Safety gear reset control system, elevator system, and safety gear reset control method

Abstract

The embodiment of the present disclosure relates to the field of elevator control, and provides a safety gear reset control system, an elevator system and a safety gear reset control method. The safety gear reset control system comprises a guide mechanism, a power module and a detection module. The safety gear reset control system is configured to perform n reset steps to control the safety gear to be successfully reset. In each reset step, the power module outputs current for T1 time, and after T1 time, the detection module detects whether the safety gear is successfully reset. When the detection module detects that the safety gear is not successfully reset, the power module stops outputting current, cools for T2 time, and after T2 time, the power module outputs current for T1 time, and after T1 time, the detection module detects whether the safety gear is successfully reset. The reset step is repeated until the detection module detects that the safety gear is successfully reset, and n is a positive integer greater than or equal to 1. The safety gear reset control system provided by the embodiment of the present disclosure is beneficial to improving the safety of the safety gear.

Description

Technical Field

[0001] This disclosure relates to the field of elevator control, and in particular to a safety gear reset control system, an elevator system, and a safety gear reset control method. Background Technology

[0002] In April 2023, the State Administration for Market Regulation formulated and revised new inspection regulations for special equipment. After the transition period, the original regulations are no longer applicable to existing elevator equipment. The new regulations stipulate that an annual inspection of the speed governor-safety gear linkage must be conducted. During this inspection, the elevator car must be loaded with 125% of its rated load capacity and descend at the rated speed (≤4 m / s) to verify the speed governor and safety gear linkage. The speed governor and safety gear must operate reliably. This speed is significantly higher than the speed specified in the original regulations (≤0.25 m / s). Therefore, during the speed governor-safety gear linkage inspection, the safety gear will generate greater friction to stop the elevator car, and a greater driving force is required to reset the safety gear. The elevator car is powered by an electric motor, and a frequency converter is installed between the motor and the power supply. Current frequency converters cannot handle such a large current. When the current output by the frequency converter exceeds its tolerance limit, the frequency converter is easily damaged or even destroyed, which will affect the operation of the entire elevator system.

[0003] Currently, the solutions offered by various manufacturers and installers are to replace existing inverters with lower power margins in their systems with inverters that have higher power limits. This can be achieved by re-selecting inverters based on the torque / current required for safety clamp reset, or by selecting inverters based on the maximum output torque / current of the main unit. However, replacing inverters is expensive, and under normal elevator operating conditions, the replaced inverters have excessive power margins, resulting in redundant functionality and low economic efficiency. Summary of the Invention

[0004] This disclosure provides a safety gear reset control system, an elevator system, and a safety gear reset control method, which at least helps to improve the safety of the safety gear and reduce the risk during the monitoring and inspection of the speed governor-safety gear linkage.

[0005] According to some embodiments of this disclosure, an embodiment of this disclosure provides a safety clamp reset control system for controlling the safety clamp to reset, including a guide mechanism for pulling an elevator car; a power module, one end of which is connected to a power source and the other end of which is connected to the guide mechanism, the power module providing power for the movement of the guide mechanism; and a detection module connected to the safety clamp for detecting whether the safety clamp has been successfully reset; the detection module is also connected to the power module; the safety clamp reset control system is configured to perform n reset steps to control the safety clamp to be successfully reset; in each reset step, the power module outputs current for a duration of T1 time, after which the detection module detects whether the safety clamp has been successfully reset; when the detection module detects that the safety clamp has not been successfully reset, the power module stops outputting current and cools for a duration of T2 time, after which the power module outputs current for a duration of T1 time, after which the detection module detects whether the safety clamp has been successfully reset; the reset steps are repeated until the detection module detects that the safety clamp has been successfully reset, where n is a positive integer greater than or equal to 1.

[0006] In some embodiments, the power module includes: a frequency converter, the input of which is connected to a power source; and a motor, the input of which is connected to the output of the frequency converter, and the motor is connected to a guide mechanism.

[0007] In some embodiments, the frequency converter includes: a control unit, which controls the output current of the frequency converter, and the control unit is also used to detect the output current of the frequency converter and compare the output current value with the warning current value of the frequency converter. When the output current value is equal to the warning current value, the control unit controls the output current of the frequency converter to stop increasing.

[0008] In some embodiments, the frequency converter further includes: a rectifier unit, the input terminal of which is connected to a power supply; an inverter unit, the input terminal of which is connected to the output terminal of the rectifier unit, the output terminal of which is connected to the input terminal of the motor, and the output terminal of the inverter unit serving as the output terminal of the frequency converter; and a control unit connected to the inverter unit, the control unit being used to control the output current of the inverter unit, and the control unit also being used to detect the output current value of the inverter unit.

[0009] In some embodiments, the control unit includes a Hall element disposed on the output line of the frequency converter, and the Hall element is used to detect the current on the output line.

[0010] In some embodiments, the electric motor further includes an encoder for detecting the rotational speed of the electric motor.

[0011] According to some embodiments of this disclosure, another aspect of this disclosure also provides an elevator system, including the safety clamp reset control system described above.

[0012] According to some embodiments of this disclosure, another aspect of this disclosure provides a safety clamp reset control method, including the following: A first reset process begins with a power module providing power to a guide mechanism, which pulls the elevator car upwards. As the elevator car moves upwards, a linkage mechanism drives the safety clamp to reset. The power module provides power for a duration of T1. After T1, a detection module checks whether the safety clamp has successfully reset. If the detection module detects successful reset, the first reset process ends. If the detection module detects unsuccessful reset, a second reset process begins, with the power module providing power to the guide mechanism again after a cooling time of T2, lasting for T1. After T1, the detection module checks again whether the safety clamp has successfully reset. If the detection module detects successful reset, the second reset process ends. If the detection module detects unsuccessful reset, a third reset process begins, with the power module providing power to the guide mechanism again after a cooling time of T2, lasting for T1. This reset process is repeated until the detection module detects successful reset of the safety clamp.

[0013] In some embodiments, the process of the power module providing power to the guide mechanism includes: the inverter is connected to the power supply, the power supply supplies current to the inverter, the inverter supplies current to the motor, and the motor is driven by the current to move the guide mechanism; at the beginning of the first reset process, the control unit of the inverter controls the inverter to output current until a stable value is reached, and when the current is maintained at a stable value, the control unit controls the inverter to output current for a period of time T1; at the beginning of the second reset process, the control unit controls the inverter to stop outputting current and cool for a period of time T2, after time T2, the control unit controls the inverter to output current until a stable value is reached, and when the current is maintained at a stable value, the control unit controls the inverter to output current for a period of time T1; at the beginning of the third reset process, the control unit controls the inverter to stop outputting current and cool for a period of time T2, after time T2, the control unit controls the inverter to output current until a stable value is reached, and when the current is maintained at a stable value, the control unit controls the inverter to output current for a period of time T1; the control unit controls the inverter to repeat the above reset process until the detection module detects that the safety clamp has been successfully reset.

[0014] In some embodiments, the process of the power module providing power to the guide mechanism further includes: after the reset process begins, the control unit detects the output current of the frequency converter and compares the output current with the warning current of the frequency converter; when the output current is equal to the warning current, the control unit controls the output current of the frequency converter to remain unchanged, and the output current at this time is taken as a stable value.

[0015] The technical solution provided in this disclosure has at least the following advantages: The safety gear reset control system provided in this disclosure includes a guide mechanism, a power module, and a detection module, which work together to reset the safety gear. The safety gear reset control system is configured to perform n reset steps until the detection module detects that the safety gear has been successfully reset. In each reset step, the power module outputs current for a duration of T1. After T1, the detection module detects whether the safety gear has been successfully reset. When the detection module detects that the safety gear has not been successfully reset, the power module stops outputting current and cools for a duration of T2 to avoid overload operation of the power module, thereby improving the safety of the safety gear reset control system. After T2, the power module outputs current for a duration of T1. After T1, the detection module detects whether the safety gear has been successfully reset. The safety gear reset control system repeats the above reset steps until the detection module detects that the safety gear has been successfully reset, where n is a positive integer greater than or equal to 1. Through the control of the safety gear reset control system, safety hazards during the safety gear reset process are reduced, and the reset success rate of the safety gear is improved. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figures 1 to 3 Some structural schematic diagrams of the safety clamp reset control system provided in the embodiments of this disclosure;

[0018] Figure 4 A timing diagram of the output current of a frequency converter provided in an embodiment of this disclosure;

[0019] Figure 5 This is a step diagram of a safety clamp reset control method provided in another embodiment of the present disclosure. Detailed Implementation

[0020] As can be seen from the background technology, after the implementation of the new inspection regulations, the operating speed of the elevator car has increased significantly when conducting supervision and inspection of the speed governor-safety gear linkage.

[0021] Analysis revealed that when braking a running elevator car, the wedge-shaped structure in the safety clamp is the main source of friction. After the elevator car stops, the wedge-shaped structure becomes stuck. To restore the motor and car to operation, the safety clamp needs to be reset. The conventional method for resetting the safety clamp is to move the elevator car upwards, releasing the wedge-shaped structure's restriction through the linkage mechanism, thus resetting the safety clamp. However, with the application of the new inspection regulations, the contact of the wedge-shaped structure is tighter, and even the reset actions of different safety clamps in the same elevator car are not synchronized. To reset the safety clamp as a whole, a larger current must be applied to drive the elevator car. The motor supplies power to the elevator car, and a frequency converter is usually installed between the motor and the power supply to control the motor's operating status. However, the original frequency converter cannot withstand the current required for successful reset of the safety clamp, and the frequency converter is prone to overload and burnout, creating a safety hazard.

[0022] Therefore, the safety clamp reset process needs to be optimized to avoid potential safety hazards.

[0023] This disclosure provides a safety clamp reset control system, comprising three main parts: a guiding mechanism, a power module, and a detection module. When the elevator car is stopped by the safety clamp, the safety clamp reset control system is configured to repeat the reset step n times, where n is a positive integer greater than or equal to 1. In each reset step, the power module outputs current to the guiding mechanism to pull the elevator car upwards, and the output current lasts for a duration T1. After T1, the detection module monitors whether the safety clamp has successfully reset. If the detection module detects that the safety clamp has not successfully reset, the power module stops outputting current for cooling, and the elevator car stops moving upwards. After a cooling time T2, the power module outputs current again to pull the elevator car upwards, and the output current lasts for a duration T1. After T1, the detection module again checks whether the safety clamp has successfully reset. The safety clamp reset control system repeats the above reset steps until the detection module detects that the safety clamp has successfully reset. By controlling the action of the power module, the risk of power module overload is avoided, thereby improving the safety of the safety clamp reset process.

[0024] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0025] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0028] In the description of the embodiments of this application, the technical 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 only for the convenience of describing the embodiments of this application 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 the embodiments of this application.

[0029] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0030] Figure 1 This is a schematic diagram of a safety clamp reset control system provided in an embodiment of the present disclosure.

[0031] refer to Figure 1This disclosure provides a safety clamp reset control system 100 for controlling the safety clamp to reset. The safety clamp reset control system 100 includes a guide mechanism 101 for pulling the elevator car 201. The safety clamp reset control system 100 also includes a power module 102, one end of which is connected to a power source 202, and the other end of which is connected to the guide mechanism 101. The power module 102 provides power for the movement of the guide mechanism 101. The safety clamp reset control system 100 also includes a detection module 103 connected to the safety clamp and used to detect whether the safety clamp has successfully reset. The detection module 103 is also connected to the power module 102. The safety clamp reset control system 100 is configured to perform n reset steps to control the safety clamp to successfully reset. In each reset step, the power module 102 outputs current for a duration T1. After time T1, the detection module 103 detects whether the safety clamp has successfully reset. When the detection module 103 detects that the safety clamp has not successfully reset, the power module 102 stops outputting current. After a cooling time T2, the power module 102 resumes outputting current for a duration T1. After T1, the detection module 103 checks again whether the safety clamp has successfully reset. This reset process is repeated until the detection module 103 detects that the safety clamp has successfully reset. n is a positive integer greater than or equal to 1.

[0032] The guiding mechanism 101 transmits the power output from the motor to the elevator car 201. Through the guiding action of the guiding mechanism 101, the elevator car 201 can be pulled upwards or downwards, thus achieving the upward or downward movement of the elevator car 201. During the safety brake reset process, the traction mechanism pulls the elevator car 201 upwards, and the power is transmitted to the safety brake through the linkage mechanism between the elevator car 201 and the safety brake, thereby releasing the safety brake's stopping action.

[0033] In some embodiments, the traction mechanism may include components such as a traction steel wire rope, a guide pulley, and a counterweight. One end of the traction steel wire rope is connected to the elevator car 201, and the other end is connected to the counterweight. The elevator car 201 can be raised or lowered by changing the relative position of the elevator car 201 and the counterweight.

[0034] One end of the power module 102 is connected to the power supply 202, and the other end is connected to the traction mechanism. The power module 102 converts the electrical energy provided by the power supply 202 into mechanical energy, and then transmits the mechanical energy to the traction mechanism to drive the elevator car 201.

[0035] Figure 2 This is another schematic diagram of the safety clamp reset control system provided in an embodiment of the present disclosure.

[0036] In some embodiments, reference Figure 2The power module 102 includes a frequency converter 112 and a motor 122. The frequency converter 112 controls the operating state of the AC motor 122 by changing the frequency of the power supply 202, thereby achieving energy saving and speed regulation. The input terminal of the frequency converter 112 is connected to the power supply 202, and the output terminal of the frequency converter 112 is connected to the input terminal of the motor 122. The motor 122 is also connected to the guide mechanism 101. The frequency converter 112 can be an AC-DC-AC frequency converter 112, which can convert the AC power input from the power supply 202 into DC power and then back into AC power. The AC-DC-AC frequency converter 112 uses electrolytic capacitors of a certain capacity, thus possessing excellent control characteristics and enabling precise control of the output current. To ensure production reliability, the motor 122 is designed with a certain margin of safety when used in power drive applications. When the motor 122 cannot operate at full load, the excess torque, in addition to meeting the power drive requirements, increases the consumption of active power. The cooperation between the frequency converter 112 and the motor 122 can eliminate the extra consumption of active power, reduce energy waste, and improve the overall energy-saving effect of the elevator system. When designing the frequency converter 112 for power drive, it generally has a certain margin to output sufficient current, thereby realizing the reset action after the elevator car 201 has been stopped in an emergency. Since the frequency converter 112 itself also consumes power, sufficient consideration needs to be given to the power margin of the frequency converter 112 when designing the safety clamp reset control system 100. For example, the power margin of the frequency converter 112 should be controlled between 10% and 20%.

[0037] Figure 3 This is another structural schematic diagram of the safety clamp reset control system provided in the embodiments of this disclosure.

[0038] In some embodiments, reference Figure 3 The frequency converter 112 may include a control unit 113. The control unit 113 controls the output current of the frequency converter 112. The control unit 113 can operate according to a set program, controlling the amplitude and pulse width of the square wave output by the frequency converter 112, superimposing it into an approximately sinusoidal alternating current to drive the AC motor 122. The control unit 113 may include a microprocessor, a memory, and a communication interface. The communication interface can be used to connect the control unit 113 to an external controller. The external controller can input parameters or other signals to the control unit 113 through the communication interface. The microprocessor can process the input parameters or other signals into control signals, store the control signals in the memory, and control the output frequency and voltage of the frequency converter 112 according to the control signals, thereby controlling the operating state of the motor 122.

[0039] The control unit 113 can also detect the output current of the inverter 112 and compare the output current value with the warning current value of the inverter 112. The warning current value is a parameter stored in the control unit 113 and is related to the output limit value of the inverter 112. The warning current value can be set within 80%-90% of the output limit value of the inverter 112. For example, the warning current value can be set to 80%, 81%, 84%, 85%, or 90% of the output limit value of the inverter 112. When the output current value detected by the control unit 113 is equal to the warning current value, the control unit 113 controls the output current of the inverter 112 to stop increasing, so as to utilize the power of the inverter 112 as efficiently as possible and prevent the current flowing through the inverter 112 from exceeding the limit output value of the inverter 112 during the safety clamp reset process, thereby avoiding damage to the inverter 112 and improving the safety of the inverter 112. For example, the warning current value is 85% of the limit value. When the output current value detected by the control unit 113 is equal to 85% of the limit value, the control unit 113 controls the output current of the frequency converter 112 to maintain at 85% of the limit value and stop increasing. The warning current value can be a preset value within the frequency converter 112, and the warning current value can also be modified to adapt to different operating conditions of the frequency converter 112. One method to modify the warning current value is, for example, by connecting an external controller to the communication interface of the control unit 113, and changing the warning current value stored in the memory through the external controller.

[0040] In some embodiments, the frequency converter 112 further includes a rectifier unit 114 and an inverter unit 115. The input terminal of the rectifier unit 114 is connected to the power supply 202, and the output terminal of the rectifier unit 114 is connected to the input terminal of the inverter unit 115. The output terminal of the inverter unit 115 is connected to the input terminal of the motor 122, and the output terminal of the inverter unit 115 serves as the output terminal of the frequency converter 112.

[0041] The rectifier unit 114 is connected to the power supply 202. The rectifier unit 114 converts the AC power input from the power supply 202 into DC power, which is then converted by the inverter unit 115. The rectifier unit 114 typically consists of diodes. For example, when the input AC power is in the positive half-cycle, the diodes conduct, allowing current to flow; while when the input AC power is in the negative half-cycle, the diodes are cut off, preventing current flow. Thus, the rectifier unit 114 converts the input AC power into pulsed DC power. In some embodiments, the rectifier unit 114 may include a three-phase bridge rectifier. The three-phase AC power input from the power supply 202 can pass through an absorption capacitor and a varistor network into the input terminal of the three-phase bridge rectifier. The network can absorb high-frequency harmonic signals and surge overvoltages from the AC power grid to prevent damage to the inverter 112. When the power supply 202 voltage is three-phase 380V, the maximum reverse voltage of the rectifier devices is typically 1200-1600V, and the maximum rectified current is twice the rated current of the inverter 112. The three-phase power supply 202 includes R phase, S phase and T phase. R phase refers to the power supply 202 input line of the three-phase power supply inverter 112, S phase refers to the power supply 202 input line of the three-phase power supply servo drive, and T phase refers to the power supply 202 input line of the three-phase power supply servo spindle drive.

[0042] Inverter unit 115 is connected to rectifier unit 114. The DC current converted by rectifier unit 114 enters inverter unit 115, and the output of inverter unit 115 is AC current. Inverter unit 115 can be composed of power devices such as IGBTs (Insulated Gate Bipolar Transistors) and / or MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors). Control unit 113 is connected to inverter unit 115 and is used to control the output current of inverter unit 115. The control signal output by control unit 113 enters inverter unit 115, controlling the IGBTs and / or MOSFETs within inverter unit 115 to turn on and off according to a certain pattern, thereby converting DC current into AC current of a variable frequency. In some embodiments, the inverter unit 115 may include a three-phase bridge inverter circuit, which may consist of six power devices. The power devices are controlled by the control signals output by the control unit 113 to be turned on or off, so as to obtain a three-phase AC power output of any frequency.

[0043] The control unit 113 can also detect the output current value of the inverter unit 115 and compare it with the warning current value stored in the control unit 113. When the control unit 113 detects that the output current value of the inverter unit 115 is the same as the warning current value, the control unit 113 can output a control signal to stop the current output by the inverter unit 115 from increasing. For example, if the warning current value stored in the control unit 113 is 85% of the limit current value of the inverter 112, when the control unit 113 detects that the output current value of the inverter unit 115 is the same as the warning current value, the control unit 113 outputs a control signal. After receiving the control signal, the inverter unit 115 controls the output current value to maintain it at 85% of the limit current value of the inverter 112 and stops it from increasing further, thereby protecting the inverter 112 from overload damage and improving the safety of the safety clamp reset control system 100.

[0044] In some embodiments, the inverter 112 may further include an intermediate unit. The intermediate unit is disposed between the rectifier unit 114 and the inverter unit 115, with the output terminal of the rectifier unit 114 connected to the input terminal of the intermediate unit, and the output terminal of the intermediate unit connected to the input terminal of the inverter unit 115. The intermediate unit may include a filter circuit, which can filter the current and voltage output from the rectifier unit 114 to reduce fluctuations in DC voltage and current, thereby improving the safety of the inverter 112. The filter circuit may include filter capacitors and inductors. Filter capacitors can store electrical energy, making the output DC current more stable. Inductors can eliminate ripple in the DC current, thereby improving voltage stability.

[0045] In some embodiments, the control unit 113 may include a central processing unit (CPU) and a drive circuit. The CPU can process various information input to the control unit 113 and generate a PWM signal. The output of the CPU can be connected to the input of the drive circuit, which can process the PWM signal generated by the CPU into a control signal. The output of the drive circuit is connected to the inverter unit 115, and the control signal output by the drive circuit can control the operation of the inverter unit 115, thereby controlling the output current of the frequency converter 112.

[0046] In some embodiments, the control unit 113 may further include a Hall element 11. The Hall element 11 may be disposed on the output line of the inverter 112, and the Hall element 11 is used to detect the current on the output line. The Hall element 11 detects the current by relying on its own electromagnetic properties. When the current flows through the Hall element 11, the magnetic field on the Hall element 11 affects the trajectory of electrons, causing electrons to accumulate on one side of the Hall element 11, generating a potential difference. The magnitude of the current flowing through the Hall element 11 can be calculated by measuring the potential difference. The Hall element 11 may be connected to the central processing unit in the control unit 113. The central processing unit receives the potential difference information on the Hall element 11 and processes it into current information flowing through the Hall element 11. Then, the central processing unit can compare the current information with the warning current value, make a control decision based on the comparison result, generate a PWM signal, and then process the PWM signal into a control signal through the drive circuit. In some embodiments, the control unit 113 may include three Hall elements 11, which are respectively disposed on three lines at the output of the inverter unit 115, such as the U-phase sequence line, the V-phase sequence line, and the W-phase sequence line.

[0047] The electric motor 122 converts the electrical energy input to the motor 122 via the frequency converter 112 into mechanical energy. In some embodiments, the electric motor 122 may include an encoder 12. The encoder 12 is typically directly connected to the motor shaft and is used to detect the rotational speed of the motor 122 to achieve precise drive control of the rotor of the motor 122. When the motor 122 rotates, the encoder 12 continuously outputs pulse signals, each pulse signal corresponding to a tiny movement of the motor shaft. By recording these pulse signals, the current position information of the motor shaft and the rotational speed information of the motor 122 can be obtained. The encoder 12 provides accurate feedback signals for the control of the motor 122, thereby enabling closed-loop control of the motor 122 and improving the stability and reliability of the motor 122.

[0048] The electric motor 122 transmits mechanical energy to the elevator car 201 through the guide mechanism 101, thereby driving the elevator car 201 upward. During the upward movement, the elevator car 201, driven by the linkage mechanism, causes the wedge-shaped structure on the safety clamp to fall back, thus resetting the safety clamp.

[0049] The detection module 103 is used to detect whether the safety clamp has been successfully reset. In some embodiments, the detection module 103 may be an automatic reset switch in the computer room. By observing the reset state of the automatic reset switch, it can be determined whether the safety clamp has been successfully reset. In other embodiments, the detection module 103 may also be an image detection device. The image detection device may be located on one side of the safety clamp. The image detection device can directly observe whether the wedge structure on the safety clamp has fallen back. When the wedge structure falls back, it is determined that the safety clamp has been successfully reset.

[0050] The safety gear reset control system 100 is configured to perform n reset steps during the safety gear reset process to successfully reset the safety gear without damaging the inverter 112. Here, n is a positive integer greater than or equal to 1.

[0051] During each reset step, the inverter 112 is connected to the power supply 202. The AC power input from the power supply 202 is converted into DC power by the rectifier unit 114. The DC current enters the inverter unit 115, which converts it into AC power of a certain frequency to control the operation of the motor 122. The control unit 113 outputs a PWM signal according to a preset program. The drive circuit processes the PWM signal into a control signal and inputs the control signal into the inverter unit 115 to control the output current of the inverter unit 115. The control unit 113 also detects the current on the output line of the inverter unit 115 through the Hall element 11. The Hall element 11 measures the potential difference information on the output line of the inverter unit 115. The central processing unit processes the potential difference information into current information and compares the current information with the warning current value of the inverter 112 stored in the central processing unit. Based on the comparison result, a decision is made, and then the central processing unit outputs the decision as a PWM signal. The PWM signal is processed into a control signal by the drive circuit, and the output current of the inverter 112 is adjusted by the control signal. The decision-making process includes, for example, when the central processing unit (CPU) detects that the output current value is less than the warning current value, the CPU controls the inverter unit 115 to increase the output current. Alternatively, when the CPU detects that the output current value is equal to the warning current value, the CPU controls the inverter unit 115 to maintain the current output current. And yet another example is when the CPU detects that the output current value is greater than the warning current value, the CPU controls the inverter unit 115 to decrease the output current until the output current value equals the warning current value.

[0052] The motor 122 is driven by the current input from the frequency converter 112, which rotates the motor 122 shaft, converting electrical energy into mechanical energy. The encoder 12 monitors the motor 122 shaft in real time to provide feedback on the motor 122's operating status. The mechanical energy output by the motor 122 is transmitted to the elevator car 201 through the guide mechanism 101, causing the elevator car 201 to move upward. When the elevator car 201 moves upward, the linkage mechanism drives the wedge structure inside the safety gear to move, and the wedge structure falls back to reset the safety gear.

[0053] Figure 4 A timing diagram of the output current of a frequency converter provided in an embodiment of this disclosure.

[0054] refer to Figure 4The power module 102 continuously outputs current for time T1, and the elevator car 201 correspondingly performs an upward movement for time T1. After time T1, the detection module 103 checks whether the safety gear has successfully reset. If the detection module 103 detects that the safety gear has successfully reset, the complete reset process ends, and the operator can use the elevator normally. If the detection module 103 detects that the safety gear has not successfully reset, the inverter 112 stops outputting current, and the motor 122 stops running to allow the inverter 112 to cool down. After the inverter 112 has cooled down for time T2, the power module 102 outputs current again for time T1, and the elevator car 201 correspondingly performs an upward movement for time T1. After time T1, the detection module 103 checks again whether the safety gear has successfully reset. If the detection module 103 detects that the safety gear has successfully reset, the complete reset process ends, and the operator can use the elevator normally. If the detection module 103 detects that the safety gear has not successfully reset, the inverter 112 stops outputting current, and the motor 122 stops running to allow the inverter 112 to cool down. After the inverter 112 cools down for time T2, the power module 102 outputs current again for time T1, and the elevator car 201 also moves upward for time T1. After time T1, the detection module 103 checks again whether the safety gear has been successfully reset. This process continues until the detection module 103 detects that the safety gear has been successfully reset, at which point the entire reset process ends.

[0055] In some embodiments, the duration of time T1 in each reset step can be the same. In other embodiments, the duration of time T1 in each reset step can be different. It is understood that time T1 refers to the output current time of power module 102, and the output current time of power module 102 can be modified according to the specific operating conditions of inverter 112 to adapt to different inverter types and different operating conditions. In some embodiments, the duration of time T1 can be set by the control module to control inverter 112. For example, the control module can adaptively modify time T1 based on the characteristics of inverter 112 or its fatigue characteristics to avoid overwork and damage to inverter 112, thereby extending the service life of inverter 112.

[0056] In some embodiments, the duration of time T2 in each reset step can be the same. In other embodiments, the duration of time T2 in each reset step can be different. It is understood that time T2 refers to the time during which the power module 102 stops outputting current and cools down. The cooling time of the power module 102 can be modified according to the specific operating conditions of the inverter 112 to adapt to different inverter types and operating conditions. In some embodiments, the duration of time T2 can be set by the control module to control the inverter 112. For example, the control module can adaptively modify time T2 based on the characteristics of the inverter 112 model or fatigue patterns to maximize the operating efficiency of the inverter 112 and prevent it from overworking and being damaged, thereby extending the service life of the inverter 112.

[0057] The safety clamp reset control system 100 provided in the above-disclosed embodiment is used to control the safety clamp to reset. It comprises three main components: a guide mechanism 101 for pulling the elevator car 201; a power module 102, one end of which is connected to a power source 202, and the other end of which is connected to the guide mechanism 101, providing power for the movement of the guide mechanism 101; and a detection module 103 connected to the safety clamp, used to detect whether the safety clamp has successfully reset, and also connected to the power module 102. The safety clamp reset control system 100 is configured to perform n reset steps to successfully reset the safety clamp. In each reset step, the power module 102 outputs current for a duration of T1, pulling the elevator car 201 upwards via the guide mechanism 101, thus resetting the safety clamp. After T1, the detection module 103 detects whether the safety clamp has successfully reset. If the detection module 103 detects that the safety clamp has successfully reset, the safety clamp reset process is complete, and the elevator can be used normally. If the detection module 103 detects that the safety clamp has not successfully reset, the power module 102 stops outputting current and cools down for time T2 to avoid overloading and damage to the power module 102, thereby reducing the safety hazards of the safety clamp reset control system 100. After time T2, the power module 102 outputs current for time T1 to guide the elevator car 201 upward through the guide mechanism 101, thereby resetting the safety clamp. After time T1, the detection module 103 checks again whether the safety clamp has successfully reset. If the detection module 103 detects that the safety clamp has successfully reset, the safety clamp reset process is complete, and the elevator can be used normally. If the detection module 103 detects that the safety clamp has not successfully reset, the safety clamp reset step continues, repeating the reset step until the detection module 103 detects that the safety clamp has successfully reset. Here, n is a positive integer greater than or equal to 1. By using the safety clamp reset control system 100 provided in the above-disclosed embodiments to reset the elevator safety clamp, the power module 102 can be protected during the reset process, avoiding damage to the power module 102, thereby improving the safety of the safety clamp during the reset process, and increasing the success rate of safety clamp reset while improving the safety of the safety clamp, thereby improving the overall operating efficiency of the elevator system.

[0058] Accordingly, another embodiment of this disclosure also provides an elevator system, which includes the safety clamp reset control system 100 provided in the foregoing embodiment. The elevator system provided in another embodiment of this disclosure will be described in detail below with reference to the accompanying drawings. For parts that are the same as or corresponding to the previous embodiment, please refer to the corresponding descriptions in the foregoing embodiments; detailed descriptions will not be repeated below.

[0059] An elevator system can include multiple components, such as an electrical control system, a door system, an electric drive system, a guide system, and a weight balance system. These systems are interconnected and work together to support the normal operation of the elevator.

[0060] In some embodiments, the elevator system includes a safety gear reset control system 100, which can be integrated with other components within the elevator system. It is understood that structures within the safety gear reset control system 100 can function within or be combined with other systems to achieve various elevator functions. For example, the guide mechanism 101 in the safety gear reset control system 100 can perform a transmission function in an electric drive system. As another example, the power module 102 in the safety gear reset control system 100 can be connected to an electrical control system, which can control the operation of the elevator car 201 by controlling the power module 102.

[0061] The elevator system provided in the above-disclosed embodiments includes the safety clamp reset control system 100 provided in the aforementioned embodiments. The safety clamp reset control system 100 can work in conjunction with other systems within the elevator system to achieve normal operation and maintenance of the elevator. By using the safety clamp reset control system 100 provided in the aforementioned embodiments to control the reset of the elevator car 201 in the elevator system, the success rate of the reset can be increased while improving the safety of the reset process, thereby improving the operating efficiency of the elevator system and thus improving its maintenance efficiency.

[0062] Accordingly, another embodiment of this disclosure also provides a safety gear reset control method, which can be used to control the safety gear reset control system 100 provided in the foregoing embodiment. The safety gear reset control method provided in another embodiment of this disclosure will be described in detail below with reference to the accompanying drawings. For parts that are the same as or corresponding to the previous embodiment, please refer to the corresponding descriptions in the foregoing embodiments; detailed descriptions will not be repeated below.

[0063] A test was conducted to link the speed governor and safety gear. The speed governor and safety gear successfully stopped the elevator car 201. The safety gear was stuck, and preparations were made to reset the safety gear.

[0064] Figure 5 This is a step diagram of a safety clamp reset control method provided in another embodiment of the present disclosure.

[0065] refer to Figure 5 The safety gear reset control method includes the following steps.

[0066] During the first reset process, the power module 102 provides power to the guide mechanism 101.

[0067] In some embodiments, the frequency converter 112 in the power module 102 is connected to the power supply 202, and the frequency converter 112 outputs current to the motor 122, which is converted into torque by the motor 122. The guide mechanism 101 is connected to the motor 122 and is driven by the motor 122 to pull the elevator car 201 upward. When the elevator car 201 moves upward, it drives the safety clamp to reset through the linkage mechanism.

[0068] During the process of inverter 112 outputting current to motor 122, the output current of inverter 112 gradually increases and approaches the limit current value of inverter 112. In some embodiments, control unit 113 in inverter 112 monitors the output current of inverter 112 in real time through Hall element 11 and compares the output current with the warning current of inverter 112. For example, the warning current value of inverter 112 is stored in control unit 113, and Hall element 11 can input the detected potential difference signal to the central processing unit of control unit 113. The central processing unit processes the potential difference signal into current information, compares the current information with the warning current value, makes a control decision based on the comparison result, generates a PWM signal, and then processes the PWM signal into a control signal through the drive circuit. When the central processing unit detects that the output current is less than the warning current, control unit 113 controls inverter unit 115 to increase the output current until the current value output by inverter unit 115 equals the warning current value. When the central processing unit detects that the output current equals the warning current, the control unit 113 controls the output current of the inverter unit 115 to remain constant; this output current value is taken as the stable value. When the central processing unit detects that the output current is greater than the warning current, the control unit 113 controls the output current of the inverter unit 115 to decrease until the current value output by the inverter unit 115 equals the warning current value. Under the control of the control unit 113, the frequency converter 112 provides the motor 122 with a current value equal to the stable value for a duration of T1. The motor 122, controlled by the output current of the frequency converter 112, drives the elevator car 201 to attempt a reset impact, thereby loosening the wedge structure and facilitating the reset of the safety clamp.

[0069] After time T1, the detection module 103 checks whether the safety clamp has been successfully reset.

[0070] If the detection module 103 detects that the safety gear has been successfully reset, the first reset process ends. At this point, the safety gear has been successfully reset, and the operator can use the elevator normally.

[0071] If the detection module 103 detects that the safety clamp reset is unsuccessful, a second reset process is performed. The second reset process includes a cooling time T2 for the power module 102. During this time, the control unit 113 controls the inverter 112 to stop outputting current, and the motor 122 stops running, allowing the inverter 112 to cool down. This helps prevent the inverter 112 from operating with excessive heat for extended periods, thus extending its lifespan and improving the economy of the elevator system. After time T2, the power module 102 outputs current again to power the guide mechanism 101, pulling the elevator car 201 upwards for a duration T1. The process of the power module 102 outputting current again includes: the control unit 113 outputting a PWM signal according to a preset program; the drive circuit processing the PWM signal into a control signal and inputting the control signal to the inverter unit 115 to control the inverter unit 115 to output current, thereby causing the inverter 112 to output current and drive the motor 122. The Hall element 11 continuously detects the potential difference signal on the output line of the inverter 112 and processes it into current information through the central processing unit. The central processing unit (CPU) compares the current information with the warning current of the inverter 112, and the output current gradually increases until it approaches the warning current value. When the output current is less than the warning current, the CPU controls the inverter unit 115 to increase the output current. When the output current equals the warning current, the CPU controls the inverter unit 115 to maintain the current output current unchanged. This output current is taken as a stable value, and the inverter 112 outputs a stable current for time T1. When the output current is greater than the warning current, the CPU controls the inverter unit 115 to decrease the output current until it equals the warning current, preventing the inverter 112 from being overloaded and thus avoiding damage to the inverter 112, thereby avoiding safety hazards during the safety clamp reset process. The motor 122, controlled by the output current of the inverter 112, drives the elevator car 201 to attempt a reset impact, loosening the wedge structure and promoting the reset of the safety clamp.

[0072] After time T1, the detection module 103 checks again whether the safety clamp has been successfully reset.

[0073] If the detection module 103 detects that the safety gear has been successfully reset, the second reset process ends. At this point, the safety gear has been successfully reset, and the operator can use the elevator normally.

[0074] If the detection module 103 detects that the safety clamp reset is unsuccessful, a third reset process is performed. The third reset process includes a cooling time T2 for the power module 102. During this time, the control unit 113 controls the inverter 112 to stop outputting current, and the motor 122 stops running to allow the inverter 112 to cool down. This helps prevent the inverter 112 from operating with excessive heat for extended periods, thus extending its lifespan and improving the economy of the elevator system. After time T2, the power module 102 outputs current again to power the guide mechanism 101, pulling the elevator car 201 upwards for a duration T1. The process of the power module 102 outputting current again includes: the control unit 113 outputting a PWM signal according to a preset program; the drive circuit processing the PWM signal into a control signal and inputting the control signal into the inverter unit 115 to control the inverter unit 115 to output current, thereby causing the inverter 112 to output current and drive the motor 122. The Hall element 11 continuously detects the potential difference signal on the output line of the inverter 112 and processes it into current information through the central processing unit. The central processing unit (CPU) compares the current information with the warning current of the inverter 112, and the output current gradually increases until it approaches the warning current value. When the output current is less than the warning current, the CPU controls the inverter unit 115 to increase the output current. When the output current equals the warning current, the CPU controls the inverter unit 115 to maintain the current output current unchanged. This output current is taken as a stable value, and the inverter 112 outputs a stable current for time T1. When the output current is greater than the warning current, the CPU controls the inverter unit 115 to decrease the output current until it equals the warning current, preventing the inverter 112 from being overloaded and thus avoiding damage to the inverter 112, thereby avoiding safety hazards during the safety clamp reset process. The motor 122, controlled by the output current of the inverter 112, drives the elevator car 201 to attempt a reset impact, loosening the wedge structure and promoting the reset of the safety clamp.

[0075] After time T1, the detection module 103 checks again whether the safety clamp has been successfully reset.

[0076] If the detection module 103 detects that the safety gear has been successfully reset, the third reset process ends. At this point, the safety gear has been successfully reset, and the operator can use the elevator normally.

[0077] If the detection module 103 detects that the safety clamp reset is unsuccessful, a fourth reset process is performed. This process continues in sequence. The elevator car 201, pulled by the motor 122, makes multiple impact attempts to loosen the wedge structure while ensuring that the inverter 112 does not operate under overload, thereby facilitating the successful reset of the safety clamp.

[0078] The control unit 113 controls the frequency converter 112 to repeat the above reset process until the detection module 103 detects that the safety clamp has been successfully reset. Then the safety clamp reset process is completed, and the operator can use the elevator normally.

[0079] In some embodiments, refer again Figure 4 The duration of time T1 in each reset step can be the same. In other embodiments, the duration of time T1 in each reset step can be different. It is understood that time T1 refers to the output current time of power module 102, and the output current time of power module 102 can be modified according to the specific operating conditions of inverter 112 to adapt to different inverter types and different operating conditions. In some embodiments, the duration of time T1 can be set by the control module to control inverter 112. For example, the control module can adaptively modify time T1 based on the characteristics of inverter 112 or its fatigue characteristics to avoid overwork and damage to inverter 112, thereby extending the service life of inverter 112.

[0080] In some embodiments, the duration of time T2 in each reset step can be the same. In other embodiments, the duration of time T2 in each reset step can be different. It is understood that time T2 refers to the time during which the power module 102 stops outputting current and cools down. The cooling time of the power module 102 can be modified according to the specific operating conditions of the inverter 112 to adapt to different inverter types and operating conditions. In some embodiments, the duration of time T2 can be set by the control module to control the inverter 112. For example, the control module can adaptively modify time T2 based on the characteristics of the inverter 112 model or fatigue patterns to maximize the operating efficiency of the inverter 112 and prevent it from overworking and being damaged, thereby extending the service life of the inverter 112.

[0081] The safety clamp reset control method provided in the above-disclosed embodiments includes at least one reset process, which includes the following steps: At the start of the first reset process, the power module 102 provides power to the guide mechanism 101, which pulls the elevator car 201 upwards. As the elevator car 201 moves upwards, it drives the safety clamp to reset via a linkage mechanism. The power module 102 provides power for a duration of T1. After T1, the detection module 103 detects whether the safety clamp has been successfully reset. If the detection module 103 detects that the safety clamp has been successfully reset, the first reset process ends. If the detection module 103 detects that the safety clamp has not been successfully reset, the second reset process begins. The power module 102 cools for a time T2 and then provides power to the guide mechanism 101 again for a duration of T1. After T1, the detection module 103 detects again whether the safety clamp has been successfully reset. If the detection module 103 detects that the safety clamp has been successfully reset, the second reset process ends. If the detection module 103 detects that the safety clamp reset is unsuccessful, the third reset process begins. After a cooling time T2, the power module 102 provides power to the guide mechanism 101 again for a duration of T1. This process is repeated until the detection module 103 detects that the safety clamp reset is successful. In the above reset steps, by providing power to the guide mechanism 101 multiple times to drive the elevator car 201 upwards for a reset impact, the success rate of the safety clamp reset can be improved. Furthermore, after each reset impact attempt, the power module 102 is given cooling time, which helps extend the service life of the power module 102, avoids prolonged overload operation of the power module 102, and prevents damage to the power module 102 during the safety clamp reset process, thereby improving the safety of the safety clamp reset process.

[0082] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of this disclosure. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.

Claims

1. A safety gear reset control system for controlling the safety gear to reset, characterized in that, The safety clamp reset control system includes: A guiding mechanism, which is used to pull the elevator car; A power module, one end of which is connected to a power source and the other end of which is connected to the guide mechanism, is used to provide power for the movement of the guide mechanism; The detection module is connected to the safety clamp and is used to detect whether the safety clamp has been successfully reset; the detection module is also connected to the power module. The safety clamp reset control system is configured to perform n reset steps to ensure successful reset of the safety clamp. In each reset step, the power module outputs current for a duration of T1. After T1, the detection module checks whether the safety clamp has successfully reset. When the detection module detects that the safety clamp has not successfully reset, the power module stops outputting current and cools for a duration of T2. After T2, the power module outputs current for a duration of T1. After T1, the detection module checks whether the safety clamp has successfully reset. The reset steps are repeated until the detection module detects that the safety clamp has successfully reset, where n is a positive integer greater than or equal to 1. The power module includes a frequency converter, the input terminal of which is connected to the power supply. The frequency converter includes a control unit, which controls the output current of the frequency converter to prevent it from being overloaded and damaged.

2. The safety clamp reset control system according to claim 1, characterized in that, The power module also includes: An electric motor, the input end of which is connected to the output end of the frequency converter, and the electric motor is connected to the guiding mechanism.

3. The safety clamp reset control system according to claim 2, characterized in that, The control unit is also used to detect the output current of the frequency converter and compare the output current value with the warning current value of the frequency converter. When the output current value is equal to the warning current value, the control unit controls the output current of the frequency converter to stop increasing.

4. The safety clamp reset control system according to claim 3, characterized in that, The frequency converter also includes: A rectifier unit, the input terminal of which is connected to a power supply; An inverter unit is provided, the input terminal of which is connected to the output terminal of the rectifier unit, and the output terminal of which is connected to the input terminal of the motor. The output terminal of the inverter unit serves as the output terminal of the frequency converter. A control unit is connected to the inverter unit and is used to control the output current of the inverter unit. The control unit is also used to detect the output current value of the inverter unit.

5. The safety clamp reset control system according to claim 3, characterized in that, The control unit includes a Hall element, which is disposed on the output line of the frequency converter and is used to detect the current on the output line.

6. The safety clamp reset control system according to claim 2, characterized in that, The motor also includes an encoder for detecting the rotational speed of the motor.

7. An elevator system, characterized in that, include: The safety clamp reset control system as described in any one of claims 1 to 6.

8. A safety clamp reset control method, characterized in that, The safety clamp reset method includes: At the start of the first reset process, the power module provides power to the guide mechanism, which pulls the elevator car upward. As the elevator car moves upward, it drives the safety clamp to reset via a linkage mechanism. The power module provides power for a duration of T1. After T1, the detection module checks whether the safety clamp has been successfully reset; If the detection module detects that the safety clamp has been successfully reset, the first reset process ends. If the detection module detects that the safety clamp has failed to reset, the second reset process begins. After the power module cools down for a time T2, it provides power to the guide mechanism again for a duration of T1. After T1, the detection module checks again whether the safety clamp has been successfully reset; If the detection module detects that the safety clamp has been successfully reset, the second reset process ends. If the detection module detects that the safety clamp has failed to reset, the third reset process begins. After the power module cools down for a time T2, it provides power to the guide mechanism again for a duration of T1. Repeat the above reset process until the detection module detects that the safety clamp has been successfully reset. The power module includes a frequency converter, the input terminal of which is connected to a power source. The frequency converter includes a control unit, which controls the output current of the frequency converter to prevent it from being overloaded and damaged.

9. The safety clamp reset control method according to claim 8, characterized in that, The process by which the power module provides power to the guidance mechanism includes: The power supply provides current to the frequency converter, the frequency converter provides current to the motor, and the motor is driven by the current to move the guiding mechanism. When the first reset process begins, the control unit of the inverter controls the inverter to output current until a stable value is reached. When the current is maintained at a stable value, the control unit controls the inverter to output current for a continuous time T1. At the start of the second reset process, the control unit controls the inverter to stop outputting current and cool down for time T2. After time T2, the control unit controls the inverter to output current until it reaches a stable value. When the current remains at a stable value, the control unit controls the inverter to continue outputting current for time T1. At the start of the third reset process, the control unit controls the inverter to stop outputting current and cool down for time T2. After time T2, the control unit controls the inverter to output current until the stable value is reached. When the current is maintained at the stable value, the control unit controls the inverter to output current for time T1. The control unit controls the frequency converter to repeat the above reset process until the detection module detects that the safety clamp has been successfully reset.

10. The safety clamp reset control method according to claim 9, characterized in that, The process by which the power module provides power to the guidance mechanism also includes: After the reset process begins, the control unit detects the output current of the frequency converter and compares the output current with the warning current of the frequency converter; When the output current equals the warning current, the control unit controls the output current of the frequency converter to remain constant, and the output current at this time is taken as the stable value.

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