CN111780662A - Magnetic-sensitive waterproof angle sensor - Google Patents
Magnetic-sensitive waterproof angle sensor Download PDFInfo
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- CN111780662A CN111780662A CN202010677964.5A CN202010677964A CN111780662A CN 111780662 A CN111780662 A CN 111780662A CN 202010677964 A CN202010677964 A CN 202010677964A CN 111780662 A CN111780662 A CN 111780662A
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- angle sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
Abstract
A magnetic-sensing waterproof angle sensor belongs to the field of sensors. The sensor is provided with an upper bin and a lower bin, a shell end cover made of non-ferromagnetic material and provided with a physical isolation layer in the middle, and a rotating shaft is concentrically fixed at the upper opening end of the shell end cover through bearing connection; at the lower end of the rotating shaft, a permanent magnet with fixed orientation is concentrically arranged at the upper end of the shell end cover by a magnet fixing sleeve, and a rotating magnetic field is formed along with the rotation of the rotating shaft; a sealing oil seal is arranged at the front end of the rotating bearing and used for protecting the bearing to be normally used in a soaking state to a certain extent; the magnetic sensitive detection integrated chip is arranged and welded on a circuit board of the electric signal processing circuit board module when the concentricity precision is required to be kept. The invention completely realizes physical isolation of the rotating part of the angle sensor and the electric signal detection part, realizes absolute waterproof property of the angle sensor by utilizing the characteristic of non-contact signal induction of the magnetic sensitive element to the magnetic field, and is suitable for normal work under high and deep water with pressure. The highest IP68 water resistance rating is achieved.
Description
Technical Field
The invention belongs to the field of sensors, relates to an angle sensor, and particularly relates to a waterproof angle sensor aiming at a magnetic sensitivity principle.
Background
Currently, angle sensors are widely used in industrial automatic control systems such as servo control systems, industrial robots, numerical control machines, vehicles, textiles, engineering machinery, petrochemical industry, coal mine machinery, water conservancy electric power, and water transportation ships. For many applications, it is often desirable to use the device in open air or outdoor conditions, in situations where the device is subjected to wind, rain, or even muddy immersion or is subjected to a certain depth of water pressure. This places a need for the use of waterproof functionality for angle sensors with dynamic rotation measurement.
Angle sensors are mainly classified into several types from the physical effect or principle, respectively, conductive plastics, photoelectric type, capacitive grating type, and magnetoelectric type. The conductive plastic type angle sensor, the electrical signal extraction belongs to the contact type. The annular conductive film is made of conductive plastic materials, and the fixed electrodes at two ends and the wear-resistant conductive contact connected with the rotating shaft form a voltage division output structure to realize the rotation of the rotating shaft and the output of an electric signal of output voltage. In addition to the contact wear, water, oil, dust, etc. may cause a change in contact resistance of the contact, affecting the accuracy of the output electrical signal. If the waterproof function is realized, only the sealing of the shell structure is relied on. The photoelectric angle sensor is characterized in that a central rotating shaft drives a photoelectric coded disc, and light and dark scribed line stripes on the photoelectric coded disc are identified through a photoelectric transmitting and receiving tube and a moire fringe technology, so that the measurement of the rotating angle or the displacement is realized. The higher the measurement precision is, the smaller the light and shade stripe interval of the photoelectric coded disc is, and if water, oil, dust, salt mist and the like are immersed, the recognition rate of the photoelectric device can be reduced, and the accuracy of angle measurement is influenced. The capacitive grating type angle sensor depends on two polar plates etched with metal periodic conductive interval stripes to keep a certain gap to form a capacitive grating, and when the two polar plates rotate relatively, the capacitance between the two polar plates changes periodically, so that the inherent excitation frequency changes to realize angle measurement. If media such as water, oil, dust and the like exist between the polar plates, the capacitance between the electrodes can be changed, and the measurement accuracy is influenced. The angle sensors with different principles can only be generally solved by sealing the sensor shell and the electric signal processing circuit and performing waterproof gluing treatment to realize better environmental use characteristics, particularly a waterproof function. The general magnetic-sensing angle sensor adopts a triggering permanent magnet fixed on a rotating shaft in a specific direction, and changes of a rotating magnetic field are converted into electric signals in various output forms through a magnetic-sensing element induced by a non-contact signal. The shock resistance, corrosion resistance, pollution resistance and waterproofness of the magnetic-sensing angle sensor are obviously improved compared with the angle sensor based on the principle after waterproof treatment such as shell sealing. However, when the angle sensor measures, the relative rotation between the rotating shaft and the fixed shell is certain, so that strong water pressure exists in the presence of water, particularly in deep water, and certain technical difficulty still exists in water penetration resistance. If corrosive liquid, salt fog and the water-proof sealing agent are used under the long-term high-humidity working condition, the use requirement of complete water resistance can not be met only by external waterproof sealing treatment.
Disclosure of Invention
The invention aims to utilize the basic principle of magnetic sensitive physical effect, adopt high-sensitivity magnetic sensitive components and parts, and realize physical isolation of a rotating part and an electric signal sensing part of an angle sensor through a mechanical structure, thereby realizing the purpose of fundamentally solving the waterproof problem of working under pressure in a deep water use state in the dynamic detection process of the angle sensor, improving the comprehensive environment applicability of the angle sensor, further expanding the application scene and the use working condition of the angle sensor and greatly improving the quality of the angle sensor.
To achieve the above object, embodiments of the present invention are as follows:
a magnetic-sensitive waterproof angle sensor is characterized by comprising: the device comprises a shell end cover, a rotating shaft, a rotating bearing, a magnet fixing sleeve, a permanent magnet, a bearing oil seal, a magnetic sensitive detection integrated chip, a circuit board of an electric signal processing module, sealant, an output lead and a sensor rear cover; the core component of the magnetic-sensing waterproof angle sensor is a shell end cover which is provided with an upper bin and a lower bin, wherein a non-ferromagnetic material physical isolation layer is arranged in the middle of the shell end cover; at the lower end of the rotating shaft, a fixed-orientation permanent magnet is concentrically arranged at the upper bin end of the shell end cover through a magnet fixing sleeve, and a rotating magnetic field can be formed along with the rotation of the rotating shaft. A sealing oil seal is arranged at the front end outside the rotating bearing and used for protecting the bearing from being normally used in a water immersion state to a certain extent; the magnetic sensitive detection integrated chip is kept to be concentric with the rotating magnetic field, and the magnetic sensitive detection integrated chip is required to be arranged and welded on a circuit board of the electric signal processing circuit board module.
Further, the shell end cover is made of non-ferromagnetic materials, including aluminum, copper, titanium and alloy materials.
Furthermore, the concentricity of the upper bin and the lower bin is required to be kept within the action tolerance of +/-0.001- +/-2 mm when required to be accurate during processing.
Further, the bearing is a single bearing, a shaft sleeve or a bearing set.
Furthermore, the circuit board with the electric signal processing module is circular, and the concentricity precision of the circuit board and the magnetic sensitive detection integrated chip is within +/-0.001- +/-2 mm.
Further, the magnetic sensitive integrated chip can be a hall device, an integrated microprocessor quadrature differential hall device, a semiconductor magneto-resistor (SMR), a metal anisotropic magneto-resistor (AMR), a giant magneto-resistor (GMR) or a tunnel junction giant magneto-resistor (TMR), a giant magneto-impedance (GMI), and other sensitive elements.
Furthermore, a circuit board of the electric signal processing module is provided with a Microprocessor (MCU), a power supply processing circuit, an analog output or digital output conversion circuit, a temperature compensation circuit and anti-interference and various protection circuits; the MCU is utilized to realize control functions of range conversion, linearity calibration, temperature correction, watchdog protection restart and the like through programming, and the precision and the reliability of the waterproof angle sensor are improved.
Further, the distance L between the magnetic sensitive element in the magnetic sensitive detection integrated chip and the permanent magnet is a key parameter of the invention. The determination of the magnetic sensor needs to be comprehensively determined according to the mechanical size of the magnetic sensor, the grade of a magnetic material, different working principles of the magnetic sensor and the thicknesses of the spacing layers of the upper chamber and the lower chamber of the shell. The magnetic sensitive element can sense the rotating magnetic field of the permanent magnet and ensure the measurement precision; the range is 0.2-15 mm.
Furthermore, the bin below the shell is filled with the output lead welded on the back of the non-sensitive element of the circuit board by waterproof sealant, and the rear end covers are cured together, so that a completely waterproof working state is realized.
The design of the invention utilizes the non-contact signal induction characteristic of the magnetic-sensing angle sensor, adopts the mechanism for generating angle rotation and the electric signal acquisition circuit part to be completely physically isolated, and realizes extremely excellent waterproof performance. Can be suitable for complicated and severe use occasions with extremely corrosion resistance and pollution resistance in deep water under pressure.
The invention has the greatest characteristic that the rotation part of the angle sensor is completely physically isolated from the electric signal detection part, and the absolute waterproof characteristic of the angle sensor is realized by utilizing the characteristic that the magnetic sensitive element is used for non-contact signal induction of a magnetic field, so that the angle sensor can be suitable for normal work under high and deep water under the condition of pressure. The highest IP68 level waterproof grade is realized.
If the outer end face of the integral waterproof angle sensor is treated by methods such as corrosion prevention, salt mist prevention, acid and alkali resistance, spray painting or plastic spraying, and the like, the excellent performance of keeping long-term stable work in extremely severe use environments can be realized.
Drawings
Fig. 1 is a schematic structural diagram of a main body of a magnetic angle sensor according to embodiment 1, including: the sensor comprises a shell end cover 1, a rotating shaft 2, a rotating bearing 3, a magnet fixing sleeve 4, a permanent magnet 5, a bearing oil seal 6, a magnetic sensitive detection integrated chip 7, a circuit board 8 of an electric signal processing module, a sealant 9, an output lead 10 and a sensor rear cover 11;
Detailed Description
Example 1
The magnetic-sensing waterproof angle sensor comprises a shell end cover 1, a rotating shaft 2, a rotating bearing 3, a magnet fixing sleeve 4, a permanent magnet 5, a bearing oil seal 6, a magnetic-sensing detection integrated chip 7, a circuit board 8 of an electric signal processing module, a sealant 9, an output lead 10 and a sensor rear cover 11. The magnetic-sensing waterproof angle sensor is provided with an upper bin and a lower bin, and the shell end cover 1 is made of a non-ferromagnetic material with a physical isolation layer in the middle and can be made of aluminum, copper, titanium and alloy materials. The concentricity of the upper bin and the lower bin needs to keep the required precision requirement during processing, and the behavior tolerance of the concentricity is generally between +/-0.001 to +/-2 mm. The rotating shaft 2 is connected and concentrically fixed at the upper opening end of the shell end cover 1 through a bearing 3. The bearing 3 may be a single bearing, a bushing or a bearing set. At the lower end of the rotating shaft 2, a permanent magnet 5 with a certain direction is concentrically arranged at the upper end of the shell end cover 1 by a magnet fixing sleeve 4. As the rotating shaft rotates, a rotating magnetic field can be formed. A sealing oil seal 6 is arranged at the front end of the rotary bearing and used for protecting the bearing to be normally used in a water immersion state to a certain extent.
The magnetic sensitive detection integrated chip 7 is arranged and welded on a circuit board 8 of the electric signal processing module under the requirement of keeping the concentricity precision, the circuit board 8 is generally prepared into a circular shape, the technical requirement of concentric installation is conveniently met, and the concentricity precision of the magnetic sensitive detection integrated chip is required to be within +/-0.001- +/-2 mm. The magnetic sensitive detection integrated chip 7 can be a hall device, an orthogonal differential hall device of an integrated microprocessor, a Semiconductor Magnetoresistor (SMR), a metal Anisotropic Magnetoresistor (AMR), a Giant Magnetoresistor (GMR), a tunnel junction giant magnetoresistor (TMR), a Giant Magnetoimpedance (GMI) and other sensitive elements.
A circuit board 8 of the electric signal processing module is provided with a Microprocessor (MCU), a power supply processing circuit, a conversion circuit for analog quantity output or digital quantity output, a temperature compensation circuit and an anti-interference and various protection circuits. The MCU is utilized to realize control functions of range conversion, linearity calibration, temperature correction, watchdog protection restart and the like through programming, and the precision and the reliability of the waterproof angle sensor are improved.
The distance L between the magnetic sensitive detection integrated chip 7 and the permanent magnet 5 is a key parameter of the invention. The determination of the magnetic sensor needs to be comprehensively determined according to the mechanical size of the permanent magnet 5, the grade of the magnetic material, different working principles of the magnetic sensitive elements and the thicknesses of the spacing layers of the upper chamber and the lower chamber of the shell. The magnetic sensitive element in the magnetic sensitive detection integrated chip 7 can sense the rotating magnetic field of the permanent magnet 5 and ensure the measurement precision. Generally, the thickness is between 0.2 and 10 mm.
The chamber under the housing 1 can be filled with a waterproof sealant to the output leads 10 soldered to the back of the non-sensitive components of the circuit board 8 and the rear end cap 11 is cured together. The working state of complete water resistance is realized.
Claims (9)
1. A magnetic-sensitive waterproof angle sensor is characterized by comprising: the sensor comprises a shell end cover (1), a rotating shaft (2), a rotating bearing (3), a magnet fixing sleeve (4), a permanent magnet (5), a bearing oil seal (6), a magnetic sensitive detection integrated chip (7), an electric signal processing circuit board module (8), a sealant (9), an output lead (10) and a sensor rear cover (11); the core component of the magnetic-sensing waterproof angle sensor is a non-ferromagnetic material shell end cover (1) which is provided with an upper bin and a lower bin, and a physical isolation layer is arranged in the middle; the concentricity of the upper bin and the lower bin is required to keep the required precision requirement during processing, and the rotating shaft (2) is connected and concentrically fixed at the upper opening end of the shell end cover (1) through a bearing (3); the permanent magnet (5) is concentrically arranged at the upper end of the shell end cover (1) at the lower end of the rotating shaft (2) through a magnet fixing sleeve (4), and a rotating magnetic field can be formed along with the rotation of the rotating shaft; a sealing oil seal (6) is arranged at the front end of the rotating bearing and used for protecting the bearing to be normally used in a soaking state to a certain extent; the magnetic sensitive detection integrated chip (7) is arranged and welded on a circuit board of the electric signal processing circuit board module (8) under the requirement of keeping the concentricity precision.
2. A magneto-sensitive waterproof angle sensor according to claim 1, characterized in that the housing end cap (1) is made of non-ferromagnetic material including aluminum, copper, titanium and alloy material.
3. The magnetically sensitive waterproof angle sensor as claimed in claim 1, wherein the concentricity of the upper and lower chambers is maintained within a range of +/-0.001 to +/-2 mm within a required concentricity tolerance.
4. A magnetically sensitive water-proof angle sensor according to claim 1, characterized in that the bearing (3) is a single bearing, a bushing or a bearing set.
5. The magnetic-sensing waterproof angle sensor according to claim 1, wherein the circuit board (8) with the electric signal processing circuit board module is circular, and the concentricity precision with the high-sensitivity magnetic-sensing integrated chip (7) is within ± 0.001 to ± 2 mm.
6. A magneto-sensitive waterproof angle sensor according to claim 1 or 5, characterized in that the magneto-sensitive integrated chip (7) can be a Hall device, an integrated microprocessor quadrature differential Hall device, a semiconductor magneto-resistor (SMR), a metal anisotropic magneto-resistor (AMR), a giant magneto-resistor (GMR), a tunnel junction giant magneto-resistor (TMR) or a giant magneto-impedance (GMI) sensor.
7. The magnetic-sensing waterproof angle sensor of claim 1 or 5, characterized in that the circuit board (8) with the electric signal processing module is designed with a Microprocessor (MCU), a power supply processing circuit, a conversion circuit of analog output or digital output, a temperature compensation circuit, an anti-interference and various protection circuits; the MCU is utilized to realize the functions of range conversion, linearity calibration, temperature correction and watchdog protection restarting control through programming, and the precision and the reliability of the waterproof angle sensor are improved.
8. The magnetic-sensing waterproof angle sensor according to claim 1, wherein the distance L between the magnetic-sensing element in the magnetic-sensing detection integrated chip (7) and the permanent magnet (5) is preferably such that the magnetic-sensing element can sense the rotating magnetic field of the permanent magnet and ensure the measurement accuracy; the range is 0.2-15 mm.
9. The magnetically sensitive waterproof angle sensor as claimed in claim 1, characterized in that the output leads (10) welded to the back of the circuit board non-sensitive components are filled with waterproof sealant in the chamber below the housing end cap (1) and the rear end cap (11) is cured together to achieve a completely waterproof working state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010677964.5A CN111780662A (en) | 2020-07-15 | 2020-07-15 | Magnetic-sensitive waterproof angle sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010677964.5A CN111780662A (en) | 2020-07-15 | 2020-07-15 | Magnetic-sensitive waterproof angle sensor |
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| CN111780662A true CN111780662A (en) | 2020-10-16 |
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| CN202010677964.5A Pending CN111780662A (en) | 2020-07-15 | 2020-07-15 | Magnetic-sensitive waterproof angle sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114858051A (en) * | 2021-05-08 | 2022-08-05 | 黑龙江大学 | Angle sensor and manufacturing process thereof |
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| CN204831171U (en) * | 2015-07-23 | 2015-12-02 | 郑州嘉晨电器有限公司 | Novel rotary angle transmitter |
| CN206056854U (en) * | 2016-08-31 | 2017-03-29 | 歌尔股份有限公司 | Pressure transducer |
| CN206056496U (en) * | 2016-09-26 | 2017-03-29 | 宜春学院 | A kind of Hall angular transducer |
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| CN210268523U (en) * | 2019-07-29 | 2020-04-07 | 上海思博机械电气有限公司 | Non-contact angular displacement potentiometer |
| CN210833762U (en) * | 2019-11-22 | 2020-06-23 | 深圳市昊华电气有限公司 | Waterproof digital display level sensor |
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2020
- 2020-07-15 CN CN202010677964.5A patent/CN111780662A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002315292A (en) * | 2001-04-09 | 2002-10-25 | Matsushita Electric Ind Co Ltd | Position sensor for brushless motor |
| CN2630798Y (en) * | 2003-01-30 | 2004-08-04 | 北京科大天宇微电子材料技术开发有限公司 | Huge magneto-resistance magnetic coder |
| CN201955060U (en) * | 2010-12-16 | 2011-08-31 | 上海航盛实业有限公司 | Non-contact angle sensor |
| CN204649262U (en) * | 2015-04-17 | 2015-09-16 | 秦剑 | Throw-in type liquid transmitter |
| CN204831171U (en) * | 2015-07-23 | 2015-12-02 | 郑州嘉晨电器有限公司 | Novel rotary angle transmitter |
| CN206056854U (en) * | 2016-08-31 | 2017-03-29 | 歌尔股份有限公司 | Pressure transducer |
| CN206056496U (en) * | 2016-09-26 | 2017-03-29 | 宜春学院 | A kind of Hall angular transducer |
| CN107655537A (en) * | 2017-09-19 | 2018-02-02 | 邢盼盼 | Intelligent water level moisture recorder |
| CN210268523U (en) * | 2019-07-29 | 2020-04-07 | 上海思博机械电气有限公司 | Non-contact angular displacement potentiometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114858051A (en) * | 2021-05-08 | 2022-08-05 | 黑龙江大学 | Angle sensor and manufacturing process thereof |
| CN114858051B (en) * | 2021-05-08 | 2024-02-27 | 黑龙江大学 | Angle sensor and manufacturing process thereof |
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