Elevator safety detection device

Abstract

This invention discloses an elevator safety detection device, comprising at least two transmitting and receiving zones located at the entrance and exit of the car, each transmitting and receiving zone including multiple sets of transmitting and receiving tubes; a transmitting and receiving zone blocking control unit, used to identify preset risk conditions occurring in the transmitting and receiving zones and to define the preset risk conditions into zones according to the location of the transmitting and receiving zones and to output signals; and a communication unit, which receives the signals from the safety detection control unit and outputs corresponding detection result signals to the elevator control system. The elevator control system determines the elevator operating status based on the detection result signals, thereby placing the elevator in normal operating mode or elevator blocking mode.

Description

Technical Field

[0001] This invention relates to the field of electromechanical engineering, and more specifically to an elevator safety detection device. Background Technology

[0002] Conventional elevator systems use light curtains as entrance and exit protection devices to prevent passengers from being injured by impacts during the closing of the car doors.

[0003] A light curtain mainly consists of a transmitter, a receiver, and flexible cables extending from their upper ends. The transmitter has multiple infrared emitters, and the receiver has the same number and arrangement of infrared receivers. When there are no obstructions between the infrared emitters and their corresponding receivers, the signal emitted by the emitters reaches the receivers smoothly, and the receivers' internal circuitry outputs one signal. When an obstruction exists, the signal emitted by the emitters cannot reach the receivers smoothly, and the receivers' internal circuitry outputs a different signal. Based on the analysis and processing of the internal circuitry, the light curtain can output a circuit signal indicating whether an obstruction exists. The protection range of this type of light curtain is a rectangular protection area bounded by the transmitter and receiver.

[0004] When an elevator has car doors, such as a center-opening door, light curtains are installed on both the left and right car doors. The elevator can only move up or down when the car doors are fully closed. This prevents injury to passengers from the car moving while they are still entering or exiting the doors.

[0005] However, with the increasing popularity of home elevators, car-doorless home elevators have gradually gained a foothold in the market. These home elevators lack car doors and a car door arrival signal. During elevator operation, there is no car door protection. Therefore, entrance and exit safety checks do not need to consider protection against car door impacts, but should instead consider: 1. No obstructions in the entrance / exit protection area after the landing door closes / before the elevator starts moving. 2. No obstructions in the entrance / exit protection area during elevator operation. 3. If an obstruction suddenly appears in the entrance / exit protection area during elevator operation, the elevator should take emergency measures to prevent personal injury.

[0006] Currently, when the elevator is running up or down, it will stop suddenly when an obstacle appears in the entrance / exit protection zone. However, because the car door is not closed, obstacles can easily appear in the entrance / exit area. Stopping suddenly every time an obstacle appears can reduce the comfort of riding the elevator and may even frighten passengers. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an elevator safety detection device that can distinguish the risks of obstacles and take corresponding measures, and at the same time has a self-checking function, so that the elevator can also respond in advance when the light curtain fails.

[0008] To solve the above-mentioned technical problems, the present invention discloses an elevator safety detection device, comprising: an elevator safety detection device including at least two transmitting and receiving areas set at the entrance and exit of the car, each transmitting and receiving area including multiple sets of transmitting and receiving tubes;

[0009] The transmit / receive area blocking control unit is used to identify preset risk conditions occurring in the transmit / receive area, define graded regions for the preset risk conditions according to the location of the transmit / receive area, and output signals.

[0010] The communication unit receives the signal from the transmit / receive area blocking control unit and outputs the corresponding detection result signal to the elevator control system. The elevator control system determines the elevator's operating status based on the detection result signal, thereby putting the elevator into normal operating mode or elevator blocking mode.

[0011] Preferably, the communication unit outputs a safety signal when all transmit / receive areas are unobstructed; the communication unit outputs an obstruction signal when any one transmit / receive area is obstructed.

[0012] Preferably, the graded areas are defined as high-risk areas and low-risk areas; whenever the high-risk area is blocked, the communication unit outputs an emergency stop blocking signal.

[0013] Preferably, the graded areas are defined as high-risk areas and low-risk areas; the communication unit outputs a slow-stop blocking signal only when the low-risk area is blocked.

[0014] Preferably, it also includes a self-test control unit, which performs a self-test before each operation of the transmit-receive area blocking control unit, and detects whether there is a fault in the zoned transmit-receive tubes and transmits the detection result to the elevator control system.

[0015] Preferably, when all transmit / receive area self-test results are normal, the communication unit outputs a normal operation signal; the transmit / receive area blocking control unit operates normally.

[0016] If any of the transmission and reception area detection results is a fault, the communication unit outputs a fault signal, and the elevator control system controls the elevator to enter fault mode.

[0017] Preferably, when the elevator is in fault mode, the elevator stops operating.

[0018] Preferably, the safety signal is a continuous high-level signal, and the blocking signal is a continuous low-level signal.

[0019] Preferably, the emergency stop blocking signal is a first pulse signal.

[0020] Preferably, the slow-stop blocking signal is a second pulse signal.

[0021] Preferably, the normal operation signal is a continuous high level, and the fault signal is a continuous low level signal.

[0022] Preferably, it also includes a voice prompt unit, which issues a preset signal when the elevator enters the elevator malfunction mode.

[0023] Preferably, the transmit / receive area is arranged vertically along the doorway.

[0024] Preferably, the transmit and receive area includes a first transmit and receive area and a second transmit and receive area, the first transmit and receive area is a low-risk area, the second transmit and receive area is a high-risk area, and the first transmit and receive area is located above the second transmit and receive area.

[0025] Preferably, the first transmission and reception area is located 150 mm to 1800 mm above the ground at the elevator entrance / exit, and the second transmission and reception area is located 1 mm to 150 mm above the ground at the elevator entrance / exit.

[0026] Preferably, the transmission and reception area includes a first transmission and reception area and a second transmission and reception area. The first transmission and reception area is located on the outer side of the car near the landing door, and the second transmission and reception area is located on the inner side of the car away from the landing door. The transmission and reception tubes of the first transmission and reception area and the second transmission and reception area are arranged alternately.

[0027] Preferably, the distance between the detection planes formed by the first and second transmission and reception areas is less than or equal to 25 mm.

[0028] Preferably, the center-to-center distance between adjacent transmit / receive tubes in the first transmit / receive area is the same as the center-to-center distance between adjacent transmit / receive tubes in the second transmit / receive area.

[0029] Preferably, at least one transmit / receive area is evenly distributed except for the first group of transmit / receive tubes at the bottom and the first group of transmit / receive tubes at the top.

[0030] Preferably, each transmit / receive zone includes a transmitter and a receiver, and the transmitters and receivers of each transmit / receive zone are arranged alternately.

[0031] Preferably, the distance between the detection planes formed by the first and second transmission and reception areas is equal to 15 mm. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the elevator entrance / exit safety detection and communication interface in Embodiment 1 of the present invention.

[0033] Figure 2 This is a timing diagram of the device judgment before starting after leveling in the elevator control system of the present invention.

[0034] Figure 3 This is the device judgment timing diagram during the normal up and down operation of the elevator control system in the present invention.

[0035] Figure 4 This is the schematic diagram of elevator entrance and exit safety detection and communication interface in Embodiment 3 of the present invention.

[0036] Figure 5 This is the schematic diagram of elevator entrance and exit safety detection and communication interface in Embodiment 4 of the present invention. Detailed implementation manners

[0037] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0038] Embodiment 1

[0039] As Figure 1 shown, in this embodiment, the elevator safety detection device includes two sets of transmitting-receiving ends, namely two transmitting and receiving areas: transmitting end 1 - receiving end 1 (i.e., the first transmitting and receiving area), transmitting end 2 - receiving end 2 (i.e., the second transmitting and receiving area), a transmitting end flexible cable, a receiving end flexible cable, and a communication interface with the elevator control system.

[0040] One end of the transmitting end flexible cable is led out from the transmitting end; the other end is connected to the communication interface of the elevator control system. One end of the receiving end flexible cable is led out from the receiving end; the other end is connected to the communication interface of the elevator control system.

[0041] The communication interfaces respectively include a power positive interface, a power negative interface, a device signal output interface 1, and a device signal output interface 2. The elevator safety detection device is fixedly installed at the left and right ends of the entrance and exit. Transmitting end 1 and receiving end 1 are in the same plane and at the same height; transmitting end 2 and receiving end 2 are in the same plane and at the same height.

[0042] Transmitting end 1 / receiving end 1 is located at the upper part of the safety detection device, and the detection range is from 150 mm to 1800 mm above the entrance and exit ground; transmitting end 2 / receiving end 2 is located at the lower part of the safety detection device, and the detection range is from 1 mm to 150 mm above the entrance and exit ground. When the elevator without a car door moves up and down, there is a movement difference between the moving parts of the car and the stationary parts of the hoistway. An "O" shape is formed at the entrance and exit. The risks at the four line segments of the "O" shape and the areas near the line segments are inconsistent. The risk of non-intentional personal injury above the upper horizontal line segment and its vicinity is extremely small, and the risk of irreversible personal injury above the vertical line segment and its vicinity is relatively small. The risk of personal injury above the lower horizontal line segment and its vicinity is relatively large.

[0043] Transmitter 1 / Receiver 1 outputs monitoring signals within the detection range through device signal output interface 1. Transmitter 2 / Receiver 2 outputs monitoring signals through device signal output interface 2. The elevator control system determines whether the car entrance / exit is obstructed, whether the high-risk area below the car entrance / exit is obstructed, and whether the low-risk area above the car entrance / exit is obstructed based on the signals output from device signal output interface 1 / 2. In this embodiment, the device signal output interface uses a push-pull method. Transmitter 1 / Receiver 1 can detect obstacles smaller than 50 mm, while Transmitter 2 / Receiver 2 can detect obstacles smaller than 25 mm. The detection accuracy of Transmitter 2 / Receiver 2 is higher than that of Transmitter 1 / Receiver 1.

[0044] The relationship between the output signal and the detection status of the device is as follows:

[0045] When the device is fault-free and the upper section of the car entrance / exit (within the detection range of transmitter 1 / receiver 1) is blocked, signal interface 1 outputs a continuous low-level signal.

[0046] When the device is fault-free and the lower section of the car entrance / exit (within the detection range of transmitter 2 / receiver 2) is blocked, signal interface 2 outputs a continuous low-level signal.

[0047] When the device is functioning properly and the car entrance / exit is not obstructed, both signal interface 1 and signal interface 2 will output a continuous high-level signal.

[0048] Based on this, the working process of the elevator safety detection device of the present invention is as follows:

[0049] The elevator responds and moves up or down to the calling floor. After leveling, the landing door lock unlocks and the door can be opened. Passengers can enter and exit the car. Passengers complete the arrival floor registration. The landing door closes smoothly to the designated position, and the landing door lock is engaged. The elevator control system receives signals from signal output interfaces 1 and 2. If both signals from signal output interfaces 1 and 2 are high, the control system determines that there are no obstacles at the entrance / exit, and the elevator can operate normally. If any signal from signal output interfaces 1 and 2 is low, the system determines that there is an obstacle at the entrance / exit, and the elevator enters a non-operating mode. The elevator will only resume normal operation and enter normal operating status after the obstacle is removed and the signals from signal output interfaces 1 and 2 return to a high level.

[0050] The elevator begins its ascent or descent with passengers. During this process, the elevator system continuously monitors the signal output interfaces 1 and 2. If signal output interface 2 is at a low level, the elevator system determines that there is an obstacle at the entrance / exit and that the risk is high. To ensure safety, the elevator enters emergency stop mode, and the elevator safety circuit is immediately disconnected.

[0051] If device signal output interface 2 is high, then the status of device signal output interface 1 is checked. If device signal output interface 1 is low, the elevator system determines that there is an obstacle at the entrance / exit with a low risk. The elevator enters slow-stop operation mode; the elevator safety circuit is delayed in disconnecting, or the brake is delayed in braking. The method of delayed braking is to slowly reduce the voltage or current released by the brake to zero.

[0052] If signal output interface 2 of the device is at a high level, and signal output interface 1 of the device is also detected to be at a high level, the elevator system determines that there are no obstacles at the entrance / exit, and the elevator operates normally, thus entering a normal operating state.

[0053] After the elevator safety circuit is disconnected, passengers remove the obstruction and re-register to their floor. The elevator then resumes operation.

[0054] When the elevator is not in operation, it will enter normal operation mode after the obstacle is removed.

[0055] In the elevator emergency stop mode, the safety circuit is disconnected and the floor registration is canceled. After the obstacle is removed, the floor registration is re-established, and the elevator enters normal operation mode.

[0056] In the elevator slow-stop operation mode, the safety circuit disconnects after 2 seconds, and the floor registration is canceled. After the obstacle is removed, the floor registration is re-established, and the elevator enters normal operation mode.

[0057] In addition, this embodiment can also add a voice prompt function. After the elevator malfunction operation mode is turned on, a voice prompt will say "light curtain malfunction", and then the maintenance personnel will troubleshoot the light curtain malfunction, which will make it more convenient for users.

[0058] Example 2

[0059] Compared with Embodiment 1, the device in this embodiment has fewer communication interfaces, which can save interface resources and connector consumables on the control circuit board.

[0060] The elevator safety detection device of the present invention includes two sets of transmitter-receiver terminals: transmitter 1 / receiver 1, transmitter 2 / receiver 2, a flexible transmitter cable, a flexible receiver cable, and a communication interface with the elevator control system. The communication interface includes a positive power supply interface, a negative power supply interface, a self-test command interface, and a device signal output interface.

[0061] like Figures 2-3 The relationship between the output signal and the detection status of the device is as follows:

[0062] Device self-test: When a disconnection fault occurs at transmitter 2 / receiver 2, the signal interface outputs signal 2a.

[0063] Device self-test: When transmitter 2 / receiver 2 are normal and transmitter 1 / receiver 1 has a disconnection fault, the signal interface outputs signal 3a.

[0064] When the device performs a self-test without faults and the lower section of the car entrance / exit (within the detection range of transmitter 2 / receiver 2) is blocked, the signal interface outputs a disconnect signal 2b.

[0065] When the device self-tests without faults, and the lower section of the car entrance / exit (within the detection range of transmitter 2 / receiver 2) is not obstructed, but the upper section of the car entrance / exit (within the detection range of transmitter 1 / receiver 1) is obstructed, the signal interface outputs a disconnect signal 3b.

[0066] When the device self-tests without faults and the car entrance / exit is not blocked, the signal interface outputs signal 1.

[0067] In this embodiment, signal 1 is high level; signal 2a is the same as signal 2b, which is the first pulse signal; signal 3a is the same as signal 3b, which is the second pulse signal.

[0068] The control system can identify signal 1, signal 2a / 2b, and signal 3a / 3b by sampling the signal within a certain square wave period and averaging the high level samples.

[0069] The working principle of this embodiment is as follows:

[0070] If the elevator stops running for more than 5 minutes and a floor registration instruction is received, the elevator control system sends a self-test command to the device (the self-test command can be a low level). Upon receiving the self-test command, the device immediately performs a fault self-test. After the self-test, the device outputs a signal to the elevator control system through its signal output interface.

[0071] If the signal at the signal output interface of the elevator control system's receiving device is not high, the elevator control system's detection device has malfunctioned, and the elevator enters fault operation mode. If the signal at the signal output interface of the elevator control system's receiving device is high, the elevator control system's detection device is functioning normally, and the elevator can move up and down normally, entering operating mode.

[0072] The elevator responds and moves up or down to the calling floor. After leveling, the landing door lock unlocks and the door can be opened. Passengers can enter and exit the car. Passengers complete the arrival floor registration. The landing door closes smoothly to the designated position, and the landing door lock is engaged. The elevator control system receives the signal from the device signal output interface. If the signal from the device signal output interface is signal 1 (high level), the control system determines that there are no obstacles at the entrance / exit, and the elevator can move up and down normally. If the signal received by the elevator control system from the device signal output interface is not signal 1 (high level), the system determines that there are obstacles at the entrance / exit, and the elevator cannot move up or down until the obstacle is removed. The signal from the device signal output interface returns to signal 1 (high level). Only then can the elevator move up and down normally and enter the operating state.

[0073] The elevator begins its ascent or descent with passengers. During this process, the elevator system continuously monitors the signal output interfaces of the devices. If the signal port displays signal 2b, the elevator system determines that there is an obstacle at the entrance / exit and that the risk is high. To ensure safety, the elevator emergency stop circuit is activated, disconnecting the elevator safety circuit.

[0074] If the device signal port is signal 3b, the elevator system determines that there is an obstacle at the entrance / exit and the risk is low. The elevator slows down and stops; the elevator safety circuit disconnects after 2 seconds.

[0075] If the device signal port is signal 1 (high level), the elevator system determines that there are no obstacles at the entrance / exit, and the elevator operates normally and is in operation.

[0076] After the elevator safety circuit is disconnected, passengers remove the obstruction and re-register to their floor. The elevator then resumes operation.

[0077] Example 3

[0078] like Figure 4 As shown, this embodiment differs from Embodiment 1 in that the elevator safety detection device includes two sets of transmitter-receiver ends, namely two transmitter-receiver areas: transmitter 1-receiver 1 (i.e., the first transmitter-receiver area), transmitter 2-receiver 2 (i.e., the second transmitter-receiver area), transmitter 1 flexible cable, receiver 1 flexible cable, transmitter 2 flexible cable, receiver 2 flexible cable, and a communication interface with the elevator control system.

[0079] One end of the transmitting flexible cable 1 extends from transmitting end 1; the other end is connected to the communication interface of the elevator control system. One end of the receiving flexible cable 1 extends from receiving end 1; the other end is connected to the communication interface of the elevator control system. One end of the transmitting flexible cable 2 extends from transmitting end 2; the other end is connected to the communication interface of the elevator control system. One end of the receiving flexible cable 2 extends from receiving end 2; the other end is connected to the communication interface of the elevator control system.

[0080] The communication interfaces include a positive power interface, a negative power interface, a device signal output interface 1, and a device signal output interface 2. The elevator safety detection device is fixedly installed at both ends of the entrance and exit. Transmitter 1 and receiver 1 are located on the same plane and at the same height, installed on the outside of the entrance and exit (landing door side); transmitter 2 and receiver 2 are located on the same plane and at the same height, installed on the inside of the entrance and exit (car side). Alternatively, transmitter 1 and receiver 2 can be installed on one side of the entrance and exit, and receiver 1 and transmitter 2 can be installed on the other side (e.g.,...). Figure 4 (As shown). That is, the transmitting and receiving ends of each transmitting and receiving area are arranged alternately. The infrared plane formed by transmitting end 1 and receiving end 1 is 15mm away from the infrared plane formed by transmitting end 2 and receiving end 2.

[0081] To improve detection accuracy, the transmitting and receiving tubes in the two transmitting areas are evenly and alternately distributed. The density of the transmitting and receiving tubes between transmitting end 1 and receiving end 1 is the same as that between transmitting end 2 and receiving end 2. That is, the center distance between adjacent transmitting and receiving tubes between transmitting end 1 and receiving end 1 is the same as the center distance between adjacent transmitting and receiving tubes between transmitting end 2 and receiving end 2. In this embodiment, the center distance H1 is 50mm.

[0082] For higher detection accuracy, at least one transmitter-receiver pair is evenly distributed except for the first group of transmitter-receiver pairs at the bottom and the first group of transmitter-receiver pairs at the top. The first transmitter-receiver pair is evenly distributed from the first group of transmitter-receiver pairs at the bottom to the top, and the center-to-center distance H1 between adjacent transmitters and receivers at this transmitter-receiver pair is 50 mm.

[0083] On another transmitter-receiver, the vertical center-to-center distance between the bottom first group of transmitter-receivers and the bottom first group of transmitter-receivers on the first transmitter-receiver is 0±10mm; the vertical center-to-center distance between the top first group of transmitter-receivers and the top first group of transmitter-receivers on the first transmitter-receiver is also 0±10mm; the remaining groups of transmitter-receivers are evenly distributed, and the center-to-center distance H1 between adjacent transmitters and receivers on this transmitter-receiver is 50mm. These groups are staggered vertically from each group on the first transmitter-receiver. The distance between any transmitter-receiver and the transmitter-receiver on the first transmitter-receiver with the shortest vertical distance is half the center-to-center distance between adjacent transmitters and receivers on the first transmitter-receiver; in this embodiment, this distance is 25mm. This improves the obstacle detection rate at the entrance / exit.

[0084] In this embodiment, the first transmitter-receiver pair is transmitter 1-receiver 1; the other transmitter-receiver pair is transmitter 2-receiver 2. The detection range of transmitter 1-receiver 1 and transmitter 2-receiver 2 is 6±5mm to 1800mm above the ground at the entrance / exit.

[0085] Transmitter 1 and receiver 1 output monitoring signals within the detection range through device signal output interface 1. Transmitter 2 and receiver 2 output monitoring signals through device signal output interface 2. The elevator control system determines whether the car entrance / exit is obstructed based on the signals output by device signal output interface 1 / device signal output interface 2. In this embodiment, the device signal output interface outputs in a push-pull manner. The two sets of transmitter-receiver terminals are independently controlled and output. The probability of "both sets of transmitter-receiver terminals failing to detect obstacles simultaneously" is much lower than the probability of "one set of transmitter-receiver terminals failing to detect obstacles," thus improving the safety of the entrance / exit and meeting the requirements of the standard "GB-T 21739-2008 Standard for Manufacturing and Installation of Home Elevators."

[0086] The relationship between the output signal and the detection status of the device is as follows:

[0087] If the detection range of transmitter 1 / receiver 1 is blocked, signal interface 1 outputs a continuous low-level signal.

[0088] If the detection range of transmitter 2 / receiver 2 is blocked, signal interface 2 outputs a continuous low-level signal.

[0089] If the car entrance / exit is not blocked, both signal interface 1 and signal interface 2 will output a continuous high-level signal.

[0090] The working principle of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0091] Example 4

[0092] like Figure 5 As shown, the elevator safety detection device in this embodiment includes four sets of transmitter-receiver terminals: transmitter 11 / receiver 11, transmitter 12 / receiver 12, transmitter 21 / receiver 21, and transmitter 22 / receiver 22. The centers of the transmitter tubes of transmitter 11 and transmitter 12 are connected to form a line perpendicular to the ground, forming a transmitter side 1. Transmitter 11 is located at the upper part of transmitter side 1, and receiver 12 is located at the lower part of transmitter side 1. Similarly, receiver 11 and receiver 12 form a receiver side 1; transmitter 21 and transmitter 22 form a transmitter side 2; and receiver 21 and receiver 22 form a receiver side 2.

[0093] The elevator safety detection device in this embodiment also includes a flexible cable for transmitting side 1, a flexible cable for receiving side 1, a flexible cable for transmitting side 2, a flexible cable for receiving side 2, and a communication interface with the elevator control system.

[0094] The transmitting side 1 and the receiving side 2 are located on one side of the entrance / exit; the receiving side 1 and the transmitting side 2 are located on the other side of the entrance / exit.

[0095] One end of the flexible cable on transmitting side 1 extends from the top of transmitting side 1; the other end is connected to the communication interface of the elevator control system. One end of the flexible cable on transmitting side 2 extends from the top of transmitting side 2; the other end is connected to the communication interface of the elevator control system. One end of the flexible cable on receiving side 1 extends from the top of receiving side 1; the other end is connected to the communication interface of the elevator control system. One end of the flexible cable on receiving side 2 extends from the top of receiving side 2; the other end is connected to the communication interface of the elevator control system.

[0096] The communication interfaces include a positive power supply interface, a negative power supply interface, device signal interfaces 11a, 11b, 12a, 12b, 21a, 21b, 22a, and 22b. Device signal interfaces a and b are connected in series in the electrical circuit to provide disconnect or connect signals for the electrical circuit.

[0097] Transmitter 11 / Receiver 11 outputs monitoring signals and self-test signals within the detection range through device signal interfaces 11a / 11b. Transmitter 12 / Receiver 12 outputs monitoring signals and self-test signals within the detection range through device signal interfaces 12a / 12b. Transmitter 22 / Receiver 22 outputs monitoring signals and self-test signals through device signal interfaces 22a / 22b. Based on the signals output from the four sets of device signal interfaces, the elevator control system determines whether the car entrance / exit is obstructed and assesses the different risk levels associated with the entrance / exit.

[0098] The relationship between the output signal and the detection status of the device is as follows:

[0099] If the lower section of the outer car entrance / exit (within the detection range of transmitter 12 / receiver 12) is blocked, signal interface 12a / 12b outputs a disconnect signal.

[0100] If the upper section of the outer car entrance / exit (within the detection range of transmitter 11 / receiver 11) is blocked, the signal interface 11a / 11b outputs a disconnect signal.

[0101] If the lower section of the inner car entrance / exit (within the detection range of transmitter 22 / receiver 22) is blocked, signal interface 22a / 22b outputs a disconnect signal.

[0102] If the upper section of the outer car entrance / exit (within the detection range of transmitter 21 / receiver 21) is blocked, signal interfaces 21a / 21b will output a disconnect signal.

[0103] If the car entrance and exit are not blocked, all four sets of device signal interfaces will output a connection signal.

[0104] The workflow of this embodiment is as follows:

[0105] The elevator responds and moves up or down to the calling floor. After leveling, the floor door lock unlocks and the floor door can be opened. Passengers can enter and exit the car. Passengers complete the arrival floor registration. The floor door closes smoothly to the designated position, and the floor door lock is engaged. If all four sets of device signals are active, and the corresponding circuit is connected, the control system determines that there are no obstacles at the entrance / exit, and the elevator can operate normally. If any one of the four sets of device signals is inactive, and the corresponding circuit is disconnected, the system determines that there is an obstacle at the entrance / exit, and the elevator enters a non-operating mode. Only after the obstacle is removed and all four sets of device signals are reconnected can the elevator operate normally and enter normal operating status.

[0106] The elevator begins moving up and down with passengers. During this process, the elevator system continuously monitors signals from four sets of devices. If signal interfaces 12a / 12b or 22a / 22b are disconnected, the elevator system determines that there is an obstacle at the entrance / exit and that the risk is high. The elevator enters emergency stop mode, and the elevator safety circuit is immediately disconnected.

[0107] If signal interfaces 12a / 12b and 22a / 22b are both ON, then the status of device signal output interfaces 11a / 11b and 21a / 21b is checked. If either 11a / 11b or 21a / 21b is OFF, the elevator system determines that there is an obstacle at the entrance / exit with a low risk. The elevator enters slow-stop operation mode; the elevator safety circuit disconnects after a delay.

[0108] If all four sets of device signals are ON, the elevator system determines that there are no obstacles at the entrance / exit, and the elevator operates normally, remaining in normal operating condition.

[0109] Furthermore, the operation of the external device can be determined through the internal signal interfaces 22a / 22b and 21a / 21b. If the internal signal interfaces 22a / 22b and 21a / 21b are connected, while any one of the external signals 12a / 12b and 11a / 11b is connected, it is determined that the external device has a certain probability of malfunctioning. To ensure safety, the elevator enters a slow-stop mode. After stopping, the signals of the external device are checked again. If the signals do not change within a certain period of time, the elevator slowly moves to the floor level, releases passengers, and then enters fault mode.

[0110] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. An elevator safety detection device, characterized in that, include: At least two transmitting and receiving zones are located at the entrance and exit of the car, and each transmitting and receiving zone includes multiple sets of transmitting and receiving tubes; The transmit / receive area blocking control unit is used to identify preset risk conditions occurring in the transmit / receive area, define graded regions for the preset risk conditions according to the location of the transmit / receive area, and output signals. The communication unit receives the signal from the transmit / receive area blocking control unit and outputs the corresponding detection result signal to the elevator control system. The elevator control system determines the elevator operation status based on the detection result signal, thereby putting the elevator into normal operation mode or elevator blocking mode. The tiered areas are defined as high-risk areas and low-risk areas; Whenever the high-risk area is blocked, the communication unit outputs an emergency stop blocking signal; The communication unit outputs a slow-stop blocking signal only when the low-risk area is blocked; The transmission and reception area is arranged vertically along the doorway; The launch and reception area includes a first launch and reception area and a second launch and reception area. The first launch and reception area is a low-risk area, and the second launch and reception area is a high-risk area. The first launch and reception area is located above the second launch and reception area. The location of the first launch and reception area is 150 mm to 1800 mm above the ground at the elevator entrance and exit, and the location of the second launch and reception area is 1 mm to 150 mm above the ground at the elevator entrance and exit. The first transmitting and receiving area is located on the outer side of the car near the landing door, and the second transmitting and receiving area is located on the inner side of the car away from the landing door; the transmitting and receiving tubes of the first transmitting and receiving area and the transmitting and receiving tubes of the second transmitting and receiving area are arranged alternately.

2. The elevator safety detection device according to claim 1, characterized in that, When all transmit and receive areas are unobstructed, the communication unit outputs a safety signal; The communication unit outputs an obstruction signal whenever one of its transmit / receive areas is blocked.

3. The elevator safety detection device according to claim 1, characterized in that, It also includes a self-test control unit, which performs a self-test before each operation of the transmit-receive area blocking control unit, and detects whether there are any faults in the zoned transmit-receive tubes and transmits the detection results to the elevator control system.

4. The elevator safety detection device according to claim 3, characterized in that, When all transmit and receive area self-test results are normal, the communication unit outputs a normal operation signal; the transmit and receive area blocking control unit operates normally. If any of the transmission and reception area detection results is a fault, the communication unit outputs a fault signal, and the elevator control system controls the elevator to enter fault mode.

5. The elevator safety detection device according to claim 4, characterized in that, When the elevator is in fault mode, the elevator stops running.

6. The elevator safety detection device according to claim 2, characterized in that, The safety signal is a continuous high-level signal, and the blocking signal is a continuous low-level signal.

7. The elevator safety detection device according to claim 1, characterized in that, The emergency stop blocking signal is the first pulse signal.

8. The elevator safety detection device according to claim 1, characterized in that, The slow-stop blocking signal is the second pulse signal.

9. The elevator safety detection device according to claim 4, characterized in that, The normal operating signal is a continuous high level, and the fault signal is a continuous low level.

10. The elevator safety detection device according to claim 1, characterized in that, It also includes a voice prompt unit, which issues a preset signal when the elevator enters elevator malfunction mode.

11. The elevator safety detection device according to claim 1, characterized in that, The distance between the detection planes formed by the first and second transmission and receiving areas is less than or equal to 25 millimeters.

12. The elevator safety detection device according to claim 11, characterized in that, The center-to-center distance between adjacent transmit / receive tubes in the first transmit / receive area is the same as the center-to-center distance between adjacent transmit / receive tubes in the second transmit / receive area.

13. The elevator safety detection device according to claim 12, characterized in that, At least one transmit / receive zone is evenly distributed except for the first group of transmit / receive tubes at the bottom and the first group of transmit / receive tubes at the top.

14. The elevator safety detection device according to claim 1, characterized in that, Each transmit / receive zone includes a transmitter and a receiver, and the transmitters and receivers in each transmit / receive zone are arranged alternately.

15. The elevator safety detection device according to claim 11, characterized in that, The distance between the detection planes formed by the first and second transmission and receiving areas is 15 millimeters.

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