A method and system for detecting safety hazards of elevator brakes

Abstract

The present invention provides a method for detecting safety hazards of elevator brakes, which is applied to the technical field of elevator detection. Specifically, it includes the following steps: The main control device collects the vibration frequency curve of the brake in real time and compares it with the standard vibration curve to judge the current state of the brake; The main control device collects the acceleration curve of the car in real time and compares it with the standard acceleration curve to judge the current running state of the car; The main control device judges whether there are safety problems with the brake according to the parameter model; The main control device records the similarity value M between the vibration frequency curve and the standard vibration curve, and predicts whether there are safety hazards with the brake. A system for detecting safety hazards of elevator brakes includes a vibration sensor, an acceleration sensor, a main control device and a human-computer interaction module. By comparing the collected vibration frequency curve and acceleration curve with the standard vibration curve and standard acceleration curve through the parameter model, it judges the current running states of the brake and the car and pre-judges whether there are safety hazards with the brake.

Description

Technical Field

[0001] The present invention belongs to the technical field of elevator detection, and particularly relates to a method and system for detecting safety hazards of elevator brakes. Background Art

[0002] An elevator is a transportation device for vertically transporting pedestrians or goods. An elevator serves a building with specified floors. A vertical elevator has a car that runs between at least two columns of vertical or inclined rigid guide rails with an inclination angle less than 15°, facilitating the entry and exit of passengers or the loading and unloading of goods. It can be divided into low-speed elevators, fast elevators, and high-speed elevators according to speed.

[0003] With the continuous increase in the number of elevators and the continuous improvement in their usage frequency, the safety of elevators has become increasingly important. However, the number of practitioners in the elevator after-sales maintenance industry does not match the current large number of elevator holdings. The traditional regular inspection method cannot detect elevator anomalies in a timely manner, and major safety accidents are likely to occur.

[0004] The elevator brake is an important part of an elevator. Whether the opening or closing process of the elevator brake meets the standard requirements, whether the brake is fully opened, whether the gap is too large, whether the braking force is insufficient, etc. pose great safety hazards. Once the above problems occur, it will lead to safety accidents during the operation of the elevator. Summary of the Invention

[0005] In view of the above problems in the prior art, the purpose of the present invention is to provide a method for detecting safety hazards of elevator brakes. By comparing the vibration frequency curve and car acceleration curve collected by a parameter model with the corresponding standard vibration curve and standard acceleration curve, the current operating states of the brake and the car are judged, and whether there are safety hazards in the brake is predicted.

[0006] A method for detecting safety hazards of elevator brakes specifically includes the following steps:

[0007] S1. The main control device collects the vibration frequency curve of the brake in real time and compares the vibration frequency curve with the standard vibration curve to judge the current state of the brake;

[0008] S2. The main control device collects the acceleration curve of the car in real time and compares the acceleration curve with the standard acceleration curve to judge the current operating state of the car;

[0009] S3. The main control device judges whether there are safety problems with the brake according to the parameter model based on the current state of the brake and the current operating state of the car;

[0010] S4. The main control device records the similarity value M between the vibration frequency curve and the standard vibration curve and predicts whether there are safety hazards in the brake.

[0011] Preferably, the states of the brake include an open state and a closed state.

[0012] Preferably, in S3, the main control device determines whether there is a safety problem with the brake according to the parameter model, based on the current state of the brake and the current operating state of the car. The specific judgment process includes:

[0013] If the brake is in the closed state, the car is running, and the running speed of the car is greater than the set first threshold, then there is a fault with the brake;

[0014] If the brake is in the closed state, the car is running, and the running speed of the car is less than the set second threshold, then there is a fault with the brake;

[0015] If the brake is in the open state and the car stops running, then there is a fault with the brake.

[0016] Preferably, the vibration frequency curve is collected by installing vibration sensors on the brake.

[0017] Preferably, the acceleration curve is collected by installing acceleration sensors on the car.

[0018] The second object of the present invention is to propose a system for detecting safety hazards of elevator brakes, which is used to implement the method for detecting safety hazards of elevator brakes as described above, including:

[0019] Vibration sensors, installed on both sides of the brake, for collecting the vibration frequency curve of the brake and transmitting it to the main control device;

[0020] Acceleration sensors, installed on the car, for collecting the acceleration curve of the car and transmitting it to the main control device;

[0021] The main control device, with a parameter model built-in, for comparing the vibration frequency curve and the acceleration curve with the standard vibration curve and the standard acceleration curve respectively, judging the current operating states of the brake and the car, and predicting whether there are safety hazards with the brake;

[0022] The human-machine interaction module, for receiving the signals transmitted by the main control device and displaying them. The human-machine interaction module includes:

[0023] A storage unit, for storing data information;

[0024] A display unit, for displaying data information and curve graphs;

[0025] An alarm unit, for timely reminding the staff to perform maintenance according to the judgment and prediction results of the main control device.

[0026] The beneficial effects of the present invention are as follows: The method and system for detecting safety hazards of elevator brakes compare the vibration frequency curve of the brake and the acceleration curve of the car collected through a parameter model with the corresponding standard vibration curve and standard acceleration curve, and judge the current operating states of the brake and the car. According to the operating state of the car under different brake states, it is judged whether there are faults in the brake, and whether there are safety hazards in the brake is judged through the similarity value M between the vibration frequency curve and the standard vibration curve, which can detect the elevator state in real time and discover safety hazards in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0028] Figure 1 is a flowchart of the detection method of the present invention;

[0029] Figure 2 is a schematic block diagram of the detection system of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Embodiment 1

[0031] As Figure 1 shown, a method for detecting safety hazards of elevator brakes specifically includes the following steps:

[0032] S1. The main control device collects the vibration frequency curve of the brake in real time through a vibration sensor installed on the brake, and compares the vibration frequency curve with the standard vibration curve to judge the current state of the brake. Among them, the states of the brake include the open state and the closed state.

[0033] S2. The main control device collects the acceleration curve of the car in real time through an acceleration sensor installed on the car, and compares the acceleration curve with the standard acceleration curve to judge the current operating state of the car. The operating states of the car include: whether the car is stopped or running. If it is stopped, at which floor it is parked; if it is running, whether it is going up or down, and what is the running speed, etc.

[0034] S3. The main control device judges whether there are safety problems with the brake according to the parameter model based on the current state of the brake and the current operating state of the car. The parameter model is set with a first threshold and a second threshold. The specific judgment process includes:

[0035] If the brake is in the closed state, the car is running, and the running speed of the car is greater than the set first threshold, then there is a fault situation with the brake. That is, it is judged that the brake is in the closed state by the collected vibration frequency curve, and it is judged that the car is running by the collected acceleration curve, and the running speed is greater than the set first threshold. Then there is a safety hazard of the elevator running into the top or bottoming out, indicating that there is a fault with the brake.

[0036] If the brake is in the closed state, the car is running, and the running speed of the car is less than the set second threshold, then there is a fault situation with the brake. That is, it is judged that the brake is in the closed state by the collected vibration frequency curve, and it is judged that the car is running by the collected acceleration curve, and the running speed is less than the set second threshold. Then there is a safety hazard of the elevator running away or running backward, indicating that there is a fault with the brake. The possible reasons for the fault are: insufficient braking force or too large clearance of the brake.

[0037] If the brake is in the open state and the car stops running, then there is a fault situation with the brake.

[0038] S4. The main control device records the similarity value M between the vibration frequency curve and the standard vibration curve. When the number of times that the similarity value M is greater than the set threshold T reaches N, it is predicted that there is a safety hazard with the brake, and the staff is reminded to repair the brake. When there is no fault problem with the current brake, the similarity value M can be used to predict whether there is a safety hazard with the brake, which is beneficial to timely maintain and repair the brake.

[0039] Embodiment 2

[0040] As Figure 2 shown, the second aspect of the present invention is to propose a system for detecting the safety hazard of an elevator brake, which is used to implement the method for detecting the safety hazard of an elevator brake described above, and includes a vibration sensor, an acceleration sensor, a main control device, and a human-machine interaction module.

[0041] Among them, vibration sensors are installed on both sides of the brake, and are used to collect the vibration frequency curve of the brake and transmit it to the main control device; acceleration sensors are installed on the car, and are used to collect the acceleration curve of the car and transmit it to the main control device.

[0042] The main control device is built-in with a parameter model, which is used to compare the vibration frequency curve and the acceleration curve with the standard vibration curve and the standard acceleration curve respectively, judge the current running state of the brake and the car, and predict whether there is a safety hazard with the brake.

[0043] The human-machine interaction module is used to receive and display the signals transmitted by the main control device. The human-machine interaction module includes a storage unit for storing data information, a display unit for displaying data information and curve graphs, and an alarm unit for timely reminding the staff to perform maintenance according to the judgment and prediction results of the main control device. Remote monitoring can be realized through the human-machine interaction module, which is convenient for the staff to view the monitored elevator conditions in a timely manner.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for detecting safety hazards of elevator brakes, characterized in that, it specifically includes the following steps: S1. The main control device collects the vibration frequency curve of the brake in real time, and compares the vibration frequency curve with the standard vibration curve to judge the current state of the brake. The states of the brake include the open state and the closed state; S2. The main control device collects the acceleration curve of the car in real time, and compares the acceleration curve with the standard acceleration curve to judge the current operating state of the car; S3. The main control device judges whether there are safety problems with the brake according to the parameter model based on the current state of the brake and the current operating state of the car; The specific judgment process includes: If the brake is in the closed state, the car is running, and the running speed of the car is greater than the set first threshold, then there is a fault with the brake; If the brake is in the closed state, the car is running, and the running speed of the car is less than the set second threshold, then there is a fault with the brake; If the brake is in the open state and the car stops running, then there is a fault with the brake; S4. The main control device records the similarity value M between the vibration frequency curve and the standard vibration curve, and predicts whether there are safety hazards with the brake.

2. The method for detecting safety hazards of elevator brakes according to claim 1, characterized in that, the vibration frequency curve is collected by installing a vibration sensor on the brake.

3. The method for detecting safety hazards of elevator brakes according to claim 1, characterized in that, the acceleration curve is collected by installing an acceleration sensor on the car.

4. A system for detecting safety hazards of elevator brakes, which is used to implement the method for detecting safety hazards of elevator brakes according to any one of claims 1-3, characterized in that, it includes: Vibration sensors, installed on both sides of the brake, for collecting the vibration frequency curve of the brake and transmitting it to the main control device; Acceleration sensors, installed on the car, for collecting the acceleration curve of the car and transmitting it to the main control device; The main control device, with a parameter model built in, is used to compare the vibration frequency curve and the acceleration curve with the standard vibration curve and the standard acceleration curve respectively, judge the current operating states of the brake and the car, and predict whether there are safety hazards with the brake; The human-machine interaction module is used to receive and display the signals transmitted by the main control device. The human-machine interaction module includes: A storage unit for storing data information; A display unit for displaying data information and curve graphs; An alarm unit for timely reminding the staff to carry out maintenance according to the judgment and prediction results of the main control device.

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