CN112677041A

CN112677041A - Flat rotating mechanism

Info

Publication number: CN112677041A
Application number: CN202011603034.1A
Authority: CN
Inventors: 罗霄; 张学军; 薛栋林
Original assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Current assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-04-20

Abstract

The invention provides a flat turning mechanism, comprising: the device comprises an eccentric rotating shaft, a flat rotating shaft and a flat rotating maintaining unit for limiting the flat rotating shaft to rotate; the output end of the eccentric rotating shaft is rotatably sleeved with the flat rotating shaft; the horizontal rotation maintaining unit comprises a rocker and 2 connecting rods, wherein one end of the rocker is hinged and fixed, and the other end of the rocker is connected with the 2 connecting rods; the horizontal rotating shaft comprises a first cross beam, the rocker comprises a second cross beam, and two ends of the first cross beam and two ends of the second cross beam are respectively connected with 2 connecting rods through spherical bearings and form a parallelogram structure in an enclosing mode. The invention limits the rotation of the flat rotating shaft through the flat rotating holding unit, and the flat rotating shaft does not generate autorotation and generates standard flat rotation in the rotating process of the eccentric rotating shaft.

Description

Flat rotating mechanism

Technical Field

The invention relates to the field of aspheric surface forming, in particular to a flat rotating mechanism.

Background

The small grinding head technology is the earliest developed and the most widely applied one in the computer aspheric surface forming technology, has simple structure and wide application range, and can be widely applied to the processing of round or non-round aspheric reflectors with medium and small calibers. The small grinding head technology adopts a computer to control a grinding head (1/25-1/40) which is much smaller than the size of a mirror surface to grind or polish an optical part, and the removal amount of materials is controlled by controlling the residence time of the grinding head at different positions of the surface of a workpiece, namely the processing time and the relative pressure between the grinding head and the workpiece. In the processing process, under the influence of factors such as abrasion of the grinding head, flow deformation of the asphalt layer and the like, the small grinding head can relatively well track the change of the curvature radius of each point of the aspheric surface, so that the small grinding head can be well matched with the surface shape of the aspheric surface, and high processing precision can be obtained. The small grinding head technology is basically a simulation of manual grinding process of people, compared with manual grinding, the small grinding head technology adopts computer control, the control is more accurate than manual grinding, quantitative detection results are adopted to guide processing, the material removing process is more accurate, and therefore the processing repetition accuracy and the surface shape convergence efficiency of the small grinding head technology are greatly improved compared with manual grinding.

The small grinding head technology mostly adopts a planetary rotation mode in the initial development stage, the grinding head still performs revolution motion around a main shaft while rotating around a planetary shaft, and removal functions with different distributions can be obtained by controlling the speed ratio of rotation and revolution. If the rotation speed and the revolution speed of the polishing disk are equal and the directions are opposite, the polishing disk becomes a more special planetary motion mode, namely flat rotation, the flat rotation can form a smooth removal function curve with the maximum removal amount, and according to optical processing experience, the distributed removal function can obtain better surface shape convergence efficiency.

At present, a flat rotation mode is obtained, mainly a rotation limiting structure is installed on a flat rotation shaft, for example, in patent No. CN102744663B, "flat rotation polishing fairing device", a guide rail structure is used for rotation limitation, and a motion generated by using this mode is not a real flat rotation due to a constraint mode of the limiting structure, and can generate a swing around a fixed point, so that a motion error is generated, and further, a removal function is caused to generate an asymmetric change, and the processing efficiency is influenced.

Disclosure of Invention

The invention provides a flat rotation mechanism for solving the problem of motion error caused by the existing flat rotation.

In order to achieve the purpose, the invention adopts the following specific technical scheme:

a pan mechanism comprising: the device comprises an eccentric rotating shaft, a flat rotating shaft and a flat rotating maintaining unit for limiting the flat rotating shaft to rotate; the output end of the eccentric rotating shaft is rotatably sleeved with the flat rotating shaft; the horizontal rotation maintaining unit comprises a rocker and 2 connecting rods, wherein one end of the rocker is hinged and fixed, and the other end of the rocker is connected with the 2 connecting rods; the horizontal rotating shaft comprises a first cross beam, the rocker comprises a second cross beam, and two ends of the first cross beam and two ends of the second cross beam are respectively connected with 2 connecting rods through spherical bearings and form a parallelogram structure in an enclosing mode.

Preferably, the rocker further comprises a third cross beam parallel to the second cross beam and a connecting rod for connecting the second cross beam and the third cross beam; two ends of the connecting rod are respectively and fixedly connected with the second cross beam and the third cross beam.

Preferably, two ends of the third cross beam are respectively connected and fixed with the machine body through spherical bearings.

Preferably, the lower end of the flat rotating shaft is connected with the grinding disc.

Preferably, a rotating bearing is arranged on the flat rotating shaft, and the output end of the eccentric rotating shaft is sleeved on the rotating bearing.

The invention can obtain the following technical effects:

the flat rotation holding unit is connected with the flat rotating shaft, and the flat rotating shaft does not rotate and generates standard flat rotation in the rotating process of the eccentric rotating shaft.

Drawings

Fig. 1 is a schematic diagram of a simplified structure according to an embodiment of the present invention.

Wherein the reference numerals include: eccentric rotating shaft 1, flat rotating shaft 2, first beam 21, connecting rod 31, rocker 32, second beam 321, connecting rod 322, third beam 323 and grinding disc 4.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1, the flat rotation mechanism provided in the embodiment of the present invention includes: the device comprises an eccentric rotating shaft 1, a flat rotating shaft 2 and a flat rotating holding unit for limiting the flat rotating shaft 2 to rotate; the output end of the eccentric rotating shaft 1 is rotatably sleeved with the flat rotating shaft 2, the eccentric rotating shaft 1 comprises a motor rotating shaft and an output end, and the axes of the motor rotating shaft and the output end are parallel and do not coincide to drive the output end to do rotary motion along the motor rotating shaft. The horizontal rotation holding unit is connected with the horizontal rotation shaft 2 to limit the horizontal rotation shaft 2 to rotate, and the horizontal rotation shaft 2 revolves along the rotation shaft of the motor under the driving of the eccentric rotation shaft 1 to form standard horizontal rotation.

The horizontal rotation maintaining unit comprises a

rocker

32 and 2 connecting rods 31, one end of the rocker 32 is hinged and fixed, and the other end of the rocker 32 is connected with the 2 connecting rods 31; the horizontal rotating shaft 2 comprises a first cross beam 21, the rocker 32 comprises a second cross beam 321, and two ends of the first cross beam 21 and two ends of the second cross beam 321 are respectively connected with the 2 connecting rods 31 through spherical bearings and form a parallelogram structure in an enclosing mode. The two ends of the rocker 32 are both kinematic joints, the two ends of the connecting rod 31 are both kinematic joints, the distance between two spherical bearings on the first cross beam 21 is equal to the distance between two spherical bearings on the second cross beam 321, and the lengths of the 2 connecting rods 31 are also equal, so that in the process that the leveling rotating shaft 2 moves under the driving of the eccentric rotating shaft 1, the first cross beam 21, the second cross beam 321 and the 2 connecting rods 31 always enclose a parallelogram, and the leveling rotating shaft 2 is further limited to rotate.

In an embodiment of the present invention, the rocker 32 further includes a third beam 323 parallel to the second beam 321, a connecting rod 322 connecting the second beam 321 and the third beam 323; two ends of the connecting rod 322 are respectively fixedly connected with the second beam 321 and the third beam 323; the second beam 321 can be limited in movement range by the third beam 323 and the connecting rod 322, and a parallelogram structure is guaranteed.

In an embodiment of the invention, the device further comprises a rigid machine body, wherein two ends of the third cross beam 323 are respectively connected and fixed with the rigid machine body through spherical bearings; the rigid body is connected through the spherical bearing, so that the connection can be reinforced, the movement smoothness of the rocker 32 can be improved, and the function of limiting the movement of the rotating shaft 2 by the rocker 32 can be better exerted.

In one embodiment of the invention, the lower end of the flat rotating shaft 2 is connected with the grinding disc 4, and the grinding disc 4 is driven to carry out standard flat rotating polishing work.

In one embodiment of the invention, the output end of the eccentric rotating shaft 1 is rotatably sleeved with the flat rotating shaft 2 through a rotating bearing. The flat rotating shaft 2 is provided with a rotating bearing, the output end of the eccentric rotating shaft 1 is inserted into the rotating bearing, the output end of the eccentric rotating shaft 1 is sleeved, and the flat rotating shaft 2 revolves along the rotating shaft of the motor under the driving of the eccentric rotating shaft 1.

The invention can realize real horizontal rotation, generates a rotationally symmetrical removal function, and has important significance for improving the optical processing efficiency.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be taken as limiting the invention. Variations, modifications, substitutions and alterations of the above-described embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

The above embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pan mechanism, comprising: the device comprises an eccentric rotating shaft, a flat rotating shaft and a flat rotating maintaining unit for limiting the flat rotating shaft to rotate; the output end of the eccentric rotating shaft is rotatably sleeved with the flat rotating shaft; the horizontal rotation maintaining unit comprises a rocker and 2 connecting rods, wherein one end of the rocker is hinged and fixed, and the other end of the rocker is connected with the 2 connecting rods; the horizontal rotating shaft comprises a first cross beam, the rocker comprises a second cross beam, and the two ends of the first cross beam and the two ends of the second cross beam are respectively connected with 2 connecting rods through spherical bearings and form a parallelogram structure in an enclosed mode.

2. The pan mechanism of claim 1, wherein the rocker further comprises a third beam parallel to the second beam, a connecting rod connecting the second beam and the third beam; and two ends of the connecting rod are respectively and fixedly connected with the second cross beam and the third cross beam.

3. The pan mechanism of claim 2, further comprising a rigid body, wherein two ends of the third beam are respectively connected and fixed with the rigid body through spherical bearings.

4. The pan mechanism of claim 1, wherein the lower end of the pan shaft is connected to a grinding disc.

5. The flat rotating mechanism according to claim 1, wherein a rotating bearing is provided on the flat rotating shaft, and an output end of the eccentric rotating shaft is sleeved on the rotating bearing.