RU2021194C1 - Device for opening lift shaft doors in emergency - Google Patents

Abstract

FIELD: electrical engineering. SUBSTANCE: device has rectifier 1, standby supply source 2, converter 3, starting and switching over unit 5, relay 11 to connect emergency stop system, set of contacts 3 which cut in voltage monitoring relay 12, two make contacts 6, 4 and three break contacts 7, 8, 10. EFFECT: enhanced reliability. 1 dwg

Description

 The invention relates to lifting and handling equipment and can be used mainly in elevator construction for opening automatic locks of sliding doors of the elevator shaft in emergency situations.

 A device is known for emergency opening of doors of an elevator shaft, comprising a cylindrical body mounted inside the housing coaxially with the last rotary roller, a radially arranged leash, a spring and a key with a cylindrical head are fixed to its protruding end to insert an annular cavity between the body and the outer surface of the roller.

 The known device does not fully ensure the safety of using the elevator, since the opening of the doors of the elevator shaft in an emergency is carried out by maintenance personnel located outside the elevator car.

 It is also known a device for emergency opening of doors of an elevator shaft, having a two-arm lever with a roller mounted on an axis fixed to the carriage, a finger is provided on one of the lever arms, which, when the lever is rotated, acts on the movable latch of the automatic lock secured to the elevator beam and divides it with a fixed emphasis fixed on the carriage. The two-shouldered lever is rotated by means of a leash mounted on a roller, which in turn is rotated with a special key. The roller with a leash is mounted on the door leaf of the shaft.

 However, this device also does not ensure the safety of using the elevator, because opening the doors of the elevator shaft in an emergency, for example, power outage in case of fire, earthquake, is also carried out by service personnel located outside the elevator car, which may not be in place in an emergency, as well as the need determine which floor you need to open the door entails a loss of time with the ensuing consequences.

 The most complete question is whether it is possible to leave the elevator car in a timely manner in an emergency without outside help, for example, in case of fire, the device adopted as a prototype has a backup power supply, which is a 12-volt car battery, a rectifier, a voltage converter, and ballasts.

 However, this device has several disadvantages that reduce its reliability and reliability. Car batteries are subject to self-discharge, evaporation of the electrolyte, which significantly reduces their electrical capabilities. Rechargeable batteries require scarce material for their manufacture, have a relatively short service life and high weight. All this taken together reduces the reliability and uptime of the device.

 The purpose of the invention is to improve the operational characteristics of the elevator by making it possible to open the doors of the elevator shaft when the power is off.

 This goal is achieved by the fact that the device has a capacitor bank as a backup power source, a contact block including a voltage control relay with two short circuits and three NC contacts, a relay for connecting the emergency cab stop electrical system and opening the doors of the elevator shaft. The capacitor bank is connected through the first make contact to the rectifier, and through the first make contact to the voltage converter. The voltage converter with one output is connected to the relay for connecting the emergency cab stop electrical system, which, in turn, is connected to the start-switch block via the third opening contact, and the voltage converter, through the second opening contact, is also connected to the start-switch block. The contact block is controlled by a relay permanently connected to the rectifier.

 The use of a capacitor bank, a contact block as a backup power source, which automatically includes an electrical circuit for emergency stopping the cab and opening the doors of the elevator shaft when the voltage disappears from an external power source, as well as the simplicity of the device and maintenance, significantly improve the operational characteristics of the elevator and significantly distinguishes the claimed device from the prototype.

 The drawing shows a schematic electrical block diagram of the device.

 The device for emergency opening of doors of the elevator shaft includes a rectifier 1, a capacitor bank 2, a terminal block 3, a control voltage monitoring relay having two NO contacts 4 and 5 and three NO contacts 6, 7 and 8. A capacitor bank 2 is connected through the first NO contact 4 to the rectifier 1, and through the first NC contact 6 to the voltage converter 9, one output of which through the second NC contact 7 is connected to the starting-switching unit 10, which is connected through the second NO contact 5 to the external Power supply. The second output of the voltage converter 9 is connected to the emergency stop relay 11, which, in turn, is connected through the third normally open contact 8 to the control panel 10. Contact block 3 is controlled by relay 12, which is constantly connected to rectifier 1.

 The device operates as follows.

 In the initial position, the voltage from the external power source is supplied to the rectifier 1 and the rectified voltage is supplied from it to the relay 12, as a result, contacts 4 and 5 are held in a closed state, and contacts 6, 7 and 8 are in an open state. Through closed contact 4, voltage is supplied to PPB 10 and from it to all electrical systems in the electrical equipment of the elevator, and through closed contact 5, voltage from rectifier 1 is supplied to capacitor bank 2. The elevator is ready for operation.

 To use the elevator, you need to use the "Call" button located outside the elevator shaft doors on the landing, to call the elevator car, for example, to the first floor. When the cab reaches the first floor, it stops, the door opens and the passenger enters the cab. Next, the passenger presses the order button, for example the seventh floor, and the cabin closes and moves to a given floor. During the movement of the cabin, if the passenger needs to leave earlier, for example, on the sixth floor, then the passenger, when the cabin passes the fourth floor, presses the "Stop" button. In this case, the cabin reaches the nearest floor in the direction of travel, in our case, to the fifth floor, and stops, the doors open and the passenger leaves the cabin.

 When the voltage disappears in the external network, relay 12 is activated, as a result, contacts 4 and 5 open and disconnect the external power source from the PPB 10 and from the capacitor bank 2, and contacts 6, 7 and 8 are closed and connect the capacitor bank 2 to all electric systems of the elevator through the converter voltage 9. The voltage from the converter 9 is supplied to the emergency stop relay 11, which includes an emergency stop circuit, which is equivalent to pressing the "Stop" button. When the cab reaches the nearest floor in the direction of travel, it stops, the elevator shaft door opens and the passenger leaves the cab. When voltage appears in the external network, the relay 12 is activated and connects all the electrical systems of the elevator to an external power source and a capacitor bank 2 to the rectifier.

 The use of a capacitor bank ensures that the doors of the elevator shaft are opened when the external source is switched off, since it is constantly charging and does not need daily monitoring.

 Since non-scarce materials are used to manufacture capacitors, the cost of the device is reduced, and the absence of an electrolyte greatly simplifies maintenance.

Claims (1)

 DEVICE FOR EMERGENCY OPENING OF ELEVATOR SHAFT DOORS, including a backup power supply, a converter, a starting-switching unit, a rectifier connected to an external power source, characterized in that, in order to improve the operational characteristics of the elevator by providing the possibility of opening the doors of the elevator shaft during de-energization, it equipped with a contact block including a voltage monitoring relay with two make and three make contacts, an emergency stop electrical connection relay, and a backup the power source is made in the form of a capacitor battery, while the capacitor battery is connected through the first make contact to the rectifier and through the first make contact to the voltage converter, the output of which is connected through the second make contact with the start-switch unit and through the second make contact with an external source power supply, the voltage converter is also connected via series-connected relays for connecting the emergency stop electrical system and the third opening contact to the start-up eklyuchayuschemu unit.