CN115451811A - Measurement method for digital coordination of rocket pressurized conveying pipeline - Google Patents
Measurement method for digital coordination of rocket pressurized conveying pipeline Download PDFInfo
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- CN115451811A CN115451811A CN202210910805.4A CN202210910805A CN115451811A CN 115451811 A CN115451811 A CN 115451811A CN 202210910805 A CN202210910805 A CN 202210910805A CN 115451811 A CN115451811 A CN 115451811A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention provides a measurement method for digital coordination of a rocket pressurized conveying pipeline, which comprises the following steps: s1, measuring and taking points of a storage tank and an engine flange; s2, constructing a storage tank, the flange end face of the engine and the circle center of the flange; s3, classifying the pipe fittings; s4, establishing a pipe fitting measurement coordinate system; s5, measuring the pipe fittings; and S6, exporting measured data. The invention obtains the actual measurement data of the parts based on the product physical measurement, and can obtain higher coordination precision based on the simulation assembly of the physical measurement when the actual size of the parts and the drawing requirement have larger difference; the invention stipulates the general requirements and principles of tank and engine flange and pipe measurement, and provides an optimized measurement sampling method according to the structural characteristics of components on the premise of satisfying subsequent reconstruction and simulation assembly; in key measurement, the subsequent processing, clamping, alignment and lofting cutting of the pipe fitting are considered, a scheme for establishing coordinates and transmitting the coordinates is provided, and the method is simple and easy to operate.
Description
Technical Field
The invention relates to the field of measurement methods for digital coordination of rocket pressurized conveying pipelines, in particular to a measurement method for digital coordination of rocket pressurized conveying pipelines.
Background
The bottom flange of the rocket tank is connected with the engine flange through a pipeline (one pipeline is composed of 2-4 pipe fittings). Due to factors such as large-size storage tanks and engine welding assembly, and the like, and also the test and examination, the final state and the design drawing have larger size difference; the production of thin-walled pipe fittings is also difficult to guarantee high precision. The spatial position between the bottom flange of the storage tank and the engine flange, and the actual size and the theoretical size of the pipe fittings forming the pipeline have larger difference and poorer consistency, and the pipe fittings or the pipeline can not be produced in batches according to the standard size. In the simulation assembly based on the measured data, after the space pose of a tank bottom flange of a storage tank and an engine flange and pipe fittings forming a pipeline are measured in a real object mode, simulation assembly software is introduced, the field pose of the tank bottom flange of a rocket storage tank and the engine flange is used as a constraint condition, and the set pipe fitting simulation assembly requirement is met through rotation and translation of the pipe fittings.
The existing method is that the pipeline is in a field coordinated way to determine the final size and orientation. That is, when the pipeline parts (key) are produced, the two sections of pipe fittings are respectively connected with the storage tank flange and the engine end flange, and then the guide piece joint assembled on the storage tank flange and the engine end flange and the middle pipe fitting are repeatedly subjected to butt joint coordination, taking down and repair. Until the butt joint is completed, the traditional assembling method seriously depends on skilled personnel with rich experience, and has great subjectivity and uncertainty in coordination and long assembling time.
The invention is suitable for measuring the field poses of the rocket storage tank and the engine flange and the appearance of the pipe fitting to be coordinated by using measuring equipment such as a laser tracker, a laser scanning joint arm, a laser scanner and the like, obtaining three-dimensional data, outputting the three-dimensional data to simulation assembly software for reconstruction, and then being used for virtual coordination assembly of the pipe fitting based on the measured data.
Disclosure of Invention
The invention aims to provide a measuring method for digital coordination of a rocket pressurizing conveying pipeline, which can be used for field pose measurement of a carrier rocket storage tank and an engine and interface size measurement of pipe fittings. The measurement result can be output to simulation assembly software through a specific format file, and can be used for virtual coordination assembly of the pipe fitting and processing lofting of the pipe fitting based on measured data after three-dimensional reconstruction of third-party software.
In order to solve the technical problem, the technical scheme of the invention is as follows: a measurement method for digital coordination of a rocket pressurized conveying pipeline is provided, and comprises the following steps:
s1, measuring and taking points of a storage tank and an engine flange;
s2, constructing a storage tank, the flange end face of the engine and the circle center of the flange;
s3, classifying the pipe fittings;
s4, establishing a pipe fitting measurement coordinate system;
s5, measuring the pipe fitting;
and S6, exporting the measurement data.
Preferably, the step S1 includes:
taking points to measure the end surfaces and the circle centers of the storage tank and the engine flange, wherein more than 4 points are taken on the end surfaces or the circumferences during measurement, and the point taking positions are more than 1/2 of the end surfaces or the circumferences; when a laser tracker is used for measurement, a target ball is placed on the end face to obtain an end face point, and a columnar target base is used for obtaining a flange circumference point; when the measuring pen is used for measuring, a measuring head of the measuring pen is tightly attached to the end face to take an end face point, and the measuring head is tightly attached to the inner circle to take a flange circumference point.
Preferably, the step S2 includes:
and (2) offsetting the end surface point measured in the step (S1) to an actual contact surface to construct a flange end surface, projecting the measured point of the hole to the flange surface, and constructing a projection circle by using the projection point to obtain the center of the projection circle, namely the center of the flange.
Preferably, the step S3 includes:
dividing the pipe fitting into a flange end and a coordination end according to the composition form of the pipe fitting; the flange end is a connecting end and is restrained and positioned through the end face and the circle center during simulation assembly; the coordination terminal can be cut during simulation assembly;
according to the structural characteristics, the pipe fittings are divided into 3 types of flange-compensator-elbow pipe, flange-compensator and straight pipe.
Preferably, the step S4 includes:
before measurement, a clamping tool or a marker which can be used for establishing a space coordinate system is arranged on the outer wall of the pipe fitting, and the clamping tool or the cubic block needs to avoid measurement positions such as flanges, coordination ends and the like;
before the pipe fitting is measured, a three-dimensional space coordinate system is established on a clamping tool or a marker, and the subsequent measurement of the pipe fitting is carried out under the coordinate system; the clamping tool or other markers for establishing the coordinate system are also used for aligning the coordinates of the workpiece during subsequent machining lofting.
Preferably, the step S5 includes:
the flange end is characterized in an end face + inner circle mode: using a contact type measuring method to take points at the flange end to construct and obtain the flange end face; when a circle is measured, projecting a measuring point to the end face of the flange to obtain the circle center of the end face circle of the flange;
the coordination end of the flange-compensator-elbow pipe fitting is characterized by adopting an outer cylinder + outer cylinder mode: representing the outer cylinder of the coordination end by using point clouds, wherein the axial length of the point clouds from the end surface is 30-50 mm, and the number of single-section point clouds is controlled to be 5000-10000; taking another annular area which is about 20-40 mm away from the axial direction of the annular area at the coordination end, wherein the axial length of the point cloud is 20-40 mm, and the number of single-section point clouds is controlled to be 5000-10000;
the representation mode of the coordination end of the flange-compensator-straight pipe fitting is the same as that of the flange-compensator-bent pipe fitting, and no sampling can be performed at a position which is 20-40 mm away from the annular area of the coordination end in the axial direction; the coordination end of the flange-compensator pipe fitting is characterized by adopting a mode of 'end surface + excircle': the end face is formed by uniformly distributed 8-12 points; the circle is obtained by adopting an 8-12 point structure; both ends of the straight pipe fitting are coordination ends: the outer cylinders of the two coordination ends are represented by point clouds, the axial length of the point clouds is 30-50 mm, and the number of single-section point clouds is controlled to be 5000-10000.
Preferably, the step S6 includes:
the flange field pose and key measurement data are output in TXT or IGES format, and the file and measurement element naming is carried out according to the specified rule.
Preferably, the markers used for establishing the space coordinate system are solid blocks
The measurement method for the digital coordination of the rocket pressurized conveying pipeline provided by the invention has the following beneficial effects:
1) The invention obtains the actual measurement data of the parts based on the product physical measurement, and can obtain higher coordination precision based on the simulation assembly of the physical measurement when the actual size of the parts and the drawing requirement have larger difference;
2) The invention stipulates the general requirements and principles of the storage tank, the engine flange and the pipe fitting measurement, and provides an optimized measurement sampling method according to the structural characteristics of components on the premise of meeting the requirements of subsequent reconstruction and simulation assembly, thereby facilitating the operation and data processing;
3) In key measurement, the subsequent processing, clamping, alignment and lofting cutting of the pipe fitting are considered, a scheme for establishing coordinates and transmitting the coordinates is provided, and the method is simple and easy to operate.
Drawings
The invention is further described with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of the measurement of the field position and pose of a storage tank and an engine, and the position of an end face and the position of a circle center, wherein when the storage tank and the field position and pose of the engine are measured by using a laser tracker, a special tripod is erected on one side of the storage tank, the position of a laser head of the laser tracker is visible relative to each measurement element on the end face of the storage tank, a light path is not shielded, transfer stations are dispersedly arranged on one side of the engine, and a flange is spatially limited through the end face and the circle center after the measurement. Fig. 2 (a) is a schematic diagram of a flange end, a coordination end position and a measurement result of a pipe fitting in a form of a flange-compensator-elbow, fig. 2 (b) is a schematic diagram of a flange end, a coordination end position and a measurement result of a pipe fitting in a form of a flange-compensator, and fig. 2 (c) is a schematic diagram of a coordination end position and a measurement result of a pipe fitting in a form of a straight pipe.
Detailed Description
The following describes the measurement method for digital coordination of the rocket pressurized conveying pipeline according to the present invention in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are each provided with a non-precise ratio for the purpose of facilitating and clearly facilitating the description of the embodiments of the present invention.
Example 1
The embodiment provides a flange field pose and key measurement sampling method for digital assembly, which comprises the following steps of:
step one, measuring and taking points of a storage tank and an engine flange: when a tracker is used for measurement, a special tripod is erected on one side of a storage tank, a laser tracker is close to the edge of the storage tank and is 10-30 cm away from the end face of the storage tank, the position of a laser head of the laser tracker is basically equal to the axis of the storage tank, an engine stringer is not shielded from a light path, 4 transfer stations are arranged on the ground on one side of an engine and on the two sides of a distribution station 1 and a distribution station 2 of the laser tracker, two points on one side of the engine are required to be distributed near the axis of the tank body, one point is close to the edge of the engine, the distance between the two points is more than 2m, the distance between the two points is more than 2.5m from a support on the two sides of the distribution station 1 and the distribution station 2, and 4 transfer stations are all visible relative to the laser tracker. Measuring by using a target ball with the diameter of 1.5 inches (38.1 mm), placing the target ball on a plane when taking points from the flange surface, and clockwise measuring and taking 6 measuring points from the right lower part, wherein the measuring points are S-shaped and uniformly distributed; when a flange circle is used for taking a point, a target ball seat is arranged on a hole, a target ball central point is obtained through measurement, part of the flange without an butt hole uses a columnar measuring pin, the flange outer circle is measured to take the point, generally, 6 points are uniformly taken, and coordinate splicing is realized through one-time station transfer in the measurement.
Step two, the end face and circle center structure of the storage tank and the engine flange and the result output: and after the measuring points are completed, obtaining flange plane elements by adopting a plane offset structure, projecting the flange circle measuring points to a plane and constructing to obtain a flange circle and a circle center point. After the measurement and construction are finished, the measurement result is output and stored according to the IGES format and the notepad format.
Step three, measuring the pipe fittings: take a "flange-compensator-straight pipe" type pipe fitting as an example. And (3) measuring and sampling the pipe fitting by using the laser scanning joint arm, completing the opening and calibration of the equipment, and starting to measure.
Establishing a measurement coordinate: three faces of a cube fixed on a pipe are measured, or a face-line-point (or 3, 2, 1) is measured on a clamping tool, and a coordinate system is established.
Flange end measurement sampling: (1) selecting and creating a 'surface' feature, uniformly taking 8-12 points on the end face of the flange end in a contact detection mode, and completing the sampling of the 'surface' feature; (2) selecting and creating a circle characteristic, uniformly taking 8-12 points on the inner circle of the flange end in a contact detection mode, and projecting the measuring points to the end surface to obtain the center and the circumference of the projected circle when measuring the circle.
Measurement sampling at a coordination terminal: (1) reselecting and setting a measuring arm sensor, enabling a laser scanning measuring head of a measuring arm to be in a working state, starting a scanning function, setting a data type to be a discrete point, setting a scanning density to be in a low-density state, starting a coordination end to measure and sample by holding a laser scanning head by hand, and requiring that the sampling length is more than 70mm; (2) using a frame selection function, reserving a point cloud with the axial length of 30-50 mm from the end face of the coordination end and another annular point cloud area with the axial length of 20-40 mm from the coordination end and with the axial length of 20-40 mm from the coordination end, and deleting other point clouds except the two annular areas; (3) and (3) diluting the point cloud density, wherein the point cloud density is generally diluted to 5-10%, and the number of single-section annular point cloud points is controlled within 10000. And after the measurement sampling is finished, outputting an IGES format file to the measurement result in the form of a data point and storing the data point.
And fifthly, exporting the measured data. And inputting the field pose data of the flange into third-party simulation assembly software, reconstructing to obtain the space pose of the flange as a constraint condition for pipeline coordination assembly. And (2) introducing data of the pipe fittings to be coordinated (more than 2 pipe fittings) into the same simulation assembly software, reconstructing to obtain a pipe fitting flange end and a coordination end digital analog, connecting the 2 pipe fittings to be coordinated with the storage tank and the engine flange respectively, requiring the circle center and the end surface to be coincident, enabling the flange to rotate around the center, and obtaining the optimal solution of multi-section (two pipe fittings at two ends and a middle straight pipe or bent pipe) simulation assembly by setting constraint conditions.
Those not described in detail in this specification are within the skill of the art. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. A measurement method for digital coordination of a rocket pressurized conveying pipeline is characterized by comprising the following steps:
s1, measuring and taking points of a storage tank and an engine flange;
s2, constructing a storage tank, an end face of a flange of the engine and a circle center of the flange;
s3, classifying the pipe fittings;
s4, establishing a pipe fitting measurement coordinate system;
s5, measuring the pipe fittings;
and S6, exporting the measurement data.
2. A measurement method for the digital coordination of rocket pressurized conveying lines according to claim 1, characterized in that said step S1 comprises:
taking points to measure the end surfaces and the circle centers of the storage tank and the engine flange, wherein more than 4 points are taken on the end surfaces or the circumferences during measurement, and the point taking positions are more than 1/2 of the end surfaces or the circumferences; when a laser tracker is used for measurement, a target ball is placed on the end face to obtain an end face point, and a columnar target base is used for obtaining a flange circumference point; when the measuring pen is used for measuring, a measuring head of the measuring pen is tightly attached to the end face to take an end face point, and the measuring head is tightly attached to the inner circle to take a flange circumference point.
3. A measurement method for the digital coordination of rocket pressurized conveying lines according to claim 2, characterized in that said step S2 comprises:
and (3) the end surface point measured in the step (S1) is shifted to an actual contact surface to construct a flange end surface, the measured point of the hole is projected to the flange surface, and a projection circle is constructed by using the projection point to obtain the center of the projection circle, namely the center of the flange.
4. A measurement method for the digital coordination of rocket pressurized transport conduits according to claim 3, wherein said step S3 comprises:
dividing the pipe fitting into a flange end and a coordination end according to the composition form of the pipe fitting; the flange end is a connecting end and is restrained and positioned through the end face and the circle center during simulation assembly; the coordination terminal can be cut during simulation assembly;
according to the structural characteristics, the pipe fittings are divided into 3 types of flange-compensator-elbow pipe, flange-compensator and straight pipe.
5. A measurement method for the digital coordination of rocket pressurized conveying lines according to claim 4, characterized in that said step S4 comprises:
before measurement, a clamping tool or a marker which can be used for establishing a space coordinate system is arranged on the outer wall of the pipe fitting, and the clamping tool or the cubic block needs to avoid measurement positions such as flanges, coordination ends and the like;
before the pipe fitting is measured, a three-dimensional space coordinate system is established on a clamping tool or a marker, and the subsequent measurement of the pipe fitting is carried out under the coordinate system; the clamping tool or other markers for establishing the coordinate system are also used for aligning the coordinates of the workpiece during subsequent machining lofting.
6. A measurement method for the digital coordination of rocket pressurized conveying lines according to claim 5, characterized in that said step S5 comprises:
the flange end is characterized by adopting a mode of 'end face + inner circle': using a contact type measuring method to take points at the flange end to construct and obtain the flange end face; when a circle is measured, projecting a measuring point to the end face of the flange to obtain the circle center of the end face circle of the flange;
the coordination end of the flange-compensator-elbow pipe fitting is characterized by adopting an outer cylinder + outer cylinder mode: representing the outer cylinder of the coordination end by using point clouds, wherein the axial length of the point clouds from the end surface is 30-50 mm, and the number of single-section point clouds is controlled to be 5000-10000; taking another annular area about 20-40 mm away from the axial direction of the annular area at the coordination end, wherein the axial length of the point cloud is 20-40 mm, and the number of single-section point clouds is controlled to be 5000-10000;
the representation mode of the coordination end of the flange-compensator-straight pipe fitting is the same as that of the flange-compensator-bent pipe fitting, and no sampling can be performed at a position which is 20-40 mm away from the annular area of the coordination end in the axial direction; the coordination end of the flange-compensator pipe fitting is characterized by adopting a mode of 'end surface + excircle': the end face is formed by uniformly distributed 8-12 points; the circle is obtained by adopting an 8-12 point structure; both ends of the straight pipe fitting are coordination ends: the outer cylinders of the two coordination ends are represented by point clouds, the axial length of the point clouds is 30-50 mm, and the number of single-section point clouds is controlled to be 5000-10000.
7. A measurement method for the digital coordination of rocket pressurized conveying lines according to claim 6, characterized in that said step S6 comprises:
the flange field pose and key measurement data are output in TXT or IGES format, and the file and measurement element naming is carried out according to the specified rule.
8. A measurement method for the digital coordination of rocket pressurized transport pipelines according to claim 5, characterized in that said markers that can be used to establish a spatial coordinate system are solid blocks.
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| CN202210910805.4A CN115451811A (en) | 2022-07-29 | 2022-07-29 | Measurement method for digital coordination of rocket pressurized conveying pipeline |
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| CN202210910805.4A CN115451811A (en) | 2022-07-29 | 2022-07-29 | Measurement method for digital coordination of rocket pressurized conveying pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116817746A (en) * | 2023-06-14 | 2023-09-29 | 蓝箭航天空间科技股份有限公司 | Pipeline measurement method of spaceflight carrier |
| CN117972945A (en) * | 2024-04-02 | 2024-05-03 | 成都飞机工业（集团）有限责任公司 | Digital evaluation method for spatial coordination relation of holes between large parts |
-
2022
- 2022-07-29 CN CN202210910805.4A patent/CN115451811A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116817746A (en) * | 2023-06-14 | 2023-09-29 | 蓝箭航天空间科技股份有限公司 | Pipeline measurement method of spaceflight carrier |
| CN117972945A (en) * | 2024-04-02 | 2024-05-03 | 成都飞机工业（集团）有限责任公司 | Digital evaluation method for spatial coordination relation of holes between large parts |
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