JP4118880B2 - Covered wire rope - Google Patents

Description

  The present invention relates to a covered wire rope suitable as a moving cable for a crane or an elevator.

A moving cord used in a cargo handling machine such as a crane or an elevator is subjected to severe conditions in which tension and bending act over the entire length because the rope is moved and wound up through the sheave.
Conventionally, as the rope for such a moving rope, a plurality of side strands are arranged on the outer periphery of a core rope made of fiber or steel strand or rope as defined in JIS / G / 3525 or 3546. A twisted structure 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 a breakage of each strand constituting the core rope and the side strand occurs.

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 solution to 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 such side strands are arranged around the core rope to create a gap between the side strands. In addition, the position of the side strands becomes unstable, and the gaps between the side strands cannot be avoided. As a result, 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. Moreover, even if it is intended to provide a coating 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 it is still unavoidable that the side strands are in direct contact with each other and 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 slides relative to the sheave by metal touching, so the problem of noise generation and wear of a soft sheave that takes a lot of time and effort to replace the sheave is still solved. Not. 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.

The present invention has been made to solve the above-described problems, and the object of the present invention is to reliably prevent wear due to contact between the core rope and the outer strand and wear due to contact between the outer strands. To provide a coated wire rope that improves fatigue and at the same time reliably prevents wear due to direct contact between the sheave and the outer strand, and can realize both good driving force transmission and quietness with the sheave. It is in.
In addition, another object of the present invention is to realize the prevention of contact between the core rope and the outer strand and the prevention of contact between the adjacent outer strands with a simple structure, which can be manufactured at a low cost without using a special twisting machine. An object of the present invention is to provide a covered wire rope that can be performed.

To achieve the above object, the coating-type wire rope of the present invention includes a heart rope (1) and is arranged to the outer circumference twisted together a plurality of side strands (2), enclose the entire of the side strands A rope having a resin coating (3) having a thickness t exceeding the circumscribed circle D of the side strands (2) and (2) , wherein the core rope (1) surrounds the core rope body (1a) and the resin The core rope body (1a) and the side strand (2) are separated from each other by the resin coating layer (1b) , and the side strand is disposed on the outer peripheral portion of the resin coating layer (1b). (2) There are resinous spacers that are interposed between the valleys of (2), and the spacers form almost uniform gaps (S1) between the side strands (2) and (2). (S1) is the circumscribed circle of the side strands (2) and (2) A resin layer (301) integrated with an outer resin layer (300) having a thickness t exceeding D is buried , and the spacer is formed on the resin coating layer (1b) surrounding the core rope body (1a). A plurality of spiral grooves (10) integrally formed at equal intervals on the outer peripheral portion, each spiral groove (10) having a pitch equal to the rope pitch, and the side strands of each side strand (2) That each of the spiral grooves (10) is separated from each other by a spiral protrusion (11) to be interposed between the valleys of the side strands. It is characterized (claim 1).

According to this configuration, since the core rope body and the side strand are substantially separated by the resin coating layer surrounding the core rope body of the core rope, wear due to contact between the core rope and the outer strand is prevented. The Further, the resin-like spacers interposed between the valleys of the side strands form a substantially uniform gap between the side strands to prevent contact between the outer strands, and the outer layer resin that covers the side strands. Since it is embedded with a resin layer that is integrated with and extends in a centripetal manner, there is no variation in the mutual spacing of the strands. Further, since the resin layer interposed between the side strands functions as a buffer material, wear between the side strands is completely prevented. As a result, fatigue resistance is 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 strand, wear due to metal touch between the sheave and the outer strand 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 coefficient of friction with the sheave is obtained, and the force from the sheave can be reliably transmitted to the side strands and the core rope. Moreover, since the cross section of the rope is circular, the influence of rotation and twisting is reduced. No lubrication is required when using the rope, so surrounding pollution is avoided.
Furthermore, since the resin coating layer of the core rope body itself serves as a means for separating the core rope body and the side strands and a means for forming an equal gap between the side strands, the number of parts used is small. Tesumi and the twisting process can be carried out with a general-purpose twisting machine. In addition, since the size of the gap between the strands on each side does not change during use of the rope, and the spacer does not move or wear, the role of the cushioning material can be reliably maintained until the life of the strand.

Preferably, the resin coating layer and the spiral groove surrounding the core rope body are incorporated in a resin extruder with nozzles having spiral projection forming grooves at equal intervals, and the core rope body is inserted into the nozzle. However, it is made by rotating the nozzle (claim 2).
According to this, the resin coating layer and the spacer can be efficiently manufactured at a low cost.

Further preferably, a core rope having a plurality of spiral grooves formed at equal intervals as spacers on the outer peripheral portion of the resin coating layer surrounding the core rope body is used, and a side wire is placed in each spiral groove. Each strand is arranged and twisted so that one or more strands enter, and a strand is formed in which a substantially uniform gap is formed between the strands, and the strand is passed through the extruder to pass the strand. When the resin outer layer exceeding the circumscribed circle is formed, the molten resin is press-filled into the gaps between the side strands to form an intervening resin layer (Claim 3) .

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 strand, and the coating process is completed once, so that the production is easy. A rope can be efficiently manufactured at low cost.
In a preferred second aspect of the present invention, the spacer is composed of a plurality of resin linear bodies, the resin linear bodies are arranged so as to be positioned between the side strands on the outer periphery of the core rope, and twisted with the side strands. It has been. According to this aspect, a substantially uniform gap is formed between the side strands by each resin linear body, and a gap is also formed between the side strand and the core rope body. Since the resin linear body is a component independent of the core rope, it can be freely accommodated with a large or small number of side strands of the rope to be manufactured. The resin coating layer surrounding the core rope body can be thin and does not require a spiral groove, so that no special coating nozzle is required for the manufacture of the core rope. It is preferable that the resin linear body has a reinforcing wire at the center, thereby preventing contact between the core rope and the side strands and contact between the side strands without impairing the steel filling rate in the cross-sectional area. It can be surely prevented.

In this second aspect, the resin linear body is not actively melted and integrated with the resin layer filled in a form branched from the inside of the entire covering resin layer, and exists in an independent solid state. Yes. According to this configuration, since the movement of the side strand becomes smooth when the rope is bent, the flexibility can be improved.
In a preferred third aspect of the present invention, the resin linear body in the second aspect is at least partially melted to become part of the resin layer. According to this, since the resin linear body not only functions as a spacer but also becomes a part of the intervening resin layer, the corners of the adjacent side strands are filled with the resin, and the spaces between the side strands are completely covered with the resin. The resin is filled between the side strands and the core rope, and is integrated with the outer layer resin. Therefore, the wear due to the contact between the core rope and the outer strand, the wear due to the contact between the adjacent outer strands, the wear due to the metal touch between the sheave and the outer strand can be prevented, and while maintaining the quietness, the sheave is excellent. Control of the coefficient of friction is obtained, and the force from the sheave can be reliably transmitted to the side strands and the core rope through the resin layer.

For the ropes of the second and third aspects, resin linear bodies having a reinforcing wire at the center are prepared as spacers, and the resin linear bodies are twisted so as to be positioned between the side strands on the outer periphery of the core rope. Forming a raw rope in which a gap is formed between the side strands, and forming an outer resin layer that exceeds the circumscribed circle of the side strand by passing the raw rope through an extruder, and the molten resin is used as the resin linear body. It is made by the process of press-fitting and filling the gaps between the side strands formed in (1).
In the case of the third aspect, it is preferable that the raw rope including the resin linear body is heated to soften the resin of the resin linear body or melt the surface to make it stick before passing the raw rope through the extruder. As a result, the side strand sits better with respect to the spacer, and the resin of the resin linear body is melted by heat and the reduced diameter of the side strand (behavior approaching the rope center) and interposed between the side strands. Become part of the layer.
In the case of melting the resin linear body, the resin coating layer of the core rope may be omitted, and the resin coating layer may be formed with the resin linear body itself to form a resin layer that separates between the core rope and the side strands. Good. According to this aspect, since the core rope main body which does not have a resin coating layer can be used, the manufacturing cost of a core rope can be reduced. Moreover, since the coating is performed once, the process becomes simple and the cost can be reduced.

  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.

FIG. 1 is a partially cutaway perspective view showing a first embodiment of the coated wire rope of the present invention, FIG. 2 is an enlarged sectional view of FIG. 1, FIG. 3 is an enlarged perspective view of a heart rope, and FIG. FIG. 5-A is a diagram showing a manufacturing state of a core rope, FIG. 5-B is a partially enlarged view of FIG. 5-A, and FIG. 5-C. Is a sectional view of the nozzle to be used, and FIG. 6 is a side view showing a rope production state of the first aspect.
FIG. 7 is a perspective view showing another example of the first mode, FIG. 8 is an enlarged sectional view thereof, FIG. 9 is a sectional view of a core rope, and FIG. 10 is a sectional view of a bare rope.
FIG. 11 is a partially cutaway perspective view of the second embodiment of the present invention, FIG. 12-A is a partially cutaway perspective view showing an example of the spacer in an enlarged manner, and FIG. 12-B is a partially cutout view showing another example of the spacer in an enlarged manner. FIG. 13 is a cross-sectional view of the state of the raw rope, FIG. 14 is a cross-sectional view of the completed rope, and FIG. 15 is a side view of the rope manufacturing state.
FIG. 16 is a cross-sectional view showing the rope of the third aspect of the present invention in the state of a bare rope, and FIG. 17 is a cross-sectional view of the completed rope.
FIG. 18 is a cross-sectional view showing another example of the third mode in the form of a bare rope, FIG. 19 is a cross-sectional view of the completed rope, and FIG. 20 is an explanatory view schematically showing the behavior of the resin when covering the outer layer. It is.
FIG. 21 is a sectional view showing the rope of the fourth aspect of the present invention in the form of a bare rope, and FIG. 22 is a sectional view of the completed rope.

In order to describe the present invention in more detail, it will be described with reference to the accompanying drawings.
1 to 6 show a first embodiment of a covered wire rope according to the present invention, and FIGS. 7 to 10 show other examples of the first embodiment. 11 to 15 show the second embodiment of the present invention, FIGS. 16 and 17 show the third embodiment of the present invention, and FIGS. 18 to 20 show another embodiment of the third embodiment. An example is shown, and FIG. 21 and FIG. 22 show the fourth aspect of the present invention. Hereinafter, it explains in detail according to each mode.

[About the first aspect]
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 strands 2, and an overall coating resin 3 applied so as to enclose the side strands 2. ing.
As shown in FIG. 3, the core rope 1 is provided with a resin coating layer 1 b so as to enclose a core rope main body 1 a configured by twisting steel strands or strands. The structure of the core rope body is arbitrary, but in this example, from the 7 × 7 IWRC in which six side members 104 of the same structure are arranged and twisted around the core member 103 of the 1 × 7 structure. It has become. 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 strand 2 and the core rope body 1a.
The resin coating layer 1b integrally has a spacer for forming a gap between the side strands. That is, on the outer periphery of the resin coating layer 1b, spiral grooves 10 are formed at equal intervals by the number of the side strands 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 at least one strand 202 of the outer layer of the side strand 2. In this example, it has an arcuate cross section so that three strands 202 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 the side strands 2 as shown in FIG. 4. The top of the protrusion is flat.
A plurality of side strands 2 (eight in the drawing) are used. The structure of each side strand 2 is arbitrary, but in this example, it is composed of 8 × S (19), in other words, 8 × S (1 + 9 + 9) structure. That is, nine relatively thin strands 203 are arranged around the core strand 201 and twisted to form the inner layer 2a, and nine relatively thick side strands 202 are arranged around this. It is a twisted form.
Each side strand 2 is laid along each spiral groove 10 of the resin coating layer 1b and twisted in that state. This state is shown in FIG. 4, and each side strand 2 is stably held by the three side strands as outer layers coming into contact with the spiral groove bottom that draws an arc. Since the spiral protrusions 11 with an even spacing are interposed therebetween, a gap S1 having an equal size is secured between the side strands.

In addition, a steel strand is used for each said strand. As the steel wire, one having a tensile strength of 240 kg / cm ² or more is used when high strength is required for the rope. Such a steel wire is obtained by drawing a raw material wire having a carbon content of 0.70 wt% or more. The strand includes those having a thin corrosion-resistant coating such as zinc plating or zinc / aluminum alloy plating on the surface. The diameter of the strand is selected so as to cope with fatigue caused by repeated bending by sheave.

The entire covering resin 3 is formed of a cylindrical outer layer 300 that exceeds the side strand circumscribed circle D indicated by a one-dot chain line in FIG. 2 and a resin layer 301 press-fitted into each gap S1 while enclosing the contour between the side strands 2 and 2 in the same shape. have. If the thickness t from the circumscribed circle of the side strand 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 factors, about 1/5 or less of the rope diameter, for example, 0.3 to It is preferable to set it to 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 strands 2, and reaches the protrusion 11 of the resin coating layer 1b.

  Here, the resin of the outer layer coating 3 may be polyethylene, polypropylene, etc., but in addition to wear resistance, weather resistance, and flexibility (stress crack resistance), it has an appropriate elasticity to adjust the friction coefficient with the sheave. A thermoplastic having a relatively high friction coefficient and not hydrolyzing is preferable. Examples thereof include acrylics and polyurethanes such as ether polyurethanes and elastomers thereof.

  On the other hand, as the resin of the synthetic resin layer 4b of the core rope 1, a resin having good adhesiveness with the core rope body 1a such as polyvinyl chloride, nylon, polyester, polyethylene, polypropylene, and a copolymer of these resins can be used. However, as the entire rope, it is better that the internal resin has the same or similar physical and chemical characteristics. Therefore, the synthetic resin layer 4b is also made of a thermoplastic resin that is the same as or similar to the overall coating resin 3. 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 method of manufacturing the rope of the first aspect will be described. The core rope 1 having the resin coating layer 1b with a spiral groove is manufactured by continuously passing the core rope body 1a through a resin extruder.
FIG. 5A to FIG. 5C 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 1 b having grooves and protrusions on the outer diameter side is formed around the core rope body 1 a 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. 6, while the core rope 1 having the resin coating layer 1b with a spiral groove is fed out, the side strand 2 is fed out and guided to the voice 7 through the end plate 6 and twisted to the rope.
The end plate 6 has a hole 60 through which the core rope 1 is inserted in the center, and a hole 62 through which the side strand 2 is inserted 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 strand 2, the side strands 2 and 2 are arranged in order in the spiral grooves 10 that are equally spaced on the outer periphery of the resin coating layer 1 b. And twisted together while maintaining this state. As a result, the raw rope A as shown in FIG. 4 is obtained. The twisting direction of the side strand and the twisting direction of the rope are preferably opposite. For example, when the twisting direction of the side strand is the S direction, the twisting direction of the rope is the Z direction.

In such an elementary rope A, since the core rope 1 has the coating resin layer 1b, the diameter of the core rope 1 is increased by that amount, and a gap is easily formed between the side strands 2, and a spiral is formed. The uniform groove S1 is accurately formed between the side strands 2 and 2 by the action of the groove 10 and the protrusion 11. At the same time, the side strand 2 and the core rope 1 are substantially separated by the resin coating layer 1b.
The raw rope A is wound once or not wound and washed by a washing machine (not shown), and then passed through a die 90 of an extruder 9 for extruding the molten resin 30 under pressure to perform continuous entire coating. . At the time of this coating extrusion, for example, in the case of an ether-based polyurethane having a Shore hardness D scale of 90, the molten resin 30 of about 180 to 200 ° C. has an even gap between the side strands 2 and 2 from the entire circumference of the raw rope A. It is press-fitted into S <b> 1 and is also press-fitted into the valleys between the surfaces of the strands constituting the side strand 2 and the strands. Thereby, a uniform resin layer 301 is formed between the side strands 2 and 2.

The side strand 2 has a complicated cross-sectional shape with large irregularities, and the molten resin 30 satisfies this shape and finally covers the entire side strand 2. Therefore, the adhesive force between the inner part of the cylindrical outer layer 300 completed so as to surround the side strand 2 and the side strand 2 is high, and the resistance to displacement is large.
In addition, the side strands 2 and 2 are completely separated by the resin layers 301, and the penetration tips of the resin layers 301 reach the protrusions 11 of the resin coating layer 1b. And since it finally compresses from the radial direction with the die | dye 90, between the adjacent side strands 2 and 2 and between the side strand 2 and the core rope 1 will be filled with the resin part.

When the resin of the core rope 1 and the resin of 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 frictional force or 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 at least. 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. If so, it is recommended to preheat to 150 ° C. or less, for example, around 60 to 120 ° C.

  This first aspect does not require the step of resin-coating each side strand 2 in advance, and since the side strand can be coated when the entire rope is covered, the productivity is good and the cost can be reduced. In place of the structure of the present invention, the side strands 2 are respectively pre-coated with resin, twisted with a resin-coated core rope, and when the outer periphery is coated with a resin, Although the resin does not permeate between the core ropes and voids are likely to occur, and the integration of the side strands and the core ropes may be impaired, the present invention eliminates such a concern. Moreover, since the steel material filling rate can be increased, the rope strength can be improved.

  Various forms can be adopted for the rope manufacturing process. That is, the side strands 2 may be twisted together in a state where the resin coating layer 1b of the core rope 1 is not solidified completely. 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.

7 to 10 show another example of the first mode. The rope of this aspect is indicated by the symbol RP11 as a whole. Since the basic structure is the same as described above, only the differences will be described. The core rope body 1a is twisted by arranging six side strands 102 around the central strand 101. × 7 structure. Further, six side strands 2 are used and are arranged around the core rope 1 and twisted. In this example, the side strand has a 1 × 7 structure in which six side strands 202 are arranged and twisted around a central strand 201.
Accordingly, the number of the spiral grooves 10 and the spiral protrusions 11 on the outer periphery of the resin coating layer is six, and each spiral groove 10 fits one or two of the side strands 202 of the side strand 2. It has an inverted trapezoidal cross-section. Of course, it may be a groove having an arcuate cross section as in the case of the basic mode. For other configurations, the above description is used, and the same reference numerals are given to the same portions.

[About the second aspect]
In FIG. 11, reference numeral RP <b> 2 indicates the entire rope, and is provided so as to enclose a single core rope 1, a plurality of side strands 2, the same number of spacers 4, and the side strands 2. The entire coating resin 3 is used.
The core rope 1 includes a core rope main body 1a and a resin coating layer 1b surrounding the core rope main body 1a, as in the first embodiment, but the resin coating layer 1b itself has a spiral groove or a linear projection as a spacer. Is not formed. An arbitrary structure is selected for the core rope body 1a. There are six side strands 2 in this example, and an arbitrary structure is selected.

The feature of this second aspect is that a resin linear body is used as the spacer 4 and is arranged between the valleys of the side strands 2 and 2 and the core rope 1 and twisted with the side strands 2 and 2. Before the coating, the side strands 2 and 2 are evenly separated by the resin linear body 4 as shown in FIG. 13, and a gap S1 is formed between the side strands 2 and 2.
The entire covering resin 3 is applied so as to enclose the side strand 2, and as shown in FIG. 14, a resin layer 301 press-fitted between the side strands 2 and 2 and a cylindrical shape surrounding the circumscribed circle of the side strand 2 The outer layer 300 is provided. The resin linear body 4 is not fused and integrated with the resin layer 301 and exists in a unique form.
The side strand 2 has an appropriate gap with the resin coating layer 1b in the state of the elementary rope A in FIG. 13, but in the completed rope, the side strand 2 is moved closer to the center of the rope due to the tension in the longitudinal direction during the manufacturing process. As shown in FIG. 14, it comes into contact with the resin coating layer 1b. The resin linear body 4 is slightly deformed by the pressure due to the behavior of the side strand 2 and the transfer of heat by contact with the molten resin to be the resin layer, and at least closely contacts the resin coating layer 1b.

The diameter of the resin linear body 4 is selected so as to form a gap between the side strands 2 and 2 in which the molten resin is sufficiently pressed. The diameter varies depending on the number of side strands and the like, but in the case of 6 strands, usually about 1/6 to 1/2 of the strand diameter is preferable. The resin linear body 4 functions as a spacer until the molten resin is press-fitted, and when the molten resin is press-fitted, the shape may be changed as long as it has the above function. A circular shape is acceptable.
The entire resin linear body 4 may be made of a rod-shaped or stranded-line-shaped thermoplastic resin. However, the resin linear body 4 has an appropriate rigidity when twisted with the side strands 2 and 2, and has a strength when the rope is completed. As shown in FIGS. 12-A and 12-B, it is preferable to provide a reinforcing wire 4a at the center and provide a synthetic resin layer 4b around the reinforcing wire 4a. The synthetic resin layer 4b can be continuously obtained by adhering it through the reinforcing wire 4a in a molten resin bath and adjusting the amount of adhesion by squeezing at the outlet or by passing it through a die of an extruder.

The number of the reinforcing wires 4a may be one as shown in FIG. 12-A, or a plurality of the reinforcing wires 4a may be twisted together as shown in FIG. 12-B. As the material, steel strands similar to the strands of the core rope body and side strands are usually used, but may be other metals such as copper or synthetic fibers. The synthetic fiber is preferably a high strength low elongation fiber selected from aramid, ultra high molecular weight polyethylene, wholly aromatic polyester, and the like. The reinforcing wire is made by collecting a large number of yarns made of such fibers into a bundle and arranging the bundle in parallel or twisting with a long lead.
When the resin of the synthetic resin layer 4b is a resin different from the resin of the core rope coating layer 1b and the entire coating resin 3, in consideration of wear resistance, polyvinyl chloride, nylon, polyester, polyethylene, polypropylene And a copolymer of these resins, etc., but from the viewpoint of familiarity with the resin of the core rope coating layer 1b and the overall coating resin 3 and the homogeneity of the internal resin properties, the core rope coating layer 1b A thermoplastic resin having the same or similar characteristics as the resin and the entire coating resin 3 is preferable. Specifically, it is the same as in the first embodiment, and a resin having abrasion resistance, weather resistance, flexibility (stress crack resistance) represented by polyurethane-based, for example, ether-based polyurethane, and appropriate elasticity is used.

In order to obtain the rope of the second aspect, the core rope body 1a is passed through an extruder to manufacture the core rope 1 with the resin coating layer 1b. Moreover, the required number of side strands 2 is manufactured. On the other hand, the required number of resin linear bodies 4 are manufactured separately.
Next, as shown in FIG. 15, the core rope 1 is unwound and the resin linear body 4 and the side strand 2 are unwound and guided to the voice 7 through the end plate 6 and twisted to the rope. The end plate 6 has a hole 60 through which the core rope 1 is inserted at the center, a hole 61 through which the resin linear body 4 is inserted at equal intervals on the outer periphery, and further on the outer periphery. The hole 62 which penetrates the side strand 2 is provided so that the position at may be located in the middle of the holes 61 and 61 of the resin linear body 4.
When the end plate 6 is rotated and guided to the voice 7 through the core rope 1, the resin linear body 4 and the side strand 2, the resin linear body 4 is twisted so as to be positioned between the side strands 2 and 2. While being arranged, the core rope 1 is arranged at equal intervals on the outer periphery of the core rope 1 to form a raw rope A as shown in FIG. The twisting direction of the side strand and the twisting direction of the rope are preferably opposite. For example, when the twisting direction of the side strand is the S direction, the twisting direction of the rope is the Z direction.

In such a raw rope A, the helical resin linear bodies 4 are arranged at equal intervals on the outer periphery of the core rope 1, and a uniform gap S <b> 1 is formed between the side strands 2 and 2. At this time, an appropriate gap S <b> 2 may be formed by the resin linear body 4 between the side strand 2 and the core rope 1.
The raw rope A is wound once or not wound, and is washed by a washing machine (not shown), and is passed through a die 90 of an extruder 9 for extruding the molten resin 30 under pressure as shown in FIG. Continuous overall coating is performed. When the holding temperature of the raw rope A is low, it is recommended that the raw rope A be preheated by the heater 8 so that the molten resin is properly injected and flowed. Since it is not intended, preheating at a high temperature is not essential and may be lower than in the first embodiment.

At the time of the covering extrusion, the molten resin 30 is press-fitted into the uniform gap S1 between the side strands 2 and 2 from the entire circumference of the strand rope A, and the surface of each strand constituting the side strand 2 and the element It is also pressed into the valley between the lines.
Each resin linear body 4 is heated by contact with the high-temperature molten resin 30 and is pressed by the movement of the side strands 2 and 2 toward the center of the rope due to the take-up of the rope downstream, so that it is somewhat deformed. In close contact with the covering resin layer 1b of the core rope 1. Each side strand 2, 2 is in contact with the coating resin layer 1 b of the core rope 1.
As a result, as shown in FIG. 14, the side strands 2 and 2 are separated by the resin layer 301 having an equal thickness and interval, and the side strand 2 and the core rope body 1a are evenly separated by the ring-shaped covering resin layer 1b. Separated at regular intervals. The side strand 2 has a complicated cross-sectional shape with large irregularities, and the molten resin 30 satisfies this shape and finally covers the entire side strand 2.

In the second mode, since the resin linear body 4 is twisted between the valleys of the side strands 2 and 2, the step of coating the side strands 2 in advance is unnecessary, and the side strands are covered when the entire rope is covered. Therefore, the productivity is good and the cost can be reduced.
Moreover, since the resin linear body 4 is not integral with the resin layer 301, the movement of the side strands 2 and 2 when the rope is bent is smooth and the flexibility is improved.
Since others are the same as that of a 1st aspect, description is used. The side strands 2 and the core ropes 1 may have the same structure as that of the first mode represented by FIG. 2, and in that case, eight resin linear bodies 4 are used.

[About the third aspect]
A basic example of this third mode is shown in FIGS. 16 and 17, and the symbol RP3 indicates the whole. 18 to 20 show another example of the third mode, and the symbol RP31 indicates the whole.
1 is a core rope, 2 is a side strand, 3 is an overall coating resin, and these are the same as in the first and second embodiments. The point that the resin linear body 4 is used as the spacer 4 is the same as that of the second embodiment, and the resin linear body 4 is arranged in the valley between the side strands 2 and 2 and twisted. It is the same as that of a 2nd aspect also to set it as the elementary rope A which has the uniform clearance S1 between two.
However, in the third mode, in the state of the raw rope A, the resin linear body 4 that forms a space by restraining the positions of the side strands 2 and 2 is melted at the time of covering the resin layers 301 and 302. It is a characteristic that it is a part of. That is, the outer layer 300 is integrated with the substantially cylindrical intervening resin layer 302 as the inner layer by the resin layers 301 and 301. The resin layer 302 is bonded and integrated with the resin coating layer 1 b of the core rope 1. The resin layer 301 is bonded to match the unevenness of the side strand 2. In addition to the case where the resin linear body 4 does not remain as shown in FIG. 17, only the portion close to the center may remain.

The resin linear body 4 may be the same as that in the second embodiment, and functions as a spacer until the molten resin is press-fitted. When the molten resin is press-fitted, it may be melted by heat. A simple circular shape without directionality may be used.
The resin of the synthetic resin layer 4b is a thermoplastic having the same or similar characteristics as those of the resin of the core rope coating layer 1b and the whole coating resin 3 from the viewpoint of obtaining unity with the resin of the core rope coating layer 1b and the whole coating resin 3. A resin is preferred. In the case of using a different resin, it is preferable that the adhesiveness with the entire coating resin 3 is good. For details, the explanation of the 2nd mode is used.

Also in the third aspect, the structure of the core rope 1 and the structure of the side strand 2 are not particularly limited. In FIGS. 16 and 17, the core rope body 1a is composed of 7 × 7 IWRC, and the side strand 2 has an S (19) structure, and the rope as a whole is IWRC8 × S (19). It has become. 18 and 19, the core rope main body 1a and the side strand 2 have a 1 × 7 structure, and the rope as a whole has a 7 × 7 structure.
Also in this third aspect, the resin linear body 4 is arranged between the adjacent valleys of the side strands 2 and 2 and the core rope 1 and twisted, so that each side strand 2 and 2 in the stage before coating, A gap for ensuring uniform press-fitting of the entire coating resin is formed between the two. And by the whole covering, the resin layer 301 press-fitted between the side strands 2 and 2, the resin layer 302 between the side strands 2 and the core rope 1, and the cylindrical outer layer 300 surrounding the circumscribed circle of the side strands 2 The resin wire 4 is melted and becomes a part of the resin layers 301 and 302.
The rope manufacturing process is basically the same as in the second embodiment, but the raw rope A is wound once or not wound, washed with a washing machine (not shown), preheated by the heater 8, and then melted. The obtained resin 30 is passed through a die 90 of an extruder 9 for extruding under pressure, and continuous entire coating is performed. The preheating temperature may be increased to the first aspect, for example, if the resin used is an ether-based polyurethane, 150 ° C. or less, for example, about 90 to 140 ° C.

At the time of this covering extrusion, the molten resin 30 is press-fitted into the uniform gap S1 between the side strands 2 and 2 as shown in FIG. It is also pressed into the valley between the surface of the strand and the strand.
Since each resin linear body 4 is heated by contact with the high-temperature molten resin 30, the resin layer 4b is sequentially melted from the surface layer, and the molten resin component flows into the gap S2 between the side strand 2 and the core rope 1, At the same time, the molten resin 30 is press-fitted into the gap S2 between the side strand 2 and the core rope 1 through the gap between the resin layer 4b having a reduced volume (cross-sectional area) and the side strand 2, and the coating layer 1b of the core rope 1 And fuse. That is, the resin wire 4 also becomes part of the molten resin for coating and serves to replenish the resin from the inside of the rope.
Thus, as shown in FIGS. 17 and 19, the radial resin layer 301 is formed between the side strands 2 and 2, and the resin layer 301 and the series of ring-shaped intervening resin layers are disposed between the side strand 2 and the core rope 1. 302 is formed. The outer layer 300 is integrally joined to the ring-shaped intervening resin layer 302 between the side strand 2 and the core rope 1 by the radial resin layer 301 between the side strands 2 and 2. Finally, the die 90 is compressed from the radial direction, and the adjacent side strands 2 and 2 and the side strand 2 and the core rope 1 are filled with resin.
When the resin of the core rope 1, the resin of the resin linear body 4 and the resin of the outer layer 3 are made of equivalent or similar materials, the adhesiveness is good and the physical and chemical properties of the resin in the cross section are uniform. The coating is not torn or displaced by frictional force or shear force with the sheave.
Others are the same as those in the second embodiment, and therefore, the same reference numerals are given to the same portions, and the description thereof is omitted.
In addition, a spiral groove suitable for positioning and arranging the resin linear body 4 may be formed on the outer periphery of the resin coating layer 1b of the core rope 1 by applying the first mode.

[About the fourth aspect]
This fourth mode is shown in FIGS. 21 and 22, and the entire rope is represented by reference numeral RP4.
In this embodiment, the core rope 1 is composed only of the core rope body 1a and does not have a resin coating layer. The configuration of the core rope 1 and the side strand is arbitrary.
The resin linear body 4 is twisted with the side strands 2 and 2 so as to be located between the strands of the upper layer of the core rope 1 or the valleys of the strands. Therefore, in this aspect, the resin linear body 4 forms a uniform gap between the side strands 2 and 2, but the gap between the side strand 2 and the core rope 1 is smaller than in the case of the above aspect. Moreover, in this aspect, since the interposition resin layer 302 between the side strand 2 and the core rope 1 is formed using the resin of the resin linear body 4, the resin wire 4 has a large volume of the resin layer 4b, Therefore, a thing with a large diameter is suitable.
Only one side strand 2 is shown in detail, and the other side strands are simplified. The other parts are the same as those in the first embodiment, and thus the same reference numerals are given to the same parts and the description thereof is omitted.

In the fourth aspect, since each resin linear body 4 is heated by contact with the high-temperature molten resin 30, the resin layer 4 b is sequentially melted from the surface layer, and the molten resin component is between the side strand 2 and the core rope 1. In parallel with this, the molten resin 30 is pressed into the gap S2 between the side strand 2 and the core rope 1 through the gap between the resin layer 4b having a reduced volume (cross-sectional area) and the side strand 2, and the core rope. 1 covering layer 302. That is, the resin wire 4 also becomes a molten resin for covering the core rope 1. Therefore, in the fourth aspect, preheating is essential and it is preferable that the temperature be as high as possible.
In the fourth aspect, since it is not necessary to provide the covering resin layer on the core rope 1, the cost is reduced. Moreover, the diameter of a rope can be made thin and the steel filling rate can also be made high.

Claims (3)

The core rope (1), the plurality of side strands (2) arranged and twisted on the outer periphery of the core rope, and the thickness surrounding the entire side strand and exceeding the circumscribed circle D of the side strands (2) (2) a rope having a resin coating (3) having t, and the core rope (1) has a core rope body (1a) and a resin coating layer (1b) surrounding the core rope body (1b), and the resin coating layer (1b) The core rope main body (1a) and the side strand (2) are separated from each other, and the outer periphery of the resin coating layer (1b) is made of resinous material interposed between the valleys of the side strands (2) and (2). There is a spacer, and a substantially uniform gap (S1) is formed between the side strands (2) and (2) by the spacer, and the gap (S1) is connected to the circumscribed circle of the side strands (2) and (2). Integrated with the outer resin layer (300) having a thickness t exceeding D The resin layer (301) is buried , and the spacer is formed by a plurality of spiral grooves ( 1 ) integrally formed at equal intervals on the outer peripheral portion of the resin coating layer (1b) surrounding the core rope body ( 1a ). 10), each spiral groove (10) has a pitch equal to the rope pitch , has a width that allows one or more of the side strands of each side strand ( 2 ) to enter, and each spiral groove The covered wire rope is characterized in that the grooves (10) are separated from each other by a spiral projection (11) for interposing between the valleys of the side strands . A resin coating layer (1b) that surrounds the core rope body (1a) and a plurality of spiral grooves (10) that are integrally formed on the outer peripheral portion of the core rope body (1a) are formed at equal intervals to form a spiral projection. A resin extruder (9) incorporating a nozzle (91) having a groove is used to rotate the nozzle while inserting the core rope body (1a) through the nozzle (91). The covered wire rope according to item 1 . A circumscribed circle D of the side strands (2) and (2) surrounding the whole of the side strands (2) and the plurality of side strands (2) arranged on the outer periphery of the core rope (1) and twisted. A rope having a resin coating (3) with a thickness t exceeding 1, and as a core rope (1), a plurality of spirals as spacers on the outer periphery of the resin coating layer (1b) surrounding the core rope body (1a) Jo grooves (10) using the one formed at equal intervals, each spiral groove (10) in the twisting by disposing the side strands (2) as above one enters the side Element Wire Then, the side strand (2) is obtained by manufacturing the raw rope (A) in which a substantially uniform gap (S1) is formed between the side strands and passing the raw rope (A) through the resin extruder (9). wherein each side Stra to form the resin layer of a thickness t exceeding a circumscribed circle D of (300) Coating type wire rope gap (S1) to the intermediate resin layer (301) the process and in-made claims claim 1 wherein forming between de.

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