CN214407947U

CN214407947U - Elevator traction machine vibration measuring device based on carbon nano paper

Info

Publication number: CN214407947U
Application number: CN202120469351.2U
Authority: CN
Inventors: 杨鹏
Original assignee: Yangzhou University
Current assignee: Yangzhou University
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2021-10-15
Anticipated expiration: 2031-03-04

Abstract

The utility model discloses an elevator traction machine vibration measuring device based on carbon nano paper, which comprises a measuring bridge, a differential amplifier, a low-pass filter, a main amplifier, a microcontroller and a wireless communication module; the measuring bridge includes carbon nanometer paper, thermistor, first fixed resistance and second fixed resistance, and the carbon nanometer paper of establishing ties, thermistor and the first fixed resistance of establishing ties, second fixed resistance connect in parallel at the power both ends, and carbon nanometer paper is pasted on elevator hauler surface, and the positive negative terminal of output as measuring bridge is respectively regarded as to the electrode point between carbon nanometer paper and the thermistor, the electrode point between first fixed resistance and the second fixed resistance, the utility model discloses simple to operate improves measurement accuracy, can be used to in the elevator hauler.

Description

Elevator traction machine vibration measuring device based on carbon nano paper

Technical Field

The utility model relates to a vibration measuring device, in particular to elevator hauler vibration measuring device.

Background

Along with the rapid increase of the number of elevators, the elevator accidents are increased, and the vibration detection of the elevator traction machine plays a crucial role in preventing the elevator accidents. The vibration monitoring method of the elevator traction machine in China is to install a speed sensor on a traction wheel, a speed signal generated by the sensor is led out by a lead wire, and the lead wire is generally several meters long, complex to use, low in precision and poor in stability.

The patent with publication number CN109019218A, "a vibration state monitoring device for elevator traction machine motor", adopts methods of three-axial acceleration sensor, sensor mounting clamp, etc., and provides an irregular and on-line monitoring device. The sensor needs a clamp to be installed on a tractor motor, vibration acceleration parameters are collected irregularly, the requirement on long-term operation safety cannot be well met, and the problems of measurement accuracy, firmness and the like are caused by the adoption of clamp installation.

Therefore, there is a need for a vibration monitoring device that overcomes the above-mentioned drawbacks.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an elevator hauler vibration measuring device based on carbon nanometer paper, it is inconvenient to have solved the installation that prior art exists, and the aperiodic measurement, electromagnetic interference is serious, and the wiring difficulty, vibration signal acquire the low scheduling problem of precision.

The purpose of the utility model is realized like this: the elevator traction machine vibration measuring device based on the carbon nano paper comprises a measuring bridge with temperature self-compensation, wherein the output end of the measuring bridge is electrically connected with the input end of a differential amplifier, the output end of the differential amplifier is electrically connected with the input end of a low-pass filter, the output end of the low-pass filter is electrically connected with the input end of a main amplifier, the output end of the main amplifier is electrically connected with the input end of a microcontroller, and the output end of the microcontroller is electrically connected with a wireless communication module; the measuring bridge comprises carbon nano paper, a thermistor, a first fixed resistor and a second fixed resistor, the carbon nano paper and the thermistor which are connected in series are connected with the first fixed resistor and the second fixed resistor which are connected in series in parallel at two ends of a power supply, the carbon nano paper is adhered to the surface of the elevator traction machine, and an electrode point between the carbon nano paper and the thermistor and an electrode point between the first fixed resistor and the second fixed resistor are respectively used as output positive and negative terminals of the measuring bridge.

The utility model discloses the during operation, carbon nanopaper and thermistor connect at the adjacent bridge arm of electric bridge, according to the measuring principle of electric bridge, when temperature variation DT, cause carbon nanopaper and thermistor's change to be respectively (DR 1)_DTAnd (DR 2)_DTBy selecting the temperature coefficient of the thermistor so that (DR 1)_DT=（DR2）_DTWhen the resistance changes equally due to temperature changes, the output voltage of the bridge is not affected, temperature self-compensation is realized, measurement errors caused by temperature changes of the carbon nano paper are eliminated, and high-precision measurement is realized; the measuring bridge converts resistance signals which are difficult to directly measure into voltage signals, then the voltage signals are connected into the differential amplifier to realize preliminary amplification of the signals, the signals output by the differential amplifier are connected into a first-order low-pass filter to filter high-frequency clutter mixed in the measuring signals, the signals are converted into voltage signals which are easy to read by the microcontroller in the main amplifier, and the voltage signals are matched with a wireless communication circuit to finish acquisition, conversion and processing of vibration signals and realize wireless data transmission. Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model discloses a measurement bridge with temperature self compensating, cooperation carbon nanometer paper, thermistor make simple to operate, improve measurement accuracy. The utility model discloses can be used to in the elevator hauler.

As a further limitation of the present invention, the measuring bridge with temperature self-compensation, the adjacent bridge arms in the bridge circuit are respectively selected from carbon nanopaper with negative temperature coefficient characteristic and a thermistor with negative temperature coefficient. And the temperature self-compensation is realized by matching with the negative temperature characteristic of the carbon nano paper according to the electric bridge measurement principle.

As a further limitation of the present invention, the microcontroller selects an STM32F407 chip for use. The data acquisition circuit is arranged in the voltage acquisition circuit, so that the voltage acquisition circuit is beneficial to acquisition, conversion and processing of voltage signals.

As a further limitation of the present invention, the wireless communication module is a GPS/GPRS/5G wireless communication module. Various types of wireless transmissions may be implemented.

Drawings

Fig. 1 is a block diagram of the present invention.

Fig. 2 is a schematic diagram of the structure of the middle measuring bridge of the present invention.

Fig. 3 is a schematic diagram of a front-end circuit of the microcontroller according to the present invention.

The device comprises a measuring bridge 1, a differential amplifier 2, a low-pass filter 3, a main amplifier 4, a microcontroller 5 and a wireless communication module 6.

Detailed Description

1-3, the elevator traction machine vibration measuring device based on carbon nanopaper comprises a measuring bridge 1 with temperature self-compensation, wherein the output end of the measuring bridge 1 is electrically connected with the input end of a differential amplifier 2, the output end of the differential amplifier 2 is electrically connected with the input end of a low-pass filter 3, the output end of the low-pass filter 3 is electrically connected with the input end of a main amplifier 4, the output end of the main amplifier 4 is electrically connected with the input end of a microcontroller 5, and the output end of the microcontroller 5 is electrically connected with a wireless communication module 6; the measuring bridge 1 comprises carbon nanopaper R1 with negative temperature coefficient characteristics, a negative temperature coefficient thermistor R2, a first fixed resistor R3 and a second fixed resistor R4, the carbon nanopaper R1 and the thermistor R2 which are connected in series, the first fixed resistor R3 and the second fixed resistor R4 which are connected in series are connected in parallel at two ends of a power supply, the carbon nanopaper R1 is adhered to the surface of an elevator tractor, an electrode point between the carbon nanopaper R1 and the thermistor R2 and an electrode point between the first fixed resistor R3 and the second fixed resistor R4 are respectively used as output positive and negative terminals of the measuring bridge 1, the microcontroller 5 adopts an STM32F407 chip, and the wireless communication module 6 adopts a GPS/GPRS/5G wireless communication module 6.

The utility model discloses the during operation, carbon nanopaper R1 and thermistor R2 connect at the adjacent bridge arm of electric bridge 1, according to electric bridge 1's measurement principle, when temperature variation DT, cause carbon nanopaper R1 and thermistor R2's change to be respectively (DR 1)_DTAnd (DR 2)_DTBy selecting the temperature coefficient of the thermistor R2 (DR 1)_DT=（DR2）_DTDue to temperature changesWhen the resistance changes equally, the output voltage of the bridge 1 is not affected, so that the temperature self-compensation is realized, the measurement error caused by the temperature change of the carbon nano paper R1 is eliminated, and the high-precision measurement is realized; the measuring bridge 1 converts resistance signals which are difficult to directly measure into voltage signals, then the voltage signals are connected into the differential amplifier 2 to realize the preliminary amplification of the signals, the signals output by the differential amplifier 2 are connected into the first-order low-pass filter 3 to filter high-frequency clutter mixed in the measuring signals, the signals are converted into voltage signals which are easy to read by the microcontroller 5 in the main amplifier 4, and the acquisition, conversion and processing of vibration signals are completed by matching with a wireless communication circuit, and the wireless transmission of data is realized.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and transformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and transformations are all within the protection scope of the present invention.

Claims

1. The elevator traction machine vibration measuring device based on the carbon nano paper is characterized by comprising a measuring bridge with temperature self-compensation, wherein the output end of the measuring bridge is electrically connected with the input end of a differential amplifier, the output end of the differential amplifier is electrically connected with the input end of a low-pass filter, the output end of the low-pass filter is electrically connected with the input end of a main amplifier, the output end of the main amplifier is electrically connected with the input end of a microcontroller, and the output end of the microcontroller is electrically connected with a wireless communication module; the measuring bridge comprises carbon nano paper, a thermistor, a first fixed resistor and a second fixed resistor, the carbon nano paper and the thermistor which are connected in series are connected with the first fixed resistor and the second fixed resistor which are connected in series in parallel at two ends of a power supply, the carbon nano paper is adhered to the surface of the elevator traction machine, and an electrode point between the carbon nano paper and the thermistor and an electrode point between the first fixed resistor and the second fixed resistor are respectively used as output positive and negative terminals of the measuring bridge.

2. The carbon nanopaper-based vibration measuring apparatus for an elevator traction machine as defined in claim 1, wherein the measuring bridge having a self-temperature compensation function is a bridge in which adjacent arms are carbon nanopaper having a negative temperature coefficient characteristic and a thermistor having a negative temperature coefficient, respectively.

3. The carbon nanopaper-based elevator traction machine vibration measurement apparatus according to claim 1 or 2, wherein the microcontroller selects an STM32F407 chip.

4. The carbon nanopaper-based elevator traction machine vibration measurement device according to claim 1 or 2, wherein the wireless communication module is a GPS/GPRS/5G wireless communication module.