阅读说明：本技术 一种碳刷的实时在线监测系统 (Real-time online monitoring system of carbon brush ) 是由 贺文健 熊康军 刘武奎 贾刚 胡俊轩 于 2019-11-01 设计创作，主要内容包括：本发明提供一种碳刷的实时在线监测系统,包括电机转子、电机滑环、刷握、碳刷、温度监测单元、位移监测单元、控制单元,所述控制单元包括数据处理单元、显示单元、报警单元,所述位移监测单元监测位移、振幅以及振动频率,在显示单元上显示,并与预设值进行对比,超过预设值报警单元进行报警提醒,所述数据处理单元根据位移监测单元监测所得的位移数据以及计算公式计算碳刷温度梯度差,再结合温度监测单元监测的温度计算出零点处的温度和碳刷前端的温度,在显示单元上显示供查看,并且与预设温度对比,超过预设温度报警单元进行报警提醒。本发明通过实时在线监测碳刷的温度和位移、振幅、振动频率,提高测量准确性,避免了重大安全事故的发生。(The invention provides a real-time online monitoring system of a carbon brush, which comprises a motor rotor, a motor slip ring, a brush holder, the carbon brush, a temperature monitoring unit, a displacement monitoring unit and a control unit, wherein the control unit comprises a data processing unit, a display unit and an alarm unit, the displacement monitoring unit monitors displacement, amplitude and vibration frequency, the displacement, the amplitude and the vibration frequency are displayed on the display unit and are compared with preset values, the alarm unit alarms and reminds when the displacement, the displacement and vibration frequency exceed the preset values, the data processing unit calculates a carbon brush temperature gradient difference according to displacement data obtained by monitoring of the displacement monitoring unit and a calculation formula, then calculates the temperature at a zero point and the temperature at the front end of the carbon brush according to the temperature monitored by the temperature monitoring unit, the temperature is displayed on the display unit for viewing and is compared with the preset temperature, and. According to the invention, the temperature, displacement, amplitude and vibration frequency of the carbon brush are monitored on line in real time, so that the measurement accuracy is improved, and major safety accidents are avoided.)

1. A real-time online monitoring system of a carbon brush is characterized by comprising a motor rotor, a motor slip ring, a brush holder, the carbon brush, a temperature monitoring unit embedded in the carbon brush, a displacement monitoring unit fixedly arranged at the brush holder and a control unit connected with the temperature monitoring unit and the displacement monitoring unit, wherein the displacement monitoring unit is arranged at a position flush with the temperature monitoring unit and takes the position as a zero point, the control unit comprises a data processing unit, a display unit and an alarm unit, the displacement monitoring unit monitors the displacement, the amplitude and the vibration frequency of the carbon brush, the displacement monitoring unit displays the displacement, the amplitude and the vibration frequency on the display unit for checking and compares the displacement with a preset value, the alarm unit alarms and reminds when the displacement, the data processing unit calculates the temperature gradient difference of the carbon brush according to displacement data obtained by monitoring of the displacement monitoring unit and a calculation formula, and calculates the temperature at the zero point and the temperature at the front end of the carbon brush by combining with the, and displaying on the display unit for viewing, comparing with the preset temperature, and alarming and reminding when the temperature exceeds the preset temperature.

2. The system for monitoring the carbon brush in real time on line according to claim 1, wherein the calculation formula is T = f (x) = kx, and the temperature at zero point is:

T₁=T_x-T，

wherein x is the displacement of the carbon brush monitored by the displacement monitoring unit, T is the temperature gradient difference, k is the heat conduction coefficient of the carbon brush, and T is_xThe temperature T of the carbon brush after the displacement x monitored by the temperature monitoring unit₁Temperature at zero point.

3. The real-time online monitoring system of the carbon brush according to claim 2, wherein a temperature calculation formula of a front end of the carbon brush is as follows:

T_A=T_x+k(L-x)

wherein x is the displacement of the carbon brush monitored by the displacement monitoring unit, k is the heat conduction coefficient of the carbon brush, and T_xThe temperature of the carbon brush after the displacement x is monitored by the temperature monitoring unit, L is the original length of the carbon brush, and T is_AThe temperature of the front end of the carbon brush is shown.

4. The real-time online monitoring system of the carbon brush according to claim 3, wherein a safety grid is arranged between the carbon brush and the control unit to protect the control unit from electric shock.

5. The real-time online monitoring system for the carbon brush according to claim 3, wherein the control unit further comprises a storage battery, the storage battery supplies electric energy to the control unit, the displacement monitoring unit and the temperature monitoring unit, and the storage battery can be charged by an external power supply.

6. The real-time online monitoring system for the carbon brush according to claim 3, wherein the temperature monitoring unit is a platinum thermistor.

Technical Field

The invention belongs to the technical field of carbon brush monitoring, and particularly relates to a real-time online monitoring system for a carbon brush.

Background

Carbon brushes are used as sliding contacts for the current supply to the commutator or slip rings of an electric machine and are important components of an electric generator. In the working process of the generator, the carbon brush always rubs the slip ring, the carbon brush needs to be replaced after the abrasion length of the carbon brush exceeds the process permission range, and electric spark erosion can be generated in the moment of reversing, so that the carbon brush of the motor is a quick-wear part, the abrasion loss is increased, the displacement of the carbon brush is increased, the vibration frequency and the vibration amplitude can be influenced, the reduction of the length of the carbon brush can cause the over-high temperature of the carbon brush, and the shutdown accident of a power plant unit can be seriously caused.

At present, in a monitoring system for operation of a power plant, temperature is generally monitored by regularly measuring the temperature of a carbon brush through an infrared thermometer, because the working environment of carbon brush equipment is influenced by various factors such as dust, the infrared thermometer often cannot obtain reliable temperature data, the inspection time interval is long, real-time online monitoring cannot be realized, the abrasion condition of the carbon brush and the change of the length of the carbon brush are checked by using the naked eyes, the operation of the mode is long, the inspection worker has safety risks in the inspection process, on the other hand, because the mode of manual inspection is adopted, the current change of the carbon brush in the working process is large, and the change is fast, so that the collected parameters are not of actual reference significance, and the detection result is very inaccurate.

Disclosure of Invention

The invention provides a real-time online monitoring system of a carbon brush, which is used for monitoring the displacement and the temperature of the carbon brush at the same time, establishing a relationship between the displacement and the temperature of the carbon brush, improving the measurement accuracy and giving an alarm in time.

The technical scheme of the invention is as follows: a real-time online monitoring system of a carbon brush comprises a motor rotor, a motor slip ring, a brush holder, the carbon brush, a temperature monitoring unit embedded in the carbon brush, a displacement monitoring unit fixedly arranged at the brush holder, and a control unit connected with the temperature monitoring unit and the displacement monitoring unit, wherein the displacement monitoring unit is arranged at a position flush with the temperature monitoring unit, the position of the displacement monitoring unit is taken as a zero point, the control unit comprises a data processing unit, a display unit and an alarm unit, the displacement monitoring unit monitors the displacement, the amplitude and the vibration frequency of the carbon brush to be displayed on the display unit for checking, the displacement, the amplitude and the vibration frequency are compared with preset values, the alarm unit alarms and reminds when the displacement, the data processing unit calculates the temperature gradient difference of the carbon brush according to displacement data obtained by monitoring of the displacement monitoring unit and a calculation formula, and then calculates the temperature at the zero point and the temperature at the front end of the carbon, and displaying on the display unit for viewing, comparing with the preset temperature, and alarming and reminding when the temperature exceeds the preset temperature.

Further, the calculation formula is T = f (x) = kx, and the temperature at zero point is T₁=T_x-T, wherein x is the displacement of the carbon brush monitored by the displacement monitoring unit, T is the temperature gradient difference, k is the heat conduction coefficient of the carbon brush, T_xThe temperature T of the carbon brush after the displacement x monitored by the temperature monitoring unit₁The temperature at the zero point and the temperature calculation formula at the front end of the carbon brush are T_A=T_x+ k (L-x), L being the original length of the carbon brush.

The safety grid is arranged between the carbon brush and the control unit and used for protecting the control unit and preventing the control unit from being subjected to electric shock.

The scheme is further that the control unit further comprises a storage battery, the storage battery provides electric energy for the control unit, the displacement monitoring unit and the temperature monitoring unit, and the storage battery can be charged through an external power supply.

Further, the temperature monitoring unit is a platinum thermistor.

The invention has the advantages that: according to the invention, the temperature, displacement, amplitude and vibration frequency of the carbon brush are monitored on line in real time, so that the measurement accuracy is improved, timely alarm can be realized, and major safety accidents are avoided.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a block diagram of the present invention;

wherein: 1. the device comprises a motor rotor, 2, a motor slip ring, 3, a carbon brush, 4, a temperature monitoring unit, 5, a brush holder, 6, a displacement monitoring unit, 7, a control unit, 8, a data processing unit, 9, a display unit, 10 and an alarm unit.

Detailed Description

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which a person skilled in the art can, without any creative effort, fully implement the present invention.

The specific implementation mode of the invention is as follows: as shown in fig. 1 and 2, a real-time online monitoring system for a carbon brush comprises a motor rotor 1, a motor slip ring 2, a brush holder 5, a carbon brush 3, a temperature monitoring unit 4 embedded inside the carbon brush 3, a displacement monitoring unit 6 fixedly arranged at the brush holder 5, and a control unit 7 connected with the temperature monitoring unit 4 and the displacement monitoring unit 6, wherein the displacement monitoring unit 6 is arranged at a position flush with the temperature monitoring unit 4, the position where the displacement monitoring unit starts is taken as a zero point, the monitored displacement is the moving distance of the temperature monitoring unit 4, the control unit 7 comprises a data processing unit 8, a display unit 9 and an alarm unit 10, the displacement monitoring unit 6 monitors the displacement, the amplitude and the vibration frequency of the carbon brush, the displacement monitoring unit 6 directly measures the displacement variation, and the vibration frequency and the vibration amplitude in unit time can be calculated through the control unit 7, and the data processing unit 8 calculates the gradient difference of the carbon brush temperature according to the displacement data obtained by monitoring by the displacement monitoring unit 6 and a calculation formula, calculates the temperature at the zero point and the temperature at the front end of the carbon brush by combining the temperature monitored by the temperature monitoring unit 4, displays the temperature on the display unit 9 for checking, compares the temperature with the preset temperature, and alarms and reminds when the temperature exceeds the preset temperature alarm unit 10.

Further, the calculation formula is T = f (x) = kx, and the temperature at zero point is T₁=T_x-T, where x is the displacement of the carbon brush monitored by the displacement monitoring unit 6, T is the temperature gradient difference, k is the heat conduction coefficient of the carbon brush, T_xFor temperature monitoringCarbon brush temperature, T, after displacement x monitored by unit 4₁The temperature at the zero point and the temperature calculation formula at the front end of the carbon brush 3 are T_A=T_x+ k (L-x), L is the original length of carbon brush 3, can obtain the temperature of carbon brush 3 many places position through monitoring displacement and temperature, and the temperature of brush holder 5 and carbon brush 3 front end influences the life-span of carbon brush very much, calculates the temperature of two places according to the monitoring data, and no matter which department exceeds the temperature default value can report to the police in advance, further guarantees the safe operation of carbon brush 3 to avoid the emergence of unit incident.

Further, a safety grid is arranged between the carbon brush 3 and the control unit 7 for protecting the control unit 7 from electric shock.

Further, the control unit 7 further comprises a storage battery, the storage battery provides electric energy for the control unit 7, the displacement monitoring unit 6 and the temperature monitoring unit 4, and the storage battery can be charged through an external power supply.

Further, the temperature monitoring unit 4 is a platinum thermistor.

In conclusion, the temperature monitoring unit 4 is embedded in the carbon brush 3 to monitor the temperature of the carbon brush 3, so that the service life of the carbon brush 3 is prevented from being influenced by overhigh temperature, and a displacement monitoring unit 6 is fixedly arranged at the brush holder 5 of the carbon brush 3 to monitor the displacement of the carbon brush 3 in the using process, as is well known, along with the prolonging of the using time of the carbon brush 3, the carbon brush 3 is abraded, the displacement can occur, the distance between the tail part and the motor is shortened, a temperature gradient exists on the carbon brush 3, along with the shortening of the distance, namely the length of the carbon brush 3 is reduced, the temperature of the tail part of the carbon brush 3 is increased, the temperature of the position and the temperature of the front end of the carbon brush are calculated and monitored based on the displacement temperature gradient relation, the safety is further improved through monitoring, the amplitude and the frequency can also be calculated based on the displacement, the working condition of the carbon brush 3 is monitored, the replacement is timely carried out, the safety accident occurrence probability is reduced, and the working safety of the motor is.

While the preferred embodiments of the invention have been described, it is to be understood that the invention is not limited to the precise embodiments described, and that equipment and structures not described in detail are understood to be practiced as commonly known in the art; any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention by those skilled in the art can be made without departing from the technical scope of the present invention, and still fall within the protection scope of the technical solution of the present invention.