CN112729388A - Digital three-parameter safety monitoring probe - Google Patents
Digital three-parameter safety monitoring probe Download PDFInfo
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- CN112729388A CN112729388A CN202011528328.2A CN202011528328A CN112729388A CN 112729388 A CN112729388 A CN 112729388A CN 202011528328 A CN202011528328 A CN 202011528328A CN 112729388 A CN112729388 A CN 112729388A
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- 239000000523 sample Substances 0.000 title claims abstract description 35
- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 230000001133 acceleration Effects 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000012208 gear oil Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 102220414581 c.33A>G Human genes 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 102220015875 rs6734111 Human genes 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The invention discloses a digital three-parameter safety monitoring probe, which belongs to the technical field of mechanical monitoring and comprises a probe rod, a lower cover, a circuit board, a shell, an upper cover, a plate electrode, a temperature sensor, an oil level electrode and a vibration sensor, wherein the probe rod comprises a probe rod body, a lower cover, a circuit board, a shell body, an upper cover, a plate electrode, a temperature sensor, an oil level: the cable testing device comprises a lower cover, a shell and an upper cover, wherein the upper cover is integrated into a whole and is provided with a cable leading-out hole, and a probe rod extends out of the lower cover; the temperature sensor and the oil level electrode are arranged on the electrode plate; the temperature sensor is PT 100; the probe rod is a circular tube with an opening at the lower end, and the electrode plate is arranged in the probe rod; the vibration sensor adopts a piezoelectric acceleration chip ADXL345 and is arranged on the circuit board; the circuit board comprises a temperature signal circuit, a liquid level signal circuit and a vibration signal circuit; high accuracy, high real-time and high sensitivity adopt digital electronic technology, and several equipment can adopt a data line output, have saved material cost, and the measurement accuracy improves, and the fault rate is low moreover, also reduces enterprise spare parts cost.
Description
Technical Field
The invention belongs to the technical field of mechanical monitoring, and particularly relates to a digital three-parameter safety monitoring probe.
Background
In the occasion of real-time monitoring of parameters such as oil temperature, oil level, vibration and the like, an integrated three-parameter combined probe is needed to be used for acquiring signal parameters, wherein a magnetoelectric vibrator vibration core of a magnetoelectric mechanical structure is generally adopted for acquiring vibration signals. And the resistance wire that the oil level was measured and is adopted measures the oil level, because the resistance wire is thinner, easy fracture, including service environment is more abominable, soaks in speed reducer gear oil for a long time, and the resistance wire corrodes easily and leads to the oil level to measure inaccurate, and then arouses monitoring device to report to the police, thereby shuts down even and influences production.
In addition, because the background technology collects analog quantity, the precision is not high, such as the error range of temperature is +/-1 ℃, the error range of oil level is +/-5 mm, the error range of vibration is +/-1 mm/s, the anti-interference capability is weak, the real-time performance is slow, and the sensitivity is low.
Disclosure of Invention
The invention aims to provide a digital three-parameter safety monitoring probe to solve the problems in the technical background.
The invention is realized by the following technical scheme:
the utility model provides a digital three parameter safety monitoring probe, includes probe rod, lower cover, circuit board, casing, upper cover, plate electrode, temperature sensor, oil level electrode, vibration sensor:
the lower cover, the shell and the upper cover form a whole, a cable leading-out hole is formed in the upper cover, and the probe rod extends out of the lower cover;
the temperature sensor and the oil level electrode are arranged on the electrode plate;
the temperature sensor is PT 100;
the probe rod is a circular tube with an open lower end, and the electrode plate is arranged in the probe rod;
the vibration sensor adopts a piezoelectric acceleration chip ADXL345 and is arranged on the circuit board;
the circuit board comprises a temperature signal circuit, a liquid level signal circuit and a vibration signal circuit;
preferably, the temperature signal processing circuit comprises resistors R29, R30, R31, R32, R33, R34, R39, an operational amplifier OP07 and a voltage regulator tube D3;
the R29, R30, R34 and PT100 temperature sensors form a Venturi bridge, and a bridge circuit is amplified by an operational amplifier OP07 and then output;
further, R29 ═ R30 ═ R32 ═ R33 ═ 1K, R34 ═ 100, R31 ═ R39 ═ 100K;
further, in order to protect the STM32 chip from being burnt out due to overlarge input voltage, a 3.3V voltage stabilizing diode D3 is added at the output end of the conditioning circuit;
the resistance measurement principle is that, according to the design of the circuit, the relationship between the output voltage Vout1 and Pt100 is,
Vout1＝3.3(10000-RPT100)/(1000+RPT100)/11。
the liquid level signal circuit comprises resistors R1 and R2, a capacitor C2, a time-base integrated chip NE 555: the resistors R1 and R2, the capacitor C2, the time-base integrated chip NE555 and the capacitor to be tested form a multi-harmonic oscillation circuit;
the principle of capacitance measurement is that the capacitance values of two electrodes in air and gear oil of a speed reducer are different by applying the principle that the dielectric constants of different media are different. NE555 is adopted to collect the corresponding capacitance value between the two electrodes, and the size of the measured capacitance is calculated by calculating the frequency. The method comprises the following specific steps:
after the power is turned on, the power source Uo charges the side capacitor C1 through R1 and R2. When Uc <1/3Uo, the oscillator output 1 and the discharge tube are off. When Uc charges to 2/3Uo or more, the oscillator output flips to 0. At this time, the discharge tube is turned on, the discharge end is grounded, and the capacitor C1 is discharged to ground through R2, lowering Uc. When Uc drops to 1/3Uo or less, the oscillator output is turned to 1 again. At this time, the discharge tube is cut off again, the discharge end is not grounded, the power supply UO charges the capacitor C1 again through R1 and R2, the Uc rises to 2/3UO from 1/3UO, and the trigger is turned over again. This is repeated in cycles so as to obtain a continuously varying oscillating pulse waveform at the output.
The pulse width TL is ln2R2C1, which is determined by the discharge time of the capacitor C1;
TH-ln 2(R1+ R2) C1 is determined by the charging time of the capacitor C1, and the pulse period T is TH + TL.
T＝TH+TL＝ln2(R1+R2)C1+ln2R2C1。
Setting R1 ═ 1K Ω, R2 ═ 750K Ω, making R1+ R2 ≈ R2 yields f ═ 1/T ═ 1/2ln2R2C1
I.e. C1 ═ 1/2ln2R2f
The vibration signal circuit comprises an RT9161 power supply chip, capacitors C3, C4, C5, C6, resistors R11, R12, R13, R14 and R15;
the RT9161 power supply chip, the capacitors C3, C4, C5 and C6 form a 3.3v voltage-stabilized power supply which supplies power to the acceleration chip ADXL 345;
further, a 0 ohm resistor is connected between the pin 6 of the acceleration chip ADXL345 and a power supply;
a pull-up resistor of 10k is connected between the pin 7, the pin 13 and the pin 14 and a power supply;
preferably, C3 ═ C5 ═ 10uF, C4 ═ C6 ═ 0.1uF, R11 ═ R14 ═ 0, and R12 ═ R13 ═ R15 ═ 10K.
The invention has the following beneficial effects:
the three-parameter monitoring probe has the characteristics of high precision, high real-time performance and high sensitivity, the monitoring on the running state of equipment is more real-time and accurate, the economic loss caused by the fault of the equipment is avoided, and because the output of analog quantity must be transmitted through signal lines, each equipment is provided with a signal line, sometimes the distance between the equipment and a main control room is long, and the used signal lines are far.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a temperature signal circuit diagram of the present invention;
FIG. 3 is a schematic circuit diagram of the liquid level measurement principle of the present invention;
FIG. 4 is a circuit diagram of a regulated power supply for a vibration sensor of the present invention;
FIG. 5 is a circuit diagram of a vibration sensor of the present invention;
in the figure: the cable leading-out hole cover 1, the upper cover 2, the shell 3, the circuit board 4, the lower cover 9 and the probe rod 11;
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to the attached drawings 1 to 5, the invention discloses a digital three-parameter safety monitoring probe, which comprises an outlet hole cover 1, an upper cover 2, a shell 3, a circuit board 4, a lower cover 9, a probe rod 11, an electrode plate, a temperature sensor, an oil level electrode and a vibration sensor, wherein the outlet hole cover comprises:
the upper cover 2, the lower cover 9 and the shell 3 form a whole, a cable leading-out hole is formed in the upper cover 2, when no cable is led out, the leading-out hole cover 1 covers the cable leading-out hole, the probe rod 11 is a circular tube with an opening at the lower end, the probe rod 11 extends out of the lower cover 9, and the probe rod 11 extends into a workplace when the cable leading-out cover is used;
the temperature sensor and the oil level electrode are arranged on an electrode plate (not shown in the figure), and the electrode plate is arranged in the probe rod;
the temperature sensor is PT 100;
the vibration sensor adopts a piezoelectric acceleration chip ADXL345 and is arranged on the circuit board 4;
the circuit board 4 comprises a temperature signal circuit, a liquid level signal circuit and a vibration signal circuit;
the temperature signal processing circuit comprises resistors R29, R30, R31, R32, R33, R34 and R39, an operational amplifier OP07 and a voltage regulator tube D3;
the R29, R30, R34 and PT100 temperature sensors form a Venturi bridge, and a bridge circuit is amplified by an operational amplifier OP07 and then output;
R29＝R30＝R32＝R33＝1K,R34＝100,R31＝R39＝100K；
in order to protect the STM32 chip from being burnt out due to overlarge input voltage, a 3.3V voltage stabilizing diode D3 is added at the output end of the temperature signal circuit;
the liquid level signal circuit comprises resistors R1 and R2, a capacitor C2, a time-base integrated chip NE 555: the resistors R1 and R2, the capacitor C2, the time-base integrated chip NE555 and the capacitor to be tested form a multi-harmonic oscillation circuit;
the vibration signal circuit comprises an RT9161 power supply chip, capacitors C3, C4, C5 and C6, resistors R11, R12, R13, R14 and R15;
an RT9161 power supply chip, capacitors C3, C4, C5 and C6 form a 3.3v stabilized voltage supply which supplies power to the acceleration chip ADXL 345;
a 0 ohm resistor is connected between the pin 6 of the acceleration chip ADXL345 and a power supply;
a pull-up resistor of 10k is connected between the pin 7, the pin 13 and the pin 14 and a power supply;
C3＝C5＝10uF,C4＝C6＝0.1uF,R11＝R14＝0,R12＝R13＝R15＝10K。
the preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. The utility model provides a digital three parameter safety monitoring probe, characterized by includes probe rod, lower cover, circuit board, casing, upper cover, plate electrode, temperature sensor, oil level electrode, vibration sensor:
the lower cover, the shell and the upper cover form a whole, a cable leading-out hole is formed in the upper cover, and the probe rod extends out of the lower cover;
the temperature sensor and the oil level electrode are arranged on the electrode plate;
the temperature sensor is PT 100;
the probe rod is a circular tube with an open lower end, and the electrode plate is arranged in the probe rod;
the vibration sensor adopts a piezoelectric acceleration chip ADXL345 and is arranged on the circuit board;
the circuit board comprises a temperature signal circuit, a liquid level signal circuit and a vibration signal circuit.
2. The digital three-parameter safety monitoring probe according to claim 1, wherein the temperature signal processing circuit comprises resistors R (29), R (30), R (31), R (32), R (33), R (34), R (39), an operational amplifier OP07, a voltage regulator tube D3;
the temperature sensors of the R (29), the R (30), the R (34) and the PT100 form a Venturi bridge, and bridge circuit current is amplified by an operational amplifier OP07 and then output.
3. A digitized three-parameter security monitoring probe as claimed in claim 2, wherein R (29), R (30), R (32), R (33), R (34), R (31), R (39), R (100K).
4. A digital three-parameter safety monitoring probe according to claim 2, wherein a 3.3V zener diode D3 is added at the output end of the temperature signal circuit.
5. The digital three-parameter safety monitoring probe according to claim 1, wherein the liquid level signal circuit comprises resistors R1, R2, a capacitor C2, a time-base integrated chip NE 555:
the resistors R1 and R2, the capacitor C2, the time base integrated chip NE555 and the capacitor to be tested form a multi-harmonic oscillation circuit.
6. A digital three-parameter safety monitoring probe according to claim 1, wherein the vibration signal circuit comprises an RT9161 power chip, capacitors C (3), C (4), C (5), C (6), resistors R (11), R (12), R (13), R (14), R (15);
the RT9161 power supply chip, the capacitors C (3), C (4), C (5) and C (6) form a 3.3v voltage-stabilized power supply which supplies power to the acceleration chip ADXL 345;
a 0 ohm resistor is connected between the pin 6 of the acceleration chip ADXL345 and a power supply;
a pull-up resistor of 10k is connected between the pin 7, the pin 13 and the pin 14 and the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011528328.2A CN112729388A (en) | 2020-12-22 | 2020-12-22 | Digital three-parameter safety monitoring probe |
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| CN202011528328.2A CN112729388A (en) | 2020-12-22 | 2020-12-22 | Digital three-parameter safety monitoring probe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115388938A (en) * | 2022-07-13 | 2022-11-25 | 中列(武汉)科技有限公司 | Temperature and pressure sensor |
| CN116436150A (en) * | 2022-01-04 | 2023-07-14 | 广州普瑞电力控制系统设备有限公司 | Intelligent distribution transformer terminal based on state sensing and edge computing technology |
| CN119469323A (en) * | 2025-01-09 | 2025-02-18 | 江阴市华恒仪表有限公司 | A three-parameter combined transmitter using micro-pressure measurement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116436150A (en) * | 2022-01-04 | 2023-07-14 | 广州普瑞电力控制系统设备有限公司 | Intelligent distribution transformer terminal based on state sensing and edge computing technology |
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| CN119469323A (en) * | 2025-01-09 | 2025-02-18 | 江阴市华恒仪表有限公司 | A three-parameter combined transmitter using micro-pressure measurement |
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