Method and device for detecting the performance of an elevator brake and elevator brake

Abstract

The application discloses an elevator brake performance detection method and device and an elevator brake. The elevator brake comprises an electromagnet for providing an electromagnetic force, and in a braking state, the elevator car is stopped by removing the electromagnetic force and providing a braking force to an elevator power device. The elevator brake performance detection method comprises the following steps: A. controlling the input voltage or current of the electromagnet, so that the elevator brake enters the braking state and records the current data trajectory of the electromagnet based on time characteristics; B. determining a first target point and a second target point in the current data trajectory according to the current data trajectory, which are respectively a first peak point and a starting point where the current value changes from decreasing to increasing in the current data trajectory; and C. calculating the time difference between the first target point and the second target point as the braking time of the elevator brake. The application has high practicability and can effectively enhance the safety and reliability of the elevator.

Description

Technical Field

[0001] This invention relates to the field of elevator technology, and in particular to a method for testing the performance of elevator brakes, a device for testing the performance of elevator brakes, and an elevator brake itself. Background Technology

[0002] The elevator brake is a safety braking device in an elevator, playing a crucial role in ensuring the safe operation of the elevator and the personal safety of passengers. Figure 1 The image shows a conventional elevator system 100, in which the elevator power unit 20 (such as a traction machine), elevator brake 10, and other equipment are typically housed in the elevator machine room 400. The elevator power unit 20 is connected to the elevator car 200 via ropes 300, providing power to the latter to drive it up and down within the elevator shaft. The elevator is stopped at the passenger's target floor by operating the elevator brake. Figure 1 The symbols Fa, Fb, or Fc shown are examples of these. Furthermore, in cases of elevator malfunction or emergency, the elevator car can be safely braked using the elevator brake system.

[0003] Currently, numerous types of elevator brakes have been designed and supplied. For example... Figure 2 In the example described, the elevator brake mainly includes a fixed part 1 and a moving part 2. The latter can move relative to the former according to operational needs, and the movement path of the moving part 2 can be guided by guide components (such as guide sleeves, bolts, pins, etc.). The fixed part 1 can be fixed in the elevator machine room 400, and a force F1 is provided by a component 5 (such as a spring) arranged between the fixed part 1 and the moving part 2 to drive the moving part 2 to move away from the fixed part 1. This allows the friction component 4 on the moving part 2 to contact the braking component 6 (such as a wheel, turntable, etc.) associated with the elevator power unit 20 and provide braking force, thereby stopping the elevator power unit 20 from outputting power and achieving the purpose of safe braking of the elevator car. In addition, an electromagnetic force F2 opposite to the direction of the force F1 can be applied by an electromagnetic component 3 located at the fixed part 1 to cause the moving part 2 to move towards the fixed part 1, thereby causing the friction component 4 to disengage from the elevator power unit 20, thereby restoring the power output of the elevator power unit 20 and allowing the elevator car to start running again.

[0004] During repeated operations, such as those described above, components of the elevator brake, such as guide sleeves, bolts, and moving parts, may experience wear, rust, cracking, or even complete failure. This will not only affect the working performance of the elevator brake but may also lead to safety risks, such as stuck-at failure, excessive braking time, and failure of braking force, ultimately causing harm to elevator passengers. Summary of the Invention

[0005] In view of this, the present invention provides an elevator brake performance testing method, an elevator brake performance testing device, and an elevator brake, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0006] First, according to one aspect of the present invention, a method for testing the performance of an elevator brake is provided. The elevator brake includes an electromagnetic component for providing electromagnetic force, and in a braking state, the elevator car is stopped by releasing the electromagnetic force and providing braking force to the elevator power unit. The method for testing the performance of the elevator brake includes the following steps:

[0007] A. Control the input voltage or current of the electromagnetic component to make the elevator brake enter the braking state and record the corresponding current data trajectory of the electromagnetic component based on time characteristics;

[0008] B. Based on the current data trajectory, determine a first target point and a second target point, wherein the first target point and the second target point are respectively the first peak point and the starting point where the current value changes from decreasing to increasing in the current data trajectory; and

[0009] C. Calculate the time difference between the first target point and the second target point, and use it as the braking time of the elevator brake.

[0010] Optionally, the elevator brake performance testing method according to the present invention further includes the step of:

[0011] D. Determine whether the braking time is greater than a preset value and whether the segment between the first target point and the second target point in the current data trajectory is smooth, in order to characterize the braking smoothness of the elevator brake.

[0012] In the elevator brake performance testing method according to the present invention, optionally, when at least one peak or valley appears in the section, it is determined that the section is not smooth and the braking smoothness of the elevator brake decreases.

[0013] In the elevator brake performance testing method according to the present invention, optionally, when the braking time is greater than the preset value and the section is not smooth, it is determined that the surface quality of the guide in the elevator brake has decreased. The guide is configured to guide the moving part in the elevator brake to move relative to the fixed part. The electromagnetic element is disposed on the fixed part. The moving part is driven towards the elevator power device in the braking state and contacts the friction element in the moving part to provide the braking force.

[0014] In the elevator brake performance testing method according to the present invention, optionally, the elevator's operating time includes idle periods and busy periods, and step AD is automatically executed during the idle periods at a preset time cycle.

[0015] In the elevator brake performance testing method according to the present invention, optionally, in step A, the input voltage of the electromagnetic component is controlled by gradually reducing the PWM duty cycle of the input voltage.

[0016] Optionally, the elevator brake performance testing method according to the present invention further includes the step of:

[0017] Before performing step A, confirm that the elevator car is currently unloaded; and / or

[0018] After performing step C, output at least a report related to the braking time.

[0019] In the elevator brake performance testing method according to the present invention, optionally, the report information is stored on the elevator's local or cloud server, and / or the report information is sent to a user terminal, the user terminal including the user's mobile communication terminal.

[0020] Furthermore, according to another aspect of the present invention, an elevator brake performance testing device is also provided, the elevator brake including an electromagnetic component for providing electromagnetic force, and in a braking state, stopping the elevator car by releasing the electromagnetic force and providing braking force to the elevator power unit, the elevator brake performance testing device including a controller configured to perform the following steps:

[0021] A. Control the input voltage or current of the electromagnetic component to make the elevator brake enter the braking state and record the corresponding current data trajectory of the electromagnetic component based on time characteristics;

[0022] B. Based on the current data trajectory, determine a first target point and a second target point, wherein the first target point and the second target point are respectively the first peak point and the starting point where the current value changes from decreasing to increasing in the current data trajectory; and

[0023] C. Calculate the time difference between the first target point and the second target point, and use it as the braking time of the elevator brake.

[0024] In the elevator brake performance testing device according to the present invention, the controller is optionally further configured to perform the following steps:

[0025] D. Determine whether the braking time is greater than a preset value and whether the segment between the first target point and the second target point in the current data trajectory is smooth, in order to characterize the braking smoothness of the elevator brake.

[0026] In the elevator brake performance testing device according to the present invention, the controller is optionally further configured to: when at least one peak or valley appears in the section, determine that the section is not smooth and the braking smoothness of the elevator brake decreases.

[0027] In the elevator brake performance testing device according to the present invention, optionally, the controller is further configured to: when the braking time is greater than the preset value and the section is not smooth, determine that the surface quality of the guide in the elevator brake has decreased, the guide is configured to guide the moving part in the elevator brake to move relative to the fixed part, the electromagnetic element is disposed on the fixed part, and the moving part is driven towards the elevator power device in the braking state and contacts the friction element in the moving part to provide the braking force.

[0028] In the elevator brake performance testing device according to the present invention, optionally, the elevator's operating time includes idle periods and busy periods, and the controller is further configured to automatically execute step AD during the idle periods at a preset time cycle.

[0029] In the elevator brake performance testing device according to the present invention, optionally, the controller is configured to control the input voltage of the electromagnetic component by gradually reducing the PWM duty cycle of the input voltage.

[0030] In the elevator brake performance testing device according to the present invention, the controller is optionally further configured to perform the following steps:

[0031] Before performing step A, confirm that the elevator car is currently unloaded; and / or

[0032] After performing step C, output at least a report related to the braking time.

[0033] In the elevator brake performance testing device according to the present invention, optionally, the controller is further configured to: store the report information on a local or cloud server of the elevator, and / or send the report information to a user terminal, the user terminal including the user's mobile communication terminal.

[0034] In addition, according to another aspect of the present invention, an elevator brake is provided, the elevator brake being equipped with an elevator brake performance testing device as described in any of the above claims.

[0035] The principles, features, characteristics, and advantages of the various technical solutions according to the present invention will become clear from the following detailed description in conjunction with the accompanying drawings. For example, applying the solutions of the present invention enables automated, low-cost, efficient, and accurate evaluation and assessment of the current operating characteristics of elevator brakes (e.g., braking time, jamming problems, etc.), thereby helping to understand the system status in a timely manner, significantly reducing the cost of manual on-site inspection and maintenance, promoting timely and accurate stocking of spare parts, achieving a substantial reduction in elevator maintenance expenses, reducing safety accidents, and effectively enhancing the safety and reliability of the elevator system. The present invention has significant practicality and very high application value. Attached Figure Description

[0036] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are intended to conceptually illustrate the structural construction described herein, and are not necessarily drawn to scale.

[0037] Figure 1 This is a structural diagram of an existing elevator system, which shows both an example of an elevator power unit and an example of an elevator brake.

[0038] Figure 2 This is a schematic diagram of the basic structure and working principle of an existing elevator brake.

[0039] Figure 3 yes Figure 2 A partial side view of the elevator brake example shown.

[0040] Figure 4 This is a schematic flowchart of an embodiment of the elevator brake performance testing method according to the present invention.

[0041] Figure 5 This is a schematic flowchart of another embodiment of the elevator brake performance testing method according to the present invention.

[0042] Figure 6 The figure also shows a curve comparison obtained by testing two different elevator brake examples using an embodiment of the elevator brake performance testing method according to the present invention. The corresponding electromagnetic component input voltage PWM duty cycle control curve is also shown in the figure.

[0043] Figure 7 and Figure 8 They are Figure 6 The graphs for the two different elevator brake examples shown are shown. Detailed Implementation

[0044] First, it should be noted that the following will be illustrated by way of example the elevator brake performance testing method, elevator brake performance testing device, and elevator brake steps, composition, features, and advantages of the present invention; however, all descriptions should not be construed as limiting the present invention in any way.

[0045] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the accompanying drawings, the present invention still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle. Therefore, these further embodiments according to the present invention should be considered within the scope of this description. Additionally, for the sake of brevity, general matters already known to those skilled in the art, such as the basic structure and working principle of elevator power units and elevator brakes, will not be elaborated upon herein.

[0046] According to the design concept of this invention, a method for testing the performance of an elevator brake is first provided. This method can be used to detect and understand the performance of the elevator brake, such as its braking time, braking smoothness, and the operating status of its components. Please refer to [reference needed]. Figure 4 The present invention provides an exemplary processing flow according to an embodiment of the method, which may specifically include the following steps:

[0047] First, in step S11, the elevator brake can be controlled to enter a braking state (also commonly referred to as the "stopped brake state"). Specifically, by controlling the voltage or current supplied to the electromagnetic component in the elevator brake, for example by gradually and slowly reducing the voltage or current, the elevator brake can be brought into a braking state, and the current data trajectory of the electromagnetic component during this process can be recorded. This current data trajectory will have time characteristics, that is, it can represent the change of the working current I of the electromagnetic component with time T during the braking process of the elevator brake. This is achieved, for example, by... Figure 7 and Figure 8 The curves X shown in the examples illustrate this. The voltage, current, and other data for the electromagnetic components can be obtained through various means. For instance, as operating data for elevator equipment, they can be obtained directly from existing elevator brakes, separately installed detection devices (such as voltage sensors, current sensors, etc.), or control units, modules, equipment, or operation management systems within the elevator system.

[0048] In the above steps, various feasible methods can be used to control the electromagnetic components. For example, as an illustration, the duty cycle of the PWM (Pulse Width Modulation) of the electromagnetic component's input voltage can be gradually reduced (see [reference]). Figure 7The curve Y shown in the diagram, or any other suitable control method, is used to control the output electromagnetic force of the electromagnetic component. Combined with... Figure 2 and Figure 3 For example, an electromagnetic field M can be generated and an electromagnetic force F2 can be output by controlling the input voltage of the electromagnetic component 3 in the elevator brake. This electromagnetic force F2 is opposite in direction to the force F1 applied to the moving part 2 by component 5. Once the electromagnetic force F2 is released (for example, by de-energizing the electromagnetic component 3), the moving part 2 will move towards the brake component 6 along the guiding direction of the guide components 7 (such as bolts, pins, etc.), guide sleeves 8, etc., under the push of the force F1, so that the friction component 4 and the brake component 6 come into contact. Then, a braking force can be applied to the brake component 6, thereby causing the elevator power unit to enter the braking state and stop outputting power to the outside, thereby stopping the elevator car.

[0049] It should be noted that, regarding the electromagnetic components, the specific structure, composition, arrangement, and installation method within the elevator brake are subject to flexible configuration and selection based on actual application requirements; that is, no specific restrictions are imposed. As an example, in some embodiments, one or more winding coils can be conveniently selected and arranged circumferentially along the fixed portion. For instance, four or six winding coils can be evenly arranged along the circumference of the fixed portion. This not only helps to provide and apply electromagnetic force more evenly but also provides a certain degree of redundancy, thereby improving the safety and reliability of the elevator brake.

[0050] Furthermore, the control input for electromagnetic components can be achieved by setting up a corresponding PWM control module in the elevator brake or in the control part of the elevator system used to control the operation of the elevator brake (such as the elevator frequency converter or additional control circuit boards and other hardware and software), or by adding an additional circuit board with PWM control function. This allows for the convenient implementation of any suitable control method, such as the input voltage PWM duty cycle mentioned above.

[0051] Continue to refer to Figure 4 and Figure 6-8 In step S12, the first target point and the second target point can be determined from the current data trajectory obtained in step S11. These represent the first peak point (e.g., the peak point in the current data trajectory) in the current data trajectory. Figure 7 Peak point P1 in Figure 8 The peak point Q1 in the current data trajectory), the starting point where the current value changes from decreasing to increasing (e.g., the peak point Q1 in the current data trajectory), and the starting point where the current value changes from decreasing to increasing (e.g., the peak point Q1 in the current data trajectory). Figure 7 The starting point P2 in Figure 8(The starting point Q2 in the data). Based on the aforementioned characteristics of the first and second target points, they can be easily identified from the current value points contained in the current data trajectory, for example, by using data algorithm processing.

[0052] Then, in step S13, the time difference between the two target points in the current data trajectory can be calculated, that is, the time difference between the first target point and the second target point. Since this time difference data can accurately reflect the actual time taken for the elevator brake to complete the braking operation, it can be used as the braking time of the elevator brake (also often called the "brake-down time," etc.). This definition is theoretically supported by Lenz's law in electromagnetism. As one of the basic performance parameters, the braking time obtained above can accurately reflect the current working performance of the elevator brake, and this braking time can be further provided for various applications in elevator systems or other systems.

[0053] Compared with the solution of the present invention, since the existing elevator brakes usually place the detection point of the brake switch at the middle position of the air gap S between the fixed part and the moving part, the use of the brake switch signal as the basis for judging the braking time in some existing technologies is not accurate enough. This will lead to a deviation from the actual braking time and may bring undesirable adverse effects.

[0054] by Figure 7 and Figure 8 Taking the scenario shown as an example, the following illustrative explanation will continue. In Figure 7 In the diagram, the peak point P1 and the starting point P2 are represented in the coordinate system (the horizontal axis represents time T in seconds, and the vertical axis represents current I in milliamperes). Figure 8 Similarly, the coordinates in the equations are (29.75, 431) and (29.64, 228), respectively. Therefore, the braking time of the elevator brake is 29.75 - 29.64 = 0.11 seconds. Figure 8 In the diagram, the peak point Q1 and the starting point Q2 have coordinates of (27.48, 481) and (27.28, 295) respectively in the coordinate system. Therefore, the braking time of the elevator brake is 27.48 - 27.28 = 0.20 seconds. Through the above processing, it can be found that if the set standard is met (e.g., the braking time is required to be less than 0.15 seconds), then... Figure 7 The corresponding elevator brake currently has good performance, and Figure 8 The corresponding elevator brakes do not meet the standards, so it is necessary to take timely measures to solve the above problems.

[0055] See again Figure 5The figure shows a general processing flow of another embodiment of the elevator brake performance testing method according to the present invention. Unless otherwise specified herein, in... Figure 5 Zhongyu Figure 4 For steps S21-S23 that are the same or similar, please refer directly to the above information. Figure 4 The corresponding descriptions of steps S11-S13 in the example.

[0056] exist Figure 5 The document also shows step S24. Specifically, in this embodiment of the elevator brake performance testing method, it can further determine whether the braking time obtained in step S23 is greater than a preset value (which can be set or adjusted according to actual application needs, such as 0.15 seconds, 0.16 seconds, 0.18 seconds, etc.), and whether the segment in the current data trajectory recorded in step S21 that is between the first target point and the second target point (e.g., Figure 7 Segment X1 in Figure 8 Whether the segment X2 in the middle is smooth is used to characterize the braking smoothness of the elevator brake (or "brake-down smoothness", etc.), which can reflect the current working performance of the elevator brake.

[0057] As an example, a comparison can be made to find that... Figure 7 In the example, segment X1 is very smooth overall, while... Figure 8 In section X2, there are more obvious fluctuations and undulations, that is, in Figure 8 The portion marked with numeral A in the attached diagram exhibits discontinuous and anomalous shapes, such as sharp peaks or valleys, which results in segment X2 being unsmooth. Thus, it can be determined that... Figure 8 The corresponding elevator brake has exhibited a decrease in braking smoothness. This can be caused by various reasons, such as rust, wear, cracks, or corrosion affecting components within the elevator brake (e.g., guide sleeves, bolts, and moving parts in contact with the guide sleeves). This will ultimately negatively impact the elevator brake's performance, creating safety hazards or risks. For instance, the aforementioned unevenness discovered during testing may be due to a decline in the surface quality of guide components such as guide sleeves during use (e.g., rust, localized damage, cracks), which could lead to braking delays or jamming malfunctions.

[0058] By applying the method of this invention, the above-mentioned problems can be detected preventively and early, and it is not necessary to send personnel to the elevator brake site for inspection. This helps to take quick and efficient countermeasures, promote the timely and accurate preparation, repair and replacement of parts, effectively reduce elevator maintenance costs and other expenses, and significantly enhance the safety performance and management service level of the elevator system.

[0059] Furthermore, it is understandable that for a specific type of elevator brake product, since its basic structure, components, overall condition, advantages and disadvantages are relatively familiar to technical personnel, once the method of this invention is applied to discover that the elevator brake product has a decrease in braking smoothness, they can quickly locate the specific part or component in the elevator brake product, thereby quickly solving such problems and effectively avoiding subsequent unwanted equipment failures or safety accidents.

[0060] It should be understood that the above embodiments are merely illustrative examples. Without departing from the spirit of the invention, the method of the present invention allows for more possible settings, changes and adjustments according to different application requirements, and no restrictions are made on these aspects.

[0061] For example, as an alternative, a step to confirm whether the elevator car is currently unloaded can be added before step S11 (or S21). That is, steps S11-S13 (or S21-S24) are only executed if it is determined that the elevator car is suitable for the detection operation, thereby helping to enhance the safety of the entire detection operation.

[0062] For example, as an alternative, after executing step S13 (or S24), a report related to the learned performance of the elevator brake (such as braking time, braking smoothness, guide surface quality, etc.) can be output. This report can be stored on the elevator's local or cloud server so that elevator operation managers, equipment maintenance personnel, equipment manufacturers, or parts suppliers can access it promptly. It is understood that those skilled in the art can flexibly configure the specific content, expression, transmission path, and level of the report information according to actual needs.

[0063] For example, in some applications, report information can be sent to user terminals (such as mobile phones and tablets) via text prompts or voice alerts, enabling users to promptly understand the working performance status of the elevator brake. This allows for preventative measures such as arranging for personnel to replace parts (such as guide sleeves) and procuring spare parts in advance, ensuring the long-term safe and reliable operation of the elevator system. Furthermore, in some applications, multiple safety measures can be used individually or in combination, such as controlling the elevator to stop operation and sending report information to user terminals, to achieve safety precautions and timely warnings.

[0064] Furthermore, it should be noted that the method of the present invention can be implemented as needed. It can be executed once at any suitable time, or it can be implemented automatically using a preset time cycle (such as once every five days, once a week, once every two weeks, etc.). For example, as an alternative, the elevator's operating time can be divided into busy periods (such as daytime working hours on weekdays) and idle periods (such as late night periods on weekdays (such as 00:00-3:00, 01:00-2:00, etc.), or only late night periods on non-working days can be considered). Then, the method of the present invention can be automatically executed only during the aforementioned idle periods at a preset time cycle, so as to automatically track and monitor the performance status of the elevator brake throughout the entire process, without causing any adverse effects on the normal operation and use of the elevator.

[0065] As another aspect that is clearly superior to the prior art, the present invention also provides an elevator brake performance testing device, wherein a controller is provided to perform various possible steps according to the method of the present invention, including, for example, those discussed above, and the elevator brake performance testing device can be manufactured and sold separately.

[0066] It is understood that, based on the disclosure of this application, those skilled in the art can implement the aforementioned controller in the elevator brake performance testing device using processors, electronic circuits, integrated circuits (ASICs), and / or memories for executing one or more software or firmware programs, combinational logic circuits, and any other suitable components. Furthermore, since the foregoing has already described in great detail the various specific steps, implementation methods, and usage scenarios of the elevator brake, electromagnetic component's input voltage, input current, and current data trajectory processing, the specific descriptions in the corresponding sections can be directly consulted, and will not be repeated here.

[0067] Furthermore, according to the technical solution of the present invention, an elevator brake is also provided. Specifically, the elevator brake can be equipped with an elevator brake performance detection device designed and provided according to the present invention, thereby enabling automated, convenient, efficient and accurate detection of the current working performance status of the elevator brake, and significantly reducing elevator maintenance costs, achieving the significant technical advantages mentioned above. Therefore, it has very high practical value and creates considerable economic benefits.

[0068] The above examples illustrate, by way of illustration, the elevator brake performance testing method, the elevator brake performance testing device, and the elevator brake according to the present invention. These examples are only for illustrating the principles and implementation methods of the present invention and are not intended to limit the invention. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should fall within the scope of the present invention and be defined by the claims of the present invention.

Claims

1. An elevator brake performance detection method, the elevator brake including an electromagnet for providing an electromagnetic force, and stopping an elevator car in a braking state by canceling the electromagnetic force and providing a braking force to an elevator power device, characterized by, comprising the steps of: A. controlling input voltage or current of the electromagnet to make the elevator brake enter the braking state and record corresponding current data trajectory of the electromagnet based on time characteristics; B. determining a first target point and a second target point in the current data trajectory according to the current data trajectory, the first target point and the second target point being respectively a first peak point in the current data trajectory and a starting point where current value changes from decreasing to increasing; and C. calculating time difference between the first target point and the second target point as braking time of the elevator brake.

2. The elevator brake performance detection method according to claim 1, wherein further comprising the steps of: D. judging whether the braking time is greater than a preset value and whether a section between the first target point and the second target point in the current data trajectory is smooth, to represent braking smoothness of the elevator brake.

3. The elevator brake performance detection method according to claim 2, wherein, when at least one peak or valley appears in the section, it is determined that the section is not smooth and the braking smoothness of the elevator brake is decreased.

4. The elevator brake performance detection method of claim 2, wherein, when the braking time is greater than the preset value and the section is not smooth, it is determined that surface quality of a guide in the elevator brake is decreased, the guide being arranged to guide movement of a moving part relative to a fixed part, the electromagnet being arranged on the fixed part, the moving part being driven to move towards the elevator power device in the braking state and contacting a friction part in the moving part to provide the braking force.

5. The elevator brake performance detection method of claim 2, wherein, operation time of the elevator includes an idle period and a busy period, steps A-D are automatically performed in the idle period with a preset time period.

6. The elevator brake performance detection method of claim 1, wherein, in step A, input voltage of the electromagnet is controlled by gradually reducing PWM duty cycle of the input voltage.

7. The elevator brake performance detection method of claim 1, wherein, further comprising the steps of: before step A is performed, it is confirmed that the elevator car is currently in an empty state; and / or after step C is performed, report information related to at least the braking time is output.

8. The elevator brake performance detection method of claim 7, wherein, the report information is stored in a local or cloud server of the elevator, and / or the report information is sent to a user terminal including a mobile communication terminal of a user.

9. An elevator brake performance detection device of an elevator brake including an electromagnet for providing an electromagnetic force and stopping an elevator car in a braking state by canceling the electromagnetic force and providing a braking force to an elevator power device, characterized by, the elevator brake performance detection device includes a controller arranged to perform the following steps: A. controlling input voltage or current of the electromagnet to make the elevator brake enter the braking state and record corresponding current data trajectory of the electromagnet based on time characteristics; B. determining a first target point and a second target point in the current data trajectory according to the current data trajectory, the first target point and the second target point being respectively a first peak point in the current data trajectory and a starting point where current value changes from decreasing to increasing; and C. calculating time difference between the first target point and the second target point as braking time of the elevator brake.

10. The elevator brake performance detection apparatus according to claim 9, wherein the controller is further arranged to perform the following steps: D. judging whether the braking time is greater than a preset value and whether a section between the first target point and the second target point in the current data trajectory is smooth, to represent braking smoothness of the elevator brake.

11. The elevator brake performance detection apparatus according to claim 10, wherein, The controller is further configured to determine that the section is not smooth and the braking smoothness of the elevator brake is decreased when at least one peak or valley occurs in the section.

12. The elevator brake performance detection apparatus according to claim 10, wherein, The controller is further configured to determine that the guide surface quality in the elevator brake is decreased when the braking time has been greater than the preset value and the section is not smooth, the guide being configured to guide a moving part in the elevator brake to move relative to a fixed part on which the electromagnetic member is arranged, the moving part being driven to move towards the elevator power device in the braking state and to contact the moving part by a friction member in the moving part to provide the braking force.

13. The elevator brake performance detection apparatus according to claim 10, wherein, The operation time of the elevator includes an idle period and a busy period, and the controller is further configured to automatically perform steps A-D in the idle period with a preset time period.

14. The elevator brake performance detection apparatus according to claim 9, wherein, The controller is configured to control the input voltage of the electromagnetic member by gradually reducing the PWM duty cycle of the input voltage.

15. The elevator brake performance detection apparatus according to claim 9, wherein, The controller is further configured to perform the following steps: Before performing step A, it is confirmed that the elevator car is currently in an empty state; and / or After performing step C, report information related to at least the braking time is output.

16. The elevator brake performance detection apparatus of claim 15, wherein, The controller is further configured to store the report information in a local or cloud server of the elevator, and / or send the report information to a user terminal, the user terminal including a mobile communication terminal of a user.

17. An elevator brake characterized by The elevator brake is configured with the elevator brake performance detection device according to any one of claims 9-16.

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