Safety tongs unlocking method and related device
By applying positive and negative torques and zero torque intervals in the elevator's safe state, combined with five-segment space vector pulse width modulation and low carrier frequency control, the problem of motor overload during elevator safety clamp unlocking is solved, achieving stable unlocking of the safety clamp and stable operation of the elevator system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENZHEN HPMONT TECH
- Filing Date
- 2026-04-17
- Publication Date
- 2026-05-19
AI Technical Summary
When the elevator safety brake is forcibly unlocked after being triggered, it may cause the motor to output excessive torque, resulting in a huge current surge and causing the elevator system to malfunction.
By periodically applying positive and negative torques and setting zero torque intervals while the elevator is in a safe state, and using five-segment space vector pulse width modulation and low carrier frequency to control the motor, abnormal signals are shielded, ensuring the stability of the safety clamp unlocking process.
The reduced motor output power prevented elevator system overload and malfunction, ensuring the safety clamp could be unlocked smoothly.
Smart Images
Figure CN122059313A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of elevator control technology, and in particular to a safety clamp unlocking method and related device. Background Technology
[0002] During elevator operation, safety issues such as overspeeding or falling may occur due to various reasons. To ensure the safety of passengers in the event of such malfunctions, elevators are usually equipped with safety brakes. When the elevator speed governor detects a falling malfunction, the safety brakes are triggered and clamp the speed governor rope, thereby generating a huge friction force on the guide rails, which steadily stops the car and firmly holds it in place, thus preventing the elevator from falling further.
[0003] When the elevator needs to resume normal operation after the safety clamp is triggered (i.e., when the safety clamp needs to be reset and unlocked), maintenance personnel often directly drive the motor to force the elevator to run in order to reset and unlock the safety clamp. In this unlocking method, if the safety clamp has been severely deformed and its clamping force is too large, or if the direction of the torque applied to the safety clamp by the elevator running direction is incorrect, forcibly unlocking the safety clamp can easily lead to excessive motor output torque (output power), thereby generating a huge current surge and causing the elevator system to malfunction. Summary of the Invention
[0004] In view of the above problems, this application provides a safety clamp unlocking method and related equipment to safely unlock elevator safety clamps. The specific solution is as follows:
[0005] The first aspect of this application provides a method for unlocking a security clamp, comprising:
[0006] After receiving the elevator's safety clamp unlocking command, it checks whether the elevator meets the safety condition for safety clamp unlocking;
[0007] If the elevator is in the safe state, a first torque with a duration of a first time, a second torque with a duration of a second time, and a third torque with a duration of a third time are periodically applied to the safety clamp in sequence, wherein the first torque and the second torque are in opposite directions, the third torque is zero, and the first time, the second time, and the third time constitute a time period;
[0008] When the elevator is in the safe state, the elevator's operating status is monitored. If a change in the elevator's operating status is detected, the safe state is exited, and a message is displayed indicating that the safety clamp has been successfully unlocked.
[0009] Furthermore, detecting whether the elevator meets the safety condition for unlocking the safety clamp includes:
[0010] Based on one or more of the following: elevator control system status, elevator drive system temperature, safety circuit status, door lock circuit status, maintenance operation status, and maintenance command status, the system detects whether the elevator meets the safety condition of unlocking the safety clamp.
[0011] Furthermore, if the elevator is in the safe state, then periodically applying a first torque for a first duration, a second torque for a second duration, and a third torque for a third duration to the safety clamp in sequence includes:
[0012] If the elevator is in the safe state, the elevator drive motor is driven by a five-segment space vector pulse width modulation drive mode to periodically apply a first torque with a duration of a first time, a second torque with a duration of a second time, and a third torque with a duration of a third time to the safety clamp in sequence.
[0013] Furthermore, the safety clamp unlocking method also includes:
[0014] After the elevator is in the safe state, the type of the elevator's drive motor is obtained. If the drive motor type is an asynchronous motor, a pulse width modulation signal is generated based on the preset magnetic pole angle sequence of the asynchronous motor, the first torque, and the second torque to drive the asynchronous motor. This drives the asynchronous motor to periodically apply a first torque with a duration of a first time, a second torque with a duration of a second time, and a third torque with a duration of a third time to the safety clamp in sequence. The magnetic pole angles in the magnetic pole angle sequence are uniformly distributed between 0° and 360°.
[0015] Furthermore, the safety clamp unlocking method also includes:
[0016] When the elevator is in the safe state, the carrier frequency of the inverter corresponding to the elevator is switched from the normal operating frequency to the low load operating frequency.
[0017] Furthermore, the safety clamp unlocking method also includes:
[0018] When the elevator is in the safe state, the inverter's cooling fan switches from the normal operating frequency to the high-frequency operating frequency.
[0019] Furthermore, when the elevator is in the aforementioned safe state, the following additional features are also included:
[0020] The shielded elevator detection overcurrent signal, the elevator encoder disconnection signal, and the motor running speed signal are one or more of these signals.
[0021] A second aspect of this application provides a safety clamp unlocking system, comprising:
[0022] The detection unit is used to detect whether the elevator meets the safety clamp unlocking safety status after receiving the elevator safety clamp unlocking command;
[0023] The control unit is configured to periodically apply a first torque for a first time duration, a second torque for a second time duration, and a third torque for a third time duration to the safety clamp when the elevator is in the safe state, wherein the first torque and the second torque have opposite torque directions, the third torque is zero torque, and the first time, the second time, and the third time constitute one time period;
[0024] The monitoring unit is used to monitor the operating status of the elevator when the elevator is in the safe state. If a change in the operating status of the elevator is detected, the unit exits the safe state and prompts that the safety clamp has been successfully unlocked.
[0025] A third aspect of this application provides a safety clamp unlocking device, comprising:
[0026] Central processing unit, memory, input / output interfaces, wired or wireless network interfaces, and power supply;
[0027] The memory is either a short-term storage memory or a persistent storage memory;
[0028] The central processing unit is configured to communicate with the memory and execute instructions in the memory to perform the security clamp unlocking method of the first aspect or any implementation thereof.
[0029] A fourth aspect of this application provides a computer-readable storage medium carrying one or more computer programs that, when executed by an electronic device, enable the electronic device to implement the security clamp unlocking method described in the first aspect or any implementation thereof.
[0030] By employing the above technical solution, the safety clamp unlocking method provided in this application can, under the safe condition of unlocking the safety clamp, periodically apply positive and negative torques to the safety clamp to loosen the originally clamped safety clamp, thereby unlocking the safety clamp with a lower torque. This allows the motor to unlock the safety clamp with a lower output power. Furthermore, a third time interval, i.e., a zero torque application time, is set in the cycle of applying positive and negative torques to the motor, thereby further reducing the output power of the motor, frequency converter, and other related equipment, so as to avoid overload of related equipment during the application of torque and reduce the occurrence of large currents that could cause elevator system failures. Attached Figure Description
[0031] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.
[0032] Figure 1 A flowchart of a safety clamp unlocking method provided in this application;
[0033] Figure 2 This is a structural schematic diagram of a safety clamp unlocking device provided in this application. Detailed Implementation
[0034] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.
[0035] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.
[0036] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.
[0037] During elevator operation, safety issues such as overspeeding or falling may occur due to various reasons. To ensure the safety of passengers in the event of such malfunctions, elevators are usually equipped with safety brakes. When the elevator speed governor detects a falling malfunction, the safety brakes are triggered and clamp the speed governor rope, thereby generating a huge friction force on the guide rails, which steadily stops the car and firmly holds it in place, thus preventing the elevator from falling further.
[0038] When the elevator needs to resume normal operation after the safety clamp is triggered (i.e., when the safety clamp needs to be reset and unlocked), maintenance personnel often directly drive the motor to force the elevator to run in order to reset and unlock the safety clamp. For example, they can directly control the motor to continuously increase the output power from the direction of operation of a certain elevator (the elevator going up or down), so that the torque applied to the safety clamp gradually increases, thereby reaching the torque required for the safety clamp to reset and unlock, and thus forcibly resetting and unlocking the safety clamp.
[0039] In this unlocking method, when controlling the elevator to forcibly unlock the safety clamp, if the safety clamp has undergone severe deformation and its clamping force is too large, or if the direction of the torque applied to the safety clamp by the elevator's running direction is incorrect, forcibly unlocking the safety clamp can easily lead to excessive motor output torque (output power), thereby generating a huge current surge and causing the elevator system to malfunction. In view of this, embodiments of this application provide a safety clamp unlocking method and related apparatus.
[0040] like Figure 1 As shown in the figure, this application embodiment provides a method for unlocking a security clamp, the method comprising the following steps:
[0041] 101. After receiving the elevator's safety brake unlocking command, check whether the elevator meets the safety condition for safety brake unlocking;
[0042] After the safety clamp is triggered, the elevator car is locked, and the elevator's operating state will differ from its normal operating state. For example, the elevator's operating speed, control torque, and control conditions will all be different. To avoid control logic conflicts, it is necessary to ensure that the elevator meets certain operating conditions when unlocking the safety clamp, so that it is in a safe state when the safety clamp is unlocked.
[0043] 102. If the elevator is in a safe state, the safety clamp is periodically subjected to a first torque with a duration of a first time, a second torque with a duration of a second time, and a third torque with a duration of a third time. The first torque and the second torque are in opposite directions, the third torque is zero, and the first time, the second time and the third time constitute one time period.
[0044] After ensuring the elevator is in a safe state, the safety brake is often locked to the guide rail after being triggered to suspend the car. During this process, the safety brake is often subjected to a huge impact, causing deformation. Different deformations correspond to different unlocking torque requirements. Therefore, a first torque and a second torque (positive and negative torques) can be applied periodically from different directions. When applying positive and negative torques, the deformed and locked safety brake will gradually loosen and sway under the different positive and negative torques. Under the continuous periodic positive and negative torques (where the applied first torque and second torque can be different values in different cycles, such as the first torque value in the first cycle being 100 and the first torque value in the second cycle being 200), it is ensured that the safety brake can gradually loosen under the action of torque until it unlocks. In addition, after applying the first torque and the second torque in one cycle, in order to avoid motor overload, a time is reserved for applying a third torque (zero torque) to provide heat dissipation time for the motor. Based on the actual operating conditions, this third torque can also be a small torque to ensure that the motor does not need to start and stop frequently.
[0045] 103. When the elevator is in a safe state, monitor the elevator's operating status. If a change in the elevator's operating status is detected, exit the safe state and indicate that the safety brake has been successfully unlocked.
[0046] The tightness of the safety clamp is negatively correlated with the elevator's operating speed (the tighter the safety clamp is, the slower the elevator will run under the same torque). When the elevator is in a safe state, the safety clamp is continuously subjected to a periodic positive and negative torque. If the applied torque reaches the torque required for the safety clamp to unlock, the elevator will change from its original clamped state (i.e., stationary state, such as when the elevator's operating speed is too low, like 0.001m / s, it can also be considered stationary) to a moving state. If the change in the elevator's moving state is detected, it means that the safety clamp has been successfully unlocked, and a notification will be displayed indicating that the safety clamp has been successfully unlocked.
[0047] By employing the above methods and steps, it can be ensured that when the elevator is in a safe state, positive and negative torques (i.e., the first torque and the second torque) are periodically applied to the safety clamp. These first and second torques gradually increase with each cycle, causing the originally clamped safety clamp to loosen. This allows the safety clamp to be unlocked with a lower torque, enabling the motor to unlock the safety clamp with a smaller output power. Furthermore, a third time interval, i.e., a zero torque application time, is set within the cycle of applying positive and negative torques to further reduce the motor's output power. This helps to avoid overload during the application of torque by the motor and reduces the occurrence of large currents generated by the motor that could lead to elevator system malfunctions.
[0048] In some embodiments of this application, after receiving the elevator safety clamp unlocking command, it is necessary to check whether the elevator meets the safety condition for safety clamp unlocking. Since the elevator safety clamp has been triggered and the elevator car is in a locked state, to ensure a safe state during safety clamp unlocking, certain operating conditions must be met. For example, operating condition 1: Check whether the elevator control system is in a fault-free state to ensure no other faults interfere with the elevator system when unlocking the safety clamp; operating condition 2: Check whether the elevator drive system temperature is within a safe temperature range. Since the torque applied during safety clamp unlocking is often greater than the torque during normal operation, the elevator drive system is prone to overheating. Therefore, it is necessary to monitor the elevator drive temperature in real time to ensure it is within a safe temperature range (specifically, by monitoring the radiator temperature in the inverter corresponding to the drive motor, ensuring the radiator temperature is below 60°C); operating condition 3: Check whether the elevator system's safety circuit and door lock circuit are closed. During elevator control, confirming the closure of the safety circuit and door lock circuit confirms that the relevant elevator doors are closed, preventing elevator operation when the doors are not closed. If operating condition 4 is met: Check if the elevator is in maintenance mode. In maintenance mode, the elevator's speed is limited to a preset detection speed to prevent it from running at a safe speed during maintenance. If operating condition 5 is met: Check if the elevator's maintenance commands are valid, such as whether the elevator's upward or downward maintenance commands are valid (i.e., whether the commands to apply torque to control the elevator's upward or downward movement are valid), ensuring that all relevant signals are accurate and valid throughout the safety clamp unlocking process. Only after ensuring that all the above operating conditions are met, or at least some of the required operating conditions are met based on the actual situation, can the elevator be confirmed to be in a safe state to achieve safe unlocking of the safety clamp. If a required condition is not met during the process of applying torque to unlock the safety clamp, the safe state must be exited and the application of torque to the safety clamp must be stopped.
[0049] By checking the above operating conditions to confirm the safety status, it can be ensured that the entire elevator system is in a safe and stable state during the safety clamp unlocking process, avoiding other malfunctions that may affect the safety of the entire safety clamp unlocking process.
[0050] In some embodiments of this application, since the elevator system mainly sends the corresponding pulse width modulation (i.e., PWM) to the motor through the frequency converter to control the torque required by the motor output, when the safety clamp is unlocked after confirming that the elevator is in a safe state, the applied torque is often greater than the torque when the elevator system is running normally. Therefore, in order to avoid equipment overload as much as possible during the unlocking process of the safety clamp, it is necessary to select an appropriate driving method based on the actual situation to periodically apply a first torque M1 with a duration of a first time T1, a second torque M2 with a duration of a second time T2, and a third torque M3 with a duration of a third time T3 to the safety clamp in sequence.
[0051] In some embodiments of this application, in order to avoid overload of related equipment (such as frequency converters, drive motors, etc.) as much as possible, the frequency converter can use a five-segment space vector pulse width modulation (i.e., SVPWM) driving mode to control the motor drive, so as to periodically apply a first torque M1 with a duration of a first time T1, a second torque M2 with a duration of a second time T2, and a third torque M3 with a duration of a third time T3 to the safety clamp in sequence.
[0052] In elevator drive control, the frequency converter outputs corresponding commands to the motor through the switching control of the three-phase bridge arms to make the motor output torque. In order to achieve stable control, the motor generally adopts a seven-segment space vector pulse width modulation (i.e., SVPWM modulation) drive method to control the motor drive. The PWM waveform output by the seven-segment space vector pulse width modulation is a continuous and stable waveform. However, all three phase bridge arms in the frequency converter need to operate, and its switching frequency is high, generating a lot of heat. This application adopts a five-segment space vector pulse width modulation. The PWM waveform output by the five-segment space vector pulse width modulation is a discontinuous waveform. Only two phases of the three-phase bridge arms in the frequency converter need to operate. Its switching frequency is low, generating less heat. During the process of applying torque for safety clamp unlocking, the stability requirement of control torque is low. The waveform output by the five-segment space vector pulse width modulation can further reduce the heat generated by the frequency converter while meeting the torque output requirements, avoiding overheating problems during the safety clamp unlocking process.
[0053] Furthermore, in some embodiments of this application, a corresponding driving mode is set according to the type of motor to output a first torque, a second torque, and a third torque. For example, if the elevator's drive motor is an asynchronous motor, the switching action of each bridge arm of the inverter is closely related to the motor's flux linkage angle (or the voltage vector angle in slip frequency control) when controlling the asynchronous motor. Unlike synchronous motors, the rotor and stator of an asynchronous motor rotate asynchronously, so an additional dynamically changing reference angle (such as the magnetic pole angle obtained through a flux linkage observer) needs to be introduced to participate in the control. To ensure that the switching action of each bridge arm of the inverter is as uniform as possible and to avoid local overheating caused by a certain power switching device bearing excessive current for a long time, the inverter can use a set of preset, evenly distributed magnetic pole angle sequences (e.g., 30°, 60°, 90°...360°) when controlling the asynchronous motor, and combine them with the torque requirements of the first torque, second torque, and third torque to generate corresponding pulse width modulation signals, thereby controlling the asynchronous motor to output the corresponding torque.
[0054] By generating pulse waveforms based on a preset magnetic pole angle sequence, the power switching devices of each phase bridge arm of the frequency converter can bear the current evenly during the periodic output torque process, avoiding the problem of overheating of a certain device due to long-term use of a specific magnetic pole angle, thereby further reducing the risk of equipment overheating.
[0055] Furthermore, in some embodiments of this application, when the inverter controls the motor to output torque to unlock the safety clamp, since the torque is applied to the safety clamp periodically, and in some embodiments the magnitude of the torque increases with the increase of the period, and the applied first torque and second torque are opposite (requiring additional control of the motor to switch between forward and reverse rotation), the heat dissipation requirements of the equipment are relatively high. Therefore, to further reduce the risk of equipment overload, when the elevator is in a safe state (i.e., when torque is applied to the safety clamp), the carrier frequency of the inverter can be switched from the normal operating frequency to a low-load operating frequency (e.g., the carrier frequency is switched from the normally controlled 10kHz). (Switching to 1kHz), the carrier frequency corresponds to the number of switching operations of the three-phase bridge arm of the inverter. The higher the carrier frequency, the smoother and more stable the control waveform output by the inverter to the drive motor, and the lower the noise. However, the corresponding switching losses will also increase, and the inverter is prone to overheating. During the unlocking process of the safety clamp, the requirements for heat dissipation are high, while the requirements for noise and control waveform are low. Therefore, using the normal operating frequency as the carrier frequency of the inverter can easily lead to overheating. In this application, the carrier frequency of the inverter is switched from the normal operating frequency to the low-load operating frequency when the safety clamp is unlocked, which can further reduce the risk of inverter overheating, while also meeting the torque requirements for unlocking the safety clamp.
[0056] Furthermore, in some embodiments of this application, the normal operating mode of the inverter's cooling fan is temperature-controlled. When the temperature feedback increases, the operating frequency is increased; when the temperature feedback decreases, the operating frequency is decreased. The cooling fan operates within a relatively suitable normal frequency range. However, in the process of applying torque in this application, the motor output torque is periodically and continuously controlled, and the first and second applied torques are opposite (requiring additional control of the motor rotation direction switching, such as switching between forward and reverse rotation). The normal operating frequency of the cooling fan is difficult to meet the inverter's heat dissipation requirements, and the temperature feedback will also have a lag. Therefore, in the embodiments of this application, when it is determined that the elevator is in a safe state (i.e., when the safety clamp is unlocked), the cooling fan will be directly controlled to switch from the normal operating frequency to a high-frequency operating frequency to further reduce the risk of inverter overheating.
[0057] In some embodiments of this application, due to the difference in the operating states of related equipment between normal elevator operation and when the elevator is unlocking the safety clamp (e.g., when the elevator is operating normally, the motor rotates normally when the inverter transmits control commands to control the motor, but when the elevator unlocks the safety clamp, the elevator is jammed because the safety clamp has been triggered, and the motor can only output torque when the inverter transmits control commands to control the motor, but because the elevator has no displacement, the motor rotates slowly mechanically. In this case, after the inverter sends a rotation command, the system may detect that the motor is not rotating and mistakenly judge that the motor is jammed, resulting in a false alarm), to ensure that the control logic is not disordered and system false alarms occur due to the difference in states during the safety clamp unlocking process, in some embodiments of this application, when the elevator is in a safe state (when the safety clamp is unlocked), some signals are shielded: such as shielding the elevator detection over... When the elevator outputs torque to unlock the safety clamp, the output torque is usually larger than the torque during normal operation, resulting in a brief surge of current. If the current logic used during normal elevator operation is applied, an overcurrent signal can easily be detected, affecting the unlocking of the safety clamp. Therefore, it is necessary to shield the detected overcurrent signal. Furthermore, in some embodiments of this application, the elevator encoder signal is also shielded. The encoder's function is to provide feedback on the rotor position and speed of the motor. When the safety clamp unlocks, the motor can output torque, but because the elevator is jammed by the safety clamp and cannot run, the motor also has difficulty rotating. At this time, according to the detection logic during normal elevator operation, the encoder signal will not change (i.e., the encoder does not detect motor rotation), and the system may mistakenly judge that the encoder is disconnected. Therefore, it is necessary to shield the encoder disconnection signal to avoid affecting the unlocking of the safety clamp. In some embodiments of this application, the motor's running speed signal is also shielded to avoid frequent false fault signals caused by the motor not moving.
[0058] The aforementioned signal shielding prevents interference from system false alarms when applying torque to the safety clamp to unlock it while the elevator is in a safe state, ensuring stable unlocking of the safety clamp.
[0059] In some embodiments of this application, a safety clamp unlocking system is also provided, comprising:
[0060] The detection unit is used to detect whether the elevator meets the safety condition for unlocking the safety clamp after receiving the elevator's safety clamp unlocking command.
[0061] The control unit is used to periodically apply a first torque for a first time duration, a second torque for a second time duration, and a third torque for a third time duration to the safety gear when the elevator is in a safe state. The first torque and the second torque are in opposite directions, the third torque is zero torque, and the first time, the second time, and the third time constitute one time period.
[0062] The monitoring unit is used to monitor the elevator's operating status when the elevator is in a safe state. If a change in the elevator's operating status is detected, the unit exits the safe state and indicates that the safety brake has been successfully unlocked.
[0063] See Figure 2 This application also provides a safety clamp unlocking device, including:
[0064] Central processing unit 201, power supply 202, wired or wireless network interface 203, input / output interface 204, and memory 205;
[0065] Power supply 202 is used to provide power to safety clamp unlocking device 200, and memory 205 is either short-term storage memory or long-term storage memory;
[0066] The central processing unit 201 can be connected to the elevator's frequency converter via the input / output interface 204. The central processing unit 201 also communicates with the memory 205, thereby implementing the aforementioned safety clamp unlocking method according to the instructions in the memory.
[0067] This application also provides a computer-readable storage medium carrying one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any of the security clamp unlocking methods provided in this application.
[0068] It should also be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. In addition, in the device embodiment drawings provided in this application, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines.
[0069] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware, or it can be implemented by special-purpose hardware including application-specific integrated circuits, special-purpose CPUs, special-purpose memory, special-purpose components, etc. Generally, any function performed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be diverse, such as analog circuits, digital circuits, or special-purpose circuits. However, for this application, software program implementation is more often the preferred implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a computer floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, training equipment, or network device, etc.) to execute the methods described in the various embodiments of this application.
[0070] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product.
[0071] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).
Claims
1. A method for unlocking a safety clamp, characterized in that, include: After receiving the elevator's safety clamp unlocking command, it checks whether the elevator meets the safety condition for safety clamp unlocking; If the elevator is in the safe state, a first torque with a duration of a first time, a second torque with a duration of a second time, and a third torque with a duration of a third time are periodically applied to the safety clamp in sequence, wherein the first torque and the second torque are in opposite directions, the third torque is zero, and the first time, the second time, and the third time constitute a time period; When the elevator is in the safe state, the elevator's operating status is monitored. If a change in the elevator's operating status is detected, the safe state is exited, and a message is displayed indicating that the safety clamp has been successfully unlocked.
2. The safety clamp unlocking method according to claim 1, characterized in that, The detection of whether the elevator meets the safety clamp unlocking safety condition includes: Based on one or more of the following: elevator control system status, elevator drive system temperature, safety circuit status, door lock circuit status, maintenance operation status, and maintenance command status, the system detects whether the elevator meets the safety condition of unlocking the safety clamp.
3. The safety clamp unlocking method according to claim 1, characterized in that, If the elevator is in the safe state, then the safety clamp is periodically and sequentially subjected to a first torque for a first time interval, a second torque for a second time interval, and a third torque for a third time interval, including: If the elevator is in the safe state, the elevator drive motor is driven by a five-segment space vector pulse width modulation drive mode to periodically apply a first torque with a duration of a first time, a second torque with a duration of a second time, and a third torque with a duration of a third time to the safety clamp in sequence.
4. The safety clamp unlocking method according to claim 1, characterized in that, The safety clamp unlocking method also includes: After the elevator is in the safe state, the type of the elevator's drive motor is obtained. If the drive motor type is an asynchronous motor, a pulse width modulation signal is generated based on the preset magnetic pole angle sequence of the asynchronous motor, the first torque, and the second torque to drive the asynchronous motor. This drives the asynchronous motor to periodically apply a first torque with a duration of a first time, a second torque with a duration of a second time, and a third torque with a duration of a third time to the safety clamp in sequence. The magnetic pole angles in the magnetic pole angle sequence are uniformly distributed between 0° and 360°.
5. The safety clamp unlocking method according to claim 1, characterized in that, The safety clamp unlocking method also includes: When the elevator is in the safe state, the carrier frequency of the inverter corresponding to the elevator is switched from the normal operating frequency to the low load operating frequency.
6. The safety clamp unlocking method according to claim 1, characterized in that, The safety clamp unlocking method also includes: When the elevator is in the safe state, the inverter's cooling fan switches from the normal operating frequency to the high-frequency operating frequency.
7. The safety clamp unlocking method according to claim 1, characterized in that, When the elevator is in the safe state, it also includes: The shielded elevator detection overcurrent signal, the elevator encoder disconnection signal, and the motor running speed signal are one or more of these signals.
8. A safety clamp unlocking system, characterized in that, include: The detection unit is used to detect whether the elevator meets the safety clamp unlocking safety status after receiving the elevator safety clamp unlocking command; The control unit is configured to periodically apply a first torque for a first time duration, a second torque for a second time duration, and a third torque for a third time duration to the safety clamp when the elevator is in the safe state, wherein the first torque and the second torque have opposite torque directions, the third torque is zero torque, and the first time, the second time, and the third time constitute one time period; The monitoring unit is used to monitor the operating status of the elevator when the elevator is in the safe state. If a change in the operating status of the elevator is detected, the unit exits the safe state and prompts that the safety clamp has been successfully unlocked.
9. A safety clamp unlocking device, characterized in that, include: Central processing unit, memory, input / output interfaces, wired or wireless network interfaces, and power supply; The memory is either a short-term storage memory or a persistent storage memory; The central processing unit is configured to communicate with the memory and execute instructions in the memory to perform the security clamp unlocking method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes instructions that, when executed on a computer, cause the computer to perform the security clamp unlocking method as described in any one of claims 1 to 7.