阅读说明：本技术 一种激光跟踪仪基站标定装置 (Laser tracker basic station calibration device ) 是由 李海涛 张譍之 于 2019-09-12 设计创作，主要内容包括：一种激光跟踪仪基站标定装置,包含三个部分,上调整装置包括与下调整装置相连的法兰一,法兰一上部连接有承载基座二,承载基座二上固定有步进电机二,并且固定有心轴二,心轴二通过死顶尖装配体二与活动端顶尖装配体二实现定位；下层调整装置包括承载基座一,承载基座一上固定有步进电机一,并且固定有心轴一,心轴一通过死顶尖装配体一与活动端顶尖装配体一实现定位；下调整装置中的心轴一套入上调整装置中的法兰一,实现上调整装置和下调整装置的安装；下调整装置中的承载基座一的底部有用于与球铰链装配体连接的螺纹孔,球铰链装配体通过螺纹连接与下调整装置实现装配。本发明可以实现数控加工中心检测时对基准点的位置精度校准。(a laser tracker base station calibration device comprises three parts, wherein an upper adjusting device comprises a first flange connected with a lower adjusting device, the upper part of the first flange is connected with a second bearing base, a second stepping motor is fixed on the second bearing base, and a second mandrel is fixed on the second bearing base and is positioned through a second dead center assembly body and a second movable end center assembly body; the lower layer adjusting device comprises a first bearing base, a first stepping motor is fixed on the first bearing base, a first mandrel is fixed on the first bearing base, and the first mandrel is positioned through a first dead center assembly and a first movable end center assembly; a first mandrel in the lower adjusting device is sleeved into a first flange in the upper adjusting device, so that the upper adjusting device and the lower adjusting device are installed; and the bottom of the bearing base I in the lower adjusting device is provided with a threaded hole for connecting with the ball hinge assembly body, and the ball hinge assembly body is connected with the lower adjusting device through threads to realize assembly. The invention can realize the position precision calibration of the datum point during the detection of the numerical control machining center.)

1. A laser tracker base station calibration device is characterized by comprising three parts, namely a lower adjusting device, an upper adjusting device and a ball hinge assembly body (35) arranged on a machine tool spindle;

The upper adjusting device comprises a first flange (13) connected with the lower adjusting device, the upper part of the first flange (13) is connected with a second bearing base (14), a second stepping motor (27) is fixed on the second bearing base (14), and a second spindle (20) is fixed on the second bearing base (14), and the second spindle (20) is positioned through a second dead center assembly (17) and a second movable end center assembly (32);

The lower layer adjusting device comprises a first bearing base (3), a first stepping motor (1) is fixed on the first bearing base (3), a first mandrel (9) is fixed on the first bearing base, and the first mandrel (9) is positioned through a first dead center assembly (10) and a first movable end center assembly (6);

a first mandrel (9) in the lower adjusting device is sleeved into a first flange (13) in the upper adjusting device, so that the upper adjusting device and the lower adjusting device are installed; the bottom of a bearing base I (3) in the lower adjusting device is provided with a threaded hole used for being connected with a ball hinge assembly body (35), and the ball hinge assembly body (35) is connected with the lower adjusting device through threads to realize assembly.

2. The base station calibration device of the laser tracker according to claim 1, wherein the first bearing base (3) is provided with a first precision ball (8) and a second precision ball (11) for determining a movement position.

3. The base station calibration device of the laser tracker according to claim 1, wherein a third precision ball (21) for determining the movement position is mounted on the second spindle (20).

4. The base station calibration device of the laser tracker according to claim 1, wherein a first ball bowl (15), a second ball bowl (23) and a third ball bowl (28) for limiting the recording of the position of a precise ball are mounted on the second bearing base (14); wherein the first ball bowl (15) and the second ball bowl (23) are symmetrically arranged on two sides of the second mandrel (20).

5. the base station calibration device of the laser tracker according to claim 4, wherein the first ball bowl (15) is installed on the first adjusting block (16), the second ball bowl (23) is installed on the second adjusting block (24), the third ball bowl (28) is installed on the adjusting block (29), and the first adjusting block (16), the second adjusting block (24) and the adjusting block (29) are all installed on the second bearing base (14).

6. The base station calibration device of the laser tracker according to claim 1, wherein the first flange (13) is connected with the first mandrel (9).

Technical Field

The invention relates to the technical field of photoelectric detection, in particular to a laser tracker base station calibration device.

Background

The general checking mode of the positioning error of the numerical control machining center comprises instruments such as a laser tracker and the like and a measuring method, although the laser tracker has timeliness in operation and measurement timeliness, coordinates used for measuring by the laser tracker are machine tool reading coordinates, whether machine tool coordinate reading is actual position coordinate reading cannot be verified, and the measuring method of the instruments cannot effectively overcome self errors of a main shaft of the numerical control machining center, so that the measuring accuracy is insufficient.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a laser tracker base station calibration device which is based on a laser tracking principle and matched with a measurement method, and can realize the position precision calibration of a reference point during the detection of a numerical control machining center.

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

A laser tracker base station calibration device comprises three parts, namely a lower adjusting device, an upper adjusting device and a ball hinge assembly 35 arranged on a machine tool spindle;

The upper adjusting device comprises a first flange 13 connected with the lower adjusting device, the upper part of the first flange 13 is connected with a second bearing base 14, a second stepping motor 27 is fixed on the second bearing base 14, and a second spindle 20 is fixed on the second bearing base, and the second spindle 20 is positioned through a second dead center assembly 17 and a second movable end center assembly 32;

The lower layer adjusting device comprises a bearing base I3, a stepping motor I1 is fixed on the bearing base I3, a mandrel I9 is fixed on the bearing base I3, and the mandrel I9 is positioned through a dead center assembly I10 and a movable end center assembly I6;

A first mandrel 9 in the lower adjusting device is sleeved into a first flange 13 in the upper adjusting device, so that the upper adjusting device and the lower adjusting device are installed; the bottom of a bearing base I3 in the lower adjusting device is provided with a threaded hole used for being connected with a ball hinge assembly body 35, and the ball hinge assembly body 35 is connected with the lower adjusting device through threads to realize assembly.

The bearing base I3 is provided with a precision ball I8 and a precision ball II 11 which are used for determining the movement position.

and a precise ball III 21 for determining the movement position is arranged on the mandrel II 20.

the bearing base II 14 is provided with a first ball bowl 15, a second ball bowl 23 and a third ball bowl 28 which are used for limiting the recording of the position of a precise ball; wherein the first ball bowl 15 and the second ball bowl 23 are symmetrically arranged on two sides of the second mandrel 20.

The first ball bowl 15 is installed on the first adjusting block 16, the second ball bowl 23 is installed on the second adjusting block 24, the third ball bowl 28 is installed on the adjusting block 29, and the first adjusting block 16, the second adjusting block 24 and the adjusting block 29 are all installed on the second bearing base 14.

The flange one 13 is connected with the mandrel one 9.

The invention has the beneficial effects that:

The measuring and positioning device based on the laser tracking principle overcomes the systematic error in the prior measuring technology, and can accurately measure the geometric error of the numerical control machining center; a new coordinate system is established, so that the influence on measurement caused by the error of the numerical control machining center in the measurement process is effectively avoided, and the measurement precision is improved; the data can be cooperatively processed by a computer, so that the automation of measurement is realized.

Drawings

fig. 1 is a schematic structural diagram of a lower half part of the reference calibration device.

Fig. 2 is a schematic structural diagram of an upper half part of the reference calibration device.

Fig. 3 is a schematic structural diagram of an upper half part of the reference calibration device according to the present invention.

fig. 4 is a schematic diagram of the overall structure of the reference calibration device of the present invention.

FIG. 5 is a schematic diagram of four extreme positions of the target mirror of the reference calibration apparatus of the present invention.

Wherein: 1, 2, a first motor base, 3, a first bearing base, 4, a first adjusting screw rod, 5, a first bearing base, 6, a first movable end tip assembly, 7, a second bearing base, 8, a first precision ball, 9, a first spindle, 10, a first dead tip assembly, 11, a second precision ball, 12, a first friction wheel, 13, a first flange, 14, a second bearing base, 15, a first ball bowl, 16, a first adjusting block, 17, a second dead tip assembly, 18, a second flange, 20, a second spindle, 21, a third precision ball, 22 target lens, 23, a second ball bowl, 24, a second adjusting block, 25, a second friction wheel, 26, a second motor base, 27, a second ball bowl, 28, a third adjusting block, 29, a second bearing base, 31, a second adjusting screw rod, 32, a second movable end tip assembly, 33, a fourth adjusting block, 34, a fourth ball bowl and 35.

Detailed Description

the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, when assembling, the lower half part of the reference calibration device is firstly assembled with a motor base I2 on a bearing base I3 through screws, and then a stepping motor I1 is assembled and fixed on the motor base I2; clamping and positioning the mandrel 9 by using the movable end center assembly body 6 and the dead center assembly body 10, so that the mandrel I9 is successfully butted with a friction wheel I12 connected to the motor base I2; in addition, a first adjusting lead screw 4 forms a lead screw nut pair by connecting a bearing seat I5, a first movable center assembly 10 and a bearing seat II 7, the first adjusting lead screw 4 is rotated, the adjustment of the first movable center assembly 10 is realized to complete the clamping and positioning of the mandrel 9, and meanwhile, a first precision ball 8 and a second precision ball 11 which are used for measuring and positioning are connected and arranged on the first bearing base 3 through threads; the ball hinge assembly 35 is connected with the first bearing base 3 through threaded connection;

referring to fig. 2 and 3, in the upper half part of the reference calibration device, when assembling, a first flange 13 is firstly installed below a second bearing base 14 and is used for being connected with a first spindle 9; then, the second motor base 26 and the second stepping motor 27 are connected through screws and then fixed with the second bearing base 14; in addition, the clamping mode of the second mandrel 20 is similar to that of the first mandrel 9, and the second live center assembly 32 and the second dead center assembly 17 are used for clamping and fixing, wherein the second live center assembly 32 can also be used for adjusting the position through the second adjusting screw rod 31 so as to clamp and fix the second mandrel 20; the second mandrel 20 is connected with a second flange 19, and the second flange 19 is connected with the workbench 18 connected with the target lens 22 through screws; two sides of the second mandrel 20 are provided with a second adjusting block 24 and a first adjusting block 16 which are fixed through screws, the two adjusting blocks are respectively used for adjusting the positions of a second ball bowl 23 and a first ball bowl 15, and the second ball bowl 23 and the first ball bowl 15 are used for recording the position of a precise ball 21 which is fixed with the second mandrel 20 through screws when the second mandrel 20 rotates; a third ball bowl 28 is also fixed on an adjusting block 29 at the rear part of the second motor base 26, and the third ball bowl 28 is used for bearing the second precision ball 11; an adjusting block four 33 for adjusting a ball bowl four 34 is also fixed at the lower part of the bearing base two 14, wherein the ball bowl four 34 is used for bearing the precision ball one 8.

The measurement method of use of the device is described below with reference to fig. 4 and 5:

Referring to fig. 4, which is a schematic diagram of the overall structure of the reference calibration device of the present invention, after the device is assembled, the device is connected to the measured numerical control machining center spindle through a ball hinge assembly 35. Next, the measurement of the reference point is performed, and fig. 4 is the initial position of the measurement device

(1) calibrating geometric parameters of the base station calibrator by using the ultrahigh-precision three-coordinate calibration to obtain the distance, the perpendicularity and the like between the first mandrel 9 and the second mandrel 20;

(2) establishing a coordinate system of a base station calibrator, and deducing four spatial positions of the target lens according to geometric parameters of the base station calibrator, wherein the four spatial positions are shown in FIG. 5;

(3) installing a base station calibration instrument and a main shaft, adjusting the posture of the calibration instrument, and adjusting the ball hinge assembly 35 to complete the alignment between the base station calibration instrument and the laser tracker;

(4) The distance reading at the initial position is recorded using a laser tracker and recorded as l₁Coordinate p₁(x₁,y₁,z₁) (ii) a The input of a signal to the second stepping motor 27 will also cause the second friction wheel 25 to drive the second spindle 20 to rotate counterclockwise, and the rotation of the second spindle 20 will cause the third precision ball 21 to rotate from the first position in the second bowl 23 to the first bowl 15, thereby generating a second position of the target 22, which is measured by the laser tracker and recorded as a distance l₂Coordinate p₂(x₂,y₂,z₂) (ii) a Inputting a signal to the first stepping motor 1, rotating the first spindle 9 anticlockwise to change the position of the first precision ball 8, matching the first precision ball 8 with the fourth ball bowl 34 to generate a third position of the target lens 22, and recording the distance asl₃Coordinate p₃(x₃,y₃,z₃) Inputting a signal to the second stepping motor 27 to rotate the second spindle 20 clockwise to drive the third precision ball 21 to move into the second ball bowl 23, and recording the distance l between the target lens 22 and the second precision ball by using the laser tracker₄coordinate p₄(x₄,y₄,z₄) This is the fourth position.

(5) Data analysis is carried out, after the distances of the four extreme position points shown in figure 5 are measured, by utilizing the GPS positioning principle,

Using the formula for the distance between two pointsA ternary high-order nonlinear redundancy equation set can be obtained:

P (x, y, z) was obtained.

in conclusion, the base station calibration device has good positioning precision, can effectively eliminate errors carried by a numerical control machining center, better completes measurement of the positioning errors of the numerical control machining center, and completes high-precision, quick and effective measurement.