Method for marking the waterline when a ship is fully loaded

Abstract

A method for marking the waterline at full load on a ship comprises the following steps: Step 1: Establishing a reference plane; Step 2: Preparing a movable tangent as the baseline for marking; Step 3: The operator straightens the movable tangent and places it against the reference line, ensuring the movable tangent intersects at least two reference lines; Step 4: The point where the movable tangent contacts the ship's side plating is designated as the starting point for marking; Step 5: Marking begins from this starting point using marking equipment; Step 6: The operator rotates the movable tangent at a certain angle and stops, bringing it into contact with the ship's side plating, then continues marking using the marking equipment; Step 7: Repeating Step 6, marking multiple positioning lines around the ship's side plating; Step 8: Finally, connecting the multiple positioning lines completes the marking of the waterline at full load. This method offers fast marking speed, eliminates the need for expensive measuring instruments, and has low marking costs.

Description

Technical Field

[0001] This invention belongs to the field of ship marking technology, and specifically relates to a method for marking the waterline of a fully loaded ship. Background Technology

[0002] In modern shipbuilding, slipway jigs are arranged horizontally or inclined. To facilitate the ship's sliding motion during launch, most shipyards, especially small and medium-sized shipyards, use inclined slipways with inclined jigs for construction. After assembly in this inclined slipway construction mode, the ship's full-load waterline needs to be accurately marked. Because the ship is placed on an inclined slipway, especially in areas with significant changes in bow and stern curvature, marking with modern measuring instruments is quite cumbersome. To simplify this process, our company is developing a wire-drawing method for marking. However, we lack a marking platform to support the wires and facilitate their formation as a reference surface.

[0003] Conventional line marking methods require the erection of scaffolding or the direct welding of scaffolding onto the ship's surface for operation. Erecting scaffolding is a massive, time-consuming, and labor-intensive project, while welding scaffolding onto the ship's hull involves numerous tedious tasks such as dismantling, grinding, and repainting, making it very uneconomical. There is a need to invent a simple, mobile, and easy-to-operate method for marking waterlines on ships at full load on inclined slipways. Summary of the Invention

[0004] In view of the technical problems existing in the background art, the method for marking the waterline of a fully loaded ship provided by the present invention has the advantages of fast marking speed, no need to use expensive measuring instruments, and low marking cost.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A method for marking the waterline of a fully loaded ship, comprising the following steps:

[0007] Step 1: Establish the reference plane: Prepare at least four marking stands, placing two stands at each end of the vessel, with the two stands at the bow and stern located on the port and starboard sides respectively. Install reference lines on the four marking stands; the multiple reference lines together form a reference plane; the reference plane is the plane containing the full-load waterline.

[0008] Step 2: Prepare a movable tangent line as the baseline for marking. The two ends of the movable tangent line are controlled by the operators. The operators are carried by a lift or a movable support platform.

[0009] Step 3: The operator straightens the movable tangent and aligns it with the baseline, ensuring that the movable tangent intersects at least two baselines;

[0010] Step 4: The movable tangent is aligned with the outer plating of the ship's side, and the point where the movable tangent contacts the outer plating of the ship's side is taken as the starting point for the marking.

[0011] Step 5: Use a marking device to start marking the line from the starting point;

[0012] Step 6: The operator rotates the movable tangent line to a certain angle and then stops, so that the movable tangent line contacts the outer plating of the ship's side. Then, the marking equipment is used to continue marking the line; the line marked in this step is the positioning line.

[0013] Step 7: Repeat the operation of Step 6 to complete the marking of multiple positioning lines around the outer plating of the ship's side;

[0014] Step 8: Finally, connect the multiple positioning lines to complete the marking of the full-load waterline.

[0015] Preferably, in step 1, there are four marking stands, which are arranged in a rectangular pattern; the distance between the marking stands and the ship is greater than 1m.

[0016] Preferably, in step 1, the reference line is a steel wire.

[0017] Preferably, in step 2, the movable tangent is a nylon thread.

[0018] Preferably, in step 6, when drawing positioning lines, the angle of rotation of the movable tangent is not fixed each time. When changing the angle of the movable tangent, the movable tangent is kept on the reference plane, and the distance between two adjacent positioning lines is 2-5m. The distance between two adjacent positioning lines is determined by the angle of rotation of the movable tangent.

[0019] Preferably, the marking frame for the full-load waterline marking method of a ship includes a support frame, a workbench on the top of the support frame, a ladder on the support frame, an mounting frame on the workbench, and a line-laying device and a tension adjustment device on the mounting frame; the tension adjustment device includes a reference frame connected to the mounting frame, an adjustment cap rotatably mounted on the reference frame, the adjustment cap threadedly engaging with a lead screw, and a line-threading hook at the end of the lead screw.

[0020] In a preferred embodiment, the wire feeding device includes a support connected to the mounting frame, and a wire feeding roller is provided on the support. The wire feeding roller is used to feed and take in steel wire, and the wire feeding roller is driven to rotate by a crank handle. The crank handle is locked by a locking member.

[0021] In a preferred embodiment, the wire feeding roller is provided with bushings at both ends, and the locking element is a locking screw, which is installed on the bushing.

[0022] In a preferred embodiment, the reference frame is provided with a sliding groove, which is adapted to a sliding rod, and the sliding rod is connected to a lead screw; the rotating adjustment cap is used to adjust the extension and retraction of the threading hook.

[0023] In a preferred embodiment, the workbench is equipped with a railing.

[0024] The present invention can achieve the following beneficial effects:

[0025] 1. This method is fast and does not require expensive measuring instruments, resulting in low scribing costs.

[0026] 2. This invention provides a marking frame for marking water lines. The marking frame is equipped with a ladder, a workbench, a line-laying device, and a tension adjustment device. The ladder facilitates workers' access to work at height, the workbench provides a standing platform for workers, the line-laying device is used for laying and reeling in the steel wire, and the tension adjustment device can tighten the steel wire to ensure its straightness. This invention provides a pre-processing device for marking operations, making it easy to form a reference surface using steel wire. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] Figure 1 This is a schematic diagram illustrating the principle of line marking in this invention;

[0029] Figure 2 This is a diagram showing the layout of the marking platform for this invention.

[0030] Figure 3 This is a front view of the scribing stand of the present invention;

[0031] Figure 4 This is a schematic diagram illustrating the principle of the present invention's method of marking waterlines using two fully loaded ships.

[0032] Figure 5 This is a partial enlarged view of the top of the scribing platform of the present invention;

[0033] Figure 6 This is a structural diagram of the wire feeding device and tension adjustment device of the present invention.

[0034] In the diagram: 1. Support frame; 2. Workbench; 3. Ladder; 4. Mounting frame; 5. Wire feeding device; 501. Support; 502. Wire feeding roller; 503. Steel wire; 504. Handle; 505. Bushing; 506. Locking screw; 6. Tension adjustment device; 6. Reference frame; 601. Adjusting cap; 602. Lead screw; 603. Wire threading hook; 604. Slide bar; 605. Fence; 7. Full-load water line; 8. Marking starting point; 9. Positioning line; 10. Detailed Implementation

[0035] Example 1:

[0036] Preferred solutions include Figures 1 to 6 As shown, a method for marking the waterline of a fully loaded ship includes the following steps:

[0037] Step 1: Establish the reference plane: Prepare at least four marking stands, placing two marking stands at each end of the ship, with the two marking stands at the bow or stern located on the port and starboard sides of the ship, respectively; install reference lines on the four marking stands, and the multiple reference lines together form a reference plane; the reference plane is the plane where the full load waterline is located; the reference lines are steel wires.

[0038] There are four marking stands, which are arranged in a rectangular pattern; the distance between the marking stands and the ship is greater than 1 meter.

[0039] Step 2: Prepare a movable tangent line as the baseline for marking. The two ends of the movable tangent line are controlled by the operator. The operator is supported by a lift or a support platform that is easy to move. The movable tangent line is a nylon line (ink line).

[0040] Step 3: The operator straightens the movable tangent and aligns it with the baseline, ensuring that the movable tangent intersects at least two baselines;

[0041] Step 4: The movable tangent is aligned with the outer plating of the ship's side, and the point where the movable tangent contacts the outer plating of the ship's side is taken as the starting point for the marking.

[0042] like Figure 1 As shown, the two endpoints of the movable tangent are A1 and B1, respectively;

[0043] Step 5: Use a marking device to start marking the line from the starting point;

[0044] Step 6: The operator rotates the movable tangent line to a certain angle and then stops, so that the movable tangent line contacts the outer plating of the ship's side. Then, the marking equipment is used to continue marking the line; the line marked in this step is the positioning line.

[0045] like Figure 1 As shown, after the movable tangent rotates, the two endpoints of the movable tangent are represented by A2 and B2, respectively. Similarly, after n rotations, the two endpoints of the movable tangent are An and Bn, respectively; A and B represent the two endpoints of the movable tangent, and n represents the number of rotations.

[0046] When marking positioning lines, the angle of rotation of the movable tangent is not fixed each time. When changing the angle of the movable tangent, ensure that the movable tangent is located on the reference plane. The distance between two adjacent positioning lines is 2-5m. The distance between two adjacent positioning lines is determined by the rotation angle of the movable tangent.

[0047] Preferably, after marking is done, flat steel (30×15×4) can be welded evenly at intervals of about 3m to form the markings.

[0048] In this step, the method of first drawing positioning lines and then connecting them is adopted. If continuous full-load waterline lines are drawn directly, it is also within the scope of the concept of this invention.

[0049] Step 7: Repeat the operation of Step 6 to complete the marking of multiple positioning lines around the outer plating of the ship's side;

[0050] Step 8: Finally, connect the multiple positioning lines to complete the marking of the full-load waterline.

[0051] After the markings are completed, the paint color above and below the full load waterline is applied according to the paint design, with the number of base coats and top coats following the paint specifications. Finally, the permanent full load waterline markings are welded on.

[0052] A marking stand for marking waterline lines on a fully loaded ship includes a support frame 1, a workbench 2 on top of the support frame 1, a ladder 3 on the support frame 1, an mounting frame 4 on the workbench 2, a line-laying device 5 and a tension adjusting device 6 on the mounting frame 4; the tension adjusting device 6 includes a reference frame 601 connected to the mounting frame 4, an adjusting cap 602 rotatably mounted on the reference frame 601, the adjusting cap 602 threadedly engaging with a lead screw 603, and a line-threading hook 604 at the end of the lead screw 603.

[0053] Tension adjusting device 6 is installed below wire feeding device 5, which is used to feed and reel in steel wire, which passes through wire feeding hook 604. Figure 2 As shown, when using this device, it is generally used in conjunction with the waterline marking method for every two ships at full load. First, the steel wire is pre-tensioned, and then the steel wire is tightened through the tension adjustment device 6.

[0054] When marking the full load line of a ship, four full load waterline marking methods are generally set up. Each full load waterline marking method can be equipped with two sets of line laying devices 5 and tension adjustment devices 6. The four full load waterline marking methods are arranged in a square position, and the four steel wires form a reference plane.

[0055] Furthermore, the wire feeding device 5 includes a support 501 connected to the mounting frame 4, on which a wire feeding roller 502 is mounted. The wire feeding roller 502 is used to feed and take in the steel wire 503. The wire feeding roller 502 is driven to rotate by a crank handle 504. The crank handle 504 is locked by a locking device. The operator feeds and takes in the steel wire by operating the crank handle 504. After the steel wire is fed in, the wire feeding roller 502 is locked by the locking device.

[0056] Specifically, the pay-off roller 502 has bushings 505 at both ends, and locking screws 506 are used for locking. The locking screws 506 are installed on the bushings 505. The locking screws 506 are threadedly connected to the bushings 505, and tightening the locking screws 506 is used to lock the pay-off roller 502.

[0057] Furthermore, the reference frame 601 is provided with a sliding groove, which is adapted to the sliding rod 605, and the sliding rod 605 is connected to the lead screw 603; the rotating adjusting cap 602 is used to adjust the extension and retraction of the threading hook 604. The adjusting cap 602 is connected to the reference frame 601 through a tapered bearing. The sliding rod 605 is used to slide in the sliding groove to prevent the threading hook 604 from rotating and to prevent the wire from tilting after the threading hook 604 rotates. Therefore, the movement of the threading hook 604 is linear. After the wire is unloaded, the unloading roller 502 is locked, and finally the threading hook 604 is retracted to further tighten the wire.

[0058] Furthermore, a railing 7 is provided on the workbench 2. The railing 7 is used to ensure the safety of the operator.

[0059] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for marking the waterline of a fully loaded ship, characterized in that... Includes the following steps: Step 1: Establish the reference plane: Prepare at least four marking stands, and place two marking stands at each end of the ship, with the two marking stands at the bow or stern located on the port and starboard sides of the ship, respectively; install reference lines on the four marking stands, and the multiple reference lines enclose to form a reference plane; the reference plane is the plane where the full load waterline is located. Step 2: Prepare a movable tangent line as the baseline for marking. The two ends of the movable tangent line are controlled by the operators. The operators are carried by a lift or a movable support platform. Step 3: The operator straightens the movable tangent and aligns it with the baseline, ensuring that the movable tangent intersects at least two baselines; Step 4: The movable tangent is aligned with the outer plating of the ship's side, and the point where the movable tangent contacts the outer plating of the ship's side is taken as the starting point for the marking. Step 5: Use a marking device to start marking the line from the starting point; Step 6: The operator rotates the movable tangent line to a certain angle and then stops, so that the movable tangent line contacts the outer plating of the ship's side. Then, the marking equipment is used to continue marking the line; the line marked in this step is the positioning line. Step 7: Repeat the operation of Step 6 to complete the marking of multiple positioning lines around the outer plating of the ship's side; Step 8: Finally, connect the multiple positioning lines to complete the marking of the full-load waterline.

2. The method for marking the waterline of a ship at full load according to claim 1, characterized in that: In step 1, there are four marking platforms, which are arranged in a rectangular pattern; the distance between the marking platforms and the ship is greater than 1m.

3. The method for marking the waterline of a ship at full load according to claim 1, characterized in that: In step 1, the reference line is a steel wire.

4. The method for marking the waterline of a ship at full load according to claim 1, characterized in that: In step 2, the movable tangent is made of nylon.

5. The method for marking the waterline at full load on a ship according to claim 1, characterized in that: In step 6, when drawing positioning lines, the angle of rotation of the movable tangent is not fixed each time. When changing the angle of the movable tangent, ensure that the movable tangent is located on the reference plane. The distance between two adjacent positioning lines is 2-5m. The distance between two adjacent positioning lines is determined by the rotation angle of the movable tangent.

6. The marking stand for the ship full-load waterline marking method according to any one of claims 1-5, characterized in that: The device includes a support frame (1), a workbench (2) on top of the support frame (1), a ladder (3) on the support frame (1), an installation frame (4) on the workbench (2), a wire feeding device (5) and a tension adjusting device (6) on the installation frame (4); the tension adjusting device (6) includes a reference frame (601) connected to the installation frame (4), an adjusting cap (602) rotatably provided on the reference frame (601), the adjusting cap (602) threadedly engaging with the lead screw (603), and a wire hook (604) at the end of the lead screw (603); The wire feeding device (5) includes a support (501) connected to the mounting frame (4), and a wire feeding roller (502) is provided on the support (501). The wire feeding roller (502) is used to feed and take in the steel wire (503). The wire feeding roller (502) is driven to rotate by a crank (504). The crank (504) is locked by a locking member. The reference frame (601) is provided with a sliding groove, which is adapted to the sliding rod (605). The sliding rod (605) is connected to the lead screw (603). The rotating adjustment cap (602) is used to adjust the extension and retraction of the threading hook (604).

7. The marking stand for the ship full-load waterline marking method according to claim 6, characterized in that: The wire feeding roller (502) has bushings (505) at both ends, and the locking part is a locking screw (506), which is installed on the bushing (505).

8. The marking stand for the ship full-load waterline marking method according to claim 6, characterized in that: The workbench (2) is equipped with a railing (7).

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