Elevator door lock loop detection device

Abstract

The utility model discloses an elevator door lock loop detection device which comprises a single-chip microcomputer, a door knife detector, a switch short circuit detector and an alarm device, the alarm device comprises an actuator, the door knife detector is installed on an elevator door knife and connected with the single-chip microcomputer, and the single-chip microcomputer is connected with the switch short circuit detector. The input end of the switch short-circuit detector is connected with a plurality of door lock switches of an elevator door lock loop, the output end of the switch short-circuit detector is connected with the single-chip microcomputer, when an elevator runs to a target floor, the single-chip microcomputer detects the opening and closing state of an elevator door knife through the door knife detector, and the opening and closing state of a car door and a landing door of the elevator is judged; the elevator door lock loop is connected with a post-stage circuit through the actuator, so that the elevator stops running, then the elevator car door lock switch and the elevator hall door lock switch are subjected to short circuit fault detection through the switch short circuit detector, and the safety of the device for detecting the short circuit fault of the elevator door lock loop is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of elevator safety, and in particular relates to an elevator door lock circuit detection device. Background Art

[0002] Elevators are important transportation equipment in high-rise buildings, bringing great convenience to people's travel and the transportation of goods. At the same time, elevator safety issues have always been a focus of people's attention. Among them, a short circuit in the elevator door lock circuit is a typical and highly dangerous type of accident in elevator accidents. During the operation of the elevator, if a short circuit occurs in the door lock circuit, the electrical switch of the elevator door lock will fail, and it will be impossible to verify whether the elevator car door or hall door is closed, posing a potential risk of people falling or shearing accidents.

[0003] Short-circuit faults in elevator door lock circuits are primarily caused by insulation damage in the door lock circuit's switch circuit, resulting in a shorted switch. Alternatively, maintenance personnel may short-circuit the elevator door lock circuit during maintenance and then forget to restore it, causing the door lock switch to short-circuit and rendering the electrical switch inoperative. Existing elevator control circuits lack detection for short-circuit detection.

[0004] Therefore, the present invention proposes an elevator door lock circuit detection device to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide an elevator door lock circuit detection device, which can realize the short circuit fault detection of the car door lock switch and the hall door lock switch in the elevator door lock circuit.

[0006] To achieve the above-mentioned purpose, the present invention provides an elevator door lock circuit detection device, comprising:

[0007] A single-chip microcomputer, a door knife detector, a switch short-circuit detector and an alarm device, wherein the door knife detector is installed on the elevator door knife and is connected to the single-chip microcomputer. The input end of the switch short-circuit detector is connected to multiple door lock switches of the elevator door lock circuit, and the output end of the switch short-circuit detector is connected to the single-chip microcomputer. The alarm device includes an actuator, which is connected in series to the end of the elevator door lock circuit and is connected to the single-chip microcomputer.

[0008] Preferably, in the above technical solution, the door knife detector includes an ultrasonic module and a temperature sensor, and the ultrasonic module and the temperature sensor are respectively connected to the single chip microcomputer.

[0009] Preferably, in the above technical solution, the switch short circuit detector includes a first switch circuit, a second switch circuit and an optocoupler, the input end of the first switch circuit is connected to a DC power supply, and the output end is respectively connected to the car door lock switch in the elevator door lock circuit, the main hall door lock switch and the auxiliary hall door lock switch on each floor, the input end of the second switch circuit is connected to the car door lock switch in the elevator door lock circuit, the main hall door lock switch and the auxiliary hall door lock switch on each floor, the output end is connected to the input end of the optocoupler, and the output end of the optocoupler is connected to the single-chip microcomputer.

[0010] Preferably, in the above technical solution, the first switching loop and the second switching loop are composed of multiple MOS tube switches, the control end of the MOS tube switch is connected to the single-chip microcomputer, the input ends of the multiple MOS tube switches in the first switching loop are connected in parallel as the input end of the first switching loop, and the output end serves as the output end of the first switching loop; in the second switching loop, the input ends of the multiple MOS tube switches are connected in parallel as the input end of the second switching loop, and the output end serves as the output end of the second switching loop.

[0011] Preferably, in the above technical solution, the alarm device also includes a speaker and a display, the speaker is installed in the elevator car, the actuator is a relay module, the normally closed contact circuit of the relay module is connected in series with the end of the elevator door lock circuit, and the speaker and display are respectively connected to the single-chip microcomputer.

[0012] Preferably, in the above technical solution, the switch short circuit detector further includes a voltage detection module, the input end of the voltage detection module is connected to the elevator door lock circuit, and the output end is connected to the single chip microcomputer.

[0013] Preferably, in the above technical solution, a vibration sensor is further included, wherein the vibration sensor is arranged on the elevator door and is connected to the single chip microcomputer.

[0014] Compared with the existing technology, the utility model has the following beneficial effects:

[0015] 1. The utility model uses a switch short-circuit detector to detect the short circuit of the car door lock switch of the elevator door lock circuit and the main hall door lock switch and the auxiliary hall door lock switch of the floor where the elevator is located. The single-chip computer uses the switch short-circuit detector to detect whether the elevator car door lock switch, the main hall door lock switch and the auxiliary hall door lock switch of the floor where the elevator is located are conductive, thereby realizing the judgment of whether there is a short circuit fault between the elevator car door lock switch and the main hall door lock switch and the auxiliary hall door lock switch of the floor where the elevator is located. According to the principle that the elevator hall door is connected to the car door by the elevator door knife and then moves under the drive of the car door, the ultrasonic module of the door knife detector detects the distance between the two knife arms of the elevator door knife, the single-chip computer judges the open and closed status of the elevator car door and the hall door, and disconnects the elevator door lock circuit from the relay of the subsequent elevator door lock circuit detection through the actuator, so that the elevator stops running, thereby improving the safety of the short-circuit detection test of the elevator door lock circuit.

[0016] 2. The utility model detects the vibration of the elevator car running to the elevator hall door through a vibration sensor. When the single-chip microcomputer detects that the vibration amount of the elevator car collected by the vibration sensor is greater than the set threshold, the single-chip microcomputer controls the display of the alarm device to display, so as to remind the operation and maintenance personnel to check whether the door lock components of the elevator car collide with the door lock components of the hall door.

[0017] 3. The utility model monitors the input voltage of the elevator door lock circuit through the voltage detection module. When all switches in the elevator door lock circuit are closed, when the voltage of the elevator door lock circuit is lower than the set threshold, fluctuates greatly, or is zero, it indicates that there is a virtual connection at the power supply end of the door lock circuit. The single-chip microcomputer controls the alarm device to sound an alarm, thereby realizing power supply fault monitoring in the elevator door lock circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the overall circuit principle diagram of the elevator door lock circuit detection device of the present utility model.

[0019] Figure 2 This is a circuit principle diagram of the switch short circuit detector of the utility model.

[0020] Figure 3 This is an implementation diagram of the door knife detector of the present invention detecting the door knife state.

[0021] In the figure: 100 - single-chip microcomputer, 101 - switch short detector, 102 - vibration sensor, 103 - door knife detector, 104 - alarm device, 1011 - first switch circuit, 1012 - second switch circuit, 1013 - optocoupler, 1031 - ultrasonic module, 1032 - temperature sensor, 1041 - actuator, 1042 - speaker, 1043 - display. DETAILED DESCRIPTION

[0022] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the utility model is not limited by the specific implementation.

[0023] refer to Figure 1 and Figure 3 An elevator door lock circuit detection device includes a single-chip microcomputer 100, a door knife detector 103, a switch short-circuit detector 101, and an alarm device 104. The door knife detector 103 is installed on the elevator door knife and is used to detect the opening and closing status of the elevator door knife. The door knife detector 103 is connected to the single-chip microcomputer 100. The input end of the switch short-circuit detector 101 is connected to multiple switches in the elevator door lock circuit. The output end of the switch short-circuit detector 100 is connected to the single-chip microcomputer 100. The switch short-circuit detector 100 is used to detect whether there is a short-circuit fault in the car door lock switch, the main hall door lock switch of each floor, and the auxiliary hall door lock switch in the elevator door lock circuit. The alarm device 104 includes an actuator 1041, which is connected in series to the end of the elevator door lock circuit and is connected to the single-chip microcomputer 100. The actuator 1041 is used to trip the connection between the elevator door lock circuit and the subsequent circuit to stop the elevator. The single-chip microcomputer 100 is connected to the serial port of the elevator main control board to read the running position of the elevator.

[0024] Specifically, if Figure 1 and Figure 3 As shown, the door knife detector 103 includes an ultrasonic module 1031 and a temperature sensor 1032. The ultrasonic module 1031 and the temperature sensor 1032 are respectively connected to the single-chip computer 100. The working principle of the door knife detector 10 is as follows: when the elevator car runs to the destination floor, the hall door is driven by the elevator door knife installed on the car door to open or close the door in conjunction with the car door. The elevator door knife is opened, indicating that the elevator hall door is opening. At the same time, the two knife arms of the elevator door knife are in a high and low state. The ultrasonic module 1031 is installed at the bottom of the knife arm on the high side. At this time, the ultrasonic Module 1031 cannot detect the blade arm on the other side, and the single-chip computer 100 determines the open status of the elevator car door and the hall door of the floor. When the elevator door knife is closed, the distance between the two blade arms of the elevator door knife becomes shorter and returns to a flush state, indicating that the elevator car door and the hall door of the floor are closed. The ultrasonic module 1031 re-detects that the distance between the two blade arms of the door knife reaches the set threshold. The single-chip computer 100 determines that the elevator car door and the hall door of the floor are closed, thereby realizing the operating status monitoring of the elevator car door and the hall door. In this embodiment, the model of the elevator door knife is KM902670G.

[0025] Furthermore, the temperature sensor 1032 is used to collect the ambient temperature. The single-chip computer 103 performs compensation calculation on the distance data collected by the ultrasonic module 1031 according to the temperature value collected by the temperature sensor 1032, thereby improving the ultrasonic module 1031's response to the elevator door blade. In this embodiment, the single-chip computer 100 uses the chip model Atmega128L-8AUR, the ultrasonic module 1031 uses the HC-SR04 ultrasonic module, and the temperature sensor 1032 uses the DS18B20 temperature sensor.

[0026] Continue to refer Figure 1 and Figure 2 In the prior art, an elevator door lock circuit typically consists of a car door lock switch K1, a first-floor main hall door lock switch j11, a first-floor auxiliary hall door lock switch j12, an nth-floor main hall door lock switch jn1, and an nth-floor auxiliary hall door lock switch jn2, connected in series. A DC power supply 1, typically 48V, is connected to the first end of the elevator door lock circuit. A door lock circuit detection relay KM1 is connected to the end of the elevator door lock circuit. When all the door lock switches in the elevator door lock circuit are closed, relay KM1 is energized, and its contacts close to output a level signal to the elevator main control board, allowing the elevator to move up and down. The elevator door lock circuit detection device of the present invention draws a node at one end of each door lock switch in the elevator door lock circuit, namely node 1, node 2, ..., node n, and connects the node through a switch short detector 101, thereby detecting the door lock switch of the node. The switch short detector 101 includes a first switch circuit 1011, a second switch circuit 1012 and an optical coupler 1013. The input end of the first switch circuit 1011 is connected to a DC power supply 2 with a voltage of 5V, and the output end is connected to the node of each door lock switch in the elevator door lock circuit. The second switch circuit 1012 is connected to the optical coupler 1013. The input end of loop 1012 is connected to the node of each door lock switch of the elevator door lock loop, and the output end is connected to the input end of the optocoupler 1013. The output end of the optocoupler 1013 is connected to the single-chip microcomputer 100. The first switch loop 1011 and the second switch loop 1012 are composed of multiple MOS tube switches. The control end of the MOS tube switch is connected to the single-chip microcomputer 100. The input ends of the multiple MOS tube switches are connected in parallel as the input ends of the first switch loop 1011, and the output ends serve as the output ends of the first switch loop 1011. Specifically, the MOS tube switches of the first switch loop 1011 are denoted as m1, m2, ..., m n , the MOS switches of the second switch loop 1012 are n1, n2, ..., n i In this embodiment, the MOS transistor switch used is an N-channel MOS transistor switch of IPD048N06L3G, the voltage of the DC power supply 2 is 5V, and the optocoupler 1013 is an optocoupler of HTV214S1.

[0027] Continue to refer Figure 1 The alarm device 104 of the elevator door lock circuit detection device also includes a speaker 1042 and a display 1043. The speaker 1042 is installed in the elevator car. The speaker 1042 and the display 1043 are respectively connected to the single-chip computer 100. Specifically, the actuator 1041 is a relay module, and the normally closed contact circuit of the relay module is connected in series with the output end of the elevator door lock circuit.

[0028] Furthermore, the switch short circuit detector 101 further includes a voltage detection module 1014, the input end of the voltage detection module 1014 is connected to the node n of the elevator door lock circuit, and the output end is connected to the single chip microcomputer 100. Specifically, see Figure 2 The voltage detection module 1014 is composed of a resistor R1 and a resistor R2 connected in series, wherein one end of the resistor R1 is connected to the node 3, and the other end of the resistor R1 is connected to the single-chip microcomputer 100. The resistors R1 and R2 are connected in series for voltage division. The single-chip microcomputer 100 configures the corresponding IO port to AD mode through the program, and then collects the voltage at the resistor R2. After calculation, the voltage value at the node 3 can be obtained. By collecting the voltage of the node 3, the single-chip microcomputer 100 realizes the measurement of the voltage of the power supply 1 of the elevator door lock circuit.

[0029] Continue to refer Figure 1 and Figure 3 The elevator door lock circuit detection device proposed in the present invention also includes a vibration sensor 102. The vibration sensor 102 is arranged on the elevator car door. The vibration sensor 102 is connected to the single-chip computer 100. The vibration sensor 102 is used to detect the vibration of the elevator car when it runs to the destination hall door. When the single-chip computer 100 detects that the vibration amount of the elevator car collected by the vibration sensor 102 is greater than the set threshold, the single-chip computer 100 controls the display 1043 of the alarm device 104 to display an alarm to remind the operation and maintenance personnel to check whether the door lock component of the elevator car collides with the door lock component of the hall door.

[0030] Continue to refer Figure 1 In the specific implementation of the present invention, taking the elevator car running to the destination floor as an example, when the elevator car stops at the first floor, the present invention mainly performs the following steps to detect the switch short circuit fault of the elevator door lock circuit:

[0031] S1. After the single-chip microcomputer 100 detects that the elevator door knife is open through the door knife detector 103, the single-chip microcomputer 100 controls the actuator 1041 to disconnect the elevator door lock circuit and the normally closed contact circuit of the relay KM1, de-energizing the relay KM1 and ensuring that the elevator cannot operate. The input and output terminals of the MOS transistor switch n1 of the second switch circuit 1012 of the switch short detector 101 are turned on, so that the node 1 is connected to the input terminal of the optocoupler 1013. At this time, the car door lock switch K1, the first-floor main hall door lock switch j11, and the first-floor auxiliary hall door lock switch j12 are all in the off state. There is no voltage at node 1, and the output terminal of the optocoupler 1013 is low. If there is voltage at node 1, the single-chip microcomputer 100 will detect a high level at the output terminal of the optocoupler 1013. The single-chip microcomputer 100 can determine that a short circuit fault has occurred in the car door lock switch K1. If the single-chip microcomputer 100 detects a low level at the output terminal of the optocoupler 1013, step S4 is executed.

[0032] S2. When the single-chip microcomputer 100 detects that the car door lock switch K1 has a short-circuit fault, the single-chip microcomputer 100 controls the input and output terminals of the MOS transistor switch n1 to be disconnected, and controls the input and output terminals of the MOS transistor switch n2 to be connected, so that the node 2 is connected to the input terminal of the optocoupler 1013. If the first-floor main hall door lock switch j11 is not short-circuited, the single-chip microcomputer 100 detects a low level at the output terminal of the optocoupler 1013. Conversely, if the single-chip microcomputer 100 detects a high level at the output terminal of the optocoupler 1013, the single-chip microcomputer 100 can determine that the first-floor main hall door lock switch j11 is short-circuited.

[0033] S3. When the car door lock switch K1 and the first floor main hall door lock switch j11 are both short-circuited, the single-chip microcomputer 100 controls the input and output terminals of the MOS transistor switch n2 to be disconnected, and controls the input and output terminals of the MOS transistor switch n3 to be connected, so that the node 3 is connected to the input terminal of the optocoupler 1013. Similarly, if the first floor auxiliary hall door lock j12 is not short-circuited, the single-chip microcomputer 100 detects a low level at the output terminal of the optocoupler 1013. Conversely, if the single-chip microcomputer 100 detects a high level at the output terminal of the optocoupler 1013, the first floor auxiliary hall door lock switch j12 is short-circuited.

[0034] S4. The single-chip microcomputer 100 controls the input and output terminals of the MOS transistor switch m3 of the second switch loop 1012 to be disconnected, and controls the input and output terminals of the MOS transistor switch m1 of the first switch loop 1011 to be connected, so that a DC voltage of 5V is injected into node 1. At the same time, the single-chip microcomputer controls the input and output terminals of the MOS transistor switch n2 of the second switch loop 1012 to be connected, so that node 2 and the input terminal of the optocoupler 1013 are connected. If the single-chip microcomputer 100 detects a high level at the output terminal of the optocoupler 1013, it means that the door lock switch j11 of the main hall on the first floor is short-circuited. If the output terminal of the optocoupler 1013 detects a low level, it means that the door lock switch j11 of the main hall on the first floor is not short-circuited.

[0035] S5. Based on step S4, the single-chip microcomputer 100 controls the input and output terminals of the MOS transistor switch m1 of the first switch loop 1011 to be disconnected, and connects the input and output terminals of the MOS transistor switch m2, so that a DC voltage of 5V is injected into node 2. Simultaneously, the single-chip microcomputer 100 controls the input and output terminals of the MOS transistor switch n3 of the second switch loop 1012 to be connected, so that node 3 and the input terminal of the optocoupler 1013 are connected. If the single-chip microcomputer 100 detects a high level at the output terminal of the optocoupler 1013, it indicates that the first-floor auxiliary hall door lock switch j12 is short-circuited. Otherwise, it indicates that the first-floor auxiliary hall door lock switch j12 is not short-circuited.

[0036] S6. After the single-chip microcomputer 100 has completed the above query operation, if the single-chip microcomputer 100 detects that the output end of the optical coupler 1013 has a high level, the single-chip microcomputer 100 controls the display 1043 to display the door lock switch with a short circuit fault, and uses the speaker 1042 installed in the elevator car to remind people not to enter the elevator room and remind people in the elevator to leave the elevator quickly. If the single-chip microcomputer 100 detects that the output end of the optical coupler 1013 is all low, and the single-chip microcomputer 100 detects that the elevator door knife is closed through the door knife detector 103, the single-chip microcomputer 100 detects whether the voltage of the node n is lower than the set threshold, the voltage value fluctuates or is zero through the voltage detection module 1014. If the above situation exists, it means that there is a virtual connection at the connection terminal of the power supply 1 in the door lock circuit. Considering the existence of the voltage drop of each switch in the door lock circuit, the threshold is 45V, and the single-chip microcomputer 100 controls the alarm Display 1043 of device 104 displays a text alarm indicating power abnormality. When MCU 100 does not detect a high level at the output of optocoupler 1013, and MCU 100 detects through door blade detector 103 that the elevator door blade is closed, and voltage detection module 1014 detects that the voltage at node n is above 45V and below 48V, MCU 100 outputs a control signal to actuator 1041, which closes the contact circuit between the elevator door lock circuit and relay KM1, restoring normal operation of the elevator.

[0037] In summary, the present invention monitors short-circuit faults in the car door lock switch K1, the main hall door lock switch, and the auxiliary hall door lock via the switch short-circuit detector 101. Vibration sensor 102 monitors the vibration of the elevator car as it travels to the hall door to detect whether the car door lock components collide with the hall door lock components. When the microcontroller 100 detects a fault in the elevator door lock circuit, a text alarm is issued via the display 1043 of the alarm device 104, and a voice alarm is issued via the speaker 1042, to prevent accidents such as falling or shearing. Furthermore, the door knife detector 103 monitors the switch status of the elevator car door and hall door. When the car door and hall door are open, the microcontroller 100 controls the actuator 1041 to disconnect the elevator door lock circuit from the door lock circuit detection relay KM1, stopping the elevator. This improves the safety of the detection device's detection of short-circuit faults in the elevator door lock circuit.

[0038] Specifically, according to the above-mentioned switch short-circuit fault detection steps of the elevator door lock circuit, the short-circuit detection of the elevator car door lock switch and the main hall door lock switch and the auxiliary hall door lock switch of the entire floor can be achieved.

[0039] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the above teachings. The exemplary embodiments are selected and described to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to make and utilize various exemplary embodiments of the invention, as well as various options and variations. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. An elevator door lock circuit detection device, characterized in that: include: A single-chip microcomputer, a door knife detector, a switch short-circuit detector and an alarm device, wherein the door knife detector is installed on the elevator door knife and is connected to the single-chip microcomputer. The input end of the switch short-circuit detector is connected to multiple door lock switches of the elevator door lock circuit, and the output end of the switch short-circuit detector is connected to the single-chip microcomputer. The alarm device includes an actuator, which is connected in series to the end of the elevator door lock circuit and is connected to the single-chip microcomputer.

2. The elevator door lock circuit detection device according to claim 1, characterized in that: The door knife detector includes an ultrasonic module and a temperature sensor, and the ultrasonic module and the temperature sensor are respectively connected to the single chip microcomputer.

3. The elevator door lock circuit detection device according to claim 1, characterized in that: The switch short detector includes a first switch circuit, a second switch circuit and an optocoupler, wherein the input end of the first switch circuit is connected to a DC power supply, and the output end is respectively connected to the car door lock switch of the elevator door lock circuit, the main hall door lock switch and the auxiliary hall door lock switch of each floor; the input end of the second switch circuit is connected to the car door lock switch of the elevator door lock circuit, the main hall door lock switch and the auxiliary hall door lock switch of each floor, and the output end is connected to the input end of the optocoupler, and the output end of the optocoupler is connected to the single-chip microcomputer.

4. The elevator door lock circuit detection device according to claim 3, characterized in that: The first switching loop and the second switching loop are composed of multiple MOS transistor switches, the control ends of the MOS transistor switches are connected to the single-chip microcomputer, the input ends of the multiple MOS transistor switches in the first switching loop are connected in parallel as the input end of the first switching loop, and the output ends serve as the output end of the first switching loop; the input ends of the multiple MOS transistor switches in the second switching loop are connected in parallel as the input end of the second switching loop, and the output ends serve as the output end of the second switching loop.

5. The elevator door lock circuit detection device according to claim 1, characterized in that: The alarm device also includes a speaker and a display. The speaker is installed in the elevator car. The actuator is a relay module. The normally closed contact circuit of the relay module is connected in series with the end of the elevator door lock circuit. The speaker and display are respectively connected to the single-chip microcomputer.

6. The elevator door lock circuit detection device according to claim 3, characterized in that: The switch short circuit detector further includes a voltage detection module, the input end of the voltage detection module is connected to the elevator door lock circuit, and the output end is connected to the single chip microcomputer.

7. The elevator door lock circuit detection device according to claim 1, characterized in that: It also includes a vibration sensor, which is arranged on the elevator car door and is connected to the single-chip microcomputer.

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