CN112483820B - Shafting locking mechanism for optical measurement equipment - Google Patents

Shafting locking mechanism for optical measurement equipment Download PDF

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Publication number
CN112483820B
CN112483820B CN202011180267.5A CN202011180267A CN112483820B CN 112483820 B CN112483820 B CN 112483820B CN 202011180267 A CN202011180267 A CN 202011180267A CN 112483820 B CN112483820 B CN 112483820B
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Prior art keywords
plate
locking
locking mechanism
shafting
fixed seat
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CN112483820A (en
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李翔宇
邱鹏
张占鹏
刘德宏
叶子孟
宋巍
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XiAn Institute of Optics and Precision Mechanics of CAS
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XiAn Institute of Optics and Precision Mechanics of CAS
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02Heads
    • F16M11/04Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/06Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
    • F16M11/08Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a vertical axis, e.g. panoramic heads
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00Pivots; Pivotal connections
    • F16C11/04Pivotal connections
    • F16C11/10Arrangements for locking
    • F16C11/103Arrangements for locking frictionally clamped
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02Heads
    • F16M11/16Details concerning attachment of head-supporting legs, with or without actuation of locking members thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M2200/00Details of stands or supports
    • F16M2200/02Locking means
    • F16M2200/021Locking means for rotational movement
    • F16M2200/022Locking means for rotational movement by friction

Abstract

The invention provides a shafting locking mechanism for optical measurement equipment, which solves the problem of poor staring function caused by the influence of natural wind load when the optical measurement equipment is used for measuring a target landing point. The shafting locking mechanism comprises a fixed seat, a supporting bearing, a load platform and a plurality of groups of locking units; the fixed seat is of a sleeve structure; the load platform comprises a rotating shaft and a load mounting plate; the load mounting plate is fixedly arranged on the outer side of the rotating shaft and used for carrying optical measuring equipment; the rotating shaft is arranged in the cavity of the fixed seat through a supporting bearing and can rotate along the axis of the fixed seat; the multiple groups of locking units are arranged on the outer side of the fixing seat and used for locking the load platform. The pressing force generated by the locking unit is distributed along the axial direction of the equipment, and the adverse effect on the performance and the precision of an equipment shaft system is avoided.

Description

Shafting locking mechanism for optical measurement equipment
Technical Field
The invention belongs to the field of optical measurement, and particularly relates to a shafting locking mechanism for optical measurement equipment.
Background
In optical measurement, the measurement of a target's landing point often requires the device to have a gaze function, i.e., the device can be fixed at a fixed angle for measurement. However, when the optical measuring device works, the optical measuring device is often in an open place, and the measurement of the optical measuring device is affected by the natural environment, particularly the wind load.
When the uncontrollable natural wind load acts on the optical measuring equipment, a servo system of the optical measuring equipment is difficult to ensure that the equipment can be fixed at a certain fixed angle for measurement through parameter adjustment. As a result, the device may shake due to wind load, which results in poor measurement effect, and may even cause the loss of the measurement target, which seriously affects the experiment progress. Therefore, the optical measurement equipment is often provided with a mechanical locking mechanism on a shaft system, and the staring work of the equipment is ensured.
The commonly used mechanical locking mechanism is generally provided with an electromagnetic brake on a shaft system, and the locking of the shaft system of the equipment is ensured by electrifying and powering off the electromagnetic brake, so that the staring function of the equipment is ensured. For example, a plurality of schemes including chinese patents "CN 209416327U" and "CN 210118600U" all adopt such forms, and such mechanisms have the advantages of compact structure, simple form, fast locking speed, reliable locking, and the like. However, when a plurality of sets of parts are mounted on a complicated shafting or a shafting, it is difficult to install and maintain the electromagnetic brake. Meanwhile, the installation of the mechanical locking mechanism of the type must be coaxial with a shaft system due to the structural form of the electromagnetic brake, and the installation position is limited to a certain extent.
Disclosure of Invention
The invention aims to solve the problem of poor staring function caused by the influence of natural wind load when optical measuring equipment is used for measuring a target landing point, and provides a shafting locking mechanism for the optical measuring equipment.
In order to realize the purpose, the technical scheme of the invention is as follows:
a shafting locking mechanism for optical measurement equipment comprises a fixed seat, a support bearing, a load platform and a plurality of groups of locking units; the fixed seat is of a sleeve structure; the load platform comprises a rotating shaft and a load mounting plate; the load mounting plate is fixedly arranged on the rotating shaft and used for carrying optical measurement equipment; the rotating shaft is arranged in the cavity of the fixed seat through the supporting bearing and can rotate along the axis of the fixed seat; the locking units are arranged on the outer side of the fixed seat and used for locking the load platform, and each locking unit comprises a locking support plate, a right support plate, a left support plate, a pressing module, a central shaft, a rotary bearing, an electromagnet, a friction plate and a limiting block; the locking support plate is arranged on the outer side of the fixed seat; the right supporting plate and the left supporting plate are arranged on the locking supporting plate, and the end surfaces of the right supporting plate and the left supporting plate are provided with mounting holes; the compressing module comprises a locking plate, a rotating seat and a suction plate which are connected in sequence; the rotary seat is provided with a bearing mounting hole, and the weight of the locking plate is greater than that of the suction plate; the central shaft is arranged in a bearing mounting hole of the pressing module through a rotating bearing, and two ends of the central shaft respectively penetrate through mounting holes of the right supporting plate and the left supporting plate and are fixedly connected with the right supporting plate and the left supporting plate; the electromagnet is arranged on the locking support plate, is positioned below the suction plate and is used for generating electromagnetic force for downward movement of the suction plate when the electromagnet is electrified; the friction plate is arranged on the locking plate, and the upper end surface of the friction plate generates friction torque with the lower end surface of the load mounting plate when the electromagnet is electrified so as to lock the load platform; the limiting block is arranged on the locking support plate and located below the friction plate and used for limiting the downward movement distance of the friction plate.
Furthermore, the rotating bearing comprises two angular contact ball bearings which are arranged back to back, one end of an inner ring of each angular contact ball bearing is limited through a step arranged on the central shaft, and the other end of the inner ring of each angular contact ball bearing is pre-tightened through a bearing pressing ring and a locking nut.
Further, a locking mechanism protection cover is arranged on the outer side of the fixing seat, and the locking unit is arranged in the locking mechanism protection cover.
Furthermore, the outer sides of the left support plate and the right support plate are provided with a locking pressing plate and a fixing screw, and the fixing screw penetrates through the locking pressing plate to connect the left support plate and the right support plate with the central shaft.
Furthermore, the end face of the suction plate is provided with a through suction hole.
Further, the friction plate is a polyurethane rubber material plate.
Furthermore, the locking units are divided into three groups, four groups or six groups, and are uniformly distributed outside the fixed seat by taking the axis of the fixed seat as the circle center.
Further, the clearance between the locking plate and the limiting block
Figure BDA0002749978410000031
Wherein L is2Is the distance between the center of the friction plate and the axis of the central shaft, L1The distance between the center of the electromagnet and the axis of the central shaft is X, and the attraction distance of the electromagnet is X.
Furthermore, the rotating shaft is a hollow shaft, so that the weight of the whole shafting locking mechanism is reduced.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
1. the invention provides a universal optical measuring equipment shafting locking mechanism, which is used for solving the problem of poor staring function caused by the influence of natural wind load when the optical measuring equipment is used for measuring a target landing point.
2. The shaft system locking mechanism is arranged on the outer side of the measuring equipment, is convenient to disassemble and maintain, has high sensitivity, low processing cost and strong universality, and overcomes the defects that an electromagnetic brake is difficult to install and maintain in certain shaft systems and the installation position is limited.
3. The shafting locking mechanism can be uniformly distributed at three points, four points or six points according to the requirements of installation space and locking torque.
Drawings
FIG. 1 is a schematic structural diagram of a shafting locking mechanism for an optical measurement device according to the present invention;
FIG. 2 is a schematic structural view of a locking unit of the present invention;
FIG. 3 is a cross-sectional view of a shafting locking mechanism for an optical measuring device according to the present invention;
FIG. 4 is a cross-sectional view C-C of FIG. 3;
FIG. 5 is a schematic view of the center of gravity of the compression module and a simplified lever model according to the present invention;
FIG. 6 is a schematic view of three-point uniform installation of the locking unit and the stress of the load platform.
Reference numerals: 1-a friction plate; 2-locking the nut; 3-locking mechanism protecting cover; 4, locking a pressure plate; 5-a right support plate; 6-left support plate; 7-central axis; 8, locking a support plate; 9-a limiting block; 10-a compression module; 11-bearing clamping ring; 12-a rotational bearing; 13-a suction hole; 14-bearing mounting holes; 15-an electromagnet; 16-a fixed seat; 17-a support bearing; 18-load platform, 19-rotating shaft, 20-load mounting plate, 21-locking plate, 22-rotating seat and 23-suction plate.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.
The invention provides a shafting locking mechanism for optical measurement equipment, wherein pressing force generated by the shafting locking mechanism is distributed along the axial direction of the equipment, and adverse effects on the performance and the precision of the shafting of the equipment are avoided. Meanwhile, the shafting locking mechanism reasonably utilizes the structural space, is convenient to install, disassemble and maintain, has high sensitivity, low processing cost and strong universality, and overcomes the defects that the electromagnetic brake is difficult to install and maintain in certain shafting and the installation position is limited.
As shown in fig. 1 to 4, the shafting locking mechanism for an optical measurement device provided by the present invention includes a fixing base 16, a supporting bearing 17, a load platform 18 and a plurality of sets of locking units. The fixed seat 16 of the invention is a sleeve structure which is still and is a supporting part of the whole locking mechanism and provides support for other devices. The load platform 18 comprises a rotating shaft 19 and a load mounting plate 20; the load mounting plate 20 is fixedly provided on the rotary shaft 19 and used for mounting an optical measuring device. For example, a camera unit having a lens is mounted to monitor a dynamic or static target. The rotating shaft 19 is arranged in the cavity of the fixed seat 16 through the supporting bearing 17 and can rotate along the axis of the fixed seat 16, at the moment, the outer ring of the supporting bearing 17 is installed on the fixed seat 16 through screws, and the inner ring is connected with the rotating shaft 19 through screws. The rotating shaft 19 may be provided as a hollow shaft for reducing the weight of the entire structure.
The multi-group locking units are integrally installed on the outer side of the fixing seat 16 and used for locking the load platform 18, the locking mechanism protection cover 3 is installed on the outer side of the fixing seat 16 through screws, the multi-group locking units are uniformly distributed by taking the axis of the fixing seat 16 as the circle center according to the installation space and the locking torque requirements of the fixing seat 16, and the mounting mode of uniformly distributing multiple points such as three points, four points or six points can be carried out.
As shown in fig. 2 to 4, each set of locking units includes a locking support plate 8, a right support plate 5, a left support plate 6, a pressing module 10, a central shaft 7, a rotary bearing 12, an electromagnet 15, a friction plate 1 and a limiting block 9; the locking support plate 8 is arranged outside the fixed seat 16, and other parts of the locking unit are arranged on the fixed seat 16 through the locking support plate 8; right branch fagging 5, left branch fagging 6 set up in locking backup pad 8, and its terminal surface all is provided with the mounting hole, at this moment, can provide the support with right branch fagging 5, the parallel arrangement of left branch fagging 6 for the installation of center pin 7. The pressing module 10 comprises a locking plate 21, a rotating seat 22 and an attraction plate 23 which are connected in sequence, a bearing mounting hole 14 is formed in the rotating seat 22, and the weight of the locking plate 21 is larger than that of the attraction plate 23; the central shaft 7 is arranged in a bearing mounting hole 14 of the pressing module 10 through a rotary bearing 12, and two ends of the central shaft respectively penetrate through mounting holes of the right support plate 5 and the left support plate 6 and are fixedly connected with the right support plate 5 and the left support plate 6; the electromagnet 15 is arranged on the locking support plate 8 and is positioned below the absorbing plate 23 and used for generating electromagnetic force for downward movement of the absorbing plate 23 when the electromagnet is electrified; the friction plate 1 is arranged on the locking plate 21, and the upper end surface of the friction plate generates friction torque with the lower end surface of the load mounting plate 20 when the electromagnet 15 is electrified, so that the load platform 18 is locked; the limiting block 9 is arranged on the locking support plate 8 and below the friction plate 1, and is used for limiting the downward movement distance of the friction plate 1.
The rotary bearing 12 comprises two angular contact ball bearings which are arranged back to back, one end of an inner ring of each angular contact ball bearing is limited by a step arranged on the central shaft 7, and the other end of the inner ring of each angular contact ball bearing is pre-tightened by a bearing pressing ring 11 and a locking nut 2. The outer sides of the left support plate 6 and the right support plate 5 are provided with a locking pressing plate 4 and a fixing screw, and the fixing screw penetrates through the locking pressing plate 4 to connect the left support plate 6 and the right support plate 5 with a central shaft 7. The end surface of the suction plate 23 of the invention is provided with a through suction hole 13, and the suction hole 13 is not only used for reducing the weight of the suction plate 23, but also used for reducing the resistance generated when the suction plate 23 is sucked with the electromagnet 15.
The friction plate 1 of the shafting locking mechanism is made of polyurethane rubber material, the material has high wear resistance, high strength and good anti-aging performance, and meanwhile, the material has certain elasticity, so that when the electromagnet 15 is electrified to attract and press the module 10, the friction plate 1 generates certain micro elastic deformation in the process of generating pressing force between the friction plate 1 and the load platform 18, and the surface contact of the friction plate 1 and the plane of the load platform 18 and the effectiveness of converting the pressing force into friction torque are ensured.
The locking mechanism protection cover 3 is made of stainless steel materials which have good antirust performance, the shafting locking mechanism is protected well, the appearance is stable and attractive, and other parts are made of universal alloy steel materials.
According to the invention, the limiting block 9 is arranged below the friction plate 1, and the limiting block 9 is used for strictly limiting the falling distance of the pressing module 10 so as to prevent the electromagnet 15 from being separated from the other side of the suction plate 23 by too large distance, and the electromagnet 15 cannot provide enough suction force to suck the suction plate 23 when the power is on again.
When the shafting locking mechanism is installed, firstly, a pair of angular contact ball bearings are installed in the bearing installation hole 14 of the compression module 10 in a back-to-back mode, the central shaft 7 penetrates into inner holes of the pair of angular contact ball bearings from the right side to the left side, the bearings are pre-tightened by the bearing pressing ring 11 and the locking nut 2, and meanwhile, the flexibility of the compression module 10 around the angular contact ball bearings is guaranteed. The left end and the right end of the central shaft 7 are respectively arranged on the left support plate 6 and the right support plate 5, the locking pressing plate 4 is arranged on the outer sides of the left support plate 6 and the right support plate 5, the left support plate 6, the right support plate 5 and the central shaft 7 are tightened by using fixing screws, and the central shaft 7 is ensured not to rotate around an angular contact ball bearing under the condition of no external force by using friction force. Finally, the left support plate 6 and the right support plate 5 are connected through screws, the right support plate 5 is installed on the support plate through screws, the limiting block 9 is installed on the left side of the support plate, the gap delta between the limiting block 9 and the pressing module 10 is adjusted according to requirements, the electromagnet 15 is installed on the right side of the support plate, and the friction plate 1 is installed at the top end of the pressing module 10.
When the supporting shaft system needs to be locked, the electromagnet 15 is powered on, one side of the compressing module 10, close to the electromagnet 15, moves downwards and is sucked by the electromagnet 15, according to the lever principle, the compressing module 10 rotates around the axis (rotating fulcrum) of the central shaft 7, the locking plate 21 is lifted, the compressing force is generated between the friction plate 1 and the load platform 18, the compressing force is converted into the friction torque of the load platform 18 by using the friction principle, and then the load platform 18 is locked to resist the action of natural wind load. The pressing force generated by the structural form is distributed along the axial direction of the supporting bearing 17, and the performance and the precision of the supporting shaft system are not influenced.
When the locking of the supporting shaft system is not needed, the electromagnet 15 is powered off and demagnetized, and the pressing force generated between the friction plate 1 and the load platform 18 disappears. Meanwhile, the pressing module 10 is designed at the side of the friction plate 1 deviating from the axis of the central shaft 7 due to the gravity center of the pressing module, so that the side falls along the axis and is lapped on the limiting block 9, and the other side of the pressing module 10 is lifted up due to the lever principle and is separated from the electromagnet 15.
As shown in fig. 5 and 6, below, taking three-point uniformly distributed shafting locking mechanisms as an example, the friction torque provided by the shafting locking mechanism is calculated, and the gap between the limiting block 9 and the pressing module 10 is determined. The theoretical attraction force that can be provided when the electromagnet 15 is completely attracted,
F0=300N
considering the influence of factors such as assembly error, temperature, use time and the like on the electromagnet 15, and estimating the efficiency of the suction force provided by the electromagnet 15;
η1=0.7
the actual attraction force provided by the electromagnet 15,
F1=F0·η1=210N
according to the lever principle, the pressing force at the friction plate 1,
Figure BDA0002749978410000071
taking into account the coefficient of friction between the friction plate 1 and the load platform 18,
μ1=0.2
the center of the friction plate 1 is distant from the center of the support bearing 17,
R=0.25m
the 3-point uniform locking unit can provide friction torque,
M=3F2·μ1·R=29.5N·m
the friction torque provided is sufficient to overcome the natural wind load torque and ensure that the device remains at a fixed angle of gaze.
According to the relationship between the attraction distance of the electromagnet 15 and the attraction force, when the attraction distance X of the electromagnet 15 is 2mm, the theoretical attraction force provided is 8N, which is enough to overcome the friction torque of the bearing and the eccentric gravity of the pressing module 10, and attract the pressing module 10, the gap delta between the limiting block 9 and the pressing module 10 is,
Figure BDA0002749978410000072
wherein L is2Is the distance between the center of the friction plate and the axis of the central shaft, L1The distance between the center of the electromagnet and the axis of the central shaft is X, and the attraction distance of the electromagnet is X.

Claims (9)

1. A shafting locking mechanism for optical measurement equipment is characterized in that: comprises a fixed seat (16), a support bearing (17), a load platform (18) and a plurality of groups of locking units;
the fixed seat (16) is of a sleeve structure; the load platform (18) comprises a rotating shaft (19) and a load mounting plate (20); the load mounting plate (20) is fixedly arranged on the rotating shaft (19) and is used for carrying optical measuring equipment; the rotating shaft (19) is arranged in the cavity of the fixed seat (16) through the supporting bearing (17) and can rotate along the axis of the fixed seat (16);
the locking units are arranged on the outer side of the fixed seat (16) and used for locking the load platform (18), and each locking unit comprises a locking support plate (8), a right support plate (5), a left support plate (6), a pressing module (10), a central shaft (7), a rotary bearing (12), an electromagnet (15), a friction plate (1) and a limiting block (9);
the locking support plate (8) is arranged on the outer side of the fixed seat (16);
the right supporting plate (5) and the left supporting plate (6) are arranged on the locking supporting plate (8), and the end surfaces of the right supporting plate and the left supporting plate are provided with mounting holes;
the pressing module (10) comprises a locking plate (21), a rotating seat (22) and a suction plate (23) which are connected in sequence; the rotating seat (22) is provided with a bearing mounting hole (14), and the weight of the locking plate (21) is greater than that of the suction plate (23);
the central shaft (7) is arranged in a bearing mounting hole (14) of the pressing module (10) through a rotary bearing (12), and two ends of the central shaft respectively penetrate through mounting holes of the right supporting plate (5) and the left supporting plate (6) and are fixedly connected with the right supporting plate (5) and the left supporting plate (6);
the electromagnet (15) is arranged on the locking support plate (8), is positioned below the absorbing plate (23), and is used for generating electromagnetic force for downward movement of the absorbing plate (23) when the electromagnet is electrified;
the friction plate (1) is arranged at the upper end of the locking plate (21), and the upper end surface of the friction plate generates friction torque with the lower end surface of the load mounting plate (20) when the electromagnet (15) is electrified so as to lock the load platform (18);
the limiting block (9) is arranged on the locking support plate (8) and is positioned below the friction plate (1) and used for limiting the downward movement distance of the friction plate (1).
2. The shafting locking mechanism for an optical measuring device according to claim 1, wherein: the rotary bearing (12) comprises two angular contact ball bearings which are arranged back to back, one end of an inner ring of each angular contact ball bearing is limited by a step arranged on the central shaft (7), and the other end of each angular contact ball bearing is pre-tightened by a bearing pressing ring (11) and a locking nut (2).
3. The shafting locking mechanism for an optical measuring device according to claim 2, wherein: the locking mechanism protection cover (3) is arranged on the outer side of the fixing seat (16), and the locking unit is arranged in the locking mechanism protection cover (3).
4. A shafting locking mechanism for an optical measuring apparatus according to claim 1, 2 or 3, wherein: the outer sides of the left supporting plate (6) and the right supporting plate (5) are provided with a locking pressing plate (4) and a fixing screw, and the fixing screw penetrates through the locking pressing plate (4) to connect the left supporting plate (6) and the right supporting plate (5) with the central shaft (7).
5. The shafting locking mechanism for an optical measuring device according to claim 4, wherein: and the end surface of the suction plate (23) is provided with a through suction hole (13).
6. The shafting locking mechanism for an optical measuring device according to claim 5, wherein: the friction plate (1) is a polyurethane rubber material plate.
7. The shafting locking mechanism for an optical measuring device according to claim 6, wherein: the locking units are three groups, four groups or six groups, and are uniformly distributed on the outer side of the fixed seat (16) by taking the axis of the fixed seat (16) as the circle center.
8. The shafting locking mechanism for an optical measuring device according to claim 7, wherein: the clearance between the locking plate (21) and the limiting block (9)
Figure FDA0002749978400000021
Wherein L is2Is the distance between the center of the friction plate and the axis of the central shaft, L1The distance between the center of the electromagnet and the axis of the central shaft is X, and the attraction distance of the electromagnet is X.
9. The shafting locking mechanism for an optical measuring device according to claim 8, wherein: the rotating shaft (19) is a hollow shaft, so that the weight of the whole shafting locking mechanism is reduced.
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