A 3D virtual assembly measurement method for large filters

Abstract

The present invention proposes a three-dimensional virtual assembly measurement method for a large filter in the field of filters. First, measure the large filter, establish a coordinate system for backup, and this file will be used as a template for data import to dock the data models of the support ring and the pressure vessel. Secondly, measure the support ring and establish a coordinate system for backup for model data export. Thirdly, measure the pressure vessel, establish a coordinate system, and at the same time, according to the thickness b of the support ring, through coordinate transformation, translate the coordinate system along the Z-axis by a distance of b for model data export. Finally, export the data models through the SA software: calculate the clearance values between the two side faces and the main face of the large filter and the pressure vessel and between the support ring and the keyway of the pressure vessel respectively, and determine whether the machining errors of the large filter and the support ring meet the process requirements. The present invention calculates the three-dimensional model assembly error through data export and import and determines the assembly error. It is suitable to be used as a three-dimensional virtual assembly measurement method for filters.

Description

Technical Field

[0001] The present invention relates to the assembly in the field of filters, and particularly to a three-dimensional virtual assembly measurement method for large filters. Background Art

[0002] At present, for the installation of large filters, the actual deviation cannot be obtained through traditional measurement methods. Only after hoisting and assembling can it be determined whether the gap is qualified. If it is unqualified, it is necessary to repeatedly lift and adjust until the gap error is qualified. Moreover, repeated assembly is very troublesome. Due to the excessive weight of large filters, the error changes once during each assembly, posing a safety risk. Summary of the Invention

[0003] In order to avoid repeated assembly of filters and solve the safety risk problems brought by the installation of large filters, the present invention provides a three-dimensional virtual assembly measurement method for large filters. This method uses a laser tracker and its supporting intelligent probe T-Probe for measurement to achieve the determination of assembly errors and solve the technical problems of filter assembly.

[0004] The technical solution adopted by the present invention to solve the technical problems is as follows:

[0005] A three-dimensional virtual assembly measurement method for large filters includes the following steps:

[0006] First, according to the structural characteristics of the large filter and the installation position of the laser tracker, measure points are arranged: The arrangement method is 8 lines in the circumferential direction inside the cylinder body, with 5 to 8 points axially distributed on each line, so a total of 40 to 64 points are measured to fit the cylinder of the cylinder body and the axis of this cylinder; on both sides and the main surface of the key grooves of the large filter at 0°, 90°, 180°, and 270°, 20 points and 40 points are evenly distributed respectively to fit the two side surfaces, the main surface of the key groove, and the plane normal; at the same time, the plane under the flange of the large filter is measured, and about 24 points are evenly distributed to fit the plane under the flange of the large filter and the plane normal; by establishing the intersection point of the cylinder axis and the plane under the flange of the large filter as the origin of the coordinate system, the cylinder axis as the Z axis of the coordinate system, and the normal direction of the main surface of the 0° large filter key groove as the X-axis direction, a coordinate system is established for backup, which is used for importing model data. This file will be used as a template for data import to dock with the data models of the support ring and the pressure vessel.

[0007] Second, the support ring is a circular ring structure, and the measurement method is the same as that of the large filter. Measure the outer cylindrical surface, both side surfaces and the main surface of the key grooves of the support ring at 0°, 90°, 180°, and 270°, and the upper flange surface of the support ring of this component; by establishing the intersection point of the axis of the outer cylinder and the bottom surface of the support ring as the origin of the coordinate system, the axis of the outer cylinder as the Z axis of the coordinate system, and the normal direction of the main surface of the 0° support ring key groove as the X-axis direction, a coordinate system is established for backup, which is used for exporting model data.

[0008] Next, measure the pressure vessel and arrange the measurement points. The arrangement method is 8 lines in the circumferential direction inside the cylinder body, and 5 to 8 points are axially distributed on each line. A total of 40 to 64 points are measured to fit the cylinder of the cylinder body and the axis of the cylinder. On both sides and the bottom surface of the four pressure vessel key grooves at 0°, 90°, 180°, and 270°, 20 points and 40 points are evenly distributed respectively to fit the two side surfaces, the main surface, and the plane normal of the pressure vessel key groove. At the same time, measure the plane of the reference surface of the pressure vessel, and about 24 points are evenly distributed for the number of measurement points to fit the plane of the reference surface of the pressure vessel and the plane normal. By establishing the intersection point of the cylinder axis and the plane of the pressure vessel reference surface as the origin of the coordinate system, the cylinder axis as the Z-axis of the coordinate system, and the normal direction of the main surface of the 0° pressure vessel key groove as the X-axis direction, a coordinate system is established. At the same time, according to the thickness b of the support ring, through coordinate transformation, the coordinate system is translated along the Z-axis by a distance of b, and this coordinate system is used as the final coordinate system.

[0009] Finally, export through the data model of the SA software: Under the same coordinate system, export the measurement data of the support ring and the pressure vessel according to the point group and the model respectively, and save them with fixed names for convenient subsequent data import. Relying on the data import template of the large filter measurement data, import the exported data packets into the template respectively, calculate the clearance values between the large filter and the pressure vessel key groove, and between the support ring and the two side surfaces and the main surface of the pressure vessel key groove respectively, and determine whether the machining errors of the large filter and the support ring meet the process requirements.

[0010] Positive effects: Since the present invention measures the three-dimensional dimensions of the large filter assembly and the internal components of the pressure vessel by applying the Leica AT960 laser tracker and its supporting intelligent probe T-Probe, and calculates the assembly error of the three-dimensional model through the data export and import functions of the SA software, the determination of the assembly error of the large filter is realized. It is suitable to be used as a three-dimensional virtual assembly measurement method for large filters. Description of the Drawings

[0011] Figure 1 It is a structural diagram of a large filter;

[0012] Figure 2 It is a structural diagram of the support ring;

[0013] Figure 3 It is a structural diagram of the pressure vessel;

[0014] Figure 4 It is a three-dimensional virtual assembly drawing.

[0015] In the figure, 1. upper flange surface of the large filter, 2. keyway of the large filter, 3. lower flange surface of the large filter, 4. inner cylinder surface of the large filter, 5. four-quadrant scale line of the large filter, 6. upper flange surface of the support ring, 7. inner circular ring surface of the support ring, 8. four-quadrant scale line of the support ring, 9. keyway of the support ring, 10. four-quadrant scale line of the pressure vessel, 11. reference surface of the pressure vessel, 12. inner cylindrical surface for pressure vessel assembly, 13. keyway of the pressure vessel. Detailed implementation manners

[0016] To make the objectives, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0017] In Figure 1 , the overall structure of the large filter is mainly composed of units such as the upper flange surface 1 of the large filter, the keyway 2 of the large filter, the lower flange surface 3 of the large filter, the inner cylinder surface 4 of the large filter, and the four-quadrant scale line 5 of the large filter.

[0018] During measurement, the laser tracker is set up at a distance of more than 2 m and less than 5 m from the large filter. The intelligent probe T-Probe is used to separately complete the measurement of the plane of the upper flange surface 1 of the large filter, three planes of the keyway 2 of the large filter, the plane of the lower flange surface 3 of the large filter, and the cylinder of the inner cylinder surface 4 of the large filter. Among them, there are a total of four groups of planes for the keyway 2 of the large filter, with three planes for each quadrant keyway, and a total of 14 groups of measurement points are measured; the plane of the upper flange surface 1 of the large filter, three planes of the keyway 2 of the large filter, the plane of the lower flange surface 3 of the large filter, and the cylinder of the inner cylinder surface 4 of the large filter are respectively fitted. Among them, there are a total of 12 planes for the keyway 2 of the large filter.

[0019] Taking the normal direction of the fitted lower flange surface 3 of the large filter as the positive direction of the Z-axis of the coordinate system, taking the intersection point of the fitted lower flange surface 3 of the large filter and the axis of the cylinder fitted with the inner cylinder surface 4 of the large filter as the origin of the coordinate system, and taking the normal direction of the main surface of the keyway 2 of the large filter as the direction pointed by the X-axis, a coordinate system 1 is established;

[0020] Taking the normal direction of the upper flange surface 1 of the fitted large filter as the positive direction of the Z-axis of the coordinate system, and taking the intersection point of the cylindrical axis fitted by the upper flange surface 1 of the large filter and the inner cylinder surface 4 of the large filter as the origin of the coordinate system, and taking the normal direction of the main surface of the 0° keyway 2 of the large filter as the X-axis direction, establish the coordinate system 2;

[0021] Save the file, and the stored name is the data import reference file.

[0022] In Figure 2 the overall structure of the support ring mainly includes the upper flange surface 6 of the support ring, the inner circular ring surface 7 of the support ring, the four-quadrant scale 8 of the support ring, and the keyway 9 of the support ring.

[0023] During measurement, pad up the support ring with a square pier about 500 mm, at a distance of more than 2 m and less than 5 m from the laser tracker. Use the intelligent probe T-Probe to complete the measurement of the upper flange surface 6 plane of the support ring, the inner circular ring surface 7 cylinder of the support ring, and the three planes of the keyway 9 of the support ring respectively. Among them, there are four groups of planes for the keyway 9 of the support ring, three planes for each quadrant keyway, and single-point measurement of the lower flange surface of the support ring, and a total of 15 groups of measurement points are measured; respectively fit the upper flange surface 6 plane of the support ring, the inner circular ring surface 7 cylinder of the support ring, and the three planes of the keyway 9 of the support ring. Among them, there are 12 planes for the keyway 9 of the support ring.

[0024] Taking the normal direction of the upper flange surface 6 of the fitted support ring as the positive direction of the Z-axis of the coordinate system, and taking the intersection point of the upper flange surface 6 of the fitted support ring and the cylindrical axis of the inner circular ring surface 7 of the support ring as the origin of the coordinate system, and taking the normal direction of the main surface of the 0° keyway 9 of the support ring as the X-axis direction, establish the coordinate system 3; check the Z value of the single-point three-dimensional coordinate of the lower flange surface of the support ring. Through coordinate transformation, translate the Z value in the coordinate system 3 to obtain a new coordinate system 3 and activate it. Export the measurement data of the support ring to a TXT format file with signed marked points, and save the file name as the coordinate system (3 to 2) marked points, and the file is reserved for later use. This coordinate system 3 corresponds to Figure 1 the coordinate system 2 established in

[0025] In Figure 3 the overall structure of the pressure vessel mainly consists of the four-quadrant scale 10 of the pressure vessel, the reference surface 11 of the pressure vessel, the inner cylindrical surface 12 for assembly of the pressure vessel, and the keyway 13 of the pressure vessel.

[0026] The pressure vessel is generally placed in a pit below the ground. During measurement, the laser tracker is set up more than 2 m and less than 5 m away from the pressure vessel. The intelligent probe T-Probe is used to complete the measurement of three planes of the reference plane 11 of the pressure vessel, the inner cylindrical surface 12 of the pressure vessel assembly, and the keyway 13 of the pressure vessel. Among them, there are four groups of planes for the keyway 13 of the pressure vessel, with three planes for each quadrant keyway, and a total of 14 groups of measurement points are measured; the three planes of the reference plane 11 of the pressure vessel, the inner cylindrical surface 12 of the pressure vessel assembly, and the keyway 13 of the pressure vessel are respectively fitted. Among them, there are 12 planes for the keyway 13 of the pressure vessel.

[0027] Taking the normal direction of the fitted reference plane 11 of the pressure vessel as the positive direction of the Z-axis of the coordinate system, taking the intersection point of the fitted reference plane 11 of the pressure vessel and the axis of the inner cylindrical surface 12 of the pressure vessel assembly as the origin of the coordinate system, and the normal direction of the main plane of the keyway 13 of the pressure vessel at 0° as the direction pointed by the X-axis, a coordinate system 4 is established; the coordinate system 4 is activated, and the measurement data of the pressure vessel is exported to a TXT format file with signed marked points, and the file name is saved as the marked points of the coordinate system (4 to 1), and the file is reserved for future use. This coordinate system 4 corresponds to Figure 1 the coordinate system 1 established in

[0028] Finally, the saved and reserved data is imported and the reference file is opened, the coordinate system 1 is activated, and the file - the marked points of the coordinate system (4 to 1) are imported through the SA software; the coordinate system 2 is activated, and then the file - the marked points of the coordinate system (3 to 2) are imported through the SA software; at this time, a three-dimensional virtual assembly result can be obtained. In the SA software, the clearance values between the large filter and the keyway of the pressure vessel and between the support ring and the two side faces and the main face of the keyway of the pressure vessel are respectively calculated, and whether the process tolerance requirements are met is judged according to the maximum and minimum values of the clearance values to guide the grinding of the positioning key.

[0029] In this embodiment, during the data import process, the three measurement results have been integrated into one file. Through the SA measurement software, the deviation of the keyway surface can be directly calculated to judge whether the design requirements are met, avoiding repeated physical assembly to find a qualified position; avoiding the troubles caused by repeated assembly, excessive weight, and the change of assembly error each time.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-dimensional virtual assembly measurement method for a large filter, characterized in that: It includes the following steps: Step 1, according to the structural characteristics of the large filter and the erection position of the laser tracker, arrange the measurement points: The arrangement method is 8 lines in the circumferential direction inside the cylinder body, and 5 to 8 points are axially distributed on each line, so a total of 40 to 64 points are measured, which are used to fit the cylinder of the cylinder body and the axis of the cylinder; On both sides and the main surface of the key grooves (2) of the large filter at 0°, 90°, 180°, and 270°, 20 points and 40 points are evenly distributed respectively, which are used to fit the two side surfaces, the main surface and the plane normal of the key grooves; At the same time, measure the plane of the lower surface (3) of the large filter flange, and 24 points are evenly distributed for the number of measurement points, which are used to fit the plane of the lower surface (3) of the large filter flange and the plane normal; By establishing the intersection point of the cylinder axis and the plane of the lower surface (3) of the large filter flange as the origin of the coordinate system, the cylinder axis as the Z axis of the coordinate system, and the main surface normal of the key groove (2) of the large filter at 0° as the X-axis direction, establish a coordinate system for standby, which is used for model data import. The data import reference file will be used as the template for data import to dock the support ring and the pressure vessel data model; Step 2, the support ring is a ring structure, and the measurement method is the same as that of the large filter. Measure the outer cylindrical surface, both sides and the main surface of the key grooves (9) of the support ring at 0°, 90°, 180°, and 270°, and the upper flange surface (6) of the support ring; By establishing the intersection point of the outer cylindrical axis and the bottom surface of the support ring as the origin of the coordinate system, the outer cylindrical axis as the Z axis of the coordinate system, and the main surface normal of the key groove (9) of the support ring at 0° as the X-axis direction, establish a coordinate system for standby, which is used for model data export; Step 3, measure the pressure vessel and arrange the measurement points; The arrangement method is 8 lines in the circumferential direction inside the cylinder body, and 5 to 8 points are axially distributed on each line, so a total of 40 to 64 points are measured, which are used to fit the cylinder of the cylinder body and the axis of the cylinder; On both sides and the main surface of the key grooves (13) of the pressure vessel at 0°, 90°, 180°, and 270°, 20 points and 40 points are evenly distributed respectively, which are used to fit the two side surfaces, the main surface and the plane normal of the key grooves (13) of the pressure vessel; At the same time, measure the plane of the reference surface (11) of the pressure vessel, and 24 points are evenly distributed for the number of measurement points, which are used to fit the plane of the reference surface (11) of the pressure vessel and the plane normal; By establishing the intersection point of the cylinder axis and the plane of the reference surface (11) of the pressure vessel as the origin of the coordinate system, the cylinder axis as the Z axis of the coordinate system, and the main surface normal of the key groove (13) of the pressure vessel at 0° as the X-axis direction, establish a coordinate system. At the same time, according to the thickness b of the support ring, through coordinate transformation, translate the coordinate system along the Z axis by a distance of b, and this coordinate system is used as the final coordinate system; Step 4, data model export via SA software: Under the same coordinate system, export the measurement data of the support ring and the pressure vessel by point group and model respectively, and save them with fixed names for convenient subsequent data import; relying on the data import template of the large filter measurement data, import the exported data packets into the template respectively, and calculate the clearance values between the two side surfaces and the bottom surface of the keyways of the large filter and the support ring and the outer body of the pressure vessel respectively, and determine whether the machining errors of the large filter and the support ring meet the process requirements.

2. A three-dimensional virtual assembly measurement method for a large filter according to claim 1, characterized in that: In step 1, during measurement, the laser tracker is set up more than 2 m and less than 5 m away from the large filter. Use the intelligent probe T-Probe to complete the measurement of the upper flange surface (1) plane of the large filter, the three planes of the large filter keyway (2), the lower flange surface (3) plane of the large filter, and the cylindrical surface of the inner cylinder body (4) of the large filter. Among them, there are a total of four groups of planes for the large filter keyway (2), three planes for each quadrant keyway, and a total of 14 groups of measurement points are measured; fit the upper flange surface (1) plane of the large filter, the three planes of the large filter keyway (2), the lower flange surface (3) plane of the large filter, and the cylindrical surface of the inner cylinder body (4) of the large filter respectively. Among them, there are a total of 12 planes for the large filter keyway (2).

3. A three-dimensional virtual assembly measurement method for a large filter according to claim 1, characterized in that: In step 2, the support ring is padded up by 500 mm with a square pier and set up more than 2 m and less than 5 m away from the laser tracker. Use the intelligent probe T-Probe to complete the measurement of the upper flange surface (6) plane of the support ring, the cylindrical surface of the inner circular ring surface (7) of the support ring, and the three planes of the support ring keyway (9). Among them, there are a total of four groups of planes for the support ring keyway (9), three planes for each quadrant keyway, and single-point measurement of the lower flange surface of the support ring, and a total of 15 groups of measurement points are measured; fit the upper flange surface (6) plane of the support ring, the cylindrical surface of the inner circular ring surface (7) of the support ring, and the three planes of the support ring keyway (9) respectively. Among them, there are a total of 12 planes for the support ring keyway (9).

4. A three-dimensional virtual assembly measurement method for a large filter according to claim 1, characterized in that: In step 3, during measurement, the laser tracker is set up more than 2 m and less than 5 m away from the pressure vessel. Use the intelligent probe T-Probe to complete the measurement of the reference plane (11) plane of the pressure vessel, the cylindrical surface of the inner assembly cylinder surface (12) of the pressure vessel, and the three planes of the pressure vessel keyway (13). Among them, there are a total of four groups of planes for the pressure vessel keyway (13), three planes for each quadrant keyway, and a total of 14 groups of measurement points are measured; fit the reference plane (11) plane of the pressure vessel, the cylindrical surface of the inner assembly cylinder surface (12) of the pressure vessel, and the three planes of the pressure vessel keyway (13) respectively. Among them, there are a total of 12 planes for the pressure vessel keyway (13).

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