CN110947987A

CN110947987A - Three-jaw chuck mechanism for measuring device

Info

Publication number: CN110947987A
Application number: CN201911316109.5A
Authority: CN
Inventors: 曹佃生; 林冠宇; 张子辉; 李炳强; 李继峰
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: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-04-03
Anticipated expiration: 2039-12-19
Also published as: CN110947987B

Abstract

The utility model provides a three-jaw chuck mechanism for measuring device is last belongs to optical measurement auxiliary instrument technical field, and aim at solves the difficult control problem that causes the camera lens to damage easily of clamp force that prior art exists. The invention comprises the following steps: the chuck comprises a chuck body, a chuck base and a chuck body, wherein the chuck body at least comprises one chuck base; three groups of clamping bodies are circumferentially and uniformly distributed on the chuck base, and each group of clamping bodies at least comprises a clamping jaw which is in sliding fit with the chuck base along the radial direction; and the motion driving mechanism is a synchronous belt driving mechanism and drives three clamping jaws of the three groups of clamping bodies to synchronously move through the motion driving mechanism. The invention uses a structural form that the synchronous belt drives the three belt wheels to carry out synchronization and the linear guide rail to carry out guiding, and can realize self-centering clamping operation with higher precision. The synchronous belt has certain elastic deformation capacity, the clamping force can be manually controlled, and overlarge clamping force cannot be generated.

Description

Three-jaw chuck mechanism for measuring device

Technical Field

The invention belongs to the technical field of optical measurement auxiliary instruments, and particularly relates to a three-jaw chuck mechanism for a measuring device.

Background

The three-jaw chuck has good self-centering property, so that the three-jaw chuck is widely applied to clamping workpieces of equipment such as a lathe and the like in the field of machining. The traditional three-jaw chuck is driven by plane threads and bevel gears, so that three clamping jaws uniformly distributed on the circumference are close to or far away from the center of the chuck at the same time, and workpieces with different diameters are clamped. In order to ensure the firmness of a workpiece, the three-jaw chuck for the machine tool generally has a large clamping force so as to ensure that the workpiece is not loosened in the machining process. In some lens measuring devices (such as a centering instrument), the lens to be measured needs to be clamped and fixed and rotate along with the turntable, and in such a use case, the clamping force needs not to be too large, because the wall thickness of the lens is generally thin, and the excessive clamping force can damage optical elements in the lens. The three-jaw chuck with the plane thread structure is difficult to control the locking force, easily causes lens damage, and is not suitable for a measuring device.

Disclosure of Invention

The invention aims to provide a three-jaw chuck mechanism for a measuring device, which solves the problem that in the prior art, the lens is easy to damage due to the fact that clamping force is difficult to control.

In order to achieve the above object, a three-jaw chuck mechanism for a measuring apparatus of the present invention comprises:

the chuck comprises a chuck body, a chuck base and a chuck body, wherein the chuck body at least comprises one chuck base;

three groups of clamping bodies are circumferentially and uniformly distributed on the chuck base, and each group of clamping bodies at least comprises a clamping jaw which is in sliding fit with the chuck base along the radial direction;

and the motion driving mechanism is a synchronous belt driving mechanism and drives three clamping jaws of the three groups of clamping bodies to synchronously move through the motion driving mechanism.

Every group the clamping body still includes motion guiding mechanism, motion guiding mechanism includes:

two linear guide rails which are fixed on the chuck base and are parallel to the motion direction of the clamping jaws;

and the sliding block connecting seat is fixedly connected with the sliding block of the linear guide rail, and the middle position of the upper end surface of the sliding block connecting seat is fixedly connected with the clamping jaw.

The motion drive mechanism includes:

the clamping device comprises three belt wheels, wherein one belt wheel is arranged between two linear guide rails of each clamping body, and the belt wheels are far away from the center of a chuck base;

the clamping device comprises three tensioning wheels, wherein a tensioning wheel is arranged between every two adjacent clamping bodies and is close to the center of a chuck base;

the synchronous belt is wound around the three belt wheels and the three tension wheels in a staggered manner to form a closed belt structure; one side of the synchronous belt on two sides of the belt wheel between the two linear guide rails in the same clamping body is fixedly connected with the sliding block connecting seat in the corresponding clamping body.

The chuck body further comprises a shell, the shell is arranged above the chuck base, three radial adjusting grooves are uniformly distributed on the circumference of the upper surface of the shell, and the clamping body and the motion driving mechanism are located between the shell and the chuck base; three clamping jaws of the three clamping bodies respectively penetrate out of the three adjusting grooves and are in sliding fit with the adjusting grooves.

The invention has the beneficial effects that: the invention provides a three-jaw centering mechanism for guiding jaws and driving a synchronous belt based on a linear guide rail. The clamping jaws can be close to or far away from the center of the chuck under the constraint of the linear guide rail to clamp or loosen the lens, and the operation straightness accuracy and repeatability of the clamping jaws are high due to the fact that the operation straightness of the linear guide rail is high. Three synchronous belt wheels are driven through a closed synchronous belt, three clamping jaws are driven to be close to and far away from the chuck at the same time, and the accuracy of the center position when lenses with different diameters are clamped is guaranteed. Simultaneously, because the hold-in range has certain elasticity, all is softer than the metal outer wall of general camera lens, consequently can not damage the camera lens generally, more is fit for being arranged in the centering of measuring equipment and presss from both sides tight application.

The three-jaw chuck mechanism of the invention uses a structural form that the synchronous belt drives the three belt wheels to carry out synchronization and the linear guide rail to carry out guiding, and can realize self-centering clamping operation with higher precision. The synchronous belt has certain elastic deformation capacity, the clamping force can be manually controlled, excessive clamping force cannot be generated, and the clamped lens has a certain protection effect. Synchronous belts, synchronous belt wheels, linear guide rails and the like used by the mechanism are standard parts, and the mechanism structure using plane threads is simpler and more convenient.

Drawings

FIG. 1 is a schematic diagram of a three-jaw chuck mechanism for use with a measuring device according to the present invention;

FIG. 2 is a schematic diagram of the overall structure of a three-jaw chuck mechanism used in a measuring device according to the present invention;

FIG. 3 is a schematic view of a hidden housing of a three-jaw chuck mechanism for use in a measuring device according to the present invention;

wherein: 1. the lens clamping device comprises a chuck body, 101, a chuck base, 102, a shell, 103, an adjusting groove, 2, a clamping body, 201, a clamping jaw, 202, a linear guide rail, 203, a sliding block connecting seat, 3, a motion driving mechanism, 301, a belt wheel, 302, a tension wheel, 303, a synchronous belt, 4 and a clamped lens.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

Referring to fig. 1-3, a three-jaw chuck mechanism for use with a measuring device according to the present invention comprises:

the chuck comprises a chuck body 1, wherein the chuck body 1 at least comprises a chuck base 101;

three groups of clamping bodies 2 are circumferentially and uniformly distributed on the chuck base 101, and each group of clamping bodies 2 at least comprises a clamping jaw 201 which is in sliding fit with the chuck base 101 along the radial direction;

and the motion driving mechanism 3 is a synchronous belt 303 driving mechanism, and the motion driving mechanism 3 drives three claws 201 of the three groups of clamping bodies 2 to synchronously move.

Every group the clamping body 2 still includes the motion guiding mechanism, the motion guiding mechanism includes:

two linear guide rails 202 which are fixed on the chuck base 101 and are parallel to the moving direction of the jaws 201;

and a slider connecting seat 203 fixedly connected with the slider of the linear guide 202, wherein the middle position of the upper end surface of the slider connecting seat 203 is fixedly connected with the clamping jaw 201.

The motion drive mechanism 3 includes:

three belt pulleys 301, wherein one belt pulley 301 is arranged between the two linear guide rails 202 of each clamping body 2, and the belt pulley 301 is far away from the center of the chuck base 101;

a tensioning wheel 302 is arranged between two adjacent clamping bodies 2, and the tensioning wheel 302 is close to the center of the chuck base 101;

the synchronous belt 303 is wound around the three belt wheels 301 and the three tension wheels 302 in a staggered mode to form a closed belt structure; one side of the synchronous belt 303 at both sides of the pulley 301 between the two linear guide rails 202 in the same clamping body 2 is fixedly connected with the slider connecting seat 203 in the corresponding clamping body 2.

The chuck body 1 further comprises a shell 102, the shell 102 is arranged above the chuck base 101, three radial adjusting grooves 103 are uniformly distributed on the circumference of the upper surface of the shell 102, and the clamping body 2 and the movement driving mechanism 3 are both positioned between the shell 102 and the chuck base 101; the three claws 201 of the three clamping bodies 2 respectively penetrate out of the three adjusting grooves 103 and are in sliding fit with the adjusting grooves 103.

The three groups of clamping bodies 2 are driven by a motion driving mechanism 3. The jaws 201 are fixed to the slider coupling seats 203, and the slider coupling seats 203 are coupled to the moving sliders on the linear guide 202, so that the jaws 201 can linearly reciprocate along the linear guide 202 to be close to or far from the center of the chuck base 101.

The pulleys 301 in the motion-driving mechanism 3 of the present invention have the same parameters including physical dimensions, materials and mounting means. The three pulleys 301 are driven by the same closed timing belt 303, and the timing belt 303 and the pulleys 301 have the same pitch, so that the three pulleys 301 can rotate synchronously. Hold-in range 303 is connected with three slider connecting seat 203 respectively, the rotation of arbitrary one band pulley 301, all can drive other two band pulleys 301 synchronous rotation through hold-in range 303, hold-in range 303 will drive the synchronous rectilinear motion of being of slider connecting seat 203 of connecting, equidistant being close to or keeping away from the center of chuck base 101 simultaneously, three jack catch 201 also can be synchronous be close to or keep away from the center of chuck base 101, the completion is pressed from both sides from the centering clamp of tight camera lens 4 and is pressed from both sides or relax.

The running straightness of the linear guide rail 202 can reach +/-0.01 mm, therefore, the movement of the jaws 201 can also realize the same straightness, and high self-centering repeatability can be realized under the drive of the same synchronous belt 303.

The tension pulley 302 can be used for adjusting the tightness of the synchronous belt 303 so as to match the length of the synchronous belt 303 between two adjacent belt pulleys 301, complete meshing of the synchronous belt 303 and three belt pulleys 301 is realized, and the transmission precision and stability are improved.

The synchronous belt 303 has a certain elasticity, and is softer than a metal material generally used for the outer wall of the lens, so that the outer wall of the measured lens cannot be damaged in the clamping process, and a certain protection effect can be achieved.

Claims

1. A three-jaw chuck mechanism for use on a measuring device, comprising:

a chuck body (1), said chuck body (1) comprising at least one chuck base (101);

it is characterized by also comprising:

three groups of clamping bodies (2) are circumferentially and uniformly distributed on the chuck base (101), and each group of clamping bodies (2) at least comprises a clamping jaw (201) which is in sliding fit with the chuck base (101) along the radial direction;

and the motion driving mechanism (3) is a synchronous belt (303) driving mechanism, and the motion driving mechanism (3) drives three clamping jaws (201) of the three groups of clamping bodies (2) to synchronously move.

2. A three-jaw chuck mechanism for use on measuring devices according to claim 1, characterized in that each set of gripping bodies (2) further comprises a movement guiding mechanism comprising:

two linear guide rails (202) which are fixed on the chuck base (101) and are parallel to the moving direction of the jaws (201);

and the sliding block connecting seat (203) is fixedly connected with the sliding block of the linear guide rail (202), and the middle position of the upper end surface of the sliding block connecting seat (203) is fixedly connected with the clamping jaw (201).

3. A three-jaw chuck mechanism for use on a measuring device according to claim 2, characterized in that said kinematic driving mechanism (3) comprises:

the clamping device comprises three belt wheels (301), wherein one belt wheel (301) is arranged between two linear guide rails (202) of each clamping body (2), and the belt wheel (301) is far away from the center of the chuck base (101);

the clamping device comprises three tensioning wheels (302), wherein one tensioning wheel (302) is arranged between two adjacent clamping bodies (2), and the tensioning wheels (302) are close to the center of a chuck base (101);

the synchronous belt (303) is wound around the three belt wheels (301) and the three tension wheels (302) in a staggered mode to form a closed belt structure; one side of a synchronous belt (303) on two sides of a belt wheel (301) between two linear guide rails (202) in the same clamping body (2) is fixedly connected with a sliding block connecting seat (203) in the corresponding clamping body (2).

4. The three-jaw chuck mechanism used on the measuring device according to any one of the claims 1 to 3, characterized in that the chuck body (1) further comprises a housing (102), the housing (102) is arranged above the chuck base (101), three radial adjusting grooves (103) are uniformly distributed on the circumference of the upper surface of the housing (102), and the clamping body (2) and the motion driving mechanism (3) are positioned between the housing (102) and the chuck base (101); three clamping jaws (201) of the three clamping bodies (2) respectively penetrate out of the three adjusting grooves (103) and are in sliding fit with the adjusting grooves (103).