JP4989703B2 - Wire rope - Google Patents

Description

The present invention relates to a wire rope composed of a mixed core rope of synthetic fiber spun yarn and synthetic fiber yarn, and more particularly to a wire rope suitable for use in elevators, lifts, cranes and the like.

  Wire ropes such as elevators and lifts are usually provided with a core rope impregnated with lubricating oil in the center, and if the rope is subjected to large tension or bent, the lubricating oil will ooze out from the core rope. The exuded lubricating oil adheres to the steel wire, which is a bare wire, to prevent rusting, corrosion and wear, and to improve flexibility and fatigue resistance wound around the sheave.

The core rope may be a metal core or a fiber core, and the wire rope using the metal core has high strength and excellent breaking load, but is not flexible enough to be repeatedly bent. It was not suitable for the elevator rope to join.

On the other hand, a wire rope using a fiber core is inferior to a metal core wire rope in terms of breaking load, but is remarkably superior in terms of flexibility, and is therefore suitable for an elevator rope that is repeatedly bent.

As the core of the fiber core, it is configured by twisting natural fibers such as sisal hemp, manila hemp, jute hemp, or by twisting synthetic fibers such as polypropylene, polyethylene, polyester, polyamide, and aramid fibers. Things are used.

Natural fiber core ropes have excellent lubricating oil impregnation properties, so they absorb a sufficient amount of oil and have the advantage of allowing the lubricating oil to exude over a long period of time. Although it has advantages such as having shape retention against large pressure received by the strands, natural fibers are originally thick, coarse and rigid short fibers. There may be variations in the size of the diameter when making. If there is a variation in the diameter of the core rope, the surface pressure with the strands twisted around the outer circumference of the core rope will not be constant, and a place receiving high surface pressure will be generated and worn out. As a result, there was a defect that the diameter of the core rope narrowed and eventually broke.

On the other hand, the core of synthetic fiber is lighter and stronger than natural fiber, and there is no variation in the diameter of the core rope, and the twisted shape of the entire rope becomes a normal wire rope. Since the properties are poor and the amount of absorption is small, it disappears in a relatively short period of time and is not suitable for the use of a wire rope for a long period of time.

In order to solve these problems, as shown in FIG. 4, a hard fiber core 12 is arranged at the center of the wire rope 11 and a steel strand 13 is twisted around the outer peripheral surface of the hard fiber core 12 to form a core. A wire rope as a rope has been proposed (see, for example, Patent Document 1).

JP-A-8-74190

  However, the above-mentioned Patent Document 1 has a problem that the twisted steel wire 13 formed by twisting the outer periphery of the hard fiber core 12 is not flexible enough to bend.

The present invention has been researched and developed to solve the above problems, and is not a single core rope made of natural fibers or synthetic fibers, but a mixture of synthetic fiber spun yarns and synthetic fiber yarns. To provide a wire rope that is excellent in lubricating oil impregnation property, oil retention property, flexibility, fatigue resistance and that can be used over a long period of time, with little deformation of the wire rope, etc. It is intended.

As means for solving the above-mentioned problems and achieving the object, the present invention is a wire rope comprising a core rope impregnated with lubricating oil inside and a plurality of strands twisted around the outer periphery of the core rope. The core rope has developed and adopted a wire rope characterized by comprising an inner core twisted with synthetic fiber spun yarn and an outer core formed by twisting synthetic fiber yarn around the inner core. did.

According to the present invention, the core rope is formed in the composite layer of the inner core and the outer core, and the synthetic fiber spun yarn having a good impregnation property is used as the inner core. The lubricating oil can be leached over. In addition, since the inner core is covered with the outer core of the synthetic fiber yarn, a large amount of lubricating oil is controlled and oil retention is excellent. Furthermore, the core rope has a good shape-retaining property without causing shape loss because an inner core made of a spun yarn of synthetic fiber is arranged inside an outer core made of a synthetic fiber yarn . Moreover, since the diameter of the core rope becomes uniform and the diameter of the wire rope does not vary, there is no cause of local wear due to increased frictional resistance during use.

It is sectional drawing of the wire rope which shows embodiment of this invention. It is a simplified perspective view of a core rope. It is an expanded sectional view of a core rope. Cross section of conventional wire rope

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a wire rope showing an embodiment of the present invention, FIG. 2 is a simplified perspective view of the core rope before being incorporated into the central portion of the wire rope, and FIG. 3 is an enlarged cross-sectional view of the core rope. For example, a wire rope 1 having a structure of 8 × S (19) is used, and a core rope 2 arranged at the center and a plurality of strands 3 twisted around the outer peripheral surface of the core rope 2... 3 It consists of and.

The core rope 2 is a fiber core, and is formed by punching three synthetic fibers selected from polypropylene, polyethylene, polyester, polyamide, polyaramid, etc., which have no or very little water absorption. It is made.

The core rope 2 is composed of a mixed core rope with an outer core 2b formed by twisting synthetic fiber yarn around the outer periphery of an inner core 2a made of synthetic fiber spun yarn . The inner core 2a is formed by twisting seven polypropylene spun yarns, and the outer core 2b is formed by twisting seven polypropylene yarns on the outer peripheral surface thereof. And the strand 3 which twisted 19 steel wires was arranged on the outer peripheral surface of the core rope 2, and eight strands are arrange | positioned and twisted on the outer peripheral surface of the core rope 2, and the wire rope 1 is formed.

The use aspect of the wire rope 1 in the embodiment of the present invention configured as described above will be described together with the function and effect. When used as an elevator rope, it is formed by twisting seven polypropylene spun yarns constituting the core rope 2. Since the inner core 2a is a spun yarn and has fluff, the absorption of the lubricating oil is improved and the oil content is increased. Since the inner core 2a is twisted at the outer periphery with the outer core 2b of polypropylene yarn, even if a large tension is applied, the lubricating oil does not exude in large quantities, and it will be controlled and exuded in an appropriate amount. Oil can adhere to the strand for a long time, and it can prevent rusting, corrosion, and abrasion, and can maintain lubricity and flexibility.

Further, since the outer core 2b is formed by twisting seven polypropylene yarns, the outer core 2b is stronger and more durable than natural fibers and has an inner core 2a of polypropylene spun yarn inside. Thus, the shape retention of the core rope can be maintained over a long period of time when the lubricating oil oozes out.

Further, the core rope 2 is a mixed core rope composed of seven polypropylene spun yarn inner cores 2a and seven polypropylene yarn outer cores 2b, and the amount of lubricant impregnated and retained increases.

The embodiment of the present invention has been described above with the wire rope having an 8 × S (19) structure, but the present invention is not limited to this and may have various structures. Needless to say, various design changes can be made without departing from the scope of the present invention.

The present invention can be suitably used as wire ropes for elevators, lifts, cranes and the like.

1 Wire rope 2 Core rope 2a Internal core 2b External core 3 Strand

Claims (1)

A core rope impregnated with lubricating oil, and a wire rope composed of a plurality of strands twisted around the outer periphery of the core rope, wherein the core rope is an inner core obtained by twisting synthetic fiber spun yarn, A wire rope comprising an outer core obtained by twisting a synthetic fiber yarn around the outer periphery of the inner core.