FI110507B - Elevator suspension and hoisting rope arrangement - The suspension ropes from car and counterweight pass over diverters, the hoist ropes from the top of the counterweight pass over traction pulley and diverter to the its lower face - Google Patents

Abstract

Suspension ropes (3) attached to the top of elevator car (1) pass over diverting pulleys (4) to counterweight (2), the hoisting rope attached to the counterweight is passed over traction sheave (7) down to and around diverting pulleys (8) and up to counterweight underside, where the hoisting rope is formed of synthetic materials. The hoisting ropes has a structure consisting of a number of bundles of synthetic fibres (pref. aramid fibres) positioned side by side and separated from each other all sheathed in a plastic material (pref. polyurethane) such that the rope cross section has a greater width than thickness.

Description

110507

LIFT ROPE ARRANGEMENT

The present invention relates to a first elevator rope arrangement according to claim 1 and to a second elevator rope arrangement according to claim 5.

In the traction sheaves, the elevator car and counterweight are hung on round steel ropes. Normally, the same ropes serve as both support ropes to support the elevator car and counterweight and lifting ropes that move the elevator car and counterweight. In this case, the ropes must be dimensioned according to the total load to be carried, even if the force needed to move the elevator is very small in the extreme case of counterweight, almost zero when the counterweight and the elevator car with its load are equal.

There are also known solutions in which the supporting ropes and the lifting ropes are separate. Such an elevator is disclosed, for example, in U.S. Patent No. 5,398,781. The lift according to that patent has a rope attached to the upper part of the elevator car and guided via folding wheels to a ··· lever arm. The lifting rope is fastened either to the lower or upper part of the elevator car and guided to the counterweight: 25 lever members via the folding wheels and the drive wheel of the lifting gear. For the stretching of the ropes, it is necessary. a lever member acting as a clamping device adapted to the counterweight. The patented solution specifically focuses on tensioning the hoisting rope, and no details of the hoisting ropes or the ropes are mentioned. Likewise, no advantages have been disclosed which could be obtained in particular by the separation of lifting and carrying ropes.

Prior art is also described in U.S. Patent •; 35 811513, known as a rope arrangement for an elevator, wherein a counterweight is provided to the rope moving the car * · so that the 2 110507 rope mentioned above is guided from an anchorage point above the counterweight through an upper wheel and thence attachment points. Above the counterweight mentioned above, a second rope is arranged to pass through the other overhead folding wheels to the attachment point on the roof of the body. The rope arrangement disclosed in this publication also has a second counterweight 10 attached to the body, which is guided by its own rope through its own folding pulleys to the attachment point above the body. In addition, in this rope arrangement, the motor operating the elevator is located in the lower part of the arrangement and the motor is connected to the traction sheave via a worm gear 15.

Generally, steel ropes are used as lifting ropes, but their coefficient of friction with metal traction sheaves is so low that it has to be increased, for example, by various tensioning of the traction sheaves or by increasing the rope's contact angle; In addition, the steel lifting rope acts as a kind of sound bridge between the lift motor drive and · * ·: the elevator car, leading the hoisting machine noises to the elevator car and thus impairing ride comfort.

25

Further, a disadvantage of prior art solutions using a steel lifting rope is that the rope has a larger bending radius, which requires a large diameter on the traction and pulleys.

The object of the present invention is to eliminate the drawbacks of the prior art ____ and to provide a new type of elevator rope arrangement, /; in which the lift ropes are divided into two parts: (a) suspension ropes for the purpose of connecting and supporting the elevator car and the counterweight (35), and (b) lifting ropes / ropes (3 110507) for receiving the counterweight and imbalance between the elevator car and the load as well as moving the elevator car.

5 There is now no need to worry about friction on the support ropes, so they can be made of steel ropes. Instead, thin artificial ropes are used as lifting ropes in which the strength of the structure is formed by longitudinal strands made of, for example, aramid fibers. These strands are surrounded by 10 sheaths which bind each rope together into one unit and provide a good coefficient of friction against the drive wheel. The material of the jacket is, for example, polyurethane, which gives a multiple coefficient of friction compared to, for example, steel rope.

The first elevator rope arrangement according to the invention is characterized in detail by what is stated in the preamble of claim 1. Further, the second elevator rope arrangement according to the invention is characterized in what is stated in the preamble of claim 2. The features of some other embodiments of the invention will be apparent from the dependent claims.

Lifting ropes now carry only a fraction of the load on the elevator, since they do not need to support the load caused by the elevator car, the people being transported or the goods and counterweight.

As a result, the elevator rope according to the invention can be made very thin with a small bending radius.

: / · The lifting rope can also be made flat, whereby the jacket of the lifting rope 30 is planar and thus the cross-section of the lifting rope is substantially larger than its thickness.

_ ·· Thanks to the thin and / or flat lifting rope, it is now possible to use a “traction sheave that is considerably smaller and lighter than the 35 traction sheaves currently in use”. In this case, the torque required to move the 4 110507 elevator car is also small, which means that a small and inexpensive lifting motor can be used. In addition, the jacket of the hoisting rope is easily coated with various materials, whereby the friction and wear properties can be optimized for different drive wheel materials. Similarly, due to its small motor and compact traction sheave, the elevator is well suited for a machine-free elevator where the hoisting motor and traction sheave fit well into the elevator shaft.

10

The invention will now be described in more detail by way of example with reference to the accompanying drawings, in which Fig. 1 shows an elevator rope assembly according to the invention, Fig. 2 shows a lifting rope suitable for an elevator arrangement according to the invention.

Fig. 1 is a very simplified view of a traction sheave elevator according to the invention, in which the elevator car 1 and the counterweight 2 are suspended from the supporting ropes 3 along their rails in the elevator shaft. The steel supporting ropes 3 are secured to the upper part of the elevator car 1 and guided via the folding wheel V 25 to the counterweight 2.

Similarly, substantially thin, flexible lifting ropes 5 for moving the elevator car 1 and counterweight 2, which are substantially thin with respect to the supporting ropes 3, are fastened at their first end 30 to the upper portion of the counterweight 2 from which the ropes are guided. down to the diverting wheel 8 at the bottom of the elevator shaft * *, which, after being rotated, the lifting ropes rise again and finally engage the second runner 35 to reach the lower part of the counterweight 2. Instead of being connected to counterweight 2 110507, the hoisting ropes 5 may be attached to the elevator car 1. The hoisting ropes 5 may be several thin in parallel, but one flat hoisting rope may equally suit.

5 The drive mechanism is, for example, a disc-shaped electric motor with a flat diameter, the rotor of which is integrated with a traction sheave and in which the diameter of the stator and the rotor is larger than the diameter of the traction sheave 7. The drive is located at the top of the elevator shaft in the space between the elevator car 1 and the side wall 10 of the shaft.

The lifting ropes are tensioned on the drive wheel 7 by means of a diverting wheel 8. Tensioning is effected by means of a tensioning spring 9 which pulls the diverting pulley 8 so that the lifting ropes 5 always remain on the traction sheave 7 sufficiently tight for the friction required, despite the stretching of the lifting ropes 5. The clamping spring may also be replaced by a clamping weight.

Figure 2 shows a substantially flat elevator hoisting rope 5 used in a suspension solution 20 according to the invention. It has six bundles of threads 12a to 12e disposed on the same plane.

The aforementioned strand bundles 12a to 12e consist of load-bearing strands 13. These longitudinal strands forming the strength of the rope structure are made of synthetic fibers, for example, aramid fibers. These strands are surrounded by a sheath 14 which binds the strands together into a single unit and provides a good friction coefficient against the drive wheel. The strand bundles 12a-12f are disposed side-by-side so that the sheath 14 is planar and the width of the rope is significantly greater than its thickness.

The material of the sheath 14 is, for example, polyurethane, which gives a multiple of the friction coefficient compared to steel rope. If necessary, the surface of the sheath can be coated with various materials. In this case, the friction and wear properties of the coating 15 can be optimized for different types. * · 35 for traction sheave materials. The strand bundles have a circular cross-section of 6 110507 in Figure 2, but are of course selectable according to the application.

When using thin discrete lifting ropes, the strands 12a - 12f 5 are spaced apart so that they function in the same way as stand-alone lifting ropes independently of the other strands.

It will be apparent to one skilled in the art that the various embodiments of the invention are not limited to the example 10 described above, but may vary within the scope of the following claims. Thus, the lifting rope of the elevator need not necessarily be circular or flat in cross-section, but for example a V-shaped lifting rope of the V-belt type, whereby the traction sheave 15 is able to obtain very high friction between each rope and the traction sheave. Similarly, the support ropes can be man-made ropes and may consist of many parallel ropes or just one flat rope. Also, the suspension ratio may be something other than the 1: 1 suspension shown in the example.

Claims (5)

1. Liner arrangement in an elevator, where the elevator basket (1) and the counterweight (2) running along guides in the elevator shaft are suspended in support lines (3), where the support lines (3) are attached to the upper part of the elevator basket (1) and run via the eating minimum a break plate (4) to the counterweight (2), and at least one carrier line (5) is guided via at least one break plate (8) so that it can move the lift basket (1) and the counterweight (2), the first of the carrier line (5) is also attached to the counterweight (2), characterized in that the carrier line (5) is guided from the attachment point in the counterweight (2) around a drive disk (7) and therefrom at the upper part of the elevator shaft in the space between the elevator basket (1) and the drive shaft (7). around a break plate (8) located in the bottom of the shaft and further to the counterweight (2) to which the other end of the carrier line (5) is also attached. 2. Liner arrangements in an elevator, where the elevator basket (1) and the counterweight (2) running along guides in the elevator shaft are suspended in support ropes (3), where the support lines (3) are attached to the upper part of the elevator basket (1) and run via the at least a break plate (4) to the counterweight (2), and at least one carrier line (5) is guided via at least one break plate (8) so that it can move the lift basket (1) and the counterweight (2), the first of the carrier line (5) also mounted in the elevator basket (1), characterized in that the carrier line (5) is guided from the point of attachment in the elevator basket (1) around a drive disk (7) and thereafter located in the upper part of the elevator shaft in the space between the elevator basket (1) and the side wall of the shaft. at least around a break plate (8) located in the bottom of the shaft and further to the lift basket (1) to which the other end of the carrier line (5) is also attached. Elevator arrangement according to claim 1 or 2 in an elevator, characterized in that the carrier line (5) is a substantially thin line made of synthetic fiber, such as aramid fiber, and has a second sheath of plastic material, such as polyurethane. Lift arrangement according to claim 1 or 2, characterized in that the carrier line (5) is a line where the card parts (12a-12f) are of synthetic fiber, for example aramid fiber, and menin (4); . are of plastic material, such as polyurethane, and that the card parts (12a-12f) are positioned next to each other in at least one cardel bearing so that the cross-section of the line is substantially greater than height. . Elevator arrangement according to claim 1 or 2, characterized in that the carrier line (5) consists of several parallel lines where the card parts (12a-12f) are placed separately so that each card part functions as an independent line.