EP3337749B1 - Belt pulley for an elevator system - Google Patents

Description

The present invention relates to an elevator system and, in particular, to a configuration of a roller in this elevator system.

In elevator systems, steel cables are conventionally used as suspension means for supporting and / or driving an elevator car. According to a further development of such steel cables, belt-like suspension elements, which have tension members and a casing arranged around the tension members, are also used. Such belt-like suspension elements, like conventional steel cables, are guided over traction sheaves and pulleys in the elevator system. In contrast to steel cables, however, belt-like suspension elements are not guided in grooves in the deflection rollers or drive pulleys, but rather the belt-like suspension elements essentially rest on the deflection rollers or drive pulleys.

In elevator systems, suspension elements do not always run exactly perpendicular to an axis of deflection pulleys or traction sheaves. An occurrence of diagonal pull can be caused on the one hand by a construction, or on the other hand by imprecise assembly of the elevator system. As a result of such an inclined pulling of the suspension elements, there is the risk that the suspension element will slip laterally from a deflection roller or from a drive pulley of the drive. In order to prevent this, an attempt is made to guide the belt-like suspension elements laterally on pulleys or drive pulleys. For example, spherical pulleys are used on which such suspension elements are guided laterally to a certain extent. In order to prevent the belt-like suspension elements from derailing to the side, raised side edges are also used on the pulleys or traction sheaves. In addition, belt-like suspension elements with longitudinal ribs and longitudinal grooves on the traction surface of the suspension element and on the traction surface of the deflection rollers or drive pulleys are known, which interlock and thus ensure lateral guidance of the belt-like suspension element on the deflection rollers or drive pulleys.

From the DE102008037537A1 an elevator installation with a traction mechanism according to the preamble of claim 1 is known.

The traction mechanism consists of a traction mechanism and at least one traction sheave, with a sheathed tension member of the traction mechanism engaging in a corresponding groove in the traction disk.

The EP0509404A2 discloses a traction sheave in which the guide of the hoisting rope on the traction sheave is shaped by a radius groove with wedge-shaped flanks adjoining on both sides.

In the EP0346160A1 a pulley is disclosed, which rope-engaging grooves which are substantially deeper than the diameter of the rope and have outwardly diverging sides.

The EP1777189A1 shows a suspension element with ribs and a suspension element disk with grooves that fit onto the ribs.

It has been shown, however, that measures such as spherical deflection pulleys and traction sheaves, raised side edges or longitudinal grooves in the suspension element cannot always prevent the suspension element from derailing sideways. Particularly in the case of suspension elements with longitudinal ribs, it was observed that the suspension element was laterally offset by one or more longitudinal ribs by pulling at an angle so that the suspension element protrudes laterally beyond the deflection roller without derailing completely laterally. There is thus the risk that a suspension element will at least partially derail at the side of a deflecting roller or a traction sheave without this being recognized by the safety systems of the elevator installation.

It is therefore an object of the present invention to provide an elevator system in which an at least partially lateral derailment of rollers is reliably prevented. Such a device should also be inexpensive to manufacture and robust in use.

This object is achieved by an elevator installation according to claim 1.

A role configured in this way offers the advantage that a lateral derailment of the belt-like suspension element can be made very difficult or even prevented entirely. In order to ensure the most economical and safe operation of the elevator system, it is also important that the belt-like suspension element is not damaged when it is moved laterally away from the roller contact surface. By providing a retaining element close to the outermost longitudinal depression, it can be ensured that a derailing suspension element is removed from the retaining element before it can move laterally. It has been observed that such belt-like suspension elements with longitudinal depressions have the tendency to rise up in the longitudinal depressions of the roller contact surface when pulled at an angle and possibly jump over into the next longitudinal depression of the roller contact surface.

Since the distance between the outermost longitudinal recess and the retaining element is kept smaller than half a longitudinal recess width, the derailing belt-like suspension element is returned to the correct position by the retaining element before the belt-like suspension element can completely rise from the longitudinal depressions of the roller contact surface.

According to the invention, the guide surface of the retaining element has an undercut, so that the guide surface inclines over the belt-like suspension element. This has the advantage that the belt-like suspension element only touches the retaining element tangentially during a lateral displacement, as a result of which the belt-like suspension element is returned more gently into its intended position on the roller. In addition, the inclination of the guide surface has the effect that the belt-like suspension element is guided downwards into the longitudinal depression of the roller contact surface, which facilitates a return to the intended position of the belt-like suspension element.

In an exemplary embodiment, the distance between the outermost longitudinal recess and the retaining element is less than 80% or less than 60% or less than 40% or less than 20% of half the longitudinal recess width of the roller contact surface. On the one hand, this distance should be kept as small as possible, so that the belt-like suspension element can rise as little as possible in the longitudinal depressions of the roller contact surface before it is guided back into the longitudinal depressions by the retaining element. On the other hand, however, this distance should not be too small so that the belt-like suspension element does not suffer damage to the retaining element in normal operation. An ideal distance can thus be selected here depending on the design of the belt-like suspension element. It is essential that the distance is smaller than half the length of the longitudinal recess width of the roller contact surface, so that in any case a complete rise of the belt-like suspension element out of the longitudinal recesses can be prevented.

In an exemplary embodiment, a suspension element height is essentially the same as a restraint element height. Such a dimensioning of the retaining element ensures that the laterally rising belt-like suspension element cannot protrude beyond the retaining element.

In an exemplary embodiment, an edge of the retaining element, which is exposed in the direction of the roller contact surface, is rounded. This has the advantage that the laterally derailing belt-like suspension element cannot be damaged on a sharp edge. The belt-like suspension element should be returned to its original position on the roller as gently as possible by the retaining element.

In an advantageous further development, the guide surface is inclined more towards the belt-like suspension element, the further the guide surface is away from the axis of rotation.

In an advantageous development, the angle of the guide surface is between 0 ° and 15 ° or between 1 ° and 10 ° or between 2 ° and 8 ° or between 3 ° and 7 °. Depending on the design of the belt-like suspension element and the distance between the outermost longitudinal depression of the roller and the retaining element, an optimal inclination of the guide surface can be selected here.

In an exemplary embodiment, a retaining element is arranged on each side of the roller contact surface. This has the advantage that it can effectively prevent lateral derailment on both sides of the roller.

In an exemplary embodiment, the roller is a power roller and the roller contact surface is a traction surface.

In an alternative embodiment, the roller is a car deflection roller or a counterweight deflection roller.

In a further alternative embodiment, the roller is another deflection roller in an elevator system.

It goes without saying that several of the mentioned roller types can be equipped with the retaining elements described here in an elevator installation. Depending on the construction of the elevator system, diagonal pulls are to be expected on different rollers of an elevator system. Therefore, depending on the elevator system, it can be advantageous to equip one or more rollers with the retaining elements described here.

In an exemplary embodiment, the longitudinal elevations of the belt-like suspension element are designed as wedge ribs and the longitudinal depressions of the roller contact surface are designed as wedge-shaped grooves.

In an alternative embodiment, the longitudinal elevations of the belt-like suspension element are designed as elevations with a partially circular cross section and the longitudinal depressions of the roller contact surface are designed as depressions with a partially circular cross section.

The retaining elements described here can be used in principle for various types of belt-like suspension elements with longitudinal elevations. In addition to the V-ribbed belts mentioned and composite ropes with individually sheathed ropes, which are connected to one another via a common back layer, a number of other belt-like suspension elements with longitudinal elevations can of course be used.

In an exemplary embodiment, a number of the longitudinal elevations of the belt-like suspension element is the same as a number of the longitudinal depressions of the roller contact surface. This has the advantage that as a result, the belt-like suspension element is not even allowed to jump over to the side in the longitudinal depressions of the roller contact surface. As soon as in this embodiment the belt-like suspension element rises on one side in a longitudinal depression of the roller contact surface, it comes into contact with the guide surface of the retaining element before it can be displaced laterally. Lateral displacements of the belt-like suspension element can thus be prevented entirely, which is advantageous for economical and safe operation of the elevator system.

In an exemplary embodiment, the roller and the retaining element are formed in one piece. This has the advantage that the retaining element remains stable in its intended position.

Fig. 1

eine schematische Darstellung einer beispielhaften Aufzugsanlage;

Fig. 2

eine schematische Darstellung einer nichterfindungsgemäßen beispielhaften Rolle;

Fig. 3A

eine schematische Darstellung eines beispielhaften riemenartigen Tragmittels;

Fig. 3B

eine schematische Darstellung eines beispielhaften riemenartigen Tragmittels;

Fig. 4

eine schematische Darstellung eines nichterfindungsgemäßen beispielhaften riemenartigen Tragmittels auf einer beispielhaften Rolle; und

Fig. 5

eine schematische Darstellung eines beispielhaften Rückhalteelements gemäß der Erfindung.

The invention is explained in more detail symbolically and by way of example with the aid of figures. Show it:

Fig. 1

a schematic representation of an exemplary elevator system;

Fig. 2

a schematic representation of an exemplary role not according to the invention;

Figure 3A

a schematic representation of an exemplary belt-like suspension element;

Figure 3B

a schematic representation of an exemplary belt-like suspension element;

Fig. 4

a schematic representation of an exemplary belt-like suspension element not according to the invention on an exemplary roller; and

Fig. 5

a schematic representation of an exemplary retaining element according to the invention.

In Fig. 1 an exemplary embodiment of an elevator installation 1 is shown. The elevator system 1 comprises a car 2, a counterweight 3, a drive and a belt-like suspension element 5. The belt-like suspension element 5 is fixed in the elevator system 1 by a first suspension element attachment 7, guided over a counterweight pulley 10, guided over a drive roller 4, over two car pulleys 8 and secured in turn in the elevator system 1 by a second suspension element fastening 7.

In this exemplary embodiment, the elevator installation 1 is arranged in a shaft 6. In an alternative embodiment, not shown, the elevator system is not arranged in a shaft, but rather, for example, on an outer wall of a building.

The exemplary elevator installation 1 in Fig. 1 comprises a counterweight 3. In an alternative embodiment, not shown, the elevator installation does not comprise a counterweight. Numerous other embodiments of an elevator system are also possible.

In Fig. 2 an exemplary embodiment of a roller 4, 8, 10 not according to the invention is shown. This roller 4, 8, 10 can be used as a driving roller or as a car deflection roller or as a counterweight deflection roller or as another deflection roller in the elevator system. In the embodiment not shown in accordance with the invention, the roller 4, 8, 10 has two retaining elements 17. The retaining elements 17 are arranged in mirror image to one another. Each retaining element 17 is arranged on one side of the roller contact surface 15. In this exemplary embodiment not according to the invention, the roller contact surface 15 comprises several longitudinal depressions 13. The roller 4, 8, 10 has at least as many longitudinal depressions 13 as the belt-type one used Has support means longitudinal elevations. The roller 4, 8, 10 is arranged so as to be rotatable about an axis of rotation 20.

The roller contact surface 15 of the roller 4, 8, 10 from the exemplary embodiment not according to the invention in FIG Fig. 2 is designed so that it is provided with a belt-like suspension element 5 according to FIG Figure 3B can work together. The belt-like suspension element 5 in the embodiment according to FIG. Figure 3B comprises several longitudinal elevations 33 in the form of V-ribs. These wedge ribs are dimensioned so that they complementarily into the longitudinal recesses 13 of the contact surface 15 of the roller according to Fig. 2 can intervene. The belt-like suspension element 5 in Figure 3B comprises several tension members 32 and a jacket 31 arranged around the tension members. The tension members 32 are arranged in a common plane. The longitudinal elevations 33 rise above this common plane of the tension members 32.

In Figure 3A an alternative belt-like suspension element 5 is shown as an example. In contrast to the belt-like suspension element according to Figure 3B the longitudinal elevations 33 in this embodiment are formed as elevations with a part-circular cross-section. The tension members 32 are in each case arranged at least partially in these longitudinal elevations 33. The jacket 31 surrounds all tension members 32 and thus connects the tension members 32 to form a common belt-like suspension element 5. A roller for interacting with the belt-like suspension element 5 according to the exemplary embodiment in FIG Figure 3A is not shown. Such a role would have instead of the wedge-shaped longitudinal depressions 13, as shown in Fig. 2 are shown, longitudinal depressions with a part-circular cross-section.

In addition to the Figures 3A and 3B Belt-like suspension means 5 shown by way of example, a whole series of further belt-like suspension means with longitudinal elevations are possible. Of course, a different configuration with regard to the number of tension members and a configuration of the shell shape is also possible. In addition, the tension members can be arranged in the jacket in various ways. For example, can several tension members can be arranged per longitudinal elevation, or precisely one tension member per longitudinal elevation can be provided. In addition, the arrangement of the longitudinal elevations can be selected independently of the arrangement of the tension members.

In Fig. 4 a section of an exemplary roller 4, 8, 10 not according to the invention and a section of a belt-like suspension element 5 cooperating therewith is shown. The belt-like suspension element 5 has partially climbed out of the longitudinal depressions 13 and is prevented from further lateral upward movement by the retaining element 17. As a result of this movement limitation, which is ensured by the retaining element 17, the belt-like support means 5 is prevented from further lateral displacement and is returned to an intended position on the roller 4, 8, 10.

A distance 19 between an outermost longitudinal recess 13 and the retaining element 17 is designed to be smaller than half a longitudinal recess width 18 of the roller contact surface 15. Depending on the embodiment of the belt-like suspension element 5, the distance 19 can be selected to be smaller or larger. The distance 19 should, however, be chosen to be at least large enough that a guide surface 12 of the retaining element 17 does not hinder the belt-like suspension element 5 in its movement over the roller 4, 8, 10 in a normal operating state of the elevator system.

In this exemplary embodiment not according to the invention, the retaining element 17 is essentially dimensioned in such a way that the belt-like suspension element 5 cannot protrude beyond the retaining element 17 in the event of a laterally upward movement. Thus, a retaining element height 14 is approximately the same as a suspension element height 16. The retaining element height 14 can be selected depending on the distance 19 and the design of the belt-like suspension element 5 so that the belt-like suspension element 5 cannot exceed the retaining element 17 at any time. In this not in accordance with the invention

In the exemplary embodiment, one edge of the retaining element 17 is also rounded, so that the belt-like suspension element is not damaged if it comes into contact with this edge.

In Fig. 5 a section of an exemplary embodiment of the roll 4, 8, 10 according to the invention is shown. The guide surface 12 of the retaining element 17 is inclined. The guide surface 12 is thus inclined at an angle 11 from a perpendicular to the axis of rotation of the roller 4, 8, 10. In this exemplary embodiment according to the invention, the angle 11 is approximately 5 °. This inclination of the guide surface 12 ensures that the belt-like suspension element moving laterally only comes into contact tangentially with the guide surface 12, so that the belt-like suspension element is subject to as little wear as possible. In addition, the inclination of the guide surface 12 has the effect that the belt-like suspension element is guided back down into the longitudinal depressions 13. In this exemplary embodiment according to the invention, too, one edge of the retaining element 17 is rounded in order to prevent possible damage to the belt-like suspension element.

Claims (13)

1. An elevator system (1), in which a belt-type carrier means (5) is guided over a roller (4, 8, 10), longitudinal elevations (33) of the belt-type carrier means (5) engaging into longitudinal recesses (13) of a roller contact surface (15), and the rollers (4, 8, 10) having at least one retaining element (17) which is arranged laterally with respect to the roller contact surface (15), and a distance (19) between an outermost longitudinal recess (13) and the retaining element (17) being less than half a longitudinal recess width (18) of the roller contact surface (15), characterized in that the retaining element (17) has a guide surface (12) which is inclined at an angle (11) relative to a line perpendicular to the axis of rotation (20) of the roller (4, 8, 10), as a result of which the guide surface has an undercut so that the guide surface (12) is inclined over the belt-type carrier means.
2. The elevator system according to claim 1, wherein the distance (19) between the outermost longitudinal recess (13) and the retaining element (17) is less than 80% or less than 60% or less than 40% or less than 20% of half the longitudinal recess width (18) of the roller contact surface (15).
3. The elevator system according to any of the preceding claims, wherein a carrier means height (16) is substantially as large as a retaining element height (14).
4. The elevator system according to any of the preceding claims, wherein an edge of the retaining element (17) that is exposed in the direction of the roller contact surface (15) has a round design.
5. The elevator system according to any of the preceding claims, wherein the guide surface (12) is inclined more toward the belt-type carrier means (5) as the guide surface (12) gets further away from the axis of rotation (20).
6. The elevator system according to claim 5, wherein the angle (11) is between 0° and 15° or between 1° and 10° or between 2° and 8° or between 3° and 7°.
7. The elevator system according to any of the preceding claims, wherein one retaining (17) element is arranged on each side of the roller contact surface (15).
8. The elevator system according to any of the preceding claims, wherein the roller (4, 8, 10) is a drive roller (4) and wherein the roller contact surface (15) is a traction surface.
9. The elevator system according to any of claims 1 to 7, wherein the roller (4, 8, 10) is a cab deflection roller (8) or a counterweight deflection roller (10).
10. The elevator system according to any of the preceding claims, wherein the longitudinal elevations (33) of the belt-type carrier means (5) are designed as V-ribs and wherein the longitudinal recesses (13) of the roller contact surface (15) are designed as V-grooves.
11. The elevator system according to any of claims 1 to 9, wherein the longitudinal elevations (33) of the belt-type carrier means (5) are designed as elevations having a semi-circular cross-section and wherein the longitudinal recesses (13) of the roller contact surface (15) are designed as recesses having a semi-circular cross-section.
12. The elevator system according to any of the preceding claims, wherein a number of the longitudinal elevations (33) of the belt-type carrier means (5) is the same as a number of the longitudinal recesses (13) of the roller contact surface (15).
13. The elevator system according to any of the preceding claims, wherein the rollers (4, 8, 10) and the retaining element (17) are designed as a single piece.

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