CN106895775A - A kind of termination of stay wire displacement sensor - Google Patents
A kind of termination of stay wire displacement sensor Download PDFInfo
- Publication number
- CN106895775A CN106895775A CN201710143218.6A CN201710143218A CN106895775A CN 106895775 A CN106895775 A CN 106895775A CN 201710143218 A CN201710143218 A CN 201710143218A CN 106895775 A CN106895775 A CN 106895775A
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- wiring
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- positioning main
- sliding
- displacement sensor
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 35
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 24
- 238000000034 method Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000007476 Maximum Likelihood Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The present invention relates to a kind of termination of stay wire displacement sensor, including positioning spindle, multiple wiring slide rails, multiple slide rail linking arms and multiple wiring sliding blocks；Wherein, slide rail linking arm is slided and is placed on positioning spindle, is separated by axle sleeve between slide rail linking arm；Wiring slide rail is fixedly connected one by one with slide rail linking arm, and is swung positioning spindle Wei Yu centers around positioning spindle；The wiring slide rail is provided with circular arc groove；The circular arc groove extends move closer to positioning spindle from top to bottom, more down more flat；Wiring sliding block is placed in the circular arc groove and hauls the bracing wire of stay wire displacement sensor and slided along circular arc groove.The present invention can realize that the theoretical extension of a plurality of bracing wire converges at the function of a bit, reduce frictional resistance of the sensor wire head in slide rail sliding process, improve certainty of measurement.
Description
Technical Field
The invention relates to the technical field of precision measurement, in particular to a wiring device of a stay wire displacement sensor.
Background
The three-dimensional measurement technology is an important component of industrial detection, the accuracy of measurement data of the three-dimensional measurement technology directly affects errors of production processes such as precision machining and assembly, the precision requirement of the three-dimensional measurement technology is improved from a micron level to an n m level, and the trend is more rapid than one year. The three-dimensional measurement products are widely applied and various in variety, and although the operation mode, the working environment, the working efficiency, the measurement principle and the measurement precision of each type of three-dimensional measurement products are obviously different besides the cost, the final targets of the products for acquiring the coordinate values of the point cloud (x, y and z) are consistent. The most widely used equipment at present is a laser tracker, but the laser tracker has high cost and is not easy to carry, so the development of the three-dimensional measurement technology is restricted, but the problem is gradually solved along with the appearance of three-dimensional measurement equipment based on a stay wire type displacement sensor.
The pull-wire type displacement sensor is also called a pull-wire encoder, the function of the pull-wire type displacement sensor is to convert the mechanical movement of the high-flexibility composite steel wire into an electric signal which can be measured, recorded and transmitted through a potentiometer, the advantages of an angle displacement sensor and a linear displacement sensor are combined, and the pull-wire type displacement sensor belongs to a linear displacement sensor. The sensor is only often applied to two-dimensional measurement and control systems of various distances, speeds, accelerations and the like at first, but along with the development of measurement technology, a stay wire type displacement sensor body is gradually and widely used in a three-dimensional measurement environment due to the advantages of small volume, simple structure, convenience in installation, wide measurement range, convenience in operation, low price and strong anti-interference capability.
The stay wire displacement sensor requires a plurality of stay wires (four most common stay wires) to converge at one point in a three-dimensional measurement occasion. However, unlike the laser tracker, the stay wire displacement sensor is usually fixed to a wiring device (non-standard component) during the actual measurement process, and no matter what the wiring device has a certain geometric size, the connector lug of the stay wire displacement sensor originally occupies a certain spatial position, which means that a plurality of stay wires are directly converged at one point, which is only an ideal analysis result.
In addition, most of common three-dimensional measurement occasions are dynamic environments, which requires that the wiring device can theoretically meet the condition that four pull wires are converged at one point in real time, however, the structure does not exist in the market, and the measurement precision of the system is greatly reduced by the factors.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the wiring device of the stay wire displacement sensor, which can meet the condition that theoretical extension lines of a plurality of stay wires are converged at one point and ensure the precision of a measuring system during dynamic measurement.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: the device comprises a positioning main shaft, a plurality of wiring sliding rails, a plurality of sliding rail connecting arms and a plurality of wiring sliding blocks; the sliding rail connecting arms are slidably sleeved on the positioning main shaft and are separated by a shaft sleeve; the wiring sliding rails are fixedly connected with the sliding rail connecting arms one by one and swing around the positioning main shaft to surround the positioning main shaft at the center; the wiring slide rail is provided with an arc slide rail groove; the arc slide rail groove extends from top to bottom and is gradually close to the positioning main shaft, and the arc slide rail groove is flatter downwards; the wiring sliding block is sleeved in the arc sliding rail groove and pulls the stay wire of the stay wire displacement sensor to slide along the arc sliding rail groove.
Furthermore, the top end of the positioning main shaft is provided with two threaded through holes for fixing a measured object, the bottom end of the positioning main shaft is provided with threads, and the positioning main shaft shoulder and the threaded nut are matched for limiting, so that the slide rail connecting arm can smoothly rotate around the positioning main shaft, and the slide rail connecting arm is prevented from sliding in the axial direction of the positioning main shaft.
Furthermore, the sliding rail connecting arm is provided with an arc through hole which is sleeved on the positioning main shaft, two ends of the arc through hole are respectively provided with an arc groove for mounting a bearing, and a base hole interference fit structure is arranged between the bearing and the arc groove and between the bearing and the positioning main shaft.
Furthermore, the tail part of the wiring sliding rail is provided with a square groove for avoiding the wiring sliding rail from moving and interfering with the positioning main shaft.
Furthermore, the wiring sliding block comprises a U-shaped sliding block wiring piece, a sliding block rotating shaft and a bearing pulley; the U-shaped bottom of the U-shaped sliding block wiring piece is integrally formed with an external thread cylinder connected with a wiring head of the stay wire displacement sensor, a semicircular groove is formed at a position close to a U-shaped opening, a sliding block rotating shaft is installed in the semicircular groove, and a bearing pulley is sleeved on the sliding block rotating shaft; the wiring sliding block slides along the arc sliding rail groove through the bearing pulley after receiving the pulling force of the pulling wire displacement sensor.
Based on the wiring device, in the three-dimensional measurement process, when the wiring device is in a stress balance state, the actual distance from each stay wire displacement sensor to a measured point is easily obtained, and then a least square model is established by combining the fixed coordinate points of each known stay wire displacement sensor and adopting a coordinate estimation method based on a maximum likelihood method, so that the spatial coordinate value of the measured point can be obtained.
Compared with the prior art, the scheme introduces a plurality of rotatable slide rail connecting arms, so that the slide rail plane of the wiring device is parallel to the wire pulling direction; a plurality of wiring sliding rails which are in one-to-one correspondence with the sliding rail connecting arms are introduced, so that the function that theoretical extension lines of a plurality of pull wires are converged at one point is realized; a plurality of wiring sliding blocks which correspond to the wiring sliding rails one to one are introduced, so that the friction resistance of the sensor connector lug in the sliding process of the sliding rails is reduced, and the measurement precision is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a positioning spindle according to the present invention;
FIG. 3 is a schematic structural view of the wiring slide rail of the present invention;
FIG. 4 is a schematic view of the connecting arm of the slide rail according to the present invention;
FIG. 5 is an exploded view of the wiring slider of the present invention;
FIG. 6 is a force diagram of the present invention in a vertical orientation;
FIG. 7 is a diagram of the present invention in a horizontal orientation;
FIG. 8 is a schematic diagram of the solution of the measured point in the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples:
the wiring device of the stay wire displacement sensor in the embodiment comprises a positioning main shaft 1, four wiring sliding rails 2, four sliding rail connecting arms 3 and four wiring sliding blocks 4.
Referring to fig. 2, the top end of the positioning main shaft 1 is provided with two threaded through holes 101 for fixing a measured object, and the bottom end is provided with threads.
Referring to fig. 4, the slide rail connecting arm 3 is provided with an arc through hole 301 which is sleeved on the positioning main shaft 1, both ends of the arc through hole 301 are provided with arc grooves 302 for mounting bearings, and the bearings and the arc grooves 302 and the bearings and the positioning main shaft 1 are in a base hole interference fit structure.
Referring to fig. 3, the wiring slide rail 2 is provided with an arc slide rail groove 5, and the arc slide rail groove 5 extends from top to bottom and gradually approaches the positioning main shaft 1, and is flatter when going down; the tail part of the wiring slide rail 2 is provided with a square groove 201 for avoiding the wiring slide rail from moving and interfering with the positioning main shaft 1.
Referring to fig. 5, the wire connecting slider 4 includes a U-shaped slider wire connecting member 401, a slider rotating shaft 402, and a bearing pulley 403; the U-shaped bottom of the U-shaped sliding block wiring piece 401 is integrally formed with an external thread cylinder 404 connected with a wiring head of the stay wire displacement sensor, a semicircular groove 405 is formed at a position close to a U-shaped opening, a sliding block rotating shaft 402 is installed in the semicircular groove 405, and a bearing pulley 403 is sleeved on the sliding block rotating shaft 402.
Referring to fig. 1, the wiring device is assembled as follows:
the four slide rail connecting arms 3 are respectively sleeved on the positioning main shaft 1 through the arc through holes 301 of the four slide rail connecting arms, shaft sleeves are arranged among the four slide rail connecting arms, and meanwhile, under the matching of bearings, each slide rail connecting arm 3 can smoothly rotate around the positioning main shaft 1; in addition, the shaft shoulder of the positioning main shaft 1 is matched with the threaded nut for limiting, so that the sliding condition of the sliding rail connecting arm 3 in the axial direction of the positioning main shaft 1 can be avoided. The wiring sliding rails 2 are fixedly connected with the sliding rail connecting arms 3 one by one, and swing around the positioning main shaft 1 to surround the positioning main shaft 1 at the center; the wiring sliding block 4 is sleeved in the arc sliding rail groove 5 of the wiring sliding rail 2 and slides along the arc sliding rail groove 5 through the bearing pulley 403.
The specific motion mode of the wiring device is as follows:
after the positioning main shaft 1 is fixed, a stay wire of the stay wire displacement sensor is connected with a U-shaped sliding block wiring piece 401, and a wiring sliding block 4 is subjected to the pulling force F of the stay wire. If the pulling force F is parallel to the supporting force of the arc-shaped slide rail groove 5, the wiring device is in a balanced state. If the pulling force F is not parallel to the supporting force of the arc-shaped slide rail groove 5, in the vertical direction, the wiring slide rail 2 receives a component force F1 of the downward pulling force F, so as to urge the wiring slide block 4 to move downward until the vertical direction is in a balanced state, as shown in fig. 6 (in the figure, the component force F2 does not affect the balanced state); meanwhile, in the horizontal direction, the wiring sliding rail 2 receives a pulling force component F1 'perpendicular to the side surface of the wiring sliding rail 2, so that the wiring sliding rail 2 drives the sliding rail connecting arm 3 to rotate around the positioning main shaft 1 until the horizontal direction is in a balanced state, as shown in fig. 7 (in the figure, the component F2' does not affect the balanced state).
As shown in fig. 8, when the junction device is in a stress balance state, the actual distances l1, l2, l3, and l4 from the four stay wire displacement sensors A, B, C, D to the measured point E are respectively: L1-L1 + r, L2-L2 + r, L3-L3 + r, and L4-L4 + r, wherein L1, L2, L3, and L4 respectively represent the rope lengths of the four stay wire displacement sensors, and r represents the radius of the circular arc slide rail groove 5 in the wiring slide rail 2.
Therefore, if the fixed point coordinates a (Xa, Ya, Za), B (Xb, Yb, Zb), C (Xc, Yc, Zc), and D (Xd, Yd, Zd) of the four pull wire displacement sensors are known, a least square model can be established by using a coordinate estimation method based on a maximum likelihood method, and a spatial coordinate value of the measured point E (X, Y, Z) can be obtained. The calculation model is as follows:
X＝(PTP)-1PTL
wherein,
in the embodiment, a plurality of rotatable slide rail connecting arms are introduced, so that the slide rail plane of the wiring device is parallel to the wire pulling direction; a plurality of wiring sliding rails which are in one-to-one correspondence with the sliding rail connecting arms are introduced, so that the function that theoretical extension lines of a plurality of pull wires are converged at one point is realized; a plurality of wiring sliding blocks which correspond to the wiring sliding rails one to one are introduced, so that the friction resistance of the sensor connector lug in the sliding process of the sliding rails is reduced, and the measurement precision is improved.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered within the scope of the present invention.
Claims (5)
1. The utility model provides a termination of displacement sensor acts as go-between which characterized in that: the device comprises a positioning main shaft (1), a plurality of wiring sliding rails (2), a plurality of sliding rail connecting arms (3) and a plurality of wiring sliding blocks (4); the sliding rail connecting arms (3) are slidably sleeved on the positioning main shaft (1), and the sliding rail connecting arms (3) are separated by a shaft sleeve; the wiring sliding rails (2) are fixedly connected with the sliding rail connecting arms (3) one by one and swing around the positioning main shaft (1) to surround the positioning main shaft (1) at the center; the wiring slide rail (2) is provided with an arc slide rail groove (5); the arc slide rail groove (5) extends from top to bottom and is gradually close to the positioning main shaft (1), and is flatter when going downwards; the wiring sliding block (4) is sleeved in the arc sliding rail groove (5) and slides along the arc sliding rail groove (5).
2. The wiring device of a pull-wire displacement sensor according to claim 1, wherein: the top end of the positioning main shaft (1) is provided with two threaded through holes (101) for fixing a measured object, the bottom end of the positioning main shaft is provided with threads, and the positioning main shaft (1) is matched with a threaded nut for limiting, so that the sliding rail connecting arm (3) can smoothly rotate around the positioning main shaft (1) and the sliding condition of the sliding rail connecting arm (3) in the axial direction of the positioning main shaft (1) is avoided.
3. The wiring device of a pull-wire displacement sensor according to claim 1, wherein: the sliding rail connecting arm (3) is provided with an arc through hole (301) which is sleeved on the positioning main shaft (1), two ends of the arc through hole (301) are respectively provided with an arc groove (302) for mounting a bearing, and a base hole interference fit structure is arranged between the bearing and the arc groove (302) and between the bearing and the positioning main shaft (1).
4. The wiring device of a pull-wire displacement sensor according to claim 1, wherein: the tail part of the wiring sliding rail (2) is provided with a square groove (201) for avoiding the wiring sliding rail from moving and interfering with the positioning main shaft (1).
5. The wiring device of a pull-wire displacement sensor according to claim 1, wherein: the wiring sliding block (4) comprises a U-shaped sliding block wiring piece (401), a sliding block rotating shaft (402) and a bearing pulley (403); the U-shaped bottom of the U-shaped sliding block wiring piece (401) is integrally formed with an external thread cylinder (404) connected with a wiring head of a stay wire displacement sensor, a semicircular groove (405) is formed at a position close to a U-shaped opening, a sliding block rotating shaft (402) is installed in the semicircular groove (405), and a bearing pulley (403) is sleeved on the sliding block rotating shaft (402); the wiring sliding block (4) receives the pulling force of the pulling displacement sensor and slides along the arc sliding rail groove (5) through the bearing pulley (403).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710143218.6A CN106895775B (en) | 2017-03-11 | 2017-03-11 | A kind of termination of stay wire displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710143218.6A CN106895775B (en) | 2017-03-11 | 2017-03-11 | A kind of termination of stay wire displacement sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106895775A true CN106895775A (en) | 2017-06-27 |
| CN106895775B CN106895775B (en) | 2019-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710143218.6A Expired - Fee Related CN106895775B (en) | 2017-03-11 | 2017-03-11 | A kind of termination of stay wire displacement sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107363810A (en) * | 2017-07-17 | 2017-11-21 | 上海大学 | More sphere bracing wires measure adapter mechanism |
| CN114485371A (en) * | 2022-02-28 | 2022-05-13 | 重庆长安新能源汽车科技有限公司 | Stay wire mounting device of stay wire displacement sensor |
| CN114485513A (en) * | 2021-12-30 | 2022-05-13 | 南京理工大学 | Be applied to displacement sensor that acts as go-between to act as go-between fixer |
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|---|---|---|---|---|
| JP2006038602A (en) * | 2004-07-26 | 2006-02-09 | Kyokuto Sanki Co Ltd | Method and apparatus for measuring dimension of frontage |
| CN103486989A (en) * | 2013-09-16 | 2014-01-01 | 南京航空航天大学 | Guy cable type spatial position measurement mechanism and method |
| CN203642836U (en) * | 2013-11-29 | 2014-06-11 | 上海汇众汽车制造有限公司 | Stay wire displacement sensor and stay wire direction adjusting assembly thereof |
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2017
- 2017-03-11 CN CN201710143218.6A patent/CN106895775B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006038602A (en) * | 2004-07-26 | 2006-02-09 | Kyokuto Sanki Co Ltd | Method and apparatus for measuring dimension of frontage |
| CN103486989A (en) * | 2013-09-16 | 2014-01-01 | 南京航空航天大学 | Guy cable type spatial position measurement mechanism and method |
| CN203642836U (en) * | 2013-11-29 | 2014-06-11 | 上海汇众汽车制造有限公司 | Stay wire displacement sensor and stay wire direction adjusting assembly thereof |
Non-Patent Citations (1)
| Title |
|---|
| 龚成 等: "基于拉线位移传感器的动态空间位置测量方法", 《机械设计与制造工程》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107363810A (en) * | 2017-07-17 | 2017-11-21 | 上海大学 | More sphere bracing wires measure adapter mechanism |
| CN114485513A (en) * | 2021-12-30 | 2022-05-13 | 南京理工大学 | Be applied to displacement sensor that acts as go-between to act as go-between fixer |
| CN114485371A (en) * | 2022-02-28 | 2022-05-13 | 重庆长安新能源汽车科技有限公司 | Stay wire mounting device of stay wire displacement sensor |
| CN114485371B (en) * | 2022-02-28 | 2023-08-25 | 深蓝汽车科技有限公司 | Stay wire mounting device of stay wire displacement sensor |
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| CN106895775B (en) | 2019-08-23 |
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