CN104121863A - Non-contact hole diameter measuring device - Google Patents
Non-contact hole diameter measuring device Download PDFInfo
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- CN104121863A CN104121863A CN201410360197.XA CN201410360197A CN104121863A CN 104121863 A CN104121863 A CN 104121863A CN 201410360197 A CN201410360197 A CN 201410360197A CN 104121863 A CN104121863 A CN 104121863A
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- battery lead
- lead plate
- lining seat
- hinged
- ball screw
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Abstract
The invention discloses a non-contact hole diameter measuring device. At present, a capacitance type sensor measuring head applied to hole diameter of a micro hole is restricted to measuring some fixed hole diameter and is low in measuring efficiency. A ball screw is fixed with an output shaft of an adjusting motor, a scale grating is fixed on the ball screw, a screw rod nut is connected with the ball screw, and an indicating grating is fixed with the screw rod nut. One end of each of four connecting rods is hinged to a motor base of the adjusting motor, and the other end of each connecting rod is respectively hinged to one push rod. One end of each of four push rods is hinged to the screw rod nut, and the other end of each push rod is respectively fixed with one electrode plate liner base. Electrode plates are respectively fixed on the end faces of the same ends of four electrode plate liner bases, the electrode plate liner bases and electrode plates are cylinders with the cross sections in a fan shape, and the four electrode plates are evenly distributed along the circumference. The electrode plates are adjustable in the radial direction, and precision measurement of variable hole diameters, including measurement of micro holes with large length-diameter ratios and stepped holes, can be achieved.
Description
Technical field
The invention belongs to fine measuring instrument technical field, relate to aperture measurement device, be specifically related to a kind of contactless aperture measurement device.
Background technology
Along with modern science and technology are the developing rapidly of the industrial circles such as Aero-Space, mould, automobile, the processing of micro-aperture and measuring technique are one of important directions of Chinese scholars research.Non-cpntact measurement has and is not subject to the impact of ergometry and measuring accuracy compared with advantages of higher, makes up the deficiency that contact type measurement exists, and in micro-aperture is measured, is widely used.
The research launching around microsize high-acruracy survey, has very important significance.The method of non-contact measurement micro-aperture mainly contains at present: the Fraunhofer diffraction mensuration of optical measuring method, capacitance sensing mensuration, aperture and pneumatic gauging method., there is scholar to propose a kind of measuring method based on aiming at trigger theory abroad, realize the accurate measurements and calculations of micro-pore diameter, circularity, area; Domestic, the long storehouse of the grandson of University Of Tianjin etc., based on capacitive transducer principle, propose the method and apparatus of micro measurement, and it is simple in structure, easy to operate, highly sensitive.Capacitance type sensor has the advantages such as precision is high, dynamic perfromance is good in micro hole inside diameter measurement, yet its gauge head is confined to measure a certain constant aperture, measuring different apertures needs the transducer probe assembly of different size, thereby causes measuring Efficiency Decreasing, measures cost and raises.
Summary of the invention
Object of the present invention, for the deficiencies in the prior art, provides a kind of contactless aperture measurement device, and this device can be realized the precision measurement that becomes aperture, effectively improves and measures efficiency and measuring accuracy; Simple in structure, compact, and cost is lower.
The present invention includes and regulate motor, connecting rod, scale grating, indication grating, feed screw nut, battery lead plate, push rod, ball screw and battery lead plate lining seat.Described ball screw is fixed with regulating the output shaft of motor, and scale grating is fixedly nested with on ball screw; Described feed screw nut is connected with ball screw, and described indication grating and feed screw nut fix, and is nested with outside scale grating; One end of four connecting rods is all hinged with the motor cabinet of adjusting motor, and the other end is hinged with a push rod respectively; One end of four push rods is all hinged with feed screw nut, and the other end is fixing with a battery lead plate lining seat respectively; Described four battery lead plates lining seat is uniformly distributed along the circumference, and is fixed with respectively an electrode plate with one end end face; Described battery lead plate lining seat and battery lead plate are all xsect for the cylinder of fan ring; The lateral wall place circle diameter of described battery lead plate lining seat is greater than the lateral wall place circle diameter of battery lead plate; Described battery lead plate lining seat adopts insulating material; Four electrode plate are uniformly distributed along the circumference.
Described battery lead plate lining seat and central angle corresponding to battery lead plate equate.
The setting of aliging with the madial wall of battery lead plate of described battery lead plate lining seat.
The adjustable extent of the lateral wall place circle diameter of described four electrode plate is 10～30mm.
Beneficial effect of the present invention:
1, battery lead plate of the present invention is radially adjustable, thereby realizes the precision measurement that becomes aperture, comprises the micropore of big L/D ratio, the measurement of shoulder hole;
2, the present invention adopts capacitive transducer measuring principle, effectively improves the efficiency of measuring, and guarantees the precision of measurement in relatively large journey, simple in structure, measures cost low.
Accompanying drawing explanation
Fig. 1 is one-piece construction stereographic map of the present invention;
Fig. 2 is one-piece construction schematic diagram of the present invention.
Embodiment
As illustrated in fig. 1 and 2, contactless aperture measurement device, comprises and regulates motor 1, connecting rod 2, scale grating 3, indication grating 4, feed screw nut 5, battery lead plate 6, push rod 7, ball screw 8 and battery lead plate lining seat 9.Ball screw 8 is fixed with regulating the output shaft of motor 1, and scale grating 3 is fixedly nested with on ball screw 8; Feed screw nut 5 is connected with ball screw 8, and indication grating 4 is fixing with feed screw nut 5, and is nested with outside scale grating 3; One end of four connecting rods 2 is all hinged with the motor cabinet of adjusting motor 1, and the other end is hinged with a push rod 7 respectively; One end of four push rods 7 is all hinged with feed screw nut 5, and the other end is fixing with a battery lead plate lining seat 9 respectively; Four battery lead plate lining seats 9 are uniformly distributed along the circumference, and are fixed with respectively an electrode plate 6 with one end end face; Battery lead plate lining seat 9 and battery lead plate 6 are all xsect for the cylinder of fan ring; The central angle of battery lead plate lining seat 9 and battery lead plate 6 correspondences equates, and battery lead plate lining seat 9 settings of aliging with the madial wall of battery lead plate 6, and battery lead plate serves as a contrast a lateral wall place circle diameter of 9 than the large 0.2mm of lateral wall place circle diameter of battery lead plate 6; Battery lead plate lining seat 9 adopts insulating material; Four electrode plate 6 are uniformly distributed along the circumference, and the adjustable extent of the lateral wall place circle diameter of four electrode plate is 10～30mm.
The principle of work of this contactless aperture measurement device:
Battery lead plate 6 is stretched into measured hole and measure, regulate motor 1 to drive ball-screw 8 to rotate, thereby drive feed screw nut 5 in axis direction slip (feed screw nut is subject to the acting force that connecting rod 2 passes to push rod 7, the limitation of movement of circumferencial direction); Also motion thereupon of push rod 7 simultaneously, drive link 2 swings; Four push rods launch simultaneously or shrink to drive four electrode plate 6 and four battery lead plates to serve as a contrast the diameter that seat 9 regulates place circumference.When battery lead plate lining seat 9 contacts with the hole wall of measured hole, just can measure the diameter of measured hole.
Scale grating 3 and indication grating 4 form grating displacement sensor, in feed screw nut's 5 moving process, drive indication grating 4 to move, and by scale grating 3 and the change of distance of indication grating 4, realize feed screw nut 5 displacement measurement.
As shown in Figure 2, the hinged center B that establishes feed screw nut 5 to the initial distance that regulates a hinged center A of motor 1 correspondence be l
0, the hinged center D of connecting rod 2 and push rod 7 is b to the distance of a hinged center B corresponding to feed screw nut 5, and feed screw nut 5 vertically moving displacement is Δ l, and the length of push rod 7 is c, and the length of connecting rod 2 is a, the radius of the lateral wall place circumference of battery lead plate 6
r＝csinθ+r
0 (1)
In formula (1), r
0radius value for feed screw nut 5 B place, hinged center circumference; θ is the angle between hinged center A, B line and hinged center B, D line, by the cosine law, is obtained
Capacitance between battery lead plate 6 and measured hole is:
In formula (2), by Taylor series expansion, can be obtained
Δ r is the radial play of battery lead plate 6 and measured hole; ε is the specific inductive capacity of air, L
maxial length for battery lead plate 6; R is the radius of measured hole.
Detect the capacitance C between each battery lead plate 6 and measured hole
i(i=1,2,3,4), substitution formula (2) solves Δ r respectively
i(i=1,2,3,4).The aperture D of measured hole can be expressed as:
The battery lead plate of this contactless aperture measurement device is radially adjustable, thereby realizes the precision measurement that becomes aperture, comprises the micropore of big L/D ratio, the measurement of shoulder hole; Adopt capacitive transducer measuring principle, can eliminate the impact of the end surface shape in hole on measuring accuracy, effectively improve the efficiency of measuring, in relatively large journey, guarantee the precision of measuring.
Claims (4)
1. contactless aperture measurement device, comprises and regulates motor, connecting rod, scale grating, indication grating, feed screw nut, battery lead plate, push rod, ball screw and battery lead plate lining seat, it is characterized in that:
Described ball screw is fixed with regulating the output shaft of motor, and scale grating is fixedly nested with on ball screw; Described feed screw nut is connected with ball screw, and described indication grating and feed screw nut fix, and is nested with outside scale grating; One end of four connecting rods is all hinged with the motor cabinet of adjusting motor, and the other end is hinged with a push rod respectively; One end of four push rods is all hinged with feed screw nut, and the other end is fixing with a battery lead plate lining seat respectively; Described four battery lead plates lining seat is uniformly distributed along the circumference, and is fixed with respectively an electrode plate with one end end face; Described battery lead plate lining seat and battery lead plate are all xsect for the cylinder of fan ring; The lateral wall place circle diameter of described battery lead plate lining seat is greater than the lateral wall place circle diameter of battery lead plate; Described battery lead plate lining seat adopts insulating material; Four electrode plate are uniformly distributed along the circumference.
2. contactless aperture measurement device according to claim 1, is characterized in that: described battery lead plate lining seat and central angle corresponding to battery lead plate equate.
3. contactless aperture measurement device according to claim 1, is characterized in that: the setting of aliging with the madial wall of battery lead plate of described battery lead plate lining seat.
4. contactless aperture measurement device according to claim 1, is characterized in that: the adjustable extent of the lateral wall place circle diameter of described four electrode plate is 10～30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410360197.XA CN104121863B (en) | 2014-07-25 | 2014-07-25 | Contactless aperture measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410360197.XA CN104121863B (en) | 2014-07-25 | 2014-07-25 | Contactless aperture measurement device |
Publications (2)
| Publication Number | Publication Date |
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| CN104121863A true CN104121863A (en) | 2014-10-29 |
| CN104121863B CN104121863B (en) | 2016-09-14 |
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| CN201410360197.XA Active CN104121863B (en) | 2014-07-25 | 2014-07-25 | Contactless aperture measurement device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106225661A (en) * | 2016-07-10 | 2016-12-14 | 上海大学 | Punching press bore dia device for fast detecting and method thereof on thin-wall part |
| CN107063091A (en) * | 2017-04-11 | 2017-08-18 | 合肥工业大学 | For big L/D ratio pipe fitting endoporus measuring multiple parameters device and method |
| CN109556552A (en) * | 2018-11-19 | 2019-04-02 | 哈尔滨理工大学 | A kind of hole diameter detection apparatus for eliminating hole true position error influence |
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| US20090249635A1 (en) * | 2008-04-03 | 2009-10-08 | Foxnum Technology Co., Ltd. | Apparatus and method for measuring diameter of hole |
| CN202171445U (en) * | 2011-06-24 | 2012-03-21 | 中冶建筑研究总院有限公司 | Pipeline effective internal diameter detection device |
| CN102927922A (en) * | 2012-10-12 | 2013-02-13 | 中北大学 | System for measuring inner diameter of tubular workpiece |
| CN103185562A (en) * | 2011-12-31 | 2013-07-03 | 中航威海船厂有限公司 | Round hole inner diameter measuring instrument |
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2014
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Patent Citations (6)
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| US20090249635A1 (en) * | 2008-04-03 | 2009-10-08 | Foxnum Technology Co., Ltd. | Apparatus and method for measuring diameter of hole |
| CN202171445U (en) * | 2011-06-24 | 2012-03-21 | 中冶建筑研究总院有限公司 | Pipeline effective internal diameter detection device |
| CN103185562A (en) * | 2011-12-31 | 2013-07-03 | 中航威海船厂有限公司 | Round hole inner diameter measuring instrument |
| CN102927922A (en) * | 2012-10-12 | 2013-02-13 | 中北大学 | System for measuring inner diameter of tubular workpiece |
| CN103206923A (en) * | 2013-03-21 | 2013-07-17 | 丹东东方测控技术有限公司 | Multi-arm underground caliper measurement probe and application method |
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| 孙长库等: "电容传感微小孔径的测量方法", 《纳米技术与精密工程》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106225661A (en) * | 2016-07-10 | 2016-12-14 | 上海大学 | Punching press bore dia device for fast detecting and method thereof on thin-wall part |
| CN106225661B (en) * | 2016-07-10 | 2019-06-04 | 上海大学 | Punching press bore dia device for fast detecting and its method on thin-wall part |
| CN107063091A (en) * | 2017-04-11 | 2017-08-18 | 合肥工业大学 | For big L/D ratio pipe fitting endoporus measuring multiple parameters device and method |
| CN109556552A (en) * | 2018-11-19 | 2019-04-02 | 哈尔滨理工大学 | A kind of hole diameter detection apparatus for eliminating hole true position error influence |
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| Publication number | Publication date |
|---|---|
| CN104121863B (en) | 2016-09-14 |
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