EP1764335A2 - Elevator with drive sheave and belt like carrier means. - Google Patents

Elevator with drive sheave and belt like carrier means. Download PDF

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Publication number
EP1764335A2
EP1764335A2 EP06120689A EP06120689A EP1764335A2 EP 1764335 A2 EP1764335 A2 EP 1764335A2 EP 06120689 A EP06120689 A EP 06120689A EP 06120689 A EP06120689 A EP 06120689A EP 1764335 A2 EP1764335 A2 EP 1764335A2
Authority
EP
European Patent Office
Prior art keywords
drive pulley
support means
flat belt
friction
belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06120689A
Other languages
German (de)
French (fr)
Other versions
EP1764335A3 (en
Inventor
Ernst Ach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inventio AG
Original Assignee
Inventio AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP05108680 priority Critical
Application filed by Inventio AG filed Critical Inventio AG
Publication of EP1764335A2 publication Critical patent/EP1764335A2/en
Publication of EP1764335A3 publication Critical patent/EP1764335A3/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B7/00Other common features of elevators
    • B66B7/06Arrangements of ropes or cables
    • B66B7/062Belts

Abstract

The elevator system has an elevator car, a drive belt sheave, and at least one flat-belt-like carrying device driven by the drive sheave, for carrying and moving the elevator car. The running surface of the drive sheave, against which the flat-belt-like carrying device lies is coated with a friction-reducing coating, such as chrome, or its surface is treated to reduce friction, e.g. by providing spherical microstructures. An independent claim is included for a drive sheave.

Description

  • The invention relates to an elevator system with an elevator car, a drive pulley and a flat belt-like support means, wherein the flat belt-like support means carries the elevator car and the counterweight and is driven by the drive pulley.
  • Out EP 1 169 256 B1 a drive pulley for driving a plurality of parallel flat belt-like support means of an elevator system is known whose treads have a circumferentially measured surface roughness of 1 micron to 3 microns (microns), so that an increased and defined traction capability of the elevator drive is ensured. According to one of the disclosed embodiments, the running surfaces of the drive pulley, ie, those surface portions of the drive pulley which radially support and frictionally drive the flat belt type support means, are provided with a corrosion resistant and wear resistant surface coating whose surface roughness corresponds to the above values.
  • The application of such a drive pulley is associated with disadvantages and problems in certain applications. When used for driving flat belt-like suspension means, which have a belt sheath made of rubber or of a suitable elastic plastic, results in a high traction between the drive pulley and the support means, since the coefficient of friction occurring between metallic disc materials and said materials of the belt jacket is substantially higher than the coefficient of friction between steel wire ropes and metallic pulleys. This can lead to functional and safety problems in the operation of a lift system with a counterweight. For example, there is a risk that the elevator car will still be further raised by the drive pulley and the suspension means when the counterweight is stopped by its lower stop buffer due to a control error. Such a situation can practically lead to a free fall of the cabin when, after a certain lifting distance, the traction force between the drive pulley and support means is largely removed due to the lack of counterweight force. In addition, the high traction capability prevents that in lift systems with several parallel suspension element strands even at low load differences, a load balance between the suspension element strands takes place. Harmful overloading in individual suspension element strands can result from this. In a drive arrangement according to
    EP 1 169 256 B1 with a belt-like support means and a drive pulley, which interact via running surfaces without guide grooves and guide ribs, a not necessarily required for the traction high friction between the drive pulley and the flat belt also means that usually with the help of side flanges and / or transverse curved pulleys of the pulleys caused lateral guidance of the flat belt on the pulleys failed because these belt guidance methods always require a sliding action between the flat belt and the pulley.
  • The invention has for its object to propose an elevator system of the type mentioned, which does not have the above-mentioned disadvantages of an elevator system, in which the traction between the drive pulley and flat belt-like support means is higher than is absolutely necessary for safe elevator operation. In particular, therefore, an elevator system is to be created in which the elevator car can not be further raised by the flat belt-like support means when the counterweight is seated on its lower stop buffer, in which a load balance between several suspension strands is ensured secure, and in which the lateral guidance of the flat belt-like Support means on the drive pulley is easier.
  • In flat belt-like support means and drive pulleys, which are provided for the purpose of safe lateral guidance of the support means, for example, with V-shaped ribs and grooves, the problems arise with the lifting of the car with blocked counterweight and with the insufficient load compensation on. The reason for this is that as a result of the wedge action occurring between the rib flanks of the suspension element and the groove flanks of the drive belt pulley a substantial increase in the transmittable traction force results.
  • According to the invention the object is achieved in that in an elevator system, the at least one drive pulley and at least one flat belt-like suspension means comprising the elevator car and the counterweight and driven by the drive pulley, at least one running surface of the drive pulley over which the suspension means is supported and radially supported, provided with a friction reducing coating, or subjected to a friction reducing surface treatment.
  • In the following, coatings or surface treatments of a running surface of the drive belt pulley are referred to as "friction-reducing", with the result that the coated or surface-treated running surface has a lower coefficient of friction compared to the flat belt-type suspension element than the material of the main body of the drive belt pulley.
  • The invention is therefore based on the idea that the above-mentioned disadvantages and problems associated with flat belt-type support means made of rubber or elastic plastics due to excessive friction between support means and drive pulleys, thereby repairing that provided the running surfaces of the drive pulleys with friction-reducing coatings or a friction reducing surface treatment.
  • The advantages achieved by the invention are essentially to be seen in that
    • the risk that the elevator car will be further raised by the drive and the suspension means when the counterweight due to a control error by his bottom stop buffer is stopped, virtually eliminated,
    • a necessary balance between the load forces of the individual suspension element strands is better ensured, and
    • the problems with the lateral guidance of the flat belt-like support means on the drive pulleys due to high friction between the drive pulley and the support means are reduced.
  • Advantageous embodiments and further developments of the invention will become apparent from the subclaims and are described below:
  • In a particularly preferred embodiment of the elevator installation according to the invention, the flat belt-like support means comprises a jacket with a substantially rectangular cross-section made of an elastic plastic or rubber, in which sheath traction means in the form of steel wires, fiber strands or flat fiber fabrics are embedded.
  • An excellent lateral guidance of the support means on the drive pulley is achieved in an elevator system according to the invention, in which
    • the flat belt-like support means has ribs and grooves in the region of its running surface, which extend in the longitudinal direction of the suspension element,
    • the drive pulley on its periphery has ribs and grooves extending in the circumferential direction of the drive pulley and
    • the cross-sections through the ribs and grooves of the support means and the drive pulley have outer contours, which are at least partially complementary to each other.
  • An excellent smoothness of the flat belt-like support means results in an embodiment of the invention, in which between the ribs and grooves of the drive pulley and the ribs and grooves of the support means Teilaufaufflächen are present, via which the support means is supported on the drive pulley, wherein at least a portion of these partial contact surfaces are arranged neither cylindrical nor perpendicular to a rotational axis of the drive pulley. The term "partial contact surfaces" is understood to mean individual contact surfaces between a drive belt pulley and a flat belt-type suspension element, which are present as a result of a profiling of the drive belt pulley and of the corresponding suspension element.
  • According to a preferred embodiment of the invention, the ribs and grooves of the flat belt-like support means on V-shaped or trapezoidal cross-sections.
  • Best possible running properties of the support means with poor mutual alignment of drive pulley and support means are achieved when it is the flat belt-like support means is a V-ribbed belt having a plurality of laterally adjoining ribs and grooves with v-shaped cross-section.
  • Advantageously, the running surfaces of the drive pulley, over which the support means is supported radially on this, at least in some areas a chromium coating on, whereby the achievable between the support means and the drive belt traction power is reduced.
  • Outstanding wear resistance as well as low and particularly stable coefficients of friction between the drive belt pulley and the suspension element are achievable in an elevator system according to the invention if the chromium coating is a chromium coating galvanically produced by the topochrome process whose surface has dome-shaped microstructures.
  • Appropriate solutions to the problem of excessive friction between drive pulley and support means can also be achieved in that the running surfaces of the drive pulley, over which the support means supported radially on this, at least in some areas one of the following types of friction-reducing coatings, or surface treatments:
    • Coating of amorphous carbon, known as DLC (Diamond-Like-Carbon)
    • Teflon coating
    • ceramic coating
    • Carbo-nitride oxidation as a surface treatment
  • Lowest possible noise and vibration-free running of the flat belt-like support means are achieved in elevator systems, in which also the running surfaces or the partial contact surfaces of the support means deflection rollers coated friction reducing or surface-treated friction reducing. Embodiments of the invention are explained below with reference to the accompanying drawings.
  • Show it:
  • Fig. 1
    a drive pulley with slightly curved treads for several flat belt-like support means.
    Fig. 2
    a drive pulley with bearing support means, wherein the running surfaces of the drive pulley and the support means in the circumferential direction or in the longitudinal direction of the support means extending ribs and grooves.
    Fig. 3
    a drive pulley with overlying support means, wherein the drive pulley as well as the supporting means ribs and grooves having trapezoidal cross-section.
    Fig. 4
    a drive pulley with a V-ribbed belt as a support means.
    Fig. 5
    a schematic, greatly enlarged section through a coated according to the topochromic process running surface of a drive pulley.
    Fig. 6
    a schematic, greatly enlarged view of the surface of a coated according to the topochromic process running surface of a drive pulley.
  • In Fig. 1, a drive pulley 10 is shown with a plurality of flat belt-like support means 11. The running surfaces 12 of the drive pulley 10 are slightly curved transversely to the circumferential direction, whereby a certain degree of self-centering of the support means 11 in the center of the respective tread 12th is reachable. The centering effect depends inter alia on the level of the coefficient of friction between the support means 11 and the running surfaces 12 of the drive pulley 10, ie a high coefficient of friction hinders an optimal centering effect of the tread curvature. In order to achieve the best possible self-centering of the support means 11 on the drive pulley 10, but also to avoid the above-described dangerous lifting the elevator car with blocked counterweight and to ensure the load balance between the support means 11, the treads 12 are friction-coated or surface-treated friction reducing. Different possibilities for realizing such a coating or surface treatment will be discussed later.
  • The drive pulley 10 shown in Fig. 1 is also provided with a plurality of flanged wheels 13 which form an additional assurance that the flat belt-like support means 11 remains centered during the elevator operation on its associated tread 12 of the drive pulley 10.
  • Drive pulleys of the type shown in Fig. 1 require a precise mutual alignment of all involved in the drive and the deflection of the flat belt-like suspension means pulleys. If such an orientation is not sufficiently precise, the flat belt-like support means 11 rubs with its side surfaces on the flanged wheels 13, which can lead to destruction of the suspension element by abrasion or by rising of the side portion of the support means 11 on a flanged wheel 13. The choice of least possible, the function of traction transmission still sufficiently ensuring friction between the running surfaces of the drive belt pulleys and the support means can affect the life of the support means decisively positive. Advantageously, the flanged wheels 13 of the drive belt pulleys 10 are friction-reduced coated or treated.
  • It is expedient to friction-coat or treat the running surfaces and / or flanges of pulleys of an elevator installation in order to achieve the best possible centering of the support means on the running surfaces and a vibration-free, smooth running of the support means while the wear of the support means so low as possible. This also applies in particular to deflection rollers which have ribs and grooves in the circumferential direction in order to guide support means laterally with at least partially complementary ribs and grooves, as described below.
  • Fig. 2 shows a drive pulley 20 with lying on it flat belt-like support means 21, the running surfaces 22 have ribs and grooves extending in the circumferential direction of the drive pulley 20 and in the longitudinal direction of the support means 21, wherein the ribs and grooves may have almost any cross-sectional shapes. The purpose of these ribs and grooves is to guide the support means 21 on the drive pulley 20 without requiring high accuracy of the mutual alignment of the pulleys and the support means. The ribs and grooves of the drive pulley 20 are formed at least in partial areas complementary to the ribs and grooves of the support means 21, wherein these subregions form part contact surfaces 25, via which the suspension element is supported on the drive pulley 20. A substantial portion of the partial contact surfaces 25 is not cylindrical with respect to the axis of rotation 24 of the drive pulley, but arranged inclined relative to this axis of rotation. Since a substantial portion of the radial forces occurring between the drive pulley 20 and the support means 21 are transmitted via such inclined portions of the partial contact surfaces 25, increased traction capability between the drive pulley 20 and the support means 21 results due to a type of wedging action. The process of increasing traction capability known from the use of V-belts. In order to avoid the disadvantages of an increased traction capability explained in the introduction, according to the invention the running surfaces 22 or partial running surfaces 25 of the drive belt pulley are friction-coated or surface-treated in a friction-reducing manner.
  • Fig. 3 shows a further embodiment of a drive pulley 30 with a flat belt-like support means resting thereon 31, wherein the disc as well as the support means ribs and grooves having trapezoidal cross-section. In order to achieve a smooth running and a secure lateral guidance of the support means 31 on the drive pulley 30, the support means is supported on the oblique lateral edges of its trapezoidal ribs on the corresponding oblique edges of the grooves of the drive pulley on the drive pulley. The aforementioned oblique flanks form here a plurality of partial contact surfaces 35. Also in this embodiment results due to the wedging action between the ribs of the support means and the Grooving the drive pulley increases traction. In order to avoid the disadvantages of this increase in traction capability, according to the invention, at least the oblique flanks 35 of the grooves of the drive pulley 30 forming several partial contact surfaces are friction-coated or surface-treated in a friction-reducing manner.
  • Fig. 4 shows a particularly preferred embodiment of a drive pulley 40 and an associated flat belt-like support means 41, wherein the drive pulley as well as the support means ribs and grooves having a substantially triangular cross-section. The jacket 46 of the flat belt-like support means is made of rubber or of an elastic plastic, preferably of polyurethane or EPDM (Ethylene Propylene Diene monomer). In the illustrated cross-section of the support means round tensile reinforcements 47 can be seen, which may for example consist of steel wire strands or synthetic fiber strands. The embodiment shown here of the flat belt-like support means 41, which is known under the name V-ribbed belt, characterized by excellent smoothness and can be easily, safely and wear low on the pulleys of the elevator system even with relatively inaccurate mutual alignment of the pulleys of the elevator system and the support means , Good operating characteristics are achieved with V-ribbed belts whose wedge angles β are between 60 ° and 120 °, achieving optimum results with wedge angles of 80 ° to 100 °. Also in this embodiment of the drive pulley and the flat belt-like support means, the support means 41 is supported by inclined flanks, ie about the axis of rotation 44 of the drive pulley 40 inclined arranged partial contact surfaces 45, 40 on the drive pulley. On the one hand, this results in the excellent running and guiding properties of this suspension arrangement and, on the other hand, the known increase in traction capability with its disadvantages explained above. Lower wedge angle values β give better characteristics with respect to the lateral guidance of the support means on the drive pulley, but they cause a greater increase in traction between the drive pulley and the support means. In order to avoid the disadvantages of increased traction, the triangular ribs and grooves of the drive pulley are friction-coated or surface-treated to reduce friction.
  • 5 shows a greatly enlarged section through a tread 50 or partial running surface of a drive belt pulley coated friction-reducing according to the topochrome process, and FIG. 6 shows a greatly enlarged view of the surface of such a tread or partial running surface coated according to the topochrome process.
    The topochrome coating is a chromium layer applied galvanically to a base material 51 (drive belt pulley 10, 20, 30, 40), in which dome-shaped microstructures 53 grown out of a base chrome layer 52 form a structural layer 54 which is covered by a thin end layer 55 (FIG. made of chrome). The formation of the dome-shaped microstructures 53 with diameters of typically less than 0.1 mm is achieved by suitable manipulation of the process parameters (current, Temperature, flow velocity of the electrolyte) during the galvanic coating process.
    In comparison with machined metal surfaces or other galvanically coated surfaces results in sliding friction between any friction and a friction body whose surface has said dome-shaped microstructures, a greatly reduced coefficient of friction. Thanks to the large amount of supporting microstructure surfaces on the entire surface in the topochromic coating, the coated friction body, ie in the present case the running surface of a drive pulley or a deflection roller, also has an excellent wear resistance.
  • Of course, some other methods are also suitable for the friction-reducing coating or the friction-reducing surface treatment according to the invention in drive pulleys in elevator installations. Examples of such methods are:
    • Coating of amorphous carbon, known as DLC (Diamond-Like-Carbon)
    • Teflon coating
    • ceramic coating
    • Carbo-nitride oxidation as a surface treatment

Claims (11)

  1. Elevator installation comprising an elevator cage, a drive pulley and at least one flat belt-like suspension element which is driven by the drive pulley and supports and moves the elevator cage,
    characterized,
    in that a running surface or a partial running surface of the drive belt pulley (10, 20, 30, 40), by means of which the flat belt-like support means (11, 21, 31, 41) is supported on the drive belt pulley (10, 20, 30, 40), is friction-coated or friction-reducing surface-treated.
  2. Lift installation according to claim 1, characterized in that the flat belt-like support means (41) comprises a sheath made of an elastic plastic or rubber having a substantially rectangular cross-section, in which sheath traction means (47) are embedded in the form of steel wires, fiber strands or flat fiber fabrics.
  3. Elevator installation according to claim 1 or 2, characterized in that
    - The flat belt-like support means (21, 31, 41) in the region of its tread ribs and grooves which extend in the longitudinal direction of the support means,
    - The drive pulley (20, 30, 40) on its periphery ribs and grooves which extend in the circumferential direction of the drive pulley (20, 30, 40) and
    the cross-sections through the ribs and grooves of the support means (21, 31, 41) and the drive pulley (20, 30, 40) have outer contours that are at least partially complementary to each other.
  4. Elevator installation according to claim 3, characterized in that between the ribs and grooves of the drive pulley (20, 30, 40) and the ribs and grooves of the flat belt-like support means (21, 31, 41) partial contact surfaces (25, 35, 45) are present, over which supports the support means (21, 31, 41) on the drive pulley (20, 30, 40), at least a portion of said part contact surfaces (25, 35, 45) being neither cylindrical nor perpendicular to an axis of rotation (24, 44) of the drive pulley (20, 30, 40) are arranged.
  5. Lift installation according to claim 4, characterized in that the ribs and grooves of the flat belt-like support means (31) and the drive pulley (30) have V-shaped or trapezoidal cross-sections.
  6. Lift installation according to claim 4, characterized in that the flat belt-like support means (41) is a plurality of laterally adjoining ribs and grooves with v-shaped or triangular cross-section.
  7. Elevator installation according to one of claims 1 to 6, characterized in that the running surfaces or the partial contact surfaces of the suspension element deflection rollers of the elevator installation are friction-reduced coated or surface-treated to reduce friction.
  8. Drive pulley (10, 20, 30, 40) for driving a flat belt-like support means (11, 21, 31, 41) of an elevator installation, characterized in that a running surface or a partial contact surface of the drive pulley (10, 20, 30, 40), via which the flat belt-like support means (11, 21, 31, 41) on the drive pulley (10, 20, 30, 40) is supported, at least partially friction-coated or friction-reducing surface-treated.
  9. A drive pulley (10, 20, 30, 40) according to claim 8, characterized in that a running surface (12) or a part running surface (25, 35, 45) of the drive pulley (10, 20, 30, 40) over which the flat belt-like Supporting means (11, 21, 31, 41) on the drive pulley (10, 20, 30, 40) is supported, at least in some areas has a chromium coating.
  10. Drive belt pulley (10, 20, 30, 40) according to claim 9, characterized in that it is the chromium coating is a galvanically produced by the topochrome process chromium coating, the surface of dome-shaped microstructures (53).
  11. Drive pulley (10, 20, 30, 40) according to claim 8, characterized in that a running surface (12) or a part running surface (25, 35, 45) of the drive pulley (10, 20, 30, 40), over which the Supporting means (11, 21, 31, 41) supported radially on this, at least in some areas one of the following types of friction-reducing coatings, or surface treatments have:
    Amorphous carbon coating known as DLC (Diamond-Like-Carbon)
    - Teflon coating
    - Ceramic coating
    - Carbo-nitride oxidation as a surface treatment.
EP06120689A 2005-09-20 2006-09-14 Elevator with drive sheave and belt like carrier means. Withdrawn EP1764335A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05108680 2005-09-20

Publications (2)

Publication Number Publication Date
EP1764335A2 true EP1764335A2 (en) 2007-03-21
EP1764335A3 EP1764335A3 (en) 2007-10-10

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EP06120689A Withdrawn EP1764335A3 (en) 2005-09-20 2006-09-14 Elevator with drive sheave and belt like carrier means.

Country Status (12)

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US (1) US20070062762A1 (en)
EP (1) EP1764335A3 (en)
JP (1) JP2007084341A (en)
KR (1) KR20070032922A (en)
CN (1) CN1935616A (en)
AU (1) AU2006220377A1 (en)
BR (1) BRPI0603830A (en)
CA (1) CA2560028A1 (en)
MX (1) MXPA06010753A (en)
NO (1) NO20063896L (en)
NZ (1) NZ549732A (en)
TW (1) TW200730743A (en)

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EP2574583A1 (en) 2011-09-30 2013-04-03 Inventio AG Reducing over-traction in an elevator
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JP2007084341A (en) 2007-04-05
BRPI0603830A (en) 2007-08-14
EP1764335A3 (en) 2007-10-10
US20070062762A1 (en) 2007-03-22
AU2006220377A1 (en) 2007-04-05
NZ549732A (en) 2008-02-29
CA2560028A1 (en) 2007-03-20
NO20063896L (en) 2007-03-21
KR20070032922A (en) 2007-03-23

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