A stern tube intersection line drawing method and stern tube

Abstract

The application relates to a stern shaft tube intersecting line drawing method and a stern shaft tube, and the method comprises the following steps: determining a neutral layer of the stern shaft tube, arranging a plurality of mark lines around the neutral layer at intervals, and drawing a side view of the neutral layer on CAD software; then drawing an unfolded plan view of the neutral layer above or below the side view of the neutral layer; extracting corresponding longitudinal lines of a ship outer plate from a CAD type line drawing of the ship outer plate, and copying the longitudinal lines into the side view of the neutral layer; then taking the intersection points of the longitudinal lines and the corresponding mark lines as starting points, and drawing first projection lines to the unfolded plan view of the neutral layer; connecting the intersection points of the first projection lines and the corresponding mark lines in the unfolded plan view of the neutral layer to form an intersecting line unfolded line of a first end of the stern shaft tube; and drawing the intersecting line unfolded line of the first end of the stern shaft tube by using a two-dimensional drawing of the longitudinal lines of the ship outer plate, so that the stern shaft tube can be processed in parallel with other components.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a method for drawing the intersection line of a stern tube and a stern tube. Background Technology

[0002] A stern tube is a sleeve-shaped shaft section located at the stern of a ship, used to enclose the propeller shaft and allow it to pass through to the outside of the hull. In twin-propeller or multi-propeller ships, the stern tubes extend to the outside of the hull on both sides and are welded to the hull plating. For example... Figure 1 , Figure 2 As shown, the stern tube mounting holes 100 are arranged at an angle forward and backward, and the ship's outer plate 200 is curved. The intersection line between the stern tube and the ship's outer plate 200 has a complex shape. Currently, shipyards mostly use seamless steel pipes as stern tubes. The ends of the seamless steel pipes need to be reserved with a large amount of allowance. When installing the stern tube, the allowance at the end of the pipe is cut off according to the shape of the ship's outer plate to form the intersection line. Cutting off the end allowance to form the intersection line not only requires a high level of worker skills, but also takes a lot of time, prolonging the installation time of the stern tube and affecting the ship construction cycle.

[0003] Chinese invention patent CN107378407B discloses a construction method for large-section intersecting circular steel tube components. The method first uses 3D software to create a 3D model of the circular steel tube, directly generating the intersecting surface during the modeling process. Then, the 3D steel tube is unfolded to form a steel plate, with the end of the plate serving as the unfolded outline of the intersecting surface. The end faces of the steel plate are then machined, and the plate is rolled into a circle to obtain a steel tube with intersecting surfaces at the ends. This method eliminates the need to cut the intersecting line during installation, allowing the steel tube processing to proceed in parallel with the processing of other components. After all components are processed, rapid assembly is performed, significantly improving the installation efficiency of large pipe structures.

[0004] However, due to the complexity of ship outlines, most ship hull drawings are currently still created using line drawings, which include the lines of the ship's outer plating in the transverse, longitudinal, and height directions. It is impossible to derive the intersection line at the end of the stern tube using three-dimensional drawing. Therefore, to improve shipbuilding efficiency, there is an urgent need for a method that can derive the intersection line diagram of the stern tube end from the ship's line drawings. Summary of the Invention

[0005] Based on this, the purpose of this invention is to provide a method for drawing the intersection line of the stern shaft tubes, comprising the following steps:

[0006] Determine the neutral layer of the stern tube, and set multiple marker lines arranged parallel to the axis of the neutral layer at circumferential intervals around the neutral layer. Draw a side view of the neutral layer with each of the marker lines on CAD software.

[0007] An unfolded plan view of the neutral layer containing each of the aforementioned marker lines is drawn above or below the side view of the neutral layer, the unfolded plan view of the neutral layer being arranged parallel to the side view of the neutral layer;

[0008] Extract the longitudinal profiles of the ship's outer plating from the CAD profile drawing of the ship's outer plating, corresponding to the positions of the respective marking lines, and copy each of the longitudinal profiles to the side view of the neutral layer;

[0009] Starting from the intersection of each of the longitudinal profiles and the corresponding identification lines, a first projection line is drawn onto the unfolded planar view of the neutral layer;

[0010] The intersection points of each of the first projection lines and the corresponding marker lines in the unfolded planar diagram of the neutral layer are sequentially connected to form the intersection line unfolded line of the first end of the stern tube.

[0011] As a preferred embodiment, each of the marking lines is arranged at uniform intervals around the neutral layer in a circumferential direction.

[0012] As a preferred embodiment, the total number of all the marker lines is a multiple of 4, and one of the marker lines is located in the top quadrant of the neutral layer.

[0013] As a preferred embodiment, when drawing the unfolded planar diagram of the neutral layer, the top quadrant point of the neutral layer is used as the center.

[0014] As a preferred option, when extracting the longitudinal profile from the CAD profile drawing of the ship's outer plating, the longitudinal profile is selected based on the distance between the centerline of the stern tube and the longitudinal center plane of the hull.

[0015] As a preferred embodiment, the distance between each of the longitudinal profile lines and the longitudinal center plane of the hull is equal to the distance between the corresponding marking line and the longitudinal center plane of the hull.

[0016] As a preferred embodiment, the intersection points of each of the projection lines and the corresponding marker lines in the unfolded planar diagram of the neutral layer are sequentially connected by spline curves to form the intersection line unfolded line of the first end of the stern tube.

[0017] As a preferred embodiment, before drawing a side view of the neutral layer with each of the aforementioned marker lines on CAD software, the following steps are included:

[0018] First, draw the main view of the neutral layer on the CAD, then draw multiple marker points on the main view, and finally draw the side view of the neutral layer using the main view.

[0019] As a preferred embodiment, after drawing the unfolded plan view of the neutral layer above or below the side view of the neutral layer, the following steps are included:

[0020] In the side view of the neutral layer, draw the rib line at the second end of the stern tube. Starting from the intersection of the rib line and each of the marking lines, draw a second projection line in the direction of the unfolded plan view of the neutral layer.

[0021] The intersection points of each of the second projection lines and the corresponding marker lines in the unfolded planar diagram of the neutral layer are sequentially connected to form the intersection line unfolded line of the second end of the stern tube.

[0022] A stern tube is manufactured by rolling a sheet metal into a circle. The end of the sheet metal is machined with an intersecting line development line, which is obtained by the stern tube intersecting line drawing method according to any one of claims 1 to 9.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] The method for drawing the intersection line of the stern tube according to the present invention includes the following steps: determining the neutral layer of the stern tube; circumferentially arranging multiple marker lines parallel to the axis of the neutral layer around the neutral layer; drawing a side view of the neutral layer with each marker line on CAD software; drawing an unfolded plan view of the neutral layer containing each marker line above or below the side view of the neutral layer, the unfolded plan view of the neutral layer being parallel to the side view of the neutral layer; extracting the longitudinal profile lines of the ship's outer plating corresponding to the positions of each marker line from the CAD profile drawing of the ship's outer plating. Each longitudinal profile is copied to the side view of the neutral layer; starting from the intersection of each longitudinal profile and the corresponding marker line, a first projection line is drawn to the unfolded plan view of the neutral layer; the intersections of each first projection line and the corresponding marker line in the unfolded plan view of the neutral layer are connected in sequence to form the intersection line unfolded line of the first end of the stern tube; the stern tube intersection line drawing method of the present invention can draw the intersection line unfolded line of the first end of the stern tube using a two-dimensional drawing of the longitudinal profile of the ship's outer plate, so that the stern tube can be processed in parallel with other components, thereby improving the installation efficiency of the stern tube. Attached Figure Description

[0025] Figure 1 This is a side view of the ship's hull.

[0026] Figure 2 This is a rear view of the ship's hull.

[0027] Figure 3 This is a schematic diagram showing the structural position of the stern tube center relative to the hull center;

[0028] Figure 4 A schematic diagram illustrating the method for drawing the intersection line at the first end of the stern tube;

[0029] Figure 5 for Figure 4 Enlarged view of a portion of point A in the middle;

[0030] Figure 6 for Figure 4 Cross-sectional view at point BB;

[0031] Figure 7 A schematic diagram illustrating the method for drawing the intersection line at the second end of the stern tube;

[0032] Figure 8 To show the blanking diagram of the stern tube with 24 marking lines;

[0033] In the diagram, 100 is the stern tube mounting hole; 200 is the ship's outer plating; 300 is the longitudinal centerline of the hull; 400 is the side view of the neutral layer; 500 is the unfolded plan view of the neutral layer; 600 is the longitudinal profile; 700 is the unfolded line of the intersection of the first end of the stern tube; 800 is the unfolded line of the intersection of the second end of the stern tube; 900 is the rib line; L1 is the first marking line; L4 is the fourth marking line; L7 is the seventh marking line; L10 is the tenth marking line; L13 is the thirteenth marking line; L16 is the sixteenth marking line; L19 is the nineteenth marking line; L22 is the twenty-second marking line; LL1 is the first longitudinal profile; LL4 is the fourth longitudinal profile; LL7 is the seventh longitudinal profile; LL10 is the tenth longitudinal profile; LL13 is the thirteenth longitudinal profile; LL16 is the sixteenth longitudinal profile; LL19 is the nineteenth longitudinal profile; LL22 is the twenty-second longitudinal profile. Detailed Implementation

[0034] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0035] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be understood that the terms "first," "second," etc., are used in this invention to describe various information, but this information should not be limited to these terms; these terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0036] A method for drawing the intersection line of the stern tubes according to the present invention, such as... Figures 3 to 8As shown, the process includes the following steps: determining the neutral layer of the stern tube; setting multiple marker lines arranged parallel to the axis of the neutral layer at circumferential intervals around the neutral layer; drawing a side view 400 of the neutral layer with each marker line on CAD software; drawing an unfolded plan view 500 of the neutral layer containing each marker line above or below the side view 400 of the neutral layer, with the unfolded plan view 500 of the neutral layer arranged parallel to the side view 400 of the neutral layer; extracting the longitudinal profiles of the ship's outer plate 200 corresponding to the positions of each marker line from the CAD profile drawing of the ship's outer plate, and copying each longitudinal profile to the side view 400 of the neutral layer; drawing a first projection line to the unfolded plan view 500 of the neutral layer, starting from the intersection point of each longitudinal profile and the corresponding marker line; and sequentially connecting the intersection points of each first projection line and the corresponding marker line in the unfolded plan view 500 of the neutral layer to form the intersection line unfolded line of the first end of the stern tube. The intersection line of the first end of the stern tube can be drawn using a two-dimensional drawing of the longitudinal profile of the ship's outer plate, allowing the stern tube to be processed in parallel with other components, thus improving the installation efficiency of the stern tube.

[0037] To ensure the accuracy of the drawn intersection line development line at the first end of the stern tube, each marker line is arranged at a uniform interval around the circumference of the neutral layer. The total number of marker lines is a multiple of 4, and one of each marker line is located in the top quadrant of the neutral layer. Specifically, in this embodiment, there are 24 marker lines, which are arranged at a uniform interval around the circumference of the neutral layer. For easy identification, the attached diagram of this embodiment... Figure 3 To be continued Figure 7 Only the first marker line L1, the fourth marker line L4, the seventh marker line L7, the tenth marker line L10, the thirteenth marker line L13, the sixteenth marker line L16, the nineteenth marker line L19, and the twenty-second marker line L22 are displayed. For example... Figure 3 , Figure 4 As shown, when drawing the unfolded planar diagram 500 of the neutral layer, it is unfolded with the top quadrant point of the neutral layer as the center. That is, the unfolded planar diagram 500 of the neutral layer can be understood as cutting the neutral layer along the thirteenth marker line L13, and the cut neutral layer is centered on the first marker line L1. Figure 4 The fourth, seventh, and tenth marking lines, located above the first marking line L1, belong to the extended portion of the lateral semicircle. Figure 4 The sixteenth marker line L16, the nineteenth marker line L19, and the twenty-second marker line L22, located below the first marker line L1, belong to the expanded portion of the central semicircle. The central semicircle refers to... Figure 2 , Figure 3 The semicircle 300 degrees from the longitudinal centerline of the hull. For example... Figure 5As shown, longitudinal profile 600 includes the first longitudinal profile LL1, the fourth longitudinal profile LL4, the seventh longitudinal profile LL7, the tenth longitudinal profile LL10, the thirteenth longitudinal profile LL13, the sixteenth longitudinal profile LL16, the nineteenth longitudinal profile LL19, and the twenty-second longitudinal profile LL22. When extracting longitudinal profiles from the CAD profile drawing of the ship's outer plating, each longitudinal profile is selected based on the distance between the centerline of the stern tube and the longitudinal center plane of the hull. The distance between each longitudinal profile and the longitudinal center plane of the hull is equal to the distance between the corresponding marker line and the longitudinal center plane of the hull. Specifically, the distance between the seventh longitudinal profile LL7 and the longitudinal center plane of the hull is equal to the distance between the seventh marker line L7 and the longitudinal center plane of the hull. The distances between the fourth longitudinal profile LL4, the tenth longitudinal profile LL10, and the seventh marker line L7 are all equal to the distances between them. Figure 4 As shown, in the side view, the fourth marker line L4 coincides with the twenty-second marker line L22, the seventh marker line L7 coincides with the nineteenth marker line L19, and the tenth marker line L10 coincides with the sixteenth marker line L16. Figure 5 , Figure 6 As shown, since the distance between the tenth longitudinal line LL10 and the longitudinal center plane of the hull, and the distance between the fourth longitudinal line LL4 and the longitudinal center plane of the hull, are equal, the tenth longitudinal line LL10 and the fourth longitudinal line LL4 are at... Figure 5 The projection line at the intersection of the first longitudinal profile line LL1 and the first marker line L1 is described below as an example. The projection line at the intersection of the first longitudinal profile line LL1 and the first marker line L1 starts from the intersection of the first longitudinal profile line LL1 and the first marker line L1 and extends upward perpendicularly to the first marker line L1 until it intersects with the first marker line L1 in the unfolded plan view 500 of the neutral layer, forming an intersection line marker point. By drawing the intersection line marker points corresponding to each marker line in sequence, the intersection line unfolded line 700 of the first end of the stern tube can be formed.

[0038] Furthermore, the intersection points of each projection line and the corresponding marker line in the unfolded planar diagram 500 of the neutral layer are sequentially connected by spline curves to form the intersection line unfolded line of the first end of the stern tube.

[0039] In this embodiment, as Figure 3 As shown, before drawing the side view of the neutral layer with each marker line on the CAD software, the process includes: first drawing the main view of the neutral layer on the CAD software, drawing multiple marker points on the main view, and then drawing the side view of the neutral layer using the main view.

[0040] The second end of the stern tube needs to intersect with the transversely arranged ribs. In this embodiment, for example... Figure 7 As shown, after drawing the unfolded plan view of the neutral layer above or below the side view of the neutral layer, the process includes: drawing the rib line 900 at the second end of the stern tube in the side view 400 of the neutral layer; taking the intersection of the rib line 900 and each marker line as the starting point, drawing a second projection line in the direction of the unfolded plan view 500 of the neutral layer; and sequentially connecting the intersections of each second projection line and the corresponding marker line in the unfolded plan view 500 of the neutral layer to form the intersection line unfolded line 800 of the second end of the stern tube.

[0041] One embodiment of a stern tube is wherein the stern tube is processed by rolling a sheet metal into a circle, and the end of the sheet metal is processed with an intersecting line development line, which is obtained by the above-described method for drawing intersecting lines of stern tubes.

[0042] In summary, the stern tube intersection line drawing method of the present invention includes the following steps: determining the neutral layer of the stern tube; setting multiple marker lines arranged parallel to the axis of the neutral layer at circumferential intervals around the neutral layer; drawing a side view 400 of the neutral layer with each marker line on CAD software; drawing an unfolded plan view 500 of the neutral layer containing each marker line above or below the side view 400 of the neutral layer, the unfolded plan view 500 of the neutral layer being arranged parallel to the side view 400 of the neutral layer; extracting the longitudinal profiles of the ship's outer plate 200 corresponding to the positions of each marker line from the CAD profile drawing of the ship's outer plate; copying each longitudinal profile to the side view 400 of the neutral layer; drawing a first projection line to the unfolded plan view 500 of the neutral layer, starting from the intersection point of each longitudinal profile and the corresponding marker line; and sequentially connecting the intersection points of each first projection line and the corresponding marker line in the unfolded plan view 500 of the neutral layer to form the intersection line unfolded line of the first end of the stern tube. The intersection line of the first end of the stern tube can be drawn using a two-dimensional drawing of the longitudinal profile of the ship's outer plate, allowing the stern tube to be processed in parallel with other components, thus improving the installation efficiency of the stern tube.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for drawing the intersection line of the stern shaft tubes, characterized in that, Includes the following steps: Determine the neutral layer of the stern tube, and set multiple marker lines arranged parallel to the axis of the neutral layer at circumferential intervals around the neutral layer. Draw a side view of the neutral layer with each of the marker lines on CAD software. An unfolded plan view of the neutral layer containing each of the aforementioned marker lines is drawn above or below the side view of the neutral layer, the unfolded plan view of the neutral layer being arranged parallel to the side view of the neutral layer; Extract the longitudinal profiles of the ship's outer plating from the CAD profile drawing of the ship's outer plating, corresponding to the positions of the respective marking lines, and copy each of the longitudinal profiles to the side view of the neutral layer; Starting from the intersection of each of the longitudinal profiles and the corresponding identification lines, a first projection line is drawn onto the unfolded planar view of the neutral layer; The intersection points of each of the first projection lines and the corresponding marking lines in the unfolded planar diagram of the neutral layer are sequentially connected to form the intersection line unfolded line of the first end of the stern tube; Each of the aforementioned marking lines is arranged at uniform intervals around the circumference of the neutral layer; The total number of all the aforementioned marker lines is a multiple of 4, and one of the aforementioned marker lines is located in the top quadrant of the neutral layer; When drawing the unfolded planar diagram of the neutral layer, the top quadrant point of the neutral layer is used as the center.

2. The method for drawing the intersection line of the stern tubes according to claim 1, characterized in that, When extracting longitudinal profiles from the CAD profile drawing of the ship's outer plating, the longitudinal profiles are selected based on the distance between the centerline of the stern tube and the longitudinal center plane of the hull.

3. The method for drawing the intersection line of the stern tubes according to claim 1, characterized in that, The distance between each of the longitudinal profile lines and the longitudinal center plane of the hull is equal to the distance between the corresponding marking line and the longitudinal center plane of the hull.

4. The method for drawing the intersection line of the stern tubes according to claim 1, characterized in that, The intersection points of each projection line and the corresponding marker line in the unfolded planar diagram of the neutral layer are sequentially connected using spline curves to form the intersection line unfolded line of the first end of the stern tube.

5. The method for drawing the intersection line of the stern tubes according to claim 1, characterized in that, Before drawing a side view of the neutral layer with each of the aforementioned marker lines on CAD software, the following steps are included: First, draw the main view of the neutral layer on the CAD, then draw multiple marker points on the main view, and finally draw the side view of the neutral layer using the main view.

6. The method for drawing the intersection line of the stern tubes according to claim 1, characterized in that, After drawing an unfolded plan view of the neutral layer above or below the side view of the neutral layer, the following is included: In the side view of the neutral layer, draw the rib line at the second end of the stern tube. Starting from the intersection of the rib line and each of the marking lines, draw a second projection line in the direction of the unfolded plan view of the neutral layer. The intersection points of each of the second projection lines and the corresponding marker lines in the unfolded planar diagram of the neutral layer are sequentially connected to form the intersection line unfolded line of the second end of the stern tube.

7. A stern tube, characterized in that, The plate is processed by rolling it into a circle, and the end of the plate is processed with an intersection line development line. The intersection line development line is obtained by the stern tube intersection line drawing method according to any one of claims 1 to 6.

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