An elevator door lock contact resistance detection and voltage monitoring system and method thereof

Abstract

The application discloses an elevator door lock contact resistance detection and voltage monitoring system and a method thereof, which comprises a door lock contact resistance detection circuit arranged behind a safety circuit; the door lock contact resistance detection circuit comprises a constant current source, a plurality of detection points, a plurality of contact switches and a processing unit in series connection; the processing unit is connected with a monitoring platform through the Internet of Things; the detection points comprise a car door lock detection point, a hall door lock and voltage detection point and an auxiliary detection point; the contact switches comprise a first switch, a second switch, a third switch and a fourth switch. The principle that a direct current constant current source generates a direct current voltage drop through a resistor and data processing technology are directly applied to an elevator system, so that the detection of the car door lock and the hall door lock resistance is simply and effectively realized. The voltage value detection technology is used to monitor the voltage value in front of a contactor, and a warning can be given. The application has the advantages that the door lock resistance and the voltage value in front of the contactor can be monitored in real time, targeted maintenance is needed, and layer-by-layer checking is not needed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of elevator technology, in particular to an elevator door lock contact resistance detection and voltage monitoring system and method thereof. BACKGROUND

[0002] With the rapid development of urban modernization, elevators, as a vertical transportation tool, have been widely used in people's work and life, and play an important role in transporting passengers and goods. The elevator car door and the landing door play a safety protection role, and the door lock contact is used to determine whether the elevator door is closed. As to whether the door lock contact is closed, a special detection point is set to detect the car door and the landing door respectively. If the door lock contact is not closed, the elevator cannot operate normally.

[0003] GB / T 7588.1-2020 "Safety Code for the Construction and Installation of Elevators Part 1: Passenger and Freight Elevators" requires that when the car is in the unlocking area, the car door is opened and the landing door lock is released, the electrical safety device for checking the closing position of the car door, the electrical safety device for checking the locking position of the landing door locking device and the correct action of the monitoring signal should be monitored. If the failure of the above-mentioned device is monitored, the normal operation of the elevator should be prevented.

[0004] Currently, door lock detection mainly aims at the closing condition of the car door lock contact and the landing door lock contact. The closing of the door lock contact will output a detection signal to the elevator control system (hereinafter referred to as "system"), and the safety circuit and the car door lock hall door lock circuit must be connected to attract the contactor, so that the elevator can operate normally. If the door lock contact is not connected, the contactor will not be attracted, and the system state can be checked to check whether the detection signal is normal.

[0005] However, the door lock contact will have a small electric arc phenomenon every time it is disconnected. Over time, the surface of the contact will be charred, and the resistance of the contact will increase. Or the door lock contact is covered with dust and other fine foreign matter, and the resistance of the contact will also increase. These conditions will cause the voltage drop in the circuit passing through the door lock contact to increase, and when the voltage drops to a certain value, the contactor will not be normally attracted, but the door lock contact is still in a normal closed state.

[0006] The current elevator control system cannot detect the above special state, and will not give a fault prompt. This results in the need to arrange maintenance personnel to carry out special inspection on site to find out the problem, and sometimes it is difficult for maintenance personnel to find the real reason why the contactor cannot be attracted, which prolongs the maintenance time and affects the use of the elevator.

[0007] Moreover, the current door lock needs to be regularly maintained by maintenance personnel on site to check whether it is in normal condition, especially for high-rise buildings with many floors, which is quite time-consuming and laborious for maintenance personnel to check comprehensively.

[0008] Therefore, the existing elevator door lock fault detection technology cannot detect the special state of large pressure drop but normal contact closure, and the artificial one-by-one floor investigation is time-consuming and labor-intensive. SUMMARY

[0009] The application aims to provide an elevator door lock contact resistance detection and voltage monitoring system and method.

[0010] The technical solution of the application is an elevator door lock contact resistance detection and voltage monitoring system, which comprises a door lock contact resistance detection circuit arranged in a safety circuit of an elevator control system; the safety circuit is connected in series with a car door lock, a hall door lock and a contactor in sequence; the door lock contact resistance detection circuit comprises a constant current source, a plurality of detection points, a plurality of contact switches and a processing unit connected in series; the processing unit is connected to a monitoring platform through the Internet of Things; the detection points comprise a car door lock detection point, a hall door lock and voltage detection point, an auxiliary detection point and a voltage monitoring detection point; the contact switches comprise a first switch, a second switch, a third switch and a fourth switch.

[0011] When the car door lock is detected, one end of the constant current source is connected to one end of the processing unit through a first contact of the first switch, a car door lock detection point and a first contact of the second switch, and the other end of the constant current source is connected to the other end of the processing unit through a first contact of the third switch, an auxiliary detection point and a first contact of the fourth switch.

[0012] When the hall door lock is detected, the contact switches are connected to the second contact.

[0013] The auxiliary detection point is connected to the second contact of the first switch, the second contact of the second switch, the first contact of the third switch and the first contact of the fourth switch.

[0014] The processing unit has a voltage acquisition module, a data processing and calculation module and a data sending module; the voltage acquisition module is used to acquire the voltage drop of the car door lock and the hall door lock; the data processing and calculation module is used to calculate the resistance of the door lock contact; and the data sending module is used to send the calculated resistance and the floor where the resistance is detected to the monitoring platform for monitoring.

[0015] The aforementioned elevator door lock contact resistance detection and voltage monitoring system, the monitoring platform has a monitoring warning module, which can compare the received contactor voltage value with the set threshold value to determine whether a warning reminder is needed, and can accurately locate the floor of the abnormal hall door lock contact through resistance deviation recording; the contactor front-end voltage value can be calculated by pressure drop or directly collected in the circuit.

[0016] An elevator door lock contact resistance detection and voltage monitoring method, comprising the following processes:

[0017] A, judge the elevator running state: if in the starting running state, the system executes step E; if in the stop door to the position state, execute step B;

[0018] B, judge the running time of the elevator: if the running time has reached the preset value and the elevator is in standby state, execute step C; otherwise, execute step D; the preset value is set in the system, such as 24 hours once, in the period of less passenger flow at night;

[0019] C, execute door lock resistance detection: the resistance value of the car door lock and the hall door lock is detected by using the principle of constant current source generating DC voltage drop, and transmitted to the monitoring platform through the Internet of Things;

[0020] D, execute hall door lock resistance detection: after the elevator stops running and the door is closed to the position, the resistance value of the hall door lock is detected by using the principle of constant current source generating DC voltage drop, and the floor where the resistance detection is performed is transmitted to the monitoring platform through the Internet of Things;

[0021] E, execute voltage detection: the contactor front-end voltage value is transmitted to the monitoring platform through the Internet of Things, compared with the set threshold value, and whether a warning is needed is judged; if needed, a warning is issued, and whether the problem is the car door lock or the hall door lock is judged according to the measured door lock resistance value, and maintenance is performed; the door lock resistance detection has been performed before the elevator runs.

[0022] The aforementioned elevator door lock contact resistance detection and voltage monitoring method, the specific content of step C is as follows:

[0023] When the elevator is in standby state, the resistance value of the car door lock is detected, all contact switches are connected to the first contact, a constant current source is output, the current has a voltage drop when passing through the door lock, and the processing unit calculates the resistance value of the car door lock according to the voltage drop and sends it to the monitoring platform for storage and monitoring;

[0024] The resistance value of the hall door lock is detected, all contact switches are connected to the second contact, a constant current source is output, the current has a voltage drop when passing through the door lock, and the processing unit calculates the resistance value of the hall door lock according to the voltage drop and sends it to the monitoring platform for storage and monitoring.

[0025] The elevator door lock contact resistance detection and voltage monitoring method, the step D described the execution hall door lock resistance active detection, only the resistance of the hall door lock is detected, the specific content is as follows:

[0026] All contact switches are connected to the second contact, output constant current source, the current has a voltage drop when passing through the door lock, the processing unit calculates the resistance of the hall door lock according to the voltage drop; The monitoring platform compares the resistance value, records the resistance deviation, and arranges the floors with larger data deviation in order to accurately locate the abnormal floor of the hall door lock.

[0027] The elevator door lock contact resistance detection and voltage monitoring method, the step E described the execution voltage detection, judges whether to need warning, the specific content is as follows:

[0028] The elevator control system monitors the voltage value in front of the contactor and compares it with the set threshold value in real time, the threshold value is 85% Ue, Ue is the rated operating voltage of the contactor coil; If the voltage value in front of the contactor reaches the threshold value, the monitoring platform will give a warning, and then judge the problem point through the door lock resistance to maintain and maintain.

[0029] The elevator door lock contact resistance detection and voltage monitoring method, the monitoring platform stores, compares and records the resistance deviation of each detection result, and arranges the floors with larger data deviation in order; The monitoring platform compares the received voltage value with the set threshold value to determine whether to need to give a warning.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] 1. The principle of DC voltage drop generated by DC constant current source through resistance and data processing technology are directly applied to elevator system, and the detection of car door lock and hall door lock resistance is realized simply and effectively.

[0032] 2. The voltage value detection technology is used to monitor the voltage value in front of the contactor, the threshold value is set in the system according to the actual situation, the monitoring result is compared with the threshold value, and the warning is given when the threshold value is reached or exceeded, which plays a warning role.

[0033] 3. The detected door lock resistance and monitored voltage value are transmitted to the corresponding monitoring platform through the Internet of Things, which can monitor the car door lock, hall door lock resistance and contactor front voltage value in real time, only the corresponding maintenance work is needed after the detection result is abnormal, the on-demand maintenance is realized, and the periodic repeated inspection work is saved.

[0034] 4. The door lock resistance value of each door is detected, and the abnormal door lock contact resistance value of each floor can be accurately positioned through the resistance value change and the current floor. For the case of high-rise and more door locks, the floor of the door lock contact resistance value can be accurately positioned by the detection method, and the maintenance personnel only need to maintain the door lock, without checking each floor, saving time and effort.

[0035] Therefore, the present application has the advantages of real-time and effective monitoring of door lock resistance value and contactor front end voltage value, convenient maintenance, and time-saving maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The door lock contact detection circuit diagram of the detection system of the present application.

[0037] The description of the drawings is as follows: 1-constant current source, 2-processing unit, 31-elevator door lock detection point, 32-hall door lock and voltage detection point, 33-assistant detection point, 34-first switch, 35-second switch, 36-third switch, 37-fourth switch, 4-IoT, 5-monitoring platform, 6-system safety circuit, 7-elevator door lock, 8-hall door lock, 9-contactor. DETAILED DESCRIPTION

[0038] The present application will be further described below in conjunction with the drawings and examples, but it is not as the basis for limiting the present application.

[0039] Example. An elevator door lock contact resistance value detection and voltage monitoring system, as shown in Figure 1 , comprising a door lock contact resistance value detection circuit arranged after the safety circuit 6 of the elevator control system, and the safety circuit 6 is connected in series with the elevator door lock 7, the hall door lock 8 (for multiple floors, it is a general term of multiple hall door locks connected in series) and the contactor 9; the door lock contact resistance value detection circuit comprises a constant current source 1, multiple detection points, multiple contact switches and a processing unit 2 connected in series; the processing unit 2 is connected with the monitoring platform 5 through the Internet of Things 4; the detection points include the elevator door lock detection point 31, the hall door lock and voltage detection point 32 and the auxiliary detection point 33; the contact switches include the first switch 34, the second switch 35, the third switch 36 and the fourth switch 37.

[0040] The constant current source 1 can be a common DC constant current source on the market.

[0041] When the elevator door lock 7 is detected, one end of the constant current source 1 is connected with one end of the processing unit 2 through the first contact of the first switch 34, the elevator door lock detection point 31 and the first contact of the second switch 35, and the other end of the constant current source 1 is connected with the other end of the processing unit 2 through the first contact of the third switch 36, the auxiliary detection point 33 and the first contact of the fourth switch 37;

[0042] When the hall door lock 8 is detected, one end of the constant current source 1 is connected with one end of the processing unit 2 through the second contact of the first switch 34, the auxiliary detection point 33 and the second contact of the second switch 35, and the other end of the constant current source 1 is connected with the other end of the processing unit 2 through the second contact of the third switch 36, the hall door lock and the voltage detection point 32 and the second contact of the fourth switch 37.

[0043] The auxiliary detection point 33 is connected with the second contact of the first switch 34, the second contact of the second switch 35, the first contact of the third switch 36 and the first contact of the fourth switch 37 respectively.

[0044] The processing unit 2 has a voltage acquisition module, a data processing and calculation module and a data sending module; the voltage acquisition module is used for acquiring the voltage drop of the car door lock and the hall door lock, and the data processing and calculation module is used for calculating the resistance value of the door lock contact; the data sending module is used for sending the calculated resistance value and the floor where the resistance value is detected to the monitoring platform 5 for monitoring.

[0045] The monitoring platform 5 has a monitoring and early warning module, which can compare the received contactor 9 front end voltage value with the set threshold value to judge whether to issue a warning reminder, and can accurately locate the floor where the hall door lock contact is abnormal through the resistance value deviation record; the contactor 9 front end voltage value can be calculated by voltage drop or directly collected in the circuit.

[0046] An elevator door lock contact resistance value detection and voltage monitoring method, comprising the following processes:

[0047] A, judge the elevator running state: if it is in the starting running state, the system executes step E; if it is in the stop door to place state, step B is executed;

[0048] B, judge the running time of the elevator: if the running time has reached the preset value, and the elevator is in standby state, step C is executed; otherwise, step D is executed; the preset value is set in the system, such as detecting once every 24 hours, and setting in the period of less passenger flow at night;

[0049] C, execute the door lock resistance value detection: the resistance value of the car door lock 7 and the hall door lock 8 is detected by using the principle of constant current source 1 generating direct current voltage drop, and transmitted to the monitoring platform 5 through the Internet of Things 4;

[0050] D, execute the hall door lock resistance value active detection: after the elevator running ends and stops the door to place, the resistance value of the hall door lock 8 is detected by using the principle of constant current, 1 generating direct current voltage drop, and the floor where the resistance value is detected is transmitted to the monitoring platform 5 through the Internet of Things 4;

[0051] E, execute voltage detection, the contactor 9 front end voltage value is transmitted to the monitoring platform 5 through the internet of things 4, compared with the set threshold, judge whether need warning, if need, send warning, again according to the measured door lock resistance value judge is the problem of car door lock or hall door lock, and maintenance; Door lock resistance value detection has been carried out before elevator operation.

[0052] The specific content of the routine detection of the door lock resistance value in step C is as follows:

[0053] When the elevator is in standby state, the resistance value of the car door lock 7 is detected, all contact switches are connected to the first contact, the constant current source 1 is output, the current has a voltage drop when passing through the door lock, and the processing unit 2 calculates the resistance value of the car door lock 7 according to the voltage drop and sends it to the monitoring platform 5 for storage and monitoring.

[0054] The resistance value of the hall door lock 8 is detected, all contact switches are connected to the second contact, the constant current source 1 is output, the current has a voltage drop when passing through the door lock, and the processing unit 2 calculates the resistance value of the hall door lock 8 according to the voltage drop and sends it to the monitoring platform 5 for storage and monitoring.

[0055] The specific content of the active detection of the hall door lock resistance value in step D is as follows:

[0056] Only the resistance value of the hall door lock 8 is detected, all contact switches are connected to the second contact, the constant current source 1 is output, the current has a voltage drop when passing through the door lock, and the processing unit 2 calculates the resistance value of the hall door lock 8 according to the voltage drop;

[0057] If the resistance value of the hall door lock 8 of a certain floor changes greatly due to some reason (such as dust entering), then through the comparison of the resistance values, the monitoring platform 5 records the deviation of the resistance values, and arranges the floors with larger data deviation in order, so that the abnormal hall door lock 8 of which floor can be accurately located.

[0058] The specific content of the voltage detection in step E is as follows:

[0059] The elevator control system monitors the contactor 9 front end voltage value and compares it with the set threshold, and the set threshold is generally 85% Ue (Ue is the rated operating voltage of the contactor coil, and 85% Ue is the lower limit of the voltage range required for the contactor to be attracted);

[0060] When the number of floors is small, the threshold can also be set larger (> 85% Ue) to prevent the door lock contact from being seriously blackened or seriously sooted;

[0061] If the contactor 9 front end voltage value reaches the threshold, the monitoring platform 5 will give a warning, and then determine the problem point through the door lock resistance value and carry out maintenance.

[0062] The monitoring platform 5 stores, compares and records the resistance deviation of each detection result, arranges several floors with larger data deviation in order, and when the voltage value at the front end of the contactor 9 reaches the set threshold, the maintenance personnel can perform maintenance on the corresponding floor according to the prompt without layer-by-layer troubleshooting. The maintenance personnel can conveniently perform targeted maintenance, save the tedious troubleshooting time, and avoid the problem of difficult troubleshooting when the contactor cannot be attracted.

Claims

1. An elevator door lock contact resistance detection and voltage monitoring system comprising a door lock contact resistance detection circuit provided after a safety circuit (6) of an elevator control system, the safety circuit (6) being followed in series by a car door lock (7), a landing door lock (8) and a contactor (9), characterized in that: The door lock contact resistance detection circuit comprises a constant current source (1), a plurality of detection points, a plurality of contact switches and a processing unit (2) connected in series; the processing unit (2) is connected with a monitoring platform (5) through an Internet of Things (4); the detection points comprise a car door lock detection point (31), a hall door lock and voltage detection point (32) and an auxiliary detection point (33); the contact switches comprise a first switch (34), a second switch (35), a third switch (36) and a fourth switch (37); When the car door lock (7) is detected, one end of the constant current source (1) is connected with one end of the processing unit (2) through a first contact of the first switch (34), the car door lock detection point (31) and a first contact of the second switch (35), and the other end of the constant current source (1) is connected with the other end of the processing unit (2) through a first contact of the third switch (36), the auxiliary detection point (33) and a first contact of the fourth switch (37); When the hall door lock (8) is detected, the contact switches are connected with the second contacts; The auxiliary detection point (33) is connected with a second contact of the first switch (34), a second contact of the second switch (35), a first contact of the third switch (36) and a first contact of the fourth switch (37) respectively; The elevator door lock contact resistance detection and voltage monitoring system performs active detection of the hall door lock resistance value, after the elevator stops running and the door is closed to the position, the principle of the constant current source (1) passing through the hall door lock (8) to generate a direct current voltage drop is used to detect the resistance value of the hall door lock (8), and the floor at the time of the resistance value detection is obtained, which is transmitted to the monitoring platform (5) through the Internet of Things (4).

2. The elevator door lock contact resistance detection and voltage monitoring system according to claim 1, characterized in that: The processing unit (2) comprises at least a voltage acquisition module, a data processing and calculation module and a data sending module; the voltage acquisition module is used to acquire the voltage drop of the car door lock and the hall door lock; The data processing and calculation module is used to calculate the resistance value of the door lock contact; the data sending module is used to send the calculated resistance value and the floor at the time of the resistance value detection to the monitoring platform (5) for monitoring.

3. The elevator door lock contact resistance detection and voltage monitoring system of claim 1, wherein: The monitoring platform (5) has a monitoring and early warning module, which can compare the received contactor (9) front end voltage value with the set threshold value to determine whether a warning needs to be sent, and can accurately locate the floor of the hall door lock contact abnormality through the resistance value deviation record.

4. The elevator door lock contact resistance detection and voltage monitoring method applied to the elevator door lock contact resistance detection and voltage monitoring system according to any one of claims 1-3, characterized in that, The method comprises the following steps: A, judging the running state of the elevator: if it is in the starting running state, step E is executed; if it is in the stop running and door closing to the position state, step B is executed; B, judging the running time of the elevator: if the running time has reached the preset value and the elevator is in the standby state, step C is executed; otherwise, step D is executed; C, performing regular detection of the door lock resistance value: the principle of the constant current source (1) passing through the resistance to generate a direct current voltage drop is used to detect the resistance value of the car door lock (7) and the hall door lock (8), which is transmitted to the monitoring platform (5) through the Internet of Things (4); D, performing active detection of the hall door lock resistance value: after the elevator stops running and the door is closed to the position, the principle of the constant current source passing through the hall door lock (8) to generate a direct current voltage drop is used to detect the resistance value of the hall door lock (8), and the floor at the time of the resistance value detection is obtained, which is transmitted to the monitoring platform (5) through the Internet of Things (4); E, execute voltage detection, the contactor (9) front end voltage value is transmitted to the monitoring platform (5) through the Internet of things (4), compared with the set threshold, judge whether need warning; If need, send out warning, then according to the measured door lock resistance value to determine whether the car door lock or the hall door lock problem, and maintenance.

5. The method of claim 4, wherein the method further comprises: The specific content of step C is as follows: Detect the resistance value of the car door lock (7), all contact switches are connected to the first contact, output constant current source (1), the current has a voltage drop when passing through the door lock, the processing unit (2) calculates the resistance value of the car door lock (7) according to the voltage drop and sends it to the monitoring platform (5) for storage monitoring; Detect the resistance value of the hall door lock (8), all contact switches are connected to the second contact, output constant current source (1), the current has a voltage drop when passing through the door lock, the processing unit (2) calculates the resistance value of the hall door lock (8) according to the voltage drop and sends it to the monitoring platform (5) for storage monitoring.

6. The method of detecting resistance value of an elevator door lock contact and monitoring voltage according to claim 4, characterized in that, The specific content of step D is as follows: All contact switches are connected to the second contact, output constant current source (1), the current has a voltage drop when passing through the door lock, the processing unit (2) calculates the resistance value of the hall door lock (8); The monitoring platform (5) compares the resistance value and records the resistance deviation, accurately locates the abnormal floor of the hall door lock.

7. The method of detecting resistance value of an elevator door lock contact and monitoring voltage according to claim 4, characterized in that, The specific content of step E is as follows: The elevator control system monitors the contactor (9) front end voltage value and compares it with the set threshold in real time, the threshold is 85%Ue, Ue is the rated working voltage of the contactor coil; If the contactor (9) front end voltage value reaches the threshold, the monitoring platform (5) will give an alarm, and then determine the problem point through the door lock resistance value and carry out maintenance.

8. The elevator door lock contact resistance detection and voltage monitoring system of claim 4, wherein: The monitoring platform (5) stores, compares and records the resistance deviation of each detection result; The monitoring platform (5) compares the received voltage value with the set threshold to determine whether to send an alarm.

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