Method for controlling the loading accuracy of a single propeller and single rudder stern drive type ship shafting after section boring

Abstract

The application relates to a single-paddle single-rudder stern machine type ship shafting segmentation boring post-lifting precision control method, which comprises the following steps: welding a triangular plate; vertically arranging a middle target to measure the distance from the joint of a bow segment and a bottom front segment to the middle target; drawing and marking a surplus line of the middle first segment, detecting and recording the surplus line error; respectively installing light targets on the front and rear end faces of a stern shaft tube; vertically arranging a center light target; drawing a cross line of the center light target and the middle target; placing a laser instrument and adjusting; adjusting the bow segment to make the four targets aligned; adjusting a support and fixing; loosening a lifting hook and rechecking; welding the bow segment, recording and correcting a welding sequence; and re-measuring the distance from the rear end face of the stern tube to the middle target and the deviation between the actual center line of the stern tube and a ship body baseline. The application can accurately and quickly judge the shafting segmentation deviation precision, facilitates on-site construction personnel to directly read data for precision adjustment in the process, reduces the working hour consumption in the ship dock total assembly lifting stage, and realizes the goals of process moving forward, cost reduction and benefit increase.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding, specifically to a method for controlling the accuracy of shafting after segmented boring of a single-propeller, single-rudder stern engine type ship. Background Technology

[0002] With the continuous advancement of refined construction, the precision requirements for shaft and rudder system sections in shipbuilding are also constantly increasing. In the traditional shaft system section assembly, the concentricity of the shaft and rudder system needs to be within 2mm. After the shaft and rudder system sections are completed, the concentricity needs to be within 2mm. After the shaft and rudder system sections are assembled, the shaft and rudder system is bored to ensure the concentricity of the sections. This method seriously affects the time consumption of the assembly operation. Moreover, the construction area is narrow and the construction environment is extremely harsh during the boring operation, making it difficult to guarantee the construction quality and the health of the construction personnel. Summary of the Invention

[0003] To address the technical problems existing in the prior art, this invention provides a method for controlling the assembly accuracy of shafting sections after boring in single-propeller, single-rudder stern engine type ships. This method can accurately and quickly determine the shafting section deviation accuracy, reducing the time consumption during the dock assembly stage.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A method for controlling the mounting accuracy of shafting sections after boring in a single-propeller, single-rudder, stern engine type vessel, the vessel including a bow section, a bow section, a first intermediate section, and a second intermediate section, the method including the following steps:

[0006] Step 1: Weld a triangular plate to the center line of the inner bottom plate at the front of the bottom segment;

[0007] Step 2: Erect an intermediate target on the inner bottom plate at the first bolt hole of the main engine of the ship, towards the first strong stop at the stern end, according to the center line of the hull, and measure the distance from the joint between the bow section and the bottom forward section to the intermediate target.

[0008] Step 3: Mark the allowance line on the first middle segment and cut the allowance when the bow segment is installed. After the bow segment is positioned, detect and record the error between the allowance line and the actual cut allowance.

[0009] Step 4: Install a light target on the front and rear ends of the stern tube, with the two light targets coinciding with the actual centers of the front and rear ends of the stern tube.

[0010] Step 5: Erect a central illumination target at the front of the ship's main engine base according to the theoretical center of the shaft system;

[0011] Step 6: Draw the cross lines of the central illumination target and the intermediate target according to the theoretical center line of the ship's hull;

[0012] Step 7: Place the laser device on the centerline of the hull behind the bow section;

[0013] Step 8: Adjust the laser instrument so that the light spot coincides with the center of the central illumination target and the center of the intermediate target;

[0014] Step 9: Adjust the bow section so that the center lines of the two illumination targets, the central illumination target, and the intermediate target are aligned with the same straight line.

[0015] Step 10: Secure the bow section using a comb-shaped adjustment bracket and constraint welding;

[0016] Step 11: Loosen the hook and recheck the status of the two illumination targets and the center line of the central illumination target and the intermediate target;

[0017] Step 12: Weld the bow section according to the welding process;

[0018] Step 13: When welding the bow section, adjust the laser instrument to ensure that the beam always passes through the center of the two illumination targets, and record the deviation data of the center illumination target, the intermediate target and the beam in the table every two hours, and correct the welding sequence in time.

[0019] Step fourteen: After the bow section is welded, measure again the distance from the rear end face of the stern tube to the intermediate target and the deviation between the actual center line of the stern tube and the hull baseline.

[0020] As a preferred technical solution, in step three, the error between the allowance line and the actual cutting allowance is detected, and the error range is within ±3mm.

[0021] As a preferred technical solution, before welding the bow section in step twelf, the bow section is hoisted and positioned so that the illumination target at the front end of the stern tube is 10-12mm lower than the first crosshair target, which serves as the welding anti-deformation amount.

[0022] As a preferred technical solution, in step twelfth, the welding bow section adopts CO2 automatic single-sided welding process and a step-back welding method, and the bevel form at the large joint of the outer plate is CO2 single-sided bevel.

[0023] As a preferred technical solution, in step twelf, the welding process is as follows: when the middle section is welded to half the plate thickness, welding is paused and the weld is measured once after it cools down. After ensuring that the center of the stern tube meets the requirements, the subsequent welds are welded in the welding sequence. After each layer is welded, a measurement is taken. If the center deviation of the stern tube exceeds the specified range, welding is carried out in the opposite direction, and welding on the other side is paused until the center deviation is corrected, and welding on both sides continues simultaneously.

[0024] As a preferred technical solution, in step thirteen, the welding sequence is to weld the outer plate butt joint first, and then weld the other joints; when welding the outer plate, an even number of welders are arranged to weld symmetrically at the same time, and the welding sequence, number of welding layers, weld length and welding specifications on both sides of the outer plate are the same, and the thickness of each weld layer is controlled at 3 to 4 mm; electric welding is carried out according to the outer plate welding process sequence.

[0025] As a preferred technical solution, in step thirteen, the data of the bow section recording table is measured and recorded by a designated person, with the light spot being positive on the left, negative on the right, positive at the top, and negative at the bottom.

[0026] As a preferred technical solution, the intermediate target has a Φ50mm hole at the theoretical axis center height.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] (1) The present invention provides a method for controlling the accuracy of shafting section boring after single-propeller single-rudder stern engine type ship, which can accurately and quickly determine the shafting section deviation accuracy;

[0029] (2) The present invention provides a method for controlling the accuracy of shafting section boring of a single-propeller, single-rudder stern engine ship after installation, which facilitates on-site construction personnel to directly read data for accuracy adjustment during the process;

[0030] (3) The present invention provides a method for controlling the accuracy of shafting section boring and mounting of a single-propeller, single-rudder stern engine type ship, which reduces the time consumption of the dock assembly stage and achieves the goal of moving the process forward, reducing costs and increasing efficiency. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the target installation in a precision control method for shafting sections of a single-propeller, single-rudder stern engine ship according to the present invention.

[0032] Figure 2 This is a schematic diagram of the welding sequence in a method for controlling the accuracy of shafting after boring in sections of a single-propeller, single-rudder stern engine type ship, according to the present invention.

[0033] Figure 3 This is a record sheet used in the present invention for the accuracy control method of shafting section boring after mounting on a single-propeller, single-rudder stern engine type ship.

[0034] In the diagram: 1. Bottom front section; 2. Bottom rear section; 3. Bow section; 4. Middle first section; 5. Middle second section; 6. Triangle plate; 7. Middle target; 8. Front illumination target; 9. Rear illumination target; 10. Center illumination target; 11. Laser. Detailed Implementation

[0035] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0036] like Figure 1 As shown, a method for controlling the accuracy of shafting section boring and mounting on a single-propeller, single-rudder stern engine type ship is disclosed. The ship includes a bottom forward section 1, a bottom aft section 2, a bow section 3, a first intermediate section 4, and a second intermediate section 5. The method includes the following steps:

[0037] Step 1: Weld a triangular plate 6 to the center line of the inner bottom plate of the front section 1 at the bottom. In this embodiment, the triangular plate 6 is a triangular iron block with dimensions of 300mm×300mm×12mm.

[0038] Step two: An intermediate target 7 is erected on the inner bottom plate at the first bolt hole of the main engine towards the first strong stop at the stern, according to the hull centerline. The intermediate target 7 has a Φ50mm hole at the theoretical shaft center height. The distance from the joint between the bow section 3 and the bottom forward section 1 to the intermediate target 7 is measured. This distance is determined based on the length of the stern tube after boring and the weld shrinkage. This step is to determine the cutting allowance for the first intermediate section 4.

[0039] Step 3: Mark the allowance line on the first middle segment 4 and cut the allowance when the bow segment 3 is installed. After the bow segment 3 is positioned, detect and record the error between the allowance line and the actual cutting allowance. The error range is within ±3mm.

[0040] Step 4: Install a light target 8 and a light target 9 on the front and rear ends of the stern tube, respectively, with the two light targets 8 and 9 coinciding with the actual centers of the front and rear ends of the stern tube.

[0041] Step 5: Erect a central illumination target 10 at the front of the ship's main engine base according to the theoretical center of the shaft system;

[0042] Step 6: Draw the cross lines of the central illumination target 10 and the intermediate target 7 according to the theoretical center line of the ship's hull;

[0043] Step 7: Place laser device 11 on the centerline of the hull behind bow section 3;

[0044] Step 8: Adjust the laser instrument 11 so that the light spot coincides with the center of the central illumination target 10 and the center target 7;

[0045] Step 9: Adjust the bow section 3 so that the center lines of the two illumination targets 8 and 9 are aligned with the center illumination target 10 and the intermediate target 7.

[0046] Step 10: Fix the bow section 3 using the comb horse adjustment bracket and constraint welding;

[0047] Step 11: Loosen the hook and recheck the status of the center lines of the two illumination targets 8 and 9, the central illumination target 10, and the intermediate target 7.

[0048] Step 12: Hoist and position the bow section 3, ensuring the illumination target at the front of the stern tube is 10-12mm lower than the first crosshair target. This serves as the welding anti-deformation allowance, derived from experience in civilian shipbuilding. After installation, control the joint gap within the specified range. During section positioning and assembly, the management department is responsible for real-time monitoring, while the workshop is responsible for measurement. Weld the bow section 3 according to the welding process, using CO2 automatic single-sided welding with a step-back welding method. The beveling at the large joint of the outer plate is a CO2 single-sided beveling. The welding process is as follows: When welding ① to half the plate thickness, pause welding and measure once after the weld cools. After ensuring the stern tube center meets the requirements, continue welding subsequent welds ② and ③ in the welding sequence. Measure once after each layer of welding. If the stern tube center deviation exceeds the specified range, weld in the opposite direction, pausing welding on the other side until the center deviation is corrected, then both sides can continue welding simultaneously.

[0049] Step 13: When welding the bow section 3, adjust the laser instrument 11 so that the beam always passes through the center of the two illumination targets 8 and 9, and record the deviation data between the central illumination target 10, the intermediate target 7 and the beam in the record table of the bow section 3 every two hours, and correct the welding sequence in time.

[0050] like Figure 2 As shown, the welding sequence is to weld the butt joints of the outer plates first, and then weld the other joints. When welding the outer plates, an even number of welders are arranged to weld symmetrically at the same time. The welding sequence, number of welding layers, weld length and welding specifications are the same on both sides of the outer plates. The thickness of each weld layer is controlled at 3-4mm. Welding is carried out in accordance with the welding process sequence of the outer plates.

[0051] like Figure 3 As shown, the data in the recording table of section 3 of the bow is measured and recorded by a designated person. The light spot is positive when it is on the left, negative when it is on the right, positive when it is above, and negative when it is below.

[0052] Step fourteen: After the bow section 3 is welded, measure again the distance from the rear end face of the stern tube to the intermediate target 7 and the deviation between the actual center line of the stern tube and the hull baseline.

[0053] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for controlling the mounting accuracy of shafting sections after boring in a single-propeller, single-rudder, stern engine type vessel, the vessel comprising a bow section, a bow section, a first intermediate section, and a second intermediate section, characterized in that, The method includes the following steps: Step 1: Weld a triangular plate to the center line of the inner bottom plate at the front of the bottom segment; Step 2: Erect an intermediate target on the inner bottom plate at the first bolt hole of the main engine of the ship, towards the first strong stop at the stern end, according to the center line of the hull, and measure the distance from the joint between the bow section and the bottom front section to the intermediate target. Step 3: Mark the allowance line on the first middle segment and cut the allowance when the bow segment is installed. After the bow segment is positioned, detect and record the error between the allowance line and the actual cut allowance. Step 4: Install a light target on the front and rear end faces of the stern tube, with the two light targets coinciding with the actual centers of the front and rear end faces of the stern tube; Step 5: Erect a central illumination target at the front of the ship's main engine base according to the theoretical center of the shaft system; Step 6: Draw the cross lines of the central illumination target and the intermediate target according to the theoretical center line of the ship's hull; Step 7: Place a laser device on the hull centerline behind the bow section; Step 8: Adjust the laser instrument so that the light spot coincides with the center of the central illumination target and the center of the intermediate target; Step 9: Adjust the bow section so that the center lines of the two illumination targets, the central illumination target, and the intermediate target are aligned with the same straight line. Step 10: The bow section is fixed using a comb-horse adjustment bracket and constraint welding; Step 11: Loosen the hook and recheck the status of the two illumination targets and the center line of the central illumination target and the intermediate target; Step 12: Weld the bow section according to the welding process; Step 13: When welding the bow section, adjust the laser instrument to ensure that the beam always passes through the center of the two illumination targets, and record the deviation data of the center illumination target, the intermediate target and the beam in the table every two hours, and correct the welding sequence in time. Step fourteen: After the bow section is welded, measure again the distance from the rear end face of the stern tube to the intermediate target and the deviation between the actual center line of the stern tube and the baseline of the hull.

2. The method for controlling the mounting accuracy of shafting sections after boring for a single-propeller, single-rudder stern engine type ship according to claim 1, characterized in that, In step three, the error between the detection allowance line and the actual cutting allowance is within ±3mm.

3. According to claim 1, the method for controlling the mounting accuracy of the shafting section after boring of a single-propeller, single-rudder stern engine type ship, before welding the bow section in step twelf, the bow section is hoisted and positioned so that the illumination target at the front end of the stern shaft tube is 10-12mm lower than the first crosshair target, as the welding anti-deformation amount.

4. The method for controlling the mounting accuracy of shafting sections after boring for a single-propeller, single-rudder stern engine type ship according to claim 1, characterized in that, In step twelf, the bow section is welded using an automatic CO2 single-sided welding process and a step-back welding method. The bevel at the large joint of the outer plate is a CO2 single-sided bevel.

5. The method for controlling the mounting accuracy of shafting sections after boring for a single-propeller, single-rudder stern engine type ship according to claim 1, characterized in that, In step twelf, the welding process is as follows: when the middle section is welded to half the plate thickness, welding is paused and the weld is measured once after it cools down. After ensuring that the center of the stern tube meets the requirements, the subsequent welds are welded in the welding sequence. After each layer is welded, a measurement is taken. If the center deviation of the stern tube exceeds the specified range, welding is carried out in the opposite direction, and welding on the other side is paused until the center deviation is corrected, and welding on both sides continues simultaneously.

6. The method for controlling the mounting accuracy of shafting sections after boring for a single-propeller, single-rudder stern engine type ship according to claim 1, characterized in that, In step thirteen, the welding sequence is to weld the outer plate butt joints first, and then weld the other joints. When welding the outer plate, an even number of welders are arranged to weld symmetrically at the same time. The welding sequence, number of welding layers, weld length, and welding specifications are the same on both sides of the outer plate. The thickness of each weld layer is controlled at 3-4 mm. Welding is carried out in accordance with the outer plate welding process sequence.

7. The method for controlling the mounting accuracy of shafting sections after boring for a single-propeller, single-rudder stern engine type ship according to claim 1, characterized in that, In step thirteen, the data of the bow section is measured and recorded by a designated person. The light spot is positive when it is on the left, negative when it is on the right, positive when it is above, and negative when it is below.

8. The method for controlling the mounting accuracy of shafting sections after boring for a single-propeller, single-rudder stern engine type ship according to claim 1, characterized in that, The intermediate target has a Φ50mm hole at the theoretical axis center height.

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