JPH05278974A - Driven sheave for elevator - Google Patents

Abstract

PURPOSE:To prevent abrasion of wire ropes and sheaves by separating the driven sheaves, which are driven through the plurality of wire ropes being wound in a plurality of rope grooves, in a disk shape with the respective rope grooves in which the wire ropes are wound, and superposing respective disks side by side so as to be rotatable independently. CONSTITUTION:These driven sheave 3' are formed by supporting a plurality of disks 11, which have a rope groove 8 on the outer peripheral surface, with a shaft 10 so as to be rotatable freely through bearings 9 arranged at regular intervals by means of cylindrical rings 10, and the bearings are installed so as to be immovable in the shaft direction by means of bearing pressing nuts 13 arranged on both ends of the shaft 10. Intermediate parts of wire ropes 1, in which an elevator cage and a balance weight are connected to both ends, are wound in the rope grooves 8 of the respective disks 11. As for the wire ropes 1, since a difference is caused in a winding up quantity or a sending-out quantity due to the diametrical ununiformity or the ununiformity of a rope groove central system of the driven sheaves 3', though this difference appears as a difference in the number of revolutions of the respective disks 11, this difference is set to be absorbed by individual rotation of the respective disks 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator driven sheave.

[0002]

2. Description of the Related Art Generally, in an elevator, a car and a counterweight are suspended by a plurality of wire ropes via a driving sheave and a driven sheave, and the driven sheave is formed as an integral body. FIG. 4 is a schematic diagram of the structure of the elevator, and FIG. 5 is a sectional view of a conventional driven sheave. In the figure, 1 is a wire rope, 2 is a drive sheave around which the wire rope 1 is wound, 3,
Reference numerals 4 and 5 denote driven sheaves around which the wire rope 1 is wound and rotated by the drive sheave 2, 6 is a car, and 7 is a counterweight.

[0003]

By the way, since the driven sheave is made of an integral body and the number of revolutions of each rope groove is constant, the diameters of the plurality of wire ropes are not uniform when they are manufactured and the diameters of the ropes are uneven due to wear. Alternatively, the winding amount or the feeding amount of the wire rope varies depending on the unevenness of the center diameter of the rope groove at the time of manufacturing the driven sheave or the unevenness of the center diameter of the rope groove caused by abrasion of the rope groove.

Here, if the maximum diameter of the center groove of the driven sheave is D1 and the minimum diameter is D2, the difference L between the winding amount or the feeding amount of the wire rope when the driven sheave makes one rotation is L. = Π (D1-D2), where N is the total number of rotations of the driven sheave when the elevator rises from the bottom floor to the top floor, the difference LN in the amount of wire rope winding caused by the elevator rise is LN = π (D1-D2) N
As a result, a large amount of only a specific wire rope is entangled among multiple wire ropes, excessive tension is applied to the specific wire rope, and the life of the wire rope is shortened. However, there is a problem that wear of the wire rope and the rope groove is promoted.

The present invention has been made in view of the above-mentioned circumstances in the prior art, and its object is to wind and feed the wire rope due to the uneven diameter of the wire rope and the uneven center diameter of the rope groove of the driven sheave. An object of the present invention is to provide a driven sheave for an elevator, which can eliminate the difference in the amount and prevent the life of the wire rope and the wear of the rope groove from being prevented.

[0006]

In order to achieve the above object, the present invention is directed to an elevator follower driven by a drive sheave having a plurality of rope grooves via a plurality of wire ropes wound around the rope grooves. In the sheave, the driven sheave is constituted by separating the driven sheaves into discs for each rope groove around which the wire ropes are wound, and superposing the discs so that they can rotate independently.

[0007]

Since the present invention is configured as described above, the difference in the amount of winding and feeding of the wire rope due to the uneven diameter of the wire rope and the uneven center diameter of the rope groove of the driven sheave is different between the ropes of the driven sheave. It becomes the difference in the number of rotations of the car. As a result, there is no difference in the amount of wire rope entangled or fed out when the elevator is moved up or down, so there is no excessive tension applied to a specific wire rope, and there is no difference in the amount of entanglement or feeding. Wear of the wire rope and rope groove can also be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an elevator driven sheave according to the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of an elevator driven sheave according to the present invention, and FIGS. 2 and 3 are sectional views showing an application example of FIG. 1 to 3, the same parts as those shown in FIGS. 4 and 5 described above are designated by the same reference numerals. That is, 1 is a wire rope, 8 is a rope groove, 9 is a bearing, 10 is a shaft, 11 is a disk constituting a driven sheave made of cast iron, for example, 12 is a cylindrical ring interposed between the bearings 9 of the disk 11. , 13 are pressing nuts for the bearing 9.

A disk 11 which constitutes a driven sheave 3'of the present embodiment shown in FIG. 1 is provided with a rope groove 8 and is attached to a shaft 10 via a bearing 9, and the disk 11 is attached to a cylindrical ring 12.
Are attached to the shaft 10 with bearing bearing nuts 13 in a stacked manner. The disk 11 can be freely rotated by the bearings 9, respectively, and the difference in the winding amount and the sending amount of the wire rope caused by the uneven diameter of the wire rope and the uneven center diameter of the rope groove of the driven sheave 3'is caused. 3'is the difference in the number of revolutions of each disk 11,
There is no difference in the amount of wire rope that is wound or fed when the elevator is moved up or down, so excessive tension is not applied to a specific wire rope.
Wear of the wire rope and rope groove can also be prevented.

FIG. 2 shows another embodiment of the present invention, in which a disk 11 made of a press thin plate in which left and right symmetrical disks 14a and 14b are combined and fastened with a bolt 16 is constructed, and the effect thereof is the same as that described above.

FIG. 3 shows another embodiment of the present invention. Reference numeral 15a is a disk made of a press-molded product, 15b is a press-molded product for holding the bearing 9, and the disk 11 is fastened with bolts 16. And the effect is the same as described above.

[0013]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, the difference in the amount of wire rope winding and feeding due to the uneven diameter of the wire rope and the uneven center diameter of the rope groove of the driven sheave is different for each driven sheave. It becomes the difference in the number of rotations of the sheave. As a result, there is no difference in the amount of wire rope entangled or fed out when the elevator is moved up or down, so there is no excessive tension applied to a specific wire rope, and there is no difference in the amount of entanglement or feeding. Wear of the wire rope and rope groove can also be prevented.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a driven sheave for elevator of the present invention.

FIG. 2 is an explanatory diagram showing another embodiment of the present invention.

FIG. 3 is an explanatory diagram showing still another embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of an elevator.

FIG. 5 is a sectional view showing a conventional driven sheave.

[Explanation of symbols]

 1 wire rope 2 sheave 3 driven sheave 8 rope groove 11 disk

Claims (1)

[Claims] 1. In an elevator driven sheave driven by a drive sheave having a plurality of rope grooves via a plurality of wire ropes wound around the plurality of rope grooves, each wire rope is wound around the driven sheave. Separated into rope-shaped grooves for each rope,
A driven sheave for an elevator, characterized in that each disk is rotatably independent and is laminated.