CN112630654A - Band-type brake detection system and method - Google Patents
Band-type brake detection system and method Download PDFInfo
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- CN112630654A CN112630654A CN202011463731.1A CN202011463731A CN112630654A CN 112630654 A CN112630654 A CN 112630654A CN 202011463731 A CN202011463731 A CN 202011463731A CN 112630654 A CN112630654 A CN 112630654A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
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Abstract
The invention relates to the technical field of band-type brake motors, in particular to a band-type brake detection system and a band-type brake detection method, wherein the detection system comprises an electric signal detection unit which is connected with the output end of a band-type brake motor and is used for detecting the working electric signal of the band-type brake motor; the detection unit is used for counting the change times of the working electric signals in the band-type brake period and determining whether the band-type brake is about to fail or not based on the change times. In the normal band-type brake process of the band-type brake motor, the change times of the working electric signals at the output end of the band-type brake motor are known, the working electric signals of the band-type brake motor are detected by the electric signal detection unit, meanwhile, the change times of the working electric signals in the band-type brake period are counted by the detection unit, and whether the band-type brake is about to fail or not can be determined by the change times, so that whether the band-type brake motor is about to fail or not can be judged in advance, the band-type brake system is maintained in time, and the accuracy of band-type brake detection is improved.
Description
Technical Field
The invention relates to the technical field of band-type brake motors, in particular to a band-type brake detection system and a band-type brake detection method.
Background
The working principle of the band-type brake motor can be considered as brake braking, and spring resetting is generally adopted. When the band-type brake motor is electrified, the electromagnetic coil is electrified to generate electromagnetic attraction to automatically open the brake pad; when the brake motor is powered off, the electromagnetic coil is powered off, and the brake pad brakes under the action of the spring force. In order to prevent vertical displacement of the vertical load due to gravity, a motor with a band-type brake is usually used as a driving motor. Under the condition of stopping, when the motor is not excited to enable, the band-type brake driver outputs a band-type brake signal through the band-type brake control circuit, so that the motor is in a braking state to prevent the vertical load from displacing under the action of gravity.
When the brake is abnormal, the brake of the brake motor can be failed, and the possible damage and loss can be immeasurable. Therefore, it is general to detect whether the band brake is abnormal. The method for detecting whether the band-type brake is abnormal in the prior art comprises the following steps: when the motor is in a brake state, whether the motor is in brake failure or not is judged by changing the output torque of the motor.
However, this detection method is to be detected only when a brake anomaly has occurred. The impending abnormity of the brake cannot be detected in time, so that the detection accuracy of the detection method is low.
Disclosure of Invention
In view of this, embodiments of the present invention provide a brake detection system and method to solve the problem of low accuracy of the brake detection method.
According to a first aspect, an embodiment of the present invention provides a brake detection system, including:
the electric signal detection unit is connected with the output end of the band-type brake motor and is used for detecting the working electric signal of the band-type brake motor;
the detection unit is used for counting the change times of the working electric signals in the band-type brake period and determining whether the band-type brake is about to fail or not based on the change times.
According to the band-type brake detection system provided by the embodiment of the invention, in the normal band-type brake process of the band-type brake motor, the change times of the working electric signal at the output end of the band-type brake motor are known, so that the working electric signal of the band-type brake motor is detected by the electric signal detection unit, meanwhile, the detection unit counts the change times of the working electric signal in the band-type brake period, and whether the band-type brake is about to fail can be determined by utilizing the change times, so that whether the band-type brake motor is about to fail can be pre-judged in advance, the band-type brake system can be maintained in time, and the accuracy of band-type brake detection is improved.
With reference to the first aspect, in a first implementation manner of the first aspect, the electrical signal detection unit includes:
the input end of the voltage detection unit is connected with the output end of the contracting brake motor, the output end of the voltage detection unit is connected with the detection unit, the voltage detection unit is used for detecting the working voltage signal of the contracting brake motor in a contracting brake period, so that the detection unit analyzes the working voltage signal to determine whether the contracting brake is about to fail or not, and determines that the contracting brake mechanism is abnormal when determining that the contracting brake is about to fail.
The band-type brake detection system provided by the embodiment of the invention detects the working voltage signal of the band-type brake motor, and the detection unit analyzes whether the band-type brake is about to fail or not based on the working voltage signal in the band-type brake period, so that when the band-type brake motor can still complete the band-type brake, and the band-type brake motor can complete the band-type brake, so that the band-type brake control circuit is normal, and accordingly, the band-type brake detection system can judge whether the band-type brake mechanism is caused by abnormality when the band-type brake is.
With reference to the first embodiment of the first aspect, in a second embodiment of the first aspect, the voltage detection unit includes:
the negative end of the photoelectric coupler is connected with the positive voltage output end of the band-type brake motor, the positive end of the photoelectric coupler is connected with the negative voltage output end of the band-type brake motor, and the output end of the photoelectric coupler is connected with the detection unit; the photoelectric coupler is further used for triggering the detection unit to detect the actual brake time of the brake motor.
According to the band-type brake detection system provided by the embodiment of the invention, the photoelectric coupler has a quick response characteristic and a signal isolation function, and the timeliness of a detection result can be ensured by detecting a voltage signal through the photoelectric coupler; meanwhile, a detection signal is sent to the detection unit when the optocoupler is switched on, and the detection signal is used as trigger to detect the actual brake time of the brake motor, so that the statistics of the actual brake time can be simplified on the premise of confirming the accuracy of the actual brake time; in addition, as the optical coupler needs certain voltage when being conducted, the detection unit utilizes the on-off times of the optical coupler to carry out statistics on the change times of the working voltage signal, and the detection accuracy is improved.
With reference to the first aspect, in a third implementation manner of the first aspect, the band-type brake detection system further includes:
the temperature detection unit is respectively connected with the band-type brake motor and the detection unit and is used for detecting the working temperature of the band-type brake motor; the detection unit is further used for detecting the actual band-type brake time of the band-type brake motor, determining whether the band-type brake is about to fail or not based on the working temperature comparison between the actual band-type brake time and the preset band-type brake time, and judging that the band-type brake mechanism is abnormal when determining that the band-type brake is about to fail.
According to the band-type brake detection system provided by the embodiment of the invention, as the temperature rises, the magnetic flux of the band-type brake coil is reduced, and the band-type brake time is shortened, therefore, based on the comparison between the working temperature and the actual band-type brake time and the preset band-type brake time, whether the band-type brake is about to fail can be determined, and the problem that the band-type brake is about to fail due to the abnormity of the band-type brake mechanism can be detected.
With reference to the third implementation manner of the first aspect, in the fourth implementation manner of the first aspect, within the same temperature range, the detection unit is further configured to detect a difference value of multiple actual braking times of the braking motor, and compare the difference value with a preset difference value to determine whether the braking is about to fail or whether the braking is about to fail.
According to the band-type brake detection system provided by the embodiment of the invention, the time difference value among multiple band-type brakes within the same temperature range is within the preset range, if the band-type brake time variation range is too large, the band-type brake mechanism is unstable in work, if the situation occurs at the beginning, the band-type brake detection system is an unqualified product, and the band-type brake can be judged to be abnormal; if the brake mechanism is used for a period of time, the situation is shown, the service life of the brake mechanism is about to be up, and the brake is about to fail.
With reference to the first aspect, in a fifth implementation manner of the first aspect, the band-type brake detection system further includes:
the rotating speed detection unit is respectively connected with the band-type brake motor and the detection unit and is used for detecting the rotating speed of the band-type brake motor; the control unit is used for determining whether the band-type brake is abnormal or not based on the rotating speed of the band-type brake motor during band-type brake, and determining that the band-type brake mechanism is abnormal when the band-type brake is determined to be abnormal.
According to the band-type brake detection system provided by the embodiment of the invention, the rotating speed of the band-type brake motor is zero after the band-type brake is finished, and if the rotating speed of the band-type brake motor can be still detected, the failure of the band-type brake can be determined, and the reason of the failure of the band-type brake is that a band-type brake mechanism is abnormal.
According to a second aspect, an embodiment of the present invention further provides a method for detecting a brake, where the method includes:
acquiring a working electric signal of a band-type brake motor, wherein the working electric signal is detected by an electric signal detection unit connected with the output end of the band-type brake motor;
counting the change times of the working electric signal in the band-type brake period, and determining whether the band-type brake is about to fail or not based on the change times.
According to the band-type brake detection method provided by the embodiment of the invention, in the normal band-type brake process of the band-type brake motor, the change times of the working electric signal at the output end of the band-type brake motor are known, so that the working electric signal of the band-type brake motor is detected by the electric signal detection unit, meanwhile, the detection unit counts the change times of the working electric signal in the band-type brake period, and whether the band-type brake is about to fail can be determined by utilizing the change times, so that whether the band-type brake motor is about to fail can be pre-judged in advance, the band-type brake system can be maintained in time, and the accuracy of band-type brake detection is improved.
With reference to the second aspect, in a first implementation manner of the second aspect, the determining whether a band-type brake is about to fail based on the number of changes of the operating electrical signal during a band-type brake period includes:
judging whether the change times of the working voltage signal in one band-type brake period is more than 1;
when the change frequency of the working voltage signal is more than 1, determining that the band-type brake is about to fail and judging that a band-type brake mechanism is abnormal;
and when the change frequency of the working voltage signal is 0, determining that the band-type brake fails and judging that a band-type brake control circuit is abnormal, wherein the band-type brake control circuit is connected with the band-type brake motor.
According to the method for detecting the band-type brake, provided by the embodiment of the invention, through analyzing the change times of the working voltage signal of the band-type brake motor in one band-type brake period, the problem of band-type brake failure caused by the abnormity of a band-type brake control circuit can be detected, the problem of the impending band-type brake failure caused by the abnormity of a band-type brake mechanism can be detected, and meanwhile, a reference basis can be provided for judging whether the band-type brake failure of the band-type brake motor is imminent.
With reference to the second aspect, in a second embodiment of the second aspect, the method further comprises:
acquiring the working temperature of the band-type brake motor and preset band-type brake time;
detecting actual brake time used by the brake of the brake motor by using the working electric signal;
based on the working temperature, comparing the actual band-type brake time with a preset band-type brake time, and determining whether the band-type brake is about to fail;
and when determining that the band-type brake is about to fail, judging that the band-type brake mechanism is abnormal.
According to the band-type brake detection method provided by the embodiment of the invention, along with the work of the band-type brake motor, the working temperature is increased, accordingly, the magnetic flux of a band-type brake coil is reduced, and the band-type brake time required for completing one band-type brake is shortened. Therefore, by utilizing the magnitude relation between the actual brake time and the preset brake time, whether the brake is about to fail can be determined, a reference basis is provided for judging whether the brake motor is about to fail, and the accuracy of the detection method is improved.
With reference to the second aspect and the second embodiment, in a third embodiment of the second aspect, the method further comprises:
acquiring multiple actual brake time of the brake motor within the same temperature range;
calculating the difference value between multiple times of actual brake holding time;
judging whether the difference value is larger than a preset difference value or not;
and when the difference value is larger than the preset difference value, determining that the band-type brake is about to fail or the band-type brake fails.
According to the method for detecting the band-type brake, provided by the embodiment of the invention, the difference value between multiple times of actual band-type brake time within the same temperature range is within the preset difference value, and if the difference value changes greatly, the band-type brake is determined to be about to fail or the band-type brake is failed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic voltage variation diagram of a band-type brake motor according to an embodiment of the invention;
fig. 2 is a block diagram of a band-type brake detection system according to an embodiment of the invention;
fig. 3 is a block diagram of a band-type brake detection system according to an embodiment of the invention;
fig. 4 is a flowchart of a brake detection method according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for detecting a brake according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the operating principle of the band-type brake motor is as follows: after the contracting brake coil is electrified, the middle magnetic sheet is attracted to one side of the coil base, the contracting brake sheet is opened, and the contracting brake is released; when the power of the band-type brake coil is cut off, the magnetic flux on the coil base is gradually reduced, when the magnetic attraction is smaller than the spring force, the middle magnetic sheet is released, and the pressure generated by the spring compresses the band-type brake sheet to generate band-type brake torque, so that the band-type brake effect is realized.
The inventor obtains a schematic voltage change diagram of the band-type brake motor in the band-type brake process shown in fig. 1 through multiple experimental analysis. As can be seen from fig. 1, a certain time Tr is required from the power-off of the brake motor to the completion of the brake. In the following description, this time is referred to as a preset brake application time. The voltage of a brake motor is changed in the brake process; and once contracting brake action, the voltage of the contracting brake motor is changed once.
Based on this, the embodiment of the invention provides a band-type brake detection system. This band-type brake detecting system is connected with the band-type brake motor, the band-type brake motor be connected with the band-type brake drive, the band-type brake drive be used for sending band-type brake control signal to the band-type brake motor.
As shown in fig. 2, the band-type brake detection system includes: an electrical signal detection unit 10 and a detection unit 20. The electric signal detection unit 10 is connected with an output end of the band-type brake motor and used for detecting a working electric signal of the band-type brake motor. The detection unit 20 may be a processor, a high-speed IO, or the like, and is not limited herein.
The operating electrical signal may be a voltage signal or a current signal, and is not limited herein. When the detected working electrical signal is a voltage signal, the detection may be performed by a voltage detection unit, for example, an oscilloscope or the like; when the detected operating electrical signal is a current signal, the detection may be performed by a current detection unit, for example, a hall sensor or the like. The detection device for the working electrical signal is not limited at all, and may be set according to actual conditions. In the following description, the operation electrical signal is taken as an operation voltage signal as an example for detailed description, and accordingly, the electrical signal detection unit is a voltage detection unit.
As mentioned above, the voltage of the brake motor changes during one braking process, i.e. one braking period. The voltage detection unit sends the detected working voltage signal of the band-type brake motor to the detection unit 20. The detection unit 20 counts the change times of the working voltage signal of the band-type brake motor in the band-type brake period based on the principle, and determines whether the band-type brake is about to fail based on the change times.
Specifically, the voltage detection unit sends the detected working voltage signal to the detection unit, and the detection unit may analyze the working voltage signal, for example, a voltage curve of the working voltage signal may be analyzed to determine the number of changes of the working electrical signal in one band-type brake period; or after the working voltage signal is obtained, the magnitude of the adjacent voltage values is compared to determine whether the working voltage signal has sudden change, and the number of times of the sudden change is used for determining the number of times of the change of the working electric signal in one band-type brake period.
The band-type brake detecting system that this embodiment provided, at the normal band-type brake in-process of band-type brake motor, the change number of times of the work signal of telecommunication of its output is known, utilize the electric signal detecting element to detect the work signal of telecommunication of band-type brake motor so, detecting element makes statistics of the change number of times of the work signal of telecommunication in the band-type brake cycle simultaneously, utilize this change number of times can confirm whether the band-type brake is about to become invalid, thereby can prejudge whether the band-type brake motor is about to take place the band-type brake to become invalid in advance, so that in time maintain the band-type brake system, the accuracy that the band-type brake detected has.
In an optional implementation manner of this embodiment, the electrical signal detecting unit 10 is a voltage detecting unit, an input end of which is connected to an input end of the band-type brake motor, and an output end of which is connected to the detecting unit 20. The voltage detection unit is used for detecting working voltage signals of the band-type brake motor in a band-type brake period, so that the detection unit analyzes the working voltage signals, determines whether the band-type brake is about to fail or not, and judges that the band-type brake mechanism is abnormal when determining that the band-type brake is about to fail.
Specifically, if the working electric signal changes once in one band-type brake period, the band-type brake can be determined to be normal at the moment; if the working electric signal is not changed, the brake failure can be determined at the moment; if the change times of the working electric signal are more than 1, the fact that the internal contracting brake is likely to fail at the moment is shown. That is, in the braking process of the band-type brake motor, if the detection unit 20 detects that the working voltage signal of the band-type brake voltage does not change, it can be determined that the band-type brake control circuit is abnormal and the band-type brake fails; if the detecting unit 20 detects that the working voltage signal of the contracting brake motor changes twice or more, it can be determined that the contracting brake mechanism is damaged and the contracting brake is about to fail.
The band-type brake control circuit comprises a band-type brake control circuit inside the driver and output ends 'BK +' and 'BK-' connected to the band-type brake motor, and release and braking of the band-type brake are achieved by controlling ON (ON) and OFF (OFF) of the output ends. If the band-type brake control circuit is not abnormal, voltage change is inevitably generated between BK + 'and BK-' during band-type brake braking regardless of whether the band-type brake mechanism is damaged; otherwise, the brake control circuit is abnormal.
The detection system detects the working voltage signal of the contracting brake motor, and the detection unit analyzes whether the contracting brake is about to fail or not based on the working voltage signal in the contracting brake period, so that when the contracting brake motor can still complete contracting brake, the contracting brake control circuit is normal, and accordingly, the abnormal condition caused by the abnormal contracting brake mechanism can be judged.
In some optional implementations of this embodiment, the voltage detection unit includes a photo coupler. The negative end of the photoelectric coupler is connected with the positive voltage output end of the band-type brake motor, the positive end of the photoelectric coupler is connected with the negative voltage output end of the band-type brake motor, and the output end of the photoelectric coupler is connected with the detection unit.
As shown in fig. 3, the band-type brake driver 30 is connected to the band-type brake motor 40, and the band-type brake driver 30 transmits a band-type brake control signal to the band-type brake motor 40 and is connected to an input end of the photocoupler in parallel. The band-type brake control signal is transmitted to the detection unit 20 through the photo coupler. The negative end (X2) of the photoelectric coupler is connected with the positive voltage output end (BK +) of the band-type brake motor 40, and the positive end (X1) of the photoelectric coupler is connected with the negative voltage output end (BK-) of the band-type brake motor 40.
Specifically, when the band-type brake motor 40 is electrified, a positive voltage is generated between the BK + and BK-of the band-type brake motor 40, and the photoelectric coupler is not conducted at the moment due to the reversed polarity of the photoelectric coupler; when the brake motor is powered off, the brake motor 40 generates a counter electromotive force, namely, a negative voltage is generated between the BK + and BK-of the brake motor 40, and at the moment, the photoelectric coupler is electrically conducted. Corresponding to the detecting unit 20, when the photocoupler is powered on, the detecting unit 20 can detect the voltage jump, and at this time, the voltage jump can be recorded as the change of the primary operating voltage signal.
Furthermore, the detection unit can also use the voltage abrupt change as a trigger signal to trigger the detection unit to detect the brake-contracting time. Namely, the photoelectric coupler is also used for triggering the detection unit to detect the actual brake time of the brake motor. When the photoelectric coupler is electrified and conducted, the detection unit immediately starts timing, the band-type brake piece is completely compressed along with the lapse of time, the counter electromotive force output by the band-type brake motor tends to 0, when a certain critical value is reached, the photoelectric coupler is changed from a conduction state to a non-conduction state, and the timing of the detection unit is finished. The time used in the process is the actual brake time of the brake motor.
And in combination with the detection of the change times of the working voltage signal of the band-type brake motor in a band-type brake period, the detection unit can determine the change times by utilizing the on-off times of the photoelectric coupler. If the photoelectric coupler is switched on and off for multiple times in one band-type brake period, the working voltage signal of the band-type brake motor is changed for multiple times, and at the moment, the band-type brake mechanism can be judged to be damaged, and the band-type brake is about to fail. Because the optical coupler needs to have a certain voltage threshold value when being switched on, if the voltage of a brake coil changes for many times in the same brake process and the optical coupler can be triggered to work, the brake mechanism generates vibration with larger amplitude in the brake process, and the vibration is caused by the damage of the brake mechanism.
The photoelectric coupler has the advantages that the photoelectric coupler has the rapid response characteristic and the signal isolation function, and the voltage signal can be detected by the photoelectric coupler, so that the timeliness of a detection result can be ensured; meanwhile, a detection signal is sent to the detection unit when the optocoupler is switched on, and the detection signal is used as trigger to detect the actual brake time of the brake motor, so that the statistics of the actual brake time can be simplified on the premise of confirming the accuracy of the actual brake time; in addition, as the optical coupler needs certain voltage when being conducted, the detection unit utilizes the on-off times of the optical coupler to carry out statistics on the change times of the working voltage signal, and the detection accuracy is improved.
In other optional embodiments of this embodiment, as shown in fig. 3, the band-type brake detection system further includes a temperature detection unit 60. The temperature detecting unit 60 is connected to the detecting unit 20, and is configured to detect an operating temperature of the band-type brake motor, and send the detected operating temperature to the detecting unit.
As described above, as the detection time goes by, the contracting brake motor drives the load to continuously reciprocate, and the working temperature of the contracting brake motor will rise. Under normal conditions, the actual brake holding time of the same load and the same speed is also shortened due to the fact that the speed is increased and the magnetic flux is reduced. Therefore, the detection unit can detect the actual brake time of the brake motor based on the principle, compare the detected actual brake time with the preset brake time Tr, determine whether the brake is about to fail, and determine that the brake mechanism is abnormal when determining that the brake is about to fail.
Specifically, the preset brake time Tr may be measured at a preset temperature (e.g., 25 ℃), and if the temperature detection unit detects that the working temperature of the brake motor is 50 ℃ at this time, since the working temperature is greater than the preset temperature, the corresponding brake time should be less than the preset brake time Tr. The detection unit detects that the actual brake time of the brake motor is T, the actual brake time T is compared with the preset brake time Tr, and if the actual brake time T is larger than the preset brake time Tr, the fact that the motor brake is about to fail can be judged.
Since the actual brake application time T becomes long, the brake application can be completed, and it cannot be determined as a failure. If the brake is continuously used under the condition, the real internal contracting brake fails after a period of time, so that the brake is judged to be about to fail. The failure reason can be that the spring force is reduced, so that the time for pressing the brake sheet is prolonged, or the internal generated debris affects the brake action, and belongs to the abnormity of the brake mechanism.
Further, under normal conditions, the actual brake time T used by the brake motor for multiple times of brake application is within a specified range under the same load, the same speed and the same temperature range. If the detecting unit detects that the difference value between the multiple actual brake holding times of the brake motor is larger than the preset difference value, it can be judged that the brake of the brake motor is abnormal or the brake is about to fail.
When designing a band-type brake circuit, the band-type brake time is used as a parameter to be standardized, a certain tolerance is allowed, and if the band-type brake time exceeds the tolerance range, the band-type brake (abnormal) can be judged. Correspondingly, if the band-type brake is carried out for multiple times under the same condition, the change range of the band-type brake time is too large, which indicates that the band-type brake mechanism is unstable in work, and if the situation occurs at the beginning, the band-type brake is an unqualified product and can be judged to be abnormal; if the brake mechanism is used for a period of time, the situation is shown that the service life of the brake mechanism is up to the end, and the brake is about to fail, so that two possibilities are available.
As an optional implementation manner of this embodiment, as shown in fig. 3, the band-type brake detection system further includes a rotation speed detection unit 50, which is connected to the band-type brake motor and the detection unit, respectively, and is configured to detect a rotation speed of the band-type brake motor, and send the detected rotation speed to the control unit. The control unit is used for determining whether the band-type brake is abnormal or not based on the rotating speed of the band-type brake motor during band-type brake, and judging that the band-type brake mechanism is abnormal when the band-type brake is determined to be abnormal.
The rotating speed detection unit can be an encoder, and the encoder is connected with a rotating shaft of the band-type brake motor; other rotation speed detecting means may be used. The specific structure of the rotating speed detection unit is not limited at all, and only the rotating speed of the contracting brake motor can be detected.
Specifically, after the band-type brake is finished, the rotation speed of the band-type brake motor should be zero. If the rotating speed detection unit still detects the rotating speed of the contracting brake motor, the contracting brake motor is dragged by the load to generate displacement. If the rotating speed of the contracting brake motor can be detected, the abnormity of the contracting brake mechanism can be judged, and the contracting brake is invalid.
The contracting brake detection system provided by the embodiment of the invention fully utilizes the working principle of the contracting brake mechanism, can detect the contracting brake failure problem caused by the control circuit fault and the contracting brake failure problem caused by the abnormity of the contracting brake mechanism, and can provide reference basis for judging whether the contracting brake motor is about to generate contracting brake failure. Namely, the band-type brake detection system can accurately detect the abnormality of the band-type brake control circuit and the abnormality of the band-type brake mechanism, and can also timely detect the impending band-type brake failure.
The embodiment of the invention also provides a brake detection method which is applied to the detection unit in the brake detection system. The contracting brake detection method depends on the contracting brake detection system, and for the details of the contracting brake detection system, please refer to the above description, which is not repeated herein. As shown in fig. 4, the method includes:
and S11, acquiring the working electric signal of the band-type brake motor.
The working electric signal is detected by an electric signal detection unit connected with the output end of the band-type brake motor and is sent to the detection unit.
And S12, counting the change times of the working electric signals in the band-type brake period, and determining whether the band-type brake is about to fail or not based on the change times.
The detection unit analyzes the obtained working electric signal and determines the change times of the working electric signal in the band-type brake period. As described above, the determination of the number of changes may be obtained by analyzing the voltage change curve by the detection unit, or may be obtained by using the on-off number of the photoelectric coupler, and so on.
According to the contracting brake principle of the contracting brake motor, the working signal of the contracting brake motor changes within a contracting brake period, and the change times are known. Based on the above, after the detection unit obtains the number of changes of the working electric signal in the band-type brake cycle, the number of changes can be used for determining whether the band-type brake is about to fail.
According to the band-type brake detection method provided by the embodiment, in the normal band-type brake process of the band-type brake motor, the change times of the working electric signals at the output end of the band-type brake motor are known, the working electric signals of the band-type brake motor are detected by the electric signal detection unit, meanwhile, the change times of the working electric signals in the band-type brake period are counted by the detection unit, and whether the band-type brake is about to fail can be determined by the change times, so that whether the band-type brake motor is about to fail can be pre-judged in advance, the band-type brake system can be maintained in time, and the accuracy of band-type brake detection is improved.
In some optional implementations of this embodiment, the step S12 may include the following steps:
(1) and judging whether the change times of the working voltage signal in one band-type brake period is more than 1.
Under normal conditions, the working voltage signal of the band-type brake motor only changes once in one band-type brake period. The control unit judges whether the change times of the working voltage signal of the band-type brake motor in one band-type brake period is larger than 1, and then whether the band-type brake is abnormal can be determined.
(2) And when the change times of the working voltage signal is more than 1, determining that the band-type brake is about to fail and judging that the band-type brake mechanism is abnormal.
When the change times of the working voltage signal is more than 1, the change of the working voltage signal of the band-type brake motor for many times is shown. Although the brake can be completed at this time, the number of changes of the operating voltage signal is large in the process, which indicates that the brake is about to fail, and the failure is caused by an abnormal brake mechanism.
(3) And when the change frequency of the working voltage signal is 0, determining that the band-type brake fails and judging that a band-type brake control circuit is abnormal, wherein the band-type brake control circuit is connected with a band-type brake motor.
The detection unit detects that the working voltage signal of the band-type brake motor does not change, and at the moment, the band-type brake is invalid and the band-type brake control circuit is abnormal. Because the contracting brake signal is sent to the contracting brake motor through the contracting brake control circuit, if the contracting brake motor carries out contracting brake action, the contracting brake control circuit is abnormal at the moment.
By analyzing the change times of the working voltage signals of the band-type brake motor in one band-type brake period, the problem of band-type brake failure caused by the abnormity of a band-type brake control circuit can be detected, the problem of band-type brake imminent failure caused by the abnormity of a band-type brake mechanism can be detected, and meanwhile, a reference basis can be provided for judging whether the band-type brake motor is imminent to fail.
The embodiment of the invention also provides a brake detection method, which depends on the brake detection system, and the details of the detection system are referred to above, and are not described herein again. As shown in fig. 5, the method includes:
s201, acquiring a working electric signal of the band-type brake motor.
The working electric signal is detected by an electric signal detection unit connected with the output end of the band-type brake motor.
Please refer to S11 in fig. 4 for details, which are not described herein.
S202, counting the change times of the working electric signals in the band-type brake period, and determining whether the band-type brake is about to fail or not based on the change times.
Please refer to S12 in fig. 4 for details, which are not described herein.
S203, acquiring the working temperature of the band-type brake motor and the preset band-type brake time.
The working temperature of the band-type brake motor is detected by the temperature detection unit, and the preset band-type brake time can be preset or detected under the condition that the band-type brake is normal.
And S204, detecting actual brake time used by the brake of the brake motor by using the working electric signal.
As described above, the detection unit may analyze the working electrical signal to determine the actual brake time for one brake; the on-off of the photoelectric coupler can be used for triggering the brake timing, and the actual brake time can be determined.
S205, comparing the actual brake time with the preset brake time based on the working temperature, and determining whether the brake is about to fail.
Based on the working principle of the band-type brake motor, along with the lapse of operating time, the operating temperature of the band-type brake motor rises, its magnetic flux reduces, and band-type brake time shortens. The detection unit compares the detected actual band-type brake time with the preset band-type brake time based on the working temperature, and determines whether the band-type brake is about to fail.
Executing S206 when determining that the band-type brake is about to fail; otherwise, S207 may be performed to continue the subsequent detection.
And S206, judging that the brake mechanism is abnormal.
And S207, acquiring multiple actual brake time of the brake motor within the same temperature range.
The detection unit can record the temperature corresponding to the actual brake time every time, so that the multiple actual brake time of the brake motor in the same temperature range can be obtained.
And S208, calculating the difference value between the multiple times of actual brake holding time.
The detection unit calculates the difference between any two actual brake time, and can use the average value of the difference or other statistical values of the difference as the difference between multiple actual brake times.
S209, judging whether the difference value is larger than a preset difference value.
When the difference is greater than the preset difference, executing S210; otherwise, carrying out the contracting brake detection of the next period again.
S210, determining that the band-type brake is about to fail or the band-type brake fails.
According to the band-type brake detection method provided by the embodiment, along with the work of the band-type brake motor, the working temperature of the band-type brake motor rises, accordingly, the magnetic flux of a band-type brake coil is reduced, and the band-type brake time required for completing one band-type brake is shortened. Therefore, by utilizing the magnitude relation between the actual brake time and the preset brake time, whether the brake is about to fail can be determined, a reference basis is provided for judging whether the brake motor is about to fail, and the accuracy of the detection method is improved; in addition, the difference value between multiple actual brake holding times in the same temperature range is within a preset difference value, and if the difference value changes greatly, it can be determined that the brake is about to fail or the brake is failed.
It should be noted that, in the detection method in the foregoing embodiment, the context between the described steps is only an example, and the protection scope of the present invention is not limited thereto, and may be adjusted according to the actual situation.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A brake detection system, comprising:
the electric signal detection unit is connected with the output end of the band-type brake motor and is used for detecting the working electric signal of the band-type brake motor;
the detection unit is used for counting the change times of the working electric signals in the band-type brake period and determining whether the band-type brake is about to fail or not based on the change times.
2. The brake detection system according to claim 1, wherein the electric signal detection unit comprises:
the input end of the voltage detection unit is connected with the output end of the contracting brake motor, the output end of the voltage detection unit is connected with the detection unit, the voltage detection unit is used for detecting the working voltage signal of the contracting brake motor in a contracting brake period, so that the detection unit analyzes the working voltage signal to determine whether the contracting brake is about to fail or not, and determines that the contracting brake mechanism is abnormal when determining that the contracting brake is about to fail.
3. The brake detection system according to claim 2, wherein the voltage detection unit comprises:
the negative end of the photoelectric coupler is connected with the positive voltage output end of the band-type brake motor, the positive end of the photoelectric coupler is connected with the negative voltage output end of the band-type brake motor, and the output end of the photoelectric coupler is connected with the detection unit; the photoelectric coupler is further used for triggering the detection unit to detect the actual brake time of the brake motor.
4. The brake detection system according to claim 1, further comprising:
the temperature detection unit is respectively connected with the band-type brake motor and the detection unit and is used for detecting the working temperature of the band-type brake motor; the detection unit is further used for detecting the actual band-type brake time of the band-type brake motor, determining whether the band-type brake is about to fail or not based on the working temperature comparison between the actual band-type brake time and the preset band-type brake time, and judging that the band-type brake mechanism is abnormal when determining that the band-type brake is about to fail.
5. The brake detection system according to claim 4, wherein the detection unit is further configured to detect a difference value between multiple actual brake application times of the brake motor within the same temperature range, and compare the difference value with a preset difference value to determine whether a brake is about to fail or whether the brake is failed.
6. The brake detection system according to claim 1, further comprising:
the rotating speed detection unit is respectively connected with the band-type brake motor and the detection unit and is used for detecting the rotating speed of the band-type brake motor; the control unit is used for determining whether the band-type brake is abnormal or not based on the rotating speed of the band-type brake motor during band-type brake, and judging that the band-type brake mechanism is abnormal when the band-type brake is determined to be abnormal.
7. A brake detection method is characterized by comprising the following steps:
acquiring a working electric signal of a band-type brake motor, wherein the working electric signal is detected by an electric signal detection unit connected with the output end of the band-type brake motor;
counting the change times of the working electric signal in the band-type brake period, and determining whether the band-type brake is about to fail or not based on the change times.
8. The method for detecting the brake according to claim 7, wherein the working electrical signal is a working voltage signal, and the counting the number of changes of the working electrical signal in a brake cycle and determining whether the brake is about to fail based on the number of changes comprises:
judging whether the change times of the working voltage signal in one band-type brake period is more than 1;
when the change frequency of the working voltage signal is more than 1, determining that the band-type brake is about to fail and judging that a band-type brake mechanism is abnormal;
and when the change frequency of the working voltage signal is 0, determining that the band-type brake fails and judging that a band-type brake control circuit is abnormal, wherein the band-type brake control circuit is connected with the band-type brake motor.
9. The brake detection system of claim 7, wherein the method further comprises:
acquiring the working temperature of the band-type brake motor and preset band-type brake time;
detecting actual brake time used by the brake of the brake motor by using the working electric signal;
based on the working temperature, comparing the actual band-type brake time with a preset band-type brake time, and determining whether the band-type brake is about to fail;
and when determining that the band-type brake is about to fail, judging that the band-type brake mechanism is abnormal.
10. The brake detection system of claim 9, wherein the method further comprises:
acquiring multiple actual brake time of the brake motor within the same temperature range;
calculating the difference value between multiple times of actual brake holding time;
judging whether the difference value is larger than a preset difference value or not;
and when the difference value is larger than the preset difference value, determining that the band-type brake is about to fail or the band-type brake fails.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011463731.1A CN112630654A (en) | 2020-12-11 | 2020-12-11 | Band-type brake detection system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011463731.1A CN112630654A (en) | 2020-12-11 | 2020-12-11 | Band-type brake detection system and method |
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| CN112630654A true CN112630654A (en) | 2021-04-09 |
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| CN202011463731.1A Withdrawn CN112630654A (en) | 2020-12-11 | 2020-12-11 | Band-type brake detection system and method |
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