CN110645893A

CN110645893A - Target ball of laser tracker

Info

Publication number: CN110645893A
Application number: CN201910894116.7A
Authority: CN
Inventors: 郑剑和
Original assignee: Suzhou Jiehui Intelligent Measurement Technology Co Ltd
Current assignee: Suzhou Jiehui Intelligent Measurement Technology Co Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-01-03

Abstract

The invention provides a target ball of a laser tracker, which comprises a steel ball substrate, a colloid, a retroreflector and a protection ring, wherein an open accommodating space is formed in the steel ball, the bottom of the accommodating space in the steel ball substrate is coated with the colloid and the retroreflector is fixed by the colloid, the upper part of the accommodating space is provided with a connecting part used for being connected and installed with the protection ring, the protection ring is installed on the top of the accommodating space on the steel ball substrate, the height of the protection ring is higher than that of the retroreflector, the retroreflector is an optical cube-corner retroreflector, and the retroreflector is formed by gluing three optical reflectors. The target ball of the invention has high optical precision and can meet the precision requirement of most measurement operations; the protective capability is strong, the measuring precision of the target ball in the using process is little influenced by the outside, and the high accuracy can be kept for a long time.

Description

Target ball of laser tracker

Technical Field

The invention relates to the technical field of measuring instruments, in particular to a target ball of a laser tracker.

Background

The Laser Tracker (Laser Tracker) is a high-precision large-space three-dimensional measuring instrument, integrates advanced technologies such as a Laser ranging technology, a photoelectric detection technology, a precision mechanical technology, a computer and control technology, a modern numerical calculation theory and the like, tracks a space moving target (target ball) and measures a space three-dimensional coordinate of the target in real time. Generally, the system comprises a high-precision laser ranging module (an ADM absolute ranging module or an additional IFM laser interferometer), an azimuth grating encoder and a servo motor thereof, a pitch grating encoder and a servo motor thereof, a position sensing tracking module, a precision level meter, a meteorological station and the like. The method has the characteristics of high precision, high efficiency, real-time tracking measurement, quick installation, simple and convenient operation and the like, and is widely applied to three-dimensional industrial measurement of large-size objects such as aerospace ship heavy industry wind power automobile machinery and the like.

Target ball, SMR (spherical surface reflector (SMR), also known as spherical hollow retroreflector, the core component is a cubic retroreflector composed of three high-precision mutually perpendicular optical reflecting surfaces, which is formed by gluing three pieces of glass (or processing by aluminum columns), the retroreflector is glued on a perforated high-precision stainless steel ball, reflects the light beam of a laser tracker, provides the target for a laser tracking and ranging system, is similar to a three-coordinate spherical probe, requires the optical center of the retroreflector to coincide with the ball center of the steel ball as much as possible in order to reduce the measurement error caused by the target ball, and has another form of target ball, the optical hollow cubic angle is directly processed on the ball body of the steel ball, is made into three mutually perpendicular mirror surfaces, the surface of the mirror surface is generally processed by coating (gold, silver or aluminum), because there is no mosaic (glass or aluminum) as the reflecting surface, the target ball can thus withstand a certain degree of impact. (to the extent that the surface of the sphere is not damaged).

According to the currently used technology, a high-precision steel ball is generally machined by stainless steel to form a ball body with a cavity, due to the limitation of the machinability of the steel ball in the prior art, the machinability of the steel ball limits the surface hardness of the steel ball to be not too high, the roundness can be adversely affected after the cavity machining, the surface of the steel ball needs to be in contact measurement with a workpiece frequently, the steel ball is easy to wear and cause error increase, and therefore the steel ball is easy to scrap, and the outer surface needs to be machined again to recover the due precision.

The optical retroreflector in the prior art adopts a very expensive device to perform long-period precision processing and complex precision processing on aluminum materials to form an optical reflection mirror surface with extremely high requirements, so that the processing cost is high;

the assembly of the optics with the target sphere ball requires careful adjustment and testing by a high-level technician to glue the optics to the ball. The preparation requirement of the glue is extremely strict, the glue is assembled with high precision, the glue is required to have very high dimensional stability, the shrinkage rate is close to 0, the gluing performance is kept normal in the temperature range of-40 to 60 ℃, and meanwhile, the glue has quite high anti-vibration capability and stripping strength. In the existing gluing technology, the phenomenon of degumming of an optical device occurs, or the error is increased due to the fact that the optical center is greatly deviated after the optical device is used for a period of time, so that the target ball is discarded or only degraded to be used as a defective product.

The target ball is usually used in a common workshop environment, dust, water mist, oil mist and the like are inevitable, and the optical mirror surface is exposed in the use environment and gradually becomes dirty, gradually loses the reflection performance and finally loses the effect. One current protection option is to add a protective glass window at the front end of the optical device, but the negative result is that the measurement accuracy of the system is affected due to the refraction of the glass window to laser, and the error caused by the refraction cannot be accepted in many measurement fields with strict requirements.

Disclosure of Invention

The invention aims to provide a laser tracker target ball, which is used for solving the problems that related products are high in price, long in order period, free of falling protection in the using process, prone to displacement and degumming of optical devices, not resistant to dirt, not prone to cleaning after dirt and the like.

The invention provides a target ball of a laser tracker, which comprises a steel ball substrate, a colloid, a retroreflector and a protection ring, wherein an open accommodating space is formed in the steel ball, the bottom of the accommodating space in the steel ball substrate is coated with the colloid and the retroreflector is fixed by the colloid, the upper part of the accommodating space is provided with a connecting part used for being connected and installed with the protection ring, the protection ring is installed on the top of the accommodating space on the steel ball substrate, the height of the protection ring is higher than that of the retroreflector, and the retroreflector is an optical cube-corner retroreflector.

In one embodiment, the steel ball matrix is formed by performing special processing on a high-precision stainless steel ball, the cross section of the lower half portion of the accommodating space in the steel ball matrix is isosceles trapezoid, and the colloid is coated on the lower half portion of the accommodating space.

In one embodiment, the lower half part of the accommodating space in the steel ball matrix is cylindrical with a round corner at the bottom, and the lower half part of the accommodating space is coated with the colloid.

In one embodiment, the retroreflector is formed by gluing three optical reflectors, and the retroreflector comprises three different optical reflectors which are divided into a first optical reflector, a second optical reflector and a third optical reflector, the first optical reflector, the second optical reflector and the third optical reflector are all in fan shape, the bottom of the first optical reflector is provided with a connecting surface parallel to the bottom of the accommodating space, the second optical reflector is glued on the edge of the reflecting surface of the first optical reflector, the third optical reflector is glued on the edges of the reflecting surfaces of the first optical reflector and the second optical reflector, the reflection surfaces of the first optical reflector, the second optical reflector and the third optical reflector form an optical cube corner, and the reflection coating of the optical reflector is coated with an antifouling coating.

In one embodiment, the retroreflector comprises three optical reflectors with the same specification and the same size, radian and inclination angle, the three optical reflectors are glued with each other to form an optical cube corner, the bottom fulcrums of the three optical reflectors are positioned on the same plane and parallel to the bottom of the accommodating space, and the reflection coating of each optical reflector is coated with an antifouling coating.

In one embodiment, the protection ring comprises a screwing part screwed on a part of the connecting part on the accommodating space, the screwing part is provided with an external thread, the screwing part is provided with an upper end part with an outward opening, the target ball is installed on a target ball extension rod, the target ball extension rod comprises a handle, a telescopic rod installed on the handle and a magnetic suction head installed at the top end of the telescopic rod, the protection ring is provided with an installation hole, a quick-release buckle is installed in the installation hole, and a falling-proof wrist strap is connected through the quick-release buckle.

In one embodiment, the target ball is adsorbed on the magnetic target holder, the magnetic target holder comprises a target holder body and a magnetic body, a cone socket for placing the target ball is arranged at the central point of the target holder body, and the magnetic body is arranged at the bottom of the cone socket.

In one embodiment, the magnetic target holder is a standard target ball magnetic target holder, three support balls arranged in three equal parts are arranged on the upper surface of the target holder body, and the target ball of the laser tracker is placed on the conical socket and is fixedly attracted by the magnetic body below the conical socket.

In one embodiment, the magnetic target holder is a high-precision offset magnetic target holder, a circular bottom plane is arranged at the central point on the conical socket of the target holder body, three symmetrically arranged fan-shaped grooves are arranged on the conical socket along the outer side of the bottom plane, a target ball of a laser tracker is placed on the conical socket of the target holder body, and the distance between the center of the target ball and the bottom plane is a standard offset value.

In one embodiment, the magnetic target holder is a V-shaped opening magnetic target holder with a rod, a circular bottom plane is arranged at the central point on the conical socket of the target holder body, three symmetrically arranged fan-shaped grooves are formed in the conical socket along the outer side of the bottom plane, a V-shaped opening is arranged at one of the fan-shaped grooves, a cylindrical rod is further arranged at the bottom of the target holder body, a target ball of a laser tracker is placed on the conical socket, the distance between the center of the target ball and the bottom plane is a standard offset value, and the distance between the center line of the target ball and the bottom plane is a standard offset value.

The technical scheme of the invention has the beneficial effects that:

1. the steel ball matrix in the technology is formed by processing high-hardness stainless steel balls through electric sparks, the surface hardness is close to HRC60 degrees, and the hardness is close to that of a drill bit or a milling cutter, so that the steel ball matrix has better wear resistance;

2. the retroreflector is formed by assembling optical reflectors which are manufactured in batches relatively quickly, so that the cost is greatly reduced;

3. the mounting of the retroreflector and the steel ball matrix can adopt a unique rapid and batch high-precision assembly mode, so that the assembly efficiency is greatly improved, and the production cost is reduced;

4. the optical precision is high, and the precision requirement of most measurement operations can be met;

5. the protective capability is strong, the measuring precision of the target ball in the using process is little influenced by the outside, and the high accuracy can be kept for a long time.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is a schematic front view of an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic perspective view of a first steel ball matrix according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a first steel ball matrix according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is a schematic perspective view of a second steel ball matrix according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a second steel ball matrix according to an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view taken along line C-C of FIG. 8;

FIG. 10 is a perspective view of a first retroreflector according to an embodiment of the present invention;

FIG. 11 is a top view of a first type of retroreflector in an embodiment of the present invention;

FIG. 12 is a bottom view of the first type of retroreflector in an embodiment of the present invention;

FIG. 13 is a schematic perspective view of a first optical reflector according to an embodiment of the present invention;

FIG. 14 is a bottom view of a first optical reflector in an embodiment of the present invention;

FIG. 15 is a schematic perspective view of a second optical reflector in an embodiment of the present invention;

FIG. 16 is a bottom view of a second optical mirror in an embodiment of the present invention;

FIG. 17 is a schematic perspective view of a second optical reflector in an embodiment of the present invention;

FIG. 18 is a bottom view of a second optical mirror in an embodiment of the present invention;

FIG. 19 is a perspective view of a second retroreflector according to an embodiment of the present invention;

FIG. 20 is a top view of a second type of retroreflector in an embodiment of the present invention;

FIG. 21 is a bottom view of a second type of retroreflector in accordance with embodiments of the present invention;

FIG. 22 is a schematic perspective view of an optical reflector according to an embodiment of the present invention;

FIG. 23 is a top view of an optical mirror in an embodiment of the present invention;

FIG. 24 is a schematic perspective view of a first guard ring according to an embodiment of the present invention;

FIG. 25 is a top view of a first guard ring in accordance with an embodiment of the present invention;

FIG. 26 is a schematic cross-sectional view taken along line D-D of FIG. 25;

FIG. 27 is a schematic perspective view of a second guard ring according to an embodiment of the present invention;

FIG. 28 is a top view of a second guard ring in accordance with an embodiment of the present invention;

FIG. 29 is a schematic cross-sectional view taken along line E-E of FIG. 28;

FIG. 30 is a schematic perspective view of a standard target ball magnetic backing plate according to an embodiment of the present invention;

FIG. 31 is a left side view of a standard target ball magnetic backing plate in an embodiment of the present invention;

FIG. 32 is a top view of a standard target ball magnetic backing plate in an embodiment of the present invention;

FIG. 33 is a schematic perspective view of a high-precision offset magnetic backing plate according to an embodiment of the present invention;

FIG. 34 is a top view of a high precision offset magnetic backing plate in an embodiment of the present invention;

FIG. 35 is a schematic cross-sectional view of a high-precision offset magnetic backing plate in an embodiment of the present invention;

FIG. 36 is a top view of a V-shaped split spindle magnetic backing plate in accordance with an embodiment of the present invention;

FIG. 37 is a right side view of a V-shaped split spindle magnetic target in an embodiment of the present invention;

FIG. 38 is a schematic cross-sectional view of a V-shaped split spindle magnetic backing plate in accordance with an embodiment of the present invention;

FIG. 39 is a Zygo interferogram in an embodiment of the invention;

FIG. 40 is a schematic cross-sectional view of an embodiment of the invention.

In the figure:

1-steel ball matrix; 11-an accommodating space; 12-a connecting part; 2-colloid; 3-a retroreflector; 31-an optical mirror; 311-a first optical mirror; 312-a second optical mirror; 313-a third optical mirror; 4-a guard ring; 41-a swivel part; 42-upper end portion; 5-a magnetic target holder; 51-backing plate body; 511-conical fossa; 5111-bottom plane; 5112-a sector groove; 5113-V-shaped opening; 52-a magnetic body; 53-cylindrical rod.

Detailed Description

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

As shown in fig. 1, 2, 3 and 40, an embodiment of the present invention provides a target ball of a laser tracker, the target ball includes a steel ball base 1, a colloid 2, a retroreflector 3 and a protection ring 4, an open accommodating space 11 is opened inside the steel ball, the colloid 2 is coated on the bottom of the accommodating space 11 inside the steel ball base 1 and the retroreflector 3 is fixed by the colloid 2, a connection portion 12 for connecting and installing the protection ring 4 is arranged on the upper portion of the accommodating space 11, the protection ring 4 higher than the retroreflector 3 is installed on the top of the accommodating space 11 on the steel ball base 1, and in the embodiment of the present invention, the retroreflector 3 is an optical cube corner retroreflector 3.

Specifically, the steel ball matrix 1 is formed by specially processing high-precision stainless steel balls, the diameter error of the steel ball matrix 1 is generally required to be within several microns, the sphericity error is within hundreds of nanometers, and the surface roughness is within tens of nanometers. The steel ball matrix 1 needs to be in surface contact with a workpiece in a large amount in the measuring process, and the wear resistance is required to be as good as possible, the surface hardness of the steel ball matrix 1 is close to HRC60 degrees, and the steel ball matrix 1 also has magnetic conductivity so as to facilitate the target ball to be adsorbed on the zero point position of a laser tracker or the reference point of the workpiece by a magnetic target seat 5 when necessary. As shown in fig. 4, 5 and 6, the section of the lower half part of the accommodating space 11 of the first steel ball substrate 1 is isosceles trapezoid, and the lower half part of the accommodating space 11 is coated with the colloid 2; referring to fig. 7, 8 and 9, in the second steel ball matrix 1, the lower half part of the accommodating space 11 in the steel ball matrix 1 is a cylinder with a rounded corner at the bottom, and the lower half part of the accommodating space 11 is coated with the colloid 2.

In the embodiment of the invention, the optical cube corner retroreflector 3 is a core device of a target ball and is formed by gluing three optical reflectors 31, and the optical center error (the error between the vertex of the cube corner of the retroreflector 3 and the spherical center of a steel ball) is required to be within a few microns; dihedral angle errors, the synthetic angle errors are required to be within a few angular seconds; the central wavefront distortion is required to be within a half wave, and the reflectivity of red light and infrared light is required to be more than 60%; the polarization sensitivity is controlled within 40 percent. The above parameters are checked by interferometer during lens gluing to achieve the best possible position, and after gluing is completed an interferogram report is generated, see fig. 39. As shown in fig. 10 to 18, the first retroreflector 3 includes three different optical mirrors 31, which are divided into a first optical mirror 311, a second optical mirror 312 and a third optical mirror 313, the first optical mirror 311, the second optical mirror 312 and the third optical mirror 313 are all in fan shapes, a connecting surface parallel to the bottom of the accommodating space 11 is disposed at the bottom of the first optical mirror 311, the second optical mirror 312 is glued to the edge of the reflecting surface of the first optical mirror 311, the third optical mirror 313 is glued to the edge of the reflecting surface of the first optical mirror 311 and the second optical mirror 312, and the reflecting surfaces of the first optical mirror 311, the second optical mirror 312 and the third optical mirror 313 form an optical cube angle; as shown in fig. 19 to 23, the retroreflector 3 of the second type includes three optical reflectors 31 with the same specification and the same size, radian and inclination angle, the three optical reflectors 31 are glued together to form an optical cube, and the bottom fulcrums of the three optical reflectors 31 are located on the same plane and parallel to the bottom of the accommodating space 11.

In the above embodiment, in order to improve the adaptability of the target ball to the dust environment in a workshop, an antifouling coating is specially added to the reflective coating of the optical reflector 31, so that the target ball has a certain self-cleaning capability and is more resistant to dirt.

The protection ring 4 is mounted on the top of the accommodating space 11 of the steel ball base 1, the protection ring 4 is higher than the retroreflector 3, the protection ring 4 is a first protection ring 4 as shown in fig. 24 to 26, the protection ring 4 is a second protection ring 4 as shown in fig. 27 to 29, the protection ring 4 comprises a screwing part 41 screwed on the connecting part 12 of the accommodating space 11, the screwing part 41 is provided with external threads, and the screwing part 41 is provided with an upper end part 42 which is opened outwards.

The target ball is absorbed on the zero point position or the workpiece reference point of the laser tracker by the magnetic target holder 5 if necessary, the magnetic target holder 5 comprises a target holder body 51 and a magnetic body 52, a conical socket 511 for placing the target ball is arranged at the central point of the target holder body 51, and the magnetic body 52 is arranged at the bottom of the conical socket 511.

As shown in fig. 30 to 32, the standard target ball magnetic target holder is provided with three support balls arranged in three equal parts on the upper surface of a target holder body 51, a target ball of a laser tracker can be placed on a conical socket 511 of the target ball holder and is attracted and fixed by a magnetic body 52 below the conical socket 511, and a position reference datum point is provided in the detection process of the tracker.

As shown in fig. 33 to 35, a high-precision offset magnetic backing plate is provided, wherein a circular bottom plane 5111 is arranged at the center point of a conical socket 511 of a backing plate body 51, three symmetrically arranged fan-shaped grooves 5112 are arranged on the conical socket 511 along the outer side of the bottom plane 5111, a laser tracker ball is placed on the conical socket 511 of the backing plate body 51, and the distance between the center of the ball and the bottom plane 5111 is a standard offset value, such as 25.400mm, and the error is within 0.005 mm. Such a high precision biased magnetic backing plate 5 provides a precise contact surface for the target ball when inspecting the workpiece plane.

As shown in fig. 36 to 38, the V-shaped opening magnetic target holder with the rod is shown in fig. 38, a round dotted line part is a target ball, a round bottom plane 5111 is arranged at the center point of the conical socket 511 of the target holder body 51, three symmetrically arranged fan-shaped grooves 5112 are arranged on the conical socket 511 along the outer side of the bottom plane 5111, a V-shaped opening 5113 is arranged at one fan-shaped groove 5112, a precise cylindrical rod 53 is further arranged at the bottom of the target holder body 51, a laser tracker target ball is placed on the conical socket 511 of the target holder body 51, the distance between the center of the target ball and the bottom plane 5111 is a standard offset value, and the distance between the center line of the target ball and the bottom plane 5111 is a standard offset value. Such as 25.400mm and 6.000mm, with a tolerance within 0.005 mm. When detecting the plane round hole of the workpiece, the V-shaped opening 5113 with the rod magnetic target seat 5 provides an accurate contact surface for the target ball. In some hole surface areas which cannot be irradiated by laser, the V-shaped opening 5113 with the rod magnetic base expands the hidden area measurement capability of the target ball;

in addition, the target ball can also be arranged on a target ball extension rod, the target ball extension rod comprises a handle, a telescopic rod arranged on the handle and a magnetic suction head arranged at the top end of the telescopic rod, when a large workpiece is measured, the measuring area which can not be touched by a human hand is measured, the target ball extension rod is used, an operator can conveniently operate the target ball extension rod, the working efficiency is improved, and the trouble of finding and raising the device on site is avoided.

In the above embodiment, the protective ring 4 is provided with the mounting hole, the quick-release buckle is installed in the mounting hole, the anti-falling wrist strap for connecting the target ball through the quick-release buckle prevents the target ball from falling on the ground in the process of being taken away and moved by an operator, so that the precision of the target ball is affected.

The optical center error test results are shown in table 1, and in addition, the test on other parameters is shown in fig. 10, fig. 39 is a Zygo interferogram, a Zygo interferometer is adopted to measure multiple indexes of the laser tracker target ball to obtain the result of fig. 39, and the result has detection results such as dihedral angle errors, comprehensive angle errors, central wavefront distortion and the like, which shows that the laser tracker target ball produced by using the target ball tool and the target ball assembling method in the embodiment of the invention meets various test requirements.

Serial number	Mirror type	Numbering	Optical center error/mm
				1	SMR1.5in	JHM6007	0.005
2	SMR0.5in	JHM8027	0.003

TABLE 1

The following description of experimental parameter terms related to target spheres:

dihedral Angle error (Dihedral-Angle error): on the three reflecting surfaces of an ideal cube corner, the angle between two adjacent mirror surfaces is exactly 90 degrees. Whereas the actual cube corner reflecting surfaces always differ from each other by 90 degrees from the theoretical angle, the difference is typically measured in arc seconds. This difference is called dihedral angle error.

Maximum laser integrated angle error (Max Beam development): theoretically, a laser beam should be coaxial with the incident beam and form 180 degrees after being reflected back through the target sphere. Due to the manufacturing error of the retroreflector, the actually reflected light beam always has an error of several arc seconds with the incident light beam, and the errors of the incident light beam and the incident light beam are different, wherein the error of the maximum laser reflection angle is called as the maximum laser synthetic angle error.

Central wavefront distortion: including effects due to flatness of the panel and dihedral angle errors, both of which affect the wavefront of the laser beam returning from the reflector. Since the laser beam reflected by the laser tracker requires the return path, in the reflection area of the target ball, the area with the diameter of about 7mm near the central point is the most concentrated place of the laser beam energy, and the wave front distortion value is the key.

Polarization error: laser light reflected back into the laser, whether inside an Interferometer (IFM) or an Absolute Distance Meter (ADM), may be sensitive to polarization. If the laser tracker is sensitive to polarization, the reflective properties of the mirror coating of the target sphere become important. The target ball therefore requires a relevant quantitative test to know the polarization properties of the produced target ball.

Optical center error: the optical center error is one of the key indicators of the quality of target ball manufacture. It can be decomposed into lateral and longitudinal errors. The lateral error refers to the radius between the orbit circle of the optical reflection center and the target ball rotation center (sphere center point) after the target ball rotates around the axis of the opening circle for a circle at the fixed magnetic base. The longitudinal error is the deviation of the reflection center from the center of the steel ball of the target ball along the axial direction of the opening circle.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Laser tracking appearance target ball, its characterized in that: this target ball contains steel ball base member, colloid, retroreflector and protection ring, open accommodation space has been seted up to the steel ball inside, steel ball base member is inherent the bottom coating of accommodation space has the colloid and by the colloid is fixed the retroreflector, the upper portion of accommodation space be equipped with be used for with the connecting portion that the installation was connected to the protection ring, be in on the steel ball base member the top installation protection ring of accommodation space, the height of protection ring is higher than the retroreflector, the retroreflector is optics cube corner retroreflector.

2. The laser tracker target ball of claim 1, wherein: the steel ball base member is formed by high accuracy stainless steel ball that has wear resistance, has magnetic conductivity through special processing, in the steel ball base member the latter half cross-section of accommodation space is isosceles trapezoid, the latter half coating of accommodation space the colloid.

3. The laser tracker target ball of claim 1, wherein: the lower half part of the containing space in the steel ball substrate is cylindrical, the bottom of the lower half part of the containing space is provided with a round angle, and the lower half part of the containing space is coated with the colloid.

4. The laser tracker target ball of claim 1, wherein: the retroreflector is formed by three optical reflector agglutinates, include the optical reflector of three diverse in the retroreflector, divide into first optical reflector, second optical reflector and third optical reflector, first optical reflector, second optical reflector and third optical reflector all are fan-shaped the bottom of first optical reflector sets up and is on a parallel with the connection face of accommodation space bottom, second optical reflector agglutinates the plane of reflection edge of first optical reflector, third optical reflector agglutinates first optical reflector with the plane of reflection edge of second optical reflector, the plane of reflection of first optical reflector, second optical reflector and third optical reflector forms optics cubic angle, the coating has antifouling coating on the reflection coating of optical reflector.

5. The laser tracker target ball of claim 1, wherein: contain the optical reflection mirror of three the same specifications in the optics retroreflector, have the same size, radian and inclination, three the optical reflection mirror glues each other and forms optical cube angle together, three the bottom fulcrum of optical reflection mirror is in on the coplanar and be on a parallel with the accommodation space bottom, the coating has antifouling coating on the reflective coating of optical reflection mirror.

6. The laser tracker target ball of claim 1, wherein: the protection ring is including connecing soon the portion of connecing soon of the upper portion connecting portion of accommodation space, connect soon and have the external screw thread on the portion of connecing be provided with the outside upper end of opening on connecting soon, the target ball is installed on the target ball extension rod, the target ball extension rod contains the handle, installs telescopic link on hand, install the magnetic suction head on telescopic link top, the mounting hole has been seted up on the protection ring, install the quick detach buckle in the mounting hole, through the quick detach buckle is connected with prevents falling the wrist strap.

7. The laser tracker target ball of claim 1, wherein: the target ball adsorbs on the magnetism target stand, the magnetism target stand contains target stand body and magnetic substance the central point department of target stand body offers the awl nest that is used for placing the target ball, the magnetic substance sets up awl nest bottom.

8. The laser tracker target ball of claim 7, wherein: the magnetic target holder is a standard target ball magnetic target holder, three support balls which are arranged in three equal parts are arranged on the upper surface of the target holder body, and the target ball of the laser tracker is placed on the conical nest and is fixedly attracted by the magnetic body below the conical nest.

9. The laser tracker target ball of claim 7, wherein: the magnetic target holder is a high-precision offset magnetic target holder, the central point of the target holder body on the conical nest is provided with a circular base plane, the conical nest is followed, the outer side of the base plane is provided with three symmetrical fan-shaped grooves, a target ball of the laser tracker is placed on the conical nest of the target holder body, and the distance between the center of the target ball and the base plane is a standard offset value.

10. The laser tracker target ball of claim 7, wherein: the magnetic target holder is a V-shaped opening magnetic target holder with a rod, a central point on a conical nest of the target holder body is provided with a circular bottom plane, sector grooves which are symmetrically arranged are formed in the outer side of the bottom plane along the upper edge of the conical nest, one of the sector grooves is provided with a V-shaped opening, a cylindrical rod is further arranged at the bottom of the target holder body, a target ball of a laser tracker is placed on the conical nest, the distance between the center of the target ball and the bottom plane is a standard offset value, and the distance between the center line of the target ball and the bottom plane is a standard offset value.