RU2116237C1 - Method to provide safe operation of lift - Google Patents

Abstract

FIELD: mechanical engineering; lifts and hoists. SUBSTANCE: method includes setting of value of parameter characterizing the movement of lift cabin, finding of actual value of this parameter, comparing actual and preset values and generation of action onto lift control system, basing on difference between preset and actual values, to switch off the lift. Time intervals corresponding to travel of cabin through fixed distances are used as parameters characterizing movement of lift cabin. EFFECT: enhanced safety of lift by reduction of time required for its switching off in emergencies. 1 dwg

Description

 The invention relates to hoisting and transport machinery and can be used, in particular, to improve the safety of elevators.

 A known method of ensuring the safety of the elevator by controlling the temperature of the motor windings, implemented in the emergency stop device of the elevator car [1]. Emergency stop occurs when the temperature of the motor windings rises.

 The disadvantage of this method is the impossibility of timely shutdown of the engine when it overheats due to the large inertia of thermal processes.

 The closest known to the claimed method for the combination of essential features is a method of ensuring the safe operation of the elevator, including setting the value of a parameter characterizing the movement of the elevator car, determining its actual value, comparing the set and measured values of this parameter and generating the impact on the elevator control system by their difference to disable the latter, implemented in the device to ensure the safety of the elevator [2]. As a parameter characterizing the movement of the cabin, the known method uses the speed of its movement.

 The disadvantage of this method is that the determination of the moment of emergency stop of the cabin is made by indirectly measuring the speed of the elevator car, namely, by counting the number of pulses for a certain period of time. This operation can only be performed in a relatively large time interval. In an emergency at modern elevator speeds of the order of 1.4 m / s during the determination of the cab speed, the counterweight has time to pull up to a destructive height and, as a result, it collapses when it falls.

 The purpose of the invention is to increase the safety of the elevator.

 The technical result of the invention is to increase the safety of the elevator due to a sharp reduction in the shutdown time of the elevator in emergency situations. This became possible due to the fact that the temporary parameters of the movement of the cab are measured directly.

 In accordance with the invention, the technical result is achieved in that in a method for ensuring the safe operation of the elevator, including setting a parameter value characterizing the movement of the elevator car, determining the actual value of this parameter, comparing it with a predetermined value of the same parameter and generating an effect on the elevator control system by their differences for its shutdown, as a parameter characterizing the movement of the cabin, use time intervals corresponding to the movement of the cabin to fixed The distance.

 The drawing shows a structural diagram of a device that implements the proposed method.

 A sensor 2 for movement signals is connected to the elevator car 1 and is connected to time generators 3 connected to the comparison unit 4 and the elevator movement control system 5, which is connected to the actuation unit 6 and the elevator car 1.

 The method is as follows.

 The sensor 2 signals of movement of the cab 1 produces signals when it passes equal sections of the path. The size of the segment is selected based on the required measurement accuracy. The signals of the sensor 2 stop the countdown carried out by various reference time generators 3, which are started when the movement of the elevator is turned on. Different generators are necessary due to the fact that the movement of the cabin 1 can occur at different speeds. For each type of elevator and for a specific speed of its movement, the maximum time intervals for the passage of selected segments of the path are determined by calculation. The size of the intervals is set by adjusting the generators 3. When comparing the set and measured duration of the time intervals, a situation is revealed when the measured time interval is longer than the set, the elevator is turned off through its control system 5. If this situation is not determined, then the signals of sensor 2, by terminating timing for the measured interval, allow a new timing of the generators 3 for the next leg.

The proposed method allows to implement devices with the following qualities:
1. The number of measured time intervals per unit of real time can be made arbitrarily large, thereby increasing the accuracy of measuring the real time parameters of the movement of the cabin.

 2. To make a decision about the presence of an emergency, only one time interval is sufficient, and this analysis is carried out throughout the entire time the cab moves in each time interval.

 3. Increased safety of the elevator is achieved by drastically reducing the time it is turned off in an emergency while improving the accuracy of measurement of controlled parameters.

Literature:
1. Copyright certificate N 998278, cl. B 66 B 5/02, 1981.

 2. Patent of the Russian Federation N 2000270, cl. B 66 B 5/02, 1991.

Claims (1)

 A way to ensure the safety of the elevator, including setting the value of the parameter characterizing the movement of the elevator car, determining the actual value of this parameter, comparing it with the given value of the same parameter and generating the effect on the elevator control system by their difference to turn it off, characterized in that as parameter characterizing the movement of the cabin, use time intervals corresponding to the movement of the cabin at a fixed distance.