Tool and method for checking pitch feedback synchronism of ship controllable-pitch propeller

Abstract

The invention discloses a ship controllable-pitch propeller pitch feedback synchronism inspection tool which is used for being connected with a ship controllable-pitch propeller and an oil distributor to inspect pitch feedback synchronism and comprises a drawing cover plate, a drawing screw rod, a first drawing nut, a second drawing nut, a first dial indicator and a second dial indicator. A first through hole is formed in the drawing cover plate, the drawing lead screw extends into an oil cylinder of the controllable-pitch propeller to be connected with a piston, the first dial indicator is installed on the oil cylinder of the controllable-pitch propeller, a pointer of the first dial indicator extends into the oil cylinder of the controllable-pitch propeller to be connected with the piston, and the second dial indicator is installed on the oil distributor. And a pointer of the second dial indicator is connected with the oil pressing movable end of the oil distributor. The ship controllable-pitch propeller pitch feedback synchronism inspection method can inspect the ship controllable-pitch propeller pitch feedback synchronism in the ship building stage, and avoids the situation that a ship needs to be docked or go up to check and solve the problem due to the fact that problems are found in the sailing test stage, and the invention further provides a ship controllable-pitch propeller pitch feedback synchronism inspection method.

Description

Technical Field

[0001] The invention belongs to the field of shipbuilding, and in particular relates to a tool and method for checking the synchronicity of pitch feedback of a ship's adjustable pitch propeller. Background Art

[0002] In order to adapt to the multiple working conditions of ships and the large difference in propulsion loads, ship propulsion generally adopts adjustable pitch propeller propulsion. The pitch change principle of the adjustable pitch propeller is: the oil distributor introduces the high-pressure oil generated by the hydraulic system into the high-pressure chamber of the hub, drives the piston to drive the blade to rotate, adjusts the blade angle to change the blade pitch, and the blade pitch receives mechanical feedback through the pitch transmitter set on the oil distributor and converts it into a feedback electrical signal input into the electronic control system for pitch feedback and control; whether the actual pitch of the underwater propeller can be synchronously fed back to the electronic control system directly affects whether the adjustable pitch propeller device can work normally and affects the navigation performance of the ship; the current inspection method is: use oil pressure to drive the hub piston to drive the axial movement of the oil pipe in the shaft, and use the oil distributor feedback device assembly for mechanical display and electrical feedback of the pitch, and determine the synchronization of the mechanical feedback of the adjustable pitch propeller pitch by checking the consistency between the hub blade scale and the oil distributor pitch mechanical indication. This inspection method cannot detect the obstruction of the oil pipe in the shaft, which causes the pitch distortion of the mechanical display of the oil distributor and the pitch transmitter feedback to the electronic control system. There is currently no suitable method to detect the synchronization of pitch feedback during the ship construction phase. Therefore, when a problem is found, for example, the output power deviation of the adjustable pitch propeller set in the symmetrical shaft system causes the ship to automatically turn and deviate when it is moving straight. At this time, the ship is often in the navigation test stage and can only be solved by docking or inspecting the ship, which is difficult and costly. Therefore, in order to avoid the shortcomings of the existing technology, it is necessary to improve the existing technology. Summary of the invention

[0003] The purpose of the present invention is to provide a ship's adjustable pitch propeller pitch feedback synchronization inspection tool, which can check the ship's adjustable pitch propeller pitch feedback synchronization during the ship construction stage, so as to avoid problems being discovered during the navigation test stage, which requires the ship to be docked or put on the dock for inspection and resolution. The present invention also proposes a ship's adjustable pitch propeller pitch feedback synchronization inspection method.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] A ship pitch propeller pitch feedback synchronization inspection tool is used to be connected to the ship's pitch propeller and oil distributor respectively, including a drawing cover plate, a drawing screw rod, a first drawing nut, a second drawing nut, a first dial indicator and a second dial indicator, the drawing cover plate is installed on the oil cylinder of the adjustable pitch propeller, a first through hole is opened on the drawing cover plate, the drawing screw rod passes through the first through hole and extends into the oil cylinder of the adjustable pitch propeller and is connected to the piston, the first drawing nut is connected to the drawing screw rod on the side of the drawing cover plate close to the oil cylinder, the second drawing nut is connected to the drawing screw rod on the side of the drawing cover plate away from the oil cylinder, the first dial indicator is installed on the oil cylinder of the adjustable pitch propeller, the needle of the first dial indicator extends into the oil cylinder of the adjustable pitch propeller and is connected to the piston, the second dial indicator is installed on the oil distributor, and the needle of the second dial indicator is connected to the oil pressure active end of the oil distributor.

[0006] As a preferred solution of the above-mentioned ship pitch feedback synchronization inspection tooling, a second screw hole is opened on the pulling cover plate, a sleeve gasket is arranged between the pulling cover plate and the oil cylinder of the adjustable pitch propeller, and a fastening bolt is arranged on the pulling cover plate. The fastening bolt passes through the second screw hole and the sleeve gasket to fix the pulling cover plate on the oil cylinder of the adjustable pitch propeller.

[0007] As a preferred solution of the above-mentioned ship pitch propeller pitch feedback synchronization inspection tooling, a plurality of second screw holes are opened, and the opening positions of the plurality of second screw holes correspond to the positions of the screw holes on the cylinder for fixing the end cover.

[0008] As a preferred solution of the above-mentioned ship controllable pitch propeller pitch feedback synchronization inspection tooling, a plurality of the second screw holes are symmetrically arranged on the upper side and the lower side of the drawing cover plate.

[0009] As a preferred solution of the above-mentioned ship pitch propeller pitch feedback synchronization inspection tooling, there are two drawing screw rods, and the two drawing screw rods are symmetrically arranged on the upper side and the lower side of the drawing cover plate.

[0010] As a preferred solution of the above-mentioned ship pitch propeller pitch feedback synchronization inspection tooling, the rod body of the drawing screw is fully threaded.

[0011] The present invention also provides a method for checking the synchronicity of pitch feedback of a ship's adjustable pitch propeller, and checking the synchronicity of pitch feedback by the above-mentioned ship's adjustable pitch propeller pitch feedback synchronicity checking tool comprises the following steps:

[0012] Step 1: Remove the end cover of the oil cylinder of the controllable pitch propeller, and remove the bolts connecting the piston and the crank inside the oil cylinder of the controllable pitch propeller;

[0013] Step 2: Screw the drawing screw into the original position of the bolt in step 1, so that the drawing screw extends into the oil cylinder of the controllable pitch propeller and connects with the piston;

[0014] Step 3: Fixedly connecting the pull-out cover plate to the oil cylinder of the controllable pitch propeller;

[0015] Step 4: Apply grease to the threaded connection between the drawing screw rod and the first drawing nut and the second drawing nut;

[0016] Step 5: Install a first dial gauge on the oil cylinder of the controllable pitch propeller, and insert the needle of the first dial gauge into the oil cylinder of the controllable pitch propeller to connect with the piston;

[0017] Step 6: Remove the cover plate of the oil distributor, install the second dial gauge on the oil distributor, and connect the needle of the second dial gauge to the oil pressure active end of the oil distributor;

[0018] Step 7: Check the forward travel synchronization, loosen the second pull-out nut, rotate the first pull-out nut counterclockwise, make the piston inside the oil cylinder move forward travel, check whether the readings of the first dial gauge and the second dial gauge are consistent, check whether the pointer of the second dial gauge jumps during the movement of the piston, if the readings of the first dial gauge and the second dial gauge are consistent and the pointer of the second dial gauge does not jump, it means that the pitch feedback synchronization is good, if the readings of the first dial gauge and the second dial gauge are inconsistent or the pointer of the second dial gauge jumps, it means that the pitch feedback synchronization is distorted and needs to be repaired;

[0019] Step 8: Check the synchronization of the reverse stroke, loosen the first pull nut, rotate the second pull nut clockwise to make the piston inside the cylinder move in the reverse stroke, check whether the readings of the first dial indicator and the second dial indicator are consistent, and check whether the pointer of the second dial indicator jumps during the movement of the piston. If the readings of the first dial indicator and the second dial indicator are consistent and the pointer of the second dial indicator does not jump, it means that the pitch feedback synchronization is good. If the readings of the first dial indicator and the second dial indicator are inconsistent or the pointer of the second dial indicator jumps, it means that the pitch feedback synchronization is distorted and needs to be repaired.

[0020] Compared with the prior art, the beneficial effects of implementing the above-mentioned ship controllable pitch propeller pitch feedback synchronization inspection tool provided by the present invention are as follows:

[0021] The pull-out cover plate of the present invention can be installed at the position of the original end cover after the end cover of the oil cylinder of the adjustable pitch propeller is removed, and is extended into the oil cylinder of the adjustable pitch propeller and connected with the piston by means of a pull-out screw rod passing through the first through hole. In this way, by twisting the first pull-out nut and the second pull-out nut, the movement direction of the piston can be adjusted so that the piston can perform forward and reverse stroke movements. The needle of the first dial gauge extends into the oil cylinder of the adjustable pitch propeller and is connected with the piston. When the piston moves, the first dial gauge can measure the movement stroke of the piston, and the needle of the second dial gauge is connected to the oil pressure movable end of the oil distributor. When the oil pressure movable end of the oil distributor moves, the needle of the first dial gauge can measure the movement stroke of the piston. The two dial indicators can measure the moving stroke of the oil pressure active end of the oil distributor. By comparing whether the readings of the first dial indicator and the second dial indicator are consistent, and observing whether the pointer of the second dial indicator jumps, the synchronization of the pitch feedback can be checked. If the readings of the first dial indicator and the second dial indicator are consistent and the pointer of the second dial indicator does not jump, it means that the synchronization of the pitch feedback is good. If the readings of the first dial indicator and the second dial indicator are inconsistent or the pointer of the second dial indicator jumps, it means that the oil pipe in the shaft may be stuck in the shaft, resulting in distortion of the synchronization of the pitch feedback, which needs to be disassembled and inspected. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0023] Figure 1 It is a schematic diagram of a ship controllable pitch propeller pitch feedback synchronization inspection tooling of the present invention;

[0024] Figure 2 It is a front schematic diagram of the pull-out cover plate of the present invention.

[0025] Markings in the figure:

[0026] 100, drawing cover plate; 110, fastening bolt; 120, sleeve gasket; 130, second screw hole; 140, first through hole; 200, drawing screw rod; 210, first drawing nut; 220, second drawing nut; 300, first dial indicator; 400, second dial indicator; 500, oil cylinder; 510, piston; 520, crank; 600, oil distributor; 700, oil pipe. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] Please also read Figure 1 to Figure 2 Now, the ship controllable pitch propeller pitch feedback synchronization inspection tooling provided in an embodiment of the present invention is described.

[0032] like Figure 1 to Figure 2 As shown, the ship pitch controllable propeller pitch feedback synchronization inspection tool of the present invention is used to be connected to the ship's pitch controllable propeller and the oil distributor 600 respectively, including a drawing cover plate 100, a drawing screw rod 200, a first drawing nut 210, a second drawing nut 220, a first dial indicator 300 and a second dial indicator 400, the drawing cover plate 100 is installed on the oil cylinder 500 of the adjustable pitch propeller, the drawing cover plate 100 is provided with a first through hole 140, the drawing screw rod 200 passes through the first through hole 140 and extends into the oil cylinder 500 of the adjustable pitch propeller and is connected to the piston 510, the first drawing nut 210 is connected to the oil cylinder 500 of the adjustable pitch propeller, and the second drawing nut 220 is connected to the oil cylinder 500 of the adjustable pitch propeller. 10 is connected to the drawing screw rod 200 on the side of the drawing cover plate 100 close to the oil cylinder 500, the second drawing nut 220 is connected to the drawing screw rod 200 on the side of the drawing cover plate 100 away from the oil cylinder 500, the first dial indicator 300 is installed on the oil cylinder 500 of the adjustable pitch propeller, the needle of the first dial indicator 300 extends into the oil cylinder 500 of the adjustable pitch propeller and is connected to the piston 510, the second dial indicator 400 is installed on the oil distributor 600, and the needle of the second dial indicator 400 is connected to the oil pressure active end of the oil distributor 600.

[0033] The drawing screw 200 is connected to the piston 510. The drawing screw 200 is adjusted by screwing the first drawing nut 210 and the second drawing nut 220 to drive the piston 510 to move. Since the piston 510 is connected to the needle of the first dial indicator 300, the movement stroke of the piston 510 will be fed back to the first dial indicator 300, and the piston 510 is connected to the inner shaft oil pipe 700. The movable end of the oil distributor 600 is driven to move by the oil pressure of the inner shaft oil pipe 700. Since the needle of the second dial indicator 400 is connected to the oil pressure movable end of the oil distributor 600, the movement stroke of the oil pressure movable end of the oil distributor 600 will be fed back to the second dial indicator 400. By comparing whether the readings of the first dial indicator 300 and the second dial indicator 400 are consistent, and observing whether the pointer of the second dial indicator 400 jumps, the synchronization of the pitch feedback is checked.

[0034] Exemplarily, a second screw hole 130 is opened on the drawing cover plate 100, a sleeve gasket 120 is arranged between the drawing cover plate 100 and the oil cylinder 500 of the adjustable pitch propeller, a fastening bolt 110 is arranged on the drawing cover plate 100, and the fastening bolt 110 passes through the second screw hole 130 and the sleeve gasket 120 to fix the drawing cover plate 100 on the oil cylinder 500 of the adjustable pitch propeller, and the sleeve gasket 120 is arranged between the drawing cover plate 100 and the oil cylinder 500 of the adjustable pitch propeller, so that the pressure of the fastening bolt 110 to tighten the drawing cover plate 100 is evenly distributed on the sleeve gasket 120, and the sleeve gasket 120 provides a flat fixing surface for the drawing cover plate 100 to be installed on the oil cylinder 500.

[0035] Exemplarily, a plurality of the second screw holes 130 are provided, and the positions of the plurality of the second screw holes 130 correspond to the positions of the screw holes on the cylinder 500 for fixing the end cover. Thus, after removing the end cover on the cylinder 500, the pull-out cover plate 100 can be installed at the position of the original end cover, which is convenient for installation.

[0036] Exemplarily, the plurality of second screw holes 130 are symmetrically arranged on the upper side and the lower side of the pull cover plate 100 . The symmetrical arrangement of the plurality of second screw holes 130 ensures that the pull cover plate 100 is subjected to balanced force after the fastening bolts 110 are tightened, and will not warp to one side.

[0037] Exemplarily, there are two drawing wire rods 200, and the two drawing wire rods 200 are symmetrically arranged on the upper and lower sides of the drawing cover plate 100. The two symmetrically arranged drawing wire rods 200 can balance the force of the piston 510 when it moves, and there will be no situation where one side is higher than the other side, thereby affecting the measurement reading of the first dial indicator 300.

[0038] Exemplarily, the rod body of the drawing screw rod 200 is fully threaded. The drawing screw rod 200 needs to replace the bolts connecting the piston 510 and the crank 520, screw into the piston 510 and the crank 520, and needs to be threadedly connected with the first drawing nut 210 and the second drawing nut 220. Therefore, the rod body of the drawing screw rod 200 is fully threaded to facilitate the threaded cooperation with the piston 510, the crank 520, the first drawing nut 210 and the second drawing nut 220.

[0039] The present invention also provides a method for checking the synchronicity of pitch feedback of a ship's adjustable pitch propeller, and checking the synchronicity of pitch feedback by the above-mentioned ship's adjustable pitch propeller pitch feedback synchronicity checking tool comprises the following steps:

[0040] Step 1: Remove the end cover of the oil cylinder 500 of the controllable pitch propeller, and remove the bolts connecting the piston 510 and the crank 520 inside the oil cylinder 500 of the controllable pitch propeller;

[0041] Step 2: Screw the drawing screw rod 200 into the original position of the bolt in step 1, so that the drawing screw rod 200 extends into the oil cylinder 500 of the controllable pitch propeller and is connected with the piston 510;

[0042] Step 3: Fixedly connecting the pulling cover plate 100 to the oil cylinder 500 of the controllable pitch propeller;

[0043] Step 4: Apply grease to the threaded connection between the drawing screw rod 200 and the first drawing nut 210 and the second drawing nut 220;

[0044] Step 5: Install the first dial gauge 300 on the oil cylinder 500 of the controllable pitch propeller, and insert the needle of the first dial gauge 300 into the oil cylinder 500 of the controllable pitch propeller to connect with the piston 510;

[0045] Step 6: Remove the cover plate of the oil distributor 600, install the second dial gauge 400 on the oil distributor 600, and connect the needle of the second dial gauge 400 to the oil pressure active end of the oil distributor 600;

[0046] Step 7: Check the synchronism of the forward travel, loosen the second pull nut 220, rotate the first pull nut 210 counterclockwise, so that the piston 510 inside the oil cylinder 500 moves the forward travel, check whether the readings of the first dial indicator 300 and the second dial indicator 400 are consistent, and check whether the pointer of the second dial indicator 400 jumps during the movement of the piston 510. If the readings of the first dial indicator 300 and the second dial indicator 400 are consistent and the pointer of the second dial indicator 400 does not jump, it means that the synchronization of the pitch feedback is good. If the readings of the first dial indicator 300 and the second dial indicator 400 are inconsistent or the pointer of the second dial indicator 400 jumps, it means that the synchronization of the pitch feedback is distorted and needs to be repaired;

[0047] Step 8: Check the synchronization of the reverse stroke, loosen the first pull nut 210, rotate the second pull nut 220 clockwise to make the piston 510 inside the cylinder 500 move in the reverse stroke, check whether the readings of the first dial indicator 300 and the second dial indicator 400 are consistent, and check whether the pointer of the second dial indicator 400 jumps during the movement of the piston 510. If the readings of the first dial indicator 300 and the second dial indicator 400 are consistent and the pointer of the second dial indicator 400 does not jump, it means that the pitch feedback synchronization is good. If the readings of the first dial indicator 300 and the second dial indicator 400 are inconsistent or the pointer of the second dial indicator 400 jumps, it means that the pitch feedback synchronization is distorted and needs to be repaired.

[0048] The method checks the pitch feedback synchronization of the ship's adjustable pitch propeller by using a ship's adjustable pitch propeller pitch feedback synchronization inspection tool, and can be used in the ship's construction phase, thereby checking the ship's adjustable pitch propeller pitch feedback synchronization, avoiding problems that are discovered during the navigation test phase and requiring the ship to be docked or put on the dock for inspection and resolution, and bringing the time point when problems can be discovered forward to the ship's construction phase, thereby reducing the cost of disassembly and inspection.

[0049] Compared with the prior art, the beneficial effects of implementing the above-mentioned ship controllable pitch propeller pitch feedback synchronization inspection tool provided by the present invention are as follows:

[0050] The pull cover plate 100 of the present invention can be installed at the position of the original end cover after the end cover of the oil cylinder 500 of the adjustable pitch propeller is removed. The pull screw rod 200 passes through the first through hole 140 and extends into the inside of the oil cylinder 500 of the adjustable pitch propeller to be connected with the piston 510. In this way, by screwing the first pull nut 210 and the second pull nut 220, the movement direction of the piston 510 can be adjusted so that the piston 510 can perform forward and reverse stroke movements. The needle of the first dial indicator 300 extends into the inside of the oil cylinder 500 of the adjustable pitch propeller and is connected with the piston 510. When the piston 510 moves, the first dial indicator 300 can measure the movement stroke of the piston 510, and the needle of the second dial indicator 400 is connected to the oil pressure active end of the oil distributor 600. The oil distributor 600 When the oil pressure movable end moves, the second dial indicator 400 can measure the moving stroke of the oil pressure movable end of the oil distributor 600. By comparing whether the readings of the first dial indicator 300 and the second dial indicator 400 are consistent, and observing whether the pointer of the second dial indicator 400 jumps, the pitch feedback synchronization is checked. If the readings of the first dial indicator 300 and the second dial indicator 400 are consistent and the pointer of the second dial indicator 400 does not jump, it means that the pitch feedback synchronization is good. If the readings of the first dial indicator 300 and the second dial indicator 400 are inconsistent or the pointer of the second dial indicator 400 jumps, it means that the inner oil pipe 700 may be stuck in the shaft, resulting in distortion of the pitch feedback synchronization, which needs to be repaired.

[0051] The above is only a preferred embodiment 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 ship pitch control propeller pitch feedback synchronization inspection tool, used to be connected to the ship's pitch control propeller and oil distributor respectively, characterized in that: It includes a drawing cover plate, a drawing screw rod, a first drawing nut, a second drawing nut, a first dial indicator and a second dial indicator; The drawing cover plate is mounted on the oil cylinder of the adjustable pitch propeller, a first through hole is formed on the drawing cover plate, the drawing screw rod passes through the first through hole and extends into the oil cylinder of the adjustable pitch propeller to be connected with the piston, the first drawing nut is connected to the drawing screw rod on a side of the drawing cover plate close to the oil cylinder, and the second drawing nut is connected to the drawing screw rod on a side of the drawing cover plate away from the oil cylinder; The first dial gauge is mounted on the oil cylinder of the controllable pitch propeller, and the needle of the first dial gauge extends into the oil cylinder of the controllable pitch propeller and is connected to the piston; The second dial gauge is installed on the oil distributor, and the needle of the second dial gauge is connected to the oil pressure active end of the oil distributor.

2. The ship controllable pitch propeller pitch feedback synchronization inspection tool according to claim 1 is characterized in that: A second screw hole is provided on the pulling cover plate, a sleeve gasket is provided between the pulling cover plate and the oil cylinder of the adjustable pitch propeller, and a fastening bolt is provided on the pulling cover plate. The fastening bolt passes through the second screw hole and the sleeve gasket to fix the pulling cover plate on the oil cylinder of the adjustable pitch propeller.

3. The ship controllable pitch propeller pitch feedback synchronization inspection tool according to claim 2 is characterized in that: A plurality of the second screw holes are provided, and the positions of the plurality of the second screw holes correspond to the positions of the screw holes on the oil cylinder for fixing the end cover.

4. The ship controllable pitch propeller pitch feedback synchronization inspection tool according to claim 3 is characterized in that: A plurality of the second screw holes are symmetrically arranged on the upper side and the lower side of the pull cover plate.

5. The ship controllable pitch propeller pitch feedback synchronization inspection tool according to claim 1, characterized in that: There are two drawing wire rods, and the two drawing wire rods are symmetrically arranged on the upper side and the lower side of the drawing cover plate.

6. The ship controllable pitch propeller pitch feedback synchronization inspection tool according to claim 5, characterized in that: The rod body of the drawing screw rod is fully threaded.

7. A method for checking the synchronization of pitch feedback of a ship's controllable pitch propeller, characterized in that: The method of checking the pitch feedback synchronization of a ship's controllable pitch propeller by using the ship's controllable pitch propeller pitch feedback synchronization checking tool as described in any one of claims 1 to 6 comprises the following steps: Step 1: Remove the end cover of the oil cylinder of the controllable pitch propeller, and remove the bolts connecting the piston and the crank inside the oil cylinder of the controllable pitch propeller; Step 2: Screw the drawing screw into the original position of the bolt in step 1, so that the drawing screw extends into the oil cylinder of the controllable pitch propeller and connects with the piston; Step 3: Fixedly connecting the pull-out cover plate to the oil cylinder of the controllable pitch propeller; Step 4: Apply grease to the threaded connection between the drawing screw rod and the first drawing nut and the second drawing nut; Step 5: Install a first dial gauge on the oil cylinder of the controllable pitch propeller, and insert the needle of the first dial gauge into the oil cylinder of the controllable pitch propeller to connect with the piston; Step 6: Remove the cover plate of the oil distributor, install the second dial gauge on the oil distributor, and connect the needle of the second dial gauge to the oil pressure active end of the oil distributor; Step 7: Check the forward travel synchronization, loosen the second pull-out nut, rotate the first pull-out nut counterclockwise, make the piston inside the oil cylinder move forward travel, check whether the readings of the first dial gauge and the second dial gauge are consistent, check whether the pointer of the second dial gauge jumps during the movement of the piston, if the readings of the first dial gauge and the second dial gauge are consistent and the pointer of the second dial gauge does not jump, it means that the pitch feedback synchronization is good, if the readings of the first dial gauge and the second dial gauge are inconsistent or the pointer of the second dial gauge jumps, it means that the pitch feedback synchronization is distorted and needs to be repaired; Step 8: Check the synchronization of the reverse stroke, loosen the first pull nut, rotate the second pull nut clockwise to make the piston inside the cylinder move in the reverse stroke, check whether the readings of the first dial indicator and the second dial indicator are consistent, and check whether the pointer of the second dial indicator jumps during the movement of the piston. If the readings of the first dial indicator and the second dial indicator are consistent and the pointer of the second dial indicator does not jump, it means that the pitch feedback synchronization is good. If the readings of the first dial indicator and the second dial indicator are inconsistent or the pointer of the second dial indicator jumps, it means that the pitch feedback synchronization is distorted and needs to be repaired.

Images