Method for measuring internal coordinate point position during installation of sealed box body

Abstract

The invention relates to the field of mechanical manufacturing product installation, in particular to a method for measuring internal coordinate point positions during installation of a sealed box body. Comprising the following steps: S1, off-line measurement of a box body; s2, establishing a box body installation reference coordinate system; s3, fitting and calculating a theoretical three-dimensional coordinate of an off-line target point outside the box body in the installation reference coordinate system; s4, carrying out online posture adjustment and measurement on the box body; and S5, calculating and analyzing measured values of design points in the box body. According to the method, the accurate mapping relation between the off-line coordinate system and the installation reference coordinate system is established, the coordinates of the internal design point positions of the box body are strongly correlated with the coordinates of the external off-line target points, and finally, the three-dimensional coordinate actual measurement values of the internal design point positions under the unified installation reference system are accurately and inversely calculated through the external actual measurement values. Therefore, quantitative and verifiable accurate measurement results are output.

Description

Technical Field

[0001] This invention relates to the field of mechanical manufacturing product installation, specifically a method for measuring the internal coordinate points during the installation of a sealed enclosure. Background Technology

[0002] For sealed enclosures, critical internal components cannot be measured by opening the door due to cleanliness requirements. Existing measurement methods involve marking the installation positions corresponding to the internal design points on the exterior of the enclosure during offline manufacturing. During installation, an external measuring instrument checks if the external installation positions are correctly positioned, thus aligning the internal points. However, this method cannot directly determine whether the three-dimensional coordinates of the internal design points after installation meet the original design coordinates, and therefore cannot provide quantitative measurement results. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for measuring the internal coordinate points of a sealed enclosure during installation. This method can obtain the actual three-dimensional coordinate values ​​of the designed points inside the enclosure in the installation reference system, thereby achieving quantitative measurement results and more accurate installation positioning.

[0004] The technical solution adopted by this invention to solve its technical problem is a method for measuring the internal coordinate points during the installation of a sealed enclosure, comprising the following steps: S1: Offline measurement of the box body. Multiple offline target points are set on the outer surface of the rectangular box body. The laser tracker is used to measure the offline three-dimensional coordinates of the design points inside the box body to establish the offline coordinate system for box body measurement. At the same time, the offline three-dimensional coordinates of the center of the offline target point are measured, and the correspondence between the offline three-dimensional coordinates of the design points inside the box body and the offline three-dimensional coordinates of the center of the offline target point is obtained. S2: Establish a reference coordinate system for the installation of the enclosure. Set up multiple online target points at the installation site, use a laser tracker to measure the sphere center coordinates of each online target point, and establish the installation reference coordinate system through station transformation and unified grid adjustment technology. S3: Fit and calculate the theoretical three-dimensional coordinates of the offline target points outside the box in the installation reference coordinate system. Based on the theoretical three-dimensional coordinates of the design points inside the box given in the design in the installation reference coordinate system, and according to the correspondence between the offline three-dimensional coordinates of the internal design points and the offline three-dimensional coordinates of the center of the offline target point, the theoretical three-dimensional coordinates of the offline target points in the installation reference coordinate system are obtained synchronously through measurement software. S4: Online attitude adjustment and measurement of the box body. A laser tracker is set up at the installation site to adjust the attitude of the box body so that the deviation between the actual three-dimensional coordinates and the theoretical three-dimensional coordinates of the offline target points in the installation reference coordinate system is controlled within 0.15mm, and the measured values ​​of the three-dimensional coordinates of each offline target point in the installation reference coordinate system are obtained. S5: Calculation and analysis of the measured values ​​of the design points inside the enclosure. Based on the measured values ​​of the three-dimensional coordinates of each offline target point in the installation reference coordinate system, the measured values ​​of the three-dimensional coordinates of the design points inside the enclosure in the installation reference coordinate system are obtained by fitting the measurement software.

[0005] Furthermore, in step S1, the offline target point outside the box uses a 1.5-inch target mount, which can hold a laser target ball or a photogrammetric target ball.

[0006] Furthermore, in step S2, the online target points of the installation reference coordinate system are set on the ground and the wall, and are divided into two layers in the height direction, with the distance between two adjacent online target points being 2m-6m.

[0007] Furthermore, in steps S3 and S5, the measurement software is SpatialAnalyzer or PolyWorks.

[0008] Furthermore, in step S5, the deviation between the measured value of the three-dimensional coordinates of the design points inside the box in the installation reference coordinate system and the theoretical three-dimensional coordinates is not greater than 0.05mm. If it is greater than 0.05mm, the box posture is adjusted repeatedly.

[0009] The beneficial effects of this invention are: by establishing a precise mapping relationship between the offline coordinate system and the installation reference coordinate system, the coordinates of the design points inside the box are strongly correlated with the coordinates of the external offline target points. Finally, the three-dimensional coordinate measured values ​​of the internal design points under the unified installation reference system are accurately calculated from the external measured values, thereby outputting quantitative and verifiable accurate measurement results. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the housing of the present invention; Figure 2 This is a schematic diagram showing the placement of the enclosure in the installation reference coordinate system; Figure 3 This is a schematic diagram showing the theoretical three-dimensional coordinates of the offline target points in the installation reference coordinate system obtained by synchronous fitting of the measurement software. Figure 4 This is a schematic diagram showing the measured three-dimensional coordinates of the designed points inside the enclosure in the installation reference coordinate system, obtained by fitting the measurement software. Detailed Implementation

[0011] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0012] like Figures 1-4 As shown, the present invention provides a method for measuring the internal coordinate points of a sealed enclosure during installation, comprising the following steps: S1: Offline measurement of the box body. Multiple offline target points are set on the outer surface of the rectangular box body. The laser tracker is used to measure the offline three-dimensional coordinates of the design points inside the box body to establish the offline coordinate system for box body measurement. At the same time, the offline three-dimensional coordinates of the center of the offline target point are measured, and the correspondence between the offline three-dimensional coordinates of the design points inside the box body and the offline three-dimensional coordinates of the center of the offline target point is obtained. See Figure 1 12-16 offline target points are evenly set on the outer surface of the rectangular enclosure. These offline target points use 1.5-inch target mounts, which can hold laser target spheres or photogrammetric target spheres. A laser tracker is used to measure the surface coordinates of the designed points inside the enclosure (such as planes, lines, and center points), establishing an offline coordinate system consistent with the product design coordinate system. Under this offline coordinate system, the offline 3D coordinates of the designed points inside the enclosure are obtained. Simultaneously, the laser tracker is used to measure the offline 3D coordinates of the centers of all offline target points in the same offline coordinate system. Finally, a set of correspondence data between the offline 3D coordinates of the internal designed points and the offline 3D coordinates of the external offline target points is obtained under a unified offline coordinate system. With the enclosure in a controllable offline environment, a precise coordinate relationship is established between the designed points inside the enclosure and the accessible offline target points outside. By establishing a unified offline coordinate system, the designed points inside the enclosure are bound to the easily measurable offline target points outside the enclosure, laying a data foundation for later online installation by measuring external points to deduce internal points.

[0013] S2: Establish a reference coordinate system for the installation of the enclosure. Set up multiple online target points at the installation site, use a laser tracker to measure the sphere center coordinates of each online target point, and establish the installation reference coordinate system through station transformation and unified grid adjustment technology. See Figure 2At the final installation site of the enclosure, the installation reference coordinate system is determined according to the design drawings. Dozens to hundreds of online target points are set up in solid locations such as the ground and walls, divided into two layers in the height direction, such as one layer at the ground and one layer 1.8 meters above the ground, with a spacing of 2m-6m between adjacent online target points. Multiple observation stations are established using a laser tracker to measure the sphere center coordinates of each online target point. Then, through station transformation and USMN adjustment technology, all measured data are comprehensively optimized to accurately calculate the three-dimensional coordinate value of each online target point in the installation reference coordinate system, thereby establishing a high-precision, large-range enclosure installation reference coordinate system. The installation reference coordinate system is a unified reference system for all online measurement data. It overcomes the limitations of a single laser tracker station having a small measurement range and accuracy decreasing with distance, ensuring that the entire installation measurement process is carried out under a stable and unified coordinate standard, which is a prerequisite for achieving high-precision installation.

[0014] S3: Fit and calculate the theoretical three-dimensional coordinates of the offline target points outside the box in the installation reference coordinate system. Based on the theoretical three-dimensional coordinates of the design points inside the box given in the design in the installation reference coordinate system, and according to the correspondence between the offline three-dimensional coordinates of the internal design points and the offline three-dimensional coordinates of the center of the offline target point, the theoretical three-dimensional coordinates of the offline target points in the installation reference coordinate system are obtained synchronously through measurement software. See Figure 3 The design unit will provide the theoretical 3D coordinates of the internal design points of the enclosure in the final installation reference coordinate system. Using measurement software (such as SpatialAnalyzer or PolyWorks), based on the theoretical 3D coordinates of these internal design points, the offline 3D coordinates of the internal design points obtained in step S1 in the offline coordinate system are used as the fitting object for best fit calculation. The fitting deviation is usually controlled within 0.1mm. After the fitting is completed, the measurement software will simultaneously calculate a coordinate transformation relationship. Using this relationship, the coordinates of the external offline target points associated with the design points in step S1 are transformed and assigned to the theoretical 3D coordinates in the installation reference coordinate system. The offline measurement data is then associated with the online installation reference. Through software fitting, the coordinate transformation relationship of the enclosure from the offline state to the ideal installation state is found, thereby deriving the specific positions of the external offline target points in the installation reference coordinate system when the internal points of the enclosure are located in the theoretical installation position. These calculated coordinate values ​​are the theoretical target values ​​for subsequent adjustments to the enclosure's attitude.

[0015] S4: Online attitude adjustment and measurement of the box body. A laser tracker is set up at the installation site to adjust the attitude of the box body so that the deviation between the actual three-dimensional coordinates and the theoretical three-dimensional coordinates of the offline target points in the installation reference coordinate system is controlled within 0.15mm, and the measured values ​​of the three-dimensional coordinates of each offline target point in the installation reference coordinate system are obtained. A laser tracker is set up at the installation site and positioned within the installation reference coordinate system established in step S2 by measuring 5-8 online target points with known coordinates. The theoretical 3D coordinates of all external offline target points calculated in step S3 are input into the measurement software as a real-time comparison benchmark. Then, the position and attitude of the enclosure are adjusted, such as by using adjustable shims or rotating the enclosure, while the actual coordinates of the external offline target points are measured in real time using the laser tracker. The operator observes the deviation between the actual and theoretical coordinates until the deviation of all external offline target points is controlled within 0.15mm. At this point, the enclosure is locked, and the adjusted 3D coordinate values ​​of each offline target point are accurately measured and recorded. This step achieves precise positioning and attitude calibration of the enclosure. Using the theoretical coordinates of the external offline target points calculated in step S3 as the target, real-time measurement and adjustment ensure that the enclosure is actually placed in the position and attitude required by the design in physical space. By controlling the accuracy of the external offline target points, the installation accuracy of the internal design points is indirectly guaranteed.

[0016] S5: Calculation and analysis of the measured values ​​of the design points inside the enclosure. Based on the measured values ​​of the three-dimensional coordinates of each offline target point in the installation reference coordinate system, the measured values ​​of the three-dimensional coordinates of the design points inside the enclosure in the installation reference coordinate system are obtained by fitting the measurement software.

[0017] See Figure 4 After the enclosure's posture is fixed, in the measurement software, the measured 3D coordinates of the external offline target points obtained in step S4 are used as the reference point group. The offline 3D coordinates of the internal design points in the offline coordinate system obtained in step S1 and the offline 3D coordinates of the external offline target points are used as the fitting object group, and the best fit calculation is performed again. The deviation of this fitting should be controlled within 0.05mm. After successful fitting, the software will perform coordinate transformation on the coordinates of the internal design points in the fitting object group, and finally output the measured 3D coordinates of these internal design points in the installation reference coordinate system. The operator can compare this measured value with the design theoretical value. If the deviation exceeds the tolerance, step S4 needs to be repeated for fine adjustment. In this step, under the actual installation posture of the enclosure, the actual coordinates of those design points inside the enclosure that cannot be directly measured are calculated in reverse using the accurately measured coordinates of the external target points. This achieves non-contact accurate measurement of the internal design points, outputs quantitative and verifiable installation results, and thus completely solves the problem of not being able to obtain quantitative measurement data of the internal design points mentioned in the background technology.

[0018] Furthermore, in step S1, the offline target point outside the box uses a 1.5-inch target mount, which can hold a laser target ball or a photogrammetric target ball.

[0019] Furthermore, in step S2, the online target points of the installation reference coordinate system are set on the ground and the wall, and are divided into two layers in the height direction, with the distance between two adjacent online target points being 2m-6m.

[0020] Furthermore, in steps S3 and S5, the measurement software is SpatialAnalyzer or PolyWorks.

[0021] Furthermore, in step S5, the deviation between the measured value of the three-dimensional coordinates of the design points inside the box in the installation reference coordinate system and the theoretical three-dimensional coordinates is not greater than 0.05mm. If it is greater than 0.05mm, the box posture is adjusted repeatedly.

[0022] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for measuring the internal coordinate points during the installation of a sealed enclosure, characterized in that: It comprises the following steps, S1: box offline measurement, a plurality of offline target points are arranged on the outer side of the rectangular box, the offline three-dimensional coordinates of the design points inside the box are measured by using a laser tracker, an offline coordinate system of the box measurement is established, the offline three-dimensional coordinates of the ball centers of the offline target points are measured, and the corresponding relationship between the offline three-dimensional coordinates of the design points inside the box and the offline three-dimensional coordinates of the ball centers of the offline target points is obtained; S2: establishing a box installation reference coordinate system, a plurality of online target points are arranged on the installation site, the ball center coordinates of each online target point are measured by using a laser tracker, and the installation reference coordinate system is established through station conversion and unified grid adjustment technology; S3: fitting calculation of the theoretical three-dimensional coordinates of the offline target points outside the box in the installation reference coordinate system, taking the theoretical three-dimensional coordinates of the design points inside the box in the installation reference coordinate system as the reference, according to the corresponding relationship between the offline three-dimensional coordinates of the design points inside the box and the offline three-dimensional coordinates of the ball centers of the offline target points, the theoretical three-dimensional coordinates of the offline target points in the installation reference coordinate system are obtained by synchronous fitting through the measurement software; S4: box online posture adjustment and measurement, erecting a laser tracker at the installation site, adjusting the posture of the box so that the deviation between the actual three-dimensional coordinates and the theoretical three-dimensional coordinates of the offline target points in the installation reference coordinate system is controlled within 0.15mm, and the three-dimensional coordinate measured values of each offline target point in the installation reference coordinate system are obtained; S5: calculation and analysis of the measured values of the design points inside the box, taking the three-dimensional coordinate measured values of each offline target point in the installation reference coordinate system as the reference, the three-dimensional coordinate measured values of the design points inside the box in the installation reference coordinate system are obtained by fitting through the measurement software.

2. The method of claim 1, wherein the method further comprises: determining the position of the internal coordinate point of the sealed box when the sealed box is installed. In step S1, the offline target points outside the box use 1.5 inch target seats, which can place laser target balls or photogrammetry target balls.

3. The method of claim 1, wherein the method further comprises: determining the position of the internal coordinate point of the sealed box when the sealed box is installed. In step S2, the online target points of the installation reference coordinate system are arranged on the ground and the wall, and are divided into two layers in the height direction, the distance between adjacent two online target points is 2m-6m.

4. The method of claim 1, wherein the method further comprises: determining the position of the internal coordinate point of the sealed box when the sealed box is installed. In steps S3 and S5, the measurement software is SpatialAnalyzer software or PolyWorks software.

5. The method for measuring the internal coordinate points during the installation of a sealed enclosure as described in claim 1, characterized in that: In step S5, the deviation between the three-dimensional coordinate measured values and the theoretical three-dimensional coordinates of the design points inside the box in the installation reference coordinate system is not greater than 0.05mm, if it is greater than 0.05mm, the posture of the box is repeatedly adjusted.

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