A centering measurement method for shipbuilding

Abstract

The present invention provides a centering measurement method for shipbuilding, which relates to the field of centering measurement. The centering measurement method comprises the following steps: step 1, tying a chalk line above a reference plane, hanging a simulation block at the lower end of the chalk line, allowing the chalk line to naturally hang and remain stationary; step 2, removing the simulation block and hanging a plumb bob; step 3, placing a light source structure on the reference plane, the light source structure being located on one side of the plumb bob, and a segmented measurement surface being located outside the reference plane and corresponding to the other side of the plumb bob; step 4, turning on the light source structure to emit irradiation light toward the other side of the plumb bob, the irradiation light being parallel light, and the irradiation direction of the irradiation light forming an inclined angle with the plane where the reference plane is located; step 5, under the irradiation of the light source, a chalk line projection line is formed on the segmented measurement surface, adjusting the positions of the chalk line and the plumb bob so that the chalk line projection line coincides with the center line of the segmented structure, and observing the deviation value between the plumb bob tip projection and the center line of the reference plane to determine the centering accuracy of the segmented structure.

Description

Technical Field

[0001] The present invention relates to the technical field of centering measurement, in particular to a centering measurement method for shipbuilding. Background Art

[0002] During shipbuilding, plumb bobs are used for alignment during block fabrication, assembly, and installation. By measuring whether the centerlines of each block are aligned, the docking accuracy of the ship's sections is determined.

[0003] For example, the Chinese invention patent application with application publication number CN112208722A and application publication date 2021.01.12 discloses a slipway auxiliary segment positioning device and a method for using the same, the method specifically including the following steps: 1. Place the slipway auxiliary segment positioning device on the slipway, and adjust the position of the fixed frame so that the longitudinal center line of the base of the fixed frame coincides with the center line of the slipway; 2. Adjust the horizontality of the base through the height adjustment mechanism until the projection of the pendulum is on the center line of the slipway; then rotate the laser emitter, when the laser beam point emitted by the laser emitter is located on the center line of the slipway, the fixed frame is in a horizontal state; 3. Rotate the laser emitter so that the laser beam point emitted by the laser emitter is projected onto one end face of the ship segment, and adjust the position of the ship segment so that the multiple laser beam points emitted by the rotating laser emitter are all shot at the center line of one end face of the ship segment; 4. Repeat steps one to three to position the other end of the ship segment.

[0004] The existing method for using a slipway-assisted segment positioning device uses a rotatable laser emitter to project a laser beam onto a ship segment. The slipway centerline verifies the center plane of the ship segment, ensuring a higher degree of alignment between the ship segment and the slipway center. However, this existing measurement method requires repeated laser beam projection, making segment alignment difficult and inefficient. Summary of the Invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a centering measurement method for ship construction to solve the problems that the existing measurement method requires repeated operations for laser beam point projection, the segmented centering operation is difficult, and the centering measurement efficiency is low.

[0006] The technical solution of the centering measurement method for shipbuilding of the present invention is:

[0007] The alignment measurement method for ship construction includes the following steps:

[0008] Step 1: Tie the powder line above the reference surface, hang a simulation block at the lower end of the powder line, and use the gravity of the simulation block to stretch the powder line so that the powder line hangs naturally and remains stationary;

[0009] Step 2: Remove the simulation block and hang a plumb bob, ensuring that the tip of the plumb bob points to the center line of the reference surface;

[0010] Step 3: Place a light source structure on the reference plane, adjust the bottom midline of the light source structure to coincide with the centerline of the reference plane, the light source structure is located on one side of the plumb bob, and the segmented measurement surface is located outside the reference plane and corresponds to the other side of the plumb bob;

[0011] Step 4: Turn on the light source structure to emit irradiation light toward the other side of the plumb bob, wherein the irradiation light emitted by the light source structure is parallel light, and the irradiation direction of the irradiation light forms an inclined angle with the plane where the reference surface is located;

[0012] Step 5: Under the illumination of a light source, a chalk line projection line is formed on the segmented measuring surface. The positions of the chalk line and the plumb bob are adjusted so that the chalk line projection line coincides with the center line of the segmented structure. The deviation value between the hammer tip projection of the plumb bob and the center line of the reference surface is observed to determine the centering accuracy of the segmented structure.

[0013] As a further preferred solution, in step 4, the inclined angle formed by the irradiation direction of the irradiation light and the plane where the reference surface is located is an acute angle less than 30°.

[0014] As a further preferred solution, in step 4, the inclined angle formed by the irradiation direction of the irradiation light and the plane where the reference surface is located is any angle between 3° and 15°.

[0015] As a further preferred solution, the light source structure includes a light source body and a base, the light source body is installed on the base, the bottom center line is set on the base, and the illumination center line of the light source body and the bottom center line are in the same vertical plane.

[0016] As a further preferred solution, the light source body is rotatably mounted on the base, a handle is further provided on the light source body, and the rotation axis of the light source body is perpendicular to the vertical plane where the bottom midline is located.

[0017] As a further preferred solution, in step 2, a first magnetic block is provided at the lower end of the powder line, and a second magnetic block is provided at the upper end of the bobbin. The first magnetic block and the second magnetic block are attracted to each other to quickly hang the bobbin on the lower end of the powder line.

[0018] As a further preferred solution, in step 2, the first magnetic block is a cylindrical magnet, and the lower end of the powder wire is connected to the hanging hole at the upper end of the first magnetic block;

[0019] The plumb bob is a conical plumb bob, the second magnetic block is a cylindrical magnet, the second magnetic block is fixedly connected to the top center of the plumb bob, and the second magnetic block and the plumb bob are on the same axis.

[0020] As a further preferred solution, in step one, a hook is provided at the lower end of the powder line, and a hanging ring is provided in the middle of the top of the simulation block. The hook of the powder line is coordinated with the hanging ring of the simulation block to hang the simulation block to the lower end of the powder line, and the suspended height of the simulation block relative to the reference plane is any distance between 100 mm and 300 mm.

[0021] Beneficial effects: The centering measurement method for ship construction adopts: 1. Use a simulation block to hang at the lower end of the chalk line, so that the chalk line hangs naturally and remains stationary; 2. Replace the plumb bob so that the hammer tip of the plumb bob points to the center line of the reference surface; 3. Place the light source structure so that the segmented measuring surface is located outside the reference surface and corresponds to the other side of the plumb bob; 4. Turn on the light source structure to emit irradiation light toward the other side of the plumb bob; 5. Adjust the position of the chalk line and the plumb bob so that the projection line of the chalk line coincides with the center line of the segmented structure, and observe the deviation value between the projection of the hammer tip of the plumb bob and the center line of the reference surface.

[0022] First, suspend the dummy block at the lower end of the powder line. Gravity pulls on the powder line, causing it to rotate and stretch, allowing it to quickly untangle and rest. Using the dummy block instead of the bob eliminates the problem of the bob falling to the ground after the powder line is unfurled and stretched, which can easily cause wear. Suspending the dummy block at the lower end of the powder line and keeping it suspended ensures that the powder line can fully rotate and untangle, allowing any tangled powder line to be untangled early, improving the efficiency of alignment measurements.

[0023] The illumination light emitted by the light source structure is parallel light, so that the chalk line forms a chalk line projection line on the segmented measuring surface, and the plumb bob forms a hammer tip projection on the reference surface. The positions of the chalk line and the plumb bob are adjusted so that the chalk line projection line coincides with the center line of the segmented structure. The deviation value between the plumb bob's hammer tip projection and the center line of the reference surface is observed to determine the centering accuracy of the segmented structure, eliminating the operation steps of multiple projections and improving the centering efficiency of the segmented structure and the reference surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A measurement schematic diagram of the centering measurement method for shipbuilding in a specific embodiment of the shipbuilding measurement method of the present invention;

[0025] Figure 2 A flowchart of the centering measurement method for shipbuilding in a specific embodiment of the shipbuilding method of the present invention;

[0026] Figure 3A three-dimensional schematic diagram of a light source structure in a specific embodiment of the shipbuilding alignment measurement method of the present invention;

[0027] Figure 4 A schematic diagram of the connection between the pink line and the simulation block in a specific embodiment of the shipbuilding alignment measurement method of the present invention;

[0028] Figure 5 This is a schematic diagram of the connection between the chalk line and the plumb bob in a specific embodiment of the shipbuilding alignment measurement method of the present invention.

[0029] In the figure: 1-reference plane, 10-center line of reference plane, 2-segment measurement plane, 20-center line of segment structure;

[0030] 3-powder line, 30-bolt, 31-simulation block, 32-first magnetic block, 33-second magnetic block, 34-hook, 35-hanging ring;

[0031] 4 - light source structure, 40 - irradiation light, 41 - bottom center line, 42 - light source body, 43 - base, 44 - side panel, 45 - rotating shaft, 46 - handle. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail with reference to 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.

[0033] Specific embodiment 1 of the centering measurement method for shipbuilding of the present invention is as follows Figures 1 to 5 As shown in the figure, the centering measurement method for ship construction is mainly used in the centering measurement process of ship block production, block assembly, and loading, and specifically includes the following steps:

[0034] Step 1: Tie the powder line 3 above the reference surface 1. Hang a dummy block 31 from the lower end of the powder line 3. Use the gravity of the dummy block 31 to stretch the powder line 3, allowing it to naturally droop and remain stationary. First, suspend the dummy block 31 from the lower end of the powder line 3. Gravity pulls the powder line 3, causing it to rotate and stretch, allowing the powder line 3 to quickly unwind and rest. Using the dummy block 31 instead of the bob 30 for suspension avoids the bob 30 from falling to the ground after the powder line 3 is unwound and stretched, which can easily cause wear and tear.

[0035] Specifically, in step 1, a hook 34 is provided at the lower end of the powder line 3, and a hanging ring 35 is provided at the top center of the simulation block 31. The hook 34 of the powder line 3 is used to mate with the hanging ring 35 of the simulation block 31 to suspend the simulation block 31 to the lower end of the powder line 3, and the suspension height of the simulation block 31 relative to the reference plane 1 is set to any distance between 100 mm and 300 mm. The simulation block 31 is suspended at the lower end of the powder line 3 and is in a suspended state, ensuring that the powder line 3 can be fully rotated and untangled. The tangled powder line 3 can be untangled in advance, thereby improving the efficiency of the centering measurement.

[0036] Step 2: Remove the simulation block 31 and hang the bob 30, making sure that the tip of the bob 30 points to the center line 10 of the reference plane; at this time, the powder line 3 is extended in the vertical direction, and the powder line 3 and the center line 10 of the reference plane form a vertical plane. By intersecting this vertical plane with the plane outside the reference plane 1, the extension line of the center line 10 of the reference plane can be obtained.

[0037] As a further preferred solution, in step 2, a first magnetic block 32 is provided at the lower end of the powder line 3, and a second magnetic block 33 is provided at the upper end of the plumb bob 30. The first magnetic block 32 and the second magnetic block 33 are attracted to each other to quickly suspend the plumb bob 30 at the lower end of the powder line 3. Specifically, the first magnetic block 32 is a cylindrical magnet, and the lower end of the powder line 3 is connected to the hanging hole at the upper end of the first magnetic block 32; the plumb bob 30 is a conical plumb bob, and the second magnetic block 33 is a cylindrical magnet. The second magnetic block 33 is fixedly connected to the top center of the plumb bob 30, and the second magnetic block 33 and the plumb bob 30 are coaxial. This ensures the coaxiality between the plumb bob 30 and the powder line 3 after the plumb bob 30 is magnetically mounted, thereby ensuring the accuracy of subsequent measurements.

[0038] Step 3: Place the light source structure 4 on the reference plane 1, and adjust the bottom centerline 41 of the light source structure 4 to coincide with the centerline 10 of the reference plane. The light source structure 4 is located on one side of the plumb bob 30, and the segmented measurement surface 2 is located outside the reference plane 1 and on the other side of the plumb bob 30. In this embodiment, the reference plane 1 and the segmented measurement surface 2 are arranged in a front-to-back arrangement, with the reference plane 1 located in front of the plumb bob 30 and the segmented measurement surface 2 located behind the plumb bob 30. Furthermore, the light source structure 4 is placed on the centerline 10 of the reference plane, providing a reference for the segmented structure to align when the light source structure 4 is irradiated backwards.

[0039] Step 4: Turn on the light source structure 4 to emit an illuminating light 40 toward the other side of the plumb bob 30. The illuminating light 40 emitted by the light source structure 4 is parallel light, and the irradiation direction of the illuminating light 40 forms an angle with the plane of the reference surface 1. In this embodiment, the irradiation direction of the illuminating light 40 forms an angle with the plane of the reference surface 1, and the angle is any angle between 3° and 15°.

[0040] Specifically, the light source structure 4 includes a light source body 42 and a base 43. The light source body 42 is mounted on the base 43, and the bottom centerline 41 is disposed on the base 43. The illumination centerline of the light source body 42 and the bottom centerline 41 are located in the same vertical plane. The base 43 is provided with two side panels 44, which are spaced apart and parallel to each other on either side of the bottom centerline 41. A rotating shaft 45 is rotatably mounted between the two side panels 44. The light source body 42 is connected to the rotating shaft 45. A handle 46 is also provided on the light source body 42. The rotation axis of the light source body 42 is perpendicular to the vertical plane of the bottom centerline 41. That is, the bottom centerline 41 of the light source structure 4 extends horizontally forward and backward, and the rotation axis of the light source body 42 extends horizontally left and right. The operating handle 46 allows the light source body 42 to swing about the rotating shaft 45 to adjust the illumination angle, so that the illumination light 40 emitted by the light source structure 4 is better projected onto the segmented measurement surface 2 and the reference surface 1.

[0041] Step 5. Under the illumination of the light source, a chalk line projection line is formed on the segmented measuring surface 2. The positions of the chalk line 3 and the plumb bob 30 are adjusted so that the chalk line projection line coincides with the center line 20 of the segmented structure. The deviation value between the hammer tip projection of the plumb bob 30 and the center line 10 of the reference surface is observed to determine the centering accuracy of the segmented structure, thereby improving the centering efficiency between the segmented structure and the reference surface 1.

[0042] In other specific embodiments of the centering measurement method for shipbuilding of the present invention, in order to meet different measurement requirements, the tilt angle formed by the illumination direction of the illumination light emitted by the light source structure and the plane where the reference plane is located is not limited to any angle between 3° and 15° in specific embodiment 1, and can be adaptively adjusted according to actual conditions, for example: the tilt angle is any angle between 0 and 10°, any angle between 3° and 20°, or any angle between 5° and 30°, or any acute angle less than 30°.

[0043] 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 centering measurement method for shipbuilding, characterized in that: The following steps are involved: Step 1: Tie the powder line above the reference surface, hang a simulation block at the lower end of the powder line, and use the gravity of the simulation block to stretch the powder line so that the powder line hangs naturally and remains stationary; Step 2: Remove the simulation block and hang a plumb bob, ensuring that the tip of the plumb bob points to the center line of the reference surface; Step 3: Place a light source structure on the reference plane, adjust the bottom midline of the light source structure to coincide with the centerline of the reference plane, the light source structure is located on one side of the plumb bob, and the segmented measurement surface is located outside the reference plane and corresponds to the other side of the plumb bob; Step 4: Turn on the light source structure to emit irradiation light toward the other side of the plumb bob, wherein the irradiation light emitted by the light source structure is parallel light, and the irradiation direction of the irradiation light forms an inclined angle with the plane where the reference surface is located; Step 5: Under the illumination of a light source, a chalk line projection line is formed on the segmented measurement surface. The positions of the chalk line and the plumb bob are adjusted so that the chalk line projection line coincides with the center line of the segmented structure. The deviation between the projection of the plumb bob tip and the center line of the reference surface is observed to determine the centering accuracy of the segmented structure. In step 4, the inclined angle formed by the irradiation direction of the irradiation light and the plane where the reference surface is located is an acute angle less than 30°.

2. The centering measurement method for shipbuilding according to claim 1, characterized in that: In step 4, the inclined angle formed by the irradiation direction of the irradiation light and the plane where the reference surface is located is any angle between 3° and 15°.

3. The centering measurement method for shipbuilding according to claim 1, characterized in that: The light source structure includes a light source body and a base. The light source body is installed on the base. The bottom center line is set on the base. The illumination center line of the light source body and the bottom center line are in the same vertical plane.

4. The centering measurement method for shipbuilding according to claim 3, characterized in that: The light source body is rotatably mounted on the base. A handle is also provided on the light source body. The rotation axis of the light source body is perpendicular to the vertical plane where the center line of the bottom is located.

5. The centering measurement method for shipbuilding according to claim 1, wherein In step 2, a first magnetic block is provided at the lower end of the powder line, and a second magnetic block is provided at the upper end of the wire bob. The first magnetic block and the second magnetic block are attracted to each other to quickly hang the wire bob at the lower end of the powder line.

6. The centering measurement method for shipbuilding according to claim 5, characterized in that In step 2, the first magnetic block is a cylindrical magnet, and the lower end of the powder wire is connected to the hanging hole at the upper end of the first magnetic block; The plumb bob is a conical plumb bob, the second magnetic block is a cylindrical magnet, the second magnetic block is fixedly connected to the top center of the plumb bob, and the second magnetic block and the plumb bob are on the same axis.

7. The centering measurement method for shipbuilding according to claim 1, characterized in that: In step one, a hook is provided at the lower end of the powder line, and a hanging ring is provided in the middle of the top of the simulation block. The hook of the powder line is coordinated with the hanging ring of the simulation block to hang the simulation block to the lower end of the powder line, and the suspended height of the simulation block relative to the reference plane is any distance between 100 mm and 300 mm.

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