JP2017222430A - Governor rope of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the contamination of a governor rope caused by grease, and the adhesion of foreign matters, and to suppress the contraction of a rope diameter of the governor rope for a long period of time.SOLUTION: A governor rope 1 used in a governor mechanism of an elevator is constituted by intertwining eight pieces of strands 22 to a periphery of a solid core material 21 which is formed by extrusion-molding high-density polyethylene. Each strand 22 is constituted by intertwining first, second and third element wires 24, 25 and 26, and the element wires 24, 25 and 26 have galvanized layers on their surfaces. Since the governor rope 1 is used in a hoistway without grease, contamination caused by the grease and the lowering of friction resistance do not occur. By combining the rope and the plated layers, the abrupt wear of the core material 21 caused by the intrusion of particles of rust generated at the element wires 24, 25 and 26 into an interface with the synthetic resin-made core material 21 is suppressed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a governor rope that is wound between an elevator governor sheave and a tension sheave.

  As is well known, the elevator is equipped with a governor mechanism for safety when the car becomes abnormally fast. A governor rope is wound endlessly between the governor sheave of the governor arranged at the top of the hoistway and the tension sheave arranged in the pit at the bottom, and this governor rope is connected to an emergency stop device on the car side. ing. Therefore, the governor sheave rotates at a rotational speed corresponding to the moving speed of the car. When the speed of the governor sheave (that is, the speed of the car) exceeds the speed of the first stage, the governor operates the so-called overspeed switch to shut off the power of the hoist and further exceeds the speed of the second stage. In this case, the cage-side emergency stop device is operated by restraining the governor rope.

  Conventional governor ropes generally have a structure in which a plurality of strands are twisted around the fiber core, and by adding grease-like oil to the fiber core, the corrosion (rusting) of the strands made of iron-based material. Occurrence).

  On the other hand, Patent Document 1 discloses a wire rope having a structure in which a rod-shaped synthetic resin is used for a rope core and a plurality of strands made of metal strands are twisted around the rope core as a cable rope for a ski lift or the like. It is disclosed.

Japanese Utility Model Publication No. 6-22398

  In the conventional governor rope, the oil contained in the fiber core is exposed on the rope surface and solidifies due to secular change, so that it becomes a kind of foreign matter such as dust and is attached to the rope surface. There is a possibility that the smooth operation of the governor may be impaired by the solidified foreign matter adhering to the rope surface.

  In addition, as the oil contained in the fiber core decreases, the density of the fiber core decreases and the rope diameter decreases. If the diameter of the governor rope is excessively reduced, the gripping force may be reduced when the governor attempts to grip and restrain the governor rope at an excessive speed.

  On the other hand, in the wire rope disclosed in Patent Document 1, if it is used without oil and fat, rust (iron oxide) is inevitably generated in the strands, and the generated rust particles are a synthetic resin rope. As a result of the penetration between the surface of the core and the strand, there arises a problem that the wear of the rope core and the decrease in the rope diameter proceed rapidly. In addition, there is a problem that abrasion powder is generated due to wear of the synthetic resin material of the rope core caused by the rust particles, and this abrasion powder adheres to the governor.

  The present invention is a governor rope that is wound between an elevator governor sheave and a tension sheave, and is formed by twisting a plurality of strands around a solid core made of synthetic resin. The element wire comprises a corrosion-resistant plating layer on the surface, and is characterized by being used without oils and fats.

Preferably, the core material is made of high density polyethylene. Preferably, high density polyethylene having physical properties of a density of 0.90 to 0.97 g / cm ³ , a Shore hardness D50 to D70, and a flexural modulus of 750 to 900 MPa is used.

  Preferably, the anticorrosion plating layer is a zinc plating layer or an aluminum zinc alloy plating layer.

  In one example, eight strands are arranged around the core material in a state where adjacent strands are in contact with each other.

  In such a governor rope, since it is used without oil and fat in the hoistway, there is no generation of foreign matter due to aging of the oil and fat. And since the core is made of solid resin such as high-density polyethylene, even if it is repeatedly bent by the governor and tension sheave, the rope length does not increase over time, and the rope diameter decreases. Less is. And since the surface of the strand is provided with a corrosion-resistant plating layer, even if it is oil-free, the surface of the strand is not rusted and rust particles enter the contact surface between the strand and the synthetic resin core material. As a result, there is no sudden wear of the synthetic resin core material and no rapid rope diameter reduction.

  According to the present invention, it is possible to avoid the governor rope from being soiled or adhered to foreign matters due to the secular change of oil, and to suppress the decrease in the rope diameter of the governor rope over a long period of time. Therefore, the operation of the governor and the emergency stop device when the car is overspeed can be obtained more reliably.

Explanatory drawing of the whole governor mechanism of an elevator. FIG. Sectional drawing of the governor rope of one Example of this invention. The characteristic view which shows the elongation of the governor rope with respect to repeated bending. The characteristic view which shows the reduction | decrease of the rope diameter of the governor rope with respect to repeated bending.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an example of the overall configuration of an elevator governor mechanism in which a governor rope 1 according to the present invention is used. The elevator in the illustrated example is a traction type elevator, and the car 2 is suspended in a hoistway via a main rope (not shown) and is moved up and down by a counterweight and a hoisting machine (not shown). A governor 3 provided with a governor sheave 4 is provided in a machine room at the upper part of the hoistway, and a tension sheave 5 is disposed in a pit at the lower part of the hoistway, and between these governor sheave 4 and the tension sheave 5, A governor rope 1 is wound endlessly. Both ends of the governor rope 1 are connected to the car 2 via the hitch 6. Accordingly, the governor rope 1 moves as the car 2 moves up and down, and the governor sheave 4 rotates. The tension sheave 5 applies a predetermined tension to the governor rope 1 using a weight (not shown).

  The hitch 6 is linked to an emergency stop device 7 on the car 2 side. The emergency stop device 7 is operated by a link mechanism 8 linked to the hitch 6, a lifting rod 9 pulled up by the link mechanism 8, and a lifting of the lifting rod 9, and gives a braking force to a guide rail (not shown). A wedge mechanism (not shown).

  FIG. 2 shows an example of the configuration of the governor 3. The governor sheave 4 around which the governor rope 1 is wound has a pair of flyweights 11 that move to the outer peripheral side according to the rotational speed. A rope grip tripper 12 is disposed so as to interfere with the flyweight 11 when the rotational speed of the governor sheave 4 reaches a rotational speed corresponding to the second stage overspeed state. Further, a fixed jaw 15 supported by a spring 16 so as to grip the governor rope 1 from both sides, and a movable jaw 14 supported so as to swing up and down by an arm 17 are provided. The movable jaw 14 is normally locked to the lever 13 and is in a position that swings upward. The lever 13 is configured to swing in conjunction with the rope grip tripper 12.

  Further, the governor 3 is provided with an unillustrated overspeed switch that operates when the rotational speed of the governor sheave 4 reaches a rotational speed corresponding to the first-stage overspeed state on the back surface side (not illustrated).

  When the moving speed of the car 2 is in the first stage overspeed state, an overspeed switch (not shown) is activated, and the power supply of the winder (not shown) is shut off. Further, when the lowering speed of the car 2 is in the second stage overspeed state, the flyweight 11 moved to the outer peripheral side comes into contact with the rope grip tripper 12, and the tripper 12 swings the lever 13 outward. As a result, the lever 13 and the movable jaw 14 are disengaged, the movable jaw 14 is lowered, and the governor rope 1 is restrained with the fixed jaw 15.

  Since the car 2 is going to further descend in a state where the governor rope 1 is constrained in this way, the lifting rod 9 of the emergency stop device 7 is lifted upward via the link mechanism 8 and a wedge mechanism (not shown) is activated. The wedge mechanism clamps a guide rail (not shown) from both sides and brakes the descending of the car 2.

  Thus, the governor mechanism is very important as an elevator safety mechanism, and the governor rope 1 is one of the main components. The governor rope 1 is repeatedly bent at both the governor sheave 4 and the tension sheave 5 as the car 2 is raised and lowered.

  FIG. 3 shows a cross section of one embodiment of the governor rope 1 according to the present invention. As shown in the figure, the governor rope 1 is formed by twisting a plurality of, for example, eight strands 22 around a solid core material 21 made of synthetic resin. The twist direction of the governor rope 1 of the embodiment is, for example, Z twist, and the twist direction of the entire rope is the same as the twist direction of each strand 22.

The core material 21 is formed by continuously extruding a comparatively hard synthetic resin material into a rod having a circular cross section, and the surface portion of the core material 21 has a strand 22 as shown in FIG. It is in a state of biting into the gap between them. The core material 21 is preferably made of a hard synthetic resin that is less stretched by tension and less worn by the strands 22, and for example, high-density polyethylene is used. Desirably, high density polyethylene having physical properties of a density of 0.90 to 0.97 g / cm ³ , a Shore hardness D50 to D70, and a flexural modulus of 750 to 900 MPa is used.

  The strand 22 is formed by twisting strands made of steel, for example, one first strand 24 having a large diameter located at the center and nine second strands having a large diameter located at the outer periphery. Nine small diameters arranged between the first strand 24 and the second strand 25 so as to fill the gap between the wire 25 and the two second strands 25 adjacent to each other. The third strand 26 is combined. These strands 24, 25, and 26 are twisted together as a parallel twist.

  As a specific numerical example, the overall rope diameter of the governor rope 1 is 8 mm, the diameter of the first strand 24 is 0.61 mm, the diameter of the second strand 25 is 0.52 mm, The diameter of the third strand 26 is 0.30 mm.

And each of said strand 24, 25, 26 is previously equipped with the corrosion-resistant plating layer on the surface. The anticorrosion plating layer is preferably composed of a zinc plating layer or an aluminum zinc alloy plating layer. The film thickness of the plating layer is controlled by the amount of plating attached. For example, in the case of a galvanized layer, the amount of attachment is preferably 40 g / mm ² or more.

  In the present invention, the specific configuration of the strand 22 is not limited to the above embodiment, and the strand 22 having various configurations can be used. Further, the number of strands 22 is not limited to eight, and may be configured such that other numbers of strands 22 such as six are twisted together.

  The governor rope 1 configured as described above is used in the hoistway of the elevator described above without containing oil such as grease. That is, the governor rope 1 of the present invention is used in the governor mechanism without oil.

  Thus, since the governor rope 1 is used without containing fats and oils, the governor mechanism is not soiled by the fats and oils and the friction coefficient of the governor rope 1 with respect to the governor mechanism is not reduced. Moreover, there is no possibility that the fats and oils solidify over time and cause foreign matters.

  And compared with the governor rope using the conventional fiber core, there are few elongations and the reduction | decrease of a rope diameter accompanying the repeated bending in the sheaves 4 and 5. FIG. FIG. 4 shows the elongation of the rope with respect to repeated bending in comparison with the governor rope 1 of the above example and the comparative example. The comparative example is a governor rope using a fiber core containing a conventional grease. is there. FIG. 5 similarly shows a change in the rope diameter with respect to repeated bending in comparison with the above comparative example. As shown in FIG. 4 and FIG. 5, the above-described governor rope 1 used with oil-free fat using high-density polyethylene as the core material 21 is compared with a governor rope using a fiber core containing conventional grease. There is little elongation and there is little decrease in rope diameter over time.

  On the other hand, in the above governor rope 1, since the strands 24, 25, and 26 have a corrosion-resistant plating layer on the surface, no rust (iron oxide) is generated on the surface even when used without oil in the hoistway. . Therefore, rust particles do not enter the contact surface between the strand 22 and the synthetic resin core material 21 to promote wear of the core material 21, and generation of wear powder due to wear of the core material 21 is suppressed.

  That is, if the strands 24, 25, and 26 do not have a corrosion-resistant plating layer, rust is generated over time on the surfaces of the strands 24, 25, and 26 when used without oil. The rust is eventually separated from the surfaces of the strands 24, 25, and 26 as rust particles, and enters the contact surface (interface) between the strand 22 and the synthetic resin core material 21. The rust particles have a higher hardness than the synthetic resin material (for example, high-density polyethylene) of the core material 21, and are highly aggressive against the synthetic resin core material 21. Therefore, when rust particles enter the interface between the strands 22 and the synthetic resin core material 21, the rust particles act as a kind of abrasive and are repeatedly bent by the sheaves 4 and 5, so that the synthetic resin core material is added. 21 wear progresses rapidly. The wear of the core 21 reduces the rope diameter, and when the governor 3 tries to restrain the governor rope 1 at an excessive speed, the gripping force by the fixed jaw 15 and the movable jaw 14 tends to decrease.

  According to the governor rope 1 of the above embodiment, the decrease in the rope diameter due to the occurrence of such rust is reliably suppressed. Therefore, the operation of the governor 3 and the emergency stop device 7 at the time of overspeed can be obtained more reliably over a long period of time.

  In the present invention, “oil-free” means that active addition of grease such as grease is not performed. For example, rust preventive oil previously attached to the strands 24, 25, and 26 at the time of rope manufacture is used. It does not mean that it must be actively cleaned and removed.

DESCRIPTION OF SYMBOLS 1 ... Governor rope 2 ... Basket 3 ... Governor 4 ... Governor sheave 5 ... Tension sheave 7 ... Emergency stop device 14 ... Movable jaw 15 ... Fixed jaw 21 ... Fixed material 22 ... Strand 24, 25, 26 ... Strand

Claims (5)

A governor rope wound between the governor sheave and tension sheave of the elevator,
Around the solid core material made of synthetic resin, it is composed by twisting multiple strands,
The strands constituting each strand have a corrosion-resistant plating layer on the surface,
An elevator governor rope characterized by being used without oils and fats.   The elevator governor rope according to claim 1, wherein the core material is formed of high-density polyethylene. ^3. The elevator governor rope according to claim 2, wherein the high-density polyethylene has a density of 0.90 to 0.97 g / cm ³ , a Shore hardness D50 to D70, and a flexural modulus of 750 to 900 MPa.   The elevator governor rope according to any one of claims 1 to 3, wherein the anticorrosion plating layer is a zinc plating layer or an aluminum zinc alloy plating layer.   The elevator governor rope according to any one of claims 1 to 4, wherein eight strands are arranged around the core material in a state where adjacent strands are in contact with each other.

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