Detection and alarming device of abnormal opening of hoistway door and realization method

Abstract

The invention relates to the technical field of an elevator and discloses a detection and alarming device of abnormal opening of a hoistway door, comprising a power supply, a control unit, first switches, second switches, and alarms, wherein the first switches and the second switches are arranged on all floors and the alarms are arranged on all the floors; after the first switches and the second switches of all the floors are connected in parallel, n parallel circuits are formed; a serial circuit is formed by the n parallel circuits; the control unit comprises a potential detection circuit and a high potential output circuit; and when the potential detection circuit detects that when an nth input end is a low potential, a high-potential output circuit inputs a high potential to an nth parallel circuit and supplies power to the alarm of the nth floor to enable the alarm to give an alarm. The invention further discloses a realization method of the detection and alarming device, which can effectively detect all the abnormally-opened hoistway doors and sends out an effective alarming measure, so as to effectively detect and alarm the abnormal movement hoistway door when an elevator main control board has a floor identification error.

Description

technical field [0001] The invention relates to the technical field of elevators, in particular to a detection and alarm device for abnormal opening of elevator hall doors and a realization method. Background technique [0002] As a special transportation equipment, vertically running elevators are closely related to the safety of passengers. The national standards of my country and the elevator safety regulations of various countries clearly require that the elevator car door and hall door locks be connected into the safety circuit to avoid shearing hazards. However, in recent years, there have been a large number of accidents in which people accidentally fell into the hoistway by opening the hall door, causing tragedies of personal injury to continue to occur. For this reason, there are many detection, alarm and prompting technologies for the accidental opening of hall doors in non-leveling areas in the elevator industry. [0003] For example, the Chinese patent "Detectio...

AI Technical Summary

Problems solved by technology

But it has the following problems: 1) Although the magnetic switch and the permanent magnet can operate within a certain recognition range, but only one switch is installed on each floor of the hoistway, and the installation position is fixed, for the elevator with the function of opening the door in advance, The switch of the hoistway may not be closed yet, but the hall door has been opened, resulting in a false alarm; when the elevator has the re-leveling function, the elevator hall door is opened, and the car will move due to passengers entering and leaving, and the actions of the two magnetic switches are inconsistent. The possibility is very high, so this method is not reliable in practice

2) The device cannot record the information about the abnormal opening of the hall door. When the accidental opening of the door recovers, the alarm disappears and cannot communicate with the elevator control system. Potential safety hazards may still exist, which is not conducive to maintenance personnel's troubleshooting

This method has the following disadvantages: 1) It completely depends on the elevator controller to obtain the position of the car and make judgments. When the elevator is powered off and slides, the floor in the elevator controller often does not match the actual floor. , the device has great potential safety hazards; 2) When the elevator is powered off or overhauled, the device will not be able to function, and at this time the hall door is very likely to be opened artificially, and accidents are extremely prone to occur; 3) This invention does not describe the specific alarm method after judging that the hall door is abnormally opened, but only records it inside the elevator, which cannot serve as a warning to people not to approach the hall door; 4) This invention requires at least one CPU, Floor station signal processing devices composed of serial communication controllers, etc., which will greatly increase the cost

The invention also has the following disadvantages: 1) The patent requires that hall door infrared sensors and car identification sensors be installed on each floor, which is costly and difficult to install and debug; 2) long-term use of infrared sensors shows that they are vulnerable to Visible light interference, especially the infrared sensor outside the hall door. The patent does not describe the location of the infrared sensor. If you want to identify the opening of the hall door, you will inevitably be blocked by the sensor when passengers enter and exit; the car infrared sensor is installed in the shaft to identify The position of the car is also easily covered by the dust in the hoistway, and this method is prone to misjudgment; 3) When the elevator is leveling and the door is opened in advance, the device cannot avoid the problem of inconsistent actions of the two infrared sensors, which is prone to false alarms

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