A method for checking installation accuracy of a variable-pitch propeller

Abstract

The present application relates to the technical field of ship engineering, and particularly to a method for checking installation precision of a variable-pitch propeller, wherein, in a shipway installation stage, the positions of a sub-shaft body when the propeller is at a zero-pitch position, a maximum astern position and a maximum ahead position are measured, and are recorded as a first reference value, a first measured value and a second measured value in sequence; in a launching installation stage, the positions of an oil distributor when the propeller is at the zero-pitch position, the maximum astern position and the maximum ahead position are measured, and are recorded as a second reference value, a third measured value and a fourth measured value in sequence; a first calculated value is defined as a difference between the first measured value and the first reference value, a second calculated value is defined as a difference between the second measured value and the first reference value, a third calculated value is defined as a difference between the third measured value and the second reference value, and a fourth calculated value is defined as a difference between the fourth measured value and the second reference value; by comparing the first calculated value and the third calculated value, and comparing a difference between the second calculated value and the fourth calculated value, a stroke reduction of a driving shaft can be obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship engineering, in particular to a method for checking installation accuracy of a controllable pitch propeller. BACKGROUND

[0002] The controllable pitch propeller is a kind of propeller which can change the angle between the propeller hub and the blade by rotating the blade through the pitch adjusting mechanism inside the hub, so as to adjust the pitch to adapt to various working conditions. When the pitch is adjusted to the reverse position, the propulsive force generated by the propeller is opposite to the bow direction of the ship, so that the ship moves backward; when the pitch is adjusted to the zero pitch position, the propulsive force generated by the propeller is zero, and the propulsive force obtained by the ship is also zero; when the pitch is adjusted to the forward position, the propulsive force generated by the propeller is the same as the bow direction of the ship, so that the ship moves forward.

[0003] The pitch adjusting mechanism includes a hydraulic cylinder, a drive shaft, a shaft sleeve and an oil distributor, the hydraulic cylinder is arranged at one end of the propeller close to the blade and is fixedly connected with one end of the shaft sleeve, the drive shaft is slidably arranged in the shaft sleeve, one end of the drive shaft is fixedly connected with the piston of the hydraulic cylinder, the other end of the drive shaft passes through the shaft sleeve and is connected with the oil distributor through a fastener, the blade is rotatably arranged outside the shaft sleeve, a transmission mechanism for converting the axial movement of the drive shaft into the rotation of each blade is arranged between the shaft sleeve and each blade, two oil passing holes are arranged in the drive shaft, the two oil passing holes are respectively connected with the hydraulic chambers on both sides of the piston of the hydraulic cylinder, the flow direction of the hydraulic oil in the two oil passing holes is controlled by the oil distributor, the moving direction of the piston of the hydraulic cylinder can be adjusted, so as to drive the movement of the drive shaft, the movement of the drive shaft is converted into the swing of the blade through the transmission mechanism, so as to realize the adjustment of the pitch of the blade.

[0004] Due to the long length of the drive shaft, the drive shaft is usually in a multi-section structure, that is, the drive shaft is connected by a plurality of shorter sub-shaft bodies, during the ship building process, a part of the sub-shaft bodies are usually assembled at the berth stage, and the remaining sub-shaft bodies and the oil distributor are installed after the ship is launched. The inventor has found through research that after the ship is launched, the sub-shaft bodies and the sub-shaft body installation process are affected by the assembly error, which may cause the movement of the drive shaft to be stuck, resulting in that the movement stroke of the drive shaft after installation is smaller than the movement stroke of the sub-shaft body at the berth stage, which will cause the pitch adjustment range of the controllable pitch propeller to be reduced, and the pitch adjustment capacity of the controllable pitch propeller cannot be fully utilized, therefore, a method for checking the installation accuracy of the controllable pitch propeller is needed to check whether the installation accuracy of the remaining part of the drive shaft after the ship is launched is qualified. SUMMARY

[0005] The purpose of the present application is to provide a method for checking the installation accuracy of a controllable pitch propeller, which comprises the following steps:

[0006] In the stage of installation on the shipbuilding berth, the measuring device is used to measure the position of the end of the sub-shaft body away from the propeller in the axial direction of the propeller when the propeller is in the zero pitch position, the maximum astern position and the maximum ahead position, which are recorded as the first reference value, the first measured value and the second measured value respectively;

[0007] In the stage of installation on the shipbuilding berth, the measuring device is used to measure the position of the end of the sub-shaft body away from the propeller in the axial direction of the propeller when the propeller is in the zero pitch position, the maximum astern position and the maximum ahead position, which are recorded as the first reference value, the first measured value and the second measured value respectively;

[0008] The difference between the first measured value and the first reference value is defined as the first calculated value, the difference between the second measured value and the first reference value is defined as the second calculated value, the difference between the third measured value and the second reference value is defined as the third calculated value, and the difference between the fourth measured value and the second reference value is defined as the fourth calculated value. The first calculated value and the third calculated value are compared, and the difference between the second calculated value and the fourth calculated value is compared.

[0009] As a preferred solution, the measuring device comprises a connecting frame, a scale and a measuring rod. The first end of the connecting frame is used for detachable connection with the ship body, the scale is connected to the second end of the connecting frame, and the measuring rod is movably connected to the scale along the length direction of the scale.

[0010] In the stage of installation on the shipbuilding berth, the first end of the connecting frame is connected to the ship body, so that the scale is parallel or coaxial with the axial direction of the propeller. The measuring rod is moved so that the extended end of the measuring rod abuts against the end of the sub-shaft body, and the scale value corresponding to the non-extended end of the measuring rod is read to obtain the first reference value, the first measured value and the second measured value.

[0011] In the stage of installation on the shipbuilding berth, the first end of the connecting frame is connected to the ship body, so that the scale is parallel or coaxial with the axial direction of the propeller. The measuring rod is moved so that the extended end of the measuring rod abuts against the end of the sub-shaft body, and the scale value corresponding to the non-extended end of the measuring rod is read to obtain the first reference value, the first measured value and the second measured value.

[0012] As a preferred solution, the middle part of the scale has a zero scale, and the scale value of the scale gradually increases from the position of the zero scale to both ends of the scale.

[0013] In the stage of shipyard installation, after adjusting the propeller to the zero pitch position, the extension length of the measuring rod is adjusted so that the non-extension end of the measuring rod is aligned with the zero scale, the connecting frame is moved so that the extension end of the measuring rod abuts against the end of the sub-shaft body, and then the connecting frame is connected to the ship body; after adjusting the propeller to the maximum astern position, the measuring rod is moved so that the extension end of the measuring rod abuts against the end of the sub-shaft body, and the scale value corresponding to the non-extension end of the measuring rod is taken as the first calculation value; after adjusting the propeller to the maximum ahead position, the measuring rod is moved so that the extension end of the measuring rod abuts against the end of the sub-shaft body, and the scale value corresponding to the non-extension end of the measuring rod is taken as the second calculation value.

[0014] In the stage of shipyard installation, after adjusting the propeller to the zero pitch position, the extension length of the measuring rod is adjusted so that the non-extension end of the measuring rod is aligned with the zero scale, the connecting frame is moved so that the extension end of the measuring rod abuts against the end of the sub-shaft body, and then the connecting frame is connected to the ship body; after adjusting the propeller to the maximum astern position, the measuring rod is moved so that the extension end of the measuring rod abuts against the end of the sub-shaft body, and the scale value corresponding to the non-extension end of the measuring rod is taken as the first calculation value; after adjusting the propeller to the maximum ahead position, the measuring rod is moved so that the extension end of the measuring rod abuts against the end of the sub-shaft body, and the scale value corresponding to the non-extension end of the measuring rod is taken as the second calculation value.

[0015] As a preferred solution, the length direction of the scale is provided with a first marking member and a second marking member which are movable along the length direction of the scale, the first marking member is provided with a first marking line, and the first marking member is connected with a first locking mechanism for locking itself on the scale, the second marking member is provided with a second marking line, and the second marking member is connected with a second locking mechanism for locking itself on the scale.

[0016] In the stage of shipyard installation, after adjusting the propeller to the maximum astern position, the measuring rod is moved so that the extension end of the measuring rod abuts against the end of the sub-shaft body, the first marking member is moved so that the first marking line is aligned with the non-extension end of the measuring rod, and the first marking member is locked on the scale through the first locking mechanism; after adjusting the propeller to the maximum ahead position, the measuring rod is moved so that the extension end of the measuring rod abuts against the end of the sub-shaft body, the second marking member is moved so that the second marking line is aligned with the non-extension end of the measuring rod, and the second marking member is locked on the scale through the second locking mechanism.

[0017] As a preferred solution, the scale is provided with a guide rail arranged along the length direction of the scale, the first marking member is provided with a first sliding groove, the second marking member is provided with a second sliding groove, and the guide rail is arranged in the first sliding groove and the second sliding groove.

[0018] The first locking mechanism comprises a first threaded hole arranged in the groove wall of the first sliding groove and a first locking screw arranged in the first threaded hole.

[0019] The second locking mechanism comprises a second threaded hole arranged in the groove wall of the second sliding groove and a second locking screw arranged in the second threaded hole.

[0020] As a preferred solution, the first sliding groove and the second sliding groove are both T-shaped grooves, and the guide rail is a T-shaped guide rail.

[0021] As a preferred solution, the connecting frame comprises a connecting frame body and a magnetic seat connected to the first end of the connecting frame body, and the scale is connected to the second end of the connecting frame body.

[0022] As a preferred solution, the connecting frame body is a universal adjusting frame.

[0023] As a preferred solution, the measuring scale is provided with a limiting groove arranged along the length direction of the measuring scale, and the measuring rod is slidingly arranged in the limiting groove.

[0024] As a preferred solution, the middle part of the measuring rod is provided with a push-pull part.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The installation precision verification method of the variable-pitch propeller of the application, in the stage of the shipway installation, uses the measuring device to measure the position of the end of the sub-shaft body far from the propeller in the axial direction of the propeller when the propeller is in the zero-pitch position, the maximum astern position and the maximum ahead position, which are recorded as the first reference value, the first measured value and the second measured value in turn; in the stage of the underwater installation, uses the measuring device to measure the position of the end of the oil distributor far from the propeller in the axial direction of the propeller when the propeller is in the zero-pitch position, the maximum astern position and the maximum ahead position, which are recorded as the second reference value, the third measured value and the fourth measured value in turn; defines the difference between the first measured value and the first reference value as the first calculated value, the difference between the second measured value and the first reference value as the second calculated value, the difference between the third measured value and the second reference value as the third calculated value, and the difference between the fourth measured value and the second reference value as the fourth calculated value; by comparing the first calculated value and the third calculated value and comparing the difference between the second calculated value and the fourth calculated value, it can be obtained whether the moving stroke of the driving shaft is reduced after the underwater installation, the stroke reduction of the driving shaft at the maximum ahead position and the maximum astern position is known, and then the installation precision of the variable-pitch propeller is known, and it is convenient for the operating personnel to further process the driving shaft. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The flow chart of the installation precision verification method of the variable-pitch propeller of the application;

[0028] Figure 2 The structural schematic view of the measuring device measuring the position of the sub-shaft body when the propeller is in the zero-pitch position in the stage of the shipway installation;

[0029] Figure 3 The structural schematic view of the measuring device measuring the position of the sub-shaft body when the propeller is in the maximum astern position in the stage of the shipway installation;

[0030] Figure 4 The structural schematic view of the measuring device measuring the position of the oil distributor when the propeller is in the zero-pitch position in the stage of the underwater installation;

[0031] Figure 5 The structural schematic view of the measuring device measuring the position of the oil distributor when the propeller is in the maximum astern position in the stage of the underwater installation;

[0032] Figure 6 The structural schematic view of the measuring device;

[0033] Figure 7 The structural schematic view of the measuring device; Figure 6 The local enlarged view of the position C in the measuring device;

[0034] Figure 8 The connection structure schematic view of the first identification member and the scale;

[0035] Figure 9 is a front view of the first identification member;

[0036] In the figure, 100, sub-shaft body, 200, oil distributor, 1, connecting frame, 11, connecting frame body, 12, magnetic seat, 2, scale, 21, guide rail, 3, measuring rod, 31, push-pull part, 41, first identification member, 411, first identification line, 412, first sliding groove, 413, first locking screw, 42, second identification member. DETAILED DESCRIPTION

[0037] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0038] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. It should be understood that the terms "first", "second", etc. are used to describe various information in the present application, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, the "first" information can also be referred to as "second" information, and similarly, the "second" information can also be referred to as "first" information without departing from the scope of the present application.

[0039] As Figures 1 to 9 shown, the preferred embodiment of the adjustable pitch propeller installation precision verification method of the present application comprises the following steps:

[0040] In the berth installation stage, the measuring device is used to measure the position of the end of the sub-shaft body 100 away from the one end of the propeller in the propeller axial direction when the propeller is in the zero pitch position, in the maximum reverse position and in the maximum forward position, which are recorded as the first reference value, the first measured value and the second measured value in turn;

[0041] In the launching installation stage, the measuring device is used to measure the position of the end of the oil distributor 200 away from the one end of the propeller in the propeller axial direction when the propeller is in the zero pitch position, in the maximum reverse position and in the maximum forward position, which are recorded as the second reference value, the third measured value and the fourth measured value in turn;

[0042] The difference between the first measurement value and the first reference value is defined as a first calculation value, the difference between the second measurement value and the first reference value is defined as a second calculation value, the difference between the third measurement value and the second reference value is defined as a third calculation value, and the difference between the fourth measurement value and the second reference value is defined as a fourth calculation value; the first calculation value and the third calculation value are compared, and the difference between the second calculation value and the fourth calculation value is compared.

[0043] Specifically, by comparing the first calculation value and the third calculation value, it can be known whether the moving stroke of the drive shaft at the maximum reverse position is reduced after the ship is launched and installed, by comparing the second calculation value and the fourth calculation value, it can be known whether the moving stroke of the drive shaft at the maximum forward position is reduced after the ship is launched and installed, and then the installation precision of the adjustable pitch propeller can be known, and the reduction amount of the drive shaft at the maximum reverse position is known, which is convenient for the operator to further process the drive shaft.

[0044] The measuring device comprises a connecting frame 1, a scale 2 and a measuring rod 3. The first end of the connecting frame 1 is used for detachably connecting a ship body, the scale 2 is connected to the second end of the connecting frame 1, and the measuring rod 3 is movably connected to the scale 2 along the length direction of the scale 2. In the stage of ship platform installation, the first end of the connecting frame 1 is connected to the ship body, so that the scale 2 is parallel or coaxial with the axial direction of the propeller. The measuring rod 3 is moved, so that the extended end of the measuring rod 3 abuts against the end of the sub-shaft body 100, and the scale value corresponding to the non-extended end of the measuring rod 3 is read to obtain the first reference value, the first measurement value and the second measurement value. In the stage of launching and installation, the first end of the connecting frame 1 is connected to the ship body, so that the scale 2 is parallel or coaxial with the axial direction of the propeller. The measuring rod 3 is moved, so that the extended end of the measuring rod 3 abuts against the end of the oil distributor 200, and the scale value corresponding to the non-extended end of the measuring rod 3 is read to obtain the second reference value, the third measurement value and the fourth measurement value.

[0045] Further, in the embodiment, the middle part of the scale 2 has a zero scale, and the scale value of the scale 2 gradually increases from the position of the zero scale to the two ends of the scale 2.

[0046] In the stage of ship platform installation, after the propeller is adjusted to the zero pitch position, the extended length of the measuring rod 3 is adjusted, so that the non-extended end of the measuring rod 3 is aligned with the zero scale. The connecting frame 1 is moved, so that the extended end of the measuring rod 3 abuts against the end of the sub-shaft body 100, and then the connecting frame 1 is connected to the ship body. After the propeller is adjusted to the maximum reverse position, the measuring rod 3 is moved, so that the extended end of the measuring rod 3 abuts against the end of the sub-shaft body 100, and the scale value corresponding to the non-extended end of the measuring rod 3 is taken as the first calculation value. After the propeller is adjusted to the maximum forward position, the measuring rod 3 is moved, so that the extended end of the measuring rod 3 abuts against the end of the sub-shaft body 100, and the scale value corresponding to the non-extended end of the measuring rod 3 is taken as the second calculation value.

[0047] In the launching installation stage, after adjusting the propeller to the zero pitch position, the extension length of the measuring rod 3 is adjusted so that the non-extension end of the measuring rod 3 is aligned with the zero scale, the connecting frame 1 is moved so that the extension end of the measuring rod 3 abuts against the end of the oil distributor 200, and then the connecting frame 1 is connected to the ship body; after adjusting the propeller to the maximum astern position, the measuring rod 3 is moved so that the extension end of the measuring rod 3 abuts against the end of the oil distributor 200, and the scale value corresponding to the non-extension end of the measuring rod 3 is taken as the third calculation value; after adjusting the propeller to the maximum ahead position, the measuring rod 3 is moved so that the extension end of the measuring rod 3 abuts against the end of the oil distributor 200, and the scale value corresponding to the non-extension end of the measuring rod 3 is taken as the fourth calculation value.

[0048] Wherein, the length direction of the scale 2 is provided with a first marking piece 41 and a second marking piece 42 which can move along the length direction of the scale 2, the first marking piece 41 is provided with a first marking line 411, and the first marking piece 41 is connected with a first locking mechanism for locking itself on the scale 2, the second marking piece 42 is provided with a second marking line, and the second marking piece 42 is connected with a second locking mechanism for locking itself on the scale 2.

[0049] In the launching installation stage, after adjusting the propeller to the zero pitch position, the extension length of the measuring rod 3 is adjusted so that the non-extension end of the measuring rod 3 is aligned with the zero scale, the connecting frame 1 is moved so that the extension end of the measuring rod 3 abuts against the end of the oil distributor 200, and then the connecting frame 1 is connected to the ship body; after adjusting the propeller to the maximum astern position, the measuring rod 3 is moved so that the extension end of the measuring rod 3 abuts against the end of the oil distributor 200, and the scale value corresponding to the non-extension end of the measuring rod 3 is taken as the third calculation value; after adjusting the propeller to the maximum ahead position, the measuring rod 3 is moved so that the extension end of the measuring rod 3 abuts against the end of the oil distributor 200, and the scale value corresponding to the non-extension end of the measuring rod 3 is taken as the fourth calculation value.

[0050] The first marking piece 41 and the second marking piece 42 are arranged so that the measurement result of the measuring device is more intuitive, and the first calculation value and the second calculation value do not need to be recorded in the shipbuilding stage.

[0051] Specifically, the scale 2 is provided with a guide rail 21 arranged along the length direction of the scale 2, the first marking member 41 has a first sliding groove 412, the second marking member 42 has a second sliding groove, and the guide rail 21 is arranged in the first sliding groove 412 and the second sliding groove; the first locking mechanism comprises a first threaded hole arranged in the groove wall of the first sliding groove 412 and a first locking screw 413 arranged in the first threaded hole; and the second locking mechanism comprises a second threaded hole arranged in the groove wall of the second sliding groove and a second locking screw arranged in the second threaded hole. By loosening the first locking screw 413, the threaded end of the first locking screw 413 is separated from the guide rail 21 to release the locking of the first marking member 41, and by tightening the first locking screw 413, the threaded end of the first locking screw 413 abuts against the outside of the guide rail 21 to lock the first marking member 41 on the guide rail 21.

[0052] In the embodiment, the first sliding groove 412 and the second sliding groove are both T-shaped grooves, and the guide rail 21 is a T-shaped guide rail 21. In other embodiments of the present application, the first sliding groove 412 and the second sliding groove can be dovetail grooves.

[0053] In order to facilitate the connection of the connecting frame 1 to the ship body, in the embodiment, the connecting frame 1 comprises a connecting frame body 11 and a magnetic suction seat 12 connected to the first end of the connecting frame body 11, and the scale 2 is connected to the second end of the connecting frame body 11. After the measurement in the shipbuilding stage is completed, the magnetic suction switch of the magnetic suction seat 12 is turned off, the magnetic suction seat 12 is removed from the ship body, after the oil distributor 200 is installed after the ship body is launched, the magnetic suction seat 12 is placed at another position of the ship body, the position of the magnetic suction seat 12 is adjusted so that the measuring rod 3 abuts against the end of the oil distributor, then the magnetic suction switch of the magnetic suction seat 12 is turned on, and the magnetic suction seat 12 is fixed on the ship body.

[0054] In order to facilitate the adjustment of the position of the measuring rod 3 and the measuring scale, in the embodiment, the connecting frame body 11 is a universal adjusting frame. Specifically, the universal adjusting frame comprises a plurality of lockable joint shafts, which are similar to simple mechanical hands.

[0055] In order to ensure the stable sliding of the measuring rod 3, in the embodiment, the measuring scale is provided with a limiting groove arranged along the length direction of the measuring scale, and the measuring rod 3 is slidingly arranged in the limiting groove.

[0056] In order to facilitate the pushing and pulling of the measuring rod 3, in the embodiment, the middle part of the measuring rod 3 has a pushing and pulling part 31, and in the embodiment, the pushing and pulling part 31 is a protruding block protruding outwardly from the measuring rod 3.

[0057] In summary, the adjustable pitch propeller installation precision checking method of the present application, in the stage of shipway installation, uses the measuring device to measure the position of the end of the sub-shaft body 100 far away from the one end of the propeller in the axial direction of the propeller when the propeller is in the zero pitch position, the maximum reverse position and the maximum forward position, which are recorded as the first reference value, the first measured value and the second measured value in turn; in the stage of launching installation, uses the measuring device to measure the position of the end of the oil distributor 200 far away from the one end of the propeller in the axial direction of the propeller when the propeller is in the zero pitch position, the maximum reverse position and the maximum forward position, which are recorded as the second reference value, the third measured value and the fourth measured value in turn; defines the difference between the first measured value and the first reference value as the first calculated value, the difference between the second measured value and the first reference value as the second calculated value, the difference between the third measured value and the second reference value as the third calculated value, and the difference between the fourth measured value and the second reference value as the fourth calculated value; by comparing the difference between the first calculated value and the third calculated value, and the difference between the second calculated value and the fourth calculated value, it can be obtained whether the moving stroke of the drive shaft is reduced after launching installation, and the stroke reduction amount of the drive shaft at the maximum forward position and the maximum reverse position is known, and then the installation precision of the adjustable pitch propeller is known, and it is convenient for the operator to further process the drive shaft.

[0058] The above is only the preferred embodiment of the present application, and it should be noted that for ordinary skilled in the art, without departing from the technical principles of the present application, several improvements and replacements can be made, and these improvements and replacements should be considered as the protection scope of the present application.

Claims

1. A method for checking installation accuracy of a variable-pitch propeller, characterized by, The method comprises the following steps: In the stage of shipbuilding, the position of the end of the propeller shaft (100) away from the propeller in the axial direction of the propeller is measured by a measuring device when the propeller is in the zero pitch position, the maximum reverse position and the maximum forward position, which are recorded as the first reference value, the first measured value and the second measured value respectively; In the stage of launching, the position of the end of the oil distributor (200) away from the propeller in the axial direction of the propeller is measured by a measuring device when the propeller is in the zero pitch position, the maximum reverse position and the maximum forward position, which are recorded as the second reference value, the third measured value and the fourth measured value respectively; The difference between the first measured value and the first reference value is defined as the first calculated value, the difference between the second measured value and the first reference value is defined as the second calculated value, the difference between the third measured value and the second reference value is defined as the third calculated value, and the difference between the fourth measured value and the second reference value is defined as the fourth calculated value; the first calculated value and the third calculated value are compared, and the difference between the second calculated value and the fourth calculated value is compared.

2. The method of claim 1, wherein The measuring device comprises a connecting frame (1), a scale (2) and a measuring rod (3), the first end of the connecting frame (1) is used for detachable connection with the ship body, the scale (2) is connected to the second end of the connecting frame (1), and the measuring rod (3) is movably connected to the scale (2) in the length direction of the scale (2); In the stage of shipbuilding, the first end of the connecting frame (1) is connected to the ship body, so that the scale (2) is parallel or coaxial with the axial direction of the propeller; the measuring rod (3) is moved so that the extended end of the measuring rod (3) abuts against the end of the propeller shaft (100), and the scale value corresponding to the non-extended end of the measuring rod (3) is read to obtain the first reference value, the first measured value and the second measured value; In the stage of launching, the first end of the connecting frame (1) is connected to the ship body, so that the scale (2) is parallel or coaxial with the axial direction of the propeller; the measuring rod (3) is moved so that the extended end of the measuring rod (3) abuts against the end of the oil distributor (200), and the scale value corresponding to the non-extended end of the measuring rod (3) is read to obtain the second reference value, the third measured value and the fourth measured value.

3. The method of claim 2, wherein The middle part of the scale (2) has a zero scale, and the scale value of the scale (2) gradually increases from the position of the zero scale to the two ends of the scale (2); In the stage of installing the ship, after adjusting the propeller to the zero pitch position, the extension length of the measuring rod (3) is adjusted so that the non-extension end of the measuring rod (3) is aligned with the zero scale, the connecting frame (1) is moved so that the extension end of the measuring rod (3) abuts against the end of the sub-shaft body (100), and then the connecting frame (1) is connected to the ship body; after adjusting the propeller to the maximum astern position, the measuring rod (3) is moved so that the extension end of the measuring rod (3) abuts against the end of the sub-shaft body (100), and the scale value corresponding to the non-extension end of the measuring rod (3) is taken as the first calculation value; after adjusting the propeller to the maximum ahead position, the measuring rod (3) is moved so that the extension end of the measuring rod (3) abuts against the end of the sub-shaft body (100), and the scale value corresponding to the non-extension end of the measuring rod (3) is taken as the second calculation value; In the stage of installing the ship, after adjusting the propeller to the zero pitch position, the extension length of the measuring rod (3) is adjusted so that the non-extension end of the measuring rod (3) is aligned with the zero scale, the connecting frame (1) is moved so that the extension end of the measuring rod (3) abuts against the end of the sub-shaft body (100), and then the connecting frame (1) is connected to the ship body; after adjusting the propeller to the maximum astern position, the measuring rod (3) is moved so that the extension end of the measuring rod (3) abuts against the end of the sub-shaft body (100), and the scale value corresponding to the non-extension end of the measuring rod (3) is taken as the first calculation value; after adjusting the propeller to the maximum ahead position, the measuring rod (3) is moved so that the extension end of the measuring rod (3) abuts against the end of the sub-shaft body (100), and the scale value corresponding to the non-extension end of the measuring rod (3) is taken as the second calculation value; 4. The method of claim 3, wherein The length direction of the scale (2) is provided with a first marking piece (41) and a second marking piece (42) which can move along the length direction of the scale (2), the first marking piece (41) is provided with a first marking line (411), and the first marking piece (41) is connected with a first locking mechanism for locking the first marking piece (41) on the scale (2), the second marking piece (42) is provided with a second marking line, and the second marking piece (42) is connected with a second locking mechanism for locking the second marking piece (42) on the scale (2). In the berth installation stage, after adjusting the propeller to the maximum astern position, the measuring rod (3) is moved so that the extended end of the measuring rod (3) abuts against the end of the sub-shaft body (100), the first identification element (41) is moved to align the first identification line (411) with the non-extended end of the measuring rod (3), and the first identification element (41) is locked on the scale (2) through the first locking mechanism; after adjusting the propeller to the maximum ahead position, the measuring rod (3) is moved so that the extended end of the measuring rod (3) abuts against the end of the sub-shaft body (100), the second identification element (42) is moved to align the second identification line with the non-extended end of the measuring rod (3), and the second identification element (42) is locked on the scale (2) through the second locking mechanism.

5. The method of claim 4, wherein, The scale (2) is provided with a guide rail (21) arranged along the length direction of the scale (2), the first identification element (41) has a first sliding groove (412), and the second identification element (42) has a second sliding groove, and the guide rail (21) is arranged in the first sliding groove (412) and the second sliding groove; The first locking mechanism comprises a first threaded hole arranged in the groove wall of the first sliding groove (412) and a first locking screw (413) installed in the first threaded hole; The second locking mechanism comprises a second threaded hole arranged in the groove wall of the second sliding groove and a second locking screw installed in the second threaded hole.

6. The method of claim 5, wherein, The first sliding groove (412) and the second sliding groove are T-shaped grooves, and the guide rail (21) is a T-shaped guide rail (21).

7. The method of claim 2, wherein, The connecting frame (1) comprises a connecting frame body (11) and a magnetic seat (12) connected to the first end of the connecting frame body (11), and the scale (2) is connected to the second end of the connecting frame body (11).

8. The method of claim 7, wherein, The connecting frame body (11) is a universal adjusting frame.

9. The method of claim 2, wherein, The scale (2) is provided with a limiting groove arranged along the length direction of the measuring rod (3), and the measuring rod (3) is slidingly arranged in the limiting groove.

10. The method of claim 2, wherein, The middle part of the measuring rod (3) has a push-pull part (31).

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