Unintended car movement protection device for elevator, and elevator

Abstract

An unintended car movement protection device for an elevator and an elevator. The unintended car movement protection device (100) for an elevator comprises: a signal generation unit (10) adapted to be connected to each signal injection point (210) in an elevator door lock circuit (200), the elevator door lock circuit (200) comprising a plurality of elevator door locks (S) connected in series, and each signal injection point (210) being arranged between two adjacent elevator door locks (S); and a control unit (20) configured to, upon receiving a door lock short-circuit detection enable signal sent by an elevator controller (300), control the signal generation unit (10) to send a detection signal to a corresponding signal injection point (210) and, on the basis of an electrical signal output by the corresponding detection point (220), perform door lock short-circuit detection, each detection point (220) being arranged at a signal output end of an elevator door lock (S).

Description

Elevator anti-accidental movement protection device and elevator

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410942680.2, filed on July 12, 2024, entitled "Elevator Anti-Accident Movement Protection Device and Elevator", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of elevator technology, and in particular to an elevator anti-accidental movement protection device and an elevator. Background Technology

[0004] According to the "Elevator Type Test Rules" (TSG T7007-2022), when the car is in the unlocking zone, the car door is open, and the landing door lock is released, the correct operation of the electrical safety devices in the closed position of the car door, the electrical safety devices in the locked position of the landing door locking device, and the monitoring signals should be monitored and checked. If a fault is detected, normal elevator operation should be prevented. That is, the elevator door lock circuit should be short-circuited for testing.

[0005] In related technologies, there are two main methods for detecting elevator door lock short circuits: One method involves adding several safety relays to the system. The relays' actions are combined to detect the locks of the front and rear car doors and the landing door. The relay commands originate from the elevator controller. Due to the addition of safety relays, the cost of door lock detection is high. The second method uses an additional signal source to send diagnostic waves, which are then received by the elevator controller to determine if a door lock short circuit exists. In this type of solution, the signal source and receiver are implemented by separate components, making the system design more complex. Summary of the Invention

[0006] This disclosure aims to at least partially address one of the technical problems in the related art. To this end, the first objective of this disclosure is to provide an elevator anti-accidental movement protection device that does not require a safety relay for detection, thus reducing the cost of door lock short-circuit detection. Furthermore, by integrating the signal generation unit within the elevator anti-accidental movement protection device, door lock short-circuit detection can be performed on the door lock circuit through the elevator anti-accidental movement protection device, simplifying circuit design and wiring, and making the system more compact.

[0007] The second objective of this disclosure is to propose an elevator.

[0008] The third objective of this disclosure is to propose a method for detecting short circuits in elevator door locks.

[0009] To achieve the above objectives, an elevator anti-accidental movement protection device is provided according to a first aspect embodiment of the present disclosure, comprising: a signal generating unit adapted to connect to each signal injection point in an elevator door lock circuit, wherein the elevator door lock circuit includes multiple elevator door locks connected in series, and each signal injection point is disposed between two adjacent elevator door locks; and a control unit connected to the signal generating unit and adapted to connect to each detection point in the elevator door lock circuit, wherein the control unit is configured to, upon receiving a door lock short-circuit detection enable signal sent by an elevator controller, control the signal generating unit to send a detection signal to the corresponding signal injection point, and perform door lock short-circuit detection based on the electrical signal output by the corresponding detection point, wherein each detection point is disposed at the signal output terminal of each elevator door lock.

[0010] An elevator anti-accidental movement protection device according to an embodiment of this disclosure includes: a signal generating unit and a control unit. The signal generating unit is adapted to connect to each signal injection point in the elevator door lock circuit. The control unit is configured to, upon receiving a door lock short-circuit detection enable signal sent by the elevator controller, control the signal generating unit to send a detection signal to the corresponding signal injection point, and perform door lock short-circuit detection based on the electrical signal output by the corresponding detection point. Therefore, the elevator anti-accidental movement protection device internally incorporates a signal generating unit. By sending a detection signal to the elevator door lock circuit and performing door lock short-circuit detection based on the electrical signal output by the detection point, there is no need to add a safety relay, reducing elevator costs. Furthermore, the integration of the signal generating unit and the control unit within the elevator anti-accidental movement protection device simplifies circuit design and wiring, making the system more compact.

[0011] According to one embodiment of this disclosure, when the front door of the elevator is fully open, the front door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid; and / or when the rear door of the elevator is fully open, the rear door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid.

[0012] According to one embodiment of this disclosure, the signal injection point further includes an input terminal of the front door lock, which is adapted to input a safety circuit signal. When the front door lock short-circuit detection flag is valid and the safety circuit signal is high, the front door lock is short-circuited according to the electrical signal output by each detection point.

[0013] According to one embodiment of this disclosure, the control unit is also adapted to connect to the input terminal of the front door lock, and the control unit is further configured to perform fault detection on the safety circuit signal based on the electrical signal output from the input terminal of the front door lock.

[0014] According to one embodiment of this disclosure, the signal injection point further includes an input terminal of the rear door lock, which is adapted to input a safety circuit signal. When the short-circuit detection flag of the rear door lock is valid and the safety circuit signal is high, the rear door lock is short-circuited for detection based on the electrical signal output from the detection point set behind the rear door lock.

[0015] According to one embodiment of the present disclosure, the control unit is also adapted to connect to the input terminal of the rear door lock. The control unit is also configured to send a detection signal to the input terminal of the rear door lock when the safety circuit signal is low, and to perform short-circuit detection on the rear door lock based on the electrical signal output from the detection point set behind the rear door lock.

[0016] According to one embodiment of this disclosure, the signal generating unit sequentially sends the same detection signal to the signal injection point in a time-division multiplexing manner.

[0017] According to one embodiment of this disclosure, the control unit is further configured to perform fault detection on the signal generating unit by inputting a detection signal to a signal injection point and based on the corresponding electrical signal output by the adjacent detection point.

[0018] According to one embodiment of this disclosure, the elevator anti-accidental movement protection device further includes: a signal transmission unit, the input terminal of which is adapted to connect to each detection point, the output terminal of which is connected to the control unit, and the signal transmission unit is configured to perform voltage transformation on the electrical signal output by each detection point and transmit the voltage-transformed electrical signal to the control unit.

[0019] According to one embodiment of the present disclosure, the elevator anti-accidental movement protection device further includes a door lock bypass circuit, one end of which is adapted to be connected to one end of the elevator door lock circuit, and the other end of which is adapted to be connected to the other end of the elevator door lock circuit. The control unit is also connected to the door lock bypass circuit and is further configured to control the door lock bypass circuit to disconnect during the door lock short circuit detection process.

[0020] According to one embodiment of this disclosure, the control unit is adapted to communicate with the elevator controller to send the door lock short-circuit detection result to the elevator controller.

[0021] To achieve the above objectives, an elevator is provided according to a second aspect of this disclosure, comprising: an elevator door lock circuit including a plurality of elevator door locks connected in series; an elevator controller adapted to send a door lock short-circuit detection enable signal; and an elevator anti-accidental movement protection device of any of the foregoing embodiments, the elevator anti-accidental movement protection device being connected to the elevator door lock circuit, the elevator anti-accidental movement protection device being configured to send a detection signal to the elevator door lock circuit upon receiving the door lock short-circuit detection enable signal, and to perform door lock short-circuit detection based on the electrical signal output by the elevator door lock circuit.

[0022] According to the elevator of the present disclosure embodiment, by adopting the above-described elevator anti-accidental movement protection device, the safety relay is not required to participate in the detection. Therefore, the cost of door lock short circuit detection is low. Furthermore, the signal generation unit is integrated inside the elevator anti-accidental movement protection device, so the door lock circuit can be detected by the elevator anti-accidental movement protection device, which simplifies the circuit design and wiring and makes the system more compact.

[0023] To achieve the above objectives, a method for detecting short circuits in elevator door locks is proposed according to a third aspect of this disclosure. This method is applied to an elevator anti-accidental movement protection device. The elevator anti-accidental movement protection device includes a signal generating unit adapted to connect to each signal injection point in the elevator door lock circuit. The elevator door lock circuit includes multiple elevator door locks connected in series, and each signal injection point is located between two adjacent elevator door locks. The method includes: upon receiving a door lock short circuit detection enable signal from the elevator controller, controlling the signal generating unit to send a detection signal to the corresponding signal injection point; and performing door lock short circuit detection based on the electrical signal output by the corresponding detection point. Each detection point is located at the signal output terminal of each elevator door lock.

[0024] According to the elevator door lock short-circuit detection method of this disclosure, upon receiving a door lock short-circuit detection enable signal sent by the elevator controller, the control signal generating unit sends a detection signal to the corresponding signal injection point and performs door lock short-circuit detection based on the electrical signal output by the corresponding detection point. The signal generating unit is adapted to connect to each signal injection point in the elevator door lock circuit, which includes multiple elevator door locks connected in series. Each signal injection point is located between two adjacent elevator door locks, and each detection point is located at the signal output terminal of each elevator door lock. Therefore, by sending a detection signal to the elevator door lock circuit through the signal generating unit inside the elevator anti-accidental movement protection device and performing door lock short-circuit detection based on the electrical signal output by the detection point, there is no need to add a safety relay, reducing elevator costs. Furthermore, the integration of the signal generating unit and the control unit within the elevator anti-accidental movement protection device simplifies circuit design and wiring, making the system more compact.

[0025] According to one embodiment of this disclosure, when the front door of the elevator is fully open, the front door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid; and / or when the rear door of the elevator is fully open, the rear door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid.

[0026] According to one embodiment of this disclosure, the control signal generating unit sends a detection signal to a corresponding signal injection point, including: the control signal generating unit sequentially sends the same detection signal to the signal injection point.

[0027] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0028] Figure 1 is a schematic diagram of an elevator anti-accidental movement protection device according to an embodiment of the present disclosure;

[0029] Figure 2 is a schematic diagram of an elevator anti-accidental movement protection device according to another embodiment of the present disclosure;

[0030] Figure 3 is a schematic diagram of an elevator anti-accidental movement protection device according to another embodiment of the present disclosure;

[0031] Figure 4 is a schematic diagram of an elevator anti-accidental movement protection device including a signal transmission unit according to an embodiment of the present disclosure;

[0032] Figure 5 is a schematic diagram of an elevator anti-accidental movement protection device including a door lock bypass circuit according to an embodiment of the present disclosure;

[0033] Figure 6 is a schematic flowchart of a door lock short circuit detection according to an embodiment of the present disclosure;

[0034] Figure 7 is a flowchart illustrating an elevator door lock short-circuit detection method according to an embodiment of the present disclosure. Detailed Implementation

[0035] Embodiments of this disclosure are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0036] The following description, with reference to the accompanying drawings, describes an elevator anti-accidental movement protection device and an elevator according to embodiments of the present disclosure.

[0037] Figure 1 is a schematic diagram of an elevator anti-accidental movement protection device according to an embodiment of the present disclosure. As shown in Figure 1, the elevator anti-accidental movement protection device 100 includes: a signal generating unit 10 and a control unit 20.

[0038] The signal generating unit 10 is adapted to connect to each signal injection point 210 in the elevator door lock circuit 200, wherein the elevator door lock circuit 200 includes a plurality of elevator door locks S connected in series, and each signal injection point 210 is disposed between two adjacent elevator door locks S; the control unit 20 is connected to the signal generating unit 10 and adapted to connect to each detection point 220 in the elevator door lock circuit 200, wherein the control unit 20 is configured to, upon receiving a door lock short-circuit detection enable signal sent by the elevator controller 300, control the signal generating unit 10 to send a detection signal to the corresponding signal injection point 210, and perform door lock short-circuit detection according to the electrical signal output by the corresponding detection point 220, wherein each detection point 220 is disposed at the signal output terminal of each elevator door lock S.

[0039] The elevator includes a front door and a rear door, each with its own door lock. After the front door is fully open, its door lock should be in the open position; similarly, after the rear door is fully open, its door lock should be in the open position. Therefore, a short-circuit test of the door locks is required after the front door and / or the elevator door is fully open to determine if there is a malfunction. After confirming that the front door and / or the elevator door is fully open, the elevator controller 300 sends a door lock short-circuit test enable signal to the elevator anti-accidental movement protection device 100. During the short-circuit test, the elevator door locks S should keep the front door and / or the rear door open. This is because the door locks are closed when the elevator door is closed, which would affect the short-circuit test and lead to incorrect results. The elevator door lock circuit 200 includes multiple elevator door locks S connected in series. Each signal injection point 210 is located between two adjacent elevator door locks S, and each detection point 220 is located at the signal output terminal of each elevator door lock S. This allows for the determination of whether each elevator door lock S is short-circuited. When the control unit 20 receives a door lock short-circuit detection enable signal from the elevator controller 300, the control signal generation unit 10 sends a detection signal to the corresponding signal injection point 210, and then determines whether the door lock is short-circuited based on the electrical signal output by the corresponding detection point 220. If the electrical signal output by the corresponding detection point 220 is the same as the detection signal, a short circuit occurs between the corresponding signal injection point 210 and the corresponding detection point 220. If the electrical signal output by the corresponding detection point 220 is different from the detection signal, there is no short circuit between the corresponding signal injection point 210 and the corresponding detection point 220.

[0040] In one alternative implementation, the control unit 20 is an MCU (Microcontroller Unit).

[0041] In the above embodiments, by sending a detection signal to the elevator door lock circuit and performing door lock short-circuit detection based on the electrical signal output from the detection point, door lock short-circuit detection can be achieved without adding a safety relay, reducing the hardware cost of the elevator. Furthermore, the elevator anti-accidental movement protection device has an internal signal generation unit, simplifying circuit design and wiring, making the system more compact, and reducing delays and interference during detection signal transmission, thereby improving system reliability. Moreover, the door lock short-circuit detection performed by the elevator anti-accidental movement protection device can effectively reduce the computational burden on the elevator controller, thereby improving the performance and efficiency of the motor main control board.

[0042] In some embodiments, when the front door of the elevator is in the open position, the front door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid; and / or when the rear door of the elevator is in the open position, the rear door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid.

[0043] The door lock short-circuit detection enable signal includes a front door lock short-circuit detection flag and a rear door lock short-circuit detection flag. Sensors are installed on both the front and rear doors to detect whether they are fully open and send the results to the elevator controller 300. When the elevator controller 300 receives a front door open-to-position signal, it generates a front door lock short-circuit detection flag, thus making the front door lock short-circuit detection flag valid. Similarly, when the elevator controller 300 receives a rear door open-to-position signal, it generates a rear door lock short-circuit detection flag, thus making the rear door lock short-circuit detection flag valid. Both the front and rear door lock short-circuit detection flags are valid when both are fully open.

[0044] It should be noted that when the short-circuit detection flags for both the front and rear door locks are valid, the short-circuit detection for the front door locks should be performed first, followed by the short-circuit detection for the rear door locks.

[0045] In the above embodiments, by setting the front door lock short circuit detection flag and the rear door lock short circuit detection flag in the door lock short circuit detection enable signal, short circuit detection can be performed on the front door lock and the rear door lock respectively, thereby generating more accurate fault diagnosis information and helping to quickly eliminate faults.

[0046] In some embodiments, as shown in FIG2, the signal injection point further includes the input terminal of the front door lock, which is suitable for inputting the safety circuit signal. When the front door lock short-circuit detection flag is valid and the safety circuit signal is high, the front door lock is short-circuited according to the electrical signal output by each detection point 220.

[0047] The elevator door locks connected in series include the front car door lock S1, the front landing door lock S2, the rear car door lock S3, and the rear landing door lock S4. The front door lock corresponds to the front car door lock S1 in Figure 2. If the safety circuit signal is low, the safety circuit signal is faulty. When the safety circuit signal is faulty, it will affect the short-circuit detection result. Therefore, when the safety circuit signal is faulty, the door lock short-circuit detection will not continue. If the safety circuit signal is high, the safety circuit signal is normal, and the short-circuit detection can continue. The short-circuit detection is performed based on the safety circuit signal and the electrical signal output by each detection point 220. If the electrical signal output by a certain detection point is high, a short circuit occurs between that detection point and the input terminal of the front door lock.

[0048] In some embodiments, as shown in FIG3, the control unit 20 is also adapted to connect to the input terminal 214 of the front door lock, and the control unit 20 is further configured to perform fault detection on the safety circuit signal based on the electrical signal output from the input terminal 214 of the front door lock.

[0049] Understandably, since the input terminal 214 of the front door lock is the injection point for the safety circuit signal, the control unit 20 can also be directly connected to the input terminal 214 of the front door lock to determine whether the safety circuit signal is faulty based on the level of the input terminal 214. When the input terminal 214 of the front door lock is low, the safety circuit fault signal is low; when the input terminal 214 of the front door lock is high, the safety circuit fault signal is high.

[0050] Taking Figure 3 as an example, multiple detection points include a first detection point 221, a second detection point 222, a third detection point 223, and a fourth detection point 224. The input terminal 214 of the front car door lock S1 is the signal injection point for the safety circuit signal. The control unit 20 determines whether the safety circuit signal is normal based on the level of the input terminal 214 of the front car door lock S1. When the safety circuit signal is high, the control unit 20 performs a short-circuit test on the front door lock. If the first detection point 221 is high, the input terminal 214 of the front car door lock S1 is short-circuited with the first detection point 221. If the first detection point 221 is low, the input terminal 214 of the front car door lock S1 is not short-circuited with the first detection point 221, and the short-circuit detection continues to the next detection point. If the second detection point 222 is high, the input terminal 214 of the front car door lock S1 is short-circuited with the second detection point 222. If the second detection point 222 is low, the input terminal 214 of the front car door lock S1 is not short-circuited with the second detection point 222, and the short-circuit detection continues to the next detection point, and so on, until all detection points 221-224 have completed the short-circuit detection.

[0051] In one alternative implementation, after the front door lock short circuit detection is completed, the control unit 20 will clear the front door lock short circuit detection flag.

[0052] In some embodiments, the signal injection point further includes the input terminal of the rear door lock, which is adapted to input a safety circuit signal. When the short-circuit detection flag of the rear door lock is valid and the safety circuit signal is high, the rear door lock is short-circuited for detection based on the electrical signal output from the detection point set behind the rear door lock.

[0053] The rear door lock corresponds to the rear car door lock S3 in Figure 2. When the front door lock does not require short-circuit detection, the elevator front door is in the closed state. Therefore, the front car door lock S1 and the front landing door lock S2 are in the closed state. The safety circuit signal is input to the input terminal of the rear car door lock S3 through the front car door lock S1 and the front landing door lock S2. Therefore, the input terminal of the rear car door lock S3 is the injection point of the safety circuit signal. When the safety circuit signal is high, the rear door lock can be directly short-circuited based on the safety circuit signal and the electrical signal output from the detection points 223-224 set after the rear door lock.

[0054] In some embodiments, the control unit 20 is also adapted to connect to the input terminal of the rear door lock. The control unit 20 is also configured to send a detection signal to the input terminal of the rear door lock when the safety circuit signal is low, and to perform short-circuit detection on the rear door lock according to the electrical signal output from the detection point set behind the rear door lock.

[0055] The control unit 20 can also be directly connected to the input terminal of the rear door lock to determine whether the safety circuit signal has failed based on the electrical signal output from the input terminal of the rear door lock. If the safety circuit signal fails, the control signal generating unit 10 sends a detection signal to the input terminal of the rear door lock, and then performs a short-circuit detection on the rear door lock based on the detection signal and the electrical signal output from the detection points 223-224 set behind the rear door lock.

[0056] Taking Figure 3 as an example, the detection point before the rear door lock S3 is the second detection point 222. When the front door lock does not need to be short-circuited, the second detection point 222 is suitable for inputting the safety circuit signal. The control unit 20 can determine whether the safety circuit signal is faulty based on the electrical signal output by the second detection point 222. If the electrical signal output by the second detection point 222 is high, the safety circuit signal is high, and the rear door lock can be short-circuited directly based on the safety circuit signal and the electrical signals output by the third detection point 223 and the fourth detection point 224. If the electrical signal output by the second detection point 222 is low, the safety circuit signal is low, and the control unit 20 can control the signal generation unit 10 to send a detection signal to the second signal injection point 212. The control unit 20 can then short-circuit the rear door lock based on the detection signal and the electrical signals output by the third detection point 223 and the fourth detection point 224. If the third detection point 223 is high, then the second detection point 222 and the third detection point 223 are shorted. If the third detection point 223 is low, then the second detection point 222 and the third detection point 223 are not shorted, and the shorting detection continues to the next detection point. If the fourth detection point 224 is high, then the second detection point 222 and the fourth detection point 224 are shorted. If the fourth detection point 224 is low, then the second detection point 222 and the fourth detection point 224 are not shorted.

[0057] Similarly, once the short circuit detection of the rear door lock is completed, the control unit 20 will clear the short circuit detection flag of the rear door lock.

[0058] In some embodiments, the signal generating unit 10 sends the same detection signal to the signal injection point sequentially in a time-division manner.

[0059] In other words, if detection signals are sent to multiple signal injection points 210 simultaneously, it may cause errors in the door lock short-circuit detection result. Therefore, the signal generating unit 10 adopts a time-division multiplexing method, sending the same detection signal to the signal injection points sequentially. In each short-circuit detection process, the control unit 20 controls the signal generating unit 10 to send a detection signal to only one signal injection point. The remaining signal injection points do not receive the detection signal, so they are at a low level. Because only one signal injection point receives the detection signal at any given time, the detection signal of the signal generating unit can remain unchanged.

[0060] After a detection signal is sent at a signal injection point, the corresponding detection point becomes the detection point after the signal injection point.

[0061] Taking Figure 3 as an example, multiple signal injection points include a first signal injection point 211, a second signal injection point 212, and a third signal injection point 213. The control unit 20 controls the signal generation unit 10 to send a detection signal to the first signal injection point 211, while the second signal injection point 212 and the third signal injection point 213 are at a low level. At this time, it is detected whether the first signal injection point 211 is short-circuited with the second detection point 222, the third detection point 223, and the fourth detection point 224, respectively. If the second detection point 222 is high, then the first signal injection point 211 and the second detection point 222 are short-circuited. If the second detection point 222 is low, then the first signal injection point 211 and the second detection point 222 are not short-circuited, and the short-circuit detection continues for the next detection point. If the third detection point 223 is high, then the first signal injection point 211 and the third detection point 223 are short-circuited. If the third detection point 223 is low, then the first signal injection point 211 and the third detection point 223 are not short-circuited, and the short-circuit detection continues for the next detection point. If the fourth detection point 224 is high, then the first signal injection point 211 and the fourth detection point 224 are short-circuited. If the fourth detection point 224 is low, then the first signal injection point 211 and the fourth detection point 224 are not short-circuited. Then, the control unit 20 controls the signal generation unit 10 to send a detection signal to the second signal injection point 212. The first signal injection point 211 and the third signal injection point 213 are at a low level. At this time, it is detected whether the second signal injection point 212 is short-circuited with the third detection point 223 and the fourth detection point 224 respectively. If the third detection point 223 is at a high level, the first signal injection point 211 and the third detection point 223 are short-circuited. If the third detection point 223 is at a low level, the first signal injection point 211 and the third detection point 223 are not short-circuited, and the short-circuit detection continues to the next detection point. If the fourth detection point 224 is at a high level, the first signal injection point 211 and the fourth detection point 224 are short-circuited. If the fourth detection point 224 is at a low level, the first signal injection point 211 and the fourth detection point 224 are not short-circuited. Then, the control unit 20 controls the signal generation unit 10 to send a detection signal to the third signal injection point 213. The first signal injection point 211 and the second signal injection point 212 are at a low level. At this time, it is detected whether the third signal injection point 213 is short-circuited with the fourth detection point 224. If the fourth detection point 224 is at a high level, the first signal injection point 211 and the fourth detection point 224 are short-circuited. If the fourth detection point 224 is at a low level, the first signal injection point 211 and the fourth detection point 224 are not short-circuited. Then, the short-circuit detection of all detection points 221-224 is completed.

[0062] In one optional implementation, the judgment process for each short-circuit detection is a preset duration.

[0063] It should be noted that when performing a short circuit test on the rear door lock, if the safety circuit signal is low, a test signal can also be sent to the second signal injection point 212, and then the short circuit test on the rear door lock can continue.

[0064] In the above embodiments, the detection signal is sent in a time-division manner according to the detection process, so the waveform of the detection signal can remain unchanged. Therefore, the signal sending unit only needs to design one signal source, which further simplifies the circuit design.

[0065] In some embodiments, the control unit 20 is further configured to perform fault detection on the signal generation unit 10 by inputting a detection signal to a signal injection point and based on the corresponding electrical signal output by the adjacent detection point.

[0066] Taking Figure 3 as an example, the first detection point 221 is the adjacent detection point 220 of the first signal injection point 211, the second detection point 222 is the adjacent detection point 220 of the second signal injection point 212, and the third detection point 223 is the adjacent detection point 220 of the third signal injection point 213. When the signal generating unit 10 sends a detection signal to the first signal injection point 211, the control unit 20 can perform fault detection on the signal generating unit 10 based on the electrical signal output by the first detection point 221. Because the first detection point 221 is connected to the first signal injection point 211, the electrical signal output by the first detection point 221 should be high-level. If the first detection point 221 is low-level, it indicates that the signal generating unit 10 has malfunctioned. When the signal generating unit 10 sends a detection signal to the second signal injection point 212, the control unit 20 can perform fault detection on the signal generating unit 10 based on the electrical signal output by the second detection point 222. When the signal generating unit 10 sends a detection signal to the third signal injection point 213, the control unit 20 can perform fault detection on the signal generating unit 10 based on the electrical signal output by the third detection point 223.

[0067] In the above embodiments, the control unit can also perform fault detection on the signal generation unit based on the electrical signal output by the detection point adjacent to a signal injection point. This can prevent the door lock short circuit detection result from being incorrect due to a fault in the signal generation unit, thereby further improving the accuracy of the door lock short circuit detection result and enhancing the reliability of the elevator anti-accidental movement protection device.

[0068] In some embodiments, as shown in FIG4, the elevator anti-accidental movement protection device 100 further includes: a signal transmission unit 30, the input terminal of the signal transmission unit 30 being adapted to connect to each detection point 220, the output terminal of the signal transmission unit 30 being connected to the control unit 20, and the signal transmission unit 30 being configured to perform voltage transformation on the electrical signal output by each detection point 220 and transmit the voltage-transformed electrical signal to the control unit 20.

[0069] Because the voltage of the electrical signal output by each detection point 220 is too high and exceeds the voltage input range of the control unit 20, directly connecting each detection point 220 to the control unit 20 would damage the control unit 20. Therefore, the signal transmission unit 30 performs voltage conversion on the electrical signal output by each detection point 220. The converted electrical signal can meet the voltage input range of the control unit 20. Then, the signal transmission unit 30 transmits the converted electrical signal to the control unit 20 so that the control unit 20 can perform door lock short-circuit detection based on the converted electrical signal.

[0070] In one alternative embodiment, the signal transmission unit 30 includes a plurality of optocouplers (not shown), the light-emitting part of each optocoupler being adapted to connect to each detection point 220, and the light-receiving part of each optocoupler being connected to the control unit 20.

[0071] Understandably, when the electrical signal output by detection point 220 is high, the light-emitting part of the optocoupler emits light, turning on the light-receiving part of the optocoupler and outputting a high-level signal. The voltage of this high-level signal conforms to the voltage input range of the control unit 20. When the electrical signal output by detection point 220 is low, the light-emitting part of the optocoupler cannot emit light, so the light-receiving part of the optocoupler outputs a low level.

[0072] In the above embodiment, because the electrical signal voltage output by the detection point is relatively high, the electrical signal output by each detection point is voltage-converted and transmitted through the signal transmission unit to meet the voltage input range of the control unit, thereby avoiding damage to the control unit and further improving the reliability of the elevator anti-accidental movement protection device.

[0073] Optionally, when the elevator is in operation, the elevator door lock circuit 200 is adapted to receive a voltage signal so that the control unit 20 can perform fault detection on the signal transmission unit 30 based on the electrical signal transmitted by the signal transmission unit 30.

[0074] When the elevator is in operation, all elevator door locks S are closed; therefore, the elevator door lock circuit 200 is in the open state. The voltage door lock circuit is adapted to input voltage signals; therefore, the electrical signal transmitted by the signal transmission unit 30 should be high-level. If the electrical signal transmitted by the signal transmission unit 30 is low-level, then the signal transmission unit 30 has malfunctioned.

[0075] In this embodiment, when the elevator is in operation, the elevator door lock circuit is in the open state and is suitable for input voltage signals. Therefore, the level of the electrical signal transmitted by the signal transmission unit can be used to determine whether the signal transmission unit has malfunctioned, thereby further improving the reliability of the elevator anti-accidental movement protection device.

[0076] In some embodiments, as shown in FIG5, the elevator anti-accidental movement protection device 100 further includes a door lock bypass circuit 40. One end of the door lock bypass circuit 40 is adapted to be connected to one end of the elevator door lock circuit 200, and the other end of the door lock bypass circuit 40 is adapted to be connected to the other end of the elevator door lock circuit 200. The control unit 20 is also connected to the door lock bypass circuit 40, and the control unit 20 is also configured to control the door lock bypass circuit 40 to disconnect during the door lock short circuit detection process.

[0077] It is understandable that the door lock bypass circuit 40 is connected in parallel with the elevator door lock circuit 200. If the door lock bypass circuit 40 bypasses the elevator door lock circuit 200, it will lead to an incorrect door lock short circuit detection result. Therefore, during the door lock short circuit detection process, the control unit 20 controls the door lock bypass circuit 40 to remain in the open state, thereby solving the problem that the door lock short circuit detection requires multiple component couplings, which leads to a more complex system design.

[0078] In some embodiments, the control unit 20 is adapted to communicate with the elevator controller 300 to send the door lock short circuit detection result to the elevator controller 300.

[0079] In other words, the elevator controller 300 sends a door lock short-circuit detection enable signal to the control unit 20, the control unit 20 performs a door lock short-circuit detection, and then reports the door lock short-circuit detection result to the elevator controller 300.

[0080] The technical solution of this application will be further described in detail below with reference to specific implementation methods:

[0081] When using the elevator anti-accidental movement protection device shown in Figure 3, as shown in Figure 6, the door lock short-circuit detection method includes the following steps:

[0082] S101, the control unit waits for the door lock short-circuit detection enable signal.

[0083] S102, determine whether the front door lock short circuit detection flag is valid. If the front door lock short circuit detection flag is valid, proceed to step S103. If the front door lock short circuit detection flag is invalid, proceed to step S110.

[0084] S103, determine whether the electrical signal output from the input terminal of the front door lock is low level. If the electrical signal output from the input terminal of the front door lock is low level, proceed to step S119. If the electrical signal output from the input terminal of the front door lock is high level, proceed to step S104.

[0085] S104, determine whether the input terminal of the front door lock is short-circuited with the first detection point, the second detection point, the third detection point, and the fourth detection point. If the input terminal of the front door lock is not short-circuited with the first detection point, the second detection point, the third detection point, and the fourth detection point, then proceed to step S105. If the input terminal of the front door lock is short-circuited with at least one of the first detection point, the second detection point, the third detection point, and the fourth detection point, then proceed to step S119.

[0086] S105, the control signal generation unit sends a detection signal to the first signal injection point, wherein the remaining signal injection points are at a low level.

[0087] S106, determine whether the first detection point is short-circuited with the second, third and fourth detection points. If the first detection point is not short-circuited with the second, third and fourth detection points, proceed to step S107. If the first detection point is short-circuited with at least one of the second, third and fourth detection points, proceed to step S119.

[0088] S107, Clear the front door lock short circuit detection flag.

[0089] S108, determine whether the short-circuit detection flag of the rear door lock is valid. If the short-circuit detection flag of the rear door lock is valid, proceed to step S111. If the short-circuit detection flag of the rear door lock is invalid, proceed to step S109.

[0090] S109, Door lock short circuit test complete.

[0091] S110, determine whether the short-circuit detection flag of the rear door lock is valid. If the short-circuit detection flag of the rear door lock is valid, proceed to step S111. If the short-circuit detection flag of the rear door lock is invalid, return to step S101.

[0092] S111, determine whether the electrical signal output by the second detection point is low level. If the electrical signal output by the second detection point is low level, then execute step S112. If the electrical signal output by the input terminal of the front door lock is high level, then execute step S114.

[0093] S112 outputs the corresponding fault.

[0094] S113, the control signal generation unit sends a detection signal to the second signal injection point, wherein the remaining signal injection points are at a low level.

[0095] S114, determine whether the second signal injection point is short-circuited with the third and fourth detection points. If the second signal injection point is not short-circuited with the third and fourth detection points, proceed to step S115. If the second signal injection point is short-circuited with at least one of the third and fourth detection points, proceed to step S119.

[0096] S115, the control signal generation unit sends a detection signal to the third signal injection point, wherein the remaining signal injection points are at a low level.

[0097] S116, determine whether the third signal injection point and the fourth detection point are short-circuited. If the third signal injection point and the fourth detection point are not short-circuited, proceed to step S116. If the third signal injection point and the fourth detection point are short-circuited, proceed to step S119.

[0098] S117, Clear the short circuit detection flag of the rear door lock.

[0099] S118, determine whether the front door lock short circuit detection flag is valid. If the front door lock short circuit detection flag is valid, proceed to step S103. If the front door lock short circuit detection flag is invalid, proceed to step S109.

[0100] S119 outputs the corresponding fault.

[0101] In the above embodiments, by sending detection signals to the signal injection point in a time-division manner and performing door lock short-circuit detection based on the electrical signals output from the detection point, door lock short-circuit detection can be achieved without adding a safety relay, reducing the hardware cost of the elevator. Furthermore, the signal generation unit is integrated inside the elevator's anti-accidental movement protection device, simplifying circuit design and wiring, making the system more compact. Moreover, since the detection signal is sent in a time-division manner according to the detection process, the waveform of the detection signal can remain unchanged. Therefore, the signal transmission unit only needs to design one signal source, further simplifying the circuit design.

[0102] In summary, the elevator anti-accidental movement protection device according to the embodiments of this disclosure includes: a signal generating unit and a control unit. The signal generating unit is adapted to connect to each signal injection point in the elevator door lock circuit. The control unit is configured to, upon receiving a door lock short-circuit detection enable signal sent by the elevator controller, control the signal generating unit to send a detection signal to the corresponding signal injection point, and perform door lock short-circuit detection based on the electrical signal output by the corresponding detection point. Therefore, the elevator anti-accidental movement protection device internally incorporates a signal generating unit. By sending a detection signal to the elevator door lock circuit and performing door lock short-circuit detection based on the electrical signal output by the detection point, there is no need to add a safety relay, reducing elevator costs. Furthermore, the integration of the signal generating unit and the control unit within the elevator anti-accidental movement protection device simplifies circuit design and wiring, making the system more compact.

[0103] Corresponding to the above embodiments, this disclosure also provides an elevator. As shown in FIG1, the elevator includes: an elevator door lock circuit 200, an elevator controller 300, and an elevator anti-accidental movement protection device 100 of any of the foregoing embodiments.

[0104] The elevator door lock circuit 200 includes multiple elevator door locks S connected in series; the elevator controller 200 is adapted to send a door lock short-circuit detection enable signal; the elevator anti-accidental movement protection device 100 is connected to the elevator door lock circuit 200, and the elevator anti-accidental movement protection device 100 is configured to send a detection signal to the elevator door lock circuit 200 when it receives the door lock short-circuit detection enable signal, and perform door lock short-circuit detection according to the electrical signal output by the elevator door lock circuit 200.

[0105] According to the elevator of the present disclosure embodiment, by adopting the above-described elevator anti-accidental movement protection device, the safety relay is not required to participate in the detection. Therefore, the cost of door lock short circuit detection is low. Furthermore, the signal generation unit is integrated inside the elevator anti-accidental movement protection device, so the door lock circuit can be detected by the elevator anti-accidental movement protection device, which simplifies the circuit design and wiring and makes the system more compact.

[0106] Corresponding to the above embodiments, this disclosure also provides an elevator door lock short-circuit detection method, applied to an elevator anti-accidental movement protection device 100 as shown in FIG1. ​​The elevator anti-accidental movement protection device 100 includes a signal generating unit 10, which is adapted to connect to each signal injection point 210 in the elevator door lock circuit 200. The elevator door lock circuit 200 includes multiple elevator door locks S connected in series, and each signal injection point 210 is located between two adjacent elevator door locks S. As shown in FIG7, the elevator door lock short-circuit detection method includes:

[0107] S201, upon receiving a door lock short-circuit detection enable signal from the elevator controller, the control signal generation unit sends a detection signal to the corresponding signal injection point.

[0108] The elevator includes a front door and a rear door, each with its own door lock. After the front door is fully open, its lock should be in the open position; similarly, after the rear door is fully open, its lock should be in the open position. Therefore, a short-circuit test of the door locks is required after the front door and / or the elevator door is fully open to determine if there is a malfunction. After confirming that the front door and / or the elevator door is fully open, the elevator controller sends a short-circuit test enable signal to the elevator's anti-accidental movement protection device. During the short-circuit test, the elevator door locks should remain open for both the front and / or rear doors. This is because if the elevator door locks are closed when the elevator door is closed, it will affect the short-circuit test results, leading to errors.

[0109] S202, perform door lock short-circuit detection based on the electrical signal output from the corresponding detection point, wherein each detection point is set at the signal output terminal of each elevator door lock.

[0110] Upon receiving a door lock short-circuit detection enable signal from the elevator controller, the control signal generation unit sends a detection signal to the corresponding signal injection point. Then, it determines whether the door lock is short-circuited based on the electrical signal output by the corresponding detection point. If the electrical signal output by the corresponding detection point is the same as the detection signal, a short circuit occurs between the corresponding signal injection point and the corresponding detection point. If the electrical signal output by the corresponding detection point is different from the detection signal, there is no short circuit between the corresponding signal injection point and the corresponding detection point.

[0111] In the above embodiments, by sending a detection signal to the elevator door lock circuit and performing door lock short-circuit detection based on the electrical signal output from the detection point, door lock short-circuit detection can be achieved without adding a safety relay, reducing the hardware cost of the elevator. Furthermore, the elevator anti-accidental movement protection device has an internal signal generation unit, simplifying circuit design and wiring, making the system more compact, and reducing delays and interference during detection signal transmission, thereby improving system reliability. Moreover, the door lock short-circuit detection performed by the elevator anti-accidental movement protection device can effectively reduce the computational burden on the elevator controller, thereby improving the performance and efficiency of the motor main control board.

[0112] In some embodiments, when the front door of the elevator is in the open position, the front door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid; and / or when the rear door of the elevator is in the open position, the rear door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid.

[0113] The door lock short-circuit detection enable signal includes a front door lock short-circuit detection flag and a rear door lock short-circuit detection flag. Sensors are installed on both the front and rear doors to detect whether they are fully open and send the results to the elevator controller. When the elevator controller receives a front door open-to-position signal, it generates a front door lock short-circuit detection flag; therefore, the front door lock short-circuit detection flag is valid. Similarly, when the elevator controller receives a rear door open-to-position signal, it generates a rear door lock short-circuit detection flag; therefore, the rear door lock short-circuit detection flag is valid. Both the front and rear door lock short-circuit detection flags are valid when both doors are fully open.

[0114] It should be noted that when the short-circuit detection flags for both the front and rear door locks are valid, the short-circuit detection for the front door locks should be performed first, followed by the short-circuit detection for the rear door locks.

[0115] In an optional implementation, the signal injection point further includes an input terminal of the front door lock, adapted to input a safety circuit signal, and the method further includes: when the front door lock short-circuit detection flag is valid and the safety circuit signal is high, performing a short-circuit detection on the front door lock based on the electrical signal output by each detection point.

[0116] The elevator door locks connected in series include the front car door lock, the front landing door lock, the rear car door lock, and the rear landing door lock. The front door lock corresponds to the front car door lock S1 in Figure 2. If the safety circuit signal is low, the safety circuit signal is faulty. When the safety circuit signal is faulty, it will affect the short-circuit detection result. Therefore, when the safety circuit signal is faulty, the door lock short-circuit detection will not continue. If the safety circuit signal is high, the safety circuit signal is normal, and the short-circuit detection can continue. The short-circuit detection is performed based on the safety circuit signal and the electrical signal output by each detection point. If the electrical signal output by a certain detection point is high, a short circuit occurs between that detection point and the input terminal of the front door lock.

[0117] In some embodiments, the method further includes: performing fault detection on the safety circuit signal based on the electrical signal output from the input terminal of the front door lock.

[0118] Understandably, since the input terminal of the front door lock is the injection point for the safety circuit signal, the safety circuit signal malfunction can be determined based on the level of the front door lock's input terminal. When the front door lock's input terminal is low, the safety circuit fault signal is low; when the front door lock's input terminal is high, the safety circuit fault signal is high.

[0119] In another optional implementation, after the front door lock short circuit detection is completed, the method further includes: clearing the front door lock short circuit detection flag.

[0120] In another alternative implementation, the signal injection point further includes the input terminal of the rear door lock, which is suitable for inputting a safety circuit signal. The method further includes: when the short-circuit detection flag of the rear door lock is valid and the safety circuit signal is high, performing a short-circuit detection on the rear door lock based on the electrical signal output from the detection point set behind the rear door lock.

[0121] The rear door lock corresponds to the rear car door lock S3 in Figure 2. When the front door lock does not require short-circuit testing, the elevator front door is in the closed state. Therefore, the front car door lock and the front landing door lock are in the closed state, and the safety circuit signal is input to the input terminal of the rear car door lock through the front car door lock and the front landing door lock. Therefore, the input terminal of the rear car door lock is the injection point of the safety circuit signal. When the safety circuit signal is high, the rear door lock can be directly short-circuited tested based on the safety circuit signal and the electrical signal output from the detection point set after the rear door lock.

[0122] In some embodiments, the method further includes: when the safety circuit signal is low, the control signal generating unit sends a detection signal to the input terminal of the rear door lock, and performs short-circuit detection on the rear door lock according to the electrical signal output by the detection point set behind the rear door lock.

[0123] Because the input terminal of the rear door lock is suitable for inputting safety circuit signals, it is possible to determine whether the safety circuit signal has failed based on the electrical signal output from the input terminal of the rear door lock. If the safety circuit signal fails, the control signal generating unit sends a detection signal to the input terminal of the rear door lock, and then performs a short-circuit detection on the rear door lock based on the detection signal and the electrical signal output from the detection point set behind the rear door lock.

[0124] Similarly, after the short circuit test of the rear door lock is completed, the method also includes: clearing the short circuit test flag of the rear door lock.

[0125] In the above embodiments, by setting the front door lock short circuit detection flag and the rear door lock short circuit detection flag in the door lock short circuit detection enable signal, short circuit detection can be performed on the front door lock and the rear door lock respectively, thereby generating more accurate fault diagnosis information and helping to quickly eliminate faults.

[0126] In some embodiments, the control signal generating unit sends a detection signal to the corresponding signal injection point, including: the control signal generating unit sequentially sends the same detection signal to the signal injection point.

[0127] In other words, sending detection signals to multiple signal injection points simultaneously could lead to errors in the door lock short-circuit detection results. Therefore, the signal generation unit uses a time-division multiplexing method, sending the same detection signal to each signal injection point sequentially. This way, during each short-circuit detection process, the control signal generation unit sends a detection signal to only one signal injection point, while the remaining signal injection points do not receive the detection signal and remain at a low level. Because only one signal injection point receives the detection signal at a time, the detection signal of the signal generation unit can remain unchanged.

[0128] In an optional implementation, the method further includes: inputting a detection signal to a signal injection point and performing fault detection on the signal generation unit based on the corresponding electrical signals output by adjacent detection points.

[0129] Taking Figure 3 as an example, the first detection point 221 is the adjacent detection point 220 of the first signal injection point 211, the second detection point 222 is the adjacent detection point 220 of the second signal injection point 212, and the third detection point 223 is the adjacent detection point 220 of the third signal injection point 213. When the signal generating unit 10 sends a detection signal to the first signal injection point 211, the control unit 20 can perform fault detection on the signal generating unit 10 based on the electrical signal output by the first detection point 221. Because the first detection point 221 is connected to the first signal injection point 211, the electrical signal output by the first detection point 221 should be high-level. If the first detection point 221 is low-level, it indicates that the signal generating unit 10 has malfunctioned. When the signal generating unit 10 sends a detection signal to the second signal injection point 212, the control unit 20 can perform fault detection on the signal generating unit 10 based on the electrical signal output by the second detection point 222. When the signal generating unit 10 sends a detection signal to the third signal injection point 213, the control unit 20 can perform fault detection on the signal generating unit 10 based on the electrical signal output by the third detection point 223.

[0130] In the above embodiments, the control unit can also perform fault detection on the signal generation unit based on the electrical signal output by the detection point adjacent to a signal injection point. This can prevent the door lock short circuit detection result from being incorrect due to a fault in the signal generation unit, thereby further improving the accuracy of the door lock short circuit detection result and enhancing the reliability of the elevator anti-accidental movement protection device.

[0131] In some embodiments, as shown in FIG4, the elevator anti-accidental movement protection device 100 further includes a signal transmission unit 30. The input terminal of the signal transmission unit 30 is adapted to connect to each detection point 220. The signal transmission unit 30 is configured to perform voltage transformation on the electrical signal output by each detection point 220 and transmit the voltage-transformed electrical signal. When the elevator is in operation, the elevator door lock circuit is adapted to input a voltage signal. The method further includes: performing fault detection on the signal transmission unit based on the electrical signal transmitted by the signal transmission unit.

[0132] Because the output voltage of the electrical signal from each detection point 220 is too high, exceeding the voltage input range of the control unit 20, directly connecting each detection point 220 to the control unit 20 would damage the control unit 20. Therefore, the signal transmission unit 30 performs voltage conversion on the output electrical signal from each detection point 220. The converted electrical signal meets the voltage input range of the control unit 20. Then, the signal transmission unit 30 transmits the converted electrical signal to the control unit 20 so that the control unit 20 can perform door lock short-circuit detection based on the converted electrical signal. When the elevator is in operation, all elevator door locks are closed; therefore, the elevator door lock circuit is in the open state. The voltage door lock circuit is suitable for input voltage signals; therefore, the electrical signal transmitted by the signal transmission unit should be high-level. If the electrical signal transmitted by the signal transmission unit is low-level, the signal transmission unit has malfunctioned.

[0133] In one alternative embodiment, the signal transmission unit 30 includes a plurality of optocouplers (not shown), the light-emitting part of each optocoupler being adapted to connect to each detection point 220, and the light-receiving part of each optocoupler being connected to the control unit 20.

[0134] Understandably, when the electrical signal output by detection point 220 is high, the light-emitting part of the optocoupler emits light, turning on the light-receiving part of the optocoupler and outputting a high-level signal. The voltage of this high-level signal conforms to the voltage input range of the control unit 20. When the electrical signal output by detection point 220 is low, the light-emitting part of the optocoupler cannot emit light, so the light-receiving part of the optocoupler outputs a low level.

[0135] In the above embodiment, because the electrical signal voltage output by the detection point is relatively high, the electrical signal output by each detection point is voltage-converted and transmitted through the signal transmission unit to meet the voltage input range of the control unit, thereby avoiding damage to the control unit. Furthermore, when the elevator is in operation, the elevator door lock circuit is in the open state and is suitable for input voltage signals. Therefore, the level of the electrical signal transmitted by the signal transmission unit can be used to determine whether the signal transmission unit has malfunctioned, thereby further improving the reliability of the elevator anti-accidental movement protection device.

[0136] In some embodiments, as shown in FIG5, the elevator anti-accidental movement protection device 100 further includes a door lock bypass circuit 40, one end of which is adapted to be connected to one end of the elevator door lock circuit 200, and the other end of which is adapted to be connected to the other end of the elevator door lock circuit 200. The method further includes: controlling the door lock bypass circuit to disconnect during the door lock short circuit detection process.

[0137] It is understandable that the door lock bypass circuit is connected in parallel with the elevator door lock circuit. If the door lock bypass circuit bypasses the elevator door lock circuit, it will lead to an incorrect door lock short circuit detection result. Therefore, during the door lock short circuit detection process, the control unit 20 controls the door lock bypass circuit 40 to remain in the open state, thereby solving the problem that the door lock short circuit detection requires multiple component coupling, which leads to a more complex system design.

[0138] In some embodiments, after performing door lock short-circuit detection based on the electrical signal output from the corresponding detection point, the method further includes: sending the door lock short-circuit detection result to the elevator controller.

[0139] In other words, the elevator controller sends a door lock short-circuit detection enable signal to the control unit, the control unit performs a door lock short-circuit detection, and then reports the door lock short-circuit detection result to the elevator controller.

[0140] In summary, according to the elevator door lock short-circuit detection method of this disclosure, upon receiving a door lock short-circuit detection enable signal sent by the elevator controller, the control signal generating unit sends a detection signal to the corresponding signal injection point and performs door lock short-circuit detection based on the electrical signal output by the corresponding detection point. The signal generating unit is adapted to connect to each signal injection point in the elevator door lock circuit, which includes multiple elevator door locks connected in series. Each signal injection point is located between two adjacent elevator door locks, and each detection point is located at the signal output terminal of each elevator door lock. Therefore, by sending a detection signal to the elevator door lock circuit through the signal generating unit internally installed in the elevator anti-accidental movement protection device and performing door lock short-circuit detection based on the electrical signal output by the detection point, there is no need to add a safety relay, reducing elevator costs. Furthermore, the integration of the signal generating unit and the control unit within the elevator anti-accidental movement protection device simplifies circuit design and wiring, making the system more compact.

[0141] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0142] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0143] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0144] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0145] Furthermore, the terms "first," "second," etc., used in the embodiments of this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this disclosure can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this disclosure, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0146] In this disclosure, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing," etc., appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific implementation.

[0147] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. An elevator anti-accidental movement protection device, comprising: A signal generating unit is adapted to connect to each signal injection point in an elevator door lock circuit, wherein the elevator door lock circuit includes multiple elevator door locks connected in series, and each signal injection point is disposed between two adjacent elevator door locks; A control unit is connected to the signal generating unit and adapted to connect to each detection point in the elevator door lock circuit. The control unit is configured to control the signal generating unit to send a detection signal to the corresponding signal injection point when it receives a door lock short-circuit detection enable signal sent by the elevator controller, and to perform door lock short-circuit detection according to the electrical signal output by the corresponding detection point. Each detection point is located at the signal output terminal of each elevator door lock.

2. The elevator anti-accidental movement protection device according to claim 1, wherein, When the elevator front door is fully open, the front door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid.

3. The elevator anti-accidental movement protection device according to claim 1, wherein, When the elevator rear door is fully open, the rear door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid.

4. The elevator anti-accidental movement protection device according to claim 1, wherein, When both the front and rear doors of the elevator are fully open, the front and rear door lock short-circuit detection flags of the door lock short-circuit detection enable signal are valid.

5. The elevator anti-accidental movement protection device according to claim 2 or 4, wherein, The signal injection point also includes the input terminal of the front door lock, which is suitable for inputting a safety circuit signal. When the front door lock short-circuit detection flag is valid and the safety circuit signal is high, the front door lock is short-circuited according to the electrical signal output by each detection point.

6. The elevator anti-accidental movement protection device according to claim 5, wherein, The control unit is also adapted to connect to the input terminal of the front door lock, and the control unit is further configured to perform fault detection on the safety circuit signal based on the electrical signal output from the input terminal of the front door lock.

7. The elevator anti-accidental movement protection device according to claim 3 or 4, wherein, The signal injection point also includes the input terminal of the rear door lock, which is suitable for inputting a safety circuit signal. When the short-circuit detection flag of the rear door lock is valid and the safety circuit signal is high, the rear door lock is short-circuited for detection according to the electrical signal output by the detection point set after the rear door lock.

8. The elevator anti-accidental movement protection device according to claim 7, wherein, The control unit is also adapted to connect to the input terminal of the rear door lock. The control unit is also configured to control the signal generating unit to send the detection signal to the input terminal of the rear door lock when the safety circuit signal is low, and to perform short-circuit detection on the rear door lock according to the electrical signal output by the detection point set behind the rear door lock.

9. The elevator anti-accidental movement protection device according to any one of claims 1-8, wherein, The signal generating unit sends the same detection signal to the signal injection point sequentially in a time-division manner.

10. The elevator anti-accidental movement protection device according to claim 9, wherein, The control unit is also configured to perform fault detection on the signal generating unit by inputting a detection signal to one of the signal injection points, based on the corresponding electrical signals output by the adjacent detection points.

11. The elevator anti-accidental movement protection device according to any one of claims 1-10, wherein, It also includes: a signal transmission unit, the input terminal of which is adapted to be connected to each of the detection points, the output terminal of which is connected to the control unit, and the signal transmission unit is configured to perform voltage transformation on the electrical signal output by each detection point and transmit the voltage-transformed electrical signal to the control unit.

12. The elevator anti-accidental movement protection device according to any one of claims 1-11, wherein, It also includes a door lock bypass circuit, one end of which is adapted to be connected to one end of the elevator door lock circuit, and the other end of which is adapted to be connected to the other end of the elevator door lock circuit. The control unit is also connected to the door lock bypass circuit and is further configured to control the door lock bypass circuit to disconnect during the door lock short circuit detection process.

13. The elevator anti-accidental movement protection device according to any one of claims 1-12, wherein, The control unit is adapted to communicate with the elevator controller to send the door lock short circuit detection result to the elevator controller.

14. An elevator, comprising: An elevator door lock circuit, comprising multiple elevator door locks connected in series; An elevator controller, the elevator controller being adapted to send a door lock short-circuit detection enable signal; According to any one of claims 1-13, the elevator anti-accidental movement protection device is connected to the elevator door lock circuit, and the elevator anti-accidental movement protection device is configured to send a detection signal to the elevator door lock circuit when receiving the door lock short-circuit detection enable signal, and perform door lock short-circuit detection according to the electrical signal output by the elevator door lock circuit.

15. A method for detecting short circuits in an elevator door lock, applied to an elevator anti-accidental movement protection device, wherein the elevator anti-accidental movement protection device includes a signal generation unit adapted to connect to each signal injection point in the elevator door lock circuit, wherein... The elevator door lock circuit includes multiple elevator door locks connected in series, and each signal injection point is located between two adjacent elevator door locks. The method includes: Upon receiving a door lock short-circuit detection enable signal from the elevator controller, the signal generating unit is controlled to send a detection signal to the corresponding signal injection point. The door lock short-circuit test is performed based on the electrical signal output from the corresponding detection point, wherein each detection point is set at the signal output terminal of each elevator door lock.

16. The method according to claim 15, wherein, When the elevator front door is fully open, the front door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid.

17. The method according to claim 15, wherein, When the elevator rear door is fully open, the rear door lock short-circuit detection flag of the door lock short-circuit detection enable signal is valid.

18. The method according to claim 15, wherein, When both the front and rear doors of the elevator are fully open, the front and rear door lock short-circuit detection flags of the door lock short-circuit detection enable signal are valid.

19. The method according to any one of claims 15-18, wherein, Controlling the signal generating unit to send detection signals to the corresponding signal injection points includes: The signal generation unit is controlled to send the same detection signal to the signal injection point in sequence.

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