CN204461338U - Based on the high precision Linear displacement detection device of magnetic induction sensor - Google Patents
Based on the high precision Linear displacement detection device of magnetic induction sensor Download PDFInfo
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- CN204461338U CN204461338U CN201520139559.2U CN201520139559U CN204461338U CN 204461338 U CN204461338 U CN 204461338U CN 201520139559 U CN201520139559 U CN 201520139559U CN 204461338 U CN204461338 U CN 204461338U
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Abstract
The utility model discloses a kind of high precision Linear displacement detection device based on magnetic induction sensor, comprise the first structure and the second structural magnetostatic grid source and quiet magnetic railings ruler that are individually fixed in and there is relative displacement function, described magnetostatic grid source and quiet magnetic railings ruler are oppositely arranged, described magnetostatic grid source is provided with permanent magnet, described quiet magnetic railings ruler is provided with multiple magnetic induction part of responding to mutually with permanent magnet and is separated with a segment distance between magnetic induction part and permanent magnet, and described quiet magnetic railings ruler is connected with computing machine.The utility model have easy for installation, high precision, high stability, high reliability, long service life, delicate structure, environmental suitability strong, isolate explosion-proof feature, linear displacement detecting field can be widely used in.
Description
Technical field
The utility model relates to linear displacement detecting field, particularly relates to a kind of high precision Linear displacement detection device based on magnetic induction sensor.
Background technology
Application
Machine-building application brief introduction
Linear displacement transducer is widely used in measurement products size and mechanical motion displacement at machine industry, there are these displacement transducers just, can catch accurately and reliably tested length and positional information and change, all be tested accurately and control to realize.
Petroleum application brief introduction
Petroleum chemical industry, not only applies the sensors such as a large amount of flows, pressure, temperature, also applies a large amount of linear displacement transducers.The displacement of linear displacement transducer energy measurement mechanical, the position of hydraulic cylinder piston and cylinder piston, can also measure pressure vessels for the chemical industry, oil tank level.
Traffic application brief introduction
Apply high-precision linear displacement transducer, for roll out steel rail provides automatic measurement utensil.In the process of track train operation, applicable line displacement transducer accurately can locate the anchor point of train.Ship-boiler water level on boats and ships detects, fuel level detects, biloge water detects and special boats and ships such as the oil level detection of the ullage remote measurement of bulk chemicals cargo ship and overflow control, oil carrier and overflow control etc. all need to apply displacement transducer.At aircraft industry, also apply multiple displacement transducer, as aircraft fuel level is measured, wing angle and position measurement, landing gear position measurement etc.
Water conservancy and hydropower application brief introduction
Water conservancy and hydropower industry gate, in order to adjust flux, controls upstream and downstream water level, flood of releasing, gets rid of silt or floating thing etc.Gatage size is one of critical data of Automatic controlling of strobe, the large young pathbreaker of gatage directly affects allotment and the metering of water resource, its gate stroke is obtained by linear displacement transducer measurement, and metering system has measurement oil cylinder stroke be converted to the indirect measure of gate stroke and directly measure gate stroke etc.Displacement transducer installation form has oil cylinder built-in type, oil cylinder external, gate door along arrangement and support arm indirect inspection mounting means etc.
The various technical products in current high precision linear displacement detecting field and installation method
(1) grating scale displacement transducer and mounting structure
Grating scale displacement transducer is often applied to lathe and the aspect such as Modern Machining Center and surveying instrument, can be used as the measurement of straight-line displacement or angular displacement.It exports measuring-signal is digit pulse.Be usually used in detecting the coordinate of cutter and workpiece in numerically-controlled machine, observe and follow the tracks of tool track, to complete the object by the automatic accurately editing objective workpiece of detail of design, be usually used in CNC milling machine, numerically controlled lathe and CNC numerical control machining center.
Grating scale is made up of scale grating and grating reading head two parts.Scale grating is generally fixed on a movable element, and grating reading head is arranged on fixed part, and indication grating is fitted in grating reading head.Mounting structure is see Fig. 1, Fig. 2 and Fig. 3 on milling machine for grating scale displacement transducer, and wherein, Fig. 1 is milling machine front elevation, and Fig. 2 is milling machine side view, and Fig. 3 is the partial enlarged drawing that grating is arranged on worktable.Milling machine table is all removable at x, y, z direction of principal axis, therefore on x, y, z direction of principal axis, displacement detecting grating chi is all housed.Scale grating 4 (three direction of principal axis respectively have a scale) is fixed on worktable 5 or moving guide rail, and grating reading head 3 is fixed on the immovable guide rail bearing 2 of relative scale grating.Mobile in x-axis for worktable 5, worktable 5 is above guide rail bearing 2, moved by screw mandrel, make scale grating 4 and grating reading head 3 also relative movement, thus grating reading head 3 is resolved and obtained the displacement of worktable 5, this displacement shows and participates in worktable 5 and controls at x-axis top offset on grating control instrument 8.The displacement of same y-axis and z-axis is also resolve respectively by the grating scale in y-axis and z-axis direction to obtain.Using the displacement obtained as the reasonable cutting output of the basic just energy automatic governing of control to process high-precision part.
(2) ultrasound wave, radar level sensor and mounting structure
Ultrasonic sensor is the sensor utilizing hyperacoustic characteristic to develop.Ultrasonic pulse is propagated with acoustic velocity, receives ultrasonic pulse required time interval be directly proportional from being transmitted into the distance of transducer to measured medium surface.Radar level sensor is extremely similar to the principle of work of ultrasonic sensor.Ultrasound wave, radar level sensor are usually used in various atmospheric storage tank, small-sized storage tank and small containers, pump lifting station, waste water storage tank etc.
For normal pressure oil tank, detect the height of oil level by ultrasound wave, radar level sensor, Fig. 4 is the front view of large-scale storage tank, and ultrasound wave, radar level sensor 13 are installed on the top of large-scale storage tank 11, and detector is installed perpendicular to tank bottom.By ultrasound wave, radar level sensor output signal access Displaying Meter, the height of oil level just accurately can be known.
(3) magneto strictive sensor and mounting structure
The electronic room of magnetostrictive displacement sensor is relative with waveguide fixing, unit under test drives the magnet ring be sleeved on waveguide to move, measuring process produces ultrasonic pulse in the electronic room by sensor, this ultrasonic pulse presses fixed speed transmission in waveguide, when this pulsed beam is crossing with magnetic field, waveguide produces local magnetostrictive effect, a branch of strain mechanical wave pulse signal passback electronic room, because the transmission time of this strain mechanical wave pulse signal in waveguide and movable magnet ring are directly proportional to the distance between electronic room, pass through Measuring Time, just highly precisely can determine the distance of magnet ring and electronic room.Magnetostrictive displacement sensor is applied to the displacement measurements such as hydraulic jack, cylinder, gate, engineering machinery, liquid level.
Fig. 5 is the built-in installation oil cylinder structure of hydraulic figure of magnetostrictive displacement sensor, and magnetostrictive displacement sensor is divided into induction ruler 16 and annular magnetic steel 15 to form.It is inner that induction ruler 16 sealing is arranged on cylinder block 14, and annular magnetic steel 15 is arranged on oil cylinder piston, and annular magnetic steel 15 is set on induction ruler 16.When oil cylinder piston 17 moves, annular magnetic steel 15 can be driven to move, annular magnetic steel 15 and induction ruler 16 relative motion, by magnetostriction principle of induction, will parse the moving displacement of oil cylinder piston 17.
What the current Application comparison of high precision linear displacement transducer was many is exactly above three kinds, and also has other as inductance type high accuracy displacement sensor, condenser type high accuracy displacement sensor, resistance-type high accuracy displacement sensor, laser high-precision displacement transducer, LVDT differential transformer displace￣ ment transducer etc.Resistor type displacement sensor is contact displacement transducer, easily causes mechanical wear, and mechanical life is short, is not suitable for long use.Inductance type, condenser type and LVDT differential transformer transducer are non-contact type sensors, mechanical is worn and torn, but precision is not high when measuring on a large scale, be only suitable for measurement among a small circle, be not suitable for large-scale high-acruracy survey, and require higher to the frequency of excitation power supply and amplitude stability, be not suitable for high frequency kinetic measurement.
And although foregoing grating, magnetic grid displacement transducer can measure large-scale high-precision straight-line displacement, but it is higher to the request for utilization of environment, water vapor can not be used in and have the environment of water soaking, can not strenuous vibration, the place that corrosion is strong can not be used in.In addition, grating, magnetic grid displacement transducer use non-absolute encoding Cleaning Principle, and power down backward shift data cannot be preserved, and can cause data error, environment for use is limited.Ultrasound wave, radar shift sensor are in a large number for level gauging, and ultrasonic measurement has blind area, general 0.5 meter of blind area, and when measuring on a large scale, resolution, at grade, can not measure the micron-sized liquid level of high precision.Magnetostrictive displacement (liquid level) sensor is also that the method for operate time accurate metering measures high-precision displacement, when measuring the displacement of long range, because the longer meeting of range causes overall linear error larger, be only suitable for the range for less than three meters, and the range of more than three meters can cause measuring accuracy to decline because error is excessive.
Utility model content
The purpose of this utility model is the deficiency in order to overcome above-mentioned background technology, a kind of high precision Linear displacement detection device based on magnetic induction sensor is provided, have easy for installation, high precision, high stability, high reliability, long service life, delicate structure, environmental suitability strong, isolate explosion-proof feature.
A kind of high precision Linear displacement detection device based on magnetic induction sensor that the utility model provides, comprise the first structure and the second structural magnetostatic grid source and quiet magnetic railings ruler that are individually fixed in and there is relative displacement function, described magnetostatic grid source and quiet magnetic railings ruler are oppositely arranged, described magnetostatic grid source is provided with permanent magnet, described quiet magnetic railings ruler is provided with multiple magnetic induction part of responding to mutually with permanent magnet and is separated with a segment distance between magnetic induction part and permanent magnet, and described quiet magnetic railings ruler is connected with computing machine.
In technique scheme, described device adopts difference algorithm principle to carry out measuring the calculating of the relatively a certain basis displacement amount of object, and concrete formula is as follows: S=((a
1+ ... + a
n1)/n1+ (b
1+ ... + b
n2)/n2+ (c
1+ ... + c
n3)/n3+ (d
1+ ... + d
n4)/n4+ ... + (k
1+ ... + k
nk)/nk)/k*L, wherein, S is the displacement data based on the high precision Linear displacement detection device of magnetic induction sensor under different conditions, and k is the quantity of permanent magnet in magnetostatic grid source, n1, n2 ... nk is respectively the quantity of the magnetic induction part on quiet magnetic railings ruler corresponding to each permanent magnet induction, a
1, a
2a
n1represent that permanent magnet one responds to each corresponding magnetic induction part respectively, b
1, b
2b
n2represent that permanent magnet two responds to each corresponding magnetic induction part respectively, c
1, c
2c
n3represent that permanent magnet three responds to each corresponding magnetic induction part respectively, d
1, d
2d
n4represent that permanent magnet four responds to each corresponding magnetic induction part respectively ..., k
1, k
2k
nkrepresent each magnetic induction part that K permanent magnet induction is corresponding respectively, L is the distance between each magnetic induction part.
In technique scheme, k be greater than 1 natural number.
In technique scheme, described device adopts difference algorithm principle to carry out measuring the calculating of the relatively a certain basis displacement amount of object, and concrete formula is as follows: S=((a
1+ ... + a
n1)/n1+ (b
1+ ... + b
n2)/n2+ (c
1+ ... + c
n3)/n3)/3*L, wherein, S is the displacement data based on the high precision Linear displacement detection device of magnetic induction sensor under different conditions, k=3 shows that the quantity of permanent magnet in magnetostatic grid source is 3, n1, n2, n3 are respectively the quantity of the magnetic induction part on quiet magnetic railings ruler corresponding to each permanent magnet induction, a
1, a
2a
n1represent that permanent magnet one responds to each corresponding magnetic induction part respectively, b
1, b
2b
n2represent that permanent magnet two responds to each corresponding magnetic induction part respectively, c
1, c
2c
n3represent that permanent magnet three responds to each corresponding magnetic induction part respectively, L is the distance between each magnetic induction part.
In technique scheme, described first structure and the second structure are the workbench of movement and fixing track base respectively.
In technique scheme, described second structural plane and the first structural plane are square tube respectively and are located at the square tube guide groove at square tube top, and described quiet magnetic railings ruler is located in square tube, and described magnetostatic grid source to be located in square tube guide groove and to be slided with quiet magnetic railings ruler and is connected.
In technique scheme, described quiet magnetic railings ruler is one section of cylinder, described magnetic induction part is packaged in the quiet magnetic railings ruler of column type, and described magnetostatic grid source and permanent magnet are the annulus that ecto-entad is coaxially arranged, and the magnetostatic grid source of described circular ring type and permanent magnet are sheathed on quiet magnetic railings ruler.
In technique scheme, the length of described permanent magnet is greater than the distance L between magnetic induction part.
In technique scheme, the multiple magnetic induction parts in described quiet magnetic railings ruler are connected with computer acquisition end as parallel output unit.
In technique scheme, every eight magnetic induction parts are as a parallel output unit, and described quiet magnetic railings ruler is connected with computing machine by bus.
The utility model is based on the high precision Linear displacement detection device of magnetic induction sensor, there is following beneficial effect: the utility model is that the utility model of making based on magnetic induction sensor is created, have easy for installation, high precision, high stability, high reliability, long service life, delicate structure, environmental suitability strong, isolate the features such as explosion-proof, measurement range can from tens millimeters to tens meters, adapt to most evil bad industrial environment, comprise the fields such as undersea detection, industrial chemicals production, industry and urban sewage treatment, industrial crude production, machine-building.The utility model to overcome in prior art long range measurement products because of the larger linear error of range this shortcoming larger, in the range ability that it can be surveyed, its linear error can not increase with measurement range and increase, remain within accuracy requirement, accuracy class is at micron order, the straight-line displacement being applicable to multiple fields is measured, and usable range is wide.
Accompanying drawing explanation
Fig. 1 is the milling machine structure front elevation having installed existing grating scale displacement transducer;
Fig. 2 is the milling machine structure right view having installed existing grating scale displacement transducer;
Fig. 3 is the partial enlarged drawing of existing grating scale displacement transducer and installing component in Fig. 1;
Fig. 4 is the large-scale storage tank structural representation having installed existing ultrasound wave, radar level sensor;
Fig. 5 is the structural representation of the hydraulic jack having installed existing magneto strictive sensor;
Fig. 6 applies the milling machine partial structurtes enlarged diagram of the utility model based on the high precision Linear displacement detection device of magnetic induction sensor;
Fig. 7 applies the structural representation of the utility model based on the large-scale storage tank of the high precision Linear displacement detection device of magnetic induction sensor;
Fig. 8 applies the structural representation of the utility model based on the oil cylinder of the high precision Linear displacement detection device of magnetic induction sensor;
Fig. 9 is the structural representation of the utility model based on the high precision Linear displacement detection device of magnetic induction sensor;
Figure 10 is the structural representation of the utility model based on the difference algorithm principle example state one of the high precision Linear displacement detection device of magnetic induction sensor;
Figure 11 is the structural representation of the utility model based on the difference algorithm principle example state two of the high precision Linear displacement detection device of magnetic induction sensor;
Figure 12 is the structural representation of the utility model based on the difference algorithm principle example state three of the high precision Linear displacement detection device of magnetic induction sensor;
Figure 13 is the utility model based on the structural representation of state one in the magnetostatic grid source displacement resolving adopting single permanent magnet in the high precision Linear displacement detection device of magnetic induction sensor;
Figure 14 is the utility model based on the structural representation of state two in the magnetostatic grid source displacement resolving adopting single permanent magnet in the high precision Linear displacement detection device of magnetic induction sensor;
Figure 15 is the utility model based on the structural representation of state one in the magnetostatic grid source displacement resolving adopting multiple permanent magnet in the high precision Linear displacement detection device of magnetic induction sensor;
Figure 16 is the utility model based on the structural representation of state two in the magnetostatic grid source displacement resolving adopting multiple permanent magnet in the high precision Linear displacement detection device of magnetic induction sensor;
The structural front view of Figure 17 to be the utility model based on the high precision Linear displacement detection device of magnetic induction sensor adopt the first appearance forrns;
The structure left view of Figure 18 to be the utility model based on the high precision Linear displacement detection device of magnetic induction sensor adopt the first appearance forrns;
The structural front view of Figure 19 to be the utility model based on the high precision Linear displacement detection device of magnetic induction sensor adopt the second appearance forrns;
The structure left view of Figure 20 to be the utility model based on the high precision Linear displacement detection device of magnetic induction sensor adopt the second appearance forrns;
Figure 21 is the structural representation of the utility model based on state one in displacement interpretation process when permanent magnet length is equal with the spacing of adjacent magnetic induction part in the high precision Linear displacement detection device of magnetic induction sensor;
Figure 22 is the structural representation of the utility model based on state two in displacement interpretation process when permanent magnet length is equal with the spacing of adjacent magnetic induction part in the high precision Linear displacement detection device of magnetic induction sensor.
1-machine tool frame, 2-guide rail bearing, 3-grating read head, 4-scale grating, 5-worktable, 6-milling machine guide rail, 7-milling machine upright, 8-grating control instrument, the fuel-displaced valve of 9-, 10-liquid, 11-large-scale storage tank, 12-enters fuel tap door, 13-ultrasonic sensor, 14-cylinder block, 15-annular magnetic steel, 16-induction ruler, 17-oil cylinder piston, the magnetostatic grid source of 18-, the quiet magnetic railings ruler of 19-, 20-magnetic induction part, 21-permanent magnet, 22-square tube, 23-square tube guide groove.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, but this embodiment should not be construed as restriction of the present utility model.
Existing Linear displacement detection device is as shown in Figures 1 to 5 existing in the introduction to be described, and does not repeat them here.
See Fig. 6 to Fig. 9, the utility model is based on the high precision Linear displacement detection device of magnetic induction sensor, comprise the first structure and the second structural magnetostatic grid source 18 and quiet magnetic railings ruler 19 that are individually fixed in and there is relative displacement function, described magnetostatic grid source 18 and quiet magnetic railings ruler 19 are oppositely arranged, described magnetostatic grid source 18 is provided with permanent magnet 21, described quiet magnetic railings ruler 19 is provided with multiple magnetic induction part 20 responded to permanent magnet 21 phase, and be separated with a segment distance between magnetic induction part 20 and permanent magnet 21, described quiet magnetic railings ruler 19 is connected with computing machine (not shown) by bus.
See Figure 10 to Figure 12, described device adopts difference algorithm principle to carry out measuring the calculating of the relatively a certain basis displacement amount of object, and concrete formula is as follows:
S=((a
1+ ... + a
n1)/n1+ (b
1+ ... + b
n2)/n2+ (c
1+ ... + c
n3)/n3+ (d
1+ ... + d
n4)/n4+ ... + (k
1+ ... + k
nk)/nk)/k*L, wherein, S is the displacement data based on the high precision Linear displacement detection device of magnetic induction sensor under different conditions, k is the quantity of permanent magnet 21 in magnetostatic grid source 18, n1, n2 ... nk is respectively the quantity that each permanent magnet 21 responds to the magnetic induction part 20 on corresponding quiet magnetic railings ruler 19, a
1, a
2a
n1represent that permanent magnet 21 1 responds to each corresponding magnetic induction part 20, b respectively
1, b
2b
n2represent that permanent magnet 21 2 responds to each corresponding magnetic induction part 20, c respectively
1, c
2c
n3represent that permanent magnet 21 3 responds to each corresponding magnetic induction part 20, d respectively
1, d
2d
n4represent that permanent magnet 21 4 responds to each corresponding magnetic induction part 20 respectively ..., k
1, k
2k
nkrepresenting that K permanent magnet 21 responds to each corresponding magnetic induction part 20, L is respectively distance between each magnetic induction part 20.
See Figure 13 to Figure 16, in the present embodiment, k be greater than 1 natural number.
The concrete formula of optimum embodiment is as follows:
S=((a
1+ ... + a
n1)/n1+ (b
1+ ... + b
n2)/n2+ (c
1+ ... + c
n3)/n3)/3*L, wherein, S is the displacement data based on the high precision Linear displacement detection device of magnetic induction sensor under different conditions, k=3 shows that the quantity of permanent magnet 21 in magnetostatic grid source 18 is 3, n1, n2, n3 are respectively the quantity that each permanent magnet 21 responds to the magnetic induction part 20 on corresponding quiet magnetic railings ruler 19, a
1, a
2a
n1represent that permanent magnet 21 1 responds to each corresponding magnetic induction part 20, b respectively
1, b
2b
n2represent that permanent magnet 21 2 responds to each corresponding magnetic induction part 20, c respectively
1, c
2c
n3represent that each magnetic induction part 20, L of permanent magnet 21 3 induction correspondence is the distance between each magnetic induction part 20 respectively.
Described first structure and the second structure are the workbench 5 of movement and fixing track base 2 respectively.
See Figure 17 to Figure 18, described second structural plane and the first structural plane are square tube 22 and the square tube guide groove 23 being located at square tube 22 top respectively, described quiet magnetic railings ruler 19 is located in square tube 22, and described magnetostatic grid source 18 to be located in square tube guide groove 23 and to be slided with quiet magnetic railings ruler 19 and is connected.
See Figure 19 to Figure 20, described quiet magnetic railings ruler 19 is one section of cylinder, described magnetic induction part 20 is packaged in the quiet magnetic railings ruler 19 of column type, described magnetostatic grid source 18 and permanent magnet 21 are the annulus that ecto-entad is coaxially arranged, and the magnetostatic grid source 18 of described circular ring type and permanent magnet 21 are sheathed on quiet magnetic railings ruler 19.
The length of described permanent magnet 21 is greater than the distance L between magnetic induction part 20.
Multiple magnetic induction parts 20 in described quiet magnetic railings ruler 19 are connected with computer acquisition end as parallel output unit.
Every eight magnetic induction parts 20 as a parallel output unit.
The purpose of this utility model is the deficiency in order to overcome above-mentioned background technology, based on the utilization of magnetic induction sensor, have easy for installation, high precision, high stability, high reliability, long service life, delicate structure, environmental suitability strong, isolate the features such as explosion-proof, measurement range can from tens millimeters to tens meters, adapt to most evil bad industrial environment, comprise the fields such as undersea detection, industrial chemicals production, industry and urban sewage treatment, industrial crude production, machine-building.The utility model to overcome in prior art long range measurement products because of the larger linear error of range this shortcoming larger, in the range ability that it can be surveyed, its linear error can not increase with measurement range and increase, remain within accuracy requirement, accuracy class is at micron order, the straight-line displacement being applicable to multiple fields is measured, and usable range is wide.
Embody rule
By introducing the example of several application, contrast with aforesaid existing displacement detector, open the utility model is applied to technical scheme on these examples and effect.
Fig. 6 is the installation diagram that the utility model is applied to milling machine workbench displacement measurement in mechanical manufacturing field, magnetostatic grid source 18 is installed on the worktable 5 of movement, quiet magnetic railings ruler 19 is installed on track base 2, worktable 5 drives magnetostatic grid source 18 to move, quiet magnetic railings ruler 19 is resolved displacement and is directly outputted to grating control instrument 8, controls and regulate the movement of milling machine table 5.
Fig. 7 is the level gauging that the utility model is applied to industrial chemicals, oil plant tank storage is deposited, quiet magnetic railings ruler 19 (pipe form) is lifted on large-scale storage tank 11 top, magnetostatic grid source 18 (float) is sleeved on quiet magnetic railings ruler 19 shell, magnetostatic grid source 18 swims in liquid 10 surface, when the liquid 10 in large-scale storage tank 11 increases or reduces, the height in magnetostatic grid source 18 also increases or reduces, and quiet magnetic railings ruler 19 parses the height of liquid level.
Fig. 8 is the detection that the utility model is applied to the small-sized oil cylinder displacement stroke such as water conservancy and hydropower, machinery, oil cylinder inside is installed in quiet magnetic railings ruler 19 and magnetostatic grid source 18, quiet magnetic railings ruler 19 is fixedly mounted on cylinder block 14, magnetostatic grid source 18 is arranged on oil cylinder piston 17, when oil cylinder piston 17 moves, magnetostatic grid source 18 is also and then mobile, and quiet magnetic railings ruler 19 will resolve the displacement obtaining oil cylinder piston 17, and control system is exported in displacement.
Principle of work of the present utility model and algorithm are described below:
Measuring principle of the present utility model is the absolute position according to the permanent magnet 21 in the magnetostatic grid source 18 of magnetic induction part 20 sensed activity in quiet magnetic railings ruler 19, and is resolved the actual displacement value of detected product by algorithm.Magnetic induction part 20 can adopt Various Components, has hall device, Magnetic sensitive films, huge magnetic device, huge magnetic device etc.
See Fig. 9, magnetostatic grid source 18 is arranged on directly over quiet magnetic railings ruler 19, magnetostatic grid source 18 is 0 millimeter to 10 millimeters with the clearance distance scope of quiet magnetic railings ruler 19, there is magnetic induction part 20 quiet magnetic railings ruler 19 inside, it is inner that magnetic induction part 20 equidistant (L=6mm) is distributed in quiet magnetic railings ruler 19, when permanent magnet 21 enters the detection-sensitive distance of magnetic induction part 20, sense that the data collected are converted to voltage signal and flow to processor (not shown) by the magnetic induction part 20 in magnetic field, carry magnetic induction part 20 sequence number of signal (as N1 under processor for recording, N2), and the exact position in magnetostatic grid source 18 is obtained by difference algorithm.
As seen from Figure 9, aforesaid difference algorithm principle formula can be reduced to: N1=11, N2=12 in S=(N1+N2)/2*L, figure, so S=(11+12)/2*6=69, unit is mm, therefore the displacement in magnetostatic grid source is 69mm.
Magnetostatic grid calculate ratio juris see Figure 10, Figure 11 and Figure 12, and they are respectively three states of magnetostatic grid source 18 at magnetic induction part 20 diverse location, illustrate the principle of magnetostatic grid difference algorithm by these three states.
As seen from Figure 10, magnetic induction part 20 sequence number sensing magnetic field in state one is N1=1, N2=2, N3=3, and N1, N2 are responded to by same permanent magnet 21, therefore computing formula is S=((N1+N2)/2+N3)/2*L, therefore S=((1+2)/2+3)/2*6=13.5, the displacement in magnetostatic grid source 18 is 13.5mm.
As seen from Figure 11, sense in state two that magnetic induction part 20 sequence number in magnetic field is N1=2, N2=3, therefore computing formula is S=(N1+N2)/2*L, therefore S=(2+3)/2*6=15, the displacement in magnetostatic grid source 18 is 15mm.
As seen from Figure 12, magnetic induction part 20 sequence number sensing magnetic field in state three is N1=2, N2=3, N3=4, and N2, N3 are responded to by same permanent magnet, therefore computing formula is S=((N2+N3)/2+N1)/2*L, therefore S=((3+4)/2+2)/2*6=16.5, the displacement in magnetostatic grid source 18 is 16.5mm.
The utility model innovation structurally
Quiet magnetic railings ruler 19 is distributed on circuit boards by multiple magnetic induction part 20 equidistant (L=6mm) and is encapsulated in aluminum alloy square tube 22 shell of band square tube guide groove 23, and 18, magnetostatic grid source is made up of with aluminium alloy square one or more equidistant permanent magnet 21.Resolve for reaching high-precision displacement, the utility model has carried out the innovation of following 2.
One, multi-set parallel collection
At the circuit part of quiet magnetic railings ruler 19, multiple magnetic induction part 20, gathers the collection terminal of data parallel input processor the collection circuit on minimizing circuit board and response time by parallel output unit as parallel output unit (such as every unit comprises eight magnetic induction parts 20).Multi-set parallel collection is exactly that multiple permanent magnet 21 acts on directly over magnetic induction part 20, and the magnetic induction part 20 that same permanent magnet 21 acts on is one group, and acquisition is organized sensed data by collection terminal more.Permanent magnet 21 number by determine induction obtain data group number, also will determine that quiet magnetic railings ruler 19 resolves the precision of displacement simultaneously.According to difference algorithm principle of the present utility model, when Figure 13 to Figure 16 illustrates one group and three groups of parallel acquisitions, quiet magnetic railings ruler 19 resolves the difference of displacement accuracy.Be exactly the example of two groups of parallel acquisitions in the introduction of aforementioned algorism principle, parsing precision is 1.5mm, will repeat no more here.From Figure 13 to Figure 14, when gathering with one group, permanent magnet 21 acts on magnetic induction part 20 two states, and the sequence number of state one or two magnetic induction part 20 in active region is 1,2, and according to algorithm principle S=(1+2)/2*6=9, displacement is 9mm.State two is for only having a magnetic induction part 20 in active region, and sequence number is 2, S=2*6=12, and displacement is 12mm.The displacement in magnetostatic grid source 18 of going down so is by that analogy respectively 15mm, 18mm, 21mm ..., therefore one group of parsing precision 3mm gathered.From Figure 15 to Figure 16, also divide two states during three groups of collections, in state one, the sequence number of magnetic induction part 20 in active region is 1,2,3,4,5, and 1 and 2 one group, 3 one groups, 4 and 5 one groups, according to algorithm principle S=((1+2)/2+3+ (4+5)/2)/3*6=18, magnetostatic grid source 18 displacement is 18mm.2 are respectively at the sequence number of active region, 3,4 by state two magnetic induction part 20,5, and 2 independent one group, 3 independent one group, 4 and 5 totally one group, according to algorithm principle S=, ((2+3+ (4+5)/2)/3*6=19, magnetostatic grid source 18 displacement is 19mm.Displacement of going down so is by that analogy 20,21,22mm ..., the parsing precision of therefore three groups of collections is 1mm.
As can be seen here, in the method that multi-set parallel gathers, the precision of group number more parsings displacement will be higher, and this is first feature of the utility model structure.
Two, permanent magnet reach is with the large minispread such as non-of spacing between sensing element
Be be equally spaced between magnetic induction part 20 in quiet magnetic railings ruler 19, be also equally spaced between multiple permanent magnets 21 in magnetostatic grid source 18, but between permanent magnet 21 reach and magnetic induction part 20, spacing is the large minispread such as non-.Under the prerequisite that permanent magnet 21 quantity is equal, permanent magnet 21 reach also can affect quiet magnetic railings ruler 19 with the large minispread of the non-grade of spacing between magnetic induction part 20 and resolve displacement accuracy.
Below for illustrating, in algorithm principle illustrates, permanent magnet 21 reach is large minispread such as non-grade with spacing between magnetic induction part 20, and permanent magnet 21 reach is greater than the spacing between magnetic induction part 20, and it resolves precision is 1.5mm.In figure, permanent magnet 21 reach equals the spacing between magnetic induction part 20, from Figure 21 to Figure 22, in state one, magnetic induction part 20 is respectively 1 and 3 at the sequence number of active region, and according to algorithm principle S=(1+3)/2*6=12, magnetostatic grid source 18 displacement is 12mm.In state two, magnetic induction part 20 is respectively 2 and 3 at the sequence number of active region, and according to algorithm principle S=(2+3)/2*6=15, magnetostatic grid source 18 displacement is 15mm.Be 18mm, 21mm, 24mm according to the displacement that state one and two is analogized down ..., therefore resolve precision 3mm.As can be seen here, under the prerequisite that spacing is identical between magnetic induction part 20, if permanent magnet 21 reach is greater than spacing between magnetic induction part 20, parsing precision is higher.This is also another feature of the present utility model.
Adopt multi-set parallel collection and permanent magnet 21 reach with the design feature of the large minispreads such as spacing between sensing element is non-, improve the utility model displacement and resolve precision.
Its structure of the utility model is made up of a quiet magnetic railings ruler 19 and a magnetostatic grid source 18, its appearance forrns can comprise following two kinds: one, as Figure 17 to Figure 18, the electric processing section of quiet magnetic railings ruler 19 and magnetic induction part 20 are encapsulated in be with in aluminum alloy square tube 22 shell of square tube guide groove 23, the length of aluminum alloy square tube 22 and the suitable of measurement range, magnetostatic grid source 18 forms with aluminium alloy square by organizing permanent magnet 21 more, permanent magnet 21 is arranged in aluminium alloy square, magnetostatic grid source 18 is arranged in aluminum alloy square tube guide groove 23, if magnetostatic grid source 18 is moved, quiet magnetic railings ruler 19 just can resolve displacement, two, as Figure 19 to Figure 20, electric processing section and magnetic induction part 20 encapsulate in stainless pipe shell, length and the range of stainless pipe are suitable, magnetostatic grid source 18 is made up of with stainless pipe multiple annular permanent magnet 21, permanent magnet 21 is in stainless pipe, and magnetostatic grid source 18 cover is embedded on stainless pipe.According to different environment and technical requirement, can select multi-form structure, stainless steel structure accommodative ability of environment is strong.The shell of different materials, the environment of adaptation is also different, and aluminum alloy materials is used in medium or oligosaprobic place, and stainless steel material is then used in the place of high pollution or severe contamination.
Principal feature of the present utility model
1, magnet-sensitive element adopts non-contact measurement, and long service life, high stability, reliability are high.
2, version variation, measurement range is wide, can be competent at from tens millimeters to tens meters, and I&M is convenient, and assembling form is various, the compact exquisiteness of appearance forrns.
3, external form material variation, different environment can select different external form materials, and accommodative ability of environment is strong, corrosion-resistant, high pressure resistant, high, the waterproof and dustproof of IP protection, shockproof.
4, good seal performance, can use, can be positioned in the liquid of pressure-bearing, in confined gas container in the liquid such as shallow water, deep water, chemical industry, oil plant.
5, highly sensitive, reproducible, high linearity, fast response time can reach Millisecond, and precision is high, and output accuracy can reach 1mm, and resolution can reach 0.5mm.
6, adapt to multiple direct supply, voltage all can adapt to from 5V to 40V.Multiple output interface mode is available: RS485, RS422, SSI, CAN, Modbus, TCP/IP, analog quantity 4-20mA, analog quantity 1-10V etc.User can be facilitated to access PC, PLC, also facilitate user to access all kinds of instrument.
7, antijamming capability is strong, not by the impact of various electromagnetic interference (EMI).Can anti-lightning strike and electrostatic.
8, low excursion with temperature, has wider operating temperature range-25 DEG C ~ 85 DEG C, meets army's mark (-55 DEG C ~ 125 DEG C) working temperature, and low in energy consumption, and supply current is less than 30mA.
9, cost performance is high, noncontacting measurement, and absolute value exports, and powers on and namely obtains absolute position, even if power interruption, reclosing, data also can not be lost, and need not again make zero.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
The content be not described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.
Claims (7)
1. the high precision Linear displacement detection device based on magnetic induction sensor, it is characterized in that: comprise the first structure and the second structural magnetostatic grid source (18) and quiet magnetic railings ruler (19) that are individually fixed in and there is relative displacement function, described magnetostatic grid source (18) and quiet magnetic railings ruler (19) are oppositely arranged, described magnetostatic grid source (18) is provided with permanent magnet (21), described quiet magnetic railings ruler (19) is provided with multiple magnetic induction part (20) responded to mutually with permanent magnet (21), and be separated with a segment distance between magnetic induction part (20) and permanent magnet (21), described quiet magnetic railings ruler (19) is connected with computing machine.
2. the high precision Linear displacement detection device based on magnetic induction sensor according to claim 1, is characterized in that: described first structure and the second structure are the workbench (5) of movement and fixing track base (2) respectively.
3. the high precision Linear displacement detection device based on magnetic induction sensor according to claim 1, it is characterized in that: described second structural plane and the first structural plane are square tube (22) and the square tube guide groove (23) being located at square tube (22) top respectively, described quiet magnetic railings ruler (19) is located in square tube (22), and described magnetostatic grid source (18) to be located in square tube guide groove (23) and to be slided with quiet magnetic railings ruler (19) and is connected.
4. the high precision Linear displacement detection device based on magnetic induction sensor according to claim 1, it is characterized in that: described quiet magnetic railings ruler (19) is one section of cylinder, described magnetic induction part (20) is packaged in the quiet magnetic railings ruler (19) of column type, described magnetostatic grid source (18) and permanent magnet (21) are the annulus that ecto-entad is coaxially arranged, and the magnetostatic grid source (18) of described circular ring type and permanent magnet (21) are sheathed on quiet magnetic railings ruler (19).
5. the high precision Linear displacement detection device based on magnetic induction sensor according to any one of claim 1 to 4, is characterized in that: the length of described permanent magnet (21) is greater than the distance L between magnetic induction part (20).
6. the high precision Linear displacement detection device based on magnetic induction sensor according to any one of claim 1 to 4, is characterized in that: the multiple magnetic induction parts (20) in described quiet magnetic railings ruler (19) are connected with computer acquisition end as parallel output unit.
7. the high precision Linear displacement detection device based on magnetic induction sensor according to claim 6, it is characterized in that: every eight magnetic induction parts (20) are as a parallel output unit, and described quiet magnetic railings ruler (19) is connected with computing machine by bus.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697428A (en) * | 2015-03-11 | 2015-06-10 | 武汉静磁栅机电制造有限公司 | Linear displacement detection device with high precision based on magnetic induction sensor |
| CN105547124A (en) * | 2016-01-15 | 2016-05-04 | 中国工程物理研究院材料研究所 | Device and method for measuring displacement of object in paramagnetic box based on magnetic mark |
| CN107152904A (en) * | 2016-03-02 | 2017-09-12 | 深圳市祈飞科技有限公司 | A kind of magnetic railings ruler digital readout system |
| CN109790680A (en) * | 2016-09-26 | 2019-05-21 | 挪威国立奥伊威尔瓦克有限公司 | Fiber rope and lifting system comprising same |
| CN110617758A (en) * | 2019-08-27 | 2019-12-27 | 骏材（深圳）科技工程有限公司 | Precision detection machine of magnetic grid ruler and precision detection method thereof |
| CN112594319A (en) * | 2020-12-11 | 2021-04-02 | 中铁桥研科技有限公司 | Viscous damper with magnetic grid positioning device and displacement calculation method thereof |
| CN117722957A (en) * | 2023-11-22 | 2024-03-19 | 广州市南沙区北科光子感知技术研究院 | Magnetic grating type fiber bragg grating wide-range displacement sensor |
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- 2015-03-11 CN CN201520139559.2U patent/CN204461338U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697428A (en) * | 2015-03-11 | 2015-06-10 | 武汉静磁栅机电制造有限公司 | Linear displacement detection device with high precision based on magnetic induction sensor |
| CN104697428B (en) * | 2015-03-11 | 2017-05-17 | 武汉静磁栅机电制造有限公司 | Linear displacement detection device with high precision based on magnetic induction sensor |
| CN105547124A (en) * | 2016-01-15 | 2016-05-04 | 中国工程物理研究院材料研究所 | Device and method for measuring displacement of object in paramagnetic box based on magnetic mark |
| CN105547124B (en) * | 2016-01-15 | 2018-02-02 | 中国工程物理研究院材料研究所 | Ohject displacement measurement apparatus and its measuring method in paramagnetic case based on magnetic mark |
| CN107152904A (en) * | 2016-03-02 | 2017-09-12 | 深圳市祈飞科技有限公司 | A kind of magnetic railings ruler digital readout system |
| CN109790680A (en) * | 2016-09-26 | 2019-05-21 | 挪威国立奥伊威尔瓦克有限公司 | Fiber rope and lifting system comprising same |
| CN110617758A (en) * | 2019-08-27 | 2019-12-27 | 骏材（深圳）科技工程有限公司 | Precision detection machine of magnetic grid ruler and precision detection method thereof |
| CN112594319A (en) * | 2020-12-11 | 2021-04-02 | 中铁桥研科技有限公司 | Viscous damper with magnetic grid positioning device and displacement calculation method thereof |
| CN117722957A (en) * | 2023-11-22 | 2024-03-19 | 广州市南沙区北科光子感知技术研究院 | Magnetic grating type fiber bragg grating wide-range displacement sensor |
| CN117722957B (en) * | 2023-11-22 | 2024-06-04 | 广州市南沙区北科光子感知技术研究院 | A magnetic grating fiber Bragg grating large-range displacement sensor |
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