A vertical error detection device for the pitch axis and azimuth axis of a laser tracker

Abstract

The present disclosure provides a device for detecting the verticality error of the pitch axis and azimuth axis of a laser tracker, comprising: a first cylindrical inspection rod, a second cylindrical inspection rod and a projection image measuring instrument; the first cylindrical inspection rod and the second cylindrical inspection rod are respectively arranged on the pitch axis on both sides of the laser tracker; the projection image measuring instrument comprises: a transmitter and a receiver, the first cylindrical inspection rod is arranged between the transmitter and the receiver; the transmitter is used to emit LED light to irradiate the first cylindrical inspection rod, and the receiver is used to display the light and shadow formed after the LED light is partially blocked by the first cylindrical inspection rod or the second cylindrical inspection rod, so as to obtain the central axis position of the first cylindrical inspection rod and the second cylindrical inspection rod; according to the central axis position deviation of the first cylindrical inspection rod and the second cylindrical inspection rod and the detection end face distance, the verticality error of the pitch axis and the azimuth axis of the laser tracker is obtained. The present disclosure also provides a method for detecting the verticality error of the pitch axis and the azimuth axis of a laser tracker.

Description

Technical Field

[0001] The present disclosure relates to the field of instrument measurement and calibration, and in particular to a device and method for detecting verticality errors of a pitch axis and an azimuth axis of a laser tracker. Background Art

[0002] Laser tracker is a new type of large-scale space measurement instrument, which is widely used in large-scale equipment manufacturing fields such as aerospace, energy machinery, and large scientific facilities.

[0003] At present, there are few manufacturers of laser trackers in China, and there are also very limited technical patents and literature reports on methods for detecting and adjusting geometric structure errors of trackers. Some literature or patents have studied the calibration methods and devices for the verticality of the pitch axis and azimuth axis, and the verticality and intersection errors of the optical axis and azimuth axis of the laser tracker. In the geometric structure of the laser tracker, the pitch axis and the azimuth axis are the key axis systems of the tracker. The pitch axis, azimuth axis and optical axis need to intersect and be perpendicular to each other. The azimuth axis can carry the tracking head to rotate in the horizontal direction, and the pitch axis can rotate the tracking head in the vertical direction. The two work together to enable the tracker to rotate in three dimensions within the measurement space. Ideally, the azimuth and pitch axes of the tracker should intersect and be perpendicular. However, due to processing and assembly errors in the mechanical structure, the pitch axis of the tracker is not perpendicular to the azimuth axis, that is, the pitch axis and the azimuth axis are tilted to each other at a certain angle. This tilt angle is called the verticality error of the pitch axis and the azimuth axis. This error causes the tracker beam to deviate from the ideal position, thereby generating a measurement error.

[0004] Therefore, it is necessary to study high-precision detection methods to detect the verticality errors of the tracker's pitch axis and azimuth axis, so as to facilitate the precise adjustment and error correction of the tracker's axis system. Summary of the invention

[0005] In order to solve the above problems in the prior art, the present disclosure provides a verticality error detection device for the pitch axis and azimuth axis of a laser tracker, aiming to provide a detection device and a detection method for extracting the axial position of the pitch axis of a tracker with non-contact measurement, simple operation and high accuracy.

[0006] The first aspect of the present disclosure provides a device for detecting the verticality error of the pitch axis and the azimuth axis of a laser tracker, comprising: a first cylindrical test rod, a second cylindrical test rod and a projection image measuring instrument; wherein the first cylindrical test rod and the second cylindrical test rod are respectively arranged on the pitch axis on both sides of the laser tracker; the projection image measuring instrument comprises: a transmitter and a receiver, wherein the first cylindrical test rod is arranged between the transmitter and the receiver; wherein the transmitter is used to emit LED light to irradiate the first cylindrical test rod, and the receiver is used to display the light and shadow formed after the LED light is partially blocked by the first cylindrical test rod or the second cylindrical test rod, so as to obtain the central axis position of the first cylindrical test rod and the second cylindrical test rod; according to the central axis position deviation of the first cylindrical test rod and the second cylindrical test rod and the detection end face distance, the verticality error of the pitch axis and the azimuth axis of the laser tracker is obtained.

[0007] Furthermore, the first cylindrical inspection rod and the second cylindrical inspection rod are respectively connected to the end faces of the pitch axis on both sides of the laser tracker through adapters; wherein the adapter is used to adjust the orientation of the first cylindrical inspection rod and / or the second cylindrical inspection rod.

[0008] Furthermore, the detection end surface distance is the distance between the detection end surface of the first cylindrical detection rod and the detection end surface of the second cylindrical detection rod.

[0009] Furthermore, the vertical reference line and the horizontal reference line of the receiver remain unchanged during the detection process of the detection device.

[0010] Furthermore, the diameters of the first cylindrical inspection rod and the second cylindrical inspection rod are the same.

[0011] Furthermore, it also includes: a first support frame for fixing and supporting the transmitter; and a second support frame for fixing and supporting the receiver.

[0012] Furthermore, the LED light emitted by the transmitter is perpendicular to the pitch axis of the laser tracker.

[0013] Furthermore, the verticality errors of the pitch axis and azimuth axis of the laser tracker satisfy the following relationship:

[0014] θ=arctan(|AB| / CD)

[0015] Among them, θ represents the verticality error of the pitch axis and azimuth axis of the laser tracker; A represents the value corresponding to the central axis position of the first cylindrical inspection rod; B represents the value corresponding to the central axis position of the second cylindrical inspection rod; CD represents the detection end face distance.

[0016] The second aspect of the present disclosure provides a method for detecting the verticality error of the pitch axis and the azimuth axis of a laser tracker, comprising: installing the first cylindrical test rod and the second cylindrical test rod in the verticality error detection device for the pitch axis and the azimuth axis of the laser tracker provided by the first aspect of the present disclosure on the pitch axis on both sides of the laser tracker, and the first cylindrical test rod is set between the transmitter and the receiver; using the transmitter to emit LED light to irradiate the first cylindrical test rod, so that the receiver displays the light and shadow formed after the LED light is partially blocked by the first cylindrical test rod, and obtains the central axis position of the first cylindrical test rod; rotating the laser tracker 180° around its azimuth axis, so that the receiver displays the light and shadow formed after the LED light is partially blocked by the second cylindrical test rod, and obtains the central axis position of the second cylindrical test rod; according to the central axis position deviation of the first cylindrical test rod and the second cylindrical test rod and the detection end face distance, the verticality error of the pitch axis and the azimuth axis of the laser tracker is obtained.

[0017] Furthermore, the method also includes: adjusting the orientation of the first cylindrical inspection rod and the second cylindrical inspection rod by adjusting the displacement and angle of the first adapter and / or the second adapter so that the central axis of the first cylindrical inspection rod and the second cylindrical inspection rod coincides with the central axis of the pitch axis of the laser tracker.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] (1) The verticality error detection device of the pitch axis and azimuth axis of the laser tracker can detect the verticality of the pitch axis and azimuth axis of the laser tracker through a coaxial cylindrical inspection rod and a projection image measuring instrument. The measurement process is simple, contact-free, and has high measurement accuracy, which can meet the needs of high-precision detection of the intersection error of the laser tracker axis system.

[0020] (2) This detection method is suitable for the accuracy of axis verticality error detection of most two-dimensional turntables, and can meet the needs of two-dimensional turntable verticality detection in precision assembly and inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] For a more complete understanding of the present disclosure and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 A top view schematically shows a device for detecting verticality errors of the pitch axis and the azimuth axis of a laser tracker according to an embodiment of the present disclosure;

[0023] Figure 2 A left view schematically shows a verticality error detection device for the pitch axis and the azimuth axis of a laser tracker according to an embodiment of the present disclosure;

[0024] Figure 3A schematic diagram of a projection profile on a receiver according to an embodiment of the present disclosure is schematically shown;

[0025] Figure 4 A front view schematically shows a device for detecting verticality errors of the pitch axis and the azimuth axis of a laser tracker according to an embodiment of the present disclosure;

[0026] Figure 5 Schematically shows an embodiment of the present disclosure Figure 4 A magnified schematic diagram of the local area O in the figure. DETAILED DESCRIPTION

[0027] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0028] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0029] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0030] Figure 1 A top view of a device for detecting verticality errors of the pitch axis and the azimuth axis of a laser tracker according to an embodiment of the present disclosure is schematically shown.

[0031] like Figure 1As shown, the verticality error detection device of the pitch axis and azimuth axis of the laser tracker includes: a first cylindrical test rod 5, a second cylindrical test rod 6 and a projection image measuring instrument. The first cylindrical test rod 5 and the second cylindrical test rod 6 are respectively arranged on the pitch axis 2 on both sides of the laser tracker 7. The projection image measuring instrument includes a transmitter 10 and a receiver 11, wherein the first cylindrical test rod 5 is arranged between the transmitter 10 and the receiver 11, and is non-contactly arranged; the transmitter 10 is used to emit LED light to irradiate the first cylindrical test rod 5, and the receiver 11 is used to display the light and shadow formed after the LED light is partially blocked by the first cylindrical test rod 5 or the second cylindrical test rod 6, so as to obtain the central axis position of the first cylindrical test rod 5 and the second cylindrical test rod 6; according to the central axis position deviation of the first cylindrical test rod 5 and the second cylindrical test rod 6 and the detection end face distance, the verticality error of the pitch axis and azimuth axis of the laser tracker is obtained.

[0032] In the embodiment of the present disclosure, the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6 are relatively arranged on the pitch axis 2 on both sides of the laser tracker 7. Figure 1 As shown, the first cylindrical inspection rod 5 is arranged on the pitch axis 2 on the left side of the laser tracker 7, and the second cylindrical inspection rod 6 is arranged on the pitch axis 2 on the right side of the laser tracker 7. Figure 1 What is shown is only an exemplary description and does not constitute a limitation on the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6. For example, the second cylindrical inspection rod 6 can also be set on the pitch axis 2 on the left side of the laser tracker 7, and the first cylindrical inspection rod 5 is set on the pitch axis 2 on the right side of the laser tracker 7. It is set according to the position of the pitch axis 2 on the laser tracker 7. The embodiments of the present disclosure do not limit the positional relationship between the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6.

[0033] Specifically, the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6 are respectively connected to the end faces of the pitch axis 2 on both sides of the laser tracker 7 through adapters; wherein the adapter is used to adjust the orientation of the first cylindrical inspection rod 5 and / or the second cylindrical inspection rod 6. Figure 1 As shown, the first cylindrical rod 5 is connected to the end face 3 of the pitch axis 2 through the first adapter 8, and the second cylindrical rod 6 is connected to the end face 4 of the pitch axis 2 through the second adapter 9; vice versa. In the embodiment of the present disclosure, the diameters of the first cylindrical rod 5 and the second cylindrical rod 6 are preferably the same.

[0034] In the embodiment of the present disclosure, the orientation of the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6 can be adjusted by adjusting the displacement and angle of the first adapter 8 and / or the second adapter 9, so that the central axis of the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6 coincides with the central axis of the pitch axis 2 of the laser tracker 7.

[0035] like Figure 2 As shown, the verticality error detection device of the pitch axis and azimuth axis of the laser tracker further includes: a first support frame 12, which is used to fix and support the transmitter 10; and a second support frame 13, which is used to fix and support the receiver 11. In the embodiment of the present disclosure, the transmitter 10 and the receiver 11 of the projection image measuring instrument are fixed by the first support frame 12 and the second support frame 13, and the first support frame 12, the second support frame 13 and the laser tracker 7 are set on the same measuring platform, and the transmitter 10 and the receiver 11 are adjusted so that the optical axes are aligned, and the projection direction thereof is perpendicular to the pitch axis 2 of the laser tracker 7.

[0036] Specifically, the transmitter 10 emits LED light to illuminate the first cylindrical inspection rod 5. The remaining LED light after being partially blocked by the first cylindrical inspection rod 5 forms a shadow portion of the inspection rod on the receiver 11, as shown in FIG. Figure 3 As shown, the vertical reference line 14 on the receiver 11 is perpendicular to the horizontal reference line 15 and always keeps the same position. The central axis position 16 of the first cylindrical test rod is read by the receiver 11, wherein the central axis position 16 is displayed as a value A on the receiver 11. It should be noted that the LED light emitted by the transmitter 10 can be LED parallel light, etc.

[0037] In the embodiment of the present disclosure, by placing the first cylindrical inspection rod 5 between the transmitter 10 and the receiver 11 of the projection image measuring instrument, the position of the central axis of the first cylindrical inspection rod 5 can be detected according to the shadow outline of the first cylindrical inspection rod 5 on the receiver 11, thereby completing the contactless size measurement of the object to be measured.

[0038] Furthermore, in order to detect the position deviation of the central axis of the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6, the laser tracker 7 is rotated 180° around the azimuth axis 1, and the projection image measuring instrument detects the second cylindrical inspection rod 6 at the other end of the laser tracker 7, such as Figure 4 After the LED light is partially blocked by the second cylindrical probe 6, a shadow portion of the second cylindrical probe 6 is formed on the receiver 11. The central axis position 17 of the second cylindrical probe 6 can also be read on the receiver 11. The central axis position 17 is displayed as a value B on the receiver 11, as shown in FIG. Figure 5 During the detection process, the vertical reference line 14 and the horizontal reference line 15 on the receiver 11 remain unchanged.

[0039] According to the central axis position deviation of the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6 and the detection end face distance, the verticality error of the pitch axis and the azimuth axis of the laser tracker 7 is obtained, wherein the detection end face distance is the distance CD between the detection end face of the first cylindrical inspection rod 5 and the detection end face of the second cylindrical inspection rod 6. Therefore, it can be obtained that the verticality error of the pitch axis and the azimuth axis of the laser tracker and the detection end face distance CD specifically satisfy the following relationship:

[0040] θ=arctan(|AB| / CD)

[0041] Among them, θ represents the verticality error of the pitch axis and azimuth axis of the laser tracker, A represents the value corresponding to the central axis position of the first cylindrical inspection rod 5, B represents the value corresponding to the central axis position of the second cylindrical inspection rod 6, and CD represents the detection end face distance.

[0042] In the embodiments of the present disclosure, based on the actual assembly requirements of the laser tracker, a detection device based on a cylindrical inspection rod and a projection image measuring instrument is provided. The detection device has a simple measurement principle, non-contact measurement, easy operation and high precision. The axis position of the tracker's pitch axis can be easily extracted by using an online projection image measuring instrument, which can provide a simple and effective new detection method for the verticality detection of the pitch axis and azimuth axis of the laser tracker.

[0043] The embodiment of the present disclosure also provides a method for detecting verticality errors of the pitch axis and the azimuth axis of a laser tracker. Figure 1 The verticality error detection device for the pitch axis and azimuth axis of the laser tracker shown is implemented, specifically comprising: steps S101 to S104.

[0044] S101, the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6 in the verticality error detection device of the pitch axis and azimuth axis of the laser tracker are installed on the pitch axis on both sides of the laser tracker, and the first cylindrical inspection rod 5 is set between the transmitter 10 and the receiver 11. In the embodiment of the present disclosure, the azimuth of the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6 can be adjusted by adjusting the displacement and angle of the first adapter 8 and / or the second adapter 9, so that the central axis of the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6 coincides with the central axis of the pitch axis of the laser tracker.

[0045] S102, using the transmitter 10 to emit LED light to illuminate the first cylindrical inspection rod 5, so that the receiver 11 displays the light and shadow formed after the LED light is partially blocked by the first cylindrical inspection rod 5, and the central axis position of the first cylindrical inspection rod 5 is obtained. The central axis position of the first cylindrical inspection rod 5 is displayed as a value A on the receiver 11.

[0046] S103, rotate the laser tracker 7 180° around its azimuth axis so that the receiver 11 displays the light and shadow formed after the LED light is partially blocked by the second cylindrical inspection rod 6, and obtains the central axis position of the second cylindrical inspection rod 6. The central axis position of the second cylindrical inspection rod 6 is displayed as a value B on the receiver 11.

[0047] S104, obtaining the verticality errors of the pitch axis and the azimuth axis of the laser tracker according to the central axis position deviations of the first cylindrical inspection rod 5 and the second cylindrical inspection rod 6 and the detection end surface distance.

[0048] It should be noted that this method is based on Figure 1 The verticality error detection device for the pitch axis and azimuth axis of the laser tracker shown is implemented. The specific structure and detection principle of the verticality error detection device for the pitch axis and azimuth axis of the laser tracker are as shown in the above embodiment and will not be described in detail here.

[0049] Compared with the prior art, the present invention has at least the following beneficial effects:

[0050] (1) The verticality error detection device of the pitch axis and azimuth axis of the laser tracker can detect the verticality of the pitch axis and azimuth axis of the laser tracker through a coaxial cylindrical inspection rod and a projection image measuring instrument. The measurement process is simple, contact-free, and has high measurement accuracy, which can meet the needs of high-precision detection of the intersection error of the laser tracker axis system.

[0051] (2) This detection method is suitable for the accuracy of axis verticality error detection of most two-dimensional turntables, and can meet the needs of two-dimensional turntable verticality detection in precision assembly and inspection.

[0052] While the disclosure has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive.

[0053] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of scopes, even if such combinations or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of scopes without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0054] Although the present disclosure has been shown and described with reference to specific exemplary embodiments of the present disclosure, it should be understood by those skilled in the art that various changes in form and details may be made to the present disclosure without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above-mentioned embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A device for detecting verticality errors of the pitch axis and azimuth axis of a laser tracker, characterized in that: include: A first cylindrical inspection rod (5), a second cylindrical inspection rod (6) and a projection image measuring instrument; wherein: The first cylindrical inspection rod (5) and the second cylindrical inspection rod (6) are respectively arranged on the pitch axis on both sides of the laser tracker; The projection image measuring instrument comprises: a transmitter (10) and a receiver (11), wherein the first cylindrical inspection rod (5) is arranged between the transmitter (10) and the receiver (11); The transmitter (10) is used to emit LED light to illuminate the first cylindrical inspection rod (5), and the receiver (11) is used to display the light and shadow formed after the LED light is partially blocked by the first cylindrical inspection rod (5) or the second cylindrical inspection rod (6), so as to obtain the central axis position of the first cylindrical inspection rod (5) and the second cylindrical inspection rod (6); according to the central axis position deviation of the first cylindrical inspection rod (5) and the second cylindrical inspection rod (6) and the detection end face distance, the verticality error of the pitch axis and the azimuth axis of the laser tracker is obtained; the verticality error satisfies the following relationship: ) in, represents the verticality error of the pitch axis and the azimuth axis of the laser tracker; A represents the value corresponding to the central axis position of the first cylindrical inspection rod (5); B represents the value corresponding to the central axis position of the second cylindrical inspection rod (6); CD represents the detection end face distance.

2. The verticality error detection device of the pitch axis and azimuth axis of the laser tracker according to claim 1, characterized in that: The first cylindrical inspection rod (5) and the second cylindrical inspection rod (6) are respectively connected to the end faces of the pitch axis on both sides of the laser tracker via adapters; wherein the adapter is used to adjust the orientation of the first cylindrical inspection rod (5) and / or the second cylindrical inspection rod (6).

3. The verticality error detection device of the pitch axis and azimuth axis of the laser tracker according to claim 1, characterized in that: The detection end surface distance is the distance between the detection end surface of the first cylindrical detection rod (5) and the detection end surface of the second cylindrical detection rod (6).

4. The verticality error detection device for the pitch axis and azimuth axis of the laser tracker according to claim 1, characterized in that: The vertical reference line and the horizontal reference line of the receiver (11) remain unchanged during the detection process of the detection device.

5. The verticality error detection device for the pitch axis and azimuth axis of the laser tracker according to claim 1, characterized in that: The diameters of the first cylindrical inspection rod (5) and the second cylindrical inspection rod (6) are the same.

6. The verticality error detection device for the pitch axis and azimuth axis of the laser tracker according to claim 1, characterized in that: Also includes: A first support frame (12) used for fixedly supporting the transmitter (10); The second support frame (13) is used for fixedly supporting the receiver (11).

7. The device for detecting verticality errors of the pitch axis and the azimuth axis of a laser tracker according to claim 6, characterized in that: The LED light emitted by the transmitter (10) is perpendicular to the pitch axis of the laser tracker.

8. A method for detecting verticality errors of the pitch axis and azimuth axis of a laser tracker, characterized in that: include: The first cylindrical inspection rod (5) and the second cylindrical inspection rod (6) in the verticality error detection device for the pitch axis and the azimuth axis of the laser tracker according to any one of claims 1 to 7 are installed on the pitch axis on both sides of the laser tracker, and the first cylindrical inspection rod (5) is arranged between the transmitter (10) and the receiver (11); The transmitter (10) is used to emit LED light to illuminate the first cylindrical inspection rod (5), so that the receiver (11) displays the light and shadow formed after the LED light is partially blocked by the first cylindrical inspection rod (5), and the central axis position of the first cylindrical inspection rod (5) is obtained; Rotating the laser tracker 180° around its azimuth axis so that the receiver (11) displays the light and shadow formed after the LED light is partially blocked by the second cylindrical inspection rod (6), thereby obtaining the central axis position of the second cylindrical inspection rod (6); The verticality errors of the pitch axis and the azimuth axis of the laser tracker are obtained based on the central axis position deviations of the first cylindrical inspection rod (5) and the second cylindrical inspection rod (6) and the detection end surface distances.

9. The method for detecting verticality errors of the pitch axis and the azimuth axis of a laser tracker according to claim 8, characterized in that: The method further includes: The orientation of the first cylindrical inspection rod (5) and the second cylindrical inspection rod (6) is adjusted by adjusting the displacement and angle of the first adapter (8) and / or the second adapter (9), so that the central axis of the first cylindrical inspection rod (5) and the second cylindrical inspection rod (6) coincides with the central axis of the pitch axis of the laser tracker.

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