Elevator – industrial lift truck – or stationary lift for vehicle – With monitoring – signalling – and indicating means – Monitors operational parameter
Patent
1991-08-01
1996-11-26
Nappi, Robert
Elevator, industrial lift truck, or stationary lift for vehicle
With monitoring, signalling, and indicating means
Monitors operational parameter
187391, 187287, 187390, B66B 502
Patent
active
055788017
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for sensing physical characteristics, in particular motion parameters, of a freight and/or load elevator, with the elevator comprising at least one cable assembly which is guided over a driving pulley and whose one end has suspended therefrom the elevator car and whose other end a counterweight, and said elevator being driven by a drive motor which is controlled by an electric control circuit and acts on the driving pulley, and including a braking device which is connected to the driving pulley and controlled by the control circuit.
Safety tests which are performed with freight and passenger elevators form the background of the present invention. Elevators of this type must be controlled at regular intervals, and characteristics such as paths of travel, braking paths, catch paths and non-slippage (drive capability) of the cable assembly, which is driven by the driving pulley, have to be determined.
The checking of elevators has so far involved a lot of work because the testing of the function of the brake and the catch device required the loading of the elevator with the admissible useful load or even with 1.5 times the useful load when the non-slippage property was checked. The loading and unloading operations in connection with the necessary weights are not only time-consuming, but also call for great physical efforts. Moreover, the weight test for the elevator system greatly stresses the loaded components.
U.S. Pat. No. 3,781,901 discloses an apparatus for displaying and storing an elevator movement. The rotation of the driving pulley of the elevator is sensed by a sensor and plotted on a time-path diagram for observing the elevator movement. The elevator movement is thereby to be optimized if necessary. DE-A-3822488 discloses a method for controlling position and movement of a cable-moved transportation means so as to determine cable slippage and stretching properties of the carrying cables during operation. The signals that are evaluated for determining the position are directly obtained in an optoelectronic way from the existing form of the cabled elements moving the transportation means.
In the two above-mentioned documents the checking of elevators is not at all possible or can only be carried out under great efforts.
It is the object of the present invention to provide means which are used for checking freight/and or passenger elevators and with the aid of which the amount of work spent on the test method is considerably reduced while the test quality is increased at the same time.
In accordance with the invention, this object is attained in that there is provided an evaluation unit with a timer, as well as a position pick-up which communicates with the cable assembly and/or the driving pulley and is connected to an input of the evaluation unit, and in that the evaluation unit comprises other inputs which are connectable to switching points of the control unit at which signals are present for controlling the sequence of motions of the elevator.
Kinematic elevator data, i.e. travel path values and the associated time measurement values, can be determined with such an apparatus in response to the signals that control the sequence of motions of the elevator, and the necessary test characteristics can be found on the basis of the kinematic data. As far as safety aspects are concerned, the test method of the invention is a considerably improvement as there are no heavy loads acting on the elevator during testing.
In particular, the evaluation unit advantaeously includes a means for determining and recording distance, speed and acceleration values as a function of time and path. The recorded braking and catch curves are displayed on a screen or printed out by a printer and superimposed with calculated envelopes (which set admissible upper and lower limits). The effectiveness of the brake and the catch device can thus be determined in an easy way. The determined curves may be stored on a data carrier. The evaluation means expediently comprises a computer, preferably
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Nappi Robert
Technischer Uberwachungs-Verein Bayern e.V.
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