Dynamic parameter measuring instrument for elevator brake

Abstract

A dynamic parameter measuring instrument for an elevator brake relates to the technical field of special equipment elevator inspection and is used for measuring trigger time in a brake test process, speed of a traction wheel and a steel wire rope during triggering, maximum speed / distance / deceleration in a brake process and brake response time. In the dynamic parameter measuring instrument for the elevator brake, a rotary encoder tachometer wheel of a measuring device is fixed with a magnetic attraction base through a bracket, and is in contact with an elevator traction wheel and a steel wire rope between the traction wheel and a guide wheel; a Hall sensor of the power-off monitoring device is used for collecting a current signal in a brake circuit or a safety loop at an elevator control cabinet; during a brake test, when a Hall sensor acquires a current signal in a brake circuit or a safety loop at an elevator control cabinet, the current signal is suddenly changed into 0, the current signal is a timing starting point of the brake test, and important time data is provided for data analysis and processing of subsequent brake parameters; and the measurement host communicates with the operation terminal through wireless communication.

Description

Technical Field

[0001] The utility model relates to the technical field of special equipment elevator inspection, in particular to an elevator brake dynamic parameter measuring instrument. Background Art

[0002] At present, Article 3.5 of GB / T 24478 Elevator Traction Machine defines the brake response time; Article 4.2.2.3 stipulates a clear numerical value (not exceeding 0.5S) for the brake response time, and Article 5.8 proposes a measurement method for the brake response time on a factory bench. However, it is very difficult to measure the brake response time of elevator brakes in use.

[0003] In the prior art, a first type of elevator brake braking response time detection device is disclosed, which includes a brake power supply voltage, a microswitch, a brake electromagnet, a brake arm and a brake hub, wherein the brake electromagnet is connected to the brake power supply voltage, microswitches are respectively provided on both sides of the brake electromagnet, the two sides of the brake electromagnet are respectively connected to the brake arms, and the brake arms on both sides are respectively arranged on both sides of the brake hub, the brake arms on both sides are connected by compression springs, which are used to close the brake arms by compression springs, the brake power supply voltage and the microswitch are respectively connected to the CPU, which are used to measure the brake power supply voltage off-time t1 and the brake reaching the full braking position time t2.

[0004] However, the inventor of the present application has found that the above-mentioned elevator brake response time detection device has the following main defects:

[0005] (1) The response time of the brake in this device is that the brake power supply voltage and the micro switch are connected to the CPU respectively, which are used to measure the power-off time t1 of the brake power supply voltage and the time t2 when the brake reaches the full braking position. That is, time t1 is the time when the brake circuit is powered off (the voltage is zero), and time t2 is the action time of the micro switch installed on the brake. However, due to the randomness of the installation of the micro switch, the distance between the brake micro switches on both sides of the same traction machine may be inconsistent. In addition, the micro switch itself has a travel, and the travel of micro switches from different manufacturers or different models is usually inconsistent. Therefore, the measurement error of the response time of this brake is large;

[0006] (2) There is a big deviation in their understanding of brake response time; brake response time is the time from when the brake is powered off to when the braking torque reaches the rated value (a term specified in GB / T 24478 Elevator Traction Machine 3.5). The parameters that affect the braking torque include the static friction coefficient of the contact surface between the brake shoe and the brake wheel, the diameter of the brake wheel, the stiffness coefficient of the brake spring and the compression amount in the braking state. The reduction of these parameters will lead to a reduction in the braking torque. For example, if the stiffness of the brake spring decreases and the rated braking torque is not reached, the micro switch still operates and the elevator still runs. If the micro switch operation time is used as the end point of the response time, it obviously does not meet the definition of brake response time.

[0007] (3) The device cannot measure the braking performance of the brake, such as the traction sheave speed, car speed, stopping distance, acceleration, etc.;

[0008] (4) The device needs to connect the brake power supply voltage and the micro switch to the CPU respectively. Therefore, the elevator brake circuit and micro switch wiring are disassembled and then connected in series to the CPU of the device. The brake circuit power input voltage is 220V (partially 110V), which poses certain safety hazards (such as ground short circuit faults, etc.). In addition, it also destroys the integrity of the original elevator and is more time-consuming.

[0009] In the prior art, a second simple detection device for measuring the response time of a traction machine brake is disclosed, which includes a box body, a rectifier plate is arranged at the bottom of the inner cavity of the box body, a box cover is connected to the top of the box body by bolts, a voltage regulator, a DC voltmeter, a microcomputer timer, a reset switch, a double-layer switch, a double air switch and an overload protection mechanism are embedded on the top of the box cover, and the overload protection mechanism is located below the voltage regulator, and the top of the overload protection mechanism is connected to an insulating protective cover by bolts; when the power supply of the brake in the double-layer switch is cut off, the double-layer switch gives a timing signal to the microcomputer timer, and at this time, after the brake is in place, the microswitch on the brake is actuated, and the microswitch gives a timing stop signal to the microcomputer timer, and at this time, the microcomputer timer stops working, and the corresponding time of the brake can be known by observing the value on the microcomputer timer.

[0010] However, the inventor of the present application has found that the above-mentioned simple detection device for measuring the response time of the traction machine brake has the following main defects:

[0011] (1) The response time of the brake in the device is: when the power supply of the brake in the double-layer switch is cut off, the double-layer switch gives a timing signal to the microcomputer timer. At this time, after the brake is in place, the microswitch on the brake is actuated, and the microswitch gives a timing stop signal to the microcomputer timer. At this time, the microcomputer timer stops working. The corresponding time of the brake can be known by observing the value on the microcomputer timer. However, due to the randomness of the installation of the microswitch, the distance between the microswitch of the brake on both sides of the same traction machine may be inconsistent. In addition, the microswitch itself has a stroke, and the stroke of microswitches from different manufacturers or different models is usually inconsistent. Therefore, the measurement error of the brake response time is large;

[0012] (2) There is a large deviation in the understanding of brake response time. The specific analysis is consistent with item (2) of the first detection device mentioned above;

[0013] (3) The device cannot measure the braking performance of the brake, such as the traction sheave speed, car speed, stopping distance, acceleration, etc.;

[0014] (4) The voltage regulator, reset switch and double-layer switch in the device are all electrically connected to the traction machine brake power supply and the microcomputer timer. Therefore, there is also a situation where the brake circuit power supply input voltage is 220V (partially 110V), which poses certain safety hazards (such as ground short circuit faults, etc.). In addition, it also destroys the integrity of the original elevator and is more time-consuming.

[0015] In the prior art, a third multi-parameter based dynamic braking performance detector is disclosed, which can detect motion parameters such as speed, braking distance, time, slip amount, etc. during elevator braking, and calculate the remaining life of the elevator by combining the LSTM algorithm with the fully connected mapping model. According to the structural characteristics of the brake, the principle, structure and detection process of the detector are determined; the detector consists of two major parts: a main body and a measuring element. After the data is measured by the sensor, it is connected to the monitoring software on the computer, and various motion data during elevator braking are transmitted to the braking interface of the software for display, and quantitative detection data is obtained. The braking status of the elevator is obtained through the data curve, and a prototype is manufactured. It is shown through experiments that the detection accuracy error of the detector is within 5%, which meets the corresponding use requirements.

[0016] However, the inventor of the present application has found that the above-mentioned multi-parameter-based dynamic brake performance detector has the following main defects:

[0017] (1) The detection system and method do not measure the brake response time;

[0018] (2) The detection system and method do not take into account the situation where the wire rope jumps laterally when the elevator safety clamp is activated, causing the speed measuring wheel to detach from the object being measured. Therefore, there is distortion of the measurement data and a large measurement error, which is mentioned in the article to be within 5%.

[0019] In the prior art, a fourth elevator braking performance and traction performance measurement and analysis system is disclosed, which includes a measuring device, a trigger device and an operating terminal; the measuring device includes two sets of tachometer wheel kits and a measuring host, the tachometer wheel kit includes a magnetic base, a universal connecting rod and a tachometer wheel with a rotary encoder, and the two ends of the universal connecting rod are respectively connected to the magnetic base and the tachometer wheel with a rotary encoder; the tachometer wheel with a rotary encoder is connected to the measuring host through a connecting line; the measuring host is fixed to the elevator host beam by magnetic attraction; the trigger device is connected to the measuring host through a data cable; the operating terminal is wirelessly connected to the measuring host through Bluetooth; the tachometer wheel with a rotary encoder collects data every 0.1s, and the measurement accuracy is high. The disassembly and assembly operations of the entire device are convenient and simple, and the measuring host and the operating terminal use Bluetooth transmission, which is applicable to both machine room elevators and machine room-less elevators.

[0020] However, the inventor of the present application has found that the above elevator braking performance and traction performance measurement and analysis system has the following main defects:

[0021] (1) The position of the speed measuring wheels in the system causes one speed measuring wheel to measure the position of the traction wheel, while the other speed measuring wheel measures the position of the vertical section of the car wire rope. When the elevator speed limiter-safety clamp system is activated (for example, during the brake test, the speed limiter safety clamp is activated), the vertical section of the wire rope will produce lateral (horizontal) jumps, and the speed measuring wheel will be separated from the moving wire rope, resulting in speed measurement distortion;

[0022] (2) The trigger device in this system is a travel switch. When the elevator is running, the trigger device is used to activate the elevator stop device. At this time, the elevator starts to stop. The trigger device transmits the stop signal to the measurement host through the data line. Since the stop switch and the trigger device both have a certain travel, there is a large measurement error when the stop device is manually activated. In addition, the device is related to the trigger speed, and the stop signal has a large error, especially when measuring the brake response time.

[0023] (3) It does not clearly define the measurement of braking response time and the division of braking response time intervals. Utility Model Content

[0024] The purpose of the utility model is to provide an elevator brake dynamic parameter measuring instrument, which is mainly used to measure the trigger time during the brake test, the speed of the traction wheel and the wire rope (or steel belt) when triggered, the maximum speed / distance / deceleration during braking, and the braking response time, and generate a data curve by measuring the parameters, and at the same time determine whether the braking response time meets the (GB / T24478 elevator traction machine) standard requirements and braking performance.

[0025] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0026] An elevator brake dynamic parameter measuring instrument comprises: a measuring device, a power failure monitoring device, a measuring host, and an operating terminal;

[0027] The measuring device comprises: two sets of rotary encoder tachometer wheels with double code channels, a bracket with a universal shaft, and a magnetic base; the rotary encoder tachometer wheels are fixed to the magnetic base through the bracket, and are in contact with the elevator traction wheel and the steel wire rope between the traction wheel and the guide wheel, and the magnetic base is installed at the metal structure between the internal pulleys of the elevator machine room, and is used to measure the motion parameters of the traction wheel and the steel wire rope;

[0028] The power failure monitoring device is composed of a Hall sensor and a conditioning circuit. The Hall sensor is used to collect current signals in the brake circuit or safety circuit of the elevator control cabinet. During the brake test, when the Hall sensor collects that the current signal in the brake circuit or safety circuit of the elevator control cabinet suddenly changes to 0, this is the timing starting point of the brake test, and provides important time data for subsequent data analysis and processing of brake parameters.

[0029] The measuring host comprises: a microprocessor, a data storage unit, a power management module, an ADC conversion module, and a communication module; the ADC conversion module is used to perform analog-to-digital conversion for the collected electrical signals of the power-off monitoring circuit; the microprocessor is used to analyze and process various signals collected through the IO interface, including the traction wheel speed / acceleration / deceleration, the car speed / acceleration / deceleration, and the braking distance, braking time, the average braking deceleration of the car, the braking response time, and the wire rope slippage; the data storage unit is used to provide data storage function for the collected data and the analyzed and processed data; the power management module is used to provide power for the measuring host, each sensor module, and the communication module; the communication module is used to establish a communication connection with the operation terminal;

[0030] The operation terminal is installed with a corresponding application APP, the measurement host communicates with the operation terminal through wireless communication, and the operation terminal supports data input and data export functions, and can remotely update the terminal and has iterative capabilities.

[0031] Specifically, the braking response time of the brake is measured when the power supply or the stopping device is manually disconnected. By checking that the current signal at the braking circuit or the safety circuit suddenly changes to 0, this is the timing starting point t1 of the braking response time. After the power is cut off, the elevator brake slowly engages. During this process, the traction wheel speed slowly increases and then gradually decelerates to 0. The time when the traction wheel speed reaches its maximum value is t2. The time between t1 and t2 is the braking response time.

[0032] Specifically, the brake stopping time is from time t1 after the elevator brake is powered off to time t3 when the traction wheel stops running, and the time between t1 and t3 is the brake stopping time.

[0033] Specifically, the car braking time is the time from the moment t1 when the elevator brake is powered off to the moment t4 when the traction wire rope stops moving, which is the car stopping time.

[0034] Specifically, the wire rope slippage is the difference between the wire rope movement distance and the traction wheel movement distance when the wire rope continues to move or relatively moves after the elevator traction wheel stops until the wire rope stops.

[0035] Specifically, the average car braking deceleration is the second-order derivative of the car wire rope movement displacement with respect to the car braking time.

[0036] Furthermore, the operation terminal can be used to record and display the traction wheel speed / acceleration / deceleration, car speed / acceleration / deceleration, braking distance, braking time, average braking deceleration, braking response time, wire rope slip in real time, and can be used to display the braking response time and the results of comprehensive judgment of braking performance, and can be used to directly display test data and charts; the operation terminal can be used to generate test reports and support the function of exporting charts.

[0037] Compared with the prior art, the elevator brake dynamic parameter measuring instrument described in the utility model has the following advantages:

[0038] In the elevator brake dynamic parameter measuring instrument provided by the embodiment of the utility model, the current signal at the brake circuit or the safety circuit is checked. When the current signal suddenly changes to zero, this is the timing starting point of the brake response time. This measurement method does not need to change the original control circuit wiring of the elevator, which is safer and more efficient. In addition, it is more in line with the regulations on the brake response time, improves the measurement accuracy, can be used to measure the brake response time of the elevator brake in use, and can be used as a brake scrapping standard (brake response time measurement) to provide a measuring instrument, providing strong technical support for the decision-making deployment of promoting large-scale equipment renewal and replacement of old consumer goods with new ones; the speed measuring part of the elevator car motion parameter speed measuring wheel is the wire rope between the elevator traction wheel and the guide wheel, and the speed measuring wheel adopts a magnetic suction method, and because there is an anti-jump device between the traction wheel and the guide wheel, it can effectively avoid the lateral jumping of the traction wire rope after the elevator speed limiter-safety clamp is actuated, which causes the speed measuring wheel to be separated from the moving wire rope to distort the speed measurement, and it is more scientific and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of an elevator brake dynamic parameter measuring instrument provided by an embodiment of the utility model;

[0040] Figure 2 A schematic diagram of the framework structure of a measuring host in an elevator brake dynamic parameter measuring instrument provided in an embodiment of the utility model.

[0041] Reference numerals:

[0042] 1- measuring device; 11- rotary encoder speed measuring wheel; 12- bracket; 13- magnetic base;

[0043] 2-power failure monitoring device; 21-Hall sensor; 22-conditioning circuit;

[0044] 3- measuring host; 31- microprocessor; 32- data storage unit; 33- power management module; 34- ADC conversion module; 35- communication module;

[0045] 4- Operation terminal;

[0046] 51-traction wheel; 52-guide wheel; 53-wire rope;

[0047] 6-control cabinet; 61-brake circuit or safety circuit. DETAILED DESCRIPTION

[0048] For ease of understanding, the elevator brake dynamic parameter measuring instrument provided by the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings of the specification.

[0049] The utility model provides an elevator brake dynamic parameter measuring instrument, such as Figure 1 and Figure 2 As shown, it includes: a measuring device 1, a power failure monitoring device 2, a measuring host 3, and an operating terminal 4;

[0050] The measuring device 1 comprises: two sets of rotary encoder tachometer wheels 11 with dual code channels, a bracket 12 with a universal shaft, and a magnetic base 13; the rotary encoder tachometer wheel 11 is fixed to the magnetic base 13 through the bracket 12, and is in contact with the elevator traction wheel 51 and the steel wire rope 53 between the traction wheel 51 and the guide wheel 52, and the magnetic base 13 is installed at the metal structure between the internal pulleys of the elevator machine room, and is used to measure the motion parameters of the traction wheel 51 and the steel wire rope 53;

[0051] The power failure monitoring device 2 is composed of a Hall sensor 21 and a conditioning circuit 22. The Hall sensor 21 is used to collect the current signal in the brake circuit or the safety circuit 61 at the elevator control cabinet 6. During the braking test, when the Hall sensor 21 collects that the current signal in the brake circuit or the safety circuit 61 at the elevator control cabinet 6 suddenly changes to 0, this is the timing starting point of the braking test, and provides important time data for the subsequent data analysis and processing of the braking parameters.

[0052] The measuring host 3 includes: a microprocessor 31, a data storage unit 32, a power management module 33, an ADC conversion module 34, and a communication module 35; the ADC conversion module 34 is used to perform analog-to-digital conversion on the collected electrical signals of the power-off monitoring circuit; the microprocessor 31 is used to analyze and process various signals collected through the IO interface, including the traction wheel speed / acceleration / deceleration, the car speed / acceleration / deceleration, and the braking distance, braking time, the average braking deceleration of the car, the braking response time, and the wire rope slip; the data storage unit 32 is used to provide data storage function for the collected data and the analyzed and processed data; the power management module 34 is used to provide power for the measuring host 3, each sensor module, and the communication module 35; the communication module 35 is used to establish a communication connection with the operation terminal 4;

[0053] The operation terminal 4 is installed with the corresponding application APP. The measurement host 3 communicates with the operation terminal 4 through wireless communication. The operation terminal 4 supports data input (elevator equipment information input) and data export functions, and can remotely update the terminal, with iterative capabilities (providing remote update services for new requirements after standard updates (such as changes in values ​​after standard updates)).

[0054] Compared with the prior art, the elevator brake dynamic parameter measuring instrument described in the embodiment of the utility model has the following advantages:

[0055] In the elevator brake dynamic parameter measuring instrument provided by the embodiment of the utility model, the current signal at the brake circuit or the safety circuit is checked. When the current signal suddenly changes to zero, this is the timing starting point of the brake response time. This measurement method does not need to change the original control circuit wiring of the elevator, which is safer and more efficient. In addition, it is more in line with the regulations on the brake response time, improves the measurement accuracy, can be used to measure the brake response time of the elevator brake in use, and can be used as a brake scrapping standard (brake response time measurement) to provide a measuring instrument, providing strong technical support for the decision-making deployment of promoting large-scale equipment renewal and replacement of old consumer goods with new ones; the speed measuring part of the elevator car motion parameter speed measuring wheel is the wire rope between the elevator traction wheel and the guide wheel, and the speed measuring wheel adopts a magnetic suction method, and because there is an anti-jump device between the traction wheel and the guide wheel, it can effectively avoid the lateral jumping of the traction wire rope after the elevator speed limiter-safety clamp is actuated, which causes the speed measuring wheel to be separated from the moving wire rope to distort the speed measurement, and it is more scientific and efficient.

[0056] Specifically, the braking response time of the brake is measured when the power supply or the stopping device is manually disconnected. By checking that the current signal at the braking circuit or the safety circuit suddenly changes to 0, this is the timing starting point t1 of the braking response time. After the power is cut off, the elevator brake slowly engages. In this process, the traction wheel speed slowly increases and then gradually decelerates to 0. The time of the maximum value point of the traction wheel speed (the point where the slope of the speed and time function is zero) is t2. The time between t1 and t2 is the braking response time.

[0057] Specifically, the brake stopping time is from time t1 after the elevator brake is powered off to time t3 when the traction wheel stops running, and the time between t1 and t3 is the brake stopping time.

[0058] Specifically, the car braking time is the time from the moment t1 when the elevator brake is powered off to the moment t4 when the traction wire rope stops moving, which is the car stopping time.

[0059] Specifically, the wire rope slippage is the difference between the wire rope movement distance and the traction wheel movement distance when the wire rope continues to move or relatively moves after the elevator traction wheel stops until the wire rope stops.

[0060] Specifically, the average car braking deceleration is the second-order derivative of the car wire rope movement displacement with respect to the car braking time.

[0061] Furthermore, the above-mentioned operation terminal 4 can be used to record and display the traction wheel speed / acceleration / deceleration, car speed / acceleration / deceleration, braking distance, braking time, average braking deceleration, braking response time, wire rope slip in real time, and can be used to display the braking response time and the results of comprehensive judgment of braking performance, and can be used to directly display test data and charts; the operation terminal 4 can be used to generate test reports and support the function of exporting charts.

[0062] The measuring principle and measuring steps of the elevator brake dynamic parameter measuring instrument provided by the embodiment of the utility model are described in detail below:

[0063] Step S1, installing and debugging the measuring device, the power-off monitoring device, the measuring host and the operating terminal based on the Android platform as required, and inputting the parameters of the test elevator (such as equipment model, product number, brake model, brake manufacturing date, rated speed and other information) on the operating terminal. When installing and debugging the instrument, the elevator is powered off;

[0064] Step S2: After installation and debugging, the brake parameters of the elevator can be measured. During the brake test, after the power supply of the elevator running at normal speed is manually disconnected or the stop device is pressed, the power failure monitoring device collects the current signal at the brake circuit or the safety circuit, and detects that the current signal suddenly changes to zero. This is the starting point of the timing of the brake response time and the timing of the brake test;

[0065] Step S3, then the elevator brake starts to engage, the elevator traction wheel and traction wire rope start to accelerate first and then slowly decelerate, under normal circumstances, the traction wheel and traction wire rope finally stop under the action of the brake, during this dynamic change process, the measuring device collects the dynamic speed of the traction wheel and wire rope in real time;

[0066] Step S4: the measuring host analyzes and processes the collected data and displays the measured data in real time on the operating terminal;

[0067] Step S5: Export the test report after the test is completed.

[0068] In addition, the elevator brake dynamic parameter measuring instrument provided by the embodiment of the utility model can also provide data processing and analysis capabilities, making technical reserves for promoting intelligent elevator supervision; specifically, the measuring instrument can analyze and process the detection data of all previous brakes of a certain elevator, and can analyze the brake performance parameters of a single elevator throughout its life cycle; it can also classify and process the braking parameters of elevator brakes of the same model, especially comparative analysis of brake performance parameters of the same model brakes with different years of use, and give scientific and feasible brake performance judgments, providing strong data support for the scrapping of brake components, and providing strong technical support for intelligent elevator safety supervision.

[0069] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An elevator brake dynamic parameter measuring instrument, characterized in that: include: Measuring device, power failure monitoring device, measuring host, and operating terminal; The measuring device comprises: two sets of rotary encoder tachometer wheels with double code channels, a bracket with a universal shaft, and a magnetic base; the rotary encoder tachometer wheels are fixed to the magnetic base through the bracket, and are in contact with the elevator traction wheel and the steel wire rope between the traction wheel and the guide wheel, and the magnetic base is installed at the metal structure between the internal pulleys of the elevator machine room, and is used to measure the motion parameters of the traction wheel and the steel wire rope; The power failure monitoring device is composed of a Hall sensor and a conditioning circuit. The Hall sensor is used to collect current signals in the brake circuit or safety circuit of the elevator control cabinet. During the brake test, when the Hall sensor collects that the current signal in the brake circuit or safety circuit of the elevator control cabinet suddenly changes to 0, this is the timing starting point of the brake test, and provides important time data for subsequent data analysis and processing of brake parameters. The measuring host comprises: a microprocessor, a data storage unit, a power management module, an ADC conversion module, and a communication module; the ADC conversion module is used to perform analog-to-digital conversion for the collected electrical signals of the power-off monitoring circuit; the microprocessor is used to analyze and process various signals collected through the IO interface, including the traction wheel speed / acceleration / deceleration, the car speed / acceleration / deceleration, and the braking distance, braking time, the average braking deceleration of the car, the braking response time, and the wire rope slippage; the data storage unit is used to provide data storage function for the collected data and the analyzed and processed data; the power management module is used to provide power for the measuring host, each sensor module, and the communication module; the communication module is used to establish a communication connection with the operation terminal; The operation terminal is installed with a corresponding application APP, the measurement host communicates with the operation terminal through wireless communication, and the operation terminal supports data input and data export functions, and can remotely update the terminal and has iterative capabilities.

2. The elevator brake dynamic parameter measuring instrument according to claim 1, characterized in that: The braking response time of the brake is measured when the power supply or the stopping device is manually disconnected. When the current signal at the braking circuit or the safety circuit suddenly changes to 0, this is the timing starting point t1 of the braking response time. After the power is cut off, the elevator brake slowly engages. During this process, the traction wheel speed slowly increases and then gradually decelerates to 0. The time when the traction wheel speed reaches its maximum value is t2. The time between t1 and t2 is the braking response time.

3. The elevator brake dynamic parameter measuring instrument according to claim 1, characterized in that: The brake stopping time is from time t1 after the elevator brake is powered off to time t3 when the traction wheel stops running. The time between t1 and t3 is the brake stopping time.

4. The elevator brake dynamic parameter measuring instrument according to claim 1, characterized in that: The car braking time is the time from the moment t1 when the elevator brake is powered off to the moment t4 when the traction wire rope stops moving, which is the car stopping time.

5. The elevator brake dynamic parameter measuring instrument according to claim 1, characterized in that: The wire rope slippage is the difference between the wire rope movement distance and the traction wheel movement distance when the wire rope continues to move or moves relatively after the elevator traction wheel stops until the wire rope stops.

6. The elevator brake dynamic parameter measuring instrument according to claim 1, characterized in that: The average car braking deceleration is the second-order derivative of the car wire rope motion displacement with respect to the car braking time.

7. The elevator brake dynamic parameter measuring instrument according to any one of claims 1 to 6, characterized in that: The operation terminal can be used to record and display the traction wheel speed / acceleration / deceleration, car speed / acceleration / deceleration, braking distance, braking time, average braking deceleration, braking response time, wire rope slip in real time, and can be used to display the braking response time and the results of comprehensive judgment of braking performance, and can be used to directly display test data and charts; the operation terminal can be used to generate test reports and support the function of exporting charts.

Images