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CN-121992353-A - Positioning and mounting system for coating large-size optical element

CN121992353ACN 121992353 ACN121992353 ACN 121992353ACN-121992353-A

Abstract

The invention discloses a positioning and mounting system for coating a large-size optical element, which comprises a main body structure, a lifting mechanism, a rotary bearing platform, a movement mechanism and a safety protection mechanism. The main body structure adopts a rigid design of composite support of a tripod and a tailstock. The lifting mechanism drives the double ball screws to synchronously move through the worm gear reducer, so that the precise lifting of the bearing platform is realized. The rotary bearing platform can freely rotate by 360 degrees and is provided with a counterweight groove for adjusting the gravity center. The motion mechanism realizes flexible movement and stable support of the system. The safety protection mechanism integrates inclination, overload and limit detection. The invention solves the problems of difficult mounting and positioning and poor operation safety of large-size high-surface-shape precision optical elements in the film plating process, and realizes the safe, convenient and high-precision auxiliary mounting and positioning of the tool outside the film plating machine.

Inventors

  • WANG SHUGUANG
  • LIU CONGYUAN
  • LI YAOPENG
  • DUAN WEIBO
  • ZHOU CHENG
  • HU JINCHAO
  • XIE PING
  • MA XIAOFENG
  • CAI QINGYUAN
  • WANG RUOWEI

Assignees

  • 中国科学院上海技术物理研究所

Dates

Publication Date
20260508
Application Date
20260323

Claims (8)

  1. 1. The positioning and mounting system for coating the large-size optical element is characterized by comprising a main body structure (1), a lifting mechanism (2), a rotary bearing platform (3) and a movement mechanism (4); The main body structure (1) comprises a bottom plate (101) and an upright post (102) vertically fixed in the center of the bottom plate (101); The lifting mechanism (2) comprises a driving assembly and a guiding assembly, wherein the driving assembly comprises a driving part and a ball screw (207), the ball screw (207) is arranged between the top end of the upright post (102) and the bottom plate (101), the driving part drives the ball screw (207) to rotate, the ball screw (207) is provided with a screw nut (211) capable of moving up and down linearly along with the rotation of the ball screw, and the guiding assembly comprises sliding rails (209) arranged on two sides of the ball screw (207) in parallel, and a lifting sliding block (210) arranged on the sliding rails (209); The rotary bearing platform (3) is sleeved on the outer side of the upright post (102), is connected with a screw nut (211) of the lifting mechanism (2) and a sliding block (210) of the guide assembly, and is driven by the driving assembly and lifted on the main body structure (1) with the aid of the guide assembly, wherein the rotary bearing platform (3) comprises a hollow sliding hole which is arranged in the middle and sleeved on the outer side of the upright post (102), a front bearing platform and a rear counterweight groove (302) which are arranged at two ends of the sliding hole, and is provided with a fork plate (301) and a cross platform (303) which is rotationally connected with the fork plate (301); The motion mechanism (4) is arranged at the bottom of the bottom plate (101).
  2. 2. The positioning and mounting system as claimed in claim 1, wherein the main body structure (1) is further provided with a front support frame (103) and a support tail frame (104) which keep the upright post (102) vertical to the bottom plate (101), the front support frame (103) is a tripod, and the front support frame (103) and the support tail frame (104) are respectively arranged at two ends of the upright post (102) and clamp the fixed upright post (102); the driving assembly is provided with two ball screws (207), the guiding assembly is provided with two pairs of sliding rails (209), each ball screw (207) is provided with a pair of sliding rails (209) in a matching way, each ball screw (207) is provided with a screw nut (211), and each sliding rail (209) is provided with two sliding blocks (210); Two sides of each ball screw (207) are respectively provided with a sliding rail (209) in parallel, and the two ball screws (207) and the two pairs of sliding rails (209) are symmetrically arranged at the outer sides of the upright post (102); The sliding hole of the rotary bearing platform (3) is square, two opposite sides in the sliding hole are respectively connected with a corresponding ball screw (207) and a sliding rail (209), and each side is connected with a corresponding screw nut (211) and four sliding blocks (210).
  3. 3. The positioning and mounting system of claim 2, wherein a motor platform (205) is arranged at the top of the main body structure (1), a driving part of the driving assembly is arranged on the motor platform (205), two ball screws (207) are connected with the driving part through couplings (206), the driving part comprises a variable frequency driving motor (201), a high-gear-ratio worm gear reducer (202) and two low-gear-ratio worm gear reducers (203), the couplings (206) are connected with the low-gear-ratio worm gear reducers (203), the variable frequency driving motor (201) and the high-gear-ratio worm gear reducers (202) are axially and horizontally arranged on the motor platform (205), the two low-gear-ratio worm gear reducers (203) are axially and vertically arranged on two sides of the high-gear-ratio worm gear reducers (202), and the two ball screws (207) are respectively connected with output ends of the two low-gear-ratio worm gear reducers (203) through the couplings (206).
  4. 4. The positioning and racking system of claim 2, wherein the lifting mechanism (2) controls the lifting and lowering rate of the rotary carrying platform (3) to be less than or equal to 0.5mm/s.
  5. 5. The positioning and racking system of claim 1, wherein the cross platform (303) is rotatably connected to the fork plate (301) by a flange bushing (304) and a platform shaft (305), the cross platform (303) being capable of 360 degrees of free rotation.
  6. 6. The positioning and racking system according to claim 1, wherein the movement mechanism (4) comprises steering wheels and supporting wheels, the steering wheels are driving steering wheels (401), the supporting wheels comprise rear supporting wheels (403) and front supporting wheels (404), the rear supporting wheels (403) are provided with at least one pair, and the front supporting wheels (404) are provided with at least one pair; the driving steering wheel (401) is arranged at the central bottom of the supporting tail frame (104) through a driving connecting piece (402), the rear supporting wheels (403) are symmetrically arranged at the bottoms of the two sides of the supporting tail frame (104), and the front supporting wheels (404) are arranged at the front end of the bottom plate (101).
  7. 7. The positioning and racking system of claim 6, wherein the front support wheels (404) are arranged in three pairs symmetrically mounted in parallel to the front end of the bottom of the base plate (101).
  8. 8. The positioning and racking system according to claim 1, wherein the positioning and racking system is further provided with a safety protection mechanism (5), the safety protection mechanism (5) comprises an inclination angle detector (501), an axial pressure sensor (502), an upper limiter (503), a lower limiter (504) and an emergency stop button (505) for manual stop in emergency, the inclination angle detector (501) and the upper limiter (503) are arranged at the top of the upright post (102), the axial pressure sensor (502) is arranged in the middle of the platform rotating shaft (305), and the lower limiter (504) is arranged at the top of the support tailstock (104); When the system dip angle exceeds 3 degrees, the dip angle detector (501) triggers stopping, the upper limiter (503) and the lower limiter (504) trigger limiting signals and stop when the rotary bearing platform (3) runs to the limit position, and when the load exceeds the set value of the cross platform (303), the axial pressure sensor (502) triggers stopping lifting and rotation and gives an alarm.

Description

Positioning and mounting system for coating large-size optical element Technical Field The invention relates to the field of vacuum optical coating, in particular to a positioning and mounting system for coating a large-size optical element. Background The large-caliber infrared optical element coating technology is one of key technologies of high-resolution space cameras, and the maximum size of an optical element applied to the high-resolution space camera at present is over 2000mm caliber, and the weight is over 500kg. In the coating process, the optical element is required to be hoisted at the top of the vacuum chamber, and because of the large self gravity, the requirement on the coating hoisting technology is very high, and coating auxiliary installation equipment is required to be specially designed for coating the large-caliber infrared optical element so as to ensure that the surface shape precision of the optical element in the coating hoisting process meets the requirement. At present, manufacturers of large-size coating machines at home and abroad do not have matched coating auxiliary installation systems, customers mostly reform simple coating auxiliary installation equipment by using a forklift according to own needs, and the equipment has high starting speed, abrupt pause and high lifting speed in the lifting process and cannot guarantee the high-precision requirement of the surface shape of the optical element. The fork arm platform is seriously inclined under the condition of large load, and the product and the workpiece frame of the coating machine are difficult to install. In addition, the existing equipment is mostly in a hydraulic lifting type, so that the mirror body product is extremely easy to fall down after faults occur, and the use risk is high. Therefore, there is a need to design a coating auxiliary installation system for large-caliber infrared optical elements, which can meet the high-precision requirement of the mirror surface shape, has high alignment precision during product installation and can ensure the safety of the product in the use process. Disclosure of Invention The invention aims to provide a positioning and mounting system for coating a large-size optical element, which solves the problems that the existing coating auxiliary mounting system is high in starting speed, sudden in stopping and high in lifting speed in the lifting process, and cannot guarantee the high-precision requirement of the surface shape of the optical element, solves the problems that a fork arm platform is serious in inclination and a product and a workpiece frame of a coating machine are difficult to mount in the heavy load process in the prior art, and solves the problems that most of existing equipment is hydraulic lifting type, a mirror product is easy to fall down after faults occur, and the use risk is high. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the positioning and mounting system for coating the large-size optical element comprises a main body structure, a lifting mechanism, a rotary bearing platform and a movement mechanism; the main body structure comprises a bottom plate and an upright post vertically fixed in the center of the bottom plate; the lifting mechanism comprises a driving component and a guide component, wherein the driving component comprises a driving part and a ball screw, the ball screw is arranged between the top end of the upright post and the bottom plate, the driving part drives the ball screw to rotate, and the ball screw is provided with a screw nut capable of moving up and down along with the rotation of the ball screw; The rotary bearing platform is sleeved on the outer side of the upright post and is connected with a screw nut of the lifting mechanism and a sliding block of the guide assembly, and the rotary bearing platform is driven by the driving assembly and is lifted on the main body structure with the aid of the guide assembly; The motion mechanism is arranged at the bottom of the bottom plate. The main body structure is also provided with a front supporting frame and a supporting tail frame, wherein the front supporting frame is used for keeping the upright post and the bottom plate vertical, and the front supporting frame is a tripod; The driving assembly is provided with two ball screws, the guiding assembly is provided with two pairs of sliding rails, and each ball screw is provided with a pair of sliding rails in a matched manner; two sides of each ball screw are provided with a sliding rail respectively, and the two ball screws and the two pairs of sliding rails are symmetrically arranged at the outer sides of the upright post; The sliding hole of the rotary bearing platform is square, two opposite sides in the sliding hole are respectively connected with the corresponding ball screw and the sliding rail, and each side is connected with a corresponding screw nut and four sliding blocks.