Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
  • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
  • B66B5/0006—Monitoring devices or performance analysers
  • B66B5/0037—Performance analysers

Definitions

• the invention relates to a method for checking the effectiveness of Braking device in a rope pulley system having a traction sheave with a traction sheave drive having a lift control with a Frequency control, and with a load measuring device for determination the load in the car.
• Rope elevator systems are usually called traction sheave lifts built.
• the driving force is through Transfer frictional engagement between the traction sheave and the support cables.
• the Suspension cables are thereby stretched over the traction sheave and with this frictionally connected, that on the one hand on the suspension cables of the car and on the opposite other side of the suspension ropes a counterweight is provided.
• the counterweight is usually dimensioned in this way, that it corresponds to approximately half the rated load of the loaded car.
• the elevator drive always only needs a maximum of half the rated load lift, i. he only needs to be designed for this half nominal load.
• This braking device also needs the elevator in the de-energized state, i. if there is no drive energy, reliably hold at a standstill. Without the said braking device would the car is set in motion by gravity alone, in the direction in which the larger mass, i. the mass difference between Car and counterweight, is effective. For example, a would with less than half the nominal load loaded car from the counterweight pulled up until the counterweight in the elevator shaft at the bottom has arrived.
• the braking device of such a frequency-controlled drive wears Although in comparison to a braking device of an elevator drive with a pole-changing three-phase motor less; a non-excludable fraction of a Brake spring or other mechanical components of the braking device However, this would normally be the earliest at the next lift maintenance be noticed, since the remaining brake of the pair is the same trained braking the braking device hold the elevator at a standstill can. The said still remaining a brake of the two brakes Braking device would only be a "simple safety" and since the elevator continues to operate, is in a failure even the remaining second brake of the braking device guarantees an accident!
• WO 2004/035 448 A2 is a method for checking the effectiveness the braking device in a cable-lift system with a traction sheave drive and with a load measuring device for determining the load in the car known, wherein at certain times, when the car is empty and closed brake device, the current of the drive is measured at closed brake device, the traction sheave of the elevator system in rotation to move. The measured current value becomes with a reference current value compared.
• the invention is based on the object, a method of the aforementioned To create a way of checking the effectiveness of the braking device of frequency-controlled rope-lift equipment is simply possible to the To monitor braking effect of the braking device.
• Modern frequency controls regulate the current in the drive, i. through the Drive motor, exactly to the currently required value and are Therefore, at any time able to provide information about the size of the needed to give electricity. Even if this current measurement is not calibrated, but is a statement about it possible, whether the current through the drive motor remains the same or, for example, is greater than in the last elevator ride.
• the elevator control can be periodically, for example at intervals of a day, whenever the car is empty and unused, what with the help of the ever existing load measuring device is determinable, mandate the frequency controller to measure the current, which is necessary to the traction sheave of the rope elevator system when the brake device is closed to turn. If this current value is changed by e.g. more than 10% below the current value at the initial start-up of the elevator system, the Lift control take the elevator out of service and a defect of Signal braking device.
• the resources for this are at Frequency-controlled cable-lift systems available in any case.
• the two Braking the braking device are using the software in the Frequency control solved or closed.
• the elevator control can thus the Lift system automatically shut down, if the respective measured current value by a certain predetermined amount below the Reference current value is. This reference current value is expediently determined during the initial commissioning of the elevator installation.
• the frequency control by Measure the drive motor current flowing, which is necessary to brake against the brakes to cause a rotational movement.
• the frequency control by the drive motor flowing current that is needed to brake against one or the other to cause a rotational movement.
• the frequency control is able to do this offset, the two brakes of the braking device of the elevator independently to solve each other or to close. In this way, the braking effect each of the two brakes - measured by itself - judged and assessed "Brake failure" signaled.
• the latter inventive Procedure is particularly advantageous even when the drive to is weak, to act against the force of the two brakes, which mean would mean that a measurement would be impossible.
• the braking distance reference value is expediently at the first commissioning the elevator system determines.
• Modern elevator controls are equipped with a position measuring system with which it is possible to use a Carry out millimeter accurate braking distance measurement.
• the elevator control can now at regular intervals, for example at intervals of one Day when the car is empty, what with the help of the ever-present Load measuring device is detectable, a ride at rated speed perform and thereby trigger an emergency stop.
• the frequency-controlled Drive motor via the main contactors from the power supply, i. of the Frequency control separately - with the solenoids of the brake opening also be de-energized, and the brake is applied.
• the braking distance at one such emergency stop depends on the braking effect of the elevator brake and is therefore an indicator of the effectiveness of the braking device. A corresponding Increasing the braking distance then leads to the decommissioning of the Elevator.
• the emergency stop braking distance of the two Brakes with the brake device closed together or from each other separate and independent measure is provided.
• This emergency stop distance measurement can be performed automatically by the elevator control, preferably at regular intervals, are triggered. The same is true it is possible for the emergency stop distance measurement to be performed by maintenance personnel, i. from Maintenance technician, is triggered.
• the reference current value and / or the emergency stop braking distance reference value and become the current measured values of the current value and / or the emergency stop braking path stored in a memory and from the Memory read out.
• This memory can be part of the elevator control be.
• the measured values of the current value read from the memory and / or the emergency stop braking distance are logged according to the invention, in order for the respective elevator type to have the appropriate data available.

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• Elevator Control (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=34673122

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Country Status (2)

Cited By (5)

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• 2004
  • 2004-01-30 DE DE102004004714A patent/DE102004004714A1/de not_active Ceased
• 2005
  • 2005-01-19 EP EP05000971A patent/EP1561718A2/fr not_active Withdrawn

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