阅读说明：本技术 一种具有偏心补偿功能的直线运动机构 (Linear motion mechanism with eccentric compensation function ) 是由 娄雪峰 贾清虎 李莉 赵泉 于 2019-10-09 设计创作，主要内容包括：本发明涉及一种具有偏心补偿功能的直线运动机构,包括运动镜组、驱动单元、导向机构和柔性连接环节四个部分。驱动单元与运动镜组的连接位置设置有柔性连接环节,间接驱动运动镜组,以补偿驱动单元相对导向机构运动方向的倾斜,避免结构在运动中出现卡滞；同时,减小驱动单元因偏心对运动镜组产生额外的扭转力,提高运动镜组光轴的动态稳定性。(The invention relates to a linear motion mechanism with an eccentric compensation function, which comprises a motion lens group, a driving unit, a guide mechanism and a flexible connecting link. A flexible connecting link is arranged at the connecting position of the driving unit and the moving lens group, and indirectly drives the moving lens group to compensate the inclination of the driving unit relative to the moving direction of the guide mechanism, so that the structure is prevented from being blocked in movement; meanwhile, the extra torsional force of the driving unit on the moving lens group due to eccentricity is reduced, and the dynamic stability of the optical axis of the moving lens group is improved.)

1. A linear motion mechanism with an eccentric compensation function is characterized by comprising a motion lens group (1), a driving unit (2), a guide mechanism (3) and a flexible connecting link (4); the moving lens group (1) is rigidly fixed on the guide mechanism (3); the moving lens group (1) consists of a plurality of visible light and infrared optical lenses; the guide mechanism (3) consists of a pair of precision ball linear guide rails, the allowable installation height deviation of the guide mechanism and the precision ball linear guide rails is 7 micrometers, and the traveling precision is 3 micrometers; a flexible connecting link (4) is arranged at the joint of the driving unit (2) and the moving lens group (1), and the driving unit (2) drives the moving lens group (1) to realize the linear movement function through the flexible connecting link (4); the flexible connection link (4) include wave spring (5), spacing sleeve (6), spacing retaining ring (7) and lock nut (8), spacing sleeve (6) suit is in the actuating lever outside of drive unit (2), the connecting hole cover on the motion mirror group (1) is in the spacing sleeve (6) outside, set up two wave spring (5) of equal rigidity, equidimension in connecting hole both sides, be equipped with spacing retaining ring (7) in the one end of spacing sleeve (6), lock nut (8) locking is used in spacing retaining ring (7).

2. The linear motion mechanism with eccentricity compensation function according to claim 1, wherein the wave spring (5) is made of 60Si2MnA, and has 3 wave peaks, a cross-sectional thickness of 0.4mm, a wave height of 0.5mm, and a spring compression amount of 0.15mm in a pre-tensioned state.

3. The linear motion mechanism with the eccentric compensation function according to claim 1, wherein the limiting sleeve (6), the limiting retainer ring (7) and the locking nut (8) are made of steel.

Technical Field

The invention belongs to the technical field of precise linear transmission, and particularly relates to a linear motion mechanism with an eccentric compensation function.

Background

In the photoelectric system, the linear motion mechanism of the optical lens group is widely applied, the walking linear precision of the optical lens group determines the imaging quality of the photoelectric equipment, and the walking linear precision of the optical lens group is mainly determined by the guide mechanism and the driving unit. Therefore, the reasonable design structure ensures the accurate consistency of the motion direction of the driving unit and the guide mechanism, enables the mechanism to run smoothly, and effectively reduces the influence of extra torsional force generated by the eccentricity of the driving unit on the optical axis of the moving lens group.

At present, a linear motion mechanism of an optical lens group mostly adopts a mode of rigidly connecting a driving unit and a moving lens group, but the mode has the following defects:

1. because the linear motor driving rod has poor walking linearity and is difficult to be accurately consistent with the motion direction of the linear guide rail, the mechanism is blocked due to excessive eccentricity, and the optical axis of the lens group is influenced by extra torsional force generated by eccentricity;

2. the linear motor driving rod can shake during movement, and the rigid connection can be directly transmitted to the moving mirror body, so that the stability of the optical axis of the mirror body is influenced;

3. due to the fact that the linear motor driving rod is not matched with the lens base, when the external environment temperature changes, the optical axis of the moving lens group is difficult to avoid being influenced.

Disclosure of Invention

Technical problem to be solved

In order to solve the problem that the existing linear motion mechanism is difficult to compensate the eccentricity of a linear motor driving rod relative to the motion direction of a precise linear guide rail, the invention provides a linear motion mechanism with an eccentricity compensation function, which is characterized in that the motion inclination of the linear motor driving rod in a compensation driving unit is reduced, and the influence of the eccentricity of the linear motor driving rod on the optical performance of a moving lens group is reduced.

Technical scheme

A linear motion mechanism with an eccentric compensation function is characterized by comprising a motion lens group, a driving unit, a guide mechanism and a flexible connecting link; the moving lens group is rigidly fixed on the guide mechanism; the moving lens group consists of a plurality of visible light and infrared optical lenses; the guide mechanism consists of a pair of precision ball linear guide rails, the allowable installation height deviation of the guide mechanism and the precision ball linear guide rails is 7 micrometers, and the walking precision is 3 micrometers; a flexible connecting link is arranged at the joint of the driving unit and the moving lens group, and the driving unit drives the moving lens group to realize the linear movement function through the flexible connecting link; the flexible connection link include wave spring, spacing sleeve, spacing retaining ring and lock nut, spacing sleeve suit is in the actuating lever outside of drive unit, the connecting hole cover on the moving mirror group is in the spacing sleeve outside, set up two wave springs of rigidity such as the same, equidimension in connecting hole both sides, be equipped with spacing retaining ring in spacing telescopic one end, spacing retaining ring uses lock nut to lock.

The material of the wave spring is 60Si2MnA, 3 wave crests are arranged, the thickness of the cross section is 0.4mm, the wave height is 0.5mm, and the spring compression amount in a pre-tightening state is 0.15 mm.

The limiting sleeve, the limiting retainer ring and the locking nut are all made of steel.

Advantageous effects

The invention provides a linear motion mechanism with an eccentric compensation function, which comprises a motion lens group, a driving unit, a guide mechanism and a flexible connecting link. A flexible connecting link is arranged at the connecting position of the driving unit and the moving lens group, and indirectly drives the moving lens group to compensate the inclination of the driving unit relative to the moving direction of the guide mechanism, so that the structure is prevented from being blocked in movement; meanwhile, the extra torsional force of the driving unit on the moving lens group due to eccentricity is reduced, and the dynamic stability of the optical axis of the moving lens group is improved.

The invention can effectively compensate the walking eccentricity of the driving rod of the linear stepping motor, reduce the influence of the optical performance of the moving lens group of the driving unit, and has the advantages of good environmental adaptability, easy processing and assembly and the like.

Drawings

FIG. 1 is a schematic view of a linear motion mechanism according to the present invention;

FIG. 2 is a cross-sectional view of a flexible link of the present invention;

FIG. 3 is a schematic view of a wave spring of the present invention;

fig. 4 is a design size diagram of the wave spring of the present invention.

The reference numerals in the figures denote:

1-a kinematic lens group; 2-a drive unit; 3-a guiding mechanism; 4-flexible connection link; 5-wave spring; 6-a limiting sleeve; 7-limiting retainer ring; 8-locking the nut.

Detailed Description

The invention will now be further described with reference to the following examples and drawings:

a linear motion mechanism with an eccentricity compensation function comprises a motion lens group, a driving unit, a guide mechanism and a flexible connection link, wherein the flexible connection link comprises two wave springs, and the motion eccentricity of a driving rod of the driving unit is compensated through the elastic deformation of the wave springs.

The moving lens group can be composed of a plurality of visible light and infrared optical lenses, and the precision among the lenses is adjusted in place in the unit moving lens group 1.

The moving mirror group is rigidly fixed on two precision ball linear guide rails in the guide mechanism, the allowable installation height deviation of the moving mirror group and the precision of the walking linear guide rails is 7 mu m, the precision of the walking linear guide rails is 3 mu m, and the linear walking precision of the moving mirror group superior to 10' can be ensured.

Because the linear stepping motor in the driving unit has poor walking linearity, the flexible connecting ring is arranged at the joint of the driving unit and the moving lens group, so that the eccentricity of the driving rod of the stepping motor can be effectively compensated. A limiting sleeve is designed in the flexible connection link, the limiting sleeve is sleeved on a driving rod of the linear motor, the moving mirror group is sleeved on the limiting sleeve, two wave springs with equal size and equal rigidity are arranged on two sides of the limiting sleeve, and the end faces are fixed by locking nuts.

On the basis of the determination of the relative sizes of the connecting hole of the moving lens group and the wave spring, the compression amount of the two wave springs can be accurately controlled by controlling the length of the limiting sleeve, and through calculation and simulation verification, when the compression amount of the wave spring is 0.15mm, the prepressing force of the spring can be ensured to be larger than the resistance force of the moving lens group, and the wave spring can be ensured to compensate the eccentricity of the driving rod of the linear motor through self torsional deformation in clamping stagnation.

In the technical scheme, the wave spring is made of 60Si2MnA, the wave crest at the position 3 is designed, the wave height is 0.5mm, the cross section is rectangular, and the optimal thickness dimension is 0.4mm through simulation verification. The spring compression in the pre-tensioned state is 0.15 mm.

In the technical scheme, the limiting sleeve, the limiting retainer ring and the locking nut are all made of steel, and the stability of the optical axis of the lens group is guaranteed when the external environment temperature changes.

In the technical scheme, the length dimension tolerance of the limiting sleeve 6 is controllable, so that the pre-tightening force of the wave spring can be accurately controlled.

As shown in fig. 1-4, the linear motion mechanism with eccentricity compensation function includes a moving lens group 1, a driving unit 2, a guiding mechanism 3 and a flexible connecting link 4; the moving mirror group 1 is rigidly fixed on the guide mechanism 3, the driving unit 2 drives the moving mirror group 1 to realize the linear movement function by means of the flexible connection link 4, wherein the flexible connection link 4 comprises a wave spring 5, a limiting sleeve 6, a limiting check ring 7 and a locking nut 8.

The moving mirror group is fixed on two linear guide rails through 8M 3 screws, and the linear walking precision superior to 10' of the mirror group is realized through the linear precision and the assembly and adjustment of the linear guide rails.

The driving unit drives the moving lens group to move along the linear guide rail through the driving rod, and a flexible connecting link is arranged at the joint of the moving lens group and the linear guide rail. The flexible connection link is positioned by a limiting sleeve, the limiting sleeve is sleeved outside a driving rod of the linear motor, a connecting hole in the moving lens group is sleeved outside the limiting sleeve, two equal-rigidity equal-size wave springs are arranged on two sides of the connecting hole, the length of the limiting sleeve determines the compression amount of the two wave springs, and the compression amounts of the two wave springs are consistent due to the equal rigidity of the two wave springs.