Method and device for monitoring the braking force of an elevator brake

Abstract

The present disclosure provides a method for monitoring brake force of elevator brake, which can be applied to the technical field of elevator control and brake. The method comprises: controlling a brake to be tested to be closed at the end of normal operation of an elevator; reducing the output torque of a frequency converter to a minimum maintenance torque and monitoring the displacement of a first motor; if the displacement of the first motor is greater than a preset threshold, determining that the brake force of the brake to be tested is unqualified, sending a fault signal to a controller and executing a safety control strategy; if the displacement of the first motor is less than the preset threshold, determining that the brake force of the brake to be tested is qualified, controlling another group of brakes to be closed, and ending the monitoring of the brake force of the brake. The method of the present disclosure can monitor the failure of the brake due to the failure of the brake to be correctly released, and can also monitor the ability of the two groups of brakes or one group of brakes to stop the car. The present disclosure also provides a device for monitoring brake force of elevator brake, an elevator, a storage medium and a program product.

Description

Technical Field

[0001] This disclosure relates to the field of elevator control and braking technology, specifically to the field of elevator braking force monitoring technology, and more specifically to a method, device, equipment, medium, and program product for monitoring the braking force of an elevator brake. Background Technology

[0002] In elevator control applications, the brake generates braking torque through the friction between the brake pads and the traction components. It is a safety device that ensures the car does not shift when the traction motor is de-energized. With prolonged use, the brake pads may wear down, resulting in a decrease in braking force and an increase in braking stroke, which affects the safe operation of the elevator.

[0003] In one example, braking force is tested during proper lifting (or releasing) of the mechanical device or during regular maintenance to address issues related to decreased braking performance due to brake aging and wear.

[0004] However, the above methods are not timely and cannot detect problems with the braking force of the elevator brake in a timely manner, which poses certain safety hazards and affects the user experience. Summary of the Invention

[0005] In view of the above problems, this disclosure provides a method, device, equipment, medium and program product for monitoring the braking force of an elevator brake.

[0006] According to a first aspect of this disclosure, a method for monitoring the braking force of an elevator brake is provided, comprising: controlling the brake to be tested to close at the end of the normal operation phase of the elevator;

[0007] Reduce the inverter output torque gradually to the minimum holding torque and monitor the displacement of the first motor;

[0008] If the displacement of the first motor exceeds a preset threshold, the braking force of the brake under test is determined to be unqualified, a fault signal is sent to the controller, and a safety control strategy is executed; and

[0009] If the displacement of the first motor is less than a preset threshold, the braking force of the brake under test is determined to be qualified, and the other set of brakes is controlled to close, thus ending the brake force monitoring.

[0010] According to embodiments of this disclosure, the implementation of the security control strategy includes:

[0011] Control the closure of another set of brakes;

[0012] The output torque of the frequency converter is gradually reduced to zero, and the displacement of the second motor is monitored.

[0013] If the displacement of the second motor is greater than the preset threshold, it is determined that the braking force of both sets of brakes on the elevator is unqualified, and a safe stopping strategy is executed; and

[0014] If the displacement of the second motor is less than the preset threshold, it is determined that there is a set of brakes in the elevator that have unqualified braking force, and the elevator is controlled to stop running.

[0015] According to embodiments of this disclosure, the execution of the safe docking policy includes:

[0016] The inverter outputs a holding torque to keep the elevator car at the current floor position.

[0017] The elevator's direction of travel is determined based on the weight of the car's side and the weight of the counterweight; and

[0018] Once the elevator reaches the terminal station, control the elevator to stop.

[0019] According to embodiments of this disclosure, determining the elevator's direction of travel based on the car's side gravity and the counterweight's side weight includes:

[0020] When it is determined that the weight on the car side is less than the weight on the counterweight side, the elevator's direction of travel is determined to be from the current floor to the top floor; and

[0021] When it is determined that the weight on the car side is less than the weight on the counterweight side, the elevator's running direction is determined to be from the current floor position to the ground floor.

[0022] According to embodiments of this disclosure, it further includes:

[0023] Obtain the actual load of the car and the configuration parameters of the elevator traction system, wherein the configuration parameters of the elevator traction system include the rated load of the car, the diameter of the traction sheave, and the system traction ratio;

[0024] The minimum holding torque is determined based on the actual load of the car, the rated load of the car, the diameter of the traction sheave, and the traction ratio of the system.

[0025] According to embodiments of this disclosure, reducing the inverter output torque until the minimum holding torque includes:

[0026] Reduce the inverter output torque according to a preset slope and / or according to a preset curve.

[0027] According to embodiments of this disclosure, the monitoring of motor displacement includes:

[0028] The motor displacement is obtained through a motor encoder.

[0029] A second aspect of this disclosure provides a device for monitoring the braking force of an elevator brake, comprising: a control module for controlling the closure of the brake to be tested at the end of the elevator operation.

[0030] The monitoring module is used to gradually reduce the inverter output torque to the minimum holding torque and monitor the displacement of the first motor.

[0031] The first determining module is used to determine that the braking force of the brake under test is unqualified if the displacement of the first motor is greater than a preset threshold, and to send a fault signal to the controller and execute a safety control strategy.

[0032] The second determining module is used to determine that the braking force of the brake under test is qualified if the displacement of the first motor is less than a preset threshold, control another set of brakes to close, and end the brake force monitoring.

[0033] A third aspect of this disclosure provides an elevator device, including: an elevator brake force monitoring device as described in the second aspect, the elevator brake force monitoring device performing the elevator brake force monitoring method described above.

[0034] A fourth aspect of this disclosure also provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to perform the above-described method for monitoring the braking force of an elevator brake.

[0035] The fifth aspect of this disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method for monitoring the braking force of an elevator brake.

[0036] The elevator brake force monitoring method provided in this disclosure involves the elevator controller controlling the brake to be tested to close after the elevator reaches the destination floor at the end of normal elevator operation. This reduces the output torque of the frequency converter to the minimum holding torque. The braking force of the single brake to be tested is determined by monitoring the motor displacement. By gradually reducing the output torque of the frequency converter, if an abnormal braking torque is detected during the braking force testing process, the controller and frequency converter can respond in a timely manner to ensure the safe operation of the elevator. The method provided in this disclosure can monitor the braking force of the elevator brake during normal elevator operation, thereby improving passenger safety. Attached Figure Description

[0037] The foregoing contents, as well as other objects, features, and advantages of this disclosure, will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0038] Figure 1 A timing diagram illustrating the detection of braking force of two or one set of brakes according to an embodiment of the present disclosure is shown schematically.

[0039] Figure 2 A flowchart illustrating a method for monitoring the braking force of an elevator brake according to an embodiment of the present disclosure is shown schematically.

[0040] Figure 3 A flowchart illustrating a method for monitoring the braking force of a single elevator brake according to an embodiment of the present disclosure is shown schematically.

[0041] Figure 4 A flowchart illustrating a security control strategy according to an embodiment of the present disclosure is shown schematically.

[0042] Figure 5 A flowchart illustrating a method for monitoring the braking force of two sets of elevator brakes according to an embodiment of the present disclosure is shown schematically.

[0043] Figure 6 A schematic diagram illustrating the structure of a monitoring device for the braking force of an elevator brake according to an embodiment of the present disclosure is shown; and

[0044] Figure 7 A block diagram schematically illustrates an electronic device suitable for implementing a method for monitoring the braking force of an elevator brake according to an embodiment of the present disclosure. Detailed Implementation

[0045] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0046] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0047] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0048] When using expressions such as "at least one of A, B, and C", they should generally be interpreted in accordance with the meaning that is commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B, and C, etc.).

[0049] The embodiments of this disclosure provide a method for monitoring the braking force of an elevator brake, comprising: controlling the brake under test to close at the end of normal elevator operation; reducing the output torque of the frequency converter to gradually decrease to the minimum holding torque, and monitoring the displacement of a first motor; if the displacement of the first motor is greater than a preset threshold, determining that the braking force of the brake under test is unqualified, sending a fault signal to the controller and executing a safety control strategy; and if the displacement of the first motor is less than the preset threshold, determining that the braking force of the brake under test is qualified, controlling another set of brakes to close, and ending the brake force monitoring.

[0050] Figure 1 A timing diagram illustrating the detection of braking force of two or one set of brakes according to an embodiment of the present disclosure is shown. Figure 1 The schematic diagrams shown are merely examples that can be used in the embodiments of this disclosure to help those skilled in the art understand the technical content of this disclosure, but do not mean that the embodiments of this disclosure cannot be used in other devices, systems, environments or scenarios.

[0051] like Figure 1 As shown, the controller issues a system start command. The frequency converter outputs compensation torque after a torque compensation delay time S1 until the torque compensation target value S2 is reached. At this time, the pre-torque is completed, and the car remains stationary. The controller issues a command to open the brake. After a brake opening delay time S8, the brake opens. The car starts to run, and the frequency converter output frequency gradually increases to the maximum target frequency S5. The elevator runs to the target floor, and the car generates the target displacement S6. At this time, the frequency converter output frequency gradually decreases to 0 and outputs torque to maintain the car at the current position. The controller controls the closure of two or one set of brakes. After a brake closure delay time S9, the controller receives the brake closure feedback signal. Brake force monitoring begins, and the frequency converter output torque gradually decreases according to the set torque decrease time S3, gradually reducing the electromagnetic torque until the frequency converter torque decrease lower limit value S4 is reached. The displacement of the car (motor encoder displacement) is monitored. If the displacement exceeds the abnormal movement threshold S7 of the car, the brake force detection result is determined to be a failure, and a fault signal is uploaded to the controller.

[0052] Figure 2 A flowchart illustrating a method for monitoring the braking force of an elevator brake according to an embodiment of the present disclosure is shown.

[0053] The monitoring method in this embodiment is applied to the end stage of elevator operation. When the traction system closes the brake to be tested at the end stage of normal elevator operation, the frequency converter outputs a specific slow-descent torque curve to check the displacement or speed of the motor, thereby determining whether the braking force performance of the brake is qualified.

[0054] To enable those skilled in the art to better understand the technical solutions of the embodiments of this disclosure, a brief description of the elevator operation process is provided first. Before the elevator operates, the unbalanced torque needs to be determined. The unbalanced torque measured by the weighing system is as follows:

[0055]

[0056] In formula (1), GK is the mass of the car body, GL is the actual load of the car, GQ is the rated load of the car, g is the gravitational acceleration, which is generally taken as 9.8 N / kg, GM is the mass of the counterweight, DD is the diameter of the traction sheave, δ is the system traction ratio, and GB is the equivalent unbalanced mass of other components of the traction system (traveling cable, compensating chain, etc.).

[0057] To prevent car displacement at the moment of brake release, the unbalanced torque in formula (1) must be applied to the motor shaft before system operation. At this time, the output electromagnetic torque is equal to the unbalanced torque. After the brake is released, the speed loop of the drive is activated, and the car is clamped at zero speed in the current position. After passing the signal detection of the safety circuit, the car moves to the target position at a preset S-shaped speed curve. When the car reaches the target floor, the frequency converter runs at zero speed and maintains torque output. After the brake is closed, the performance status of the brake force is diagnosed, and the operation begins. Figure 2 Operations S210 to S240 are shown.

[0058] During operation S210, at the end of the normal elevator operation phase, the brake to be tested is closed.

[0059] In one example, after the elevator car reaches the target floor, at the end of the elevator's journey, the inverter outputs a holding torque to keep the elevator car level with the current floor. The brake force is then checked, and the controller closes the brake under test. To ensure safety redundancy in the braking system, elevator systems typically have multiple sets of brakes (taking two sets as a common example). Closing one set of brakes completes the braking force check for the other set, ensuring the safety and effectiveness of the braking system. Optionally, both sets of brakes under test can be closed to check if their braking force is within acceptable limits.

[0060] During operation S220, the inverter output torque is gradually reduced to the minimum holding torque, and the displacement of the first motor is monitored.

[0061] In one example, after the brake under test is closed, the inverter continuously outputs the maximum unbalanced torque, gradually reducing the unbalanced torque value until the inverter outputs the minimum maintaining torque. On the one hand, this can detect whether the braking force of the brake under test is qualified. On the other hand, if the braking force of the brake is unqualified, if the output torque is reduced to 0 instantaneously, the car may experience a large displacement and slide out of the gate area, triggering the car accidental movement protection, causing the inverter to shut down and the car to lose control. Therefore, the inverter output torque is gradually reduced, and the motor displacement is monitored to determine whether the car has moved. Optionally, the car speed or motor speed can also be monitored to determine whether the car has moved.

[0062] In operation S230, if the displacement of the first motor is greater than a preset threshold, it is determined that the braking force of the brake under test is unqualified, a fault signal is sent to the controller and a safety control strategy is executed.

[0063] In one example, if the displacement of the first motor is greater than a preset threshold during the process of reducing the output torque (in this embodiment of the disclosure, the preset threshold is set to 1 mm), it is determined that the car has been displaced, and then it is determined that the braking force of the brake group is unqualified. A fault signal is sent to the controller, and the controller executes a preset safety control strategy to ensure the safe operation of the elevator.

[0064] In operation S240, if the displacement of the first motor is less than a preset threshold, it is determined that the braking force of the brake under test is qualified, and another set of brakes is controlled to close, thus ending the brake force monitoring.

[0065] In one example, if the displacement of the first motor is less than a preset threshold, it indicates that the car has not moved or the displacement amplitude is less than the safety threshold. In this case, the braking force of the brake group is determined to be qualified. At this time, the other brake group is controlled to close, and the brake force monitoring ends.

[0066] The elevator brake force monitoring method provided in this embodiment monitors the braking force of the elevator brake at the end of normal elevator operation. By controlling the brake under test to close, the output torque of the frequency converter is gradually reduced. The braking force of the brake under test is determined based on the displacement of the motor. The monitoring method provided in this embodiment monitors the braking force of the brake without affecting the safe operation of the elevator, realizing self-monitoring of the braking force. The method provided in this embodiment is implemented by software control algorithm, without the need to add additional electrical devices. It ensures the real-time performance inspection of the brake without increasing costs and greatly improves the safety redundancy of the elevator braking system.

[0067] Figure 3 A flowchart illustrating a method for monitoring the braking force of a single set of elevator brakes according to an embodiment of the present disclosure is shown. This disclosure describes a method for monitoring the braking force of a single set of brakes as an example. It includes operations S310 to S340.

[0068] During operation S310, at the end of the normal elevator operation phase, the brake of the single unit under test is closed.

[0069] The technical solution and principles of this operation can be found in [link to relevant documentation]. Figure 2 The operation S210 shown will not be described again.

[0070] During operation S340, the inverter output torque is gradually reduced to the minimum holding torque, and the displacement of the first motor is monitored.

[0071] Before operating S340, the minimum holding torque of the inverter output must first be determined. According to an embodiment of this disclosure, the minimum holding torque determination process includes the following operations S320 and S330.

[0072] In operation S320, the actual load of the car and the configuration parameters of the elevator traction system are obtained, wherein the configuration parameters of the elevator traction system include the rated load of the car, the diameter of the traction sheave, and the system traction ratio; in operation S330, the minimum holding torque is determined based on the actual load of the car, the rated load of the car, the diameter of the traction sheave, and the system traction ratio.

[0073] In one example, considering elevator overload operation, and referring to standards GB7588-2018 "Safety Code for Elevator Manufacturing and Installation" and GB24478-2009 "Elevator Traction Machine," the inverter's ramp descent torque value should have a minimum value Temin. The electromagnetic torque during the testing process cannot be less than this value; otherwise, even if the brake meets the standard requirements and works normally, the car may experience abnormal displacement, resulting in a malfunction signal and affecting the normal operation of the system. The minimum value of the inverter's output holding torque T... emi n is:

[0074]

[0075] GK is the mass of the car body, GL is the actual load of the car, GQ is the rated load of the car, g is the gravitational acceleration, generally taken as 9.8 N / kg, GM is the mass of the counterweight, DD is the diameter of the traction sheave, δ is the system traction ratio, and GB is the equivalent unbalanced mass of other components of the traction system (traveling cable, compensating chain, etc.).

[0076] However, when monitoring the braking force of the two sets of brakes, the above situation does not exist, and the minimum value of the inverter output holding torque Temin = 0.

[0077] Considering that some elevators do not have a weighing system, it is not advisable to use a single set of braking force monitoring for elevators without a weighing system.

[0078] According to embodiments of this disclosure, the inverter output torque is reduced according to a preset slope and / or according to a preset curve. The process of controlling the inverter output torque to gradually decrease to the minimum output torque can be a linear decrease in output torque according to a preset slope, or a decrease in output torque according to a preset curve. The specific method of inverter ramp-down is not limited.

[0079] According to embodiments of this disclosure, the frequency converter monitors the motor displacement or speed via motor encoder signals. During the gradual decrease of the output torque of the frequency converter, the first motor displacement is obtained through the motor encoder. Since the motor is connected to the car through the traction system, the displacement of the car can be determined by the motor displacement; that is, when the motor moves, it indicates that the car also moves accordingly.

[0080] In operation S350, if the displacement of the first motor is greater than a preset threshold, it is determined that the braking force of the brake under test is unqualified, a fault signal is sent to the controller and a safety control strategy is executed.

[0081] In one example, once the displacement of the first motor is determined to be greater than a preset threshold, the inverter outputs a holding torque to keep the elevator car at the current floor position and sends a brake force fault signal to the controller, which then executes a safety control strategy. Figure 4 A flowchart illustrating a security control strategy according to an embodiment of this disclosure is shown, such as... Figure 4 As shown, the safety control strategy includes operations S351 to S354.

[0082] In operation S351, control the other set of brakes to close; in operation S352, control the inverter output torque to gradually decrease until zero, and monitor the displacement of the second motor; in operation S353, if the displacement of the second motor is greater than the preset threshold, it is determined that the braking force of the two sets of brakes of the elevator is unqualified, and a safe stopping strategy is executed; in operation S354, if the displacement of the second motor is less than the preset threshold, it is determined that the braking force of one set of brakes of the elevator is unqualified, and the elevator is controlled to stop running.

[0083] In one example, the other set of brakes is closed while the inverter output torque is gradually reduced to zero, and the displacement of the second motor is monitored. If the displacement of the second motor is determined to be greater than a preset threshold of 1mm, it is determined that the braking force of the two sets of brakes of the elevator is insufficient, and the elevator controller executes a safe stopping strategy, specifically including operations S3531 to S3533.

[0084] In operation S3531, the inverter outputs a holding torque to maintain the elevator car at the current floor position. In operation S3532, the elevator's direction of travel is determined based on the car's side gravity and the counterweight's side weight.

[0085] According to an embodiment of this disclosure, when it is determined that the weight on the car side is less than the weight on the counterweight side, the elevator running direction is determined to be from the current floor position to the top floor; when it is determined that the weight on the car side is less than the weight on the counterweight side, the elevator running direction is determined to be from the current floor position to the bottom floor.

[0086] When operating S3533, after the elevator reaches the terminal station, control the elevator to stop running.

[0087] At this point, because the distance between the car or counterweight and the buffer is very small, typically about 100mm, even if the braking force completely fails, the distance the car travels will still ensure that passengers are not injured. The elevator will stop operating and await maintenance personnel inspection until the brake's braking force verification is passed.

[0088] The elevator controller determines that the braking force provided by the two sets of brakes is sufficient to stop the car, but the braking force of one set of brakes is insufficient, so it locks the elevator in its current position and waits for maintenance personnel to inspect it.

[0089] In operation S360, if the displacement of the first motor is less than a preset threshold, the braking force of the brake under test is determined to be qualified, and another set of brakes is controlled to close, thus ending the brake force monitoring.

[0090] The technical solution and principles of this operation can be found in [link to relevant documentation]. Figure 3 The operation S240 shown will not be described in detail.

[0091] In this embodiment of the disclosure, the braking force of the brakes is monitored alternately. That is, after the elevator has run for the next time, the braking force of another set of brakes is detected according to the above operation, thereby realizing the monitoring of the braking force of a single set of brakes and achieving the purpose of safety redundancy.

[0092] Figure 5 A flowchart illustrating a method for monitoring the braking force of two sets of elevator brakes according to an embodiment of the present disclosure is shown.

[0093] like Figure 5 As shown, the method for monitoring the braking force of the two sets of elevator brakes in this embodiment includes operations S410 to S450.

[0094] When operating S410, at the end of the elevator operation, control the two sets of brakes to be tested to close.

[0095] In operation S420, the inverter output torque is reduced according to a preset slope and / or reduced to zero according to a preset curve. In operation S430, the inverter monitors the motor displacement or speed via the motor encoder signal.

[0096] The technical solutions and principles for operating S420 and S430 can be found in [reference needed]. Figure 3 The operation S320 shown will not be described in detail again.

[0097] If the motor displacement or speed exceeds the preset threshold when operating S440, it is determined that the braking force of the two sets of brakes is unqualified, and a safe stopping strategy is executed.

[0098] The technical solution and principles of this operation can be found in [link to relevant documentation]. Figure 3 The operation S330 shown will not be described in detail.

[0099] When operating S450, if the motor displacement or speed is less than the preset threshold, it is determined that the braking force of the two sets of brakes is qualified, and the frequency converter sends the brake test completion signal to the controller.

[0100] In one example, the elevator controller determines that the braking force of the two sets of brakes is insufficient, and the elevator is in standby mode. Since monitoring the braking force of two sets of brakes is simpler than monitoring the braking force of a single set; and considering that approximately 50% of elevator operation is under no-load conditions, and the elevator's balance coefficient is approximately 50%, monitoring the braking force of both sets of brakes at the end of each normal operation can ensure that both sets of brakes can stop the car with its rated load; therefore, monitoring the braking force of two sets of brakes is generally the preferred method.

[0101] The elevator brake force monitoring method provided in this embodiment monitors the brake force alternately at the end of the elevator's normal operation. By controlling the brake under test to close, the inverter output torque is gradually reduced, and the motor displacement is monitored to determine whether the brake force of the brake under test is qualified. The monitoring method provided in this embodiment monitors the brake force without affecting the safe operation of the elevator, realizing self-monitoring of the brake force. The method provided in this embodiment is implemented by software control algorithm, without the need to add additional electrical devices. It ensures the real-time performance inspection of the brake without increasing costs, and greatly improves the safety redundancy of the elevator braking system.

[0102] Based on the above-described method for monitoring the braking force of elevator brakes, this disclosure also provides a device for monitoring the braking force of elevator brakes. The following will be combined with... Figure 6 The device is described in detail.

[0103] Figure 6 A schematic block diagram of a monitoring device for the braking force of an elevator brake according to an embodiment of the present disclosure is shown.

[0104] like Figure 6 As shown, the elevator brake force monitoring device 600 of this embodiment includes a control module 610, a monitoring module 620, a first determination module 630, and a second determination module 640.

[0105] The control module 610 is used to control the brake under test to close at the end of the elevator operation. In one embodiment, the control module 610 can be used to perform the operation S210 described above, which will not be repeated here.

[0106] The monitoring module 620 is used to gradually reduce the inverter output torque to the minimum holding torque and monitor the displacement of the first motor. In one embodiment, the monitoring module 620 can be used to perform the operation S220 described above, which will not be repeated here.

[0107] The first determining module 630 is used to determine that the braking force of the brake under test is unqualified if the displacement of the first motor is greater than a preset threshold, and to send a fault signal to the controller and execute a safety control strategy. In one embodiment, the first determining module 630 can be used to execute the operation S230 described above, which will not be repeated here.

[0108] The second determining module 640 is used to determine that the braking force of the brake under test is qualified if the displacement of the first motor is less than a preset threshold, control another set of brakes to close, and end the brake force monitoring. In one embodiment, the second determining module 640 can be used to perform the operation S240 described above, which will not be repeated here.

[0109] According to embodiments of this disclosure, any plurality of modules among the control module 610, monitoring module 620, first determining module 630, and second determining module 640 may be combined into one module, or any one of these modules may be split into multiple modules. Alternatively, at least a portion of the functionality of one or more of these modules may be combined with at least a portion of the functionality of other modules and implemented in one module. According to embodiments of this disclosure, at least one of the control module 610, monitoring module 620, first determining module 630, and second determining module 640 may be at least partially implemented as hardware circuitry, such as a field-programmable gate array (FPGA), a programmable logic array (PLA), a system-on-a-chip, a system-on-a-substrate, a system-on-package, an application-specific integrated circuit (ASIC), or implemented in hardware or firmware by any other reasonable means of integrating or packaging the circuitry, or implemented in any one of the three implementation methods of software, hardware, and firmware, or in a suitable combination of any of these. Alternatively, at least one of the control module 610, monitoring module 620, first determining module 630 and second determining module 640 may be at least partially implemented as a computer program module, which can perform corresponding functions when the computer program module is run.

[0110] Figure 7 A block diagram schematically illustrates an electronic device suitable for implementing a method for monitoring the braking force of an elevator brake according to an embodiment of the present disclosure.

[0111] like Figure 7 As shown, an electronic device 500 according to an embodiment of the present disclosure includes a processor 501, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 502 or a program loaded from a storage portion 508 into a random access memory (RAM) 503. The processor 501 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or an associated chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 501 may also include onboard memory for caching purposes. The processor 501 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of the present disclosure.

[0112] RAM 503 stores various programs and data required for the operation of electronic device 500. Processor 501, ROM 502, and RAM 503 are interconnected via bus 504. Processor 501 performs various operations of the method flow according to embodiments of the present disclosure by executing programs in ROM 502 and / or RAM 503. It should be noted that the programs may also be stored in one or more memories other than ROM 502 and RAM 503. Processor 501 may also perform various operations of the method flow according to embodiments of the present disclosure by executing programs stored in said one or more memories.

[0113] According to embodiments of this disclosure, the electronic device 500 may further include an input / output (I / O) interface 505, which is also connected to a bus 504. The electronic device 500 may also include one or more of the following components connected to the I / O interface 505: an input section 506 including a keyboard, mouse, etc.; an output section 507 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN card, modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the I / O interface 505 as needed. A removable medium 511, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 510 as needed so that computer programs read from it can be installed into the storage section 508 as needed.

[0114] This disclosure also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or it may exist independently and not assembled into the device / apparatus / system. The computer-readable storage medium carries one or more programs that, when executed, implement the method according to the embodiments of this disclosure.

[0115] According to embodiments of this disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium, such as, but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this disclosure, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. For example, according to embodiments of this disclosure, the computer-readable storage medium may include ROM 502 and / or RAM 503 and / or one or more memories other than ROM 502 and RAM 503 described above.

[0116] Embodiments of this disclosure also include an elevator device comprising, as shown in the figure below. Figure 6 The elevator brake force monitoring device shown performs the elevator brake force monitoring method provided in the embodiments of this disclosure.

[0117] Embodiments of this disclosure also include a computer program product comprising a computer program containing program code for performing the methods shown in the flowchart. When the computer program product is run on a computer system, the program code enables the computer system to implement the elevator brake braking force monitoring method provided in the embodiments of this disclosure.

[0118] When the computer program is executed by the processor 501, it performs the functions defined in the system / apparatus of this disclosure embodiments. According to embodiments of this disclosure, the systems, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0119] In one embodiment, the computer program may rely on a tangible storage medium such as an optical storage device or a magnetic storage device. In another embodiment, the computer program may also be transmitted and distributed in the form of signals over a network medium, and may be downloaded and installed via the communication section 509, and / or installed from a removable medium 511. The program code contained in the computer program can be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination thereof.

[0120] In such an embodiment, the computer program can be downloaded and installed from a network via communication section 509, and / or installed from removable medium 511. When the computer program is executed by processor 501, it performs the functions defined in the system of this disclosure embodiment. According to embodiments of this disclosure, the systems, devices, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0121] According to embodiments of this disclosure, program code for executing the computer programs provided in embodiments of this disclosure can be written in any combination of one or more programming languages. Specifically, these computational programs can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, languages ​​such as Java, C++, Python, "C", or similar programming languages. The program code can execute entirely on the user's computing device, partially on the user's device, partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0122] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0123] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0124] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A method for monitoring the braking force of an elevator brake, characterized in that, include: Obtain the actual load of the car and the configuration parameters of the elevator traction system, wherein the configuration parameters of the elevator traction system include the rated load of the car, the diameter of the traction sheave, and the system traction ratio; The minimum holding torque is determined based on the actual load of the car, the rated load of the car, the diameter of the traction sheave, and the traction ratio of the system. At the end of the normal elevator operation, control the brake to be tested to close; The inverter output torque is gradually reduced to the minimum holding torque according to a preset slope or preset curve, and the displacement of the first motor is monitored. If the displacement of the first motor is greater than the preset threshold, it is determined that the braking force of the brake under test is unqualified, a fault signal is sent to the controller and a safety control strategy is executed. as well as If the displacement of the first motor is less than a preset threshold, the braking force of the brake under test is determined to be qualified, and the other set of brakes is controlled to close, thus ending the brake force monitoring.

2. The monitoring method according to claim 1, characterized in that, The execution security control strategy includes: Control the closure of another set of brakes; The output torque of the frequency converter is gradually reduced to zero, and the displacement of the second motor is monitored. If the displacement of the second motor is greater than the preset threshold, it is determined that the braking force of both sets of brakes on the elevator is unqualified, and a safe stopping strategy is executed; and If the displacement of the second motor is less than the preset threshold, it is determined that there is a set of brakes in the elevator that have unqualified braking force, and the elevator is controlled to stop running.

3. The monitoring method according to claim 2, characterized in that, The implementation of the safe docking policy includes: The inverter outputs a holding torque to keep the elevator car at the current floor position. The elevator's direction of travel is determined based on the weight of the car's side and the weight of the counterweight; and Once the elevator reaches the terminal station, control the elevator to stop.

4. The monitoring method according to claim 3, characterized in that, The method of determining the elevator running direction based on the car's side gravity and the counterweight's side weight includes: When it is determined that the weight on the car side is less than the weight on the counterweight side, the elevator's direction of travel is determined to be from the current floor to the top floor; and When it is determined that the weight on the car side is less than the weight on the counterweight side, the elevator's running direction is determined to be from the current floor position to the ground floor.

5. The monitoring method according to any one of claims 1 to 4, characterized in that, The monitored motor displacement includes: The motor displacement is obtained through a motor encoder.

6. A device for monitoring the braking force of an elevator brake, comprising: The minimum holding torque determination module is used to obtain the actual load of the car and the configuration parameters of the elevator traction system, wherein the configuration parameters of the elevator traction system include the rated load of the car, the diameter of the traction sheave, and the system traction ratio; and to determine the minimum holding torque based on the actual load of the car, the rated load of the car, the diameter of the traction sheave, and the system traction ratio. The control module is used to control the closure of the brake under test at the end of the elevator operation. The monitoring module is used to gradually reduce the inverter output torque to the minimum holding torque according to a preset slope or preset curve, and to monitor the displacement of the first motor. The first determining module is used to determine that the braking force of the brake under test is unqualified if the displacement of the first motor is greater than a preset threshold, and to send a fault signal to the controller and execute a safety control strategy. The second determining module is used to determine that the braking force of the brake under test is qualified if the displacement of the first motor is less than a preset threshold, control another set of brakes to close, and end the brake force monitoring.

7. An elevator device, comprising: The elevator brake force monitoring device as described in claim 6, wherein the elevator brake force monitoring device performs the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to perform the method according to any one of claims 1 to 5.

9. A computer program product comprising a computer program that, when executed by a processor, implements the method according to any one of claims 1 to 5.

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