CN107906077A - A kind of absolute type ceramic cylinder rod displacement sensor and its measuring method - Google Patents
A kind of absolute type ceramic cylinder rod displacement sensor and its measuring method Download PDFInfo
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- CN107906077A CN107906077A CN201711350961.5A CN201711350961A CN107906077A CN 107906077 A CN107906077 A CN 107906077A CN 201711350961 A CN201711350961 A CN 201711350961A CN 107906077 A CN107906077 A CN 107906077A
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- Prior art keywords
- piston rod
- absolute
- ceramic cylinder
- displacement sensor
- cylinder rod
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
A kind of absolute type ceramic cylinder rod displacement sensor of the present invention, including cylinder barrel, piston rod, detecting head；The annular groove of equal width, deep equality, spacing not etc. is carved with piston rod metallic rod body, it is spaced at slotless between annular groove and annular groove and closely combines to form absolute coding positional information, the detecting head is fixed on the junction of cylinder barrel and piston rod and is arranged at intervals with piston rod, magnetic resistance sensor array module is set in detecting head, the magnetic resistance sensor array module is arranged in piston rod moving process, is spaced for detecting groove on piston rod to obtain absolute coding positional information.It can realize Absolute position measurement, not be afraid of power down；Coding is measured apart from overlength suitable for the hydraulic cylinder travel of various ranges；Measure it is contactless, it is never wornout.Can be widely applied to water conservancy and hydropower, industrial machinery, communications and transportation, environmentally protective, war industry equipment etc. needs to use the field of hydraulic cylinder.
Description
Technical field
The present invention relates to a kind of new absolute type ceramic cylinder rod displacement sensor and its measuring method, belong to instrument instrument
The new measuring method of contactless hydraulic cylinder travel detection in table technical field.
Background technology
In Modern Water Conservancy hydropower industry, the keying of gate is promoted by hydraulic cylinder mostly.People need to know at any time
The aperture state of gate, then installs device for detecting distance of travel on hydraulic cylinder, to detect the stroke of piston rod, so as to detect lock
The numerical value of door aperture.At present, the displacement sensor device of common measurement gatage has a variety of forms, is broadly divided into three
Kind：Wire rope rotating encoder, black ceramic piston rod add CIMS stroke detections, magnetostrictive displacement sensor.
Wire rope rotating encoder is product ripe earliest in hydraulic engineering, its critical piece has：Rotary encoder,
Steel wire rope, automatic cable winder.Its measuring principle is：When hydraulic cylinder ceramic cylinder rod moves, steel wire rope is pulled and band
Dynamic rotary encoder rotation, therefrom just learns the distance of ceramic cylinder rod movement, so as to draw the aperture of gate.Wire rope rotating
Installation of the encoder on hydraulic cylinder is divided into built-in and external.Built-in precision is high, and strong interference immunity is affected by environment
Small, without considering winter Anti-freezing problem, the drawback is that installation requirement is higher, live maintenance is difficult, once steel wire rope is drawn
It is disconnected, it is likely that damage hydraulic cylinder inwall processing face, this is not only the replacement of sensor, further relates to the damage of hydraulic cylinder in itself
It is huge with dismounting, quantities.External steel wire rope can be used as individual components to be installed on hydraulic pressure cylinder surfaces or lock wall, although effectively
The shortcomings that built-in is avoided, but this mounting means is larger by such environmental effects, especially when steel wire rope is immersed in the water, water
The factors such as stream impact, water surface icing, water float thing can all make reading misalignment.Skid and zero point drift in addition, steel wire rope also exists
The problems such as shifting, influence reading stability.
Ceramic cylinder rod sensor is also one of more common product in hydraulic engineering, and critical piece has：Ceramic piston
Bar, CIMS device for detecting distance of travel.Ceramic cylinder rod has done cutting pretreatment, CIMS device for detecting distance of travel peace before ceramic coated
Determine that ceramics are living mounted in the junction of hydraulic cylinder and ceramic cylinder rod, and by gathering the small teeth groove of the multirow on ceramic cylinder rod
The displacement of stopper rod.This kind of sensor can not realize absolute coding mostly, must be detected after power-off since zero-bit, this is in commercial Application
It is a major defect in environment, minority realizes absolute coding, but is all encoded using multirow, and manufacture is difficult, of high cost.
For magnetostriction class displacement sensor mostly using built-in, its central principle is that waveguide is moved in magnetic field and sent
Electric signal determines displacement.Although this kind of sensor can obtain higher precision, it is detected, and length is longer, and error is then got over
Greatly, for its range mostly in 5 meters, stroke is long also restricted to hydraulic cylinder works state at present, meeting during hydraulic cylinder horizontality
Cause waveguide to be worn because amount of deflection is bent, cause the service life of sensor to shorten, later maintenance is also inconvenient.
The content of the invention
The present invention is directed to the use defect of the above-mentioned prior art, proposes that a kind of new absolute type ceramic cylinder rod displacement passes
Sensor, it is possible to achieve Absolute position measurement, is not afraid of power down；Coding is surveyed apart from overlength suitable for the hydraulic cylinder travel of various ranges
Amount；Measure it is contactless, it is never wornout.
On this basis, the present invention further provides a kind of measuring method can accurately measure ceramic cylinder rod displacement and
Absolute position values, its range ability is from tens millimeters to tens meters, and high certainty of measurement.
The present invention is in order to solve the above technical problems, adopt the following technical scheme that：
A kind of absolute type ceramic cylinder rod displacement sensor, including cylinder barrel, piston rod, detecting head；Carved on piston rod metallic rod body
There is the annular groove of equal width, deep equality, spacing not etc., covered and filled by ceramic layer in all annular grooves, and it is ceramic in groove
Layer surface and groove be outer, and surface ceramii layer is concordant forms one；It is characterized in that：Interval at slotless between annular groove and annular groove
Arrangement closely combine to form absolute coding positional information, the detecting head be fixed on the junction of cylinder barrel and piston rod and with
Piston rod is arranged at intervals, and magnetic resistance sensor array module is set in detecting head, and the magnetic resistance sensor array module is set
In piston rod moving process, to be spaced for detecting groove on piston rod to obtain absolute coding positional information.
Further, cable is connected on the detecting head, comprising power cord and data cable, for powering and transmitting data.
Further, close-packed arrays interval combines to be formed at the slotless between the annular groove and annular groove on the piston rod
Absolute location information, it is 1 that the unit comprising an annular groove, which has groove region, and one at slotless has groove region equal length with unit
Unit ungrooved region be 0, unit has groove region and unit ungrooved region close-packed arrays not overlapping, with binary number arrangement form
Set the absolute position encoder of digit.
Further, it along length shared by piston rod is 4mm that unit, which has groove region or unit ungrooved region, absolute position encoder
For 16 bits.
Further, multiple magnetic resistance sensors, each magnetic are equidistantly placed with the magnetic resistance sensor array module
Electric resistance sensor is in line distribution along the direction vertical with piston rod, has the one side of magnetic resistance sensor close to piston rod, and its
Array spacings direction is consistent with the ceramic cylinder rod direction of motion.
Further, above-mentioned range ability is from tens millimeters to tens meters.
A kind of measuring method using absolute type ceramic cylinder rod displacement sensor, by the volume containing absolute location information
Code, is expressed by the processing of cutting on the piston rod, and is changed using magnetic resistance sensor array module induced field is strong and weak,
And sine and cosine waveform is exported, the accurate displacement and absolute position values for measuring piston rod.
Further, the setting digit absolute position encoder of the binary number arrangement form is generated at random using rolling
Mode, minimum movement interval are unit binary number length；Detecting head reads the binary coding of setting digit, and first place moves into one
Bit, end remove a bit, form the binary coding of new setting digit, the binary coding pair
Absolute position at this time is answered, counter motion is similarly.
Further, during detecting head obtains absolute location information, while electronic features can be carried out to absolute position
Point, to obtain the precision of a quarter of unit binary number length.
To sum up, relative to the prior art, absolute type ceramic cylinder rod displacement sensor of the present invention, is carved with ceramic cylinder rod
The ring-shaped groove of width deep equality, spacing not etc., the arrangement of these grooves include absolute location information.Detecting head installation is solid
The junction of cylinder barrel and ceramic cylinder rod is scheduled on, it is contactless with ceramic cylinder rod relative movement, and groove sequence is visited
Survey, so as to draw absolute location information.It can realize non-contact measurement, its range is almost unrestricted, it is possible to achieve definitely
Position measurement, is not afraid of power down；Coding is measured apart from overlength suitable for the hydraulic cylinder travel of various ranges；Measure it is contactless, never
Abrasion.Can be widely applied to water conservancy and hydropower, industrial machinery, communications and transportation, environmentally protective, war industry equipment etc. needs to use hydraulic cylinder
Field.
Brief description of the drawings
Fig. 1 is the three-dimensional view of absolute type ceramic cylinder rod displacement sensor of the present invention.
Fig. 2 is the TMR array modules detection oscillogram of absolute type ceramic cylinder rod displacement sensor of the present invention.
Fig. 3 is absolute type ceramic cylinder rod displacement sensor ceramic cylinder rod cutting of the present invention and rolling coding schematic diagram.
In Fig. 1-3, each reference numeral corresponds to as follows：1st, cylinder barrel；2nd, ceramic cylinder rod；3rd, detecting head；4th, magneto-resistor passes
Sensor；5th, TMR array modules；6th, annular groove；7th, at slotless；8th, somewhere absolute position encoder；9th, adjacent absolute position is compiled
Code.
Embodiment
The absolute type ceramic cylinder rod displacement sensor structure schematic diagram of the present invention is as shown in Figure 1, Ceramic piston of the present invention
Bar displacement sensor, includes the ceramic cylinder rod 2 that cylinder barrel 1, detecting head 3, metallic rod body outside coated ceramic layer are formed；Metal
It is carved with the annular groove 6 of equal width, deep equality, spacing not etc. on the body of rod, it is exhausted that the combinations of these annular grooves 6 includes binary system
To positional information.Covered in all annular grooves 6 and filled by ceramic layer, and concordant with slotless 7 surface ceramii layer in groove formed
One, makes 2 appearance of ceramic cylinder rod be no different with pot type piston bar；The detecting head 3 is fixed on cylinder barrel 1 and Ceramic piston
2 junction of bar, and it is separated by a distance with 2 surface of ceramic cylinder rod.Include core exploring block TMR arrays in detecting head 3
Module 5, for detecting 6 arranging situation of annular groove on ceramic cylinder rod 2, so as to learn the absolute location information in somewhere.It is described
Equidistantly arrange in TMR array modules 5 multiple magnetic resistance sensors（TMR）4, be in line distribution.The detecting head 3 has TMR's
Simultaneously close to ceramic cylinder rod, and its array direction is consistent with the ceramic cylinder rod direction of motion.
In the present embodiment, the detecting head 3 uses stainless steel, and hermetically sealed encapsulation, and good weatherability, can be chronically at
Used in outdoor adverse circumstances.6 width of annular groove on ceramic cylinder rod 2 is 2mm, depth 2mm, includes an annular groove 6
Unit have groove Regional Representative's binary one, a 7 unit ungrooved region represents Binary Zero at slotless, forms absolute coding,
And unit has groove region（Single 6 groove width of annular groove is plus 7 each 1mm width at the slotless of left and right）Or unit ungrooved region（7 at slotless
In middle 4mm, have the groove region close-packed arrays not overlapping with unit）Shared length is 4mm on ceramic cylinder rod 2, i.e., 1 or
0 unit length is 4mm.When ceramic cylinder rod 2 moves, the Minimum sliding distance that detecting head 3 detects groove is 4mm, i.e.,
TMR array modules 5 export a just/cosine waveform, then electronic fine-grained to waveform progress, its measurement accuracy can reach 1mm.
The TMR array modules 5 are at interval of setpoint distance（Mm grades of distances）Arrange a magnetic resistance sensor（TMR）4, it is more
A magnetic resistance sensor（TMR）4 are spaced to obtain 16 binary codings, such as the absolute position encoder 8 of Fig. 3.Work as ceramics
When piston rod 2 moves, survey coding and roll into a bit along direction of motion one end, opposite direction one end rolls out a binary system
Number, forms the new absolute coding value 9 such as Fig. 3.
The operation principle of the present invention：
The present invention uses New Magnetic Field Controlled electric resistance sensor（TMR）, using the tunneling magnetoresistance of Researches for Magnetic Multilayer Films to magnetic field
Sensed.TMR has very high sensitivity, can detect small changes of magnetic field.The metallic rod body of ceramic cylinder rod 2（One
As be No. 45 steel or steel alloy）With certain magnetic conductivity, after metallic rod body surface groove, having can make magnetic resistance produce change at groove
Change, so as to cause magnetic field power at this to change, when TMR passes through groove, detect the power in magnetic field and be converted into voltage
Sine and cosine change, output detection signal.Detection signal of the single sensor to groove is as shown in Figure 2.
The shift encoding techniques of the present invention, using 16 not repeated encodings, are produced, with two in a manner of rolling and generating at random
System mode is expressed.In 16 binary codings, 1 indicates groove, and 0 represents slotless.With absolute coding
Exemplified by 0001000100010010 (decimal system 4370), as shown in Fig. 3 somewheres absolute position encoder 8：The 2nd, 5,9 are turned left from the right side,
13 are 1, then have groove, and other positions are 0, then slotless.
Further, 16 methods that repeated encoding is not generated at random with rolling produce, such as:Absolute coding
1000100010001001（The decimal system 34953）, move right one, and add 0 or 1 at random, 16 are then taken again, are obtained new
16 data 0001000100010010（The decimal system 4370, as shown in Fig. 3 somewheres absolute position encoder 8）, it is clear that it is random to add
For 0, if plus number be 1, be 0001000100010011（The decimal system 4371, such as the adjacent institute of absolute position encoder 9 in Fig. 3
Show）, whether 16 data then and before being formed compare identical, if there is this group of identical data to want, recalculate.This
Sample constantly moves right one, and adds 0 or 1 at random, then takes 16 data, then more whether repeat, such mode energy
Largely encoded, the data of 16 can produce 50000 continuous not repeated encodings, be calculated by unit 4mm, code length length
Up to 200m.
For the present invention compared with other prior arts, its advantage is as follows：
1. non-contact measurement, service life length, stability is high, and reliability is high.
2. absolute value exports, power on up to absolute position, be not afraid of power down.
3. wide range of measurement, measurable from tens millimeters to tens meters, theoretical code infinite in length system, available for overlength
The displacement measurement of distance.
4. appearance design is compact, exquisite, convenient to install and maintain, maintenance cost is cheap.
5. strong environmental adaptability, different external form materials may be selected in different environment, corrosion-resistant, high pressure resistant, and waterproof, prevent
It is dirt, shockproof, and there is wide in range operating temperature range.
6. high sensitivity, favorable repeatability, the linearity is high, fast response time can reach Millisecond, and resolution ratio can reach
1mm。
7. input DC power is in extensive range, can be from 5V to 40V.A variety of output interface modes are available：RS485、
RS422, SSI, CAN, Modbus, TCP/IP, 4-20mA, 1-5V etc..User can be facilitated to access PC machine, PLC, be also convenient for user
Access all kinds of instrument.
Claims (9)
1. a kind of absolute type ceramic cylinder rod displacement sensor, including cylinder barrel, piston rod, detecting head；On piston rod metallic rod body
The annular groove of equal width, deep equality, spacing not etc. is carved with, is covered and filled by ceramic layer in all annular grooves, and pottery in groove
Enamel coating surface and groove be outer, and surface ceramii layer is concordant forms one；It is characterized in that：Between at slotless between annular groove and annular groove
Closely combine to form absolute coding positional information every arrangement, the detecting head is fixed on the junction of cylinder barrel and piston rod simultaneously
It is arranged at intervals with piston rod, magnetic resistance sensor array module is set in detecting head, the magnetic resistance sensor array module is set
It is set in piston rod moving process, is spaced for detecting groove on piston rod to obtain absolute coding positional information.
2. absolute type ceramic cylinder rod displacement sensor according to claim 1, it is characterised in that：Connect on the detecting head
There is cable, comprising power cord and data cable, for powering and transmitting data.
3. absolute type ceramic cylinder rod displacement sensor according to claim 1, it is characterised in that：On the piston rod
Close-packed arrays interval combines to form absolute location information at slotless between annular groove and annular groove, includes the list of an annular groove
It is 1 that, which there is groove region in position, and it is 0 that one at slotless has the unit ungrooved region of groove region equal length with unit, and unit has groove region
It is not overlapping with unit ungrooved region close-packed arrays, with the absolute position encoder of binary number arrangement form setting digit.
4. absolute type ceramic cylinder rod displacement sensor according to claim 3, it is characterised in that：Unit have groove region or
Unit ungrooved region is 4mm along length shared by piston rod, and absolute position encoder is 16 bits.
5. absolute type ceramic cylinder rod displacement sensor according to claim 1, it is characterised in that：The magneto-resistor sensing
Equidistantly be placed with multiple magnetic resistance sensors in device array module, each magnetic resistance sensor along the direction vertical with piston rod into
Lineal layout, has the one side of magnetic resistance sensor close to piston rod, and its array spacings direction and the ceramic cylinder rod direction of motion
Unanimously.
6. absolute type ceramic cylinder rod displacement sensor according to claim 1, it is characterised in that：Range ability is from tens
Millimeter is to tens meters.
7. a kind of measuring method using absolute type ceramic cylinder rod displacement sensor, by the coding containing absolute location information,
Expressed by the processing of cutting on the piston rod, and using the strong and weak change of magnetic resistance sensor array module induced field, and
Export sine and cosine waveform, the accurate displacement and absolute position values for measuring piston rod.
8. the measuring method according to claim 7 using absolute type ceramic cylinder rod displacement sensor, it is characterised in that：
The setting digit absolute position encoder of the binary number arrangement form is by the way of rolling generates at random, minimum movement interval
For unit binary number length；Detecting head reads the binary coding of setting digit, and first place moves into a bit, and end is moved
Going out a bit, form the binary coding of new setting digit, the binary coding corresponds to absolute position at this time,
Counter motion is similarly.
9. the measuring method according to claim 7 using absolute type ceramic cylinder rod displacement sensor, it is characterised in that：
During detecting head obtains absolute location information, while can be electronic fine-grained to absolute position progress, to obtain unit two
The precision of a quarter of system number length.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711350961.5A CN107906077A (en) | 2017-12-15 | 2017-12-15 | A kind of absolute type ceramic cylinder rod displacement sensor and its measuring method |
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| CN201711350961.5A CN107906077A (en) | 2017-12-15 | 2017-12-15 | A kind of absolute type ceramic cylinder rod displacement sensor and its measuring method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111046691A (en) * | 2019-11-20 | 2020-04-21 | 常州武宏机械科技有限公司 | One-dimensional code optical positioning device and method based on different depth groove formation |
| CN112431820A (en) * | 2020-12-03 | 2021-03-02 | 江苏恒立液压股份有限公司 | Absolute position displacement measuring system and measuring method of ceramic piston rod with groove |
| CN112525230A (en) * | 2020-12-07 | 2021-03-19 | 成都恒感科技有限公司 | Non-contact coding sensor for grouped sliding door |
| WO2022205648A1 (en) * | 2021-03-31 | 2022-10-06 | 三一汽车制造有限公司 | Hydraulic cylinder and operation machine |
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| CN2859104Y (en) * | 2005-05-12 | 2007-01-17 | 钱兵 | Hot spraying ceramic coating cylinder rod |
| CN201059302Y (en) * | 2007-02-09 | 2008-05-14 | 江苏武进液压启闭机有限公司 | Ceramic piston-rod of hydraulic cylinder having built-in stroke detecting apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111046691A (en) * | 2019-11-20 | 2020-04-21 | 常州武宏机械科技有限公司 | One-dimensional code optical positioning device and method based on different depth groove formation |
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| CN112431820A (en) * | 2020-12-03 | 2021-03-02 | 江苏恒立液压股份有限公司 | Absolute position displacement measuring system and measuring method of ceramic piston rod with groove |
| CN112525230A (en) * | 2020-12-07 | 2021-03-19 | 成都恒感科技有限公司 | Non-contact coding sensor for grouped sliding door |
| WO2022205648A1 (en) * | 2021-03-31 | 2022-10-06 | 三一汽车制造有限公司 | Hydraulic cylinder and operation machine |
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