CN104483743B - A kind of direct-drive type precision micro-displacement actuator for polar region environment - Google Patents
A kind of direct-drive type precision micro-displacement actuator for polar region environment Download PDFInfo
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- CN104483743B CN104483743B CN201510003074.5A CN201510003074A CN104483743B CN 104483743 B CN104483743 B CN 104483743B CN 201510003074 A CN201510003074 A CN 201510003074A CN 104483743 B CN104483743 B CN 104483743B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/183—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors specially adapted for very large mirrors, e.g. for astronomy, or solar concentrators
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Abstract
A kind of direct-drive type precision micro-displacement actuator for polar region environment, it relates to a kind of precision micro-displacement actuator, to solve the problem currently without the support of the large-scale segmented mirror telescope panel being applicable under polar low-temperature environment and governor motion, it includes movement support device, drive mechanism and the gap screw-drive mechanism that disappears；Movement support device includes flexible shaft, end cap, housing and bottom, and housing is the housing of open at both ends, and end cap and bottom cover the two ends being contained in housing respectively；Drive mechanism includes yielding coupling, connecting plate for electric motor and stepper motor, and the gap that disappears screw-drive mechanism includes feather key, drive rod, transmission nut, spring spool, screw rod, preloading spring, the gap that disappears nut and anti-turn screw.The present invention is for multi-point support and the sub-mirror board adjusting split minute surface astronomical telescope.
Description
Technical field
The present invention relates to a kind of precision micro-displacement actuator, be specifically related to a kind of for arctic regions split minute surface astronomical telescope
Direct-drive type precision micro-displacement actuator, this mechanical micro-displacement actuator works in groups, be mainly used in multi-point support and adjust split
The sub-mirror board of minute surface astronomical telescope, belongs to segmented mirror active optics technical field.Meanwhile, it is equally applicable for low temperature bar
The occasions such as the precision micro-displacement mechanism under part.
Background technology
With astronomical development, astronomer needs more bigbore astronomical telescope detection dark matter, dark energy even
Outer life etc..But, there is many bottlenecks in the bigbore evolution of increasing in the astronomical telescope of single minute surface, is therefore born
Active optics technology, segmented mirror active optics technology, as one of active optics technology branch, can solve effectively
Certainly this problem.Segmented mirror active optics technology can correct telescope primary mirror in manufacture, installation, gravitational field, temperature field
The mirror shape error of middle generation, makes numerous sub-mirror board piece together the primary mirror with certain surface figure accuracy, needs during this
To carry out Precision measurement to the main mirror face of astronomical telescope, then carry out the pose adjustment of precision to the sub-mirror board of primary mirror,
Mechanical micro-displacement actuator is support and the governor motion of sub-mirror board, can carry out the pose adjustment of multiple free degree with counter plate, its
Play accuracy compensation effect in segmented mirror active optics technology.
Astronomical telescope is in running, and primary mirror can be acted on by gravitational field, wind load, temperature loading etc., makes the face of primary mirror
Shape precision is affected, and for making primary mirror have certain surface figure accuracy in running all the time, mechanical micro-displacement actuator must have
Have grade stroke, micro/nano level high-resolution, heavy load ability, high rigidity, high repetitive positioning accuracy, high stability etc.
Feature.
At present, the precision stepper motor of the many employings of the mechanical micro-displacement actuator of research both at home and abroad, piezoelectric ceramic actuator, ultrasonic wave electricity
Machine, magnetic telescopic driver etc. are as driving element, and piezoelectric ceramics, supersonic motor and magnetostriction materials often exist
The problems such as output displacement is non-linear, sluggish, load capacity is little so that its application is restricted.And stepper motor economy is commonly used,
There is no accumulated error, and A wide selection of colours and designs, technology maturation, use electricity micro-stepping control can export less step angle, coordinate
Accurate machine driving can be stablized, export minimum displacement linearly.
Meanwhile, with the exploration to the South Pole for the mankind, high altitude localities, Antarctica is proved to be astronomy best on the earth
Observation place, has numerous advantage: can carry out long Continuous Observation in terms of astronomical observation；Moisture content is low, air
Very thin；Low light scattering and atmospheric transmittance are high；Very cold drying；Low infrared background；Atmospheric scinillation is low；Width etc. are dizzy
Angle and coherence time are long.All these advantage makes the South Pole become the most attracting optical/infrared astronomy observation ground on the earth
Point.Countries in the world proposed the telescope plan of multiple South Pole in succession in recent years.In view of arctic regions bad environments, minimum gas
Temperature can reach subzero 80 degree to 90 degree, and can avenge with high wind, and this makes for arctic regions split minute surface astronomical telescope
The design of mechanical micro-displacement actuator be different from the mechanical micro-displacement actuator in other environment.Low in view of polar region environment temperature, microbit
Displacement actuator compact conformation to be had, volume is little, and profile is more regular, can be prevented effectively from accumulated snow, low temperature resistant, has one
Fixed sealing, the feature such as anti-wind and snow erosion；The shortcoming such as big in view of arctic regions transport difficulty, expense is high, actuator is also
Light weight to be had, it is simple to the feature of transport；Actuator must also have driving effectively simultaneously, output accuracy advantages of higher,
There is not the shortcomings such as low speed jerking motion, sluggishness, backlash.
With gradually going deep into of South Pole astronomy research, more bigbore segmented mirror active light will be built in the whole world in arctic regions
Learn telescope.When the time comes, increasing due to sub-minute surface plate number, the demand of low temperature mechanical micro-displacement actuator will be increased dramatically.At present,
The domestic commercially produced product not also being related to, so that China accelerates the development of low temperature mechanical micro-displacement actuator, grasps it as early as possible
Independent intellectual property right, improves the large-scale segmented mirror active optics telescope manufacturing capacity of self, and building, arctic regions is large-scale
The telescopical tide of segmented mirror is taken the good opportunity, and then promotes the astronomical development in the South Pole.
Content of the invention
The present invention is for solving the support currently without the large-scale segmented mirror telescope panel being applicable under polar low-temperature environment
With the problem of governor motion, and then provide a kind of direct-drive type precision micro-displacement actuator for polar region environment.
The present invention solves that the problems referred to above adopt the technical scheme that: a kind of direct-drive type precision micro-displacement for polar region environment promotees
Dynamic device includes movement support device, drive mechanism and the gap screw-drive mechanism that disappears；
Movement support device includes flexible shaft, end cap, housing and bottom, and housing is the housing of open at both ends, end cap and bottom
Lid is contained in the two ends of housing respectively；Movement support device also includes that bearing block, bearing (ball) cover, deep groove ball bearing and axle are elastic
Back-up ring；Bearing block is arranged on the middle part in housing, and bearing (ball) cover is arranged on bearing block, and deep groove ball bearing is arranged on bearing block
With between bearing (ball) cover, the inner ring of deep groove ball bearing is fixed on screw rod by circlip for shaft；
Drive mechanism includes yielding coupling, connecting plate for electric motor and stepper motor, and connecting plate for electric motor is arranged in housing, stepping
Motor is arranged on connecting plate for electric motor, and the output shaft of stepper motor is horizontally disposed, and the output shaft of stepper motor is provided with elasticity
Shaft coupling；
The gap that disappears screw-drive mechanism includes feather key, drive rod, transmission nut, spring spool, screw rod, preloading spring, disappears
Gap nut and anti-turn screw；Drive rod pass through end cap and the two matched in clearance, feather key be arranged on drive rod and with on end cap
Keyway coordinate, one end of drive rod is connected with flexible shaft, and the other end of drive rod is connected with transmission nut, screw rod and elasticity
Shaft coupling connects；Transmission nut is mainly made up of the drive flange and drive socket being formed integrally, and the gap that disappears nut is mainly by making
Disappear gap flange and the gap sleeve composition that disappears of one, is machined with the screwed hole matching with screw flight in drive socket, disappear gap
Be machined with the screwed hole matching with screw flight in sleeve, drive socket and the gap sleeve that disappears just to arrangement, transmission nut and disappearing
Gap nut is screwed on screw rod respectively, and preloading spring is compressed in drive flange and disappears between gap flange, and spring spool is set in pre-
On tight spring, spring spool is connected with transmission nut, and anti-turn screw passes through the counterbore of processing on the gap flange that disappears and is fixed on spring
On sleeve；
The screw thread of transmission nut, the screw thread of the gap that disappears nut and screw flight are accurate trapezoidal thread, have small spiral shell
Away from pitch is 0.1mm-0.2mm.
The invention has the beneficial effects as follows:
1st, the present invention uses and disappears gap screw-drive mechanism, have compact conformation, output displacement control accuracy high, without backhaul between
Gap, cut off self-lock, advantage that stability is strong, the high precision position and posture being capable of the sub-mirror board of large-scale segmented mirror telescope is adjusted
Whole.
2nd, the pretightning force that the preloading spring of the present invention provides can effectively eliminate the drive gap of worm drive, improves the gap spiral that disappears
The output accuracy of transmission mechanism, coordinates the high pulling torque stepper motor of electricity micro-stepping control, and its unidirectional output displacement precision is micro-less than 1
Rice, i.e. ensure that be better than 1 micron of stepping accuracy straight-line displacement output, simultaneously its load force be more than 70N, stroke more than ±
1.5mm, meets segmented mirror face shape and reaches optical imagery requirement.
3rd, flexible operation of the present invention, be easy to manufacture, its volume is little simultaneously, lightweight, it is simple under the specific condition of polar region
Install and long-distance transport.
4th, the actuator airtight cavity of the end cap of the present invention, housing and bottom composition is cylindric, can effectively prevent accumulated snow,
Internal mechanical driving parts is avoided to suffer the erosion that arctic regions high wind is avenged so that actuator can be real under the adverse circumstances of polar region
Now very high kinematic accuracy and the stability of a system, be particularly suited under the particular surroundings of polar region using.
5th, the movement support device of the present invention is easy to be attached with sub-mirror board, and by disappearing, gap screw-drive mechanism realizes large-scale
Segmented mirror is looked in the distance the regulation of mirror mirror board attitude.
6th, the present invention uses low temperature extreme boundary lubrication grease lubrication, ensure that actuator is stable at polar region extremely frigid zones, low abrasion ground
Run.
Brief description
Fig. 1 is the front view structure schematic diagram of the present invention, and Fig. 2 is the sectional view of the stereochemical structure of the present invention, and Fig. 3 is the present invention
The gap screw-drive mechanism schematic diagram that disappears.
Detailed description of the invention
Detailed description of the invention one: combine Fig. 1, Fig. 2 and Fig. 3 explanation, a kind of directly driving for polar region environment of present embodiment
Formula precision micro-displacement actuator includes movement support device, drive mechanism and the gap screw-drive mechanism that disappears；
Movement support device includes flexible shaft the 1st, end cap the 10th, housing 18 and bottom 19, and housing 18 is the housing of open at both ends,
End cap 10 and bottom 19 cover the two ends being contained in housing 18 respectively；
Drive mechanism includes yielding coupling the 17th, connecting plate for electric motor 8 and stepper motor 9, and connecting plate for electric motor 8 is arranged on housing
In 18, stepper motor 9 is arranged on connecting plate for electric motor 8, and the output shaft of stepper motor 9 is horizontally disposed, stepper motor 9
Yielding coupling 17 is installed on output shaft；
The gap that disappears screw-drive mechanism includes feather key the 2nd, drive rod the 3rd, transmission nut the 4th, spring spool the 5th, screw rod the 11st, pretension
The 12nd, spring disappears gap nut 13 and anti-turn screw 14；Drive rod 3 passes through end cap 10 and the two matched in clearance, and feather key 2 is pacified
Being contained on drive rod 3 and coordinating with the keyway on end cap 10, one end of drive rod 3 is connected with flexible shaft 1, drive rod 3
The other end is connected with transmission nut 4, and screw rod 11 is connected with yielding coupling 17；
Transmission nut 4 is main to be made up of the drive flange 4-1 being formed integrally and drive socket 4-2, the gap that disappears nut 13 main by
Disappear gap flange 13-1 and the gap sleeve 13-2 composition that disappears being formed integrally, is machined with the screw thread with screw rod 11 in drive socket 4-2
The screwed hole matching, is machined with the screwed hole matching with screw rod 11 screw thread, drive socket 4-2 in the gap that disappears sleeve 13-2
With the gap sleeve 13-2 that disappears just to arrangement, transmission nut 4 and the gap nut 13 that disappears are screwed on screw rod 11 respectively, preloading spring 12
Being compressed in drive flange 4-1 and disappearing between gap flange 13-1, spring spool 5 is set on preloading spring 12, spring spool 5
Being connected with transmission nut 4, anti-turn screw 14 passes through the counterbore of processing on the gap flange 13-1 that disappears and is fixed on spring spool 5.
The feather key 2 of present embodiment is installed on drive rod 3, and coordinates with the keyway on end cap 10, and flexible shaft is the 1st, simultaneously
The 4th, drive rod the 3rd, transmission nut disappears gap nut 13 and spring spool 5 connects into an entirety.It is arranged such, can stop
Flexible shaft the 1st, drive rod the 3rd, transmission nut the 4th, spring spool 5 and the gap nut 13 that disappears rotate around own axes, and can guarantee that and drive
Lever 3 can axially move.One end of the screw rod 11 of present embodiment is stretched in drive rod 3, screw rod 11 another
One end is connected with yielding coupling 17.
The stepper motor 9 of present embodiment uses low temperature resistant stepper motor, and stepper motor 9 is arranged on connecting plate for electric motor 8,
Connecting plate for electric motor 8 is arranged on housing 18.It is arranged such, stepper motor 9 can be fixed, and prevent its stator around self axle
Line rotates.
The flexible shaft 1 of present embodiment is installed on drive rod 3, and the other end of flexible shaft 1 is connected with sub-mirror board, so
It is capable of when many actuators support single sub-mirror board jointly producing the rotary freedom of little yardstick.
Detailed description of the invention two: combine Fig. 1-Fig. 2 explanation, the screw thread of the transmission nut 4 of present embodiment, the gap that disappears nut 13
Screw thread and the screw thread of screw rod 11 be accurate trapezoidal thread, there is small pitch, pitch is 0.1mm-0.2mm.
The screw rod of present embodiment the 11st, transmission nut 4 and the gap nut 13 that disappears all use accurate trapezoidal thread, and it has small
Pitch, it is ensured that stepper motor 9 every revolution transmission nut 4 exports small displacement, coordinates the step of electricity micro-stepping control
Entering motor, its unidirectional output displacement precision is less than 1 micron.Other are identical with detailed description of the invention one.
Detailed description of the invention three: combine Fig. 1-Fig. 2 explanation, between transmission nut 4 and screw rod 11, the gap that disappears nut 13 and spiral shell
Low temperature extreme boundary lubrication lipid layer is all scribbled between bar 11 and between drive rod 3 and end cap 10.
In present embodiment, between transmission nut 4 and screw rod 11, between the gap that disappears nut 13 and screw rod 11 and drive rod 3
And all scribble low temperature extreme pressure grease between end cap 10, drive rod the 3rd, end cap the 10th, screw rod the 11st, transmission nut 4 can be reduced
With the abrasion of the gap nut 13 that disappears, and ensure actuator output relatively large load power, still have under polar low-temperature specific condition good
Good lubricant effect, actuator can be stablized at polar region extremely frigid zones, run to low abrasion.Other with detailed description of the invention one or
Two is identical.
Detailed description of the invention four: combine Fig. 3 explanation, the inner face of the gap flange 13-1 that disappears of present embodiment and with this inner face
Adjacent axial gap L between spring spool 5 outer face is 0.4mm-0.6mm, the counterbore anchor ring of the gap that disappears flange 13-1 with
Axial gap H between anti-turn screw 14 head inner ring surface is 0.4mm-0.6mm.I.e. the anti-turn screw 14 of present embodiment is only
Limit the rotation around own axes for the gap nut 13 that disappears, use preloading spring 12 by transmission nut 4 and gap nut 13 edge that disappears simultaneously
Axial push-tight, makes preloading more than 70N of preloading spring 12, the carrying tooth side of transmission nut 4 so can be made to be always left tooth
Side, the carrying tooth side of screw rod 11 is always right tooth side, thus eliminates the drive gap of worm drive, and reaches backlash compensation
Effect.Other are identical with detailed description of the invention one.
Detailed description of the invention five: combining Fig. 1 and Fig. 2 explanation, the 6th, the movement support device of present embodiment also includes bearing block
Bearing (ball) cover the 7th, deep groove ball bearing 15 and circlip for shaft 16；Bearing block 6 is arranged on the middle part in housing 18, bearing
End cap 7 is arranged on bearing block 6, and deep groove ball bearing 15 is arranged between bearing block 6 and bearing (ball) cover 7, deep groove ball bearing
The inner ring of 15 is fixed on screw rod 11 by circlip for shaft 16.The deep groove ball bearing 15 of present embodiment uses low temperature resistant
Bearing, deep groove ball bearing 15 at radial and axial studdle 11, and can ensure that screw rod 11 can be at stepper motor 9
Rotate around own axes under drive.
Detailed description of the invention six: combine Fig. 1 and Fig. 2 explanation, the gap between the drive rod 3 of present embodiment and end cap 10
For 1-35 μm.It is matched in clearance between the drive rod 3 of present embodiment and end cap 10, use the gap of accurate sliding bearing
Coordinate, it is ensured that maximal clearance is 35 μm, is arranged such, and can play a supporting role drive rod 3, and facilitate implementation
The smooth and easy motion of drive rod 3, it is ensured that integrally-built sealing.Other compositions and annexation and detailed description of the invention one phase
With.
Detailed description of the invention seven: combine Fig. 1-Fig. 2 explanation, described in present embodiment, housing 18 is cylindrical housings.This enforcement
The housing 18 of mode is designed as cylinder.It is arranged such, it is simple to coordinate with whole telescope, subtract to the full extent simultaneously
Little windage.End cap 10 and bottom 19 lid are loaded on housing 18 both sides, make housing have certain sealing, are prevented from high wind snow
Corrode.Other are identical with detailed description of the invention one.
Detailed description of the invention eight: combining Fig. 1-Fig. 2 explanation, the stepper motor 9 of present embodiment uses low temperature resistant stepper motor,
Deep groove ball bearing 15 uses low temperature resistant stainless steel bearing, and other parts all use stainless steel homogeneous material.It is arranged such, can protect
Under card cryogenic conditions, major part parts have identical temperature deformation, and can keep zero under the long-time low temperature environment in polar region
The mechanical performance of part, it is achieved kinematic accuracy very high under cryogenic and the stability of a system.Other are with detailed description of the invention one
Identical.
Operation principle
Starting stepper motor 9, power is directly passed to screw rod 11 by yielding coupling 17 by stepper motor 9, and drives spiral shell
Bar 11 rotates, and when screw rod 11 rotates, transmission nut 4 produces micro-displacement, and transmission nut 4, when producing displacement, promotes
Drive rod 3 is to axially movable, and drive rod 3 drives again flexible shaft 1 to move linearly, it is achieved Micro-displacement Driving.
Claims (2)
1. the direct-drive type precision micro-displacement actuator for polar region environment, it is characterised in that: it include movement support device,
Drive mechanism and the gap screw-drive mechanism that disappears；
Movement support device includes flexible shaft (1), end cap (10), housing (18) and bottom (19), and housing (18) is two
Uncovered housing, end cap (10) and bottom (19) is held to cover the two ends being contained in housing (18) respectively；
Movement support device also includes bearing block (6), bearing (ball) cover (7), deep groove ball bearing (15) and circlip for shaft (16)；
Bearing block (6) is arranged on the middle part in housing (18), and bearing (ball) cover (7) is arranged on bearing block (6), deep groove ball bearing
(15) being arranged between bearing block (6) and bearing (ball) cover (7), the inner ring of deep groove ball bearing (15) is by axle elasticity gear
Circle (16) is fixed on screw rod (11)；
Drive mechanism includes yielding coupling (17), connecting plate for electric motor (8) and stepper motor (9), and connecting plate for electric motor (8) is pacified
Being contained in housing (18), stepper motor (9) is arranged on connecting plate for electric motor (8), the output shaft level of stepper motor (9)
Arrange, the output shaft of stepper motor (9) is provided with yielding coupling (17)；
The gap that disappears screw-drive mechanism includes feather key (2), drive rod (3), transmission nut (4), spring spool (5), screw rod
(11), preloading spring (12), the gap that disappears nut (13) and anti-turn screw (14)；Drive rod (3) pass through end cap (10) and
The two matched in clearance, feather key (2) is arranged on drive rod (3) and above and coordinates with the keyway on end cap (10), drive rod (3)
One end be connected with flexible shaft (1), the other end of drive rod (3) is connected with transmission nut (4), screw rod (11) with elastic
Shaft coupling (17) connects；
Transmission nut (4) is mainly made up of the drive flange (4-1) being formed integrally and drive socket (4-2), the gap that disappears nut (13)
Mainly by be formed integrally disappear gap flange (13-1) and the gap sleeve (13-2) that disappears forms, be machined with in drive socket (4-2) and
The screwed hole that the screw thread of screw rod (11) matches, is machined with in the gap that disappears sleeve (13-2) and matches with screw rod (11) screw thread
Screwed hole, drive socket (4-2) and the gap sleeve (13-2) that disappears are just to arrangement, transmission nut (4) and the gap nut (13) that disappears
Being screwed in respectively on screw rod (11), preloading spring (12) is compressed in drive flange (4-1) and disappears between gap flange (13-1),
Spring spool (5) is set on preloading spring (12), and spring spool (5) is connected with transmission nut (4), anti-turn screw (14)
Pass through the counterbore of the upper processing of the gap flange (13-1) that disappears and be fixed on spring spool (5)；
The screw thread of the screw thread of transmission nut (4), the screw thread of the gap that disappears nut (13) and screw rod (11) is accurate trapezoidal thread,
Having small pitch, pitch is 0.1mm-0.2mm.
2. a kind of direct-drive type precision micro-displacement actuator for polar region environment according to claim 1, it is characterised in that: disappear
Axial gap (L) between the inner face of gap flange (13-1) and spring spool (5) outer face adjacent with this inner face is
0.4mm-0.6mm, the axial gap (H) between the counterbore anchor ring of the gap that disappears flange (13-1) and anti-turn screw (14) head inner ring surface
For 0.4mm-0.6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510003074.5A CN104483743B (en) | 2015-01-05 | 2015-01-05 | A kind of direct-drive type precision micro-displacement actuator for polar region environment |
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|---|---|---|---|
| CN201510003074.5A CN104483743B (en) | 2015-01-05 | 2015-01-05 | A kind of direct-drive type precision micro-displacement actuator for polar region environment |
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| CN104483743B true CN104483743B (en) | 2016-10-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107991901B (en) * | 2017-12-04 | 2020-12-25 | 中国科学院国家天文台南京天文光学技术研究所 | Voice coil motor displacement actuator simulation platform |
| CN111380092B (en) * | 2018-12-28 | 2022-05-17 | 宁波方太厨具有限公司 | Side-draft range hood and gap adjusting method thereof |
| CN110133820B (en) * | 2019-05-17 | 2021-03-05 | 中国科学院国家天文台南京天文光学技术研究所 | Nanometer-scale precision displacement actuator of large-scale spliced mirror surface optical telescope |
| CN111061031B (en) * | 2019-11-26 | 2021-12-07 | 北京空间机电研究所 | Space closed type flexible precision adjusting device and assembling method thereof |
| CN111426391A (en) * | 2020-04-02 | 2020-07-17 | 济南和普威视光电技术有限公司 | Double-view-field infrared thermal imaging lens and view field switching method |
| CN117741904B (en) * | 2024-02-19 | 2024-04-16 | 中国科学院长春光学精密机械与物理研究所 | Bolt pre-tightening device for reflecting mirror assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2161014Y (en) * | 1992-04-22 | 1994-04-06 | 电子工业部第四十五研究所 | Micro-displacement driver |
| DE19500613A1 (en) * | 1994-01-26 | 1995-07-27 | Zeiss Carl Fa | Point supporting device partic. for large mirror of telescope |
| CN201037529Y (en) * | 2007-01-18 | 2008-03-19 | 赵勇 | Prepressing automatic return difference eliminating clearance common screw-and-nut pair |
| CN201475273U (en) * | 2009-08-25 | 2010-05-19 | 北京普析通用仪器有限责任公司 | Clearance elimination nut |
| CN104049335B (en) * | 2014-06-18 | 2016-04-20 | 哈尔滨工业大学 | The precision micro-displacement actuator used under a kind of polar low-temperature environment |
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