CN102102985B - Arbitrarily triangular sensor and calibration method thereof - Google Patents

Abstract

The invention discloses an arbitrarily triangular sensor and a calibration method thereof. The arbitrarily triangular sensor comprises a sensor connector block, a sensor, an adaptor, a measuring rod and a probe, wherein the sensor is arranged on the sensor connector block; the adaptor is pivoted on the sensor connector block through a rotary centre; the measuring rod is arranged on one end of the adaptor, the probe is arranged on one end away from the adaptor; the other end of the adaptor is contacted with the sensor contact; and the line connecting the rotary centre and the sensor contact centre is parallel to the measuring rod and above the measuring rod. The calibration method comprises: mounting the sensor, computing a group of variables H corresponding to the centre of the probe, obtaining a group of calibration values, substituting the calibrated parameter values into a program and re-measuring, verifying the accuracy of the measurement, and eliminating the installation errors. The arbitrarily triangular sensor and the calibration method thereof reduce requirements on installation and debugging of the sensor and make operation simpler and more convenient.

Description

A kind of arbitrary triangle sensor and method of calibration thereof

Technical field

The present invention relates to a kind of sensor and method of calibration thereof.

Background technology

Traditional contourgraph measurement mechanism in the installation process of sensor 6 and measuring staff 3, has proposed high requirement to the installation of sensor 6.As shown in Figure 1; Need to guarantee that gauge head 1 center, the centre of gyration 5 of measuring staff 3, sensor contact 7 centers are on same straight line at these 3; And require measuring staff 3 to be parallel to the marble work top, and because of the sight alignment structure comparatively difficulty is installed, be difficult to guarantee to realize this specific (special) requirements of sight alignment; On the other hand, its ergometry is bigger, easily measuring workpieces is caused to measure to scratch; Simultaneously, when changing measuring staff 3, need again clamping to guarantee sight alignment, operation inconvenience.In the existing measurement scheme of tradition, it is a kind of linear relationship that the variable quantity H at gauge head 1 center and sensor contact 7 change numerical value Δ Data, its value and the long L of measuring staff ₁, the centre of gyration 5 to sensor contact 7 centers distance L ₃And sensor coefficient is relevant, and relational expression is H=L ₁/ L ₃* C* Δ Data.Can find out from formula, in this scheme, also propose high requirement for installation accuracy, otherwise L ₁And L ₃Error amount can influence greatly measuring accuracy.

Simultaneously, traditional measurement all has certain restriction to the length of measuring workpieces and the height of measuring workpieces, guarantee that its sensor connector piece 8 lower edges can not touch the workpiece upper edge.In the existing sensor construction, because gauge head 1 center ratio sensor joint piece 8 height, higher when longer when measuring workpieces, when sensor moved with guide rail, sensor connector piece 8 lower edges may interfere with the highest face of worker, influence workpiece calibration.

Summary of the invention

The object of the invention provides a kind of arbitrary triangle sensor and method of calibration thereof, to overcome the technical matters of existing contourgraph sensor difficult installation, unreasonable structure.

Technical scheme of the present invention is:

A kind of arbitrary triangle sensor, comprise the sensor connector piece, be installed in sensor on the sensor connector piece, through the centre of gyration be hinged on adapter on the sensor connector piece, be arranged on the first end of switching measuring staff, be arranged on the chaining pin of measuring staff away from an end of adapter; The other end of said adapter contacts with sensor contact; Its special character is: the line at the said centre of gyration and sensor contact center is parallel with measuring staff and be positioned at the top of measuring staff.

The sensor joint piece bottom surface is parallel with surface level and be positioned at the top of measuring staff.

Above-mentioned measuring staff is a plurality of replaceable measuring staffs that are uneven in length.

A kind of method of calibration of arbitrary triangle sensor, its special character is that it comprises following steps:

1) sensor installation: during sensor installation, earlier measuring staff is parallel to work top, adjustment sensor contact center, until sensor reading in median location, then during this position the sensor contact center and the centre of gyration at same straight line;

2) prepare the slip gauge of at least four kinds of differing heights, and be close on the work top, its height theoretical value is one group of numerical value H _Reason

3) measure the height value that this chunk is advised respectively with sensor, measured value is one group of variation delta Data of sensor contact, with the long L of measuring staff ₁, the centre of gyration to gauge head center vertical range L ₂, the centre of gyration to sensor contact center L ₃And sensor coefficient C substitution formula:

$H=L_2-L_1*C*\mathrm{\&Delta;Data}/L_3-L_2*\sqrt{{{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="H2009102195658E00011.png"\; state="\{\{state\}\}">L</figure-callout>}}_3}^2-{(\mathrm{\&Delta;Data}*C)}^2)}/{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="H2009102195658E00011.png"\; state="\{\{state\}\}">L</figure-callout>}}_3,$

Can draw one group of corresponding variable quantity H of gauge head center;

4) compare gauge head center variable quantity H and rule theoretical value H highly _Reason, according to the formula of step 3), utilize optimized calculation method to iterate, make H infinitely approach H _ReasonThereby draw L ₁, L ₂, L ₃And one group of calibration value of C;

5) the parameter value substitution program that calibrates is remeasured, the accuracy of confirmatory measurement is eliminated alignment error; If accuracy is relatively poor, then repeating step 3) and step 4) demarcate each parameter again.

The height value of above-mentioned slip gauge is seven to nine kinds.

Technique effect of the present invention is:

1, the present invention has reduced the Installation and Debugging requirement of sensing, operates easier.The installation needs that no longer need sight alignment only need make sensor contact center and centre of gyration place straight line parallel in measuring staff and be positioned at above the measuring staff when mounted, only require that with this understanding measuring staff is parallel to work top and gets final product work.

2, the present invention has increased the range of size of measuring workpieces.The present invention is parallel with surface level and be positioned at the top of measuring staff with the bottom surface of sensor connector piece; It is a lot of to make the bottom surface of sensor connector piece exceed plane, place, gauge head center; Can guarantee in measuring process no matter be that sensor moves or workpiece moves; The joint piece all can not collide with workpiece, avoids interfering, thereby has increased the length measured scope.

3, the present invention has prepared various measuring staff length, only needs loading and unloading measuring staff 3, just can reach to change measuring staff length and then change the purpose of measuring range, has reduced ergometry simultaneously, the scuffing when having eliminated workpiece calibration.

4, the present invention has improved the repeatability of measuring accuracy and instrument through the position relation at the adjustment centre of gyration, sensor contact center and gauge head center when reducing installation requirement.

Description of drawings

Fig. 1 is existing sensor construction synoptic diagram.

Fig. 2 is a structural representation of the present invention.

Reference numeral is following: 1-gauge head, 2-chaining pin, 3-measuring staff, 4-adapter, the 5-centre of gyration, 6-sensor, 7-sensor contact, 8-sensor connector piece.

Embodiment

Referring to Fig. 1 and Fig. 2; A kind of arbitrary triangle sensor involved in the present invention, comprise sensor connector piece 8, be installed in sensor 6 on the sensor connector piece 8, through the centre of gyration 5 be hinged on adapter 4 on the sensor connector piece 8, be arranged on adapter 4 one ends measuring staff 3, be arranged on the chaining pin 2 of measuring staff 3 away from an end of adapter 4; The other end of adapter 4 contacts with sensor contact 7; The line at the centre of gyration 5 and sensor contact 7 centers and measuring staff 3 are parallel and be positioned at the top of measuring staff 3.For avoiding the joint piece can not collide, preferably that sensor connector piece 8 bottom surfaces are parallel with surface level and be positioned at the top of measuring staff 3 with testee.Thereby measure the measurement of range realization to various workpiece ranges in order to change, measuring staff 3 is a plurality of replaceable measuring staffs that are uneven in length.

The method of calibration of a kind of arbitrary triangle sensor involved in the present invention comprises following steps:

1) sensor installation: during sensor installation, earlier measuring staff 3 is parallel to work top, adjustment sensor contact 7 centers, until sensor reading in median location, then during this position sensor contact 7 centers and the centre of gyration 5 at same straight line;

2) prepare the slip gauge of seven to nine kinds of differing heights, and be close to from big to small on the work top by height value, its height theoretical value is one group of numerical value H _Reason

3) measure the height value that this chunk is advised respectively with sensor, measured value is one group of variation delta Data of sensor contact 7, with the long L of measuring staff ₁, the centre of gyration to gauge head center vertical range L ₂, the centre of gyration to sensor contact 7 centers L ₃And sensor coefficient C substitution formula:

$H=L_2-L_1*C*\mathrm{\&Delta;Data}/L_3-L_2*\sqrt{{{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="H2009102195658E00011.png"\; state="\{\{state\}\}">L</figure-callout>}}_3}^2-{(\mathrm{\&Delta;Data}*C)}^2)}/{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="H2009102195658E00011.png"\; state="\{\{state\}\}">L</figure-callout>}}_3,$

Can draw one group of corresponding variable quantity H of gauge head 1 center;

4) compare gauge head 1 center variable quantity H and rule theoretical value H highly _Reason, according to the formula of step 3), utilize optimized calculation method to iterate, make H infinitely approach H _ReasonThereby draw L ₁, L ₂, L ₃And one group of calibration value of C;

5) the parameter value substitution program that calibrates is remeasured, the accuracy of confirmatory measurement is eliminated alignment error; If accuracy is relatively poor, then repeating step 3) and step 4) demarcate each parameter again.

5, the method for calibration of arbitrary triangle sensor according to claim 4 is characterized in that: the height value of said slip gauge is seven to nine kinds.

At least should measure the slip gauge of height value more than four kinds, because L1 is arranged, L2, L3, four parameters of C when finding the solution.In order to carry out verification more accurately, the height value of slip gauge should seven to nine kinds.

It is horizontal that the present invention is improved to the bottom surface with the S shape of sensor connector piece 8 of the prior art; It is more that the bottom surface of sensor connector piece 8 exceeds the gauge head center like this; Can guarantee in measuring process no matter be that sensor moves or workpiece moves; The joint piece all can not collide with testee, avoids interfering, thereby has increased the length measured scope.

With measuring staff 3 centres of gyration 5 is benchmark; Only need guarantee during installation that sensor contact 7 centers and the centre of gyration 5 are same straight line (this can pass through to realize measuring staff 3 levellings); And be parallel to work top, and no longer require gauge head 1 center, the measuring staff centre of gyration 5, sensor contact 7 center sight alignments.

The present invention simultaneously can prepare various measuring staff length, only needs loading and unloading measuring staff 3, just can reach to change measuring staff length, and then change the purpose of measuring range, realizes the measurement to various workpiece ranges.After the long replacing of bar, according to calibrating function of the present invention, method of calibration promptly of the present invention can calibrate each parameter value accurately, accurately and reliably.

The long calibration function of bar among the present invention can accurately be demarcated each pole length before measurement, guarantee the accurately reliable of measurement result.The implementation method of demarcating is: utilize one group of intrinsic L of original parameter during measurement ₁, L ₂, L ₃And the theoretical parameter value of C, measure chunk rule height value (four kinds more than the differing heights, seven to nine kinds of the bests), the variable quantity H and the well-known theory slip gauge height value H at the gauge head center 1 that relatively obtains by above-mentioned parameter _Reason, utilize optimized calculation method to seek L ₁, L ₂, L ₃And the actual value of C, H and H _ReasonError is minimum, is L thereby draw each parameter ₁, L ₂, L ₃And the calibration value of C, eliminate alignment error and then can accurately measure.

Claims (2)

1. the method for calibration of an arbitrary triangle sensor, it is characterized in that: it comprises following steps:

1) sensor installation: said sensor comprises sensor connector piece (8), be installed in sensor (6) on the sensor connector piece (8), through the centre of gyration (5) be hinged on adapter (4) on the sensor connector piece (8), be arranged on adapter (4) one ends measuring staff (3), be arranged on the chaining pin (2) of measuring staff (3) away from an end of adapter (4); The other end of said adapter (4) contacts with sensor contact (7); The said centre of gyration (5) is parallel with measuring staff (3) with the line at sensor contact (7) center and be positioned at the top of measuring staff (3), and said sensor connector piece (8) bottom surface is parallel with surface level and be positioned at the top of measuring staff (3),

During sensor installation, earlier measuring staff (3) is parallel to work top, adjustment sensor contact (7) center, until sensor reading in median location, then during this position sensor contact (7) center and the centre of gyration (5) at same straight line;

2) prepare the slip gauge of at least four kinds of differing heights, and be close on the work top, its height theoretical value is one group of numerical value H _Reason

3) measure the height value that this chunk is advised respectively with sensor, measured value is one group of variation delta Data of sensor contact (7), with the long L of measuring staff ₁, the centre of gyration to gauge head center vertical range L ₂, the centre of gyration to sensor contact (7) center L ₃And sensor coefficient C substitution formula:

$H=L_2-L_1*C*\mathrm{\&Delta;Data}/L_3-L_2*\sqrt{{L_3}^2-(\mathrm{\&Delta;Data}*C{)}^2)}/L_3,$

Promptly draw one group of corresponding variable quantity H of gauge head (1) center;

4) compare gauge head (1) center variable quantity H and rule theoretical value H highly _Reason, according to the formula of step 3), utilize optimized calculation method to iterate, make H infinitely approach H _ReasonThereby draw L ₁, L ₂, L ₃And one group of calibration value of C;

5) the parameter value substitution program that calibrates is remeasured, the accuracy of confirmatory measurement is eliminated alignment error; If accuracy is relatively poor, then repeating step 3) and step 4) demarcate each parameter again.

2. the method for calibration of arbitrary triangle sensor according to claim 1 is characterized in that: the height value of said slip gauge is seven to nine kinds.

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