Belt for carrying running basket and / or counterweight of elevator system

Abstract

The invention relates to a belt (7) for carrying a traveling basket (5) and / or a counterweight (13) of an elevator system (1), comprising a belt body (17) having a traction side (21) for contacting a drive wheel (11) of the elevator system (1) and a back side (19) opposite the traction side (21), the belt body (17) having a groove profile (24) on the traction side (21) adapted to the outer profile of the drive wheel (11), the back side (19) is provided with a profile which is different from the groove profile (24). A plurality of tension carriers (22, 22a, 22b) embedded in the belt body (17) to transmit tension, each tension carrier (22, 22a, 22b) being composed of a plurality of strands (31, 31a, 31b) intertwisted with each other, and each strand (31, 31a, 31b) being composed of a plurality of aramid fibers (23) intertwisted with each other.

Description

Technical Field

[0001] The present invention relates to a belt for carrying a travel basket and / or a counterweight of an elevator system. In addition, the present invention also relates to a method for manufacturing such a belt and an elevator system having such a belt. Background Art

[0002] The traveling basket of an elevator system can be suspended, for example, on a plurality of steel cables, which are guided via a drive wheel driven by an electric drive and connected to the drive wheel in a friction-locking manner. The traveling basket can then be raised or lowered by the rotation of the drive wheel. Instead of such steel cables, a special belt (also called a safety belt) can also be used. Such a belt usually comprises a belt-like belt body made of an elastomeric material, into which a plurality of tension carriers in the form of relatively thin steel cables are embedded. The tension carriers are used to bear most of the dynamic and / or static tensions that occur during the operation of the elevator system. The friction connection with the drive wheel is established by the belt body. In order to achieve simple assembly and / or disassembly and efficient operation of the elevator system, the belt should be as light as possible and have a high breaking load compared to its own weight.

[0003] Examples of such belts are described in EP 2 356 055 B1 and WO 2016 / 030298 A1.

[0004] EP 1 905 892 A2 describes a synthetic fiber rope for elevator installations. Summary of the invention

[0005] Therefore, can need a kind of improved, particularly weight-optimized, be used to carry the belt of the traveling basket and / or counterweight of elevator equipment.In addition, can need a kind of corresponding method for making this belt and a kind of corresponding elevator equipment.

[0006] These needs are met by the subject matter of the independent claims. Advantageous embodiments are given in the dependent claims, the following description and the drawings.

[0007] A first aspect of the invention relates to a belt for carrying a traveling basket and / or a counterweight of an elevator system. The belt comprises a belt body having a traction side for contacting a drive wheel of the elevator system and a back side opposite to the traction side, wherein the belt body has a groove profile on the traction side that matches the outer profile of the drive wheel and has a profile different from the groove profile on the back side (for example, the belt body can be flat on the back side or have a groove profile different from that on the traction side). In addition, the belt comprises a plurality of tension carriers embedded in the belt body for transmitting tension, wherein each tension carrier is formed by a plurality of strands twisted together, and each strand is formed by a plurality of metal or non-metal fibers, in particular aramid fibers or steel fibers, twisted together.

[0008] Compared to similar belts with tensile load carriers, such belts are significantly lighter with the same load-bearing capacity. This simplifies the handling of the belt, in particular during assembly and / or disassembly in very tall buildings, such as skyscrapers (in these cases, depending on the height of the building, the belt can be several hundred or even more than a thousand meters long). In addition, in tests, such belts have proven to have a particularly long service life and require little maintenance. The lower dead weight means that less mass must be moved at the same breaking load. In addition, such lightweight belts allow higher car loads than conventional heavy belts.

[0009] The belt body can generally be understood as a sheath of the tension carrier. The belt body can be made of an elastomeric material, in particular of polyurethane or an elastomeric material including polyurethane.

[0010] In particular, the belt can be wider than it is high.

[0011] The expression “embedded in the belt body” may be understood as “partially or completely surrounded by the belt body” upstream and downstream.

[0012] The tension carriers (also referred to as cores or pull cords) can be arranged side by side and / or one above the other in the belt. In particular, the tension carriers can be arranged evenly distributed over the width of the belt. It is also advantageous if all tension carriers are located at the same height or have the same travel radius.

[0013] For example, each strand (also referred to as a rope) can be formed from a plurality of yarns twisted together, wherein each yarn can be formed from a plurality of unidirectional, i.e. not twisted together, aramid fibers. For example, each yarn can contain more than 100 or more than 1000 aramid fibers. Each yarn can additionally be immersed in a plastic bath.

[0014] In addition, other non-metallic fibers, such as glass fibers, can also be used. It is particularly advantageous to use fibers with a tensile strength greater than 1000 N / mm 2 , especially 2000N / mm 2 , preferably 3000N / mm 2 , particularly preferably 4000N / mm 2 , especially 5000N / mm 2 High strength fiber.

[0015] The strands formed from the yarn may optionally be subjected to a heat treatment to smooth the outer surface of the strands.

[0016] The strands of the same tensile force carrier may be of the same and / or different thicknesses.

[0017] For example, the strands of each tensile force carrier may be twisted with one another in a first twist direction, and the aramid fibers (or yarns) of each strand of the tensile force carrier may be twisted with one another in a second twist direction different from the first twist direction.

[0018] The lay length of the individual strands may for example be between 20 mm and 30 mm, in particular between 21 mm and 25 mm (for the thickest strands).

[0019] For example, the lay length of a single tension carrier may be between 40 mm and 60 mm, more particularly between 48 mm and 52 mm (plus / minus 2 mm).

[0020] It is possible that each tension carrier comprises only aramid fibers, i.e., does not comprise any other fibers or threads (e.g., steel threads) besides the aramid fibers. However, it is also conceivable that the tension carrier has a mixed composition, which comprises other fibers or threads (e.g., steel threads or carbon fibers) besides the aramid fibers.

[0021] In tests, belt variants have proven to be particularly advantageous in which the ratio of the breaking load of the belt (in kN) to the width (in mm) is greater than 2 kN / mm, in particular greater than 3 kN / mm, particularly preferably between 3.6 kN / mm and 3.75 kN / mm, and / or greater than 4 kN / mm, in particular greater than 5 kN / mm, particularly preferably between 5.2 kN / mm and 5.4 kN / mm.

[0022] A second aspect of the invention relates to a method for producing a belt for carrying a traveling basket and / or a counterweight of an elevator system, in particular the belts described above and below. The method comprises the following steps: providing a plurality of tension carriers for transmitting tension, each tension carrier consisting of a plurality of strands twisted together, each strand consisting of a plurality of aramid fibers twisted together; preheating the tension carriers to a temperature between 120° C. and 160° C., preferably between 130° C. and 150° C., particularly preferably between 135° C. and 145° C.; and molding a belt body in which the tension carriers are embedded by embedding the preheated tension carriers into an elastomeric material by extruding the elastomeric material, the belt body having a traction side for contacting a drive wheel of the elevator system and a back side opposite to the traction side.

[0023] This method enables particularly efficient production of the belt.

[0024] For preheating, the tensile force carrier can be heated locally in one or more sections, for example. The heated section or sections can be, for example, sections that are subsequently to be embedded in the elastomeric material.

[0025] The belt body can be formed, in particular, on the traction side with a groove profile that matches the outer profile of the drive pulley and on the back side with a profile that differs from the groove profile (for example, the belt body can be flat on the back side or formed with a groove profile that differs from the traction side). In this case, for example, the profile height of the groove profile can correspond to at least half of the total height of the belt.

[0026] It should be noted that features of the method may also be features of the belts described above and below (and vice versa).

[0027] A third aspect of the invention relates to an elevator installation. The elevator installation comprises a belt and an elevator shaft as described above and below. In addition, the elevator installation comprises a traveling basket movably arranged in the elevator shaft, wherein the belt carries the traveling basket, or a counterweight movably arranged in the elevator shaft, wherein the belt carries the counterweight, or both the traveling basket and the counterweight.

[0028] The travel basket and the counterweight can be connected to each other via the same belt or each can be carried by its own belt.

[0029] Without limiting the scope of the invention in any way, embodiments of the invention may be considered to be based upon the concepts and teachings presented below.

[0030] According to one embodiment, the profile height of the groove profile can correspond to at least half the total height of the belt. Additionally or alternatively, as mentioned above, the belt body can be flat on the back side. The belt can thus be designed to be particularly flat. This improves the flexibility of the belt in particular. The sheath simultaneously protects the tensile force carrier from environmental influences, such as moisture and UV rays.

[0031] According to one embodiment, each tension carrier may include a central strand and a plurality, in particular six (annularly) surrounding outer strands of the central strand. Additionally or alternatively, the ratio of the diameter of the thinnest strand of the strands to the diameter of the thickest strand of the strands may be at least 0.8, in particular at least 0.9.

[0032] The outer strands can surround the central strand in one or more layers. In this case, for example, each layer can include at least six outer strands. Different layers can include the same or different numbers of outer strands. The spacing between adjacent outer strands (of the same layer) can be, for example, up to 0.5 mm, in particular up to 0.1 mm. The diameter of the central strand and / or each outer strand can be, for example, between 1 mm and 3 mm. The central strand can be implemented as thicker than any outer strand. However, the opposite is also possible.

[0033] Therefore, the tension carrier can be designed to be particularly thin, that is to say particularly weight-saving, without significantly affecting the load-bearing capacity of the belt. With this embodiment, a length weight of less than 500 g / m, in particular less than 250 g / m, can be achieved.

[0034] Belts having a ratio of breaking load (in kN) to weight per meter (g / m) of greater than 0.2, in particular greater than 0.3, preferably greater than 0.4, particularly preferably greater than 0.5 kN*m / g have proven to be advantageous.

[0035] A relatively light belt is thus provided which nevertheless has a high breaking load.

[0036] According to one embodiment, the tension carrier may include at least one (filamentary) first tension carrier and at least one (filamentary) second tension carrier, which are different from each other in their twist directions. The twist direction may be understood as S twist or Z twist, for example.

[0037] According to one embodiment, the tension carriers may include a plurality of first tension carriers and a plurality of second tension carriers, which are arranged distributed over the width of the belt. Here, at least one of the second tension carriers may be arranged between adjacent first tension carriers. In other words, the first and second tension carriers may be arranged to be distributed alternately over the width of the belt. In this way, the likelihood of the belt twisting under load can be reduced. This effect can be enhanced by embedding as many first tension carriers as second tension carriers into the belt, that is, the number of tension carriers is selected just right. For example, out of a total number of four tension carriers, two first tension carriers and two second tension carriers may be embedded in the tension carrier, out of a total number of six tension carriers, three first tension carriers and three second tension carriers may be embedded in the tension carrier, and so on.

[0038] According to one embodiment, at least four tension carriers may be embedded in the belt body. Additionally or alternatively, the number of tension carriers embedded in the belt body may be an even number. This can further improve the running performance of the belt under load.

[0039] According to one embodiment, a film made of an electrically conductive material, in particular copper, can be applied to the back side. For example, the film can extend over the entire length of the belt. This simplifies the monitoring of the belt. In particular, monitoring can thus be achieved by means of resistance measurement on the film (a significant change in the measured resistance can indicate damage to the belt).

[0040] According to one embodiment, at least one steel tensile carrier can additionally be embedded in the belt body. The steel tensile carrier can be designed in the form of a rope or strand. For example, the steel tensile carrier can be formed from a plurality of steel strands twisted together, wherein each steel strand can be formed from a plurality of steel wires twisted together. Alternatively, the steel tensile carrier can be formed from a single steel strand (e.g. for weight reasons). Compared to an embodiment without a steel tensile carrier, this embodiment allows easier monitoring of the belt. Thus, monitoring of the belt can be achieved in particular by means of a resistance measurement on the steel tensile carrier.

[0041] According to one embodiment, each tension carrier can have a flame-retardant sheath, in particular a flame-retardant polyurethane sheath. This reduces the risk of fire. The flame-retardant sheath can be made of a plastic material, for example, which contains at least one of the following flame-retardant additives: melamine phosphate, melamine polyphosphate, melamine cyanurate, ammonium polyphosphate, halogenated organic compound, organic phosphate, organic phosphonate, red phosphorus, metal hydroxide, metal carbonate, glass powder, quartz powder.

[0042] The flame retardant sheath can be at least partially constituted by the belt body. In other words, the flame retardant sheath can be made of the same material as the belt body, or partially or completely made of a material different from the belt body.

[0043] According to one embodiment, the traction side of the belt is free of flame retardant material, while the back side facing away from the traction side is formed with flame retardant material.

[0044] According to one embodiment, the groove profile can be formed by a plurality of elevations and depressions, the respective longitudinal directions of which can extend parallel to the longitudinal direction of the belt. In this case, each tension carrier can be embedded in one of the elevations, so that the cross-sectional area of ​​the elevation comprises at least half the cross-sectional area of ​​the tension carrier. As a result, the belt can be designed to be particularly flat. This improves the flexibility of the belt in particular.

[0045] According to one embodiment, the diameter of each tension carrier can be at least 70% of the total height of the belt. In tests, this ratio has proven to be particularly advantageous with regard to the weight and service life of the belt.

[0046] According to one embodiment, the formation of the belt body may include the following steps: forming a base body by embedding the preheated tension carrier into the elastomeric material by extruding the elastomeric material in a first extrusion step; and molding the belt body by applying the traction side and the back side to the base body by extruding the elastomeric material again in at least one second extrusion step.

[0047] Possibly, the traction side and the back side are applied to the base body in separate extrusion steps. For example, the back side can be applied before the traction side in this case (but the opposite is also possible).

[0048] Alternatively, the traction side and the back side can be applied to the base body simultaneously, ie in a common extrusion step. This can further improve the efficiency of the method.

[0049] In different extrusion steps, the same elastomer material can be extruded in each case. Alternatively, elastomer materials of different compositions can be extruded in different extrusion steps. In this way, for example, the corresponding properties of the base body, the traction side and / or the back side can be adjusted in a targeted manner (independently of one another).

[0050] In some cases, it may be useful to vulcanize the elastomeric material rather than extrude it. This is particularly the case when using EPDM elastomers.

[0051] According to one embodiment, the elevator installation can also include a drive wheel, wherein the belt can contact the drive wheel with its traction side. In this case, the diameter of the drive wheel is 80 to 120 times larger, in particular 90 to 110 times larger, than the diameter of the thickest strand of the belt. This size ratio has proven to be particularly practical in tests.

[0052] Additionally or alternatively, the basket can include its own brake, which is designed to brake and / or stop the basket during normal operation of the elevator system. The basket brake can be, for example, a mechanical brake mounted on the basket. The basket brake can be provided in addition to the anti-fall brake (which intervenes only in an emergency). This improves driving comfort. In particular, vibrations of the basket that impair driving comfort during braking can be avoided in this way. When using aramid tension carriers, such vibrations occur more strongly than with tension carriers made of steel and, in particular in the case of large lifting heights (long belts), can lead to undesirable losses in driving comfort.

[0053] Additionally or alternatively, the elevator installation can comprise a further drive pulley, wherein the belt contacts the further drive pulley with its traction side.

[0054] It has proven to be advantageous that when two drive pulleys (ie two drive devices) are used, each drive device can be designed to be relatively small and light. This results in an elevator system that can be easily installed due to the low weight of the drive and the belt.

[0055] According to one embodiment, the elevator installation is designed with a lifting height of more than 100 m, preferably more than 150 m, in particular more than 200 m, particularly preferably more than 250 m, advantageously more than 300 m.

[0056] The advantages of using relatively light belts (and drives) (energy savings in operation, simple installation) are particularly evident in the case of large lifting heights.

[0057] In such an elevator installation, the compensating medium, if present, is also lighter. This makes the installation of the elevator installation easier and enables energy-saving operation of the elevator installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Advantageous embodiments of the invention are explained in greater detail below with reference to the drawings, wherein neither the drawings nor the description are to be interpreted as limiting the invention in any way.

[0059] Figure 1 An elevator installation according to one embodiment of the present invention is shown.

[0060] Figure 2 A cross-sectional view of a belt according to one embodiment of the present invention is shown.

[0061] Figure 3 A cross-section showing the tension carrier of a belt.

[0062] The drawings are only schematic and not drawn to scale. Identical reference symbols in different figures denote identical or identically acting features. DETAILED DESCRIPTION

[0063] Figure 1 An elevator system 1 for transporting people and / or objects between floors of a multi-storey building is shown. The elevator system 1 comprises an elevator shaft 3 and a travel basket 5, which is arranged to be movable in the elevator shaft 3 between floors. The travel basket 5 is suspended on a belt 7, which is guided by a plurality of deflection rollers 9 and a drive pulley 11 for driving the belt 7. Furthermore, the travel basket 5 is connected to a counterweight 13 via the belt 7. By rotating the drive pulley 11 and correspondingly shifting the belt 7 which is frictionally connected to the drive pulley 11, depending on the direction of rotation, either the travel basket 5 is raised and the counterweight 13 is lowered (e.g. Figure 1 As indicated by the arrow in the figure), either the travel basket 5 is lowered and the counterweight 13 is raised. Figure 1 The elevator installation shown shows a suspension ratio of 2: 1. The invention described above and below can also be designed with a suspension ratio of 1: 1 (not shown).

[0064] The basket 5 can be equipped with its own, in particular mechanical, basket brake 15 which, during normal operation of the elevator installation 1 , additionally brakes the basket 5 , for example, in order to hold it at a destination floor.

[0065] exist Figure 2 and Figure 3A more detailed structure of the belt 7 is shown in FIG.

[0066] As in Figure 2 As can be seen in the figure, the belt 7 comprises a belt body 17 having a back side 19 and a traction side 21 opposite the back side 19, with which the belt 7 contacts the drive wheel 11. The belt body 17 can be made of an elastomeric material, in particular polyurethane, for example by extrusion (see further below).

[0067] A plurality of tension carriers 22 are embedded in the belt body 17, which bear the main part of the tension acting on the belt 7 during the operation of the elevator system 1. The tension carriers 22 are each completely made of aramid fibers 23 (see Figure 3 )form.

[0068] In this example, the strip 17 is designed to be flat on the rear side 19 . However, it is also possible for the strip 17 to be specially structured on the rear side 19 .

[0069] At the traction side 21, the belt body 17 has a groove profile 24 that matches the outer profile of the drive wheel 11, which in this example is formed by a plurality of elongated protrusions 25 and depressions 27, which are alternately distributed over the width B of the belt body 17. The respective longitudinal directions of the protrusions 25 and depressions 27 can extend parallel to the longitudinal direction of the belt body 17 (i.e., the belt 7).

[0070] Here, each tension carrier 22 can extend partially or completely inside one of the projections 25. For example, the cross-sectional area of ​​each projection 25 can include 60% to 90% (in the cross-sectional area of ​​the tension carrier 22 extending therein). Figure 2 , the cross-sectional area of ​​the projection 25 is separated from the rest of the belt body 17 by a horizontal dashed line). As a result, the belt 7 can be designed to be particularly flat.

[0071] For reasons of stability, each tensile force carrier 22 should be embedded in the strip 17 to such a depth that the strip material surrounding the tensile force carrier 22 is at least 1 mm thick at its thinnest point.

[0072] Optionally, an electrically conductive film 29 can be applied to the (flat) back side 19 for monitoring the belt 7 (in particular by measuring the resistance on the film 29). It is expedient if the film 29 extends over the entire length of the belt 17 (or the longitudinal section of the belt 17 that is important for monitoring). The film 29 can be in the form of individual tracks or as in Figure 2 As can be seen in FIG. 1 , it is applied to the rear side 19 in the form of two or more parallel tracks.

[0073] In particular, the profile height H of the corrugated profile 24 is Pcan be equal to the total height H of the belt 7 R Half of the total height H R In this example, the profile height H P The vertical distance (ie, perpendicular to the width B) between the highest point of the protrusion 25 and the lowest point of the depression 27 is equivalent to the total height H. R This corresponds to the vertical distance (ie, perpendicular to the width B) from the back side 19 to the traction side 21 , more precisely, to the vertical distance to the highest point of the protrusion 25 .

[0074] The tensile force carriers 22 can be arranged uniformly distributed over the width B (in addition, the tensile force carriers 22 can be arranged in a plurality of layers one above the other).

[0075] Overall height R It may be, for example, between 6.0 mm and 12.0 mm (plus or minus 0.1 mm), in particular between 7.4 mm and 10.5 mm (plus or minus 0.1 mm).

[0076] Profile height H P For example, it may be between 4.5 mm and 8.5 mm (plus or minus 0.1 mm), in particular between 4.8 mm and 7.9 mm (plus or minus 0.1 mm).

[0077] For example, the width B may be between 30.0 mm and 60.0 mm (plus / minus 0.5 mm), in particular between 33.0 mm and 48.0 mm (plus / minus 0.5 mm).

[0078] Diameter D of the tension carrier 22 Z It can be, for example, between 4.00 mm and 9.00 mm (plus or minus 0.02 mm), in particular between 5.40 mm and 7.70 mm (plus or minus 0.02 mm). Z Can be at least equal to the total height H R 70% of the total.

[0079] The distance a (in the direction of the width B) between adjacent tensile carriers 22 can be, for example, between 7.0 mm and 14.0 mm (plus or minus 0.1 mm), in particular between 8.4 mm and 12.0 mm (plus or minus 0.1 mm).

[0080] The distance A (in the direction of the width B) between the two outermost tensile force carriers 22 can be, for example, between 20.0 mm and 45.0 mm (plus / minus 0.2 mm), in particular between 25.2 mm and 36.0 mm (plus / minus 0.2 mm).

[0081] The tension carrier 22 can be designed in a rope shape and includes a first tension carrier 22a having a twist direction S (in Figure 2 and a second tension carrier 22b ( Figure 2 R is used to mark the right-hand rope.

[0082] The first tensile force carriers 22 a and the second tensile force carriers 22 b may be arranged alternately in the direction of the width B. In this way, it is possible to suppress the inclination of the belt 7 due to torsion under load.

[0083] Furthermore, as many first tension carriers 22a as second tension carriers 22b can be embedded in the belt body 17, here three in each case, ie a total of six tension carriers 22. An even number of tension carriers 22 can further improve the running behavior of the belt 7 under load.

[0084] Furthermore, at least one steel tensile carrier (not shown) may be embedded in the belt body 17. The steel tensile carrier may be used for monitoring the belt 7 (in addition or alternatively to the above-mentioned membrane 29).

[0085] like Figure 3 As shown, each tensile force carrier 22 may be formed by a plurality of strands 31 , which may be twisted together in a twist direction S or Z.

[0086] The strand 31 may in turn be formed from a plurality of aramid fibers 23 twisted together.

[0087] For example, the strands 31 may include a thicker central strand 31a and a plurality of (six, here) thinner outer strands 31b, wherein the outer strands 31b may be distributed around the central strand 31a at uniform tangential intervals (ie, uniformly along the circumferential direction of the central strand 31a).

[0088] The diameter d of the center strand 31a M For example, it can be between 1.50 mm and 3.50 mm (plus or minus 0.01 mm), in particular between 2.05 mm and 2.90 mm (plus or minus 0.01 mm).

[0089] The diameter d of the outer strand 31b A For example, it can be between 1.50 mm and 3.50 mm (plus or minus 0.01 mm), in particular between 1.85 mm and 2.65 mm (plus or minus 0.01 mm).

[0090] For example, the diameter D of the driving wheel 11 T Can be compared to the diameter d M 80 to 120 times larger, especially 90 to 110 times larger.

[0091] The tangential spacing t between adjacent outer strands 31 b can be, for example, between 0.00 mm and 0.30 mm (plus or minus 0.01 mm), in particular between 0.10 mm and 0.15 mm (plus or minus 0.01 mm).

[0092] Apart from Figure 3 In addition to the illustrated embodiment of 1+6 tension carriers, in other embodiments, tension carriers having 1+5, 1+7 or other Warrington configurations (not shown) may be used.

[0093] To reduce the risk of fire, each tension carrier 22 can additionally be surrounded by a special flame-retardant sheath 33. The sheath 33 can be made of the same material as the strip 17 or a different material from the strip 17. The material of the sheath 33 can include polyurethane in particular and additionally at least one flame-retardant additive.

[0094] The belt 7 can be produced very efficiently by extrusion. A corresponding production method can include the following steps, for example.

[0095] In a first step, the (finished) tensile force carriers 22 are provided. In this case, the tensile force carriers 22 can be positioned relative to one another as they are to be located later in the belt 17 .

[0096] In a second step, the tensile force carrier 22 is locally heated at least in those sections embedded in the elastomeric material by extrusion thereof until a temperature between 120° C. and 160° C., preferably between 130° C. and 150° C., particularly preferably between 135° C. and 145° C. is measured there.

[0097] In the third step, the belt body 17 (and thus the belt 7) is formed. For this purpose, the elastomer material is extruded. Here, the preheated section of the tension carrier 22 is surrounded by the extruded elastomer material.

[0098] The third step can, for example, comprise a plurality of extrusion steps that follow one another in time. Thus, in a first extrusion step, first a base body can be formed, into which the tension carrier 22 is embedded. In a second extrusion step, the back side can be applied to the base body. Finally, in a third extrusion step, the traction side can be applied to the base body. The product of the third extrusion step then constitutes the (finished) belt 7.

[0099] However, the strip body 17 can also be formed in a single extrusion step.

[0100] Alternatively, the belt body 17 may be cast from an elastomeric material. Finally, it should be noted that terms such as "having" or "comprising" do not exclude other elements or steps, and that indefinite articles such as "a" or "an" do not exclude a plurality. Furthermore, it should be pointed out that features or steps described with reference to one of the above embodiments may also be used in combination with features or steps described with reference to other embodiments of the above embodiments. The reference signs in the claims should not be considered as limiting.

Claims

1. A belt (7) for carrying a travelling basket (5) and / or a counterweight (13) of an elevator installation (1), wherein: The belt (7) comprises: A belt body (17) having a traction side (21) for contacting a drive pulley (11) of an elevator system (1) and a back side (19) opposite the traction side (21), wherein the belt body (17) has a groove profile (24) on the traction side (21) adapted to the outer profile of the drive pulley (11) and has a profile on the back side (19) different from the groove profile (24); A plurality of tension carriers (22, 22a, 22b) embedded in a belt body (17) for transmitting tension, wherein each tension carrier (22, 22a, 22b) is composed of a plurality of strands (31, 31a, 31b) twisted together, and each strand (31, 31a, 31b) is composed of a plurality of metal fibers or non-metal fibers (23) twisted together.

2. The belt (7) according to claim 1, in, The profile height (H) of the groove profile (24) P ) is at least equal to the total height (H R ) half of the The strip body (17) is flat on the back side (19).

3. The belt (7) according to any one of the preceding claims, in, Each tension carrier (22, 22a, 22b) comprises a central strand (31a) and a plurality of, in particular six, outer strands (31b) surrounding the central strand (31a); and / or The diameter (d) of the thinnest strand among the strands (31, 31a, 31b) A ) and the diameter (d M ) is at least 0.8, in particular at least 0.

9.

4. The belt (7) according to any one of the preceding claims, in, The ratio of breaking load to belt width is greater than 2 kN / mm, in particular greater than 3 kN / mm, particularly preferably between 3.6 kN / mm and 3.75 kN / mm, and / or greater than 4 kN / mm, in particular greater than 5 kN / mm, particularly preferably between 5.2 kN / mm and 5.4 kN / mm.

5. The belt (7) according to any one of the preceding claims, in, The tension carrier (22, 22a, 22b) comprises at least one first tension carrier (22a) and at least one second tension carrier (22b), wherein the at least one first tension carrier and the at least one second tension carrier differ from each other in their twist directions (L, R).

6. The belt (7) according to claim 5, in, The tension carriers (22, 22a, 22b) include a plurality of first tension carriers (22a) and a plurality of second tension carriers (22b), wherein the plurality of first tension carriers and the plurality of second tension carriers are dispersedly arranged over a width (B) of the belt body (17), wherein at least one of the second tension carriers (22b) is arranged between adjacent first tension carriers (22a).

7. The belt (7) according to any one of the preceding claims, in, At least four tension carriers (22, 22a, 22b) are embedded in the belt body (17); and / or The number of tension carriers (22, 22a, 22b) embedded in the belt body (17) is an even number.

8. The belt (7) according to any one of the preceding claims, in, A film (29) of an electrically conductive material, in particular copper, is applied to the rear side (19).

9. The belt (7) according to any one of the preceding claims, in, At least one steel tensile carrier is additionally embedded in the strip (17).

10. The belt (7) according to any one of the preceding claims, in, Each tensile force carrier (22, 22a, 22b) has a flame-retardant encapsulation (33), in particular a flame-retardant polyurethane encapsulation (33).

11. The belt (7) according to any one of the preceding claims, in, The groove profile (24) is formed by a plurality of raised portions (25) and recessed portions (27); Each of the tensile force carriers (22, 22a, 22b) engages in one of the projections (25), so that the cross-sectional area of ​​the projection (25) comprises at least half of the cross-sectional area of ​​the tensile force carrier (22, 22a, 22b).

12. The belt (7) according to any one of the preceding claims, in, The diameter (D) of each tension carrier (22, 22a, 22b) Z ) at least equal to the total height (H R ).

13. A method for producing a belt (7) for carrying a travelling basket (5) and / or a counterweight (13) of an elevator installation (1), in particular a belt (7) according to any one of the preceding claims, wherein: The method comprises: A plurality of tension carriers (22, 22a, 22b) for transmitting tension are provided, each tension carrier (22, 22a, 22b) is composed of a plurality of strands (31, 31a, 31b) twisted together, and each strand (31, 31a, 31b) is composed of a plurality of aramid fibers (23) twisted together; Preheating the tension carrier (22, 22a, 22b) to a temperature between 120°C and 160°C, preferably between 130°C and 150°C, particularly preferably between 135°C and 145°C; By embedding a preheated tension carrier (22, 22a, 22b) into an elastomeric material by extruding the elastomeric material, a belt body (17) with the tension carrier (22, 22a, 22b) embedded therein is formed, the belt body having a traction side (21) for contacting a drive wheel (11) of the elevator system (1) and a back side (19) opposite the traction side (21).

14. The method according to claim 13, The steps of forming the belt body (17) include: The base body is formed by embedding the preheated tensile force carrier (22, 22a, 22b) into the elastomeric material by extruding the elastomeric material in a first extrusion step; The strip body (17) is formed by applying the traction side (21) and the back side (19) to the base body in at least one second extrusion step by re-extruding the elastomeric material.

15. An elevator device (1), comprising: The belt (7) according to any one of claims 1 to 12; Elevator shaft (3); A travel basket (5) arranged in a movable manner in an elevator shaft (3), wherein a belt (7) carries the travel basket (5); and / or A counterweight (13) is arranged movably in an elevator shaft (3), wherein a belt (7) carries the counterweight (13).

16. Elevator installation (1) according to claim 15, It also includes a driving wheel (11), wherein: The belt (7) contacts the drive wheel (11) with its traction side (21), and the diameter (D T ) is larger than the diameter (d) of the thickest strand (31, 31a, 31b) of the belt (7) A d M ) 80 to 120 times greater, in particular 90 to 110 times greater; and / or The travel basket (5) comprises its own brake (15), which is designed to brake and / or stop the travel basket (5) during normal operation of the elevator system (1); and / or A further drive wheel (11) is also included, wherein the belt (7) contacts the further drive wheel (11) with its traction side (21).

Images