CN117326435B - An escalator fault diagnosis method and diagnosis system - Google Patents

Abstract

The invention relates to an escalator fault diagnosis method and a diagnosis system, and relates to the technical field of escalators. The escalator fault diagnosis method includes no-load detection, confidence analysis of bearing vibration amplitude when no-load, analysis of corresponding shaft torque of the bearing when no-load, Determine the relationship coefficient, determine the relationship curve, alarm judgment, alarm and other steps; the escalator fault diagnosis system includes detection module, processing module, storage module, alarm module and other modules. The invention can perform automatic fault monitoring on old escalators and improve the accuracy of monitoring.

Description

An escalator fault diagnosis method and diagnosis system

Technical field

The present invention relates to the technical field of escalators, and in particular, to an escalator fault diagnosis method and diagnosis system.

Background technique

The escalator is composed of a chain conveyor with a special structure and two belt conveyors with a special structure. It is a fixed electric drive device used to transport passengers upward or downward between different floors of the building. . Because escalators have the advantages of continuous and efficient transportation, escalators are often used in stations and shopping malls with large flow of people. Since escalators will be in heavy-load operation for a long time, if the escalator supervision cannot feedback fault information in time, it will easily lead to escalator accidents, resulting in significant losses of life and property.

At present, some escalators have been integrated into the escalator monitoring system. The escalator monitoring system can monitor the escalator. The monitoring steps are roughly as follows:

S1 test: Test the escalator when the escalator is installed to obtain the load value of the escalator and the vibration amplitude of each bearing;

S2 calculates the fitting curve: uses the load value and the vibration amplitude of each bearing to make a fitting curve corresponding to the bearing;

S3 sets the alarm curve: sets the alarm curve corresponding to the bearing vibration amplitude according to each fitting curve;

S4 monitoring: Monitors the running escalator. If the vibration amplitude of a certain bearing exceeds the corresponding alarm curve, it proves that the bearing is faulty and the escalator should be deactivated and maintained in time.

This part of the escalator may be called an escalator. This monitoring method requires the newly installed escalator to be tested first to ensure that the escalator is in a fault-free state during the test, thereby making the set alarm curve more accurate.

However, old-fashioned escalators currently cannot be directly integrated into the escalator monitoring system. Since old-fashioned escalators do not have the ability to automatically monitor, escalator monitoring relies on manual inspections for regular inspections, and checking whether the escalator is faulty is based on the experience of the inspector. Therefore, it is unknown whether there are hidden faults in old escalators.

If the escalator monitoring system is directly applied to old escalators, if the bearings of the old escalators themselves are faulty, the vibration amplitude of each bearing measured in the S1 detection step will be high; then in the S3 alarm curve setting step , the set alarm curve will be higher than the actual alarm curve; in this way, in the S4 monitoring step, the alarm will be issued later than the escalator failure time, thus burying risks for the operation of the escalator.

Contents of the invention

In order to intelligently monitor old-fashioned escalators and improve the accuracy of monitoring, the present invention provides an escalator fault diagnosis method and diagnosis system.

In the first aspect, the present invention provides an escalator fault diagnosis method that adopts the following technical solution:

An escalator fault diagnosis method includes the following steps:

No-load detection: Detect the drive motor and each bearing of the unloaded escalator, and then obtain the output torque M _M of the drive motor, the output speed n _M of the drive motor, the vibration amplitude a _i ^t of the bearing and the bearing when the escalator is no-load. The rotation speed n _i , i is the bearing serial number, t is the detection time;

Confidence analysis of bearing vibration amplitude when no-load: Calculate the credible value A ^iZ of the bearing vibration amplitude when the escalator is no-load based on the rotation speed n _i and vibration amplitude a _i ^t of the bearing when the escalator is no-load. The bearing vibration amplitude when no-load The calculation model of the trusted value A ^iZ of the value is as follows:

;

In the formula, A _i ^Tj is the vibration amplitude range within the jth rotation period of the i-th bearing, k _i is the number of turns of the i-th bearing during the detection process; the calculation model of A _i ^Tj is as follows:

;

Analysis of the shaft torque corresponding to the bearing when no-load: Calculate the torque corresponding to the i-th bearing when the escalator is no-load based on the output torque M _M of the drive motor when the escalator is no-load, the output speed n _M of the drive motor, and the speed _n of the i-th bearing The calculation model of shaft torque _Mi , _Mi is as follows:

;

Determine the relationship coefficient: Determine the relationship coefficient λ i between the credible value A ^iZ of the vibration amplitude under no load and the shaft torque M _i . The calculation model of the relationship coefficient _{λ i is} as follows:

;

Determine the relationship curve: Set the alarm relationship coefficient C, which is greater than 1, and determine the alarm relationship curve f(a) based on the alarm relationship coefficient C. The alarm relationship curve f(a) is as follows:

;

In the formula, _Mi ^S is the real-time torque of the shaft corresponding to the i-th bearing,

The calculation model of M _i ^S is as follows:

;

In the formula: M _M ^S is the real-time torque of the drive motor, n _M ^S is the real-time speed of the drive motor, n _i ^S is the real-time speed of the i-th bearing;

Alarm judgment: If under a certain load, the vibration amplitude a _i ^S of the bearing is greater than the alarm relationship curve f (a), the alarm step will be executed;

Alarm: Send an alarm and stop the escalator.

Since it may not be possible to obtain various parameters of the old escalator when retrofitting the old escalator, by adopting the above technical solution, when the old escalator is retrofitted, the old escalator is first tested to obtain the vibration of the bearing when the escalator is unloaded. Amplitude a _i ^t , because there may be hidden faults in the bearing, the vibration amplitude of the bearing is bound to be larger than that of a brand-new bearing; because when there is a fault in the bearing, the vibration amplitude of the bearing will be periodic, so The minimum value of the vibration amplitude in each rotation cycle of the bearing is taken as a reference basis, and then the credible value A ^iZ of the bearing vibration amplitude when no load is calculated, and then the credible value A iZ of the bearing vibration amplitude when no load is calculated. The value A ^iZ determines the relationship between the vibration amplitude and the load. The total load of the escalator will be reflected in the output torque of the drive motor and the output speed of the drive motor. The escalator moves at a constant speed, so the vibration amplitude and the axis of the escalator can be determined. The relationship coefficient λ _i of the torque M _i is determined, and the alarm relationship curve f(a) is determined based on the relationship coefficient λ _i and the set alarm relationship coefficient C. Then, the bearing is determined based on the real-time torque of the shaft where the bearing is located and the real-time vibration amplitude of the bearing. If a fault occurs, automatic fault monitoring of the old escalator can be carried out, and the accuracy of monitoring can be improved.

Optionally, a step of obtaining the transmission efficiency is further provided between the confidence analysis step of the bearing vibration amplitude when no load and the corresponding shaft torque analysis step of the bearing when no load:

Obtain the transmission efficiency: According to the transmission mode of the escalator itself, obtain the transmission efficiency η between each transmission shaft in the escalator;

In the step of analyzing the shaft torque corresponding to the bearing when no-load, the torque M _i of the shaft corresponding to the i-th bearing when the escalator is no-load is also calculated based on the transmission efficiency eta;

The calculation model of _Mi is modified as follows:

;

In the formula, η _i ^M is the total transmission efficiency between the shaft corresponding to the i-th bearing and the output shaft of the drive motor; the calculation model of η _i ^M is as follows:

;

In the step of determining the alarm relationship curve, the calculation model of M _i ^S is modified as follows:

.

Through the above technical solution, when analyzing the torque of the shaft corresponding to the bearing, the analysis is combined with the transmission efficiency, so that the torque of the shaft obtained is more accurate; since the vibration amplitude of the bearing is related to the torque of the shaft, therefore, when calculating the relationship coefficient λ _i The time is more accurate, and the set relationship curve f(a) is also more accurate, thereby reducing the probability of bearing failure but being unable to issue an alarm.

Optionally, in the alarm relationship curve step, the alert relationship coefficient C ^' is also set, the alert relationship coefficient C ^' is ^{greater than 1 and less than the alarm relationship coefficient C, and the alert relationship curve f' (} a ), the alert relationship curve f ^' (a) is as follows:

;

In the alarm judgment step, if under a certain load, the vibration amplitude a _i ^S of the bearing is greater than the warning relationship curve f ^' (a) and less than or equal to the alarm relationship curve f (a), the vibration amplitude of the bearing is also Judgment is made when a _i ^S is greater than the frequency of the warning relationship curve f ^' (a) and less than or equal to the alarm relationship curve f (a); if within unit time, the vibration amplitude of the bearing a _i ^S is greater than the warning relationship curve f ^' (a) And if the number of times less than or equal to the alarm relationship curve f(a) is greater than or equal to the first threshold, then the alarm step is executed.

During the operation of the escalator, the vibration amplitude of the bearing usually does not rise instantaneously. When the vibration amplitude of the bearing rises to a certain level and occurs continuously, it proves that the bearing is close to failure. By adopting the above technical solution, when the vibration amplitude of the bearing When the amplitude a _i ^S is frequently greater than the warning relationship curve f ^' (a) and less than or equal to the alarm relationship curve f (a), it is determined that the bearing will fail, thereby reducing the probability of passengers being injured due to bearing failure.

Optionally, in the alarm step, the serial number of the faulty bearing is also reported.

By adopting the above technical solution, maintenance personnel can quickly find the faulty bearing based on the faulty bearing serial number reported in the alarm step, thereby shortening the time spent by maintenance personnel maintaining the escalator and improving maintenance efficiency.

In the second aspect, the present invention provides an escalator fault diagnosis system that adopts the following technical solution:

An escalator fault diagnosis system, including

Detection module: includes a torque sensor, multiple speed sensors, and acceleration sensors with the same number as the bearings; the torque sensor is set on the output shaft of the drive motor, one of the speed sensors is set on the output shaft of the drive motor, and the remaining rotation speed sensors are One-to-one correspondence is provided on the transmission shaft of the escalator system, and one-to-one acceleration sensors are provided on the bearings;

Processing module: The input end is electrically connected to the output end of the detection module, and is used to calculate the credible value A ^iZ and the relationship coefficient λ _i of the bearing vibration amplitude at no-load through the detection results measured by the detection module, and then calculate the alarm relationship curve f (a) and the warning relationship curve f ^' (a); and determine whether the escalator is faulty based on the alarm relationship curve f (a) and the warning relationship curve f ^' (a);

Storage module: both the input end and the output end are electrically connected to the processing module for storing information;

Alarm module: The input end is electrically connected to the output end of the processing module for issuing an alarm.

By adopting the above technical solution, in the initial stage, the escalator is first tested for no-load, and then the torque of the drive motor is obtained through the torque sensor, the rotation speed of each transmission shaft is obtained through the speed sensor, the acceleration of each bearing is obtained through the acceleration sensor, and then the The processing module calculates the credible value A ^iZ of the bearing vibration amplitude at no load, the relationship coefficient λ _i , the alarm relationship curve f (a) and the warning relationship curve f ^' (a). After that, the escalator starts running, and the detection module monitors the escalator in real time. The processing module can determine whether the vibration amplitude of the bearing exceeds the alarm relationship curve f (a) and the warning relationship curve f ^' (a), and determines whether an alarm needs to be issued. If When an alarm needs to be issued, the alarm module issues an alarm to remind maintenance personnel that the escalator is faulty and requires timely maintenance.

Optionally, a selection module is also included,

The storage module is also provided with a database, which records transmission mode information and transmission efficiency information corresponding to the transmission mode;

Selection module: The input end is connected to the output end of the storage module, and the output end is electrically connected to the input end of the processing module to select the transmission mode recorded in the storage module and output the transmission efficiency corresponding to the transmission mode to the processing module.

By adopting the above technical solution, before performing no-load detection on the escalator, the transmission efficiency is first called in the database according to the transmission mode between each transmission shaft, and the corresponding transmission efficiency is input into the processing module. In this way, the relationship coefficient λ is calculated _i , the alarm relationship curve f (a) and the warning relationship curve f ^' (a) are more accurate, thus improving the accuracy of monitoring.

Optionally, a display module is also included,

Display module: The connection between the input terminal and the output of the processing module is used to display alarm information.

By adopting the above technical solution, when the escalator issues an alarm, the processing module can transmit the fault information of the escalator to the display module for display, thereby facilitating maintenance personnel to quickly find the faulty bearing, thus shortening the time spent by maintenance personnel maintaining the escalator and improving Improve maintenance efficiency.

Optionally, a control module is also included,

Control module: The input end is connected with the electrical signal of the output end of the processing module, and the output end is connected with the electrical signal of the drive motor of the escalator.

By adopting the above technical solution, when the escalator issues an alarm, the control module can control the escalator's drive motor to stop running, thereby reducing the probability of the escalator operating in a fault state and improving safety.

To sum up, the present invention includes at least one of the following beneficial technical effects:

1. Through the confidence analysis of the bearing vibration amplitude when no load, the analysis of the corresponding shaft torque of the bearing when no load, the determination of the relationship coefficient and the setting of the steps to determine the alarm relationship curve, the escalator fault diagnosis method can be applied to old escalators, and then the escalator fault diagnosis method can be applied to old escalators. Old-fashioned escalators carry out automatic fault monitoring and improve the accuracy of monitoring.

2. By obtaining the setting of the transmission efficiency step, the calculation of the relationship coefficient λ _i and the alarm relationship coefficient C is more accurate, thereby further improving the accuracy of monitoring and reducing the probability of bearing failure without an alarm.

3. By setting the warning relationship coefficient C ^' and the alarm judgment steps, an alarm will be issued in time when the bearing is about to fail, thus reducing the probability of passengers being injured due to bearing failure.

4. Through the settings of the detection module and alarm module, the old escalator can be detected and analyzed, and the old escalator can also be monitored and diagnosed to determine whether there is a fault in the escalator, thereby reducing the probability of the escalator operating under a fault and improving safety.

Description of drawings

Figure 1 is a flow chart of Embodiment 1 of the present application;

Figure 2 is a system diagram of Embodiment 2 of the present application.

Detailed ways

The present invention will be described in further detail below with reference to FIGS. 1 to 2 .

Embodiment 1: This embodiment discloses an escalator fault diagnosis method. Referring to Figure 1, the escalator fault diagnosis method includes the following steps:

S1: Monitoring preparation stage: Modify the old escalator so that it has monitoring capabilities, and analyze the old escalator to formulate alarm logic.

S2: Monitoring and diagnosis stage: monitor the old escalator to determine whether the escalator is faulty.

The step S1 of the monitoring preparation phase includes the no-load detection step S1-1, the confidence analysis step S1-2 of the bearing vibration amplitude when no load, the step S1-3 of obtaining the transmission efficiency, the step S1-4 of the bearing corresponding shaft torque analysis step S1-4, Determine the relationship coefficient step S1-5 and determine the alarm relationship curve step S1-6.

S1-1: No-load detection: Detect the drive motor and each bearing of the unloaded escalator, and then obtain the output torque M _M of the drive motor, the output speed n _M of the drive motor, and the vibration amplitude a of the bearing when the escalator is no-load. _i ^t and the rotation speed n _i of the bearing. Among them, i is the bearing serial number, and t is the detection time. The rotation speed n _i of the bearing can be directly detected by the sensor. In order to save costs, it can also be calculated based on the transmission ratio between the output speed of the drive motor and the transmission shaft. The torque of each transmission shaft can also be directly detected by the sensor. If in order to Cost savings can also be derived based on the transmission ratio between the output torque of the drive motor and the transmission shaft, as well as the transmission efficiency.

S1-2: Confidence analysis of bearing vibration amplitude when no-load: Calculate the credible value A ^iZ of the bearing vibration amplitude when the escalator is no-load based on the rotation speed n _i and vibration amplitude a _i ^t of the bearing when the escalator is no-load, no-load The calculation model of the credible value A ^iZ of the bearing vibration amplitude is as follows:

;

In the formula, A _i ^Tj is the vibration amplitude range within the jth rotation period of the i-th bearing, k _i is the number of turns of the i-th bearing during the detection process; the calculation model of A _i ^Tj is as follows:

;

The calculation model of k _i is as follows: k _i =n _i *t; and k _i is rounded down.

S1-3: Obtain transmission efficiency: According to the transmission mode of the escalator itself, obtain the transmission efficiency η between each transmission shaft in the escalator;

S1-4: Analysis of the corresponding shaft torque of the bearing when no-load: According to the output torque M _M of the drive motor when the escalator is no-load, the output speed n _M of the drive motor, the speed _n of the i-th bearing and the transmission between each drive shaft The efficiency η calculates the torque _Mi of the shaft corresponding to the i-th bearing when the escalator is unloaded. The calculation model of _Mi is as follows:

;

In the formula, η _i ^M is the total transmission efficiency between the shaft corresponding to the i-th bearing and the output shaft of the drive motor; the calculation model of η _i ^M is as follows:

.

S1-5: Determine the relationship coefficient: Determine the relationship coefficient λ i between the credible value A ^iZ of the vibration amplitude under no load and the shaft torque M _i . The calculation model of the relationship coefficient _{λ i is} as follows:

.

The vibration amplitude a of the bearing can be understood as the acceleration of the shaft, and the acceleration is positively related to the radial force F ^' on the shaft; the radial force F ^' on the shaft is the component of the torsion F on the shaft, that is, the shaft The radial force F ^' experienced is positively related to the torque F experienced by the shaft; the torque F experienced by the shaft is positively related to the torque M of the shaft. Therefore, the above correlation coefficients can be integrated into the relationship coefficient λ _i .

S1-6: Determine the relationship curve: including the step of setting the alarm relationship curve S1-6-1 and the step of setting the warning relationship curve S1-6-2.

S1-6-1: Set the alarm relationship curve: set the alarm relationship coefficient C, the alarm relationship coefficient C is greater than 1, and determine the alarm relationship curve f (a) according to the alarm relationship coefficient C and the relationship coefficient λi, the alarm relationship curve f ( a) The following formula:

;

In the formula, _Mi ^S is the real-time torque of the shaft corresponding to the i-th bearing,

The calculation model of M _i ^S is as follows:

;

In the formula: M _M ^S is the real-time torque of the drive motor, n _M ^S is the real-time speed of the drive motor, and n _i ^S is the real-time speed of the i-th bearing.

S1-6-2: Set the warning relationship curve: set the warning relationship coefficient C ^' , which is greater than 1 and less than the alarm relationship coefficient ^C , and determine the warning relationship curve based on the warning relationship coefficient C ^' and the relationship coefficient λ _i f ^' (a), the warning relationship curve f ^' (a) is as follows:

.

The monitoring and diagnosis phase step S2 includes an alarm judgment step S2-1 and an alarm step S2-2.

S2-1: Alarm judgment: including direct alarm judgment step S2-1-1 and observation alarm judgment step S2-1-2.

S2-1-1: Direct alarm judgment: If under a certain load, the vibration amplitude a _i ^S of the bearing is greater than the alarm relationship curve f(a), then the alarm step S2-2 is executed.

S2-1-2: Observe and alarm judgment: If under a certain load, the vibration amplitude a _i ^S of the bearing is greater than the warning relationship curve f ^' (a) and less than or equal to the alarm relationship curve f (a), the bearing's vibration amplitude a i S is also The vibration amplitude a _i ^S is greater than the frequency of the warning relationship curve f ^' (a) and less than or equal to the alarm relationship curve f (a); if within unit time, the vibration amplitude a _i ^S of the bearing is greater than the warning relationship curve f ^' (a) and the number of times less than or equal to the alarm relationship curve f(a) is greater than or equal to the first threshold, then the alarm step is executed.

S2-2: Alarm: Sound an alarm, report the serial number of the faulty bearing, and stop the escalator.

The implementation principle of the escalator fault diagnosis method in this embodiment is as follows:

First, the old escalator is modified and tested; during the test, the reliability of the vibration amplitude of the bearing when no-load is first made to ensure that the vibration amplitude of the bearing used is not the vibration amplitude of the bearing failure, thereby ensuring that the vibration amplitude of the no-load The accuracy of the relationship coefficient λ _{i between} the credible value A ^iZ of the vibration amplitude and the shaft torque _{Mi i} is more accurate, and finally the alarm relationship curve f (a) and the warning relationship curve f ^' (a) are determined based on the relationship coefficient λ _i , the alarm relationship coefficient C and the warning relationship coefficient C ^' .

Then monitor and diagnose the old escalator; during monitoring, if under a certain load, the vibration amplitude a _i ^S of the bearing is greater than the alarm relationship curve f(a), an alarm will be issued directly, thereby reminding maintenance personnel that the escalator is faulty; If under a certain load, the vibration amplitude a _i ^S of the bearing is greater than the warning relationship curve f ^' (a) and less than or equal to the alarm relationship curve f (a), the vibration amplitude a _i ^S of the bearing is greater than the warning relationship curve f ^' (a) and less than or equal to the frequency of the alarm relationship curve f (a); if within unit time, the vibration amplitude a _i ^S of the bearing is greater than the warning relationship curve f ^' (a) and less than or equal to the alarm relationship curve f If the number of (a) is greater than or equal to the first threshold, an alarm will be issued to remind maintenance personnel that the escalator is about to malfunction.

Embodiment 2: This embodiment discloses an escalator fault diagnosis system. Referring to Figure 2, the escalator fault diagnosis system includes:

Detection module: includes a torque sensor, multiple speed sensors, and acceleration sensors with the same number as the bearings; the torque sensor is set on the output shaft of the drive motor and is used to detect the real-time torque M _M ^S of the drive motor. One of the speed sensors is set on the drive motor. The output shaft of the motor is used to detect the real-time rotation speed n _M ^S of the drive motor. The remaining rotation speed sensors are arranged on the transmission shaft of the escalator system in one-to-one correspondence and are used to detect the rotation speed of each transmission shaft, and then obtain the relative speed of the transmission shaft. Corresponding to the real-time rotation speed n _i ^S of the bearing, the acceleration sensor is arranged on the bearing one by one to detect the real-time vibration amplitude a _i ^S of each bearing; the acceleration of the bearing is the vibration amplitude of the bearing. The output terminals of the torque sensor, rotation speed sensor and acceleration sensor are electrically connected to the input terminal of the processing module.

Storage module: a database is provided, which is used to store the transmission efficiency eta, the alarm relationship coefficient C, the warning relationship coefficient C ^' and the first threshold corresponding to the transmission mode. The output end of the storage module is electrically connected to the input end of the processing module, so that the processing module can directly call the alarm relationship coefficient C, the warning relationship coefficient C ^' and the first threshold in the storage module; the input end of the storage module and the output of the processing module The terminal electrical signal connection allows the data processed by the processing module to be stored in the storage module.

Processing module: In the monitoring preparation stage, it is used to calculate the credible value A ^iZ and the relationship coefficient λ _i of the bearing vibration amplitude at no-load through the detection results measured by the detection module, and then calculate the alarm relationship curve f (a) and the warning relationship. Curve f ^' (a);

In the monitoring and diagnosis stage, it is used to calculate the real-time torque of each drive shaft, and compare the real-time vibration amplitude a _i ^S of the bearing with the alarm relationship curve f (a) and the warning relationship curve f ^' (a), and then determine whether the escalator Fault.

Selection module: The input end is connected to the output end of the storage module, and the output end is electrically connected to the input end of the processing module. Select the storage module according to the transmission form of the escalator system, and output the transmission efficiency corresponding to the transmission mode to the processing module. module.

Alarm module: The input end is electrically connected to the output end of the processing module for issuing an alarm.

Display module: The connection between the input terminal and the output of the processing module is used to display alarm information.

Control module: The input terminal is connected with the electrical signal of the output terminal of the processing module, and the output terminal is connected with the electrical signal of the drive motor of the escalator, which is used to control the drive motor to stop running.

The implementation principle of the escalator fault diagnosis system in this embodiment is:

In the monitoring preparation stage, the escalator is in an unloaded state. At this time, the real-time torque M _M ^S of the drive motor detected by the torque sensor is the output torque M _M of the drive motor when the escalator is unloaded. The drive speed sensor detected by the speed sensor on the output shaft of the drive motor The real-time speed n _M ^S of the motor is the output speed n _M of the drive motor when the escalator is unloaded. The real-time speed n _i ^S of each bearing detected by the other rotation speed sensors is the speed n _i of the bearing when the escalator is unloaded. The acceleration sensor detects each The real-time vibration amplitude a _i ^S of the bearing is the vibration amplitude a _i ^t of the bearing when the escalator is unloaded. Since when the escalator is unloaded, the output torque M _M of the drive motor, the real-time speed n _M ^S of the drive motor, and the real-time speed n _i ^S of each bearing remain almost unchanged, they can be regarded as fixed values.

The processing module then calculates the credible value A ^iZ of the bearing vibration amplitude when the escalator is unloaded based on the rotation speed n _i and vibration amplitude a _i ^t of the bearing when the escalator is unloaded. According to the output torque M _M and the drive motor of the drive motor when the escalator is unloaded, The output speed n _M of the motor, the speed n _i of the i-th bearing and the transmission efficiency eta between each drive shaft are used to calculate the torque M _i of the shaft corresponding to the i-th bearing when the escalator is unloaded. According to the vibration amplitude when no load Calculate the relationship coefficient λ _i between the trusted value A ^iZ of the value and the torque M _i of the shaft; then determine the alarm relationship curve f (a) and the warning relationship curve f ^' based on the relationship coefficient λ _i , the alarm relationship coefficient C and the warning relationship coefficient C ^' (a).

In the monitoring and diagnosis stage, the torque sensor is used to detect the real-time torque M _M ^S of the drive motor, the speed sensor set on the output shaft of the drive motor is used to detect the real-time speed n _M ^S of the drive motor, and the remaining rotation speed sensors are used to detect The real-time rotation speed n _i ^S of each bearing, and the acceleration sensor is used to detect the real-time vibration amplitude a _i ^S of each bearing. The processing module determines whether the real-time vibration amplitude _{a i S} ^of the _bearing exceeds the ^alarm relationship curve f ⁽ a) and the warning relationship curve f ^' ( a).

If the real-time vibration amplitude a _i ^S of the bearing is greater than the alarm relationship curve f (a), the processing module box alarm module, display module and control module will send out signals, and the alarm module will send out an alarm to remind maintenance personnel that there is an escalator failure; the display module The alarm information (i.e. the number of the failed bearing) is displayed so that maintenance personnel can quickly find the fault point of the escalator; the control module controls the drive motor to stop running to reduce the probability of passengers being injured if the escalator runs in a faulty state.

If the vibration amplitude a _i ^S of the bearing is greater than the warning relationship curve f ^' (a) and less than or equal to the alarm relationship curve f (a), the vibration amplitude a _i ^S of the bearing is greater than the warning relationship curve f ^' (a) and The frequency of the alarm relationship _curve ^f ( ^a ) is less than or equal to equal to the first threshold, the processing module also sends signals to the alarm module, display module and control module.

The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be covered by the scope of protection of the present invention. Inside.

Claims (8)

1. A fault diagnosis method for an escalator is characterized by comprising the following steps: the method comprises the following steps:

and (3) no-load detection: detecting a drive motor and each bearing of the no-load escalator, and further obtaining the output torque M of the drive motor when the escalator is no-load _M Output rotation speed n of drive motor _M Vibration amplitude a of bearing _i ^t Rotational speed n of bearing _i I is the serial number of the bearing, and t is the detection time;

bearing vibration amplitude confidence analysis at no load: according to the rotation speed n of the bearing when the escalator is unloaded _i Vibration amplitude a _i ^t Calculating a credible value A of bearing vibration amplitude when the escalator is unloaded ^iZ Trusted value A of bearing vibration amplitude in no-load ^iZ The calculation model of (2) is as follows:

；

wherein A is _i ^Tj For the vibration amplitude interval, k, in the j-th rotation period of the i-th bearing _i The number of turns of the ith bearing in the detection process is the number of turns of the ith bearing in the detection process; a is that _i ^Tj The calculation model of (2) is as follows:

；

and (3) analyzing the torque of the corresponding shaft of the bearing in idle load: according to the output torque M of the drive motor when the escalator is empty _M Output rotation speed n of drive motor _M Rotation speed n of ith bearing _i Calculating the torque M of the shaft corresponding to the ith bearing when the escalator is unloaded _i ，M _i The calculation model of (2) is as follows:

；

determining a relation coefficient: determining a plausible value A of the vibration amplitude at no load ^iZ Torque to shaft M _i Relation coefficient lambda of (2) _i Relation coefficient lambda _i The calculation model of (2) is as follows:

；

determining a relation curve: setting an alarm relation coefficient C, wherein the alarm relation coefficient C is larger than 1, and determining an alarm relation curve f (a) according to the alarm relation coefficient C, wherein the alarm relation curve f (a) has the following formula:

；

wherein M is _i ^S The real-time torque of the shaft corresponding to the ith bearing,

M _i ^S the calculation model of (2) is as follows:

；

wherein: m is M _M ^S For driving the real-time torque of the motor, n _M ^S For driving the real-time rotation speed of the motor, n _i ^S The real-time rotating speed of the ith bearing is set;

and (3) alarm judgment: if under a certain load, the vibration amplitude a of the bearing _i ^S If the alarm relation curve f (a) is larger than the alarm relation curve f (a), executing an alarm step;

and (3) alarming: and sending out an alarm and stopping the operation of the escalator.

2. The escalator fault diagnosis method according to claim 1, wherein: the method is characterized in that a step of acquiring transmission efficiency is further arranged between the step of analyzing the confidence coefficient of the vibration amplitude of the bearing during no-load and the step of analyzing the torque of the corresponding shaft of the bearing during no-load:

obtaining transmission efficiency: according to the transmission mode of the escalator, the transmission efficiency eta between transmission shafts in the escalator is obtained;

in the step of analyzing the torque of the shaft corresponding to the bearing in no-load state, the torque M of the shaft corresponding to the i-th bearing in no-load state of the escalator is calculated according to the transmission efficiency eta _i ；

M _i The calculation model of (c) is modified as follows:

；

wherein eta is _i ^M The total transmission efficiency between the shaft corresponding to the ith bearing and the output shaft of the driving motor; η (eta) _i ^M The calculation model of (2) is as follows:

；

in the step of determining the alarm relationship, M _i ^S The calculation model of (c) is modified as follows:

。

3. the escalator fault diagnosis method according to claim 1 or 2, characterized in that: in the step of the alarm relation curve, an alarm relation coefficient C is also set ^’ Warning relation coefficient C ^’ Is more than 1 and less than the alarm relation coefficient C and according to the alarm relation coefficient C ^’ Determining a warning relation f ^’ (a) Warning relation curve f ^’ (a) The formula is as follows:

；

in the alarm judging step, if under a certain load, the vibration amplitude a of the bearing _i ^S Is greater than the warning relation curve f ^’ (a) And when the vibration amplitude is smaller than or equal to the alarm relation curve f (a), the vibration amplitude a of the bearing is also reduced _i ^S Is greater than the warning relation curve f ^’ (a) And judging the frequency smaller than or equal to the alarm relation curve f (a); if the vibration amplitude a of the bearing is within a unit time _i ^S Is greater than the warning relation curve f ^’ (a) And the number of times smaller than or equal to the alarm relation curve f (a) is larger than or equal to a first threshold value, and executing an alarm step.

4. The escalator fault diagnosis method according to claim 1 or 2, characterized in that: and in the alarming step, the serial number of the fault bearing is also reported.

5. The utility model provides an staircase fault diagnosis system which characterized in that: a method for diagnosing a fault in an escalator as claimed in claim 3, comprising

And a detection module: the device comprises a torque sensor, a plurality of rotating speed sensors and acceleration sensors, wherein the number of the acceleration sensors is the same as that of the bearings; the torque sensors are arranged on the output shaft of the driving motor, one of the rotating speed sensors is arranged on the output shaft of the driving motor, the other rotating speed sensors are arranged on the transmission shaft of the escalator system in a one-to-one correspondence manner, and the acceleration sensors are arranged on the bearings in a one-to-one correspondence manner;

the processing module is used for: the input end is electrically connected with the output end of the detection module and is used for calculating the credible value A of the vibration amplitude of the bearing in no-load through the detection result measured by the detection module ^iZ Coefficient of relationship lambda _i Further, an alarm relation curve f (a) and an alert relation curve f are calculated ^’ (a) The method comprises the steps of carrying out a first treatment on the surface of the And according to the alarm relation curve f (a) and the warning relation curve f ^’ (a) Judging whether the escalator has faults or not;

and a storage module: the input end and the output end are both connected with the processing module through electrical signals and are used for storing information;

and an alarm module: the input end is connected with the output end of the processing module through an electric signal and is used for giving an alarm.

6. The escalator fault diagnosis system according to claim 5, wherein: also included is a selection module for selecting the selected one of the plurality of modules,

the storage module is also provided with a database, and the database is recorded with transmission mode information and transmission efficiency information corresponding to the transmission mode;

and a selection module: the input end is connected with the output end of the storage module, the output end is connected with the input end of the processing module through an electric signal, and the input end is used for selecting the transmission mode recorded in the storage module and outputting the transmission efficiency corresponding to the transmission mode to the processing module.

7. The escalator fault diagnosis system according to claim 5 or 6, wherein: the display device also comprises a display module, wherein the display module is used for displaying the display data,

and a display module: the input end is connected with the output of the processing module and used for displaying alarm information.

8. The escalator fault diagnosis system according to claim 5 or 6, wherein: the device also comprises a control module which is used for controlling the control module,

and the control module is used for: the input end is electrically connected with the output end of the processing module, and the output end is electrically connected with the driving motor of the escalator.