CN101231386A - System for dynamically correcting maximum astronomical telescope rollig friction transmission rotational axis torsion angle - Google Patents
System for dynamically correcting maximum astronomical telescope rollig friction transmission rotational axis torsion angle Download PDFInfo
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- CN101231386A CN101231386A CNA2008100207228A CN200810020722A CN101231386A CN 101231386 A CN101231386 A CN 101231386A CN A2008100207228 A CNA2008100207228 A CN A2008100207228A CN 200810020722 A CN200810020722 A CN 200810020722A CN 101231386 A CN101231386 A CN 101231386A
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Abstract
A dynamic correction system for torsion angle of a rolling friction/transmission rotation axis in a giant astronomical telescope is provided, wherein the rotating axial lines of a driving wheel and a driven wheel are arranged in parallel, and the driving wheel combines with a driving motor and a support bearing to from a driving wheel mechanism. The dynamic correction system is characterized in that the system further comprises a connecting lever supported against a support column via a rotating support frame; the driving wheel mechanism is arranged at the left end of the connecting lever; a counterweight is arranged at the right end of the connecting lever; a length gauge and a length gauge signal input control system are arranged for the real-time detection of the vertical motion of the connecting lever; an adjustment mechanism is arranged at the far right end of the connecting lever; steel balls are respectively arranged above and below the far right end of the connecting lever in a free rotation manner, with clearances therebetween; a correction motor is used for driving the frame to move up and down and is controlled by a control system. The invention realizes the real-time detection and on-line adjustment of torsion angle of rotation axes of the driving wheel and the driven wheel, avoids the jumping phenomenon of the torsion angle, and ensures the normal operation of the telescope.
Description
Technical field
The present invention relates to a kind of mechanical driving device, be specifically related to a kind of maximum astronomical telescope rollig friction transmission rotational axis torsion angle dynamic correction system.The present invention is subjected to National Natural Science Foundation of China (NSFC) and subsidizes.
Background technology
Cylindrical rolling friction transmission, owing to simple in structure, do not have backlash, Installation and Debugging and safeguard that reason such as convenient has relatively obtained application on large-scale astronomical telescope.As the U.S.'s 10 meters bore Keck astronomical telescope and 8 meters bore Gemini astronomical telescopes etc., China also adopts cylindrical rolling friction transmission at 4 meters bore LAMOST astronomical telescopes that grind at present.Under the perfect condition, the driving wheel of cylindrical rolling friction transmission should be parallel in the space with the engaged wheel rotation.But owing to reasons such as installation and long-plays, the relative position of driving wheel and engaged wheel rotation can change, and promptly there is angle in they in the space.The angle synoptic diagram as shown in Figure 1 and Figure 2.Driving wheel and engaged wheel rotation are referred to as the pitch angle at angle β radially, are referred to as torsion angle in tangential angle theta.Friction gearing is worked under positive pressure, and is so under positive pressure, it is very small that angle of inclination beta can disappear or become, little to the transmission influence.
But the existence of torsion angle is extremely harmful.Exist the friction gearing of torsion angle to be similar to and turn round the wheel friction gearing.Since the existence of torsion angle, friction force F
dOn the engaged wheel axis of rotation, produce an axial thrust load F by torsion angle
t
F
t＝F
d×sinθ
The effect of Ft is to cause that engaged wheel is in axially-movable.But generally speaking, engaged wheel is very heavy and rigidity is very high, and driving wheel is wanted almost relatively, therefore, can cause that driving wheel moves round about.Be embodied in driving wheel flexible distortion on certain direction.Driving wheel supporting rod generation elastic deformation particularly.As time goes on, Material Bar Member is also in continuous increase.When the restoring force of Material Bar Member is accumulated to a certain degree, surpassed between driving wheel and the engaged wheel in axial friction force, driving wheel goes back to the equilibrium position with " kick ", i.e. slippage mutually.Make that motion is asynchronous between driving wheel and the engaged wheel." kick " caused tracking error about 0.2 rad, takes place and is much higher than 0.2 rad in the transmission accuracy of astronomical optics telescope usually.For multiple goal fiber spectrum astronomical telescope, mean that the target celestial body of original aligning will part even whole deflection optical fiber head.The observation of big quantity fiber spectrum was just risen in the nineties in 20th century, therefore, adopted two kinds of methods to solve usually for the solution of this problem: the one, abandon this group data, and the 2nd, physical construction is adjusted.Astronomical telescope obtains the time of one group of observation data and does not wait, and the time shutter reaches 1.5 hours sometimes.And the observation time of a telescope in the evening also had only about 6 hours, and therefore, this problem has had a strong impact on the observed efficiency of astronomical telescope.For example.The LAMOST one action is aimed at 4000 target celestial bodies, and Continuous Tracking 1.5 hours, and this " kick " will cause these a series of work all that has been achieved is spoiled.For the very valuable astronomical telescope of operable time, this has had a strong impact on the output of telescopical work efficiency and achievement.If physical construction is readjusted, then required time is long, and workload is big.
Therefore, the dynamic system that presses for a kind of real-time detection of employing and revise is in real time carried out online detection and adjustment at the preceding timely torsion angle to driving wheel and engaged wheel rotation of generation " kick ", makes kinematic train be operated in steady state (SS).But still do not finish the technical scheme of this task in the prior art.
Summary of the invention
At the problems referred to above of prior art, the application's purpose provides a kind of maximum astronomical telescope rollig friction transmission rotational axis torsion angle dynamic correction system.By adopting this cover dynamic correction system, make in the friction gearing process driving wheel rotation and engaged wheel rotation tangentially remain parallel, guarantee the synchronized movement of driving wheel and engaged wheel, avoid the generation of " kick " phenomenon, guarantee that telescope can steady operation.
The technical solution used in the present invention is: a kind of maximum astronomical telescope rollig friction transmission rotational axis torsion angle dynamic correction system, the driving wheel of friction gearing and the shaft axis of engaged wheel be arranged in parallel, drive motor, driving wheel and spring bearing constitute the driving wheel structure, it is characterized in that, be provided with one and connect lever, this connects lever by rotating strong point frame on pillar, connects lever and can rotate around the strong point with respect to pillar; Described driving wheel structure is installed on the left end (with respect to pillar, as follows) that connects lever, is furnished with damper weight at the right-hand member of this connection lever; Be provided with the length gauge that real-time detection connects the upper and lower motion of lever at the right-hand member that connects lever, the signal of this length gauge is by the data line input control system; At the low order end that connects lever adjusting mechanism is housed, the structure of this adjusting mechanism is: upper and lower a steel ball is set respectively what connect the lever low order end, but these two steel balls are rack-mount with free rotation mode, and leave a gap between the lever low order end with being connected; Simultaneously, also be provided with the upper and lower mobile correction motor of driving arm, this revises motor by the signal controlling of control system according to the length gauge feedback.
If there are torsion angle in driving wheel rotation and engaged wheel rotation, then friction force is axially just having component, this power will cause that driving wheel (friction pulley) moves vertically.Length gauge can detect this motion in real time, and gives control system signal feedback, and control system is upper and lower mobile according to the support that this signal drives adjusting mechanism, and adjusts connecting the lever low order end by steel ball.Realization is to the real-time adjustment of torsion angle.
Among the present invention, under the effect of driving wheel structure and damper weight, connecting lever is balance with respect to the rotation strong point.This point is extremely important.The only guaranteed balance that connects lever, it is detected to make that friction force is easy at axial component, thereby detects the variation of torsion angle, and then regulates accordingly.Otherwise the axial thrust load of friction force can be disturbed by out-of-balance force, can't detect torsion angle and adjust torsion angle.Unbalanced moments is controlled in the 0.5N-m.If the weight of driving wheel structure changes, can adjust balance in the position that connects on the lever by adjusting damper weight.
In order to reduce the influence of friction torque, rotation strong point place adopts the very little rolling bearing of friction factor, and friction torque is about 0.2N-m.
Various moment of frictions are little in the lever balance structure, and its value is generally 1/10th of axial thrust load moment.
Length gauge is used for detecting in real time and connects moving up and down of lever, and length gauge is long as far as possible with the distance of the rotation strong point, can be convenient to the detection of length gauge to the amplification that moves up and down of driving wheel like this, simultaneously, also can reduce the requirement to the length gauge detection resolution.So the length gauge operated by rotary motion is on the right side of damper weight.
The steel ball of adjusting mechanism does not contact with being connected lever at ordinary times, and a gap h is arranged between the two.The h value is determined according to the lever arm length that connects lever, generally in 2 millimeter.Connecting lever is symmetrical with respect to two steel ball positions up and down.
The invention solves the technical barrier in the traditional scheme.Adopt dynamic correction system of the present invention, can online in real time detect the situation of driving wheel rotation and engaged wheel rotation torsion angle in the cylindrical rolling friction transmission, and can carry out online adjustment according to detection case.Avoided " kick " that cause because of torsion angle, guaranteed telescopical stable operation and improved telescopical service efficiency.
Description of drawings
Fig. 1 represents that driving wheel and engaged wheel rotation at radially angle β, are referred to as the pitch angle;
Fig. 2 represents that driving wheel and engaged wheel rotation in tangential angle theta, are referred to as torsion angle;
Fig. 3 is a structural representation of the present invention.
Embodiment
Embodiment 1, the maximum astronomical telescope rollig friction transmission rotational axis torsion angle dynamic correction system.With reference to Fig. 3: drive motor 1 is connected with driving wheel 2 by shaft coupling, connect lever 5 by 4 of the rotation strong points on pillar 11, connect lever 5 and can rotate around the strong point with respect to pillar 11.Driving wheel structure (comprising drive motor 1, driving wheel 2 and spring bearing 3) be fixed on be connected lever 5 left end (with respect to pillar 11, as follows), is furnished with damper weight 6 at the right-hand member that connects lever 5, making to connect lever 5 with respect to the rotation strong point 4, is balance under the effect of driving wheel structure and damper weight.Unbalanced moments is controlled in the 0.5N-m.Simultaneously, in order to reduce the influence of friction torque, rotation strong point place adopts the very little rolling bearing of friction factor, and friction torque is about 0.2N-m.If the weight of driving wheel structure changes, can adjust balance in the position that connects on the lever 5 by adjusting damper weight 6.Length gauge 10 is used for detecting in real time and connects moving up and down of lever, and length gauge 10 is long as far as possible with the distance of the rotation strong point 4, as shown in Figure 3, like this can be the amplification that moves up and down of driving wheel, be convenient to the detection of length gauge, simultaneously, also can reduce requirement the length gauge detection resolution.The signal of length gauge is by the data line input control system.At the low order end that connects lever adjusting mechanism 8 is housed, does not contact with being connected lever 5 when the steel ball of adjusting mechanism 7 is flat, a gap h is arranged between the two.The h value determines according to the lever arm length that connects lever 5, and generally in 2 millimeter, connecting lever 5 is symmetrical with respect to two steel ball positions up and down.Control system drives adjusting mechanism 8 according to the signal of length gauge feedback by drive motor 9, realizes the real-time adjustment to torsion angle.
Claims (6)
1. maximum astronomical telescope rollig friction transmission rotational axis torsion angle dynamic correction system, the driving wheel of friction gearing and the shaft axis of engaged wheel be arranged in parallel, drive motor, driving wheel and spring bearing constitute the driving wheel structure, it is characterized in that, be provided with one and connect lever, this connects lever by rotating strong point frame on pillar, connects lever and can rotate around the strong point with respect to pillar; Described driving wheel structure is installed on the left end that connects lever, is furnished with damper weight at the right-hand member of this connection lever; Be provided with the length gauge that real-time detection connects the upper and lower motion of lever at the right-hand member that connects lever, the signal of this length gauge is by the data line input control system; At the low order end that connects lever adjusting mechanism is housed, the structure of this adjusting mechanism is: upper and lower a steel ball is set respectively what connect the lever low order end, but these two steel balls are rack-mount with free rotation mode, and leave a gap between the lever low order end with being connected; Simultaneously, also be provided with the upper and lower mobile correction motor of driving arm, this revises motor by the signal controlling of control system according to the length gauge feedback.
2. maximum astronomical telescope rollig friction transmission rotational axis torsion angle dynamic correction system according to claim 1 is characterized in that, the unbalanced moments of described driving wheel structure and damper weight is controlled in the 0.5N-m.
3. maximum astronomical telescope rollig friction transmission rotational axis torsion angle dynamic correction system according to claim 1 is characterized in that, the rolling bearing that rotation strong point place adopts, and its friction torque is about 0.2N-m.
4. maximum astronomical telescope rollig friction transmission rotational axis torsion angle dynamic correction system according to claim 1 is characterized in that various moment of frictions are little in the lever balance structure, and its value is 1/10th of axial thrust load moment.
5. maximum astronomical telescope rollig friction transmission rotational axis torsion angle dynamic correction system according to claim 1 is characterized in that described length gauge is arranged on the right side of damper weight.
6. according to the described maximum astronomical telescope rollig friction transmission rotational axis torsion angle dynamic correction system of one of claim 1～5, it is characterized in that, the steel ball of adjusting mechanism at ordinary times be connected gap width between the lever in 2 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810020722 CN101231386B (en) | 2008-02-22 | 2008-02-22 | System for dynamically correcting maximum astronomical telescope rollig friction transmission rotational axis torsion angle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810020722 CN101231386B (en) | 2008-02-22 | 2008-02-22 | System for dynamically correcting maximum astronomical telescope rollig friction transmission rotational axis torsion angle |
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| CN101231386A true CN101231386A (en) | 2008-07-30 |
| CN101231386B CN101231386B (en) | 2010-08-04 |
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| CN 200810020722 Expired - Fee Related CN101231386B (en) | 2008-02-22 | 2008-02-22 | System for dynamically correcting maximum astronomical telescope rollig friction transmission rotational axis torsion angle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789242A (en) * | 2012-09-03 | 2012-11-21 | 中国科学院国家天文台南京天文光学技术研究所 | Control system for realizing nonlinear interference compensation of torsion angle of astronomical telescope |
| CN105425618A (en) * | 2015-10-26 | 2016-03-23 | 中国科学院光电技术研究所 | Implementation method of software framework applicable to primary mirror control system with active support technology |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778904B (en) * | 2012-07-25 | 2015-05-20 | 中国科学院国家天文台南京天文光学技术研究所 | Control method and equipment for regulating positive pressure between main friction wheel and auxiliary friction wheel of astronomical telescope |
-
2008
- 2008-02-22 CN CN 200810020722 patent/CN101231386B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789242A (en) * | 2012-09-03 | 2012-11-21 | 中国科学院国家天文台南京天文光学技术研究所 | Control system for realizing nonlinear interference compensation of torsion angle of astronomical telescope |
| WO2014032464A1 (en) * | 2012-09-03 | 2014-03-06 | 中国科学院国家天文台南京天文光学技术研究所 | Control system for implementing nonlinear interference compensation for torsion angle of astronomical telescope |
| US9599809B2 (en) | 2012-09-03 | 2017-03-21 | Nanjing Institute Of Astronomical Optics & Technology, Chinese Academy Of Sciences | Control system for implementing non-linear interference compensation for torsion angle of astronomical telescope |
| CN105425618A (en) * | 2015-10-26 | 2016-03-23 | 中国科学院光电技术研究所 | Implementation method of software framework applicable to primary mirror control system with active support technology |
| CN105425618B (en) * | 2015-10-26 | 2018-04-03 | 中国科学院光电技术研究所 | Implementation method of software framework applicable to primary mirror control system with active support technology |
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| CN101231386B (en) | 2010-08-04 |
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