ELEVATOR SYSTEM

Abstract

A method determines a status of at least one component of an elevator system, wherein the elevator system includes a suspension apparatus having at least one traction member. The at least one traction member is surrounded by a non-metallic cladding, wherein the suspension apparatus is guided via a drive sheave with a metallic traction surface. The method includes the steps of: identifying at least one parameter based on an electrostatic effect which occurs due to friction of the non-metallic cladding on the traction sheave with the metallic traction surface; and determining a status of the at least one component on the basis of the identified parameter.

Claims

1-15. (canceled)

16. A method for determining a state of at least one component of a suspension apparatus of an elevator system, wherein the suspension apparatus has at least one tension load-carrying member, which is surrounded by a non-metallic jacket, and wherein the suspension apparatus is guided by a drive pulley with a metallic traction surface, the method comprising the steps of: determining at least one parameter based on an electrostatic effect that arises as a result of friction between the non-metallic jacket and the metallic traction surface of the drive pulley during a journey of the elevator system; determining a state of the at least one component of the elevator system on the basis of the at least one parameter; and transmitting the state of the at least one component to an elevator controller for controlling the elevator system.

17. The method in accordance with claim 16 wherein the suspension apparatus includes at least one electrically conducting element.

18. The method in accordance with claim 17 wherein the at least one tension load-carrying member includes plastic fibers, and wherein the at least one electrically conducting element is an indicator element arranged in the suspension apparatus.

19. The method in accordance with claim 17 wherein the at least one electrically conducting element is the at least one tension load-carrying member formed of an electrically conducting material.

20. The method in accordance with claim 17 wherein the at least one parameter is at least one of an electrical voltage and an electrical current in the at least one electrically conducting element.

21. The method in accordance with claim 16 wherein the state is a loading state of the suspension apparatus.

22. The method in accordance with claim 21 including detecting a relaxation of stress in the suspension apparatus from the loading state of the suspension apparatus.

23. The method in accordance with claim 21 wherein the elevator system includes at least two of the suspension apparatus, and including detecting a distribution of a load onto the at least two suspension apparatuses from the loading state.

24. The method in accordance with claim 16 wherein the state is a running state of an elevator car suspended by the suspension apparatus.

25. The method in accordance with claim 24 wherein the running state is a speed of travel of the elevator car.

26. The method in accordance with claim 24 wherein the running state is at least one of a duration of a journey of the elevator car and a number of journeys of the elevator car.

27. The method in accordance with claim 16 wherein the state is a state of the jacket of the suspension apparatus.

28. The method in accordance with claim 27 wherein the state of the jacket represents at least one of any contamination of a surface of the jacket, a wear of the jacket surface, and an ageing of the jacket surface.

29. The method in accordance with claim 17 wherein the at least one electrically conducting element is the at least one tension load-carrying member formed of an electrically conducting material and the state is a state of the at least one tension load-carrying member.

30. The method in accordance with claim 29 wherein the state represents at least one of any contact of the at least one tension load-carrying member with an earthed element and a fracture of the at least one tension load-carrying member.

Description

DESCRIPTION OF THE DRAWINGS

[0018] With the aid of figures the invention is described symbolically and in an exemplary manner in more detail. Here:

[0019] FIG. 1 shows an exemplary form of embodiment of an elevator system; and

[0020] FIG. 2 shows an exemplary form of embodiment of a suspension means; and

[0021] FIG. 3a shows an exemplary form of embodiment of a suspension means; and

[0022] FIG. 3b shows an exemplary form of embodiment of a suspension means.

DETAILED DESCRIPTION

[0023] The elevator system 40 represented schematically and in an exemplary manner in FIG. 1 features an elevator car 41, a counterweight 42 and a means of suspension 1, together with a drive pulley 43 with an associated drive motor 44. The drive pulley 43 drives the suspension means or suspension apparatus 1 and thus moves the elevator car 41 and the counterweight 42 in opposition. The drive motor 44 is controlled by an elevator controller 45. The car 41 is configured to accommodate people or goods, and to transport these between floors of a building. Car 41 and counterweight 42 are guided along guides (not represented). In the example the car 41 and the counterweight 42 are each suspended on load-bearing rollers 46. Here the suspension means 1 is secured to a first suspension means attachment device 47, and is then firstly guided around the load-bearing roller 46 of the counterweight 42. The suspension means 1 is then laid over the drive pulley 43, around the load-bearing roller 46 of the car 41, and is finally connected by means of a second suspension means attachment device 47 to a fixed point. This means that the suspension means 1 runs with a higher speed in accordance with a transfer factor over the drive 43, 44, than the car 41 or counterweight 42 move. In the example the transfer factor is 2:1.

[0024] A free end 1.1 of the suspension means or suspension apparatus 1 is provided with a contact device 2 for purposes of making temporary or permanent electrical contact with the tension load-carrying members 1. In the example represented such a contact device 2 is arranged at both ends 1.1 of the suspension means 1. In an alternative form of embodiment, not represented, only one contact device 2 is arranged at one of the ends 1.1 of the suspension means, and the tension load-carrying members are connected with one another at the other end 1.1 of the suspension means. The suspension means ends 1.1 are no longer loaded by the tensile force in the suspension means 1, since the said tensile force is already previously directed via the suspension means attachment devices 47 into the building. The contact devices 2 are therefore arranged in a region of the suspension means 1 that is not rolled over, and outside the loaded region of the suspension means 1.

[0025] In the example the contact device 2 is connected at one end 1.1 of the suspension means or apparatus with a monitoring device 3. The monitoring device 3 thereby interconnects the tension load-carrying members of the suspension means 1 as electrical conductors in electrical circuitry for purposes of determining an electrical parameter, which can be, for example, an electrical voltage and/or an electrical current. The monitoring device 3 is also connected with the elevator controller 45. This connection can, for example, be designed as a parallel relay or as a bus system. By this means a signal or a measured value from the monitoring device 3, can be transmitted to the elevator controller 45, in order to take account of the state of at least one component of the elevator system 40, as determined by the monitoring device 3, in controlling the elevator 40.

[0026] During a journey of the elevator car 41 the non-metallic jacket of the suspension means or suspension apparatus 1 interacts with the metallic traction surface of the drive pulley 43. Here, a movement of the drive pulley 43 is transferred by means of traction onto the suspension means. During this transfer an electrostatic effect arises, wherein the metallic drive pulley delivers electrons onto the non-metallic belt jacket. As a result different charges can be established in the elements affected of the elevator system 40. Here the electrical voltage, which builds up on the jacket of the suspension means 1, can discharge by way of an electrically conducting element, which is also located in the suspension means 1. The said electrical voltage in the suspension means 1, and/or its discharge by way of the electrically conducting element, can now be determined by the monitoring device 3. On the basis of the said determined parameter of the electrostatic effect, a state can now be determined for a component to be monitored of the elevator system 40.

[0027] It has been shown in tests, for example, that the running state of the car, such as for example, the speed of travel of the car 41, has a direct influence on a parameter based on the electrostatic effect. By determining such a parameter, conclusions can thereby be drawn concerning the speed of travel of the elevator car 41.

[0028] Furthermore it has also been shown that a voltage of the suspension means or suspension apparatus 1 has a direct influence on parameters based on the electrostatic effect. If a suspension means 1 is relaxed, for example, which can occur in a fastening or fitting of the elevator car 41 or the counterweight 42, a parameter of the electrostatic effect turns out to be smaller than is the case with normally loaded suspension means 1.

[0029] Furthermore a state of the jacket of the suspension means or suspension apparatus 1 has a direct influence on a parameter based on the electrostatic effect. If, for example, the said jacket is rough or dirty, this has a direct influence on the transfer of electrons from the drive pulley 43 onto the jacket of the suspension means 1. Here too a parameter determined can be used to deduce a state of the jacket of the suspension means 1.

[0030] Furthermore a state of tension load-carrying members, which are arranged in a jacketing of the suspension means or suspension apparatus 1, can also be determined. Since the tension load-carrying members of the suspension means 1 are used as electrical conductors for purposes of determining a parameter in conjunction with the electrostatic effect, an interruption of such an electrical conductor, or an earthing leakage in such an electrical conductor to an earthed component of the elevator system 40 can, for example, be detected. Thus, by the determination of a parameter in conjunction with the electrostatic effect a conclusion can be indirectly drawn concerning a state of the tension load-carrying members in the suspension means 1.

[0031] FIG. 2 represents a section of an exemplary form of embodiment of a suspension means or suspension apparatus 1. The suspension means 1 comprises a plurality of electrically conducting tension load-carrying members 5 arranged parallel to one another, which are encased in a jacket 6. For purposes of making electrical contact with the tension load-carrying members 5 the jacket 6 can, for example, be pierced or removed, or electrical contact can also be made with the tension load-carrying members 5 on their end faces with a contact device 2.

[0032] In this example the suspension means or suspension apparatus is fitted with longitudinal ribs on a traction face. Such longitudinal ribs improve the traction characteristics of the suspension means 1 on the drive pulley 43, and at the same time ease the lateral guidance of the suspension means 1 on the drive pulley 43. The suspension means 1 can, however, be configured in another manner, for example, without longitudinal ribs, or with another number, or another arrangement, of the tension load-carrying members 5. It is essential to the invention that the tension load-carrying members 5 are configured so as to be electrically conducting.

[0033] FIG. 3a represents a cross-section of a further exemplary form of embodiment of a suspension means or suspension apparatus 1. The suspension means 1 comprises an electrically non-conducting tension load-carrying member 5, which is encased in a jacket 6. In the electrically non-conducting tension load-carrying member 5 is arranged an indicator element 7, which is designed to be electrically conducting. For purposes of making electrical contact with the indicator element 7 the jacket 6 and the tension load-carrying members 5 can, for example, be pierced or removed, or the indicator element 7 can also make electrical contact on the end face of a contact device 2.

[0034] FIG. 3b represents a cross-section of a further exemplary form of embodiment of a suspension means or suspension apparatus 1. The suspension means 1 comprises two electrically conducting tension load-carrying members 5, which are encased in a jacket 6. Here one tension load-carrying member 5 is advantageously embodied in an S-twist, and the other tension load-carrying member 5 in a Z-twist. By this means it is achieved that the directions of lay are lifted such that under load the suspension means is not pulled out of the groove of the drive pulley. For purposes of making electrical contact with the tension load-carrying members 5 the jacket 6 can, for example, be pierced or removed, or electrical contact can also be made with the tension load-carrying members 5 on their end faces with a contact device 2.

[0035] In accordance with the provisions of the patent statutes, the present invention has been described in what is considered to represent its preferred embodiment. However, it should be noted that the invention can be practiced otherwise than as specifically illustrated and described without departing from its spirit or scope.