Correction device and method for ship shafting stern tube

Abstract

The present invention relates to a correction device and method for a ship shaft stern tube, wherein the correction device for a ship shaft stern tube comprises an adjustment plate, which is arranged on one side of the stern tube and close to the stern of the stern tube and can move horizontally and vertically relative to the hull; a transmitter, which is arranged on the adjustment plate and the light emitted by it can penetrate the adjustment plate; there are two reference frames, one of which is arranged between the adjustment plate and the stern of the stern tube, and the other is arranged on one side of the stern tube and close to the bow of the stern tube, and both of the two reference frames can move horizontally and vertically relative to the hull; a mounting frame, which contacts the inner side wall of the stern tube through an adjustment column, and the adjustment column can at least partially move radially relative to the stern tube; a receiver, which is installed on the mounting frame, is used to read the information of the transmitter and is connected to a terminal. The device has high measurement accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of ship installation, and in particular to a correction device and method for a stern tube of a ship shafting. Background Art

[0002] The shafting system is one of the most important parts of a ship, and its manufacturing and processing requirements are very high. The installation of the shafting system and the main engine is the key and difficult project in shipbuilding. All major shipyards are researching various processes to improve their accuracy and reduce construction difficulties to ensure the correctness of construction.

[0003] There are two methods currently used: one is the wire drawing method, which traditionally uses piano wire to draw the wire. This is a traditional process. Although the cost is low, its accuracy is affected by many factors. The measurement results rely on the workers' proficiency to ensure its accuracy, and the error is large. In addition, the piano wire has deflection, and the measurement results must be obtained through complex calculations to obtain the deviation of the stern tube center relative to the theoretical axis line, which is inefficient.

[0004] The other is the optical instrument method. The optical instrument is a laser emitted by a transmitter through the two base points of the bow and stern provided by the hull. The bull's eye is adjusted to be concentric with the center of the stern tube. The stern tube is adjusted to make the bull's eye concentric with the laser. The concentricity of the laser and the bull's eye is checked through a high-power magnifying glass. The accuracy can only reach 0.1mm. As shown in the "5000PCTC Roll-on / Roll-off Ship Shaft System Illumination Process" disclosed in the Chinese invention patent with patent number CN201210010668.5 (publication number CN102849179A), the forward base point and the rear base point are replaced with light targets with cross-marked lines, and the telescope is located behind the rear base point; an eight-legged light target stand is set in the inner hole of the stern tube, and the front and rear light targets are fixed on it, and preliminarily aligned according to the inner hole; the telescope benchmark is calibrated with the tail base point; this is repeated many times until the telescope passes The bow base point and the stern base point; adjust the light target holders of the front light target and the rear light target in the stern tube respectively, so that the centers of the two light targets coincide with the bow base point and the stern base point; check the center deviation of the stern tube inner hole according to the adjusted center positions of the front light target and the rear light target; adjust the focal length of the telescope and check the left and right centering of the bearing seat; hang a heavy hammer to check the left and right centering of the base; measure the relative position of the center line of the shaft system and the center line of the rudder system; calculate and correct the position of the bow base point and the stern base point until it meets the requirements. This lighting process requires manual observation and reading, and the measurement accuracy needs to be further improved. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a correction device for a ship shafting stern tube with high measurement accuracy in view of the current status of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a correction method for a ship shafting stern tube with high measurement accuracy in view of the current status of the prior art.

[0007] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a correction device for a ship shaft stern tube, characterized in that it includes:

[0008] An adjusting plate is arranged on one side of the stern tube and close to the stern of the stern tube, and can move laterally and vertically relative to the hull;

[0009] An emitter, which is disposed on the adjustment plate and emits light that can penetrate the adjustment plate;

[0010] There are two reference frames, one of which is arranged between the adjustment plate and the stern of the stern tube, and the other is arranged on one side of the stern tube and close to the bow of the stern tube, and both of the reference frames can move laterally and vertically relative to the hull;

[0011] a mounting frame in contact with the inner side wall of the stern tube via an adjustment column, wherein the adjustment column is at least partially movable radially relative to the stern tube;

[0012] The receiver, mounted on the mounting bracket, is used to read the information from the transmitter and connect to the terminal.

[0013] In order to adjust the adjustment plate into position, so that the transmitter is initially moved into position, that is, the position of the transmitter is roughly adjusted by moving the adjustment plate, the adjustment plate is movably connected to a frame, the frame is square, and includes two first screw rods and two second screw rods, the adjustment plate is located in the area surrounded by the first screw rods and the second screw rods, the opposite sides of the adjustment plate are movably mounted on the two first screw rods through the first nuts, and the two ends of each of the first screw rods are movably mounted on the two second screw rods through the second nuts. In this way, the adjustment plate can move horizontally (or vertically) along the first screw rod, and when the first screw rod moves along the second screw rod, the adjustment plate can move vertically (or horizontally) synchronously therewith.

[0014] In order to allow the light emitted by the emitter to pass through the adjustment plate and irradiate the downstream components (such as the reference frame), the adjustment plate is provided with a light-transmitting hole for the light emitted by the emitter to pass through. Otherwise, the adjustment plate blocks the light emitted by the emitter, which will affect the illumination and make it impossible to center and calibrate the stern tube center.

[0015] In order to make the reference point on the reference frame be located on the center line of the shaft system, each of the reference frames is in the shape of a plate, a through hole is provided at the center of the reference frame, a reference block is detachably provided in the through hole, the center of the reference block is marked with a reference point, and the reference frame is located in an area surrounded by a square frame, and the four side panels of the frame are movably provided with connecting rods that can move axially in the width direction of the corresponding side panels, and one end of each connecting rod is connected to the reference frame. In this way, two of the four connecting rods move horizontally and the other two move vertically, so that the reference frame can be driven to move horizontally left and right or vertically up and down through the axial movement of the four connecting rods.

[0016] In order to prevent the other two connecting rods from interfering with the corresponding side plates when two of the connecting rods move, the four side plates of the frame are provided with sliding grooves along their length direction for the corresponding connecting rods to slide radially, and each of the connecting rods is locked on the side plate of the corresponding side by a third nut. The setting of the sliding groove not only allows the connecting rod to move axially relative to the corresponding side plate, but also allows the connecting rod to move radially relative to the corresponding side plate, and the sliding groove can also play a certain guiding role.

[0017] In order to make the axis of the mounting frame coincide with the axis of the stern tube, the mounting frame includes a connecting shaft whose axis is parallel to or coincides with the axis of the stern tube and a target seat sleeved on the connecting shaft, the connecting shaft can rotate relative to the target seat, and a dial indicator is installed on the connecting shaft, the dial indicator is installed on the dial indicator, the adjustment column is installed on the target seat, the receiver is connected to the connecting shaft and faces the transmitter, and the receiver and the dial indicator are respectively located on both sides of the connecting shaft.

[0018] In order to reduce the friction between the connecting shaft and the center of the target and ensure the rotation accuracy, a bearing is provided between the connecting shaft and the target seat.

[0019] In order to facilitate the adjustment of the position of the mounting bracket, a slot is provided on the outer peripheral wall of the target seat, and the adjusting column includes a column seat and a column body. The column seat is installed in the slot, and the first end of the column body is threadedly connected to the column seat, and the second end is in contact with the inner wall of the stern tube, that is, the column body can move radially relative to the stern tube. In this way, by changing the position of the threaded connection between the column seat and the column body, the position of the mounting bracket relative to the stern tube is changed, so that the axis of the mounting bracket can be adjusted to coincide with the center line of the stern tube.

[0020] In order to improve the accuracy of the stern tube centerline correction, there are two mounting brackets, which are respectively arranged at the bow and stern of the stern tube, and the receiver can be detachably connected to each mounting bracket. In this way, the stern of the stern tube is corrected and measured, and the bow of the stern tube is corrected and measured. By repeatedly correcting and measuring the bow and stern, the accuracy of the stern tube centerline correction is guaranteed.

[0021] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a ship shaft stern tube correction method, characterized in that the two reference frames are respectively a bow reference frame and a stern reference frame, the two reference blocks are respectively a bow reference block installed on the bow reference frame and a stern reference block installed on the stern reference frame, the two frames are divided into a first frame and a second frame, and the correction method comprises the following steps:

[0022] A. First, install the adjustment plate, bow reference frame and stern reference frame at the preset position (wire frame), measure the center line of the shaft system of the hull by using the total station, and adjust the center of the through hole on the bow reference frame and the center of the through hole on the stern reference frame to the center line of the shaft system;

[0023] B. By adjusting the position of the adjustment plate, the light beam emitted by the transmitter passes through the area surrounded by the first frame and the second frame;

[0024] C. Install the stern reference block in the through hole of the stern reference frame, adjust the laser to coincide with the reference point on the stern reference block by using the first adjustment member of the transmitter for adjusting the displacement, then remove the stern reference block, install the bow reference block in the through hole of the bow reference frame, adjust the laser to coincide with the reference point on the bow reference block by using the second adjustment member of the transmitter for adjusting the angle, and then calibrate the coincidence of the light beam with the reference point on the stern reference block, and adjust repeatedly until the light beam coincides with the reference point on the stern reference block and the reference point on the bow reference block at the same time;

[0025] D. Use a dial indicator to adjust both mounting brackets to be concentric with the stern tube, and install the receiver on the mounting bracket at the stern of the stern tube. The receiver receives data and sends the data to the terminal. If the data is qualified, execute step E. If the data is unqualified, adjust the stern of the stern tube by adjusting the screw.

[0026] E. Remove the receiver from the mounting bracket at the stern of the stern tube and install it on the mounting bracket at the bow of the stern tube. The receiver receives data and sends data to the terminal. If the data is qualified, the calibration is completed. If the data is unqualified, adjust the bow of the stern tube by adjusting the screw. After the adjustment is completed, adjust the stern of the stern tube again. Repeat this adjustment until the bow and stern of the stern tube are adjusted in place.

[0027] Compared with the prior art, the advantages of the present invention are as follows: by providing a mounting frame in the stern tube, and by detachably installing a receiver on the mounting frame, the receiver can automatically read the data of the transmitter, thereby effectively avoiding human reading errors, and its accuracy can reach 0.001 mm, which is 100 times higher than that of traditional lighting, and is fast, convenient, and highly accurate, with low requirements on workers' skills; in addition, the adjustment plate, reference frame, mounting frame, etc. provided in the present invention can all move horizontally or vertically relative to the hull, further improving the accuracy of the stern tube centerline correction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0029] Figure 2 for Figure 1 AA section view;

[0030] Figure 3 for Figure 1 A magnified image of point A;

[0031] Figure 4 for Figure 2 A schematic diagram of the structure of the mounting frame and the adjusting column;

[0032] Figure 5 for Figure 4 Side view of

[0033] Figure 6 for Figure 1 A magnified view of point B;

[0034] Figure 7 for Figure 1 BB section view;

[0035] Figure 8 It is a side view of the bow reference frame or the stern reference frame;

[0036] Fig. 9 for Figure 6 Schematic diagram of the structure of the middle adjustment plate and the frame. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the accompanying drawings.

[0038] like Figures 1 to 9As shown, the correction device for the stern tube of the ship shafting of the preferred embodiment includes an adjustment plate 1, a transmitter 3, a reference frame 4, a mounting frame 5 and a receiver 6. The stern tube 2 is arranged on the hull 9, and a plurality of adjustment screws 91 are movably arranged on the hull 9. The heads of all the adjustment screws 91 are against the outer side wall of the stern tube 2. Some of the adjustment screws 91 are arranged corresponding to the stern of the stern tube 2 and extend along the radial direction of the stern tube 2; the other part of the adjustment screws 91 are arranged corresponding to the bow of the stern tube 2 and extend along the radial direction of the stern tube 2.

[0039] like Figure 6 , 9 As shown, the adjustment plate 1 is movably connected to a frame body 7, the frame body 7 is rectangular, and includes two first screw rods 71 ​​and two second screw rods 72 that are oppositely arranged. The adjustment plate 1 is located in the area surrounded by four screw rods (first screw rods 71 ​​and second screw rods 72). The opposite sides of the adjustment plate 1 are movably mounted on the two first screw rods 71 ​​through first nuts 711, and the two ends of each first screw rod 71 are movably mounted on the two second screw rods 72 through second nuts 712. Both ends of each second screw rod 72 are provided with connecting sleeves 721, which are installed on the first wire drawing frame 92 described below. In this embodiment, as Fig. 9 As shown, two first screw rods 71 ​​are arranged vertically, and two second screw rods 72 are arranged horizontally. The adjustment plate 1 can move vertically along the first screw rods 71, and when the first screw rod 71 moves along the second screw rod 72, the adjustment plate 1 can move horizontally synchronously therewith. The position of the launcher 3 is roughly adjusted by the movement of the adjustment plate 1, so that the launcher 3 is initially moved into position.

[0040] In addition, the adjusting plate 1 is provided with a first sleeve 12 that can be sleeved on the first screw rod 71, and the first nut 711 is connected to or integrally formed with the corresponding first sleeve 12; the first screw rod 71 is provided with a second sleeve 713 that can be sleeved on the second screw rod 72, and the second nut 712 is connected to or integrally formed with the corresponding second sleeve 713.

[0041] like Figure 1 , 3 As shown, the emitter 3 is arranged on the adjustment plate 1 and the light it emits can penetrate the adjustment plate 1. The adjustment plate 1 is provided with a light-transmitting hole 11 for the light emitted by the emitter 3 to pass through, so that the light emitted by the emitter 3 can pass through the adjustment plate 1 to illuminate the downstream components (such as the reference frame 4). Otherwise, the adjustment plate 1 blocks the light emitted by the emitter 3, which will affect the illumination and make it impossible to center and correct the center of the stern tube 2. The emitter 3 itself has a first adjustment member that can adjust the displacement (can move up and down, left and right) and a second adjustment member that can adjust the angle (can rotate up and down, left and right). In this embodiment, the emitter 3 uses the Easy-laser laser geometry measurement and shaft alignment equipment manufactured by Damalini AB of Sweden.

[0042] The reference frame 4 is in the shape of a plate, and a through hole 41 is provided at the center of the reference frame 4. A reference block 42 is detachably provided in the through hole 41. The center of the reference block 42 is marked with a reference point. The reference frame 4 is located in an area surrounded by a rectangular frame 8. The four side plates 80 of the frame 8 are movably provided with connecting rods 81 that can move axially in the width direction relative to the corresponding side plates 80. One end of each connecting rod 81 is connected to the reference frame 4. The four side plates 80 of the frame 8 are provided with sliding grooves 82 along their length direction for the corresponding connecting rods 81 to slide radially. Each connecting rod 81 is locked on the side plate 80 on the corresponding side by a third nut 83. The setting of the sliding grooves 82 not only allows the connecting rods 81 to move axially relative to the corresponding side plates 80, but also allows the connecting rods 81 to move radially relative to the corresponding side plates 80, and the sliding grooves 82 can also play a certain guiding role. In this way, among the four connecting rods 81, two of them move horizontally and the other two move vertically. The axial movement of the four connecting rods 81 can drive the reference frame 4 to move horizontally or vertically, so that the reference point on the reference frame 4 can be located on the center line of the shaft system. The connecting rod 81 can be a screw rod.

[0043] There are two reference frames 4, namely the bow reference frame 4a and the stern reference frame 4b. The bow reference frame 4a and the stern reference frame 4b have the same structure. The two reference blocks 42 are respectively the bow reference block installed on the bow reference frame 4a and the stern reference block installed on the stern reference frame 4b. The two frames are respectively the first frame corresponding to the bow reference frame 4a and the second frame corresponding to the stern reference frame 4b.

[0044] like Figure 1 As shown, in the direction from the stern to the bow of the stern tube 2, a first cable frame 92 is provided upstream of the stern tube 2, a second cable frame 93 is provided downstream of the stern tube 2, a frame body 7 and a second frame are provided on the first cable frame, the frame body 7 and the second frame are respectively located on the opposite sides of the first cable frame 92, and the first frame is provided on the second cable frame 93. In other words, the adjustment plate 1 is provided at one side of the stern tube 2 and close to the stern of the stern tube 2, and the adjustment plate 1 can move horizontally and vertically relative to the hull 9; the stern reference frame 4b is provided between the adjustment plate 1 and the stern of the stern tube 2, the bow reference frame 4a is provided at one side of the stern tube 2 and close to the bow of the stern tube 2, and both the stern reference frame 4b and the bow reference frame 4a can move horizontally and vertically relative to the hull 9.

[0045] There are two mounting brackets 5 , which are respectively arranged at the bow and stern of the stern tube 2 . Each mounting bracket 5 is in contact with the inner wall of the stern tube 2 through an adjusting column 54 , and the adjusting column 54 can move radially relative to the stern tube 2 .

[0046] Each mounting frame 5 includes a connecting shaft 51 whose axis is parallel to or coincides with the axis of the stern tube 2 and a target seat 52 sleeved on the connecting shaft 51. The connecting shaft 51 is hollow inside and can rotate relative to the target seat 52. A bearing 55 is provided between the connecting shaft 51 and the target seat 52. A gauge rod 53 extending radially along the stern tube 2 is installed on the connecting shaft 51, a dial indicator is installed on the gauge rod 53, an adjustment column 54 is installed on the target seat 52, a receiver 6 is inserted into the connecting shaft 51 and faces the transmitter 3, and the receiver 6 and the gauge rod 53 are respectively located on both sides of the connecting shaft 51.

[0047] A slot 521 is provided on the outer peripheral wall of the target base 52. The adjustment column 54 includes a column seat 541 and a column body 542. The column seat 541 is installed in the slot 521. The first end of the column body 542 is threadedly connected to the column seat 541, and the second end is against the inner wall of the stern tube 2.

[0048] In this way, by changing the position of the threaded connection between the column seat 541 and the column body 542, the position of the mounting bracket 5 relative to the stern tube 2 is changed, so that the axis of the mounting bracket 5 can be adjusted to coincide with the center line of the stern tube 2. When adjusting the center of the connecting shaft 51 to coincide with the center of the stern tube 2, the connecting shaft 51 is rotated to drive the dial indicator to move up, down, left, and right for detection, so as to determine whether the center of the connecting shaft 51 coincides with the center of the stern tube 2, that is, the axis of the connecting shaft 51 of the mounting bracket 5 and the axis of the stern tube 2 are adjusted to coincide through the detection of the dial indicator.

[0049] The receiver 6 can be detachably connected to each mounting bracket 5, that is, the receiver 6 can be installed on the mounting bracket 5 located at the stern or the mounting bracket 5 located at the bow. The receiver 6 is used to read the information of the transmitter 3 and connect to the terminal to send data to the terminal. In this embodiment, the terminal is a computer, and the connection between the receiver 6 and the terminal is a communication connection. The technology of the communication connection is existing technology and will not be repeated here.

[0050] The ship shafting stern tube 2 correction method of this embodiment includes the following steps:

[0051] A. First, the adjustment plate 1, the bow reference frame 4a and the stern reference frame 4b are all installed in the preset positions, and the center line of the shaft system of the hull 9 is measured by a total station (measuring the center line of the shaft system is a prior art, and reference can be made to patent CN201210392014.3 "A method for illuminating and centering the axis of a ship using a total station"), and the center of the through hole 41 on the bow reference frame 4a and the center of the through hole 41 on the stern reference frame 4b are both adjusted to the center line of the shaft system;

[0052] B. By adjusting the position of the adjustment plate 1, the light beam emitted by the transmitter 3 passes through the area surrounded by the first frame and the second frame;

[0053] C. Install the stern reference block in the through hole 41 of the stern reference frame 4b, adjust the laser to coincide with the reference point on the stern reference block by using the first adjustment member for adjusting the displacement of the transmitter 3, then remove the stern reference block, install the bow reference block in the through hole 41 on the bow reference frame 4a, adjust the laser to coincide with the reference point on the bow reference block by using the second adjustment member for adjusting the angle of the transmitter 3, then calibrate the coincidence of the light beam with the reference point on the stern reference block, and adjust repeatedly in this way until the light beam coincides with the reference points on the stern reference block and the reference points on the bow reference block at the same time; (the reason why the stern is adjusted by displacement and the bow is adjusted by angle is because the bow is farther away from the transmitter 3, and it is easier to obtain a larger distance adjustment through the angle; in addition, the bow reference block can be installed all the time, and the stern reference block must be removed when adjusting the bow, otherwise the light beam cannot pass).

[0054] D. Use a dial indicator to adjust the two mounting brackets 5 to be concentric with the stern tube 2, and install the receiver 6 on the mounting bracket 5 located at the stern of the stern tube 2. The receiver 6 receives data and sends the data to the terminal. If the data is qualified, execute step E. If the data is unqualified, adjust the stern of the stern tube 2 through the adjustment screw 91 located at the stern of the stern tube 2.

[0055] E. Remove the receiver 6 from the mounting bracket 5 located at the stern of the stern tube 2 and install it on the mounting bracket 5 located at the bow of the stern tube 2. The receiver 6 receives data and sends data to the terminal. If the data is qualified, the calibration is completed. If the data is unqualified, the bow of the stern tube 2 is adjusted by the adjustment screw 91 located at the bow of the stern tube 2. After the adjustment is completed, the stern of the stern tube 2 is adjusted again. The adjustment is repeated until the bow and stern of the stern tube 2 are adjusted in place. Specifically, the receiver 6 receives a data at 0 degrees, and then rotates 180 degrees with the connecting shaft 51 to receive a data, and feeds the data back to the computer. After the technical personnel judge, if the data is within the error range, the stern tube 2 is adjusted in place. If the data is not within the error range, the stern tube 2 needs to be adjusted further.

Claims

1. A ship shaft stern tube correction device, characterized in that: include An adjusting plate (1) is arranged on one side of the stern tube (2) and close to the stern of the stern tube (2), and can move laterally and vertically relative to the hull (9); An emitter (3) is disposed on the adjustment plate (1) and emits light that can penetrate the adjustment plate (1); There are two reference frames (4), one of which is arranged between the adjustment plate (1) and the stern of the stern tube (2), and the other is arranged on one side of the stern tube (2) and close to the bow of the stern tube (2), and the two reference frames (4) can move horizontally and vertically relative to the hull (9); A mounting frame (5) is in contact with the inner wall of the stern tube (2) via an adjustment column (54), wherein the adjustment column (54) is at least partially movable in a radial direction relative to the stern tube (2); A receiver (6), mounted on the mounting frame (5), is used to read the information of the transmitter (3) and connect to the terminal; Each of the reference frames (4) is in the shape of a plate, a through hole (41) is provided at the center of the reference frame (4), a reference block (42) is detachably provided in the through hole (41), a reference point is marked at the center of the reference block (42), and the reference frame (4) is located in an area surrounded by a square frame (8), and connecting rods (81) that can move axially in the width direction of the corresponding side plates (80) are movably penetrated on the four side plates (80) of the frame (8), and one end of each of the connecting rods (81) is connected to the reference frame (4) accordingly; The mounting frame (5) comprises a connecting shaft (51) whose axis is parallel to or coincides with the axis of the stern tube (2) and a target seat (52) sleeved on the connecting shaft (51); the connecting shaft (51) can rotate relative to the target seat (52); a dial indicator (53) is mounted on the connecting shaft (51); a dial indicator is mounted on the dial indicator (53); the adjusting column (54) is mounted on the target seat (52); the receiver (6) is connected to the connecting shaft (51) and faces the transmitter (3); the receiver (6) and the dial indicator (53) are respectively located on both sides of the connecting shaft (51); There are two mounting frames (5), which are respectively arranged at the bow and stern of the stern tube (2), and the receiver (6) can be detachably connected to each mounting frame (5).

2. The ship shafting stern tube correction device according to claim 1, characterized in that: The adjusting plate (1) is movably connected to a frame (7); the frame (7) is square and comprises two first screw rods (71) arranged opposite to each other and two second screw rods (72) arranged opposite to each other; the adjusting plate (1) is located in an area surrounded by the first screw rods (71) and the second screw rods (72); the two sides of the adjusting plate (1) are movably mounted on the two first screw rods (71) through first nuts (711), and the two ends of each first screw rod (71) are movably mounted on the two second screw rods (72) through second nuts (712).

3. The ship shafting stern tube correction device according to claim 1, characterized in that: The adjustment plate (1) is provided with a light-transmitting hole (11) for light emitted by the emitter (3) to pass through.

4. The ship shafting stern tube correction device according to claim 1, characterized in that: The four side plates (80) of the frame (8) are provided with sliding grooves (82) along their length direction for the corresponding connecting rods (81) to slide radially, and each connecting rod (81) is locked on the side plate (80) on the corresponding side by a third nut (83).

5. The ship shafting stern tube correction device according to claim 1, characterized in that: A bearing (55) is provided between the connecting shaft (51) and the target seat (52).

6. The ship shafting stern tube correction device according to claim 1, characterized in that: A slot (521) is provided on the outer peripheral wall of the target seat (52); the adjusting column (54) comprises a column seat (541) and a column body (542); the column seat (541) is installed in the slot (521); a first end of the column body (542) is threadedly connected to the column seat (541), and a second end can contact the inner wall of the stern tube (2).

7. A correction method for a ship shafting stern tube correction device using the device of claim 1, characterized in that: The two reference frames (4) are respectively a bow reference frame (4a) and a stern reference frame (4b); the two reference blocks are respectively a bow reference block mounted on the bow reference frame (4a) and a stern reference block mounted on the stern reference frame (4b); the two frames are respectively a first frame and a second frame; the calibration method comprises the following steps: A. First, the adjustment plate (1), the bow reference frame (4a) and the stern reference frame (4b) are all installed at preset positions, the center line of the shaft system of the hull (9) is measured by a total station, and the center of the through hole (41) on the bow reference frame (4a) and the center of the through hole (41) on the stern reference frame (4b) are adjusted to the center line of the shaft system; B. adjusting the position of the adjustment plate (1) so that the light beam emitted by the transmitter (3) passes through the area enclosed by the first frame and the second frame; C. Install a stern reference block in the through hole (41) of the stern reference frame (4b), adjust the laser to coincide with the reference point on the stern reference block by using the first adjustment member for adjusting the displacement of the transmitter (3), then remove the stern reference block, install the bow reference block in the through hole (41) on the bow reference frame (4a), adjust the laser to coincide with the reference point on the bow reference block by using the second adjustment member for adjusting the angle of the transmitter (3), and then calibrate the coincidence of the light beam with the reference point on the stern reference block. Repeat the adjustment until the light beam coincides with both the reference point on the stern reference block and the reference point on the bow reference block. D. Using a dial indicator, adjust the axes of the connecting shafts (51) of the two mounting brackets (5) to be concentric with the stern tube (2), and mount the receiver (6) on the mounting bracket (5) located at the stern of the stern tube (2). The receiver (6) receives data and sends the data to the terminal. If the data is qualified, execute step E. If the data is unqualified, adjust the stern of the stern tube (2) using the adjustment screw (91) located at the stern of the stern tube (2); E. Remove the receiver (6) from the mounting bracket (5) located at the stern of the stern tube (2) and mount it on the mounting bracket (5) located at the bow of the stern tube (2). The receiver (6) receives data and sends the data to the terminal. If the data is qualified, the calibration is completed. If the data is unqualified, the bow of the stern tube (2) is adjusted by the adjustment screw (91) at the bow of the stern tube (2). After the adjustment is completed, the stern of the stern tube (2) is adjusted again. The adjustment is repeated until the bow and stern of the stern tube (2) are adjusted in place.

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