Ship shafting alignment inspection method

Abstract

The invention discloses a ship shafting alignment inspection method, which belongs to the technical field of ship construction process, aims at alignment inspection of ship shafting, and comprises the following steps of: 1, supporting an intermediate shaft by using an adjustable carrier roller, and aligning a tail shaft and a crankshaft; 2, a positioning bolt pre-tightens the intermediate shaft and the crankshaft flange to realize preliminary centering; 3, jacking adjusting devices which are in diagonal symmetry are installed in preset bolt holes of the crankshaft flange; 4, fixing a dial indicator through an angle steel bracket, and setting a zero position by taking a crankshaft flange as a reference; 5, the turning gear drives the shaft to rotate, and the reading of the dial indicator is recorded; 6, adjusting a jacking bolt according to the reading, so that the radial deviation of the flange is less than or equal to 0.03 mm; 7.0.03 mm feeler gauge verifies that the flange is attached, and then the positioning bolt is fastened. The problems that traditional alignment adjustment is tedious and measurement has a blind area are solved, the ship shafting alignment inspection method which is easy and convenient to operate, accurate in adjustment, reliable in measurement and higher in efficiency is provided, and the classification society inspection standard is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shipbuilding process, in particular to a ship shafting alignment inspection method. BACKGROUND

[0002] The ship shafting is the core component of the ship propulsion system, which includes key components such as the stern shaft, the intermediate shaft and the main engine crankshaft. The shafting alignment accuracy directly affects the safety, stability and propulsion efficiency of the ship. Among them, the flange alignment of the intermediate shaft, the main engine crankshaft and the stern shaft is the core process of shafting installation. The process requires that the offset and tortuosity of the two flanges be ≤0.03mm, and the flange contact surface needs to be in close contact, and a 0.03mm feeler gauge cannot be inserted, which provides a basis for subsequent shafting boring, bolt installation and main engine epoxy pouring processes.

[0003] However, the existing ship shafting alignment inspection technology has many problems to be solved:

[0004] 1. The adjustment operation is tedious and laborious. The traditional alignment relies on the flat shaft bracket supporting the intermediate shaft for repeated adjustment up and down and left and right. The bracket adjustment bolts are mostly fine teeth, and the weight of the intermediate shaft can reach tens of tons, resulting in a labor intensity of one day for single flat shaft adjustment. After the temporary bolt is tightened, the two flanges are prone to displacement, and repeated adjustment is required, further increasing the workload.

[0005] 2. The measurement method has limitations. The traditional feeler gauge detection method is used to detect the flange contact, but some ship classification societies do not accept the feeler gauge measurement method, and prefer the accuracy of the dial gauge measurement. At the same time, since the stern shaft and the intermediate shaft cannot be rotated in the unconnected state, the existing dial gauge rotation measurement method cannot effectively detect the alignment accuracy of the intermediate shaft and the stern shaft flanges, and there is a measurement blind area.

[0006] Therefore, it is necessary to provide a ship shafting alignment inspection method to solve the above technical problems. SUMMARY

[0007] The purpose of the present application is to overcome the shortcomings of the prior art and provide a ship shafting alignment inspection method that is simple to operate, accurate to adjust, reliable to measure and more efficient.

[0008] To achieve the above purpose, the technical scheme adopted by the present application is:

[0009] A ship shafting alignment inspection method, the ship shafting includes a stern shaft, an intermediate shaft and a main engine crankshaft, comprising the following steps:

[0010] Step 1, intermediate shaft hoisting: hoist the intermediate shaft onto the ship, support the two ends of the intermediate shaft by two adjustable rollers, adjust the two adjustable rollers, and align the two ends of the intermediate shaft with the stern shaft and the crankshaft respectively;

[0011] Step 2, preparation for alignment: the pre-drilled holes of the intermediate shaft flange end face and the pre-drilled holes of the crankshaft flange end face are one-to-one corresponding, the positioning bolts are inserted and pre-tightened, the positioning bolts are left with a rotation allowance, the two flange end faces are preliminarily attached and a fine adjustment space is reserved, and the preliminary alignment is completed;

[0012] Step 3, installation of correction tooling: the edge of the crankshaft flange end face is uniformly ringed with four preset bolt holes, the preset threaded holes are provided with lifting adjustment devices, the four lifting adjustment devices are diagonally and symmetrically arranged, the lifting adjustment device comprises a mounting seat, the rear end of the mounting seat is fixedly connected with the preset bolt hole through screwing, the inside of the mounting seat is provided with a lifting bolt penetratingly screwed, the lifting bolt is arranged radially along the crankshaft flange end face, the bottom end of the lifting bolt is fixedly connected with an arc crescent plate, and the arc crescent plate is attached to the outer periphery of the intermediate shaft flange.

[0013] Step 4, arrangement of detection tooling: the corresponding dial gauge assemblies are installed on the intermediate shaft flange in the circumferential direction, the dial gauge assembly comprises a dial gauge for detecting the radial offset, the dial gauge is fixed to the angle steel support through a magnetic force table seat, the contact of the dial gauge is in sliding contact with the outer circumferential surface of the intermediate shaft flange end, the crankshaft flange is selected as the reference, the center line of the dial gauge contact is perpendicular to the axis of the crankshaft flange, and the 0 reference of the dial gauge is confirmed.

[0014] Step 5, turning detection: the main engine crankshaft is driven to rotate through the turning machine, and the intermediate shaft is synchronously driven to rotate, and the reading fluctuation of the dial gauge on the intermediate shaft flange in the circumferential direction is recorded.

[0015] Step 6, accurate adjustment: the high point position of the intermediate shaft flange is determined according to the dial gauge reading fluctuation, the corresponding lifting bolt displacement arc crescent plate is adjusted, the arc crescent plate acts on the outer periphery of the intermediate shaft flange, the position of the intermediate shaft flange is fine adjusted, steps 5 to 6 are repeated, and the radial offset of the intermediate shaft flange and the crankshaft flange is less than or equal to 0.03mm.

[0016] Step 7, qualified verification: the 0.03mm feeler gauge is used to detect the attachment surface of the two flanges, after confirming that the feeler gauge cannot be inserted, the positioning bolt is tightened and is marked, and the shafting alignment inspection is completed.

[0017] Preferably, the fine adjustment of the intermediate shaft flange in step 6 includes that if the high point position is directly opposite the lifting adjustment device, the corresponding side lifting bolt is adjusted alone, and if the high point is located between the two lifting adjustment devices, the lifting bolts on the adjacent two sides are synchronously adjusted.

[0018] Preferably, the adjustable supporting roller in step 1 comprises a base and a roller shaft seat, the roller shaft seat and the base are connected through a nut and a screw rod, the height of the roller shaft seat is adjusted, a group of roller shafts for supporting the bottom of the intermediate shaft are installed on the top surface of the roller shaft seat, and the axis of the roller shaft is parallel to the axis of the intermediate shaft.

[0019] Preferably, the roller shaft is a copper roller shaft.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. Existing technology relies on repeated adjustments using fine-threaded bolts on the flat shaft bracket, requiring one day for a single alignment and involving high labor intensity. This invention uses adjustable rollers for initial alignment and four sets of diagonal lifting adjustment devices to precisely act on the intermediate shaft flange, combined with targeted adjustment logic, reducing the alignment time to 2-3 hours per alignment, resulting in high adjustment efficiency and significantly reducing repetitive operations and labor.

[0022] 2. Existing technologies have measurement blind spots because the intermediate shaft cannot rotate. This invention uses a turning machine to drive the shaft system to rotate synchronously, and a dial indicator uses the crankshaft flange as a reference for detection, thus eliminating the detection blind spot. The dial indicator monitors radial offset in real time, improving the alignment accuracy. Attached Figure Description

[0023] Fig. 1 This is a schematic diagram of the intermediate shaft hoisting;

[0024] Fig. 2 This is a schematic diagram of an adjustable idler roller supporting an intermediate shaft;

[0025] Fig. 3 This is a schematic diagram of a dial indicator measuring the outer circumference of the intermediate shaft flange;

[0026] Among them, 1-stern shaft, 2-intermediate shaft, 3-adjustable idler roller, 301-base, 302-roller seat, 303-roller, 4-intermediate shaft flange, 5-crankshaft flange, 6-positioning bolt, 7-lifting adjustment device, 701-mounting seat, 702-lifting bolt, 703-arc crescent plate, 8-dial indicator Detailed Implementation

[0027] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and not for limiting the scope of the invention. After reading this invention, any modifications of the invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixed connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements of this invention, and do not specifically refer to any component or element in this invention, and should not be construed as limiting this invention.

[0030] like Figs. 1 to 3 As shown, a method for aligning and inspecting a ship's shafting system, the ship's shafting system including a stern shaft 1, an intermediate shaft 2, and a main engine crankshaft, includes the following steps:

[0031] Step 1, Intermediate Shaft Lifting: Lift the intermediate shaft 2 to the designated installation position in the ship's engine room, ensuring that the intermediate shaft axis is approximately parallel to the stern shaft and main engine crankshaft axes. Both ends of the intermediate shaft are supported by two adjustable rollers 3. Each adjustable roller includes a base 301 and a roller seat 302. The roller seat and base are connected by a nut and a lead screw. The height of the roller seat is adjusted by rotating the lead screw, ensuring that a set of copper rollers 303 on the top surface of the roller seat are tightly fitted to the bottom of the intermediate shaft, and that the roller axis remains parallel to the intermediate shaft axis. Using a level and laser alignment instrument for auxiliary measurement, gradually adjust the height and horizontal position of the two adjustable rollers to align both ends of the intermediate shaft with the center axes of the stern shaft flange and crankshaft flange, respectively, completing the initial positioning.

[0032] Step 2, Alignment Preparation: Clean the oil, rust, and other impurities from the end faces of the intermediate shaft flange 4 and crankshaft flange 5 to ensure the mating surfaces are flat and free of debris. Align the pre-drilled holes on the end faces of the intermediate shaft flange and crankshaft flange one by one, insert the positioning bolts 6 and pre-tighten them, leaving some allowance for screwing in the positioning bolts. This allows the two flange end faces to initially fit together while retaining room for fine-tuning, completing the initial alignment.

[0033] Step 3: Install the alignment fixture: Install the lifting adjustment device 7 at four pre-set bolt holes evenly distributed around the edge of the crankshaft flange end face. The four lifting adjustment devices are arranged diagonally symmetrically. The lifting adjustment device includes a mounting base 701. The rear end of the mounting base has an external thread that matches the pre-set bolt holes. The mounting base is screwed and fixed into the pre-set bolt holes. The mounting base has a through-bolt 702 inside. The lifting bolt is set radially along the crankshaft flange end face. The bottom end of the lifting bolt is fixed to an arc-shaped crescent plate 703 by welding. The curvature of the arc-shaped crescent plate is consistent with the outer circumferential curvature of the intermediate shaft flange. The arc-shaped crescent plate is fitted to the outer circumferential surface of the intermediate shaft flange.

[0034] Step 4: Arrange the testing fixture: Arrange a set of dial indicator components around the intermediate shaft flange. The dial indicator component includes dial indicator 8 for detecting radial offset. The dial indicator is fixed to the angle steel bracket by a magnetic base. The angle steel bracket is welded and fixed to the ground next to the main unit. Slide the dial indicator contact with the outer circumferential surface of the intermediate shaft flange end. Select the crankshaft flange as the reference and calibrate it with a laser alignment instrument so that the center line of the dial indicator contact is perpendicular to the axis of the crankshaft flange. Then zero the dial indicator and confirm that the 0 position reference is correct.

[0035] Step 5, Turning Gear Inspection: Start the turning gear machine, which drives the main crankshaft to rotate at a constant speed of 5 r / min. During the crankshaft rotation, the intermediate shaft rotates synchronously. During one revolution of the intermediate shaft flange, record the dial indicator reading every 45°, for a total of 8 sets of data. Record the fluctuation of the dial indicator value at each measuring point, plot the reading fluctuation curve, and determine the high point position and numerical deviation of the intermediate shaft flange.

[0036] Step 6, Precise Adjustment:

[0037] Determine the high point position of the intermediate shaft flange based on the dial indicator reading fluctuation curve:

[0038] If the high point is directly opposite a certain lifting adjustment device, rotate the lifting bolt on the corresponding side separately to drive the arc-shaped crescent plate to move radially, finely adjust the position of the intermediate shaft flange, and repeat the turning test in step 5 after adjustment, and record the reading changes.

[0039] If the high point is located between the two lifting adjustment devices, rotate the lifting bolts on the adjacent sides and simultaneously fine-tune the position of the intermediate shaft flange. After adjustment, repeat the turning test in step 5.

[0040] Repeat steps 5 to 6 until the radial offset of the intermediate shaft flange and crankshaft flange recorded by the dial indicator is ≤0.03mm.

[0041] Step 7, Qualification Verification: Use a 0.03mm feeler gauge to perform a comprehensive inspection of the mating surfaces of the two flanges. Try inserting the feeler gauge between the two flange mating surfaces. Once it is confirmed that the feeler gauge cannot be inserted at any of the inspection points, it indicates that the two flange mating surfaces are in tight contact. Then, gradually tighten the positioning bolts, and mark the corresponding positions on the positioning bolts and flange end faces to complete the shaft alignment inspection.

[0042] Using the method in this embodiment, the time required for a single shaft alignment inspection is only 2.5 hours, which is significantly improved compared to the 1 day required by the traditional method. Furthermore, the final test results show that the radial offset of the two flanges is 0.02 mm and the tortuosity is 0.015 mm, both of which meet the process requirement of ≤0.03 mm. The alignment accuracy is significantly improved and fully complies with the inspection standards of the classification society.

[0043] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A method for aligning and inspecting a ship's shafting system, wherein the ship's shafting system includes a stern shaft, an intermediate shaft, and a main engine crankshaft, characterized in that, Includes the following steps: Step 1, intermediate shaft hoisting: Hoist the intermediate shaft onto the ship. The two ends of the intermediate shaft are supported by two adjustable rollers. Adjust the two adjustable rollers to align the two ends of the intermediate shaft with the stern shaft and crankshaft respectively. Step 2: Align the pre-drilled holes on the intermediate shaft flange end face with the pre-drilled holes on the crankshaft flange end face one by one, insert the positioning bolts and pre-tighten them, leaving a screw-in allowance on the positioning bolts, so that the two flange end faces are initially fitted together and leave room for fine adjustment, thus completing the initial alignment. Step 3: Install and calibrate the fixture: Four pre-set bolt holes are evenly distributed around the edge of the crankshaft flange end face. A lifting adjustment device is installed at the pre-set threaded hole. The four lifting adjustment devices are diagonally symmetrically arranged. The lifting adjustment device includes a mounting base. The rear end of the mounting base is screwed and fixed to the pre-set bolt holes. The mounting base is provided with a through-bolt lifting bolt. The lifting bolt is arranged radially along the crankshaft flange end face. An arc-shaped crescent plate is fixed to the bottom end of the lifting bolt. The arc-shaped crescent plate fits against the outer periphery of the intermediate shaft flange. Step 4: Set up the testing fixture: Install the corresponding dial indicator assembly around the intermediate shaft flange. The dial indicator assembly includes a dial indicator for detecting radial offset. The dial indicator is fixed to the angle steel bracket by a magnetic base. The dial indicator contact slides in contact with the outer circumferential surface of the intermediate shaft flange end. Select the crankshaft flange as the reference, make the center line of the dial indicator contact perpendicular to the axis of the crankshaft flange, and confirm the 0 position reference of the dial indicator. Step 5, Turning Test: The turning machine drives the crankshaft of the main unit to rotate, which in turn drives the intermediate shaft to rotate synchronously. The fluctuation of the dial indicator reading in the circumferential direction of the intermediate shaft flange is recorded. Step 6: Precise adjustment. Determine the high point position of the intermediate shaft flange based on the fluctuation of the dial indicator reading. Adjust the corresponding lifting bolt displacement arc crescent plate so that the arc crescent plate acts on the outer periphery of the intermediate shaft flange. Fine-tune the position of the intermediate shaft flange. Repeat steps 5 to 6 until the radial offset of the intermediate shaft flange and crankshaft flange is ≤0.03mm. Step 7, Qualification Verification: Use a 0.03mm feeler gauge to check the mating surfaces of the two flanges. After confirming that the feeler gauge cannot be inserted, tighten the fixing bolts and mark the pairing to complete the shaft alignment inspection.

2. The method for inspecting and aligning a ship's shafting system according to claim 1, characterized in that: Step 6 involves fine-tuning the intermediate shaft flange. If the highest point is directly opposite the lifting adjustment device, the corresponding lifting bolt on the corresponding side is adjusted individually. If the highest point is between two lifting adjustment devices, the lifting bolts on the adjacent sides are adjusted simultaneously.

3. The method for inspecting the alignment of a ship's shafting system according to claim 1, characterized in that: The adjustable idler roller in step 1 includes a base and a roller seat. The roller seat and the base are connected by a nut and a lead screw to adjust the height of the roller seat. A set of rollers for supporting the bottom of the intermediate shaft is installed on the top surface of the roller seat, and the roller axis is parallel to the intermediate shaft axis.

4. The method for inspecting the alignment of a ship's shafting system according to claim 3, characterized in that: The roller is made of copper.

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