered. Therefore, considering these, about 1/5 or less of the rope diameter, for example, 0.3 to The thickness is preferably 2.0 mm.

Each resin layer 301 is integrated with the outer layer 300, extends in a centripetal manner so as to branch from the outer layer 300 between the side members 2, reaches the protrusion 11 of the resin coating layer 1b, and is joined thereto.
The outer layer 300 and the resin layer 301 enter so as to fill the gap S1 between the strands 5 and 5 constituting the side member 2 as shown in FIG. To get to. Therefore, wear damage due to contact between the strands is effectively prevented.
The softening temperature of the resin core 4 of the rope body 1a of the core rope 1 is also preferably equal to or higher than that of the coating resin 1b and that of the outer layer resin 3.

The method of manufacturing the rope of the first aspect will be described. The core rope main body 1a and the side member 2 are respectively created. In this method, the synthetic resin core 4 is inserted into the center hole of the end plate, a plurality of strands 5 are guided from the equally spaced holes located concentrically therewith and twisted around the synthetic resin core 4 by voice. Can be obtained continuously. Since the synthetic resin core 4 has an increased diameter and is softer than the strand, the synthetic resin core 4 is deformed at the portion in contact with the inside of the strand 5 from the state shown in FIG. It will be in a stable state with a gap.
In this step, the twisting pitches of the core rope body 1a and the side member 2 are made smaller than that of the side member 2 as described above.

The core rope body 1a thus obtained is continuously passed through a resin extruder to produce a core rope 1 having a resin coating layer 1b with a spiral groove.
FIGS. 6 to 8 show this process, and a rotating body 92 incorporating a special nozzle 91 is incorporated at the end of an extruder 9 such as a screw type. The nozzle 91 has a mold portion 911 which is convex in the inner diameter direction for forming the groove 10 and a mold portion 910 which is concave in the outer diameter direction for molding the protrusion 11 alternately in the circumferential direction. Has a hole. The nozzle 91 is incorporated in a form of being prevented from rotating by a rotating body 92 having a gear on the outer periphery. The rotating body 92 is rotated around the axis of extrusion by a driving body 93 such as a worm gear. The driving body 93 is incorporated in the driving system 14 so as to be rotated synchronously with the downstream take-up capstan 12 so that the pulling speed of the core rope 1 and the rotation of the rotating body 92 are synchronized.

  Accordingly, the core rope body 1a is inserted into the nozzle 91 of the extruder 9, the take-up capstan 12 is driven and pulled out, and the resin 30 heated and melted by the extruder 9 is pressurized while being wound around the winder 13. For example, the resin coating layer 1b having grooves and protrusions on the outer diameter side is molded around the core rope body 1a by the mold portions 911 and 910 of the nozzle 91. In addition, since the rotating body 92 and the nozzle 91 integrated with the rotating body 92 are rotated by the driving body 93 to which the power of the take-up capstan 12 is transmitted, the grooves and the protrusions have a seamless spiral shape.

Next, as shown in FIG. 9, the core rope 1 having the resin coating layer 1 b with a spiral groove is fed out, and the side member 2 is fed out, led to the voice 7 through the end plate 6, and twisted to the rope. The pitch multiple at this time is set to a long pitch of 7 to 15 as described above.
The end plate 6 has a central rope insertion hole 60 at the center, and side member insertion holes 62 at equal intervals on the outer periphery. When the end plate 6 is rotated and guided to the voice 7 through the core rope 1 and the side member 2, the side members 2 and 2 are arranged in order in the spiral grooves 10 at equal intervals on the outer periphery of the resin coating layer 1b. It is arranged and twisted while maintaining this state. As a result, the raw rope A as shown in FIG. 4 is obtained. The twisting direction of the side member is preferably opposite to the twisting direction of the rope. For example, when the twisting direction of the side member is the S direction, the twisting direction of the rope is the Z direction.

In such a raw rope A, since the core rope 1 has the covering resin layer 1b, the diameter of the core rope 1 is increased by that amount, and a gap is easily formed between the side members 2. Due to the action of the spiral groove 10 and the protrusion 11, the uniform gap S <b> 2 is accurately formed between the side members 2 and 2. At the same time, the side member 2 and the core rope 1 are substantially separated by the resin coating layer 1b.
The raw rope A is wound up once or is not wound up and washed with a washing machine (not shown), and then passed through a die 90 of an extruder 9 for extruding the molten resin 30 under pressure, continuously while being compressed. Overall coating is performed. At the time of this covering extrusion, for example, in the case of ether polyurethane with A hardness of 90 in JIS, the molten resin 30 of about 180 to 200 ° C. is spread from the entire circumference of the raw rope A to the equal gaps between the side members 2 and 2. It is press-fitted into S1 and is also press-fitted into the surface of each strand constituting the side member 2 and the valley between the strands, and is further press-fitted into the gap S1 formed between the strands 5 by the increased diameter resin core 5 Is done. Thereby, a uniform resin layer 301 is formed between the side members 2 and 2.

The side member 2 has a complicated sectional shape with large irregularities, and the molten resin 30 satisfies this shape and finally covers all the side members. Therefore, the adhesive force between the inner part of the cylindrical outer layer 300 completed so as to surround the side member 2 and the side member 2 is high, and the resistance to displacement is large.
In addition, the side members 2 and 2 are completely separated by the resin layers 301, and the intrusion tips of the resin layers 301 reach the protrusions 11 of the resin coating layer 1b. Since the die 90 is finally compressed from the radial direction, the space between the adjacent side members 2 and 2 and the space between the side member 2 and the core rope 1 are filled with resin.
The portions 300 &#0; 301 &#0; of the resin layers 300 and 301 are also press-fitted into the gap S1 between the strands 5 and 5 constituting each side member 2, so that the adjacent strands 5 , 5 are reliably separated.

When the resin of the core rope 1 and the outer layer 3 are made of the same or similar materials, the physical and chemical properties of the resin in the cross section are uniform, so the coating may be broken due to the frictional force and shear force with the sheave. It becomes difficult to shift.
Each resin layer 301 and the protrusion 11 of the resin coating layer 1b are in a relationship of being in close contact with each other. If the temperature difference between the molten resin 30 and the coating resin layer 1b is large at the time of coating, the resin layers 301 and the resin coating layer 1b are difficult to be integrated, but if the temperature difference is small, they are bonded or fused. When it is required that the resin layer 301 and the resin coating layer 1b be integrated as much as possible, the heater 8 is interposed on the line as shown in FIG. Then, it is recommended to preheat to 150 ° C. or less, for example, around 60 to 120 ° C.

In the first aspect, the step of resin-coating each side member 2 in advance is unnecessary, and the side member can be covered when the entire rope is covered, so that the productivity is good and the cost can be reduced.
Various forms can be adopted for the rope manufacturing process. That is, the side members 2 may be twisted together in a state where the resin coating layer 1b of the core rope 1 is not completely solidified. That is, the production of the core rope 1 with the coating resin, the production of the raw rope, and the entire covering may be performed continuously inline. Instead of this, the core rope 1 with the coating resin may be manufactured discontinuously and the raw rope may be manufactured discontinuously.

FIG. 10 shows another example of the first aspect, and the entire rope is denoted by reference numeral RP2.
In this example, not only the core rope body 1a of the core rope 1 has the synthetic resin core 4, but also the side strand 5 itself has a strand 51 around the synthetic resin core 4 &#0; A plurality of wires are arranged and twisted so as to have a gap between one or more places.
Also in the side member 2, each side strand 5 surrounding the synthetic resin core 4 has a plurality of strands 51 arranged around the synthetic resin core 4 &#0; Thus, it is configured by twisting.
According to this configuration, since the gap is created between the strands 51 and 51 in the side strand itself, the effect of reducing the contact pressure is great, and disconnection can be reliably prevented.
For the detailed configuration of each part, the description of the first aspect is incorporated.
Although not shown, the core rope body 1a may be configured as shown in FIG. 3 in combination with the first embodiment, or the side member may be configured as shown in FIG. 3, and these are also included in the present invention.

11 and 12 show a second aspect of the present invention. The rope of this embodiment is indicated by the symbol RP3 as a whole, and includes a single core rope 1, a plurality of side members 2, and an entire covering resin 3 applied so as to enclose the side members 2. It is configured. The rope structure is IWRC + 8 × S (18).
Since the core rope 1 of the second aspect is the same as described above, a plurality of side members 2 (eight in the drawing) are used to explain only the differences. Each side member 2 consists of a multi-layered strand. The structure is arbitrary, but in this example, it is composed of 8 × S (18), in other words, 8 × S (a + 9 + 9) structure. That is, nine relatively thin strands 203 are arranged around the thick synthetic resin core 4 and twisted to form the inner layer 2a, and nine relatively thick side strands 202 are arranged around this. Are twisted together. Instead of this, 8 × S (16), in other words 8 × S (a + 8 + 8), may be used, and the gap between the side strands 202 can be increased.

Accordingly, the number of the spiral grooves 10 and the spiral protrusions 11 on the outer periphery of the resin coating layer is eight, and each spiral groove 10 is fitted with one or two of the side wires 202 of the side member 2. It is a groove with a wide width. For other configurations, the above description is used, and the same reference numerals are given to the same portions.
The entire covering resin 3 is provided so as to enclose the side member 2, and as shown in FIG. 11, a resin layer 301 press-fitted between the side members 2 and 2 and a cylindrical shape surrounding the circumscribed circle of the side member 2. The outer layer 300 is provided.
Since other structures and manufacturing methods are the same as those in the first embodiment except that Schenkel is replaced with strands, the description is incorporated.

Next, specific examples of the present invention will be described.
A covered rope (Example 1) having the structure shown in the first embodiment and having a diameter of 7 × (6 × 7) and a diameter of 10 mm was manufactured. For both the core rope and the side member, the outer layer wire 51 is 0.31 mmφ, the center wire 50 is 0.33 mmφ, both use a tensile strength of 2900 MPa, and the resin core has a diameter of 1.30 mm and a melting point of 170 A polypropylene wire having a tensile strength of 35 MPa was used.
The main body of the core Schenkel had a twist pitch multiple: 5.2, the side member had a twist pitch multiple: 7.0 (therefore, the core / side = 0.74), and the main body was formed of ether-based urethane. The rope pitch multiple was 8.9, and the entire rope was covered with ether-based urethane. The coating thickness t exceeding the circumscribed circle of the side member was 0.5 mm.

A covered rope (Example 2) having a structure of 7 × (6 × 7) and a diameter of 8 mm shown in the first embodiment was manufactured. Both the core rope and the side members use outer layer wire 51 of 0.25 mmφ, center wire 50 of 0.365 mmφ, both use tensile strength of 3100 MPa, and resin core has a diameter of 1.00 mm and melting point of 127 ° C. A high-density polyethylene wire having a tensile strength of 25 MPa was used.
The main body of the heart Schenkel was pitch multiple: 5.0, the side member was pitch multiple: 7.2 (therefore, the center / side = 0.69), and the main body was formed of an ether-based urethane. The rope pitch multiple was 9.8, and the entire rope was covered with ether-based urethane. The coating thickness t exceeding the circumscribed circle of the side member was 0.5 mm.

A fatigue test of the coated ropes of Examples 1 and 2 was performed. As a test method, a well-known S-bending fatigue test with D / d = 20 and a safety factor of 10 was used.
When the result is compared with the conventional 8 × S (19) 10φ, type A, the bending frequency ratio is 16 for Example 1 and 20 for Example 2 when the conventional product is 1. The residual strength ratio was 10% or less of the conventional product, 93% in Example 1, and 98% in Example 2.
According to the present invention, good bending fatigue can be realized, and this result shows that wear due to contact between the strands of the core schenkel and the side member, wear due to contact between the core rope and the side member, and mutual contact between the side members. It is clear that this was achieved by reliably preventing wear due to contact and at the same time preventing wear due to direct contact between the sheave and the side member.

Moreover, when the result of measuring the elastic modulus is shown, the conventional product (with pretensioning) was 60 GPa, whereas Example 1 was 82 GPa and Example 2 was 85 GPa, which was an excellent characteristic.

It is a partial notch perspective view which shows the 1st aspect of the covering rope by this invention. (a) is the expanded sectional view of the rope of FIG. 1, (b) is the partial expanded view. It is an expanded sectional view with the single body before twisting of a core rope main body and a side member. It is an expansion perspective view of a heart rope. Sectional view showing the stage (elementary rope) before the entire coating It is explanatory drawing which shows the manufacture state of a core rope. FIG. 7 is a partially enlarged view of FIG. 6. It is sectional drawing of the nozzle to be used. It is explanatory drawing which shows a rope manufacture state. It is an expanded sectional view showing another example of the 1st mode of the present invention. It is a partial notch perspective view which shows the 2nd aspect of this invention. It is sectional drawing of FIG.

Explanation of symbols

1 core rope 1a core rope body 1b resin coating layer 2 side member 3 entire resin coating 4, 4 &#0; resin core 5 side strand 10 spiral groove 11 spiral projection 300 outer layer resin layer 301 resin layer

Claims (9)

  A rope having a core rope, a plurality of side members arranged and twisted on the outer periphery of the core rope, and a resin coating surrounding the side member, wherein the core rope has a synthetic resin core and one around it. A core rope body having a plurality of side strands twisted so as to have a gap between them at more than one place, and a resin coating layer that encloses the core rope body, and the side members are twisted around the synthetic resin core The resin coating layer has a plurality of strands or strands, and the resin coating layer has a spacer portion on the outer periphery, and the spacer portion forms a substantially uniform gap between each side member, and these gaps are connected to the circumscribed circle of the side member. A covered wire rope characterized in that a resin layer integrated with an outer resin layer exceeding 25 mm is filled, and a gap between strands or strands of each side member is also filled.   The covered wire rope according to claim 1, wherein the side member has a Schenkel structure including a synthetic resin core and a plurality of side strands that are twisted so as to surround the synthetic resin core and to have a gap between one or more places.   3. The core rope and / or the side strand of the side member includes a synthetic resin core and a plurality of strands twisted so as to surround the synthetic resin core and to have a gap between one or more places. Coated wire rope.   The coated wire rope according to claim 1, wherein the side member has a strand structure including a synthetic resin core and a plurality of strands twisted so as to surround the synthetic resin core and have a gap between one or more places. The covered wire rope according to any one of claims 1 to 4, wherein a pitch multiple of the rope is 7 to 15 times a rope diameter, and a twist pitch of the core rope is smaller than a twist pitch of the side member.   The spacer portion is a plurality of spiral grooves formed at intervals on the outer peripheral portion of the resin coating layer surrounding the core rope body, and each spiral groove has a pitch equal to the rope pitch, Each of the spiral grooves has a width that allows one or more strands or side strands to enter, and the spiral grooves are separated from each other by spiral projections that are interposed between the valleys of the side strands. The covered wire rope according to any one of claims 1 to 5, which is in contact with the layer.   Insert the core rope body into the nozzle using an extruder that incorporates a nozzle with a resin coating layer and a spiral groove surrounding the core rope body, and spiral grooves forming grooves at approximately equal intervals. The coated wire rope according to claim 6, which is made by rotating the nozzle while rotating.   A rope having a core rope and a plurality of side members twisted and arranged on the outer periphery of the core rope, and a resin coating surrounding the entire side member, and a plurality of side strands arranged around the synthetic resin core Forming a core rope body by twisting together, forming a side member by twisting a plurality of side strands or strands around the synthetic resin core, and enclosing the core rope body, A process of forming a core rope by processing a resin coating layer in which a plurality of spiral grooves are formed as spacers on the outer peripheral portion at intervals, and a part of each of the side members enter each spiral groove. Twisting together to produce a bare rope in which almost uniform gaps are formed between each side member, and forming a resin outer layer that exceeds the circumscribed circle of the side member by passing the bare rope through the extruder. Coated wire rope according to claim 1 which is made in the step of forming the intermediate resin layer satisfying the gaps between the strands or between the strands constituting the gap and each side member between the side members. The coating according to claim 8, further comprising the step of twisting a plurality of strands so as to surround the synthetic resin core and having a gap between one or more places to obtain a side rope of the core rope and / or side member. Wire rope.

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