FI103724B - Elevator rope arrangement - Google Patents

Description

103724

LIFT ROPE ARRANGEMENT

This invention relates to an elevator rope arrangement according to the preamble of claim 1.

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In the traction sheaves, the elevator car and counterweight are hung on round steel ropes. Normally, the same ropes serve as both support ropes which serve to support the elevator car and counterweight and lifting ropes which move the 10 elevator car and counterweight. In this case, the ropes need to be dimensioned according to the total load to be carried, even if the force needed to move the elevator is very low when using the counterweight, in the extreme case almost zero when the counterweight and the elevator car with load are equal.

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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. In an elevator according to that patent, a carrier rope is secured to the upper part of the elevator car 2 0 and guided via folding wheels to a lever member counterweighted. The hoisting rope is attached to either the lower or upper part of the elevator car and is also guided to the counterweight lever member via the pulleys and the drive wheel of the hoisting machine. For the stretching of the ropes, it is necessary to. in the counterweight:, 25, a tensioning lever acting as a clamping device.

. . ·. The patented solution has a particular focus on tensioning the lifting rope, with no mention of the details of the lifting ropes or suspension ropes. Similarly, no advantages have been pointed out which could be obtained, in particular, by the • • · 30 separation of lifting and carrying ropes.

• · · «·« ··: In general, steel ropes are used as lifting ropes, but the coefficient of friction ... · with metal traction wheels is so small that it has to be increased by, for example, various grooves on the traction 35 wheels or by increasing the rotation angle around the drive wheel. In addition, the steel lifting cable 2 103724 acts as a kind of sound bridge between the hoisting motor drive and the elevator car, leading the hoisting machine noises to the elevator car and thereby reducing ride comfort.

A further disadvantage of prior art solutions using a steel lifting rope is a larger bending radius of the rope, requiring 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 elevator ropes are divided into two parts: a) supporting ropes which serve to connect and support the elevator car and the counterweight; the task is to absorb the imbalance between the elevator car and the load and to move the elevator car.

. . 20 Now there is no need to worry about friction with the support ropes; so they can be made of steel ropes. Instead, thin artificial ropes are used as lifting ropes for the elevator, where the strength of the structure is formed by longitudinal strands, for example made of ara:: mid fibers. These strands are surrounded by • · · * ·: · * 25 sheaths that bind each rope into a single unit * · * * and provide a good friction coefficient against the drive wheel. The material of the jacket is, for example, polyurethane, which gives a multiplicity of friction • · · • · · * * compared to, for example, steel rope. Detailed features of the · · 30 features of the solution according to the invention are set forth in the appended claims.

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

Thanks to this, the elevator hoisting rope 3 103724 of the invention can be made very thin with a small bending radius. The lifting rope can also be made flat, in which case the jacket of the lifting rope is planar and thus the cross-section of the lifting rope is substantially larger than its thickness.

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Thanks to the thin and / or flat lifting rope, it is now possible to use a traction sheave which is considerably smaller and lighter than the traction sheaves currently in use. Here, too, the torque required to move the elevator car is small, which implies that a small and inexpensive lifting motor can be used. Furthermore, 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 15, the elevator is well suited for a machine-free elevator, where the hoisting motor and the traction sheave fit into the elevator shaft.

In the following, the invention will be described in more detail with reference to the foregoing drawings, with reference to the accompanying drawings, in which Fig. 1 illustrates an elevator rope arrangement according to the invention, Fig. 2 shows another elevator according to the invention. Fig. 3 shows a lifting rope suitable for an elevator system according to the invention. 1 2 3 4 5 6 2 · «» «3

Fig. 1 shows a traction sheave elevator 4 according to the invention, in which the counterweight 2 of the elevator car 1 and 5 passing along the rails in the elevator shaft is suspended from the supporting ropes 3. The steel carrier ropes 3 are secured to the upper part of the elevator car 1 and 6 are guided through the diverting wheel 4 to the counterweight 2. Similarly, the substantially thin, substantially circular, flexible artificial elevator car to the lower part through the drive gear 7 of the drive mechanism 6 located below the elevator shaft 1 and the diverting wheel 8 below the counterweight. The drive mechanism is, for example, a disc-shaped electric motor with a flat diameter, the rotor of which has an integrated drive wheel and a stator and a rotor having a larger diameter than the drive wheel. The drive mechanism may be attached either to the bottom of the shaft or to the wall structures of the shaft at the bottom of the shaft. There may be several lifting ropes side by side. In the solution of Fig. 1, the friction between the hoisting ropes and the drive wheel 15 is improved by twisting the hoisting ropes around the drive wheel 7 so that the hoisting ropes from the top elevator car go down above the hub and intersect with themselves, and continue from the junction to the diverting pulley 8, which, when rotated below, rises to the counterweight. In this embodiment, the hoisting ropes are attached to the lower part of the counterweight. In this hanging case, several thin lifting ropes, • · · *;]; * 25 have been used, but one flat rope can be used. An additional difficulty when using a flat rope is the crossing of the rope with itself, since the rope is relatively wide. However, crossing • 1 can be accomplished either by turning • *.

• <»* · '* the required amount of drive wheel around its rotation plane or *: · 30 by adding a drive wheel in its rotation plane. There is still one possibility to both rotate and tilt the drive wheel as described above, thereby reducing the required angle of rotation and tilt than with either rotation or tilt. Also, when using separate lifting ropes, the drive wheel must be tilted and / or rotated to allow the ropes to cross.

The hoisting ropes are tensioned by an impeller 8 between the elevator car and 5 by the counterweight. The tensioning is effected by means of a tension spring 9 which pulls the diverting pulley 8 so that the lifting ropes always remain sufficiently tight with respect to the friction required by the traction sheave, despite the stretching of the lifting ropes. The tensioning may also be in connection with the hoisting machine, whereby the position of the diverting pulley 10 is fixed.

Figure 2 shows a hanging solution which is more suitable for the flat lifting rope than the one shown in Figure 1, since the lifting rope does not intersect with itself. The supporting ropes are suspended as in the solution of Fig. 1. Each hoisting rope 5 is secured at its first end to the lower part of the elevator car 1 and guided to the lower part of the counterweight 2 via the drive gear 7 of the drive mechanism 6 located below the elevator car 1 and the diverting wheel 8 below the counterweight. The lifting ropes are the same as in the solution of Fig. 1, either several separate in parallel or one flat. The lifting ropes from the top elevator car go down to the traction sheave relative to the diverting pulley 8, first rotate lower downward around the traction sheave, and continue to travel to the diverting pulley 8 which, upon rotation below, rises to the counterweight. In this case, however, the contact angle of the hoisting rope with the drive wheel is substantially smaller than in the solution of Fig. 1, where it can be up to 270 °. Because of this, the friction is also smaller, so that the rope tension must be greater than in the case of Fig. 1. Otherwise, the tightening is implemented in the manner of the solution of Figure 1.

Figure 3 shows a substantially flat elevator hoisting rope 5 used in the suspension solution 35 of the invention. It has 6 103724 six six-bundled strand bundles 12a-12f.

The bundles of strands 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 5 are surrounded by a sheath 14 which binds the strands together into a single unit and provides a good coefficient of friction against the drive wheel. The strand bundles 12a - 12f are arranged side by side, whereby the sheath 14 is planar, and the width of the rope is considerably greater than its thickness. The material of the sheath 14 is e.g. polyurethane 10, which gives a multiple coefficient of friction compared to steel rope. If necessary, the planar surface of the diaper may be coated with various materials. In this case, the friction and wear properties of the coating 15 can be optimized for different drive wheel materials. The strand bundles are circular in Figure 3, but are naturally selectable according to their intended use.

When using thin discrete lifting ropes, the strands 12a - 12f are spaced apart so that they function in a manner similar to self-rope lifting ropes, independently of the other strands.

As already stated above, when using the hoisting rope structure according to the invention, for example, the traction sheaves required in the elevator suspension described above are considerably smaller and lighter than the traction sheaves used in ny-25.

It will be apparent to one skilled in the art that various embodiments of the invention are not limited solely to the above-described Example 30, 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 a V-belt type, whereby the traction sheave 35 allows extremely high friction between each rope 7 103724 and the traction sheave. Similarly, 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.

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Claims (5)

A linear arrangement in an elevator, where a lift basket (1) and a counterweight (2) along the guides in the elevator shaft are suspended in support ropes (3) so that they are attached to the upper part of the elevator basket (1) and via at least one break plate (4). is led to the counterweight (2), and where at least one carrier line (5) is attached to the lift basket (1) and is guided to the counterweight (2) via the drive disc (7) of the drive machinery (6) and at least one break disc (8), characterized by: that the carrier line (5) is a substantially thin line of synthetic material stretched in the lower part of the elevator shaft. Elevator arrangement according to claim 1, characterized in that the carrier line (5) is a substantially thin line made of synthetic fiber, such as aramid fiber, and has a sheath of plastic material, such as polyurethane. Elevator 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 men's (4) are of plastic material, such as polyurethane, and that the strands (12a ... 12f) are positioned next to each other in at least one stretcher bearing so that the cross-section of the rope 25 is substantially greater in width than height. Elevator arrangement according to claim 1 or 2, characterized in that the carrier line (5) consists of several parallel ropes in which the card parts (12a ... 12f) are arranged separately so that each card part functions as an independent line. 35