Method for controlling carrying precision after segmented boring of shafting of single-propeller single-rudder stern type ship

Abstract

The invention relates to a carrying precision control method for a single-propeller single-rudder stern type ship shafting after segmented boring. The carrying precision control method comprises the following steps: welding a triangular plate; a middle target is erected, and the distance between a joint of the bow section and the bottom front side section and the middle target is measured; marking a margin line of a first middle segment, marking the margin line, and detecting and recording a margin line error; irradiation targets are respectively mounted on the front and rear end surfaces of the stern shaft tube; erecting a central irradiation target; drawing a cross curve of the central irradiation target and the middle target; a laser instrument is placed and adjusted; adjusting the bow section to align the four targets; adjusting the bracket and fixing; loosening the lifting hook, and rechecking; the bow section is welded, and the welding sequence is recorded and corrected; and 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 the ship base line. According to the method, the shafting segmentation deviation precision can be accurately and rapidly judged, site constructors can conveniently and directly read data for precision adjustment in the process, the labor hour consumption in the dock total assembly carrying stage is reduced, and the aims of working procedure forward movement, cost reduction and efficiency improvement are achieved.

Description

Technical Field

[0001] The invention relates to the field of shipbuilding, and in particular to a method for controlling the mounting accuracy after segmented boring of a shaft system of a single-propeller, single-rudder, stern-engine ship. Background Art

[0002] With the continuous advancement of refined construction, the accuracy requirements of shaft and rudder system sections are also constantly increasing during the ship construction process. In the traditional shaft system section installation, the accuracy error of the poor concentricity of the shaft system and the rudder system must be within 2mm, and the concentricity of the shaft and rudder system sections must be within 2mm after completion. After the shaft and rudder system sections are installed, the shaft and rudder system are bored to ensure the concentricity of the sections. This method seriously affects the working hours consumed during the installation operation, and the construction area is narrow during the boring operation, and the construction environment is extremely harsh, making it difficult to guarantee the construction quality and the health of the construction workers. Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a method for controlling the loading accuracy of the shaft system of a single-propeller and single-rudder stern-type ship after segmented boring, which can accurately and quickly determine the segmented deviation accuracy of the shaft system and reduce the man-hour consumption in the dock assembly loading stage.

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

[0005] A method for controlling the post-loading accuracy of segmented boring of a shaft system of a single-propeller single-rudder stern-type ship, wherein the ship comprises a bottom front segment, a bottom rear segment, a bow segment, a first middle segment and a second middle segment, and the method comprises the following steps:

[0006] Step 1: weld a triangular plate at the center line of the inner bottom plate at the stern end of the bottom front section;

[0007] Step 2: erect an intermediate target on the inner bottom plate at the first strong position of the first bolt hole of the main engine of the ship toward 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;

[0008] Step 3: Mark the margin of the first middle section and make a mark, and cut the margin when the bow section is loaded. After the bow section is positioned, detect and record the error between the margin line and the actual cutting margin;

[0009] Step 4: installing a lighting target on the front and rear end surfaces of the stern tube respectively, and the two lighting targets coincide with the actual centers of the front and rear end surfaces of the stern tube;

[0010] Step 5, erecting a central illumination target at the front of the main engine base of the ship 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 centerline of the hull;

[0012] Step 7: Place a laser 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 two illumination targets are in the same straight line with the center line of the central illumination target and the intermediate target;

[0015] Step 10, fix the bow section with a combing horse adjustment bracket and restraint 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, welding the bow section according to the welding process;

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

[0019] Step 14: After the bow sections are welded, measure again 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 the baseline of the hull.

[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 between ±3mm.

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

[0022] As a preferred technical solution, in step twelve, the CO2 automatic single-sided welding process is used to weld the bow sections, and a step-by-step welding method is used. The groove form at the large seam of the outer plate is a CO2 single-sided groove.

[0023] As a preferred technical solution, in step twelve, the welding process is: when the middle welding reaches half the plate thickness, the welding is suspended, and the weld is measured once after cooling. After ensuring that the center of the stern tube meets the requirements, the subsequent welds are welded in the welding sequence, and each layer is measured once after welding. If the center deviation of the stern tube exceeds the specified range, welding is carried out in the opposite direction, and the welding on the other side is suspended until the center deviation is corrected, and then both sides continue to be welded simultaneously.

[0024] As a preferred technical solution, in step thirteen, the welding sequence is to weld the outer plate butt joints first, and then weld other joints; when welding the outer plate, arrange an even number of welders to weld symmetrically and simultaneously, 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 layer of weld 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, a dedicated person measures and records the data in the record sheet of the bow section, and the light spot is positive on the left, negative on the right, positive on the top, and negative on the bottom.

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

[0027] Compared with the prior art, the present invention has the following beneficial effects:

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

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

[0030] (3) The method for controlling the precision of the post-loading after the segmented boring of the shaft system of a single-propeller, single-rudder stern-type ship of the present invention reduces the man-hour consumption in the loading stage of the overall assembly at the dock, and achieves the goal of moving the process forward and reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the installation of a target in a method for carrying precision control after segmented boring of a shaft system of a single-propeller, single-rudder stern aircraft type ship of the present invention;

[0032] Figure 2 It is a schematic diagram of the welding sequence in a method for controlling the post-mounting precision of the shaft system of a single-propeller, single-rudder stern aircraft ship after segmented boring according to the present invention;

[0033] Figure 3 The invention discloses a record table in a method for controlling the post-mounting precision of a shaft system of a single-propeller single-rudder stern type ship after segmented boring.

[0034] In the figure, 1. bottom front section; 2. bottom rear section; 3. bow section; 4. first middle section; 5. second middle section; 6. triangle plate; 7. middle target; 8. front lighting target; 9. rear lighting target; 10. center lighting target; 11. laser instrument. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below in conjunction with specific implementation methods:

[0036] like Figure 1 As shown, a method for controlling the post-loading precision of the segmented boring of the shaft system of a single-propeller single-rudder stern-type ship is provided, wherein the ship comprises a bottom front segment 1, a bottom rear segment 2, a bow segment 3, a middle first segment 4 and a middle second segment 5, and the method comprises the following steps:

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

[0038] Step 2: erect an intermediate target 7 on the inner bottom plate at the first strong position of the stern end from the first bolt hole of the main engine of the ship according to the center line of the hull. The intermediate target 7 is provided with a Φ50mm hole at the height of the theoretical shaft center. Measure the distance from the joint between the bow section 3 and the bottom front section 1 to the intermediate target 7. The distance is determined according to the length of the stern tube after boring and the shrinkage of the weld. This step is to determine the cutting allowance of the first middle section 4;

[0039] Step 3: Mark the margin of the first middle section 4 and make a mark. When the bow section 3 is loaded, cut the margin. After the bow section 3 is positioned, detect and record the error between the margin line and the actual cutting margin. The error range is between ±3mm.

[0040] Step 4: Install a lighting target 8, 9 on the front and rear end surfaces of the stern tube respectively, and the two lighting targets 8, 9 coincide with the actual centers of the front and rear end surfaces of the stern tube;

[0041] Step 5, erecting a central illumination target 10 at the front of the main engine base of the ship 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 hull;

[0043] Step 7, placing a laser instrument 11 on the centerline of the hull behind the bow section 3;

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

[0045] Step nine, adjusting the bow section 3 so that the two illumination targets 8, 9 are in the same straight line with the center line of the central illumination target 10 and the intermediate target 7;

[0046] Step 10, fix the bow section 3 with a combing horse adjustment bracket and restraint welding;

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

[0048] Step 12, hoist and position the bow section 3, so that the illumination target at the front end of the stern tube is 10-12mm lower than the first cross-line target, as the welding reverse deformation, which is obtained by referring to the experience of civil ship construction; after loading, control the joint gap within the specified control range; during the segment positioning and assembly, the management department is responsible for real-time monitoring, and the workshop is responsible for measurement. The bow section 3 is welded according to the welding process, and the CO2 automatic single-sided welding process is adopted for welding, and the gradual back-welding method is adopted. The groove form at the large seam of the outer plate is the CO2 single-sided groove. The welding process is: when No. ① is welded to half the plate thickness, the welding is suspended, and the weld is measured once after cooling. After ensuring that the center of the stern tube meets the requirements, the subsequent welds ② and ③ are welded in the welding order, and each layer is measured once after welding. If the center deviation of the stern tube exceeds the specified range, it is welded in the opposite direction, and the welding on the other side is suspended until the center deviation is corrected, and then both sides can continue to weld simultaneously.

[0049] Step 13: When welding the bow section 3, adjust the laser instrument 11 so that the light beam always passes through the center of the two illumination targets 8 and 9, and record the deviation data of the center illumination target 10, the intermediate target 7 and the light 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 outer plate butt joints first, and then weld other joints; when welding the outer plate, arrange an even number of welders to weld symmetrically and simultaneously, 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 layer of weld is controlled at 3 to 4 mm; electric welding is carried out according to the outer plate welding process sequence.

[0051] like Figure 3 As shown, the record sheet of bow section 3 is measured and recorded by a dedicated person. The light spot is positive on the left, negative on the right, positive on the top, and negative on the bottom.

[0052] Step 14: After the bow section 3 is welded, 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 are measured again.

[0053] This embodiment is only a further explanation of the present invention, not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it will be protected by the patent law.

Claims

1. A method for controlling the post-loading precision of the segmented boring of the shaft system of a single-propeller single-rudder stern-type ship, wherein the ship comprises a bottom front segment, a bottom rear segment, a bow segment, a first middle segment and a second middle segment, characterized in that: The method comprises the following steps: Step 1: weld a triangular plate at the center line of the inner bottom plate at the stern end of the bottom front section; Step 2: erect an intermediate target on the inner bottom plate at the first strong position of the first bolt hole of the main engine of the ship toward 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 margin of the first middle section and make a mark, and cut the margin when the bow section is loaded. After the bow section is positioned, detect and record the error between the margin line and the actual cutting margin; Step 4: installing a lighting target on the front and rear end surfaces of the stern tube respectively, and the two lighting targets coincide with the actual centers of the front and rear end surfaces of the stern tube; Step 5, erecting a central illumination target at the front of the main engine base of the ship 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 centerline of the hull; Step 7, placing a laser instrument on the centerline of the hull 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 nine, adjusting the bow section so that the two illumination targets are in the same straight line with the center lines of the central illumination target and the intermediate target; Step ten, fixing the bow section with a combing horse adjustment bracket and restraint 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, welding the bow section according to the welding process; Step 13: When welding the bow section, adjust the laser instrument so that the light beam always passes through the center of the two illumination targets, and record the deviation data of the center illumination target, the middle target and the light beam in the table every two hours, and correct the welding sequence in time; Step 14: After the bow sections are welded, 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 are measured again.

2. The method for controlling the post-loading precision of the segmented boring of the shaft system of a single-propeller, single-rudder stern-type ship according to claim 1 is characterized in that: In step three, the error between the detection margin line and the actual cutting margin has an error range of ±3 mm.

3. According to the method for precision control after segmented boring of the shaft system of a single-propeller, single-rudder stern-type ship as described in claim 1, before welding the bow segment in step 12, the bow segment is hoisted and positioned so that the lighting target at the front end of the stern tube is 10 to 12 mm lower than the first cross-line target as the welding reverse deformation amount.

4. The method for controlling the post-loading precision of the segmented boring of the shaft system of a single-propeller, single-rudder stern-type ship according to claim 1 is characterized in that: In step twelve, the CO2 automatic single-sided welding process is used to weld the bow sections, and a step-by-step welding method is used. The groove form at the large seam of the outer plate is a CO2 single-sided groove.

5. The method for controlling the post-loading precision of the segmented boring of the shaft system of a single-propeller single-rudder stern-type ship according to claim 1 is characterized in that: In the step twelve, the welding process is as follows: when the middle welding reaches half the plate thickness, the welding is suspended, and the weld is measured once after cooling. After ensuring that the center of the stern tube meets the requirements, the subsequent welds are welded in the welding sequence, and each layer is measured once after welding. If the center deviation of the stern tube exceeds the specified range, welding is performed in the opposite direction, and the welding on the other side is suspended until the center deviation is corrected, and then the two sides continue to be welded simultaneously.

6. The method for controlling the post-loading precision of the segmented boring of the shaft system of a single-propeller single-rudder stern-type ship according to claim 1 is characterized in that: In the step thirteen, the welding sequence is to weld the outer plate butt joints first, and then weld other joints; when welding the outer plate, arrange an even number of welders to weld symmetrically and simultaneously, 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 layer of weld is controlled at 3 to 4 mm; electric welding is performed according to the outer plate welding process sequence.

7. The method for controlling the post-loading precision of the segmented boring of the shaft system of a single-propeller, single-rudder stern-type ship according to claim 1 is characterized in that: In the step thirteen, a dedicated person measures and records the data in the record sheet of the bow section, and the light spot is positive on the left, negative on the right, positive on the top, and negative on the bottom.

8. The method for controlling the post-loading precision of the segmented boring of the shaft system of a single-propeller, single-rudder stern-type ship according to claim 1 is characterized in that: The intermediate target is provided with a Φ50mm hole at the theoretical axis center height.

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