CN115901562A - High-precision magnetic plug type abrasive particle sensor - Google Patents
High-precision magnetic plug type abrasive particle sensor Download PDFInfo
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- CN115901562A CN115901562A CN202211706969.1A CN202211706969A CN115901562A CN 115901562 A CN115901562 A CN 115901562A CN 202211706969 A CN202211706969 A CN 202211706969A CN 115901562 A CN115901562 A CN 115901562A
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- sensor
- magnetic plug
- plug type
- permanent magnet
- abrasive particle
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- 239000002245 particle Substances 0.000 title claims abstract description 41
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 239000012212 insulator Substances 0.000 claims abstract description 10
- 239000000523 sample Substances 0.000 claims abstract description 10
- 230000005284 excitation Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000005299 abrasion Methods 0.000 claims description 4
- 230000005294 ferromagnetic effect Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000003745 diagnosis Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 6
- 239000006061 abrasive grain Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention relates to the technical field of oil monitoring of mechanical equipment, in particular to a high-precision magnetic plug type abrasive particle sensor; the sensor comprises a probe, a circuit module, an insulator and abrasive particles, wherein the probe comprises a detection unit and a reference unit, and both the detection unit and the reference unit are composed of a permanent magnet and a sensor element, and the bridge circuit is subjected to linearization processing while the sensitivity of the sensor is improved, so that the calibration and data processing are facilitated, and the accuracy of the sensor is further improved. On the basis of a signal output principle, the magnetic plug type abrasive particle sensor with simple structure and low cost has high sensitivity and accuracy, and is widely applied to early online fault diagnosis and maintenance of mechanical equipment.
Description
Technical Field
The invention relates to the technical field of oil monitoring of mechanical equipment, in particular to a high-precision magnetic plug type abrasive particle sensor.
Background
With the higher and higher intelligentization and informatization requirements of modern equipment, the method for acquiring the wear information of the equipment in real time has important significance on preventive maintenance and protection and prevention of catastrophic failures, almost 80% of metal parts of mechanical equipment are made of steel in the fields of agriculture, automobiles, aviation and the like, and the method has high practical value in researching sensors capable of continuously monitoring the wear of steel mechanical parts.
The magnetic plug type abrasive particle sensor captures ferromagnetic particles in oil by using a permanent magnet, and then obtains abrasion information based on a resistance principle, a capacitance principle or an inductance principle. The sensor is simple in structure and low in cost, and can extract abrasive particles from oil to prevent secondary wear. However, early failure diagnosis of mechanical equipment cannot be realized due to insufficient detection accuracy, and has been forgotten for a long time. Muthuvel places the planar inductor coil above the permanent magnet to make a magnetic sensor, which shortens the distance between the inductor coil and the particles and improves the sensitivity. Yuan places the coil in the annular permanent magnet, optimizes the permanent magnet and the relevant parameters of the coil through finite element analysis, and improves the sensitivity. Shi comprehensively analyzes the iron particle information by reducing the sizes of the permanent magnet and the coil and combining an inductance bridge circuit and a capacitance bridge circuit, so that the sensitivity is improved. However, the reduction in size sacrifices the particle capture rate and is detrimental to the utility of the magnetic plug sensor. In addition, the magnetic plug sensor has not analyzed and corrected the nonlinearity of the output characteristic, and has a certain degree of defect in accuracy.
Disclosure of Invention
The invention aims to provide a high-precision magnetic plug type abrasive particle sensor, and aims to solve the problem of insufficient precision of the existing magnetic plug type sensor.
In order to achieve the above object, the present invention provides a high-precision magnetic plug-type abrasive grain sensor, including a probe, a circuit module, an insulator, and abrasive grains, wherein the probe includes a detection unit and a reference unit, and is composed of a permanent magnet and a sensor element, the insulator is disposed between the detection unit and the reference unit, and the abrasive grains are disposed on one side of the permanent magnet.
When the sensor is arranged in a hydraulic system or an oil tank, ferromagnetic particles continuously generated by abrasion in the operation process of mechanical equipment in oil are continuously captured, and electric signals related to the mass concentration of abrasive particles are taken as Z by the permanent magnet and the sensor element respectively 1 And Z 2 A resistance element R 1 And R 2 Operational amplifiers are arranged in the circuit module, us is an excitation voltage, U 0 Is an output voltage, a resistance element R 1 And R 2 The resistance is equal to R as much as possible, and the signal output characteristic is as follows:
according to the high-precision magnetic plug type abrasive particle sensor, the detection unit and the reference unit have the same structure and are composed of the permanent magnet and the sensing unit, iron particles are captured by the permanent magnet in the detection unit and then are magnetized to cause the change of the inductance value of the delta Z of the sensing unit, us is excitation voltage, U is the excitation voltage 0 Is the output voltage, the sensor output characteristic is:
conversely, if the magnetic plug type abrasive particle sensor is combined with a bridge circuit, the output characteristics of the sensor are:
the detection unit and the reference unit are placed in oil under the same environmental condition, only the permanent magnet of the detection unit is used for capturing the abrasive particles in the oil due to the insulator between the detection unit and the reference unit, only the sensing element of the detection unit can sense the enhancement effect of the abrasive particles on a magnetic field, the reference unit and the sensing unit are placed in the same environment, but the permanent magnet does not capture the abrasive particles, and the sensing element only responds to the environment.
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 embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only 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 circuit for correcting non-linearity of a bridge of a high-precision magnetic plug type abrasive particle sensor provided by the invention.
Fig. 2 is a bridge circuit of a high-precision magnetic plug type abrasive particle sensor provided by the invention.
Fig. 3 is a schematic diagram of a sensor structure of a high-precision magnetic plug type abrasive particle sensor provided by the invention.
1-probe, 2-circuit module, 3-reference unit, 4-permanent magnet, 5-abrasive grain, 6-detection unit, 7-insulator, 8-sensor element.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1 to 3, fig. 1 is a circuit for correcting non-linearity of a bridge of a high-precision magnetic plug type abrasive particle 5 sensor according to the present invention, fig. 2 is a circuit for a bridge of a high-precision magnetic plug type abrasive particle 5 sensor according to the present invention, and fig. 3 is a schematic diagram of a sensor structure of a high-precision magnetic plug type abrasive particle 5 sensor according to the present invention.
The invention provides a high-precision magnetic plug type abrasive particle 5 sensor, which comprises a probe 1, a circuit module 2, an insulator 7 and abrasive particles 5, wherein the probe 1 comprises a detection unit 6 and a reference unit 3, is composed of a permanent magnet 4 and a sensor element 8, and is divided into Z 1 And Z 2 A resistance element R 1 And R 2 Operational amplifiers are arranged in the circuit modules 2, us is the excitation voltage, U 0 Is an output voltage, a resistance element R 1 And R 2 Resistance equal to R as much as possible, said insulator 7 being providedThe abrasive grains 5 are provided on one side of the permanent magnet 4 between the detection unit 6 and the reference unit 3.
In the present embodiment, the detecting unit 6 and the reference unit 3 have the same structure, and are composed of the permanent magnet 4 and the sensing unit, and iron particles are captured by the permanent magnet 4 in the detecting unit 6 and then magnetized to cause a change in inductance of the sensing unit Δ Z, us is an excitation voltage, U is a voltage value, and 0 is the output voltage, the sensor output characteristic is:
in contrast, if the magnetic plug type abrasive grain 5 sensor is combined with a bridge circuit, the output characteristics of the sensor are:
the detection unit 6 and the reference unit 3 are placed in oil under the same environmental conditions, due to the insulator 7 between the detection unit and the reference unit, only the permanent magnet 4 of the detection unit 6 is used for capturing the abrasive particles 5 in the oil, only the sensing element of the detection unit 6 can sense the enhancement effect of the abrasive particles 5 on the magnetic field, the reference unit 3 and the sensing unit are placed in the same environment, but the permanent magnet 4 does not capture the abrasive particles 5, and the sensing element only responds to the environment, so that the output characteristic of the magnetic plug type abrasive particle 5 sensor based on the bridge nonlinear correction circuit provided by the patent has a linear characteristic, the accuracy of the sensor is facilitated, and the problem of insufficient accuracy of the existing magnetic plug type sensor is solved.
Furthermore, when the sensor is arranged in a hydraulic system or an oil tank, ferromagnetic particles which are continuously generated due to abrasion in the operation process of mechanical equipment in oil are continuously captured, and the signal output characteristics of the electric signal are as follows:
while the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A high-precision magnetic plug type abrasive particle sensor is characterized in that,
the high-precision magnetic plug type abrasive particle sensor comprises a probe, a circuit module, an insulator and abrasive particles, wherein the probe comprises a detection unit and a reference unit, the probe is composed of a permanent magnet and a sensor element, the insulator is arranged between the detection unit and the reference unit, and the abrasive particles are arranged on one side of the permanent magnet.
2. A high accuracy magnetic plug grit sensor as in claim 1,
when the sensor is arranged in a hydraulic system or an oil tank, ferromagnetic particles continuously generated by abrasion in the operation process of mechanical equipment in oil are continuously captured, and electric signals related to the mass concentration of the abrasive particles are taken as Z signals respectively by the permanent magnet and the sensor element 1 And Z 2 A resistance element R 1 And R 2 Operational amplifiers are arranged in the circuit module, us is an excitation voltage, U 0 Is an output voltage, a resistance element R 1 And R 2 The resistance is equal to R as much as possible, and the signal output characteristic is as follows:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211706969.1A CN115901562A (en) | 2022-12-29 | 2022-12-29 | High-precision magnetic plug type abrasive particle sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211706969.1A CN115901562A (en) | 2022-12-29 | 2022-12-29 | High-precision magnetic plug type abrasive particle sensor |
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| CN115901562A true CN115901562A (en) | 2023-04-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116124663A (en) * | 2023-04-13 | 2023-05-16 | 北京致感科技有限公司 | Online ferromagnetic particle detection system |
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- 2022-12-29 CN CN202211706969.1A patent/CN115901562A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116124663A (en) * | 2023-04-13 | 2023-05-16 | 北京致感科技有限公司 | Online ferromagnetic particle detection system |
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