CN105204159B - Reduce stress deformation's high accuracy pendulum mirror structure - Google Patents

Abstract

The invention discloses a high-precision swing mirror structure for reducing stress and deformation, which includes a base, a swing mirror, a swing mirror seat and two rotating shafts, the two rotating shafts are coaxial, two pillars are arranged on the base, and two There are through holes at the equal height positions on the two pillars; the swing mirror is fixed on the swing mirror seat; the two rotating shafts are respectively a left rotating shaft and a right rotating shaft, and the left rotating shaft and the right rotating shaft are respectively installed in a through hole of the pillar; Both the rotating shaft and the right rotating shaft include a pin shaft and a rolling bearing sleeved on the pin shaft. A connecting plate is provided at the opposite end of the two pin shafts, and a connecting portion is provided at the opposite ends of the swing mirror seat. The connecting portion is respectively connected to the left rotating shaft. The connecting plate is fixedly connected with the connecting plate of the right rotating shaft; stress relief grooves are arranged on the connecting plate and the connecting part. The invention does not increase production and assembly costs, and has the advantages of simple and convenient processing, low cost, high rotation precision and high reliability.

Description

A high-precision pendulum mirror structure with reduced stress and deformation

technical field

The invention relates to the field of high-precision oscillating mirror structures, in particular to a high-precision scanning imaging camera oscillating mirror under the influence of the environment.

Background technique

When a general scanning imaging camera is working, objects with different viewing angles enter the optical system through the rotation of the oscillating mirror to complete the scanning imaging function. The schematic diagram of the optical path is shown in Figure 1. Imaging function, when the camera is working, the swing mirror needs to rotate within a certain angle range, that is, the α angle changes within a certain range. It can be seen from Figure 1 that in order for the scanning imaging camera to complete high-quality imaging functions, it is necessary to ensure high rotation accuracy of the swing mirror, and the installation structure of the swing mirror must have sufficient ability to resist stress and deformation caused by environmental loads.

In the prior art, the oscillating mirror of a general scanning imaging camera must ensure that the mirror surface is parallel or coplanar with the rotation axis direction during the assembly and adjustment stage, and the normal direction perpendicular to the rotation axis of the mirror surface is parallel or coplanar with the optical axis of the rear optical system, and the rotation axis of the oscillating mirror It is perpendicular to the optical axis of the rear optical system. The above requirements can be easily met during the debugging process, but when the camera is actually working, due to changes in environmental conditions such as temperature, stress will inevitably occur at the connection between the pendulum mirror and structural parts. On the other hand, it will reduce the precision of the rotating shaft, which will cause the relative positional relationship between the oscillating mirror and its rotating shaft and the optical axis of the rear optical system to change, thereby affecting the imaging quality. Therefore, to ensure the imaging accuracy of the scanning imaging camera under complex working conditions, it is necessary to design a high-precision swing mirror structure that can reduce stress and deformation.

Contents of the invention

Aiming at the many problems caused by the swinging mirror shaft of the ordinary scanning imaging camera in the prior art under environmental conditions such as temperature changes, and considering the complex working conditions and high imaging requirements when it works on the vehicle and airborne platforms, this paper The invention provides a high-precision swing mirror structure that reduces stress and deformation.

Technical scheme of the present invention is as follows:

A high-precision swing mirror structure that reduces stress and deformation, including a base, a swing mirror, a swing mirror seat and two rotating shafts, the two rotating shafts are coaxial, and its special features are:

The base is provided with two pillars, and through holes are provided at equal heights on the two pillars; the swing mirror is fixed on the swing mirror seat; the two rotating shafts are respectively a left rotating shaft and a right rotating shaft, and a left rotating shaft and a right rotating shaft They are respectively installed in a through hole of the pillar; both the left shaft and the right shaft include a pin shaft and a rolling bearing sleeved on the pin shaft, and a connecting plate is provided at the opposite end of the two pin shafts.

The opposite ends of the swing mirror seat are provided with connecting parts, and the connecting parts are respectively fixedly connected with the connecting plate of the left rotating shaft and the connecting plate of the right rotating shaft;

Both the connecting plate and the connecting part are provided with stress relief grooves.

The other ends of the two pin shafts are provided with a threaded connection section; the pin shaft is provided with a stopper and a bearing pressure ring for limiting the rolling bearing, and the rolling bearing is located between the corresponding stopper and the bearing pressure ring; the bearing pressure ring includes the bearing inner Pressure ring and bearing outer pressure ring;

The inner pressure ring of the bearing is sleeved on the threaded connection section of the pin shaft, and is fixedly connected with the pin shaft; the outer pressure ring of the bearing is fixedly connected with the pillar.

A bearing spacer is installed between the two angular contact ball bearings.

Both the connecting plate and the connecting portion are provided with through holes, and the through holes on the connecting plate and the through holes on the connecting portion are connected by screw threads.

A pendulum mirror trimming pad is provided between the connecting portion and the corresponding connecting plate.

The rolling bearing of the left rotating shaft includes two angular contact ball bearings, which are sleeved on the pin shaft back to back, and the rolling bearing of the right rotating shaft is a deep groove ball bearing.

There are three stress relief grooves on the connection plate and the connection portion, two of the three stress relief grooves on the connection plate and the connection portion are arranged horizontally and the other is vertically arranged.

The swing mirror seat includes a picture frame and a bottom plate, the picture frame and the bottom plate are fixedly connected to form a barrel, the swing mirror is embedded in the barrel, the reflection surface of the swing mirror is higher than the barrel or is flush with the barrel, the swing mirror and the swing Buffer glue is filled between the mirror mounts.

The swing mirror seat is adapted to the shape of the swing mirror.

There are a plurality of through holes on the base plate, one of which is located at the center of the base plate, and the rest of the through holes are evenly distributed along the circumference with the center of the base plate as the center; glue injection holes and glue flow grooves are opened on the frame.

The present invention has the following technical effects:

Compared with the prior art, the oscillating mirror structure of the present invention not only has high rotational accuracy, but also can reduce the stress deformation of the structure under certain environmental load conditions, thereby improving the environmental adaptability and stability of the oscillating mirror structure, While ensuring the same rotation accuracy, there is no increase in production and assembly costs, and it has the advantages of simple and convenient processing, low cost, high rotation accuracy, and high reliability.

Description of drawings

Fig. 1 is a schematic diagram of the optical path of a scanning imaging camera;

Fig. 2 is a structural schematic diagram of a high-precision pendulum mirror structure that reduces stress and deformation according to the present invention;

Fig. 3 is a structural cross-sectional view of a high-precision pendulum mirror structure that reduces stress and deformation according to the present invention;

Fig. 4 is the structural representation of base;

Fig. 5 is the structure schematic diagram of swing mirror seat;

Fig. 6 is a structural schematic diagram of the left rotating shaft;

Fig. 7 is a structural schematic diagram of the right rotating shaft;

The marks in the figure are: 1. Base, 2. Swing mirror seat, 3. Swing mirror, 4. Left shaft, 5. Right shaft, 6. Rolling bearing, 7. Bearing outer pressure ring, 8. Bearing inner pressure ring, 9. Bearing spacer, 10 Pendulum mirror trimming pad, 11. Screw, 12. Block, 13. Mirror frame, 14. Bottom plate, 15. Stress relief groove, 16. Connecting part, 17. Connecting plate, 18. Upper pillar The through hole, 19, pillar.

detailed description

The present invention will be further described in detail below in conjunction with the embodiments, and the structural components of the present invention are not limited to the following embodiments.

As shown in Figures 2 to 7, the present invention provides a high-precision swing mirror structure that reduces stress and deformation, including a base 1, a swing mirror 3, a swing mirror seat 2 and two rotating shafts, the base 1 is a U-shaped structure, and the bottom is placed There are connecting holes, the present invention can be fixed on the workbench through the connecting holes; the two rotating shafts are coaxial, and the base is provided with two pillars 19, and through holes are arranged at the equal height positions of the two pillars; The mirror is fixed on the swing mirror seat; the two rotating shafts are respectively the left rotating shaft 4 and the right rotating shaft 5, and the left rotating shaft and the right rotating shaft are respectively installed in a through hole of the pillar; the left rotating shaft and the right rotating shaft both include pin shafts and sleeves On the rolling bearing 6, the opposite end of the two pin shafts is provided with a connecting plate 17;

The opposite ends of the swing mirror seat are provided with connecting parts 16, and the connecting parts are respectively fixedly connected with the connecting plate of the left rotating shaft and the connecting plate of the right rotating shaft;

Stress relief grooves 15 are provided on the connecting plate and the connecting portion. The stress relief grooves are narrow gaps opened on the parts. When the environmental load changes, the width of the stress relief grooves will increase or decrease accordingly. Its design width should be calculated according to relevant theories such as structural mechanics and thermodynamics, that is, within a certain range of environmental load changes, the width of the stress relief groove can not only ensure the mechanical properties of the entire structure, but also ensure that the stress can be minimized. out of shape.

The other ends of the two pin shafts are provided with threaded joints; the pin shafts are provided with stoppers 12 and bearing pressure rings for limiting the rolling bearings, and the rolling bearings are located between the corresponding stoppers and the bearing pressure rings. When freely rotating around the coaxial axis of the through hole on the pillar, the swing mirror can be prevented from moving left or right; the bearing pressure ring includes the bearing inner pressure ring 8 and the bearing outer pressure ring 7, in order to eliminate the gap and ensure the accuracy, so in A bearing spacer ring 9 is installed between the two angular contact ball bearings; the inner pressure ring of the bearing and the outer pressure ring of the bearing are rings with internal threads and external threads; the upper surfaces of the inner pressure ring of the bearing and the outer pressure ring of the bearing are both There is a process slot for easy installation and operation.

The inner pressure ring of the bearing is sleeved on the threaded connection section of the pin shaft, and is fixedly connected with the pin shaft; the outer pressure ring of the bearing is fixedly connected with the pillar.

The inner pressure ring of the bearing and the outer pressure ring of the bearing play the role of fixing the rotating shaft and the rolling bearing, and the rolling bearing and the base. The rolling bearings are angular contact ball bearings and deep groove ball bearings.

Both the connecting plate and the connecting portion are provided with through holes, and the through holes on the connecting plate and the through holes on the connecting portion are threadedly connected by screws 11 .

A pendulum mirror trimming pad is provided between the connecting portion and the corresponding connecting plate. The pendulum mirror trimming pad 10 has the same structure as the common circular washer. During assembly and adjustment, the thickness and other dimensions of the pendulum mirror trimming pad 10 can be studied as required to meet the design requirements of high rotational accuracy of the pendulum mirror.

The rolling bearing of the left rotating shaft includes two angular contact ball bearings, and these two angular contact ball bearings are sleeved on the pin shaft back to back, and the rolling bearing of the right rotating shaft is a deep groove ball bearing.

There are three stress relief grooves on the connection plate and the connection portion, two of the three stress relief grooves on the connection plate and the connection portion are arranged horizontally and the other is vertically arranged.

The swing mirror seat comprises a picture frame 13 and a base plate 14, the picture frame and the base plate are fixedly connected to form a barrel, the swing mirror is embedded in the barrel, and the reflective surface of the swing mirror is higher than outside the barrel or flush with the barrel (ie the swing mirror 3 Except for the reflective surface, the rest of the surfaces are embedded in the barrel 2), and buffer glue is filled between the swing mirror and the swing mirror seat. Wherein, the buffer rubber may be silicone rubber.

The swing mirror groove is adapted to the shape of the swing mirror.

The bottom plate is provided with a plurality of through holes, one of which is located at the center of the bottom plate, and the rest of the through holes are evenly distributed along the circumference with the center of the bottom plate as the center, and buffer glue can be injected through the through holes on the bottom plate to make the swing mirror and The swing mirror base is fixedly connected; there are glue injection holes and glue flow grooves on the mirror frame, and buffer glue is injected through the glue injection holes to provide auxiliary support for the swing mirror 3.

During work, the swing mirror 3 and the swing mirror base 2 are fixedly connected, and the connecting parts at the opposite ends of the swing mirror base 3 are respectively fixedly connected with the left rotating shaft 4 and the right rotating shaft 5, and the rolling bearing 6 forms a rotating pair with the base 1, that is, the swing The mirror 3 can freely rotate around the coaxial axis of the through hole on the support.

Under the influence of environmental temperature and other loads, the swing mirror will undergo stress deformation. Since the normal size of the swing mirror is small, the deformation is small and negligible. Although the deformation in the other two directions is large, the swing mirror and the swing mirror seat There is no direct contact in the circumferential direction, and the buffer glue injected between the two forms a flexible support, that is, the stress and deformation of the swing mirror will not or a small amount be transmitted to the swing mirror seat. Therefore, the stress and deformation of the swing mirror itself will affect the rotation accuracy. Ignorable. The size of the oscillating mirror base along the normal direction of the oscillating mirror is small, and the amount of deformation is small, so it can be ignored. The deformation in the other two directions is relatively large, and the oscillating mirror base is connected to the rotating shaft through the threaded holes provided at the left and right ends. Therefore, the stress and deformation will be transmitted to the shaft system through this connection relationship, thus affecting the rotation accuracy. As mentioned above: there are stress relief grooves on the connecting part of the swing mirror base and the connecting plate of the pin shaft. When deformation occurs, the width of the stress relief groove will increase or decrease with the change of the environmental load, thereby To eliminate the effect of stress, it can greatly reduce the stress deformation of the shaft system, thereby ensuring the rotation accuracy and improving the working reliability and stability of the oscillating mirror.

Claims (6)

1. a kind of high accuracy pendulum mirror structure for reducing stress deformation, including base, pendulum mirror, pendulum microscope base and two rotating shafts, two turn Axle is coaxial, it is characterised in that：

The base is provided with two pillars, and through hole is equipped with the isometry position on two pillars；Pendulum mirror is fixed on pendulum microscope base On；Two rotating shafts are respectively left rotary shaft and right spindle, and left rotary shaft and right spindle are separately mounted in a through hole of pillar；Turn left Axle and right spindle include bearing pin and the rolling bearing being enclosed on bearing pin, and the relative one end of two bearing pins is provided with connecting plate,

The relative both ends of pendulum microscope base are provided with connecting portion, the connecting portion respectively with the connecting plate of left rotary shaft and the connecting plate of right spindle It is fixedly connected；

Stress relief groove is equipped with the connecting plate and connecting portion；

The other end of two bearing pins is equipped with threaded connection section；Bearing pin is provided with block and bearing pressure for spacing rolling bearing Circle, rolling bearing is between corresponding block and bearing trim ring；Bearing trim ring includes trim ring and the outer trim ring of bearing in bearing；

Bearing internal pressure snare is connected on the threaded connection section of bearing pin, is fixedly connected with bearing pin；The outer trim ring of bearing is fixedly connected with pillar；

Pendulum microscope base includes picture frame and bottom plate, and picture frame is connected with bottom plate forms a barrel, and pendulum mirror is embedded in the barrel, puts mirror Reflecting surface be higher by barrel or concordant with barrel, put and be filled with buffering adhesive between mirror and pendulum microscope base；

Offer multiple through holes on bottom plate, one of through hole is located at the center of bottom plate, remaining through hole using the center of bottom plate as The center of circle, it is uniformly distributed along the circumference；Hole for injecting glue and spew groove are provided with picture frame.

2. the high accuracy pendulum mirror structure according to claim 1 for reducing stress deformation, it is characterised in that：Two angular contact balls Bearing spacer is installed between bearing.

3. the high accuracy pendulum mirror structure according to claim 2 for reducing stress deformation, it is characterised in that：Connecting plate and connection It is equipped with through hole in portion, is connected between the through hole on through hole and connecting portion on connecting plate by screw thread.

4. the high accuracy pendulum mirror structure according to claim 3 for reducing stress deformation, it is characterised in that：Connecting portion with it is corresponding Connecting plate between be provided with pendulum mirror and repair and cut pad.

5. the high accuracy pendulum mirror structure according to claim 4 for reducing stress deformation, it is characterised in that：The rolling of left rotary shaft Bearing includes two angular contact ball bearings, and the two angular contact ball bearings are back-to-back to be socketed on bearing pin, the axis of rolling of right spindle It is deep groove ball bearing to hold.

6. high accuracy pendulum mirror structure according to any one of claims 1 to 5, it is characterised in that：

Stress relief groove on connecting plate with connecting portion has three, on connecting plate and in three stress relief grooves of connecting portion Two transverse directions are set, another is vertically arranged.