CN106315373A - Elevator landing door lock contact state detecting device and method - Google Patents

Abstract

The invention discloses a device and method for detecting the contact state of an elevator landing door lock contact, including a controller, a sensor and a voltage measuring device respectively connected to the controller, without obtaining elevator state information from the elevator control system, and without intervening in the elevator Its own control system can comprehensively and accurately understand the elevator door lock contacts and landing door status through the detection signals of sensors and elevator measuring devices, effectively preventing misjudgments or false alarms.

Description

A device and method for detecting the contact state of an elevator landing door lock

technical field

The invention relates to the field of elevators, in particular to a device and method for detecting the contact state of an elevator landing door lock contact.

Background technique

There are endless news about elevator trapping and elevator injury accidents. According to industry data, in 2015, there were 38 accidents in the elevator use link, and 20 accidents in the elevator installation, transformation, repair and maintenance links. Among the causes of accidents, there were 39 accidents caused by equipment failures such as safety accessories or protection devices, and 13 accidents caused by violations of regulations or improper operations, most of which were caused by door lock circuit failures, accounting for about 70%. In recent years, injury accidents caused by accidental or forced opening of elevator landing doors have also occurred from time to time. The landing door lock contact was artificially shorted, the aging of the electrical circuit caused the electrical safety circuit to be short-circuited to the ground, and the user did not know much about the elevator system and the elevator system did not have an effective warning system. These are the main reasons for the above accidents.

Contents of the invention

In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a detection device and method with a wide application range, which can comprehensively and accurately judge the contact state of the door lock of the elevator landing.

The technical scheme that the present invention solves its technical problem adopts is:

A kind of elevator floor door door lock contact state detection device, it is characterized in that: comprise controller and the sensor unit and the voltage measuring device that are respectively connected with controller input end,

The sensor unit is used to detect the state of the elevator car and the elevator landing door in real time and transmit the state signal to the controller;

The voltage measuring device is used to measure the voltage at both ends of the landing door lock contact in real time and transmit the voltage signal to the controller in real time;

The controller judges whether the elevator car is at the leveling position and the landing door according to the state signal of the elevator car and the landing door detected by the sensor unit and the voltage signal at both ends of the landing door lock contact measured by the voltage measuring device. Whether it is open, the landing door lock contact is shorted, the safety circuit is open, shorted to ground, or whether the landing door lock contact resistance is too large.

As a further improvement of the above solution, the sensor unit includes an infrared proximity switch and a photoelectric sensor, and the infrared proximity switch is arranged on the hoistway wall on one side of the landing door for judging whether the elevator car is at a leveling position; the photoelectric sensor Set on the door head of the landing door and facing the opening position of the landing door, it is used to judge whether the landing door is open.

As a further improvement of the above scheme, it also includes an alarm device and a digital display connected to the output end of the controller respectively, the input end of the controller is also connected with a keyboard, the alarm device includes a status indicator light and a buzzer, and the status Both the indicator light and the buzzer are installed on the door cover of the elevator landing door. A method for detecting the state of an elevator landing door lock contact. A sensor unit detects the status of an elevator car and an elevator landing door in real time and transmits the state signal to a controller; a voltage measuring device measures the voltage at both ends of the landing door lock contact in real time and The voltage signal is sent to the controller; the controller judges whether the elevator car is on the leveling floor according to the status signal of the elevator car and the elevator landing door detected by the sensor unit and the voltage signal at both ends of the landing door lock contact measured by the voltage measuring device location and whether the landing door is open, the landing door lock contact is short-circuited, the safety circuit is open, the ground is short-circuited, or the resistance of the landing door lock contact is too high, the alarm device will send out a fault prompt of the landing door lock contact.

As a further improvement of the above solution, the sensor unit includes an infrared proximity switch and a photoelectric sensor, and the infrared proximity switch is arranged on the hoistway wall on one side of the landing door for judging whether the elevator car is at a leveling position; the photoelectric sensor Set on the door head of the landing door and facing the opening position of the landing door, it is used to judge whether the landing door is open.

As a further improvement of the above solution, the control system is configured with a logic unit, which collects the state signal of the sensor unit and the voltage value at both ends of the landing door lock contact.

As a further improvement of the above solution, the method for the controller to judge that the landing door lock contact is short-circuited is as follows: the logic unit is also provided with a first threshold value b and a second threshold value of the normal voltage of the landing door lock contact c. When the logic unit judges that the elevator landing door is open, the voltage at both ends of the landing door lock contact is less than 20% of the first threshold b; when the logic unit judges that the elevator landing door is closed, the safety loop is closed, and the elevator can run normally. The door lock contacts are shorted.

As a further improvement of the above solution, the method for the controller to judge that the safety circuit is disconnected is as follows: when the logic unit judges that the elevator landing door is open, the voltage at both ends of the landing door lock contact is less than 20% of the first threshold b; The logic unit judges that when the elevator landing door is closed, there is an open circuit in the safety circuit, and the elevator reports a fault and stops.

As a further improvement of the above solution, the method for the controller to judge the short circuit to ground is as follows: when the logic unit judges that the elevator landing door is open, the voltage at both ends of the landing door lock contact is greater than 20% of the first threshold b If it is less than 50% of the first threshold value b, the situation of short circuit to ground is more complicated, and the inspectors must judge whether the safety circuit is short circuit to ground or not according to the operating conditions of the elevator.

As a further improvement of the above solution, the method for the controller to judge whether the contact resistance of the landing door lock is too large is as follows: when the logic unit judges that the elevator landing door is closed, the voltage at both ends of the landing door lock contact is greater than the first Second threshold c.

The beneficial effects of the present invention have:

The present invention is a device and method for detecting the contact state of the door lock of an elevator landing, without obtaining the information of the state of the elevator from the elevator control system, and without intervening in the control system of the elevator itself. Elevator door lock contact and landing door status, effectively preventing misjudgment or false alarm.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment, wherein:

Fig. 1 is a circuit block diagram of an embodiment of the present invention;

Fig. 2 is a schematic structural view 1 of an embodiment of the present invention;

Fig. 3 is a schematic structural diagram 2 of an embodiment of the present invention.

detailed description

With reference to Fig. 1, a kind of elevator landing door door lock contact state detecting device comprises controller 1, sensor unit 2, voltage measuring device 3, alarm device 4, digital tube display 5 and keyboard 6, and described controller 1 input terminal Connect with sensor 2, voltage measuring device 3 and keyboard, described controller 1 output terminal is connected with digital tube display 5 and warning device 4, and this detection device is powered by the elevator hall call board of every floor. The sensor unit 2 is used to detect the status of the elevator car and the elevator landing door in real time and transmits the status signal to the controller 1; the voltage measuring device 3 is used to measure the voltage at both ends of the landing door lock contact in real time and The voltage signal is transmitted to the controller 1 in real time; the controller 1, according to the status signal of the elevator car and the elevator landing door detected by the sensor unit 2 and the voltage signal at both ends of the landing door lock contact measured by the voltage measuring device 3 , to determine whether the elevator car is at the leveling position, whether the landing door is open, whether the landing door lock contact is shorted, the safety circuit is open, shorted to ground, or whether the landing door lock contact resistance is too large. The sensor unit 2 includes an infrared proximity switch 21 and a photoelectric sensor unit 22, and the infrared proximity switch 21 is arranged on the hoistway wall on one side of the landing door for judging whether the elevator car is at the leveling position;

Referring to Fig. 2 and Fig. 3, controller 1, voltage measuring device 3, digital tube display 5 and keyboard 6 form the body of the device and are installed on the landing door head, near the landing door lock contacts. The voltage measuring device 3 measures the voltage at both ends of the door lock contact of the landing door, and is used to judge whether the door lock contact is short-circuited and the working state of the door lock contact; the digital tube display 5 is used to display fault codes and set internal parameters of the controller; Keyboard 6 is used for device reset and parameter setting. The photoelectric sensor unit 22 is arranged on the door head of the landing door and facing the opening position of the landing door, and is used for judging whether the landing door is opened.

Infrared proximity switch 21 is installed on the hoistway wall on one side of the landing door, and is used to judge whether the elevator car is level. The photoelectric sensor 22 is installed on the door head of the landing door, and the sensor faces the opening position of the landing door for judging whether the landing door is opened. Alarm device 4 comprises status indicator lamp 41 and buzzer 42, and described status indicator lamp 41 and buzzer 42 are all installed on the door cover of elevator landing door, and described status indicator lamp 41 and buzzer 42 are installed on the landing door. On the door pocket, it is convenient for passengers to observe and hear the position of the alarm.

After the detection device confirms that the failure occurs, it will report to the police 42 through a status indicator light 41 and a buzzer installed on the landing door cover, and display the failure code through a digital tube display 5 . Maintenance personnel, inspectors and passengers can intuitively know the status of the landing door lock and the landing door through the status indicator light 41 and the buzzer 42 . The controller 1 will store fault information, which is convenient for maintenance personnel to check the fault records. After repairing the failure, the maintenance personnel reset the controller 1 through the keyboard 6 and eliminate the alarm.

There are various forms of elevator controllers, and the structure of the control system and the way of obtaining data from the outside are very different. Therefore, it is difficult to obtain the status data of the elevator from the elevator controller. In order to achieve the versatility of the device, the device detects the status information of the elevator through its own sensor, which greatly reduces the threshold for using the device. Under the premise of not obtaining the elevator status information from the elevator controller, relying on the voltage measuring device 3 to measure the voltage of the door lock contact of the landing door alone cannot judge whether the contact is shorted, nor can it judge whether the elevator safety circuit is open or damaged. In the same way, it is impossible to accurately judge whether the landing door is opened abnormally only by relying on the photoelectric sensor. The controller must combine the detection results of the sensors to accurately determine the fault type.

A method for detecting the state of an elevator landing door lock contact, characterized in that: a sensor detects the status of an elevator car and an elevator landing door in real time and transmits the status signal to a controller; a voltage measuring device measures the two ends of the landing door lock contact in real time and transmit the voltage signal to the controller in real time; the controller judges whether the elevator car is at the leveling position and whether the landing door is open, If the landing door lock contacts are short-circuited, the safety circuit is open, the ground is short-circuited, or the resistance of the landing door lock contacts is too high, the alarm device will send out an early warning prompt for the landing door lock contacts.

The sensor includes an infrared proximity switch and a photoelectric sensor, and the infrared proximity switch is arranged on the hoistway wall on one side of the landing door for judging whether the elevator car is at the leveling position; the photoelectric sensor is arranged on the landing door head and The door opening position towards the landing door is used to judge whether the landing door is open or not. The infrared proximity switch detects whether the car is in the leveling state. When the car is leveling, the infrared proximity switch is triggered, and the infrared proximity switch inputs a switching signal to the controller. The photoelectric sensor detects whether the landing door is open. When the landing door is opened, the light irradiates the sensor from the gap in the door. Therefore, there will be a significant difference in illuminance when the landing door is opened or closed. By detecting the light intensity at the landing door, it can be judged whether the landing door is open, and the photoelectric sensor inputs the analog value to the controller. Signal. The voltage measuring device detects the voltage at both ends of the door lock contact, and inputs an analog signal to the controller.

The control system is configured with a logic unit, which collects the state signal of the sensor and the voltage value at both ends of the landing door lock contact. Further, the method for the controller to judge that the landing door lock contact is short-circuited is as follows: the logic unit is also provided with a first threshold b and a second threshold c of the normal voltage of the landing door lock contact, and the logic unit judges When the elevator landing door is opened, the voltage at both ends of the landing door lock contact is less than 20% of the first threshold value b; when the logic unit judges that the elevator landing door is closed, the safety circuit is closed, the elevator can run normally, and the landing door lock contact is shorted. catch. In order for the detection device to identify the case where the elevator landing door contacts on the nth floor are short-circuited, there must be three necessary conditions: the first is that the elevator floor is opened; the second is that when the elevator landing door is opened, the landing door contacts are short-circuited. The voltage at both ends of the contact is less than the set threshold; the third is that when the elevator landing door is closed and the safety circuit is closed, the elevator can run normally. Therefore, the voltage measuring device must cooperate with the photoelectric sensor to accurately determine whether the landing door contact is shorted.

Further, the method for the controller to judge that the safety circuit is disconnected is as follows: when the logic unit judges that the elevator landing door is open, the voltage at both ends of the landing door lock contact is less than 20% of the first threshold b; the logic unit judges that the elevator landing door is closed , there is an open circuit in the safety circuit, and the elevator reports a fault and stops. There are three necessary conditions for the detection device to identify the open circuit of the safety circuit: the first is that the elevator floor is opened; the second is that when the elevator door is opened, the voltage at both ends of the contact is less than the set threshold due to the open circuit of the safety circuit; The third is that when the elevator landing door is closed, there is an open circuit in the safety circuit, and the elevator reports a fault and stops. Therefore, the voltage measuring device must cooperate with the photoelectric sensor to accurately determine whether the safety circuit is broken.

Further, the method for the controller to judge the short circuit to ground is as follows: the logic unit judges that when the elevator landing door is opened, the voltage at both ends of the landing door lock contact is greater than 20% of the first threshold b and less than 50% of the first threshold b %, the situation of short-circuit to ground is more complicated, and the inspectors must judge whether the safety circuit is short-circuit to ground or not according to the operating conditions of the elevator. There are two necessary conditions for the detection device to identify the short circuit of the safety circuit to the ground: the first is that the elevator landing door is opened; The terminal voltage decreases, and the voltage at both ends of the contact falls within the set range. Because the situation of the safety circuit shorted to the ground is more complicated, after the detection device judges the fault type according to the voltage measuring device and the photoelectric sensor, the detection personnel must judge whether the safety circuit is shorted to the ground according to the operating conditions of the elevator.

Further, the method for the controller to judge whether the resistance of the landing door lock contact is too large is as follows: the logic unit judges that when the elevator landing door is closed, the voltage across the landing door lock contact is greater than the second threshold c. In order for the detection device to identify the poor contact of the landing door contact or the excessive resistance, there are two necessary conditions: the first is that the elevator landing door is closed; The voltage is greater than the set threshold. Therefore, the photoelectric sensor must cooperate with the voltage measuring device to judge whether there is poor contact and excessive resistance of the landing door contact.

In order for the detection device to identify the abnormal opening of the elevator landing door on the nth floor, there are two necessary conditions: the first is that the elevator car is not leveling on the nth floor; the second is that the elevator landing door on the nth floor is opened. Therefore, the photoelectric sensor must cooperate with the infrared proximity switch to judge whether the nth floor door is opened abnormally.

Table 1 below specifically illustrates the logic unit judgment method of the controller:

surface

Note: Threshold a, b, c can be set by keyboard.

This method does not need to obtain elevator status information from the elevator control system, and does not need to intervene in the elevator's own control system. It can fully understand the elevator door lock contacts and landing door status through the detection signals of sensors and voltage measuring devices, and effectively prevent misjudgments or false alarms. . The controller will decide whether the alarm state needs to be maintained according to the type of fault. When the hidden trouble cannot be eliminated automatically, for example, the door lock contact is short-circuited, the device will continue to alarm until the maintenance personnel repair the hidden trouble; when the hidden trouble can be eliminated automatically, such as the landing door is accidentally opened, when Alarm device, when the landing door is automatically closed, the alarm will stop.

After the detection device confirms that a fault occurs, it will alarm through the status indicator light and buzzer installed on the landing door cover, and display the fault code through the digital tube display. Maintenance personnel, inspectors and passengers can intuitively know the status of landing door locks and landing doors through status indicators and buzzers. The controller will store fault information, which is convenient for maintenance personnel to check the fault records. After repairing the fault, the maintenance personnel reset the controller through the keyboard and eliminate the alarm.

The above is only a preferred embodiment of the present invention, but the present invention is not limited to the above examples, as long as it achieves the technical effect of the present invention by any same or similar means, it should belong to the protection scope of the present invention.

Claims (10)

1. An elevator landing door door lock contact state detection device, characterized in that it includes a controller (1) and a sensor unit (2) and a voltage measuring device (3) respectively connected to the input end of the controller (1), The sensor unit (2) is used to detect the state of the elevator car and the elevator landing door in real time and transmit the state signal to the controller (1); The voltage measuring device (3) is used to measure the voltage at both ends of the landing door lock contact in real time and transmit the voltage signal to the controller (1) in real time; The controller (1) judges the status signal of the elevator car and the elevator landing door detected by the sensor unit (2) and the voltage signal at both ends of the landing door door lock contact measured by the voltage measuring device (3). Whether the car is at the leveling position and whether the landing door is open, whether the contact of the landing door lock is shorted, the safety circuit is open, shorted to ground or whether the contact resistance of the landing door lock is too large. 2. The device for detecting the contact status of elevator landing door lock contacts according to claim 1, characterized in that: the sensor unit (2) includes an infrared proximity switch (21) and a photoelectric sensor (22), and the infrared The proximity switch (21) is set on the well wall on the side of the landing door to judge whether the elevator car is at the leveling position; the photoelectric sensor (22) is set on the door head of the landing door and faces the opening position of the landing door. It is used to judge whether the landing door is open. 3. A detection device for the contact status of elevator landing door lock contacts according to claim 1, characterized in that it also includes an alarm device (4) and a digital display (5) respectively connected to the output end of the controller (1) , the input terminal of the controller (1) is also connected with a keyboard (6), the alarm device (4) includes a status indicator light (41) and a buzzer (42), and the status indicator light (41) and buzzer Naming device (42) is all installed on the elevator floor door door cover. 4. A detection method for the contact state of the elevator landing door lock, characterized in that: the specific steps are as follows: the sensor unit detects the state of the elevator car and the elevator landing door in real time and sends the state signal to the controller; the voltage measuring device measures the floor in real time The voltage at both ends of the door lock contact and transmit the voltage signal to the controller; the controller detects the status signal of the elevator car and the elevator landing door based on the sensor unit and the voltage at both ends of the landing door lock contact measured by the voltage measuring device Signal, to judge whether the elevator car is at the leveling position and whether the landing door is open, the landing door lock contact is shorted, the safety circuit is open, the ground is shorted or the resistance of the landing door lock contact is too large, and the alarm device sends out Landing door lock contact failure prompt. 5. A method for detecting the contact state of an elevator landing door lock contact according to claim 4, wherein the sensor unit includes an infrared proximity switch and a photoelectric sensor, and the infrared proximity switch is set in a hoistway on one side of the landing door. On the wall, it is used to judge whether the elevator car is at the leveling position; the photoelectric sensor is arranged on the door head of the landing door and faces the opening position of the landing door, and is used to judge whether the landing door is opened. 6. A method for detecting the state of an elevator landing door lock contact according to claim 4, wherein the control system is configured with a logic unit, which collects the state signal of the sensor unit and the landing door lock contact. The voltage across the point. 7. A method for detecting the state of the elevator landing door lock contacts according to claim 6, wherein the method for the controller to judge that the landing door lock contacts are short-circuited is as follows: the logic unit also sets There are first threshold value b and second threshold value c of the normal voltage of the landing door lock contact, when the logic unit judges that the elevator landing door is open, the voltage at both ends of the landing door lock contact is less than 20% of the first threshold b; When the logic unit judges that the elevator landing door is closed, the safety circuit is closed, the elevator can run normally, and the landing door lock contacts are shorted. 8. A method for detecting the contact state of an elevator landing door lock contact according to claim 4, characterized in that: the method for the controller to judge that the safety circuit is disconnected is as follows: when the logic unit judges that the elevator landing door is open, this When the voltage across the landing door lock contact is less than 20% of the first threshold b; the logic unit judges that when the elevator landing door is closed, there is an open circuit in the safety circuit, and the elevator reports a fault and stops. 9. A method for detecting the contact state of an elevator landing door lock contact according to claim 4, characterized in that: the method for the controller to judge the short circuit to ground is as follows: when the logic unit judges that the elevator landing door is open, At this time, the voltage at both ends of the landing door lock contact is greater than 20% of the first threshold value b and less than 50% of the first threshold value b, and the situation of short circuit to ground is more complicated. Whether the circuit is shorted to ground. 10. A method for detecting the contact state of the elevator landing door lock contact according to claim 4, wherein the method for the controller to judge whether the contact resistance of the landing door lock contact is too large is as follows: the logic unit judges When the elevator landing door is closed, the voltage at both ends of the landing door lock contact is greater than the second threshold c.