An elevator safety door lock circuit detection system

Abstract

This utility model discloses an elevator safety door lock circuit detection system. By connecting a distributed voltage detection module in parallel across each independent switch in the safety circuit and door lock circuit, it achieves real-time, synchronous, and accurate measurement of the voltage drop across all switch nodes. It calculates the real-time equivalent resistance value of each switch and compares it with multi-level alarm thresholds, enabling precise diagnosis of potential faults such as poor contact and increased resistance. This provides early warning and accurate judgment of switch status. The alarm indication unit can immediately locate and display the specific faulty switch and fault type, allowing maintenance personnel to intuitively and quickly identify the problem, greatly shortening troubleshooting and repair time and reducing the reliance on the experience of personnel.

Description

Technical Field

[0001] This utility model relates to the field of elevator testing system technology, and in particular to an elevator safety door lock circuit testing system. Background Technology

[0002] In the elevator and escalator industry, safety protection mechanisms are one of the core elements ensuring the reliability of equipment operation. Currently, safety designs for escalators and moving walkways generally integrate devices for detecting safety circuit switch nodes. These devices can provide basic responses to critical safety signals, but their function is mainly focused on judging the overall on / off state, lacking the ability to conduct refined analysis of the working state of individual nodes. For widely used traction elevators, although the industry has established a comprehensive monitoring system for safety circuits and door lock circuits, existing solutions mostly use series voltage sampling or simple current detection to achieve global anomaly alarms, failing to delve into the level of each individual switch node for targeted monitoring. This extensive detection mode has significant drawbacks: when potential faults such as poor contact or contact oxidation occur in the safety circuit or door lock circuit, only vague, comprehensive anomaly information can be fed back, unable to clearly indicate the specific faulty section or corresponding switch element.

[0003] This technological bottleneck directly leads to difficulties in actual operation and maintenance scenarios. Faced with complex electrical circuits, on-site maintenance personnel must rely on experience to systematically check dozens or even hundreds of connectors and switch contacts, significantly extending fault location time and negatively impacting the company's emergency response capabilities and service efficiency. This is especially true in modern urban environments with dense high-rise buildings, where the social impact of elevator outages is even more pronounced. Furthermore, due to the lack of intuitive node-level diagnostic data, grassroots maintenance operations heavily rely on the personal experience and professional skills of technicians, increasing the risk of misjudgment and raising the industry's entry barriers. Clearly, existing technology still needs improvement and enhancement. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an elevator safety door lock circuit detection system to solve one or more problems existing in the prior art.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an elevator safety door lock circuit detection system, comprising: multiple distributed voltage detection modules, each uniquely corresponding to and connected in parallel to both ends of each independent switch in the safety circuit or door lock circuit, for real-time and synchronous detection of the voltage drop of each independent switch; a central processing unit, electrically connected to each of the distributed voltage detection modules, for calculating the real-time equivalent resistance value of each independent switch based on the voltage drop status, and comparing the equivalent resistance value with a preset multi-level alarm threshold to diagnose the contact status of the independent switch; an alarm indication unit, connected to the central processing unit, for locating and displaying the identification and fault type of the faulty switch when an abnormal independent switch status is diagnosed; a communication interface module, connected to the central processing unit, for uploading fault information including the identification and fault type of the faulty switch to an external monitoring system; and a power supply module, for providing operating power to each component of the system.

[0006] In one embodiment of this utility model, the distributed voltage detection module employs a differential voltage sampling circuit.

[0007] In one embodiment of the present invention, the central processing unit is integrated into the elevator control cabinet, and its interior is provided with a mapping table that stores the correspondence between the identification of each independent switch and its physical location.

[0008] In one embodiment of this utility model, the alarm indication unit includes an LED indicator and a digital display, the display showing the identification code of the fault switch and its corresponding physical location description.

[0009] In one embodiment of the present invention, the alarm indication unit is further provided with an audible and visual alarm, and the audible and visual alarm can provide differentiated alarms according to the fault level.

[0010] In one embodiment of this utility model, the communication interface module supports RS485 or CAN bus communication protocols and can exchange data with the elevator main control system in real time.

[0011] In one embodiment of this utility model, the communication interface module also integrates a wireless transmission unit, which can push fault information to the mobile terminal of remote maintenance personnel.

[0012] In one embodiment of this utility model, the fault type includes poor contact, failure to reset, or complete open circuit.

[0013] As described above, the elevator safety door lock circuit detection system of this utility model has the following beneficial effects: Multiple distributed voltage detection modules are connected in parallel to accurately correspond to each independent switch node, realizing real-time synchronous acquisition of voltage drop of each switch. Combined with the equivalent resistance value calculation model derived from voltage changes by the central processing unit, it can accurately reflect the dynamic contact characteristics of each switch contact. Compared with traditional technical solutions that can only monitor the overall on / off state of the circuit, this system has single-point fault location capability. When an abnormality is detected, the alarm indicator unit can directly identify the identity information of the faulty switch and the specific fault type, allowing maintenance personnel to quickly locate the fault source without checking each section, significantly shortening the fault response time and maintenance cycle. The system's built-in multi-level alarm threshold mechanism can provide graded warnings based on different degrees of contact defects, avoiding potential risks of missed reports and preventing false alarms caused by oversensitivity. Furthermore, the data interaction function between the communication interface module and the external monitoring system realizes the digital transmission and centralized management of fault information, providing traceable historical records and intelligent decision support for elevator operation and maintenance. The entire system, through its sophisticated monitoring and intuitive feedback design, effectively lowers the professional threshold for elevator maintenance, improves equipment reliability, and strengthens safety protection mechanisms, demonstrating significant technological advancement and practical value. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the elevator safety door lock circuit detection system provided by this utility model.

[0016] Component designation explanation 1. Distributed voltage detection module; 2. Independent switch; 3. Central processing unit; 4. Alarm indication unit; 5. Communication interface module; 6. Wireless transmission unit; 7. Power supply module. Detailed Implementation

[0017] This utility model provides an elevator safety door lock circuit detection system. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. In the description of this utility model, it should be understood that the terms "up, down, left, right," etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description; they should not be construed as limitations on this utility model. Furthermore, the terms "installation," "connection," etc., should be interpreted broadly; those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] Please see Figure 1 This utility model provides an elevator safety door lock circuit detection system, comprising: multiple distributed voltage detection modules 1, each uniquely corresponding to and connected in parallel to both ends of each independent switch 2 in the safety circuit or door lock circuit, for real-time and synchronous detection of the voltage drop of each independent switch 2; a central processing unit 3, electrically connected to each of the distributed voltage detection modules 1, for calculating the real-time equivalent resistance value of each independent switch 2 based on the voltage drop status, and comparing the equivalent resistance value with a preset multi-level alarm threshold to diagnose the contact status of the independent switch 2; an alarm indication unit 4, connected to the central processing unit 3, for locating and displaying the identification and fault type of the faulty switch when an abnormal status of the independent switch 2 is diagnosed, the fault type including poor contact, failure to reset, or complete open circuit; a communication interface module 5, connected to the central processing unit 3, for uploading fault information including the identification and fault type of the faulty switch to an external monitoring system; and a power supply module 6, for providing operating power to each component of the system.

[0019] In this embodiment, the independent switch 2 in the safety circuit or door lock circuit includes a control cabinet emergency stop switch, a main unit emergency stop switch, a turning wheel switch, a first-floor emergency stop switch, a tension wheel switch, a pit emergency stop switch, a pit maintenance switch, a counterweight buffer switch, a car buffer switch, an upper limit switch, a lower limit switch, a speed limiter switch, a bypass switch, an emergency electric switch, a safety gear switch, a car top maintenance switch, a car top emergency stop switch, and a lock lifting pin switch. Distributed voltage detection modules 1 are provided at both ends of the above independent switches 2.

[0020] The central processing unit 3 is integrated into the elevator control cabinet, and its interior contains a mapping table that stores the correspondence between the identification of each independent switch 2 and its physical location. The fault mapping table is shown in Table 1 below.

[0021] Table 1: Fault Mapping Table

[0022] As can be clearly seen from the test data listed in Table 1, the voltage drop measured at the two key test points A6 and A7 reached 106V, which is significantly higher than the alarm threshold range set by the system. The system is currently displaying the A7 fault code. Technicians can preliminarily determine that the cause of this abnormal situation may be a fault in the pit maintenance switch or that the maintenance switch was not reset to the normal working position in time after the equipment was repaired.

[0023] Optionally, the distributed voltage detection module 1 employs a differential voltage sampling circuit. The differential voltage sampling circuit effectively suppresses common-mode interference and improves detection accuracy. By setting sampling points at both ends of each independent switch 2, voltage signals are acquired in real time and transmitted to the central processing unit 3 for analysis and processing. The differential voltage sampling circuit has high input impedance and low output impedance, ensuring stability and reliability during signal transmission. Furthermore, the circuit structure is simple, easy to integrate and maintain, and can meet the practical application requirements of elevator safety door lock circuit detection systems.

[0024] To improve the visualization of the alarm indication unit 4, it includes LED indicator lights and a digital display, which simultaneously displays the fault switch's identification code and its corresponding physical location description. Specifically, the alarm indication unit 4 also includes an audible and visual alarm, which can provide differentiated alarms based on the fault level. As an integrated human-machine interface, the alarm indication unit 4 is preferably installed on the front panel of the elevator control cabinet for easy observation by maintenance personnel. Its hardware core is driven by a microprocessor, which is connected to the central processing unit 3 via a serial communication interface (such as UART or SPI) to receive instructions containing the fault switch's identification code, fault type, and fault level.

[0025] The LED indicator uses multi-color LEDs (e.g., green-yellow-red tri-color LEDs) to represent the switch status. When there is no fault, the LED displays green, indicating normal system operation. When the central processing unit 3 diagnoses that the equivalent resistance value of a switch exceeds a preset normal threshold but does not reach a danger threshold, it can drive the corresponding LED to emit a yellow, slowly flashing light, indicating potential hazards such as increased contact resistance. When the diagnosis result is a complete open circuit or a serious fault such as excessive resistance, the LED turns red and flashes rapidly until the fault is resolved. The digital display uses a dot-matrix LCD or OLED display to support mixed display of letters and numbers. The microprocessor internally stores or retrieves a fault mapping table from the central processing unit 3, binding the "identity code" (such as "A1", "A2") of each independent switch 2 with its "physical location description" (such as "control cabinet emergency stop switch", "main unit emergency stop switch"). When a fault occurs, the display will simultaneously show, for example, "Fault Code: A1" and "Location: Control Cabinet Emergency Stop Switch" information, achieving a rapid and unambiguous conversion from abstract code to specific physical location. Meanwhile, during a first-level warning, the audible and visual alarm emits an intermittent, low-sound-pressure alarm sound to alert on-site personnel without causing emergency interference; during a second-level severe fault warning, the buzzer emits a continuous, high-volume beeping sound, creating a strong visual and auditory warning requiring immediate action.

[0026] The communication interface module 5 supports RS485 or CAN bus communication protocols, enabling real-time data exchange with the elevator main control system. Specifically, the communication interface module 5 also integrates a wireless transmission unit 51, which can push fault information to the mobile terminals of remote maintenance personnel. When the central processing unit 3 diagnoses a fault, it immediately triggers the wireless transmission process of the communication interface module 5. The communication management MCU packages the fault information into a preset JSON or binary data format and sends it to the designated cloud server via the wireless module. After receiving the information, the cloud server immediately sends the simplified alarm information to the mobile terminals of the bound maintenance manager or technical team through its integrated push service (such as SMS gateway, email server, or dedicated App push channel).

[0027] In summary, this elevator safety door lock circuit detection system, through multiple distributed voltage detection modules 1, can detect the voltage drop of each independent switch 2 in the safety circuit or door lock circuit in real time and synchronously, achieving refined monitoring of key elevator components. The central processing unit 3 calculates the equivalent resistance value based on the voltage drop and compares it with the alarm threshold, accurately diagnosing the contact state of the independent switch 2 and effectively improving the accuracy of fault detection. The alarm indication unit 4 can quickly locate and display the identification of the faulty switch and the fault type when an anomaly is detected, providing maintenance personnel with intuitive fault information and greatly shortening the fault diagnosis time. Furthermore, the communication interface module 5 uploads fault information to an external monitoring system, facilitating remote monitoring and management and enhancing the safety and reliability of elevator operation. The power supply module 6 provides stable power to the entire system, ensuring the continuous operation of the detection function. Overall, this system improves elevator safety, reduces maintenance difficulty, and increases maintenance efficiency, making it of great significance to the safety management and maintenance work of the elevator industry.

[0028] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. An elevator safety door lock circuit detection system, characterized in that, include: Multiple distributed voltage detection modules (1) are uniquely corresponding to and connected in parallel to the two ends of each independent switch (2) in the safety circuit or door lock circuit, for real-time and synchronous detection of the voltage drop of each independent switch (2); The central processing unit (3) is electrically connected to each of the distributed voltage detection modules (1) and is used to calculate the real-time equivalent resistance value of each independent switch (2) based on the voltage drop state, and compare the equivalent resistance value with the preset multi-level alarm threshold to diagnose the contact state of the independent switch (2). The alarm indication unit (4) is connected to the central processing unit (3) and is used to locate and display the identification and fault type of the faulty switch when the abnormal state of the independent switch (2) is diagnosed. The communication interface module (5) is connected to the central processing unit (3) and is used to upload fault information, including the identification of the fault switch and the fault type, to the external monitoring system. The power module (6) provides power to all components of the system.

2. The elevator safety door lock circuit detection system according to claim 1, characterized in that, The distributed voltage detection module (1) adopts a differential voltage sampling circuit.

3. The elevator safety door lock circuit detection system according to claim 1, characterized in that, The central processing unit (3) is integrated into the elevator control cabinet, and its interior is equipped with a mapping table that stores the identity of each independent switch (2) and its corresponding physical location.

4. The elevator safety door lock circuit detection system according to claim 1, characterized in that, The alarm indication unit (4) includes an LED indicator and a digital display, which simultaneously displays the identification code of the fault switch and its corresponding physical location description.

5. The elevator safety door lock circuit detection system according to claim 4, characterized in that, The alarm indication unit (4) is also equipped with an audible and visual alarm, and its audible and visual alarm can provide differentiated alarms according to the fault level.

6. The elevator safety door lock circuit detection system according to claim 1, characterized in that, The communication interface module (5) supports RS485 or CAN bus communication protocols and can exchange data with the elevator main control system in real time.

7. The elevator safety door lock circuit detection system according to claim 6, characterized in that, The communication interface module (5) also integrates a wireless transmission unit (51), which can push fault information to the mobile terminal of remote maintenance personnel.

8. The elevator safety door lock circuit detection system according to claim 1, characterized in that, The fault types include poor contact, failure to reset, or complete open circuit.

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