JP2011157158A - Elevator device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevator device having a driving device of high safety, by making both compatible in traction performance and the rope service life required when applying a resin-covered rope of covering the rope outer periphery with resin superior in high friction and abrasion resistant such as polyurethane, to a main rope of a traction elevator. <P>SOLUTION: This elevator device includes a car, a counterweight, a wire rope for suspending-supporting the car and the counterweight, and a driving sheave wound with the wire rope, and is characterized in that the wire rope has a substantially circular cross section, and is covered in the outermost layer with an urethane resin, and the driving sheave is formed in a curved surface shape in an edge part of a cutout by arranging the undercut-shaped cutout in a bottom part of its groove. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a traction elevator device including a driving sheave having a groove structure suitable for a resin-coated rope.

  In recent years, for elevators for low-rise buildings, a structure without a machine room, which has a high degree of freedom in architectural design and can save space, is becoming common.

The structure of the main rope (main rope) conventionally used in the slidable type (traction type) elevator having a machine room structure is generally a fiber core structure defined in JIS B3525. In FIG. 8, an example of the cross section of the main rope 5 which has a fiber core is shown. In FIG. 8, the main rope 5 is composed of a strand 8, a strand 7 a obtained by twisting the strands 8, and a core rope 9 made of synthetic fiber or natural fiber. Or it has the structure where about 8 strands 7a are twisted. When tension is applied to the main rope 5, a force acts in a direction in which the strand 7 a compresses the core rope 9. With respect to the strength of the main rope 5, the strength grade is defined in the above-mentioned standard, and the wire 8 having a breaking load of about 1300 N / mm ^{2 to} 1900 N / mm ² is properly used depending on the grade.

  In recent years, a rope that is entirely covered with a resin has been proposed from the viewpoint of miniaturization of a drive system, improvement of rope life, and environmental harmony (see, for example, Patent Document 1). FIG. 9 shows a cross-sectional view of a resin-coated rope 5a as a typical example of such a proposal. In FIG. 9, a resin-coated rope 5a is composed of a strand 11a having a coating 12 on its surface, and a strand formed by twisting the strand 11a and individually coated with a coating 14 made of polyethylene, polyurethane, or the like. 13 and the strand 13, similarly to the strand 13, is formed by twisting individually coated strands 1lb, the core 15 covered with a covering material such as polyethylene or polyurethane, and the covering formed of polyurethane provided on the outer periphery of the rope The resin 10 is used. In the resin-coated rope 5a, the contact pressure between the strands is relaxed by the individual coatings 12 of the strands 11. Further, since the entire circumference of the resin-coated rope 5a is covered with urethane or the like, the contact pressure with the driving sheave can be kept low, and the load during use can be reduced as compared with the conventional wire rope, and the life can be improved. .

  The downsizing of the drive system depends on the rope life. In miniaturization, it is important to reduce hoisting machines and suspension wheels including drive sheaves that are drive mechanisms, but these miniaturizations increase the bending stress generated in the main rope and reduce the fatigue life. Therefore, in the domestic regulations (e.g., Building Standard Law) that define the structure of elevators, the ratio (D / d) of the driving sheave or suspension wheel diameter (sheave diameter) D to the main rope diameter d is not less than 40. I am going to do that.

  However, the damage to the rope is not only due to bending stress, but also due to friction between the strands and between the strands and the sheave surface. For this reason, by using the resin-coated rope, it is possible to reduce the load caused by these frictions, and it is possible to ensure the same life as a conventional rope even if the drive sheave or the suspension wheel is downsized.

  In addition, since the resin-coated rope does not use grease for lubrication, there is no lubrication during maintenance, no contamination due to grease occurs, and no waste oil treatment is required, so the environmental load is reduced.

  In many resin-coated ropes used for traction elevators, polyurethane having both wear resistance and a high friction coefficient necessary for obtaining traction (driving force) is often used as the resin covering the outer periphery. In general traction elevators, the combination of a wire rope and an iron drive sheave ensures the traction performance, so the groove structure of the drive sheave has an undercut groove with a groove bottom notched to increase contact pressure and a wedge effect. Therefore, it is necessary to use a V-groove whose contact pressure is increased by the above. Resin-coated rope with a polyurethane coating on the surface has a high friction coefficient, so even if it is a U-shaped groove with a curvature close to the nominal diameter of the rope, the required traction performance can be obtained. is there.

Japanese Patent No. 3724322 (page 15, FIG. 6)

  However, when the polyurethane covering the surface is dropped due to fire or deterioration over time, the inner wire rope directly contacts the groove of the drive sheave, so the traction performance decreases in the general U groove and the load of the elevator Depending on the condition, slipping may occur. On the other hand, when the groove of the drive sheave is a V groove, the required traction performance can be obtained even if the urethane coating is removed. However, when the V-groove is combined with a urethane-coated rope, the load on the polyurethane coating is high, the coating is destroyed very early, and the function of holding the internal wire rope is lost.

  Therefore, when a polyurethane-coated rope is applied to a traction elevator, it must have a groove structure that ensures traction performance under an assumed use condition and provides an appropriate rope life.

  However, there is no proposal for such a groove structure suitable for a urethane-coated rope.

  The present invention has been made in view of the above problems, and its purpose is to apply a resin-coated rope whose outer periphery is covered with a resin having high friction and wear resistance, such as polyurethane, to a rope (main rope) of a traction elevator. It is an object of the present invention to provide an elevator apparatus equipped with a highly safe driving device that achieves both necessary traction performance and rope life.

  According to the elevator apparatus of the present invention, there is provided a car ride, a counterweight, a wire rope for suspending the car and the counterweight, and a driving sheave around which the wire rope is wound. The rope has a substantially circular cross section, and the outermost layer is covered with urethane resin. The drive sheave is provided with an undercut notch at the bottom of the groove, and the edge portion of the notch is curved. An elevator apparatus having a shape is provided.

  Thereby, required traction performance and rope life can be made compatible.

  Further, according to the elevator apparatus of the present invention, the undercut notch provided in the bottom of the groove is relative to the nominal diameter of the inner rope whose outer shape is the outermost strand portion when the resin coating is removed. An elevator apparatus is provided that is dimensioned to have an angle of approximately 95-105 ° when the inner rope contacts the groove surface.

  Further, according to the elevator apparatus of the present invention, the contact angle of the curved surface portion matched with the nominal diameter of the inner rope is approximately 20 to 30 ° in the vicinity of the edge of the undercut notch provided at the bottom of the groove. An elevator apparatus is provided.

  Thereby, even when the resin-coated rope falls off, the necessary traction performance can be maintained.

  Further, according to the elevator apparatus of the present invention, there is provided an elevator apparatus in which the material of the groove is an iron material and the surface of the groove is subjected to diamond-like carbon (DLC) coating.

  Thereby, the wear resistance of the groove can be improved.

  In traction elevators that use resin-coated ropes, a highly safe drive that achieves both the required traction performance and rope life, and can ensure the required traction performance even when the surface resin of the rope is missing. An elevator apparatus including the apparatus can be provided.

The traction elevator schematic diagram of the present invention. Sectional drawing which shows the state in which the resin-coated rope in the elevator apparatus of this invention was wound around the drive sheave groove | channel. Sectional drawing which shows the state in which the rope at the time of the coating | coated removal of the resin-coated rope in the elevator apparatus of this invention was wound around the drive sheave groove. Schematic for demonstrating the traction performance of this invention. The relationship figure of a friction distance and a rope friction coefficient. Sectional drawing when wear resistant coating DLC is applied to the drive sheave groove surface of the present invention. The state figure at the time of using abrasion-resistant coating DLC with a wire rope and a cast iron groove. Sectional drawing of the conventional fiber core wire rope. Sectional drawing of the conventional resin-coated rope.

  Hereinafter, an elevator apparatus according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic view showing a slewing type (traction type) elevator apparatus having a machine room-less structure according to this embodiment.

  As shown in FIG. 1, the elevator apparatus of the present embodiment includes a car 1, a counterweight 2, suspension vehicles 3a and 3b attached to the upper parts of the car 1 and the counterweight 2, respectively, and a hoisting machine ( It comprises a driving sheave 4, a main rope 5, and a hoistway 6 that are provided in a not-shown). One end of the main rope 5 is fixed to the upper part of the hoistway 6, the suspension wheel 3 a of the car 1, the driving sheave 4, the suspension wheel 3 b of the counterweight 2 are routed in this order, and the other end is again connected to the hoistway 6. It is fixed at the top. As a result, the difference between the tension on the car 1 side and the tension on the counterweight 2 side of the main rope 5 and the frictional force generated between the driving sheave 4 and the main rope 5 are balanced, and the counterweight 2 and the car 2 are balanced. Are driven in a slidable manner.

  By using a drive sheave suitable for the resin-coated rope described later for such an elevator device, both the required traction performance and the rope life are compatible, and it is necessary even when the surface resin of the rope is missing. It is possible to provide an elevator apparatus equipped with a highly safe drive device that can ensure a good traction performance.

  Below, the Example of the groove structure of a driving sheave is described in detail with reference to drawings.

  FIG. 2 is a cross-sectional view showing a state in which the resin-coated rope in the elevator apparatus according to the embodiment of the present invention is wound around the sheave groove of the driving sheave.

  In FIG. 2, 16 is a sheave groove, 17 is a resin-coated rope, and the resin-coated rope 17 includes, for example, an inner wire rope 19 having a steel core 20 around which a strand 21 is disposed, and a surface of the inner wire rope 19. The steel core 20 is covered with a cushioning material 22 for relaxing the contact pressure with the strand 21. The sheave groove 16 is provided with a curved surface 23 that conforms to the nominal diameter of the internal wire rope 19, and when the polyurethane coating 18 on the surface falls off, the internal wire rope 19 is fitted into the curved surface 23 portion by load tension. An undercut notch 24 is provided at the bottom of the sheave groove 16. Each edge portion 25 on the groove side has a curved surface shape in order to reduce the aggressiveness of the resin-coated rope 17 to the polyurethane side.

  FIG. 3 is a cross-sectional view showing a state in which the rope when the resin-coated rope is removed from the drive sheave groove in the elevator apparatus according to the embodiment of the present invention.

  The curved surface 23 portion is configured to be approximately 125 to 145 ° as a contact angle α with the internal wire rope 19. Further, the notch 24 is configured with an undercut angle β of 85 to 105 °.

As shown in FIG. 4, when the main rope 5 is wound around the sheave, the traction ratio ν is defined as a groove coefficient κ, a friction coefficient μ, and a rope winding angle θ.
ν = exp {κ · μ · θ} (1)
It is represented by

で表される。 The groove coefficient κ is determined from the contact angle α between the sheave groove and the wire rope, and the undercut angle β.

It is represented by

  In this embodiment, the rope winding angle θ is approximately 130 to 180 °.

  As for the friction coefficient μ, FIG. 5 shows an example of the test result of the friction coefficient corresponding to the friction distance.

  In the test results, the friction coefficient μ varies depending on the wear and lubrication state, but in the resin-coated rope, it is considered that the outer layer wear of the inner wire rope is small when the polyurethane coating is dropped, and is about 0.11 to 0.14.

  A general traction elevator requires a traction ratio of 1.8 or more. However, according to the groove structure in the present invention, that is, the contact angle α and the undercut angle β, the traction ratio required in combination with the internal rope. Can be secured.

  In the case of the groove structure described above, a new rope covered with polyurethane resin has a structure similar to an undercut of about 70 to 105 °, but the undercut edge portion is a curved surface and contacts near the edge. Since the pressure is relaxed, the load on the polyurethane coating is reduced, and according to the evaluation by the inventors, an improvement of about 1.3 times is seen in the number of loads leading to the destruction of the coating compared to the V-groove structure. ing.

  The abrasion resistance of polyurethane is extremely excellent even in combination with an iron material, and depending on conditions, wear on the iron material side may precede, and the cross-sectional shape of the groove may change, making it impossible to obtain a necessary contact state.

  Therefore, it is desirable to apply a diamond-like carbon (DLC) coating 26 to the groove surface as shown in FIG. In general, the DLC coating is often used as a surface coating material to improve the wear resistance of the friction portion.

  However, in the combination of a general wire rope and an iron sheave groove, the hardness on the groove side is lower than the hardness of the rope strand, and as shown in FIG. The DLC layer is repeatedly bent and deformed, resulting in insufficient durability and little improvement in wear resistance.

  On the other hand, in combination with a polyurethane-coated rope, the contact pressure is low, and the deformation on the groove side is extremely small, so there is no deterioration of the DLC layer, and the groove side can be protected against friction caused by polyurethane and the shape can be maintained. .

  2 and 3, an 8-strand seal rope having a steel core (IWRC), that is, IWRC8 × S (19) (7 × 7 + 8 × S [l + 9 + 9]) is added with a blade and a urethane coating. However, the same effect can be obtained with other configurations such as an IWRC rope (7 × 7 + 8 × W [l + 6 + (6 + 6)]) having an 8-strand Warrington configuration.

  As described above, the main components and effects of the groove structure in the embodiment of the present invention have been described, but it is needless to say that the present invention is not limited to this embodiment.

DESCRIPTION OF SYMBOLS 1 ... Riding car 2 ... Balance weight 3a, 3b ... Suspension wheel 4 ... Drive sheave 5 ... Main rope (main rope)
6 ... Hoistway 7a, 7b, 7c, 13, 21 ... Strand 8 ... Wire 9 ... Core rope (fiber core)
DESCRIPTION OF SYMBOLS 10, 18 ... Polyurethane coating 11 ... Coated strand 12 ... Strand coating 14 ... Strand coating 15, 20 ... Steel core 16 ... Sheave groove (sheave groove)
17 ... Resin coated rope 19 ... Internal wire rope 22 ... Buffer material 23 ... Curved portion 24 ... Undercut portion 25 ... Edge portion 26 ... DLC coating α ... Contact angle β ... Undercut angle θ ... Winding angle μ ... Friction coefficient

Claims (4)

A car rope, a counterweight, a wire rope that holds the countercar and the counterweight, and a drive sheave on which the wire rope is wound,
The wire rope has a substantially circular cross section, and the outermost layer is coated with urethane resin,
The drive sheave is provided with an undercut notch at the bottom of the groove, and an edge portion of the notch has a curved shape.   The undercut notch provided at the bottom of the groove is against the nominal diameter of the inner rope whose outer shape is the outermost strand portion when the resin coating is removed, when the inner rope is in contact with the groove surface, The elevator apparatus according to claim 1, wherein the elevator apparatus has a dimension of approximately 95 to 105 °.   2. A curved surface portion matched with the nominal diameter of the inner rope is provided in the vicinity of the edge of the undercut notch provided at the bottom of the groove over a range of approximately 20 to 30 degrees as a contact angle. Or the elevator apparatus of Claim 2.   The elevator apparatus according to any one of claims 1 to 3, wherein a material of the groove is an iron material, and a diamond-like carbon (DLC) coating is applied to a surface of the groove.

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