Adjustable pitch propeller installation precision verification method

Abstract

The invention relates to the technical field of ship engineering, in particular to an adjustable pitch propeller installation precision verification method, which comprises the following steps: in a slipway installation stage, measuring the positions of a sub-shaft body when a propeller is in a zero pitch position, a maximum reversing position and a maximum forward parking position, and sequentially recording the positions as a first reference value, a first measurement value and a second measurement value; in the launching installation stage, the positions of the oil distributor when the propeller is located at the zero pitch position, the maximum reversing position and the maximum forward parking position are measured and are sequentially marked as a second reference value, a third measurement value and a fourth measurement value; defining a difference value between the first measurement value and the first reference value as a first calculation value, a difference value between the second measurement value and the first reference value as a second calculation value, a difference value between the third measurement value and the second reference value as a third calculation value, and a difference value between the fourth measurement value and the second reference value as a fourth calculation value; the stroke reduction amount of the driving shaft can be obtained by comparing the first calculation value with the third calculation value and comparing the second calculation value with the fourth calculation value.

Description

Technical Field

[0001] The invention relates to the technical field of ship engineering, and in particular to a method for calibrating the installation accuracy of an adjustable pitch propeller. Background Art

[0002] An adjustable pitch propeller is a propeller that rotates the blades through the pitch adjustment mechanism built into the hub, so that the angle between the blades and the hub changes, and the pitch is adjusted to adapt to various working conditions. When the pitch is adjusted to the reverse position, the propulsion force generated by the propeller is opposite to the bow direction of the ship, causing the ship to move backward; when the pitch is adjusted to the zero pitch position, the propulsion force generated by the propeller is zero, and the propulsion force obtained by the ship is also zero; when the pitch is adjusted to the forward position, the propulsion force generated by the propeller is the same as the bow direction of the ship, causing the ship to move forward.

[0003] The pitch adjustment mechanism includes a hydraulic cylinder, a drive shaft, a bushing and an oil distributor. The hydraulic cylinder is arranged at one end of the propeller close to the blade and is fixedly connected to one end of the bushing. The drive shaft is slidably inserted into the bushing. One end of the drive shaft is fixedly connected to the piston of the hydraulic cylinder. The other end of the drive shaft passes through the bushing and is connected to the oil distributor through a fastener. The blade is rotatably mounted on the outside of the bushing. A transmission mechanism for converting the axial movement of the propeller drive shaft into the rotation of each blade is provided between the bushing and each blade. Two oil holes are provided at intervals in the drive shaft. The two oil holes are respectively connected to the hydraulic chambers of the hydraulic cylinder on both sides of the piston. The flow direction of the hydraulic oil in the two oil holes is controlled by the oil distributor, so that the movement direction of the piston of the hydraulic cylinder can be adjusted, thereby driving the drive shaft to move. The movement of the drive shaft is converted into the swing of the blade through the transmission mechanism, thereby realizing the adjustment of the blade pitch.

[0004] Due to the long length of the drive shaft, the drive shaft mostly adopts a multi-section structure, that is, the drive shaft is connected by multiple shorter sub-shafts. During the shipbuilding process, a part of the sub-shafts are often assembled at the slipway stage, and the remaining sub-shafts and oil distributors are installed after the ship is launched. After research, the inventor found that after the ship is launched, the sub-shafts and the sub-shafts are affected by the assembly errors during the installation process, which may cause the movement of the drive shaft to be stuck, resulting in the movement stroke of the drive shaft after installation being smaller than the movement stroke of the sub-shafts at the slipway stage. This will cause the pitch adjustment range of the adjustable pitch propeller to be reduced, and the pitch adjustment ability of the adjustable pitch propeller cannot be fully utilized. Therefore, a method for verifying the installation accuracy of an adjustable pitch propeller is provided to verify whether the installation accuracy of the remaining part of the drive shaft after the ship is launched is qualified. Summary of the invention

[0005] The object of the present invention is to provide a method for calibrating the installation accuracy of an adjustable pitch propeller, comprising the following steps:

[0006] During the installation stage on the slipway, 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 reverse position and the maximum forward position is measured by using a measuring device, and the positions are recorded as the first reference value, the first measured value and the second measured value respectively;

[0007] During the launching and installation stage, the position of the end of the oil distributor away from the propeller in the axial direction of the propeller when the propeller is at the zero pitch position, the maximum reverse position and the maximum forward position is measured by using a measuring device, and the positions are recorded as the second reference value, the third measured value and the fourth measured value respectively;

[0008] Define the difference between the first measurement value and the first reference value as a first calculated value, the difference between the second measurement value and the first reference value as a second calculated value, the difference between the third measurement value and the second reference value as a third calculated value, and the difference between the fourth measurement value and the second reference value as a fourth calculated value; compare the first calculated value and the third calculated value, and compare the difference between the second calculated value and the fourth calculated value.

[0009] As a preferred solution, the measuring device comprises a connecting frame, a scale and a measuring rod, wherein the first end of the connecting frame is used for detachably connecting to the hull, 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] During the installation phase of the slipway, the first end of the connecting frame is connected to the hull 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 measurement value and the second measurement value;

[0011] During the launching and installation phase, the first end of the connecting frame is connected to the hull so that the scale is parallel or coaxial with the axis of the propeller; the measuring rod is moved so that the extended end of the measuring rod abuts against the end of the oil distributor, and the scale value corresponding to the non-extended end of the measuring rod is read to obtain the second reference value, the third measurement value and the fourth measurement value.

[0012] As a preferred solution, the middle of the scale has a zero scale, and the scale values ​​of the scale gradually increase from the position of the zero scale to the two ends of the scale;

[0013] During the installation stage on the slipway, after adjusting the propeller to the zero pitch position, adjust the extended length of the measuring rod so that the non-extended end of the measuring rod is aligned with the zero scale, move the connecting frame so that the extended end of the measuring rod abuts against the end of the sub-axis body, and then connect the connecting frame to the hull; after adjusting the propeller to the maximum reverse position, move the measuring rod so that the extended end of the measuring rod abuts against the end of the sub-axis body, and the scale value corresponding to the non-extended end of the measuring rod is used as the first calculated value; after adjusting the propeller to the maximum forward position, move the measuring rod so that the extended end of the measuring rod abuts against the end of the sub-axis body, and the scale value corresponding to the non-extended end of the measuring rod is used as the second calculated value;

[0014] During the launching and installation stage, after adjusting the propeller to the zero pitch position, adjust the extended length of the measuring rod so that the non-extended end of the measuring rod is aligned with the zero scale, move the connecting frame so that the extended end of the measuring rod abuts against the end of the oil distributor, and then connect the connecting frame to the hull; after adjusting the propeller to the maximum reverse position, move the measuring rod so that the extended end of the measuring rod abuts against the end of the oil distributor, and the scale value corresponding to the non-extended end of the measuring rod is used as the third calculated value; after adjusting the propeller to the maximum forward position, move the measuring rod so that the extended end of the measuring rod abuts against the end of the oil distributor, and the scale value corresponding to the non-extended end of the measuring rod is used as the fourth calculated value.

[0015] As a preferred solution, the length direction of the scale is provided with a first identification member and a second identification member that can move along the length direction of the scale, the first identification member is provided with a first identification line, and the first identification member is connected to a first locking mechanism for locking itself on the scale, the second identification member is provided with a second identification line, and the second identification member is connected to a second locking mechanism for locking itself on the scale;

[0016] During the slipway installation stage, after adjusting the propeller to the maximum reverse position, move the measuring rod so that the extended end of the measuring rod abuts against the end of the sub-axis, move the first identification member so that the first identification line is aligned with the non-extended end of the measuring rod, and lock the first identification member on the scale by a first locking mechanism; after adjusting the propeller to the maximum forward position, move the measuring rod so that the extended end of the measuring rod abuts against the end of the sub-axis, move the second identification member so that the second identification line is aligned with the non-extended end of the measuring rod, and lock the second identification member on the scale by a 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 identification member has a first slide groove, the second identification member has a second slide groove, and the guide rail is arranged in the first slide groove and the second slide groove;

[0018] The first locking mechanism comprises a first threaded hole arranged in the slot wall of the first sliding slot and a first locking screw installed in the first threaded hole;

[0019] The second locking mechanism includes a second threaded hole arranged in a slot wall of the second sliding slot and a second locking screw installed in the second threaded hole.

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

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

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

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

[0024] As a preferred solution, the middle portion of the measuring rod has a push-pull portion.

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

[0026] The method for calibrating the installation accuracy of an adjustable pitch propeller of the present invention comprises the following steps: in the stage of installation on the slipway, a 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, in the maximum reverse position, and in the maximum forward position, and the positions are recorded as the first reference value, the first measurement value, and the second measurement value in sequence; in the stage of installation on the water, a measuring device is used to measure the position of the end of the oil distributor away from the propeller in the axial direction of the propeller when the propeller is in the zero pitch position, in the maximum reverse position, and in the maximum forward position, and the positions are recorded as the second reference value, the third measurement value, and the fourth measurement value in sequence. ; Define the difference between the first measurement value and the first reference value as the first calculation value, the difference between the second measurement value and the first reference value as the second calculation value, the difference between the third measurement value and the second reference value as the third calculation value, and the difference between the fourth measurement value and the second reference value as the fourth calculation value; by comparing the difference between the first calculation value and the third calculation value, and comparing the difference between the second calculation value and the fourth calculation value, it can be concluded whether the moving stroke of the drive shaft is reduced after launching and installation, and the amount of reduction in the stroke of the drive shaft at the maximum forward position and the maximum reverse position can be known, thereby knowing the installation accuracy of the adjustable pitch propeller, and facilitating the operator to further process the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of the method for checking the installation accuracy of an adjustable pitch propeller of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the measuring device measuring the position of the sub-shaft body when the propeller is in the zero pitch position during the ship installation stage;

[0029] Figure 3 This is a schematic diagram of the structure of the measuring device measuring the position of the sub-shaft body when the propeller is in the maximum reverse position during the ship installation stage;

[0030] Figure 4 This is a schematic diagram of the structure of the measuring device measuring the position of the propeller when the propeller is at the zero pitch position during the underwater installation stage;

[0031] Figure 5 This is a schematic diagram of the structure of the measuring device measuring the position of the oil distributor when the propeller is in the maximum reverse position during the underwater installation stage;

[0032] Figure 6 is a schematic diagram of the structure of the measuring device;

[0033] Figure 7 for Figure 6 A partial enlarged view of point C in the middle;

[0034] Figure 8 is a schematic diagram of the connection structure between the first identification member and the scale;

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

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

[0037] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0039] like Figures 1 to 9 As shown, a preferred embodiment of the adjustable pitch propeller installation accuracy calibration method of the present invention comprises the following steps:

[0040] During the installation stage on the slipway, the position of the end of the sub-shaft body 100 away from 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 is measured by using a measuring device, and the positions are recorded as the first reference value, the first measured value and the second measured value respectively;

[0041] During the launching and installation stage, the position of the end of the oil distributor 200 away from the propeller in the axial direction of the propeller when the propeller is at the zero pitch position, the maximum reverse position and the maximum forward position is measured by using a measuring device, and these are recorded as the second reference value, the third measured value and the fourth measured value respectively;

[0042] Define the difference between the first measurement value and the first reference value as the first calculated value, the difference between the second measurement value and the first reference value as the second calculated value, the difference between the third measurement value and the second reference value as the third calculated value, and the difference between the fourth measurement value and the second reference value as the fourth calculated value; compare the first calculated value and the third calculated value, and compare the difference between the second calculated value and the fourth calculated value.

[0043] Specifically, by comparing the first calculated value with the third calculated value, it can be known whether the moving stroke of the drive shaft in the maximum reverse position is reduced after launching and installation; by comparing the second calculated value with the fourth calculated value, it can be known whether the moving stroke of the drive shaft in the maximum forward position is reduced after launching and installation, and then the installation accuracy of the adjustable pitch propeller can be known, and the reduction amount of the drive shaft in the maximum reverse position can be known, which is convenient for the operating personnel to further process the drive shaft.

[0044] Wherein, the measuring device includes 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 to the hull, 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 slipway installation stage, the first end of the connecting frame 1 is connected to the hull 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 the end of the sub-axis 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 launching installation stage, the first end of the connecting frame 1 is connected to the hull 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 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] Furthermore, in this embodiment, the middle of the scale 2 has a zero scale, and the scale values ​​of the scale 2 gradually increase from the position of the zero scale to the two ends of the scale 2;

[0046] During the installation stage on the slipway, after adjusting the propeller to the zero pitch position, adjust the extended length of the measuring rod 3 so that the non-extended end of the measuring rod 3 is aligned with the zero scale, move the connecting frame 1 so that the extended end of the measuring rod 3 abuts against the end of the sub-axis body 100, and then connect the connecting frame 1 to the hull; after adjusting the propeller to the maximum reverse position, move the measuring rod 3 so that the extended end of the measuring rod 3 abuts against the end of the sub-axis body 100, and the scale value corresponding to the non-extended end of the measuring rod 3 is used as the first calculated value; after adjusting the propeller to the maximum forward position, move the measuring rod 3 so that the extended end of the measuring rod 3 abuts against the end of the sub-axis body 100, and the scale value corresponding to the non-extended end of the measuring rod 3 is used as the second calculated value;

[0047] During the launching and installation stage, 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, and the connecting frame 1 is moved so that the extended 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 hull; 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 oil distributor 200, and the scale value corresponding to the non-extended end of the measuring rod 3 is used as the third calculated 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 oil distributor 200, and the scale value corresponding to the non-extended end of the measuring rod 3 is used as the fourth calculated value.

[0048] The invention is characterized in that a first identification member 41 and a second identification member 42 which can move along the length direction of the scale 2 are provided in the length direction of the scale 2, the first identification member 41 is provided with a first identification line 411, and the first identification member 41 is connected to a first locking mechanism for locking itself on the scale 2, the second identification member 42 is provided with a second identification line, and the second identification member 42 is connected to a second locking mechanism for locking itself on the scale 2;

[0049] During the slipway installation stage, after adjusting the propeller to the maximum reverse position, move the measuring rod 3 so that the extended end of the measuring rod 3 abuts against the end of the sub-axis 100, move the first identification member 41 so that the first identification line 411 is aligned with the non-extended end of the measuring rod 3, and lock the first identification member 41 on the scale 2 by the first locking mechanism; after adjusting the propeller to the maximum forward position, move the measuring rod 3 so that the extended end of the measuring rod 3 abuts against the end of the sub-axis 100, move the second identification member 42 so that the second identification line is aligned with the non-extended end of the measuring rod 3, and lock the second identification member 42 on the scale 2 by the second locking mechanism.

[0050] The provision of the first identification member 41 and the second identification member 42 makes the measurement result of the measuring device more intuitive, and there is no need to record the first calculated value and the second calculated value during the slipway stage.

[0051] Specifically, the scale 2 is provided with a guide rail 21 arranged along the length direction of the scale 2, the first identification member 41 has a first slide groove 412, the second identification member 42 has a second slide groove, and the guide rail 21 is inserted into the first slide groove 412 and the second slide groove; the first locking mechanism includes a first threaded hole arranged in the groove wall of the first slide groove 412 and a first locking screw 413 installed in the first threaded hole; the second locking mechanism includes a second threaded hole arranged in the groove wall of the second slide groove and a second locking screw installed in the second threaded hole. By loosening the first locking screw 413, the threaded end of the first locking screw 413 is out of contact with the guide rail 21, and the locking of the first identification member 41 can be released. By tightening the first locking screw 413, the threaded end of the first locking screw 413 is abutted against the outer side of the guide rail 21, and the first identification member 41 can be locked on the guide rail 21.

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

[0053] In order to facilitate connecting the connecting frame 1 to the hull, in this embodiment, the connecting frame 1 includes 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. After the measurement of the slipway stage is completed, the magnetic switch of the magnetic seat 12 is turned off, and the magnetic seat 12 is removed from the hull. After the hull is launched and the oil dispenser 200 is installed, the magnetic seat 12 is placed at another position on the hull, and the position of the magnetic seat 12 is adjusted so that the measuring rod 3 abuts against the end of the dispenser, and then the magnetic switch of the magnetic seat 12 is turned on, and the magnetic seat 12 is fixed to the hull.

[0054] In order to facilitate the adjustment of the positions of the measuring rod 3 and the measuring ruler, in this embodiment, the connecting frame body 11 is a universal adjustment frame. Specifically, the universal adjustment frame includes a plurality of lockable joint axes, similar to a simple manipulator.

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

[0056] To facilitate pushing and pulling the measuring rod 3 , in this embodiment, a push-pull portion 31 is provided in the middle of the measuring rod 3 . In this embodiment, the push-pull portion 31 is a convex block protruding outward from the measuring rod 3 .

[0057] In summary, the method for calibrating the installation accuracy of an adjustable pitch propeller of the present invention is to use a measuring device to measure the position of the end of the sub-shaft body 100 away from 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, and record them as the first reference value, the first measurement value and the second measurement value in sequence; 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 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, and record them as the second reference value, the third measurement value and the third measurement value in sequence. Four measurement values; define the difference between the first measurement value and the first reference value as the first calculated value, the difference between the second measurement value and the first reference value as the second calculated value, the difference between the third measurement value and the second reference value as the third calculated value, and the difference between the fourth measurement 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 comparing the difference between the second calculated value and the fourth calculated value, it can be concluded whether the moving stroke of the drive shaft is reduced after launching and installation, and the amount of reduction in the stroke of the drive shaft at the maximum forward position and the maximum reverse position can be known, thereby knowing the installation accuracy of the adjustable pitch propeller, and facilitating the operator to further process the drive shaft.

[0058] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for checking the installation accuracy of an adjustable pitch propeller, characterized in that: The following steps are involved: During the installation stage on the slipway, a measuring device is used to measure the position of the end of the sub-shaft body (100) away from 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, and the positions are recorded as a first reference value, a first measured value and a second measured value in sequence; During the launching and installation stage, a measuring device is used to measure the position of the end of the oil distributor (200) away from the propeller in the axial direction of the propeller when the propeller is at the zero pitch position, the maximum reverse position and the maximum forward position, and the positions are recorded as the second reference value, the third measurement value and the fourth measurement value respectively; Define the difference between the first measurement value and the first reference value as a first calculated value, the difference between the second measurement value and the first reference value as a second calculated value, the difference between the third measurement value and the second reference value as a third calculated value, and the difference between the fourth measurement value and the second reference value as a fourth calculated value; compare the first calculated value and the third calculated value, and compare the difference between the second calculated value and the fourth calculated value.

2. The method for calibrating the installation accuracy of an adjustable pitch propeller according to claim 1, characterized in that: 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 to a hull, 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); During the installation phase on the slipway, the first end of the connecting frame (1) is connected to the hull so that the scale (2) is parallel to 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; During the launching and installation phase, the first end of the connecting frame (1) is connected to the hull so that the scale (2) is parallel to or coaxial with the axis 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.

3. The method for calibrating the installation accuracy of an adjustable pitch propeller according to claim 2, characterized in that: The middle of the scale (2) has a zero scale, and the scale values ​​of the scale (2) gradually increase from the position of the zero scale to the two ends of the scale (2); During the installation stage on the slipway, after adjusting the propeller 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, and the connecting frame (1) is moved so that the extended end of the measuring rod (3) abuts against the end of the sub-axis body (100), and then the connecting frame (1) is connected to the hull; after adjusting the propeller 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-axis body (100), and the scale value corresponding to the non-extended end of the measuring rod (3) is used as the first calculated value; after adjusting the propeller 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-axis body (100), and the scale value corresponding to the non-extended end of the measuring rod (3) is used as the second calculated value; During the launching and installation phase, 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 oil distributor (200), and then the connecting frame (1) is connected to the hull; 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 oil distributor (200), and the scale value corresponding to the non-extended end of the measuring rod (3) is used as the third calculated 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 oil distributor (200), and the scale value corresponding to the non-extended end of the measuring rod (3) is used as the fourth calculated value.

4. The method for calibrating the installation accuracy of an adjustable pitch propeller according to claim 3, characterized in that: The scale (2) is provided with a first identification member (41) and a second identification member (42) movable along the length direction of the scale (2); the first identification member (41) is provided with a first identification line (411), and the first identification member (41) is connected to a first locking mechanism for locking the first identification member on the scale (2); the second identification member (42) is provided with a second identification line, and the second identification member (42) is connected to a second locking mechanism for locking the first identification member on the scale (2); During the installation stage on the slipway, after adjusting the propeller 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-axis (100), the first identification member (41) is moved so that the first identification line (411) is aligned with the non-extended end of the measuring rod (3), and the first identification member (41) is locked on the scale (2) by a first locking mechanism; after adjusting the propeller 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-axis (100), the second identification member (42) is moved so that the second identification line is aligned with the non-extended end of the measuring rod (3), and the second identification member (42) is locked on the scale (2) by a second locking mechanism.

5. The method for calibrating the installation accuracy of an adjustable pitch propeller according to claim 4, characterized in that: The scale (2) is provided with a guide rail (21) arranged along the length direction of the scale (2); the first identification member (41) has a first slide groove (412); the second identification member (42) has a second slide groove; and the guide rail (21) is inserted into the first slide groove (412) and the second slide 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 includes a second threaded hole arranged in a slot wall of the second sliding slot and a second locking screw installed in the second threaded hole.

6. The method for calibrating the installation accuracy of an adjustable pitch propeller according to claim 5, characterized in that: 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).

7. The method for calibrating the installation accuracy of an adjustable pitch propeller according to claim 2, characterized in that: The connecting frame (1) comprises a connecting frame body (11) and a magnetic seat (12) connected to a first end of the connecting frame body (11); the scale (2) is connected to a second end of the connecting frame body (11).

8. The method for calibrating the installation accuracy of an adjustable pitch propeller according to claim 7, characterized in that: The connecting frame body (11) is a universal adjustment frame.

9. The method for calibrating the installation accuracy of an adjustable pitch propeller according to claim 2, characterized in that: The measuring ruler is provided with a limiting groove arranged along the length direction of the measuring ruler, and the measuring rod (3) is slidably arranged in the limiting groove.

10. The method for calibrating the installation accuracy of an adjustable pitch propeller according to claim 2, characterized in that: The middle part of the measuring rod (3) is provided with a push-pull part (31).

Images