CN111677846A - Mining scraper conveyor reduction gear lubricating oil quality monitoring sensor - Google Patents
Mining scraper conveyor reduction gear lubricating oil quality monitoring sensor Download PDFInfo
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- CN111677846A CN111677846A CN202010070718.3A CN202010070718A CN111677846A CN 111677846 A CN111677846 A CN 111677846A CN 202010070718 A CN202010070718 A CN 202010070718A CN 111677846 A CN111677846 A CN 111677846A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0405—Monitoring quality of lubricant or hydraulic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N2250/00—Measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N2250/00—Measuring
- F16N2250/08—Temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention provides a lubricating oil quality monitoring sensor for a mining scraper conveyor reducer, which consists of a main circuit board, a display unit, a keyboard, a measuring electrode, a temperature sensor and a fan; the measuring device comprises a sensor, a main circuit board, a display unit, a keyboard, a measuring electrode and a measuring electrode, wherein the sensor is based on a polytetrafluoroethylene shell, the main circuit board is arranged in the shell, the display unit and the keyboard are both arranged on the shell, and one section of the measuring electrode is fixed on the sensor polytetrafluoroethylene shell; the probe of the temperature sensor is arranged in the lubricating oil, and the outgoing line of the temperature sensor is connected with the analog quantity acquisition channel of the CPU; the fan is placed in the lubricating oil. The lubricating oil quality sensor is composed of a CPU, a communication unit, a motor driving unit, an analog quantity conditioning unit, a relay, a sinusoidal signal generator, a display unit, a keyboard, a measuring electrode, a temperature sensor and a fan, the lubricating oil quality sensor is used for measuring the lubricating oil quality of the mining scraper conveyor speed reducer, the current state of the lubricating oil is evaluated, and the automatic level of the lubricating oil quality detection of the scraper conveyor speed reducer is improved.
Description
Technical Field
The invention relates to a lubricating oil quality monitoring sensor for a scraper conveyor speed reducer, which is particularly suitable for online monitoring of lubricating oil quality of the scraper conveyor speed reducer on a fully mechanized mining face in a coal mine.
Background
The scraper conveyor is the only coal conveying equipment of the underground fully mechanized coal mining face of the coal mine, and the safety and the reliability of the scraper conveyor are the key points of coal mining. The speed reducer is the core equipment of the scraper conveyor and mainly used for improving output torque, reducing rotating speed and connecting the motor with the scraper chain. The gears and bearings of the reducer are subjected to a large moment of action from the motor and a reaction moment when the bearings transmit power during operation. Therefore, in order to protect the gears from being damaged under the work of high-strength load, the gear box of the speed reducer is provided with a lubricating oil tank, the gears are well lubricated by the lubricating oil, and meanwhile the lubricating oil is driven by the rotation of the gears to dissipate heat of the gears, so that the good and reliable lubricating oil is used for guaranteeing the normal operation of the speed reducer.
At present, the analysis of the quality of the lubricating oil of the mining scraper conveyor still needs a professional technician to regularly perform time-based monitoring, namely: peep the inspection in the reduction gear at regular time, then gather reduction gear lubricating oil sample, send into the laboratory and carry out the analysis, whole process working cycle is long, and work load is big, and work efficiency is low, and needs to shut down the scraper conveyor long time, has reduced scraper conveyor's utilization ratio, has influenced the coal mining efficiency of working face.
The lubricating oil for the scraper conveyor speed reducer is in a relatively static state, and the designed sensor needs to be capable of ensuring that the lubricating oil measured between the two electrode plates of the sensor probe is consistent with the oil in the oil tank, so that the deterioration process of the lubricating oil can be accurately reflected in real time, and the online monitoring of the deterioration process of the lubricating oil can be realized.
Some documents report researches on lubricating oil monitoring sensors, for example, a hardware system for micro-capacitance detection is introduced in a 'novel online oil monitoring sensor based on dielectric constant' published by shijianwei and the like of national defense science and technology university, and an oil online monitoring experimental system is developed on the basis of the hardware system, but the design of the sensor is not specifically explained; a capacitive sensor based on AD7745 digital capacitance conversion is introduced in an article of 'capacitive oil sensor design based on dielectric constant' published by Hanting et al, Nanjing university of science and engineering, and the AD7745 has the defects of small measurement range and need of increasing a capacity expansion circuit, otherwise, the measurement requirement in the lubricating oil quality measurement process of the mining scraper conveyor reducer cannot be met.
The prior patent with publication number CN102621195A 'a novel sensor for online monitoring of iron content and a monitoring method thereof' provides a sensor for measuring the iron content of lubricating oil based on capacitance to monitor the iron content of the lubricating oil, but in the running process of a speed reducer, a plurality of factors influencing the oil quality of the lubricating oil exist, and only one problem that the deterioration of the lubricating oil cannot be reflected is monitored. The patent with publication number CN204044101U, "a capacitive sensor with automatic compensation function for on-line monitoring of lubricant quality", provides a sensor for measuring the quality of oil based on the change of oil dielectric constant combined with temperature compensation, and the patent details the design structure of the sensor probe, the mentioned sensor probe is suitable for the fluid oil environment, the lubricant oil for the reducer of the scraper conveyor is in a relatively static state, the sensor can not be used for monitoring the quality of lubricant oil in the oil tank of the reducer of the scraper conveyor, and the patent does not give the conversion relation between the capacitance value and the relative dielectric constant of the oil and the relation between the relative dielectric constant and the quality of the lubricant oil.
Disclosure of Invention
In order to solve the defects and shortcomings in the process of monitoring, checking and maintaining the lubricating oil state of the speed reducer in the background technology, the invention aims to: the quality monitoring sensor for the lubricating oil of the mining scraper conveyor speed reducer monitors the change of the quality of the lubricating oil of the mining scraper conveyor speed reducer on line, abandons the traditional maintenance plan based on time, adopts a maintenance plan based on state instead, further improves the working efficiency, reduces unnecessary complex work, and improves the operational reliability of the mining scraper conveyor speed reducer on a fully mechanized mining face of a coal mine.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a mining scraper conveyor reduction gear lubricating oil quality control sensor which characterized in that: the sensor consists of a main circuit board, a display unit, a keyboard, a measuring electrode, a temperature sensor and a fan; the measuring device comprises a sensor, a main circuit board, a display unit, a keyboard, a measuring electrode and a measuring electrode, wherein the sensor is based on a polytetrafluoroethylene shell, the main circuit board is arranged in the shell, the display unit and the keyboard are both arranged on the shell, and one section of the measuring electrode is fixed on the sensor polytetrafluoroethylene shell; the probe of the temperature sensor is arranged in the lubricating oil, and the outgoing line of the temperature sensor is connected with the analog quantity acquisition channel of the CPU; the fan is placed in the lubricating oil.
The main circuit board is arranged in a polytetrafluoroethylene shell of the sensor and consists of a CPU, a communication unit, a motor driving unit, an analog quantity conditioning unit, a relay and a sine signal generator. The CPU is used for calculating the relative dielectric constant and temperature of the lubricating oil, switching the measuring electrodes, calibrating the relative dielectric constant of the lubricating oil during initial use, judging the current quality of the lubricating oil, outputting measuring data and controlling the frequency of a sinusoidal signal. The communication unit is connected with a USART interface of the CPU, and the communication unit consists of 1 path of RS-485 interfaces and is used for transmitting the collected data to the outside. The motor driving unit is connected with the CPU in an SPI mode and used for controlling the motor to drive the fan to rotate. The analog quantity conditioning circuit is connected with the CPU through an analog quantity acquisition channel and is used for converting the relative dielectric constant of the lubricating oil into a standard analog quantity signal. The relay is connected with the I/O of the CPU and used for selectively connecting a stainless steel inner electrode of the analog quantity conditioning circuit. The sine signal generator is connected with the CPU through an I/O port and is used for sending out adjustable sine signals with the output amplitude of 1V and the frequency of 10Hz to 1 kHz.
The CPU is an 8051F040 type singlechip.
The display unit adopts a 1.8-inch TFT liquid crystal screen, is arranged on a polytetrafluoroethylene shell of the sensor, is connected with a USART interface of the CPU and is used for displaying the dielectric constant value, the quality state and the parameter set value of the lubricating oil obtained by testing.
The keyboard is a 4 x 4 key, is arranged on a polytetrafluoroethylene shell of the sensor, is connected with a general I/O port of the CPU, and is used for setting parameter input and screen page turning control.
The measuring electrode is arranged in lubricating oil, and one end of the measuring electrode is fixed on a polytetrafluoroethylene shell of the sensor. The measuring electrode comprises an oil through hole, a stainless steel outer electrode, a stainless steel inner electrode I, a stainless steel inner electrode II, a stainless steel inner electrode III, a polytetrafluoroethylene annular bracket, an electrode lead and a positioning pin; wherein the oil through hole provides a passage for the lubricating oil to flow between the electrodes; the stainless steel outer electrode and the stainless steel inner electrode are respectively connected with one end of one electrode lead, the other end of each electrode lead penetrates through a polytetrafluoroethylene shell of the sensor through a sealing sleeve to be connected with the analog quantity conditioning circuit, and the sealing sleeve is used for preventing lubricating oil from leaking; the positioning pin is used for fixing the stainless steel electrode on the polytetrafluoroethylene annular bracket.
The probe of the temperature sensor is arranged in the lubricating oil, and the outgoing line of the temperature sensor is connected with the analog quantity acquisition channel of the CPU and used for measuring the temperature of the lubricating oil and correcting the dielectric constant measurement deviation caused by temperature change.
The fan is arranged in the lubricating oil and comprises a motor and blades, and the motor is arranged in the polyethylene shell and is connected with the motor driving unit of the main circuit board; the blade is arranged in the lubricating oil and is connected with a rotating shaft of the motor; the fan is used for enabling lubricating oil to flow between the measuring electrodes, and the lubricating oil between the measuring electrodes is guaranteed to be consistent with oil in the oil tank of the speed reducer.
The analog quantity conditioning circuit of the main circuit board consists of a bridge circuit, a phase control circuit and an alternating-current-direct-current signal conversion circuit; the bridge circuit is connected with the phase control circuit; the other ends of the bridge circuit and the phase control circuit are connected with an AC-DC signal conversion circuit.
The bridge circuit consists of a main measuring circuit and a reference capacitance measuring circuit, wherein the main measuring circuit consists of a phase compensation circuit, a measuring electrode, an operational amplifier, a feedback capacitor and a high-pass filter F1The input end of the phase compensation circuit is connected with the input end of the reference capacitance measuring circuit, the output end of the phase compensation circuit is connected with one end of the measuring electrode, the other end of the measuring electrode is connected with the input end of the operational amplifier and one end of the feedback capacitor, and the output end of the operational amplifier and the other end of the feedback capacitor are connected with the high-pass filter F1The input ends of the two-way valve are connected; output end of reference capacitance measuring circuit and high-pass filter F2Is connected to the input terminal of the controller.
The phase control circuit is used for controlling the size of a compensation capacitor in the phase compensation circuit and comprises a square wave generator, a phase discriminator, a differential amplifier and an integrating circuit, wherein the square wave generator U1And U2Input terminal of and high-pass filter F of the bridge circuit1And F2Is connected with the output end of a square wave generator U1And U2The output end of the phase discriminator is connected with the input end of the phase discriminator, the output end of the phase discriminator is connected with the input end of the differential amplifier, the output end of the differential amplifier is connected with the input end of the integrating circuit, and the output end of the integrating circuit is connected with the input end of the phase compensation circuit of the bridge circuit.
The AC-DC signal conversion circuit is used for differentiating two voltage signals obtained by testing the bridge circuit and converting the two voltage signals into DC signals through the rectification and low-pass filter circuit for output, and comprises a differential amplifier and a rectification low-pass filter circuit, wherein the input ends of the differential amplifier are respectively arranged at a high-pass filter F1And F2The output end of the differential amplifier is connected with the input end of the rectification low-pass filter circuit, and the output end of the rectification low-pass filter circuit is connected with the CPU analog quantity acquisition channel.
The specific implementation process of the invention is as follows: the bottom of the scraper conveyor speed reducer is provided with a lubricating oil product monitoring sensor, a measuring electrode formed by measuring a stainless steel outer electrode and an inner electrode is used for measuring the capacitance of the lubricating oil between the two electrodes through an analog quantity conditioning circuit, the capacitance value is converted into a standard analog quantity signal and transmitted to a CPU, the CPU selects the used inner electrode in real time according to the measured signal, and the quality of the lubricating oil, namely the relative dielectric constant, is calculated by the CPU. The CPU measures the temperature of the lubricating oil and corrects the measured relative dielectric constant value of the lubricating oil. Before the lubricating oil product monitoring sensor is used each time, the relative dielectric constant of new lubricating oil is measured, then the change process of the lubricating oil is measured in real time, and the state of the current lubricating oil is evaluated by combining the relative dielectric constant when the lubricating oil reaches the scrapped state. And displaying the measurement result and the evaluation state through the display unit, and transmitting the measurement result and the evaluation state to the scraper conveyor monitoring and protecting system through the CPU.
The method for evaluating the lubricating oil quality of the scraper conveyor reducer comprises the following steps: relative dielectric constant of new oil according to lubricating oil0To scrap relative dielectric constantsThe change of (2) firstly divides the deterioration process of the lubricating oil into: novel oil0～1Is good in1～2It is better2～3In general, in3～4Poor quality4～5Near end of life5～6And is scrapped6～sThere are 7 stages in total. Then, the relative dielectric constant of the lubricating oil is judged at the stage, and the current lubricating oil with the quality of new oil, good, better, common, worse, near scrapping or scrapping can be obtained.
The invention has the beneficial effects that: the lubricating oil quality sensor is composed of a CPU, a communication unit, a motor driving unit, an analog quantity conditioning unit, a relay, a sinusoidal signal generator, a display unit, a keyboard, a measuring electrode, a temperature sensor and a fan, the lubricating oil quality sensor is used for measuring the lubricating oil quality of the mining scraper conveyor speed reducer, the current state of the lubricating oil is evaluated, and the automatic level of the lubricating oil quality detection of the scraper conveyor speed reducer is improved.
Drawings
FIG. 1 is a block diagram of a patented sensor of the invention;
FIG. 2 is a block diagram of the sensor of the present invention;
FIG. 3 is a schematic diagram of an analog conditioning circuit of the sensor of the present invention;
in the figure: 1. a sensor polytetrafluoroethylene housing; 2. sealing sleeves; 3. positioning pins; 4. a stainless steel outer electrode; 5. a stainless steel inner electrode I; 6. a stainless steel inner electrode II; 7. a polytetrafluoroethylene annular bracket I; 8. a stainless steel inner electrode III; 9. a polytetrafluoroethylene annular bracket II; 10. a stainless steel inner electrode III lead; 11. a stainless steel inner electrode II lead; 12. a stainless steel inner electrode I lead; 13. a stainless steel outer electrode lead; 14. a blade; 15. a motor; 16. a main circuit board; 17. a display unit; 18. a temperature sensor; 19. a keyboard; 20. an oil through hole.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 and 2, the lubricating oil monitoring sensor for the mining scraper conveyor speed reducer provided by the invention is designed for realizing online monitoring of the lubricating oil state of the mining scraper conveyor speed reducer on the basis of the prior art, and mainly comprises the following structural components: the main circuit board 16, the display unit 17, the keyboard 19, the measuring electrode, the temperature sensor 18 and the fan are all arranged on the polytetrafluoroethylene shell 1 of the sensor, and the shell is provided with M30 multiplied by 1.5 standard threads which can be directly arranged on the speed reducer. The main circuit board 16 is arranged in the sensor polytetrafluoroethylene shell 1 and comprises a CPU, a communication unit, a motor driving unit, an analog quantity conditioning circuit, a relay and a sinusoidal signal generator; wherein the communication unit is connected with the USART interface of the CPU, the motor driving unit is connected with the CPU in an SPI mode, the analog quantity conditioning circuit is connected with the CPU through an analog quantity acquisition channel, the relay is connected with the I/O of the CPU, and the sinusoidal signal generator is connected with the CPU through an I/O port. The keyboard 19 is a 4 x 4 key, is arranged on the polytetrafluoroethylene shell 1 of the sensor, is connected with a general I/O port of the CPU and is used for inputting setting parameters and controlling screen page turning; the probe of the temperature sensor 18 is arranged in the lubricating oil, and the outgoing line of the temperature sensor 18 is connected with the analog quantity acquisition channel of the CPU and used for measuring the temperature of the lubricating oil and correcting the dielectric constant measurement deviation caused by temperature change. The fan comprises a motor 15 and blades 14, the motor 15 is arranged in the polyethylene shell 1 and is connected with a motor driving unit of the main circuit board 16; the blade 14 is arranged in lubricating oil and is connected with a rotating shaft of a motor 15; the fan is used for enabling lubricating oil to flow between the measuring electrodes, and the lubricating oil between the measuring electrodes is guaranteed to be consistent with oil in the oil tank of the speed reducer.
As shown in fig. 3, the analog conditioning circuit is composed of a bridge circuit, a phase control circuit, and an ac-dc signal conversion circuit. The bridge circuit is composed of a main measuring circuit and a reference capacitance measuring circuit. The main measuring circuit consists of a phase compensation circuit, a measuring electrode, an operational amplifier, a feedback capacitor and a high-pass filter. In the analog quantity conditioning circuit, the measuring electrode is equivalent to Cs. The phase compensation circuit is used for compensating the inductive influence on the capacitive connection line of the sensor probe and is formed by an operational amplifier Q1Resistance R1Resistance R2And voltage-controlled resistor UR1Comprising a phase compensation circuit input and a sine signal generator output VinThe output end is connected with an equivalent capacitor CsOne end of the tube. Equivalent capacitance CsThe other terminal and an operational amplifier Q2Is connected to the negative input of the feedback capacitor Cf1Is connected to an operational amplifier Q2Output and negative input of, an operational amplifier Q2Is grounded, and an operational amplifier Q2And the output end of the high-pass filter F1Is connected to the input of a high-pass filter F1Output terminal of and differential amplifier Q4Is connected to the positive input of; the reference capacitance measuring circuit is composed of a reference capacitance CrefOperational amplifier Q3A feedback capacitor Cf2And a high-pass filter F2And (4) forming. Reference capacitance CrefAnd a sine signal generator output VinTerminal connected, reference capacitor CrefAnd the other end of (1) and an operational amplifier Q3Reverse terminal connected to feedback capacitor Cf2Is connected to an operational amplifier Q3Output and negative input of, an operational amplifier Q3Output terminal and high-pass filter F2Is connected to the input of a high-pass filter F2Output terminal of and differential amplifier Q4Is connected.
The phase control circuit is used for controlling the size of a compensation capacitor in the phase compensation circuit and is composed of a square wave generator U1And U2Phase discriminator U3Differential amplifier Q5And an integration circuit. Wherein the square-wave generator outputs the output voltages V of the main and reference measuring circuitssAnd converting the voltage into square waves for phase discrimination, and obtaining the phase difference between the two output voltages of the main measuring circuit and the reference measuring circuit through the phase discriminator. Square wave generator U1The input end is connected with a high-pass filter F1V ofsOutput terminal, square wave generator U2The input end is connected with a high-pass filter F2V ofrefOutput terminal, square wave generator U1And U2The output end is connected with a phase discriminator U3Input terminal, phase discriminator U3The output end is connected with a differential amplifier Q5To the input terminal of (1). Integrating circuit Q5And C1Composition, differential amplifier Q5Q of output terminal and integrating circuit6Input terminal and C1Is connected to one end of an integrating circuit6Output terminal and C1Another end of (1) and UR1And the control end is connected.
The AC-DC signal conversion circuit differentiates two voltage signals obtained by testing the bridge circuit, and the two voltage signals pass through a rectification and low-pass filter circuit F3Converting it into DC signal and outputting. Which is composed of a differential amplifier Q4Rectifying low-pass filter circuit F3And (4) forming. Rectification low-pass filter circuit F3A single-phase full-wave rectifying circuit and a low-pass filter circuit. The inputs of the differential amplifier are connected to a high-pass filter F1And F2V ofsAnd VrefThe output end of the differential amplifier is connected with a low-pass filter circuit F3Input terminal of (1), low-pass filter circuit F3Output end VdIs connected with the analog input port of the CPU.
As shown in figure 3, the measuring electrode is placed in the lubricating oil, and one end of the measuring electrode is fixed on the polytetrafluoroethylene shell of the sensor. The measuring electrode includes: oil through hole 20, stainless steel outer electrode 4, stainless steel inner electrode I5, stainless steel inner electrode II6, stainless steel inner electrode III8 and polytetrafluoroethyleneThe device comprises an annular bracket 7, a stainless steel outer electrode lead 13, a stainless steel inner electrode I lead 12, a stainless steel inner electrode II lead 11, a stainless steel inner electrode III lead 10 and a positioning pin 3; the oil through hole 20 provides a channel for lubricating oil to flow between the electrodes, the stainless steel outer electrode lead 13, the stainless steel inner electrode I lead 12, the stainless steel inner electrode II lead 11 and the stainless steel inner electrode III lead 10 are all plated with silver wires, the stainless steel outer electrode 4, the stainless steel inner electrode I5, the stainless steel inner electrode II6 and the stainless steel inner electrode III8 are respectively connected with one end of the stainless steel outer electrode lead 13, the stainless steel inner electrode I lead 12, the stainless steel inner electrode II lead 11 and the stainless steel inner electrode III lead 10, the other end of each electrode lead penetrates through the sensor polytetrafluoroethylene shell 1 through the sealing sleeve 2 to be connected with the analog quantity conditioning circuit, and the sealing sleeve 2 is used for preventing the lubricating oil from leaking. The positioning pin 3 is used for fixing the stainless steel outer electrode 4 on the polytetrafluoroethylene outer shell 1, fixing the stainless steel inner electrode 5 on the polytetrafluoroethylene outer shell 1 and the polytetrafluoroethylene annular support II9, fixing the stainless steel inner electrode 6 on the polytetrafluoroethylene annular support II9 and the polytetrafluoroethylene annular support I7, and fixing the stainless steel inner electrode 8 on the polytetrafluoroethylene annular support I7. The stainless steel outer electrode 4, the stainless steel inner electrode I5, the stainless steel inner electrode II6 and the stainless steel inner electrode III8 are all stainless steel tubes with the thickness d; the inner radius of the stainless steel outer electrode 4 is R2The outer radiuses of the stainless steel inner electrode I5, the stainless steel inner electrode II6 and the stainless steel inner electrode III8 are R respectively11>R12>R13. In actual measurement, only one stainless steel inner electrode is connected into an analog quantity conditioning circuit, so that the outer radius of the electrode is recorded as R in calculation1Obtaining the equivalent capacitance C between the sensor electrodessThe following relationship is satisfied with the electrode size:
in the formula: r1Is the outer radius of the inner electrode, R2The inner radius of the outer electrode.
It can be seen that when the length L of the measuring electrode of the sensor is constant, the outer radius R of the inner electrode is constant1And an external electrodeInner radius R of2The smaller the difference between, the higher the sensitivity of the sensor. However, when the measurement value is too large or too small, it may exceed the measurement range of the analog conditioning circuit. Therefore, the present invention designs three sizes of inner electrodes. In the measuring process, the inner electrode is switched according to the change of the relative dielectric constant when the quality of the lubricating oil changes, so that the measuring result is kept in the measuring range of the analog quantity conditioning circuit. According to the designed analog quantity conditioning circuit, when the lubricating oil is new oil, a stainless steel inner electrode I5 and a stainless steel outer electrode 4 are selected for measurement; when the relative dielectric constant of the lubricating oil reaches1When in use, a stainless steel inner electrode II6 and a stainless steel outer electrode 4 are selected for measurement; when the relative dielectric constant of the lubricating oil reaches2When the measurement is carried out, the stainless steel inner electrode III8 and the stainless steel outer electrode 4 are selected for measurement.
The sensor measurement principle is as follows: input sine wave VinIn the main measuring circuit, the equivalent capacitance C between the compensation circuit and the sensor electrodesOperational amplifier Q2And a compensation capacitor Cf1And a high-pass filter F1Obtaining a phase-advanced sine wave VsInput sine wave VinIn the reference measuring circuit, by means of a reference capacitor CrefOperational amplifier Q3And a compensation capacitor Cf2And a high-pass filter F2Obtaining a phase-advanced sine wave VrefV to be obtainedsAnd VrefThrough Q4Difference to obtain VoutWill VoutAfter rectification and filtering, the direct current signal V is finally obtaineddWherein the conversion relation is as formulas (2) to (6):
Vin＝Asin(ωt) (2)
converting the characteristics of the differential amplifier circuit to obtain a voltage difference value VoutThe relation between the capacitance and the capacitance to be measuredThe formula is as follows:
deriving V from the conversion relationship of the rectifier circuitdThe relationship with the capacitance value of the sensor is as follows
In the formula: a is the amplitude of the input sinusoidal signal, and omega is the frequency; g is a differential amplifier Q4S is the sensitivity of the measurement circuit, and Δ C is the capacitance between the reference capacitance and the probe of the sensor to be measured.
Since the obtained delta C is a difference value, the sizes of the reference capacitor and the capacitor to be detected cannot be accurately judged, and therefore the voltage V is judged through a phase discriminator in a phase control loopsAnd VrefObtaining the value between the capacitance value of the sensor probe to be measured immersed in the lubricating oil and the reference capacitance, and calculating to obtain VdAnd CsThe functional relationship between the two is as follows:
with reference to equation 1, the relative dielectric constant of the lubricating oil can be derived as follows:
as the quality of the lubricating oil deteriorates, the relative dielectric constant value of the lubricating oil gradually increases. Because the lubricating oil for the scraper conveyor speed reducer is the lubricating oil for the L-CKD closed gearbox, according to the regulations of NB/SH/T0586-2010 on the lubricating oil for the L-CKD closed gearbox, when the relative dielectric constant of the lubricating oil is changed intosIn time, the lubricating oil is scrapped and needs to be replaced in time. Since the oil discard is not a direct change from new oil to discard, but a process is required, the oil deterioration process is evaluated according to the oil changeRelative dielectric constant of new oil0To scrap relative dielectric constantsThe modification of the lubricating oil comprises the following steps: novel oil0～1Is good in1～2It is better2～3In general, in3～4Poor quality4～5Near end of life5～6And is scrapped6～s7 stages.
Claims (4)
1. The utility model provides a mining scraper conveyor reduction gear lubricating oil quality monitoring sensor which characterized in that: the sensor structure includes: the device comprises a main circuit board, a display unit, a keyboard, a measuring electrode, a temperature sensor and a fan; the measuring device comprises a sensor, a main circuit board, a display unit, a keyboard, a measuring electrode and a measuring electrode, wherein the sensor is based on a polytetrafluoroethylene shell, the main circuit board is arranged in the shell, the display unit and the keyboard are both arranged on the shell, and one section of the measuring electrode is fixed on the sensor polytetrafluoroethylene shell; the probe of the temperature sensor is arranged in the lubricating oil, and the outgoing line of the temperature sensor is connected with the analog quantity acquisition channel of the CPU;
the main circuit board is arranged in a polytetrafluoroethylene shell of the sensor and comprises a CPU, a communication unit, a motor driving unit, an analog quantity conditioning circuit, a relay and a sinusoidal signal generator; the communication unit is connected with a USART interface of the CPU, the motor driving unit is connected with the CPU in an SPI mode, the analog quantity conditioning circuit is connected with the CPU through an analog quantity acquisition channel, the relay is connected with the I/O of the CPU, and the sinusoidal signal generator is connected with the CPU through an I/O port;
the display unit adopts a 1.8-inch TFT liquid crystal screen, is arranged on a polytetrafluoroethylene shell of the sensor and is connected with a USART interface of the CPU;
the keyboard is a 4 x 4 key, is arranged on the polytetrafluoroethylene shell of the sensor and is connected with a general I/O port of the CPU;
the measuring electrode is arranged in lubricating oil, and one end of the measuring electrode is fixed on a polytetrafluoroethylene shell of the sensor; the measuring electrode comprises an oil through hole, a stainless steel outer electrode, stainless steel inner electrodes I, II and III, a polytetrafluoroethylene annular bracket, an electrode lead and a positioning pin; the stainless steel outer electrode and the stainless steel inner electrode are respectively connected with one end of an electrode lead, the other end of each electrode lead penetrates through a sensor polytetrafluoroethylene shell through a sealing sleeve to be connected with an analog quantity conditioning circuit, and the positioning pin is used for fixing the stainless steel electrode on a polytetrafluoroethylene annular bracket;
the fan structure comprises a motor and blades, wherein the motor is arranged in the polyethylene shell and is connected with the motor driving unit of the main circuit board; the blade is arranged in the lubricating oil and is connected with a rotating shaft of the motor.
2. The mining scraper conveyor speed reducer lubricating oil quality monitoring sensor of claim 1, characterized in that: the CPU is an 8051F040 type singlechip.
3. The mining scraper conveyor speed reducer lubricating oil quality monitoring sensor of claim 1, characterized in that: the communication unit consists of 1 path of RS-485 interfaces.
4. The mining scraper conveyor speed reducer lubricating oil quality monitoring sensor of claim 1, characterized in that: the analog quantity conditioning circuit of the main circuit board consists of a bridge circuit, a phase control circuit and an alternating-current-direct-current signal conversion circuit; the bridge circuit is connected with the phase control circuit; the other ends of the bridge circuit and the phase control circuit are connected with an AC-DC signal conversion circuit.
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Cited By (1)
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| CN113358554A (en) * | 2021-05-24 | 2021-09-07 | 浙江环动机器人关节科技有限公司 | Lubricating grease and lubricating oil product test device and test method |
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