Anchor platform positioning method

Abstract

The invention relates to the technical field of ship manufacturing, and discloses an anchor platform positioning method which comprises the following steps: S1, establishing a three-dimensional model of a ship body comprising an anchor platform structure, and calculating an intersection line of each anchor platform datum plane and a ship body outer plate curved surface in the three-dimensional model of the ship body; s2, establishing a reference coordinate system according to the longitudinal reference, the transverse reference and the horizontal height reference of the hull segment entity; s3, based on the reference coordinate system, projecting the anchor chock coordinate data to the surface of the outer plate of the hull segment entity, and preliminarily marking the anchor chock data; s4, performing deviation comparison on the actually measured coordinates of the anchor station marks and the coordinate data of the anchor station; s5, based on the anchor station data mark, carrying out datum line snapping on the outer plate of the hull segment entity; s6, snapping a line along the datum line to knock an anvil mark on the outer plate of the hull segment entity to form anchor platform datum line positioning; and S7, positioning and pasting a trepanning sample plate based on the anchor platform datum line, and scribing a trepanning contour and a detection line. The construction efficiency of anchor platform positioning is remarkably improved, and the construction risk is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to a method for positioning an anchor platform. Background Art

[0002] In the field of shipbuilding, the installation accuracy of anchor platform components directly determines the reliability of the anchor chain retracting and releasing system and the navigation safety of the ship. In the existing technology, the positioning of the anchor platform mainly relies on manual lofting. The core steps of manual lofting include: sample paper making and pasting, baseline opening, sample paper transfer to the segment, sample paper knocking and sample punching, and reference line springing. Specifically, firstly, the sample paper is made in proportion based on the design drawings. The size of the sample paper is generally 6m×6m, and the reference line is manually drawn on the ground in the lofting room; then the sample paper is laid flat in the lofting room, aligned with the reference line and ground splicing calibration is performed; then 4 to 5 staff members paste the spliced ​​sample paper to the surface of the side segment, and form a permanent mark on the steel by knocking the sample punch; finally, the global positioning is completed using ink lines or powder lines.

[0003] However, during the manual layout process, the sample paper needs to go through multiple working procedures such as unfolding, splicing, and transfer. The dimensional deviation of the sample paper positioning accumulates step by step with the operation links, resulting in a decrease in positioning accuracy, increasing the installation rework rate of the sample paper positioning, and lengthening the operation cycle of manual layout. Not only is the construction efficiency low, but the long-term high-altitude operations of multiple people increase the safety hazards of construction. Summary of the invention

[0004] The technical problem to be solved by the present invention is that in the prior art, the positioning of the anchor platform mainly relies on manual layout. During the manual layout, the sample paper needs to go through multiple processes such as unfolding, splicing, and transfer. The dimensional deviation of the sample paper positioning accumulates step by step with the operation links, resulting in a decrease in positioning accuracy, increasing the installation rework rate of the sample paper positioning, and lengthening the operation cycle of manual layout. Not only is the construction efficiency low, but the long-term high-altitude operations of multiple people increase the safety hazards of construction.

[0005] In order to solve the above technical problems, the present invention provides a method for positioning an anchor platform, comprising the following steps:

[0006] S1, establish a three-dimensional model of the hull including the anchor platform structure, define the projection line of each bracket of the anchor platform structure on the hull outer plate as the anchor platform reference line, select three non-collinear points on each bracket, respectively establish the anchor platform reference plane where each bracket is located, calculate the intersection line of each anchor platform reference plane and the hull outer plate curved surface in the three-dimensional model of the hull, and the coordinates of each point on the intersection line are the anchor platform coordinate data;

[0007] S2, measuring the longitudinal datum, transverse datum and horizontal height datum of the hull segment entity where the target anchor is located, and establishing a reference coordinate system according to the longitudinal datum, transverse datum and horizontal height datum of the hull segment entity;

[0008] S3, based on the reference coordinate system, project the anchor station coordinate data onto the outer plate surface of the hull segment entity, and preliminarily mark the anchor station data;

[0009] S4, scanning the outer plate surface of the hull segment entity to establish a measured model of the outer plate surface of the hull segment entity, scanning the anchor data mark on the hull segment entity to obtain the measured coordinates of the anchor mark, importing the measured model of the outer plate surface of the hull segment entity into the three-dimensional model of the hull for deviation comparison, and comparing the measured coordinates of the anchor mark with the anchor coordinate data;

[0010] If the deviation between the measured model of the outer plate surface of the hull segment entity and the three-dimensional model of the hull is less than the first preset value, and the deviation between the measured coordinates of the anchor mark and the anchor coordinate data is less than the first preset value, step S5 is performed.

[0011] If the deviation between the measured model of the outer plate surface of the hull segment entity and the three-dimensional model of the hull is greater than or equal to a first preset value, and / or the deviation between the measured coordinates of the anchor mark and the anchor coordinate data is greater than or equal to a first preset value, then based on the deviation, the anchor data mark is corrected so that the deviation is less than the first preset value, and step S5 is performed after the anchor data mark is corrected;

[0012] S5, based on the anchor data mark, a reference line is drawn on the outer plate of the hull segment entity;

[0013] S6, along the reference line, strike the sample punch mark on the outer plate of the hull segment entity to form the anchor base reference line positioning;

[0014] S7, based on the anchor base reference line, locate and paste the hole template, and mark the hole outline and inspection line.

[0015] Preferably,

[0016] In S1, three non-collinear points are selected on each bracket, and the anchor base reference planes where each bracket is located are established respectively, including:

[0017] The anchor platform structure includes an anchor platform base plate and four groups of brackets, each group of brackets includes two brackets symmetrically distributed in the circumference of the anchor platform base plate, three non-collinear points are selected on the surface of one of the brackets in each group of brackets, and a three-dimensional section is generated on the surface of each group of brackets through the three non-collinear points, and each of the three-dimensional sections is the anchor platform reference plane where each bracket is located.

[0018] Preferably,

[0019] The longitudinal reference, transverse reference and horizontal height reference of the hull segment entity where the anchor platform entity is located in S2 include:

[0020] Measure the rib inspection line of the hull section entity where the anchor platform entity is located, and take the rib inspection line as the transverse reference; measure the longitudinal section line of the hull section entity where the anchor platform entity is located, and take the longitudinal section line as the longitudinal reference; measure the deck horizontal height of the hull section entity where the anchor platform entity is located, and take the deck horizontal height as the horizontal height reference.

[0021] Preferably,

[0022] The verticality of the longitudinal section line and the rib inspection line is checked by a total station to ensure that the verticality deviation between the longitudinal section line and the rib inspection line is less than a second preset value. The horizontal heights of multiple points on the deck are measured by the total station, and the average of the horizontal heights of each point is calculated, and the average is used as the horizontal height reference.

[0023] Preferably,

[0024] The longitudinal datum, transverse datum and horizontal height datum of the hull segment entity where the anchor platform entity is located are measured to establish a segment coordinate system, and the segment coordinate system is imported into the 3D model of the hull for positioning to be converted into a reference coordinate system.

[0025] Preferably,

[0026] In S3, based on the reference coordinate system, the anchor coordinate data is projected onto the outer plate of the hull segment entity, and the anchor data is preliminarily marked, including:

[0027] The anchor station coordinate data is input into the total station. One person operates the total station to project the anchor station coordinate data onto the outer plate of the hull section entity. Another person places a reflective target according to the projection on the outer plate of the hull section entity and adjusts the position of the target in real time until the deviation between the target position and the projection is less than a third preset value, and makes a preliminary mark on the outer plate of the hull section entity.

[0028] Preferably,

[0029] The step S4 of scanning the outer plate surface of the hull segment entity to establish a measured model of the outer plate surface of the hull segment entity, and scanning the anchor data mark on the hull segment entity to obtain the measured coordinates of the anchor mark includes:

[0030] The outer plate surface of the hull segment entity is scanned by a point cloud scanning device to generate a measured model of the outer plate surface of the hull segment entity, and the anchor platform data mark on the outer plate surface of the hull segment entity is scanned by a point cloud scanning device to generate the measured coordinates of the anchor platform mark.

[0031] Preferably,

[0032] The baseline elastic line in S5 includes:

[0033] Use ink fountain or chalk line box to draw lines.

[0034] Preferably,

[0035] The step S6 of striking the sample punch mark on the outer plate of the hull segment entity along the reference line includes:

[0036] Strike 6 sample points every 1 meter along each baseline.

[0037] Preferably,

[0038] In the above-mentioned S7, the hole template is positioned and pasted based on the anchor base reference line, and the hole contour and inspection line are marked, including:

[0039] Align the reference line of the anchor chain tube opening template with the reference line of the outer plate anchor platform. When the error is less than the fourth preset value, tap the sample punching point along the edge of the template to form the opening contour line;

[0040] Draw a test line parallel to the contour line on the outside of the opening. The test line is used to check the accuracy after cutting.

[0041] Compared with the prior art, the anchor positioning method according to the embodiment of the present invention has the following beneficial effects:

[0042] Through the linkage of 3D modeling and measured data, the positioning accuracy and construction efficiency have been significantly improved. First, the anchor base reference line is directly opened with the 3D model coordinate data, replacing the traditional manual sample paper lofting process, eliminating the accumulated errors in the sample paper unfolding, splicing, and transfer from the source. The intersection line between the anchor base reference plane and the hull outer plate plane is calculated using 3D software, which simplifies the adjustment process of the anchor base angle and position, and significantly improves the construction efficiency of anchor base positioning. Before the reference line is drawn, the dynamic comparison between the 3D model and the measured data is used to realize the closed-loop verification of the reference line accuracy, ensuring that the anchor base positioning is synchronized with the overall state of the hull segment. Compared with the existing technology, the size of the paper sample is greatly reduced from 6m×6m to 900mm×900mm, the number of operators is reduced from 4 to 5 to 1 to 2, and the operation time is reduced from 21 hours to 5 hours. It not only reduces the safety risk of high-altitude collaboration, but also reduces the sample punching mark error to within 3mm, forming a set of high-precision and low-risk anchor base positioning methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of a hull segment entity structure with an anchor structure according to an embodiment of the present invention;

[0044] Figure 2 is a schematic diagram of establishing a reference line of an anchor structure according to an embodiment of the present invention;

[0045] Figure 3 is a schematic diagram of establishing a reference line of an anchor structure according to an embodiment of the present invention;

[0046] Figure 4The diagram is a schematic structural diagram of an embodiment of the present invention, looking outward from the hull along the anchor chain tube. DETAILED DESCRIPTION

[0047] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0048] like Figure 1 As shown, a method for positioning an anchor platform according to a preferred embodiment of the present invention comprises the following steps:

[0049] S1. A three-dimensional model of a hull including an anchor platform structure is established based on Tribon M3 ship design software. The anchor platform structure includes an anchor platform bottom plate and four groups of brackets. Each group of brackets includes two brackets symmetrically distributed in pairs on the circumference of the anchor platform bottom plate. The projection line of each bracket of the anchor platform structure on the hull outer plate is defined as the anchor platform reference line. Three non-collinear points are selected on the surface of one of the brackets in each group of brackets, and twelve points are selected in total. Three non-collinear points are selected on the surface of one of the brackets in each group of brackets. A three-dimensional section is generated on the surface of each group of brackets through the three non-collinear points. Each of the three-dimensional sections is the anchor platform reference plane where each bracket is located. After each anchor platform reference plane is formed, the intersection line of each anchor platform reference plane and the hull outer plate curved surface in the three-dimensional model of the hull is calculated in Tribon M3 ship design software. The coordinates of each point on the intersection line are the anchor platform coordinate data.

[0050] S2, using a total station to measure the bow and stern of the longitudinal section line of the hull segment entity where the anchor platform entity is located, taking the longitudinal section line as the longitudinal reference, and measuring the tire plate rib inspection line of the hull segment entity where the anchor platform entity is located by the total station, checking the tire plate rib inspection line, and when the deviation is greater than or equal to a second preset value, timely re-measurement or correction is performed until it is confirmed that the verticality deviation between the longitudinal section line and the rib inspection line is less than the second preset value, taking the tire plate rib inspection line as a transverse reference, measuring the horizontal heights of multiple points on the deck by the total station, calculating the average of the horizontal heights of each point, taking the average as the horizontal height reference, establishing a segmented coordinate system of the hull segment entity by the transverse reference, the longitudinal reference and the horizontal height reference, and importing the segmented coordinate system into a three-dimensional model of the hull including the anchor platform structure established by Tribon M3 ship design software for positioning, so that the segmented coordinate system is converted into a reference coordinate system based on the three-dimensional model of the hull.

[0051] S3, based on the reference coordinate system, the anchor station coordinate data is input into the total station, one person operates the total station to project the anchor station coordinate data onto the outer plate of the hull segment entity, and another person places a reflective target according to the projection on the outer plate of the hull segment entity, and adjusts the position of the target in real time until the deviation between the target position and the projection is less than a third preset value, and makes a preliminary mark on the outer plate of the hull segment entity.

[0052] S4, performing point cloud scanning on the outer plate surface of the hull segment entity by a point cloud scanning device to generate a measured model of the outer plate surface of the hull segment entity, performing point cloud scanning on the anchor data mark on the outer plate surface of the hull segment entity by a point cloud scanning device to generate measured coordinates of the anchor mark, importing the measured model of the outer plate surface of the hull segment entity into the three-dimensional model of the hull for deviation comparison, and performing deviation comparison between the measured coordinates of the anchor mark and the anchor coordinate data;

[0053] If the deviation between the measured model of the outer plate surface of the hull segment entity and the three-dimensional model of the hull is less than the first preset value, and the deviation between the measured coordinates of the anchor mark and the anchor coordinate data is less than the first preset value, step S5 is performed;

[0054] If the deviation between the measured model of the outer plate surface of the hull section entity and the three-dimensional model of the hull is greater than or equal to the first preset value, and / or the deviation between the measured coordinates of the anchor mark and the anchor coordinate data is greater than or equal to the first preset value, determine the cause of the deviation. The causes of the deviation can be divided into two categories. The first category is caused by local plastic deformation of the outer plate of the hull section, and thermal correction or mechanical reset is performed on the deformed area; the second category is caused by errors in the manual marking system, and the corrected anchor data mark in the error area needs to be corrected on site so that the deviation is less than the first preset value. After correcting the anchor data mark, proceed to step S5.

[0055] S5, based on the anchor data mark, the baseline is marked on the outer plate of the hull segment entity, and the baseline is marked using an ink fountain or a chalk line box.

[0056] S6, because the coordinate data position of the anchor platform is larger than the outline of the anchor platform coaming, the anchor platform reference line needs to be punched after the line is marked, and the sample punching mark is knocked on the outer plate of the hull segment entity along the reference line. On each reference line, 6 sample punching points are knocked every 1m. In this way, when the anchor platform coaming area is painted in time, the reference line position can be found according to the sample punching points and the line can be re-marked.

[0057] S7, making a hole template of the size of the opening of the anchor chain tube outer plate, aligning the reference line of the anchor chain tube opening template with the reference line of the outer plate anchor platform, and when the error is less than a fourth preset value, striking the sample punching point along the edge of the template to form the opening contour line;

[0058] Draw a test line parallel to the contour line on the outside of the opening. The test line is used to check the accuracy after cutting.

[0059] Specifically, in S2, the second preset value is 3 arc minutes.

[0060] Specifically, in S3, the third preset value is 3 mm.

[0061] Specifically, in S4, the first preset value is 3 mm.

[0062] Specifically, in S7, the fourth preset value is 3 mm.

[0063] Specifically, in S7, the size of the anchor chain tube opening template is approximately 900mm×900mm.

[0064] Specifically, in S7, the line width of the inspection line is 100 mm.

[0065] Of course, in other embodiments, other ship design software may also be used for three-dimensional modeling, such as SmartMarine 3D, Jiandao Cloud, etc.

[0066] Of course, in other embodiments, laser rangefinders or the like may also be used to measure parameters such as the distance, height, angle, etc. of the ship.

[0067] In summary, the embodiment of the present invention provides a method for locating an anchor platform, which significantly improves the positioning accuracy and construction efficiency through the linkage of three-dimensional modeling and measured data. First, the anchor platform reference line is directly opened with the three-dimensional model coordinate data, replacing the traditional sample paper manual lofting process, and eliminating the cumulative errors of sample paper unfolding, splicing, transfer and other links from the source. The intersection line between the anchor platform reference plane and the hull outer plate plane is calculated by three-dimensional software, which simplifies the adjustment process of the anchor platform angle and position, and significantly improves the construction efficiency of anchor platform positioning. Before the reference line is drawn, the three-dimensional model and the measured data are dynamically compared to realize the closed-loop verification of the reference line accuracy, ensuring that the anchor platform positioning is synchronized with the overall state of the hull segment. Compared with the prior art, the size of the paper sample is greatly reduced from 6m×6m to 900mm×900mm, the number of operators is reduced from 4 to 5 to 1 to 2, and the operation time is reduced from 21 hours to 5 hours, which not only reduces the safety risk of high-altitude collaboration, but also reduces the sample punching mark error to within 3mm, forming a set of high-precision and low-risk anchor platform positioning method.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for positioning an anchor platform, characterized in that: The following steps are involved: S1, establish a three-dimensional model of the hull including the anchor platform structure, define the projection line of each bracket of the anchor platform structure on the hull outer plate as the anchor platform reference line, select three non-collinear points on each bracket, respectively establish the anchor platform reference plane where each bracket is located, calculate the intersection line of each anchor platform reference plane and the hull outer plate curved surface in the three-dimensional model of the hull, and the coordinates of each point on the intersection line are the anchor platform coordinate data; S2, measuring the longitudinal datum, transverse datum and horizontal height datum of the hull segment entity where the target anchor is located, and establishing a reference coordinate system according to the longitudinal datum, transverse datum and horizontal height datum of the hull segment entity; S3, based on the reference coordinate system, project the anchor station coordinate data onto the outer plate surface of the hull segment entity, and preliminarily mark the anchor station data; S4, scanning the outer plate surface of the hull segment entity to establish a measured model of the outer plate surface of the hull segment entity, scanning the anchor data mark on the hull segment entity to obtain the measured coordinates of the anchor mark, importing the measured model of the outer plate surface of the hull segment entity into the three-dimensional model of the hull for deviation comparison, and comparing the measured coordinates of the anchor mark with the anchor coordinate data; If the deviation between the measured model of the outer plate surface of the hull segment entity and the three-dimensional model of the hull is less than the first preset value, and the deviation between the measured coordinates of the anchor mark and the anchor coordinate data is less than the first preset value, step S5 is performed. If the deviation between the measured model of the outer plate surface of the hull segment entity and the three-dimensional model of the hull is greater than or equal to a first preset value, and / or the deviation between the measured coordinates of the anchor mark and the anchor coordinate data is greater than or equal to a first preset value, then based on the deviation, the anchor data mark is corrected so that the deviation is less than the first preset value, and step S5 is performed after the anchor data mark is corrected; S5, based on the anchor data mark, a reference line is drawn on the outer plate of the hull segment entity; S6, along the reference line, strike the sample punch mark on the outer plate of the hull segment entity to form the anchor base reference line positioning; S7, based on the anchor base reference line, locate and paste the hole template, and mark the hole outline and inspection line.

2. The method for positioning an anchor platform according to claim 1, characterized in that: In S1, three non-collinear points are selected on each bracket, and the anchor base reference planes where each bracket is located are established respectively, including: The anchor platform structure includes an anchor platform base plate and four groups of brackets, each group of brackets includes two brackets symmetrically distributed in the circumference of the anchor platform base plate, three non-collinear points are selected on the surface of one of the brackets in each group of brackets, and a three-dimensional section is generated on the surface of each group of brackets through the three non-collinear points, and each of the three-dimensional sections is the anchor platform reference plane where each bracket is located.

3. The method for positioning an anchor platform according to claim 1, characterized in that: The longitudinal reference, transverse reference and horizontal height reference of the hull segment entity where the anchor platform entity is located in S2 include: Measure the rib inspection line of the hull section entity where the anchor platform entity is located, and take the rib inspection line as the transverse reference; measure the longitudinal section line of the hull section entity where the anchor platform entity is located, and take the longitudinal section line as the longitudinal reference; measure the deck horizontal height of the hull section entity where the anchor platform entity is located, and take the deck horizontal height as the horizontal height reference.

4. The method for positioning an anchor platform according to claim 3, characterized in that: The verticality of the longitudinal section line and the rib inspection line is checked by a total station to ensure that the verticality deviation between the longitudinal section line and the rib inspection line is less than a second preset value. The horizontal heights of multiple points on the deck are measured by the total station, and the average of the horizontal heights of each point is calculated, and the average is used as the horizontal height reference.

5. The method for positioning an anchor platform according to claim 4, characterized in that: The longitudinal datum, transverse datum and horizontal height datum of the hull segment entity where the anchor platform entity is located are measured to establish a segment coordinate system, and the segment coordinate system is imported into the 3D model of the hull for positioning to be converted into a reference coordinate system.

6. The method for positioning an anchor platform according to claim 1, characterized in that: In S3, based on the reference coordinate system, the anchor coordinate data is projected onto the outer plate of the hull segment entity, and the anchor data is preliminarily marked, including: The anchor station coordinate data is input into the total station. One person operates the total station to project the anchor station coordinate data onto the outer plate of the hull section entity. Another person places a reflective target according to the projection on the outer plate of the hull section entity and adjusts the position of the target in real time until the deviation between the target position and the projection is less than a third preset value, and makes a preliminary mark on the outer plate of the hull section entity.

7. The method for positioning an anchor platform according to claim 1, characterized in that: The step S4 of scanning the outer plate surface of the hull segment entity to establish a measured model of the outer plate surface of the hull segment entity, and scanning the anchor data mark on the hull segment entity to obtain the measured coordinates of the anchor mark includes: The outer plate surface of the hull segment entity is scanned by a point cloud scanning device to generate a measured model of the outer plate surface of the hull segment entity, and the anchor platform data mark on the outer plate surface of the hull segment entity is scanned by a point cloud scanning device to generate the measured coordinates of the anchor platform mark.

8. The method for positioning an anchor platform according to claim 1, characterized in that: The baseline elastic line in S5 includes: Use ink fountain or chalk line box to draw lines.

9. The method for positioning an anchor platform according to claim 1, characterized in that: The step S6 of striking the sample punch mark on the outer plate of the hull segment entity along the reference line includes: Strike 6 sample points every 1 meter along each baseline.

10. The method for positioning an anchor platform according to claim 1, characterized in that: In the above-mentioned S7, the hole template is positioned and pasted based on the anchor base reference line, and the hole contour and inspection line are marked, including: Align the reference line of the anchor chain tube opening template with the reference line of the outer plate anchor platform. When the error is less than the fourth preset value, tap the sample punching point along the edge of the template to form the opening contour line; Draw a test line parallel to the contour line on the outside of the opening. The test line is used to check the accuracy after cutting.

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